Title of Invention	A SHAVING DEVICE WITH A PIVOTABLE SHAVING HEAD
Abstract	The invention relates to a device (1) for shaving hairs growing from skin (27). The device comprises a base portion (3) having a grip (5). The device further comprises a shaving head (7) which carries at least one cutting member (9,11) having at least one cutting edge (13,15). The device has an actuator (35) for effecting a periodical motion (P) of the cutting member relative to the base portion in order to improve the cutting action of the cutting member. According to the invention, the shaving head (7) is pivotable relative to the base portion (3) about a pivot axis (25), and the periodical motion (P) of the cutting member (9,11) is a periodical motion relative to the shaving head. As a result, the position and orientation of the shaving head relative to the skin (27) are less dependent on the manner in which the user holds the device (1) in his hand and positions the device relative to the skin. In this manner, the position and orientation of the geometrical path of the periodical motion of the cutting member relative to the skin is well-defined, so that the risk of skin irritations and skin injuries is considerably reduced.

Title of Invention

A SHAVING DEVICE WITH A PIVOTABLE SHAVING HEAD

Abstract

The invention relates to a device (1) for shaving hairs growing from skin (27). The device comprises a base portion (3) having a grip (5). The device further comprises a shaving head (7) which carries at least one cutting member (9,11) having at least one cutting edge (13,15). The device has an actuator (35) for effecting a periodical motion (P) of the cutting member relative to the base portion in order to improve the cutting action of the cutting member. According to the invention, the shaving head (7) is pivotable relative to the base portion (3) about a pivot axis (25), and the periodical motion (P) of the cutting member (9,11) is a periodical motion relative to the shaving head. As a result, the position and orientation of the shaving head relative to the skin (27) are less dependent on the manner in which the user holds the device (1) in his hand and positions the device relative to the skin. In this manner, the position and orientation of the geometrical path of the periodical motion of the cutting member relative to the skin is well-defined, so that the risk of skin irritations and skin injuries is considerably reduced.

Full Text	A shaving device with a pivotable shaving head carrying an actively driven cutting member The invention relates to a device for shaving hairs growing from skin, comprising a base portion having a grip, a shaving head carrying at least one blade-shaped cutting member having at least one cutting edge, and an actuator for effecting a periodical motion of the cutting member relative to the base portion. The invention also relates to a shaving head suitable for use in a device for shaving hairs growing from skin, the shaving head carrying at least one blade-shaped cutting member having at least one cutting edge, the shaving head further comprising a coupling member by means of which the shaving head can be coupled to a base portion of said device, said base portion comprising a grip and an actuator for effecting a periodical motion of the cutting member relative to the base portion. A device for shaving hairs of the kind mentioned in the opening paragraphs is known from US-A-2,054,418. The shaving head of the known device comprises a blade-shaped cutting member. The actuator of the known device comprises an electric motor, which is arranged in the base portion and has a shaft to which a flywheel is eccentrically secured. The flywheel is located in the shaving head of the known device and extends substantially parallel to the main surfaces of the cutting member. The shaft is supported by two bearings, one of which is also arranged in the shaving head. During operation, when the flywheel is rotated by the motor, the flywheel exerts periodical forces on the bearings. Via the bearing arranged in the shaving head, said forces are transmitted to the shaving head and effect a circular periodical motion of the shaving head and of the cutting member mounted therein relative to the base portion. The circular periodical motion of the cutting member takes place substantially in an imaginary plane parallel to the main surfaces of the cutting member. As a result of said periodical motion of the cutting member, the device has an improved hair cutting action. A disadvantage of the known device for shaving hairs is that the risk of skin irritations and skin injuries is considerably increased as a result of the periodical motion of the cutting member. It is an object of the invention to provide a device for shaving hairs and a shaving head of the kinds mentioned in the opening paragraphs which have an improved hair cutting action as a result of the periodical motion of the blade-shaped cutting member, but which have a smaller risk of skin irritations and skin injuries. In order to achieve said object, a device for shaving hairs in accordance with the invention is characterized in that the shaving head is pivotable relative to the base portion about a pivot axis, and the periodical motion of the cutting member is a periodical motion relative to the shaving head. In order to achieve said object, a shaving head in accordance with the invention is characterized in that the periodical motion of the cutting member is a periodical motion relative to the shaving head, and the shaving head comprises a pivot member by . means of which, in a condition where the shaving head is mounted to the base portion, the shaving head is pivotable relative to the base portion about a pivot axis. The invention is based on the insight that, for a shaving device wherein the blade-shaped cutting member performs a periodical motion, the risk of skin irritations and skin injuries is considerably reduced if the geometrical path, which is followed by the cutting member during the periodical motion, has a well-defined position and orientation with respect to the skin surface. Since in accordance with the invention the shaving head is pivotable relative to the base portion, the position and orientation of said geometrical path are less dependent on, or even independent of, the position and orientation of the base portion with respect to the skin surface, so that the position and orientation of said geometrical path are less dependent on the manner in which the user holds the grip in his hand and holds his hand with respect to the skin surface. As a result of said pivot axis, the position and orientation of said geometrical path are mainly determined by the contact forces between the shaving head and the skin surface. Said contact forces lead to a pivotal motion of the shaving head about the pivot axis into a position, in which the shaving head is in optimum contact with the skin and in which, accordingly, the geometrical path of the cutting member has a well-defined position and orientation with respect to the skin surface. Since, in addition, the periodical motion of the cutting member is a periodical motion relative to the shaving head, the shaving head is stationary with respect to the base portion apart from pivotal motions about said pivot axis. As a result, the position and orientation of the geometrical path of the periodical motion of the cutting member relative to the skin are even better defined. A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the shaving head comprises a skin contact member defining a skin contact surface, the pivot axis extending substantially parallel to the skin contact surface. As a result, the shaving head has a further improved skin-contour following ability, so that the position and orientation of the geometrical path of the periodical motion of the cutting member with respect to the skin surface are even better defined and the risk of skin irritations and skin injuries is further reduced. A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the periodical motion has a motion component which extends substantially parallel to a main cutting direction of the cutting member, the pivot axis extending substantially perpendicularly to the main cutting direction. The hair cutting action of the device is considerably improved as a result of said motion component extending parallel to the main cutting direction, and said orientation of the pivot axis perpendicular to the main cutting direction, i.e. parallel to said motion component, provides an optimum skin-contour following ability of the shaving head having said motion component. A further embodiment of a device for shaving hairs in accordance with the invention is characterized in that the periodical motion is a reciprocating motion in a direction substantially parallel to the main cutting direction. The hair cutting action of the device is further improved as a result of said reciprocating motion in said direction substantially parallel to the main cutting direction. A further embodiment of a device for shaving hairs in accordance with the invention is characterized in that the cutting member comprises a single straight cutting edge, the pivot axis extending parallel to the cutting edge and, seen in the main cutting direction, being arranged in front of the cutting edge. In this manner, for a shaving head with a blade-shaped cutting member having a single straight cutting edge, it is achieved that the contact pressure between the cutting edge of the cutting member and the skin is less dependent on the force with which the user presses the shaving head on the skin. As a result, the shaving performance and the shaving comfort of the device are less dependent on said force exerted by the user. A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the device further comprises a pretensioning member which defines a skin contact pressure exerted by the cutting member on the skin during operation. As a result of said pretensioning member, it is achieved that the contact pressure between the cutting edge of the cutting member and the skin is less dependent on the force with which the user presses the shaving head on the skin. As a result, the shaving performance and the shaving comfort of the device are less dependent on said force exerted by the user. A further embodiment of a device for shaving hairs in accordance with the invention is characterized in that the pretensioning member comprises a mechanical spring mounted to the shaving head and to the base portion for exerting a pretensioning mechanical torque on the shaving head about the pivot axis. In this embodiment, the pretensioning member has a simple, practical and effective structure. A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the actuator is arranged in the base portion and effects the periodical motion of the cutting member via a transmission system which is partially arranged in the base portion and partially arranged in the shaving head. In this manner, the structure of the shaving head is simplified and the dimensions of the shaving head are considerably reduced. As a result, the shaving head is particularly suitable to be constructed as a detachable shaving head, which can be removed from the base portion and exchanged by a new shaving head when the cutting member is worn out. A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the shaving head is releasably mounted to the base portion. In this embodiment, the shaving head can be removed from the base portion and exchanged by a new shaving head when the cutting member is worn out. A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the cutting member is releasably mounted to the shaving head. In this embodiment, the cutting member can be removed from the shaving head and exchanged by a new cutting member when the cutting member is worn out. In one preferred embodiment, the base portion comprises a rotary motor having an output shaft driving a rotary transverse shaft through a gear system, wherein said transverse shaft is supported in the shaving head and positioned parallel to the cutting edge, and wherein said transverse shaft is provided with an eccentric disc at each end of it, wherein each eccentric disc is supported in a bearing in a drive member, so that at least a part of said drive member makes a reciprocating motion in a main cutting direction of the cutting member, wherein the said parts of the drive member engage both ends of the cutting member. In this embodiment the rotary motion is transferred into a reciprocating motion in the shaving head, close to the cutting member, whereby vibrations can be limited to a minimum value. Examples of this embodiment are described hereinafter as first and second embodiment of the drive mechanism. Preferably, the cutting member is detachably engaged by the drive members, so that it can be easily renewed from time to time. Furthermore, preferably, the distance between the rotary motor and said gear system can vary because one part of the rotary shaft between the motor and the gear system can shift in axial direction in a hole in another part of that rotary shaft. Such adaptation of the length of said rotary shaft is required because the base portion hinges with respect to the shaving head around said pivot axis, which pivot axis crosses said rotary shaft at a certain distance. Preferably, there are spring means for pretensioning said one part and said another part of said rotary shaft away from each other, which pretensioning improves the hinging behavior of the shaving head. In one preferred embodiment, the two drive members are supported in the shaving head by means of a parallel guidance mechanism(?), so that they can move only in the main cutting direction, wherein said bearing is attached to the drive member by means of another parallel guidance mechanism(?j, so that the bearing can move only relative to the drive member in a direction perpendicular to the main cutting direction. As a result the eccentric rotational motion of the transverse shaft drives the drive members in an effective manner in a periodical or reciprocating motion in the main cutting direction. An example of this embodiment is hereinafter described as first embodiment of the drive mechanism. In another preferred embodiment, each of the two drive members is hingedly supported in a tilting member, which tilting member is hingedly supported in the shaving head, wherein the location of the hinging axes is such that said part of the drive member makes a motion in the main cutting direction when the bearing of the disc makes an eccentric rotating motion. In this embodiment there are only hinging motions, and there are no mutually connected parts that shift with respect to each other. Such hinging connections have a good resistance against wear. An example of this embodiment is hereinafter described as second embodiment of the drive mechanism. In one preferred embodiment, the base portion comprises a rotary motor having an output shaft driving two transverse members extending parallel to the cutting edge, so that the two transverse members make reciprocating motions parallel to the cutting edge in mutually opposite directions, wherein each transverse member connects said output shaft with the first end of a lever member extending substantially parallel to said output shaft, wherein both lever members are hingedly supported in the base portion so that the second ends of the lever members make opposite reciprocating motions parallel to the cutting edge, which ends engage means for driving the cutting member in a main cutting direction of the cutting member, said means being present in the shaving head. The symmetrical design and the opposite directions result in a system that is balanced in the direction parallel to the cutting edge, so that vibrations in the hand of the shaving person are minimized. Furthermore, the forces to be transferred are distributed over two levers, so that each lever has to transfer half the force to be transferred. The fact that the drive motion enters the shaving head at two sides improves the stability of the shaving head. Because the central part of the shaving device can be kept open, the shaving person has good visibility of the shaving process. Examples of this embodiment are hereinafter described as third and fourth embodiment of the drive mechanism. Preferably, said means for driving the cutting member comprise two hinging elements pivotably attached to the shaving head as well as to the cutting member, wherein the cutting member can move in the main cutting direction in the shaving head, so that a motion parallel to the cutting edge of a part of the hinging element results in a motion in the main cutting direction of the cutting member relative to the shaving head, wherein said second ends of the lever members engage said part of the hinging element. An example of this embodiment will hereinafter be described as third embodiment of the drive mechanism. Preferably said second ends of the lever members detachably engage said part of the hinging element, so that the base portion can be separated from the shaving head. The shaving head can be a disposable portion, so that it can be renewed from time to time. In one preferred embodiment, said means for driving the cutting member comprise two drive elements, wherein each drive element is hinged to the cutting member, wherein another part of the drive element is engaged by said second ends of the lever members, preferably detachably, so that the lever members drive said other parts parallel to the cutting edge. The two drive elements can pull and push the cutting member, but preferably they only push the cutting member, wherein the cutting member returns to its original position by spring means. In this manner a simple and effective construction is obtained. An example of this embodiment will hereinafter be described as fourth embodiment of the drive mechanism. In one preferred embodiment, the base portion comprises a rotary motor having an output shaft driving two hinging members, which members hinge in a plane through the axis of the output shaft and extend parallel to the cutting edge, wherein a first part of each hinging member is driven by the output shaft in a reciprocating motion substantially in a direction perpendicular to the output shaft, and wherein a second part of the hinging member can make a reciprocating motion substantially parallel to the output shaft, and wherein each of said second parts is connected through drive means to the cutting member in order to drive the cutting member in a reciprocating motion in a main cutting direction of the cutting member. The hinging members are simple and effective means for transferring the reciprocating motion parallel to the cutting edge into a motion perpendicular to the cutting edge, and because two hinging members are used the drive system is balanced and each member transfers half the total force. Furthermore, the drive motion enters the shaving head at two sides, which improves the stability of the shaving head. The central part of the shaving device can be left open, so that the shaving person has good visibility of the shaving process. Examples of this embodiment will hereinafter be described as fifth and sixth embodiments of the drive mechanism. Preferably, each hinging member is connected through pulling cables with said output shaft and/or with said drive means, wherein, as shown in the fifth embodiment of the drive mechanism described hereinafter, two pulling cables are connected to transverse members that are driven in opposite directions, in reciprocating maimer, parallel to the cutting edge by the output shaft of the rotary motor, wherein each pulling cable is guided by the hinging member from a direction parallel to the cutting edge into a direction parallel to said output shaft towards the shaving head for driving the cutting member. Furthermore, preferably, as shown in the sixth embodiment of the drive mechanism, the two hinging members are jointly made of one piece of elastic material, such as metal or plastic material, so that the two members support each other. They keep each other in the correct position and a substantial portion of the forces is balanced. ' In another preferred embodiment, an example of which will not be described hereinafter, the base portion comprises a rotaiy motor having an output shaft driving inner cables of ends of two Bowden cables extending parallel to the cutting edge, so that the inner cables make reciprocating longitudinal motions relative to the respective outer cables, wherein each inner cable connects said output shaft to drive means for driving the cutting member in a reciprocating motion in a main cutting direction of the cutting member. A Bowden cable has the advantage that a motion can be easily transferred between parts moving relative to each other, as is the case between the handle of the shaving device and the shaving head In one preferred embodiment, the base portion comprises a rotary motor having an output shaft driving two transverse elements extending substantially parallel to the cutting edge, wherein the two transverse elements are substantially positioned in said pivot axis, wherein the rotaiy motion of the output shaft is converted into reciprocating motions in opposite directions of the two transverse elements, and wherein the ends of the transverse elements are connected with means for driving the cutting member in a main cutting direction of the cutting member. Because the motion is guided from the rotary shaft of the motor to the cutting member by an axial motion through the pivot axis, there is no influence of the transferred motion on the hinging movement of the base portion with respect to the shaving head. An example of this embodiment will be described hereinafter as seventh embodiment of the drive mechanism. Preferably, the cutting member is attached to the shaving head by means of connection members extending in a direction perpendicular to the main cutting direction, wherein the ends of the connection members near the skin contact surface are attached to the cutting member and the ends remote from the skin contact surface are attached to the shaving head, so that the cutting member can make a reciprocating motion in the main cutting direction in the shaving head. As a result the cutting member can only make a substantial reciprocating motion in the shaving direction. In one preferred embodiment, the shaving head comprises spring means for pushing the cutting member in the main cutting direction, so that a reciprocating motion of the cutting member can be obtained by exerting a periodical force on the cutting member in the main cutting direction. Furthermore, such spring means improves the stability of the cutting member in the shaving head. In one preferred embodiment, the output shaft of the rotary motor is a double crankshaft in order to provide for opposing reciprocating motions parallel to the cutting edge. Such a double crankshaft is a simple construction and is for example present in the third embodiment of the drive mechanism described hereinafter. In one preferred embodiment, the output shaft of the rotary motor is provided with one or more cam surfaces, preferably eccentric discs, in order to provide for opposing reciprocating motions parallel to the cutting edge. Such cam surfaces can be formed by one or two eccentric discs, by a rotating elliptical disc, or by an internal surface of a recess of a rotating member. It is emphasized that the motion of the cutting member in the main cutting direction is not necessarily the only motion of the cutting member. There can also be a motion component in a Z-direction perpendicular to the main cutting direction and to the cutting edge. For example, the cutting member can make an elliptical motion in the shaving head. However, there will always be a substantial motion component in the main cutting direction. In the following, embodiments of a device for shaving hairs in accordance with the invention and of a shaving head in accordance with the invention will be described in detail with reference to the accompanying Figures, in which Fig. 1 schematically shows an embodiment of a device for shaving hairs in accordance with the invention; Fig. 2 shows the device of Fig. 1 in more detail; Fig. 3 shows a portion of a shaving head in accordance with the invention used in the device of Fig. 2; Fig. 4 is a side view of the shaving head of the device of Fig. 2; Fig. 5 shows a coupling and pivot member of the shaving head of the device of Fig. 2; Figs. 6-9 show a second embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention; Figs. 10-13 show a third embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention; Figs. 14-16 show a fourth embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention; Figs. 17-18 show a fifth embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention; Fig. 19 shows a sixth embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention; and Figs. 20-22 show a seventh embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention; Figure 1 only schematically shows the main parts of an embodiment of a device 1 for shaving hairs in accordance with the invention. The device 1 comprises a base portion 3 having a grip 5 by means of which a user of the device 1 can hold the device 1 in his hand. The device 1 further comprises a shaving head 7 which, in this embodiment, carries two cutting members 9,11. The cutting members 9,11 each comprise a cutting blade 10,12. The cutting blades 10,12 extend substantially parallel to each other and each comprise a single straight cutting edge 13,15. The cutting edges 13,15 define a main cutting direction or shaving direction X of the shaving head 7 extending substantially perpendicularly to the It is further noted that the invention also covers embodiments of a device for shaving hairs to which the periodical motion of the cutting members) is different from the reciprocating motion (P) of the cutting members 9,11 of the device 1. The periodical motion may, for example, have an elliptical path in an imaginary plane perpendicular to the skin contact surface or a circular or elliptical path in an imaginary plane parallel to the skin contact surface. In order to achieve a considerable improvement of the cutting action of the cutting members), it is preferred that the periodical motion of the cutting members) has a motion component which extends substantially parallel to the main cutting direction or shaving direction X of the cutting member, as is the case in the device 1 and also in the alternative devices having the elliptical or circular motions mentioned hereinbefore. In such preferred embodiments, it is further preferred that the pivot axis of the shaving head extends substantially parallel to the skin contact surface and substantially perpendicularly to the main cutting direction or shaving direction X, as is also the case in the device 1, in order to provide an optimal skin-contour following ability of the shaving head. It is however noted that the invention also covers embodiments in which the periodical motion of the cutting member(s) does not have such a motion component parallel to the main cutting direction, for example an embodiment in which a blade-shaped cutting member with a single straight cutting edge reciprocates in a direction parallel to the cutting edge. It is further noted that, in embodiments with two or more cutting members, each cutting member may be subject to a different periodical motion. It is further noted that the invention also covers embodiments in which the shaving head 7 is not releasable from the base portion 3. In such an alternative embodiment, the cutting member(s) or a sub-frame carrying the cutting member(s) may be releasably mounted to the shaving head, so that the cutting member(s) or said sub-frame can be removed from the shaving head and exchanged by (a) new cutting members) or by a sub-frame carrying (a) new cutting members) when the cutting members are worn out It is further noted that the invention also covers embodiments which do not have a pretensioning member to better define the skin contact pressure exerted by the cutting members) on the skin, or which have a different kind of pretensioning member. An example of such an alternative embodiment is a device in which the shaving head is pivoted relative to the base portion, and in which the cutting members are arranged in a sub-frame which is suspended in the shaving head via a pretensioning member, preferably one or more mechanical springs. It is finally noted that the invention also covers embodiments in which the actuator for effecting the periodical motion of the cutting members) is arranged in the shaving head. In such an embodiment the actuator may, for example, be a piezo-electric actuator having sufficiently small dimensions. A first embodiment of a drive mechanism for obtaining the reciprocating (or periodical) motion of the cutting member 9,11 in the shaving direction (5C-direction) is shown in Figures 3 and 4 and was described hereinbefore. Figures 6 to 22 are schematic and diagrammatic representations of further examples of embodiments of a drive mechanism for the cutting member relative to the shaving head. In all these embodiments the base portion (handle) of the shaving device comprises a battery and a rotary electric motor with a rotating output shaft being coaxial with the base portion (handle). The rotating motion of the output shaft of the motor is converted into a reciprocating motion of the cutting member in the X- direction (shaving direction) relative to the shaving head by means of the drive mechanism. Apart from the movable cutting member, the shaving head comprises a skin stretching element and a skin lubricating member as is shown in Figure 1 (reference numerals 19 and 21 respectively). The shaving head is hinged to the base portion (handle), so that the shaving head can follow the surface of the skin during the shaving process, independently of the angular position of the base portion (handle). In addition, the shaving head pivots around a pivot axis positioned near the skin stretching element and parallel to the cutting edges of the cutting blades (transverse direction or Y-direction). ' Figures 6-9 show a second embodiment of a drive mechanism comprising an electrical rotary motor 101 having a hollow output shaft 102. The axial hole in the hollow output shaft 102 is triangular, so that the sliding shaft 103 having a triangular cross section can axially move in the output shaft 102 of the motor 101. The motor 101, and the hollow output shaft 102, and a battery (not shown) to supply electrical power to the motor 101, are housed in the base portion (in Figure 2 indicated by means of reference numeral 3) of the shaving device. The remainder of the drive mechanism, as shown in Figure 6, is housed in the shaving head (in Figure 2 indicated by means of reference numeral 7), which shaving head can rotate around a pivot axis 104 with respect to the base portion. Because the pivot axis 104 is positioned at a distance from the axis of the output shaft 102 and sliding shaft 103, the sliding shaft 103 has to slide in the axial direction with respect to the output shaft 102 when the shaving head is rotating around pivot axis 104. Figure 6 shows a gear system 105 for converting the rotational motion of the sliding shaft 103 into a rotational motion of the transverse shaft 106 by means of a bevelled gear on the sliding shaft 103 engaging a bevelled gear on the transverse shaft 106. Transverse shaft 106 is supported in two bearings 107 (see Figure 8). Each bearing 107 is fixed in a support plate 108, which support plate 108 is fixed in the side portion 109 (see Figure 7) at each side of the shaving head. The two side portions 109 are interconnected by a bottom portion that is not shown in the Figures 6 to 9, which bottom portion comprises the skin stretching element and the skin lubricating member (19 and 21 in Figure 1). Both ends of transverse shaft 106 carry an eccentric disc 110, which eccentric disc 110 can move a bearing 111 in a circular path in a radial plane. Bearing 111 is fixed in driving yoke 112, so that driving yoke 112 can be moved by the rotation of the transverse shaft 106. Driving yoke 112 is connected with a tilting plate 113 by means of a bearing 114, and tilting plate 113 is connected with the side portion 109 by means of a bearing 115. Therefore, tilting plate 113 can rotate in side portion 109 around bearing 115, so that bearing 114 can move in a substantially vertical direction in the Figures (perpendicular to the X-direction and to the Y-direction), and therefore the lower side of driving yoke 112 makes a reciprocating motion having a substantial horizontal component, thereby moving the cutting member 116 forward and backward in the shaving direction (X-direction). As shown in Figure 9, the cutting member 116 comprises three blades 117 with at each end a blade holder 118 supporting the three blades 117. It will be clear that a rotary motion of the transverse shaft 106 results in a reciprocating motion of the lower part of the driving yoke 112, which reciprocating motion has a relatively large component in the shaving direction (X-direction), so that the cutting member 116 will be driven in a reciprocating motion in the shaving direction. The cutting member 116 is a disposable part, which part can be renewed from time to time. In the third and the fourth embodiment of a drive mechanism, the motion of the rotary motor in the base portion (handle) of the shaving device is transferred to the shaving head at the location of the pivot axis, i.e. the axis around which the shaving head can rotate relative to the base portion. As a result, the transferred motion has a direction which is coaxial with respect to said pivot axis, and therefore the hinging motion of the shaving head during the shaving process action is not influenced or disturbed by the transfer of the motion. Figures 10-13 show a third embodiment of the drive mechanism. Figure 10 is a perspective and exploded view representing the battery 121 and the rotary motor 122 with a double crankshaft 123 as output shaft. These elements, together with the transfer mechanism 124, are mounted in the base portion (handle) of the shaving device. A funnel member 125 is hinged to the shaving head 126 including the cutting member and the suspension of the cutting member. The transfer mechanism 124 is connected to the double crankshaft 123, wherein each of the two transverse members 127 engage a different eccentric part of the double crankshaft 123, so that the two transverse members 127 make reciprocating motions in opposite directions in the transverse direction (Y-direction). Each transverse member 127 is connected to a lever member 128. The lever members 128 are hinged to the ends of a supporting element 129, so that the other ends 130 of the lever members 128 also reciprocate in mutually opposite directions, i.e. towards each other and away from each other. The transfer mechanism 124 is made by one injection moulding operation and the constituent parts (transverse members 127, lever members 128 and supporting element 129) are interconnected through elastic hinges. The transfer mechanism 124 is mounted in the base portion (handle) of the shaving device, together with the rotaiy motor 122 and the battery 121. In order to connect the base portion (handle) of the shaving device with the shaving head 126, the ends 130 of the lever members 128 can be shifted into the funnel member 125, with the supporting element 129 being releasably attachable to the funnel member 125. Figure 11 is a top view of the funnel member 125 and the shaving head 126 comprising the cutting blades and the suspension of the cutting blades in more detail. Figure 12 is a more detailed top view of the shaving head 126, and Figure 13 is a bottom view of the shaving head 126. The cutting member consists of three cutting blades 132 and three cross bars 133, holding the cutting blades 132, one in the middle and one at each end of the cutting blades 132. The ends of the three cross bars 133 are interconnected by two leaf springs 134, and each leaf spring 134 is attached to a frame 135 at two locations 136 (see in particular Figure 13). Therefore, the three blades 132 can make a reciprocating motion with respect to the frame 135 in the shaving direction, indicated by means of arrow X in Figures 11 and 12. The reciprocating motion of the blades 132 in the X-direction is driven by means of two hinging elements in the form of two triangle members 137. Triangle member 137 is flexibly attached to the frame 135 at point 138, so that corner 139 can move in the X-direction and corner 140 can move in the transverse direction indicated by means of arrow Y. Corners 140 can be engaged by the ends 130 of the lever members 128 (see Figure 10) after the lever members 128 are shifted into funnel member 125. So, by means of the two triangle members 137 the reciprocating motion of said ends 130 in the Y-direction is converted to a reciprocating motion of corner 139 in the X-direction. Each corner 139 of triangle members 137 is connected through a connection bar 141 to a cross bar 133, so that the reciprocating motion in the X-direction is transferred to the blades 132. Figures 14-16 show a fourth embodiment of the drive mechanism. Figure 14 is a perspective view of the shaving head 145 and the transmission housing 146 carrying a part of the drive mechanism and belonging to the base portion (handle) of the shaving device. Figure 15 is a perspective view of the shaving head 145. Figure 16 is a perspective view of a section of the shaving head. The part of the drive mechanism in the housing 146 can be connected to a rotary motor via a double crankshaft as shown in Figure 10, so that the lever members 147 move similarly to the lever members 128 of the third embodiment The lever members 147 pivot in the housing 146 around a point indicated by means of reference numeral 148. The housing 146 is hinged to the shaving head 145, and the ends 149 of the two lever members 147 are hinged to the ends 150 of two drive elements in the form of driving rods 151 (see Figure 15), with all these hinged connections having the same pivot axis in the transverse direction (Y-direction) and being detachable, thus allowing the base portion (handle) to be separated from the shaving head 145, being a disposable part that can be renewed from time to time. The ends 149 of the two lever members 147 reciprocate in opposite directions and thereby drive the ends 150 of the two driving rods 151 in the transverse direction (Y-direction, parallel to the cutting blades). As shown in Figure 15, the other ends 153 of the two driving rods 151 are hinged to the cutting member 154. Cutting member 154 is movably supported in the frame 155 of the shaving head 145, and can move in the shaving direction (X-direction). Due to the inclined positions of the two driving rods 151, motions of the ends 150 in the transverse direction (Y-direction, parallel to the cutting blades) will result in motions of the ends 153 in the shaving direction (X-direction). Two springs 152 urge the cutting member 154 in one X-direction, so that the driving rods 151 only have to push the cutting member 154 in the other X-direction. In Figure 16, six of the ten spring rods 156, connecting the cutting member 154 with the frame 155 of the shaving head, are represented. The spring rods 156 are positioned perpendicularly to the skin contact surface (in Figure 1, indicated by means of reference numeral 23) and allow motion of the cutting member 154 in the shaving direction (X-direction) relative to the frame 155. The cutting member 154 is provided with three cutting blades 157. The frame 155 of the shaving head 145 also carries a skin stretching element 158 and a skin lubricating member 159, both for abutting against the skin during the shaving process. Figures 17 and 18 show a fifth embodiment of a drive mechanism, wherein the motion of the rotary motor 161 in the base portion (handle) of the shaving device is transferred to the shaving head by means of pulling cables 162. According to Figure 17, the output shaft of the rotary motor 161 is provided with a disc 163 having an oval or elliptical cam surface. Two wheels 164 are rolling over the oval cam surface of the disc 163, so that these wheels 164 make a reciprocating motion in opposite directions (in theY-direction, perpendicular to the output shaft of the motor 161). Each of the two wheels 164 is carried in a transverse member 165, so that these members also make a reciprocating motion in opposite Y-directions. According to Figure 17 the transverse member 165 comprises two parallel plates, and the wheel 164 rotates between these plates. The plates are provided with slots in order to accommodate the shaft of the wheel 164 of the other transverse member 165, so that the two transverse members 165 form one part extending in the Y-direction and having a varying length. According to Figure 18 the transverse member 165 is a curved arm that can be displaced in the Y-direction by the rotating oval disc 163. In both cases the two transverse members 165 can be pulled together by means of a spring 166 (as is shown in Figure 18), so that the two wheels 164 are pushed to the surface of the oval disc 163. The outer ends 167 of the transverse members 165 are connected to the ends of pulling cables 162, so that these cables 162 are driven in a reciprocating longitudinal ' motion by means of the transverse members 165 when the rotary motor 161 is in operation. The cables 162 are guided by hinging members 168 from a transverse direction to a direction parallel to the output shaft of the rotary motor 161 (the axial direction of the base portion or handle). The other ends of the pulling cables 162 are connected through drive means to the cutting member 171 in the shaving head, so that a pulling force in the cables can move the cutting member 171 in one X-direction, while spring means pull or push the cutting member 171 in the other X-direction. According to Figure 17, the shaving head comprises a cartridge holder 169 and a cartridge 170 including the cutting member 171. The cartridge 170 is provided with the skin stretching element and the skin lubricating member (reference numerals 19 and 21 in Figure 1) and the cutting member 171 can make a reciprocating motion in the shaving direction in the cartridge 170. Both sides of the cartridge 170 are provided with a coupling element 172 that can engage a corresponding coupling element 173 in the cartridge holder 169, so that the motion of the cable 162 can be transferred through these drive means to the cutting member 171. The cartridge 170 is a disposable part that can be renewed from time to time. Figure 19 shows the two hinging members 174, which hinging members 174 are connected to each other. In the design as shown in Figure 19, the two hinging members 174 are made out of one piece of plate metal, and part 175 interconnects the two hinging members 174. Because of the elasticity of the material, part 175 functions as a spring, causing the two hinging parts 174 to be pressed apart, so that a wheel 176 at each of the hinging members 174 is rolling over the inner cam surface of the ring 177 that is connected to the output shaft of the motor. The cam surface provides for a reciprocating motion of the two wheels 176 in opposite directions, which causes a reciprocating motion at the ends 178. Each end 178 can be connected to a pulling cable as shown in Figure 17, to transfer the reciprocating motion to the cutting member in the shaving head. The two hinging members 174 can also be made of plastic material by means of an injection moulding operation; This drive mechanism is referred to as the sixth embodiment Figures 20-22 show the seventh embodiment of the drive mechanism. Figure 20 is a perspective view of the shaving device, wherein a part of the housing 180 of the base portion (handle) is taken away. Figure 21 is a perspective view of the disposable part of the shaving device, and Figure 22 shows that part from its lower side. Figure 20 shows the housing 180 of the base portion, enclosing the electric rotary motor 181 and the battery 182. The base portion engages an intermediate part 183, which intermediate part 183 is connected to the shaving head 184 by means of two arms 185. The ends of the two arms 185 are hinged to the shaving head 184, so that the shaving head 184 can pivot around a pivot axis in the transverse direction (Y-direction), perpendicular to the shaving direction (X-direction). Figure 22 shows the intermediate part 183 and the shaving head 184 in more detail. In the intermediate part 183 there is a rotary shaft 186 that will be engaged by the output shaft of the rotary motor when the intermediate part 183 is attached to the housing 180 of the base portion. The rotaiy shaft 186 terminates at the location of said pivot axis, where the rotary shaft 186 is provided with a disc 187 having an oval cam surface. The rotary motion of the disc 187 is converted into two opposite reciprocating motions of the push rods 188 extending at the location of the pivot axis, i.e. in the transverse direction (Y-direction). In order to achieve that motion, the ends of the push rods 188 are pushed against the oval cam surface of the disc 187. The other ends of the push rods 188 are connected to drive means for driving the cutting member 189 in a reciprocating motion in the shaving direction. Cutting member 189 is provided with three cutting blades 190. These drive means are not represented in detail in Figure 22, but they can be similar to the drive means of the third embodiment (shown in Figure 12, reference numeral 137) or of the fourth embodiment (shown in Figure 15, reference numeral 151). Furthermore spring means can be present to push the push rods 188 against the cam surface and/or to urge the cutting member 189 in one X-direction, so that the drive means can push the cutting member in the other X-direction. As an alternative, the disposable part of the shaving device can be limited to the cutting member 198 or to the shaving head 184, so that a larger part of the drive mechanism is part of the permanent portion of the shaving device, and hence the disposable part is smaller. WE CLAIM: 1. A device for shaving hairs growing from skin, comprising a base portion having a grip, a shaving head carrying at least one blade-shaped cutting member having at least one cutting edge, and an actuator for effecting a periodical motion of the cutting member relative to the base portion, characterized in that the shaving head is pivotable relative to the base portion about a pivot axis, and the periodical motion of the cutting member is a periodical motion relative to the shaving head. 2. A device as claimed in claim 1, characterized in that the shaving head comprises a skin contact member defining a skin contact surface, the pivot axis extending substantially parallel to the skin contact surface. 3. A device as claimed in claim 1, characterized in that the periodical motion has a motion component which extends substantially parallel to a main cutting direction of the cutting member, the pivot axis extending substantially perpendicularly to the main cutting direction. 4. A device as claimed in claim 3, characterized in that the periodical motion is a reciprocating motion in a direction substantially parallel to the main cutting direction. 5. A device as claimed in claim 3, characterized in that the cutting member comprises a single straight cutting edge, the pivot axis extending parallel to the cutting edge and, seen in the main cutting direction, being arranged in front of the cutting edge. 6. A device as claimed in claim 1, characterized in that the device further comprises a pretensioning member which defines a skin contact pressure exerted by the cutting member on the skin during operation. 7. A device as claimed in claim 6, characterized in that the pretensioning member comprises a mechanical spring mounted to the shaving head and to the base portion for exerting a pretensioning torque on the shaving head about the pivot axis. 8. A device as claimed in claim 1, characterized in that the actuator is arranged in the base portion and effects the periodical motion of the cutting member via a transmission system which is partially arranged in the base portion and partially arranged in the shaving head. 9. A device as claimed in claim 1, characterized in that the shaving head is releasably mounted to the base portion. 10. A device as claimed in claim 1, characterized in that the cutting member is releasably mounted to the shaving head. 11. A device as claimed in claim 8, characterized in that the base portion comprises a rotary motor having an output shaft driving a rotary transverse shaft through a gear system, wherein said transverse shaft is supported in the shaving head and positioned parallel to the cutting edge, and wherein said transverse shaft is provided with an eccentric disc at each end of it, wherein each eccentric disc is supported in a bearing in a drive : member, so that at least a part of said drive member makes a reciprocating motion in a main cutting direction of the cutting member, wherein the said parts of the drive member engage both ends of the cutting member. 12. A device as claimed in claim 8, characterized in that the base portion comprises a rotary motor having an output shaft driving two transverse members extending parallel to the cutting edge, so that the two transverse members make reciprocating motions parallel to the cutting edge in mutually opposite directions, wherein each transverse member connects said output shaft with the first end of a lever member extending substantially parallel to said output shaft, wherein both lever members are hingedly supported in the base portion so that the second ends of the lever members make opposite reciprocating motions parallel to the cutting edge, which ends engage means for driving the cutting member in a main cutting direction of the cutting member, said means being present in the shaving head. 13. A device as claimed in claim 8, characterized in that the base portion comprises a rotaiy motor having an output shaft driving two hinging members, which members hinge in a plane through the axis of the output shaft and extend parallel to the cutting edge, wherein a first part of each hinging member is driven by the output shaft in a reciprocating motion substantially in a direction perpendicular to the output shaft, and wherein a second part of the hinging member can make a reciprocating motion substantially parallel to the output shaft, and wherein each of said second parts is connected through drive means to the cutting member in order to drive the cutting member in a reciprocating motion in a main cutting direction of the cutting member. 14. A device as claimed in claim 8, characterized in that the base portion comprises a rotary motor having an output shaft driving inner cables of ends of two Bowden cables extending parallel to the cutting edge, so that the inner cables make reciprocating longitudinal motions relative to the respective outer cables, wherein each inner cable connects said output shaft to drive means for driving the cutting member in a reciprocating motion in a main cutting direction of the cutting member. 15. A device as claimed in claim 8, characterized in that the base portion comprises a rotary motor having an output shaft driving two transverse elements extending substantially parallel to the cutting edge, wherein the two transverse elements are substantially positioned in said pivot axis, wherein the rotary motion of the output shaft is converted into reciprocating motions in opposite directions of the two transverse elements, and wherein the ends of the transverse elements are connected with means for driving the cutting member in a main cutting direction of the cutting member. 16. A shaving head suitable for use in a device for shaving hairs growing from skin, the shaving head carrying at least one blade-shaped cutting member having at least one cutting edge, the shaving head further comprising a coupling member by means of which the shaving head can be coupled to a base portion of said device, said base portion comprising a grip and an actuator for effecting a periodical motion of the cutting member relative to the base portion, characterized in that the periodical motion of the cutting member is a periodical motion relative to the shaving head, and the shaving head comprises a pivot member by means of which, in a condition where the shaving head is mounted to the base portion, the shaving head is pivotable relative to the base portion about a pivot axis. Dated this 30th day of June 2006

Full Text

A shaving device with a pivotable shaving head carrying an actively driven cutting member
The invention relates to a device for shaving hairs growing from skin, comprising a base portion having a grip, a shaving head carrying at least one blade-shaped cutting member having at least one cutting edge, and an actuator for effecting a periodical motion of the cutting member relative to the base portion.
The invention also relates to a shaving head suitable for use in a device for shaving hairs growing from skin, the shaving head carrying at least one blade-shaped cutting member having at least one cutting edge, the shaving head further comprising a coupling member by means of which the shaving head can be coupled to a base portion of said device, said base portion comprising a grip and an actuator for effecting a periodical motion of the cutting member relative to the base portion.
A device for shaving hairs of the kind mentioned in the opening paragraphs is known from US-A-2,054,418. The shaving head of the known device comprises a blade-shaped cutting member. The actuator of the known device comprises an electric motor, which is arranged in the base portion and has a shaft to which a flywheel is eccentrically secured. The flywheel is located in the shaving head of the known device and extends substantially parallel to the main surfaces of the cutting member. The shaft is supported by two bearings, one of which is also arranged in the shaving head. During operation, when the flywheel is rotated by the motor, the flywheel exerts periodical forces on the bearings. Via the bearing arranged in the shaving head, said forces are transmitted to the shaving head and effect a circular periodical motion of the shaving head and of the cutting member mounted therein relative to the base portion. The circular periodical motion of the cutting member takes place substantially in an imaginary plane parallel to the main surfaces of the cutting member. As a result of said periodical motion of the cutting member, the device has an improved hair cutting action.
A disadvantage of the known device for shaving hairs is that the risk of skin irritations and skin injuries is considerably increased as a result of the periodical motion of the cutting member.

It is an object of the invention to provide a device for shaving hairs and a shaving head of the kinds mentioned in the opening paragraphs which have an improved hair cutting action as a result of the periodical motion of the blade-shaped cutting member, but which have a smaller risk of skin irritations and skin injuries.
In order to achieve said object, a device for shaving hairs in accordance with the invention is characterized in that the shaving head is pivotable relative to the base portion about a pivot axis, and the periodical motion of the cutting member is a periodical motion relative to the shaving head.
In order to achieve said object, a shaving head in accordance with the invention is characterized in that the periodical motion of the cutting member is a periodical motion relative to the shaving head, and the shaving head comprises a pivot member by . means of which, in a condition where the shaving head is mounted to the base portion, the shaving head is pivotable relative to the base portion about a pivot axis.
The invention is based on the insight that, for a shaving device wherein the blade-shaped cutting member performs a periodical motion, the risk of skin irritations and skin injuries is considerably reduced if the geometrical path, which is followed by the cutting member during the periodical motion, has a well-defined position and orientation with respect to the skin surface. Since in accordance with the invention the shaving head is pivotable relative to the base portion, the position and orientation of said geometrical path are less dependent on, or even independent of, the position and orientation of the base portion with respect to the skin surface, so that the position and orientation of said geometrical path are less dependent on the manner in which the user holds the grip in his hand and holds his hand with respect to the skin surface. As a result of said pivot axis, the position and orientation of said geometrical path are mainly determined by the contact forces between the shaving head and the skin surface. Said contact forces lead to a pivotal motion of the shaving head about the pivot axis into a position, in which the shaving head is in optimum contact with the skin and in which, accordingly, the geometrical path of the cutting member has a well-defined position and orientation with respect to the skin surface. Since, in addition, the periodical motion of the cutting member is a periodical motion relative to the shaving head, the shaving head is stationary with respect to the base portion apart from pivotal motions about said pivot axis. As a result, the position and orientation of the geometrical path of the periodical motion of the cutting member relative to the skin are even better defined.

A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the shaving head comprises a skin contact member defining a skin contact surface, the pivot axis extending substantially parallel to the skin contact surface. As a result, the shaving head has a further improved skin-contour following ability, so that the position and orientation of the geometrical path of the periodical motion of the cutting member with respect to the skin surface are even better defined and the risk of skin irritations and skin injuries is further reduced.
A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the periodical motion has a motion component which extends substantially parallel to a main cutting direction of the cutting member, the pivot axis extending substantially perpendicularly to the main cutting direction. The hair cutting action of the device is considerably improved as a result of said motion component extending parallel to the main cutting direction, and said orientation of the pivot axis perpendicular to the main cutting direction, i.e. parallel to said motion component, provides an optimum skin-contour following ability of the shaving head having said motion component.
A further embodiment of a device for shaving hairs in accordance with the invention is characterized in that the periodical motion is a reciprocating motion in a direction substantially parallel to the main cutting direction. The hair cutting action of the device is further improved as a result of said reciprocating motion in said direction substantially parallel to the main cutting direction.
A further embodiment of a device for shaving hairs in accordance with the invention is characterized in that the cutting member comprises a single straight cutting edge, the pivot axis extending parallel to the cutting edge and, seen in the main cutting direction, being arranged in front of the cutting edge. In this manner, for a shaving head with a blade-shaped cutting member having a single straight cutting edge, it is achieved that the contact pressure between the cutting edge of the cutting member and the skin is less dependent on the force with which the user presses the shaving head on the skin. As a result, the shaving performance and the shaving comfort of the device are less dependent on said force exerted by the user.
A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the device further comprises a pretensioning member which defines a skin contact pressure exerted by the cutting member on the skin during operation. As a result of said pretensioning member, it is achieved that the contact pressure between the cutting edge of the cutting member and the skin is less dependent on the force with which the

user presses the shaving head on the skin. As a result, the shaving performance and the shaving comfort of the device are less dependent on said force exerted by the user.
A further embodiment of a device for shaving hairs in accordance with the invention is characterized in that the pretensioning member comprises a mechanical spring mounted to the shaving head and to the base portion for exerting a pretensioning mechanical torque on the shaving head about the pivot axis. In this embodiment, the pretensioning member has a simple, practical and effective structure.
A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the actuator is arranged in the base portion and effects the periodical motion of the cutting member via a transmission system which is partially arranged in the base portion and partially arranged in the shaving head. In this manner, the structure of the shaving head is simplified and the dimensions of the shaving head are considerably reduced. As a result, the shaving head is particularly suitable to be constructed as a detachable shaving head, which can be removed from the base portion and exchanged by a new shaving head when the cutting member is worn out.
A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the shaving head is releasably mounted to the base portion. In this embodiment, the shaving head can be removed from the base portion and exchanged by a new shaving head when the cutting member is worn out.
A particular embodiment of a device for shaving hairs in accordance with the invention is characterized in that the cutting member is releasably mounted to the shaving head. In this embodiment, the cutting member can be removed from the shaving head and exchanged by a new cutting member when the cutting member is worn out.
In one preferred embodiment, the base portion comprises a rotary motor having an output shaft driving a rotary transverse shaft through a gear system, wherein said transverse shaft is supported in the shaving head and positioned parallel to the cutting edge, and wherein said transverse shaft is provided with an eccentric disc at each end of it, wherein each eccentric disc is supported in a bearing in a drive member, so that at least a part of said drive member makes a reciprocating motion in a main cutting direction of the cutting member, wherein the said parts of the drive member engage both ends of the cutting member. In this embodiment the rotary motion is transferred into a reciprocating motion in the shaving head, close to the cutting member, whereby vibrations can be limited to a minimum value. Examples of this embodiment are described hereinafter as first and second embodiment of the drive mechanism.

Preferably, the cutting member is detachably engaged by the drive members, so that it can be easily renewed from time to time. Furthermore, preferably, the distance between the rotary motor and said gear system can vary because one part of the rotary shaft between the motor and the gear system can shift in axial direction in a hole in another part of that rotary shaft. Such adaptation of the length of said rotary shaft is required because the base portion hinges with respect to the shaving head around said pivot axis, which pivot axis crosses said rotary shaft at a certain distance. Preferably, there are spring means for pretensioning said one part and said another part of said rotary shaft away from each other, which pretensioning improves the hinging behavior of the shaving head.
In one preferred embodiment, the two drive members are supported in the shaving head by means of a parallel guidance mechanism(?), so that they can move only in the main cutting direction, wherein said bearing is attached to the drive member by means of another parallel guidance mechanism(?j, so that the bearing can move only relative to the drive member in a direction perpendicular to the main cutting direction. As a result the eccentric rotational motion of the transverse shaft drives the drive members in an effective manner in a periodical or reciprocating motion in the main cutting direction. An example of this embodiment is hereinafter described as first embodiment of the drive mechanism.
In another preferred embodiment, each of the two drive members is hingedly supported in a tilting member, which tilting member is hingedly supported in the shaving head, wherein the location of the hinging axes is such that said part of the drive member makes a motion in the main cutting direction when the bearing of the disc makes an eccentric rotating motion. In this embodiment there are only hinging motions, and there are no mutually connected parts that shift with respect to each other. Such hinging connections have a good resistance against wear. An example of this embodiment is hereinafter described as second embodiment of the drive mechanism.
In one preferred embodiment, the base portion comprises a rotary motor having an output shaft driving two transverse members extending parallel to the cutting edge, so that the two transverse members make reciprocating motions parallel to the cutting edge in mutually opposite directions, wherein each transverse member connects said output shaft with the first end of a lever member extending substantially parallel to said output shaft, wherein both lever members are hingedly supported in the base portion so that the second ends of the lever members make opposite reciprocating motions parallel to the cutting edge, which ends engage means for driving the cutting member in a main cutting direction of the cutting member, said means being present in the shaving head. The symmetrical design and

the opposite directions result in a system that is balanced in the direction parallel to the cutting edge, so that vibrations in the hand of the shaving person are minimized. Furthermore, the forces to be transferred are distributed over two levers, so that each lever has to transfer half the force to be transferred. The fact that the drive motion enters the shaving head at two sides improves the stability of the shaving head. Because the central part of the shaving device can be kept open, the shaving person has good visibility of the shaving process. Examples of this embodiment are hereinafter described as third and fourth embodiment of the drive mechanism.
Preferably, said means for driving the cutting member comprise two hinging elements pivotably attached to the shaving head as well as to the cutting member, wherein the cutting member can move in the main cutting direction in the shaving head, so that a motion parallel to the cutting edge of a part of the hinging element results in a motion in the main cutting direction of the cutting member relative to the shaving head, wherein said second ends of the lever members engage said part of the hinging element. An example of this embodiment will hereinafter be described as third embodiment of the drive mechanism. Preferably said second ends of the lever members detachably engage said part of the hinging element, so that the base portion can be separated from the shaving head. The shaving head can be a disposable portion, so that it can be renewed from time to time.
In one preferred embodiment, said means for driving the cutting member comprise two drive elements, wherein each drive element is hinged to the cutting member, wherein another part of the drive element is engaged by said second ends of the lever members, preferably detachably, so that the lever members drive said other parts parallel to the cutting edge. The two drive elements can pull and push the cutting member, but preferably they only push the cutting member, wherein the cutting member returns to its original position by spring means. In this manner a simple and effective construction is obtained. An example of this embodiment will hereinafter be described as fourth embodiment of the drive mechanism.
In one preferred embodiment, the base portion comprises a rotary motor having an output shaft driving two hinging members, which members hinge in a plane through the axis of the output shaft and extend parallel to the cutting edge, wherein a first part of each hinging member is driven by the output shaft in a reciprocating motion substantially in a direction perpendicular to the output shaft, and wherein a second part of the hinging member can make a reciprocating motion substantially parallel to the output shaft, and wherein each of said second parts is connected through drive means to the cutting

member in order to drive the cutting member in a reciprocating motion in a main cutting direction of the cutting member. The hinging members are simple and effective means for transferring the reciprocating motion parallel to the cutting edge into a motion perpendicular to the cutting edge, and because two hinging members are used the drive system is balanced and each member transfers half the total force. Furthermore, the drive motion enters the shaving head at two sides, which improves the stability of the shaving head. The central part of the shaving device can be left open, so that the shaving person has good visibility of the shaving process. Examples of this embodiment will hereinafter be described as fifth and sixth embodiments of the drive mechanism.
Preferably, each hinging member is connected through pulling cables with said output shaft and/or with said drive means, wherein, as shown in the fifth embodiment of the drive mechanism described hereinafter, two pulling cables are connected to transverse members that are driven in opposite directions, in reciprocating maimer, parallel to the cutting edge by the output shaft of the rotary motor, wherein each pulling cable is guided by the hinging member from a direction parallel to the cutting edge into a direction parallel to said output shaft towards the shaving head for driving the cutting member.
Furthermore, preferably, as shown in the sixth embodiment of the drive mechanism, the two hinging members are jointly made of one piece of elastic material, such as metal or plastic material, so that the two members support each other. They keep each other in the correct position and a substantial portion of the forces is balanced. '
In another preferred embodiment, an example of which will not be described hereinafter, the base portion comprises a rotaiy motor having an output shaft driving inner cables of ends of two Bowden cables extending parallel to the cutting edge, so that the inner cables make reciprocating longitudinal motions relative to the respective outer cables, wherein each inner cable connects said output shaft to drive means for driving the cutting member in a reciprocating motion in a main cutting direction of the cutting member. A Bowden cable has the advantage that a motion can be easily transferred between parts moving relative to each other, as is the case between the handle of the shaving device and the shaving head
In one preferred embodiment, the base portion comprises a rotary motor having an output shaft driving two transverse elements extending substantially parallel to the cutting edge, wherein the two transverse elements are substantially positioned in said pivot axis, wherein the rotaiy motion of the output shaft is converted into reciprocating motions in opposite directions of the two transverse elements, and wherein the ends of the transverse

elements are connected with means for driving the cutting member in a main cutting direction of the cutting member. Because the motion is guided from the rotary shaft of the motor to the cutting member by an axial motion through the pivot axis, there is no influence of the transferred motion on the hinging movement of the base portion with respect to the shaving head. An example of this embodiment will be described hereinafter as seventh embodiment of the drive mechanism.
Preferably, the cutting member is attached to the shaving head by means of connection members extending in a direction perpendicular to the main cutting direction, wherein the ends of the connection members near the skin contact surface are attached to the cutting member and the ends remote from the skin contact surface are attached to the shaving head, so that the cutting member can make a reciprocating motion in the main cutting direction in the shaving head. As a result the cutting member can only make a substantial reciprocating motion in the shaving direction.
In one preferred embodiment, the shaving head comprises spring means for pushing the cutting member in the main cutting direction, so that a reciprocating motion of the cutting member can be obtained by exerting a periodical force on the cutting member in the main cutting direction. Furthermore, such spring means improves the stability of the cutting member in the shaving head.
In one preferred embodiment, the output shaft of the rotary motor is a double crankshaft in order to provide for opposing reciprocating motions parallel to the cutting edge. Such a double crankshaft is a simple construction and is for example present in the third embodiment of the drive mechanism described hereinafter.
In one preferred embodiment, the output shaft of the rotary motor is provided with one or more cam surfaces, preferably eccentric discs, in order to provide for opposing reciprocating motions parallel to the cutting edge. Such cam surfaces can be formed by one or two eccentric discs, by a rotating elliptical disc, or by an internal surface of a recess of a rotating member.
It is emphasized that the motion of the cutting member in the main cutting direction is not necessarily the only motion of the cutting member. There can also be a motion component in a Z-direction perpendicular to the main cutting direction and to the cutting edge. For example, the cutting member can make an elliptical motion in the shaving head. However, there will always be a substantial motion component in the main cutting direction.

In the following, embodiments of a device for shaving hairs in accordance with the invention and of a shaving head in accordance with the invention will be described in detail with reference to the accompanying Figures, in which
Fig. 1 schematically shows an embodiment of a device for shaving hairs in accordance with the invention;
Fig. 2 shows the device of Fig. 1 in more detail;
Fig. 3 shows a portion of a shaving head in accordance with the invention used in the device of Fig. 2;
Fig. 4 is a side view of the shaving head of the device of Fig. 2;
Fig. 5 shows a coupling and pivot member of the shaving head of the device of Fig. 2;
Figs. 6-9 show a second embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention;
Figs. 10-13 show a third embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention;
Figs. 14-16 show a fourth embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention;
Figs. 17-18 show a fifth embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention;
Fig. 19 shows a sixth embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention; and
Figs. 20-22 show a seventh embodiment of a drive mechanism of a device for shaving hairs in accordance with the invention;
Figure 1 only schematically shows the main parts of an embodiment of a device 1 for shaving hairs in accordance with the invention. The device 1 comprises a base portion 3 having a grip 5 by means of which a user of the device 1 can hold the device 1 in his hand. The device 1 further comprises a shaving head 7 which, in this embodiment, carries two cutting members 9,11. The cutting members 9,11 each comprise a cutting blade 10,12. The cutting blades 10,12 extend substantially parallel to each other and each comprise a single straight cutting edge 13,15. The cutting edges 13,15 define a main cutting direction or shaving direction X of the shaving head 7 extending substantially perpendicularly to the

It is further noted that the invention also covers embodiments of a device for shaving hairs to which the periodical motion of the cutting members) is different from the reciprocating motion (P) of the cutting members 9,11 of the device 1. The periodical motion may, for example, have an elliptical path in an imaginary plane perpendicular to the skin contact surface or a circular or elliptical path in an imaginary plane parallel to the skin contact surface. In order to achieve a considerable improvement of the cutting action of the cutting members), it is preferred that the periodical motion of the cutting members) has a motion component which extends substantially parallel to the main cutting direction or shaving direction X of the cutting member, as is the case in the device 1 and also in the alternative devices having the elliptical or circular motions mentioned hereinbefore. In such preferred embodiments, it is further preferred that the pivot axis of the shaving head extends substantially parallel to the skin contact surface and substantially perpendicularly to the main cutting direction or shaving direction X, as is also the case in the device 1, in order to provide an optimal skin-contour following ability of the shaving head. It is however noted that the invention also covers embodiments in which the periodical motion of the cutting member(s) does not have such a motion component parallel to the main cutting direction, for example an embodiment in which a blade-shaped cutting member with a single straight cutting edge reciprocates in a direction parallel to the cutting edge. It is further noted that, in embodiments with two or more cutting members, each cutting member may be subject to a different periodical motion.
It is further noted that the invention also covers embodiments in which the shaving head 7 is not releasable from the base portion 3. In such an alternative embodiment, the cutting member(s) or a sub-frame carrying the cutting member(s) may be releasably mounted to the shaving head, so that the cutting member(s) or said sub-frame can be removed from the shaving head and exchanged by (a) new cutting members) or by a sub-frame carrying (a) new cutting members) when the cutting members are worn out
It is further noted that the invention also covers embodiments which do not have a pretensioning member to better define the skin contact pressure exerted by the cutting members) on the skin, or which have a different kind of pretensioning member. An example of such an alternative embodiment is a device in which the shaving head is pivoted relative to the base portion, and in which the cutting members are arranged in a sub-frame which is suspended in the shaving head via a pretensioning member, preferably one or more mechanical springs.

It is finally noted that the invention also covers embodiments in which the actuator for effecting the periodical motion of the cutting members) is arranged in the shaving head. In such an embodiment the actuator may, for example, be a piezo-electric actuator having sufficiently small dimensions.
A first embodiment of a drive mechanism for obtaining the reciprocating (or
periodical) motion of the cutting member 9,11 in the shaving direction (5C-direction) is shown
in Figures 3 and 4 and was described hereinbefore. Figures 6 to 22 are schematic and
diagrammatic representations of further examples of embodiments of a drive mechanism for
the cutting member relative to the shaving head. In all these embodiments the base portion
(handle) of the shaving device comprises a battery and a rotary electric motor with a rotating
output shaft being coaxial with the base portion (handle). The rotating motion of the output
shaft of the motor is converted into a reciprocating motion of the cutting member in the X-
direction (shaving direction) relative to the shaving head by means of the drive mechanism.
Apart from the movable cutting member, the shaving head comprises a skin stretching
element and a skin lubricating member as is shown in Figure 1 (reference numerals 19 and 21
respectively). The shaving head is hinged to the base portion (handle), so that the shaving
head can follow the surface of the skin during the shaving process, independently of the
angular position of the base portion (handle). In addition, the shaving head pivots around a
pivot axis positioned near the skin stretching element and parallel to the cutting edges of the
cutting blades (transverse direction or Y-direction). '
Figures 6-9 show a second embodiment of a drive mechanism comprising an electrical rotary motor 101 having a hollow output shaft 102. The axial hole in the hollow output shaft 102 is triangular, so that the sliding shaft 103 having a triangular cross section can axially move in the output shaft 102 of the motor 101. The motor 101, and the hollow output shaft 102, and a battery (not shown) to supply electrical power to the motor 101, are housed in the base portion (in Figure 2 indicated by means of reference numeral 3) of the shaving device. The remainder of the drive mechanism, as shown in Figure 6, is housed in the shaving head (in Figure 2 indicated by means of reference numeral 7), which shaving head can rotate around a pivot axis 104 with respect to the base portion. Because the pivot axis 104 is positioned at a distance from the axis of the output shaft 102 and sliding shaft 103, the sliding shaft 103 has to slide in the axial direction with respect to the output shaft 102 when the shaving head is rotating around pivot axis 104.
Figure 6 shows a gear system 105 for converting the rotational motion of the sliding shaft 103 into a rotational motion of the transverse shaft 106 by means of a bevelled

gear on the sliding shaft 103 engaging a bevelled gear on the transverse shaft 106. Transverse shaft 106 is supported in two bearings 107 (see Figure 8). Each bearing 107 is fixed in a support plate 108, which support plate 108 is fixed in the side portion 109 (see Figure 7) at each side of the shaving head. The two side portions 109 are interconnected by a bottom portion that is not shown in the Figures 6 to 9, which bottom portion comprises the skin stretching element and the skin lubricating member (19 and 21 in Figure 1).
Both ends of transverse shaft 106 carry an eccentric disc 110, which eccentric disc 110 can move a bearing 111 in a circular path in a radial plane. Bearing 111 is fixed in driving yoke 112, so that driving yoke 112 can be moved by the rotation of the transverse shaft 106. Driving yoke 112 is connected with a tilting plate 113 by means of a bearing 114, and tilting plate 113 is connected with the side portion 109 by means of a bearing 115. Therefore, tilting plate 113 can rotate in side portion 109 around bearing 115, so that bearing 114 can move in a substantially vertical direction in the Figures (perpendicular to the X-direction and to the Y-direction), and therefore the lower side of driving yoke 112 makes a reciprocating motion having a substantial horizontal component, thereby moving the cutting member 116 forward and backward in the shaving direction (X-direction). As shown in Figure 9, the cutting member 116 comprises three blades 117 with at each end a blade holder 118 supporting the three blades 117.
It will be clear that a rotary motion of the transverse shaft 106 results in a reciprocating motion of the lower part of the driving yoke 112, which reciprocating motion has a relatively large component in the shaving direction (X-direction), so that the cutting member 116 will be driven in a reciprocating motion in the shaving direction. The cutting member 116 is a disposable part, which part can be renewed from time to time.
In the third and the fourth embodiment of a drive mechanism, the motion of the rotary motor in the base portion (handle) of the shaving device is transferred to the shaving head at the location of the pivot axis, i.e. the axis around which the shaving head can rotate relative to the base portion. As a result, the transferred motion has a direction which is coaxial with respect to said pivot axis, and therefore the hinging motion of the shaving head during the shaving process action is not influenced or disturbed by the transfer of the motion.
Figures 10-13 show a third embodiment of the drive mechanism. Figure 10 is a perspective and exploded view representing the battery 121 and the rotary motor 122 with a double crankshaft 123 as output shaft. These elements, together with the transfer mechanism 124, are mounted in the base portion (handle) of the shaving device. A funnel member 125 is

hinged to the shaving head 126 including the cutting member and the suspension of the cutting member.
The transfer mechanism 124 is connected to the double crankshaft 123, wherein each of the two transverse members 127 engage a different eccentric part of the double crankshaft 123, so that the two transverse members 127 make reciprocating motions in opposite directions in the transverse direction (Y-direction). Each transverse member 127 is connected to a lever member 128. The lever members 128 are hinged to the ends of a supporting element 129, so that the other ends 130 of the lever members 128 also reciprocate in mutually opposite directions, i.e. towards each other and away from each other. The transfer mechanism 124 is made by one injection moulding operation and the constituent parts (transverse members 127, lever members 128 and supporting element 129) are interconnected through elastic hinges. The transfer mechanism 124 is mounted in the base portion (handle) of the shaving device, together with the rotaiy motor 122 and the battery 121. In order to connect the base portion (handle) of the shaving device with the shaving head 126, the ends 130 of the lever members 128 can be shifted into the funnel member 125, with the supporting element 129 being releasably attachable to the funnel member 125.
Figure 11 is a top view of the funnel member 125 and the shaving head 126 comprising the cutting blades and the suspension of the cutting blades in more detail. Figure 12 is a more detailed top view of the shaving head 126, and Figure 13 is a bottom view of the shaving head 126.
The cutting member consists of three cutting blades 132 and three cross bars 133, holding the cutting blades 132, one in the middle and one at each end of the cutting blades 132. The ends of the three cross bars 133 are interconnected by two leaf springs 134, and each leaf spring 134 is attached to a frame 135 at two locations 136 (see in particular Figure 13). Therefore, the three blades 132 can make a reciprocating motion with respect to the frame 135 in the shaving direction, indicated by means of arrow X in Figures 11 and 12.
The reciprocating motion of the blades 132 in the X-direction is driven by means of two hinging elements in the form of two triangle members 137. Triangle member 137 is flexibly attached to the frame 135 at point 138, so that corner 139 can move in the X-direction and corner 140 can move in the transverse direction indicated by means of arrow Y. Corners 140 can be engaged by the ends 130 of the lever members 128 (see Figure 10) after the lever members 128 are shifted into funnel member 125. So, by means of the two triangle members 137 the reciprocating motion of said ends 130 in the Y-direction is converted to a reciprocating motion of corner 139 in the X-direction. Each corner 139 of triangle members

137 is connected through a connection bar 141 to a cross bar 133, so that the reciprocating motion in the X-direction is transferred to the blades 132.
Figures 14-16 show a fourth embodiment of the drive mechanism. Figure 14 is a perspective view of the shaving head 145 and the transmission housing 146 carrying a part of the drive mechanism and belonging to the base portion (handle) of the shaving device. Figure 15 is a perspective view of the shaving head 145. Figure 16 is a perspective view of a section of the shaving head.
The part of the drive mechanism in the housing 146 can be connected to a rotary motor via a double crankshaft as shown in Figure 10, so that the lever members 147 move similarly to the lever members 128 of the third embodiment The lever members 147 pivot in the housing 146 around a point indicated by means of reference numeral 148. The housing 146 is hinged to the shaving head 145, and the ends 149 of the two lever members 147 are hinged to the ends 150 of two drive elements in the form of driving rods 151 (see Figure 15), with all these hinged connections having the same pivot axis in the transverse direction (Y-direction) and being detachable, thus allowing the base portion (handle) to be separated from the shaving head 145, being a disposable part that can be renewed from time to time.
The ends 149 of the two lever members 147 reciprocate in opposite directions and thereby drive the ends 150 of the two driving rods 151 in the transverse direction (Y-direction, parallel to the cutting blades). As shown in Figure 15, the other ends 153 of the two driving rods 151 are hinged to the cutting member 154. Cutting member 154 is movably supported in the frame 155 of the shaving head 145, and can move in the shaving direction (X-direction). Due to the inclined positions of the two driving rods 151, motions of the ends 150 in the transverse direction (Y-direction, parallel to the cutting blades) will result in motions of the ends 153 in the shaving direction (X-direction). Two springs 152 urge the cutting member 154 in one X-direction, so that the driving rods 151 only have to push the cutting member 154 in the other X-direction.
In Figure 16, six of the ten spring rods 156, connecting the cutting member 154 with the frame 155 of the shaving head, are represented. The spring rods 156 are positioned perpendicularly to the skin contact surface (in Figure 1, indicated by means of reference numeral 23) and allow motion of the cutting member 154 in the shaving direction (X-direction) relative to the frame 155. The cutting member 154 is provided with three cutting blades 157. The frame 155 of the shaving head 145 also carries a skin stretching

element 158 and a skin lubricating member 159, both for abutting against the skin during the shaving process.
Figures 17 and 18 show a fifth embodiment of a drive mechanism, wherein the motion of the rotary motor 161 in the base portion (handle) of the shaving device is transferred to the shaving head by means of pulling cables 162.
According to Figure 17, the output shaft of the rotary motor 161 is provided with a disc 163 having an oval or elliptical cam surface. Two wheels 164 are rolling over the oval cam surface of the disc 163, so that these wheels 164 make a reciprocating motion in opposite directions (in theY-direction, perpendicular to the output shaft of the motor 161). Each of the two wheels 164 is carried in a transverse member 165, so that these members also make a reciprocating motion in opposite Y-directions.
According to Figure 17 the transverse member 165 comprises two parallel plates, and the wheel 164 rotates between these plates. The plates are provided with slots in order to accommodate the shaft of the wheel 164 of the other transverse member 165, so that the two transverse members 165 form one part extending in the Y-direction and having a varying length. According to Figure 18 the transverse member 165 is a curved arm that can be displaced in the Y-direction by the rotating oval disc 163. In both cases the two transverse members 165 can be pulled together by means of a spring 166 (as is shown in Figure 18), so that the two wheels 164 are pushed to the surface of the oval disc 163.
The outer ends 167 of the transverse members 165 are connected to the ends of pulling cables 162, so that these cables 162 are driven in a reciprocating longitudinal ' motion by means of the transverse members 165 when the rotary motor 161 is in operation. The cables 162 are guided by hinging members 168 from a transverse direction to a direction parallel to the output shaft of the rotary motor 161 (the axial direction of the base portion or handle). The other ends of the pulling cables 162 are connected through drive means to the cutting member 171 in the shaving head, so that a pulling force in the cables can move the cutting member 171 in one X-direction, while spring means pull or push the cutting member 171 in the other X-direction.
According to Figure 17, the shaving head comprises a cartridge holder 169 and a cartridge 170 including the cutting member 171. The cartridge 170 is provided with the skin stretching element and the skin lubricating member (reference numerals 19 and 21 in Figure 1) and the cutting member 171 can make a reciprocating motion in the shaving direction in the cartridge 170. Both sides of the cartridge 170 are provided with a coupling element 172 that can engage a corresponding coupling element 173 in the cartridge holder 169, so that the

motion of the cable 162 can be transferred through these drive means to the cutting member 171. The cartridge 170 is a disposable part that can be renewed from time to time.
Figure 19 shows the two hinging members 174, which hinging members 174 are connected to each other. In the design as shown in Figure 19, the two hinging members 174 are made out of one piece of plate metal, and part 175 interconnects the two hinging members 174. Because of the elasticity of the material, part 175 functions as a spring, causing the two hinging parts 174 to be pressed apart, so that a wheel 176 at each of the hinging members 174 is rolling over the inner cam surface of the ring 177 that is connected to the output shaft of the motor. The cam surface provides for a reciprocating motion of the two wheels 176 in opposite directions, which causes a reciprocating motion at the ends 178. Each end 178 can be connected to a pulling cable as shown in Figure 17, to transfer the reciprocating motion to the cutting member in the shaving head. The two hinging members 174 can also be made of plastic material by means of an injection moulding operation; This drive mechanism is referred to as the sixth embodiment
Figures 20-22 show the seventh embodiment of the drive mechanism. Figure 20 is a perspective view of the shaving device, wherein a part of the housing 180 of the base portion (handle) is taken away. Figure 21 is a perspective view of the disposable part of the shaving device, and Figure 22 shows that part from its lower side.
Figure 20 shows the housing 180 of the base portion, enclosing the electric
rotary motor 181 and the battery 182. The base portion engages an intermediate part 183,
which intermediate part 183 is connected to the shaving head 184 by means of two arms 185. The ends of the two arms 185 are hinged to the shaving head 184, so that the shaving head 184 can pivot around a pivot axis in the transverse direction (Y-direction), perpendicular to the shaving direction (X-direction).
Figure 22 shows the intermediate part 183 and the shaving head 184 in more detail. In the intermediate part 183 there is a rotary shaft 186 that will be engaged by the output shaft of the rotary motor when the intermediate part 183 is attached to the housing 180 of the base portion. The rotaiy shaft 186 terminates at the location of said pivot axis, where the rotary shaft 186 is provided with a disc 187 having an oval cam surface. The rotary motion of the disc 187 is converted into two opposite reciprocating motions of the push rods 188 extending at the location of the pivot axis, i.e. in the transverse direction (Y-direction). In order to achieve that motion, the ends of the push rods 188 are pushed against the oval cam surface of the disc 187.

The other ends of the push rods 188 are connected to drive means for driving the cutting member 189 in a reciprocating motion in the shaving direction. Cutting member 189 is provided with three cutting blades 190. These drive means are not represented in detail in Figure 22, but they can be similar to the drive means of the third embodiment (shown in Figure 12, reference numeral 137) or of the fourth embodiment (shown in Figure 15, reference numeral 151). Furthermore spring means can be present to push the push rods 188 against the cam surface and/or to urge the cutting member 189 in one X-direction, so that the drive means can push the cutting member in the other X-direction.
As an alternative, the disposable part of the shaving device can be limited to the cutting member 198 or to the shaving head 184, so that a larger part of the drive mechanism is part of the permanent portion of the shaving device, and hence the disposable part is smaller.

WE CLAIM:
1. A device for shaving hairs growing from skin, comprising a base portion having a grip, a shaving head carrying at least one blade-shaped cutting member having at least one cutting edge, and an actuator for effecting a periodical motion of the cutting member relative to the base portion, characterized in that the shaving head is pivotable relative to the base portion about a pivot axis, and the periodical motion of the cutting member is a periodical motion relative to the shaving head.
2. A device as claimed in claim 1, characterized in that the shaving head comprises a skin contact member defining a skin contact surface, the pivot axis extending substantially parallel to the skin contact surface.
3. A device as claimed in claim 1, characterized in that the periodical motion has a motion component which extends substantially parallel to a main cutting direction of the cutting member, the pivot axis extending substantially perpendicularly to the main cutting direction.
4. A device as claimed in claim 3, characterized in that the periodical motion is a reciprocating motion in a direction substantially parallel to the main cutting direction.
5. A device as claimed in claim 3, characterized in that the cutting member comprises a single straight cutting edge, the pivot axis extending parallel to the cutting edge and, seen in the main cutting direction, being arranged in front of the cutting edge.
6. A device as claimed in claim 1, characterized in that the device further comprises a pretensioning member which defines a skin contact pressure exerted by the cutting member on the skin during operation.
7. A device as claimed in claim 6, characterized in that the pretensioning member comprises a mechanical spring mounted to the shaving head and to the base portion for

exerting a pretensioning torque on the shaving head about the pivot axis.
8. A device as claimed in claim 1, characterized in that the actuator is arranged in the base portion and effects the periodical motion of the cutting member via a transmission system which is partially arranged in the base portion and partially arranged in the shaving head.
9. A device as claimed in claim 1, characterized in that the shaving head is releasably mounted to the base portion.
10. A device as claimed in claim 1, characterized in that the cutting member is releasably mounted to the shaving head.
11. A device as claimed in claim 8, characterized in that the base portion comprises a rotary motor having an output shaft driving a rotary transverse shaft through a gear system, wherein said transverse shaft is supported in the shaving head and positioned parallel to the cutting edge, and wherein said transverse shaft is provided with an eccentric disc at each end of it, wherein each eccentric disc is supported in a bearing in a drive : member, so that at least a part of said drive member makes a reciprocating motion in a main cutting direction of the cutting member, wherein the said parts of the drive member engage both ends of the cutting member.
12. A device as claimed in claim 8, characterized in that the base portion comprises a rotary motor having an output shaft driving two transverse members extending parallel to the cutting edge, so that the two transverse members make reciprocating motions parallel to the cutting edge in mutually opposite directions, wherein each transverse member connects said output shaft with the first end of a lever member extending substantially parallel to said output shaft, wherein both lever members are hingedly supported in the base portion so that the second ends of the lever members make opposite reciprocating motions parallel to the cutting edge, which ends engage means for driving the cutting member in a main cutting direction of the cutting member, said means being present in the shaving head.
13. A device as claimed in claim 8, characterized in that the base portion comprises a rotaiy motor having an output shaft driving two hinging members, which

members hinge in a plane through the axis of the output shaft and extend parallel to the cutting edge, wherein a first part of each hinging member is driven by the output shaft in a reciprocating motion substantially in a direction perpendicular to the output shaft, and wherein a second part of the hinging member can make a reciprocating motion substantially parallel to the output shaft, and wherein each of said second parts is connected through drive means to the cutting member in order to drive the cutting member in a reciprocating motion in a main cutting direction of the cutting member.
14. A device as claimed in claim 8, characterized in that the base portion
comprises a rotary motor having an output shaft driving inner cables of ends of two Bowden
cables extending parallel to the cutting edge, so that the inner cables make reciprocating
longitudinal motions relative to the respective outer cables, wherein each inner cable
connects said output shaft to drive means for driving the cutting member in a reciprocating
motion in a main cutting direction of the cutting member.
15. A device as claimed in claim 8, characterized in that the base portion
comprises a rotary motor having an output shaft driving two transverse elements extending
substantially parallel to the cutting edge, wherein the two transverse elements are
substantially positioned in said pivot axis, wherein the rotary motion of the output shaft is
converted into reciprocating motions in opposite directions of the two transverse elements,
and wherein the ends of the transverse elements are connected with means for driving the
cutting member in a main cutting direction of the cutting member.
16. A shaving head suitable for use in a device for shaving hairs growing from
skin, the shaving head carrying at least one blade-shaped cutting member having at least one
cutting edge, the shaving head further comprising a coupling member by means of which the
shaving head can be coupled to a base portion of said device, said base portion comprising a
grip and an actuator for effecting a periodical motion of the cutting member relative to the
base portion, characterized in that the periodical motion of the cutting member is a periodical
motion relative to the shaving head, and the shaving head comprises a pivot member by
means of which, in a condition where the shaving head is mounted to the base portion, the
shaving head is pivotable relative to the base portion about a pivot axis.
Dated this 30th day of June 2006

Documents:

2435-CHENP-2006 PETITIONS.pdf

2435-chenp-2006 abstract-duplicate.pdf

2435-chenp-2006 claims-duplicate.pdf

2435-CHENP-2006 CORRESPONDENCE OTHERS.pdf

2435-CHENP-2006 CORRESPONDENCE PO.pdf

2435-chenp-2006 description (complete)-duplicate.pdf

2435-chenp-2006 drawings-duplicate.pdf

2435-CHENP-2006 FORM 1.pdf

2435-CHENP-2006 FORM 13.pdf

2435-CHENP-2006 FORM 3.pdf

2435-CHENP-2006 FORM 5.pdf

2435-chenp-2006-abstract.pdf

2435-chenp-2006-claims.pdf

2435-chenp-2006-correspondnece-others.pdf

2435-chenp-2006-description(complete).pdf

2435-chenp-2006-drawings.pdf

2435-chenp-2006-form 1.pdf

2435-chenp-2006-form 26.pdf

2435-chenp-2006-form 3.pdf

2435-chenp-2006-form 5.pdf

2435-chenp-2006-others.pdf

2435-chenp-2006-pct.pdf

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Patent Number

229783

Indian Patent Application Number

2435/CHENP/2006

PG Journal Number

13/2009

Publication Date

27-Mar-2009

Grant Date

20-Feb-2009

Date of Filing

03-Jul-2006

Name of Patentee

KONINKLIJKE PHILIPS ELECTRONICS N.V

Applicant Address

Groenewoudseweg 1, NL-5621 BA Eindhoven,

Inventors:

#	Inventor's Name	Inventor's Address
1	STEUNENBERG, Roelof	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
2	VAN DER VLIS, Peter, H	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
3	VAN EIBERGEN SANTHAGENS, Robert, A	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
4	HANSEN, Marinus, C	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
5	PASTOORS, Marc, A	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
6	WEVERS, Dirk, H	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
7	KOSTER, Aafje, G	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
8	RODDEMAN, Gerardus, J., H	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
9	OPHOF, Richard, P	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
10	PAAUW, Hendrik, K	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
11	RAAP, Gerben	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
12	LAFARRE, Raymond, W., L	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,
13	MULLER, Johannes, C., A	c/o Prof. Holstlaan 6, NL-5656 AA Eindhoven,

PCT International Classification Number

B26B21/38

PCT International Application Number

PCT/IB2004/052622

PCT International Filing date

2004-12-01

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	03104488.6	2003-12-02	EUROPEAN UNION
2	04101733.6	2004-04-26	EUROPEAN UNION