Title of Invention	CUTTING TOOL ASSEMBLY
Abstract	This invention relates to a cutting tool assembly (1) comprising a cutting head (2,102) and a toot shank (4,104) having a longitudinal axis (6,106) and at least two chip flutes (8a,10a ,8b,10b) extending from the cutting head (2,102) to a rear of the tool shank (4,104). The cutting head (2,102) has a cutting portion (12,112) adjacent a leading end (13,113) and a cutting head mounting portion (14,114) adjacent a trailing end (15,115) thereof. The cutting head mounting portion (14,114) has a pair of diametrically oppositely disposed cutting head coupling portions (20,120). The tool shank (4,104) has a cutting head receiving portion (40,140) formed at a front face thereof and comprising a pair of diametrically oppositely disposed tool shank coupling portions (44,144) each extending between the two flutes (8b,10b) and having a stepped configuration. The tool shank (4,104) and cutting head coupling portions (20,120) each have a support surface (22,24,48,50) oriental substantially perpendicular to the longitudinal axis (6) and a torque transmission wall (26,52) oriented substantially transversely to the support surface and generally radially with respect to the longitudinal axis (6). The cutting head (2,102) is circumferentially co-extensive with the tool shank (4,104) and the cutting head coupling portions (20,120) mate in shape and dimensions the tool shank coupling portions (44, 144), each coupling portion having a lowered base surface (22,50) adjacent one of the flutes (8a, 10a), a raised base surface (24,48) adjacent the other flute and a side wall (26, 152) there between, at least one of the base surfaces constituting the support surface and the side wall constituting the torque transmission wall (26,152).

Title of Invention

CUTTING TOOL ASSEMBLY

Abstract

This invention relates to a cutting tool assembly (1) comprising a cutting head (2,102) and a toot shank (4,104) having a longitudinal axis (6,106) and at least two chip flutes (8a,10a ,8b,10b) extending from the cutting head (2,102) to a rear of the tool shank (4,104). The cutting head (2,102) has a cutting portion (12,112) adjacent a leading end (13,113) and a cutting head mounting portion (14,114) adjacent a trailing end (15,115) thereof. The cutting head mounting portion (14,114) has a pair of diametrically oppositely disposed cutting head coupling portions (20,120). The tool shank (4,104) has a cutting head receiving portion (40,140) formed at a front face thereof and comprising a pair of diametrically oppositely disposed tool shank coupling portions (44,144) each extending between the two flutes (8b,10b) and having a stepped configuration. The tool shank (4,104) and cutting head coupling portions (20,120) each have a support surface (22,24,48,50) oriental substantially perpendicular to the longitudinal axis (6) and a torque transmission wall (26,52) oriented substantially transversely to the support surface and generally radially with respect to the longitudinal axis (6). The cutting head (2,102) is circumferentially co-extensive with the tool shank (4,104) and the cutting head coupling portions (20,120) mate in shape and dimensions the tool shank coupling portions (44, 144), each coupling portion having a lowered base surface (22,50) adjacent one of the flutes (8a, 10a), a raised base surface (24,48) adjacent the other flute and a side wall (26, 152) there between, at least one of the base surfaces constituting the support surface and the side wall constituting the torque transmission wall (26,152).

Full Text	-1A- FIELD OF THE INVENTION The present invention refers to a tool assembly comprising at least two members releasably coupled together in such a manner as to enable transfer of a rotary torque from one member to another. The invention particularly refers to a rotary cutting tool assembly for use in such operations as drilling, milling and the like. BACKGROUND OF THE INVENTION One example of a rotary cutting tool assembly having a coupling arrangement of the above-specified kind is disclosed in EP 0742065. The assembly comprises first and second assembly components having interfitting male and female coupling members formed at their interacting faces, the coupling members having radially directed arm portions for torque transmission, and a centering portion located therebetween. The coupling members are coaxially coupled together by a fastening screw. The use of fastening screws in cutting tool assemblies of the above kind weakens the cutting tool and puts rather severe limitations on the miniaturization of the tool when rotary cutting tool assemblies of small diameters are concerned, since these tools have axially extending chip flutes, and, consequently, do not have a cross-sectional area sufficiently large and a tool body sufficiently strong to accommodate appropriate fastening screws. EP 0118 806 discloses a drilling tool assembly comprising a cylindrical tool shank formed with two helical chip flutes extending generally along a longitudinal axis thereof and a drilling head removably mounted thereto in a self-holding manner not requiring a fastening screw. -2- Thus, the drilling head comprises two diametrically oppositely disposed substantially planar cutting portions in the form of cutting plates and the tool shank has two diametrically oppositely disposed and radially oriented recesses formed at side surfaces of the chip flutes, the recesses mating with and being capable of receiving.the cutting plates of the drilling head. The cutting plates and the recesses have narrow base surfaces oriented substantially perpendicular to the longitudinal axis of the tool and wide side walls oriented transversely to the base surfaces and generally radially with respect to the longitudinal axis. The drilling tool assembly is further provided with fixation means in the form of a male fixation member axially protruding from the drilling head and capable of being received within a correspondingly shaped female fixation member formed in the tool holder. The fixation members are concentric with the longitudinal axis of the tool shank and have a radial extension substantially less than that of the cutting head and the tool shank. The fixation members widen in the direction away from the drilling head. The drilling head is mounted in the tool shank by the insertion of the cutting plates in a position approximately in the middle of the flutes and rotating the drilling head in the direction counter to the drill rotation direction until the base surfaces of the cutting plates are fully supported by corresponding base surfaces of the recesses in the tool shank and the side walls of the cutting plates abut corresponding side walls of the recesses. During a cutting operation, the base surfaces of the drilling head and the recesses provide for the support of the drilling head against the cutting forces acting thereon, and their side walls function as torque transmission surfaces. The interaction of peripheral surfaces of the fixation members ensures the centering of the assembly and prevents the drilling head from being detached from or pulled out of the tool shank when the cutting tool is withdrawn from a workpiece being machined. It should, however, be noted that the drilling head with a planar configuration as above is rather weak, especially when employed under torsion conditions. Furthermore, tools with cutting heads having a small -3 - thickness relative to the cross-sectional area of their tool shank are not sufficiently stable. For the drilling head of the above planar design to be stronger and for the assembly with the above narrow support surfaces to be more stable, the side walls of the cutting plates and the tool shank recesses usually have an axial height substantially greater than the thickness of the drilling head body. This renders the tool assembly design described above hardly applicable to small and, particularly, to miniature cutting tools. It is the object of the present invention to provide a new rotary cutting tool assembly which has advantages in the above respect. SUMMARY OF THE INVENTION In accordance with one aspect of the present invention, there is provided a rotary cutting tool assembly comprising a cutting head and a tool shank having a longitudinal axis and at least two chip flutes extending from said cutting head to a rear of the tool shank; said cutting head having a cutting portion adjacent a leading end and a cutting head mounting portion adjacent a trailing end thereof, said cutting head mounting portion having a pair of diametrically oppositely disposed cutting head coupling portions; said tool shank having a cutting head receiving portion formed at a front face thereof and comprising a pair of diametrically oppositely disposed tool shank coupling portions each extending between said two flutes and having a stepped configuration, the tool shank coupling portions being adapted to receive said tool shank coupling portions; said tool shank and cutting head coupling portions each having a support surface oriented substantially perpendicular to said longitudinal axis and a torque transmission wall oriented substantially transversely to said support surface and generally radially with respect to said longitudinal axis; said cutting head and said tool shank having male and female fixation members which are concentric with the tool assembly; characterised in that -4- the cutting head is circumferentially co-extensive with the tool shank and the cutting head coupling portions mate in shape and dimensions the tool shank coupling portions, each coupling portion having a lowered base surface adjacent one of said flutes, a raised base surface adjacent the other flute and a side wall therebetween, at least one of the base surfaces constituting said support surface and said side wall constituting said torque transmission wall. In accordance with another aspect of the present invention, there is provided a cutting head for use in a rotary cutting tool having a tool shank with a longitudinal axis and at least two chip flutes extending therealong, said cutting head being adapted for mounting at a front face of said tool shank coaxially therewith; said cutting head having a cutting portion adjacent a leading end and a cutting head mounting portion adjacent a trailing end thereof, said cutting head mounting portion having a pair of diametrically oppositely disposed cutting head coupling portions; said cutting Head coupling portions each having a support surface oriented substantially perpendicular to said longitudinal axis and a torque transmission wall oriented substantially transversely to said support surface and generally radially with respect to said longitudinal axis; said cutting head having a fixation member which is concentric therewith; characterised in that the cutting head is circumferentially co-extensive with the tool shank and each cutting head coupling portion has a lowered base surface adjacent one of said flutes, a raised base surface adjacent the other flute and a side wall therebetween, at least one of the base surfaces constituting said support surface and said side wall constituting said torque transmission wall. Preferably, the side walls of the cutting head and the tool shank coupling portions have an axial dimension which is substantially less than a distance between radially outermost points of said two chip flutes at said front face of the tool shank. Still more preferably, the axial dimension of -5 - said side walls of the cutting head and the tool shank coupling portions does not exceed, and even may be substantially less than half of, said distance between the radially outermost points of the two chip flutes. It is also preferable that the axial dimension of said side walls is less than a distance from the lowered base surfaces of the cutting head coupling portions to said leading end thereof. Preferably, the cutting head is formed with chip flute sections which merge continuously with the chip flutes formed in the tool shank. Thereby, the entire assembly has a complete smooth design and the continuous chip flutes thereof enable very smooth chip evacuation. Preferably, the lowered base surfaces of the cutting head coupling portions belong to recesses formed at the trailing end of the cutting head, and the raised base surfaces of the tool shank coupling portions belong to protrusions formed at the front face of the tool shank, the recesses and the protrusions being each bound, on their one side, by an adjacent flute, on their other side, by said side wall and, adjacent said longitudinal axis, by a central wall merging with said side wall. Preferably, the side and central walls merge with each other via a rounded corner. In a first embodiment of the present invention, said central walls of the protrusions and'the recesses constitute peripheral walls of respectively said male and female fixation members, the peripheral walls of the coupling portions of each fixation member having a central base surface therebetween. In a second embodiment of the present invention, said male fixation member protrudes from the trailing end of the cutting head and said female fixation member is recessed with respect to the front face of the tool shank. The protruding and recessed fixation members each has peripheral walls and a central base surface therebetween. In each of the above embodiments, it is preferable that said peripheral walls diverge in the direction away from the cutting head leading end. Preferably, these peripheral walls are in the form of conical arcs each having an axis which may or may not coincide with said longitudinal axis of the cutting tool assembly. -6- The tool assembly may further be provided with locking means. Preferably, the locking means comprise two diametrically oppositely disposed flexible cylindrical locking pins projecting axially from the central base surface of the female fixation member and oriented substantially co-directionally with the peripheral walls of the male and female fixation members, and two locking receptacles in the form of arcuate depressions formed in the side surfaces of the male fixation member and adapted to receive therein said locking pins. The tool assembly according to the present invention may further be provided with a device for assembling and dissembling thereof. The assembling device comprises an elongated cylindrical cavity of a diameter corresponding to the diameter of said cutting tool, at least said cavity being made of an elastic material, the cavity comprising a cutting head holding section and a tool shank receiving section, which sections are capable of resiliently encompassing the cutting head and the cutting head receiving portion of the tool shank, the cutting head holding section having the shape complementary to an outer configuration of the cutting head, whereby the rotation thereof relative to the said assembling device is avoided, and being provided with means preventing the cutting head from falling out of the cutting head holding section of the assembling device. The coupling arrangement according to the present invention allows the cutting head to have a strong wide trailing end with a maximal available cross-sectional area and short side, torque transmission walls, whereby the stability of the cutting tool assembly is improved. This renders the coupling arrangement of the present invention particularly useful for miniature cutting tool assemblies. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS For a better understanding of the present invention and to show how the same may be carried out in practice, reference will now be made to the accompanying drawings, in which -7- Fig. 1 is an isometric view of a cutting tool assembly, before its assembling, according to one embodiment of the present invention; Fig. 2 is an isometric bottom view of a cutting head of the cutting tool assembly shown in Fig. 1; Fig. 3 is a plan bottom view of the cutting head shown in Fig. 2; Fig. 4 is an isometric partial view of a tool shank of the cutting tool assembly shown in Fig. 1; Fig. 5 is a front view of the tool shank shown in Fig. 4; Fig. 6 is an isometric view of the cutting tool assembly as shown in Fig. 1, at an initial stage of its assembling; Fig. 7 is an isometric view of the cutting tool assembly as shown in Fig. 1, when assembled; Fig. 8 is a cross-sectional view of the cutting tool assembly shown in Fig. 7; Fig. 9 is an isometric view of a cutting tool assembly, before its assembling, according to another embodiment of the present invention; Fig. 10 is an isometric bottom view of a cutting head of the cutting tool assembly shown in Fig. 9; Fig. 11 is an partial isometric view of a tool shank of the cutting tool assembly shown in Fig. 9; Fig. 12 is a cross-sectional view of the cutting tool assembly shown in Fig. 9, when assembled, taken across protrusions 156; Fig. 13 is an isometric partially cross-sectional view of a cutting tool assembly shown in Fig. 9, at an initial stage of its assembling, taken across pins 220; and Figs. 14 and 15 illustrate different embodiments of an assembling device for use with the cutting tool shown in Figs. 9 to 13. DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary cutting tool assembly 1 according to a first embodiment of the present invention is illustrated in Fig. 1. The cutting tool assembly -8- 1 comprises a cutting head 2 and a tool shank 4 having a longitudinal axis 6 and 180°-rotational symmetry with respect to the longitudinal axis 6. The cutting head 2 and the tool shank 4 have mating circumferential shapes and dimensions and are formed with respective chip flute sections 8a, 10a and 8b, 10b such that, when the cutting tool is assembled, the sections 8a and 8b and the sections 10a and 10b form continuous, preferably helical, flutes 8 and 10 which extend from the cutting head 2 to a rear of the tool shank 4. As illustrated in Figs. 2 and 3, the cutting head 2 has a cutting portion 12 adjacent the cutting head leading end 13 and a cutting head mounting portion 14 adjacent the cutting head trailing end 15. The cutting portion 12 of the cutting head will not be described herein since it does not constitute the subject matter of the present invention. However, it should be noted that the cutting portion 12 of the cutting head may have any appropriate design. The cutting head mounting portion 14 comprises a pair of diametrically oppositely disposed cutting head coupling portions 20 each extending between the chip flute sections 8a and 10a and, as illustrated in Fig. 3, defined by a distance D between radially outermost points 21' and 21" thereof. As seen in Fig. 2, each cutting head coupling portion 20 has a stepped configuration with a lowered base surface 22 adjacent one chip flute section 8a, 10a, a raised base surface 24 adjacent the other chip flute ] section 10a, 8a, a side wall 26 therebetween and a central wall 28 merging with the side wall 26 via a rounded corner 27, the lowered base surface 22 and the side and central walls 26 and 28 defining therebetween a recess 29. The cutting head coupling portions 20 have a central base surface 30 therebetween. As seen in Fig. 2, the lowered, raised and central base surfaces 22, 24 and 30 of the cutting head are substantially planar and are oriented generally perpendicular to the longitudinal axis 6, and the side wall 26 and the central wall 28 are co-directional with the longitudinal axis 6. As seen in Fig. 3, the side wall 26 extends generally radially and the central wall 28 -9- extends circumferentially with respect to the longitudinal axis 6. It should be understood that the side wall 26 does not necessarily need to be a planar surface but rather may be in the form of a curved plane, only a portion of which extends radially. Furthermore, the side wall 26 may not extend exactly in the radial direction but may rather be oriented at a relatively small angle thereto. An axial dimension d (Fig. 2) of the side wall 26 of each cutting head coupling portion 20 is substantially less than the distance D (Fig. 3) between the radially outermost points 21' and 21" of the respective chip flutes sections 8a and 10a. The axial dimension d does not exceed and, preferably, is substantially less than half of the distance D and is less than a height H (Fig. 2) of the cutting head 2 measured between the leading end 13 and the lowered base surfaces 24 thereof. As may be seen in Figs. 1, 2, 6 and 7 and best shown in Fig. 8, the central walls 28 are in the form of conical arcs diverging in the direction away from the cutting head leading end 13, the conical arcs having axes (not shown) which may or may not coincide with the longitudinal axis 6. As shown in Figs. 4 and 5, the tool shank 4 has a front face 40 with a cutting head receiving portion 42 formed thereon. The cutting head receiving portion 42 has diametrically oppositely disposed tool shank coupling portions 44 mating in shape and dimensions with the cutting head coupling portions 20. Thus, each tool shank coupling portion 44 comprises a raised base surface 48, a lowered base surface 50, a side wall 52 therebetween and a central wall 54 merging with the side wall 52. The raised base surface 48 and the side and central walls 52 and 54 define between them protrusions 56 mating with and adapted to be received in the recesses 29 of the cutting head mounting portion 14. The tool shank coupling portions 44 have a central base surface 60 therebetween. The raised, lowered and central base surfaces 48, 50 and 60 and the side and central walls 52 and 54 of the tool shank coupling portions 44 correspond in orientation and dimensions to the respective lowered, raised and central - 10- base surfaces 22, 24 and 30 and side and central walls 26 and 28 of the cutting head coupling portions 20,(as shown in Fig 2). As seen in Figs. 2, 3 and 4, the cutting head and the tool shank are further provided with respective male and female guiding members 64 (Fig. 2) and 66 (Fig. 4), which may also be arranged vice versa, for the simplification of mounting the cutting head 2 to the tool shank 4. As illustrated in Fig. 6, the cutting head mounting portion 14 of the cutting head 2 is mounted to the cutting head receiving portion 42 of the tool shank 4 by the transverse insertion of the cutting head coupling portions 20 between the protrusions 56 of the tool shank coupling portions 44, and rotating the cutting head 2 in the direction A (counter the rotation direction of the cutting tool).until the side walls 26 of the cutting head coupling portions 20 abut the corresponding side walls 52 of the tool shank coupling portions 44 and the protrusions 56 of the latter coupling portions 44 are fully received in the recesses 29 of the former coupling portions 20. The cutting tool 1 described above, as assembled, is illustrated in Figs. 7 and 8. During a cutting operation, the axial support of the cutting head 2 in the tool shank 4 is provided by the contact of the lowered and central base surfaces 22 and 30 of the cutting head 2 with the respective raised and central base surfaces 48 and 60 of the tool shank 4. The side walls 26 and 52 of, respectively, the cutting head 2 and the tool shank 4 function as torque transmission surfaces. The central walls 28 and 54 of, respectively, the cutting head 2 and the tool shank 4, which diverge in the direction away from the leading end 13 of the cutting head 2, interact in a dove-tail manner, whereby an accurate fixation and centering of the cutting head in the tool shank is provided. Such a fixation arrangement prevents the drilling head from being detached from or pulled out of the tool shank when the cutting tool is withdrawn from a workpiece being machined. Figs. 9 to 14 illustrate a cutting tool assembly 101 according to a second embodiment of the present invention, in which a coupling arrangement is generally similar to that of the cutting tool assembly 1 illustrated in Figs. 1 to 8, and which differs therefrom mainly in the design of the fixation -11 - arrangement. Therefore, in the description of the cutting tool assembly 101 hereinbelow, only those parts thereof will be referred to, which are relevant to the description of the fixation arrangement. As seen in Fig. 9, the cutting tool assembly 101 comprises a cutting head 102 and a tool shank 104 having a longitudinal axis 106 and two chip flutes (not designated). The cutting head 102 shown separately in Fig. 10, has a cutting portion 112 adjacent the cutting head leading end 113 and a cutting head mounting portion 114 adjacent the cutting head trailing end 115. The cutting head mounting portion 114 comprises a pair of diametrically oppositely disposed cutting head coupling portions 120 each having a recess 129. The tool shank 104 shown in Fig. 11 has a front face 140 with a cutting head receiving portion 142 formed thereon. The cutting head receiving portion 142 has tool shank coupling portions 144 with protrusions 156 mating in shape and dimensions with the recesses 129 of the cutting head coupling portions 120. As seen in Figs. 9, 10 and 11, the cutting tool assembly 101 is provided with male and female fixation members 200 and 210 formed respectively in the cutting head 102 and the tool shank 104 concentrically therewith and having a radial dimension substantially less than a radial dimension of the cutting head and the tool shank. The male fixation member 200 of the cutting head 102 protrudes from the trailing end 115 thereof and the female fixation member 210 of the tool shank 104 is recessed with respect to the front face 140 thereof. As shown in Figs. 10 and 11, the male and female fixation members 200 and 210 have respective peripheral walls 128 and 152 and central base surfaces 130 and 154 therebetween, which have the shape and interact in the fashion similar to that of the respective central walls 28 and 52 and central base surfaces 30 and 54 of the cutting head coupling members 20 and the tool shank coupling members 44 of the cutting tool assembly 1. Thus, as seen in Fig. 12, the peripheral walls 128 and 152 of - 12- the male and female fixation members 200 and 210 diverge away from the leading end 113 of the cutting head 102 and cooperate in a dove-tail manner. The cutting tool assemblies 1 and 101 according to the present invention may be provided with locking means. One example of such locking means, as applied to the cutting tool assembly 101, will be described hereinbelow with reference to Figs. 10, 11 and 13. The locking means comprise two cylindrical locking pins 220 (Figs. 11 and 13) projecting axially from the central base surface 154 of the female fixation member 200 of the tool shank 104 and disposed adjacent the peripheral walls 152 thereof and two corresponding cylindrical locking receptacles 222 (Figs. 10 and 13) formed in the peripheral walls 128 of the male fixation member 200 of the cutting head 102 and adapted to receive therein the locking pins 220. The locking pins 220 are inclined towards the longitudinal axis 106 such as to be generally co-directional with the diverging peripheral walls 128 and 152 of the respective male and female fixation members 200 and 210. As seen in Fig. 13, the locking pins 220 are arranged in the tool shank 104 in a flexible manner which, in the described embodiment, is obtained by mounting each of the locking pins 220 in an elongated bore 230 formed in the tool shank 104 adjacent the peripheral walls 152 thereof and having two bore sections of different radial dimensions so that a lower portion 232 of the pin 220 fits snugly in a lower narrow section 236 of the bore 230, and an upper section 240 of the pin 220 is surrounded by an upper wide section 242 of the bore 230, being slightly radially bendable therein. The elongated bore 230 is disposed adjacent the peripheral walls 152 of the female fixation member 210 in such a manner that its upper wide portion 242 constitutes a partial continuation of a cylindrical depression 246 formed in the peripheral walls 152. The upper wide portion 242 of the bore 230 and the cylindrical depression 246 preferably have a radially elongated cross-sectional shape so as to enable required radial bending of the locking pins 220. - 13 - Thus, when during assembling of the cutting tool 101, the-cutting head 102 is inserted in the cutting head receiving portion 142 of the tool shank 104 and rotated in the direction A, the peripheral walls 128 of the male fixation member 200 bias the pins 220 radially outwardly towards the peripheral walls 152 of the female fixation member 210. Upon the abutment of the side walls 26 of the cutting head coupling portions 20 against the side walls 52 of the tool shank coupling portions 44, the rotation of the cutting head 102 is terminated and the locking pins 220 enter the locking receptacles 222. Preferably, the orientation of the locking pins 220 is such that they bias associated surfaces of the receptacles 222 and, consequently, the cutting head in the direction A. Thereby, reliable locking of the cutting head 102 in its mounting position is obtained. The cutting tool assemblies described above may be further provided with an assembling device. Thus, Figs. 14 and 15 illustrate two examples of such a device for use with the cutting tool assembly 101. As seen, the assembling device 300 (Fig. 14) and 400 (Fig. 15) each have an elongated cylindrical cavity 310, 410 of a diameter corresponding to the diameter of the cutting tool 101. The assembling devices 300 and 400, or at least their cavities 310 and 410, are made of an elastic material and comprise a cutting head holding section 320, 420 and a tool shank receiving section 330, 430, which are capable of resiliently encompassing the cutting head 102 and the cutting head receiving portion 142 of the tool shank 104. The cutting head holding sections 320 and 420 of the cavities 310 and 410 have the shape complementary to an outer configuration of the cutting head 102 and, consequently, comprise convex portions 340 and 440 which are capable of entering the chip flute sections of the cutting head, whereby the rotation thereof relative to the assembling devices 300 and 400 is avoided. The assembling devices 300 and 400 may be further provided with means preventing the cutting head from falling out of the cutting head holding sections 320 and 420 of the devices. Thus, in the assembling device 300 shown in Fig. 14, these means are in the form of flexible elements 350 and, - 14- in the assembling device 400 shown in Fig. 15, these means are constituted by the convex elements 440 formed with an appropriate shape and dimensions. Alternatively, or in addition to the above elements 350 and 440, the cutting head holding sections 320 and 420 of the cylindrical cavities 310 and 410 may have a diameter which is slightly less than that of the cutting head 102 to enable the press-seating thereof in the corresponding cutting head holding section. When the cutting tool 101 is dissembled, the cutting head is released from the respective assembling device either by pushing it out of the device 300 at a rear end 360 thereof (Fig. 14), or by pulling it out of the device 400 at a front end 460 thereof. The cutting tool assembly of the present invention and components thereof may have alternative designs comprising features different from those described above and shown in the drawings. - 15 - LIST OF REFERENCE NUMERALS 1 cutting tool assembly in Figs. 1 to 8 2 cutting head 4 tool shank 6 longitudinal axis 8a, 10a chip flute sections of the cutting head 8b, 10b chip flute sections of the tool shank 12 cutting portion of the cutting head 13 leading end of the cutting head 14 cutting head mounting portion 15 trailing end of the cutting head 20 cutting head coupling portions 21', 21" radially outermost points of the chip flute sections 8a and 10a 22 lowered base surface of the cutting head coupling portion 24 raised base surface of the cutting head coupling portion 26 side wall of the cutting head coupling portion 27 rounded corner 28 central wall of the cutting head coupling portion 29 recess of the cutting head coupling portion 30 central base surface between the cutting head coupling portions 40 front face of the tool shank 42 cutting head receiving portion of the tool shank 44 tool shank coupling portions 48 raised base surface of the tool shank coupling portion 50 lowered base surface of the tool shank coupling portion 52 side wall of the tool shank coupling portion 54 central wall of the tool shank coupling portion 56 protrusion of the tool shank coupling portion 60 central base surface between the tool shank coupling portions 64, 66 male and female guiding members 101 cutting tool assembly in Figs. 9 to 13 102 cutting head 101 - 16- 104 tool shank 106 longitudinal axis 106 112 cutting portion of the cutting head 113 cutting head leading end 114 cutting head mounting portion 115 cutting head trailing end 120 cutting head coupling portion 128 peripheral walls of the male fixation member 129 recess of the cutting head coupling portion 130 central base surface of the male fixation member 140 front face of the tool shank 142 cutting head receiving portion of the tool shank 144 tool shank coupling portions 152 peripheral walls of the female fixation member 154 central base surface of the female fixation member 156 protrusions of the tool shank coupling portions 200 male fixation member of the cutting head 210 female fixation member of the tool shank 220 locking pins 222 locking receptacles 230 elongated bores 232 lower portion of the pin 220 236 lower, narrow section of the bore 230 240 upper section of the pin 220 242 upper wide section of the bore 230 246 cylindrical depression formed in the peripheral walls 152 300 assembling device shown in Fig. 14 310 cavity of the assembling device 300 320 cutting head holding section of the assembling device 300 330 tool shank receiving section of the assembling device 300 340 convex portions of the assembling device 300 350 flexible elements of the assembling device 300 - 17- 360 rear end of the assembling device 300 400 assembling device shown in Fig. 15 410 cavity of the assembling device 400 420 cutting head holding section of the assembling device 400 430 tool shank receiving section of the assembling device 400 440 convex portions of the assembling device 400 460 front end of the assembling device 400 WE CLAIM: 18. 1. A cutting tool assembly for rotary cutting operations comprising a dismantable cutting tool (1); and a device (300, 400) for assembly and disassembly of said cutting tool (1), the cutting tool constituting of a replaceable cutting head ( 2, 102) and a tool shank, (4, 104) having a common longitudinal axis ( 6, 106) and mating peripheral surfaces ( 26, 52, 28, 54, 128, 152), said cutting head ( 2, 102) having a cutting portion ( 12, 112) adjacent a leading end ( 13, 113) and a cutting head mounting portion ( 14, 114) adjacent a trailing end (15, 115) thereof, and said tool shank ( 4, 104) having a cutting head receiving portion (42, 142) formed at a front face ( 40, 140) thereof, said cutting head mounting portion ( 14, 114) and the cutting head receiving portion (42, 142) of the tool shank ( 4, 104) each having two coupling portions, the cutting head couplings portions ( 20, 120) and the tool shank coupling portions (44, 144) being bound by* said peripheral surfaces ( 26, 52, 28, 54) and having stepped configurations mating in shape and dimensions; each coupling portion ( 20, 44) having a pair of base surfaces ( 22, 24, 48, 50) of which one surface is raised ( 24, 48) and the other one is lowered ( 22, 50), the base surfaces extending transversely to said longitudinal axis (6) and the lowered surface (22) of each coupling portion (20)of the cutting head (2) and the raised surface (48) of each coupling portion (44) of the tool shank (4) being adapted for providing an axial support of the cutting head (2) in the tool shank (4), a torque transmission wall (26, 52) extending from a corresponding peripheral surface in a radial direction relative to said longitudinal axis (6) and separating and being oriented transversely to the raised (22) and lowered based surfaces (24), and a fixation wall (28, 54) disposed adjacent and extending transversely to the torque transmission wall (26,52) and circumferentially relative to said longitudinal axis (6), the fixation wall (28) of each cutting head coupling portion (20) sloping towards the longitudinal axis (6) in the direction of said leading end (13) of the cutting head (2) and having an angular extension (d) smaller than a corresponding angular distance (D) between adjacent extremities ( 21', 21") of the fixation walls of two different tool shank coupling portions (8a, 10a), the cutting tool (1) being assembled by initially disposing the cutting head mounting portion ( 14) in such a manner relative to the cutting head receiving portion ( 42) as to insert the fixation walls ( 28) of the cutting head coupling portions ( 20) between the respective fixation walls ( 54) of the tool shank coupling portions (44), and subsequently rotating the cutting head (2) relative to the tool shank (4) until the cutting head coupling portions ( 20) fully overlie the corresponding tool shank coupling portions (44) with their base surfaces ( 22, 24, 48, 50) and torque transmitting walls ( 26, 52) abutting each other and their fixation walls ( 28, 54) co-axially interacting in an interlocking male-female fashion, providing thereby the self-clamping of the cutting head (2) on the tool shank (4). 19. 2. A cutting tool assembly as claimed in claim 1, wherein said lowered base surface (22) of each coupling portion (20) of the cutting head (2) and said raised base surface portion (48) of each coupling portion (44) of the tool shank (4) are radially co-extensive with said torque transmission wall ( 26, 52). 3. A cutting tool assembly as claimed in claim 1, wherein the lowered base surfaces (22) of the cutting head coupling portions (20) belong to recesses (29) formed at the trailing end (15) of the cutting head (2), and the raised base surfaces (48) of the tool shank coupling portions (44) belong to protrusions (56) formed at the front face (40) of the tool shank (4), the depth (d) of the recesses (29) and the height (H) of the protrusions (56) being defined by the axial extension of said torque transmission wall ( 26, 52) which extension is less than the radial extension (D) of the torque transmission wall (26,52). 4. A cutting tool assembly as claimed in claim 1, wherein said tool shank (4) is formed with two chip flutes (8b, 10b). 5. A cutting tool assembly as claimed in claim 4, wherein said cutting head (2) is formed with chip flute sections (8a, 10a) which emerge continuously with the chip flutes ( 8b, 10b) formed in the tool shank (4). 6. A cutting tool assembly as claimed in claim 5, wherein said coupling portion (20,44) of said cutting tool (1) extends between the two flutes so that its lowered surface (22) is disposed adjacent one of the flutes (8a, 10a) and its raised surface (24) is disposed adjacent the other flute (10a, 8a). 7. A cutting tool assembly as claimed in claim 3, wherein said tool shank (4) is formed with chip flutes ( 8a, 10a, 8b, 10b) and said cutting head (2) is formed with chip flute sections which merge continuously with the chip flutes (8b, 10b) formed in the tool shank (2), the recesses (24) and the protrusions (56) of the respective cutting head coupling portions (20 ) and tool shank coupling portions (44) being each bound, on their one side, by an adjacent flute (8a,10a) on their side, by said torque transmission wall (26, 52). 8. A cutting tool assembly as claimed in any one of claims 1 to 7, wherein said cutting tool (1) is adapted for use in rotary operations. 9. A cutting tool assembly as claimed in claim 8, wherein said cutting tool (1) is adapted for use in drilling operations. 2. 20. 10. A cutting tool assembly as claimed in claim 1, wherein said replaceable cutting head mounts on said tool shank along a longitudinal axis thereof. 11. A cutting tool assembly as claimed in claim 10, wherein said tool shank having a front cutting head receiving portion formed with at least two coupling portions each bound by a tool shank peripheral surface and formed with a base surface and formed with a base surface, a torque transmission wall and a fixation wall; 12. A cutting tool assembly as claimed in claim 11, wherein said cutting head having a peripheral surface mating with said tool shank peripheral surface, a cutting portion adjacent a leading end and a cutting head mounting portion adjacent a trailing end thereof, the cutting head mounting portion being formed with at least two coupling portions bound by said peripheral surface of the cutting head; 13. A cutting tool assembly as claimed in claim 12, wherein each coupling portion of the cutting head having a base surface extending transversely to said longitudinal axis and adapted for participating in an axial support of the cutting head in the tool shank, a torque transmission wall extending in a generally radial direction relative to said longitudinal axis and oriented transversely to said base surface, and a fixation wall disposed adjacent and extending transversely to the torque transmission wall and circumferentially relative to said longitudinal axis, the fixation wall of each cutting head coupling portion having an angular extension smaller than a corresponding angular extension smaller than a corresponding angular distance between adjacent extremities of the fixation walls of two different tool shank coupling portions. 14. A cutting tool assembly as claimed in claim 12, wherein said lowered base surface of each coupling portion of the cutting head are radially co-extensive with said torque transmission wall. 15. A cutting tool assembly as claimed in claim 12, wherein a body of said cutting head is solid. 16. A cutting tool assembly as claimed in claim 13, wherein said lowered base surface and said fixation wall of each coupling portion of the cutting head are equidistant from said longitudinal axis. 17. A cutting tool assembly as claimed in claim 12, wherein said cutting head is formed with a fixation member extending axially from the base surfaces thereof, and said fixation walls of the coupling portions of the cutting head are constituted by peripheral surfaces of said fixation member. 18. A cutting tool assembly as claimed in claim 12, wherein the torque transmission and fixation walls of each coupling portion are parts of a continuous step oriented 18. 21. transversly to said base surfaces and extending from one of said flutes to the peripheral surface of the coupling portion. 19. A cutting tool assembly as claimed in claims 12 and 13, wherein said torque transmission wall is obliquely inclined to said base surfaces. 20. A cutting tool assembly as claimed in claim 1, wherein said device (300, 400) for assembly and disassembly of said cutting tool (1) comprises an elongated cylindrical cavity (310, 410) of a diameter corresponding to the diameter of said cutting tool (2, 102, 4, 104) at least said cavity (310) being made of an elastic material, the cavity (310) comprising a cutting head holding section (320, 420), and a tool shank receiving section (330, 430), which sections are capable of resiliently encompassing the cutting head (2) and the cutting head receiving portion ( 42, 142) of the tool shank ( 4, 104), the cutting head holding section having the shape complementary to an outer configuration of the cutting head (2, 102), whereby the rotation thereof relative to the assembling device (300, 400) is avoided, and being provided with means (350, 440) preventing the cutting head (2, 102) from falling out of the cutting head holding section (320) of the device (300,400) 21. A cutting tool assembly as claimed in claim 1, wherein the fixation walls of the coupling portions of said tool shank and said cutting head are provided with locking means ( 220, 222) to have an interference fit therebetween. 22. A cutting tool assembly as claimed in claim 21, wherein said interference fit is achieved by the tool shank being formed with a resilent slit (222). 23. A cutting tool assembly as claimed in claim 1, wherein the cutting head and the tool shank are formed with mating fixation members extending axially from the base surfaces thereof, and said fixation walls of the coupling portions are constituted by peripheral surfaces of said fixation members. 24. A cutting tool assembly as claimed in claim 1, wherein the raised base surface of each coupling portion of the tool shank and their associated fixation walls are equidistant from said longitudinal axis. 25. A cutting tool assembly as claimed in claim 5, wherein the torque transmission and fixation walls of each coupling portion are parts of a continuous step oriented transversely to said base surfaces and extending form one of said flutes to the peripheral surface of the coupling portion. This invention relates to a cutting tool assembly (1) comprising a cutting head (2,102) and a toot shank (4,104) having a longitudinal axis (6,106) and at least two chip flutes (8a,10a ,8b,10b) extending from the cutting head (2,102) to a rear of the tool shank (4,104). The cutting head (2,102) has a cutting portion (12,112) adjacent a leading end (13,113) and a cutting head mounting portion (14,114) adjacent a trailing end (15,115) thereof. The cutting head mounting portion (14,114) has a pair of diametrically oppositely disposed cutting head coupling portions (20,120). The tool shank (4,104) has a cutting head receiving portion (40,140) formed at a front face thereof and comprising a pair of diametrically oppositely disposed tool shank coupling portions (44,144) each extending between the two flutes (8b,10b) and having a stepped configuration. The tool shank (4,104) and cutting head coupling portions (20,120) each have a support surface (22,24,48,50) oriental substantially perpendicular to the longitudinal axis (6) and a torque transmission wall (26,52) oriented substantially transversely to the support surface and generally radially with respect to the longitudinal axis (6). The cutting head (2,102) is circumferentially co-extensive with the tool shank (4,104) and the cutting head coupling portions (20,120) mate in shape and dimensions the tool shank coupling portions (44, 144), each coupling portion having a lowered base surface (22,50) adjacent one of the flutes (8a, 10a), a raised base surface (24,48) adjacent the other flute and a side wall (26, 152) there between, at least one of the base surfaces constituting the support surface and the side wall constituting the torque transmission wall (26,152).

Full Text

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FIELD OF THE INVENTION
The present invention refers to a tool assembly comprising at least two members releasably coupled together in such a manner as to enable transfer of a rotary torque from one member to another. The invention particularly refers to a rotary cutting tool assembly for use in such operations as drilling, milling and the like.
BACKGROUND OF THE INVENTION
One example of a rotary cutting tool assembly having a coupling arrangement of the above-specified kind is disclosed in EP 0742065. The assembly comprises first and second assembly components having interfitting male and female coupling members formed at their interacting faces, the coupling members having radially directed arm portions for torque transmission, and a centering portion located therebetween. The coupling members are coaxially coupled together by a fastening screw.
The use of fastening screws in cutting tool assemblies of the above kind weakens the cutting tool and puts rather severe limitations on the miniaturization of the tool when rotary cutting tool assemblies of small diameters are concerned, since these tools have axially extending chip flutes, and, consequently, do not have a cross-sectional area sufficiently large and a tool body sufficiently strong to accommodate appropriate fastening screws.
EP 0118 806 discloses a drilling tool assembly comprising a cylindrical tool shank formed with two helical chip flutes extending generally along a longitudinal axis thereof and a drilling head removably mounted thereto in a self-holding manner not requiring a fastening screw.

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Thus, the drilling head comprises two diametrically oppositely disposed substantially planar cutting portions in the form of cutting plates and the tool shank has two diametrically oppositely disposed and radially oriented recesses formed at side surfaces of the chip flutes, the recesses mating with and being capable of receiving.the cutting plates of the drilling head. The cutting plates and the recesses have narrow base surfaces oriented substantially perpendicular to the longitudinal axis of the tool and wide side walls oriented transversely to the base surfaces and generally radially with respect to the longitudinal axis. The drilling tool assembly is further provided with fixation means in the form of a male fixation member axially protruding from the drilling head and capable of being received within a correspondingly shaped female fixation member formed in the tool holder. The fixation members are concentric with the longitudinal axis of the tool shank and have a radial extension substantially less than that of the cutting head and the tool shank. The fixation members widen in the direction away from the drilling head.
The drilling head is mounted in the tool shank by the insertion of the cutting plates in a position approximately in the middle of the flutes and rotating the drilling head in the direction counter to the drill rotation direction until the base surfaces of the cutting plates are fully supported by corresponding base surfaces of the recesses in the tool shank and the side walls of the cutting plates abut corresponding side walls of the recesses. During a cutting operation, the base surfaces of the drilling head and the recesses provide for the support of the drilling head against the cutting forces acting thereon, and their side walls function as torque transmission surfaces. The interaction of peripheral surfaces of the fixation members ensures the centering of the assembly and prevents the drilling head from being detached from or pulled out of the tool shank when the cutting tool is withdrawn from a workpiece being machined.
It should, however, be noted that the drilling head with a planar configuration as above is rather weak, especially when employed under torsion conditions. Furthermore, tools with cutting heads having a small

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thickness relative to the cross-sectional area of their tool shank are not sufficiently stable.
For the drilling head of the above planar design to be stronger and for the assembly with the above narrow support surfaces to be more stable, the side walls of the cutting plates and the tool shank recesses usually have an axial height substantially greater than the thickness of the drilling head body. This renders the tool assembly design described above hardly applicable to small and, particularly, to miniature cutting tools.
It is the object of the present invention to provide a new rotary cutting tool assembly which has advantages in the above respect.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a rotary cutting tool assembly comprising a cutting head and a tool shank having a longitudinal axis and at least two chip flutes extending from said cutting head to a rear of the tool shank;
said cutting head having a cutting portion adjacent a leading end and a cutting head mounting portion adjacent a trailing end thereof, said cutting head mounting portion having a pair of diametrically oppositely disposed cutting head coupling portions;
said tool shank having a cutting head receiving portion formed at a front face thereof and comprising a pair of diametrically oppositely disposed tool shank coupling portions each extending between said two flutes and having a stepped configuration, the tool shank coupling portions being adapted to receive said tool shank coupling portions;
said tool shank and cutting head coupling portions each having a support surface oriented substantially perpendicular to said longitudinal axis and a torque transmission wall oriented substantially transversely to said support surface and generally radially with respect to said longitudinal axis;
said cutting head and said tool shank having male and female fixation members which are concentric with the tool assembly;
characterised in that

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the cutting head is circumferentially co-extensive with the tool shank and the cutting head coupling portions mate in shape and dimensions the tool shank coupling portions, each coupling portion having a lowered base surface adjacent one of said flutes, a raised base surface adjacent the other flute and a side wall therebetween, at least one of the base surfaces constituting said support surface and said side wall constituting said torque transmission wall.
In accordance with another aspect of the present invention, there is provided a cutting head for use in a rotary cutting tool having a tool shank with a longitudinal axis and at least two chip flutes extending therealong, said cutting head being adapted for mounting at a front face of said tool shank coaxially therewith;
said cutting head having a cutting portion adjacent a leading end and a cutting head mounting portion adjacent a trailing end thereof, said cutting head mounting portion having a pair of diametrically oppositely disposed cutting head coupling portions;
said cutting Head coupling portions each having a support surface oriented substantially perpendicular to said longitudinal axis and a torque transmission wall oriented substantially transversely to said support surface and generally radially with respect to said longitudinal axis;
said cutting head having a fixation member which is concentric therewith;
characterised in that
the cutting head is circumferentially co-extensive with the tool shank and each cutting head coupling portion has a lowered base surface adjacent one of said flutes, a raised base surface adjacent the other flute and a side wall therebetween, at least one of the base surfaces constituting said support surface and said side wall constituting said torque transmission wall.
Preferably, the side walls of the cutting head and the tool shank coupling portions have an axial dimension which is substantially less than a distance between radially outermost points of said two chip flutes at said front face of the tool shank. Still more preferably, the axial dimension of

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said side walls of the cutting head and the tool shank coupling portions does not exceed, and even may be substantially less than half of, said distance between the radially outermost points of the two chip flutes. It is also preferable that the axial dimension of said side walls is less than a distance from the lowered base surfaces of the cutting head coupling portions to said leading end thereof.
Preferably, the cutting head is formed with chip flute sections which merge continuously with the chip flutes formed in the tool shank. Thereby, the entire assembly has a complete smooth design and the continuous chip flutes thereof enable very smooth chip evacuation.
Preferably, the lowered base surfaces of the cutting head coupling portions belong to recesses formed at the trailing end of the cutting head, and the raised base surfaces of the tool shank coupling portions belong to protrusions formed at the front face of the tool shank, the recesses and the protrusions being each bound, on their one side, by an adjacent flute, on their other side, by said side wall and, adjacent said longitudinal axis, by a central wall merging with said side wall. Preferably, the side and central walls merge with each other via a rounded corner.
In a first embodiment of the present invention, said central walls of the protrusions and'the recesses constitute peripheral walls of respectively said male and female fixation members, the peripheral walls of the coupling portions of each fixation member having a central base surface therebetween. In a second embodiment of the present invention, said male fixation member protrudes from the trailing end of the cutting head and said female fixation member is recessed with respect to the front face of the tool shank. The protruding and recessed fixation members each has peripheral walls and a central base surface therebetween.
In each of the above embodiments, it is preferable that said peripheral walls diverge in the direction away from the cutting head leading end. Preferably, these peripheral walls are in the form of conical arcs each having an axis which may or may not coincide with said longitudinal axis of the cutting tool assembly.

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The tool assembly may further be provided with locking means. Preferably, the locking means comprise two diametrically oppositely disposed flexible cylindrical locking pins projecting axially from the central base surface of the female fixation member and oriented substantially co-directionally with the peripheral walls of the male and female fixation members, and two locking receptacles in the form of arcuate depressions formed in the side surfaces of the male fixation member and adapted to receive therein said locking pins.
The tool assembly according to the present invention may further be provided with a device for assembling and dissembling thereof. The assembling device comprises an elongated cylindrical cavity of a diameter corresponding to the diameter of said cutting tool, at least said cavity being made of an elastic material, the cavity comprising a cutting head holding section and a tool shank receiving section, which sections are capable of resiliently encompassing the cutting head and the cutting head receiving portion of the tool shank, the cutting head holding section having the shape complementary to an outer configuration of the cutting head, whereby the rotation thereof relative to the said assembling device is avoided, and being provided with means preventing the cutting head from falling out of the cutting head holding section of the assembling device.
The coupling arrangement according to the present invention allows the cutting head to have a strong wide trailing end with a maximal available cross-sectional area and short side, torque transmission walls, whereby the stability of the cutting tool assembly is improved. This renders the coupling arrangement of the present invention particularly useful for miniature cutting tool assemblies.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
For a better understanding of the present invention and to show how the same may be carried out in practice, reference will now be made to the accompanying drawings, in which

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Fig. 1 is an isometric view of a cutting tool assembly, before its assembling, according to one embodiment of the present invention;
Fig. 2 is an isometric bottom view of a cutting head of the cutting tool assembly shown in Fig. 1;
Fig. 3 is a plan bottom view of the cutting head shown in Fig. 2;
Fig. 4 is an isometric partial view of a tool shank of the cutting tool assembly shown in Fig. 1;
Fig. 5 is a front view of the tool shank shown in Fig. 4;
Fig. 6 is an isometric view of the cutting tool assembly as shown in Fig. 1, at an initial stage of its assembling;
Fig. 7 is an isometric view of the cutting tool assembly as shown in Fig. 1, when assembled;
Fig. 8 is a cross-sectional view of the cutting tool assembly shown in Fig. 7;
Fig. 9 is an isometric view of a cutting tool assembly, before its assembling, according to another embodiment of the present invention;
Fig. 10 is an isometric bottom view of a cutting head of the cutting tool assembly shown in Fig. 9;
Fig. 11 is an partial isometric view of a tool shank of the cutting tool assembly shown in Fig. 9;
Fig. 12 is a cross-sectional view of the cutting tool assembly shown in Fig. 9, when assembled, taken across protrusions 156;
Fig. 13 is an isometric partially cross-sectional view of a cutting tool assembly shown in Fig. 9, at an initial stage of its assembling, taken across pins 220; and
Figs. 14 and 15 illustrate different embodiments of an assembling device for use with the cutting tool shown in Figs. 9 to 13.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A rotary cutting tool assembly 1 according to a first embodiment of the present invention is illustrated in Fig. 1. The cutting tool assembly

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1 comprises a cutting head 2 and a tool shank 4 having a longitudinal axis 6 and 180°-rotational symmetry with respect to the longitudinal axis 6. The cutting head 2 and the tool shank 4 have mating circumferential shapes and dimensions and are formed with respective chip flute sections 8a, 10a and 8b, 10b such that, when the cutting tool is assembled, the sections 8a and 8b and the sections 10a and 10b form continuous, preferably helical, flutes 8 and 10 which extend from the cutting head 2 to a rear of the tool shank 4.
As illustrated in Figs. 2 and 3, the cutting head 2 has a cutting portion 12 adjacent the cutting head leading end 13 and a cutting head mounting portion 14 adjacent the cutting head trailing end 15.
The cutting portion 12 of the cutting head will not be described herein since it does not constitute the subject matter of the present invention. However, it should be noted that the cutting portion 12 of the cutting head may have any appropriate design.
The cutting head mounting portion 14 comprises a pair of diametrically oppositely disposed cutting head coupling portions 20 each extending between the chip flute sections 8a and 10a and, as illustrated in Fig. 3, defined by a distance D between radially outermost points 21' and 21" thereof. As seen in Fig. 2, each cutting head coupling portion 20 has a stepped configuration with a lowered base surface 22 adjacent one chip flute section 8a, 10a, a raised base surface 24 adjacent the other chip flute ] section 10a, 8a, a side wall 26 therebetween and a central wall 28 merging with the side wall 26 via a rounded corner 27, the lowered base surface 22 and the side and central walls 26 and 28 defining therebetween a recess 29. The cutting head coupling portions 20 have a central base surface 30 therebetween.
As seen in Fig. 2, the lowered, raised and central base surfaces 22, 24 and 30 of the cutting head are substantially planar and are oriented generally perpendicular to the longitudinal axis 6, and the side wall 26 and the central wall 28 are co-directional with the longitudinal axis 6. As seen in Fig. 3, the side wall 26 extends generally radially and the central wall 28

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extends circumferentially with respect to the longitudinal axis 6. It should be understood that the side wall 26 does not necessarily need to be a planar surface but rather may be in the form of a curved plane, only a portion of which extends radially. Furthermore, the side wall 26 may not extend exactly in the radial direction but may rather be oriented at a relatively small angle thereto.
An axial dimension d (Fig. 2) of the side wall 26 of each cutting head coupling portion 20 is substantially less than the distance D (Fig. 3) between the radially outermost points 21' and 21" of the respective chip flutes sections 8a and 10a. The axial dimension d does not exceed and, preferably, is substantially less than half of the distance D and is less than a height H (Fig. 2) of the cutting head 2 measured between the leading end 13 and the lowered base surfaces 24 thereof.
As may be seen in Figs. 1, 2, 6 and 7 and best shown in Fig. 8, the central walls 28 are in the form of conical arcs diverging in the direction away from the cutting head leading end 13, the conical arcs having axes (not shown) which may or may not coincide with the longitudinal axis 6.
As shown in Figs. 4 and 5, the tool shank 4 has a front face 40 with a cutting head receiving portion 42 formed thereon. The cutting head receiving portion 42 has diametrically oppositely disposed tool shank coupling portions 44 mating in shape and dimensions with the cutting head coupling portions 20. Thus, each tool shank coupling portion 44 comprises a raised base surface 48, a lowered base surface 50, a side wall 52 therebetween and a central wall 54 merging with the side wall 52. The raised base surface 48 and the side and central walls 52 and 54 define between them protrusions 56 mating with and adapted to be received in the recesses 29 of the cutting head mounting portion 14. The tool shank coupling portions 44 have a central base surface 60 therebetween. The raised, lowered and central base surfaces 48, 50 and 60 and the side and central walls 52 and 54 of the tool shank coupling portions 44 correspond in orientation and dimensions to the respective lowered, raised and central

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base surfaces 22, 24 and 30 and side and central walls 26 and 28 of the cutting head coupling portions 20,(as shown in Fig 2).
As seen in Figs. 2, 3 and 4, the cutting head and the tool shank are further provided with respective male and female guiding members 64 (Fig. 2) and 66 (Fig. 4), which may also be arranged vice versa, for the simplification of mounting the cutting head 2 to the tool shank 4.
As illustrated in Fig. 6, the cutting head mounting portion 14 of the cutting head 2 is mounted to the cutting head receiving portion 42 of the tool shank 4 by the transverse insertion of the cutting head coupling portions 20 between the protrusions 56 of the tool shank coupling portions 44, and rotating the cutting head 2 in the direction A (counter the rotation direction of the cutting tool).until the side walls 26 of the cutting head coupling portions 20 abut the corresponding side walls 52 of the tool shank coupling portions 44 and the protrusions 56 of the latter coupling portions 44 are fully received in the recesses 29 of the former coupling portions 20.
The cutting tool 1 described above, as assembled, is illustrated in Figs. 7 and 8. During a cutting operation, the axial support of the cutting head 2 in the tool shank 4 is provided by the contact of the lowered and central base surfaces 22 and 30 of the cutting head 2 with the respective raised and central base surfaces 48 and 60 of the tool shank 4. The side walls 26 and 52 of, respectively, the cutting head 2 and the tool shank 4 function as torque transmission surfaces. The central walls 28 and 54 of, respectively, the cutting head 2 and the tool shank 4, which diverge in the direction away from the leading end 13 of the cutting head 2, interact in a dove-tail manner, whereby an accurate fixation and centering of the cutting head in the tool shank is provided. Such a fixation arrangement prevents the drilling head from being detached from or pulled out of the tool shank when the cutting tool is withdrawn from a workpiece being machined.
Figs. 9 to 14 illustrate a cutting tool assembly 101 according to a second embodiment of the present invention, in which a coupling arrangement is generally similar to that of the cutting tool assembly 1 illustrated in Figs. 1 to 8, and which differs therefrom mainly in the design of the fixation

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arrangement. Therefore, in the description of the cutting tool assembly 101 hereinbelow, only those parts thereof will be referred to, which are relevant to the description of the fixation arrangement.
As seen in Fig. 9, the cutting tool assembly 101 comprises a cutting head 102 and a tool shank 104 having a longitudinal axis 106 and two chip flutes (not designated).
The cutting head 102 shown separately in Fig. 10, has a cutting portion 112 adjacent the cutting head leading end 113 and a cutting head mounting portion 114 adjacent the cutting head trailing end 115. The cutting head mounting portion 114 comprises a pair of diametrically oppositely disposed cutting head coupling portions 120 each having a recess 129.
The tool shank 104 shown in Fig. 11 has a front face 140 with a cutting head receiving portion 142 formed thereon. The cutting head receiving portion 142 has tool shank coupling portions 144 with protrusions 156 mating in shape and dimensions with the recesses 129 of the cutting head coupling portions 120.
As seen in Figs. 9, 10 and 11, the cutting tool assembly 101 is provided with male and female fixation members 200 and 210 formed respectively in the cutting head 102 and the tool shank 104 concentrically therewith and having a radial dimension substantially less than a radial dimension of the cutting head and the tool shank. The male fixation member 200 of the cutting head 102 protrudes from the trailing end 115 thereof and the female fixation member 210 of the tool shank 104 is recessed with respect to the front face 140 thereof.
As shown in Figs. 10 and 11, the male and female fixation members 200 and 210 have respective peripheral walls 128 and 152 and central base surfaces 130 and 154 therebetween, which have the shape and interact in the fashion similar to that of the respective central walls 28 and 52 and central base surfaces 30 and 54 of the cutting head coupling members 20 and the tool shank coupling members 44 of the cutting tool assembly 1. Thus, as seen in Fig. 12, the peripheral walls 128 and 152 of

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the male and female fixation members 200 and 210 diverge away from the leading end 113 of the cutting head 102 and cooperate in a dove-tail manner.
The cutting tool assemblies 1 and 101 according to the present invention may be provided with locking means. One example of such locking means, as applied to the cutting tool assembly 101, will be described hereinbelow with reference to Figs. 10, 11 and 13.
The locking means comprise two cylindrical locking pins 220 (Figs. 11 and 13) projecting axially from the central base surface 154 of the female fixation member 200 of the tool shank 104 and disposed adjacent the peripheral walls 152 thereof and two corresponding cylindrical locking receptacles 222 (Figs. 10 and 13) formed in the peripheral walls 128 of the male fixation member 200 of the cutting head 102 and adapted to receive therein the locking pins 220. The locking pins 220 are inclined towards the longitudinal axis 106 such as to be generally co-directional with the diverging peripheral walls 128 and 152 of the respective male and female fixation members 200 and 210.
As seen in Fig. 13, the locking pins 220 are arranged in the tool shank 104 in a flexible manner which, in the described embodiment, is obtained by mounting each of the locking pins 220 in an elongated bore 230 formed in the tool shank 104 adjacent the peripheral walls 152 thereof and having two bore sections of different radial dimensions so that a lower portion 232 of the pin 220 fits snugly in a lower narrow section 236 of the bore 230, and an upper section 240 of the pin 220 is surrounded by an upper wide section 242 of the bore 230, being slightly radially bendable therein. The elongated bore 230 is disposed adjacent the peripheral walls 152 of the female fixation member 210 in such a manner that its upper wide portion 242 constitutes a partial continuation of a cylindrical depression 246 formed in the peripheral walls 152. The upper wide portion 242 of the bore 230 and the cylindrical depression 246 preferably have a radially elongated cross-sectional shape so as to enable required radial bending of the locking pins 220.

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Thus, when during assembling of the cutting tool 101, the-cutting head 102 is inserted in the cutting head receiving portion 142 of the tool shank 104 and rotated in the direction A, the peripheral walls 128 of the male fixation member 200 bias the pins 220 radially outwardly towards the peripheral walls 152 of the female fixation member 210.
Upon the abutment of the side walls 26 of the cutting head coupling portions 20 against the side walls 52 of the tool shank coupling portions 44, the rotation of the cutting head 102 is terminated and the locking pins 220 enter the locking receptacles 222. Preferably, the orientation of the locking pins 220 is such that they bias associated surfaces of the receptacles 222 and, consequently, the cutting head in the direction A. Thereby, reliable locking of the cutting head 102 in its mounting position is obtained.
The cutting tool assemblies described above may be further provided with an assembling device. Thus, Figs. 14 and 15 illustrate two examples of such a device for use with the cutting tool assembly 101. As seen, the assembling device 300 (Fig. 14) and 400 (Fig. 15) each have an elongated cylindrical cavity 310, 410 of a diameter corresponding to the diameter of the cutting tool 101. The assembling devices 300 and 400, or at least their cavities 310 and 410, are made of an elastic material and comprise a cutting head holding section 320, 420 and a tool shank receiving section 330, 430, which are capable of resiliently encompassing the cutting head 102 and the cutting head receiving portion 142 of the tool shank 104. The cutting head holding sections 320 and 420 of the cavities 310 and 410 have the shape complementary to an outer configuration of the cutting head 102 and, consequently, comprise convex portions 340 and 440 which are capable of entering the chip flute sections of the cutting head, whereby the rotation thereof relative to the assembling devices 300 and 400 is avoided. The assembling devices 300 and 400 may be further provided with means preventing the cutting head from falling out of the cutting head holding sections 320 and 420 of the devices. Thus, in the assembling device 300 shown in Fig. 14, these means are in the form of flexible elements 350 and,

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in the assembling device 400 shown in Fig. 15, these means are constituted by the convex elements 440 formed with an appropriate shape and dimensions. Alternatively, or in addition to the above elements 350 and 440, the cutting head holding sections 320 and 420 of the cylindrical cavities 310 and 410 may have a diameter which is slightly less than that of the cutting head 102 to enable the press-seating thereof in the corresponding cutting head holding section. When the cutting tool 101 is dissembled, the cutting head is released from the respective assembling device either by pushing it out of the device 300 at a rear end 360 thereof (Fig. 14), or by pulling it out of the device 400 at a front end 460 thereof.
The cutting tool assembly of the present invention and components thereof may have alternative designs comprising features different from those described above and shown in the drawings.

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LIST OF REFERENCE NUMERALS
1 cutting tool assembly in Figs. 1 to 8
2 cutting head
4 tool shank
6 longitudinal axis
8a, 10a chip flute sections of the cutting head
8b, 10b chip flute sections of the tool shank
12 cutting portion of the cutting head
13 leading end of the cutting head
14 cutting head mounting portion
15 trailing end of the cutting head
20 cutting head coupling portions
21', 21" radially outermost points of the chip flute sections 8a and 10a
22 lowered base surface of the cutting head coupling portion
24 raised base surface of the cutting head coupling portion
26 side wall of the cutting head coupling portion
27 rounded corner
28 central wall of the cutting head coupling portion
29 recess of the cutting head coupling portion
30 central base surface between the cutting head coupling portions
40 front face of the tool shank
42 cutting head receiving portion of the tool shank
44 tool shank coupling portions
48 raised base surface of the tool shank coupling portion
50 lowered base surface of the tool shank coupling portion
52 side wall of the tool shank coupling portion
54 central wall of the tool shank coupling portion
56 protrusion of the tool shank coupling portion
60 central base surface between the tool shank coupling portions
64, 66 male and female guiding members
101 cutting tool assembly in Figs. 9 to 13
102 cutting head
101
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104 tool shank
106 longitudinal axis 106
112 cutting portion of the cutting head
113 cutting head leading end
114 cutting head mounting portion
115 cutting head trailing end
120 cutting head coupling portion
128 peripheral walls of the male fixation member
129 recess of the cutting head coupling portion
130 central base surface of the male fixation member
140 front face of the tool shank
142 cutting head receiving portion of the tool shank
144 tool shank coupling portions
152 peripheral walls of the female fixation member
154 central base surface of the female fixation member
156 protrusions of the tool shank coupling portions
200 male fixation member of the cutting head
210 female fixation member of the tool shank
220 locking pins
222 locking receptacles
230 elongated bores
232 lower portion of the pin 220
236 lower, narrow section of the bore 230
240 upper section of the pin 220
242 upper wide section of the bore 230
246 cylindrical depression formed in the peripheral walls 152
300 assembling device shown in Fig. 14
310 cavity of the assembling device 300
320 cutting head holding section of the assembling device 300
330 tool shank receiving section of the assembling device 300
340 convex portions of the assembling device 300
350 flexible elements of the assembling device 300

- 17-
360 rear end of the assembling device 300
400 assembling device shown in Fig. 15
410 cavity of the assembling device 400
420 cutting head holding section of the assembling device 400
430 tool shank receiving section of the assembling device 400
440 convex portions of the assembling device 400
460 front end of the assembling device 400

WE CLAIM: 18.
1. A cutting tool assembly for rotary cutting operations comprising a dismantable cutting tool (1); and a device (300, 400) for assembly and disassembly of said cutting tool (1), the cutting tool constituting of a replaceable cutting head ( 2, 102) and a tool shank, (4, 104) having a common longitudinal axis ( 6, 106) and mating peripheral surfaces ( 26, 52, 28, 54, 128, 152),
said cutting head ( 2, 102) having a cutting portion ( 12, 112) adjacent a leading end ( 13, 113) and a cutting head mounting portion ( 14, 114) adjacent a trailing end (15, 115) thereof, and said tool shank ( 4, 104) having a cutting head receiving portion (42, 142) formed at a front face ( 40, 140) thereof, said cutting head mounting portion ( 14, 114) and the cutting head receiving portion (42, 142) of the tool shank ( 4, 104) each having two coupling portions, the cutting head couplings portions ( 20, 120) and the tool shank coupling portions (44, 144) being bound by* said peripheral surfaces ( 26, 52, 28, 54) and having stepped configurations mating in shape and dimensions;
each coupling portion ( 20, 44) having a pair of base surfaces ( 22, 24, 48, 50) of which one surface is raised ( 24, 48) and the other one is lowered ( 22, 50), the base surfaces extending transversely to said longitudinal axis (6) and the lowered surface (22) of each coupling portion (20)of the cutting head (2) and the raised surface (48) of each coupling portion (44) of the tool shank (4) being adapted for providing an axial support of the cutting head (2) in the tool shank (4), a torque transmission wall (26, 52) extending from a corresponding peripheral surface in a radial direction relative to said longitudinal axis (6) and separating and being oriented transversely to the raised (22) and lowered based surfaces (24), and a fixation wall (28, 54) disposed adjacent and extending transversely to the torque transmission wall (26,52) and circumferentially relative to said longitudinal axis (6), the fixation wall (28) of each cutting head coupling portion (20) sloping towards the longitudinal axis (6) in the direction of said leading end (13) of the cutting head (2) and having an angular extension (d) smaller than a corresponding angular distance (D) between adjacent extremities ( 21', 21") of the fixation walls of two different tool shank coupling portions (8a, 10a),
the cutting tool (1) being assembled by initially disposing the cutting head mounting portion ( 14) in such a manner relative to the cutting head receiving portion ( 42) as to insert the fixation walls ( 28) of the cutting head coupling portions ( 20) between the respective fixation walls ( 54) of the tool shank coupling portions (44), and subsequently rotating the cutting head (2) relative to the tool shank (4) until the cutting head coupling portions ( 20) fully overlie the corresponding tool shank coupling portions (44) with their base surfaces ( 22, 24, 48, 50) and torque transmitting walls ( 26, 52) abutting each other and their fixation walls ( 28, 54) co-axially interacting in an interlocking male-female fashion, providing thereby the self-clamping of the cutting head (2) on the tool shank (4).

19.
2. A cutting tool assembly as claimed in claim 1, wherein said lowered base surface
(22) of each coupling portion (20) of the cutting head (2) and said raised base
surface portion (48) of each coupling portion (44) of the tool shank (4) are
radially co-extensive with said torque transmission wall ( 26, 52).
3. A cutting tool assembly as claimed in claim 1, wherein the lowered base surfaces
(22) of the cutting head coupling portions (20) belong to recesses (29) formed at
the trailing end (15) of the cutting head (2), and the raised base surfaces (48) of
the tool shank coupling portions (44) belong to protrusions (56) formed at the
front face (40) of the tool shank (4), the depth (d) of the recesses (29) and the
height (H) of the protrusions (56) being defined by the axial extension of said
torque transmission wall ( 26, 52) which extension is less than the radial extension
(D) of the torque transmission wall (26,52).
4. A cutting tool assembly as claimed in claim 1, wherein said tool shank (4) is
formed with two chip flutes (8b, 10b).
5. A cutting tool assembly as claimed in claim 4, wherein said cutting head (2) is
formed with chip flute sections (8a, 10a) which emerge continuously with the
chip flutes ( 8b, 10b) formed in the tool shank (4).
6. A cutting tool assembly as claimed in claim 5, wherein said coupling portion
(20,44) of said cutting tool (1) extends between the two flutes so that its lowered
surface (22) is disposed adjacent one of the flutes (8a, 10a) and its raised surface
(24) is disposed adjacent the other flute (10a, 8a).
7. A cutting tool assembly as claimed in claim 3, wherein said tool shank (4) is
formed with chip flutes ( 8a, 10a, 8b, 10b) and said cutting head (2) is formed
with chip flute sections which merge continuously with the chip flutes (8b, 10b)
formed in the tool shank (2), the recesses (24) and the protrusions (56) of the
respective cutting head coupling portions (20 ) and tool shank coupling portions
(44) being each bound, on their one side, by an adjacent flute (8a,10a) on their
side, by said torque transmission wall (26, 52).
8. A cutting tool assembly as claimed in any one of claims 1 to 7, wherein said
cutting tool (1) is adapted for use in rotary operations.
9. A cutting tool assembly as claimed in claim 8, wherein said cutting tool (1) is
adapted for use in drilling operations.
2.
20.
10. A cutting tool assembly as claimed in claim 1, wherein said replaceable cutting
head mounts on said tool shank along a longitudinal axis thereof.
11. A cutting tool assembly as claimed in claim 10, wherein said tool shank having a
front cutting head receiving portion formed with at least two coupling portions
each bound by a tool shank peripheral surface and formed with a base surface and
formed with a base surface, a torque transmission wall and a fixation wall;
12. A cutting tool assembly as claimed in claim 11, wherein said cutting head having
a peripheral surface mating with said tool shank peripheral surface, a cutting
portion adjacent a leading end and a cutting head mounting portion adjacent a
trailing end thereof, the cutting head mounting portion being formed with at least
two coupling portions bound by said peripheral surface of the cutting head;
13. A cutting tool assembly as claimed in claim 12, wherein each coupling portion of
the cutting head having a base surface extending transversely to said longitudinal
axis and adapted for participating in an axial support of the cutting head in the
tool shank, a torque transmission wall extending in a generally radial direction
relative to said longitudinal axis and oriented transversely to said base surface,
and a fixation wall disposed adjacent and extending transversely to the torque
transmission wall and circumferentially relative to said longitudinal axis, the
fixation wall of each cutting head coupling portion having an angular extension
smaller than a corresponding angular extension smaller than a corresponding
angular distance between adjacent extremities of the fixation walls of two
different tool shank coupling portions.
14. A cutting tool assembly as claimed in claim 12, wherein said lowered base surface
of each coupling portion of the cutting head are radially co-extensive with said
torque transmission wall.
15. A cutting tool assembly as claimed in claim 12, wherein a body of said cutting
head is solid.
16. A cutting tool assembly as claimed in claim 13, wherein said lowered base surface
and said fixation wall of each coupling portion of the cutting head are equidistant
from said longitudinal axis.
17. A cutting tool assembly as claimed in claim 12, wherein said cutting head is
formed with a fixation member extending axially from the base surfaces thereof,
and said fixation walls of the coupling portions of the cutting head are constituted
by peripheral surfaces of said fixation member.
18. A cutting tool assembly as claimed in claim 12, wherein the torque transmission
and fixation walls of each coupling portion are parts of a continuous step oriented
18.
21.
transversly to said base surfaces and extending from one of said flutes to the peripheral surface of the coupling portion.
19. A cutting tool assembly as claimed in claims 12 and 13, wherein said torque
transmission wall is obliquely inclined to said base surfaces.
20. A cutting tool assembly as claimed in claim 1, wherein said device (300, 400) for
assembly and disassembly of said cutting tool (1) comprises an elongated
cylindrical cavity (310, 410) of a diameter corresponding to the diameter of said
cutting tool (2, 102, 4, 104) at least said cavity (310) being made of an elastic
material, the cavity (310) comprising a cutting head holding section (320, 420),
and a tool shank receiving section (330, 430), which sections are capable of
resiliently encompassing the cutting head (2) and the cutting head receiving
portion ( 42, 142) of the tool shank ( 4, 104), the cutting head holding section
having the shape complementary to an outer configuration of the cutting head (2,
102), whereby the rotation thereof relative to the assembling device (300, 400) is
avoided, and being provided with means (350, 440) preventing the cutting head
(2, 102) from falling out of the cutting head holding section (320) of the device
(300,400)
21. A cutting tool assembly as claimed in claim 1, wherein the fixation walls of the
coupling portions of said tool shank and said cutting head are provided with
locking means ( 220, 222) to have an interference fit therebetween.
22. A cutting tool assembly as claimed in claim 21, wherein said interference fit is
achieved by the tool shank being formed with a resilent slit (222).
23. A cutting tool assembly as claimed in claim 1, wherein the cutting head and the
tool shank are formed with mating fixation members extending axially from the
base surfaces thereof, and said fixation walls of the coupling portions are
constituted by peripheral surfaces of said fixation members.
24. A cutting tool assembly as claimed in claim 1, wherein the raised base surface of
each coupling portion of the tool shank and their associated fixation walls are
equidistant from said longitudinal axis.
25. A cutting tool assembly as claimed in claim 5, wherein the torque transmission
and fixation walls of each coupling portion are parts of a continuous step oriented
transversely to said base surfaces and extending form one of said flutes to the
peripheral surface of the coupling portion.

This invention relates to a cutting tool assembly (1) comprising a cutting head (2,102) and a toot shank (4,104) having a longitudinal axis (6,106) and at least two chip flutes (8a,10a ,8b,10b) extending from the cutting head (2,102) to a rear of the tool shank (4,104). The cutting head (2,102) has a cutting portion (12,112) adjacent a leading end (13,113) and a cutting head mounting portion (14,114) adjacent a trailing end (15,115) thereof. The cutting head mounting portion (14,114) has a pair of diametrically oppositely disposed cutting head coupling portions (20,120). The tool shank (4,104) has a cutting head receiving portion (40,140) formed at a front face thereof and comprising a pair of diametrically oppositely disposed tool shank coupling portions (44,144) each extending between the two flutes (8b,10b) and having a stepped configuration. The tool shank (4,104) and cutting head coupling portions (20,120) each have a support surface (22,24,48,50) oriental substantially perpendicular to the longitudinal axis (6) and a torque transmission wall (26,52) oriented substantially transversely to the support surface and generally radially with respect to the longitudinal axis (6). The cutting head (2,102) is circumferentially co-extensive with the tool shank (4,104) and the cutting head coupling portions (20,120) mate in shape and dimensions the tool shank coupling portions (44, 144), each coupling portion having a lowered base surface (22,50) adjacent one of the flutes (8a, 10a), a raised base surface (24,48) adjacent the other flute and a side wall (26, 152) there between, at least one of the base surfaces constituting the support surface and the side wall constituting the torque transmission wall (26,152).

Documents:

01569-cal-1997-abstract.pdf

01569-cal-1997-claims.pdf

01569-cal-1997-correspondence.pdf

01569-cal-1997-description (complete).pdf

01569-cal-1997-drawings.pdf

01569-cal-1997-form-1.pdf

01569-cal-1997-form-13.pdf

01569-cal-1997-form-2.pdf

01569-cal-1997-form-3.pdf

01569-cal-1997-gpa.pdf

1569-CAL-1997-FORM-27-1.pdf

1569-CAL-1997-FORM-27.pdf

1569-CAL-1997-OTHERS.pdf

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Patent Number

193823

Indian Patent Application Number

1569/CAL/1997

PG Journal Number

30/2009

Publication Date

24-Jul-2009

Grant Date

01-Apr-2005

Date of Filing

26-Aug-1997

Name of Patentee

ISCAR LTD.

Applicant Address

P.O. BOX 11, MIGDAL, TEFEN

Inventors:

#	Inventor's Name	Inventor's Address
1	GIL HECHT	6 DEGANIA ST. HADERA 38260

PCT International Classification Number

B23B 51/02

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	120948	1997-05-29	Israel