Title of Invention	CONNECTING DEVICE FOR THE CONNECTION OF A HOSE TO FLUID TRANSPORTING LINE
Abstract	The invention relates to a connecting device (1) which consists of a connecting nipple (5) having an annular ring (7) and a compression sleeve (15). The aim of the invention is to provide a particularly compact connecting device. For this purpose, the compression sleeve (15) has a connecting area (16) with a substantially square cross-section which is forced onto the annular ring (7) by pressure. The securing area (16) axially fastens the compression sleeve to the connecting nipple (5), however, without engaging behind it, i.e. it is provided with a section that extends beyond the annular ring (7). The connecting device (1) is therefore especially compact in the axial direction and allows for a bigger sealing length. The overall length of the connecting device (1) is exclusively determined by the length of the peripheral surface (6) serving for sealing in relation to the axial length of the annular ring (7). The connecting device does not require any additional sections engaging behind the annular ring (7).

Title of Invention

CONNECTING DEVICE FOR THE CONNECTION OF A HOSE TO FLUID TRANSPORTING LINE

Abstract

The invention relates to a connecting device (1) which consists of a connecting nipple (5) having an annular ring (7) and a compression sleeve (15). The aim of the invention is to provide a particularly compact connecting device. For this purpose, the compression sleeve (15) has a connecting area (16) with a substantially square cross-section which is forced onto the annular ring (7) by pressure. The securing area (16) axially fastens the compression sleeve to the connecting nipple (5), however, without engaging behind it, i.e. it is provided with a section that extends beyond the annular ring (7). The connecting device (1) is therefore especially compact in the axial direction and allows for a bigger sealing length. The overall length of the connecting device (1) is exclusively determined by the length of the peripheral surface (6) serving for sealing in relation to the axial length of the annular ring (7). The connecting device does not require any additional sections engaging behind the annular ring (7).

Full Text	FIELD OF INVENTION The invention relates to a connecting device for the connection of a hose to a fluid-transporting line. BACKGROUND OF THE INVENTION Referring to automotive engineering, but also referring to other applications, it is important again and again that hoses be connected to lines and connecting nipples of other units, such as, for example, pumps, cooling devices, etc. This is difficult, at least in those cases in which only extremely minimal design space is available for establishing the connection or for the connection itself, in particular, in view of minimal space available in longitudinal direction of the hose that is to be connected. On the other hand, it is actually expected, in automotive engineering, that hose connections be tight and be made to last for a long time even under adverse conditions, such as corrosive attack, temperature changes and mechanical stress, such as vibrations and the like. Such connections are, in particular, nipple-to-hose connections that are used to attach connecting nipples to hoses. Such nipple connections must not be too long in axial direction. OBJECTS OF THE INVENTION In view of this, it is the object of the invention to provide a nipple-to-hose connection that can be established by a reliable process, is tight, is made to last for a long time, and is short. This object is achieved with the connecting device is accordance with Claim 1: SUMMARY OF THE INVENTION The inventive connecting device comprises a connecting nipple and a compression sleeve which is used to hold the hose to be connected on the nipple. The connecting nipple is provided with an annular ring which is encompassed by a plastically deformed connecting area of the compression sleeve. The connecting area secures the compression sleeve on the connecting nipple in a form-closed manner. As opposed to this, the hose fitting section of the compression sleeve presses the hose against the peripheral surface of the connecting nipple, thus securing said connecting nipple in a sealed manner. As a result of the radially inward direction of compression of the connecting area in direct radial alignment relative to the annular ring, the space required for securing the compression sleeve on the connecting nipple becomes very small. Directly adjoining the annular ring, the nipple is free toward the outside. For example, the nipple may be provided with an external thread and screwed into tapped bores. Inasmuch as only the area of the bead is used to fix the compression sleeve in position, the entire remaining length of the connecting means can be used to fit the hose and to secure said hose on the connecting nipple. In so doing, even very short connecting nipples can be used to implement seal lengths of more than 20 mm. Furthermore, the compression of the connecting area with the annular ring effects not only the axial securing of the compression sleeve on the connecting nipple by a reliable process and in a long-lasting manner, but this compression also contributes to the seal created at the hose on the nipple. It is considered advantageous when the connecting area has a wall thickness that is greater than the wall thickness of the hose fitting section. In so doing, the connecting area forms a highly compact annular component that extends in a tubular manner away from the hose fitting section. Preferably, the connecting area, when it has not been deformed yet, has an internal annular shoulder that accommodates the annular ring of the nipple. In so doing, a connecting area configured as an abutment acts, on the one hand, as the support of the connecting area an the peripheral surface of the nipple, and acts, on the other hand, as an axial stop, and thus as a positioning aid before and during the subsequent compressing of the connecting area. During the compression, the support of the support section on the nipple has the effect that the inward-directed forces deform the connecting area in such a manner that the material of the connecting area flows around the bead without flattening it. This is of particular advantage in the case of thin-walled connecting nipples, as are usually used in the interest of savings with respect to material and weight, as well as in the interest of the largest possible dimensions of the end-to-end fluid channel. A nipple is considered thin-walled, when the annular ring used for mounting is configured as a pipe on the outside of the nipple, as well as a groove on the inside of said nipple. In most cases, this is true when the radial wall thickness of the nipple is smaller than the axial length of the annular ring. In a preferred embodiment, the connecting area and the annular bead are matched in such a manner that the plastically deformed area of the connecting area is flush with the bead. With the use of this measure, an optimal axial attachment to the compression sleeve on the connecting nipple is achieved without requiring installation space on the free connecting side of the nipple, i.e., on the side facing away from the hose. In addition, the compression can thus be achieved with minimal deformation forces and by reliable process. In so doing, the connection between the compression sleeve and the connecting nipple can be achieved in a very simple and, at the same time, cost-effective manner and by means of a reliable process. For example, the nipple may receive its desired external profile by means of a rolling process. A cost-effective manufacture is possible. For example, the compression sleeve may also be manufactured by means of a rolling process. It may have an internal profile that has already been largely adapted to the annular ring of the nipple. At any rate, considering these embodiments, the compression sleeve is so short that its end away from the connected hose does not, or at least does not substantially, project beyond the annular ring. In compressed state, the compression sleeve preferably is flush on its face in a plane which also marks the beginning of the annular ring. Additional detains of advantageous embodiments of the invention are obvious from the drawings, the description and/or the subclaims. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING The drawings show exemplary embodiments of the invention. They show in Figure 1 a longitudinal section of a schematic representation of a connecting device with a connecting nipple and a compression sleeve for the connection of a hose to a fluid channel of an assembly; Figure 2 an exploded view of the connecting device in accordance with Figure 1, before the hose is mounted to the nipple; Figure 3 a schematic longitudinal section of the assembled, however, not yet compressed, connecting device in accordance with Figure 2; Figure 4 a modified embodiment of the connecting device with a hose connected to a pipe; Figure 5 a detail of a schematic representation of the connecting nipple associated with the connecting device. Figure 6 a detail of a representation, partially in longitudinal section, of the compression sleeve associated with the connecting device, including a few measurements; and, Figure 7 a detail of a representation, enlarged and in longitudinal section, of the connecting device with a compression sleeve pressed onto the connecting nipple. DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION Figure 1 shows a connecting device 1 by means of which a hose 2, in particular, a fluid-transporting hose 2, is connected to an assembly 3, for example, configured as a coolant compressor, an oil-transporting assembly, such as, for example a hydraulic device or the like. The hose 2 and the assembly 3 enclose a fluid-transporting channel 4. This channel extends through a connecting nipple 5 shown in Figure 2 by itself. The connecting nipple is designed in a substantially tubular manner and encloses a fluid channel, which extends from the face to its other face and is not illustrated in detail. On its outside, said connecting nipple has a cylindrical peripheral surface 5 which may also have the form of a truncated cone. In such cases, the angle of taper, however, is rather minimal. On one end of the cylindrical peripheral surface 6, i.e., the end facing away from the hose, the connecting nipple 5 has an annular ring 7, details of which are obvious from Figure 5. Said annular ring has an essentially arcuate cross-section and a height H over the peripheral surface 6, which corresponds approximately to the wall thickness D of the connecting nipple 5. Its length L, measured in longitudinal direction, corresponds preferably to two to three times the wall thickness. Both flanks of the annular ring 7, together with the peripheral surface 6, subtend an angle of 30° to 50°, preferably 40°. The annular ring 7 is rounded. Its connection to the cylindrical peripheral surface 6 is formed by the edges 8, 9 having a radius of curvature R of, for example, 1 mm. The total length of the connecting area is 25 mm, for example, whereby more than 20 mm are taken up by the section of the peripheral surface 6 located between the annular ring 7 and the free end 11. On the other side of the annular ring 7, the connecting nipple 5 may continue as a straight pipe, as is shown by figure 4, for example, or said connecting nipple may be provided with an external thread 12, for example, in order to be screwed into a tapped bore. The thread 12 may extend up to the annular ring 7. It is also possible to provide an annular shoulder 14, as is indicated in Figure 2. A compression sleeve 15 that holds the hose 2 tightly on the connecting nipple 5 is used to mount the hose 2 to the connecting nipple 5. To do so, the compression sleeve 15 is appropriately deformed, as will be explained later in detail. The not deformed compression sleeve is shown in Figures 2, 3 and 6 (in detail). As is particularly obvious from Figure 2, the compression sleeve 15 has an annular connecting area 16, from which extends a pipe-shaped hose fitting section 17. The hose fitting section 17 is designed as a hollow cylinder and has an inside diameter which substantially matches the outside diameter of the hose 2. The wall thickness of the hose fitting section 17 is distinctly smaller than the connecting area 16. On the outside, the not deformed compression sleeve 15 is designed in a cylindrical manner, i.e., the connecting area 16 and the hose fitting section 17 have the same outside diameter. At the transition between the connecting area 16 and the hose fitting section 17, a support section 18 is provided, said support section, together with the hose fitting section, defining an annular shoulder 19. This annular shoulder is used for the end-face abutment of the hose 2. The support section 18 extends as a radially inward-directed annular rib up to a narrow cylindrical annular surface 21 having a diameter which substantially matches the diameter of the peripheral surface 6. The annular surface 21 is one dimension of play greater than the peripheral surface 6, so that the compression sleeve 15 can be easily slipped onto the connecting nipple 5. As is obvious, in particular, from Figure 6, adjoining the annular surface 21 is a slanted face 22 forming a chamfer. Consequently, this chamfer forms a chamfered shoulder toward the cylindrical internal face 23 of the connecting area 16. The internal face 23 has a chamfer 24 adjoining the axial end face of the connecting area 16. The length of the internal face 23 in axial direction corresponds approximately to the length L of the annular ring 7. The inside diameter 23 matches the largest outside diameter of the annular ring 7. The hose connection is established with the connecting nipple 5 and the compression sleeve 15 as follows: In order to establish the connection, the hose 2, the compression sleeve 15 and the connecting nipple 5, as shown by Figure 2, are first slid together, as is obvious from Figure 3. In so doing, the hose 2 is already seated somewhat tightly on the peripheral surface 6 of the connecting nipple 5. Its face abuts against the annular shoulder 19. The support section 18 abuts against the annular ring 7. The inside face of the hose fitting section 17 abuts against the outside of the hose 2 or displays minimal play with respect thereto. The internal face 23 abuts with minimal play against the annular ring 7 and extends beyond said annular ring. Now, a compression tool, such as, for example a jointing clamp, or a revolving compression tool moving rollers on an orbital path about the compression sleeve 15 and, in so doing, exerting inward pressure, is used to cause a radial deformation of the compression sleeve 15. In so doing, the hose fitting section 17, as well as the connecting area 16, is plastically deformed in radially inward direction. In so doing, the hose fitting section 17 is pressed inward, specifically in at least one and preferably more, annular zones 26, 27. As a result of this, the hose fitting section 17 is imparted with a wavy shape in longitudinal section. Consequently, as is obvious from Figure 7, in particular, the hose 2 is pressed tightly against the peripheral surface 6 of the connecting nipple 5, thereby achieving fluid-tightness. During the deformation of the connecting area 16, in particular, the section being in radial alignment with the annular ring 7 is pressed radially inward, in which case the external circumference of the connecting area 16 remains substantially cylindrical. The support section 18 is not deformed radially inward. In so doing, the annular face 21, however, is still pressed slightly inward and thus comes into tight contact with the peripheral surface 6 of the connecting nipple 5. The remaining material of the connecting area 16 flows around the annular ring 7, enclosing it in a form-closed manner. In so doing, the plastic deformation of the connecting area 16 is relatively minimal. During the deformation, the face 25 is - and remains - at one height with the edge 8 and thus is flush with the annular ring 7. In so doing, after the completed deformation, the connecting area 16 forms an edge 28, on which the area of the face 25 in abutment with the annular ring 7 subtends an acute angle of 50°, for example. Due to the support of the connecting area over the support section 18 on the connecting nipple 5, a flattening of the annular ring 7 is avoided during the plastic deformation of the connecting area 18. Rather, the material of the connecting area 16 abuts in a flat manner against the annular ring 7 and flows around annular ring. Thus, a tight seal and an axially form-closed securing of the compression sleeve 15 and the hose 2 on or at the connecting nipple 5 is achieved. Above, the inventive connecting device 1 has been described with respect to a screw nipple. However, as already mentioned, the compression sleeve 15 can also be used for affixing the hose 2 to a pipe provided with an annular ring 7, as is obvious from Figure 4. Referring to the embodiment shown in Figure 4, the above descriptions use the same reference numbers and are applicable accordingly. A connecting device 1, consisting of a connecting nipple 5 with an annular ring 7 and a compression sleeve 15, has a particularly short design, in that the compression sleeve 15 has a connecting area 16 having a substantially square cross-section, whereby said connecting area 16 is pressed onto the annular ring 7. In so doing, the connecting area 16 ensures the axial attachment of the compression sleeve to the connecting nipple 5. The latter encloses and extends beyond the annular ring 7. However, it does not engage behind it, i.e., it does not have a section extending beyond the annular ring 7. As a result of this, the connecting device 1 is particular short in axial direction and makes a long sealing length possible. The total length of the connecting device 1 is exclusively defined by the length of the peripheral surface 6 that is used to provide the seal with respect to the axial length of the annular ring 7. No additional space for sections extending potentially behind the annular ring 7 is required. WE CLAIM 1. Connecting device (1) for the connection of a hose (2) to fluid-transporting lines or assemblies (3), comprising a connecting nipple (5) comprising a fluid channel and a jacket surface (6) having the form of a cylinder or a truncated cone, said barrel surface being provided with a peripheral rounded annular bead (7), a compression sleeve (15) having a hose fitting section (17) and a securing section (16) that is plastically deformable and associated with the annular bead (7), said securing section extending over the annular bead (7) in order to secure the compression sleeve (15) in axial direction on the connecting nipple (5), characterized in that an axial end face (25) of the securing section (16) is located on the same level as the edge (8) forming the connection of the annular bead (7) with the jacket surface (6), and that the end face (25) is thus flush with the annular bead (7). 2. Connecting device as claimed in Claim 1, wherein the securing section (16) has a wall thickness that is greater than a wall thickness of the hose fitting section (17). 3. Connecting device as claimed in Claim 1, wherein the hose fitting section (17) has the basic shape of a hollow cylinder and is deformed radially inward by plastic deformation on a least one point (26, 27). 4. Connecting device as claimed in Claim 3, wherein the hose fitting section (17) has an inside diameter that substantially corresponds to the outside diameter of the hose (2) that is to be connected. 5. Connecting device as claimed in Claim 1, wherein the compression sleeve (15) comprises an annular shoulder (21) between the hose fitting section (17) and the securing section (16), said annular shoulder being directed radially inward for the end-face abutment of the hose (2). 6. Connecting device as claimed in Claim 1, wherein the securing section (17) has a supporting section (18) arranged between the hose (2) and the annular bead (7), said annular bead being formed by an annular projection that is directed radially inward. 7. Connecting device as claimed in Claim 6, wherein the projection has a narrow cylindrical radially inward facing annular surface (21), the diameter of said annular surface being smaller than the outside diameter of the annular bead (7). 8. Connecting device as claimed in Claim 7, wherein the diameter of the annular surface (21) corresponds to the diameter of the jacket surface (6), with the exception of minimal play, directly adjoining the annular bead (7). 9. Connecting device as claimed in Claim 6, wherein the annular bead (7) is held in an axially stable and tolerance-free manner between the support section (18) and the plastically deformed region (16) of the securing section (17). 10. Connecting device as claimed in Claim 1, wherein the plastically deformed region of the securing section (16) ends at an acute-angle edge (28), said edge abutting against one end of the annular bead (7). ABSTRACT CONNECTING DEVICE FOR THE CONNECTION OF A HOSE TO FLUID TRANSPORTING LINE The invention relates to a connecting device (1) which consists of a connecting nipple (5) having an annular ring (7) and a compression sleeve (15). The aim of the invention is to provide a particularly compact connecting device. For this purpose, the compression sleeve (15) has a connecting area (16) with a substantially square cross-section which is forced onto the annular ring (7) by pressure. The securing area (16) axially fastens the compression sleeve to the connecting nipple (5), however, without engaging behind it, i.e. it is provided with a section that extends beyond the annular ring (7). The connecting device (1) is therefore especially compact in the axial direction and allows for a bigger sealing length. The overall length of the connecting device (1) is exclusively determined by the length of the peripheral surface (6) serving for sealing in relation to the axial length of the annular ring (7). The connecting device does not require any additional sections engaging behind the annular ring (7).

Full Text

FIELD OF INVENTION
The invention relates to a connecting device for the connection of a hose to a fluid-transporting line.
BACKGROUND OF THE INVENTION
Referring to automotive engineering, but also referring to other applications, it is important again and again that hoses be
connected to lines and connecting nipples of other units, such as, for example, pumps, cooling devices, etc. This is difficult, at
least in those cases in which only extremely minimal design space is available for establishing the connection or for the
connection itself, in particular, in view of minimal space available in longitudinal direction of the hose that is to be connected. On
the other hand, it is actually expected, in automotive engineering, that hose connections be tight and be made to last for a long
time even under adverse conditions, such as corrosive attack, temperature changes and mechanical stress, such as vibrations
and the like. Such connections are, in particular, nipple-to-hose connections that are used to attach connecting nipples to hoses.
Such nipple connections must not be too long in axial direction.
OBJECTS OF THE INVENTION
In view of this, it is the object of the invention to provide a nipple-to-hose connection that can be established by a reliable
process, is tight, is made to last for a long time, and is short.
This object is achieved with the connecting device is accordance with Claim 1:
SUMMARY OF THE INVENTION
The inventive connecting device comprises a connecting nipple and a compression sleeve which is used to hold the hose to be
connected on the nipple. The connecting nipple is provided with an annular ring which is encompassed by a plastically deformed
connecting area of the compression sleeve. The connecting area secures the compression sleeve on the connecting nipple in a
form-closed manner. As opposed to this, the hose fitting section of the compression sleeve presses the hose against the
peripheral surface of the connecting nipple, thus securing said connecting nipple in a sealed manner.
As a result of the radially inward direction of compression of the connecting area in direct radial alignment relative to the annular
ring, the space required for securing the compression sleeve on the connecting nipple becomes very small. Directly adjoining the
annular ring, the nipple is free toward the outside. For example, the nipple may be provided with an external thread and
screwed into tapped bores. Inasmuch as only the area of the bead is used to fix the compression sleeve in position, the entire
remaining length of the connecting means can be used to fit the hose and to secure said hose on the connecting nipple. In so
doing, even very short connecting nipples can be used to implement seal lengths of more than 20 mm. Furthermore, the
compression of the connecting area with the annular ring effects not only the axial securing of the compression sleeve on the
connecting nipple by a reliable process and in a long-lasting manner, but this compression also contributes to the seal created at
the hose on the nipple.
It is considered advantageous when the connecting area has a wall thickness that is greater than the wall thickness of the hose
fitting section. In so doing, the connecting area forms a highly compact annular component that extends in a tubular manner
away from the hose fitting section. Preferably, the connecting area, when it has not been deformed yet, has an internal annular
shoulder that accommodates the annular ring of the nipple. In so doing, a connecting area configured as an abutment acts, on
the one hand, as the support of the connecting area

an the peripheral surface of the nipple, and acts, on the other hand, as an axial stop, and thus as a positioning aid before and
during the subsequent compressing of the connecting area. During the compression, the support of the support section on the
nipple has the effect that the inward-directed forces deform the connecting area in such a manner that the material of the
connecting area flows around the bead without flattening it. This is of particular advantage in the case of thin-walled connecting
nipples, as are usually used in the interest of savings with respect to material and weight, as well as in the interest of the largest
possible dimensions of the end-to-end fluid channel. A nipple is considered thin-walled, when the annular ring used for mounting
is configured as a pipe on the outside of the nipple, as well as a groove on the inside of said nipple. In most cases, this is true
when the radial wall thickness of the nipple is smaller than the axial length of the annular ring.
In a preferred embodiment, the connecting area and the annular bead are matched in such a manner that the plastically
deformed area of the connecting area is flush with the bead. With the use of this measure, an optimal axial attachment to the
compression sleeve on the connecting nipple is achieved without requiring installation space on the free connecting side of the
nipple, i.e., on the side facing away from the hose. In addition, the compression can thus be achieved with minimal deformation
forces and by reliable process.
In so doing, the connection between the compression sleeve and the connecting nipple can be achieved in a very simple and, at
the same time, cost-effective manner and by means of a reliable process. For example, the nipple may receive its desired
external profile by means of a rolling process. A cost-effective manufacture is possible. For example, the compression sleeve
may also be manufactured by means of a rolling process. It may have an internal profile that has already been largely adapted
to the annular ring of the nipple. At any rate, considering these embodiments, the compression sleeve is so short that its end
away from the connected hose does not, or at least does not substantially, project beyond the annular ring. In compressed
state, the compression sleeve preferably is flush on its face in a plane which also marks the beginning of the annular ring.
Additional detains of advantageous embodiments of the invention are obvious from the drawings, the description and/or the
subclaims.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
The drawings show exemplary embodiments of the invention. They show in
Figure 1 a longitudinal section of a schematic representation of a connecting device with a connecting nipple and a
compression sleeve for the connection of a hose to a fluid channel of an assembly;
Figure 2 an exploded view of the connecting device in accordance with Figure 1, before the hose is mounted to the
nipple;
Figure 3 a schematic longitudinal section of the assembled, however, not yet compressed, connecting device in
accordance with Figure 2;
Figure 4 a modified embodiment of the connecting device with a hose connected to a pipe;
Figure 5 a detail of a schematic representation of the connecting nipple associated with the connecting device.

Figure 6 a detail of a representation, partially in longitudinal section, of the compression sleeve associated with the
connecting device, including a few measurements; and,
Figure 7 a detail of a representation, enlarged and in longitudinal section, of the connecting device with a compression
sleeve pressed onto the connecting nipple.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
Figure 1 shows a connecting device 1 by means of which a hose 2, in particular, a fluid-transporting hose 2, is
connected to an assembly 3, for example, configured as a coolant compressor, an oil-transporting assembly, such
as, for example a hydraulic device or the like. The hose 2 and the assembly 3 enclose a fluid-transporting channel
4. This channel extends through a connecting nipple 5 shown in Figure 2 by itself. The connecting nipple is
designed in a substantially tubular manner and encloses a fluid channel, which extends from the face to its other
face and is not illustrated in detail. On its outside, said connecting nipple has a cylindrical peripheral surface 5
which may also have the form of a truncated cone. In such cases, the angle of taper, however, is rather minimal.
On one end of the cylindrical peripheral surface 6, i.e., the end facing away from the hose, the connecting nipple 5
has an annular ring 7, details of which are obvious from Figure 5. Said annular ring has an essentially arcuate
cross-section and a height H over the peripheral surface 6, which corresponds approximately to the wall thickness D
of the connecting nipple 5. Its length L, measured in longitudinal direction, corresponds preferably to two to three
times the wall thickness. Both flanks of the annular ring 7, together with the peripheral surface 6, subtend an angle
of 30° to 50°, preferably 40°. The annular ring 7 is rounded. Its connection to the cylindrical peripheral surface 6 is
formed by the edges 8, 9 having a radius of curvature R of, for example, 1 mm. The total length of the connecting
area is 25 mm, for example, whereby more than 20 mm are taken up by the section of the peripheral surface 6
located between the annular ring 7 and the free end 11. On the other side of the annular ring 7, the connecting
nipple 5 may continue as a straight pipe, as is shown by figure 4, for example, or said connecting nipple may be
provided with an external thread 12, for example, in order to be screwed into a tapped bore. The thread 12 may
extend up to the annular ring 7. It is also possible to provide an annular shoulder 14, as is indicated in Figure 2.
A compression sleeve 15 that holds the hose 2 tightly on the connecting nipple 5 is used to mount the hose 2 to the
connecting nipple 5. To do so, the compression sleeve 15 is appropriately deformed, as will be explained later in
detail. The not deformed compression sleeve is shown in Figures 2, 3 and 6 (in detail). As is particularly obvious
from Figure 2, the compression sleeve 15 has an annular connecting area 16, from which extends a pipe-shaped
hose fitting section 17. The hose fitting section 17 is designed as a hollow cylinder and has an inside diameter
which substantially matches the outside diameter of the hose 2. The wall thickness of the hose fitting section 17 is
distinctly smaller than the connecting area 16. On the outside, the not deformed compression sleeve 15 is designed
in a cylindrical manner, i.e., the connecting area 16 and the hose fitting section 17 have the same outside diameter.
At the transition between the connecting area 16 and the hose fitting section 17, a support section 18 is provided,
said support section, together with the hose fitting section, defining an annular shoulder 19. This annular shoulder
is used for the end-face abutment of the hose 2. The support section 18 extends as a radially inward-directed
annular rib up to a narrow cylindrical annular surface 21 having a diameter which substantially matches the

diameter of the peripheral surface 6. The annular surface 21 is one dimension of play greater than the peripheral
surface 6, so that the compression sleeve 15 can be easily slipped onto the connecting nipple 5.
As is obvious, in particular, from Figure 6, adjoining the annular surface 21 is a slanted face 22 forming a chamfer.
Consequently, this chamfer forms a chamfered shoulder toward the cylindrical internal face 23 of the connecting
area 16. The internal face 23 has a chamfer 24 adjoining the axial end face of the connecting area 16. The length
of the internal face 23 in axial direction corresponds approximately to the length L of the annular ring 7. The inside
diameter 23 matches the largest outside diameter of the annular ring 7.
The hose connection is established with the connecting nipple 5 and the compression sleeve 15 as follows:
In order to establish the connection, the hose 2, the compression sleeve 15 and the connecting nipple 5, as
shown by Figure 2, are first slid together, as is obvious from Figure 3. In so doing, the hose 2 is already seated
somewhat tightly on the peripheral surface 6 of the connecting nipple 5. Its face abuts against the annular
shoulder 19. The support section 18 abuts against the annular ring 7. The inside face of the hose fitting section 17
abuts against the outside of the hose 2 or displays minimal play with respect thereto. The internal face 23 abuts
with minimal play against the annular ring 7 and extends beyond said annular ring.
Now, a compression tool, such as, for example a jointing clamp, or a revolving compression tool moving rollers on
an orbital path about the compression sleeve 15 and, in so doing, exerting inward pressure, is used to cause a
radial deformation of the compression sleeve 15. In so doing, the hose fitting section 17, as well as the connecting
area 16, is plastically deformed in radially inward direction. In so doing, the hose fitting section 17 is pressed
inward, specifically in at least one and preferably more, annular zones 26, 27. As a result of this, the hose fitting
section 17 is imparted with a wavy shape in longitudinal section. Consequently, as is obvious from Figure 7, in
particular, the hose 2 is pressed tightly against the peripheral surface 6 of the connecting nipple 5, thereby
achieving fluid-tightness.
During the deformation of the connecting area 16, in particular, the section being in radial alignment with the
annular ring 7 is pressed radially inward, in which case the external circumference of the connecting area 16
remains substantially cylindrical. The support section 18 is not deformed radially inward. In so doing, the annular
face 21, however, is still pressed slightly inward and thus comes into tight contact with the peripheral surface 6 of
the connecting nipple 5. The remaining material of the connecting area 16 flows around the annular ring 7,
enclosing it in a form-closed manner. In so doing, the plastic deformation of the connecting area 16 is relatively
minimal. During the deformation, the face 25 is - and remains - at one height with the edge 8 and thus is flush
with the annular ring 7. In so doing, after the completed deformation, the connecting area 16 forms an edge 28, on
which the area of the face 25 in abutment with the annular ring 7 subtends an acute angle of 50°, for example.
Due to the support of the connecting area over the support section 18 on the connecting nipple 5, a flattening of
the annular ring 7 is avoided during the plastic deformation of the connecting area 18. Rather, the material of the
connecting area 16 abuts in a flat manner against the annular ring 7 and flows around annular ring. Thus, a tight
seal and an axially form-closed securing of the compression sleeve 15 and the hose 2 on or at the connecting
nipple 5 is achieved.

Above, the inventive connecting device 1 has been described with respect to a screw nipple. However, as already
mentioned, the compression sleeve 15 can also be used for affixing the hose 2 to a pipe provided with an annular
ring 7, as is obvious from Figure 4. Referring to the embodiment shown in Figure 4, the above descriptions use
the same reference numbers and are applicable accordingly.
A connecting device 1, consisting of a connecting nipple 5 with an annular ring 7 and a compression sleeve 15,
has a particularly short design, in that the compression sleeve 15 has a connecting area 16 having a substantially
square cross-section, whereby said connecting area 16 is pressed onto the annular ring 7. In so doing, the
connecting area 16 ensures the axial attachment of the compression sleeve to the connecting nipple 5. The latter
encloses and extends beyond the annular ring 7. However, it does not engage behind it, i.e., it does not have a
section extending beyond the annular ring 7. As a result of this, the connecting device 1 is particular short in axial
direction and makes a long sealing length possible. The total length of the connecting device 1 is exclusively
defined by the length of the peripheral surface 6 that is used to provide the seal with respect to the axial length of
the annular ring 7. No additional space for sections extending potentially behind the annular ring 7 is required.

WE CLAIM
1. Connecting device (1) for the connection of a hose (2) to fluid-transporting lines or
assemblies (3), comprising
a connecting nipple (5) comprising a fluid channel and a jacket surface (6) having
the form of a cylinder or a truncated cone, said barrel surface being provided with a
peripheral rounded annular bead (7), a compression sleeve (15) having a hose fitting
section (17) and a securing section (16) that is plastically deformable and associated with
the annular bead (7), said securing section extending over the annular bead (7) in order
to secure the compression sleeve (15) in axial direction on the connecting nipple (5),
characterized in that an axial end face (25) of the securing section (16) is located on the
same level as the edge (8) forming the connection of the annular bead (7) with the
jacket surface (6), and that the end face (25) is thus flush with the annular bead (7).
2. Connecting device as claimed in Claim 1, wherein the securing section (16) has a wall
thickness that is greater than a wall thickness of the hose fitting section (17).
3. Connecting device as claimed in Claim 1, wherein the hose fitting section (17) has the
basic shape of a hollow cylinder and is deformed radially inward by plastic deformation on
a least one point (26, 27).
4. Connecting device as claimed in Claim 3, wherein the hose fitting section (17) has an
inside diameter that substantially corresponds to the outside diameter of the hose (2)
that is to be connected.
5. Connecting device as claimed in Claim 1, wherein the compression sleeve (15) comprises
an annular shoulder (21) between the hose fitting section (17) and the securing section
(16), said annular shoulder being directed radially inward for the end-face abutment of
the hose (2).

6. Connecting device as claimed in Claim 1, wherein the securing section (17) has a
supporting section (18) arranged between the hose (2) and the annular bead (7), said
annular bead being formed by an annular projection that is directed radially inward.
7. Connecting device as claimed in Claim 6, wherein the projection has a narrow cylindrical
radially inward facing annular surface (21), the diameter of said annular surface being
smaller than the outside diameter of the annular bead (7).
8. Connecting device as claimed in Claim 7, wherein the diameter of the annular surface
(21) corresponds to the diameter of the jacket surface (6), with the exception of minimal
play, directly adjoining the annular bead (7).
9. Connecting device as claimed in Claim 6, wherein the annular bead (7) is held in an
axially stable and tolerance-free manner between the support section (18) and the
plastically deformed region (16) of the securing section (17).
10. Connecting device as claimed in Claim 1, wherein the plastically deformed region of the
securing section (16) ends at an acute-angle edge (28), said edge abutting against one
end of the annular bead (7).

ABSTRACT

CONNECTING DEVICE FOR THE CONNECTION OF A HOSE TO FLUID
TRANSPORTING LINE
The invention relates to a connecting device (1) which consists of a connecting nipple (5)
having an annular ring (7) and a compression sleeve (15). The aim of the invention is to
provide a particularly compact connecting device. For this purpose, the compression
sleeve (15) has a connecting area (16) with a substantially square cross-section which is
forced onto the annular ring (7) by pressure. The securing area (16) axially fastens the
compression sleeve to the connecting nipple (5), however, without engaging behind it,
i.e. it is provided with a section that extends beyond the annular ring (7). The connecting
device (1) is therefore especially compact in the axial direction and allows for a bigger
sealing length. The overall length of the connecting device (1) is exclusively determined
by the length of the peripheral surface (6) serving for sealing in relation to the axial
length of the annular ring (7). The connecting device does not require any additional
sections engaging behind the annular ring (7).

CONNECTING DEVICE FOR THE CONNECTION OF A HOSE TO FLUID TRANSPORTING LINE

Documents:

Inventors:

PCT Conventions: