Cam locking device and method for manufacturing such a device and method for replacing a wire element of such a device

Abstract

A cam-operated locking device comprising: a head subassembly (1) including a head (3) equipped with a cam (4) and a rod subassembly (2) having a rod (5) and at least one wire element (6). The wire element (6) passes through the rod (5). The rod (5) defines a through hole (8) for receiving a connector. The wire element (6) defines the through hole (8). The wire element (6) defines at least one loop (6a) that attaches to the head (3) to form mechanical continuity between the head (3) and the anchor point. At least one loop (6a) is traversed by a tube (7). The tube (7) and at least one loop (6a) are traversed by an anchor (9) fixed to the head (3) to form mechanical continuity between the head (3) and the anchor point.

Description

technical field

[0001] The invention relates to a cam locking device, a method for manufacturing a cam locking device and a method for replacing a wire element of a cam locking device. Previous technique

[0002] During climbing, a climber places protection points on a rock face. The climber successively installs several protection points designed to support them in case of a fall. Some rock faces are equipped with pre-installed protection points, for example, in the form of bolts that are anchored into the rock. Other rock faces are not equipped with such points, so the climber must find the most suitable crevice for placing their protection point.

[0003] When a climber needs to place protection, it's common to use passive and active cams. Cams are designed to fit into crevices, which are generally holes, cracks, gullies, or any other hollow deep enough to allow the insertion of a cam. Each particular crevice shape is suited to a specific cam configuration. Conventionally, for cams, the head is positioned at one end and is designed to jam. The opposite end defines a through-hole for a carabiner. This through-hole is usually marked by a steel cable. The steel cable is embedded in the head at one or more points and / or swaged to create the loop for the carabiner.

[0004] Passive camming devices are often made of metal pieces with a specific shape. In passive camming devices, the overall size remains constant or nearly constant during use. In one spatial position, the device can fit into a crack in a rock face, and in a second spatial position, it wedges itself between two opposite faces of the crack. Il It is then possible to install and remove the camming device, or to wedge the device, provided it is positioned correctly within the hole. For some types of passive camming devices, the steel cable is replaced by a webbing made of textile material. The webbing forms a loop that is closed by stitching after the webbing has passed through the head several times.

[0005] The various configurations currently on the market do not allow for the replacement of the material(s) forming the ring relative to the head. Consequently, if the ring is damaged or worn, the entire camming device must be replaced.

[0006] Historically, it has been known to form a ring made from a strap or rope that passes through the head subassembly and is closed with a knot. Closing the ring with one or more knots presents problems with repeatability and durability, especially when using materials with a low coefficient of friction, which prevents the knots from holding securely over time.

[0007] In active camming devices, one or more cams are used to adjust the size of the camming device's head. It is also common for active camming devices to permanently secure one end of a steel cable within a part of the head. The other end of the cable is formed into a loop which is then crimped closed.

[0008] IlThis is also known as active camming devices that use a mechanical connection between the head and the ring end by means of a textile wire element that forms a loop by splicing the two ends of the wire element together. The wire element passes through the shaft before forming the loop. The loop is then attached to the camming device head. This configuration makes attaching the textile wire element to the head difficult because the available space is limited and the cam rotation axes are roughly at the same height as the insert, so the insert is positioned between the cams in its extended position. Furthermore, because the shaft is formed and the wire element is under tensile stress, securing the wire element to the head complicates the operation.

[0009] This design makes replacing the wire element very difficult, if not impossible, if it is damaged or reaches the end of its lifespan. Because the wire element is made of textile material, it ages much faster than the entire head assembly. The lifespan of the camming device is therefore determined by the lifespan of the wire element.

[0010] US document 2006 / 231708 A1 describes a cam device comprising a pair of lobes, a shaft per pair of lobes, a rod, a loop, and a release mechanism. Object of the invention

[0011] One object of the invention is to provide a cam locking device in which the mechanical link between the head and the annular end is more easily replaceable than prior art configurations.

[0012] The invention is defined in the claims.

[0013] According to one aspect of the invention, the cam locking device comprises: A head subassembly including a head equipped with at least one cam designed to wedge into a crevice; a stem subassembly having a stem and at least one wire element, the stem being hollow and traversed by at least one wire element, the stem subassembly defining a through hole for receiving a connector to form an anchor point, the at least one wire element defining the through hole, the wire element defining at least one loop that attaches to the head subassembly to form mechanical continuity between the head and the anchor point. The cam wedge is notable in that at least one loop is traversed by a tube and in that the tube and at least one loop are traversed by an anchor fixed to the head to form mechanical continuity between the head and the anchor point.

[0014] Advantageously, the anchor is detachable from the head or destructible independently of the head to allow separation between the head subassembly and the stem subassembly.

[0015] In a particular configuration, the wire element is subjected to a tensile force along a longitudinal direction of the rod and the wire element, the rod forming a stop opposing a movement of the tube towards the through hole.

[0016] In an advantageous development, the wire element has several loops, the loops being traversed by the tube and the anchor.

[0017] Preferably, the tube is breakable and fixedly mounted in the head. Removing the tube from the head will destroy it.

[0018] In one embodiment, the anchor is a screw. At least one of the head and the tube has a thread receiving a thread of the screw to fix the anchor to the head.

[0019] In an advantageous development, the anchor is an insert crimped with the head.

[0020] Preferably, the anchor is a rod fixed to the head by means of a non-removable clip.

[0021] In another advantageous development, the wire element is a ring made of textile material.

[0022] Preferably, the wire element is a bent ring to define at least two legs, each comprising a head end, a foot end, and two strands. in which the two strands meet at the head end to form a loop attached to the head, in which the foot end of each leg is extended by a connecting portion, the connecting portion connecting the legs together, the connecting portion delimiting said through hole, the connecting portion comprising at least four strands of the wire element; in which the loops are traversed by the tube.

[0023] Advantageously, at least one cam is mounted to pivotally movable relative to a head body between an extended and a retracted position, the anchoring being fixed to the body and a spring being fixed on one side to the body and on the other to the cam to be able to actuate the cam out of the extended position.

[0024] The invention also relates to a method for manufacturing a cam locking device which is easier to produce than the methods of the prior art.

[0025] This result is achieved through a manufacturing process comprising the following steps: provide a head subassembly including a head equipped with at least one cam for wedging into a recess; provide a rod subassembly having a rod and at least one wire element, the rod being hollow and traversed by at least one wire element, the rod subassembly defining a through hole for receiving a connector to form an anchor point, the at least one wire element defining the through hole, the wire element defining at least one loop, the at least one loop being traversed by a tube; attach an anchor to the head, the anchor traversing the tube and the at least one loop to hook the at least one loop to the head subassembly and form mechanical continuity between the head and the anchor point

[0026] The invention also relates to a method for replacing a wire element of a cam locking device which is easier to implement than in prior art configurations.

[0027] This result is to be achieved through a replacement process comprising the following steps: provide a cam locking device according to any of the preceding configurations; remove the anchor and separate the rod subassembly from the head subassembly; provide a new rod subassembly having a rod and at least one wire element, the rod being hollow and traversed by at least one wire element, the rod subassembly defining a through hole intended to receive a connector to form an anchor point, at least one wire element defining the through hole, the wire element defining at least one loop hooking onto the head subassembly to form mechanical continuity between the head and the anchor point, at least one loop being traversed by a tube; fix the rod subassembly to the head subassembly by means of an anchor fixed to the head and traversing the tube and at least one loop to form mechanical continuity between the head and the anchor point. Brief description of the drawings

[0028] Other advantages and features will become clearer from the following description of particular embodiments and implementations of the invention, given by way of non-limiting examples and shown in the accompanying drawings, in which: there figure 1 schematically illustrates a perspective view of a cam-locking device; the figure 2 schematically illustrates an exploded perspective view of a cam-locking device according to a first embodiment; the figure 3 schematically illustrates a perspective view of the rod head end with a tube of the cam locking device according to the first embodiment; the figure 4 schematically illustrates a cross-sectional view of the connection between the head subassembly and the rod subassembly of the cam locking device according to the first embodiment; the figure 5schematically illustrates an exploded perspective view of a cam-locking device according to a second embodiment; the figure 6 schematically illustrates a perspective view of the rod head end with a tube of the cam locking device according to the second embodiment; the figure 7 schematically illustrates a cross-sectional view of the connection between the head subassembly and the rod subassembly of the cam locking device according to the second embodiment; the figure 8 schematically illustrates an exploded perspective view of a cam locking device according to a third embodiment; the figure 9 schematically illustrates a perspective view of the rod head end with a tube of the cam locking device according to the third embodiment; the Figure 10schematically illustrates a cross-sectional view of the connection between the head subassembly and the rod subassembly of the cam locking device according to the third embodiment; the figure 11 schematically illustrates an exploded perspective view of a cam locking device according to a fourth embodiment; the figure 12 schematically illustrates a perspective view of the rod head end with a tube of the cam locking device according to the fourth embodiment; the figure 13 schematically illustrates a cross-sectional view of the connection between the head subassembly and the rod subassembly of the cam locking device according to the fourth embodiment; the figure 14 schematically illustrates a perspective view of a wire element ring intended to connect the head and the annular end of the cam-locking device before it is folded; the figure 15schematically illustrates a perspective view of a ring made of bent wire such that two pairs of strands are intended to connect the head and the annular end of the cam-locking device; the figure 16 schematically illustrates a perspective view of a ring made of bent wire element so that four pairs of two strands are intended to connect the head and the annular end of the cam locking device. Description of the implementation methods

[0029] THE figures 1 to 13 illustrate different embodiments of a cam locking device, also known as a "cam locker". The cam locking device is preferably an active locking device.

[0030] The cam locking device comprises a head subassembly 1 and a rod subassembly 2. The head subassembly 1 is located at a first end and it comprises a head 3 and at least one cam 4. The head subassembly 1 is intended to wedge itself into a crevice.

[0031] The rod subassembly 2 comprises a rod 5, a wire element 6, and a tube 7. The rod 5 is hollow and the wire element 6 passes through it. The rod subassembly 2 defines an annular end 2a with a through hole 8. The wire element 6 delimits the through hole 8. In other words, the wire element 6 surrounds the through hole 8, either alone or in combination with its attachment point(s) to the head 3. Once the wire element 6 is attached to the head 3, it ensures mechanical continuity between the head 3 and the opposite end of the jammer, represented by the through hole 8, which serves as an anchor point, i.e., a connector. The rod 5 extends primarily along a first direction XX, which corresponds to the longitudinal direction of the rod 5, i.e., its longest dimension.The rod 5 has a head end intended to be fixed to the head 3 and a foot end intended to define an annular end 2a defining the through hole 8. The foot end and the head end are opposite along the direction XX.

[0032] The connection between the wire element 6 and the head 3 makes it easier to separate the head sub-assembly 1 and the rod sub-assembly 2 in order to facilitate the replacement of the wire element 6 and more generally of at least one of the components of the rod sub-assembly 2.

[0033] The wire element 6 defines at least one loop 6a, and the tube 7 passes through at least one loop 6a. The tube 7 and at least one loop 6a are traversed by an anchor 9, which is fixed to the head 3. The anchor 9 provides the mechanical connection between the wire element 6 and the head 3. To facilitate the total or partial replacement of the rod subassembly 2, it is important to facilitate the installation of the wire element 6 in the head 3.

[0034] The tube 7 prevents the loop 6a from closing, which facilitates the installation of the anchor 9 in the loop 6a to ensure mechanical continuity between the head 3 and the rod sub-assembly 2. The tube 7 forces the loop 6a to define a minimum cross-section that is substantially equal to or greater than the cross-section of the anchor 9. When the loop 6a is mounted in the head 3, the loop 6a rubs against the head 3 and may deform, but it maintains an opening substantially equal to or greater than the cross-section of the anchor 9 to allow the anchor 9 to engage with the head 3 and with the wire element 6 through the tube 7.

[0035] In a preferred embodiment illustrated in figures 2 to 13The tube 7 is positioned at least partially projecting from the rod 5 and sufficiently so that the cross-section of the inner hole in the tube 7 is suitable for receiving the anchor 9. The tube 7 separates the wire element 6 from the anchor 9, thus protecting the mechanical integrity of the wire element 6 from the surface of the anchor 9. In an alternative embodiment, the tube 7 is positioned within the rod 5, and the rod 5 has at least one hole opposite the tube 7 in the direction of insertion of the anchor 9. The hole in the rod 5 allows the anchor 9 to pass through the rod 5, the loop 6a, and the tube 7. Preferably, the rod 5 defines two opposite holes that allow the anchor 9 to pass through the tube 7 and the rod 5 to attach to the head 3 at two points.

[0036] The head 3 has a body 3a defining a cavity receiving a head end of the rod 5. The tube 7 is completely hidden by the body 3a in a direction perpendicular to the direction of insertion of the head end into the cavity.

[0037] Preferably, the position of the tube 7 relative to the end of the head of the rod 5 is stationary along the direction XX.

[0038] The head 3 defines a cavity, for example a blind cavity, which is intended to receive the rod 5, the tube 7 and the loop 6a. In order to maintain acceptable compactness, the cavity has a reduced cross-section and preferably a cross-section which is complementary to the cross-section of the rod 5 perpendicular to the first direction XX.

[0039] Preferably, the tube 7 has a width that is equal to or greater than the width of the rod 5, as illustrated in figures 2 to 13By using a tube 7 at least as wide as the rod 5, it is easier to force the rod 5 into position to insert the tube 7 in the desired direction XX. The tube 7 butts up against the rod 5, and the rod 5 is used to guide the tube 7 into the insertion hole of the anchor 9. Alternatively, the cross-section of the assembly formed by the tube 7 and the loop 6a is greater than the internal cross-section of the rod 5.

[0040] In a particularly advantageous manner, the wire element 6 is entirely hidden inside the rod 5 except for the loop 6a or loops 6a which protrude from a part of the head 3 of the rod 5. The part of the head 3 of the rod 5 is intended to fit into the head 3.

[0041] In one particular embodiment, the anchor 9 is mounted in a removable manner relative to the head 3. For example, the anchor 9 is a screw, a bolt, or any other element that can be mounted to the head 3 and removed multiple times. Such a configuration allows for easy separation of the rod subassembly 2 and the head subassembly 1.

[0042] In an alternative embodiment, the anchor 9 is mounted in a destructible manner independently of the head 3. The anchor 9 can be destroyed relative to the head 3 without destroying the head 3. Such a configuration allows for the successive mounting of several subassemblies of rod 2 onto the same subassembly of head 1 by replacing the anchor 9 with a new anchor 9. The destruction of the anchor 9 allows for the replacement of the subassembly of rod 2 and encourages the installation of a kit containing a new anchor 9 and a new wire element 6. The anchor 9 can be an insert that is crimped, glued, welded, brazed, or fixed by any other non-removable means.

[0043] In the preceding embodiments, the tube 7 is preferably breakable and is fixedly mounted in the head 3. Extraction of the tube 7 from the head 3 and / or removal of the anchor 9 causes destruction of the tube 7.

[0044] Preferably, when the anchor 9 is fixed to the head 3, the tube 7 is permanently fixed to the anchor 9. Removing or destroying the anchor 9 destroys the tube 7. This prevents or makes it more difficult to reuse the tube 7. It is then possible to detect a wire element 6 that has already been used because it has already been installed. For example, the anchor 9 has a cross-section slightly larger than the cross-section of the through hole 8 in the tube 7. As the anchor 9 is inserted into the tube 7, the tube 7 fractures, preventing its reuse. Alternatively, once the anchor 9 is fixed to the head 3, a portion of the anchor 9 is fixed to the tube 7. The attachment between the anchor 9 and the tube 7 is unidirectional. When attempting to remove anchor 9, tube 7 is destroyed. It is still possible to have an anchor 9 that grinds away part of the thickness of tube 7.The introduction of anchor 9 reduces the thickness of tube 7, which weakens tube 7, making it unable to prevent the strap from deforming and complicating the further introduction of anchor 9.

[0045] In a particular embodiment, the wire element 6 is subjected to a tensile force along the longitudinal direction XX of the wire element 6 between the head 3 and the through hole 8. The rod 5 acts as an end stop on the tube 7. The rod 5 prevents the tube 7 from approaching the through hole 8 beyond a threshold position. The wire element 6 is under tension, which allows the position of the strap relative to the tube 7 to be fixed. The tensioned assembly of the wire element 6 ensures the long-term stability of the rod subassembly 2 before it is attached to the head subassembly 1. A rod 5 with an adjustable length can be used to apply a tensile force.

[0046] In a preferred embodiment, the wire element 6 has several loops 6a. Each of the loops 6a is attached to the head 3. Advantageously, the loops 6a are mounted opposite each other and are traversed by a tube 7 and the same anchor 9.

[0047] In one particular embodiment, the anchor 9 is a screw. In the configuration illustrated in figures 2 to 4 The screw thread 9a fits into the thread 3b of the head 3. The anchor 9 bears against the head 3 on either side of the rod 5. In the configuration illustrated in figures 5 to 7The screw thread 9a fits into the thread 7a of the tube 7. The anchor 9 bears against the head 3 on either side of the rod 5. It is advantageous to prevent the tube 7 from rotating around the axis of insertion of the anchor 9 into the tube 7. A rotation lock is used, formed partly by the tube 7 and partly by the rod 5 and / or the head 3. In one configuration, the rod 5 forms a lug 5a that fits into a hole in the tube 7 to prevent rotation. Alternatively, the external shape of the tube 7 is non-circular. The rod 5 and / or the head 3 have a shape complementary to that of the tube 7, which prevents the tube 7 from rotating.

[0048] In the configuration illustrated in figures 8 to 10Anchor 9 defines a groove 9b. Anchor 9 passes through tube 7 and loop(s) 6a. The end of anchor 9 defining the groove passes through head 3 and tube 7. A clip 10 is inserted into groove 9b to lock anchor 9 to head 3 and prevent its removal. Anchor 9 bears against head 3 on either side of rod 5. Removing clip 10 is necessary to remove anchor 9. Preferably, removing clip 10 corresponds to clip 10 breaking.

[0049] In the embodiment illustrated in figures 11 to 13The anchor 9 has a shaft 11 and a locking device 12. The head 3 defines one or two holes with a first cross-section larger than the cross-section of the shaft 11. This allows the shaft 11 to be inserted into the head 3. Once the shaft 11 is inserted into the head 3, a locking device 12 is attached to the head 3, reducing the cross-section to a second cross-section value smaller than the cross-section of the shaft 11. The shaft is then locked in the head 3. In the uninstalled position of the locking device 12, the hole(s) intended to receive the shaft 11 present a first value greater than the cross-section of the shaft 11. In the installed position of the blocker 12, the hole(s) intended to receive the shaft 11present a second value lower than the cross-section of shaft 11. Depending on the configuration, the blocker 12 can be mounted removable or non-removable. Preferably, in the installed position, the blocker 12 cannot be removed from the head 3 without breaking the blocker 12. The shaft 11 rests on the head 3.

[0050] In a preferred embodiment, the cam locking device is an active locking device as illustrated in figures 1 to 13 .

[0051] The head subassembly 1 forms a first end, which is a head 3. The rod subassembly 2 forms the end opposite the head end 3 and defines an annular end 2a. The head 3 has at least one cam 4, and preferably several cams 4, which are mounted to pivotally move between an extended and a retracted position. The cam(s) 4 are mounted to pivot about at least one pivot shaft 13 of the head 3. The cam(s) 4 are mechanically coupled to a body 3a of the head 3. The pivot shaft 13 is fixed to the body 3a of the head 3. The body 3a may be formed by one or more parts. At least one cam 4 is mounted to pivot about the body 3a. The pivot shaft 13 extends mainly along a second direction YY, which is perpendicular or substantially perpendicular to the first direction XX.

[0052] Conventionally, the annular end 2a is shaped like a ring with a through hole 8 configured to receive a carabiner. The annular end 2a is capable of supporting the weight of a user.

[0053] The cam-locking device has a wire element 6 that mechanically connects the head 3 with the annular end 2a. The wire element 6 extends continuously from the head 3 to the annular end 2a in a first direction XX. The wire element 6 is attached to the head 3 at each end and extends along the annular end 2a between its points of attachment to the head 3. The wire element 6 ensures mechanical continuity between the head 3 and the annular end 2a. The wire element 6 mechanically couples the cams 4 to the annular end 2a so that a user attached to the annular end 2a is restrained by means of the cams 4, which are wedged, for example, in a crack.

[0054] The locking device includes an actuation system coupled to at least one cam 4. The actuation system is configured to selectively engage the retracted position of at least one cam 4. The actuation system has a trigger 14 sliding mounting along the first direction XX connecting the head 3 and the annular end 2a.

[0055] In other words, the trigger 14 is mounted movably relative to the head 3 and is coupled to at least one cam 4. When the trigger 14 is out of a first position, at least one cam 4 is out of the extended position.

[0056] Preferably, the trigger 14 is coupled to at least one cam 4 so that the movement of the trigger 14Moving away from the head 3 causes at least one cam 4 to move out of the extended position, i.e., towards the retracted position. Preferably, the trigger 14 is coupled to all 4 cams so that the movement of the trigger 14 in moving away from head 3 causes cams 4 to move towards the retracted position.

[0057] Il is advantageous than a trigger movement 14 towards head 3 does not impose any movement of cam 4 and in particular does not impose a movement of cam 4 towards the extended position.

[0058] In a preferred embodiment, the trigger 14 is slidably mounted along the wire element 6 between the head 3 and the annular end 2a. The trigger 14 can be coupled to the cam 4 or to each cam 4 by an additional wire element 15. The additional wire element 15 can be a metal cable, a textile element, or a wire element made of a synthetic material, for example, plastic. The additional wire element 15 couples the cam 4 to the trigger 14 and allows a movement of the trigger 14 towards the annular end 2a to be translated into a movement of the cam 4 towards the retracted position.

[0059] The cam locking device has a spring 16 configured to move at least one cam 4 towards its extended position. The spring 16 can be manufactured using any technology; it can be a helical spring operating in tension, compression, torsion, or bending. It can also be a metal leaf or wire that is elastically deformed. In the absence of any load or obstruction, the spring 16 places the cam(s) 4 in the extended position. The force applied to the trigger 14 to move it away from the head 3 corresponds to a force applied to the spring 16 to move the cam(s) 4 towards the retracted position. In one embodiment, the spring 16 is fixed on one side to the cam 4 and on the other side to the head 3. In another embodiment, the spring 16 is fixed on one side to a first cam 4 and on the other side to a second cam 4 mounted on a different pivot shaft 13 than the first cam 4.The locking device may include as many springs 16 as cams 4 or as many springs 16 as pairs of cams 4.

[0060] Preferably, the cam locking device comprises at least one rod 5 extending from the head 3 towards the annular end 2a, i.e., along the first direction XX. In the embodiments illustrated in figures 1 to 13 The cam locking device comprises a single rod 5 which extends longitudinally along the first direction XX. Preferably, the rod 5 is abutted against the head 3 or is fixed to the head 3.

[0061] Advantageously, the stem 5 defines at least partially the through hole 8 of the annular end 2a.

[0062] The rod 5 is hollow and is traversed by the wire element 6 to connect the annular end 2a with the head 3. Preferably, the rod 5 is more rigid than the wire element 6 perpendicular to the direction XX, which allows the cam locking device to be held by means of the rod 5 and the locking device to be positioned precisely in a crack compared to an equivalent device without the rod 5. Preferably, the rod 5 extends continuously from the head 3 to the annular end 2a so as to provide good mechanical strength when the locking device is held by the annular ring 2a and the trigger 14. Il is advantageous than the trigger 14 either mounted sliding along the rod 5 and the rod 5 separates the wire element 6 and the trigger 14. The rod 5 allows the wire element 6 to be protected out of the head 3 up to the annular end 2a.

[0063] As illustrated in the figure 14 , The wire element 6 is in the form of a ring, preferably a ring made of textile material. The ring is formed by a strand whose first end is fixed to a second opposite end. Il It is advantageous for the ring to be closed by sewing. The two ends of the wire element 6 are held securely together by a seam. Sewing is a well-established process, which facilitates the production of a ring with controlled tensile strength. Using a sewing step allows for the creation of a ring that is less expensive and has a more precise dimension than its equivalent obtained by splicing. Il It is advantageous that the ring be free of crimping and splicing. The wire element 6 can be a strap or a rope.

[0064] The textile material ring can be a polyethylene ring with a very high molar mass, for example in a material marketed under the names Dyneema ®< or Spectra ®< .

[0065] There figure 14 This illustrates a wire element 6 in the form of a ring. The ring is bent to define at least two legs 6b, each having a head end and a foot end. Each leg 6b has two strands. The two strands meet at the head end to form a loop 6a. The loop 6a is intended to be attached to the head 3. The foot end of each leg 6b extends into a connecting portion 6c. The connecting portion 6c joins the legs 6b together. The connecting portion 6c defines the through hole 8 of the ring end 2a.

[0066] The strands of each leg 6b extend to one side or the other to form a loop 6a or a connecting portion 6c. A loop 6a extends one strand with another strand of the same leg 6b. The connecting portion 6c extends one strand with a strand of another leg 6b. In other words, each strand connects one end of a loop 6a with the connecting portion 6c. The connecting portion 6c has at least four strands of the wire element 6. The connecting portion 6c has twice as many strands as loops 6a. Preferably, each strand of the connecting portion 6c is mounted to slide relative to the others.

[0067] There figure 15illustrates the wire element 6 bent to define a U shape with two legs 6b connected by a connecting portion 6c. The two legs 6b terminate in a loop 6a at the end opposite the connecting portion 6c. The two legs 6b are deformed so that the loops 6a face each other to define a through hole 8.

[0068] As illustrated in figures 3, 4 , 7, 8 , 11 And 12The wire element 6 is in the form of a ring that is bent and shaped into a U. The two legs 6b are brought together, while the connecting portion 6c defines a ring with a through hole 8 to define the annular end 2a of the locking device. When the loops 6a are attached to an anchor 9, applying a force to the connecting portion 6c causes stress on the multiple strands that connect the connecting portion 6c and the anchors 9. The wire element 6 provides the tensile strength.

[0069] The loops 6a are attached to the head 3, and the connecting portion 6c defines the through hole 8 of the annular end 2a. The strands of the wire element 6 ensure mechanical continuity between the head 3 and the annular end 2a. This embodiment is particularly advantageous because the attachment of the head 3 to the wire element 6 is achieved using the loops 6a. Ilthere is no need to fix the wire element 6 to the head 3 with a knot, a splice step, a seam, a crimp or any other technological step which alters the mechanical integrity of the wire element 6.

[0070] The wire element 6 at least partially delimits the through hole 8 of the annular end 2a by means of the connecting portion 6c which avoids the formation of a specific loop 6a by a knot, a splicing step, a stitch, a crimping or any other technological step which modifies the mechanical integrity of the wire element 6.

[0071] The wire element 6 has at least two loops 6a attached to the head 3, that is, directly attached to the head 3 and connected by at least two strands extending continuously along the stem 5 and defining the through hole 8 of the annular end 2a. The annular wire element 6 ensures the mechanical continuity of the locking device. This technical solution is more advantageous than that presented in US patent 10,143,892, which uses a splicing step to form two loops 6a intended respectively for attaching the head 3 and for defining the through hole 8 of the annular end 2a.

[0072] There figure 16This illustrates another type of folding of the ring-shaped wire element 6. The head 3 and the ring end 2a are connected by more than four strands of wire element 6. In the illustrated configuration, the head 3 and the ring end 2a are connected by eight strands. The wire element 6 defines four legs 6b, each formed by two strands and thus a loop 6a. Other arrangements are possible.

[0073] To ensure good mechanical strength, the ring is preferably knot-free in the legs 6b and / or in the head 3. The loops 6a are extended at their ends by strands which come from or extend to the annular end 2a and not by a knot formed at the end of the wire element 6.

[0074] THE figures 3, 4 , 7, 8 , 11 , 12 and 15illustrate a ring which is folded once to form four strands of the wire element 6 which connect the annular end 2a and the head 3. Different types of folds are usable so that the ring in wire element 6 defines a connecting portion 6c suitable for delimiting at least partially the annular end 2a and extending at least two legs 6b intended to extend to the head 3 and ending with loops 6a to attach to the head 3.

[0075] The stem 5 is traversed by at least four strands of the wire element 6 between the head 3 and the annular end 2a. The four strands are mechanically connected by means of the connecting portion 6c and the loops 6a. The connecting portion 6c ensures mechanical continuity between the legs 6b. Preferably, the seam is located within the connecting portion 6c to minimize bulk in or near the head 3.

[0076] Each loop 6a in the head 3 is fixed to the head 3. Preferably, each attachment point between a loop 6a and the head 3 allows the wire element 6 to slide relative to the head 3. When the wire element 6 is under tension, the tensile forces are balanced between the strands by the sliding of the loops 6a. Preferably, the connecting portion 6c allows the individual strands to slide relative to each other to facilitate force balancing.

[0077] Applying a tensile force between the head 3 and the annular end 2a puts the wire element 6 under tension, and in particular the at least four strands of the wire element 6 that connect the head 3 to the annular end 2a. Increasing the number of strands allows for a better compromise between tensile strength along the XX direction, the space required inside the rod 5, and flexibility perpendicular to the XX direction.

[0078] US patent 2004 / 0035992 uses a 6a webbing loop that is flexibly mounted in a hollow stem. The maximum length of the 6a loop is approximately half the webbing length. During the manufacturing of the 6a loop, there is a deviation in the cut webbing length and in the stitching length / position from the target value. When multiple 6a loops are made, this results in a dispersion of the 6a loop length around a target value. When not in use, the cam-locking device hangs from the webbing. IlIt appears that the variations in the length of loop 6a mean that the cam locking devices are not as identical and interchangeable as expected, and that this can complicate the removal of the cam locking device. Using a wire element folded to form a U-shape effectively reduces by at least half the final manufacturing variation in the final length between the anchor point 9 with the head 3 and the annular end.

[0079] US patent 10,143,892 uses a simple textile ring formed by splicing. Again, compared to the prior art, the use of a folded wire element to form a U-shape effectively halves the manufacturing risk along the final length between the anchor point 9 with the head 3 and the ring end. It is also important to remember that the splicing step is time-consuming and expensive compared to a simple stitched fastening where the two strands are placed one on top of the other, not one inside the other—that is, without splicing.

[0080] In the figures 2 , 5 , 8 And 11 ,The legs 6b are deformed by an angle of 90%, such that the through hole 8 defined by the loops 6a is offset by 90° relative to the through hole 8 defined by the connecting portion 6c. The offset angle can be represented by the angle between the median cutting planes allowing observation of a ring. The angular offset corresponds to a rotation around the axis XX.

[0081] Different embodiments are possible for fixing the loops 6a of the wire element 6 with the head 3.

[0082] In a particular embodiment, the head 3 has at least one anchor 9, for example, an anchor shaft. The loops 6a are attached to at least one anchor 9 to achieve mechanical continuity between the head 3 and the wire element 6. Preferably, the wire element 6 goes around the anchor 9 to achieve mechanical continuity with the annular end 2a. More preferably, the loop 6a constricts the anchor 9 to achieve mechanical continuity.

[0083] In the embodiments illustrated in figures 1 to 13 , different attachment configurations of the wire element 6 to the head 3 are illustrated.

[0084] THE figures 2 to 13These illustrate embodiments where the loops 6a extending from the legs 6b form two parallel and offset planes. The loops 6a are mounted opposite each other in a direction perpendicular to the parallel planes to form a through hole 8. An anchor 9 of the head 3 passes through the loops 6a to fix the wire element 6 to the head 3. A configuration with two or more loops 6a is possible.

[0085] THE figures 2 to 13 illustrate an embodiment in which the loops 6a at the ends of the ring legs 6b are arranged opposite each other in a direction perpendicular to the first direction XX. An anchor shaft passes through the two loops 6a in the direction perpendicular to the first direction XX. The anchor shaft is fixed to the body 1a. The anchor shaft is different from the pivot shaft(s) 13 of the cam 4 by at least one degree.

[0086] It is particularly advantageous to have a removable anchor 9 mounted on the head 3, allowing for the easy replacement of the wire element 6. Removing the anchor 9 eliminates the connection between the wire element 6 and the head 3, thus enabling the replacement of the wire element 6.

[0087] It is advantageous for the anchor 9 to be an anchor shaft, i.e. a rod 5 which is inserted into the body 1a to fix the loops 6a. The anchor shaft advantageously has a circular cross-section and advantageously a smooth surface.

[0088] For example, the anchor shaft is fixed to the body 1a of the head 3 by screwing, crimping, or riveting. The anchor shaft extends mainly in a direction perpendicular to the first direction XX.

[0089] To replace the wire element 6, the anchor 9 is removed, and the wire element 6 is pulled out in the first direction XX. Depending on the configuration, the rod 5 is either retained or replaced. A new wire element 6 is installed with loops 6a that fit into the head 3. The anchor 9, or a new anchor 9, passes through the loops 6a and attaches to the head 3 to secure the wire element 6 to the head 3. Replacing the wire element 6 is straightforward and requires no intervention on the cams 4, the pivot shaft(s) 13, or the trigger 14.

[0090] In one particular embodiment, the rod 5 has an adjustable length along the XX direction. Adjusting the length allows for an increased length of wire element 6 relative to the rod 5 during the assembly phase. Once the loops 6a are attached to the head 3, the length of the rod 5 is increased to accommodate the excess wire element 6. This provides improved ergonomics between the head 3 and the ring end 2a without altering the tensile strength between the head 3 and the ring end 2a.

[0091] The adjustable-length rod 5 can be a telescopic rod. However, other embodiments are possible.

[0092] Preferably, the annular end 2a is fitted with a stiffener 17 that defines, at least in part, the shape of the annular end 2a. The stiffener 17 defines a shape that is, or is close to, a ring. The stiffener 17 is hollow. The wire element 6 passes through the stiffener 17, which defines the connecting portion 6c of the "U". It is advantageous for the stiffener 17 to form the stop that comes into contact with the rod 5 and prevents the rod 5 from moving away from the head 3 beyond a threshold value. The material forming the stiffener 17 and the shape of the stiffener 17 allow the relationship between the deformation of the stiffener 17 and the value of the compressive force applied to the rod 5 to be defined.

[0093] The embodiment illustrated in the figures allows for easy disassembly to replace at least one of the following components: the wire element 6, the rod 5, or the stiffener 17. In an advantageous embodiment, the rod 5 is removable from the head 3, allowing for the replacement of the rod 5 when it is damaged. The stiffener 17 can also be easily replaced when it is damaged.

[0094] It is still possible to replace the rod 5 and the wire element 6 to adapt the length of the locking device to a specific need. A trigger extender 14 can then be considered if the length of the rod 5 and the wire element 6 is significantly increased.

[0095] The rod 5 is mechanically coupled to the head 3. The stiffener 17 is coupled to the rod 5. It is advantageous that the rod 5 allows the insertion of a portion of the stiffener 17. It is advantageous that the stiffener 17 continuously surrounds the wire element 6 from a first end that abuts against the rod 5 to a second end that abuts against the rod 5. The wire element 6 is completely protected in the protruding portion of the rod 5 which defines the annular end 2a.

[0096] In a particular embodiment, the rod 5 has a flared end which makes it easier to form a ring of substantial size in the annular end 2a.

[0097] The rod 5 is preferably made of polymer material so that it can be flexible in one or more directions perpendicular to the first direction XX.

[0098] In the illustrated embodiments, the cam locking device has four cams 4. It is possible to use more or fewer cams 4. The configurations illustrated for installing the wire element 6 are applicable to locking devices that have one, two, three, four, or more cams 4. The number of cams 4 can be even or odd. The cams 4 are preferably made of metallic material, for example, aluminum alloy or steel.

[0099] The methods of implementation illustrated on the figures 1 to 13These are particularly advantageous because they allow the replacement of the wire element 6, which provides mechanical continuity between the head 3 and the annular end 2a, without having to disassemble the assembly formed by the body 1a, the pivot shafts 13, and the cams 4. This increases safety by preventing incorrect reassembly of the head 3. Furthermore, the ring made of wire element 6 is manufactured in the factory using controlled sewing processes, which ensures good mechanical strength of the wire element 6.

[0100] US patent 2004 / 0035992 discloses a camming device equipped with a simple webbing loop. The loop passes through the cam pivot shaft and extends through the hollow shaft so that it exits on the other side. The webbing loop is installed without tension, allowing the webbing end to protrude at the head 3 and become damaged. To place the device in a crack, the shaft must be held by placing the index and middle fingers on both ends of the trigger and the thumb against the end of the shaft opposite the head 3. Because the webbing is mounted loose, the thumb is expected to press both layers of webbing against the end of the shaft. This configuration is impractical and results in premature wear of the webbing, which is constantly pressed against the shaft.

[0101] It also appears that, according to the instructions in US document 2004 / 0035992, replacing the strap ring necessarily involves dismantling the pivot shaft, which requires a thorough understanding of the reassembly process. Alternatively, the strap is cut, a new strap is inserted, and then a stitching step is performed to define the ring, ensuring mechanical continuity. Here again, a perfect mastery of the stitching processes is necessary, making maintenance by the end user difficult. Il no prior art configuration exists that allows the end user to properly control the maintenance of a cam cleat. IlIt should also be noted that the varying length of the 6a textile buckle necessitates the use of springs to separate the ring end and the stem in order to tension the wire element. The configuration illustrated in US document 2004 / 0035992 demonstrates that replacing the 6a textile buckle requires a splicing step after installing the two springs, making webbing replacement virtually impossible for the average user.

Claims

1. Camming clamping device comprising: - a head sub-assembly (1) including a head (3) provided with a body (3a), at least one cam (4) designed to wedge in a crevice, the at least one cam (4) being installed movable around at least one pivot shaft (13) attached to the body (3a) ; - a rod sub-assembly (2) having a rod (5) and at least one wire element (6), the rod (5) being hollow and passed through by the at least one wire element (6), the rod sub-assembly (2) delineating a through hole (8) designed to receive a connector to form an attachment point, the at least one wire element (6) delineating the through hole (8), the wire element (6) defining at least one loop (6a) attached to the head sub-assembly (1) to constitute a mechanical continuity between the head (3) and the attachment point, the body (3a) defining a cavity receiving an head end of the rod (5); - an anchorage (9) fixed to the body (3a), the anchorage (9) passing through the at least one loop (6a) to form the mechanical continuity between the head (3) and the attachment point, the anchorage (9) being different from the at least one pivot shaft (13); wherein the at least one loop (6a) is passed through by a tube (7) and the tube (7) and the at least one loop (6a) are passed through by the anchorage (9), and wherein the tube (7) is arranged to abut against a head end of the rod (5) installed in the cavity of the body (3a), the anchor (9) being fixed to the head (3) to form mechanical continuity between the head (3) and the attachment point.

2. Camming clamping device according to claim 1 wherein the anchorage (9) is removable with respect to the body (3a) of the head (3) or destructible independently from the body (3a) of the head (3) to allow the head sub-assembly (1) and the rod sub-assembly (2) to be separated.

3. Camming clamping device according to one of claims 1 and 2 wherein the wire element (6) is subjected to a tensile stress in a longitudinal direction of the rod (5) and of the wire element (6), the rod (5) forming a stop opposing movement of the tube (7) towards the through hole (8).

4. Camming clamping device according to anyone of claims 1 to 3 wherein the wire element (6) has several loops (6a), the loops (6a) being passed through by the tube (7) and the anchorage (9).

5. Camming clamping device according to anyone of claims 1 to 4 wherein the tube (7) is divisible and is installed fixedly in the head (3) and wherein extraction of the tube (7) from the head (3) causes destruction of the tube (7).

6. Camming clamping device according to anyone of claims 1 to 5 wherein the anchorage (9) is a screw, and wherein at least one of the head (3) and the tube (7) has a thread receiving a thread of the screw to secure the anchorage (9) with the head (3).

7. Camming clamping device according to anyone of claims 1 to 5 wherein the anchorage (9) is an insert crimped with the head (3).

8. Camming clamping device according to anyone of claims 1 to 5 wherein the anchorage (9) is a rod fixed to the head (3) by means of an irremovable clip.

9. Camming clamping device according to anyone of claims 1 to 8 wherein the wire element (6) is a ring made from textile material.

10. Camming clamping device according to anyone of claims 1 to 9 wherein the wire element (6) is a ring folded to define at least two legs (6b) each comprising a top end, a bottom end and two strands; wherein the two strands join one another in the top end to form a loop (6a) attached to the head (3); wherein the bottom end of each leg (6b) is extended by a connecting portion (6c), the connecting portion (6c) connecting the legs (6b) to one another, the connecting portion (6c) delineating said through hole (8), the connecting portion (6c) comprising at least four strands of the wire element (6); wherein the loops (6a) are passed through by the tube (7).

11. Camming clamping device according to anyone of claims 1 to 9 wherein the at least one cam (4) is installed movable swivelling with respect to the body (3a) of the head (3) between an extended position and a retracted position, the anchorage (9) being fixed to the body (3a), and a spring (16) is fixed on the one hand to the body (3a) and on the other hand to the cam (4) to be able to bias the cam (4) away from the extended position.

12. Method for manufacturing a camming clamping device comprising the following steps: - providing a head sub-assembly (1) including a head (3) provided with a body (3a) and at least one cam (4) designed to wedge in a crevice, the at least one cam (4) being installed movable around at least one pivot shaft (13) attached to the body (3a), the body (3a) defining a cavity; - providing a rod sub-assembly (2) having a rod (5) and at least one wire element (6), the rod (5) being hollow and the at least one wire element (6) passing through the rod, the rod sub-assembly (2) delineating a through hole (8) designed to receive a connector to form an attachment point, the at least one wire element (6) delineating the through hole (§8), the wire element (6) defining at least one loop (6a); wherein a tube (7) passing through the at least one loop (6a) and the tube (7) is arranged to abut against a head end of the rod (5); - installing the at least one loop (6a), the tube (7) and head end in the cavity of the body (3a); - fixing an anchorage (9) to the body (3a), the anchorage (9) passing through the tube (7) and the at least one loop (6a) to attach the at least one loop (6a) to the head sub-assembly (1) and constitute a mechanical continuity between the head (3) and the attachment point.

13. Method for replacing a wire element (6) of a camming clamping device comprising the following steps: - providing a camming clamping device according to anyone of claims 1 to 11; - removing the anchorage (9) and separating the rod sub-assembly (2) from the head sub-assembly (1); - providing a new rod sub-assembly (2) having a rod (5) and at least one wire element (6), the rod (5) being hollow and the at least one wire element (6) passing through the rod, the rod sub-assembly (2) delineating a through hole (8) designed to receive a connector to form an attachment point, the at least one wire element (6) delineating the through hole (8), the wire element (6) defining at least one loop (6a) attached to the head sub-assembly (1) to constitute a mechanical continuity between the head (3) and the attachment point, a tube (7) passing through the at least one loop (6), the tube (7) being arranged to abut against a head end of the rod (5); - installing the loop (6a), the tube (7) and the head end in the cavity of the body (3a); - fixing the rod sub-assembly (2) with the head sub-assembly (1) by means of an anchorage (9) fixed to the head (3a) and passing through the tube (7) and the at least one loop (6a) to constitute the mechanical continuity between the head (3) and the attachment point.

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