Cam locking device and method for adjusting a wire element of a cam locking device

Abstract

A cam locking device comprises a head (1) with a cam (3) pivotally mounted about a pivot shaft (4) between retracted and extended positions. An annular end (2) is mechanically coupled to the head (1). A variable-length rod (8) connects the head (1) to an annular end (2) designed to receive a carabiner. A textile wire element (5) passes through the rod to connect the head (1) and the annular end (2). A trigger (7) is slidably mounted to selectively engage the retracted position of the cam (3). A rod length adjustment device (8) defines at least one distance between the head (1) and the annular end (2) that is greater than a threshold distance for extending the wire element (5) and compressing the rod (8) in the first direction (XX).

Description

technical field

[0001] The invention relates to a cam locking device, to a method of adjusting a wire element of a cam belaying 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 shape of crevice is suited to a specific cam configuration. Passive cams are often made of metal pieces with a specific shape. In one position, the cam can fit into a crack in the rock face, and in another position, it wedges between two opposite faces. It's then possible to easily place and remove the cam, provided it's positioned correctly within the hole. Conversely, in the event of a fall, the cam's position will be such that it will be wedged between two opposite faces of the hole.

[0004] In addition to passive camming devices, there are also active camming devices, also called camming devices or "friends." A camming device has a head with multiple cams. These cams are mounted to move freely around one or more pivoting shafts.

[0005] The cams move between a retracted and an extended position. In the retracted position, the head is less bulky than in the extended position. The cam head is inserted into a crack in its retracted position, and then the cams move towards the extended position, which presses the cams against the two opposite walls of the crack. The shape of the cams increases the force applied to the crack faces when the cam is pulled.

[0006] Typically, a camming device has, at one end, a head equipped with several rotating cams. The other end of the camming device is a ring end that is configured to receive a carabiner and serve as an anchor point for the climber.

[0007] The head is mechanically connected to the ring end by means of a cable, usually a steel cable. The two ends of the cable are crimped into the head of the camming device. The cable extends continuously between the two ends along the body and along the ring end to ensure mechanical continuity between the end fixed to the wall and the end intended to support the climber.

[0008] When the cable lacks the necessary transverse rigidity to provide good control in the placement of the camming device, it is common practice to use a rod extending from the head towards the annular end. The cable passes through the rod.

[0009] The cams are actuated by a trigger that slides along the rod. When the user pulls the trigger towards the ring end, the cams move to the retracted position. When the user releases the trigger, a spring returns the cams to the extended position.

[0010] Multiple cam shackle configurations are known which describe different configurations of cams, cables, rods or ring ends.

[0011] In the traditional design, the cable passes through a hollow rod extending from the head. The cable passes through the rod to ensure mechanical continuity. However, an alternative design exists in which one or more rigid metal rods connect the head to the ring end. A cable is no longer necessary. This alternative configuration is documented in the following documents: DE2824654, US4,565,342, US4,575,032, US4,645,149, GB2158540, US4,184,657, US4,513,641, GB2369068. This infinitely rigid rod configuration is not advantageous because it makes it difficult to install the cam in curved cracks.

[0012] Conventionally, the wire rope extending from one end to the other of the cam cleat is U-shaped, with its two upper ends crimped to the head, while the lower portion, which is usually the central portion, defines the annular end. US patents 2021 / 0001181 and 2020 / 034075 illustrate a cam cleat in which both ends of the wire rope are crimped into the head below the cams' axes of rotation. US patents 2020 / 034075 and 4,832,289 also disclose an embodiment in which only one end of the wire rope is crimped into the cleat head. The other end is crimped to form the annular end. US patents 7,278,618 and 6,679,466 disclose a wire rope in which each end is independently crimped on either side of the cams. A fitting defining a hole is crimped to each end and the hole in the fitting receives a shaft which secures the cable to the head.

[0013] Documents US5,860,629 and GB2380949 disclose a cable with one end crimped into the head of the jammer and the other end fitted with a ferrule forming the annular end. The ferrule is crimped onto the cable.

[0014] US patent 6,679,466 illustrates a cam cleat in which both ends of the wire rope each wrap around an anchor shaft in the head. The two ends form a loop of wire that is crimped to ensure mechanical continuity along the cam cleat.

[0015] For these configurations, the length of the jammer is defined by the length of the cable that is crimped.

[0016] To provide a lighter product, it is proposed to replace the steel cable with a Dyneema® webbing. Both ends of the webbing are secured in the head, and the webbing extends along the jammer to define the ring end. A technical solution is provided in US patent 10,143,892, which proposes forming a loop in the Dyneema webbing using a splicing step. The loop is used to secure the webbing end in the head of the jammer.

[0017] The lifespan of such a sling is significantly shorter than that of the previously used steel cable and much shorter than the lifespan of the head. The splicing process is lengthy and expensive. It also appears that the loop dimensions are less precisely controlled than with swaging, which can lead to length discrepancies in the camming devices and thus hinder the climber. This necessitates adjusting the stem length.

[0018] To ensure precise placement of the cams within a crack, it is important that the cam locking device possess a certain rigidity perpendicular to the axis connecting the head and the annular end. This necessitates a complex assembly of the various components relative to one another. According to the teachings of document US10,143,892, two springs are installed between the two portions of the rod before forming the loop to constrain the textile thread element. This complicates the loop formation by splicing. Object of the invention

[0019] One object of the invention is to provide a cam locking device which has good rigidity perpendicular to the direction connecting the head and the annular end while having a simpler design to possibly facilitate subsequent repair operations.

[0020] To address this issue, it is advisable to include a cam-locking device comprising: a head; at least one pivot shaft fixed to the head; at least one cam coupled to the head and mounted to pivot movably around the at least one pivot shaft, the at least one cam being movable between a retracted position and an extended position; a spring coupled to the at least one cam to urge the at least one cam towards the extended position; an annular end mechanically coupled to the head, the annular end being intended to receive a connecting element; a rod extending from the head to the annular end in a first direction, the rod having a first end fixed to the head and a second end totally or partially defining the annular end; at least one wire element continuously connecting the head and the annular end, the at least one wire element extending in the first direction and passing through the rod;an actuation system configured to selectively engage the retracted position of at least one cam, the actuation system having a trigger mounted to slide along the first direction.

[0021] The cam-locking device is notable in that the rod is a length-adjustable rod for applying a tensile force to the wire element from the head to the annular end, the rod has at least a proximal and a distal part, the distal part being mounted movable relative to the proximal part to adjust the length of the rod, and in that at least one blocker is configured to lock the rod at a desired length by blocking the position of the distal part relative to the proximal part.

[0022] According to one aspect of the invention, the jammer only blocks the distal part relative to the proximal part without jamming the wire element.

[0023] Advantageously, the wire element is a textile wire element.

[0024] In one particular configuration, the wire element is a textile wire element defining a sewn ring and the distal end has a tubular element, the wire element passing through the tubular element, with both ends of the ring being attached to the head.

[0025] In an advantageous development, the wire element is attached to the head by an anchor, the anchor being disposed at a distance from the cams along a direction of observation parallel to the pivot axis of at least one pivot shaft, the anchor being disposed between the annular end and at least one pivot shaft.

[0026] Preferably, one of the proximal and distal parts has a crenellated portion and the other of the proximal and distal parts has at least one tooth configured to fit into at least one crenellation of the crenellations of the crenellated portion, the crenellations of the crenellated portion being arranged consecutively along the first direction.

[0027] According to one embodiment, the proximal part extends from the head to a portion of the annular part, the blocker partially defining the through hole of the annular end.

[0028] In an advantageous development, the proximal part partially defines the through hole of the annular end.

[0029] Preferably, the rod is a telescopic rod.

[0030] In another advantageous development, the proximal part defines a plurality of adjustment stops, the distal part being wedged against a stop of the plurality of adjustment stops.

[0031] Preferably, in the rest position, the trigger faces said stop of the plurality of adjustment stops.

[0032] The invention also relates to a method of installing a wired element that is easier to adjust than in prior art configurations.

[0033] This result is achieved by means of a method for adjusting a wire element of a cam cleat comprising the following steps: provide a cam locking device according to any of the preceding configurations; extend the rod to apply a tensile force and stretch the wire element and apply a compressive force on the rod; fix the length of the rod that stretches the wire element. Brief description of the drawings

[0034] 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 first embodiment of a cam-locking device; the figure 2 schematically illustrates a perspective view of a first embodiment of a cam-locking device with an exploded view of the annular end; the figure 3 schematically illustrates a cross-sectional view of a first embodiment of a cam-locking device, in the non-extended position; the figure 4 schematically illustrates a cross-sectional view of a first embodiment of a cam-locking device, in the extended position; the figure 5schematically illustrates a perspective view of a second embodiment of a cam-locking device; the figure 6 schematically illustrates a perspective view of a second embodiment of a cam-locking device with an exploded view of the annular end; the figure 7 schematically illustrates a cross-sectional view of a second embodiment of a cam-locking device, in the non-extended position; the figure 8 schematically illustrates a cross-sectional view of a second embodiment of a cam-locking device, in the extended position; the figure 9 schematically illustrates a perspective view of a third embodiment of a cam-locking device with a representation of the equivalent conformation of the wire element; the Figure 10 schematically illustrates a cross-sectional view of a third embodiment of a cam-locking device, in a non-extended position; the figure 11schematically illustrates a cross-sectional and exploded view of a third embodiment of a cam-locking device; the figure 12 schematically illustrates a perspective view of a fourth embodiment of a cam-locking device with the equivalent representation of the wire element conformation; the figure 13 schematically illustrates a cross-sectional view of a fourth embodiment of a cam locking device, in the extended position. Description of the implementation methods

[0035] THE figures 1 to 13 illustrate different embodiments of a cam locking device, also known as a "cam locker". The cam locking device is an active locking device.

[0036] The cam locking device has a first end which is a head 1 and a second opposite end which is an annular end 2. Conventionally, the annular end 2 is in the form of a ring which defines a through hole configured to receive a carabiner.

[0037] The annular end 2 is capable of supporting the weight of a user. The head 1 has at least one cam 3 and preferably several cams 3 which are mounted to pivotally move between an extended and a retracted position. Preferably, several cams 3 are mounted to move independently of each other.

[0038] The cam(s) 3 are mounted movable around at least one pivot shaft 4. The pivot shaft 4 is fixed to the head 1, more precisely the pivot shaft 4 is fixed to a body 1a of the head 1. The body 1a can be formed by one or more parts.

[0039] The cam-locking device has a wire element 5 that mechanically connects the head 1 to the annular end 2. The wire element 5 mechanically couples the cams 3 to the annular end 2 so that a user attached to the annular end 2 is held by means of the cams 3, which are wedged, for example, in a crack. The wire element 5 is the element that ensures mechanical continuity between the head 1 and the annular end 2. The cam(s) 3 are mechanically coupled to the annular end 2. The wire element 5 extends along a first direction XX that connects the head 1 to the annular end 2 in such a way as to achieve mechanical holding along this first direction XX. The wire element 5 is attached to the head 1 and extends continuously from the head 1 to reach the annular end 2 to achieve mechanical continuity along the locking device.

[0040] The pivot shaft 4 extends mainly along a second direction YY which is perpendicular or substantially perpendicular to the first direction XX. The cam(s) 3 are mounted to rotate about the second direction YY.

[0041] Preferably, the head 1 has at least one anchor point 6, for example an anchor shaft. Advantageously, the wire element 5 is fixed to the anchor point 6 so as to mechanically couple the wire element 5 and the head 1.

[0042] Preferably, the wire element 5 defines at least one loop through which the anchor 6 passes in order to transfer the load to the annular end 2 when the cam locking device is subjected to a tensile force along the first longitudinal direction XX. Preferably, the wire element 5 is a textile material. Advantageously, the textile material is a polyethylene with a very high molar mass, for example, a material marketed under the names Dyneema® or Spectra®.

[0043] In a particular embodiment illustrated in figures 1 to 13 The wire element 5 is in the form of a ring. It is advantageous to obtain the ring by joining two terminations of the wire element 5. The two terminations can be fixed to each other by a 5d stitch as illustrated in the diagram. figures 2 , 3 , 4 , 6 , 7, 8 , 9for a textile wire element. Sewing is a well-established process, which facilitates the creation of a ring with controlled mechanical strength. Using a sewing step allows for the formation of a ring that is less expensive and has a more precise dimension than its equivalent obtained by splicing. It is advantageous for the ring to be free of crimping and splicing. The wire element 5 can be a strap or a rope.

[0044] The locking device includes an actuation system coupled to at least one cam 3. The actuation system is configured to selectively engage the retracted position of at least one cam 3. The actuation system has a trigger 7 mounted to slide along the first direction XX connecting the head 1 and the annular end 2.

[0045] The trigger 7 is mounted to move relative to the head 1 and is coupled to at least one cam 3. The trigger 7 is coupled to at least one cam 3 such that the movement of the trigger 7 away from the head 1 causes the at least one cam 3 to move towards the retracted position, i.e., out of the extended position. Preferably, the trigger 7 is coupled to all the cams 3 so that the movement of the trigger 7 away from the head 1 causes the cams 3 to move towards the retracted position. Outside the first trigger position, at least one cam 3 is out of the extended position.

[0046] Preferably, when at least one cam 3 is in a retracted position, at least one cam 3 does not prevent a movement of the trigger 7 towards the head 1.

[0047] In a preferred embodiment, the trigger 7 is slidably mounted along the wire element 5 between the head 1 and the annular end 2. The trigger 7 can be coupled to the cam 3 or to each cam 3 by an additional wire element 10. The additional wire element 10 can be a metal cable, a textile element, or a wire element made of a synthetic material, for example, plastic. The additional wire element 10 mechanically couples the cam 3 to the trigger 7 and allows a movement of the trigger 7 towards the second trigger position, i.e., a movement towards the annular end 2, to be translated into a movement of the cam 3 towards the retracted position. The movement of at least one cam 3 from the retracted position to the extended position results in a movement of the trigger 7 out of the second trigger position.

[0048] The cam locking device has a spring 11 configured to actuate at least one cam 3 towards the extended position. The spring 11 can be made 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 obstruction or obstruction, the spring 11 places the cam(s) 3 in the extended position. The force applied to the trigger 7 to move it away from the head 1 corresponds to a force applied to the spring 11 to move the cam(s) 3 out of the extended position. In one embodiment, the spring 11 is fixed on one side to the cam 3 and on the other side to the head 1. In another embodiment, the spring 11 is fixed on one side to a first cam 3 and on the other side to a second cam 3 mounted on a different pivot shaft 4 than the first cam 3.The locking device may include as many springs 11 as cams 3 or as many springs 11 as pairs of cams 3.

[0049] When the wire element 5 is a textile material, it is difficult to achieve sufficient rigidity perpendicular to the first direction XX using the wire element 5 alone; therefore, rigidity is provided by an additional element such as a rod. The same applies when the wire element 5 is a thin metal cable. To increase the rigidity perpendicular to the first direction XX, the cam locking device includes at least one rod 8 extending along the first direction XX from the head 1 to the annular end 2. At least one rod 8 is fixed at one end to the head 1 and partially or completely defines the annular end 2. Preferably, one end of the rod 8 can be butted against the head 1. The force applied by the wire element forces one end of the rod 8 against the head 1.

[0050] In the embodiments illustrated in figures 1 to 13, the cam locking device comprises a single rod 8 which extends longitudinally along the first direction XX.

[0051] The rod 8 is more rigid than the wire element 5 perpendicular to the XX direction, which allows the cam locking device to be held by means of the rod 8 and the locking device to be positioned precisely in a crack compared to an equivalent device without the rod 8. It is advantageous for the trigger 7 to be mounted to slide along the rod 8 and for the rod 8 to separate the wire element 5 and the trigger 7. To protect the wire element, it is advantageous for the wire element 5 to pass through the rod 8.

[0052] To ensure good rigidity perpendicular to the first direction XX, it is advantageous to apply a tensile force to the wire element from its attachment point to the head to its annular end. To apply a tensile force to the wire element 5, the rod 8 is used, which then receives a compressive force along the first direction XX applied by the wire element.

[0053] The manufacturing of the wire element results in a variation around a target length. The same is true for the manufacturing of the rod. In order to apply sufficient force to the wire element, it is preferable to adjust the lengths of the wire element and the rod. It is therefore particularly advantageous to use a rod whose length is adjustable along the first direction XX so as to apply tension to the wire element 5 along the first direction XX. While document US10,143,892 proposes using springs that will be compressed when the wire element is attached to the head, it is proposed to form a rod 8 in two parts with a locking mechanism that fixes the length of the rod 8.

[0054] In a particular embodiment, the rod 8 has a variable length. Using a variable length allows the length of the rod 8 to be adjusted to the effective length of the wire element 5 between the head 1 and the annular end 2. To obtain a rod 8 with a variable length, it is advantageous to have the rod 8 made in at least two parts, with a first part 8a mounted movably relative to the second part 8b along the first direction XX. By moving the first part 8a relative to the second part 8b, the length of the rod 8 can be adjusted. It is possible to apply a tensile force to the wire element 5 along the first direction XX. This allows the rod 8 to be subjected to compression by means of the wire element 5, thus increasing the stiffness of the rod 8. The length is measured along the first direction XX.

[0055] Depending on the embodiment, the length of the rod 8 can be adjusted continuously or incrementally. Once the length is defined, a locking device 12 secures the position of the second part 8b relative to the first part 8a. Since the wire element 5 is more rigid than the rod 8 along the first direction XX, it will resist the increase in the length of the rod 8, which will then be subjected to compressive stress. This compression of the rod 8 will result in a more rigid rod 8 perpendicular to the first direction YY, thus improving the precise placement of the locking device in the crack.

[0056] In the first locking position, the length of the rod 8 can be adjusted, preventing excessive or undue stress on the wire element 5. This facilitates the attachment of the wire element 5 to the head 1. In the second locking position, the length of the rod 8 is fixed. The length of the rod 8 determines the level of force applied to the wire element 5.

[0057] In other words, the cam locking device includes a rod length adjustment device 8 configured to separate the head 1 and the annular end 2 beyond at least a threshold distance and apply a tensile force on the wire element 5 along the first direction XX.

[0058] The rod 8 has a proximal portion 8a that abuts against the head 1 or is fixed to the head. The rod 8 also has a distal portion 8b forming all or part of the annular end 2 and separated from the head 1 by the proximal portion 8a. The distal portion 8b is mounted to move relative to the proximal portion 8a to vary the length of the rod 8 and apply the tensile force to the wire element 5 along the first direction XX. This solution is simple to implement and allows the length of the rod 8 to be adapted to the length of the wire element 5.

[0059] It is advantageous that the proximal part 8 and the distal part 8b comprise or are made of a tube through which the wire element 5 passes. The distal part 8b protects the wire element 5 against wear in all or part of the annular end 2.

[0060] Advantageously, the proximal portion 8a defines at least one cavity for receiving one end of the distal portion 8b. When the blocker 12 is in the first blocker position, the end of the distal portion 8b is fixed in the cavity. When the blocker 12 is in the second blocker position, the end of the distal portion 8b can slide within the cavity.

[0061] Preferably illustrated in figures 1 to 13The tubular portion of the distal end 8b of the rod 8 is capable of elastic deformation perpendicular to the first direction XX in order to better adapt its shape to the shape of the wire element 5 under tensile stress. Preferably, the wire element 5 is in continuous contact with the tubular portion of the distal end 8b so that the deformations applied to the annular end 2 are absorbed by the wire element 5. By deforming, the tubular portion of the distal end 8b applies a tensile stress to the wire element 5 and a compressive stress to the proximal end 8a. The deformation of the distal end 8b increases the stiffness perpendicular to the first direction XX.

[0062] Advantageously, one of the proximal part 8a and the distal part 8b has a serrated portion 8c, and the other of the proximal part 8a and the distal part 8b has at least one tooth configured to fit into at least one of the slots in the serrated portion 8c. The slots are arranged consecutively along the first direction XX. Using a plurality of slots that cooperate with at least one tooth, and preferably with a plurality of teeth, allows for the definition of several distinct lengths of the stem 8. It is then easier to adapt the length of the stem 8 to the length of the wire element 5 and to maintain this length. Such an embodiment is illustrated in figures 7 and 8 and can be applied to other embodiments.

[0063] In the embodiments illustrated in figures 1 to 13The cam locking device includes a blocker 12 which is configured to block the position of the distal portion 8b relative to the proximal portion 8a. The blocker 12 is mounted removably relative to the rod 8. The blocker 12 may include a screw 9 or any other means of fastening to secure the blocker 12 to the rod 8.

[0064] In the first locking position, the blocker 12 reduces the available sliding area between the first part 8a and the second part 8b. The position of the distal part 8b is fixed relative to the proximal part 8a. In the second sliding position, the blocker 12 moves away, increasing the available area and allowing adjustment of the rod length 8. figures 3 and 4show a blocker 12, one end of which is in the form of a wedge; the depth of insertion of the blocker 12 into the rod 8 defines the value of narrowing of the cavity intended to receive the end of the distal part 8b.

[0065] It is particularly advantageous to install the blocker 12 in the portion of the rod 8 that defines the annular end 2 rather than in the tubular section that connects the head to the annular end. This provides more space to avoid the formation of a preferred friction zone with the wire element 5. It also allows the tubular portion of the distal part 8b to better adapt its shape to the applied stresses. Furthermore, it facilitates the assembly of the rod 8.

[0066] For example, in the first blocker position, the blocker 12 clamps at least one or both terminations of the distal part 8b against the proximal part 8a as illustrated in figures 3, 4 , 7, 8 , 10 And 13 . When the blocker 12 jams only one termination of the distal part 8b, the other termination is abutted against the proximal part 8a.

[0067] In the embodiment illustrated in figures 1 to 4The proximal portion 8a defines two cavities designed to receive the two ends of the distal portion 8b. In a first locking position, the locking mechanism 12 secures the position of the distal portion 8b relative to the proximal portion 8a. In a second locking position, the locking mechanism 12 allows the distal portion 8b to move relative to the proximal portion 8a along the first direction XX. This arrangement facilitates the insertion of the tubular portion into the cavities and then the application of a tensile force to the tubular portion and the wire element to compress the remaining section of the rod 8.

[0068] THE figures 1 to 4illustrate an embodiment where the blocker 12 is fixed in a hole in the proximal part and reduces the section available for the distal part 8b. The terminations of the distal part 8b deform and wedge against the proximal part 8a, which fixes the position of the distal part 8b relative to the proximal part 8a.

[0069] THE figures 5 to 8 illustrate an embodiment where the blocker 12 defines at least one tooth or a serrated portion 8c and the distal portion defines a serrated portion or at least one tooth. Once the blocker 12 is fixed to the proximal portion 8a, the serrated portion and the at least one tooth fix the position of the distal portion 8b. The blocker 12 defines a wall of the cavity intended to receive the end of the distal portion 8b.

[0070] THE figures 9 to 11illustrate another embodiment with a proximal portion 8a, which is a telescopic proximal portion. The blocker 12 attaches to the proximal portion 8a and clamps the distal portion 8b to fix its position. The two-part assembly of the proximal portion 8a facilitates the mounting of the rod 8. The proximal portion 8a has a first portion 8d and a second portion 8e, which are movable relative to the first portion 8d along the first direction XX. In the position illustrated in the figure 9 The proximal part 8a is in an extended position. In the position illustrated in the Figure 10The proximal portion 8a is in a retracted position. The configuration of the proximal portion 8a between the extended and retracted positions is independent of the position of at least one cam 3 and the position of the trigger 7. The proximal portion 8a may have its own locking mechanism to fix the position of the second portion 8e relative to the position of the first portion 8d. For example, the first portion 8d and the second portion 8e define a set of grooves and teeth that only allow for an extension of the length of the rod 8.

[0071] Preferably, once the proximal portion 8a is in the extended position, it is not possible to return it to the retracted position, or the force required to reach the retracted position is greater than the force applied between the wire element 5 and the rod 8 to compress the rod 8. Using a proximal portion 8a in at least two sections, preferably with a telescopic assembly, facilitates the assembly of the rod 8 and the tensioning of the wire element 5. Preferably, in the retracted position, the proximal portion 8a and the distal portion 8b are unable to stretch the wire element 5. The locking device 12 allows for more precise adjustment of the rod 8's length.

[0072] In yet another embodiment, a particular configuration of which is illustrated in Figures 12 And 13The distal part 8a and the proximal part 8b are mounted movably relative to each other to define several stable positions of the distal part 8b relative to the proximal part 8a. In the particular configuration illustrated, the distal part 8a and the proximal part 8b define a groove and tongue device which allows the length of the rod 8 to be defined.

[0073] The distal portion 8b is preferably made in two parts, with a first portion 8d and a second portion 8e. The two portions are not configured to adjust the rod length by relative displacement between the first portion 8d and the second portion 8e. The stopper 12 reduces the cross-section available for the passage of the second portion 8e, which has the effect of wedging the second portion 8e relative to the first portion 8d. The wedging of the second portion 8e pulls on the wire element 5. When the stopper 12 is removed, the second portion 8e provides sufficient space for the wire element, allowing it to deform and reduce the tensile stress. The stopper 12 is installed after stretching the wire element to create the space for it.

[0074] In the illustrated embodiments, rod 8 is represented as a telescopic rod 8. However, other embodiments are possible.

[0075] The use of a rod 8 whose length is adjustable is particularly advantageous for controlling the rigidity of the rod 8 perpendicular to the first direction XX by applying a constraint by means of the wire element 5. Such an embodiment facilitates factory manufacturing.

[0076] This configuration is particularly advantageous for manufacturing the cam locking device. It is also particularly advantageous for replacing the wire element of the cam locking device and / or the rod.

[0077] For the manufacture of a cam locking device, a cam locking device is provided according to any one of the preceding configurations. The rod 8 is extended to increase the distance between the head 1 and the annular end, which has the effect of applying a tensile force to the wire element 5 and a compressive force to the rod 8. The length of the rod 8 is fixed at the predetermined length. The length of the rod is locked by means of the locking device 12.

[0078] Such a configuration is particularly advantageous during a repair operation of the cam locking device. For example, if the rod 8 is damaged and needs to be replaced, a variation in length between the original rod and the new rod is easily compensated for by adjusting the length of the rod to the length of the wire element.

[0079] This configuration is particularly advantageous when replacing the wire element 5, which ensures mechanical continuity between the head and the annular end. Variations in the head's dimensions, the wire element's length, and the length of the rod 8 mean that a locking device is almost never disassembled to replace the wire element 5.

[0080] Providing a variable length rod makes it possible to compensate for manufacturing variations and thus to provide a new wire element 5 and preferably a replacement kit including a new wire element and a new rod.

[0081] A cam locking device is provided comprising a head 1 connected to an annular end 2 by a wire element 5 and a rod 8. As stated above, the head 1 is provided with at least one cam 3, at least one pivot shaft 4, at least one spring 11 and a trigger 7 mechanically linked to at least one cam 3.

[0082] The rod 8 and the wire element 5 are removed. The new wire element 5 and the rod 8 are attached together to the head 1, with the wire element 5 passing through the rod. The rod 8 is extended to increase the distance between the head 1 and the annular end 2, which applies a tensile force to the wire element 5 and a compressive force to the rod 8. The length of the rod 8 is fixed at the predetermined length, and the desired length is set using the locking mechanism 12. Care must be taken to replace the rod 8 in the corresponding hole of the trigger 7.

[0083] To facilitate attaching the wire element to the head, it is advantageous for the rod to be in the retracted position or in a compact position. Then, the length of rod 8 is extended to compress it.

[0084] Replacing the wired element can be done with limited equipment, which facilitates the replacement operation by dedicated operators or even by the user.

[0085] It is still possible to replace the rod 8 and the wire element 5 to adapt the length of the locking device to a specific need. A trigger extender 7 can then be considered if the length of the rod 8 and the length of the wire element 5 are significantly increased.

[0086] THE figures 1 to 13They illustrate a rod 8 whose proximal end 8a is inserted into the head 1, more preferably into the body 1a of the head, such that the proximal end 8a abuts against one of the components of the head 1. This embodiment is advantageous because it allows for easy installation and removal of the proximal end. When the rod 8 is not under compression, the rod 8 can move along the first direction XX. Alternatively, the proximal end 8a can be fixed directly to the head 1.

[0087] In the illustrated embodiments, the cam locking device has four cams 3. It is possible to use more or fewer cams 3. The configurations shown for installing the wire element 5 are applicable to locking devices that have one, two, three, four, or more cams 3. The number of cams 3 can be even or odd. The cams 3 are preferably made of metallic material, for example, aluminum alloy or steel.

[0088] The rod 8 is preferably made of polymer material so that it can be flexible in one or more directions perpendicular to the first direction XX.

[0089] The embodiments described above are particularly advantageous for a textile wire element, which has a shorter lifespan than its metallic equivalent. Furthermore, the wire element ring 5 is manufactured in a factory using controlled sewing processes, ensuring good mechanical strength of the wire element 5.

[0090] Preferably, the wire element 5 is in the form of a ring; it is advantageous to shape the ring into a "U". The figures illustrate a ring shaped, for example, folded, into a U with two legs 5a, each ending in a loop 5b. There is also a connecting portion 5c that links the two legs 5a. The connecting portion 5c is preferably a central portion. Preferably, the seam 5d is located in the central portion to minimize bulk in or near the head 1. The two legs 5a of the U-shaped wire element pass through the rod 8 to emerge in the head 1 opposite the anchor 6 in a direction perpendicular to the XX direction, here in the YY direction, but another configuration is possible.

[0091] Preferably, each of the legs 5a is terminated by a loop 5b which is crossed by an anchoring tree of the head 1.

[0092] Once installed in the cam-locking device, the wire element 5 has a first loop 5b attached to the head 1. The first leg 5a extends from the head 1 to the annular end 2. The wire element 5 extends along the annular end 2 and returns to the head 1 by means of the second leg 5a. Applying a tensile force between the head 1 and the annular end 2 puts the wire element 5 under tension. In the illustrated embodiment, there are four strands of the wire element connecting the head 1 to the annular end 2. More or fewer strands of wire elements are possible.

[0093] The connecting portion 5c extends along the annular end 2 while the two legs 5a each extend towards the head 1.

[0094] THE figures 1 to 13 These illustrate embodiments in which the two loops 5b at the two ends of the folded U-shaped ring are traversed by an anchoring shaft 6. For example, the anchoring shaft 6 is fixed to the body 1a of the head 1 by screwing, crimping, or riveting. Depending on the embodiment, the anchoring shaft 6 is mounted either removable or non-removable from the rest of the head 1. The two ends of the wire element 5 are inserted into the head 1. The anchoring shaft 6 passes through the two loops 5b and secures the wire element to the head 1 at both points. The anchoring shaft 6 is fixed at both ends to the body 1a.

[0095] It is particularly advantageous to have a removable anchor shaft 6 mounted relative to the head 1 so that the wire element 5 is easily replaceable. Removing the anchor shaft 6 eliminates the connection between the wire element 5 and the head 1, thus allowing for replacement of the wire element 5.

[0096] It is advantageous to have a head 1 which defines a blind hole to prevent the passage of the wire element 5 through the head in the first direction XX.

[0097] In an alternative embodiment, the anchoring shaft 6 may not be removable. By preventing the anchoring shaft 6 from being removed, safety is increased by eliminating a potential cause of incorrect reassembly. The two legs 5a enter the body 1a and pass around the anchoring shaft 6. The two legs 5a then extend from the head 1 towards the annular end 2, and the loops 5b at the ends of the two legs 5a are passed through the annular end 2. Pulling on the wire element 5 forms a lark's head knot around the anchoring shaft 6, thus securing the wire element 1 to the head 1. This embodiment may be difficult to implement if the space within the head 1 is limited, preventing the wire element 5 from sliding and passing around the anchoring shaft 6.

[0098] Anchor 6 is destructible relative to the head. Destroying anchor 6 removes the mechanical connection between the wire element and the head. This allows one wire element to be replaced with another.

[0099] To facilitate replacement of the wire element and / or the rod, it is advantageous to install the anchor below the space occupied by at least one pivot shaft and at least one cam. In other words, the anchor is not positioned opposite a pivot shaft and opposite at least one cam in a direction of observation that is parallel to the pivot axis of at least one pivot shaft.

[0100] The anchor is positioned between at least one cam and the annular end. This arrangement allows easier access to the anchor, enabling separation between the head 1 and the wire element without having to disassemble one or more cams, or one or more pivot shafts.

Claims

1. Camming clamping device comprising: - a head (1); - at least one pivot shaft (4) fixed to the head (1); - at least one cam (3) coupled to the head (1) and installed movable swivelling around the at least one pivot shaft (4), the at least one cam (3) being movable between a retracted position and an extended position; - a spring (11) coupled to the at least one cam (3) to bias the at least one cam (3) to the extended position; - an annular end (2) mechanically coupled to the head (1), the annular end (2) being designed to receive a connecting part; - a rod (8) extending from the head (1) to the annular end (2) in a first direction (XX), the rod (8) having a first end fixed to the head (1) and a second end totally or partially defining the annular end (2); - at least one wire element (5) continuously connecting the head (1) and the annular end (2), the at least one wire element (5) extending in the first direction (XX) and passing through the rod (8); - an actuating system configured to selectively engage the retracted position of the at least one cam (3), the actuating system having a trigger (7) installed slidingly along the first direction (XX); wherein the rod (8) is an adjustable length rod to apply a tractive force to the wire element (5) from the head (1) to the annular end (2), the rod (8) having at least a proximal part (8a) and a distal part (8b), the distal part (8b) being arranged movable with respect to the proximal part (8a) to adjust the length of the rod (8), camming clamping device characterised in that in that at least one clamp (12) is configured to block the rod (8) at a required length by blocking the position of the distal part (8b) with respect to the proximal part (8a).

2. Camming clamping device according to claim 1 wherein the at least one clamp (12) only blocks the distal part (8b) with respect to the proximal part (8a) without jamming the wire element (5).

3. Camming clamping device according to claim 2 wherein the at least one wire element (5) is a textile wire element.

4. Camming clamping device according to claim 3 wherein the at least one wire element (5) is a textile wire element defining a stitched ring and the distal end (8b) comprises a tubular element, the at least one wire element (5) passing through the tubular element, two ends of the ring being fixed to the head (1).

5. Camming clamping device according to one of claims 3 and 4 wherein the at least one wire element (5) is attached to the head (1) by an anchoring part, the anchoring part being arranged at a distance from the cams in a direction of observation parallel to the swivelling axis of the at least one pivot shaft, the anchoring part being arranged between the annular end (2) and the at least one pivot shaft (4).

6. Camming clamping device according to any one of claims 1 to 5 wherein one of the proximal part (8a) or the distal part (8b) has a crenellated part (8c) and the other of the proximal part (8a) and distal part (8b) has at least one tooth configured to insert in at least one slot of the slots of the crenellated part (8c), the slots of the crenellated part (8c) being arranged consecutively along the first direction (XX).

7. Camming clamping device according to any one of claims 2 to 6 wherein the proximal part (8a) extends from the head (1) up to a portion of the annular end (2), the at least one clamp (12) partially defining the through hole of the annular end (2)8. Camming clamping device according to claim 7 wherein the proximal part (8a) partially defines the through hole of the annular end (2).

9. Camming clamping device according to any one of claims 1 to 8 wherein the rod (8) is a telescopic rod.

10. Camming clamping device according to claim 9 wherein the proximal part (8a) defines a plurality of adjustment stops, the distal part (8b) being wedged against one stop of the plurality of adjustment stops.

11. Camming clamping device according to claim 10 wherein, in a rest position, the trigger (7) is facing said one stop of the plurality of adjustment stops.

12. Method for adjusting a wire element (5) of a camming clamping device comprising the following steps: - providing a camming clamping device according to any one of claims 1 to 11; - lengthening the rod (8) to apply a tractive force and stretch the wire element (5) and apply a compressive stress on the rod (8); - fixing the length of the rod (8) stretching the wire element (5).

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