BLOCKING DEVICE WITH MOVABLE CAM AND METHOD FOR MANUFACTURING A BLOCKING DEVICE WITH MOVABLE CAM

Description

Domaine technique

[0001] The invention relates to a movable cam locking device and a method for manufacturing a movable cam locking device. Technique antérieure

[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 fixed 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 spatial position, the cam can fit into a crack in the rock face, and in a second spatial position, it wedges between two opposing faces. It's then possible to easily place and remove the cam, or to jam it, provided it's positioned correctly within the hole.

[0004] In addition to passive rope clutches, there are also active rope clutches, also called cam clutches or cam-locking devices. A cam clutch has a head with multiple cams. These cams are mounted to rotate around one or more 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 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.

[0008] The movable cam(s) are pivotally mounted and connected to the trigger by one or more wires, typically steel cables of the "piano wire" type. Conventionally, each end of the steel cable is attached to a movable cam, and the cable passes through the trigger to form the mechanical connection between the cams and the trigger. This connection can be achieved by crimping or riveting. Because the steel cable has a small cross-section, it deteriorates rapidly and often breaks, requiring repair at an authorized service center. Furthermore, securing the cable to the rotating cam becomes increasingly difficult as the cable cross-section decreases and the rotating cam cross-section decreases.

[0009] In an alternative embodiment, the steel cable is replaced by a textile cable. Each end of the cable is attached to a cam. Each cam has a hole through which the textile cable passes. The end of the textile cable is secured to the cam by gluing and / or by means of a knot with a cross-section larger than the hole. Adhesive or knot fastening becomes increasingly difficult as the size of the cam decreases because the thickness of the knot causes the textile cable to extend beyond the cam and / or makes it difficult to control the cable length.

[0010] During the manufacture of the cam locking device, there is some variation in the length of the wire element before it is attached to the trigger and cams, and there is also some variation in the actual length of the wire element after attachment to the cams. These variations mean that the behavior of the cam locking devices can vary or must be compensated for by springs designed to separate the trigger and cams to tension the wire element. A cam locking device is known from DE 3545306 C1. Objet de l'invention

[0011] One object of the invention is to provide a cam locking device in which the mechanical link between the trigger and the moving cam is better controlled and is preferably easier to replace.

[0012] According to one aspect of the invention, the cam locking device according to claim 1 comprises: a head; at least one cam mounted movable to pivot about at least one pivot shaft, the at least one cam being movable between a retracted position and an extended position, the at least one pivot shaft being fixed to the head, the at least one cam defining at least a first hole and a second hole which are through holes between a first side and a second side of the at least one cam; a spring functionally 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; a rod extending from the head to the annular end;a movable trigger mounted between a first trigger position and a second trigger position, a textile wire element having a first end fixedly mounted with at least one cam, the textile wire element connecting the trigger to at least one cam, the textile wire element functionally linking the trigger to at least one cam, when the trigger is in the second trigger position the at least one cam is in the retracted position.

[0013] The cam locking device is notable in that the textile wire element passes through the first hole and the second hole to introduce friction between the textile wire element and at least one cam and in that a terminal portion of the textile wire element passes through a third hole connecting the first side and the second side and / or is wedged in at least one groove formed in the first side or the second side, the terminal portion of the textile wire element being disposed posterior to the second hole in a longitudinal direction of the textile wire element from the trigger.

[0014] Preferably, the cam defines the third hole. A downstream strand of the textile wire element is clamped against one face of at least one cam by an upstream strand of the textile wire element, the downstream strand being positioned further from the trigger than the upstream strand along the longitudinal direction of the textile wire element.

[0015] Advantageously, at least one cam defines at least one groove. One end of the textile wire element is embedded in at least one groove.

[0016] In a particular configuration, the groove connects the first hole and the third hole.

[0017] In an advantageous development, the downstream strand is wedged into the groove.

[0018] Preferably, the textile wire element passes successively through the first hole and the second hole along its longitudinal direction from the trigger. The first hole defines a first end with the first side and a second end with the second side. The textile wire element enters the first hole from the second side, the second end forming a second bearing zone for the textile wire element. This second bearing zone has an edge that is less sharp than either the first end of the first hole and / or the edge of the second hole with either the first or second side.

[0019] In one embodiment, a side wall of the first hole connects one face of the second side to at least one cam. The bearing area of ​​the second end is an arc of a circle having a radius of curvature at least equal to half the thickness of the textile wire element.

[0020] In an advantageous development, the side wall of the first hole defines a sharp edge with the second face of the at least one cam and / or a side wall of the second hole defines with the first face or the second face of the at least one cam.

[0021] Preferably, the first hole and the second hole open into a thinned area of ​​the at least one cam, the thinned area representing a thinning at least equal to the thickness of one strand of the textile wire element.

[0022] In another advantageous development, the cross-section of the textile wire element is less than the cross-section of the first hole and the second hole from one end to the other of the textile wire element along the longitudinal direction of the textile wire element.

[0023] Preferably, the textile wire element is only fixed to at least one cam by wedging in the groove and / or by friction at the ends of the first hole, the second hole and the third hole.

[0024] In an advantageous configuration, at least one cam has a first cam and a second cam. The textile wire element has a first end fixed to a first cam and a second opposite end fixed to the second cam.

[0025] The invention also relates to a method for manufacturing a cam-locking device for a wire support element that is easy to implement and in particular that allows easy attachment of a textile wire element with a cam while ensuring good mechanical attachment.

[0026] This result is to be achieved by means of a manufacturing process according to claim 14, comprising the following steps: provide a textile wire element and a cam locking device comprising: a head; at least one cam mounted movable to pivot about at least one pivot shaft, the at least one cam being movable between a retracted position and an extended position, the at least one pivot shaft being fixed to the head, the at least one cam defining at least a first hole and a second hole; a spring functionally 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; a rod extending from the head to the annular end; a trigger functionally linked to the at least one cam, the trigger being mounted movable between a first trigger position and a second trigger position, and in the second trigger position the at least one cam is in the retracted position.

[0027] The manufacturing process is remarkable in that at least one cam has at least one third hole and / or at least one groove; in which the wire element passes through the first hole, the second hole and at least one third hole to form consecutive friction zones between the textile wire element and at least one cam along a longitudinal direction of the textile wire element; and / or in which at least one groove has a width less than or equal to a width of the textile wire element, the textile wire element being deformably embedded in at least one groove. Description sommaire des dessins

[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 a side view of a cam-locking device; the figure 3 schematically illustrates a front view of a cam-locking device; the figure 4 schematically illustrates a perspective view of a moving cam and a textile wire element; the figure 5a schematically illustrates a view of the first side of a movable cam with a strand of textile thread; the figure 5b schematically illustrates a cross-sectional view along AA of the moving cam; the figure 5c schematically illustrates a view of the second side of a moving cam; the figure 6a schematically illustrates a view of the first side of a movable cam with a strand of textile thread; the figure 6b schematically illustrates a cross-sectional view along AA of the moving cam with a strand of textile yarn repeatedly passing through the moving cam; the figure 6c schematically illustrates a view of the second side of a movable cam with a strand of textile thread; the figure 7 schematically illustrates a perspective view of another cam-locking device; the figure 8 schematically illustrates a side view of another cam-locking device; the figure 9 schematically illustrates a front view of another cam-locking device; the figure 10 schematically illustrates a perspective view of a movable cam and a textile wire element of another cam-locking device; the figure 11a schematically illustrates a view of the first side of a moving cam of another cam-locking device; the figure 11b schematically illustrates a cross-sectional view along AA of the moving cam of another cam-locking device; the figure 11c schematically illustrates a view of the second side of a moving cam of another cam-locking device; the figure 12a schematically illustrates a view of the first side of a movable cam with a strand of textile thread element from another cam-locking device; the figure 12b schematically illustrates a cross-sectional view along AA of the moving cam with a strand of textile thread repeatedly passing through the moving cam of another cam-locking device; the figure 12c schematically illustrates a view of the second side of a movable cam with a strand of textile wire element of another cam locking device. Description des modes de réalisation

[0029] THE figures 1 à 12c illustrate different embodiments of a cam locking device, also known as a "cam locker". The cam locking device is an active locking device.

[0030] The cam locking device has a first end fitted with a head 1 and a second, opposite end which is an annular end 2. The head 1 is coupled to at least one cam 3, and preferably to several cams 3, which are mounted to pivotally move between an extended and a retracted position. The overall dimensions in the extended position are greater than those in the retracted position. The cam(s) 3 are mounted to pivotally move around at least one pivot shaft 4. The cam(s) 3 are mechanically coupled to the head 1 so as to provide mechanical continuity between the cam(s) 3 and the annular end 2. 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 may be formed by one or more parts. In the embodiment illustrated in figures 1 à 12c The cam locking device has two pivot shafts 4, preferably parallel. In the embodiment illustrated in figures 4 , 5a, 5b, 5c, 6a, 6b , 6c , 10 , 11a, 11b, 11c, 12a, 12b, 12c , the cam 3 defines an orifice 3Y intended to house the pivot shaft 4 so that the cam pivots around the pivot shaft 4.

[0031] Conventionally, the annular end 2 is shaped like a ring that defines a through hole configured to receive a carabiner. The annular end 2 is capable of supporting the weight of a user. The ring defines a through hole configured to receive part of the hand during the actuation phases of the cams 3.

[0032] 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 wire element 5 is fixed to the head 1 so as to mechanically couple the wire element 5 and the head 1. The wire element 5 extends along a first direction XX so as to achieve mechanical holding along this first direction XX. The pivot shaft 4 extends primarily along a second direction YY, which is perpendicular or substantially perpendicular to the first direction XX.

[0033] The wire element 5 is attached to the head 1 and extends continuously from the head 1 to the annular end 2 to provide mechanical continuity along the locking device. The wire element 5 may be in the form of a ring, preferably a ring made of textile material. The wire element 5 may be a strap or a rope. The textile ring may be a ring made of polyethylene with a very high molecular weight, for example, a material marketed under the names Dyneema or Spectra. A metallic wire element, for example, a cable, may also be used.

[0034] In a particular embodiment, the head 1 is provided with an anchor, preferably an anchor in the form of a shaft. Preferably, the wire element 5 goes around the anchor in order to fix the wire element 5 to the anchor so as to allow the load to be transferred to the annular end 2. In other words, the wire element 5 defines at least one loop and the anchor shaft passes through the loop to transfer the load.

[0035] It is advantageous to obtain the ring by sewing the two ends of the wire element 5 together, the wire element 5 being a textile. Sewing is a well-established process, which facilitates obtaining 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.

[0036] The locking device preferably includes a rod 6 extending from the head 1 to the annular end 2. Preferably, the rod 6 is more rigid than the wire element 5 perpendicular to the first direction XX, which makes it possible to hold the cam locking device by means of the rod 6 and to place the locking device precisely in a crack compared to an equivalent device without the rod 6.

[0037] 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 slidably mounted along a first direction XX connecting the head 1 and the annular end 2. The trigger 7 is slidably mounted along the wire element 5 and, where applicable, along the rod 6. The trigger 7 moves relative to the head 1 and the annular end 2.

[0038] In other words, 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 its retracted position. Preferably, the trigger 7 is coupled to all the cams 3 such that the movement of the trigger 7 away from the head 1 causes the cams 3 to move towards their retracted position. The first trigger position is closer to the head 1 than the second trigger position.

[0039] The trigger 7 is movable between a first trigger position and a second trigger position. In the first trigger position, the cam(s) 3 may be in the extended position. In the second trigger position, the cam(s) 3 are in the retracted position. Outside the first trigger position, the cam(s) 3 are outside the extended position.

[0040] It is advantageous that a movement of the trigger 7 towards the head 1 does not impose any movement of the cam 3 and in particular does not translate into a movement of the cam 3 towards the extended position.

[0041] Preferably, the rod 6 extends continuously from the head 1 to the annular end 2 so as to provide good mechanical hold when the locking device is held by the annular end 2 and the trigger 7. It is advantageous that the trigger 7 be mounted to slide along the rod 6 and that the rod 6 separate the wire element 5 and the trigger 7. The rod 6 is preferably hollow.

[0042] 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 is coupled to the cam 3 or to each cam 3 by a textile wire element 8. The textile wire element 8 is a textile element, preferably a wire element made of a synthetic material, for example, plastic. The textile wire element 8 couples the cam 3 to the trigger 7 and allows a movement of the trigger 7 towards the annular end 2 to be translated into a movement of the cam 3 towards the retracted position. The textile wire element 8 is illustrated in figures 1, 2, 3, 4 , 6a, 6b , 6c , 7, 8, 9 , 10 , 12a, 12b et 12c .

[0043] The textile wire element 8 forms a flexible link between the cam 3 and the trigger 7.

[0044] The flexible link allows the cam 3 to be moved towards the retracted position when the trigger 7 is moved towards the annular end 2. The flexible link does not allow the cam 3 to be moved towards the extended position when the trigger 7 is moved towards the head 1.

[0045] Advantageously, the trigger 7 has anchor holes 7a which are intended for the passage of the textile wire element 8 through the trigger 7. The textile wire element 8 extends from the trigger 7 to one of the cams 3. Preferably, the first and second opposite ends of the textile wire element 8 are fixedly mounted to one of the cams 3 and the textile wire element 8 is fixed to the trigger 7 so that the movement of the trigger 7 towards the annular end 2 causes the cams 3 to pivot towards the retracted position.

[0046] The cam locking device has a spring 9 configured to move at least one cam 3 towards the extended position. The spring 9 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.

[0047] In the absence of any load or obstruction, the spring 9 places the cam(s) 3 in the extended position. The force applied to the trigger 7 to move away from the head 1 corresponds to a force applied to the cam 3 that is opposite to the force applied by the spring 9 to move the cam(s) 3 to the retracted position. In one embodiment, the spring 9 is attached on one side to the cam 3 and on the other side to the head 1. In another embodiment, the spring 9 is attached on one side to a first cam 3' and on the other side to a second cam 3", which is, for example, mounted on a different pivot shaft 4 than the first cam 3'. The locking device may include as many springs 9 as there are cams 3 or as many springs 9 as there are pairs of cams 3. The springs 9 are illustrated in the figures. figures 1 et 3 The figures illustrate 3z mounting holes intended for attaching the ends of the springs 9.

[0048] By moving the cam(s) 3 towards the extended position, the spring 9 moves the trigger 7 towards the first trigger position. The spring 9 is configured so that the extended position and the first trigger position are rest positions of the locking mechanism, i.e., in the absence of any external force.

[0049] The cam locking device includes at least one rod 6 extending from the head 1 towards the annular end 2, i.e., along the first direction XX. In the embodiments illustrated in figures 1 à 10 , the cam locking device comprises a single rod 6 which extends longitudinally along the first direction XX against the head 1 and which defines the through hole of the annular end 2.

[0050] It is particularly advantageous to make the cam(s) 3 out of a metallic material, preferably in an aluminium alloy or in steel.

[0051] The use of a textile wire element 8 to provide the mechanical connection between the cam(s) 3 and the trigger 7 is particularly advantageous compared to a metal wire element. However, it is also important that the locking device be able to effectively secure the textile wire element 8 to the cam 3, i.e., a fixed mounting of a portion of the textile wire element 8 on a part of the cam 3. The attachment must withstand the forces between the trigger 7 and the cam 3. This precaution allows the movement of the trigger 7 towards the annular end 2 to be effectively translated into a pivoting of the cam 3 towards the retracted position. It is also important that this attachment of the end of the textile wire element 8 does not create a significant bulk, as this complicates its use in small locking devices.Preferably, the fixing configuration which achieves the fixing between the end of the textile wire element 8 and a cam 3 also ensures a function of adjusting the length of the textile wire element 8 in order to better adapt to the actual length of the textile wire element 8 and to the spacing between the rest position of the trigger 7 and the cam 3.

[0052] During manufacturing, the textile wire element 8 is produced to a target length. However, due to manufacturing variations, the actual length may be slightly longer or shorter than the target length. This affects the position of the trigger 7 relative to the head 1, thus altering the operation of the locking mechanism. If the textile wire element 8 is too short, it is not possible to reach the extended position where the cam 3's footprint is at its maximum. If the textile wire element is too long, complete retraction of the cams may not be possible, or the excess textile wire element 8 may obstruct the movement of the cams 3, or it may need to be cut. It is therefore advantageous to ensure that length variations can be compensated for when attaching the textile wire element 8 to the cam 3.

[0053] The inventors observed that multiple passages of the textile wire element 8 through holes and / or grooves in the cam 3 generate significant friction between the textile wire element 8 and the cam 3. This friction ensures the attachment of the textile wire element 8 to the cam 3 and the movement of the cam 3 when the trigger 7 is moved towards the annular end 2.

[0054] To ensure effective attachment of one end of the textile wire element 8 to a cam 3, the cam 3 defines at least one first hole 3a and a second hole 3b, both of which are through holes. These holes connect one side of the cam 3 with a second side of the cam 3. The first side is opposite the second side along a second direction YY, which corresponds to the pivot axis of the cam(s) 3. The strand of the textile wire element 8 passes through the first hole 3a and through the second hole 3b. The first hole 3a is distinct from the second hole 3b, and the two holes are separated by a strip of material. In other words, the two holes are not contiguous.

[0055] To ensure effective fastening of one end of the textile wire element 8 with a cam 3, the cam 3 defines at least one of a third hole 3c or a groove 3d. The third hole 3c is a through hole that connects the first and second sides. The third hole 3c may be adjacent to either the first hole 3a or the second hole 3b, or it may be located some distance from the two preceding holes. The groove 3d may be formed on the surface of either the first or second side. The groove 3d has at least one portion whose width is less than or equal to the width of the textile wire element 8. The textile wire element 8 is clamped by being inserted into the groove 3d. IlIt is advantageous for the textile wire element 8 to enter the first hole 3a from the second side towards the first side and for the groove 3d to be formed in the first side. The textile wire element 8 enters the first hole 3a from the second side towards the first side in a path along the longitudinal direction of the textile wire element 8 from the trigger 7.

[0056] In other words, a terminal portion of the textile wire element 8 passes through the third hole 3c connecting the first and second sides and / or is wedged into the groove 3d formed in the first or second side. The terminal portion of the textile wire element 8 is positioned posterior to the second hole 3b along a longitudinal direction of the textile wire element 8 from the trigger 7.

[0057] In a particular embodiment illustrated in figures 1 à 12c Cam 3 defines the first hole 3a, the second hole 3b, and the third hole 3c. The textile wire element 8 passes through the first hole 3a, the second hole 3b, and the third hole 3c. The textile wire element 8 passes successively through the first hole 3a, the second hole 3b, and the third hole 3c along the longitudinal direction of the textile wire element 8 from the trigger 7. The longitudinal direction is the direction that connects the two opposite ends of the textile wire element 8. For example, the two ends are fixed to two different cams 3.

[0058] As illustrated in figures 1, 2, 4 , 6a, 6b, 6c , 7, 8, 10 , 12a, 12b et 12c The textile thread element 8 travels from the first side to the second side and vice versa, passing through the holes. Changes in direction cause the textile thread element 8 to touch the ends of the holes, thus introducing friction. This friction ensures the textile thread element 8 is secured. Depending on the requirements, at least a fourth hole can be added to increase friction.

[0059] The cross-sections of the first hole 3a, the second hole 3b, and the third hole 3c may be identical or different. Preferably, the cross-sections are slightly larger than or equal to the cross-section of the textile wire element 8 to allow for easier passage of the textile wire element 8 during the manufacture of the locking device or during the replacement of the textile wire element 8.

[0060] Preferably, the third through hole 3c is located in the angular sector bounded by the line connecting the pivot axis of cam 3 and the center of the first hole 3a, and by the line connecting the pivot axis of cam 3 and the center of the second hole 3b. Observation is made along the pivot axis of cam 3, as illustrated in the diagrams. figures 5a, 5c , 11a et 11c The center of the first hole 3a and the center of the second hole 3b are understood to be the center of the circle when the hole is circular, or the centroid of the shape defined by the hole. With such an arrangement, the textile wire element 8 has a portion that is directed in the opposite direction to the direction taken by a previous portion along the longitudinal direction of the textile wire element 8. The direction is observed along the textile wire element 8 from the trigger 7 to the termination of the textile wire element 8.

[0061] Advantageously and as illustrated in figures 4 , 6a, 6b, 6c , 10 , 12a, 12b et 12c The textile wire element 8 forms a ring surrounding the cam 3. A first strand 8a of the textile wire element 8 is held against one face of the cam 3 by a second strand 8b of the same textile wire element. The first strand 8a of the textile wire element 8 is further from the portion connected to the trigger 7 than the second strand 8b along the longitudinal direction of the textile wire element 8. When the trigger 7 moves towards the annular end 2, the second strand 8b exerts force on the first strand 8a to press it against the face of the cam 3. The force applied by the second strand 8b prevents the first strand 8a from moving, thus securing the textile wire element 8 to the cam 3. The first strand 8a of the textile wire element 8 is fixed to the cam 3.

[0062] More generally, an upstream strand clamps a downstream strand against a side face of the cam 3. The greater the force applied by the trigger 7, the more the upstream strand clamps the downstream strand against the cam, and the more secure the fastening. The upstream portion is the part closest to the trigger 7 along the longitudinal direction of the textile thread element 8. This configuration can be used with three, four, or more holes passing through the cam 3.

[0063] Advantageously, the first strand 8a is a terminal strand of the textile wire element 8 which is wedged against one face of the cam 3 by a second strand 8b of the textile wire element 8. The terminal strand is the part of the textile wire element 8 furthest from the portion connected to the trigger 7.

[0064] The fastening can be free of glue and knots and ensure that it can withstand the forces applied by the trigger 7 on the cam 3 to oppose the forces of the spring 9. The thickness of the fastening corresponds approximately to twice the thickness of the textile wire element 8. It is advantageous to thin a portion of the cam 3 to form a thinned zone 3e so that the strand(s) of the textile wire element 8 do not form a protruding area beyond the cam's footprint, i.e. the volume occupied by the cam 3 in its movements between the extended and retracted positions in the absence of the textile wire element 8.

[0065] In an advantageous embodiment illustrated in figures 4 , 5a et 5c The first through hole 3a, the second through hole 3b, and the third through hole 3c are aligned. When a force is applied to the textile wire element 8 in the direction of the trigger 7, the first strand 8a and the second strand 8b tend to move in different directions. This arrangement of the two strands makes the movement of the first strand 8a and the second strand 8b more difficult.

[0066] In an alternative illustrated implementation to figures 10 , 12a et 12c The first through hole 3a, the second through hole 3b, and the third through hole 3c are not aligned, but the cam 3 defines a recess 3f with a wall 3g. The recess 3f is a thinned area. The wall 3g connects the three holes such that the portion of the textile thread element 8 connecting the first hole 3a and the second hole 3b overlaps the third hole 3c in an observation along the second direction YY. The first strand 8a is held against the wall of the cam 3 by means of the second strand 8b, as in the previous embodiment.

[0067] The configurations shown above are particularly advantageous because they allow the textile wire element 8 to be fixed with the cam 3 and they offer freedom to adjust the length of the textile wire element 8. Preferably, installing the terminal portion of the textile wire element 8 in a recess of the cam 3 ensures that the excess of the textile wire element 8 will not interfere with the movement of the cams 3 relative to each other.

[0068] As an alternative or in addition to the third hole 3c, the cam 3 can define a groove 3d on one of its sides. Advantageously, the groove 3d is located after the first hole 3a and after the second hole 3b, along the longitudinal direction of the textile wire element 8 from the trigger 7. The groove 3d allows a portion of the textile wire element 8 to be clamped, preferably the terminal portion of the textile wire element 8. Preferably, the groove 3d allows a greater or lesser quantity of the textile wire element 8 to be clamped, thus enabling adjustment of the effective length of the textile wire element 8.

[0069] As preferably illustrated in the various figures, groove 3d is positioned between the second hole 3b and the third hole 3c. In addition to having the first strand 8a held against the wall of the cam 3 by means of the second strand 8b, the first strand 8a is installed in groove 3d, which provides further support for the first strand 8a. The textile wire element 8 is then able to withstand significantly greater forces.

[0070] Advantageously, the 3d groove connects the first hole 3a and the third hole 3c as illustrated in figures 5a And 11a This configuration improves the compromise between the fixing of the textile wire element 8, the size of the cam 3 and the mechanical resistance of the cam 3.

[0071] In a particular embodiment illustrated in figures 5b, 6b , 11b et 12b The textile wire element 8 passes successively through the first hole 3a and the second hole 3b along its longitudinal direction from the trigger 7 before becoming wedged in the groove 3d and / or passing through the third hole 3c. The successive passages of the textile wire element 8 through the multiple holes introduce changes in its direction and thus friction between the textile wire element 8 and the cam 3. The textile wire element 8 bears against each end of the first hole 3a, the second hole 3b, and the third hole 3c, as applicable. Each point of contact generates friction that makes it more difficult for the textile wire element 8 to slide relative to the cam 3.

[0072] In order to have significant friction between the textile wire element 8 and the cam 3, it is preferable that at least one of the first hole 3a, the second hole 3b and the third hole 3c define a sharp edge with the wall that defines the first side or the second side of the cam 3. Preferably, the angle between the lateral wall of the hole and the wall of the side is between 75° and 105°, more preferably equal to 90°.

[0073] Advantageously, the first hole 3a has a second end with a bearing area whose edge is less sharp than at least one other edge on which the textile fiber element 8 rests. In other words, the edge of the bearing area of ​​the second end is less sharp than the edge of the bearing area of ​​the first end of the first hole 3a, or than the edge of any of the bearing areas of the second hole 3b or the third hole 3c, as applicable. Preferably, the first hole 3a has a second end whose bearing area edge is less sharp than the edge of the other bearing area of ​​the first hole 3a and than the edges of the second hole 3b. Even more preferably, the first hole 3a has a second end whose edge is less sharp than all the other edges on which the textile fiber element 8 rests.Less sharp is defined as an edge where the angle between the side wall of the hole and the side wall of the cam's lateral edge is further from 90° than the comparison edge. It also means that the bearing area has a greater number of edges, for example, two, three, or four.

[0074] Advantageously, the first hole 3a has a second end whose bearing area has a rounded edge, that is, no sharp edge. When the edge is rounded, it is advantageous for the edge to define a radius that is greater than half the thickness of the textile wire element 8, preferably greater than twice the thickness of the textile wire element 8. A bearing area with a rounded edge corresponds to a bearing area that has an infinite number of edges.

[0075] The inventors observed that the stress applied by the trigger 7 on the textile wire element 8, in conjunction with the pivoting of the cam 3, degrades the textile wire element 8 in the friction zone. This behavior is not observed at other support points where the displacements are much smaller. By introducing a greater number of edges, and preferably a rounded portion, it is possible to improve the lifespan of the textile wire element 8, thus allowing for a wider choice of available materials and usable cross-sections. In particular, this makes it possible to reduce the cross-section of the textile wire element 8, which is preferable for small locking devices because it allows for smaller cross-sections of holes, grooves, and tapered areas.

[0076] In a preferred embodiment illustrated in figures 1 à 12cThe first hole 3a and the second hole 3b open into a tapered area of ​​at least one cam 3. The tapered area represents a thinning at least equal to the thickness of one strand of the textile thread element 8. The tapered area on the first side represents a thinning relative to the most prominent area of ​​the first side. The tapered area on the second side represents a thinning relative to the most prominent area of ​​the second side. The prominentness is observed along the pivot axis of the cam 3. The prominent area is the area furthest from the median plane of the cam and perpendicular to the second direction YY. The use of a tapered area, preferably tapered on each side, allows the cams to be brought closer together without the textile thread element 8, which winds between the opposite sides, interfering with the pivoting.

[0077] As mentioned above, it is preferable that the cross-section of the textile wire element 8 be less than the cross-section of the first hole 3a and the second hole 3b from one end to the other of the textile wire element 8 along the longitudinal direction of the textile wire element 8. The cross-section is observed in the absence of any stress, in particular longitudinal tensile stress on the textile wire element 8 so as to allow easy installation by an individual.

[0078] In a preferred embodiment, the textile thread element 8 is attached to the cam 3 solely by wedging it into the groove 3d and / or by friction at the ends of the first hole 3a, the second hole 3b, and the third hole 3c. This configuration prevents the formation of a knot whose position and size are poorly controlled, thus avoiding variability in the effective length between the trigger 7 and the cam 3. This configuration also prevents the formation of a glue point whose quality can change over time, as the locking device is intended for outdoor use in various weather conditions.

[0079] In one particular embodiment, the cam-locking device has at least two cams 3. A first cam 3' and a second cam 3" are pivotally mounted, and the textile wire element 8 has a first end fixed to a first cam 3' and a second opposite end fixed to the second cam 3". The two cams define the holes and / or grooves as described above. Each of the two ends is fixed according to one of the embodiments previously presented.

[0080] For the manufacture of a cam locking device, the textile wire element 8 is provided on the one hand, and on the other hand the cam locking device as presented according to any of the previous configurations.

[0081] The textile wire element 8 is connected to the trigger 7, and the end of the strand of the textile wire element 8 is inserted into the first hole 3a, then into the second hole 3b. The end of the strand then passes through the third hole 3c or through the groove 3d. Preferably, the end of the strand then passes through the third hole 3c and is then fitted into the groove 3d.

[0082] Preferably, the third hole 3c is located in the angular sector defined by the first hole 3a, the axis of rotation of the cam 3, and the second hole 3b. The passage of the textile thread element 8 through the three holes allows the formation of a ring whose terminal end of the strand is held in place by another strand.

[0083] In order to adjust the textile wire element 8 to the correct length, it is advantageous to pass the textile wire element 8 through the holes and possibly the groove(s) then place the end of the strand in the groove intended to receive this part of the strand or between the last two holes used to fix the textile wire element 8 then pull the trigger 7 to ensure the jamming of the textile wire element 8 and thus the fixing with the cam 3.

[0084] Preferably, one end of the textile wire element 8 is fixed to a first cam 3' before fixing the other end according to the process described above.

Claims

1. Camming clamping device comprising: - a head (1); - at least one cam (3) installed in movable manner pivoting around at least one pivot shaft (4), the at least one cam (3) being movable between a retracted position and an extended position, the at least one pivot shaft (4) being fixed to the head (1), the at least one cam (3) defining at least a first hole (3a) and a second hole (3b) that are pass-through between a first side and a second side of the at least one cam (3); - a spring (9) functionally 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); - a rod (6) extending from the head (1) to the annular end (2); - a trigger (7) mounted movable between a first trigger position and a second trigger position, - a textile wire element (8) having a first end installed fixedly with the at least one cam (3), the textile wire element (8) connecting the trigger (7) to the at least one cam (3), the textile wire element (8) linking the trigger (7) functionally to the at least one cam (3), when the trigger (7) is in the second trigger position the at least one cam (3) is in the retracted position; camming clamping device characterised in that the textile wire element (8) passes through the first hole (3a) and the second hole (3b) to introduce friction between the textile wire element (8) and the at least one cam (3), and in that a terminal portion of the textile wire element (8) passes through a third hole (3c) connecting the first side and the second side and / or is wedged in at least one groove (3d) arranged in the first side or the second side, the terminal portion of the textile wire element (8) being arranged posteriorly to the second hole (3b) in a longitudinal direction of the textile wire element (8) away from the trigger (7).

2. Camming clamping device according to claim 1 wherein the at least one cam (3) defines the third hole (3c) and wherein a downline strand of the textile wire element (8) is wedged against a face of the at least one cam (3) by an upline strand of the textile wire element (8), the downline strand being located farther from more the trigger (7) than the upline strand in the longitudinal direction of the textile wire element (8).

3. Camming clamping device according to one of claims 1 and 2 wherein the at least one cam (3) defines the at least one groove (3d) and wherein a terminal end of the textile wire element (8) is embedded in the at least one groove (3d).

4. Camming clamping device according to claim 3 wherein the at least one groove (3d) connects the first hole (3a) and the third hole (3c).

5. Camming clamping device according to claim 4 when it depends on claim 2 wherein the downline strand is wedged in the at least one groove (3d).

6. Camming clamping device according to anyone of claims 1 to 5 wherein the textile wire element (8) passes successively via the first hole (3a) and the second hole (3b) in the longitudinal direction of the textile wire element (8) away from the trigger (7), wherein the first hole (3a) defines a first end with the first side and a second end with the second side, wherein the textile wire element (8) enters the first hole (3a) from the second side, the second end forming a second pressing area of the textile wire element (8) and wherein the second pressing area has an edge that is less sharp than an edge of the first end of the first hole (3a) and / or less sharp than an edge of the second hole (3b) with one and / or the other of the first side and the second side.

7. Camming clamping device according to claim 6 wherein a side wall of the first hole (3a) connects a face of the at least one cam (3) forming the second side, and wherein the side wall of the first hole (3a) defines a sharp edge with the second face of the at least one cam (3) and / or a side wall of the second hole (3b) defines a sharp edge with the first face or the second face of the at least one cam (3).

8. Camming clamping device according to claim 6 wherein a side wall of the first hole (3a) connects a face of the at least one cam (3) forming the second side, and wherein the pressing area of the second end is an arc of a circle having a radius of curvature at least equal to half the thickness of the textile wire element (8).

9. Camming clamping device according to claim 7 wherein the side wall of the first hole (3a) defines a sharp edge with the second face of the at least one cam (3) and / or a side wall of the second hole (3b) defines a sharp edge with the first face or the second face of the at least one cam (3).

10. Camming clamping device according to anyone of claims 1 to 9 wherein the first hole (3a) and the second hole (3b) open into a thinned area (3e) or a recess (3f) of the at least one cam (3), the thinned area (3e) or the recess (3f) representing a thinning at least equal to a thickness of a strand of the textile wire element (8).

11. Camming clamping device according to anyone of the preceding claims wherein, from one end to of the textile wire element (8) to the other and in the longitudinal direction of the textile wire element (8), a cross-section of the textile wire element (8) is smaller than a cross-section of the first hole (3a) and of the second hole (3b).

12. Camming clamping device according to anyone of the preceding claims wherein the textile wire element (8) is only fixed to the at least one cam (3) by wedging in the at least one groove (3d) and / or by friction at the ends of the first hole (3a), the second hole (3b) and the third hole (3c).

13. Camming clamping device according to anyone of the preceding claims wherein the at least one cam (3) has a first cam (3') and a second cam (3") and wherein the textile wire element (8) has a first end fixed to the first cam (3') and an opposite second end fixed to the second cam (3").

14. Method for manufacturing a camming clamping device comprising provision of a textile wire element (8) and a camming clamping device provided with: - a head (1); - at least one cam (3) mounted movable pivoting around at least one pivot shaft (4), the at least one cam (3) being movable between a retracted position and an extended position, the at least one pivot shaft (4) being fixed to the head (1), the at least one cam (3) defining at least a first hole (3a) and a second hole (3b); - a spring (9) functionally 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); - a rod (6) extending from the head (1) to the annular end (2); - a trigger (7) functionally coupled to the at least one cam (3), the trigger (7) being mounted movable between a first trigger position and a second trigger position, and in the second trigger position the at least one cam (3) is in the retracted position; method for manufacturing characterized in that the at least one cam (3) comprises at least a third hole (3c) and / or at least one groove (3d); wherein the textile wire element (8) passes through the first hole (3a), the second hole (3b) and the at least a third hole (3c) to form consecutive friction areas between the textile wire element (8) and the at least one cam (3) along a longitudinal direction of the textile wire element (8); and / or wherein the at least one groove (3d) has a width that is less than or equal to a width of the textile wire element (8), the textile wire element (8) being embedded by deformation in the at least one groove (3d).