Cam clamping device

Abstract

A cam clamping device comprises a head (1), a cam (3) and a spring (9) biasing the cam (3) to an extended position. The spinning thread element (8) connects the cam (3) to a trigger (7), which is assembled to be movable between a first position and a second position. The cam (3) defines a first bore (3a) and a second bore (3b). The textile thread element (8) passes through the first hole (3a) and the second hole (3b) to introduce friction between the textile thread element (8) and the cam (3). The end portion of the spinning thread element (8) passes through a third hole (3c) of the side face of the connecting cam and / or is wedged into a groove (3d) arranged in one of the side faces. An end portion of the textile thread element (8) is arranged behind the second hole (3b) in a longitudinal direction of the textile thread element (8) away from the trigger (7).

Description

Technical Field

[0001] This utility model relates to a cam clamping device. Background Technology

[0002] During the climbing phase, climbers need to place anchors on the rock face. Climbers install several anchors in succession, designed to support them in the event of a fall. Some rock faces are equipped with pre-installed anchors, such as nozzles sealed within the rock. Other rock faces do not have such anchors, meaning climbers must find the most suitable openings to install their anchors.

[0003] When a climber must place his protection point, he typically installs both passive and active wedges. Wedges are designed to insert into gaps, which are typically holes, fissures, channels, or any other groove deep enough for the wedge to be inserted. Each specific shape of gap is suited to a specific wedge configuration. Passive wedges are usually formed from metal parts with a specific shape. In a first spatial position, the guide block can be inserted into a fault in the rock face, and in a second spatial position, the wedge is wedged between two opposing faces. Wedges can then be easily installed and removed, or wedged in, provided the wedge is placed in the hole with the correct spatial configuration.

[0004] Besides passive wedges, known active wedges are also called cam wedges or cam clamping devices. Cam wedges are provided with a head having multiple cams. The cams are movably mounted about one or more rotational axes.

[0005] The cam moves between a retracted position and an extended position. In the retracted position, the head size is smaller than in the extended position. The wedge head inserts into the crack in its retracted position, and then the cam attempts to move to the extended position, pressing the cam against the two opposing surfaces of the crack. When tension is applied to the wedge, the shape of the cam has the effect of increasing the force applied to the crack surface.

[0006] In the traditional design, the cam wedge has a head with multiple rotating cams at its first end. The second end of the cam wedge is an annular end, configured to receive a hook and serve as an anchor point for the climber.

[0007] The cam is actuated by a trigger, which is mounted to slide movably along the rod. When the user pulls the trigger in the direction of the annular end, the cam moves to the retracted position. When the user stops pulling, a spring returns the cam to the extended position.

[0008] One or more movable cams are pivotally mounted and connected to a trigger via one or more wire elements, typically piano wire-type steel cables. Conventionally, each end of the cable is secured to a movable cam, and the cable passes through the trigger to form a mechanical connection between the cam and the trigger. Securing can be done by crimping or upsetting. Due to the small cross-section of the cable, it deteriorates rapidly and frequently breaks, requiring repair at an approved center. Furthermore, the more the cable's cross-section decreases and the smaller the cross-section of the rotating cam, the more difficult it is to secure the cable with the rotating cam.

[0009] In an alternative embodiment, the steel cable is replaced by a textile cable. Each end of the cable is secured to a cam. Each cam is provided with a hole through which the textile cable can pass. The end of the textile cable is secured to the cam by adhesive and / or by means of a knot with a cross-section larger than the cross-section of the hole. As the thickness of the knot makes it difficult to control the textile cable to extend beyond the cam and / or the length of the cable, securing it by adhesive or knot becomes increasingly complex as the size of the wedge decreases.

[0010] When manufacturing a cam clamping device, the length of the wire element is uncertain before it is fixed to the trigger and the cam, and the effective length of the wire element is uncertain after it is attached to the cam. These variations mean that the performance of the cam clamping device can vary, or must be compensated for by a spring used to separate the trigger and the cam to stretch the wire element. Utility Model Content

[0011] One object of this invention is to provide a cam clamping device in which the mechanical connection between the trigger and the movable cam is better controlled and preferably easier to replace.

[0012] According to one feature of this utility model, the cam clamping device includes:

[0013] -head;

[0014] - At least one cam is mounted in a movably pivotable manner about at least one pivot axis, the at least one cam being movable between a retracted position and an extended position, the at least one pivot axis being fixed to the head, and the at least one cam defining at least a first hole and a second hole passing through between a first side and a second side of the at least one cam;

[0015] - A spring, functionally coupled to the at least one cam, to bias the at least one cam to the extended position;

[0016] - An annular end, which is mechanically connected to the head;

[0017] - A rod, the rod extending from the head to the annular end;

[0018] - A trigger, which is mounted to be movable between a first trigger position and a second trigger position.

[0019] - A textile thread element having a first end fixedly mounted to the at least one cam, the textile thread element mechanically connecting the trigger to the at least one cam, the textile thread element functionally connecting the trigger to the at least one cam, wherein when the trigger is in the second trigger position, the at least one cam is in the retracted position.

[0020] The notable feature of the cam clamping device is that the textile thread element passes through the first hole and the second hole to introduce friction between the textile thread element and at least one cam, and the end portion of the textile thread element passes through the third hole connecting the first side and the second side and / or weds into a groove arranged in the first side or the second side, the end portion of the textile thread element being arranged behind the second hole in the longitudinal direction of the textile thread element away from the trigger.

[0021] The cam preferably defines a third hole. The downward strand of the textile element wedges into the surface of at least one cam through the upward strand of the textile element, the downward strand being further away from the trigger in the longitudinal direction of the textile element than the upward strand.

[0022] In an advantageous manner, at least one cam defines at least one groove. The end of the textile thread element is embedded in at least one groove.

[0023] In a particular configuration, the groove connects the first hole and the third hole.

[0024] In a favorable improvement scheme, the downward-sloping stock is wedged into the groove.

[0025] Preferably, the textile thread element passes successively through the first hole and the second hole in a longitudinal direction away from the trigger. The first hole defines a first end with a first side and a second end with a second side. The textile thread element enters the first hole via the second side, and the second end forms a second pressing area of ​​the textile thread element. The second pressing area has an edge that is less sharp than the edge of the first end of the first hole, and / or less sharp than the edge of the second hole at one and / or the other end of the first and second sides.

[0026] According to one embodiment, the sidewall of the first hole is connected to the surface of at least one cam forming a second side. The pressing area at the second end is an arc with a radius of curvature at least equal to half the thickness of the textile element.

[0027] In an advantageous improvement, the sidewall of the first hole defines a sharp edge with the second face of at least one cam, and / or the sidewall of the second hole defines a sharp edge with the first or second face of at least one cam.

[0028] Preferably, the first hole and the second hole lead to the thinning region of at least one cam, the thinning region representing a thinning at least equal to the thickness of the strand of the textile element.

[0029] In another advantageous improvement, the cross-section of the textile element is smaller than the cross-section of the first hole and the second hole in the longitudinal direction of the textile element from one end to the other.

[0030] Preferably, the textile thread element is secured to at least one cam only by wedging into a groove and / or by friction at the ends of the first, second, and third holes.

[0031] In an advantageous configuration, the at least one cam has a first cam and a second cam. The textile thread element has a first end fixed to the first cam and an opposing second end fixed to the second cam. Attached Figure Description

[0032] Other advantages and features will become more apparent from the following description of specific embodiments and implementations of the present invention, given for non-limiting illustrative purposes only and illustrated in the accompanying drawings, wherein:

[0033] - Figure 1 A perspective view of the cam clamping device is shown schematically.

[0034] - Figure 2 A side view of the cam clamping device is schematically shown;

[0035] - Figure 3 A schematic front view of the cam clamping device is shown.

[0036] - Figure 4 A perspective view of the movable cam and textile thread element is shown schematically.

[0037] - Figure 5a A schematic view of the first side of a movable cam with strands of textile yarn elements is shown;

[0038] - Figure 5b A schematic cross-sectional view of the movable cam along AA is shown.

[0039] - Figure 5c A schematic view of the second side of the movable cam is shown;

[0040] - Figure 6a A schematic view of the first side of a movable cam with strands of textile yarn elements is shown;

[0041] - Figure 6b A schematic cross-sectional view of the movable cam along AA is shown, in which the strands of the textile yarn element pass through the movable cam multiple times;

[0042] - Figure 6c A view of the second side of a movable cam with strands of textile yarn elements is schematically shown;

[0043] - Figure 7 A perspective view of another cam clamping device is schematically shown;

[0044] - Figure 8 A side view of another cam clamping device is schematically shown;

[0045] - Figure 9 A schematic front view of another cam clamping device is shown;

[0046] - Figure 10 A perspective view of the movable cam and the yarn element of another cam clamping device is schematically shown;

[0047] - Figure 11a A schematic view of the first side of the movable cam of another cam clamping device is shown;

[0048] - Figure 11b A schematic cross-sectional view of the movable cam along AA of another cam clamping device is shown.

[0049] - Figure 11c A schematic view of the second side of the movable cam of another cam clamping device is shown;

[0050] - Figure 12a A schematic view of the first side of a movable cam with a strand of textile yarn element is shown for another cam clamping device;

[0051] - Figure 12b A schematic cross-sectional view of a movable cam along AA is shown, in which the strands of the textile yarn element pass through the movable cam of another cam clamping device multiple times;

[0052] - Figure 12c A schematic view of the second side of a movable cam with a strand of textile yarn element is shown for another cam clamping device. Detailed Implementation

[0053] Figures 1 to 12c Different embodiments of a cam clamping device, also known as a "cam clamper," are shown. The cam clamping device is preferably an active clamping device.

[0054] The cam clamping device includes a first end with a head 1 and an opposing second end as an annular end 2. The head 1 is coupled to at least one cam 3, and preferably to a plurality of cams 3 mounted to pivot between an extended position and a retracted position. The dimension in the extended position is greater than the dimension in the retracted position. One or more cams 3 are mounted to be movable about at least one pivot axis 4. The one or more cams 3 are mechanically coupled to the head 1 to provide mechanical continuity between the cams 3 and the annular end 2. The pivot axis 4 is fixed to the head 1. More specifically, the pivot axis 4 is fixed to the body 1a of the head 1. The body 1a may be formed of one or more parts. Figures 1 to 12c In the illustrated embodiment, the cam clamping device has two preferably parallel pivot shafts 4. Figure 4 , Figure 5a , Figure 5b , Figure 5c , Figure 6a , Figure 6b , Figure 6c , Figure 10 , Figure 11a , Figure 11b , Figure 11c , Figure 12a , Figure 12b , Figure 12c In the embodiment shown, cam 3 defines a hole 3Y, which is designed to receive a pivot shaft 4, such that the cam pivots about the pivot shaft 4.

[0055] In a conventional manner, the annular end 2 is in the form of a ring, which defines a through hole configured to receive a hook. The annular end 2 is capable of supporting the user's weight. The ring defines a through hole that is configured to receive part of the hand during the actuation phase of the cam 3.

[0056] The cam clamping device has a wire element 5 that mechanically connects a head 1 to an annular end 2. The wire element 5 mechanically connects a cam 3 to the annular end 2, such that a user attached to the annular end 2 is secured by the cam 3 wedged into, for example, a crack. The wire element 5 is the portion providing mechanical continuity between the head 1 and the annular end 2. The wire element 5 is fixed to the head 1 to mechanically connect the wire element 5 and the head 1. The wire element 5 extends in a first direction XX to provide mechanical strength in that direction. The pivot shaft 4 extends primarily in a second direction YY, perpendicular to or substantially perpendicular to the first direction XX.

[0057] The wire element 5 is fixed to the head 1 and extends continuously from the head 1 until it reaches the annular end 2, providing mechanical continuity along the clamping device. The wire element 5 can be in the form of a loop, preferably a loop made of textile material. The wire element 5 can be a belt or rope. The textile loop can be a loop made of high molar mass polyethylene, for example, made of material sold under trade names such as Dyneema or Spectra. Metal wire elements, such as cables, can also be used.

[0058] In a particular embodiment, the head 1 is provided with an anchor, preferably in the form of a shaft. Preferably, the wire element 5 passes around the anchor to secure the wire element 5 so that strain can be absorbed by the annular end 2. In other words, the wire element 5 defines at least one ring, and the anchor shaft passes through the ring to perform strain absorption.

[0059] Advantageously, the loop is achieved by sewing the two ends of the thread element 5, which is made of fabric, to each other. Sewing is a well-managed technique that makes it easy to obtain loops with good mechanical strength. Using the sewing step can form loops that are cheaper and easier to control in size than loops obtained by splicing. It is advantageous that the loop does not involve crimping or splicing.

[0060] The clamping device preferably includes a rod 6 extending from the head 1 to the annular end 2. In a preferred embodiment, the rod 6 is more rigid than the line element 5 in the first direction XX, which allows the cam clamping device to be held by the rod 6 and, compared to an equivalent device without the rod 6, allows the clamping device to be placed in the crack with greater precision.

[0061] The clamping 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, which is mounted to slide along a first direction XX connecting the head 1 and the annular end 2. The trigger 7 is mounted to slide along the line element 5 and, if applicable, along the rod 6. The trigger 7 is movable relative to the head 1 and the annular end 2.

[0062] In other words, the trigger 7 is movably mounted relative to the head 1 and coupled to at least one cam 3. The trigger 7 is coupled to at least one cam 3 such that movement of the trigger 7 away from the head 1 causes at least one cam 3 to move to a retracted position. In a preferred embodiment, the trigger 7 is coupled to all cams 3 such that movement of the trigger 7 away from the head 1 causes multiple cams 3 to move to their retracted positions. The first trigger position is closer to the head 1 than the second trigger position.

[0063] The trigger 7 is movable between a first trigger position and a second trigger position. In the first trigger position, one or more cams 3 can be in the extended position. In the second trigger position, one or more cams 3 are in the retracted position. Outside the first trigger position, one or more cams 3 are not in the extended position.

[0064] Advantageously, the movement of trigger 7 in the direction of head 1 does not cause any movement of cam 3, especially not causing cam 3 to move to the extended position.

[0065] In a preferred embodiment, the lever 6 extends continuously from the head 1 to the annular end 2 to provide good mechanical strength when the clamping device is held by the annular end 2 and the trigger 7. Advantageously, the trigger 7 is slidably mounted along the lever 6, and the lever 6 separates the wire element 5 and the trigger 7. The lever 6 is preferably hollow.

[0066] In a preferred embodiment, the trigger 7 is mounted to slide along the thread element 5 between the head 1 and the annular end 2. The trigger 7 is coupled to the cam 3 or each cam 3 via a textile thread element 8. The textile thread element 8 is a textile element, preferably a thread element made of a synthetic material, such as plastic. The textile thread element 8 couples the cam 3 to the trigger 7 and allows movement of the trigger 7 toward the annular end 2 to be converted into movement of the cam 3 to a retracted position. The textile thread element 8... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6a , Figure 6b , Figure 6c , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 12a , Figure 12b and Figure 12c As shown in the image.

[0067] The textile element 8 forms a flexible link between the cam 3 and the trigger 7. When the trigger 7 moves in the direction of the annular end 2, the flexible link allows the cam 3 to be biased to the retracted position. When the trigger 7 moves in the direction of the head 1, the flexible link prevents the cam 3 from being biased to the extended position.

[0068] Advantageously, the trigger 7 has an anchoring hole 7a, which is designed to allow the textile thread element 8 to pass through the trigger 7. The textile thread element 8 extends from the trigger 7 to one of the cams 3. Preferably, opposite first and second ends of the textile thread element 8 are fixedly assembled to one of the cams 3, and the textile thread element 8 is fixed to the trigger 7 such that movement of the trigger 7 toward the annular end 2 causes the cam 3 to pivot to the retracted position.

[0069] The cam clamping device has a spring 9 configured to bias at least one cam 3 to an extended position. The spring 9 can be implemented using any technique; it can be a helical spring operating in traction, compression, torsion, or bending. It can also be formed from an elastically deformable blade or metal strip. Without any bias or obstruction, the spring 9 positions the cam or multiple cams 3 in the extended position. The force applied to the trigger 7 to move it away from the head 1 corresponds to the force applied to the cam 3, which is opposite to the force applied by the spring 9 to move one or more cams 3 to a retracted position. In one embodiment, the spring 9 is fixed to both the cam 3 and the head 1. In another embodiment, the spring 9 is fixed to both the first cam 3' and the second cam 3'', for example, mounted on the pivot 4 instead of the first cam 3'. The clamping device may include as many springs 9 as cams 3 or as many springs 9 as pairs of cams 3. The spring 9 in… Figure 1 and Figure 3 The attached figure shows the attachment hole 3z, which is designed to attach the end of the spring 9.

[0070] By biasing one or more cams 3 to the extended position, spring 9 biases trigger 7 to the first trigger position. Spring 9 is configured such that the extended position and the first trigger position are the rest positions of the clamping device, i.e., there is no external load.

[0071] The cam clamping device includes at least one rod 6 extending from the head 1 along the direction of the annular end 2 (i.e., along the first direction XX). Figures 1 to 10 In the illustrated embodiment, the cam clamping device includes a single rod 6 that extends longitudinally along a first direction XX against a stop formed by a head 1 and defines a through hole at an annular end 2.

[0072] It is particularly advantageous that the cam or multiple cams 3 are made of metallic material, preferably aluminum alloy or steel.

[0073] Compared to wire elements made of metal, it is particularly advantageous to use a textile wire element 8 to perform a mechanical connection between one or more cams 3 and trigger 7. However, it is also important that the clamping device can effectively attach the textile wire element 8 to the cam 3, that is, to fix a portion of the textile wire element 8 statically to a portion of the cam 3. This attachment must resist the forces present between the trigger 7 and the cam 3. This precaution allows the movement of the trigger 7 to the annular end 2 to effectively pivot the cam 3 to the retracted position. Furthermore, it is important that this attachment of the end of the textile wire element 8 does not result in a large volume, as this complicates the use of the latter in clamping devices of small size. Preferably, the fixed attachment configuration between the end of the textile wire element 8 and the cam 3 also enables the adjustment of the length of the textile wire element 8 to better accommodate the actual length of the textile wire element 8 and the separation distance between the resting position of the trigger 7 and the cam 3.

[0074] When the latter is formed, the textile element 8 is manufactured to the target length. However, due to manufacturing uncertainties, the effective length may be slightly longer or shorter than the target length. This has the effect of shifting the position of the trigger 7 relative to the head 1 and thus changing the operation of the clamping device. If the textile element 8 is too short, it is impossible to reach the maximum extension position of the cam 3. If the textile element is too long, full retraction of the cam may not be possible, or the excess textile element 8 may interfere with the movement of the cam 3 or must be cut off. Therefore, it is advantageous to provide a length-compensating feature when the textile element 8 is attached to the cam 3.

[0075] The inventors observed that the fact that the textile thread element 8 passes through the holes and / or grooves arranged in the cam 3 multiple times enables the generation of large friction between the textile thread element 8 and the cam 3. This friction enhances the attachment of the textile thread element 8 to the cam 3 and the movement of the cam 3 as the trigger 7 moves toward the annular end 2.

[0076] To ensure effective attachment of one end of the textile thread element 8 to the cam 3, the cam 3 defines at least a first hole 3a and a second hole 3b, both of which are through holes. These holes connect a first side of the cam 3 to a second side of the cam 3. The first side is opposite to the second side in a second direction YY corresponding to the rotation axis of one or more cams 3. The strands of the textile thread element 8 pass through the first hole 3a and then through the second hole 3b. The first hole 3a is different from the second hole 3b, and the two holes are separated by a strip of material. In other words, the two holes are not continuous.

[0077] To ensure effective attachment of one end of the textile thread element 8 to the 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 connecting the first side and the second side. The third hole 3c may be adjacent to one of the first hole 3a or the second hole 3b, or the third hole 3c may be spaced apart from the first two holes. The groove 3d may be formed on the surface of the first side or the second side. The groove 3d has at least one portion with a width greater than or equal to the width of the textile thread element 8. The textile thread element 8 is embedded in the groove 3d. Advantageously, the textile thread element 8 enters the first hole 3a via the second side in a direction on the first side, and advantageously, the groove 3d is formed in the first side. The textile thread element 8 enters the first hole 3a via the second side in a path following the longitudinal direction of the textile thread element 8 away from the trigger 7.

[0078] In other words, the end portion of the textile thread element 8 passes through the third hole 3c connecting the first side and the second side and / or weds into the groove 3d arranged in the first side or the second side. The end portion of the textile thread element 8 is arranged behind the second hole 3b in the longitudinal direction of the textile thread element 8 away from the trigger 7.

[0079] exist Figures 1 to 12c In the specific embodiment shown, cam 3 defines a first hole 3a, a second hole 3b, and a third hole 3c. A textile thread element 8 passes through the first hole 3a, the second hole 3b, and the third hole 3c. The textile thread element 8 passes through the first hole 3a, the second hole 3b, and the third hole 3c successively in a longitudinal direction away from the trigger 7. The longitudinal direction is the direction connecting the two opposite ends of the textile thread element 8. For example, the two ends are attached to two different cams 3.

[0080] like Figure 1 , Figure 2 , Figure 4 , Figure 6a , Figure 6b , Figure 6c , Figure 7 , Figure 8 , Figure 10 , Figure 12a , Figure 12b and Figure 12c As shown, the textile thread element 8 extends from the first side to the second side through the hole, and vice versa. The change of direction means that the end of the textile thread element 8 contacts the hole to change direction, which causes friction. Multiple frictions help ensure the attachment of the textile thread element 8. If necessary, at least a fourth hole can be envisioned to increase friction.

[0081] The cross-sections of the first hole 3a, the second hole 3b, and the third hole 3c may be the same or different. The cross-sections are preferably slightly larger than or equal to the cross-section of the textile thread element 8 to allow the textile thread element 8 to pass through easily when manufacturing the clamping device or when replacing the textile thread element 8.

[0082] In a preferred embodiment, the third hole 3c is a through hole arranged in a corner sector defined by a line connecting the rotation axis of the cam 3 and the center of the first hole 3a, and by a line connecting the rotation axis of the cam 3 and the center of the second hole 3b. Figure 5a , Figure 5c , Figure 11a and Figure 11c This is observed along the rotation axis of the cam 3. The center of the first hole 3a and the center of the second hole 3b refer to the center of the circle when the holes are circular, or the center of the first hole 3a and the center of the second hole 3b refer to the center of gravity of the shape defined by the holes. With this arrangement, a portion of the textile element 8 points in the opposite direction to the direction taken by the preceding portion in the longitudinal direction of the textile element 8. This direction is observed along the textile element 8 from the trigger 7 to the end of the textile element 8.

[0083] Advantageous and as Figure 4 , Figure 6a , Figure 6b , Figure 6c , Figure 10 , Figure 12a , Figure 12b and Figure 12c As shown, the textile thread element 8 forms a ring around the cam 3. A first strand 8a of the textile thread element 8 is wedged into one surface of the cam 3 via a second strand 8b. The first strand 8a is further away from the portion of the textile thread element 8 connected to the trigger 7 in the longitudinal direction than the second strand 8b. When the trigger 7 moves toward the annular end 2, the second strand 8b applies a force to the first strand 8a to press it against the surface of the cam 3. The force applied by the second strand 8b prevents movement of the first strand 8a, thereby ensuring that the textile thread element 8 is securely attached to the cam 3. The first strand 8a of the textile thread element 8 is fixedly assembled to the cam 3.

[0084] More generally, the ascending strand weds into the descending strand against the side of cam 3. The greater the force applied by trigger 7, the more firmly the ascending strand weds into the descending strand against the cam, and the better secured it. The ascending portion is the part closest to trigger 7 in the longitudinal direction of the yarn element 8. This configuration can be used with three, four, or more holes passing through cam 3.

[0085] Advantageously, the first strand 8a is the end strand of the textile element 8, which wedges into the surface of the cam 3 via the second strand 8b of the textile element 8. The end strand is the furthest part of the textile element 8 from which it connects to the trigger 7.

[0086] The fastener can be installed without adhesive or knots and provides resistance to the force applied to the cam 3 by the trigger 7 against the stress of the spring 9. The thickness of the fastener is substantially twice the thickness of the textile element 8. Advantageously, a portion of the cam 3 is thinned to form a thinned region 3e, such that one or more strands of the textile element 8 do not form a protruding area extending beyond the cam size, which is the volume occupied by the cam 3 when moving between the extended and retracted positions without the textile element 8.

[0087] exist Figure 4 , Figure 5a and Figure 5c In the advantageous embodiment shown, the first hole 3a, the second hole 3b, and the third hole 3c are neatly arranged through holes. When a force is applied to the textile yarn element 8 in the direction of the trigger 7, the first strand 8a and the second strand 8b seek to move in different directions. This arrangement of the two strands tends to complicate the movement of the first strand 8a and the second strand 8b.

[0088] exist Figure 10 , Figure 12a and Figure 12c In the alternative embodiment shown, the first hole 3a, the second hole 3b, and the third hole 3c are unaligned through holes, 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 element 8 connecting the first hole 3a and the second hole 3b overlaps with the third hole 3c when viewed along the second direction YY. The first strand 8a weds into the wall of the cam 3 through the second strand 8b, as in the previous embodiment.

[0089] The above-described configuration is particularly advantageous because it allows the textile thread element 8 to be fixed to the cam 3 and provides a degree of freedom in adjusting the length of the textile thread element 8. Preferably, mounting the end portion of the textile thread element 8 in the recess of the cam 3 ensures that excess textile thread element 8 does not impede the movement of the cam 3 relative to each other.

[0090] As an alternative to or supplement to the third hole 3c, the cam 3 may define a groove 3d on one side. Advantageously, along the longitudinal direction of the textile element 8 away from the trigger 7, the groove 3d is located after the first hole 3a and the second hole 3b. The groove 3d allows a portion of the textile element 8 to be wedged in, preferably the end portion of the textile element 8. Preferably, the groove 3d can wed in a greater or lesser amount of the textile element 8, thereby enabling adjustment of the effective length of the textile element 8.

[0091] In the preferred embodiment shown in the various figures, the groove 3d is arranged between the second hole 3b and the third hole 3c. Besides allowing the first strand 8a to wed into the wall of the cam 3 via the second strand 8b, the first strand 8a is mounted in the groove 3d, thus enabling further wedging of the first strand 8a. The textile element 8 can then withstand higher stress.

[0092] Advantageously, the groove 3d connects the first hole 3a and the third hole 3c, such as Figure 5a and Figure 11a As shown. This construction allows for a better balance between the fixation of the textile thread element 8, the size of the cam 3, and the mechanical strength of the cam 3.

[0093] exist Figure 5b , Figure 6b , Figure 11b and Figure 12b In the specific embodiment shown, the textile thread element 8 successively passes through the first hole 3a and the second hole 3b in the longitudinal direction away from the trigger 7 before wedging into the groove 3d and / or passing through the third hole 3c. The continuous passage of the textile thread element 8 through multiple holes causes a change in the orientation of the textile thread element 8, and thus a change in the friction between the textile thread element 8 and the cam 3. The textile thread element 8 presses against both ends of the first hole 3a, the second hole 3b, and the third hole 3c (if present). Each press generates friction, which makes the sliding of the textile thread element 8 relative to the cam 3 more complex.

[0094] To achieve high friction between the textile thread 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 defines a sharp edge with the wall defining a first or second side of the cam 3. The angle between the sidewall of the hole and the wall of the side surface is preferably between 75° and 105°, more preferably equal to 90°.

[0095] Advantageously, the first hole 3a has a second end with a pressing region having an edge that is less sharp than at least one other edge pressed thereon by the textile element 8. In other words, the edge of the pressing region at the second end is less sharp than the edge of the pressing region at the first end of the first hole 3a, or less sharp than the edge of any one of the pressing regions of the second hole 3b or the third hole 3c (if present). Preferably, the first hole 3a has a second end with an edge of a pressing region that is less sharp than the edge of the other pressing region of the first hole 3a and the edge of the second hole 3b. Even more preferably, the first hole 3a has a second end with an edge that is less sharp than all other edges pressed thereon by the textile element 8. Less sharp means an edge whose angle between the sidewall of the hole and the side edge of the cam defining the sidewall is further away from 90° than the contrasting edge. It should also be understood that the pressing region has a greater number of edges, such as two, three, or four edges.

[0096] Advantageously, the first hole 3a has a second end, the pressing area of ​​which has a rounded edge, i.e., without a sharp edge. When the edge is rounded, it is advantageous that the edge defines a radius greater than half the thickness of the textile element 8, preferably greater than twice the thickness of the textile element 8. The pressing area with a rounded edge corresponds to a pressing area with an infinite number of edges.

[0097] The inventors observed that the stress applied to the textile element 8 by the trigger 7 in association with the pivoting of the cam 3 has a damaging effect on the textile element 8 in the friction area. This behavior was not observed for other pressing points with smaller movements. The lifespan of the textile element 8 can be improved by introducing a greater number of edges, and preferably rounded portions, thus allowing for greater choice in accessible materials and available cross-sections. This is particularly advantageous for reducing the cross-section of the textile element 8, which is preferred for small-sized clamping devices as it reduces the cross-section of holes, grooves, and thinned areas.

[0098] exist Figures 1 to 12c In the preferred embodiment shown, the first hole 3a and the second hole 3b lead to a thinning region of at least one cam 3. The thinning region represents a reduction in thickness at least equal to the thickness of the strands of the textile element 8. The thinning region on the first side represents a thinning of a more prominent area relative to the first side. The thinning region on the second side represents a thinning of a more prominent area relative to the second side. The prominent features are viewed along the pivot axis of the cam 3. The prominent region is the area furthest from the midplane of the cam and perpendicular to the second direction YY. Using thinning regions, preferably thinning on each side, allows the cams to move toward each other without being obstructed by the textile elements 8 wound between the opposite sides.

[0099] As described above, preferably, the cross-section of the textile thread element 8, from one end to the other in the longitudinal direction of the textile thread element 8, is smaller than the cross-section of the first hole 3a and the second hole 3b. The cross-section is observed without any stress (especially the longitudinal tensile stress of the textile thread element 8) to facilitate installation.

[0100] In a preferred embodiment, the textile thread element 8 is secured to the cam 3 solely by wedging 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 knot formation, the position and volume of which are difficult to control, leading to uncertainty in the effective length between the trigger 7 and the cam 3. This configuration also prevents the formation of adhesion points, the quality of which may vary over time when the clamping device is designed for outdoor use in various weather conditions.

[0101] In a particular embodiment, the cam clamping device has at least two cams 3. A first cam 3' and a second cam 3'" are rotatably mounted, and the textile thread element 8 has a first end fixed to the first cam 3' and an opposing second end fixed to the second cam 3'". The two cams define holes and / or grooves, as previously described. Both ends are fixed according to one of the aforementioned embodiments.

[0102] In order to manufacture the cam clamping device, both the textile thread element 8 and the cam clamping device presented according to any of the above configurations are provided.

[0103] The textile thread element 8 is connected to the trigger 7, and the end of the strand of the textile thread element 8 is inserted into the first hole 3a and 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 then is embedded in the groove 3d.

[0104] Preferably, the third hole 3c is located in the angular sector defined by the first hole 3a, the rotation axis of the cam 3, and the second hole 3b. The textile thread element 8 passing through the three holes enables the formation of a loop, the end of which is wedged into another thread.

[0105] In order to adjust the textile thread element 8 to the correct length, it is advantageous to pass the textile thread element 8 through the hole and possibly through one or more grooves, and then place the end of the strand in the groove designed to receive that part of the strand or between the last two holes for fixing the textile thread element 8, and then pull the trigger 7 to wedge the textile thread element 8, thereby achieving fixation with the cam 3.

[0106] Preferably, one end of the textile thread element 8 is fixed to the first cam 3' before the other end is fixed by the method described above.

Claims

1. Cam clamping device, comprising: - a head (1); - at least one cam (3) mounted in a movable manner pivoting about at least one pivot axis (4) fixed to the head (1), the at least one cam (3) being movable between a retracted position and an extended position, the at least one cam (3) defining at least a first hole (3a) and a second hole (3b) passing 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; - a ring-shaped end (2) mechanically coupled to the head (1); - a stem (6) extending from the head (1) to the ring-shaped end (2); - a trigger (7) mounted movable between a first trigger position and a second trigger position, - a textile thread element (8) having a first end fixedly mounted with the at least one cam (3), the textile thread element (8) mechanically connecting the trigger (7) to the at least one cam (3), the textile thread element (8) functionally connecting the trigger (7) to the at least one cam (3), the at least one cam (3) being in the retracted position when the trigger (7) is in the second trigger position; characterized in that the textile thread element (8) passes through the first hole (3a) and the second hole (3b) to introduce friction between the textile thread element (8) and the at least one cam (3), and in that an end portion of the textile thread element (8) passes through a third hole (3c) connecting the first side and the second side and / or is wedged in a groove (3d) arranged in the first side or the second side, the end portion of the textile thread element (8) being arranged behind the second hole (3b) in a longitudinal direction of the textile thread element (8) away from the trigger (7).

2. The cam clamping device according to claim 1, characterized in that The at least one cam (3) defines the third hole (3c), and wherein a lower strand of the textile thread element (8) is wedged against a face of the at least one cam (3) by an upper strand of the textile thread element (8), the lower strand being further away from the trigger (7) than the upper strand in a longitudinal direction of the textile thread element (8).

3. Cam clamping device according to any one of claims 1 and 2, characterized in that The at least one cam (3) defines the at least one groove (3d), and wherein an end of the textile thread element (8) is embedded in the at least one groove (3d).

4. The cam clamping device of claim 3, wherein The at least one groove (3d) connects the first hole (3a) and the third hole (3c).

5. The cam clamping device of claim 4, wherein The at least one cam (3) defines the third hole (3c), and wherein a descending strand of the textile thread element (8) is wedged against a face of the at least one cam (3) by an ascending strand of the textile thread element (8), the descending strand being further away from the trigger (7) than the ascending strand in a longitudinal direction of the textile thread element (8), and the descending strand wedges into the at least one groove (3d).

6. The cam clamping device according to any one of claims 1 and 2, characterized in that, The textile thread element (8) successively passes the first hole (3a) and the second hole (3b) in a longitudinal direction of the textile thread 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 thread element (8) enters the first hole (3a) from the second side, the second end forming a second pressing area of the textile thread 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. The cam clamping device of 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 a circular arc with a radius of curvature at least equal to half the thickness of the textile thread element (8).

8. The cam clamping device of claim 6, wherein A side wall of the first hole (3a) defines a sharp edge with a second face of the at least one cam (3), and / or a side wall of the second hole (3b) defines a sharp edge with a first face or a second face of the at least one cam (3).

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

10. The cam clamping device according to any one of claims 1 and 2, characterized in that, The first hole (3a) and the second hole (3b) open into a thinned region (3e) or a recess (3f) of the at least one cam (3), the thinned region (3e) or the recess (3f) representing a thinning at least equal to the thickness of a strand of the textile thread element (8).

11. The cam clamping device according to any one of claims 1 and 2, characterized in that, A cross section of the textile thread element (8) is smaller than a cross section of the first hole (3a) and the second hole (3b) from one end to the other end of the textile thread element (8) and in a longitudinal direction of the textile thread element (8).

12. The cam clamping device according to any one of claims 1 and 2, characterized in that, The textile thread element (8) is fixed to the at least one cam (3) only by wedging 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).

13. The cam clamping device according to any one of claims 1 and 2, characterized in that, The at least one cam (3) has a first cam (3') and a second cam (3"), and wherein the textile thread element (8) has a first end fixed to the first cam (3') and an opposite second end fixed to the second cam (3").

Images