5, and the rigidity is then procured by an additional element such as the rod. The same is the case when the wire element 5 is a metal cable of small cross-section. To increase the rigidity perpendicularly to the first direction XX, the camming clamping device comprises at least one rod 8 that extends in the first direction XX from the head 1 up to the annular end 2. The at least one rod 8 is fixed on the one hand to the head 1 and it partially or totally defines the annular end 2. Preferably, a first end of the rod 8 can come up against the stop formed by the head 1. The force applied by the wire element presses one end of the head of the rod 8 against the head 1.

In the embodiments illustrated in FIGS. 1 to 13, the camming clamping device comprises a single rod 8 that extends longitudinally in the first direction XX.

The rod 8 is more rigid than the wire element 5 perpendicularly to the direction XX which enables the camming clamping device to be secured by means of the rod 8 and the clamping device to be placed precisely in a crack in comparison with an equivalent device without the rod 8. It is advantageous for the trigger 7 to be installed slidingly along the rod 8 and for the rod 8 to separate the wire element 5 and the trigger 7. To protect the wire element, it is advantageous for the wire element 5 to pass through the rod 8.

In order to ensure a good rigidity perpendicularly to the first direction XX, it is advantageous to apply a tensile stress on the wire element from its attachment point to the head up to the annular end 2. To apply a tensile stress on the wire element 5, the rod 8 is used which then receives a compressive force in the first direction XX applied by the wire element.

Manufacture of the wire element results in a disparity around a target length. The same is the case for manufacture of the rod. In order to apply a sufficient force on the wire element, it is preferable to adjust the lengths of the wire element and of the rod. It is therefore particularly advantageous to use a rod the length of which is adjustable in the first direction XX so as to apply a tensile stress on the wire element 5 in the first direction XX. Whereas the document U.S. Pat. No. 10,143,892 proposes using springs which will be stressed when the wire element is attached to the head, it is proposed to form a rod 8 in two parts with a clamp that freezes the length of the rod 8.

In a particular embodiment, the rod 8 has a variable length. The use of a variable length enables the length of the rod 8 to be adjusted to the effective length of the wire element 5 between the head 1 and the annular end 2. To obtain a rod 8 of variable length, it is advantageous to have a rod made in at least two parts, with a first part 8a fitted movable with respect to a second part 8b in the first direction XX. By moving the first part 8a with respect to the second part 8b, the length of the rod 8 can be adjusted. A tractive force can be applied on the wire element 5 in the first direction XX. This enables the rod 8 to be stressed in compression by means of the wire element 5 thereby enhancing the rigidity of the rod 8. The length is measured in the first direction XX.

Depending on the embodiments, adjustment of the length of the rod 8 can be continuous or by increments. Once the length has been defined, a clamp 12 enables the position of the second part 8b to be fixed with respect to the first part 8a. As the wire element 5 is more rigid than the rod 8 in the first direction XX, the wire element 5 will oppose the increase of the length of the rod 8 which will be stressed compressively. Compression of the rod 8 will make it possible to have a rod 8 that is more rigid perpendicularly to first direction YY thereby improving precise installation of the clamping device in the crack.

In a first clamp position, the length of the rod 8 can vary which avoids stressing the wire element 5 or an excessive stress being applied on the wire element. This makes securing of the wire element 5 with the head 1 easier to perform. In a second clamp position, the length of the rod 8 is freezed. The length of the rod 8 defines the degree of force applied on the wire element 5.

In other words, the camming clamping device comprises an adjustment device of the length of the rod 8 configured to separate the head 1 and the annular end 2 beyond at least a threshold distance and to apply a tractive force on the wire element 5 in the first direction XX.

The rod 8 has a proximal part 8a that comes up against the stop formed by the head 1 or is fixed to the head. The rod 8 also has a distal part 8b forming all or part of the annular end 2 and separated from the head 1 by the proximal part 8a. The distal part 8b is arranged movable with respect to the proximal part 8a to vary the length of the rod 8 and apply the tractive force on the wire element 5 in the first direction XX. This solution is simple to implement and enables the length of the rod 8 to be adjusted to the length of the wire element 5.

It is advantageous for proximal part 8 and the distal part 8b to comprise or be formed by a tube through which the wire element 5 passes. The distal part 8b protects the wire element 5 against wear in all or part of the annular end 2.

In advantageous manner, the proximal part 8a defines at least one cavity designed to receive one end of the distal part 8b. When the clamp 12 is in the first clamp position, the end of the distal part 8b is installed fixed in the cavity. When the clamp 12 is in the second clamp position, the end of the distal part 8b can slide in the cavity.

In preferential manner illustrated in FIGS. 1 to 13, the tubular part of the distal part 8b of the rod 8 is able to deform elastically perpendicularly to the first direction XX in order to better match its shape with the shape of the wire element 5 under a tensile force. In preferential manner, the wire element 5 is in continuous contact with the tubular part of the distal part 8b so that the strains applied in the annular end 2 are taken up by the wire element 5. When it deforms, the tubular part of the distal part 8b applies a tensile force on the wire element 5 and a compressive force on the proximal part 8a. Deformation of the distal part 8b increases the rigidity perpendicularly to the first direction XX.

Advantageously, one of the proximal part 8a and the distal part 8b has a crenellated part 8c and the other of the proximal part 8a and the distal part 8b has at least one tooth configured to be inserted in at least one slot of the slots of the crenellated part 8c. The slots are arranged consecutively along the first direction XX. The use of a plurality of slots operating in conjunction with at least one tooth and preferably with a plurality of teeth enables several distinct lengths of the rod 8 to be defined. It is then easier to adjust the length of the rod 8 to the length of the wire element 5 and to maintain this length. Such an embodiment is illustrated in FIGS. 7 and 8 and can be applied to the other embodiments.

In the embodiments illustrated in FIGS. 1 to 13, the camming clamping device comprises a clamp 12 that is configured to block the position of the distal part 8b with respect to the proximal part 8a. The clamp 12 is fitted removable with respect to the rod 8. The clamp 12 can comprise a screw 9 or any other securing means to secure the clamp 12 to the rod 8.

In the first clamp position which is a blocking position, the clamp 12 reduces the available cross-section for sliding between the first part 8a and second part 8b. The position of the distal part 8b is fixed with respect to the proximal part 8a. In the second clamp position which is a sliding position, the clamp 12 moves away having the effect of increasing the available cross-section and of allowing the length of the rod 8 to be adjusted. FIGS. 3 and 4 show a clamp 12 one end of which is in the form of a wedge, the depth of depression of the clamp 12 in the rod 8 defining the degree of narrowing of the cavity designed to receive the end of the distal part 8b.

It is particularly advantageous to install the clamp 12 in the portion of the rod 8 that defines the annular end 2 rather than in the tubular part that connects the head to the annular end 2. This makes it possible to have more available space to avoid the formation of a favourable friction area with the wire element 5. This enables the tubular part of the distal part 8b to better adapt its shape according to the applied stresses. This also makes installation of the rod 8 easier to perform.

For example, in the first clamp position, the clamp 12 wedges at least one termination or both terminations of the distal part 8b against the proximal part 8a as illustrated in FIGS. 3, 4, 7, 8, 10 and 13. When the clamp 12 only wedges one termination of the distal part 8b, the other termination is up against the stop formed by the proximal part 8a.

In the embodiment illustrated in FIGS. 1 to 4, proximal part 8a defines two cavities designed to receive the two ends of the distal part 8b. In a first clamp position, the clamp 12 blocks the position of the distal part 8b with respect to the 25 proximal part 8a. In a second clamp position, the clamp 12 allows movement of the position of the distal part 8b with respect to the proximal part 8a in the first direction XX. Such an assembly facilitates installation of the tubular part in the cavities followed by application of a tensile force on the tubular part and on the wire element to stress the rest of the rod 8 in compression.

FIGS. 1 to 4 illustrate an embodiment where the clamp 12 is fixed in a hole of the proximal part and reduces the cross-section available for the distal part 8b. The terminations of the distal part 8b deform and are wedged against the proximal part 8a thereby fixing the position of the distal part 8b with respect to the proximal part 8a.

FIGS. 5 to 8 illustrate an embodiment where the clamp 12 defines at least one tooth or one crenellated part 8c and the distal part defines a crenellated part or at least one tooth. Once the clamp 12 has been fixed to the proximal part 8a, the crenellated part and the at least one tooth fix the position of the distal part 8b. The clamp 12 defines a wall of the cavity designed to receive the end of the distal part 8b.

FIGS. 9 to 11 illustrate another embodiment with a proximal part 8a that is a telescopic proximal part. The clamp 12 is fixed to proximal part 8a and wedges distal part 8b to fix the position of distal part 8b. Assembly of proximal part 8a in two parts makes installation of the rod 8 easier to perform. The proximal part 8a has a first portion 8d and a second portion 8e assembled movable with respect to the first portion 8d in the first direction XX. In the position illustrated in FIG. 9, the proximal part 8a is in an extended position. In the position illustrated in FIG. 10, the proximal part 8a is in a retracted position. The configuration of the proximal part 8a between the extended position and the retracted position is independent from the position of the at least one cam 3 and from the position of the trigger 7. The proximal part 8a can have its own clamp to fix the position of the second portion 8e with respect to the position of the first portion 8d. For example, the first portion 8d and the second portion 8e define a set of grooves and teeth that only allow the length of the rod 8 to be increased.

In preferential manner, once the proximal part 8a has been placed in the extended position, it is not possible to return to the retracted position or the force required to reach the retracted position is greater than the force applied between the wire element 5 and the rod 8 to stress the rod 8 in compression. The use of a proximal part 8a in at least two portions, preferably with a telescopic assembly, facilitates installation of the rod 8 and tensioning of the wire element 5. Preferably, in the retracted position, the proximal part 8a and the distal part 8b are incapable of stretching the wire element 5. The clamp 12 enables a more precise adjustment of the length of the rod 8 to be achieved.

In yet another embodiment a particular configuration of which is illustrated in FIGS. 12 and 13, distal part 8b and proximal part 8a are assembled movable with respect to one another to define several stable positions of the distal part 8b with respect to the proximal part 8a. In the particular configuration illustrated, distal part 8b and proximal part 8a define a groove and tab device that enables the length of the rod 8 to be defined.

The distal part 8b is preferentially engineered in two parts with a first portion 8d and a second portion 8e. The two portions are not configured to adjust the length of the rod 8 by a relative movement between the first portion 8d and the second portion 8e. The clamp 12 reduces the available cross-section for the second portion 8e to pass which has the effect of wedging the second portion