Clamping system consisting of collar and pre-mounted clamp

Abstract

A clamping system for connecting first and second pipes (2, 4) having facing end portions with protruding clamping surfaces (18, 20). The system comprises a collar (10) having a strip (12) that can be clamped around the clamping surfaces. The strip has first and second sides between which an internal recess (14) is defined that can receive the clamping surfaces of the pipes. The collar carries an outer retaining clip (30) comprising a retaining section (32A) on one side of the first side and first and second link returners (34A, 38A) linking the retaining section to first and second retaining members (36A, 40A) on one side of the second side (382B), respectively. The collar is axially retained between the retaining section on one hand and the first and second retaining members on the other hand. The retaining section (32A) is elastically deformable to allow insertion of the end portions of the pipes and to retain them pre-mounted in the collar.

Description

Background Art

[0001] The invention relates to a clamping system for connecting a first and a second tube, the facing ends of which have clamping surfaces projecting relative to the cylindrical outer surfaces of the tubes.

[0002] Clamping systems of this type are known, for example, from European patents EP 1 451 498 and EP 2 598 785 .

[0003] In such a system, the collar comprises a band capable of clamping around the clamping surfaces of the tubes. The band has side faces defining an internal groove between the side faces, into which the clamping surfaces of the tubes are disposed to achieve clamping. Thus, the tubes are held clamped relative to one another. For example, as indicated in the aforementioned patent, it may be useful to pre-install the clamping system on at least one tube end prior to operating the clamping operation.

[0004] EP 1 451 498 proposes a system that allows pre-installation relative to the tube using pre-installed legs carried by a strip, via washers themselves carried by the strip. This system is satisfactory, but, by definition, it requires the presence of washers that can be of relatively complex shape, which affects both production and installation costs.

[0005] To allow pre-installation on two tubes, EP 2 598 785 also uses a washer carried by a collar and comprising first and second pre-installation legs that cooperate with the first and second tubes, respectively, to hold the washer, and thus the entire clamping system, relative to the respective clamping surfaces of the tubes before clamping. This system is also satisfactory, but it also requires the presence of a relatively complex shape for the washer. This shape is further complicated by the need to produce two types of legs, extending on either side of the washer to hook onto each of the two tubes. In particular, the design and dimensions of the legs, which enable them to hook from the washer to the farthest tube in the pre-installed state, make it difficult for these legs to have both the mechanical resistance required to maintain a good hold on the tube and the flexibility to flex elastically during the insertion of the tube into the collar.

[0006] Other clamping systems are also known, comprising a collar and a washer carried by the collar, the washer having an inner leg capable of gripping inside one of the tubes, thereby pre-installing the clamping system at the end of that tube. It would also be useful to complete the system so as to also allow pre-installation relative to other tubes. For this purpose, it is possible to use the long leg proposed in EP 2 598 785, but, particularly for collars of large diameter, another solution is needed that does not substantially suffer from the aforementioned disadvantages.

[0007] US20140217728 discloses a clamping system comprising a collar and a pre-positioning fastener comprising a strap portion capable of surrounding a tube, the fastener being secured to the collar by legs. Summary of the Invention

[0008] Generally, there is a need for a clamping system for connecting two pipes, which comprises a collar which, in the pre-installed condition, is easily retained at the end of one of the pipes, independently of the fact that it comprises or does not comprise a clamping washer carried in the collar.

[0009] The invention thus relates to a clamping system for connecting first and second tubes, the facing ends of which present a clamping surface projecting relative to the cylindrical outer surface of said tubes, the system comprising a collar comprising a strip capable of clamping around said clamping surface, the strip having a first and a second side extending on either side of a median radial plane perpendicular to the axis of the strip and an internal groove defined between said first and second sides capable of receiving said clamping surface, the collar carrying an external retaining fixture comprising:

[0010] a holding section and an additional holding section, which are angularly spaced apart from one another and are situated on either side of the first side surface,

[0011] first and second retaining members located on either side of the second side and linked to the retaining section, and

[0012] first and second additional retaining members, which are located on the sides of the second side and are linked to the additional retaining section,

[0013] The collar is thereby held axially between the retaining section and the additional retaining section on the one hand, and between the first and second retaining members and the first and second additional retaining members on the other hand, the retaining section and the additional retaining section being elastically deformable away from the axis of the belt from a rest position in which they project towards the axis of the belt relative to the edge of the first side in the unclamped position of the belt.

[0014] Thus, the clamping system is particularly easy to implement relative to the clamping surface of the first tube. This retention uses a simple external clamp, the correct positioning of which can be easily checked. Furthermore, the clamp is compatible with the presence of a gasket inside the collar, so that the system can include such a gasket or, conversely, not have one. Furthermore, if the system includes a gasket, it may be advantageous to provide that the clamp is designed for pre-mounted retention on one of the tubes, and that the gasket is designed for pre-mounted retention on the other tube, for example using a gasket of the type described in EP 1 451 498.

[0015] The clamp is easy to install on the collar due to the elastic deformation of the holding section and the additional holding section. When the first tube is installed inside the clamping system, the holding section and the additional holding section deflect outward to allow the clamping surface of the first tube to be inserted into the collar, and then naturally return to their rest position, in which the holding section and the additional holding section cooperate with the clamping surface of the first tube and interfere with the edge of the first side surface to prevent the clamping surface of the first tube from being unintentionally separated from the collar.

[0016] Optionally, the first and second retaining members are linked to the retaining section by first and second link returners, respectively.

[0017] Optionally, the first and second additional retaining members are linked to the additional retaining section by first and second additional link returners, respectively.

[0018] Optionally, the first and second retaining members are hooked on a region of the collar, seen from the side of the first side, which region is located on the other side of the median radial plane relative to the first side.

[0019] Optionally, at least one of the first and second retaining members is hooked on the second side surface when viewed from the side of the first side surface.

[0020] Optionally, the collar has at least one lug projecting radially relative to the circumference of the strap, in particular a lug for strap gripping, and on which at least one of the first and second retaining members is hooked, seen from the side of the first side.

[0021] Optionally, at least one of the first and second retaining members forms part of a ring.

[0022] Optionally, at least one of the first and second link restorers follows the outer shape of the side surfaces.

[0023] Optionally, the retaining section and the additional retaining section are diametrically opposed.

[0024] Optionally, the second retaining member and the second additional retaining member are linked by a linking section, which is located on a side of the second side surface.

[0025] Optionally, the link section comprises a portion forming the operating lever, the portion being axially spaced apart from the second side.

[0026] Optionally, the outer retaining clamp is symmetrical with respect to a diametrical plane of the belt.

[0027] Optionally, the outer retaining clamp is formed from a wire, in particular a metal wire.

[0028] Optionally, the retaining section has a rectilinear shape in the free state, the rectilinear shape being parallel to the diameter of the band, and optionally, the additional retaining section has a rectilinear shape in the free state, the rectilinear shape being parallel to the diameter of the band.

[0029] Optionally, the outer retaining clamp includes a relative retaining section that is located on the side of the second side and is capable of elastically deforming from a static state so that the relative retaining section moves away from the axis of the belt, in which static state the retaining section protrudes toward the axis of the belt relative to the edge of the second side in a non-clamped state of the belt.

[0030] Optionally, at least one of the first and second retaining members has an extension in which the opposing retaining sections are formed.

[0031] The invention will be better understood and its advantages will appear better on reading the following detailed description of one embodiment presented by way of non-limiting example. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The clamping system according to the invention is shown in a perspective view in a pre-installed condition on the ends of pipes, said clamping system being used to connect these pipes together, as seen from the side of one of the pipes.

[0033] Figure 2 is with Figure 1 Type view, but viewed from the side of another tube.

[0034] Figure 3 is an exploded perspective view showing the different elements constituting a clamping system for connecting the ends of the aforementioned pipes together, as well as the ends of the pipes.

[0035] Figure 4 A clamp of the clamping system is shown viewed in a perspective view.

[0036] Figure 5 A clamp of a clamping system according to one variation is shown.

[0037] Figure 6 The top view shows the Figure 1 The clamping system is observed by arrow VI. DETAILED DESCRIPTION

[0038] First describe Figures 1 to 3 It can be observed that the clamping system according to the invention comprises a collar 10 of the same type as the one described in EP 1 451 498, which serves to connect the first and second tubes 2, 4 together.

[0039] In the following, the elements directed towards the axis A of the strip 12 of the collar will be referred to as “radially inner” elements, as opposed to the other elements referred to as “radially outer” elements, these being those directed away from the axis A. It is also considered that, when the tubes 2 , 4 are assembled, the axis A of the strip is also the axis of these tubes.

[0040] Furthermore, a second element will be considered to be "outside" or "axially outward" of a first element if the second element is located proximate to the first element outside of an axial cross-section occupied by the first element.

[0041] exist Figure 3 As can be better seen in the figure, the collar's strip 12 (that is, the portion of the collar wound around axis A) defines a groove 14 into which clamping surfaces (respectively, clamping surface 18 belonging to first tube 2 and clamping surface 20 belonging to second tube 4) can be inserted. This groove and these clamping surfaces have a shape such that the clamping of the collar's strip forces the ends of tubes 2 and 4 toward each other. Groove 14 is defined between a first side 13A and a second side 13B of the strip 12, which in this case define the branches of a V-shape viewed in axial section. Thus, the strip 12 advantageously has a V-shaped axial section, the ends of which point outward, while the clamping surfaces 18 and 20 have a diameter that gradually increases toward the free end facing the tubes and, for example, has a frustoconical shape. However, the strip may, for example, have a cross-section that is closer to a U-shape.

[0042] The strap 12 has ends (12A and 12B, respectively) that extend substantially radially to form load-bearing legs. These legs have holes to allow the rod 24A of the clamping screw 24 to pass through them. The head 24B of the screw is wedged relative to one of the load-bearing legs (in this case, leg 12B), while the nut 26 is retained relative to the other load-bearing leg 12A. It should be understood that rotation of the nut in the screwing direction brings the load-bearing legs closer together, thereby reducing the inner diameter of the collar, that is, allowing the strap to be clamped. Of course, other methods of clamping the strap are conceivable, such as a hooking system, as particularly described in patent application FR 3 008 160. In this case, the strap 12 has an extension forming a flap 12'A that extends between the load-bearing legs 12A and 12B. It should be understood that when the strap is clamped, the flap prevents discontinuity in the strap's bearing on the pipe clamping surface.

[0043] In this case, the end of tube 4 has an internal flared shape, with the inner perimeter of the clamping surface 20 of the tube forming the flared shape. On the other hand, the free end of first tube 2 is a convex end that extends beyond clamping surface 18 and has an outer perimeter 23 whose diameter gradually decreases toward the termination of the free end. Therefore, the thus formed end 23 can be inserted into the flared shape formed at the end of tube 4 in a substantially form-fitting manner.

[0044] The clamping system comprises an outer holding fixture 30, e.g. Figure 1 and Figure 2 It is particularly observed that the outer retaining fixture is arranged outside the collar and serves to retain the tube 2 relative to the clamping system in the pre-installed situation. Figure 1 It is particularly observed that the outer retaining clamp 30 includes a retaining section 32A located on the side of the first side 13A of the belt. The outer retaining clamp also includes a first link resetter 34 and a second link resetter 38A, the first link resetter linking the retaining section 32A to a first retaining member 36A located on the side of the second side 13B, and the second link resetter linking the retaining section 32A to a second retaining member 40A also located on the side of the second side 13B. It should be understood that, in particular by comparing Figure 1 and Figure 2 The collar 10 is axially retained between the retaining section 32A on the one hand and the first and second retaining members 36A and 40A on the other hand. These first and second retaining members are spaced apart from one another along the circumference of the strip so that on one side of the second side 13B they retain the strip in two angularly spaced regions.

[0045] In addition, Figure 1 As can be seen in the figure, retaining section 32A protrudes inwardly relative to edge 13'A of first side 13A. In fact, this retaining section is closer to the axis A of the strip than this edge, which allows it to be retained behind clamping surface 18 of first tube 2 when the clamping surface is inserted inside the collar. Here, the term "behind" should be understood as meaning opposite to the direction of engagement of the clamping surface in the collar, which is the forward direction. In fact, to allow insertion, retaining section 32A can be elastically flexed outwardly, as indicated by arrow F, for example. It should be understood that in its natural rest position, this retaining section is actually positioned closer to axis A than edge 13'A of side 13A of the strip.

[0046] In this case, the retaining fixture 30 also has an additional retaining section 32B, which is angularly spaced from the retaining section 32A and is also located on the first side 13A of the strap. The retaining fixture 30 also includes a first additional retaining member 36B, which is located on the second side 13B and linked to the additional retaining section 32B by a first additional link restorer 34B, and a second additional retaining member 40B, which is also located on the second side 13B and linked to the additional retaining section 32B by a second additional link restorer 38B. These first and second additional retaining members are spaced apart from one another along the circumference of the strap.

[0047] The additional retaining section 32B is angularly spaced from the retaining section 32A. Similar to the retaining section 32A, the additional retaining section 32B, in the unclamped state of the strip, projects relative to the edge 13 'A of the first side 13A towards the axis of the collar and is elastically deformable to move away from the axis of the collar and allow the gripping surface of the first tube to be inserted. Thus, the retaining section 32A and the additional retaining section 32B retain the gripping surface of the first tube 2 in two areas angularly spaced from the gripping surface and, in the pre-installed state, thus promote alignment of the axis of the tube with the axis of the strip and avoid corresponding angular play between the first tube and the collar.

[0048] In fact, in the example shown, the retaining section 32A and the additional retaining section 32B are diametrically opposed, that is to say, when the clamp is mounted on the collar, the retaining sections are situated in the diametric plane PD (see Figure 2 and Figure 6 :Through axis A and perpendicular to Figure 6 The clamp 30 is held symmetrically with respect to a diametrical plane. This plane is in particular a diametrical plane defined by the axis A and situated at equal distances from the bearing legs 12A and 12B of the collar.

[0049] In this case, the two retaining sections are similar and we will now focus more precisely on one of the retaining sections, for example the retaining section 32A. It can be observed that the retaining section is in this case rectilinear and forms a retaining strip which is oriented transversely to the axis A. However, the retaining section can have a different shape and in particular be naturally curved in such a direction that it tries to get closer to the axis A. When the outer retaining clamp 30 is mounted on the collar, the retaining section 32A is thus pressed against the edge 13'A of the first side 13A of the strip outside the strip. The linking resetters 34A and 38A link the retaining section to the first and second retaining members 36A, 40A. In fact, these first and second retaining members are relatively located on the sides of the second side 13B of the strip. Therefore, the first and second retaining members are relatively located relative to the retaining section, in the middle radial plane P of the strip (see Figure 6 ) extends on the other side.

[0050] It can be provided that the first and second holding members are hooked to the edge 13 'B of the second side face 13B. In the example shown, this is the case for the second holding member 40A, Figure 2 The second retaining member is shown extending radially inwardly beyond an edge 13 ′B of the second side 13B.

[0051] However, with respect to the first retaining member 36A, in this case the load-bearing legs 12A and 12B of the collar are utilized. Thus, for example Figure 2 As can be seen in FIG, the first retaining member 36A is hooked onto the load-bearing leg 12A. Typically, the load-bearing leg 12A forms a lug that projects radially relative to the circumference of the strap. In this case, the lug is a load-bearing leg that, in a sense, cooperates with the clamping screw to clamp the collar. For example, as described in one of the embodiments of application FR 3 008 160, the lug can be a radially projecting lug that serves for clamping, for example, by hooking it.

[0052] In this case, the retaining member 36A forms part of a loop of the clamp, through which the base of the carrying leg 12A passes. In this case, the loop is formed in the end region of the clamp, the retaining member 36A extending with a terminal portion 37A which forms the free end of the clamp (see Figure 3 and Figure 4 ). The link restorer 34A, the first retaining member 36A and the terminal portion 37A together form a loop which surrounds the base of the load-bearing leg 12A. In this case, the loop has a U-shape.

[0053] This construction is similar for the additional retaining section 32B, and it can be observed that the additional link resetter 34B, the first additional retaining member 36B, and the terminal portion 37B together form a loop that surrounds the base of the load-bearing leg 12B of the strap. In this case, the clamp is of the type that is open between the first retaining member 36A and the first additional retaining member 36B. In fact, as shown in the figure, the terminal portions 37A and 37B terminate in separate free ends. As long as the loop surrounds the load-bearing legs 12A and 12B, it will be understood that the fact that the clamp does not have a link section between these two loops improves the ability of the clamp to access the load-bearing legs during the clamping of the collar. However, it is preferably conceivable that the clamp is of the closed type, for example, having a link section located between the terminal portions 37A and 37B that can deform or break during the clamping of the collar.

[0054] In this case, the retaining section 32A is connected to the linking restorer 34A by an intermediate portion 33A oriented along the periphery of the edge 13 'A of the belt, which intermediate portion itself is linked to a straight portion 33 'A forming a radial spacer between the intermediate section 33A and the first retaining member 34A. Similarly, the additional retaining section 32B is linked to the first additional retaining member 34B by an intermediate portion 33B and a straight portion 33 'B (see Figure 4 ).

[0055] In this case, the straight portions 33 ′A and 33 ′B extend substantially in a plane perpendicular to the axis A and thus progressively move away from the side 13A of the belt as it moves away from the axis A.

[0056] However, it is preferably conceivable that at least one of the first and second link restorers, in contrast, follows the external shape of the lateral surfaces. In this case, this is the case with the second link restorer 38A. Indeed, it can be observed that the latter comprises two branches (respectively 38'A and 38"A) forming two branches of a V-shape that generally matches the external shape of the belt. The same applies to the second additional retaining member, which has two branches 38'B, 38"B.

[0057] In this case, the clamp 30 is formed from a wire material, in particular a metal wire, which material is folded so that the clamp has the different areas just mentioned.

[0058] As indicated, the clamp 30 in this case is an open-type clamp, with terminal sections 37A and 37B each including a free end. On the other hand, in this case, the clamp 30 includes a link section 42 on the sides of the second retaining member 40A and the second additional retaining member 40B. Thus, this link section extends from one of the second retaining member 40A and the second additional retaining member 40B to the other. In this case, the link section has a central portion 43 axially outward of the second side, distal from the edge 13'B of the second side 13B. Typically, the link section has two sections, extending between the second retaining member 40A and the portion 43 and between the second additional retaining member 40B and the portion 43, respectively. As these sections approach portion 43, they gradually move away from the second side 13B. This portion 43 of the link section 42 forms a lever element, axially spaced from the second side, thereby facilitating installation and removal of the clamp from the collar.

[0059] The holding fixture 30 allows the clamping collar to be pre-mounted at the end of a first pipe 2. In this case, the clamping system can also remain pre-mounted at the end of another pipe 4. Figures 3 to 6 In the embodiment shown in FIG, this is achieved by a washer 50, which the clamping system includes. This washer can, for example, be of a generally similar type to that described in EP 1 451 498, having an annular portion and legs by which it is retained relative to the collar. Thus, washer 50 has a frustoconical annular portion 52 that can be inserted between the facing ends of pipes 2 and 4 when pipes 2 and 4 are engaged in the clamping system. In practice, washer 50 is retained relative to the band, in this case relative to its second side 13B, by the retaining legs, so that an annular space is formed between this second side and the washer. The free end of the second pipe 4, bearing its clamping surface 20, is inserted into this annular space located inside the groove 14, while the free end of the first pipe 2, bearing its clamping surface 18, is inserted on the opposite side of this annular space relative to the washer, that is, against the inner surface of the frustoconical shape 52 of washer 50. In this case, as indicated, the end of tube 4 has an internal flared shape, with the inner circumference of the tube at clamping surface 20 forming a flared shape. On the other hand, the free end of first tube 2 is a convex end having an outer perimeter 23 extending beyond its clamping surface 18, the diameter of which gradually decreases toward the termination of the free end. Therefore, a portion of end 23 thus formed can be inserted into the flared shape formed at the end of tube 4 in a substantially form-fitting manner. The frustoconical portion 52 of gasket 50 can have an annular deformation, forming a seal between the inner surface of the flared shape of the end of the first tube and the outer perimeter of end 23.

[0060] By means of the fixing legs or pre-mounting legs 54 with which the washer is fitted, the fixing of the washer 50 to the collar and / or the pre-mounting of the clamping system comprising collar and washer on the pipe 4 can be ensured in the same manner as in EP 1 451 498. Figure 3 It is particularly observed that these legs can be of several types, some forming hooks to hook on the edge 13 'B of the side 13B, others formed by supporting tabs tending to cooperate with the inner periphery of the side 13B. Some of these legs also have gripping surfaces, for example formed by inwardly curved tabs, so as to grip on the gripping surface 20A of the tube 4 when they are engaged in the collar.

[0061] However, other modes of securing the washer to the collar can be used. For example, the washer can have a retaining ring in which the shank of the screw 24 can engage, and one or more retaining legs that are retained on the edge of the band, for example by hooking or clamping / pressing. Similarly, other modes of pre-installing the clamping system relative to the tube 4 can be used, for example by equipping the washer with internal legs or clamps that engage in the tube 4 to adhere to the inner surface of the tube 4.

[0062] Figure 5 A variant 130 for the outer retaining clamp is shown, which allows ensuring pre-installation relative to each of the two tubes. This clamp 130 has a strong similarity to the clamp 30 just described. The same elements of the clamp 130 as those of the clamp 30 are shown. Figure 5 100. The difference between the clamp 30 and the clamp 130 is that the latter also has an additional opposing retaining section situated on the side of the second side 13B of the strip to cooperate with the gripping surface of the second tube 4. In this case, this opposing retaining section is formed in the extension of one of the first and second retaining members.

[0063] In this case, the fixture 130 has such a relative holding section, which is formed in the extension of each holding member. Therefore, the first holding member 160A has an extension that forms a deformation 162A, which extends radially inward and forms a relative holding section. In this case, the extension is formed by a U-shaped ring, the base of which is positioned radially inward. Similarly, the second holding section 170A also has an extension 172A, which extends radially inward and, in this case, also forms a relative holding section by having a ring shape. In this case, the fixture 130 also includes first and second additional holding members 160B and 170B, respectively, and the first and second additional holding members also have similar extensions 162B and 172B, respectively. The ring in which the opposing retaining sections 162A and 172A and the additional opposing sections 162B, 172B are formed is shaped so that they can flex and move apart during insertion of the end of the tube 4 into the collar to allow such insertion, and elastically return to position in the pre-installed condition to retain the end of the tube 4 inside the collar.

[0064] The outer retaining fixture is stably held relative to the collar by two axially opposite sides of the collar. The outer retaining fixture is mountable and removable on the collar, and the system may not include additional fixing means, in particular permanent fixings such as welding. Indeed, once mounted on the collar, the retaining fixture remains securely attached to the collar. The retaining fixture is a convenient component that is relatively inexpensive to manufacture and may or may not be associated with the collar, thereby allowing for a wide variety of supplies.

Claims

1. A clamping system for connecting a first tube (2) and a second tube (4), the facing ends of the first and second tubes having clamping surfaces (18, 20) protruding relative to the cylindrical outer surfaces of the first and second tubes, the system comprising a collar (10), the collar comprising a strip (12), the strip being capable of clamping around the clamping surfaces, the strip (12) having a first side (13A) and a second side (13B), the first and second side extending on either side of a median radial plane (P) perpendicular to the axis of the strip, and an internal groove (14) defined between the first and second side, the internal groove being capable of receiving the clamping surfaces (18, 20), the collar carrying an external retaining fixture (30; 130), characterized in that The outer retaining fixture (30, 130) comprises: a holding section (32A; 132A) and an additional holding section (32B; 132B), said holding section and said additional holding section being angularly spaced apart from one another and being situated on one side of said first side, a first retaining member (36A; 160A) and a second retaining member (40A; 170A) located on one side of the second side (13B) and linked to the retaining section, and a first additional retaining member (36B; 160B) and a second additional retaining member (40B; 170B), the first additional retaining member and the second additional retaining member being located on one side of the second side (13B) and being linked to the additional retaining section, The collar is thereby held axially between the holding section and the first and second holding members, and axially between the additional holding section and the first and second additional holding members, the holding section and the additional holding section being elastically deformable from a rest position in which they project towards the axis (A) of the strip relative to an edge (13'A) of the first side (13A) in a non-clamped position of the strip (12), so as to move the holding section and the additional holding section away from the axis of the strip.

2. The clamping system according to claim 1, wherein: The first retaining member (36A; 160A) and the second retaining member (40A; 170A) are hooked on the following area of ​​the collar (10) which is located on the other side of the median radial plane (P) relative to the first side, as viewed from the side of the first side (13A).

3. The clamping system according to claim 2, wherein: When viewed from the side of the first side surface (13A), at least one of the first holding member and the second holding member is hooked on the second side surface (13B).

4. The clamping system according to claim 2, wherein: The collar (10) has at least one lug (12B) protruding radially relative to the periphery of the strip (12), and wherein, viewed from the side of the first side (13A), at least one of the first and second retaining members is hooked on the lug.

5. The clamping system according to claim 4, wherein: The lugs are used to grip the strap.

6. The clamping system according to claim 1, wherein: The retaining section (32A; 132A) and the additional retaining section (32B; 132B) are diametrically opposed.

7. The clamping system according to claim 1, wherein: The second retaining member (40A; 170A) and the second additional retaining member (40B; 170B) are linked by a linking section (42; 142), which is located on one side of the second side surface (13B).

8. The clamping system according to claim 7, wherein: The link section (42; 142) comprises a portion (43; 143) forming a lever axially spaced from the second side surface (13B).

9. The clamping system according to claim 1, wherein: The outer retaining clamp (30; 130) is symmetrical relative to the diameter plane (PD) of the strip.

10. The clamping system according to claim 1, wherein: The outer retaining clamp (30; 130) is formed from a wire material.

11. The clamping system according to claim 10, wherein: The outer retaining clamp (30; 130) is formed from a metal wire.

12. The clamping system according to claim 1, wherein: The holding section (32A; 132A) has a rectilinear shape in a free state, which is parallel to the diameter of the strip.

13. The clamping system of claim 1, wherein: The additional holding section (32B; 132B) has a rectilinear shape in a free state, which is parallel to the diameter of the strip.

14. The clamping system of claim 1, wherein: The outer retaining clamp (130) includes opposing retaining sections (162A, 172A) located on one side of the second side (13B) and capable of being elastically deformed from a static state so that the opposing retaining sections move away from the axis of the strip, in which static state the opposing retaining sections protrude toward the axis (A) of the strip relative to an edge (13'B) of the second side (13B) in a non-clamped state of the strip (12).

15. The clamping system according to claim 14, wherein: At least one of the first and second retaining members has an extension in which the opposing retaining sections (162A, 172A) are formed.

16. The clamping system according to any one of claims 1 to 15, wherein: The first retaining member (36A; 160A) and the second retaining member (40A; 170A) are linked to the retaining section (32A; 132A) by a first link resetter (34A; 134A) and a second link resetter (38A; 138A), respectively.

17. The clamping system according to claim 16, wherein: At least one of the first link resetter and the second link resetter follows the outer shape of the first side surface (13A) and the second side surface (13B).

18. The clamping system according to any one of claims 1 to 15, wherein: The first additional retaining member (36B; 160B) and the second additional retaining member (40B; 170B) are linked to the additional retaining section (32B; 132B) by a first additional link resetter (34B; 134B) and a second additional link resetter (38B; 138B), respectively.

19. The clamping system of claim 18, wherein: At least one of the first additional link resetter and the second additional link resetter follows the outer shape of the first side surface (13A) and the second side surface (13B).

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