EP1280633B1 - Collar clamping pliers - Google Patents

Description

The present invention relates to a clamp for clamping a clamp which has two end portions respectively provided with a radial projection called ear and a hook adapted to be hooked on said ear to achieve the clamping of the collar, the clamp comprising two jaws respectively able to cooperate with the ear and with the hook and to be close together to hook the hook on the ear.

Tightening the clamp reduces the diameter of the collar bringing the hook closer to the ear, until it passes over this one and clings to her. To tighten the collar, we put it first in place around the object to be tightened, in the open state, it is positioned correctly then, with a clamp, the above operation is performed.

In some cases, the collar needs to be positioned very precisely. This is for example the case when the collar is used to tighten a pipe on a nozzle with a seal, which requires that the clamping forces are applied in a particular region of the tip, for example between two beads that has the latter. It may also be necessary for the collar to be oriented particular way on the pipe.

When the collar is disposed in the open state on the object to be clamped, it can move slightly in relation to the latter, for example by turning around its axis. In addition, it happens that we move slightly by inadvertently placing the jaws of the clamp against, respectively, the hook and the ear. It is therefore important put the collar back in place before tightening or holding it with one hand while squeezing it with the other.

Moreover, the jaws of the forceps are usually simply placed respectively behind the hook and behind the ear. It can happen that, during an unfortunate manipulation, the hook or the ear escapes the jaw that was applied against him or against her. In such a case, the entire tightening operation is to start again. US-A-4,633,558 discloses such a clamp.

The aim of the invention is to propose a type of collet aforementioned, to facilitate the tightening operation by mastering better positioning of the collar during tightening and avoiding that the collar does not escape the jaws of the clamp.

This goal is achieved thanks to the fact that at least a first jaw is equipped with a movable retainer relative to it enters a holding position in which this organ of restraint is able to cooperate with at least one of the elements formed by the ear and the hook to retain said element against said jaw and a release position in which it releases said element with respect to this jaw.

Thanks to these arrangements, when the jaws of the clamp are applied on the collar, the hook or the ear is held against the jaw with which he or she cooperates. This prevents the collar does not escape the clamp. Thus, if the collar is incorrectly positioned, its position can be rectified by manipulating the clamp since the collar is provisionally secured by the retainer. Moreover, it prevents the jaw provided with the retainer slips relative to the hook or the ear when tightening the clamp.

Advantageously, the first jaw comprises a bearing surface facing the second jaw and the organ of retained is disposed beyond this bearing surface in the direction going to said second jaw.

So, when this jaw is disposed against one of elements constituted by the hook and the ear, this element comes into bearing against the bearing surface, and the retaining member, which is disposed in front of its support surface, retain this element in this position.

In an advantageous configuration, the retaining member is movable transversely to the direction in which the jaws are moved to be near or far away from each other.

The retaining member can thus be arranged simple, in a limited space.

Advantageously, the clamp comprises return means elastically urging the retaining member permanently towards its holding position.

In this case, since the jaw provided with the restraint is arranged against one of the elements formed by the ear and the hook, this element is automatically retained in this jaw by the automatic positioning of the organ of retained in its retaining position.

Advantageously, the clamp comprises a solicitation member adapted, when clamping the clamp, to cooperate with the body of restraint for urging said retainer member towards its position of relaxation.

In this case, the release of the retaining member by relative to the element (hook or ear) that it retains also operates automatically just by tightening the clamp. Preferably, the biasing member is arranged so that the organ of restraint only reaches its release position when the clamp is tight. This increases the safety of the clamping, preventing the clamp from being separated from the collar until it is properly tightened.

Advantageously, the retaining member is formed by a lever pivoted on the first jaw.

The pivoting lever, for example in the form of a claw, constitutes a particularly simple embodiment.

Advantageously, the two jaws are provided with a similar retainer.

The hook and the ear having a suitable configuration, this allows to retain each of these two elements protruding against, respectively, each of the two jaws. Moreover, if jaws are substantially identical, this makes it possible to apply indifferently one of them against the hook or against the ear, without a jaw being precisely adapted to the hook and that the other is precisely adapted to the ear.

According to an advantageous embodiment, the jaws are mounted on, respectively, a first and a second arm of support being able to pivot relative to these arms around a orientation axis substantially parallel to the direction in which the jaws are moved to be near or far one from the other.

Sometimes there is insufficient clearance around of the object to be clamped to allow the approach of the clamp in a plane radial perpendicular to the axis of the collar. Quite simply, for various practical reasons, the user may wish to orient the clamp relative to such a radial plane. This is made possible thanks to the ability of the jaws to pivot on their support arms.

For example, one can arrange the clamp normally around the collar and orient this clamp so as to place it in a position in which tightening is more convenient. We can also have previously oriented the jaws in a suitable position to facilitate the approach of the clamp compared to the collar.

In this case, the clamp preferably comprises means to secure the two jaws in rotation in their pivoting around the axis of orientation.

This solidarity in rotation means that, once we have rotates one jaw around its axis of orientation, the other jaw rotates at the same time, around its own axis orientation, according to the same angle.

These means of securing in rotation facilitate greatly handling of the clamp since they ensure that both Jaws always have the same orientation.

Advantageously, the two jaws are secured in rotation by an articulated connection axis, able to adopt a extension configuration when the jaws are apart and a fold configuration when the jaws are tight against each other the other.

This articulated link axis is a simple way to link the two jaws pivoting, which does not interfere with the clamping the clamp.

• la figure 1 est une vue en élévation, prise selon l'axe de pivotement des bras de la pince, d'une pince conforme à l'invention, les mâchoires et les portions d'extrémité des bras qui les portent étant représentées en coupe dans un plan perpendiculaire à l'axe de pivotement de ces bras, un collier de serrage étant partiellement représenté en prise avec les mâchoires, ces dernières étant représentées en position ouverte de la pince ;
• la figure 2 est une vue agrandie des mâchoires, dans la même coupe que sur la figure 1 ;
• la figure 3 est une vue selon la flèche III de la figure 2 ;
• la figure 4 est une vue en coupe selon la ligne IV-IV de la figure 3 ;
• les figures 5, 6 et 7 correspondent respectivement aux figures 2, 3 et 4 pour la position serrée des mâchoires de la pince ;
• la figure 8 montre schématiquement un collier de serrage serré à l'aide de la pince conforme à l'invention ; et
• la figure 9 est une vue schématique et partielle selon la flèche IX de la figure 1.

The invention will be better understood and its advantages will appear better on reading the detailed description which follows, of an embodiment shown by way of non-limiting example. The description refers to the accompanying drawings in which:

• FIG. 1 is an elevational view, taken along the axis of pivoting of the arms of the clamp, of a clamp according to the invention, the jaws and the end portions of the arms carrying them being shown in section in FIG. a plane perpendicular to the pivot axis of these arms, a clamp being partially shown engaged with the jaws, the latter being shown in the open position of the clamp;
• Figure 2 is an enlarged view of the jaws, in the same section as in Figure 1;
• Figure 3 is a view along the arrow III of Figure 2;
• Figure 4 is a sectional view along the line IV-IV of Figure 3;
• Figures 5, 6 and 7 correspond respectively to Figures 2, 3 and 4 for the clamped position of the jaws of the clamp;
• Figure 8 schematically shows a clamp tightly clamped with the clamp according to the invention; and
• Figure 9 is a schematic and partial view along arrow IX of Figure 1.

The clip shown in FIG. 1 comprises two arms 10 and 12, pivotally mounted relative to one another around an axis A. It also has two support arms, respectively 14 and 16, which each carry a jaw, 18 and 20. In the example shown, the clamp is effort multiplied, the support arm 16 extending in extension of the actuating arm 12, while the support arm 14 is connected to these arms 12 and 16 by a rod system 22 which itself, by a cam system 24 is connected to the actuating arm 10.

The present invention relates to the jaws of the clamp and must be understood that it applies to tongs without effort reduction system or pliers equipped with a force multiplier system different from the one that is represent.

In Figure 1, the clamp is open and its jaws are away from each other. She is recalled in this position opened by a return spring 26 disposed between the arms 14 and 16.

A clamp 28 which shows the two portions terminals is disposed between the jaws of the clamp. A first end portion 28A carries a hook 29, while the second end portion 28B carries an ear 30. To tighten the necklace, we must hang the hook 29 on this ear 30, as we see it in figure 8.

In the example of Figure 1, the collar 28 has a extension 31 called bib, which extends the terminal portion 28B beyond the ear 30.

The collar 28 'of FIG. 8 is of the type described in EP 0 724 106. It includes a first band portion which, at its first end 28'B, wears the ear 30 and which at its second end wear the bib 31 '. The hook 29 is formed on a portion end, 28'A of another portion of tape that is reported on the first portion of the tape. In Figure 2, it is a necklace of this type that is engaged with the jaws.

The jaws 18 and 20 each comprise a piece of jaw, respectively 38 and 40, which is fixed by a nipple, respectively 38A and 40A, to the corresponding support arm, 14 or 16, and which has two cheeks, respectively 38B, 38C and 40B, 40C.

The jaw 20, the jaw 18 is described in more detail. being identical. In all the following, we will consider that the front of a jaw is that of its faces which is turned towards the other jaw, while the back side is opposite to him.

The front face of the jaw piece 40 has a recess 42 delimited upwards by an overhanging zone 44. The surface of this zone 44 forms a support surface for the base 30A of the ear 30 or the base 29A of the hook 29 (see Figure 8). As for example, it has been shown in Figure 2 the cooperation of the collar with the jaws of the forceps, placing the ear 30 in engagement with the jaw 40 and the hook 29 engaged with the jaw 38. that the rear parts of the hook and the ear are engaged in the recesses, respectively 42 and 41 which equip the jaws, and that their respective bases are supported by the bearing surfaces 44 and 43, respectively.

Each of the jaws comprises a retaining member, respectively 45 for the jaw 18 and 46 for the jaw 20. They both are visible in Figure 4. We describe in more detail the retainer 46 which is integral with the jaw 18. It is constituted by a lever whose free end has the shape of a claw 46A fit, as seen in Figure 2, to be engaged under the ear 30 when the latter is engaged with the jaw 20. The base 46B of the lever, that is to say its opposite end to the free end 46A is pivotally mounted on the jaw 20, around a pivot axis A46. More precisely, the base of the lever is attached to the cheek 40B of the jaw piece 40 by a nipple or analogous 48.

It can be seen in FIG. 2 that the retaining element 46 is spaced from the bearing surface 44 in the direction towards the jaw 18. Thus, between this support surface and the retaining element is provided a space to accommodate at least the thickness of the collar in the area of the base of the hook or ear. In some cases, as in the example shown, the base of the ear presents a boss, and it is also taken into account in the spacing of the retaining member relative to the bearing surface.

The double arrow D of Figure 2 indicates the direction in which the jaws move relative to one another for tighten or open the clamp. The axis A46 of rotation of the lever 46 is oriented parallel to this direction D, so that the lever is moves transversely to said direction.

FIG. 3 shows the lever 46 in its active position detention. The width L of the recess 42 corresponds substantially at the width of the hook 29 or the ear 30, measured according to the axial direction of the collar. When the hook or the ear cooperates with a jaw he or she is wedged in the transverse direction T of this jaw by the lateral surfaces 42B and 42C which delimit the recess 42 in each of the cheeks 40B and 40C.

It is understood that, in this situation, the free end 46A of the lever 46 is engaged under the hook or under the ear. Indeed, in the retaining position, the free end 46A protrudes from the surface 42B in the direction towards the surface 42C. The lever 46 is housed in a cavity 50 formed in the cheek 40B of the piece of jaw 40. It can be seen that in the visible restraint position in particular in FIGS. 3 and 4, the back 46C of the lever 46, that is to say the surface of this lever which is remote from the recess 42, is spaced from a distance d relative to the wall 50A which delimits the cavity 50 on the opposite side to the cheek 40C. On the other side, the lever is retained by a stop 50B formed on the face of the cavity 50 opposite on the face 50A. This stop 50B limits the stroke of the lever towards inside the recess 42 (that is to say towards the cheek 40C) ..

The lever 46 is constantly recalled to its position of retained by means of elastic return constituted, in the example shown, by a spring 52, which is arranged around the pin 48, a first end 52A bears against the wall 50A of the cavity 50, and whose other end 52B cooperates with the back of the lever.

The lever 45 that equips the other jaw 18 is mounted from the same way as the lever 46, on the cheek 38B of the piece of jaw 38. It is also pivotally mounted about an axis A45 parallel to the direction D. The two jaws 18 and 20 are identical and they are arranged so that the cheek 38B provided with the lever 45 is in front of the cheek 40C devoid of the lever, as well as the cheek 40B provided with the lever 46 is opposite the cheek 38C devoid of retaining lever. Indeed, in the example represented, it was chosen that each jaw be equipped only of a single restraint.

With the aforementioned arrangement, the retaining lever 45 is suitable to cooperate with one of the attachment elements, for example the hook 29 of the collar, on a first longitudinal edge of the collar, while the other retaining lever 46 cooperates with the other element latch, in this case the ear 30, on the other longitudinal edge of the necklace. It is thus avoided that it is possible to extract the ear and the hook the jaws of the clamp by tilting the collar around a diametral plane of the latter parallel to the direction D.

Figures 5 to 7 show the situation when the clamp is tight. The two jaws are indeed close together one of the other so that the front ends 38 'and 40' of the parts jaws 38 and 40 respectively delimited by the ends of the cheeks 38B and 38C and the frontal ends of the cheeks 40B and 40C are in contact.

This contact is not bothered by the fact that the free ends 45A and 46A levers 45 and 46 are slightly protruding forward of parts of jaws that wear them. Indeed, the front side of the plays 40C has a slight recess 40'C intended to house the projecting portion of the free end 45A of the lever 45. A recess 38'C analog is performed in the cheek 38C and we see in FIG. 5 that it houses the portion projecting from the free end 46A of the lever 46.

In the situation of FIGS. 5 to 7, the retaining levers occupy their respective positions of relaxation. We see it better in FIG. 6, which shows that the lever 46 has entered the cavity 50, the back of this lever being this time located against the wall 50A.

The lever 46 has been brought into this release position by a biasing member 54 which, when clamping the clamp, has rotates this lever by making it enter the cavity 50. Similarly, a biasing member 53 brings the lever 45 into its position of loosening when tightening the clamp.

These solicitation bodies cooperate with the restraint at the moment the clamp is tightened. They're from preferably arranged so that the two retainers can not effectively occupy their positions of looseness both at once than when the clamp is actually tight. For example, the biasing member cooperating with the lever 46 of the jaw 20 can be a part belonging to the other jaw 18, or, as in the example shown, an annex. Similarly, the biasing member 53 can belong to the jaw 18 or an annex.

It could also be provided that the retaining members, in the case levers 45 and 46, are solicited to their position of loosening by a piece belonging to the collar. Thus, the organ of restraint cooperating with the hook could be requested in position loosening of the ear when it is engaged under the hook, while the other retainer, which cooperates with the ear, could be solicited in position of release by the arrival hook on the ear.

Comparing FIGS. 2 and 5, it can be seen that during the gripping the jaws, the jaws tilted so as to straighten towards the center of the necklace. Thus, the pieces of jaws 38 and 40 have rotated a few angular degrees, respectively around a B38 axis and around a B40 axis, these axes being perpendicular to the axis B mentioned in the following.

In FIG. 2, the rear faces 38D and 40D of the pieces of jaws 38 and 40 respectively were supported against first bearing faces, 14A and 16A, bearing arms 14 and 16.

In contrast, in FIG. 5, the rear faces 38D and 40D are spaced apart from the first bearing faces 14A and 16A, but are bearing against the second bearing faces, respectively 14B and 16B, which are inclined with respect to the first of an angle α. then clamping the collar, the hook 29 and the ear 30 move one relative to each other by turning on a circle whose center corresponds globally to the geometric center of the necklace.

If the jaws were fixed relative to the support arms 14 and 16, they would move relative to each other according to a circle whose center is axis A, which is obviously located on the other side of the collar relative to the geometric center of the latter.

Therefore, when tightening the collar, the hook and the ear, on the one hand, and the two jaws, on the other, would have tendency to move on two opposite circles of curvature. The ability of the jaws to tilt relative to each other, respectively around axes B38 and B40, allows them to be able to accompany the movement of the hook and the ear one compared to the other while perfectly maintaining the latter, that is to say that this switch allows them to move also on the circle formed by the necklace.

To allow this tilting, the nipples 38A and 40A of fastening jaws are mounted with a clearance in bores, respectively 14C and 16C of the support arms. The nipples 38A and 40A are held in these holes by circlips, respectively 58 and 60, which hold lock washers, respectively 62 and 64, bearing against the thrust washers, respectively 66 and 68, in abutment against the shoulders which define the holes 14C and 16C on the back of the support arms.

These circlips and washers can be replaced with washers spring, crossed by the nipples and plated against rear faces of the support arms into which the holes 14C and 16C with metal clips, these washers are deforming to allow the tilting of the nipples.

As seen in Figure 2, the jaws are constantly reminded of their position of support against the first bearing faces 14A and 16A, by springs, respectively 70 and 72, whose ends are supported in bores of the support arms, respectively 74 and 76, which are wrapped around the nipples 38A and 48A to form at least one turn on the back of the jaw pieces.

Jaws can also be rotated around an axis of orientation B defined by the direction D of approximation and removal of these jaws. Thus, Figure 9 shows in strong line the jaws arranged in the extension support arms of the clamp, for clamping a collar 28 whose axis geometric C is parallel to the axis A of articulation of the connecting axis, itself perpendicular to the axis of orientation B of the arms of the clamp. The jaws can rotate around the B axis to tighten a collar oriented differently, for example, as shown in interrupted joint in FIG. 9, a collar whose geometric axis C ' would be perpendicular to the axis A.

According to the invention, the clamp comprises means for linking the two jaws 18 and 20 in their pivoting about the axis In the preferred embodiment shown, these means are formed by an articulated link axis which connects the jaws between them, the articulations of the axis not being understood not parallel to the B-axis. This articulated link axis 80 can adopt an extension configuration in the open position of the clamp (FIG. 2) and a folding configuration in the clamping position (FIG. 5). Sure Figures 2 and 5, the jaw parts are represented in cut, but the connecting axis is shown in external view.

To avoid disturbing the tightening of the clamp and that of the collar, the articulated connection axis 80 is arranged in a region of jaws which is located between their supporting surfaces that cooperate with the collar and the hinge pin A of the connecting pin perpendicular to the axis of orientation of the clamp. We could also provide a sliding rod system to link the jaws in their rotation around the B axis.

In the example shown, the link axis comprises a rigid shaft section 82 which is connected to each of the jaws by a connecting rod, respectively 84 and 86. Thus, the connecting rod 84 is fixed between the two cheeks 40B and 40C of the jaw piece 40 being able to rotate about it about an axis A84, perpendicular to the axis B. A first end 82A of the shaft section 82 is fixed on this connecting rod 84 being able to pivot with respect to it around an axis B84 parallel to axis A84. Similarly, the rod 86 is arranged between the cheeks 38B and 38C being pivotable about an axis A86, while that the end 82B of the axle section is fixed to it by being able to pivot around a B86 axis.

When the jaws are in the position shown in strong line in Figure 9, the axes A84, B84, A86 and B86 are parallel to the hinge axis A of the connection axis perpendicular to the axis orientation of the clamp. The axis extension configuration articulated 80 is defined by the abutment of the lower face 82 ' of the shaft section 82 (remote face of the bearing surfaces 44 and 43) with abutment surfaces formed on cheeks 40B and 40C of the piece of jaw 40 and on the cheeks 38B and 38C of the piece of jaw 38 (Figure 3).

In this position, the rods 84 and 86 are disposed of such so that the B84 and B86 axes are at most away from the faces back of the jaw parts that wear them. When the clamp is tightened, the articulated axis passes into its fold configuration, thanks to the that the connecting rods 84 and 86 rotate so as to respectively bring the axes B84 and B86 closer to said rear faces, up to reach the position shown in Figure 5.

The shaft section 82 has lights 85 and 87 enabling the folding of the connecting rods through them. It has been stated previously that, by means of biasing members 53 and 54, the levers 45 and 56 were brought into their exhaust configuration when the clamp is tight.

In the advantageous example represented, these stress are formed on the articulated connection axis and, more precisely, on the axis segment 82. Indeed, when the clamp is tight, the longitudinal edges (parallel to the axis B) of the axis section 82 move against the solicitation surfaces (respectively 45D and 46D), respectively belonging to the levers 45 and 46. The actuating members are formed by bulges, made on the longitudinal edges of the axis segment 82, and whose ends 53A and 54A intended to be the first in contact with the actuating surfaces of the levers 45 and 46 are shaped in ramp.

By comparing Figures 3 and 6, it is understood that when the section of axis 82 progresses to its folded position, the bulge 54 slides against the operating face 46D of the lever 46, up to bring the latter into its release position. When the section of axis 82 reaches its folded position shown in FIG. 5, the two bulges 53 and 54 cooperate respectively with the lever 45 and with the lever 46, so that these two levers of restraint are in their relaxed positions. The collar, whose hook has been hooked on the ear, can then be extracted from jaws.

Preferably, to facilitate the introduction of the collar between jaws before clamping the clamp, the retainer lever 46 has a ramp surface that cooperates with one of the elements constituted by the hook and the ear of the necklace when this element is pushed towards the bearing surface 44, to drive the lever to fade until this element rests on this surface support. In this situation, the lever can resume its position of detention. For this purpose, the ends 45A and 46A of the levers 45 and 46 are rounded.

In the example shown, the two jaws of the clamp are the same. Thus, the hook 29 and the ear 30 are both held by these retaining levers in the jaws of the clamp.

A clearance 29 'is provided under the hook 29, allowing the insertion of the active free end 45A of the lever 45 under the hook. The fold forming the back of the hook is therefore in support against the bearing surface 43 and can not be extracted forwards since its front face is retained by the retaining lever 45.

The collar intended to be clamped by the clip according to the invention also has a clearance 30 ', provided under the ear. It can be seen in FIG. 8 that the ear 30 is slightly "opened". Indeed, the two folds 30B and 30A which delimit this ears are spaced from each other so as to spare them this clearance 30 '. The internal faces of these two folds are spaced at a distance d at least equal to the thickness of the active free end of the lever 45 or the lever 46.

Claims (13)

1. Pliers designed to tighten a clamping collar (28; 28') which has two end portions (28A, 28B; 28'A, 28'B) provided respectively with a radial projection or "lug" (30) and with a hook (29) suitable for engaging said lug to tighten the collar, the pliers including two jaws (18; 20) suitable for co-operating respectively with the lug and with the hook, and for being moved towards each other to engage the hook on the lug;
      said pliers being characterised in that a first jaw (18; 20) is equipped with a retaining member (45; 46) that is mounted to move relative to it between a retaining position (Figure 3) in which said retaining member is capable of co-operating with at least one of the elements constituted by the lug (30) and by the hook (29) to retain said element against said jaw, and a release position (Figure 6) in which it releases said element relative to said jaw.
2. Pliers according to claim 1, characterised in that the first jaw (18; 20) is provided with an abutment surface (43; 44) facing the second jaw (20; 18), and in that the retaining member (45; 46) is disposed beyond said abutment surface in the direction going towards said second jaw.
3. Pliers according to claim 1 or 2, characterised in that the retaining member (45; 46) is mounted to move transversely (T) to the axis (D) along which the jaws (18; 20) can be moved towards each other or apart from each other.
4. Pliers according to any one of claims 1 to 3, characterised in that they include resilient return means (52) urging the retaining member (45; 46) continuously towards its retaining position.
5. Pliers according to any one of claims 1 to 4, characterised in that they include an urging member (53; 54) capable, during closing of the pliers, of co-operating with the retaining member (45; 46) to urge said retaining member into its release position (Figure 6).
6. Pliers according to any one of claims 1 to 5, characterised in that the retaining member is formed by a lever (45; 46) pivotally mounted (A45; A46) on the first jaw (18; 20).
7. Pliers according to any one of claims 1 to 6, characterised in that the jaws (18; 20) are mounted on respective ones of first and second support arms (14; 16) so that they are capable of pivoting relative to said arms about an angular positioning axis (B) that is substantially parallel to the axis (D) along which the jaws are moved towards each other or apart from each other.
8. Pliers according to claim 7, characterised in that they include means (80) for constraining the two jaws (18; 20) to move together as they pivot about the angular positioning axis (B).
9. Pliers according to claim 8, characterised in that the two jaws are constrained to pivot together by a hinged coupling pin (80) that is capable of taking up a deployed position (Figure 2) when the jaws (18; 20) are spaced apart, and a folded-up configuration (Figure 5) when the jaws are clamped together.
10. Pliers according to claim 9, characterised in that the coupling pin (80) comprises a rigid pin segment (82) connected to each of the two jaws (18; 20) by a respective link (84; 86).
11. Pliers according to claim 5 and according to claim 9 or claim 10, characterised in that the urging member (53; 54) is secured to the coupling pin (80).
12. Pliers according to any one of claims 1 to 11, characterised in that the two jaws (18; 20) are identical.
13. A kit comprising pliers according to any one of claims 1 to 12, and a clamping collar (28) to be tightened by means of pliers;
       characterised in that the lug (30) has two folds (30B; 30C) spaced apart from each other so as to provide a recess (30') between them, in which the retaining member (45, 46) can be received.

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