Device for tightening an object comprising a belt

Abstract

The clamping device comprises a belt (10) having at least a first and a second clamping end (11A, 12A) and a clamping member (14) which connects the two clamping ends by being retained relative thereto such that the clamping and the clamping member move the first and second clamping ends relative to each other by tightening the belt. The clamping member (14) is retained relative to at least the first clamping end (12A) via a spring (24) and a connecting piece (26) such that tightening the clamping member (14) tends to move the connecting piece (26) relative to the first clamping end (12A) against the elastic return of the spring. The connecting piece (26) is adapted to occupy, relative to the first clamping end (12A), a waiting position in which it holds the spring (24) with respect to the first clamping end. Figure 1

Description

Title of the invention: Device for tightening an object comprising a belt Technical field

[0001] The disclosure relates to a clamping device comprising a clamping belt for clamping an object.

[0002] This is in particular a clamping device for clamping an object that may experience expansions while the clamping must be maintained. In particular, this object may be a hydrogen tank and the clamping device may make it possible to keep this tank clamped and to fix it to a support such as a part of a vehicle chassis. A hydrogen tank experiences significant expansions. Indeed, the filling pressure of such a tank typically reaches several hundred bars, for example from 350 to 750 bars. Such a tank may be made of various materials, for example a composite material possibly reinforced with fibers such as carbon fibers. The very high filling pressures lead to this tank expanding, while it contracts as its internal pressure decreases when the hydrogen is consumed.

[0003] Generally speaking, the clamping device according to the disclosure can be used to clamp other objects which may experience expansion, but for which it is important to maintain the clamping as it expands.

[0004] The object in question may in particular be cylindrical in shape, or at least include a clamping portion in which it has a symmetry of revolution. The clamping device comprises a belt which is clamped onto the clamping portion of this object. The clamped belt must be able to accompany the expansions of this object, that is to say its diametrical dimensions must be able to increase or decrease while maintaining the clamping force.

[0005] For this purpose, the clamping device may comprise a spring. To achieve the clamping of this object, the belt must be placed around the clamping portion of said object, and be able to be clamped in this situation. The forces involved during this positioning and this clamping may be significant, due to the reaction forces exerted by the object on the belt and the return forces exerted by the spring, against the clamping force. Thus, it may be difficult to mount and / or position the belt around the object and to achieve the clamping while correctly holding this belt and this spring. Statement of the invention

[0006] The disclosure relates to a clamping device comprising a clamping belt, a clamping member which moves ends of the belt relative to each other to tighten the belt, and a spring serving to maintain the tightening force exerted by the belt, despite possible expansions of the object tightened by the device.

[0007] The disclosure aims to propose such a clamping device whose placement on the object to be clamped and clamping around this object can be carried out in a simple manner, in particular without risking losing the spring or carrying out complex manipulations to keep it in place before and during clamping.

[0008] Thus, according to a first aspect, the disclosure relates to a device for clamping an object, comprising a belt having at least a first and a second clamping end and a clamping member which connects the two clamping ends while being retained relative to the latter so that the tightening of the clamping member moves the first and second clamping ends relative to each other by tightening the belt, the clamping member being retained relative to at least the first clamping end via a spring and a connecting piece, so that the tightening of the clamping member tends to move the connecting piece relative to the first clamping end against the elastic return of the spring, the connecting piece being able to occupy, relative to the first clamping end, a waiting position in which it holds the spring with respect to the first clamping end.

[0009] The tightening of the belt is achieved by moving the first and second tightening ends relative to each other by tightening the tightening member, i.e. by activating or actuation of the latter in the tightening direction. However, this tightening member is retained relative to the first end of the belt via the spring and the connecting piece, so that tightening the tightening member has the effect of moving the connecting piece relative to the first tightening end against the elastic return of the spring. More precisely, tightening the tightening member moves the spring which, subject to its elastic deformation, drives the first tightening end so that it moves relative to the second tightening end, and this movement of the spring also causes that of the connecting piece.

[0010] It is therefore understood that, when the clamping member cooperates with the first and second ends to clamp them, it tends to move the first end by first exerting a force on the spring. For example, if this spring works in compression, the clamping is exerted on the connecting part which tends to compress the spring and, when the satisfactory level of compression is reached, this causes the first clamping end to move relative to the second clamping end. It is therefore understood that the spring makes it possible, depending on its level of compression, to maintain the clamping by ensuring the correct positioning of the second clamping end of the belt relative to the first.

[0011] However, before tightening, the connecting piece occupies its waiting position in which it holds the spring with respect to the first tightening end. Thus, the spring is pre-mounted at the first end of the belt while being correctly held relative to the connecting piece. The tightening device can therefore be put in place around the object to be tightened without risking losing the spring or without having to handle it. Once the tightening device is put in place on the object to be tightened, tightening can be carried out by the tightening member.

[0012] Optionally, the device comprises a member for holding the connecting piece in the waiting position, in particular a waiting clipping member.

[0013] Optionally, the connecting piece is capable of occupying a clamping threshold position which is reached by the clamping of the clamping member.

[0014] Optionally, the device comprises a threshold mark to determine that the clamping threshold position has been reached, the threshold mark comprising in particular a threshold clipping member.

[0015] Optionally, the connecting piece is capable of occupying a maximum tightening limit position, the device optionally comprising a maximum tightening stop.

[0016] Optionally, the connecting piece forms a cage portion in which the spring is arranged, the connecting piece optionally having a portion for centering the spring.

[0017] Optionally, the clamping member comprises a clamping rod and the cage portion formed by the connecting piece has a retaining surface against which a retaining element of the clamping rod is retained, such as a head of said rod, said retaining surface optionally comprising an anti-rotation member of the clamping rod and being optionally located on an external face of the centering portion of the spring.

[0018] Optionally, the connecting piece has a U shape having two branches, the connecting piece being inserted onto the first clamping end so that this first clamping end passes between the two branches, the member for holding the connecting piece in the waiting position comprising at least one holding projection projecting from the internal face of at least one of the two branches.

[0019] Optionally, the connecting piece has a U shape having two branches, the connecting piece being plugged onto the first clamping end so that this first clamping end passes between the two branches, the threshold mark comprising a reference projection projecting on the internal face of at least one of the two branches.

[0020] Optionally, the connecting piece has a U-shape having two branches, the connecting piece being plugged onto the first clamping end of such that this first clamping end passes between the two branches, at least one of the two branches having a maximum clamping stop projection.

[0021] Optionally, the clamping member comprises a clamping rod which is retained relative to the second clamping end of the belt by a nut.

[0022] Optionally, the belt comprises a first belt portion, a first end of which forms one of the first and second tightening ends, and a second belt portion, a first end of which forms the other of the first and second tightening ends, said second belt portion forming a fixing portion configured to be fixed to a support.

[0023] Optionally, the belt comprises a first belt portion, a first end of which forms one of the first and second tightening ends, and a second belt portion, a first end of which forms the other of the first and second tightening ends, the second ends of the first and second belt portions being connected by a hinge.

[0024] Optionally, the second end of the second belt part has a retaining zone, relative to which the second end of the first belt part is pivotally retained by a pivot axis, the retaining zone comprising in particular a slot into which the second end of the first belt part is inserted.

[0025] Optionally, the first belt part has a torsion zone bringing the second end of the first belt part substantially at a right angle relative to a current part of the first belt part, the pivot axis being perpendicular relative to said second end of the first belt part, in particular by being engaged in a bore of the second end of the first belt part, this bore optionally having a collar.

[0026] Optionally, the second end of the first belt portion has a longitudinal fold along which two halves of the first belt portion are brought together, optionally being held pressed against each other, for example by welding or clinching.

[0027] Optionally, the first belt portion has a boss located on the other side of the torsion zone relative to the second end of the first belt portion.

[0028] Optionally, the second end of the first belt part has two parallel tabs each inserted into a slot in the retaining area.

[0029] Optionally, the two legs are separated by a cutout and the second end of the first belt part has a twisting zone comprising two twists bringing each of the legs substantially at a right angle relative to a current part of the first belt part.

[0030] The disclosure also aims to propose a clamping device which comprises a belt having two belt parts articulated relative to each other. It is then a question of proposing a simple and easy-to-implement articulation, and capable of withstanding significant tension forces, in particular when the clamping device is used to apply significant clamping forces, for example of the order of 300 to 800 dN, in particular when the clamping device is used to clamp an object of the hydrogen tank type.

[0031] According to a second aspect, the disclosure also relates to a device for clamping an object, comprising a belt comprising a first belt portion, a first end of which forms a first clamping end, and a second belt portion, a first end of which forms a second clamping end, the first ends of the first and second belt portions being movable relative to each other to clamp the belt, the first belt portion having a torsion zone bringing the second end of the first belt portion substantially at a right angle to a running portion of the first belt portion, and the second end of the second belt portion having a retaining zone,with respect to which the second end of the first belt part is pivotally retained by a pivot axis perpendicular to said second end of the first belt part, in particular by being engaged in a bore of the second end of the first belt part.

[0032] The inner periphery of the belt generally defines a cylindrical surface or a portion of a cylindrical clamping surface parallel to which the running part of the belt is oriented, in particular the running part of the first belt part. However, due to the twisting of the first belt part, the second end of this first part is brought at a right angle to this running part, which allows it to cooperate easily with the retaining zone of the second end of the second belt part by retaining it relative to it by the pivot axis perpendicular to the second end of the first belt part.When, in particular, the axis is engaged in a bore of the second end of the first belt part, the cooperation between the pivot axis and this first belt part can withstand significant forces, while the structure and manufacture of the belt can be particularly simple and require little material.

[0033] Optionally, according to the second aspect, the retaining zone comprises a slot into which the second end of the first belt part is inserted, such that the pivot axis is located on the other side of the slot relative to the running part of the first belt part.

[0034] Optionally, according to the second aspect, the second end of the first belt portion has a longitudinal fold according to which two halves of the first belt portion are brought against each other, optionally being held pressed against each other, for example by welding or clinching.

[0035] Optionally, according to the second aspect, the first belt portion has a boss located on the other side of the torsion zone relative to the second end of the first belt portion.

[0036] Optionally, according to the second aspect, the second end of the first belt part has two parallel tabs each inserted into a slot of the retaining zone.

[0037] Optionally, according to the second aspect, the two legs are separated by a cutout and the second end of the first belt part has a twisting zone comprising two twists bringing each of the legs substantially at a right angle relative to a current part of the first belt part. Brief description of the drawings

[0038] The description will be clearly understood and its advantages will appear better on reading the detailed description which follows, of embodiments represented as non-limiting examples. The description refers to the appended drawings in which:

[0039] [Fig-1] [Fig.l] is a perspective view of the clamping device according to the present exposed.

[0040] [Fig.2] [Fig.2] is a front view of the device of [Fig.l].

[0041] [Fig.3] [Fig.3] is an exploded perspective view showing several components or parts of components of the device according to this disclosure.

[0042] [Fig.4] [Fig.4] is a perspective view of the device according to the present disclosure, with an enlargement in the clamping area, the connecting piece being in its waiting position.

[0043] [Fig.5] [Fig.5] is a side view of the connecting piece.

[0044] [Fig.6] [Fig.6] is a perspective view of the device, showing enlargements movements in the clamping area and in a joint area, the connecting part being shown in a clamping threshold position.

[0045] [Fig.7] [Fig.7] is a perspective view of the device, with an enlargement in the clamping area, the connecting part being shown in the clamping threshold position.

[0046] [Fig.8] [Fig.8] is a perspective view of the device, with enlargements in the clamping area and in the articulation area.

[0047] [Fig.9] [Fig.9] is a perspective view showing part of the device of tightening according to an alternative embodiment.

[0048] [Fig. 10] [Fig. 10] shows in perspective the connecting piece according to a variant.

[0049] [Fig. 11] [Fig. 11] illustrates another variant for the connecting piece.

[0050] [Fig. 12] [Fig. 12] shows in perspective a variant for the configuration of the articulation area.

[0051] [Fig. 13] [Fig. 13] shows the same variant as [Fig. 12], from another angle. Description of the embodiments

[0052] The device shown in [Fig.l] comprises a belt 10 which, in this case, comprises a first belt part 11 and a second belt part 12 connected to each other. The belt has a first tightening end 12A which, in this case, is formed by one end of the second belt part 12, and a second tightening end 11A which, in this case, is formed by one end of the first belt part 11. Of course, the first and second tightening ends could be reversed.

[0053] For the purposes of this disclosure, unless otherwise specified, the elements referred to as internal or interior are those which are arranged on the internal side of the belt, that is to say in the annular space delimited by the belt, while the external or exterior elements are those which are arranged on the opposite side. Similarly, unless otherwise specified, it will be considered that an element will be described as "internal" in relation to another element called "external" when the internal element is closer to the interior of the belt or to the axis of the latter, than the external element. Here, the axis of the belt can be defined by the axis of a circle circumscribed to the belt.

[0054] A clamping member 14 connects the two clamping ends 11A and 12A. In this case, the belt parts 11 and 12 are connected by an articulation at their respective second ends 11B and 12B. It can be seen that, when assembled, the two belt parts define between them an internal contour capable of receiving an object to be clamped by the device, in particular a clamping portion of such an object which may for example be a hydrogen tank. Thus, the device can clamp a cylindrical part of revolution or, generally speaking, a shape capable of being encircled by the belt.

[0055] Generally speaking, the various constituent elements of the device are made of metal. This is particularly the case for the belt. However, clamping contact parts, which may be in contact with the object to be clamped by exerting clamping pressure on the latter, may be coated with a material such as an elastomeric material of the EPDM (ethylene-propylene-diene monomer) type. It can thus be seen that a current part of the belt part 11 is coated, on its internal face, with a sheath 16 and that, likewise, the second belt part 12 has contact parts with the object to be clamped also coated with sheaths 16A, 16B on their internal faces. The sheaths provide contact surfaces between the device and the clamped object which are not harmful to this object. In addition, they may have non-slip properties, for example by being ribbed as in the example shown. These sheaths may locally cover all the faces of the portion of belt concerned or, as in the example shown, only cover the internal face while being secured to the belt by any means, for example by grooves on the sides of the sheath, in which the edges of the belt are to be clamped.

[0056] In this case, the first belt part 11 forms a strapping part, having a contour in the form of a portion of a cylinder of revolution, to come into clamping support against the cylindrical surface of the object to be clamped. For its part, the second belt part in this case forms a fixing part which is configured to be fixed on a support. In fact, this second belt part 12 is in this case mounted on a support part 18, to which it is for example connected by screws, rivets or welding points 20, by its connecting branches 12' and 12". This support part 18 can form a strip or a support bracket or the like, fixed to a support element such as a part of a vehicle or vehicle chassis by any suitable means, for example by fixing lugs or screws 22.In this case, the second belt part 12 is fixed to the support 18 and has for this purpose lateral wings 12' and 12" which are folded in a direction moving away from the internal periphery of the belt to be fixed on fixing zones of the support 18.

[0057] In this case, the second belt part 12 has a generally V-shape, the branches of the V forming support portions on the object to be clamped. It is on these branches that the sheaths 16A and 16B are arranged.

[0058] As seen in particular in [Fig. 3], the clamping member comprises a clamping rod, for example a screw 14, which is retained relative to the first clamping end 12A by a retaining member such as a head 14A of the screw, and which is retained at the second clamping end 11A by a retaining member such as a nut 14B. The rod 14C of the screw passes through bores of the clamping ends, namely a bore 12A' of the first clamping end 12A and a bore 11A' of the second clamping end 11A (see [Fig. 3]).

[0059] Of course, the head 14A and the nut 14B could be reversed, or the clamping rod could be a rod threaded at both ends, cooperating at each of these ends with a nut. A different clamping member could also be designed, cooperating respectively with the two clamping ends and capable of being actuated to move them away from each other to tighten the collar by tightening means other than screwing.

[0060] It can be seen in particular in Figures 1 and 3 that the clamping member 14 is retained by relative to the first clamping end 12A via a spring 24 and a connecting piece 26. It is understood that, for tightening the belt around the object to be tightened, the tightening of the tightening member tends to move the connecting piece 26 relative to the first clamping end 12A against the elastic return effect of the spring 24. In this case, it is a compression spring which is arranged between an external face 12A" of the first clamping end and an internal face 26A of a bottom wall 27C of the connecting piece 26 which is opposite the external face 12A".

[0061] In this case, the connecting piece 26 forms a cage part in which the spring 24 is arranged. In particular, the spring is held between the aforementioned bottom wall 27C and the side walls 27A and 27B of this connecting piece.

[0062] It can also be seen in [Fig. 3] that the connecting piece 26 comprises a centering portion of the spring 24. In this case, the spring 24 is a helical spring and the bottom wall 27C of the connecting piece 26 has a central protruding portion 26A' which is configured to be engaged in the end 24A of the spring and thus forms a centering portion of the spring. A space for housing the turns of the spring is provided between the protruding portion 26A' and the internal faces, i.e. faces facing each other, of the side walls 27A and 27B.

[0063] The cage formed by the connecting piece has an external retaining surface which, in this case, is formed on the external face 26A" of the projecting portion 26A', this external face being the one opposite the spring 24. The bottom wall 27C has a bore 26' allowing the passage of the barrel 14C of the clamping rod 14. The external face of the bottom wall 27C forms, around the bore 26', a means for retaining the head 14A of the rod 14 or a nut cooperating with this rod.

[0064] The connecting part 26 also comprises an anti-rotation member making it possible to prevent the rotation of the clamping rod 14 relative to this part. In this case, the anti-rotation member is formed by a portion 270 of the external retaining surface. Indeed, the clamping head 14A may have one or more flats 14A', for example by being hexagonal or square. For its part, the external retaining surface 26A" may have edges 27C forming flats cooperating with the flat(s) of the head of the clamping rod to lock the latter in rotation. In this case, the projecting portion 26A' of the bottom wall 27C has axial wall elements 27C' which extend parallel to the axis of the clamping rod 14, towards the first clamping end 12A. The external faces of these wall elements cooperate with the flats of the head of the clamping rod to lock it in rotation.Depending on the dimensions of the spring and those of the clamping rod, the forward portion may have a shape giving it, in a first direction, dimensions adapted to those of the spring so that the forward portion is engaged in the spring by wedging it transversely and giving it, in a second direction and on its . opposite face, dimensions adapted to wedge the head of the clamping rod. For example, the forward portion may be rectangular and have a length, on its face facing the spring, adapted to the internal transverse dimensions of the spring and have a width, on its internal face receiving the head of the clamping rod, which wedges the latter in rotation.

[0065] Alternatively or additionally, it is possible to ensure that the head 14A of the clamping rod is forcibly engaged in the well formed by the projecting portion 26A', on the side opposite the first clamping end 12A, which not only allows it to be wedged in rotation, but also to be retained axially during the installation of the spring and the mounting of the connecting piece and the spring on the first clamping end 12A.

[0066] Overall, the connecting piece 26 in this case has a U-shape having two branches forming the side walls 27A and 27B previously mentioned, and a bottom forming the bottom wall 27C. In this case, this bottom wall itself has a projecting portion 26A' as indicated. The width of the connecting piece, measured transversely to the axial direction of the clamping rod, is smaller in the region of the projecting portion 26A' than in the branches 27A and 27B, and in the portion of the bottom wall 27C which is not projecting. This allows the projecting portion 26A' to be housed inside the turns of the spring 24, while ensuring that the spring is protected laterally over the entirety or almost the entirety of its width, by the side walls 27A and 27B forming the branches of the U.

[0067] Due to its U-shape, the connecting piece 26 can be plugged onto the first clamping end 12A so that this first clamping end passes between the two branches 27A and 27B.

[0068] [Fig.4] shows the connecting piece in a waiting position in which it holds the spring 24 opposite the first clamping end 12A, before clamping. Thus, in this situation, the belt 10 can be arranged around the object to be clamped by having completely separated the clamping rod 14 from the rest of the device, the assembly formed by the first end 12A of the belt, the connecting piece 26 and the spring 24 forming a homogeneous whole which remains assembled during the various manipulations carried out. However, this pre-assembly of the spring does not subsequently prevent the movement of the connecting piece relative to the first end of the belt during clamping.

[0069] To maintain the connecting piece 26 in the waiting position, the device may comprise a member for maintaining the waiting position, in particular a waiting clipping member. This member makes it possible to clip or pre-attach the connecting piece to the first clamping end 12A. In this case, the member for maintaining the connecting piece in the waiting position is formed on the side walls 27A and 27B of the connecting piece. We see in fact, looking in particular at figures 4 and 5, that, on the side opposite the bottom wall 27C, these side walls have internal hooking projections, internal projections carried by one of the walls, for example the wall 27A, projecting towards the other wall, for example the wall 27B. Here, "internal" means on the inside of the U formed by the connecting piece.

[0070] Thus, the side wall 27A comprises a first internal projection 28A and a second internal projection 29A offset from each other in the axial direction, which is here the direction of the axis of the spring and the axis of the clamping rod. In this case, the internal projection 28A is closer to the free end 27A' of the side wall opposite the bottom 27C than the projection 29A. In this case, these projections are formed by undulations projecting inwards from the clamping part. In this case, as seen in [Fig. 4], the end portions of the side walls 27A and 27B opposite the bottom 27C have axial cutouts between which tabs are thus formed which have inwards undulations forming the aforementioned projections 28A and 29A. For example, the free end portion of the side wall 27A has two marginal tabs 30A between which an intermediate tab 31A is formed.This intermediate leg 31A is only separated from the marginal legs 30A by longitudinal cutouts 31. The marginal legs 30A have inward corrugations which form the projections 28A and, at their free ends, are curved outwards. The intermediate leg 31A also has an inward corrugation 29A and is also curved outwards between this corrugation and its free end. The tops of the corrugations 28A are arranged on the same transverse line, perpendicular to the direction of the axis of the spring and are closer to the free end of the side wall 27A than that of the corrugation 29A.The configuration of the connecting piece 26 is symmetrical, and it is seen that the other side wall 27B has projections 28B and 29B forming undulations, similar to the undulations 28A and 29A, these undulations 28B and 29B being formed in external legs 30B and an intermediate leg 31B which extends between these external legs 30B.

[0071] When the connecting piece is inserted onto the first clamping end 12A, the undulations 28A and 28B form hard points which must be passed over to perform the insertion. Once these hard points have been passed over, the first clamping end 12A, formed here by a portion of strip, occupies the position P indicated in [Fig. 5]. It is understood that, in this situation, the connecting piece 26 is retained on this first end 12A with respect to an axial displacement, that is to say along the axis of the spring 24, by its location between, on the one hand, the undulations 28A and 28B and, on the other hand, the undulations 29A and 29B. This gives a stable waiting position in which the connecting piece 26 can be maintained. In [Fig.5], to facilitate visibility, the spring 24 has not been shown, but it goes without saying that it is then maintained in the connecting piece 26, in particular while then abutting against, on the one hand, the external face 12A" of the first clamping end 12A (see [Fig.3]) and, on the other hand, the internal face 26A of the bottom wall 27C of the clamping piece 26.

[0072] As indicated, the waiting position makes it possible to maintain the spring 24 at the first clamping end 12A. It also makes it possible to manipulate the clamping device to position it around the object to be clamped, even before the clamping member is in place and, in any case, before it is clamped. During these manipulations, the assembly formed by the connecting piece 26 and the spring 24 remains pre-assembled at the first clamping end 12A.

[0073] In this case, the connecting piece 26 is further capable of occupying a clamping threshold position which is reached by the clamping of the clamping member. Thus, the connecting piece is in its waiting position during the assembly and closing of the belt around the object to be clamped, then, during clamping, it passes from its waiting position to its clamping threshold position under the effect of the clamping of the clamping member.

[0074] The device may comprise a threshold mark to determine that the clamping threshold position has been reached. In this case, this threshold mark is formed by the undulation(s) 29A and 29B previously mentioned, which form hard points during clamping and which must be exceeded to reach the effective clamping phase. Here, "exceeded" means that, during clamping, the connecting piece 26 moves on the first clamping end 12A so that this first end reaches further towards its bottom wall 27C relative to the undulations 29A and 29B.

[0075] These undulations 29A and 29B form threshold clipping members, since their overshoot during tightening is similar to clipping or snapping. This threshold mark can be visible, by the fact that, when it is crossed, the intermediate tabs 31A and 31B on which the undulations 29A and 29B are formed tend to move away from each other. This constitutes a visual cue for the fitter, who can also easily see the fact that the first end 12A has actually passed the undulations 29A and 29B.

[0076] From the moment the threshold mark has been exceeded, tightening can be carried out up to the desired tightening level, taking into account the stiffness of the spring and its stress level (compression ratio for a compression spring as in the example shown). This threshold mark, in particular when it takes the form of a visual reference, is a simple and reliable means of ensuring that the desired tightening level is reached. This is an objective reference, it being noted that it is sometimes imprecise to base oneself on the tightening torque reached by the tool used for tightening because the measurement of this torque can be distorted by parameters unrelated to the actual tightening level obtained, such as possible friction of the tightening rod against the parts with which it cooperates and the coefficient of friction of the screwing elements. (rod and nut threads). The threshold mark can also be arranged so that, once it is exceeded, it is considered that the desired tightening value has been achieved.

[0077] Once the threshold mark has been exceeded and the clamping device has thus been clamped around the object, this device can accompany any expansions of the object that it is clamping because these expansions cause a displacement of the connecting part 26 relative to the first clamping end 12A, against the elastic return effect of the spring 24. The clamping threshold is exceeded in Figures 6 and 8, in which the first clamping end occupies the position P' indicated in [Fig.4].

[0078] For example, when this object is a hydrogen tank, the clamping device can be put in place while this tank is empty or practically empty, then this tank can be filled to the desired nominal position, which as indicated previously, can reach several hundred bars, on the occasion of which it expands and then requests the elastic clamping return permitted by the presence of the spring 24.

[0079] Alternatively, it may be provided that the connecting piece 26 is capable of occupying a maximum clamping limit position. This makes it possible to avoid stressing the various elements of the clamping device, and in particular the spring 24, beyond their elastic limit. In other words, this makes it possible to avoid plastic deformations which would be detrimental to the durability of the clamping.

[0080] The variant of [Fig.9] illustrates this possibility. It can be seen in this figure that the connecting piece 26 comprises, in addition to the various elements or components previously mentioned, maximum tightening stops 32A and 32B. In this case, these maximum tightening stops are formed by inward projections of the side walls 27A and 27B. In this case, these are tabs cut from the longitudinal edges of these side walls and folded inward (the inside here meaning the inside of the U formed by the tightening piece). Being formed on the edges of the side walls, these internal projections do not interfere with the spring 24. On the other hand, they are capable of coming into abutment against the external face of the first tightening end 12A of the belt in the maximum tightening position.

[0081] In [Fig.9], we also see the presence, on the side wall element 27C' of the projecting portion 26A' of the connecting piece, of a non-return element 27C" allowing, once the head 14A of the clamping rod 14 has reached position, at the bottom of the external face of the projecting portion, to oppose extraction of the screw. In a way, this non-return element 27C" forms a clipping member which must be passed over so that the head of the screw reaches position. This non-return element could of course be provided in the other figures.

[0082] Returning to the previous figures, in particular to figures 3 and 4, we see that the bore 12A' of the first clamping end 12A through which the clamping rod passes may be oblong, so as to allow the movement of this rod relative to the first clamping end, when tightening the clamping device. The various constituent elements of the belt may be made from flat metal strips. In particular, in the region in which it cooperates with the connecting piece 26, the first clamping end 12A forms a flat strip which, once the connecting piece is pre-attached to it, constitutes a wall element opposite the bottom wall 27C of this connecting piece.

[0083] The second tightening end of the belt 11A has, as mentioned, a bore 11A' allowing the passage of the tightening rod. This bore 11A' can also be oblong to allow the rod to move relative to this second end. In this case, the belt portion 11 is formed in a strip, in particular a metal strip and this second tightening end 11A can be locally reinforced. To do this, a free end portion of the strip in which the belt part 11 is formed is folded back on itself and is folded down so as to provide the end 11A with a double thickness in which the opening 11A' is made.

[0084] Furthermore, in this zone, this end 11A forms a concave ear for housing a spacer 32 at the rear of which the nut 14B is located. This spacer has a passage 32A which can be crossed by the clamping rod 14. The spacer can be formed from a strip of metal wound on itself and cut locally to form the passage 32A. In this case, the spacer 32 has an external cradle shape with a convexity matching the concavity formed on the external face of the clamping end 11A. Means for retaining and wedging the spacer in rotation relative to this first end can be provided. In this case, the edge of the passage 32A has tabs 34 folded so as to project beyond the front face of the spacer, facing the external face of the clamping end 11A.These tabs 34 are thus placed in the opening 11 A' so as to cooperate with the edge of this opening to wedge the spacer relative to them. The spacer 32 can be hollow, being formed in a strip wound on itself. In this case, the joint plane of the ends of this strip is formed on the front face of the spacer, the tabs 34 are produced on the edges of this joint plane. The front opening of the passage 32A formed in the front face of the spacer is therefore formed by a cutout 33 in the edges of the strip in which the spacer is formed. On the other hand, the rear opening of the passage 32A located in the rear face of the spacer can be formed by a circular or oval cutout 33'.

[0085] [Fig. 10] will now be described, which illustrates an alternative embodiment for the part connecting piece. In this figure, the same references are used as in the previous figures, increased by 100 to designate the connecting piece and its various elements.

[0086] The connecting piece 126 also has a U-shape, with a bottom wall 127C and two side walls, 127A and 127B. Like the connecting piece 26, it forms a cage portion for the spring. The connecting piece 126 is distinguished from the connecting piece 26 by two aspects, namely, on the one hand, a slightly different conformation of its bottom wall and, on the other hand, the presence of particular visual cues for the threshold mark.

[0087] With regard to the bottom wall 127C, the centering portion of the spring is formed by a projecting portion 126A' which has a bore 126' for the clamping rod. In this case, this projecting portion 126A' is formed in a central portion of the bottom wall 127C all around which the rest of the bottom wall remains. Thus, the part of the bottom wall which is not projecting is present not only between the projecting portion 126A' and the side walls 127A, 127B as in the example of the preceding figures, but also on the sides of the projecting portion, by marginal portions 127C" which extend, on either side of the projecting portion 126A', from one to the other of the side walls 127A, 127B. Here, the projecting portion is separated from these marginal portions 127C" by cutouts in the bottom wall and is pushed back, for example by stamping, to be projecting.The edges of the cutout or the axial wall elements 127C' of the external surface of the projecting portion 126A' can serve as anti-rotation members for the clamping rod, in particular when, as in the example shown, these edges or these wall elements have flats.

[0088] Of course, it is possible to produce the projecting portion by a stamping without cutouts on its sides but pierced at its bottom to allow the passage of the clamping rod. The geometry of this stamping or its dimensions can then make it possible to achieve an anti-rotation function for the clamping rod. For example, the external surface of the stamping can have one or more flats or else locally define transverse dimensions requiring forceful engagement of the head of the clamping rod in the stamping.

[0089] As regards the visual markers, the connecting piece 126 has at least one line, notch or the like, present on at least one of the side walls 127A, 127B, in this case on its edge, this line, notch or the like forming a visual marker. The operator checking the tightening of the belt can thus check that the first tightening end 12A has reached the level of the visual marker(s). For example, two visual markers 125 can be provided spaced apart by a distance corresponding to the thickness of the band of the first tightening end. Of course, such visual cues may be provided on the connecting piece 26 previously described.

[0090] [Fig. 12] shows another variant which relates on the one hand to the clamping threshold and, on the other hand, to the visual reference of this threshold.

[0091] In [Fig. 12], the same references are used as in Figures 1 to 9, increased by 200 to designate the elements of the connecting piece. For the sake of simplification, [Fig. 12] shows only one of the side walls 227A of the connecting piece. The two side walls of the connecting piece are similar to each other and its bottom wall can be similar to that of the connecting piece 26 or to that of the connecting piece 126.

[0092] In the preceding figures, two internal projections 29A and 29B, in this case formed by undulations, are provided on the side wall 27A and the connecting piece is held in the waiting position at the first clamping end 12A by the positioning of this first end between these two projections, then the clamping threshold is reached when the positioning of this first end exceeds the projection 29A towards the bottom wall of the connecting piece. Here, the clamping threshold position is therefore very close to the waiting position.

[0093] It may happen that it is necessary to have a greater clamping amplitude from the pre-assembled position, which implies that the amplitude of the movement of the connecting piece relative to the first clamping end is greater. Thus, in [Fig.l 1], it is a third projection 229'A which defines the clamping threshold. The side wall 227A therefore has two projections 228A and 229A respectively similar to the projections 28A and 29A and positioned so as to define between them the retaining position of the connecting piece, and a third projection 229'A, located closer to the bottom (of the retaining wall) than the second projection 229A, and it is when, due to the movement of the connecting piece under the effect of the clamping, the first clamping end 12A exceeds this third projection, that the clamping threshold is reached.Here, the projections 228A, 229A and 229'A are formed by undulations towards the inside of the connecting piece, like the projections of the previous example. In this case, these projections are present on separate legs and two marginal legs 230'A are shown, each provided with a undulation 229'A, two intermediate legs 230A each provided with a undulation 228A and a central leg 231A provided with the undulation 229A. However, a different number of legs could be provided and, for example, the undulations 229A and 229'A or the undulations 228A and 229'A could be produced on the same leg.

[0094] Furthermore, [Fig. 12] shows another variant of the visual clamping threshold marker. This is in this case a window 225' made in the side wall 227A and allowing the operator to check from outside the connecting piece that the first clamping end 12A has indeed reached the clamping threshold position. tightening, in this case defined by the passage behind the undulations 229'A.

[0095] Of course, the variant which has just been described with reference to [Fig. 12] can be implemented for the connecting piece 26 or 126.

[0096] Another aspect of the disclosure will now be described, which relates to the articulation between the two belt parts 11 and 12. The second end 12B of the second belt part 12 has a retaining zone 40 relative to which the second end 11B of the first belt part is pivotally retained by a pivot axis 42.

[0097] This is particularly visible in Figures 1, 2, 6 and 8. In this case, the retaining zone 40 comprises a slot 44 into which the second end 11B of the first belt part 11 is inserted. In this case, this retaining zone also has a fold and therefore provides, on the external face of the second belt part 12, a bearing for the rotation of the pivot axis 42. Two portions of the second end of the second belt part can thus be distinguished on either side of the folded zone 12B', these two portions being respectively identified 112 and 112' in [Fig.8]. In this case, due to the fold at 12B', these two portions are inclined relative to each other, forming an angle of the order of 60° between them. This angle could be different, but it is preferably less than 90°, for example in the order of 40° to 70°.The slot 44 extends into these two portions 112 and 112' so as to allow the free pivoting of the second end 11B of the first belt part 11 relative to it. Indeed, depending on the pivoting angle, the free end portion 11B' of this first end emerges from the slot, in one or other of the portions 112 and 112'.

[0098] The slot 44 in which the end 11B of the first belt part 11 is inserted is oriented perpendicular to the general orientation of the first belt part 11 in its running part (the running part being that which can come into clamping contact with the object to be clamped). Indeed, the direction of the width of this slot, in which its smallest dimension is observed, is transverse relative to the general orientation of the strip portions which constitute the first and second belt parts.

[0099] The first belt part 11 has a torsion zone 50 (see [Fig. 6]) bringing the second end 11B of the first belt part 11 substantially at a right angle to a running part of this first belt part. In other words, the strip portions forming the first belt part are oriented substantially at a right angle to each other, on either side of the torsion zone 50. The pivot axis 42 is perpendicular to the second end 11B of the first belt part which is inserted into the slot 44. As can be seen in particular in [Fig. 6], the pivot axis 42 is engaged in a drilling 43 of the second end 11B of the first belt part, this drilling being made in the free end portion 11B' which is located on the other side of the torsion zone 50 relative to the second end 12B of the second belt part 12.

[0100] In this case, the second end 1 IB of the first belt part has a longitudinal fold 51 according to which two halves of strip 51A and 5 IB of the first belt part 11 are brought against each other. This fold 51 extends from the torsion zone 50 to the free end of the second end 1 IB of the first belt part 11. Thus, in its zone inserted into the slot 44, this end 1 IB has a double thickness formed by the strip portions 51A and 51B brought against each other. The mechanical resistance is thus locally increased, in particular for retaining the axis 42 in the aforementioned bore 43.

[0101] As seen in [Fig. 6], provision may be made to retain these two halves of strip 51A and 51B pressed against each other by retaining means such as welding or clinching. For example, welding or clinching points 54 are shown in [Fig. 6] extending on either side of the slot 44 once the end portion 11B' is inserted into this slot 44. To delimit the torsion zone 50 and prevent this torsion zone from propagating into the current part of the first belt part 11 under the effect of the tightening tension forces, the latter may have a boss 56 located on the other side of the torsion zone 50 relative to its second end 11B. In a way, this boss 56 forms a stop to the torsion. In this case, it extends transversely, from one side to the other across the width of the strip in which the first belt part 11 is formed.However, the boss could be more localized and simply interfere with the end of the fold 51 opposite the free end of the first belt part. The pivot axis 42 can be force-engaged in the opening 43 so as to remain in position in this opening.

[0102] Of course, this articulation can be implemented independently of the aspects which have been described concerning the first ends 11A and 12A of the belt, relating in particular to the connecting piece 26 and the spring 24. It is noted that the articulation thus produced is particularly mechanically resistant. It is located in a region of the belt which is not intended to be in direct contact with the object clamped by this belt, the contact zones being in this case defined by the sheaths 16, 16A and 16B which have been described. Thus, the torsion zone has no negative impact on the quality of the clamping and does not risk damaging the clamped object.

[0103] Figures 12 and 13 show a variant for the articulation between the two belt parts 11 and 12. Here, the retaining zone 40 of the second end 12B of the second belt part 12 comprises two slots 144 and 144' which extend into the portions 112 and 112' of the folded zone 12B', and the second end 11B of the first belt part 11 has two parallel end tabs 11 IB and 11 IB' respectively inserted into the slots.

[0104] The slots 144 and 144' are parallel to each other and are oriented perpendicular to the general orientation of the first belt part 11 in its current part.

[0105] The first belt portion 11 has a torsion zone 150 and a longitudinal cutout 150'. The cutout 150' separates the end portion of the end 11B into the two legs 11 IB and 11 IB'. This cutout 150' extends from the free end of the end 11B to a stopping point 150". This stopping point may have a conformation intended to prevent the propagation of the cutout 150' under the effect of the tightening tension, this conformation being for example a small circular cutout and / or a stamping or a local work hardening.

[0106] The torsion zone 150 is formed between the stopping point 150" and the free end of the end 1 IB and comprises two twists respectively made on each of the legs 11 IB and 11 IB' to bring each of these legs substantially at a right angle relative to the current part of the first belt part 11. The pivot axis 42 is perpendicular to the ends of the legs 11 IB and 11 IB' engaged in the slots 144 and 144' and is engaged in holes in these ends.

[0107] It can be seen in [Fig. 13] that these holes can have collars 111' formed by the edges of the holes of the legs 111B and 111B' pushed laterally, that is to say parallel to the pivot axis 42, for example outwards. These collars locally increase the mechanical resistance to forces.

[0108] A similar collar may also be present on the edge of the bore 43 of [Fig.6]

[0109] This variant for the articulation can also be implemented independently aspects which have been described concerning the first ends 11A and 12A of the belt, relating in particular to the connecting piece and the spring.

Claims

Claims

1. Device for clamping an object, comprising a belt 10 having at least a first and a second clamping end (1 IA, 12A) and a clamping member (14) which connects the two clamping ends by being retained relative to the latter so that the tightening of the clamping member moves the first and second clamping ends relative to each other by tightening the belt, the clamping member (14) being retained relative to at least the first clamping end (12A) via a spring (24) and a connecting piece (26), so that the tightening of the clamping member tends to move the connecting piece relative to the first clamping end against the elastic return of the spring, the connecting piece (26) being able to occupy, relative to the first clamping end (12A), a waiting position in which it holds the spring (24) with respect to the first clamping end.

2. Device according to claim 1, comprising a member for holding the connecting piece in the waiting position (28A, 29A, 28B, 29B), in particular a waiting clipping member.

3. Device according to claim 1 or 2, wherein the connecting piece (26) is capable of occupying a clamping threshold position which is reached by the clamping of the clamping member.

4. Device according to claim 3, comprising a threshold mark (29A, 29B) for determining that the clamping threshold position has been reached, the threshold mark comprising in particular a threshold clipping member.

5. Device according to one of claims 1 to 4, in which the connecting piece (26) is capable of occupying a maximum tightening limit position, the device optionally comprising a maximum tightening stop (32A, 32B).

6. Device according to one of claims 1 to 5, in which the connecting piece (26) forms a cage part in which the spring (24) is arranged, the connecting piece optionally having a portion (26A1) for centering the spring (24).

7. Device according to claim 6, in which the clamping member (14) comprises a clamping rod and the cage portion formed by the connecting piece (26) has a retaining surface (26A") against which a retaining element of the clamping rod, such as a head (14A) is retained. of said rod, said retaining surface optionally comprising an anti-rotation member (27C') of the clamping rod (14) and being optionally located on an external face of the centering portion (26A1) of the spring (24).

8. Device according to one of claims 1 to 7 taken in combination with claim 2, in which the connecting piece (26) has a U shape having two branches (27A, 27B), the connecting piece being plugged onto the first clamping end (12A) so that this first clamping end passes between the two branches, the member for holding the connecting piece in the waiting position (28A, 29A, 28B, 29B) comprising at least one holding projection projecting on the internal face of at least one of the two branches.

9. Device according to one of claims 1 to 8 taken in combination with claim 4, in which the connecting piece (26) has a U shape having two branches (27A, 27B), the connecting piece being plugged onto the first clamping end (12A) so that this first clamping end passes between the two branches, the threshold mark (29A, 29B) comprising a reference projection projecting on the internal face of at least one of the two branches.

10. Device according to one of claims 1 to 9 taken in combination with claim 5, in which the connecting piece (26) has a U shape having two branches (27A, 27B), the connecting piece being plugged onto the first clamping end (12A) so that this first clamping end passes between the two branches, at least one of the two branches having a maximum clamping stop projection (32A, 32B).

11. Device according to one of claims 1 to 10, in which the clamping member comprises a clamping rod (14) which is retained relative to the second clamping end (11 A) of the belt (10) by a nut (14B).

12. Device according to one of claims 1 to 11, wherein the belt (10) comprises a first belt part (11) of which a first end (1 IA) forms one of the first and second tightening ends and a second belt part (12) of which a first end (12A) forms the other of the first and second tightening ends, said second belt part forming a fixing part configured to be fixed on a support (18).

13. Device according to one of claims 1 to 12, in which the belt (10) comprises a first belt portion (11) of which a first end (1 IA) forms one of the first and second tightening ends and a second belt portion (12) of which a first end (12A) forms the other of the first and second tightening ends, the second ends (11B, 12B) of the first and second belt portions being connected by a hinge.

14. Device according to claim 13, wherein the second end (12B) of the second belt part (12) has a retaining zone (40), relative to which the second end (11) of the first belt part (11) is pivotally retained by a pivot axis (42), the retaining zone comprising in particular a slot (44; 144,144') into which the second end (11B) of the first belt part (11) is inserted.

15. Device according to claim 14, wherein the first belt part (11) has a torsion zone (50; 150) bringing the second end (1 IB) of the first belt part substantially at a right angle to a running part of the first belt part, the pivot axis (42) being perpendicular to said second end of the first belt part, in particular by being engaged in a bore (43) of the second end (1 IB) of the first belt part (11), this bore optionally having a collar (111').

16. Device according to claim 15, in which the second end of the first belt part has a longitudinal fold (51) according to which two strip halves (51 A, 51 B) of the first belt part (11) are brought against each other, optionally being held pressed against each other, for example by welding or clinching (54).

17. A device according to claim 15 or 16, wherein the first belt portion has a boss located on the other side of the torsion zone relative to the second end of the first belt portion.

18. Device according to one of claims 14 to 17, in which the second end (1 IB) of the first belt part (11) has two parallel tabs (111B, 11 IB') each inserted into a slot (144, 144') of the retaining zone (40).

19. Device according to claim 18, in which the two legs (111B, 111B') are separated by a cutout (150') and the second end (11B) of the first belt part (11) has an area torsion (150) comprising two twists each bringing the legs substantially at right angles to a running portion of the first belt portion.

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