WO2019158888A1

WO2019158888A1 - Device for assembling two parts comprising a resilient return device

Info

Publication number: WO2019158888A1
Application number: PCT/FR2019/050376
Authority: WO
Inventors: Christophe Casteras; Frédéric Martin
Original assignee: Centre National d'Études Spatiales; Clix Industries
Priority date: 2018-02-19
Filing date: 2019-02-19
Publication date: 2019-08-22
Also published as: FR3078117A1; FR3078117B1

Abstract

The invention relates to a device for assembling a first part on a second part (30), said device comprising: at least two jaws (2, 6), said jaws being supported by the first part, such that the jaws can be placed in a closed position, in which the jaws (2, 6) engage with a portion of the second part so as to prevent a separation, in at least one direction and in at least one sense, of said portion of the second part relative to the jaws, and can be placed in an open position, in which the jaws allow separation of said portion, a device (25) for retaining the jaws in the closed position adapted to be able to be broken by melting, characterised in that it comprises a resilient return device adapted to be able to resiliently return said jaws to the open position.

Description

DEVICE FOR ASSEMBLING TWO PARTS COMPRISING A

ELASTIC RECALL DEVICE

The invention relates to a device for assembling a first part to a second part, said assembly device comprising at least two jaws adapted to maintain said second part.

The invention relates more particularly to an assembly device adapted to be able to maintain and then release said second part.

Such devices are used in various fields and in particular have applications in the spatial field, in particular for nano-satellites and more particularly for the release of any device (deployable arm, instruments, antennas, etc.). Many terrestrial applications are also possible such as products having an appendage or a deployable structure.

There is already known a mechanism comprising a rod held between two halves of the same coil assembled by a wire wound around said coil. The wire wound around said coil is connected to a fuse which melts when sufficiently supplied with electric current. When the fuse is broken, the separation of the two halves of the coil is allowed and the rod can be released.

However, such a mechanism requires that the part to be released connected to the rod exerts sufficient traction to allow the effective release of the part. In addition, in order to be totally free of such a mechanism, the rod must follow a displacement in translation in the cylinder formed by the two halves of the coil, which is likely to delay its release or even to prevent it in certain case.

The invention therefore aims to provide a two-piece assembly device to overcome the disadvantages of known assembly mechanisms.

The invention also aims at providing such a device for limiting the mass and bulk compared to known assembly devices. The invention also aims at providing such a device having a simplicity of manufacture and a manufacturing cost lower than the cost of manufacturing known assembly devices.

The invention also aims at providing such a device that can be used several times.

The invention also aims to propose such a device that can be the subject of numerous variants, and compatible with many applications, including in the space and aeronautics.

The invention also aims to provide such a device that allows a faster release of the selected part relative to the known assembly devices.

The invention also aims to provide such a device that allows a complete release and without risk of interference between the two parts, regardless of their relative movements.

The invention also aims at providing such a device which makes it possible to limit or even eliminate the relative forces between the two parts.

The invention therefore relates to a device for assembling a first part to a second part, said device comprising:

at least one first jaw and at least one second jaw, said jaws being carried by the first piece, at least one of the two jaws being guided relative to the first piece so that the jaws can be placed:

in the closed position, in which the jaws cooperate with a portion of the second piece so as to prevent spacing, in at least one direction and in at least one direction, from said portion of the second piece with respect to the jaws,

o in the open position, in which the jaws allow a spacing of said portion of the second piece relative to said jaws, - A jaw holding device in the closed position, said holding device being controlled release and adapted to be broken by fusion,

characterized in that it comprises a resilient return device of said jaws adapted to elastically recall said jaws in the open position.

Thus, the invention makes it possible, for the first time, to obtain an assembly device that not only makes it possible to operate a reliable and resistant assembly when the jaws are in the closed position, but also allows a quick and reliable release of the jaws. this when necessary, the opening of the jaws being performed by an elastic return device for returning the jaws to the open position. In addition, such an assembly device does not prevent the conservation of at least one degree of freedom on the connection connecting the second part to the first part. An assembly device according to the invention allows, in the closed position, to prevent spacing or bringing the second piece closer to the jaws beyond a certain distance, this spacing or this approximation being allowed in the open position. after rupture of the jaw holding device.

Various embodiments can be envisaged with regard to the movements prevented in the closed position and allowed in the open position. In certain embodiments according to the invention, in the closed position, said jaws cooperate with said portion of the second piece so as to limit the relative displacements between said portion and said jaws in the direction of a spacing increase of at least in a direction between said first piece and said second piece.

Various embodiments can be envisaged with regard to the elastic return device of the jaws in the open position. The elastic return device may comprise a helical spring, a leaf spring, a spiral spring or resilient blades bending. In certain embodiments in accordance with the invention, the elastic return device comprises at least one first blade and at least one second flexural resilient blade and fixed to said first piece, the first jaw being attached to said first piece. first blade in at least one attachment point and the second jaw being fixed to said second blade in at least one attachment point, each jaw attachment point to a blade being spaced longitudinally along said blade relative to the at least one point of attachment of said blade to the first piece. The point of attachment of the first jaw to the first blade is offset longitudinally along said first blade relative to the point of attachment of said first blade to the first piece, and likewise the point of attachment of the second blade to the second blade is longitudinally offset along said second blade relative to the attachment point of said second blade to the first piece.

Various embodiments can be envisaged with regard to the device for holding the jaws in the closed position. It may especially take the form of a wire, a bundle of son, a unidirectional clamp (such as for example commonly called Ty-rap® marketed for example by Thomas & Betts® (Cary, USA)) , a sleeve (woven or not) ... In some embodiments according to the invention, said holding device comprises at least one wire of thermoplastic polymer material which is adapted to be broken by fusion. It may be a single wire or a bundle of wires, possibly woven between them. The assembly device according to the invention may for example comprise a microcontroller for controlling the breaking of said holding device at at least one point so as to release the second part of the jaws.

In certain embodiments in accordance with the invention, the material forming said holding device is chosen from the group consisting of polymeric materials having a melting point of less than 300 ° C., especially a melting point of between 0 ° C. and 280 ° C. ° C, in particular in the group consisting of polypropylenes (PP), polyethylenes (PE) (for example Dyneema® marketed by DSM® (Heerlen, the Netherlands) ("UHMNPE" or ultra-high molecular weight polyethylene)) polyaramids (for example Kevlar® marketed by DuPont® (Midland, USA)), polyamides, polyesters, their composites and mixtures thereof. In certain embodiments according to the invention, the assembly device comprises at least one heating device adapted to be able to melt break said holding device. It may for example be a heating device (sometimes called a "heating knife") formed of a wire (for example a wire such as an alloy of nickel and chromium) or a metal plate adapted to to be able to reach a predetermined temperature at least equal to the melting temperature of the material forming said holding device to be broken. The heating device comprises in particular an electrically conductive material adapted to be heated by the Joule effect (P = RI ² in the DC regime, P representing an electrical power, R the electrical resistance of the heating device and I the electrical intensity). when it is electrically connected to both terminals of a generator.

Various embodiments may be envisaged with regard to the connection connecting the second part to the first part via the assembly device according to the invention. The second piece can be held by the jaws in the closed position so as to be held by a connection selected from the group consisting of complete links (without any degree of freedom, also called embedding), pivot links (free rotation around a axis), sliding pivot links (allowing rotation and translation), ball joints (center point connections which can be likened to three perpendicular axes pivot connections), slide links (allowing translation), bearing connections plane (allowing one rotation and two translations), straight linear links (allowing two rotations and two translations), annular linear links (allowing three rotations and a translation) and point links (allowing three rotations and two translations). In some embodiments according to the invention, in the closed position, said second part is rotatable relative to the jaws. This has the advantage of allowing to maintain the assembly between the first and the second part while allowing certain displacements of the second part with respect to the first part to which it is connected, for example to allow rotation orientation of panels solar related to a satellite. In some advantageous embodiments according to the invention, the second piece is connected to the first piece by a ball joint (that is to say allowing rotations at least partly around three fixed axes of a base).

Each blade may be formed of at least one material selected from the group consisting of metallic materials, polymers (in particular thermoplastic or thermosetting polymers) and composite materials (in particular among polymer matrix composite materials). In particular, in certain embodiments in accordance with the invention, the blades are rigid in traction (that is to say substantially non-deformable in longitudinal traction and at least less deformable in tension than in flexion). The blades are resistant in longitudinal traction (in the closed position and in the open position of the device) so that they are adapted to withstand tearing with respect to the first part (spacing of the two parts) and the jaws . In particular, the blades are sufficiently rigid in tension, so that it is not necessary to provide longitudinal tensile stops (that is to say stops to prevent the spacing of the second piece screws to the first room). In a variant, nothing prevents the provision of tensile stops in the direction of a separation of the second part from the first part, for example by providing projecting abutment elements of said blades adapted to cooperate with at least one another element of conjugated form of said abutment elements of said base.

Various embodiments can be envisaged with regard to the attachment of the blades to the first part. The blades can be fixed directly (eg with screws) to the first part or be attached to a base itself attached to the first part.

In some embodiments according to the invention, the assembly device comprises a base carried by the first part and to which the blades are fixed. In some embodiments according to the invention, the assembly device comprises a base carried by the first part, said base comprising:

a first branch to which is fixed the first blade, said first branch having at least one curved portion, said first blade being adapted to be pressed against said curved portion of the first branch in the closed position, and

a second branch to which is fixed the second blade, said second branch having at least one curved portion, said second blade being adapted to be pressed against said curved portion of the second branch in the closed position.

Said base can be an integral part of the first part (resulting for example from a simultaneous molding and forming a single piece with the first part) or be reported and fixed to the first part by any suitable method of attachment (gluing, screwing, bolting ...).

Nevertheless, in certain advantageous embodiments according to the invention, the assembly device comprises a base devoid of such branches and being in another form, said base having fastening means to the first part. It can for example be a circular base or a tray.

In certain embodiments in accordance with the invention, said base has at least one face, called the contact face, adapted to be in contact with said second part in the closed position, said contact face being adapted to act as a stop in compression in the direction of a rapprochement of said portion of the second piece relative to the first piece. The base may for example comprise a tongue forming such a stop capable of transmitting the compressive forces and / or traction exerted by the second piece and / or by the jaws on the base.

In some embodiments according to the invention, each blade having a longitudinal direction, the first jaw is attached to a longitudinal end of the first blade and the second jaw is attached to a longitudinal end of the second blade. However, nothing also prevents the blade is extended beyond each jaw or in other words that each jaw is attached to an area of the blade separate from one end of the blade. In some embodiments according to the invention, each blade is elastically deformable at least by bending about an axis orthogonal to said longitudinal direction of said blade.

In certain embodiments according to the invention, in the open position, and in particular in an open position corresponding to a rest position of said device, the longitudinal direction of the first blade is substantially parallel to the longitudinal direction of the second blade.

In some embodiments according to the invention, a longitudinal end of the first blade is fixed to said first part, said longitudinal end being distinct from the longitudinal end of the first blade to which the first jaw is attached and, at one end longitudinal section of the second blade is fixed to said first piece, said longitudinal end being distinct from the longitudinal end of the second blade to which is fixed the second jaw. Thus, there is at least a portion of the length of each blade which is free to be deformed in bending at least between the closed position of the jaws and an open position in which the jaws are further apart than in the closed position.

In some embodiments according to the invention, in the closed position, said jaws form a housing for receiving said second piece, said receiving housing having a conjugate shape of the second piece.

The invention also relates to an assembly device and method characterized, in combination or not, by all or some of the characteristics mentioned above or below. Whatever the formal presentation given, unless expressly stated otherwise, the various characteristics mentioned above or below must not be considered as closely or inextricably linked together, the invention may relate to only one of those structural or functional features, or only some of these structural or functional features, or only part of one of these structural or functional features, or still any grouping, combination or juxtaposition of all or part of these structural or functional characteristics.

Other objects, features and advantages of the invention will appear on reading the following non-limiting description of some of its possible embodiments and which refers to the appended figures in which:

FIG. 1 is a schematic side view of an assembly device according to a first embodiment according to the invention in the closed position,

FIG. 2 is a schematic view from above of an assembly device according to the first embodiment according to the invention in the open position,

FIG. 3 is a schematic side view of an assembly device according to a second embodiment according to the invention in the closed position,

FIG. 4 is a schematic view from above of an assembly device according to the second embodiment according to the invention in the closed position,

FIG. 5 is a diagrammatic bottom view of an assembly device according to the second embodiment according to the invention in the closed position,

FIG. 6 is a schematic perspective view of an assembly device according to the second embodiment according to the invention in the open position,

FIG. 7 is a schematic perspective view of an assembly device according to the second embodiment according to the invention in the open position,

FIG. 8 is a schematic side view of an assembly device according to a third embodiment according to the invention in the closed position,

FIG. 9 is a schematic view from above of an assembly device according to the third embodiment according to the invention in the open position,

FIG. 10 is a diagrammatic side view of an assembly device according to a fourth embodiment according to the invention in the closed position, FIG. 11 is a schematic view from above of an assembly device according to the fourth embodiment according to the invention in the open position,

- Figure 12 is a schematic perspective view of an assembly device according to the second embodiment of the invention with a support.

An assembly device as shown in FIGS. 1 to 7 comprises two jaws 2, 6 fixed to a first part 45 by means of blades 10, 12. The first part is the part on which the device is fixed. assembly, it may for example be a satellite, including a nano-satellite, or any other piece for land use, aeronautical or space to which it is desired to temporarily fix another room. The assembly device makes it possible to assemble at least one momentarily this first part to a second part which can for example be a deployable device or only a part making it possible to connect said assembly device to a deployable device such as in the example shown wherein the second piece is a piece 30 for connecting the assembly device to a part to be released. Such a piece may therefore have a means of attachment to a part that is desired momentarily to bind to said first piece. In the example shown, the part 30 comprises a hexagonal head 36.

Each blade 10, 12 has a longitudinal direction corresponding to the largest dimension of each blade in the rest position. The first jaw 2 is fixed at one longitudinal end of the first blade 10, the other longitudinal end of the first blade 10 being fixed to the first piece. The second jaw 6 is fixed to a longitudinal end of the second blade 12, the other longitudinal end of the second blade 12 being fixed to the first piece. The jaws can be fixed to the longitudinal ends of the blades by any suitable method of attachment such as by gluing. In the closed position, the longitudinal ends of the same blade are oriented to form a right angle between them in the embodiments shown. However, nothing precludes the provision that they form an angle less than or greater than 90 ° between them, nor that the two blades form an identical angle with respect to the face of the first piece to which the blades are fixed. Other orientations are possible in particular if the first piece does not have a flat face.

The blades in the closed position intersect as can be seen by a side view of the device (Figure 1). The rotation operated by the blades and the jaws during the opening of the assembly device is therefore not performed in the same direction of rotation for the two blades. However, it is not essential that the blades intersect (while being laterally offset from each other so as not to interfere with their opening / closing) and other configurations are possible.

The first jaw 2 is attached to the first blade 10 and the second jaw 6 is attached to the second blade 12. Each jaw attachment point to a blade is longitudinally offset along said blade 12 relative to the blade point. fixing the blade to the first piece. The portion of each blade that is attached to the first piece is substantially parallel to the surface of the first piece on which the blades are attached. In the closed position of the jaws, the longitudinal end of each blade to which a jaw is attached is substantially normal to the surface of the first part on which the blades are fixed. In the closed position, the central portion of each blade (between one end to which is attached a jaw and the other end of said blade fixed to the first piece) is curved and in particular whose longitudinal section is in the form of a circular portion.

Each blade 10, 12 may be formed of at least one material selected from the group consisting of metallic materials, polymers (in particular thermoplastic or thermosetting polymers) and composite materials (in particular polymeric matrix composite materials). The material forming each plate may for example be chosen from thermoplastic polymers: polyethylenes, polypropylenes, polyethylene terephthalates (PET), polystyrenes, polycarbonates, polyethers, polyether ketones; or thermosetting: polyester resins, epoxy resins, phenolic resins, polyimide resins, cyanate ester resins and melamine resins. The material forming each blade may also be chosen from the composite materials, in particular composite materials with a polymer matrix (thermoplastic or thermosetting) within which at least one reinforcement such as particles (mineral, ceramic or metal) extends, fabrics of synthetic fibers (carbon fibers, fibers glass fibers, aramid fibers, boron fibers, etc.), synthetic fiber yarns (polyamide fibers, polyester fibers, polyethylene fibers, chlorofibres, acrylic fibers, polypropylene fibers, polyurethane fibers, etc.), metal fibers, beryllium fibers, ceramic fibers, cellulosic fibers and mixtures thereof. The material forming the blades 10, 12 is chosen and the blades 10, 12 are shaped to be able to present a tensile strength and especially a tear resistance so as to transmit the tensile forces between the first piece and the second. piece, or between the piece 30 and the first piece 45, so that it is not necessary to provide longitudinal tensile stops preventing separation of the piece 30 vis-à-vis and the first piece 45. Such tensile stops preventing spacing of the workpiece 30 from and to the first workpiece 45 may, however, also be provided.

The jaws 2, 6 have a generally parallelepipedal shape, one of the faces of which is pressed to one of the blades 10, 12 and whose face opposite to this, said receiving face of the second piece, is adapted to be arranged in view of the head 36 of the part 30 to maintain and possibly in contact with the head 36 in the closed position. In the embodiments shown, the receiving face of the second piece has a concave face adapted to receive at least a portion of the head 36 of the piece 30. In the closed position, the jaws 2, 6 provide a receiving housing of the piece 30, said receiving housing having a conjugate shape of the part 30. The part 30 comprises a spherical portion 32 connected to the attachment head 36 by a rod 34. This allows a ball-type connection to be formed between the first and the second piece in the closed position.

The first jaw 2 has two projections 4 adapted to form lateral stops in the closed position of the device, these projections coming into contact with a central tongue 8 of the base 1 1. The central tongue 8 of the base 1 1 can also form a stop forming a lower support for the spherical portion 32 when it is retained between the two jaws 2, 6. The central tongue 8 thus forms a stop capable of transmitting the compressive forces and / or traction exerted by the piece 30 and the jaws 2, 6 on the base.

In the closed position the two jaws 2, 6 are in contact with each other or are very slightly spaced apart from one another so as to provide a clearance to prevent any disruption of the movement of the jaws during their opening.

The assembly device comprises a controlled release holding device in the form of a wire 25 of polymeric material having a melting temperature of less than 300 ° C, in particular less than 250 ° C. This is for example a wire or a ribbon formed of polyethylene (PE), for example Dyneema® marketed by DSM® (Heerlen, the Netherlands). A bundle of wire, a cable, a sleeve or a ring of fuse material could also be used in addition to or instead of the fuse wire.

A heating device adapted to break the melt holding device is arranged to be in contact with said wire 25 or to come into contact with it when it is desired to control the opening of the jaws of the assembly device. It may be an electrically conductive wire 50 (formed for example of nickel-chromium alloy), the temperature of which can at least reach the temperature at which the wire 25 can be broken by melting so as to release the assembly, for example when it is supplied with electric current. An electric power source may thus be provided or a means for connecting said heating device to an electrical source present within the first part or the second part. Several heating devices may be provided for safety and / or to accelerate the release of the second part 30.

When the wire 25 is broken by means of a heating device, the wire 25 stops holding the jaws in the closed position and by the blades spontaneously deviate from the second part 30, driving with them the jaws 2 and 6. During the opening of the blades and jaws, the free portion of the length of each blade leaves the curved surface of the branches 14 and 16 on which they are plated. The blades can thus open spontaneously until reaching a rectilinear flat shape (180 ° opening) as shown in FIG. 2. Such an assembly device therefore makes it possible to release very quickly a plane in which the second piece and thus facilitate its release in a maximum of directions of space, avoiding any risk of interference between the first and the second part.

In the rest position, the blades 10, 12 extend one beside the other and parallel to each other in the same plane.

According to a first embodiment of an assembly device according to the invention shown in Figures 1 and 2, each blade 10 and 12 is fixed to the first part 45 by means of screws 47 and 46 respectively.

According to a second embodiment of an assembly device according to the invention shown in FIGS. 3 to 7, the assembly device further comprises a base 1 1 comprising a first branch 16 to which the first blade 10 is fixed, and a second branch 14 to which is fixed the second blade 12. Each leg 14, 16 has at least one means for fixing the base on the first part, for example holes 15, 17 through the branches 14, 16 in order to allow attachment to the first part with screws for example.

Each blade 10, 12 has a longitudinal direction corresponding to the largest dimension of each blade in the rest position. The first jaw 2 is fixed to a longitudinal end of the first blade 10. The second jaw 6 is attached to a longitudinal end of the second blade 12. The jaws can be fixed to the longitudinal ends of the blades by any suitable method of attachment such that by gluing. The longitudinal end of the first blade 10 which is fixed to said first piece through the first leg 16 of the base 1 1 is located on the opposite side to the longitudinal end of the first blade 10 to which is fixed the first jaw 2. In the same way, the longitudinal end of the second blade 12 which is fixed to said second piece through the second leg 14 of the base 1 1 is located on the opposite side to the longitudinal end of the second blade 12 to which is fixed the second jaw 6. Between each of its longitudinal ends, each blade has at least one free portion in flexion, that is to say a length of blade which is fixed neither on the base nor on the first part.

As can be seen in FIGS. 3 and 7, when the jaws are in the closed position, the free portions of the blades (which are therefore not bonded to the jaws 2, 6 nor to the base 1 1) are pressed onto a curved portion branches 14 and 16. This makes it possible to increase the stability of the assembly device and in particular its resistance to the various stresses likely to be experienced by the assembly device, the first part and the first part in the closed position (before release of the second piece) such as vibrations.

The base 1 1 has a parallelepiped-shaped top extended in the lower part (that is to say from the jaws when closed to the first part) by said branches 14 and 16. The branches 14 and 16 extend in two directions parallel to each other (like the blades) but in opposite directions.

When the wire 25 is broken by means of a heating device, the wire 25 stops holding the jaws in the closed position and by the blades spontaneously deviate from the second part 30, driving with them the jaws 2 and 6. During the opening of the blades and jaws, the free portion of the length of each blade leaves the curved surface of the branches 14 and 16 on which they are plated. The blades can thus open spontaneously until reaching a rectilinear flat shape (opening at 180 °) in the same manner as in FIG. 2. Such an assembly device therefore makes it possible to release very quickly a plane in which is located the second part and thus facilitate its release in a maximum of directions of space, avoiding any risk of interference between the first and the second part.

When the blades 10 and 12 are formed of electrically conductive metal material, it is possible to provide that the control causing the rupture of the fuse wire comprises the supply of electrical power via said blades 10, 12 for example by contacts established at the level of the connection of the blades 10, 12 to the first part. One of the blades 10 or 12 is then connected to the positive terminal (plus) of an electrical generator while the other blade is connected to the negative terminal (minus) of the electric generator. As shown in FIG. 3, the heating of a wire 55 adapted to attain a temperature above the melting temperature of the material forming the fusible wire 25 of polymeric material can be obtained by electrical connection at a bonding point 57 of the wire 55 heating on the jaw 6 wire on the one hand to an electrical conductor wire 56 connected to the blade 12, the heating wire 55 being on the other hand connected to the blade 10 at the point of contact 58. In this case the jaws 2 and 6 are formed of a non-electrically conductive material or, if formed of an electrically conductive material, an electrically insulating material (eg in the form of an adhesive coating or a thin film) to be disposed between the wires 55 and 56 and the jaws.

Another variant for electrically feeding the heating wire via said blades 10, 12 when they are made of electrically conductive material is to cut longitudinally one of the blades and to separate the two portions obtained by an insulating material, one portions of said blade being connected to the positive (plus) terminal of an electrical generator while the other portion of the blade is connected to the negative (minus) terminal of the electrical generator. If the jaws are also formed of an electrically conductive material, the jaw to which the two portions of the blade are attached may also be split into two portions electrically insulated from each other (by an insulating material or by a space left free between the two portions.

The device can be fixed to a first part by virtue of the branches 14 and 16 and possibly also with a support 40 shown in FIG. 12 making it possible to limit the opening and the angular displacement of the jaws 2, 6 in the open position by forming a frame presenting a rectangular opening on the edges of which the blades come into abutment after release of the assembly by breaking the wire 25. The support 40 may have a hole 43 to allow its attachment to the first piece with screws for example .

In a third embodiment of an assembly device according to the invention shown in FIGS. 8 and 9, the portion 60 of the second part cooperating with the jaws 2, 6 comprises a rod 62 having at its end a suitable plate 64 to be able to form a stop with the faces of jaws disposed on the side of the first piece 45, the rod being free in translation within said jaws 2, 6 in the closed position (Figure 8). When the device for holding the jaws in the closed position in the form of the wire 25 is broken by fusion, the jaws 2, 6 open spontaneously by elastic bending return action of the blades 10, 12 and release the portion 60 of the second piece and so the second piece (Figure 9).

In a fourth embodiment of an assembly device according to the invention shown in Figures 10 and 11, the portion 65 of the second part cooperating with the jaws 2, 6 comprises a plate 68 abutting against the upper faces of the jaws 2, 6, the plate 68 being connected to a compressed spring 67 (FIG. 10). When the device for holding the jaws in the closed position in the form of the wire 25 is broken by fusion, the jaws 2, 6 open spontaneously by the bending resilient return action of the blades 10, 12 and release the portion 65 of the second piece, thus allowing the relaxation of the spring 67 and the bringing together of the plate 68 of the surface of the first piece 45.

The invention can be the subject of many variants and applications other than those described above. In particular, it goes without saying that unless otherwise indicated the various structural and functional characteristics of each of the embodiments described above should not be considered as combined and / or closely and / or inextricably linked to each other, but to contrary as mere juxtapositions. In addition, the structural and / or functional characteristics of the various embodiments described above may be wholly or partly the subject of any different juxtaposition or any different combination. For example, it is possible to provide an assembly device comprising three or more blades and the same number of jaws by adapting the arrangement of the blades and the shape of the jaws so that they are adapted to be able to maintain said second part in closed position. Nothing also prevents to provide that only one of the two blades is resiliently biased in bending to an open position.

Claims

1 / - Device for assembling a first part (45) to a second part (30), said device comprising:

at least one first jaw (2) and at least one second jaw (6), said jaws being carried by the first piece, at least one of the two jaws being guided relative to the first piece, so that the Jaws can be placed:

in the closed position, in which the jaws (2, 6) cooperate with a portion of the second piece so as to prevent spacing, in at least one direction and in at least one direction, from said portion of the second piece relative to to the jaws,

o in the open position, in which the jaws allow a spacing of said portion of the second piece relative to said jaws,

- a holding device (25) of the jaws in the closed position, said holding device (25) being controlled release and adapted to be broken by fusion,

characterized in that it comprises a resilient return device of said jaws adapted to resiliently recall said jaws (2, 6) in the open position.

2 / - Device according to claim 1, characterized in that, in the closed position, said jaws cooperate with said portion of the second part so as to limit the relative displacements between said portion and said jaws (2, 6) in the direction of an increase in spacing at least in one direction between said first piece and said second piece (30).

3 / - Device according to one of claims 1 or 2, characterized in that said elastic return device comprises at least a first blade (10) and at least a second blade (12) bending resilient and attached to said first piece (45), the first jaw (2) being attached to said first blade (10) at at least one attachment point and the second jaw (6) being attached to said second blade (12) at at least one attachment point, each point of attachment of a jaw to a blade being spaced longitudinally along said blade (10, 12) relative to at least one attachment point of said blade to the first piece (45).

4 / - Device according to one of claims 1 to 3, characterized in that it comprises at least one heating device (50) adapted to be able to melt break said holding device (25).

5 / - Device according to one of claims 1 to 4, characterized in that, in the closed position, said second part (30) is rotatable relative to the jaws (2, 6).

6 / - Device according to claim 3 or one of claims 4 to 5 dependent on claim 3, characterized in that it comprises a base (1 1) carried by the first piece (45), said base (1 1 ) including:

a first limb (16) to which is fixed the first blade (10), said first limb having at least one curved portion, said first blade being adapted to be pressed against said curved portion of the first limb in the closed position and

- A second branch (14) to which is fixed the second blade (12), said second branch having at least one curved portion, said second blade being adapted to be pressed against said curved portion of the second branch in the closed position.

7 / - Device according to claim 3 or one of claims 4 to 6 dependent on claim 3, characterized in that, each blade having a longitudinal direction, the first jaw (2) is attached to a longitudinal end of the first blade (10) and the second jaw (6) is fixed at a longitudinal end of the second blade (12).

8 / - Device according to claim 7, characterized in that each blade (10, 12) is elastically deformable at least by bending about an axis orthogonal to said longitudinal direction of said blade.

9 / - Device according to one of claims 7 or 8, characterized in that, in the open position, the longitudinal direction of the first blade (10) is substantially parallel to the longitudinal direction of the second blade (12). 10 / - Device according to one of claims 7 to 9, characterized in that a longitudinal end of the first blade (10) is fixed to said first part, said longitudinal end being separate from the longitudinal end of the first blade (10) to which is fixed the first jaw (2) and in that a longitudinal end of the second blade (12) is fixed to said first piece, said longitudinal end being distinct from the longitudinal end of the second blade ( 12) to which the second jaw (6) is attached.

11 / - Device according to one of claims 1 to 10, characterized in that, in the closed position, said jaws form a receiving housing of said second part (30), said receiving housing having a conjugate form of the second part .

12 / - Device according to one of claims 1 to 11, characterized in that it comprises a base (11) carried by the first piece (45), said base (11) having at least one face, said contact face adapted to be in contact with said second part (30) in the closed position, said contact face being adapted to be able to act as a compression abutment in the direction of a bringing together of said portion of the second part (30) by compared to the first piece.