MOUNTING DEVICE FOR A CLOCK OR A PIECE OF JEWELRY

Description

Technical field of the invention

[0001] The present invention generally relates to a fastening device that can be integrated into a bracelet of a timepiece or jewelry piece. Such a fastening device can be used to attach two bracelet strands together, or to attach a bracelet or bracelet strand to a timepiece or jewelry piece. State of the art

[0002] Document FR2445120 is known in the prior art of bracelet attachment devices, which describes a removable system for a wristwatch having a sliding pusher acting on cams to pivot levers having several stable positions to adapt to different sizes of case or lug width of the wristwatch case. On the other hand, this system does not offer a solution for simply and quickly locking and unlocking the attachment device.

[0003] Also known from document CH712232 is a fastening device with a retractable pin system, provided with automatic unlocking when the system is inserted into the lugs of the case of a wristwatch. However, this system also does not provide a solution for simply and quickly locking and unlocking the fastening device. Finally, document IT201900007536A1 discloses a clasp for jewelry, in particular for bracelets, earrings and necklaces with the characteristics of the preamble of claim 1. Statement of the invention

[0004] An aim of the present invention is to address the drawbacks of the prior art mentioned above and in particular, first of all, to propose a fastening device which allows a user to lock and unlock it quickly, ergonomically and simply.

[0005] For this purpose, the invention relates to a device for attaching a bracelet strand to a hooking interface formed, for example, by a bar of a watch case or a terminal element of another bracelet strand, comprising: a receiving part intended to receive the hooking interface, a locking part, movable between: a locking position, in which the locking part and the receiving part are locked on the hooking interface, an opening position, in which the locking part and the receiving part are free to be moved away from the hooking interface, a control device with at least one translationally movable actuating button, arranged to allow a user to move the locking part at least from the locking position to the opening position, characterized: in that the locking part is rotatable with reference to the receiving part, and in that the attachment device comprises a return mechanism providing engagement between the actuating button and the locking part during movement of the locking part from the locking position to the opening position and arranged to transform the translational movement of the actuating button into rotational movement of the locking part.

[0006] According to the above implementation, the attachment device comprises a receiving part with a movable locking part, which makes it possible to lock or unlock the attachment device on the attachment interface. In addition, the control device with a pusher is simple to use and the return mechanism makes it possible to provide a direction of movement of the pusher in a direction transverse to the bracelet, with the rotation of the locking part around an axis also transverse to the bracelet: the control movement is simple to carry out, for example by pinching the pusher and bracelet attachment device between thumb and index finger.

[0007] According to one embodiment, the attachment device comprises a locking member capable of being in a first state in which it is arranged to hold the locking part in the open position. In particular, the locking member is movable so as to be able to be in the first state and lock the locking part in the open position.

[0008] According to one embodiment, the fastening device comprises a control part for automatically triggering the movement of the locking member and consequently the movement of the locking part into the locking position. In other words, a control part is provided for triggering, preferably automatically, a movement, which is advantageously automatic, of the locking part from the opening position to the locking position.

[0009] According to one embodiment, the locking member and the control part come from a single piece. In other words, the locking member and the control part are a single piece or monobloc. In particular, the control part can be a particular portion of the locking member, such as an end, a tab, an index which can interact with another part (such as for example the attachment interface, or a trigger button of the attachment device) to move or set in motion the locking member and release it from the locking part.

[0010] According to one embodiment, the locking member is capable of being in a second state in which it is arranged to be released from the locking part by the hooking interface. In particular, the locking member is movable between a locking position (the first state) and a release position (the second state) to unlock or leave the locking part free. Preferably, it is the hooking interface which moves the locking member from the locking position (the first state) to the release position (the second state).

[0011] According to one embodiment, the locking member is a ratchet device.

[0012] According to one embodiment, the locking member forms a ratchet mounted to rotate around a locking axis, with: a first end arranged to engage with the locking part in the open position, a second end arranged to contact the hooking interface during assembly of the attachment device with the hooking interface (i.e. during the docking movement of the attachment device on the hooking interface, the latter can contact and push the second end), and cause rotation of the pawl around the locking axis to disengage the pawl from the locking part.

[0013] According to one embodiment, the locking member can alternatively be a slider arranged in a slide.

[0014] According to one embodiment, the attachment device comprises a locking member spring exerting a torque on the pawl tending to maintain it in one of said first and second states, preferably in said first state. In other words, preferably, the natural position or equilibrium position or stable position of the locking member is the locking position (the first state).

[0015] According to one embodiment, the attachment device comprises a control member spring exerting a torque on the locking part tending to maintain it in the locking position or the open position, preferably in the locking position. In other words, preferably, the natural or balanced or stable position of the locking part is the locking position, which guarantees natural maintenance of the locking of the attachment device on the attachment interface.

[0016] According to one embodiment, the attachment device comprises a first actuating button and a second actuating button, the actuation of the first actuating button allowing automatic movement of the locking part into the locking position, the actuation of the second actuating button allowing automatic movement of the locking part into the opening position.

[0017] According to one embodiment, the attachment device comprises a reference part, and the receiving part and the locking part are movable relative to the reference part, their movement being symmetrical or asymmetrical. According to this embodiment, the receiving part and the locking part are both movable. Synchronous, out-of-phase, symmetrical or asymmetrical movements can be envisaged. It can be envisaged that the blocking member in the first state (or even the locking part in the open position) maintains the receiving part in an open position or in a position of disengagement from the attachment interface.

[0018] According to one embodiment, the actuating button is movable in rotation with reference to the receiving part.

[0019] According to one embodiment, the actuating button is movable in translation with reference to the receiving part.

[0020] According to one embodiment, the locking part is movable in translation with reference to the receiving part.

[0021] According to one embodiment, the locking part is movable in rotation with reference to the receiving part.

[0022] According to one embodiment, the receiving part is movable in translation with reference to a reference part.

[0023] According to one embodiment, the receiving part is movable in rotation with reference to a reference part.

[0024] In other words, one aspect of the disclosure may relate to a device for attaching a bracelet strand to a hooking interface formed, for example, by a bar of a watch case or a terminal element of another bracelet strand, comprising: a receiving part intended to receive the hooking interface, a locking part, movable in translation with reference to the receiving part and between: a locking position, in which the locking part and the receiving part are locked on the hooking interface, an opening position, in which the locking part and the receiving part are free to be moved away from the hooking interface, a control device with at least one translationally movable actuating button, arranged to allow a user to move the locking part at least from the locking position to the opening position, characterized: and in that the attachment device comprises a return mechanism arranged to transmit the translational movement of the actuating button to the translational movement of the locking part or to transform the translational movement of the actuating button into a separate and / or reduced and / or amplified translational movement of the locking part, for example.

[0025] According to one embodiment, the axis of rotation of the locking part is parallel to the translation direction of the actuating button.

[0026] According to one embodiment, in any plane comprising the axis of rotation of the locking part, a projection of the translation direction of the actuating button forms a straight line which has an angle of less than 80° and preferably less than 60° with the axis of rotation of the locking part. According to this implementation, the axis of rotation of the locking part is not parallel to the direction of translation of the actuating button. In space, the axis of rotation of the locking part and the direction of translation of the actuating button are distinct.However, to provide a compact and ergonomic device, in any plane containing the rotation axis of the locking part, a projection of the translation direction of the actuating button is a straight line which has an angle of less than 80° and preferably less than 60° or even less than 30° with the rotation axis of the locking part (to verify this condition, it is sufficient to take a plane containing the rotation axis of the locking part, to rotate it around the rotation axis of the locking part by angle increment, to make a projection of the translation direction of the actuating button, to verify whether the angle between these two straight lines satisfies the angle condition, and to start again after another incremental rotation).In other words, the axis of rotation of the locking part and the direction of translation of the actuating button are arranged "at an angle" in space relative to each other or on two so-called "left" straight lines (non-parallel and having no point of intersection). In particular, the axis of rotation of the locking part and the direction of translation of the actuating button are each substantially, or almost oriented in a transverse direction of the bracelet or bar forming the attachment interface.

[0027] According to one embodiment, the axis of rotation of the locking part and the direction of translation of the actuating button are each contained in two separate parallel planes, and the projection of the direction of translation of the actuating button in the plane containing the axis of rotation of the locking part is a straight line which has an angle of less than 80° and preferably less than 60° or even less than 30° with the axis of rotation of the locking part.

[0028] According to one embodiment, the receiving part and the locking part form the jaws of a mouth, preferably of an animal mouth, more preferably of a feline mouth.

[0029] According to one embodiment, the ratchet forms a tongue arranged between the receiving part and the locking part.

[0030] According to one embodiment, the return mechanism comprises: at least one cam track arranged on one of the actuating button or the locking part, at least one follower index arranged on the other of the actuating button or the locking part, and engaged with the cam track to transform a movement of the actuating button into a movement of the locking part.

[0031] According to one embodiment, at least one of the cam track and / or the follower index comprises a stop portion arranged to make the return mechanism irreversible when the locking part is in the locking position and subjected to an opening force.

[0032] According to one embodiment, the stop portion is formed by a flat included in a stop plane oriented at 90° to a force transmitted by the locking part and applied to one of the cam track and the follower index by the other of the cam track and the follower index.

[0033] According to one embodiment, the stop portion is formed by a flat included in a stop plane oriented at 90° to a plane normal to the axis of rotation of the locking part.

[0034] According to one embodiment, the cam track and the follower index each comprise a stop portion, the stop portions being arranged opposite one another to make the return mechanism irreversible when the locking part is in the locking position.

[0035] The return mechanism is provided to provide engagement or connection between the actuating button and the locking part during movement of the locking part from the locking position to the open position, and preferably, the return mechanism is provided to provide constant engagement or connection between the actuating button and the locking part during movement of the locking part from the locking position to the open position and / or from the open position to the locking position. According to this implementation, the movement of the locking part from the locking position to the open position is controlled or controlled or caused by the movement of the actuating button, and preferably throughout the movement of the locking part from the locking position to the open position and / or from the open position to the locking position.In other words, the two parts are linked together during their respective movements by the return mechanism. It can be noted that the return mechanism is intended to transform a first movement (of translation) into a second movement (of rotation or translation), and does not simply form a release mechanism intended to release a movement of the locking part (of rotation or translation) following a movement of the actuating button (of translation).

[0036] According to one embodiment, the return mechanism is provided to provide a connection that blocks five degrees of freedom between the actuating button and the locking part, and preferably throughout the movement of the locking part from the locking position to the open position and / or from the open position to the locking position. For example, a helical connection may be provided between the two parts. Consequently, the movement of one of the actuating button and the locking part in its respective direction of movement causes the movement of the other of the actuating button and the locking part in its respective direction of movement, and preferably throughout and / or at any time of the respective movements.

[0037] According to one embodiment, the return mechanism is provided to provide a kinematic connection for transmitting the movement of the actuating button to the movement of the locking part. When transmitting the movement of the actuating button to the locking part, the movement is transformed, because the actuating button and the locking part have different movements or in different directions.

[0038] According to one embodiment, the attachment device comprises guide means arranged to guide the attachment interface in the receiving part and / or in the locking part during assembly of the attachment device with the attachment interface.

[0039] According to one embodiment, the attachment device comprises stop means arranged to limit at least one movement of the attachment interface in the attachment device, once the receiving part is locked onto the attachment interface by the locking part. It is possible to envisage blocking a movement of the attachment interface in the attachment device in one or more directions.

[0040] According to one embodiment, the attachment interface comprises a protruding portion, in which: the guide means comprise a slot arranged to guide the projecting portion, the guide means comprise at least one face arranged to come into abutment with the projecting portion.

[0041] A second aspect of the invention relates to a piece of jewelry or timepiece, comprising at least one attachment device according to the first aspect.

[0042] According to one embodiment, the piece of jewelry or timepiece comprises: two strands of bracelet to be fastened together to attach the piece of jewelry or timepiece around a user's limb, wherein a first bracelet strand comprises the attachment interface, and wherein a second bracelet strand comprises the attachment device according to the first aspect, so as to form a clasp of the bracelet.

[0043] According to one embodiment, the piece of jewelry or timepiece comprises: a main body, such as a chassis or a watch case, with two attachment interfaces, a strap, two attachment devices according to the first aspect, each connecting the strap to one of the attachment interfaces of the main body.

[0044] According to one embodiment, the piece of jewelry or timepiece comprises: a main body, such as a chassis or a watch case, with two attachment interfaces, a single bracelet strand, one end of which is secured to the main body, a fastening device according to the first aspect, connecting the bracelet strand to the attachment interface of the main body. Description of figures

[0045] Other characteristics and advantages of the present invention will appear more clearly on reading the following detailed description of an embodiment of the invention given by way of non-limiting example and illustrated by the appended drawings, in which: [ Fig. 1 ] represents a perspective view of a fastening device in a locked state on a fastening interface; [ Fig. 2 ] represents the attachment device of the figure 1 without the hook interface; [ Fig. 3 ] represents the attachment device of the figure 1 in an unlocked state and released from the hook interface; [ Fig. 4 ] represents a partial perspective and bottom view of the attachment device of the figure 3 to show at least partially a control device of the attachment device; [ Fig. 5 ] represents a partial perspective and rear view of the attachment device of the figure 3 to show at least partially the control device of the attachment device; [ Fig. 6 ] represents another partial perspective and rear view of the attachment device of the figure 3 to show at least partially a return mechanism of the attachment device; [ Fig. 7 ] represents a partial side view of the attachment device of the figure 3 ; [ Fig. 8 ] represents a partial perspective and top view of the attachment device of the figure 3 to show at least partially a locking member of the attachment device. Fig. 9 ] represents the partial view of the figure 6 with the attachment device in the locked state on the attachment interface; [ Fig. 10 ] represents the partial view of the figure 7 with the attachment device in the locked state on the attachment interface; [ Fig. 11 ] represents a partial perspective and top view of the attachment device of the figure 1 to show the hook interface; . Fig. 12 ] represents two alternatives in top view as to the orientation of the control device organs. Detailed description of embodiment(s)

[0046] There figure 1 represents a perspective view of a fastening device locked onto a fastening interface 100, formed in this example by a cylindrical bar. The figure 2 represents the attachment device of the figure 1 without the attachment interface 100, to show that the attachment device comprises in particular a receiving part 10 which forms the upper part of the attachment device, and a locking part 20 which forms a lower part of the attachment device.

[0047] A pusher 31 is also visible at the rear of the fastening device, and is part of a control device for controlling the locking part 20, as will be explained below at figures 4 à 6 . As represented figures 4 And 5 , two pushers 31 are provided on each side of the attachment device in this embodiment. However, only one pusher 31 can be provided.

[0048] In this example, the attachment device has the general shape of a feline head, and the receiving part 10 forms, with the locking part 20, a jaw which can receive the attachment interface 100, but other embodiments can be provided, both for the receiving part 10 and the locking part 20 and for the attachment interface 100.

[0049] There figure 3 represents the attachment device in an unlocked state and released from the attachment interface 100. For this purpose, the locking part 20 has been pivoted downwards during an actuation of the pusher 31 (the latter is in fact in a depressed position figure 3 ), so that the receiving part 10 and the locking part 20 can be released from the hooking interface 100.

[0050] In other words, the locking part 20 is movable between: a locking position (shown figures 1 et 2 ), in which the locking part 20 and the receiving part 10 are locked on the hooking interface 100, an open position (shown figure 3 in particular), in which the locking part 20 and the receiving part 10 are free to be moved away from the attachment interface 100.

[0051] A blocking member 40 is also visible figure 3 , located between the receiving part 10 and the locking part 20. The function of the blocking member 40 is to hold the locking part 20 in the open position ( figure 3 ), and to release the pivoting of the locking part 20 from the open position to the locking position ( figures 1 et 2 ) when the hooking interface is positioned between the receiving part 10 and the locking part 20. This will be explained in detail in figures 7 et 8 .

[0052] THE figure 4 And 5represent partial perspective views of the attachment device of the figure 1 to partially show the control device of the attachment device.

[0053] Reception room 10 is shown figure 4 with the covering having the shape of a panther's head, and figure 5 without the cladding to show a base part 11 which acts as a frame to support the cladding of the figure 4 , but also the organs of the attachment device.

[0054] As regards the control device, this comprises the two pushers 31, formed by control buttons mounted on supports 53 which themselves slide on a pusher shaft 54 ​​so as to be able to be actuated by a pinch of the user. The receiving part 10 and in particular the base part 11 comprises first bearings 111 in which the pusher shaft 54 ​​is assembled (with or without play). In this example, each pusher 31 comprises a control button attached and fixed on a support 53, but one-piece parts can be envisaged.

[0055] As also shown by the figures 4 And 5, the locking part 20 is pivotally mounted around a locking shaft 21 assembled (with or without play) in second bearings 112 secured to the base part 11. Thus, the base part 11 (forming the frame of the receiving part 10) supports the locking shaft 21 and the pusher shaft 54 ​​which are parallel. According to one embodiment, the axis of rotation of the locking part 20 may be parallel to the sliding direction of the pushers 31.

[0056] There figure 6 represents another partial perspective and rear view of the attachment device of the figure 1 to show the control device and a return mechanism of the attachment device.

[0057] On the right side of the figure 6 , we can see a pusher 31 with a support 53 sliding on the pusher shaft 54, as explained above. Each support 53 has an upper flat face opposite a sliding plane 113 of the base part 11, which guarantees a translational movement of each pusher assembly 31, and an absence of rotation of these parts around the pusher shaft 54.

[0058] On the left side of the figure 6 , the pusher 31 with its support 53 normally present have been masked. We can first note the presence of a control member spring 55 mounted on the pusher shaft 54, between the two supports 53 (of which the left one is masked). The control member spring 55 is arranged to push the pushers 31 outwards.

[0059] It is also possible to note the presence of a follower index 51 engaged in a cam track 52 formed in the locking part 20. The follower index 51 is driven into the masked left support 53, and a second follower index is driven into the right support 53 which masks it, as well as a second cam track formed in the locking part 20. The follower indexes 51 and the cam tracks 52 therefore form a return mechanism. Indeed, a sliding movement of the pushers 31 imposes a rotational movement of the locking part 20 and vice versa. The movement of the locking part 20 is synchronous, that is to say simultaneous and dependent on the movement of the pushers 31.

[0060] In figure 6 , the locking part 20 is in the open position, and the visible follower index 51 is located in the right-hand end portion of the corresponding cam track 52. The cam track 52 comprises another end with a stop portion 521 which is a flat. In particular, the flat forming the stop portion 521 is contained in a plane parallel to a plane containing the axis of rotation of the locking part 20 (the flat is normal to a plane perpendicular to the axis of rotation materialized by the locking shaft 21).

[0061] When the locking part 20 is in the locking position, as shown in figure 9 , then the follower index 51 is opposite and in contact with the stop portion 521. Any opening force applied to the locking part 20 amounts to exerting a force normal to the flat of the stop portion 521 on the follower index 51, which does not cause any tangential force (oriented according to the sliding direction of the pushers 31 and supports 53) and therefore an irreversibility of the control device. It is possible to optionally provide another flat on the follower index 51 arranged to be opposite the stop portion 521 when the locking part 20 is in the locking position, which further improves the irreversibility with two opposite flat faces and a force normal to these flat faces. This arrangement with one or more flats secures the locking position. In addition, having flat faces on each pusher requires pressing both pushers simultaneously to unlock the part.Indeed, if we only apply force to one of the pushers, the other remaining opposite a flat face will block the rotation of the part and therefore the translation of the first pusher. This makes it possible to further secure the opening by preventing it from opening if pressure is applied to a single pusher in an untimely manner (pressing the watch against a table for example).

[0062] Furthermore, it may be noted that the control member spring 55 is arranged to push the pushers 31 outwards, i.e. with the locking part 20 in the locking position, which further improves the securing of the locking position. However, it will be remembered that the primary function of the control member spring is to ensure rotation in the locking position, and that of the flats is to secure this locking position.

[0063] In the example given, the cam tracks 52 are provided in the locking part 20 and the follower indexes 51 are mounted in a recessed connection in the supports 53, but the reverse can be provided.

[0064] There figure 7 represents a partial side view of the attachment device of the figure 1 , to clearly explain the operation of the locking member 40. A locking shaft 41 is assembled (with or without play) on the receiving part 10 and the locking member 40 is pivotally mounted on this locking shaft 41. A locking member spring 42 is arranged to impose on the locking member 40 the locking position shown figure 7 .

[0065] There figure 8 shows in detail the assembly of the locking member 40. The base part 11 comprises a fork which receives the locking shaft 41. Furthermore, the locking member spring 42 bears on the base part 11 to exert a return force on the locking member 40. It is possible to note the presence of a groove 201 in the locking part 20, arranged opposite the locking member 40.

[0066] Back to the figure 7 , it can be noted that the locking member 40 has a first end, called the locking end 411, engaged with the locking part 20, like a ratchet. The locking part 20 cannot go into the locking position. On the other hand, the locking member has a tab with a second end 412, located between the receiving part 10 and the locking part 20. This second end 412 forms a control part as explained below.

[0067] To release the locking part 20, it is sufficient to bring the hooking interface 100 close to the second end 412 of the locking member 40 and to exert a slight introduction force against the return force of the locking member spring 42. During such a docking movement of the hooking interface 100 on the second end 412 of the locking member 40, the latter tilts in an anticlockwise direction relative to the figure 7 and the locking end 411 disengages from the locking part 20, which is then free to move towards the locking position under the action of the locking member spring 42. Naturally the locking member could be separate from the control part, the control part then cooperating with the locking member 40 so that the locking end 411 disengages from the locking part 20, which is then free to move towards the locking position under the action of the locking member spring 42.

[0068] There figure 10 represents the attachment device of the figure 7 in the locked state. The locking part 20 is in the locking position, so that the receiving part 10 and the locking part 20 cannot be released from the hooking interface 100. It can be noted that the tongue and the second end 412 of the locking member 40 are partially housed in the groove 201 of the locking part, and that the locking end 411 is simply resting on one face of the locking part 20. The locking member spring 42 continues to exert a force on the locking member in the clockwise direction.

[0069] There figure 11 represents a partial view of the attachment device, with the receiving part 10 masked to clearly show the attachment interface 100, which comprises a projection 110 which forms part of the guide means. Indeed, a longitudinal slot can be provided in the receiving part 10 which receives the projection 110, so that the user, by engaging the attachment interface 100 in the attachment device, will find a guide aid to correctly position the parts together.

[0070] Finally, it can be provided that the projection 110 comes into abutment with the receiving part 10 or with another part of the attachment device to provide a well-defined final assembly position.

[0071] We can also note figure 11 that the attachment interface 100 is connected to a connecting member 120 which may be part of a watch case, or a piece of jewelry to be worn. In this case, a fastening device at each end of a bracelet may allow the bracelet attached to the watch case, or to the jewelry, to be exchanged for another bracelet. The connecting member 120 may just as well be an end link of a bracelet strand, in which case, the fastening device may be used to open or close a bracelet.

[0072] An alternative to the previously described embodiment is to provide the attachment device with an inverted construction, for example with reference to a carrier's arm. In other words, the locking part can be provided as "fixed" or acting as a chassis or base structure, and the receiving part as movable.

[0073] A second alternative is to provide a movable receiving part, such as the locking part, their respective movement being able to be symmetrical, asymmetrical, synchronous or out of phase in time. In one case the control device can move the locking part independently of the receiving part, the control device then preferably comprises two grippers, or the control device can move both together in a coordinated manner.

[0074] A third alternative to the figures 1 à 11 is to have a displacement of the control device at an angle, that is to say that an angle can be provided between the translation axis of the grippers and the rotation axis of the locking part, or between the translation axis of the grippers and the axis perpendicular to the longitudinal axis of the bracelet, or a combination of the two, each angle being less than 80°, preferably less than 60°.

[0075] Indeed, as shown figure 12 in a partial top view, we can see on the left side of this figure the assembly of the control device with a translation direction Tp of the pushers 31 parallel to the axis of rotation Rv of the locking part 20 mounted on the base part 11, which corresponds to the configuration of the figures 1 à 11 . However, on the right side of this figure 12 , it can be noted that we have the translation direction Tp of the pushers 31 which is not parallel to the axis of rotation Rv of the locking part 20 mounted on the base part 11. In other words, the translation direction Tp of the pushers 31 is at an angle or of a particular orientation relative to the axis of rotation Rv of the locking part 20, to provide particular ergonomics or a compact model. The return mechanism and the locking remain similar to what is described above.

[0076] Regarding the use of the attachment device, the following operation can be noted.

[0077] Starting from the locked state of the figures 1, 2 , 9,10 Or 11 , the locking part 20 is in the locking position so that the hooking interface 100 cannot be released from the receiving part 10 and the locking part 20.

[0078] To detach the hooking interface 100 from the receiving part 10 and the locking part 20, the user must press the pushers 31 to slide them in the sliding direction defined by the pusher shaft 54. During this movement, the return mechanism causes, by means of the follower indexes 51 and the cam tracks 52, an automatic rotational movement of the locking part 20. The latter pivots from the locking position to the opening position of the figures 3, 4 Or 7, in which the hooking interface 100 is released from the receiving part 10 and the locking part 20.

[0079] During the movement of the locking part 20 towards the open position, the locking end 411 of the locking member 40 maintains contact with the locking part 20 due to the constant force of the locking member spring 42. The locking end 411 eventually snaps into place with the locking part 20 which arrives in the open position, and locks it in this position. The open position is then stable and maintained and the hooking interface can be released.

[0080] From this open position, the user then simply needs to approach the hooking interface 100 between the receiving part 10 and the locking part 20 during a docking movement, to exert a slight force on the second end 412 and actuate the blocking member 40 via its second end 412, which has the effect of unlocking the locking part 20. The latter can then automatically return to the locking position, under the effect of the control member spring 55 which constantly pushes the pushers 31 outwards and the locking part 20 into the locking position via the follower indexes 51 and the cam tracks 52.

[0081] Back in the locking position, the follower indexes 51 are opposite the stop portion 521, which makes the mechanism irreversible (a force applied to the locking part 20 in the locking position cannot cause it to move towards the open position). To unlock the fastening device, the pushers 31 must be actuated. Industrial application

[0082] A fastening device according to the present invention, and its manufacture, are capable of industrial application.

[0083] It will be understood that various modifications and / or improvements obvious to those skilled in the art may be made to the various embodiments of the invention described in the present description without departing from the scope of the invention.

[0084] In particular, a different return mechanism can be provided with gears, levers or connecting rods instead of the cams described. Actuation buttons in the form of rockers, drawers, or rotating crowns can also be considered for the control device. The bracelet can be an articulated bracelet, a flexible bracelet (fabric, leather, polymer, etc.). The materials for manufacturing the attachment device can be metallic (precious metals, coated steels, stainless steels, sintered parts, etc.) or non-metallic (engineering plastics, resins, composite materials, etc.).

[0085] In general, it can be noted that the return mechanism is independent of the locking function of the locking part in the locking position and of its automatic movement from the open position to the locking position. In particular, the kinematics of the actuating buttons and / or the locking part is independent of the locking / unlocking functions of the locking part. It is possible to have a locking part and / or the actuating button movable in translation or in rotation, the locking / unlocking function of the locking part may or may not be provided in the attachment device.

Claims

1. A device for attaching a bracelet strand on a hooking interface (100) formed for example by a bar of a watch case or of a terminal element of another bracelet strand, comprising: - a receiving piece (10) intended to receive the hooking interface (100), - a locking piece (20), movable between: • a locking position, in which the locking piece (20) and the receiving piece (10) are locked on the hooking interface (100), • an opening position, in which the locking piece (20) and the receiving piece (10) are free to be moved away from the hooking interface (100), - a control device with at least one actuating button movable in translation, arranged to allow a user to move the locking piece (20) at least from the locking position to the opening position, the locking piece (20) being movable in rotation with reference to the receiving piece (10), characterized in that the attachment device comprises a return mechanism providing an engagement between the actuating button and the locking piece during the movement of the locking piece from the locking position to the opening position and arranged to transform the translational movement of the actuating button into a rotational movement of the locking piece (20).

2. The attachment device according to claim 1, comprising a blocking member (40) capable of being in a first state in which it is arranged to hold the locking piece (20) in the opening position.

3. The attachment device according to claim 2, comprising a control part to automatically trigger the displacement of the blocking member (40) and consequently the displacement of the locking piece (20) in the locking position.

4. The attachment device according to any of claims 2 to 3, wherein the blocking member (40) and the control part are made in one piece.

5. The attachment device according to any of claims 2 to 4, wherein the blocking member (40) is capable of being in a second state in which it is arranged to be released from the locking piece (20) by the hooking interface (100).

6. The attachment device according to any of claims 2 to 5, wherein the blocking member (40) is a pawl device.

7. The attachment device according to claim 6, in its dependency on claim 5, wherein the blocking member (40) forms a pawl rotatably mounted about a blocking axis (41), with: - a first end arranged to engage with the locking piece (20) in the opening position, - a second end arranged to contact the hooking interface (100) during the assembly of the attachment device with the hooking interface (100), and cause a rotation of the pawl about the blocking axis (41) to release the pawl from the locking piece (20).

8. The attachment device according to the preceding claim, comprising a blocking member spring (55) exerting a force on the pawl tending to maintain it in one of said first and second states, preferably in said first state.

9. The attachment device according to any of claims 1 to 8, comprising a control member spring (55) exerting a force on the locking piece (20) tending to hold it in the locking position or the opening position, preferably in the locking position.

10. The attachment device according to any of the preceding claims, comprising a first actuating button and a second actuating button, the actuation of the first actuating button allowing an automatic displacement of the locking piece (20) in the locking position, the actuation of the second actuating button allowing an automatic displacement of the locking piece (20) in the opening position.

11. The attachment device according to any of claims 1 to 10, comprising a reference piece, wherein the receiving piece and the locking piece are movable relative to the reference piece, their movement being symmetrical or asymmetrical.

12. The attachment device according to any of claims 1 to 11 wherein the axis of rotation of the locking piece is parallel to the direction of translation of the actuation button.

13. The attachment device according to any of claims 1 to 12, wherein the receiving piece (10) and the locking piece (20) form jaws of a mouth, preferably of an animal mouth, more preferably of a feline mouth.

14. The attachment device according to claim 13, in its dependency on claim 6 or 7, wherein the pawl forms a tab arranged between the receiving piece (10) and the locking piece (20).

15. The attachment device according to any of claims 1 to 14, wherein the return mechanism comprises: - at least one cam track (52) arranged on one of the actuating button or of the locking piece (20), - at least one follower index (51) arranged on the other of the actuating button or of the locking piece (20), and engaged with the cam track (52) to transform a movement of the actuating button into a movement of the locking piece (20).

16. The attachment device according to claim 15, wherein at least one of the cam track (52) and / or of the follower index (51) comprises a stop portion (521) arranged to make the return mechanism irreversible when the locking piece (20) is in the locking position and subjected to an opening force.

17. The attachment device according to any of claims 15 to 16, wherein the cam track (52) and the follower index (51) each comprise a stop portion (521), the stop portions being arranged facing each other to make the return mechanism irreversible when the locking piece (20) is in the locking position.

18. The attachment device according to any of claims 1 to 17, comprising guide means arranged to guide the hooking interface (100) in the receiving piece (10) and / or in the locking piece (20) during the assembly of the attachment device with the hooking interface (100).

19. The attachment device according to any of claims 1 to 18, comprising abutment means arranged to limit at least one movement of the hooking interface (100) in the attachment device, once the receiving piece (10) is locked on the hooking interface (100) by the locking piece (20).

20. The attachment device according to claim 19, in its dependency on claim 18, the hooking interface (100) comprising a protruding portion, wherein: - the guide means comprise a slot arranged to guide the protruding portion, - the guide means comprise at least one face arranged to come into abutment with the protruding portion.

21. A piece of jewelry or timepiece, comprising at least one attachment device according to any of claims 1 to 20.

22. The piece of jewelry or timepiece according to claim 21, comprising: - two bracelet strands to be attached together in order to attach the piece of jewelry or timepiece around a limb of a user, wherein a first bracelet strand comprises the hooking interface (100), and wherein a second bracelet strand comprises the attachment device according to any of claims 1 to 20, so as to form a clasp of the bracelet.

23. The piece of jewelry or timepiece according to claim 21, comprising: - a main body, such as a chassis or a watch case, with two hooking interfaces, - a bracelet, - two attachment devices according to any of claims 1 to 20, each connecting the bracelet to one of the hooking interfaces of the main body.

24. The piece of jewelry or timepiece according to claim 21, comprising: - a main body, such as a chassis or a watch case, with two hooking interfaces, - a single bracelet strand, one end of which is secured to the main body, - an attachment device according to any of claims 1 to 20, connecting the bracelet strand to the hooking interface of the main body.