The present invention relates to a setting device to be inserted in its length between two free ends of a bracelet to adjust the length. This device has a predefined width and an adjustable length defining a general plane, first and second attachment means respectively to the first and second free ends of the bracelet being provided. More specifically, the first and second attachment means have a relative distance that can be modified to adjust the length of the device.
State of the art
 Adjustable length devices of this type are known from the state of the art.
Patent CH 653 226 discloses a wristwatch for timepieces of the type with folding blades. Each of the two blades of the clasp has a first end, free, intended to be connected to a free end of a bracelet and a second end to be connected to the second end of the other blade. The second end of a first blade carries two lateral pivots provided to cooperate with one or the other of several recesses formed, in the longitudinal direction of the clasp, on the second end of the other blade to allow adjustment of the length of the clasp.
A major disadvantage of this clasp is that it requires removing the corresponding timepiece wrist carrier to achieve the adjustment of its length. Thus, it may be necessary to do it several times before getting the right setting. In addition, the manipulations to be made to move from one position to another are not easy.
Disclosure of the invention
The present invention is intended to overcome the disadvantage of the aforementioned prior art by providing a device for adjusting the length, in particular of a watch strap, having means for allowing this adjustment to be made. very simple way, from one position to another, while ensuring good stability of the device in each of these positions.
Another object of the device according to the present invention is to provide a compact structure, adapted to be associated with a conventional type of clasp bracelet without increasing the size considerably.
For this purpose, the invention relates to a control device of the type mentioned above, characterized in that it comprises an elongate frame carrying, on a first side, the first attachment means, and, d a second side opposite to the first side in the longitudinal direction of the device, a support element of the second movable attachment means with reference to the frame, the support element being connected to the frame so as to allow its translation substantially in the direction longitudinal device to take one or the other of a plurality of stable positions.
The device is also characterized in that the frame carries locking means intended to ensure the stabilization of the support element in each of the stable positions, and in that the frame carries a movable control member in a transverse direction. in the general plane of the device and arranged to act on the locking means, when actuated, and allow a displacement of the support member.
With these special features, the adjustment device according to the present invention allows easy adjustment of the length of a bracelet in which it is integrated. In addition, the stability of the different positions associated with different lengths is reliably ensured.
Preferably, the locking means comprise at least one toothing extending substantially in the longitudinal direction of the device and a claw arranged to cooperate with the toothing, to lock the position of the support member with reference to the frame.
The control member and the claw can be pivotally mounted on the frame, being arranged on either side of the support member. The latter comprises an opening, in this case, to allow the transmission of pressure exerted on the control member to the claw and unlock the support member to allow movement.
In a preferred embodiment, the adjustment device according to the present invention can be integrated in a folding clasp type folding blades, the latter being housed under a cover or cover in a folded configuration. This cover then advantageously fulfills the function of frame for the adjustment device.
In general, the adjustment device may have a small thickness for its integration in such a clasp without increasing the thickness excessively.
Brief description of the drawings
Other features and advantages of the present invention will appear more clearly on reading the detailed description of the present invention which follows, with reference to the accompanying drawings given by way of non-limiting examples and in which:
 - FIG. 1 is a perspective view of a clasp of the folding leaf type incorporating a device for adjusting the length of the bracelet in which the clasp is intended to be inserted, according to a preferred embodiment of the invention;
 - FIG. 2 is an exploded view of the clasp of FIG. 1 showing the components of the device according to this preferred embodiment of the present invention.
Mode (s) of realization of the invention
FIG. 1 is a perspective view of a clasp 1 of the folding leaf type, apparently conventional, intended to be connected to two free ends of a bracelet (not shown) to ensure closure. The clasp is shown in its closed or folded configuration.
It comprises a lid or cover 2 in which are accommodated folding blades (more clearly visible in Figure 2) in this closed configuration of the clasp. The cover 2 comprises an elongated and slightly curved upper face 3 defining a general plane of the clasp and delimited by two lateral faces 4. Each of these lateral faces 4 has a control button 5 to release the clasp mechanism and to pass the clasp. from its closed configuration to an open configuration in a manner similar to what is known in the state of the art.
The clasp 1 shown, by way of nonlimiting illustration, is intended to be adapted to a metal bracelet and comprises first means of attachment to the bracelet, in the form of a first leg 6 disposed on a first side of the cover. The first tab 6 has a through hole 7 for receiving a bracelet attachment rod (not shown) housed in a suitable hole of the corresponding free end of the bracelet.
The clasp 1 comprises second means of attachment to the bracelet, in the form of a second and a third lugs 8 and 9 arranged opposite one another on the opposite side to the first side, in the longitudinal direction of the clasp. The tabs 8, 9 have through holes 10 aligned with each other and intended to receive a bracelet attachment rod (not shown) housed in a suitable hole of the corresponding free end of the bracelet.
FIG. 2 shows an exploded perspective view of the clasp 1 to better expose the structure and operation of an adjusting device according to a preferred embodiment of the present invention.
The folding blade mechanism is of known type and will be described quickly to the extent that it does not constitute the heart of the invention. It comprises a double blade formed of two identical elements, elongated and slightly curved. The length of each of the elements 20 is of the same order as that of the hood 2, while its width is slightly less than one third of that of the hood.
A first end of each of the elements 20 comprises a cylinder 21 for fixing the cover 2 of the clasp having a through hole 22 intended to cooperate with a bar 23. The latter has a length substantially equal to that of the cover and is adapted for also be inserted into corresponding holes 24 thereof and ensure the connection of the elements 20 to the latter.
The second end 25 of each of the elements 20 has a through hole 26 for cooperating with another bar 27 to make these ends 25 integral with one another.
The bar 27 is also adapted to engage in a tube 28 housed in a hole 29 formed in a first end 30 of a second blade 31 of the clasp, the latter being disposed between the elements 20. Thus, the second blade 31 is integral with the elements 20 by its first end 30, while being able to pivot relative thereto around the bar 27. The second blade 31 has a shape and dimensions similar to those of the elements 20. By elsewhere, the second blade 31 carries, at its second end, the tab 6 which has been described in connection with the description of FIG. 1. Thus, it is expected that the second blade 31 ensures the connection of the clasp to a bracelet by its second end.
The elements 20 and the second blade 31 are shown in FIG. 2, in relative positions that correspond to the closed or folded configuration of the clasp 1. It is understood that, conventionally, the clasp can be opened by a first rotation of the cover, and therefore of the double blade, around the bar 27 , the second blade remaining fixed, then by a second simultaneous rotation of the elements 20 around the bar 23 and the second blade 31 around the bar 27. Thus passes to the open configuration of the clasp in which its blades are deployed, this which makes it possible to increase the length of a bracelet, in particular to put it on a wrist.
By way of illustration, it is shown in FIG. 2, a locking assembly of the folding blades to ensure the stability of the closed configuration of the clasp 1.
The locking assembly comprises a locking mechanism secured to the cover 2 and for retaining a stud 32, in a predefined position near the hood, the stud being driven into the second blade 31. For this purpose, the latter has a head 33 in conventional form of mushroom. The locking mechanism comprises a base structure comprising two plates 34 and 35 made integral with the cover by means of a plurality of screws 36 and, secured to one another by means of additional screws 37.
The control buttons 5 are provided to actuate the locking assembly and release the stud 32 of the locking mechanism. For this purpose, each of the control buttons 5 is extended by an extension 38 having a notch 39 and is arranged between the two plates 34 and 35, being pushed towards the corresponding side face of the cover, under the effect of a spring 40. When the locking mechanism is assembled in the hood, the clasp being in its closed configuration, the notches 39 of the respective control buttons 5 are brought close to each other and accessible by respective openings 41, 42 of the platelets 34, 35. These openings being formed in the plates opposite the position of the pad 32, the head of the latter can engage in the openings to be blocked by the notches.
The control buttons 5 are then arranged projecting relative to the respective lateral faces of the cover. When a user exerts pressure on the control buttons, he brings them closer to one another, which causes the notches 39 to move relative to each other, thus freeing the head 33 of the stud 32, and thus the opening of the clasp 1.
It is noted in FIG. Andthat the conventional type arrangement of the clasp components provides sufficient space to accommodate a length adjustment device according to the present invention. The applications of such a device are multiple. For example, the possibility of making a fine adjustment of the length of a bracelet, without having to use a tool, in cases where the adjustment by adding / removing links is not sufficiently precise. Another possible application of the device according to the present invention relates to the implementation of the adjustment device on a particular type of wristwatch, namely on a watch for a plunger. It is common to provide a device for extending the length of the strap on such watches to allow them to be worn over a diving suit.
The length adjustment device comprises a support element 50 fixedly mounted on the frame 2 by means of two pairs of screws 51 and 52. The screws 52 have a longer length than the screws 51 to allow providing a pivot connection to the frame of a locking element 53. The latter comprises a base 54, having two cylinders 55, intended to cooperate with the screws 52 and, from which extend in the direction of the hood, two lateral claws 56 and a finger 57 of height greater than that of the claws. A spring 58 is interposed between the support element 50 and the base 54 to exert a force on the finger 57 tending to push it towards the hood.
Furthermore, the finger 57 has a height sufficient to cooperate with a control member 59 mounted in the upper face 3 of the cover by means of a hinge in which is engaged a rod 60. Thus, a force exerted on the control member by a user acts against the spring 58 to bring the claws 56 and the finger 57 of the support element 50 together.
A support member 61 carrying the second and third tabs 8 and 9 is provided to interact with the claws 56 and allow the adjustment of the length of the device according to the present invention. The support member 61 comprises an elongated plate 62, of curvature and width similar to those inside the cover 2. The plate 62 has a substantially rectangular and closed opening 63 in which the finger 57 of the locking element 53 is engaged when the assembly is assembled.
Thus, the finger 57 can cooperate with the control member 59 through the opening 63 and further fulfill a stop function for the support member 61 when pulled out of the hood 2, since the opening 63 is closed.
The plate 62 of the support member is provided with two teeth 64 formed on either side of the opening 63, on the face of the plate oriented in the direction of the claws 56 of the locking element 53 The teeth 64 extend in the longitudinal direction of the clasp and are adapted to cooperate with the claws 56 when the control member 59 is in its rest position, that is to say in the general plane of the face. upper clasp.
It is noted in Figure2que each of the teeth 64 has teeth 65 asymmetrical profile, the edge of each of the teeth located on the side of the tabs 8 and 9 of the strap attachment being substantially perpendicular to the longitudinal direction of the clasp, while the other edge has a large inclination.
With these characteristics, when the control member 59 is in its rest position, the cooperation of the teeth with the claws prevents any displacement of the support member 61 tending to drive it out of the clasp. Pressure on the control member 59 transmitted to the base 54, via the finger 57, causes the claws 56 to move away with reference to the teeth 64 and the release of the support member 61. The latter can then be pulled towards the outside of the hood to increase the distance between the tabs 8, 9 for attaching a bracelet strand to the fastening tab 6 of the other bracelet strand.
Conversely, if the user exerts a force on the support member tending to push in the hood 2, the inclined edges of the teeth 65 act on the claws 56 to rotate the locking member 53 by compressing the spring 58, even if no action is exerted on the control member 59. In this case, the locking element 53 acts on the support member 61 in the manner of a pawl to define stable positions . Thus, the adjustment device according to the present invention can be shortened by a simple pressure on the support member, from the fastening lugs 8 and 9, in the direction of the clasp.
In the preferred embodiment which has just been described, the cap 2 of the clasp forms a frame for the length adjustment device, while the support member 61 carries attachment means to the wristband while being mobile with respect to the clasp. Thus, the adjustment device makes it possible to directly adjust the length of the clasp 1 in this embodiment. It appears from fig. 2the integration of the adjustment device in the clasp 1 does not lead to an excessive increase in the thickness of the latter. The hood whose main function is the concealment of the folding blade mechanism also makes it possible to mask the length adjustment device advantageously.
Furthermore, the control member 59 preferably has a small thickness to be integrated in the upper face of the cover without inducing excessive thickness of the cover. This particular arrangement also provides great ease of handling because the surface of the control member 59 can be adapted to the dimensions of the cover in the general plane of the clasp and not along one of its lateral faces as is the case for the control buttons 5 of the folding blades. In addition, the respective manipulations, on the one hand, of the control member 59 and, on the other hand, the control buttons 5 are very clearly differentiated from one another.
Thus, the user of a bracelet clasp provided with an adjustment device according to the invention is not likely to confuse the two types of control member or manipulate them simultaneously inadvertently.
This adjustment device allows a user to easily adjust the length of his bracelet, without resorting to any tool, without having to remove his bracelet from his wrist. For example, one can simply pull the support member out of the hood until the finger 57 is disposed in abutment against the bottom of the opening 63, whether the bracelet is already worn or not. It then suffices to keep the clasp stationary while exerting pressure on the support element in the direction of the hood, to make it enter the latter, by sliding the teeth 64 on the claws 56 retracting, until the length of the bracelet reaches the level desired by its wearer.
The foregoing description attempts to describe a particular embodiment by way of non-limiting illustration, the invention being not limited, for example, to the implementation of the adjustment device in combination with a clasp, whether with folding blades or any other suitable type. In particular, it is possible to provide that the device according to the invention is integrated into an elastic strap that does not have a clasp, to improve its comfort. In this case, the device comprises its own means of attachment to the bracelet, such as the tabs 8 and 9, an element similar to the tab 6 of the clasp being also formed directly on the frame of the device.
Similarly, it can be provided that the teeth are disposed on the locking member 53 while the claws are disposed on the support member 61 without departing from the scope of the present invention. It could also provide the device with a single toothing associated with a single claw, alternatively.
The skilled person will not encounter any particular difficulty to make a number of additional current adaptations for the adjustment device to meet its own needs, without departing from the scope of the invention.