CH716561A1 - Clasp with locking system without extra thickness compared to a bracelet. - Google Patents

Abstract

The invention relates to a clasp (1) for a bracelet (4) comprising a base (7) intended to be connected to a first free end (4a) of the bracelet (4), an articulated intermediate part (9, 9a), at a first end, with the base (7) and, at a second end, with a flap (11, 11a), the latter being intended to be connected to a second free end (4b) of the bracelet (4) in order to allow the clasp (1) to move between an open position in which the base (7), the intermediate part (9, 9a) and the flap (11, 11a) are positioned substantially in an aligned manner and in extension of each other, and a closed position in which the base (7), the intermediate part (9, 9a) and the flap (11, 11a) are positioned substantially flush with each other to form a folding clasp. According to the invention, the clasp (1) comprises a locking system (13, 13', 13a, 13a') between two parts (7, 9, 9a, 11, 11a) of the clasp (1), and controlled by a unit (15, 15', 15a, 15a') for one-piece control with the flap (11, 11a) in order to selectively cause the clasp (1) to pass between the closed position in dimensional extension of the bracelet (4) and the open position.

Description

Description

TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to a clasp for a bracelet for a timepiece or an article of jewelery with a compact locking system.

TECHNICAL BACKGROUND OF THE INVENTION

[0002] It is already known, for a wristwatch, to use a clasp of the folding clasp type on a wristband in order to hold the watch on the wrist of a user. Thus, in the open position, the clasp offers a maximum length capable of forming a loop with the bracelet and the watch case of section large enough to introduce the user's hand then the wrist therein. The clasp is then manipulated in the closed position so that the clasp offers a minimum length capable of closing the loop with the bracelet and the watch case according to a section small enough to attach the wristwatch to the wrist of the user.

[0003] However, such a clasp, due to its complex geometry, generally has a greater thickness than the bracelet, which obliges manufacturers to have at least part of the clasp protrude inside the loop formed by the clasp, the bracelet and the case. which can make the attachment to the wrist imperfect or even mark the user's skin locally, causing pain.

[0004] In addition, such a clasp generally has either a control member which protrudes from the clasp which the user operates to unlock the clasp, or a pressure mechanism which locks in force by pressure of the user against the clasp to the wrist. In the first case, the control member offers easy opening but requires a cantilevered part capable of hooking with elements close to the wrist which can accidentally unlock the clasp and damage the member and/or the close element. It is for this reason that a clasp generally has two Organs.

[0005] In the second case, the clasp avoids any protruding part but it is difficult to open and close, in particular due to the absence of gripping means and the user can, by applying too great a force, accidentally bend the deformable part of the mechanism. pressure rendering the clasp unusable.

SUMMARY OF THE INVENTION

[0006] The object of the invention is to propose a clasp for a bracelet of the type with a folding clasp which offers a perfect buckle, that is to say without axial or radial extra thickness compared to a conventional bracelet, easy handling, c ie easy to open and close, and which offers no overhang in the closed position to provide improved integration of the clasp on the bracelet.

[0007] To this end, the invention relates to a bracelet clasp comprising a base intended to be connected to a first free end of the bracelet, an articulated intermediate part, at a first end, with the base and mounted, at a second end, with a flap, the latter being intended to be connected to a second free end of the bracelet in order to allow the clasp to evolve between an open position in which the base, the intermediate part and the flap are positioned substantially in an aligned manner and in extension of each other, and a closed position in which the base, the intermediate part and the flap are positioned substantially flush with each other in order to form a folding clasp, characterized in that the clasp comprises a system of locking between two parts of the clasp, and controlled by a one-piece control device with the flap in order to selectively move the clasp between the closed position in dimensional extension of the bracelet and the open position.

[0008] Advantageously according to the invention, the locking system is mounted between the parts of the clasp in order to provide a perfect buckle, that is to say without axial or radial extra thickness compared to a conventional bracelet. In addition, the parts being embedded between them, a one-piece control member guarantees easy handling, that is to say easy to open and close, without any overhanging part in the closed position being present.

[0009] The invention may also include one or more of the following optional features, taken alone or in combination.

[0010] The clasp may include a second locking system between the two parts of the clasp, and controlled by a second one-piece control device with the flap in order to selectively move the clasp between the closed position in dimensional extension of the bracelet and the position opened. It is thus possible to avoid the accidental unlocking of the clasp by forcing the actuation of the first and second control members to unlock the clasp.

[0011] The clasp may comprise a second intermediate part articulated, at a first end, with the base and mounted, at a second end, with a second flap, the second flap being intended to be connected to the first free end of the bracelet in order to to form a double folding clasp. It is thus possible to increase the difference in the length of the clasp between the open position and the closed position of the clasp compared to that with a simple folding clasp.

[0012] The clasp may comprise at least another two-piece locking system of the clasp, and controlled by another one-piece control device with the flap in order to selectively pass the clasp between the closed position in dimensional extension of the bracelet and the position opened. In a similar way to the first folding clasp, the second folding clasp can include one or more locking systems in order to offer a perfect buckle and easy handling without any overhanging parts and, possibly, avoiding accidental unlocking of the clasp by forcing the actuation of several Control Devices to unlock the clasp.

[0013] Each locking system may comprise an elastic interlocking device mounted between the two parts of the clasp in order to selectively snap the two parts of the clasp against each other in an elastic manner, and a control device comprising the control member and controlling the decoupling of the elastic interlocking device in order to allow the clasp to move from the closed position to the open position. It is immediate that no part undergoes plastic deformation which allows reliable operation of the clasp over time. In addition, all parts move relative to each other radially for locking and unlocking allowing for optimized compactness.

[0014] Each elastic interlocking device may comprise at least one elastic blade cooperating with at least one tenon-mortise assembly, which allows simple and robust locking.

[0015] Each elastic blade can be in one piece with a first piece of the clasp and can include the mortise. In addition, the tenon can be one-piece with the second piece. It is immediate that a clasp is thus obtained with very few parts, which makes its operation very reliable. In addition, the Organs being included in the thickness of each piece, the clasp is more compact which makes it easier to integrate it into a bracelet in order to obtain a perfect buckle, that is to say without axial or radial extra thickness by compared to a classic bracelet.

[0016] The control device may comprise at least one elastic blade cooperating with the control member which allows, like the elastic interlocking device, to obtain a clasp with very few parts which makes its operation very reliable. . In addition, the Organs being included in the thickness of each piece, the clasp is more compact which makes it easier to integrate it into a bracelet in order to obtain a perfect buckle, that is to say without axial or radial extra thickness by compared to a classic bracelet.

[0017] Finally, the invention relates to a bracelet comprising two free ends connected together by a clasp, characterized in that the clasp is as presented above.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features and advantages of the invention will emerge clearly from the description which is made of it below, by way of indication and in no way limiting, with reference to the appended drawings, in which:

- Figure 1 is a schematic view of a timepiece according to the invention;

- Figure 2 is a perspective view of a bracelet whose clasp according to the invention is in the closed position;

- Figure 3 is a perspective view of a bracelet whose clasp according to the invention is in the intermediate position;

- Figure 4 is a perspective view of a bracelet whose clasp according to the invention is in the open position;

- Figure 5 is a perspective view of a base of the clasp according to the invention;

- Figure 6 is a perspective view of an intermediate part of the clasp according to the invention;

- Figure 7 is a perspective view of a flap of the clasp according to the invention;

- Figure 8 is a bottom view of the clasp according to the invention in the closed position;

- Figure 9 is a sectional view along the plane IX-IX of Figure 7;

- Figure 10 is a sectional view along the X-X plane of Figure 8;

- Figure 11 is a perspective view of a bracelet part according to the invention.

DETAILED DESCRIPTION OF AT LEAST ONE EMBODIMENT OF THE INVENTION

In the various figures, identical or similar elements bear the same references, possibly with the addition of an index. The description of their structure and function is therefore not systematically repeated.

In all that follows, the terms of orientation are understood with respect to the orthogonal reference taken with reference to the bracelet 4, represented in Figure 2 and in which we distinguish:

- An axial direction A extending along the thickness, or height, of the strap 4;

- A radial direction R extending along the width, or depth, of the strap 4;

- A circumferential direction C extending along the curved length, or circumference, of the bracelet 4.

[0021] By "bracelet" 4 is meant all types of bands capable in cooperation with a clasp 1 of attaching to a member, such as a wrist or a neck, of a user to wear for example a piece watchmaking, an article of jewelery or an article of jewellery.

[0022] By "strip" is meant a long and narrow piece of a thin and flexible material making it possible to transmit or maintain a stress. Thus, one (or more) strip(s), composed(s) of metal (for example with articulated links) and/or leather and/or polymer and/or textile, can be used to form a bracelet 4.

[0023] By “piece of jewelry”, we mean all types of decorative or ornamental articles that may include a non-precious ceremonial stone such as a bracelet, a necklace, a belt, etc.

[0024] By "piece of jewelry", we mean all types of decorative or ornamental items that may include a precious or semi-precious stone such as a bracelet, a necklace, a belt, etc.

[0025] By “timepiece” 2 is meant all types of instruments for measuring or counting time such as clocks, clocks, watches, etc.

[0026] By "watch movement" 3 is meant all types of mechanism capable of counting time whether they are powered by mechanical energy (for example a barrel) or electric (for example a battery).

[0027] The invention relates to a bracelet 4 comprising two free ends 4a, 4b interconnected by a clasp 1 for carrying, for example, a timepiece, an article of jewelery or an article of jewellery. Of course, the bracelet can also be applied in other fields such as, for example, leather goods.

[0028] In the example illustrated in FIG. 1, the bracelet 4 is used to carry the timepiece 2 and in particular its timepiece movement 3 on the wrist of a user. More precisely, the invention comprises a clasp 1 comprising three main parts to form a folding clasp and, preferably in the example illustrated in FIGS. 2 to 8, five parts to form a double folding clasp.

According to the invention, the clasp 1 is preferably obtained by an additive manufacturing process such as three-dimensional printing followed by a finishing process in order to obtain a finished part without an assembly step. In fact, such a process allows layer-by-layer manufacture, making it possible in particular to manufacture the joints or the connections between the parts without a subsequent fitting or fixing step. Similarly, in the example illustrated in Figures 2 to 8, the first and second bands 5a, 5b of the bracelet 4 are, in a preferred way, obtained by an additive manufacturing process in particular so that all or part of the links of the first and second bands 5a, 5b of bracelet 4 are secured without fitting or fixing step.

The clasp 1 mainly comprises a base 7, an intermediate piece 9 and a flap 11. The base 7 is intended to be connected to a first free end 4a of the bracelet 4. In the example illustrated in Figures 2 to 8, the first free end 4a is formed on the first band 5a of the bracelet 4. It is understood that the other end of the first band 5a of the bracelet 4 can thus be attached to the case of a timepiece 2 or to an article of decoration of a piece of jewelry.

[0031] The intermediate part 9 is articulated, at a first end 10a, with the base 7 and mounted, at a second end 10b, with the flap 11. Preferably in the example illustrated in FIGS. form double pivot connections between, respectively, the intermediate part 9 and the base 7, and the intermediate part 9 and the flap 11. Of course, the flap 11 can also be mounted fixed on the second end 10b of the intermediate part 9 without depart from the scope of the invention.

[0032] Finally, the flap 11 is intended to be connected to the second free end 4b of the strap 4 to form a folding clasp. In the example illustrated in Figures 2 to 8, the second free end 4b is formed on the second band 5b of the bracelet 4. Thus, the other end of the second band 5b of the bracelet 4 being attached to the same case of a piece clockwork 2 or to the same decorative article of a piece of jewelry as that of the first strip 5a, the assembly forms a loop capable of being inserted around a member, such as the wrist or the ankle, of an user.

[0033] Thanks to its configuration, the clasp 1 can evolve between an open position in which the base 7, the intermediate part 9 and the flap 11 are positioned substantially in an aligned manner and in extension of each other as illustrated in the example of Figure 4, and a closed position in which the base 7, the intermediate part 9 and the flap 11 are positioned substantially flush with each other as illustrated in the example of Figure 2.

Advantageously according to the invention, the clasp 1 further comprises a locking system 13 between two parts of the clasp 1 such as, for example, the base 7 and the intermediate part 9 which is controlled by a one-piece control member 15 with the flap 11. It is thus possible, advantageously, to selectively pass the clasp 1 between the closed position in dimensional extension of the strips 5a, 5b of the bracelet 4 and the open position. More precisely, the locking system 13 is, advantageously according to the invention, mounted between the two parts of the clasp 1 by offering a perfect loop, that is to say without axial (direction A) or radial (direction R) extra thickness. compared to bands 5a, 5b of the classic bracelet 4. It is understood that no part of the clasp 1 protrudes inside the loop formed by the clasp 1, the bracelet 4 and the part to be supported, which improves the attachment to the member of the user and avoids pain in the area. clasp 1 when worn. In addition, the parts of the clasp 1 being fitted together, the one-piece control member 13 guarantees easy handling, that is to say that the clasp 1 is easy to open and close, without any part being worn. ä-false in the closed position is present.

In the example illustrated in Figures 2 to 8, the clasp 1 preferably comprises a second locking system 13 'between the same two parts such as, for example, the base 7 and the intermediate part 9, and controlled by a second Body 15 'one-piece control with the flap 11 in order to selectively pass the clasp 1 between the closed position and the open position in a manner similar to the first locking system 13 but being localized

in another place. It is thus possible to avoid the accidental unlocking of the clasp 1 by forcing the actuation of the first and second control members 15, 15' to unlock the clasp 1. Typically, in the rest position of the example of Figure 7, the control members 15, 15' are positioned laterally on the flap 11 and substantially aligned with axis B of the pivot connection between the flap 11 and the intermediate part 9 which is substantially parallel to the radial direction R.

[0036] Without departing from the scope of the invention and in a preferred manner according to the invention, the clasp 1 comprises a second intermediate part 9a articulated, at a first end, with the base 7 and mounted, at a second end, with a second flap 11a symmetrically with respect to the A-R plane passing through the center of the base 7 respectively with respect to the first intermediate part 9 and the first flap 11. Of course, the second flap 11a can be mounted fixed or articulated on the second end 10b of the intermediate piece 9 without departing from the scope of the invention.

[0037] The second flap 11a is connected to the first free end 4a of the bracelet 4 in order to form a double folding clasp. It is thus possible to increase the difference in the length of the clasp 1 between the open position and the closed position of the clasp 1 compared to that with a simple folding clasp.

[0038] Incidentally, in view of the explanation of the Single Folding Clasp Version, the clasp 1 in the Double Folding Clasp Version thus preferably comprises at least one other locking system 13a, 13a' between two identical or different parts such as, for example, the base 7 and the second intermediate part 9a, and controlled by another One-piece control member 15a, 15a' with the second flap 11a symmetrically with respect to the A-R plane passing through the center of the base 7 respectively with respect to the locking systems 13, 13' in order to selectively move the clasp 1 between the closed position in dimensional extension of the bracelet and the open position. In a similar way to the first folding clasp, the second folding clasp can include one (or more) locking system(s) 13a, 13a' in order to provide a perfect buckle and easy handling without any cantilevered parts. , possibly, avoiding the accidental unlocking of the clasp 1 by forcing the actuation of several control devices to unlock the clasp.

In the example illustrated in Figures 2 to 8, each locking system 13, 13', 13a, 13a' preferably comprises a device 14, 14', 14a, 14a' for elastic interlocking mounted between the two parts as , for example, the base 7 and the intermediate part 9, 9a in order to selectively bioquer the pieces elastically against each other. In addition, each locking system 13, 13', 13a, 13a' comprises a control device 16, 16', 16a, 16a' comprising the control member 15, 15', 15a, 15a' controlling the decoupling of the elastic interlocking device 14, 14', 14a, 14a' to allow clasp 1 to move from the closed position to the open position.

We can immediately understand that no part undergoes plastic deformation which allows reliable operation of the clasp 1 over time. In addition, all the parts move relative to each other radially in the direction R for locking and unlocking allowing optimized compactness.

In the example illustrated in Figures 2 to 8, each elastic interlocking device 14, 14', 14a, 14a' preferably comprises at least one elastic blade 17, 17', 17a, 17a' cooperating with at least one tenon assembly 18, 18', 18a, 18a' (visible in figures 4, 6 and 8) - mortise 19, 19', 19a, 19a' (visible in figures 3 to 5) which allows simple and robust locking. Of course, other types of elastic interlocking devices 14, 14', 14a, 14a' can be envisaged, such as the bayonet or pressure type, for example, without departing from the scope of the invention.

In the example illustrated in Figures 2 to 8, each blade 17, 17', 17a, 17a' elastic is one piece with the body 6 of the base 7 of the clasp 1 and includes the mortise 19, 19', 19a, 19a' dug laterally. As best seen in the example of Figure 5, the base 7, in a preferred manner, thus comprises an elongated main body 6, each end of which comprises a part of the joints with the intermediate parts 9, 9a.

[0043] The elastic blades 17' and 17a' are substantially aligned, run along the body 6 laterally and are each connected to one of the ends of the body 6. The free ends of the elastic blades 17' and 17a' are coupled using 'a crosspiece 20' of section along the plane R-C substantially U-shaped and each receive a mortise 19', 19a' on the face opposite to that along the body 6. This configuration forms a gap 21' between the blades 17' and 17a 'Elastics and the body 6 which widens in the concave part of the U-shape of the crosspiece 20'. Thanks to this configuration, it is understood that the radial forces (direction R) against the crosspiece 20' will cause a combined radial displacement of the free ends of the elastic strips 17' and 17a' and, incidentally, a displacement of the mortises 19', 19a'.

[0044] Similarly, the elastic strips 17 and 17a are substantially aligned, laterally run along the body 6 (on the opposite face where the strips 17' and 17a' run) and are each connected to one of the ends of the body 6. The free ends of the elastic blades 17 and 17a are coupled with the aid of a crosspiece 20 of section along the plane R-C substantially U-shaped and each receive a mortise 19, 19a (visible in particular in FIG. 3) on the face opposite to that along the body 6. This configuration forms a gap 21 between the elastic strips 17 and 17a and the body 6 which widens in the concave part of the U-shape of the crosspiece 20. Thanks to this configuration, understands that the radial forces (direction R) against the crosspiece 20 will cause a combined radial displacement of the free ends of the elastic strips 17 and 17a and, incidentally, a displacement of the mortises 19, 19a.

In the example illustrated in Figures 2 to 8, each tenon 18, 18', 18a, 18a' is preferably one-piece with an intermediate part 9, 9a. A clasp 1 is thus obtained with very few parts, which makes its operation very reliable.

In addition, the Organs being included in the thickness of each piece, the clasp 1 is more compact which makes it easier to integrate it into a bracelet 4 in order to obtain a perfect buckle, that is to say without axial extra thickness. nor radial compared to a conventional bracelet 4.

[0046] Of course, other types of configurations can be envisaged, such as for example a one-piece elastic blade 17, 17', 17a, 17a' with the intermediate piece 9, 9a and/or all or part of the tenons 18, 18 ', 18a, 18a' integral or one-piece with the intermediate piece 9, 9a and/or all or part of the mortises 19, 19', 19a, 19a' integral or one-piece with the intermediate piece 9, 9a without departing from the framework of the invention. It is understood, in no way limiting, that each pair of elastic interlocking device 14 -14' and 14a -14a' could include reverse layouts of the stenon sets 18 - 18' and 18a - 18a' - mortise 19 - 19' and 19a - 19a'.

[0047] Furthermore, the locking device 13, 13', 13a, 13a' cannot be limited to being mounted between the parts 7, 9, 9a of the clasp 1. Indeed, by adapting the geometry and the dimensions of the the example shown in Figures 2 to 11, the locking device 13, 13', 13a, 13a' could be mounted between the parts 7, 11, 11a or between the parts 9, 9a, 11, 11a without leaving the frame of the the invention. In no way limiting, an elastic blade on the flap 11, 11a could thus control at least one tenon - mortise assembly partly mounted on the base 7.

In the example illustrated in Figures 2 to 8, each device 16, 16 ', 16a, 16a' control comprises, preferably, at least one blade 23, 23 ', 23a, 23a' elastic cooperating with the 'organ 15, 15', 15a, 15a' control. More specifically, each flap 11, 11a comprises a substantially U-shaped body in the form of a base 8 and parallel flanges 8', 8", the latter receiving in a single piece an elastic strip 23, 23', 23a, 23a'. Each elastic blade 23, 23', 23a, 23a' is mounted, at a first end, cantilevered from a flange 8', 8" of the flap 11, 11a and receives, at a second end and in extension, its Body 15, 15', 15a, 15a' associated command. Thanks to this configuration and as better visible in FIG. 8, it is understood that the radial forces E (direction R) against the control members 15, 15', 15a, 15a' will be transmitted, in the closed position of the clasp 1, against the associated crosspieces 20, 20' which ultimately will lead to a radial displacement of the mortises 19, 19', 19a, 19a' capable of unlocking at the same time the systems 13, 13', 13a, 13a' for locking the clasp 1 between, by example, a user's thumb and index finger.

In order to make the clasp 1 as compact as possible, the parts are preferably embedded between them. Thus, in the example of clasp 1 in the closed position illustrated in FIGS. 2 and 8, each intermediate piece 9, 9a overlaps a part of the base 7 so that the latter is only visible level of its joints with parts 9, 9a, intermediate (see Figure 2). More specifically, the substantially parallel walls 12, 12' of intermediate parts 9, 9a, each receiving a tenon 18, 18', 18a, 18a', are adjusted against the blades 17, 17', 17a, 17a' of the base 7, each receiving a mortise 19, 19', 19a, 19a', so as to put them under stress to bioque each tenon 18, 18', 18a, 18a' in its associated mortise 19, 19', 19a, 19a' and thus making the systems 13, 13', 13a, 13a' for locking the clasp 1 active. In addition, in the example of clasp 1 in the closed position illustrated in FIGS. , 11a is positioned laterally on either side of the walls 12, 12' of its associated intermediate part 9, 9a, thus framing the rest of the clasp 1.

[0050] In order to be able to control the crosspieces 20, 20' of the base 7 using the control organs 15, 15', 15a, 15a' when the clasp 1 is in the closed position, each piece 9, 9a, intermediate comprises slots 22, 22' passing through the walls 12, 12' and communicating with the passages 24, 24' at right angles to the flaps 11, 11a bypassing the joints of the flaps 11, 11a with its associated intermediate parts 9, 9a (cf. figure 7). Consequently, in the closed position, the parts of the clasp 1 are completely embedded, which allows integration without axial (direction A) or radial (direction R) extra thickness with respect to the bands 5a, 5b of the bracelet 4.

It is immediate that each flap 11, 11a is mounted respectively between a band 5a, 5b of the bracelet 4 and an intermediate part 9, 9a without being blocked by any locking mechanism when the clasp 1 is in the closed position. This is made possible by the proximity of the systems 13, 13', 13a, 13a' for locking the clasp 1 with respect to the joints of the flaps 11, 11a with its associated part 9, 9a (made possible in particular by the reception of the joints in the widening of the interstices 21, 21' at the level of the crosspieces 20, 20') which makes the possibilities of movement of the flaps 11,11a very limited when the systems 13, 13', 13a, 13a' for locking the clasp 1 are active.

[0052] In addition, stop elements are provided to limit the embedding between the parts of the clasp 1. Thus, the embedding is limited by the contact of the crosspieces 20, 20 'with respectively the lights 22, 22' of the parts 9, 9a intermediate and the passage 24, 24 'at right angles of the flaps 11, 11a but also by the contact of the fingers 25, 25' of the intermediate parts 9, 9a respectively in the grooves 26, 26' of the flaps 11, 11a. It is understood that the parts of the clasp 1 are thus perfectly guided and positioned relative to each other, particularly in the closed position of the clasp 1.

Advantageously according to the invention, the bracelet 4 further comprises, in a preferred manner, an elongation system 31 mounted between the flap 11 of the clasp 1 and the second free end 4b on the second band 5b of the bracelet 4, which is controlled by a one-piece control unit 33 with the flap 11 in order to selectively change the length of the bracelet 4 while the clasp 1 is in the closed position and in dimensional extension of the rest of the bracelet 4. More precisely, the System 31 of elongation is, according to the invention, mounted between the pieces of bracelet 4 in order to provide a perfect buckle, that is to say without axial or radial extra thickness compared to a conventional bracelet 4. In addition, the pieces of the bracelet 4 being fitted together, a one-piece control unit 33 guarantees easy handling,

that is to say which makes it easy to lengthen and shorten the bracelet 4 even when it is attached to the wrist without any cantilevered part in the closed position of the clasp 1 being present. It is understood that no part of the bracelet 4 protrudes inside the loop formed by the clasp 1, the bands 5a, 5b and the part to be supported, which improves the attachment to the user's limb and avoids pain in the door.

In the example illustrated in Figures 2 to 11, the bracelet 4 preferably comprises a second elongation system 31' mounted between the flap 11 of the clasp 1 and the second free end 4b on the second band 5b of the bracelet 4, and controlled by a second one-piece control member 33' with the flap 11 in order to selectively change the length of the bracelet 4 while the clasp 1 is in the closed position and in dimensional extension of the rest of the bracelet 4. It is thus possible to avoid the accidental lengthening of the bracelet 4 by forcing the actuation of the first and second organs 33, 33 'of control to modify the length of the bracelet 4. Typically, in the rest position of the example of Figure 7, the Organs 33 , 33 'control are positioned laterally on the flap 11 at the opposite end receiving the Organs 15, 15' control systems 13, 13 'locking.

[0055] Without departing from the scope of the invention and in a preferred manner according to the invention, the bracelet 4 in the double folding clasp version comprises at least one other system 31a, 31a' for elongation mounted between the second flap 11a of the clasp

I and the first free end 4a on the first band 5b of the bracelet 4, which is controlled by a second unit 33a, 33a' of one-piece control with the second flap 11a symmetrically with respect to the A-R plane passing through the center of the base 7 respectively relative to the locking systems 31,31' in order to selectively change the length of the bracelet 4, in particular when the clasp 1 is in the closed position and in dimensional extension of the rest of the bracelet 4. In a manner similar to the first folding clasp, the second folding clasp can include one (or more) elongation system(s) 31a, 31a' in order to offer a perfect buckle and easy handling without any overhanging part and, possibly, avoiding elongation bracelet 4 accidentally by forcing the actuation of several control devices to modify the length of the bracelet 4.

In the example illustrated in Figures 2 to 11, each elongation system 31,31', 31a, 31a' preferably comprises a device 35, 35', 35a, 35a' for elastic coupling mounted between a flap 11, 11a of the clasp 1 and a free end 4a, 4b of the bracelet 4 in order to selectively lock, according to several positions and in an elastic manner, the flap 11,

It has the clasp 1 with respect to the free end 4a, 4b of the bracelet 4. 'elongation controls the disengagement of the device 35, 35', 35a, 35a' of elastic coupling in order to allow the elongation or the shortening of the bracelet 4 according to several predetermined lengths.

We can immediately understand that no part undergoes plastic deformation which allows reliable operation of the bracelet 4 over time. In addition, all the parts move relative to each other overlapping radially or circumferentially for the lengthening or shortening of the bracelet 4 which allows optimized compactness. Finally, the predetermined lengths allow the possibility of choosing several predetermined sections of the single or double folding clasp, i.e. several stable positions at different diameters allowing adaptation to a different user or to a variation in section of a member of the same user, for example because of the ambient heat or cold.

In the example illustrated in Figures 2 to 11, the elastic coupling device 35, 35', 35a, 35a' preferably comprises at least one elastic blade 37, 37', 37a, 37a' cooperating with at least one set notch 39, 39', 39a, 39a' - pin 38, 38', 38a' (one of the pins is not visible in the figures) which allows simple and robust engagement and disengagement. Of course, other types of elastic coupling devices 35, 35′, 35a, 35a′ can be envisaged, such as, for example, the stick or pressure type without departing from the scope of the invention.

In the example illustrated in Figures 2 to 11, the elastic blade 37, 37', 37a, 37a' is one-piece and cantilevered from a flange 8', 8" of the flap 11, 11a of the clasp 1 and comprises, in a preferred manner, the pin 38, 38', 38a' (one of the pins is not visible in the figures) and the control member 33, 33', 33a, 33a'. that the elastic blades 37, 37', 37a, 37a' of the device 35, 35', 35a, 35a' respectively face the elastic blade 17, 17', 17a, 17a' of the device 14, 14', 14a, 14a 'Elastic interlocking in the radial thickness of the flange 8', 8 "in which eile is present. In the example illustrated in FIG. 7, each control member 33, 33', 33a, 33a' extends substantially parallel with respect to its pin 38, 38', 38a' (one of the pins is not visible on the figures) associates. Thus, when a radial force E is applied to the control member 33, 33', 33a, 33a', this causes a substantially identical movement for its pin 38, 38', 38a' (one of the pins is not visible in the figures) associates.

[0060] In addition, the pin 38, 38', 38a' (one of the pins is not visible in the figures) cooperates with a rod 41, 41', 41a, 41a' provided with several notches 39, 39', 39a, 39a' which is preferentially integral with the free end 4a, 4b of the strap (as seen in the example of FIGS. 8 and 11). More precisely, each rod 41, 41', 41a, 41a' is received in the circumferential direction C in a cavity 43, 43', 43a, 43a' of the flap 11, 11a so that one of its notches 39, 39', 39a, 39a' cooperates with a pin 38, 38', 38a' (one of the pins is not visible in the figures) of the flap 11, 11a. The strip 5a, 5b then becomes integral with the clasp 1.

[0061] Thanks to this configuration and as better visible in FIG. 7, it is understood that the radial forces E (direction R) against the pairs of control members 33 - 33', 33a - 33a', regardless of the position of the clasp 1, causes a radial displacement of the pairs of pins 38 - 38', 38a' (one of the pins is not visible in the figures) in order to disengage at the same time two pairs of systems 31 - 31', 31a - 31a' elongation of the bracelet 4 between, for example, the thumb

Claims (10)

and a user's index. The latter by performing the displacement D (visible in Figure 2) between the clasp 1 and the rest of the bracelet 4 will perceive a vibration when each piece 38 - 38 ', 38a' (one of the pieces is not visible in the figures) will again be in another associated notch 39, 39', 39a, 39a'. The bracelet 4 then has a new stable length. It is immediate that it is thus obtained a bracelet 4 with very few parts which makes its use very reliable. In addition, the Organs being included in the thickness of each piece, the bracelet 4 is more compact which makes it easier to obtain a perfect buckle, that is to say without axial or radial extra thickness compared to the rest of the bracelet. bracelet 4. In the example illustrated in Figures 2 to 11, each rod 41, 41', 41a, 41a' has two notches 39, 39', 39a, 39a' in order to provide two stable positions in Cooperation with its pin 38, 38', 38a' (one of the pawns is not visible in the figures) associates. It is therefore understood that three predetermined lengths of the strap 4 are obtained thanks to the systems 31, 31, 31a, 31a' of elongation IIIustres in the figures. [0063]Of course, other types of configurations may be considered, such as all or part of the pins 38, 38', 38a' (one of the pins is not visible in the figures) integral or one-piece with the rod. 41, 41', 41a, 41a' and/or all or part of the notches 39, 39', 39a, 39a' integral or one-piece with the flap 11, 11a without departing from the scope of the invention. Similarly, a different number of notches 39, 39', 39a, 39a' on all or part of the rods 41,41', 41a, 41a' can be envisaged without departing from the scope of the invention to offer more or less of predetermined lengths of the bracelet 4. [0064] In addition, stop elements are provided to limit the displacement of the control organs 33, 33', 33a, 33a' and of the elongation system 31,31', 31a, 31a'. Thus, once the rod 41,41', 41a, 41a' has been received in a cavity 43, 43', 43a, 43a' of the flap 11, 11a, a pin or a screw (not visible) is mounted in each recess 46 (visible in Figures 7 to 9) of the flap 11, 11a in order to cooperate with the groove 47 (visible in Figure 11) of each rod 41, 41', 41a, 41a'. The latter can then only move along the groove 47 by limiting the movement of the elongation system 31,31', 31a, 31a'. [0065] In addition, the displacement of the control bodies 33, 33', 33a, 33a' by the sliding of the stops 48, 48', 48a, 48a' respectively in the grooves 49, 49', 49a, 49a' of the flaps 11, 11a and, possibly, by contact of the opposite faces of the control bodies 33, 33', 33a, 33a' against the wall 50, 50', 50a, 50a' surrounding the grooves 26, 26' of the flaps 11, 11a . It is understood that the Organs 33, 33 ', 33a, 33a' of control of the bracelet 4 are thus perfectly guided whatever the Position of the clasp 1. [0066] The installation of the locking systems 13, 13', 13a, 13a' and of the systems 31, 31', 31a, 31a' is therefore particularly advantageous by virtue of its compactness, leaving a great aesthetic freedom to the bracelet 4, by its control grouped on the flap 11, 11a making the clasp 1 simple to handle and by the number of functions grouped together on the same bracelet 4. [0067] The invention is not limited to the embodiments and variants presented and other embodiments and variants will appear clearly to those skilled in the art. Thus, the embodiments and variants can be combined with each other without departing from the scope of the invention. [0068] As explained above, the invention cannot be limited to the example illustrated in FIGS. a single System 13, 13', 13a, 13a' for locking and/or a single System 31, 31', 31a, 31a' for elongation without departing from the scope of the invention. Furthermore, the bodies 15, 15', 15a, 15a', 33, 33', 33a, 33a' could be of different shapes and sizes without losing the advantages of the invention. Claims 1. Clasp (1) for bracelet (4) comprising a base (7) intended to be connected to a first free end (4a) of the bracelet (4), an articulated intermediate part (9, 9a), at a first end, with the base (7) and mounted, at a second end, with a flap (11, 11a), the latter being intended to be connected to a second free end (4b) of the bracelet (4) in order to allow the clasp (1 ) to move between an open position in which the base (7), the intermediate part (9, 9a) and the flap (11, 11a) are positioned substantially in an aligned manner and in extension of each other, and a closed position in which the base (7), the intermediate part (9, 9a) and the flap (11, 11a) are positioned substantially flush with each other to form a folding clasp, characterized in that the clasp (1) comprises a locking system (13, 13', 13a, 13a') between two parts (7, 9, 9a, 11, 11a) of the clasp (1), and controlled by a member (15, 15', 15a, 15a' ) one-piece control with the flap (11, 11a) in order to selectively pass the clasp (1) between the closed position in dimensional extension of the bracelet (4) and the open position. 2. Clasp (1) according to the preceding claim, comprising a second system (13, 13 ', 13a, 13a') for locking between two parts (7, 9, 9a, 11, 11a) of the clasp (1), and control by a second Body (15, 15', 15a, 15a') of one-piece control with the flap (11, 11 a) in order to selectively pass the clasp (1) between the closed position in dimensional extension of the bracelet (4) and the open position. 3. Clasp (1) according to claim 1 or 2, comprising a second intermediate part (9, 9a) articulated, at a first end, with the base (7) and mounted, at a second end, with a second flap (11 , 11a), the second flap (11, 11a) being intended to be connected to the first free end (4a) of the bracelet (4) in order to close a double folding clasp. 4. Clasp (1) according to the preceding claim, comprising at least another locking system (13, 13', 13a, 13a') between two parts (7, 9, 9a, 11, 11a) of the clasp (1), and control by another body (15, 15 ', 15a, 15a') of one-piece control with the second flap (11, 11a) in order to selectively pass the clasp (1) between the closed position in dimensional extension of the bracelet (4 ) and Open Position. 5. Clasp (1) according to one of the preceding claims, wherein each locking system (13, 13', 13a, 13a') comprises a device (14, 14', 14a, 14a') for elastic interlocking between the two parts (7, 9, 9a, 11, 11 a) of the clasp (1) in order to selectively bioquer in an elastic way the two parts (7, 9, 9a, 11, 11a) of the clasp (1) one against the other, and a control device (16, 16', 16a, 16a') comprising the control member (15, 15', 15a, 15a') controlling and controlling the decoupling of the device (14, 14', 14a, 14a') of elastic interlocking in order to allow the clasp (1) to move from the closed position to the open position. 6. Clasp (1) according to the preceding claim, wherein each device (14, 14', 14a, 14a') for elastic interlocking comprises at least one blade (17, 17', 17a, 17a') elastic cooperating with at least one tenon (18, 18', 18a, 18a') - mortise (19, 19', 19a, 19a') assembly. 7. Clasp (1) according to the preceding claim, wherein each blade (17, 17 ', 17a, 17a') one-piece elastic with a first part (7, 9, 9a, 11, 11 a) of the clasp (1) comprises the mortise (19, 19', 19a, 19a') and in which the tenon (18, 18', 18a, 18a') is integral with the second piece (7, 9, 9a, 11, 11a). 8. Clasp (1) according to any one of claims 5 to 7, wherein the control device (16, 16', 16a, 16a') comprises at least one blade (23, 23', 23a, 23a') elastic cooperating with the control member (15, 15', 15a, 15a'). 9. Clasp (1) according to any one of the preceding claims, wherein the locking system (13, 13', 13a, 13a') is mounted between the base (7) and the intermediate part (9, 9a). 10. Bracelet (4) having two ends (4a, 4b) free interconnected by a clasp (1), characterized in that the clasp (1) is according to one of the preceding claims.