EP3417734B1 - Bracelet clasp comprising a device for adjusting the length of the bracelet - Google Patents

Description

Technical area

The present invention relates to the field of bracelets, in particular for watches. It relates to a clasp for a bracelet making it possible to adjust the length of the bracelet. The invention also relates to a length adjustment device and a wristwatch comprising the clasp and / or the length adjustment device.

State of the art and problems giving rise to the invention

A wristwatch clasp generally comprises two fasteners for attaching the free ends of the bracelet, and a locking or closing mechanism for locking the two fasteners, and thus the free ends of the bracelet, in a stable closed position. or locking. This position also constitutes the service position, since it allows the wristwatch to be worn on the wrist. There are a multitude of types of clasps, for example the pin buckle or even the folding clasps, the aesthetics of which are well appreciated.

Clasps and bracelets for wristwatches generally include means for adjusting the length of the bracelet. Typically in the case of leather or plastic bracelets, the free end of one of the two strands of the bracelet has a series of holes distributed in the longitudinal direction of the bracelet. The free end of the other strand of the bracelet is provided with a connection device, for example a pin buckle, making it possible to join the two strands by inserting the pin in the hole corresponding to the desired length. In the case of metal link bracelets, the length of the bracelet is adjusted by removing or adding a link in one or both strands of the bracelet.

Wrist size varies greatly from wearer to wearer. On the other hand, as raised in the documents CH 704 335 and CH 705149 , a wearer's wrist size may vary with changes in temperature. The same wearer may therefore wish to regularly finely adjust the length of the bracelet in order to be perfectly comfortable. The state of the art knows clasps for wristwatches which allow fine adjustment of the length of the bracelet. This is a mechanism designed to allow modification of the circumference defined by the watch case, the bracelet, and the clasp, when the clasp is closed, in order to adapt this circumference to the size of the wrist of an individual wearer. This modification takes place on a smaller scale than that defined by the spacing of the holes in a strand of a leather strap or by the links of a metal bracelet, for example. Fine adjustment is desirable to precisely match the aforementioned circumference to the wrist of each wearer.

In some cases, the fine adjustment device of a bracelet clasp comprises a movable part arranged on a part of the clasp and carrying one of the two fasteners, the other fastener being attached to another part of the clasp. . The fine adjustment can be carried out by moving the movable part relative to the whole of the clasp, and by locking it in the position corresponding to the desired strap length. Often, the fine adjustment device has a detent or toothing, which defines the discrete length positions of the fine adjustment. The notching can also be part of the device making it possible to block the moving part in a position of desired length.

The document CH 704 335 discloses a folding clasp, in which a fastener is attached to a carriage arranged to slide in a housing arranged on a blade of the clasp. The clasp comprises a pull tab arranged to cooperate with the carriage and capable of occupying two axial positions so that the carriage is blocked and released when the pull tab is respectively in one and the other of the two axial positions. A drawback of this mechanism is the fact that at least one of the two opposite pushers of the pull tab is protruding from the side walls of the blade of the clasp. The protruding pusher is capable of catching on an external object, for example on a garment.

As mentioned in the documents CH 704 335 , EP2452583 and CH700230 , it may be desirable that the strap length can be adjusted regardless of the state - closed or open - of the clasp.

Other objectives relate to the aesthetic aspect of the clasp. For example, an objective of the present invention is to reduce the thickness, that is to say the extension of the clasp in a radial direction with respect to the axis of the wrist of a wearer. The greater the thickness, the more bulky the clasp becomes. This problem is accentuated when choosing the positioning of the length adjustment mechanism relative to the entire clasp, this mechanism usually requiring access from the outside to allow a user to activate the setting. In many cases, the presence of a length adjustment mechanism increases the dimensions of the bracelet.

Another object of the invention is to reduce the weight of the clasp, for example to reduce the amount of metal used in the manufacture and to make the clasp easier to wear.

In several clasps of the state of the art, for example those described in the documents EP2452583 and CH 698981 , the fine adjustment device is arranged in a yoke or a top cover, which contributes to the increase in thickness and to the general size of the clasp.

In the context of aesthetics, it would also be desirable to reduce the visibility of the length adjuster. For example, in the document CH704 335 , mentioned above, the movable part is arranged at one end of a blade of the clasp so as to extend beyond the end of the blade when the bracelet is extended. In this case, the movable part becomes visible as an extension of the clasp. An objective of the invention is to provide a clasp making it possible to adjust the length without this changing the appearance of the clasp from the outside.

Still from an aesthetic point of view, a clasp whose adjustment mechanism remains discreet and fits into the general shape of the clasp may be desirable. For example, one objective is to avoid the presence of notches visible from the outside or else of longitudinal openings arranged along a side wall of a yoke of a folding clasp.

An objective of the present invention is to present a clasp making it possible to activate the length adjustment when the clasp is closed, and this preferably without a dedicated and distinct actuating member, such as a pusher, a pull tab or still a slide is visible from the outside when the clasp is closed.

Summary of the invention

According to one aspect, the present invention relates to a clasp for bracelets of the type comprising first and second free ends, the clasp comprising first and second bracelet fasteners intended to be made respectively integral with said first and second free ends of the bracelet.

The subject of the present invention is a clasp with a folding clasp for a bracelet allowing adjustment of the length of the bracelet, said clasp comprising the technical characteristics of claim 1.

According to one aspect, the present disclosure relates to a clasp allowing adjustment of the length of the bracelet, said clasp comprising: a first blade and at least one second blade, articulated with respect to one another, the second blade comprising two side rails; a first fixing member connected to the first blade and intended to be made integral with a first free end of the bracelet; a second fixing member intended to be made integral with a second free end of the bracelet; a locking mechanism arranged to immobilize said first and second blades in the closed position of the clasp when said first and second blades are brought together and folded towards each other; a device for adjusting the length of the bracelet comprising: a movable part to which said first fixing member is attached, said movable part being arranged so as to be able to move longitudinally with respect to the longitudinal direction of the bracelet to effect a length adjustment ; and a blocking device arranged to block the movement of the movable part in at least one direction of longitudinal movement.

According to one aspect, the present disclosure relates to a clasp allowing adjustment of the length of the bracelet, said clasp comprising: a first blade and at least one second blade articulated with respect to one another, the second blade comprising two side spars; a first fixing member connected to the first blade and intended to be made integral with a first free end of the bracelet; a second fixing member intended to be made integral with a second free end of the bracelet; a locking mechanism arranged to maintain said first and second blades in the closed position of the clasp when said first and second blades are brought together and folded towards each other, a central support structure integral with said first blade or formed in one piece with said first blade; a device for adjusting the length of the bracelet, integrated and / or mounted in said central structure, the adjusting device comprising: a movable part to which said first fixing member is attached, said movable part being arranged on said support structure so as to be able to move longitudinally with respect to the bracelet to effect a length adjustment; a blocking device arranged to block the movement of the movable part in at least one direction of longitudinal movement; an actuating member arranged to allow the unlocking of the locking mechanism and the displacement of the movable part and thus the length adjustment; said movable part is housed in a free end of said central structure in order to be able to emerge from said end or be inserted into said end during said longitudinal displacement.

According to one aspect, the present disclosure relates to a clasp with a folding clasp for a bracelet allowing adjustment of the length of the bracelet, said clasp comprising at least two blades articulated with respect to each other, at least one of said blades comprising a part comprising a non-metallic material or the entire blade comprising a non-metallic material.

Other aspects of the invention and preferred embodiments are defined in the claims and in the description which follows.

Brief description of the drawings

• La figure 1 est une vue en perspective du dessus d'un fermoir de bracelet selon un mode de réalisation de la présente invention. Le fermoir est montré en position fermée.
• La figure 2 est une vue en perspective du dessous du fermoir de la figure 1 montré en position fermée.
• Les figures 3 A et 3 B sont des vues latérales en élévation du fermoir selon la figure 1 en position ouverte et fermée, respectivement.
• La figure 4 est une vue en perspective du dessus du fermoir de la figure 1 en position ouverte, les lames du fermoir étant complètement déployées.
• La figure 5 est une vue en perspective-dessous du fermoir de la figure 1 en position ouverte, les lames du fermoir étant complètement déployées.
• Les figures 6 A et 6 B sont, respectivement, une vue en perspective en contre plongée (A) et une vue en perspective en plongée(B) du fermoir de la figure 1 montré en position ouverte.
• Les figures 7 A et 7 B sont, respectivement, une vue en perspective (A) et une vue de dessous (B), de la structure centrale du fermoir de la figure 1.
• La figure 8 est une vue en perspective d'une partie d'une lame inférieure du fermoir de la figure 1.
• Les figures 9A, 9B et 9 C sont des vues en coupe longitudinale montrant le dispositif de réglage de longueur du fermoir des figures 1 à 8 respectivement en position de repos (9A) et en position activée (9B).
• La figure 10 est une vue en perspective d'une lame du fermoir comportant le dispositif de réglage fin.
• Les figures 11 A et 11 B sont des vues de dessus (A) et de dessous (B) du fermoir de la figure 1, montrant le dispositif de réglage de longueur en position activée par l'intermédiaire du mécanisme de verrouillage du fermoir. Dans ces figures, quelques éléments du fermoir ont été omis.
• La figure 11C est une vue partielle agrandie de la partie entourée par un cercle dans la figure 11B, montrée par le cercle dans cette dernière figure.
• La figure 12 est une vue en perspective du fermoir, dans laquelle, pour l'amélioration de la compréhension, quelques éléments structuraux sont transparents et d'autres sont colorés en plus foncé.
• La figure 13 est une vue en perspective d'un fermoir selon un deuxième mode de réalisation La figure 14 est une vue en perspective d'une pièce du fermoir montré à la figure 13.
• La figure 15 est une vue en perspective d'un fermoir selon un troisième mode de réalisation.
• La figure 16 est une vue en perspective du fermoir montré à la figure 15, dans lequel quelques éléments ont été omis.

The characteristics and advantages of the invention will emerge more clearly on reading the description of three preferred embodiments, given solely by way of non-limiting examples with reference to the figures in which:

• The figure 1 is a top perspective view of a bracelet clasp according to one embodiment of the present invention. The clasp is shown in the closed position.
• The figure 2 is a perspective view of the underside of the clasp of the figure 1 shown in closed position.
• The figures 3 A and 3 B are side elevational views of the clasp according to figure 1 in open and closed position, respectively.
• The figure 4 is a perspective view from above of the clasp of the figure 1 in open position, the clasp blades being fully extended.
• The figure 5 is a perspective view below the clasp of the figure 1 in the open position, the clasp blades being fully extended.
• The figures 6 A and 6 B are, respectively, a perspective view from above (A) and a perspective view from above (B) of the clasp of the figure 1 shown in open position.
• The figures 7 A and 7 B are, respectively, a perspective view (A) and a bottom view (B), of the central structure of the clasp of the figure 1 .
• The figure 8 is a perspective view of part of a lower blade of the clasp of the figure 1 .
• The figures 9A, 9B and 9 C are longitudinal sectional views showing the device for adjusting the length of the clasp of the figures 1 to 8 respectively in rest position (9A) and in activated position (9B).
• The figure 10 is a perspective view of a blade of the clasp comprising the fine adjustment device.
• The figures 11 A and 11 B are views from above (A) and from below (B) of the clasp of the figure 1 , showing the length adjuster in the activated position via the clasp locking mechanism. In these figures, some elements of the clasp have been omitted.
• The figure 11C is an enlarged partial view of the part surrounded by a circle in the figure 11B , shown by the circle in this last figure.
• The figure 12 is a perspective view of the clasp, in which, for better understanding, some structural elements are transparent and others are colored darker.
• The figure 13 is a perspective view of a clasp according to a second embodiment The figure 14 is a perspective view of a part of the clasp shown on figure 13 .
• The figure 15 is a perspective view of a clasp according to a third embodiment.
• The figure 16 is a perspective view of the clasp shown in figure 15 , in which some elements have been omitted.

Description of the embodiments

The present invention relates to a clasp, in particular a clasp for a bracelet. According to a preferred embodiment, the invention relates to a clasp for a bracelet of a timepiece, preferably for a wristwatch. The bracelet may be of any type, such as for example of flexible plastic material, of leather, or comprising an assembly of links, for example metallic.

In general, the bracelet consists of two longitudinal portions of the bracelet, respectively in the form of first and second strands (not shown), and each of the strands is such that one of its ends is connected to the watch case while that the other is intended to be attached to a fastening member of the clasp. As indicated above, in the case of a pin buckle, the end of one of the two strands has a series of holes, and the length is adjusted roughly by choosing the hole in which the pin is inserted. To describe the invention with reference to the figures, the expressions "direction of the length of the bracelet" or "longitudinal direction of the bracelet" are used to designate an axis which is that of the two bracelet strands, assuming that the bracelet is placed flat. and detached from a watch. When the bracelet is closed, the "bracelet length direction" refers to the line that follows the circumference of the bracelet. The bracelet length adjusted by fine adjustment with the aid of the clasp adjusting device according to the invention lies in the direction of the length of the bracelet. In the case of a conventional dial wristwatch, an axis connecting the numbers 6 and 12 of the dial generally follows the direction of the strap length in accordance with this definition.

If you ignore the locking mechanism of the length adjuster, the clasp shown in the figures is substantially symmetrical and therefore comprises a plane which would constitute if the clasp is perfectly symmetrical. In the present description, this plane which extends in the direction of the length of the bracelet and of the clasp is considered as "plane of symmetry", even if the symmetry of the clasp is not perfect, for example due to the positioning of the device. length adjustment and its locking mechanism.

The term "orthogonal" refers to an axis which is perpendicular to the "direction of the length of the bracelet" and perpendicular to the plane of symmetry of the clasp. In the case of a dial wristwatch, an axis connecting the numbers 3 and 9 of the dial has an "orthogonal" direction in accordance with this definition.

A "radial" axis is an axis which is radial with respect to the axis of the wrist or the forearm of a wristwatch wearer. The radial axis extends in the plane of symmetry or in a plane parallel to the plane of symmetry. In view of the figure 3B , the "radial" axis is a substantially "vertical" axis, and the two terms are used interchangeably in this specification.

The terms "bottom" and "top" generally refer respectively to the bottom and the top of the clasp as shown on figure 3B . The expressions "below" and "above" are to be understood in a similar manner, the structural elements close to the wrist being below the elements further away.

If the expressions "longitudinal direction of the bracelet", "orthogonal" and "radial" refer to the orientation of an element of the clasp or of an axis of this element, these expressions generally relate to the orientation of the element or of its axis when the clasp is closed.

According to one embodiment, the clasp of the invention is a clasp of the folding type, a folding clasp or a folding clasp. This type of clasp is known, for example, from patent documents EP 0913106 , CH700230 , EP2452583 , EP2361523 and CH704335 . The clasp has at least two longitudinal clasp segments. In the present description, these longitudinal segments are also called "the blades" of the clasp. Usually, a clasp has two or three longitudinal segments. The clasps shown in the figures are clasps with two blades 1, 2. Of course, it would be quite possible to make the clasp of the invention with a folding clasp with three. blades or with a pin buckle type clasp only. The present invention also contemplates clasps which combine the features of a folding clasp with a bracelet strand attachment known from the pin buckle. A clasp of the pin buckle type in the absence of a folding buckle corresponds to one embodiment of the invention.

Indeed, those skilled in the art will understand that the device for fine adjustment of the length of the bracelet according to the invention can be adapted to any type of clasp and is not limited to a particular type of clasp.

The clasp shown in the figures comprises a first blade 1 and a second blade 2, articulated with respect to one another at a first end. When the clasp is closed, the blades 1, 2 are brought together and folded over one another as shown in figures 1, 2, 3B , 11A, 11B .

The blades 1, 2 are of elongated shape in the longitudinal direction of the bracelet and slightly curved to better match the shape of the wrist of a wearer. The first blade 1 comprises a lower surface 44 ( figure 2 ), intended to be in front of the wrist of the wearer, and an upper surface 21 ( figure 4 ).

The clasp of the invention comprises a locking mechanism 3 making it possible to lock the clasp in the closed position, and to unlock the clasp in order to go into the open position ( figures 3A , 4 , 5 , 6A, 6B ) to remove the watch from your wrist. Locking means for folding clasps are known per se.

In a variant, the locking mechanism is based on the presence of a latching mechanism, for example formed by extra thicknesses and possibly by recesses, respectively, on the first and second blade. In this case, a user acts directly on a blade in order to exert the force necessary to separate the blades or to lock them by interlocking them, for example. The downside of this mechanism is that wear can make the snap-fit less effective. On the other hand, there is always the risk of accidental opening with this type of closure.

In a preferred embodiment, the clasp of the invention comprises a locking mechanism. locking comprising a handling member arranged so that activation of this member is necessary to open the clasp. The advantage of this type of mechanism is that accidental opening is excluded. The mechanical principle of the locking mechanism 3 of the clasp shown in the figures is similar to that disclosed in the European patent EP0913106B .

The locking mechanism 3 preferably comprises two lateral manipulation members, a first manipulation member 7 and a second manipulation member 7 '. To unlock the clasp, a wearer simultaneously activates the two members 7, 7 '. These handling members 7, 7 'project from each side of the frame 20, in which they are guided and / or housed. This frame is preferably arranged at the second end of the first blade 1. Instead of a frame, it is possible to provide a yoke, a loop as shown in figure 14 , or a cover, as shown in the patent EP0913106B to engage the pushers. It should be noted that the second fixing member, not shown, is preferably attached to the frame 20. It may be a spring bar held, for example, between two side walls of the frame or of the yoke. In the figures 1 and 6B , a hole 45 is visible on the inside face of a side wall of the frame 20, making it possible to house the spring bar together with a corresponding hole arranged on the opposite wall (not visible). On its upper face, the frame 20 of the clasp shown in the figures comprises a recess 46, designed to insert the manufacturer's logo, for example.

Due to the general symmetry of the clasp of the invention, several elements are arranged in pairs in the clasp, on either side of the plane of symmetry. This specification generally uses a single reference number to denote elements present in pairs, unless separate reference numbers are appropriate, for example due to asymmetries of the locking device or for the more detailed description of certain features.

Each of the handling members 7, 7 'is connected to one of the two side rails, 14, 14' of the second blade 2. In the embodiment shown, the connection (not visible) between the side members and their respective handling members is located at the second end of the second blade, in the frame 20. In fact, each of the two handling members 7, 7 'can be integral with one of the two side rails. Towards the second end of the first blade 1, the side members 14, 14 'are not rigidly connected to one another, but are engaged in the frame 20 so as to be able to move slightly in the general plane of the clasp, in an orthogonal direction. This freedom of movement can come from the flexibility of the side members, or at least from the second end thereof. In the clasp shown in the drawings, the two side members 14, 14 'are two separate pieces, secured with the articulation of the second blade, towards the first end. In another embodiment, illustrated in the document EP0383039 , the two side members 14, 14 'are rigidly connected to a common base, generally close to the first end, but they have free ends, which can move with respect to each other due to the flexibility of the side members . The frame 20 further comprises return means, for example a spring, which urge the handling members 7, 7 'as well as the side members 14, 14' towards the locking position, generally the outer lateral positions of the side members. The return means are not visible in the drawings, because they are integrated into the frame 20. The return means are thus arranged so as to hold the members 7, 7 'in a position remote from each other. .

In the embodiment shown, the handling members 7, 7 'are made in the form of pushers 7, 7'. By holding the pushers 7, 7 'between the thumb and forefinger and by pressing, a wearer brings the pushers and the side members 14, 14' closer together.

In one embodiment, the locking mechanism 3 comprises at least two hooking members or complementary hooking members 22, 23, a first form of stop 22 disposed on the first blade 1 and a second form of stop 23 disposed on the second blade 2, said stop forms 22, 23 being arranged so as to lock the clasp in the closed position when the stop forms 22, 23 are engaged. Activation of the handling member 7, 7 'causes the disengagement of said complementary stop forms 22, 23 in order to unlock the locking mechanism 3. Preferably, the first stop form 23 is arranged on the side member 14. , and the latter is arranged to act on the actuating member 9 when the clasp is closed and when the handling member 7 is activated by a user, as will be described below.

Each spar 14, 14 'has, on its outer side, a projecting member in the form of a hook 23 ( figures 4 , 6A ). A recess or a corresponding stop surface 22 ( figures 4, 5 ) is provided in the inner side of each side member 15, 15 'of the first blade 1, to receive the hook 23 when the second blade 2 is completely folded over the first blade 1. The hooks 23 have rounded shapes below and flattened retention surfaces extending in a plane perpendicular to the plane of symmetry of the clasp. The surfaces of the recesses 22 in contact with the retaining surfaces of the hooks 23 are also flattened and perpendicular to the plane of symmetry of the clasp. Thanks to the rounded lower side, the hooks 23 ensure an automatic locking with positive engagement, when the second blade 2 is pressed towards the first blade 1, even if the pushers 7, 7 'are not depressed. Accidental opening of the clasp is prevented by virtue of the complementary flattened surfaces, as long as the side members 14, 14 'have not been brought closer to the second blade 2 by activating the pushers 7, 7'.

One of the differences of the clasp shown compared to the clasp of EP0913106B relates to the fact that the side members 14, 14 'of the second blade 2 are not inserted between the sides of the side members 15, 15' of the first leaf 1. In the clasp according to an embodiment of the invention, the side members 14, 14 'are placed at least partially above the side members 15, 15' of the first blade when the clasp is closed. Each of the hooks 23 is disposed laterally on a bulge 24 located on the underside of the spar 14, so that the hook is at a lower level with respect to the general plane of the spar 14 ( figure 6A ). On the other hand, the first blade 1 comprises, at its second end, an extension forming a frame 18 provided to receive and / or guide the end of a bracelet strand. This frame has two lateral extensions 28 connected towards their ends by a transverse plate 29 ( figures 4 and 8 ). The lateral extensions 28 comprise a structure 31 in elevation with respect to the upper surface of the first blade. The surfaces of the recess 22 are arranged on the interior face of the structure 31 in elevation, so as to be disposed above the general plane of the first blade. In fact, the bearing surfaces of the hooks 23 are located in the same plane as the lower surfaces of the side members 14, 14 '. The bearing surfaces in the recesses 23 are located in the same plane as the upper surfaces 21 of the first blade 1. It will emerge from the remainder of the description that these characteristics contribute to the implementation of a particularly light and low clasp. bulky.

The present invention also covers a variant of the locking mechanism 4, according to which the side members 14, 14 'are arranged so as to move away or to move away during the activation of the manipulation member 7, 7'. , in order to unlock the locking mechanism.

According to yet another variant, one or both handling members 7, 7 'are arranged so as to be pulled, instead of being pushed in, in order to allow movement of the side members 14, 14' and thus the unlocking of the locking mechanism. . The handling member (s) is / are then preferably made in the form of a pull tab rather than a pair of pushers. In this case, it can also be a movement of spacing or a bringing together of the side members 14, 14 'causing the unlocking. In all cases, the presence of return means, such as a spring, is preferred, in order to urge the clasp in the locked position in the absence of activation of the handling member 7, 7 '.

In one embodiment, it is envisioned that the parts containing the side members 14, 14 'as well as the handling members 7, 7', intersect inside the frame 20, so that each side member is connected to the manipulator on the opposite lateral side ( figure 13 ). In this case, the side member 14 is preferably connected to the handling member 7 ', and the side member 14' to the member 7. In this embodiment, the handling member and the corresponding side member are preferably made of also a room. According to this variant, the handling members 7, 7 'can be made in the form of pushers, and the activation of these handling members can cause the longitudinal members 14, 14' to move apart.

The clasp of the invention comprises a device for adjusting the length 4 of the bracelet. It is preferably a device allowing fine adjustment of the length. By “length adjustment” or “fine length adjustment” is meant a device making it possible to adjust the circumference defined by the case of a watch, the two bracelet strands and the clasp. The aim is to allow a wearer to adjust this circumference so that the wearer is most comfortable when wearing the wristwatch having the clasp on his wrist. The fine adjustment of the length results in a tightening or loosening of the strap at the wrist, depending on whether the length is shortened or lengthened. This latter adjustment can be made on a smaller and more precise scale than the adjustment by adding or removing a link from a metal bracelet or by inserting the barb or tenon into another. hole in the case of a pin buckle, for example. In the state of the art, the expression "adjustment of the useful length of the bracelet" is also used.

In the clasp shown in the figures, the adjustment device 4 is integrated into a central support structure 6 of the clasp. The central support structure 6 is integral with the first blade 1, but could also be formed integrally with the first blade 1. In a embodiment, the support structure 6 constitutes the first blade 1.

The adjustment device 4 comprises a part or movable part 5 to which the first fixing member 11 is attached. This member is intended to be made integral with a first free end of the bracelet. In the embodiment shown, the first fixing member comprises two tenons 11, intended to be inserted into the holes provided in the free end of a bracelet strand. Those skilled in the art are familiar with many connecting members, including bars, and the present invention is not limited to a particular connecting member. As can be seen from figures 4, 5 , 6A , 9A, 9B , and 10 , the movable part 5 is made in the form of a slide, housed in a channel 32 made in the central structure 6. The lateral inner walls of the channel 32 are formed so as to retain and guide the slide so that it can perform a displacement in the longitudinal direction. Preferably, each of the side walls of the channel 32 comprises a groove, arranged to receive side edges present on the slide 5, so as to allow the sliding in the longitudinal direction of the movable part 5.

The movable part 5 is housed in a free end 8 of the central structure 6 to emerge from the end 8. The movable part 5 is arranged on the support structure 6 so as to be able to move longitudinally with respect to the longitudinal direction of the bracelet to adjust the length. When extended, the displacement in the longitudinal direction causes the movable part 5 to emerge more from the end 8 of the central support structure 6, and when shortened, the movable part 5 moves in the opposite direction in longitudinal direction, so as to fit more into the support 6.

The clasp comprises a blocking device designed to block the movement of the movable part 5 in at least one direction of longitudinal movement. This locking device is illustrated in figures 9A, 9B and 9C . In one embodiment, the locking device comprises a notch or a toothing 33, preferably a ratchet toothing, arranged on the movable part 5, a jaw or an opposing tooth 34 connected to an actuating member 9, and a means of return 37, arranged to urge the locking device in the locked position, so as to prevent the movement of the movable part 5 in at least one direction along the longitudinal direction of the bracelet.

In one embodiment, the actuator 9 is a pusher, connected to the jaw 34. The movable part 5 comprises a notch 33, and the jaw 34 is arranged to cooperate with this notch 33 and to block the movement of the movable part 5 in the absence of an actuation of the actuating member 9.

In one embodiment, the locking device further comprises a rod or bar 12 ( figures 9C and 12 ) connecting the jaw or tooth 34 to said actuating member 9. This rod is preferably housed in a housing 36 made in the central support 6, and this housing 36 is arranged so as to position the rod above or below of the movable part 5 in the central support structure 6.

The actuator 9 is preferably connected by the rod or bar 12 to the jaw 34 so as to form a pawl. The notch 33 is arranged on a side face of the slide 5, so as to cooperate with the jaw 34. The actuator 9, the bar and the jaw 34 are preferably formed in one piece 19, housed in housing 36 ( figures 7A and 7B ) provided in the central structure 6. The return means, in particular springs 37 act on the pusher in order to urge the jaw 34 in the direction of the notch, thereby blocking the movement of the slide 5 in the absence of a activation by a user.

It should be noted that the shapes of the notching and of the jaw are such that the displacement in one of the two longitudinal directions is completely blocked by the locking device in the rest position, while the displacement in the other direction may be performed when a force acts on the slide in this other direction. This is accomplished by the asymmetric ("anti-kickback") shape of the teeth of the serration and the jaw. In practice, this configuration allows a user to shorten the bracelet by exerting a force on the strand attached to the movable part 5, by pushing the strand in the direction of the clasp. This force is transmitted to the jaw which, in this case, is forced to disengage from the space between two teeth in which it is located. Accidental or force-acting lengthening of the clasp bracelet is prevented by the orthogonal surfaces on one of the two sides of the teeth and jaw. To lengthen the clasp, it is necessary to activate the locking device by pressing on the pusher 9, which makes it possible to completely disengage the jaw 34 from the toothing of the notching. In the latter case, the slide 5 can be moved in both longitudinal directions along the length of the bracelet, allowing shortening and lengthening. As can be deduced from the figure 9C , the slide 5 is retained in its housing 32 in the structure 6 by a screw 25, which is arranged to abut against the bar 25 when a maximum extension of the strap length has been reached. The stop in the other direction is simply determined by the end of the housing 32 inside the structure 6. The figure 9C shows the slide 5 in its most withdrawn position in the structure 6, abutting against the interior end of the housing.

In another embodiment, shown to figures 13 and 14 , the actuating member 9 comprises or is connected to a pull tab, that is to say a member intended to be pulled to activate the locking device. From what has been described above, it follows that the unlocking of the locking mechanism of the clasp shown in the figures is effected by a movement in the orthogonal direction of the part 19 comprising the pusher 9, the bar 12 and the jaw 34. This same movement can, in principle, be carried out by pulling on the part 19, as described later below with respect to a second embodiment shown in FIGS. figures 13 and 14 . As shown to figures 9A and 9B , the return means 37 are made in the form of two springs 37, housed on the one hand in a pair of recesses present in the pusher 9 and on the other hand in a pair of recesses made in the housing 36 of the part 9, 34, 12. These latter hollows are made on either side of a channel in which the bar 12 is guided. In the case of an actuator comprising a pull tab 141 ( figure 13 ), it is possible to keep a support for the springs like that of pusher 9, because of the little space available to house the springs.

One of the features of the clasp shown in the figures lies in the integration of the locking device, including its actuator 9, in a relatively centered position, along the central axis of the direction of the length of the bracelet. On the other hand, the locking device is centered in the radial / vertical direction, between the first and second blades 1, 2. It will be noted that the upper surface of the central structure 6 is located above the upper surface 21 of the bars. side members 15, 15 '. When the clasp is closed ( figures 1, 2, 3B ), the upper part of the central structure 6 is located between the side members 14, 14 '.

The central support structure 6 is centered with respect to the direction of the strap length so that, when the clasp is closed, the side members 14 '14' of the second blade 2 are located on either side of the structure. central support 6. In one embodiment, said side members 14, 14 'of the second blade 2 are disposed laterally relative to the central support structure 6 when the clasp is closed, preferably so as to at least partially surround the central support structure 6 when the clasp is closed. This external lateral arrangement of the side members 14, 14 'represents a major difference compared to clasps of the type. EP0913106 , in which the flexible side members of the locking mechanism are centered and integrated between uprights of a first blade, the latter forming the frame.

In the case of the clasp according to one embodiment of the invention, the side members 14, 14 'of the locking mechanism 3 comprising the flexible ends linked to a handling member 7, 7' are preferably arranged externally with respect to a structure or blade. central 6, carrying the locking device for the fine length adjustment.

In one embodiment, the actuating member 9 is at least partially arranged in a space 16 formed between the two side rails 14, 14 'of the second blade when the clasp is closed.

In one embodiment, the adjustment device 4 is arranged so that, when the clasp is closed, at least part of the adjustment device 4 extends, in the vertical direction, in a space 16 arranged by the second blade 2. ( figure 6A ).

In the embodiment shown in the figures, this space 16 is provided between the two side members 14, 14 'of the second blade 2.

In one embodiment, the length adjustment device 4 is integrated and / or mounted in the central structure 6 so that the actuator 9 emerges vertically at least partially in the space 16 provided in the second blade. 2.

In one embodiment, the clasp comprises a frame or a yoke 20 arranged at a second end of the second blade 2. Preferably, the frame or the yoke 20 supports the second fixing member, and comprises, on its lower side, a space and / or a recess 17 to allow the movable part 5 to move in the space 17. In one embodiment, when the clasp is closed, the second blade 2 extends beyond the free end 8 of the central support structure 6 so that the frame or the yoke 20 is located in front of the free end 8. In this way, the frame 20 does not obstruct the central support structure 6, but comes to be positioned in front the free end of the central structure 6. On the underside of the frame, the space 17 is provided, for example created by a recess, allowing the movable part 5 to emerge from the end of the central structure 6. The frame and / or the yoke 20 supports preferably at least one handling member 7, 7 '.

According to one embodiment of the invention, the first blade 1 comprises upper lateral surfaces 21 arranged so that, when the clasp is closed, said lateral surfaces 21 and said longitudinal members 14, 14 'are at least partially superimposed.

The integration of the length adjustment device 4 and in particular of the locking device in the central structure 6 makes it possible to reduce the size of the clasp in the radial direction, that is to say, the thickness of the clasp.

In one embodiment, the length adjustment device 4 comprises an actuating member 9 arranged to allow unlocking of the locking mechanism, the actuating member 9 being separate, distinct and / or different from the member. activation 7, 7 '.

In one embodiment, the first fixing member 11 is arranged on a lower face of the movable part 5, so as to face the wrist of a user wearing a wristwatch comprising the clasp. It will be noted that the tenons 11 of the fastener for the bracelet strand are oriented downwards, that is to say they point from the slide 5 towards the wrist of the user. This also saves space and makes the clasp more compact. When the clasp is closed, the two fasteners 11, 12 are located one above the other in the radial / vertical direction ( figure 3B ). In one embodiment, the first fastener 11 is arranged such that the free end of the bracelet (not shown) is attached below a lower general surface 44 of the first blade ( figure 2 ).

In one embodiment, the movable part 5 is disposed at least partially below the second blade 2.

As can be seen at the figure 3B , the frame or the yoke 20 is disposed above the first fixing member 11 when the clasp is closed. Similarly, the second fixing member, which is supported by the frame or the yoke 20 is disposed above the first fixing member 11 when the clasp is closed.

In one embodiment, the activation of at least one handling member 7 of the locking mechanism 3 causes the movement of a part 19 of the locking device and causes the unlocking of the adjustment device 4 and / or of the locking device. blocking. Preferably, the activation of one handling member 7 causes the movement of a side member 14 which, during this movement, acts on a part 19 of the fine adjustment mechanism and causes the release of the latter, thus making it possible to adjust the length.

In one embodiment, the locking mechanism 3 and the length adjustment device 4 are arranged so that the activation of the manipulation member 7, 7 'by a user induces the unlocking of the locking device 25 only. when the clasp is closed.

In one embodiment, the actuating member 9 is directly accessible or can be activated by a user only when the clasp is open and / or when said first and second blades 1, 2 are unfolded. In the embodiment shown, the actuator 9 is not accessible directly from the outside of the clasp when the clasp is closed. In order to be able to press directly on the pusher 9, the user opens the clasp, in order to be able to press the pusher. This is the result of integrating the adjustment device centrally. However, the clasp is designed so that the length adjustment (in both directions along the longitudinal direction) can also be performed when the clasp is closed. According to one embodiment, the adjustment device 4 and in particular the actuator 9 can be activated indirectly, preferably when the clasp is closed.

In one embodiment, the locking mechanism 3 comprises at least one handling member 7 arranged to be activated by a user to unlock the locking mechanism 3 in order to allow the opening of the clasp 10. Preferably, the locking mechanism 3 is arranged so that the activation of at least one of the two handling members 7, 7 'generates the unlocking of the locking device 19, 33, 34, 37.

As can be seen in the figures 1, 2 , 4 and 5 , for example, the pusher 9 protrudes relative to a side surface of the central support structure 6. The pusher 9 thus faces the spar 14, more precisely to an inner side surface of the spar 14, when the clasp is closed. As mentioned below, this spar 14 moves in a direction orthogonal to the direction of the length of the bracelet when the locking mechanism 3 is activated. The figures 11A, 11B , and 11C , show that, when a user presses the pushers 7, 7 'of the locking mechanism 3, the movement of the spar 14 causes pressure on the handling member 9, causing the adjustment device to be released. In these figures, the spar 14 ', which does not cooperate with the length adjustment device when the clasp is closed, has been omitted. The arrow shown in black in the figures 11A and 11C indicates the contact between the side member 14 and the pusher 9 when the device 7 is activated.

In one embodiment, said side members 14, 14 'are arranged relative to said handling member 7, 7' so as to move when the handling member 7, 7 'is activated by a user. Preferably, the movement of at least one of the side members 14 causes unlocking of the locking mechanism 3.

In one embodiment, the spar 14 is caused to move in a direction orthogonal to the longitudinal direction of the bracelet when the handling member 7 is activated. During this movement of the spar 14 in the orthogonal direction, the spar 14 acts on the actuator 9 of the length adjustment device 4, in order to unlock the locking mechanism 2.

In one embodiment, the activation of the handling member 7, 7 'by a user makes it possible both to unlock the locking mechanism 3 and to unlock the locking device.

It should be noted that the pressure exerted on the pushers 7, 7 'causes the unlocking of the locking mechanism 3, but not necessarily the opening of the clasp. To open the clasp, it is in fact necessary not only to unlock the locking mechanism 3, but also to actively lift the second blade 2 in order to deploy the blades of the clasp. When a user presses the pushers 7, 7 'without deploying the blades, the clasp remains closed and a length adjustment can be made. When the length adjustment is completed, the user can release the pressure on the push-button (s) 7, 7 'and the locking mechanism 3 again goes into the locked position (rest position), without the clasp having been open.

In the embodiment shown, only the spar 14 and not the opposite spar 14 'is arranged to be able to act on the actuating member 9, due to the asymmetry of the length adjustment device. Consequently, according to a preferred embodiment, it suffices to activate one of the two manipulation members. A user can hold the clasp between the thumb and forefinger so as to press only the pusher 7, for example, and in this way unlock the locking device without completely unlocking the locking mechanism 4.

In one embodiment, the handling member 7 is arranged to be able to act either directly or by a mechanism or an intermediate structure 14 on the actuating member 9 when the clasp is closed. In the embodiment shown, this mechanism or this intermediate structure corresponds to the spar 14 of the second blade 2. In the embodiment shown in the figures, each spar is secured to one of the two handling members, for example formed by a part with one of the two manipulators. In one embodiment, one of the side members 14 is not formed in one piece with the handling member 7, 7 ', but both are made in two or more pieces, which may or may not be integral with the one from the other. The two parts can be in direct contact or can cooperate by means of a mechanism and / or by one or more separate parts. In all these cases, it is preferred that the activation of the handling members 7, 7 'results in movement of the side members, preferably in an orthogonal direction.

From the above, it becomes clear that the clasp of the invention allows length adjustment when the clasp is open and also when the clasp is closed. Preferably, the locking device can be activated whether the clasp is open or closed. When the clasp is open, the user can press directly on the actuating member 9. When the clasp is closed, the activation of the length adjustment device is effected by means of the first handling member 7.

The first blade 1 is shown separately at figure 10 . In the embodiment shown, the blade 1 comprises two parts, for example two semi-blades or two partial blades, a frame blade 30, shown in figure 8 , and the central blade 35, shown in figures 7A and 7B .

In one embodiment, the first blade 1 comprises two distinct parts 30, 35, made integral with one another, a first part 35 comprising the central support structure 6 and a second part 30 comprising two side rails 15, 15 ', between which the central support structure 6 is framed and / or attached.

According to a preferred embodiment, during the assembly of the two partial blades 30, 35, this assembly becomes non-removable. The two partial blades are thus rigidly connected so as to behave as a single part.

The blade frame 30 ( figure 8 ) comprises the two lateral spars 15, 15 ', essentially parallel, a transverse upright 43 rigidly connecting the spars, and, at the second end, a frame 18 comprising two lateral extensions 28 of the spars 15, 15' and a transverse plate 29. The frame 18 forms an opening in the first blade 1, making it possible to thread and frame the end of the bracelet strand which will be attached to the first fixing member 11. When the clasp is connected to the bracelet strands, the strand of bracelet connected to the first fixing member 11 will pass over the transverse plate 29 and will be located below the blades of the clasp, in contact with the user's wrist.

As shown in figure 8 , recesses or housings 38 are made in the inner faces of the side members 15, 15 ', intended to accommodate protuberances 39 arranged on the central blade 35, in order to form a retaining or attachment structure to allow the two blades to be connected. partial 30 and 35. Instead of protuberances and recesses, any other connection or interaction structure can be provided to allow hooking between the two partial blades.

The central blade 35 ( figures 7A and 7B ) comprises the central support structure 6, carrying the length adjustment device 4. The recesses forming the channel 32 and the housing 36 are created in the central blade 35. The latter further comprises two side fins 41, intended to be in contact with the side members 15, 15 'when the two partial blades 30, 35 are assembled, and forming a common upper surface 21. A transverse recess 42 is made in the underside of the central blade 35 ( figure 7B ), to release a space in which the transverse upright 43 of the frame blade 30 comes to rest when the two partial blades are assembled ( figure 6A ). Towards its first end, the central blade 35 also has a transverse hole to allow articulation with respect to the second blade and to help assembly between the partial blades 30, 35.

In general, the parts of the clasp of the invention can be made, independently, from any suitable material. Typically, the clasps and / or their parts are made of metal. For example, the blades and the functional parts are typically made of metal, for example steel, stainless steel, titanium, gold, silver, or any other metal or metal alloy. In one embodiment of the invention, the first blade 1, the first part or the partial blade 35, and / or the part carrying the length adjustment device 4 may comprise a non-metallic material. For example, the first blade or the first part 1 of the first blade is made of a material including a non-metallic material.

In one embodiment, the material comprising a non-metallic material is chosen from among the following: a material other than metal, a composite material, a plastic (polymer) and / or carbon fiber. Preferably, the blade or part in question is made of a material comprising carbon fiber and, optionally, plastic.

In one embodiment, the first blade 1, the first part 35, the first partial blade 35, and / or the blade carrying the length adjustment device is manufactured by injection and / or by injection molding. This applies to a part made of a material including a non-metallic material.

The fact of making a blade or part of it by molding provides several advantages. On the one hand, when the part comprises a material other than metallic materials, the weight of the part, compared to a metal part, is reduced. On the other hand, the manufacturing costs are significantly lower. In one embodiment, the assembly of the first blade 1 is made of the same material other than metal, for example one of the aforementioned materials, preferably a plastic material comprising carbon fiber.

In one embodiment, the clasp of the invention comprises a length adjustment device 4 housed in the part 35 or the blade 1 comprising the non-metallic material.

In one embodiment, the part 35 or the blade 1 comprising the (or manufactured in) non-metallic material has one or more recesses 32, 36 intended to accommodate one or more parts 5, 9, 34 which form part of the length adjustment device 4. Said parts 5, 9, 34 which form part of the length adjustment device. length 4 are chosen from the movable part 5, a part 9, 12, 34 comprising a jaw or a tooth 34, intended to cooperate with the mobile 5, and an actuator 9 arranged to allow the unlocking of the mobile part 5 In a preferred embodiment, one or more of the parts 5, 9, 12, 34 of the length adjuster 4 are made of metal.

In one embodiment, the clasp has parts made of a material including a non-metallic material and other parts made of metal. For example, the first blade may comprise a first partial blade 35 made of a material comprising a non-metallic material, and a second partial blade or frame blade 30 made of metal. In one embodiment, a complete blade 1 is made of a material having non-metallic components, and another blade 2 is made of metal. A blade or partial blade made of a material comprising a non-metallic material can accommodate and / or cooperate with metal parts. On the other hand, the invention also covers the possibility that two, more or all of the blades of the clasp are made of a material comprising a non-metallic material, and the parts housed in these blades may be metallic or comprise non-metallic materials. , for example.

A material comprising the non-metallic material may be made entirely of a non-metallic material, for example plastic and / or carbon fiber, or may comprise a mixture of one or more metals and one or more non-metallic materials. .

The figure 13 shows a clasp 100 according to a second embodiment. The clasp 100 comprises a first blade 101 comprising a central structure 106, the first blade being articulated to a second blade 102 comprising two lateral longitudinal members 114, 114 'at a first end of the blades. The movable part, which emerges at the free end of the structure 106, is not visible, but the handling member 109 is disposed projecting in a lateral side of the structure 106 (shown on the left side of the structure 106 to the figure 13 ). The two side members 114, 114 'are arranged laterally with respect to the central structure 106 of the first blade 101.

A peculiarity of the clasp of the figure 13 is that the side members 114, 114 'are connected to pushers 107, 107', respectively, arranged at the lateral sides opposite with respect to the lateral side of the respective side member. The spar 114 is preferably connected to the handling member 107, and the spar 114 'to the member 107'. The two parts or entities comprising the side members 114, 114 'and the members 107, 107' cross, preferably at the second end of the side members. A spar and the member to which it is connected can form an element reminiscent of the letter L. This element can be formed in a single piece or in several pieces made integral with one another. Due to the crossing of these elements, a pressure exerted by a carrier by pushing the members 107, 107 'causes a spacing of the side members 114, 114'. This spacing unlocks the locking mechanism. In the case of the clasp shown in figure 13 , the hooking members or complementary stop forms 22, 23 are arranged on the central structure 106 on the one hand and the side members 114, 114 ', on the other hand. These fasteners are not visible to the figure 13 , but their operation is exactly the same in that the movement of the side members 114, 114 'generates a separation of the complementary hooking members, which allows a separation of the first and second blades 101, 102 by pivoting, and thus the opening of the clasp.

Arranging the complementary hooking members 22, 23 on the outer sides of the central structure 106 and on the inner sides of each of the side members 114, 114 'can be advantageous. The extensions 28 or the structures in elevation 31 of the embodiment shown in figure 1-11 are no longer necessary to arrange the complementary members on the side of the first blade 1. In fact, in the clasp shown in figure 13 , it is possible to omit the partial strip 30 and / or its structural elements described above ( figure 8 ). For example, a first blade comprising or consisting essentially of the central support structure 106 could be sufficient.

Due to the spacing of the side members when the members 107, 107 'are pushed in, the activation of the locking mechanism does not generate pressure on the actuator 109. As can be seen in figure 14 , the part 119 comprising the pusher 109, the transverse bar 112, the jaw or the opposing tooth 134 also comprises an extension 140, extending the bar 112 in an orthogonal direction. The extension 140 emerges from the lateral flank opposite that of the pusher 109 on the central structure 106 (not visible). A pin 141, arranged on the extension 140 functions as a pull tab or member hooking, making it possible to perform a tensile force on the part 119. For this purpose, a hole 144 is made in the spar 114 ', arranged to receive the pin 141 when the second blade 102 is folded over the first blade 101 When the clasp is in the closed position, the spar 114 is connected to the pull tab 141 so that the actuation of the member 107 ′ pulls on the pull tab, allowing the unlocking device to be released when the release device is activated. the actuator. Of course, it is always preferred that the return means are arranged to keep the locking device in the locked position. These return means can be arranged between the pusher 109 and the structure 106, as shown in figures 9A and 9B .

From the above it follows that a second actuator 141 may be present instead of pusher 109 or may exist in addition to pusher 109. The presence of an actuator in the form of a pull tab 141 is particularly preferred when the locking mechanism described above is based on a spacing instead of bringing together the side members of the second blade 102. In this case, the invention contemplates connection means, for example a pair of hooks or a hook. connection by a pin and a hole, arranged so that during the separation of at least one of the two side members 114, 114 ', a traction is effected on the part 119, allowing the unlocking of the unlocking device during the activation of the actuator. It should also be specified that the element 119 can be made in several separate parts, preferably made integral. In one embodiment, the locking device comprises both a pusher 109 and a pull tab 141. Preferably, the activation of each of the two allows unlocking of the locking device. The pusher can preferably be actuated by a wearer who has opened the clasp, for example by pressing with a finger on the pusher, while the pull tab is preferably activated indirectly, by the movement of at least one spar during activation. of the locking mechanism.

The figures 15 and 16 show a clasp 200 according to a third embodiment. A first blade 201 is hinged to a second blade 202 at a first end of the blades. The first blade 201 comprises a central support structure 206. In the free end of this structure (the second end of the first blade), a movable part 205 is housed, arranged so as to the end of the structure 106. The structure 206 contains recesses or hollows similar to those described above, making it possible to house the movable part 205 and the part 219 comprising the actuating member 209. A first fixing member 211, produced in the form of a transverse bar, is connected to the movable part 205. The second blade 202 comprises two side rails 214, 214 ', articulated to the first end and stabilized towards the second end by a transverse tube not shown. A difference of the clasp 200 from the previous clasps is that the actuator 209 emerges on the right side of the central structure 206, as shown in FIGS. figures 15 and 16 . In previous clasps, the locking device had an opposite orientation.

The side members 214, 214 'are arranged laterally with respect to the structure 206 when the clasp is closed. Each spar is connected to a respective handling member, 207, 207 'by an orthogonally oriented rod 247 having a diameter which is reduced with respect to the diameter of the members 207, 207. The clasp 200 comprises a U-shaped loop 220, of which the two free ends have holes in which the rods 247 are threaded. The loop 220 can pivot around the axis defined by the rods 247, while stabilizing the ends of the side members 214, 214 '. A second fastener, not shown, is connected to loop 220.

As in the clasp shown to figures 1-12 , the activation of the handling members 207, 207 ', by pressure causes the side members 214, 214' to come together. One of the two side members, the side member 214 ′ is arranged to act on the actuating member 209 and unlock the locking mechanism, during its movement, according to the same principle described above. As can be seen better at the figure 15 , the first blade 214 comprises, on its underside, side plates or fins 215, on which the side members 214, 214 'come to rest when the clasp is closed. Each of the plates 215 has an edge or an elevation structure 231 for containing the respective spar. On the inner face of the edge 231 is a hooking member, arranged to cooperate with a complementary member arranged on the outer blank of the respective spar. Together, the pair of hooking members lock the clasp in the closed position, when the two blades are folded towards each other, as described with respect to the embodiment shown in FIGS. figures 1-12 . The simultaneous activation of the two pushers 207, 207 'by pressure causes the side members to come together and the separation of the complementary fastening members, making it possible to unfold the blades 201, 202 to open the clasp.

Those skilled in the art will understand that an embodiment resides in the arrangement of the length adjustment device on a support structure of a first blade and in the possibility of activating the adjustment device by a locking mechanism based on side members of a second blade, the ends of which can move in s' spreading or approaching preferably along an orthogonal axis or in an orthogonal plane. In the embodiments where the side members come closer during unlocking, at least one of them preferably acts on a pusher. In the embodiments where the side members move apart during unlocking, at least one of them preferably acts on a pull tab. As mentioned, there may also be a pull tab as well as a pusher, the latter preferably being activated by the user directly, when the clasp is open.

Those skilled in the art will not encounter any particular difficulty in adapting the content of the present disclosure to their own needs and implementing a clasp, in particular for a timepiece, without departing from the scope of the present invention. For example, those skilled in the art could envisage a locking mechanism different from that shown in the figures, while arranging the latter so that activation of a handling member causes the unlocking of the locking device. More generally, the length adjustment device according to the invention can be adapted to other types of clasps, in particular for wristwatches.

Claims (15)

1. Folding clasp (10) for a bracelet, comprising:

   - a first blade (1) and at least a second blade (2), articulated with respect to each other, the second blade (2) comprising two lateral beams (14, 14');

   - a first fixing member (11) connected to the first blade (1) and destined to be connected to a first free end of the bracelet;

   - a second fixing member destined to be connected to a second free end of the bracelet;

   - a locking mechanism (3) arranged to hold said first and second blades (1, 2) in the closed position of the clasp when said first and second blades (1, 2) are brought together and folded over one another,

   - a central support structure (6) connected to said first blade (1) or forming a single piece with said first blade (1);

   - a device for adjusting the length (4) of the bracelet, integrated and/or mounted in said central structure (6), the adjustment device (4) comprising:

   - a mobile part (5) to which said first fixing member (11) is attached, said mobile part (5) being arranged on said support structure (6) so as to be able to move longitudinally in relation to the bracelet in order to perform a length adjustment;

   - a blocking device (33, 34, 37) arranged to block the movement of the mobile part (5) in at least one longitudinal movement direction;

   - an actuating member (9) arranged to allow the unblocking of the blocking device and the movement of the mobile part (5) and thus the length adjustment;

   - wherein said mobile part (5) is housed inside a free end (8) of said central structure (6) so as to be able to emerge from said end (8) or be inserted into said end (8) during said longitudinal movement;

   the clasp being characterized in that said lateral beams (14, 14') of said second blade (2) are arranged laterally with respect to said central support structure (6) when the clasp is closed.
2. Clasp according to claim 1, characterized in that said lateral beams frame said central support structure (6) at least partially when the clasp is closed.
3. Clasp according to any of the preceding claims, characterized in that said adjustment device (4) is arranged so that, when the clasp is closed, at least one part of said adjustment device (4) extends, in a vertical direction, in a space (16) formed by said second blade (2).
4. Clasp according to claim 3, characterized in that said space (16) is formed between the two lateral beams (14, 14') of the second blade (2).
5. Clasp (10) according to any of the preceding claims comprising a frame or a cap (20) arranged at a second end of the second blade (2), characterized in that said frame (20) comprises, on its lower side, a space and/or a recess (17) in order to allow said mobile part (5) to move inside said space (17).
6. Clasp (10) according to any of the preceding claims comprising a frame or a cap (20) arranged at a second end of the second blade (2), characterized in that, when the clasp is closed, said second blade (2) extends beyond said free end (8) of the central support structure (6) so that said frame or said cap (20) is positioned in front of said free end (8).
7. Clasp (10) according to any of the preceding claims, characterized in that the locking mechanism (3) comprises at least one handling member (7, 7') arranged to be activated by a user to unlock the locking mechanism (3) in order to allow the clasp (10) to be opened, and in that said locking mechanism (3) is arranged in such a way that the activation of at least one of said handling members (7) causes the unblocking of the blocking device (33, 34, 35).
8. Clasp according to claim 7, characterized in that the activation of at least one handling member (7) causes the movement of a lateral beam (14), and in that this movement acts on a part (19) of the blocking device (9, 33, 34, 37) and causes the unblocking of the adjustment device (4) and/or of the blocking device.
9. Clasp (10) according to any of the preceding claims, characterized in that said first fixing member (11) is arranged on a lower face of the mobile part (5), so as to face the wrist of a user wearing a bracelet comprising the clasp (10).
10. Clasp (10) according to any of the preceding claims, characterized in that said first blade (1) comprises two separate parts, connected to each other (30, 25), a first part (35) comprising said central support structure (6) and a second part (30) comprising two lateral beams (15, 15), between which said central support structure (6) is framed and/or attached.
11. Clasp (10) according to any of the preceding claims, comprising a blade (1) or a part (35) of a blade (1) made of a material comprising a non-metallic material, made by injection moulding.
12. Clasp according to claim 1, wherein the central support structure (6) is centered in relation to the direction of the bracelet length so that, when the clasp is closed, the beams (14, 14') of the second blade (2) are positioned on either side of the central support structure (6).
13. Clasp according to claim 1, wherein said beams (14, 14') of the second blade are placed at least partially above the beams (15, 15') of the first blade (1) when the clasp is closed.
14. Clasp according to claim 1, characterized in that the first blade (1) comprises upper lateral surfaces (21) arranged in such a way that, when the clasp is closed, said lateral surfaces (21) and said beams (14, 14') of the second blade (2) are at least partially superimposed.
15. Clasp (10) according to any of the preceding claims, characterized in that the upper surface of the central structure (6) is raised relative to the upper surface (21) of the beams (15, 15') of the first blade (1).

Images