Watch strap clasp comprising a device for adjusting the length of said strap.

Abstract

The invention relates to a watch strap clasp comprising: - a closing clip (1) formed of articulated strips (10, 11) and a cover (12) which overlap when said clip is in a closed position, - a device for adjusting the length of the strap installed in the cover (12), the adjustment device comprising: - a slider (4) confined in the cover (12) and having a guide slot (40) extending in an adjustment direction (XX), positioning notches (43) being arranged in said slot, - a support (5) carrying at least one lug (50) passing through the slot (40) and configured to engage in the notches, said lug and said slot being mounted to slide relative to each other, said lug having an upper end and a lower end defining a longitudinal axis (ZZ) normal to the guide direction (XX), - at least one elastic constraint member (7) cooperating with the support (5),- an actuable button (6) arranged in the cover (12), which button has a face in contact with the upper end of the cleat, and in which: - the actuation of the button (6) pushes back the cleat (50) which translates along its longitudinal axis (ZZ), until reaching a position where it is released from the notches so that the slider can slide relative to said cleat until reaching a desired adjustment position, - when the button is released, the elastic member (7) constrains the support (5) to bring back the cleat (50) which translates along its longitudinal axis (ZZ), until reaching a position where it locks in a notch (43) and blocks the slider (4) in position. [Fig. 7A],

Description

Title of the invention: Watch strap clasp comprising a device for adjusting the length of said strap. Technical field

[0001] The invention relates to a watch strap clasp comprising a device for adjusting the length of said strap. The invention also relates to a strap and a watch equipped with such a clasp.

[0002] The invention relates to the general technical field of watchmaking and more particularly to closures for watch straps comprising means for adjusting the length of said strap. State of the art

[0003] A watch is generally composed of the following elements: a case housing the watch mechanism (including the dial and hands); a strap surrounding the user's wrist; and a closing clip for securing the strap around the wrist.

[0004] Adjusting the length of the bracelet is particularly useful for bracelets comprising bracelet segments composed of articulated links (metal or plastic). For this type of bracelet, the length adjustment is generally achieved by adjusting the number of links to the size of the user's wrist. However, this technique does not allow for precise adjustment of the bracelet length.

[0005] Some closure clips include an adjustment device allowing finer adjustment of the length of the bracelet to the size of the wrist. Such an adjustment device is for example described in patent document JP2582413Y2. This type of adjustment device is however relatively complex to produce and requires a large number of parts to operate. This results in significant operational costs and times associated with the phases of assembly, maintenance, replacement or repair of the adjustment device. In addition, the size of these adjustment devices is generally significant so that the closure system is not very aesthetic.

[0006] The invention aims to overcome all or part of the aforementioned drawbacks. The invention aims in particular to achieve all or part of the following objectives: simplify the design of the adjustment device; reduce the number of parts necessary for the operation of the adjustment device; guarantee precise adjustment of the length of the bracelet; design an adjustment device which is simple and quick to handle; reduce the operational costs and times associated with the assembly and maintenance phases, replacement or repair of the adjustment device; design an adjustment device that is compact and preserves the aesthetics of the closure system. Presentation of the invention

[0007] The solution proposed by the invention is a watch strap clasp comprising: - a closing clip formed of articulated slats and a cover which overlap when said clip is in a closed position, - a device for adjusting the length of the strap installed in the cover, the adjustment device comprising: - a slide confined in the cover and having a guide slot extending in an adjustment direction, positioning notches being arranged in said slot, - a support carrying at least one cleat passing through the slot and configured to engage in the notches, said cleat and said slot being mounted to slide relative to each other, said cleat having an upper end and a lower end defining a longitudinal axis normal to the guiding direction, - at least one elastic constraint member cooperating with the support, - an actuable button arranged in the cover, which button has a face in contact with the upper end of the cleat, and in which: - the actuation of the button pushes the cleat which translates along its longitudinal axis, until reaching a position where it is released from the notches so that the slider can slide relative to said cleat until reaching a desired adjustment position, - when the button is released, the elastic member forces the support to bring back the cleat which translates along its longitudinal axis, until reaching a position where it locks in a notch and blocks the slide in position.

[0008] The design of this adjustment device is simplified in comparison with the adjustment devices of the aforementioned prior art. The number of parts ensuring its operation is notably reduced, which facilitates not only the initial assembly, but also the maintenance, replacement or repair phases, the risks of mechanical failures being further limited. This reduction in the number of parts is notably ensured by the triple function of the cleat which serves both as a stop member pushing back the support, as a guide member for the slide, and as a locking member for said slide.

[0009] Furthermore, this original design makes it possible to reduce the compactness of the adjustment device so that it can be very simply integrated into the clip cover, preserving the aesthetics of the bracelet closure system.

[0010] Furthermore, the use of an operable button to control the cleat and an elastic member ensuring that said cleat automatically returns to a locking position when said button is released, allows for rapid and intuitive adjustment of the length of the bracelet.

[0011] Thus, the device which is the subject of the invention effectively meets all the stated objectives, offering a solution which is at once practical, economical and aesthetic for adjusting the length of a watch strap.

[0012] Other advantageous features of the invention are listed below. Each of these features may be considered alone or in combination with the remarkable features defined above. Each of these features contributes, where appropriate, to the resolution of specific technical problems defined further in the description and in which the other features defined above do not necessarily contribute. The following features may thus be the subject, where appropriate, of one or more divisional patent applications:

[0013] According to one embodiment, the slider is mounted to move in a first slide arranged inside the cover, which first slide extends in the adjustment direction.

[0014] According to one embodiment, the support is mounted to move in translation in a second slide arranged inside the cover, which second slide extends in the height of said cover, in a direction perpendicular to the adjustment direction.

[0015] According to one embodiment, the support has two ends, each end comprising a hole receiving a guide axis for guiding the translation of said support in the second slide.

[0016] According to one embodiment: - the second slide has two housings in which the ends of the support are inserted; - an elastic constraint member is installed in each of said housings; - each said constraint member is in the form of a helical comprehension spring installed around the corresponding guide axis and bearing on one side on a closing plate of the corresponding housing and on the other side on the support.

[0017] According to one embodiment, one of the slats is made up of two parts mounted to slide relative to each other, so that said slat has a telescopic deployment capacity.

[0018] According to one embodiment, the clasp further comprises a closing device for holding the closing clip in the closed position, which closing device closure comprises: - a lock held in the advanced locking position by a spring; - an actuating member connected to the lock and having sliding rollers; - pressure buttons, the ends of which are in contact with the rollers so that by pressing said buttons, said ends press against said rollers so as to push the actuating member, pulling the lock with it to a retracted unlocking position.

[0019] Another aspect of the invention relates to an adjustable watch strap comprising: - a first segment and a second segment, which segments are composed of articulated links; - a clasp conforming to one of the preceding characteristics and in which one end of the first segment is connected to one of the strips, one end of the second segment is connected to the slider.

[0020] Yet another aspect of the invention relates to a watch comprising an adjustable bracelet conforming to the preceding characteristics. Brief description of the figures

[0021] Other advantages and characteristics of the invention will appear more clearly on reading the description of the embodiments which follow, with reference to the appended drawings, produced as indicative and non-limiting examples and in which: [Fig.l] is a view of a clasp according to the invention in a closed position. [Fig.2A] is a top view of the cover of a closing clip according to the invention. [Fig.2B] is a bottom view of the cover of [Fig.2A]. [Fig.3A] is a top view of a movable plate of an adjustment device according to the invention. [Fig.3B] is a bottom view of the plate of [Fig.3A]. [Fig.4A] is a view of a cleat support of an adjustment device according to the invention. [Fig.4B] is a view of a cleat support according to an alternative embodiment. [Fig.5A] is a top view of a button of an adjustment device according to the invention. [Fig.5B] is a bottom view of the button of [Fig.5A]. [Fig. 6A] is a cross-sectional view of a clasp according to the invention, the button being released. [Fig. 6B] is a cross-sectional view of a clasp according to the invention, the button being actuated. [Fig.7A] is a longitudinal sectional view of a clasp according to the invention, the button being released. [Fig.7B] is a longitudinal sectional view of a clasp according to the invention, the button being actuated. [Fig.8A] illustrates a closing device. [Fig.8B] shows the closing device in the locking position. [Fig.8C] shows a slat configured to receive the closure device. [Fig.9A] shows the arrangement of constituent elements of the closing device, said device not being actuated. [Fig.9B] shows the arrangement of constituent elements of the closing device, said device being actuated. [Fig. 10A] is a top view of a clasp according to the invention in an open position and the slats of which are in a first deployed position. [Fig.lOB] is a side view of the clasp of [Fig.lOA]. [Fig.l IA] is a top view of the clasp of [Fig.lOA] with the slats in a second deployed position. [Fig.llB] is a side view of the clasp of [Fig.l]lA. Weighing the option of embodiments

[0022] For the sake of clarity, the following clarifications are made to certain terms used in the description and the claims: - “X and / or Y” means: X alone or Y alone or X+Y. - Unless otherwise stated, the use of the ordinal adjectives "first", "second", etc., to describe an item merely indicates that different occurrences of similar items are being referred to and does not imply that the items so described must be in any given sequence, whether in time, space, ranking, etc. - Generally speaking, it will be appreciated that on the various attached drawings, the objects are arbitrarily drawn to facilitate their reading.

[0023] Referring to [Fig.l], the clasp comprises a closing clip 1 formed in a conventional manner of articulated strips 10, 11 and a cover 12 which overlap when said clip is in a closed position. The strips 10, 11 are articulated at one of their respective ends 100, 110. They are generally in the form of flat and rigid metal parts.

[0024] The clasp according to the invention can be fitted to any type of watch strap, but is particularly suitable for straps comprising two segments 2, 3 composed of articulated links 20, 30 (for example made of metal or plastic material). In [Fig. 1], one end of a first segment 2 is connected to a first strip 10 and one end of a second segment 3 is connected at the cover 12 as explained further in the description. The first strip 10 has, for example, a hole 102 adapted to receive a pin (not shown) ensuring the connection between the end of the first segment 2 and said strip. Conventionally, the other respective end of each segment 2, 3 is connected to the watch case (not shown).

[0025] In the cover 12 is installed a device for adjusting the length of the bracelet. This adjustment device comprises a slider 4 confined in the cover 12, a support 5 carrying at least one cleat 50, and an actuable button 6 arranged in said cover.

[0026] In Figures 2A and 2B, the cover 12 is of substantially parallelepipedal shape, but other shapes can be envisaged (cylindrical, cubic, polyhedral, etc.). For example, its length is between 1 cm and 4 cm, its width between 1 cm and 3 cm, and its height between 0.5 cm and 1 cm. The cover 12 can be made of steel, plastic material, or any other material suitable to those skilled in the art.

[0027] The cover 12 has, at its upper face, a central recess 120 configured to receive the button 6. This recess 120 is here of circular shape, but other shapes can be envisaged (rectangular, square, oval, polygonal, etc.). Its diameter is for example between 0.5 cm and 2 cm. This recess 120 opens into a housing 126 made on the internal wall of the upper face of the cover 12.

[0028] According to an embodiment illustrated in [Fig.2B], a first slide 121 is arranged inside the cover 12, which slide is adapted to receive the slider 4. The latter is thus free to slide in the first slide 121.

[0029] This first slide 121 is advantageously shaped directly in the side walls of the cover 12, to avoid having to use additional added parts and to gain compactness. The first slide 121 extends in a direction of adjustment of the watch strap. In Figures 2A and 2B, this adjustment direction corresponds to the longitudinal axis XX of the cover 12 and generally corresponds to the longitudinal direction of the strap. The first slide 121 has the main function of blocking the lateral movements (along axis YY) and transverse movements (along axis ZZ) of the slider 4, the latter being able to move only in the direction of movement XX, so that the adjustment is more precise and more stable. The first slide 121 also makes the adjustment device more robust, in particular when the clasp is subjected to untimely external stresses such as shocks or vibrations.The first slide 121 also facilitates the assembly of the slide 4 as well as maintenance or replacement operations. This first slide is however not necessary for the operation of the adjustment device, but contributes to improving it.

[0030] According to an embodiment illustrated in [Fig.2B], a second slide 122 is arranged inside the cover 12, which slide is adapted to receive the support 5. The latter is thus free to slide in the second slide 122. For the same reasons as those mentioned previously, this second slide 122 is advantageously shaped directly in the side walls of the cover 12. The second slide 122 extends in the height of the cover 12, in a direction ZZ (height or depth axis) perpendicular to the adjustment direction XX of the cover 12. In addition to the fact that it facilitates the assembly, maintenance and / or replacement of the support 5, the second slide 122 has the main function of blocking the lateral and longitudinal movements of said support, the latter being able to move only in the height of the cover 12 along the ZZ axis, so that the adjustment device is more stable and more robust.This second slide is not necessary for the operation of the adjustment device, but helps to improve it.

[0031] In Figures 3A and 3B, the slider 4 is in the form of a flat plate, of generally rectangular shape. For example, its length is between 0.7 cm and 2.7 cm, its width is between 0.7 cm and 2.7 cm, and its thickness is between 0.1 cm and 0.7 cm. The slider 4 can be made of steel, plastic material, or any other material suitable to those skilled in the art. When it is inserted into the clasp, the slider 4 remains confined in the cover 12, that is to say it does not protrude from the latter and is not visible.

[0032] The slider 4 has a guide slot 40 extending in the adjustment direction XX. This slot 40 is a through slot, that is to say that it opens at the level of the upper face 41 and lower face 42 of the plate 4. According to one embodiment, the slot 40 is in the form of an oblong hole. As another example, its length is between 0.5 cm and 2.5 cm and its width is between 0.1 cm and 2.5 cm.

[0033] The slider 4 also comprises positioning notches 43 arranged in the slot 40, advantageously at the level of the lower face 42 of the slider 4. These notches 43 are adjacent and aligned along the slot 40. In [Fig.3B], the notches 43 are four in number, but a smaller number (for example two) or a larger number (for example ten) may be provided depending on the desired adjustment capacity. Each notch 43 corresponds to an adjustment position.

[0034] To simplify the design, the notches 43 are advantageously in the form of adjacent counterbores, the shape of which is adapted to receive the active portion of the cleat 50 described further in the description. The notches 43 are not necessarily circular in shape, but may be rectangular, square, oval, polygonal, etc. For example, the diameter of the notches 43 is between 0.7 cm and 1 cm, their center being spaced at least this length apart.

[0035] According to a preferred embodiment, the spacing between two adjacent notches 43 (i.e. the spacing between their centers) is less than the length of a link 20, 30. Thus, a first “rough” adjustment of the length of the bracelet can be carried out by adjusting the number of links 20, 30. And a more “fine” adjustment is carried out thanks to the position of the cleat 50 in the notches 43, as explained further in the description.

[0036] The slider 4 also comprises at one of these edges a means for attaching the end of the second segment 3 of the bracelet. This attachment means is for example in the form of connection tabs 44 each having a hole 440, which holes are adapted to receive a pin (not shown) ensuring the connection between the end of the second segment 3 and said tabs.

[0037] Referring to Figures 4A and 4B, the support 5 has a generally parallelepiped shape. For example, its length is between 0.5 cm and 2.7 cm, its width is between 0.5 cm and 1 cm, and its height is between 0.5 cm and 1 cm. The support 5 can be made of steel, plastic material, or any other material suitable to those skilled in the art. When it is positioned in the cover 12, the longitudinal axis YY of the support 5 is perpendicular to the aforementioned axes XX and ZZ.

[0038] The support 5 comprises at least one cleat 50 which projects in the aforementioned direction ZZ. More particularly, the cleat 50 has an upper end 500 and a lower end 501, which end defines a longitudinal axis ZZ normal to the guide direction XX. In [Fig.4A], the cleat 50 is of generally cylindrical shape, and in [Fig.4B] of generally parallelepipedal shape. The cleat 50 has for example a height of between 0.15 cm and 1 cm and a diameter (or width) adjusted to the width of the slot 40, that is to say of between 0.1 cm and 2.5 cm. The cleat 50 can be attached to the support 5 or be directly shaped therein.

[0039] The cleat 50 is configured to pass through the slot 40 and to engage in the notches 43. For this purpose, the cleat 50 has an active portion 501 whose shape is complementary to that of the notches 43. In FIGS. 4A and 4B, this active portion 501 is in the form of a collar defining the lower end of the cleat 50.

[0040] The two ends 51 of the support 5 are adapted to be inserted into the second slide 122 of the cover 12. When it is inserted into the second slide 122, the support 5 remains confined in the cover 12, that is to say that it does not protrude from the latter and that it is not visible. According to one embodiment, each end 51 has a bore 510 adapted to receive a guide axis making it possible to guide the translation of the support 5 in the second slide 122.

[0041] Figures 5A and 5B illustrate an example of button 6. Its shape is complementary to the recess 120 of the cover 12. Its upper face 60 is intended to be stressed by the user, preferably manually using his finger, or using a dedicated tool such as a center punch. Its lower face 61 forms a base configured to be inserted into the housing 126 of the cover 12. This housing 126 ensures the positioning of the button 6 in the cover 12 and forms a stop element retaining said button in said cover. The button 6 can be made of steel, plastic material, or any other material suitable to those skilled in the art. When positioned in the cover 12, the button 6 has a translation capacity in the ZZ direction.

[0042] The operation of the adjustment device will now be described in detail with reference to FIGS. 6A, 6B, 7A and 7B.

[0043] Referring to Figures 6A and 6B, when the support 5 is mounted in the cover 12, a guide pin 52 is installed in each of the aforementioned holes 510. These guide pins 52 are held in position in the housings forming the second slide 122 by means of closing plates 1220 closing said slide. The plates 1220 can be tightly fitted into the housings 122 or fixed by gluing, welding, screwing, etc. The pins 52 are for example screwed into the plates 1220.

[0044] At least one elastic constraint member 7 cooperates with the support 5. In Figures 6A and 6B, an elastic member 7 is installed in each of the housings 122. A device comprising a single elastic constraint member 7 is however conceivable. According to one embodiment, each member 7 is in the form of a helical comprehension spring installed around the corresponding guide axis 52 and bearing on one side on the plate 1220 and on the other side on the support 5. The springs 7 are thus perfectly held in position. Other types of elastic members can however be provided, such as leaf springs or elastomer blocks. The elastic constraint members 7 are arranged to push the support 5 upwards (in the ZZ direction).

[0045] When the button 6 is at rest (figures 6A, 7A), that is to say that it is not actuated, the elastic members 7 constrain the support 5 so that the cleat 50 passes through the slot 40 and its active portion 501 engages in one of the notches 43. Its upper end 500 is in contact with the face 61 of the button 6. In this position, the slider 4 is locked in position due to the locking of the cleat 50 in a notch 43, and cannot translate in the adjustment direction XX.

[0046] When the button 6 is actuated, that is to say when it is urged in the direction ZZ (illustrated by the arrow in FIGS. 6B, 7B), it pushes back the cleat 50 which translates along its longitudinal axis, carrying with it the support 5 and causing the compression of the elastic members 7. The cleat 50 thus performs a first technical function consisting of serving as a stop member pushing back the support 5. The cleat 50 is pushed back until reaching a position where it is released from the notches 43, in particular its active portion 501. The upper end 500 of the cleat 50 remains however engaged in the slot 40. But to the extent that the cleat 50 and the slot 40 are mounted to slide relative to said cleat, until reaching a desired adjustment position for the length of the bracelet (for example a length adjustment corresponding to an offset of two notches). The cleat 50 thus provides a second technical function consisting of guiding the translation of the slider 4. The sliding of the slider 4 is illustrated by the double arrow in [Fig.7B].

[0047] When the cleat 50 has a shape such as illustrated in [Fig.4B], its flat lateral faces make it possible to block the lateral movements of the slider 4, and perform part of the function of the aforementioned first slide 121. This first slide can then either be removed, or be configured more simply, to only block the transverse movements of the slider 4.

[0048] When the desired adjustment position is reached, the button 6 is released. The elastic members 7 then constrain the support 5 to bring back the cleat 50 which translates along its longitudinal axis ZZ, until reaching a position where it locks in a notch 43 and blocks the slide 4 in position. The cleat 50 thus performs a third technical function consisting of serving as a locking member for the slide 4.

[0049] The clasp further comprises a closing device for holding the closing clip 1 in the closed position. This closing device is functionally independent of the bracelet length adjustment device described above. In other words, the closing device operates independently of the adjustment device and vice versa. The closing device may thus be suitable for a clasp comprising another type of adjustment device or for a clasp without an adjustment device.

[0050] In Figures 8A and 8B, the closing device 8 is arranged in a recess 1110 arranged in the center of one end 111 of the second strip 11. Referring to [Fig.8C], the recess 1110 is crossed by two coaxial lateral bores 1111 and by a longitudinal bore 1112 located at the front of said recess. The recess 1110 is further crossed by a blind bore 1113 coaxial with the longitudinal bore 1112 and located at the rear of said recess.

[0051] Referring to Figures 8A, 8B, 9A and 9B, the closing device 8 comprises a lock 80 secured to an actuating member 81. The lock 80 is for example in the form of a pin. It is housed in the longitudinal bore 1112. In an advanced locking position (Figures 8A, 9A), one of its ends 800 protrudes from the front face of the second strip 11. According to one embodiment, the other end of the latch 80 extends into the blind bore 1113 in which a spring 11130 is installed which maintains said latch in the locking position.

[0052] The actuating member 81 comprises two sliding rollers 810 mounted to move in rotation along an axis (ZZ) perpendicular to the longitudinal axis (XX) of the lock 80. The rollers 810 are arranged symmetrically with respect to the longitudinal axis of the lock 80.

[0053] The closing device 8 also comprises two pressure buttons 82 each mounted in one of the lateral bores 1111. The buttons 82 each have a longitudinal axis (YY) perpendicular to the longitudinal axis (XX) of the lock 80 and to the axis of rotation of the rollers 810. Each button 82 has an end 820 located in the recess 1110 and in contact with one of the rollers 810. According to one embodiment, this end 820 has an inclined face or a conical surface in oblique contact (preferably 45° ± 5°) with the roller 810. The other end of the buttons 82 is located outside the recess 1110 and has a pressure zone 821 actuable by the user.

[0054] According to one embodiment, the buttons 82 also pass through coaxial lateral bores 1211 made in the aforementioned cover 12 and visible in particular in FIGS. 2A and 2B. The buttons 82 thus make it possible to secure the cover 12 to the strip 11. The cover 12 also covers the closing device 8 so that the latter is neither visible nor accessible to the user.

[0055] Figures 9A and 9B illustrate the locking and unlocking of the closing device 8. When the buttons 82 are not pressed by the user ([Fig.9A]), the spring 11130 pushes the lock 80 into the advanced locking position. Its end 800 then engages with an end 101 of the first strip 10, the latter advantageously having a beak engaging on said end 800. In this locking position, the closing clip 1 is closed and the strips 10, 11 are kept folded and superimposed.

[0056] When the buttons 82 are manually actuated by the user ([Fig.9B]) by slight pressure on the zones 821, the ends 820 press against the rollers 810 so as to push the actuating member 81 backwards, carrying with it the lock 80. The latter retracts into the retracted unlocking position by compressing the spring 11130, until its end 800 disengages from the end 101 of the first strip 10. In this unlocking position, the closing clip 1 is open and the strips 10, 11 are free to pivot at their end 100, 110 to open the bracelet.

[0057] The main advantage of using rollers 820 is that the friction between the ends 820 and the actuating member 81 is almost zero so that the force required for unlocking is extremely low and the wear phenomena are minimal. The maintenance, replacement or repair phases of the closing device 8 are therefore greatly reduced.

[0058] According to an embodiment illustrated in Figures 10A, 10B, 11A and 11B, the second strip 11 is made up of two parts 11a, 11b mounted to slide relative to each other, so that said second strip has a telescopic deployment capacity. According to one embodiment, the part 11a which is integral with the cover 12 comprises a slide adapted to receive the second part 11b, which slide extends in the direction of adjustment of the watch strap.

[0059] In Figures 10A and 10B, the two parts 11a, 11b are in a folded position where part 11a is retracted into part 11b. This is a position where the slats 10, 11 can overlap so that the closing clip 1 can be closed.

[0060] In Figures 10A and 10B, the two parts 11a, 11b are in an unfolded position where the part 11a slides out of the part 11b so that the length of the strip 11 is increased. This telescopic deployment capability is particularly advantageous for the user. It allows the strip 11 to expand, which may be useful for fitting the bracelet around the user's hand, which is generally wider than the wrist. Once the bracelet is fitted, the strip 11 can then be retracted for a precise fit around the wrist. This not only improves comfort and ease of use, but also broadens the applicability of the clasp to a wider variety of hand and wrist sizes.

[0061] The arrangement of the various elements and / or means and / or steps of the invention, in the embodiments described above, should not be understood as requiring such an arrangement in all implementations. In any event, it will be understood that various modifications may be made to these elements and / or means and / or steps, without departing from the spirit and scope of the invention.

[0062] Furthermore, one or more features disclosed only in one embodiment may be combined with one or more other features disclosed only in another embodiment. Similarly, one or more features disclosed only in one embodiment may be generalized to other embodiments, even if that or those features are described only in combination with other features.

Claims

Claims

1. Watch strap clasp comprising: - a closing clip (1) formed of articulated strips (10, 11) and a cover (12) which overlap when said clip is in a closed position, - a device for adjusting the length of the strap installed in the cover (12), characterized in that the adjustment device comprises: - a slider (4) confined in the cover (12) and having a guide slot (40) extending in an adjustment direction (XX), positioning notches (43) being arranged in said slot, - a support (5) carrying at least one lug (50) passing through the slot (40) and configured to engage in the notches (43), said lug and said slot being mounted to slide relative to each other, said lug having an upper end (500) and a lower end (501) defining a longitudinal axis (ZZ) normal to the guide direction (XX),- at least one elastic constraint member (7) cooperating with the support (5), - an actuable button (6) arranged in the cover (12), which button has a face (61) in contact with the upper end (500) of the cleat (50), and in which: - the actuation of the button (6) pushes back the cleat (50) which translates along its longitudinal axis (ZZ), until reaching a position where it is released from the notches (43) so that the slide (4) can slide relative to said cleat until reaching a desired adjustment position, - when the button (6) is released, the elastic member (7) constrains the support (5) to bring back the cleat (50) which translates along its longitudinal axis (ZZ), until reaching a position where it locks in a notch (43) and blocks the slide (4) in position.,

2. Clasp according to claim 1, in which the slider (4) is movably mounted in a first slide (121) arranged inside the cover (12), which first slide extends in the adjustment direction (XX).

3. Clasp according to one of the preceding claims, in which the support (5) is mounted movable in translation in a second slide (122) arranged inside the cover (12), which second slide extends in the height of said cover, in a direction (ZZ) perpendicular to the adjustment direction (XX).

4. Clasp according to claim 3, in which the support (5) has two ends (51), each end comprising a bore (510) receiving a guide axis (52) for guiding the translation of said support in the second slide (122).

5. Clasp according to claim 4, in which: - the second slide (122) has two housings in which the ends (51) of the support (5) are inserted, - an elastic constraint member (7) is installed in each of said housings, - each said constraint member (7) is in the form of a helical comprehension spring installed around the corresponding guide axis (52) and bearing on one side on a closing plate (1220) of the corresponding housing and on the other side on the support (5).

6. Clasp according to one of the preceding claims, in which one of the strips (11) is made up of two parts (11a, 11b) mounted to slide relative to each other, so that said strip has a telescopic deployment capacity.

7. Clasp according to one of the preceding claims, further comprising a closing device (8) for holding the closing clip (1) in the closed position, which closing device comprises: - a lock (80) held in the advanced locking position by a spring (11130), - an actuating member (81) connected to the lock (80) and having sliding rollers (810), - pressure buttons (82) whose ends (820) are in contact with the rollers (810) so that by pressing said buttons, said ends press against said rollers so as to push back the actuating member (81), driving the lock (80) with it to a retracted unlocking position.

8. Adjustable watch strap comprising: - a first segment (2) and a second segment (3), which segments are composed of articulated links (20, 30), - a clasp, characterized in that the clasp is in accordance with one of the preceding claims and in which: - one end of the first segment (2) is connected to one of the strips (10), - one end of the second segment (3) is connected to the slider (4).

9. Watch comprising an adjustable bracelet, characterized in that said bracelet conforms to claim 8.

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