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

Abstract

The invention relates to a watch strap clasp comprising: - a closure clip formed of articulated strips and a cover which overlap when said clip is in a closed position, - a strap length adjustment device installed in the cover, the adjustment device comprising: - a slide confined within the cover and having a guide slot extending in an adjustment direction, positioning notches being provided in said slot, - a support carrying at least one lug passing through the slot and configured to engage in the notches, said lug and said slot being mounted for relative sliding, said lug having an upper end and a lower end defining a longitudinal axis normal to the guidance direction, - at least one elastic constraint element cooperating with the support, - an actuable button arranged in the cover.which button has a face in contact with the upper end of the stop, and in which: - the actuation of the button pushes back the stop, which translates along its longitudinal axis, until it reaches a position where it is disengaged from the notches so that the slide can slide relative to said stop until it reaches a desired adjustment position, - when the button is released, the elastic element forces the support to return the stop, which translates along its longitudinal axis, until it reaches a position where it locks into a notch and blocks the slide in position.

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 watch strap closures 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 encircling the user's wrist; and a clasp allowing the strap to be fixed around the wrist.

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

[0005] Some clasps include an adjustment device allowing for finer adjustment of the bracelet length to the wrist size. Such an adjustment device is described, for example, in patent document JP2582413Y2. However, this type of adjustment device is relatively complex to manufacture and requires a significant number of parts to function. This results in substantial operating costs and time associated with the assembly, maintenance, replacement, or repair of the adjustment device. Furthermore, the size of these adjustment devices is generally considerable, making the clasp system rather unattractive.

[0006] The invention aims to remedy all or part of the aforementioned drawbacks. In particular, the invention aims to achieve all or part of the following objectives: simplify the design of the adjustment device; reduce the number of parts required for the operation of the adjustment device; ensure precise adjustment of the bracelet length; design an adjustment device that is simple and quick to operate; reduce the costs and operational time associated with the assembly and maintenance phases. for replacing or repairing the adjustment device; designing an adjustment device that is compact and preserves the aesthetics of the locking system. Presentation of the invention

[0007] The solution proposed by the invention is a watch strap clasp comprising: - a locking clip consisting of articulated strips and a cover that overlap when said clip is in a closed position, - a bracelet length adjustment device installed in the lid, the adjustment device comprising: - a slide confined within the cover and having a guide slot extending in an adjustment direction, with positioning notches being provided 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 for relative sliding, said cleat having an upper end and a lower end defining a longitudinal axis normal to the guiding direction, - at least one elastic constraint element 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: - Activating the button pushes back the stop, which translates along its longitudinal axis until it reaches a position where it is disengaged from the notches, allowing the slider to move relative to said stop until it reaches the desired adjustment position. - when the button is released, the elastic element forces the support to bring back the cleat which translates along its longitudinal axis, until it reaches a position where it locks into a notch and blocks the slide in position.

[0008] The design of this adjustment device is simplified compared to the aforementioned prior art adjustment devices. In particular, the number of parts ensuring its operation is reduced, which facilitates not only initial assembly but also maintenance, replacement, or repair, while also limiting the risk of mechanical failures. This reduction in the number of parts is achieved in particular by the triple function of the stop, which serves simultaneously as a stop pushing back the support, a guide for the slide, and a locking mechanism for the slide.

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

[0010] In addition, the use of an actuable button to control the cleat and an elastic element ensuring that said cleat automatically returns to a locking position when said button is released, allows for a quick and intuitive adjustment of the bracelet length.

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

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

[0013] According to one embodiment, the slide is mounted movable in a first slide provided inside the cover, which first slide extends in the direction of adjustment.

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

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

[0016] According to one embodiment: - the second slide has two housings into which the ends of the support are inserted; - an elastic constraint element is installed in each of said housings; - each said constraint element 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 consists 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 closure clip in the closed position, which device The closure comprises: - a lock held in the forward locking position by a spring; - an actuating member connected to the lock and having sliding rollers; - pressure buttons whose ends are in contact with the rollers so that by pressing said buttons, said ends press against said rollers in order to push back the actuating member, carrying with it the lock to a rearward unlocking position.

[0019] Another aspect of the invention relates to an adjustable watch bracelet 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 slats, 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 strap conforming to the preceding characteristics. Brief description of the figures

[0021] Other advantages and features of the invention will become more apparent from the description of the embodiments which will follow, with reference to the attached drawings, made by way of indicative and non-limiting examples and on which: [Fig.1] 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 closure clip according to the invention. [Fig.2B] is a view from below of the lid 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 view from below of the plate in [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 in [Fig.5A]. [Fig. A] is a cross-sectional view of a clasp according to the invention, with the button released. [Fig. B] is a cross-sectional view of a clasp according to the invention, with the button being actuated. [Fig.7A] is a longitudinal sectional view of a clasp according to the invention, with the button released. [Fig.7B] is a longitudinal sectional view of a clasp according to the invention, with the button being actuated. [Fig.8A] illustrates a closing device. [Fig.8B] shows the locking device in the locked position. [Fig.8C] shows a slat configured to receive the closing device. [Fig.9A] shows the arrangement of constituent elements of the closing device, the said device not being actuated. [Fig.9B] shows the arrangement of constituent elements of the closing device, said device being actuated. [Fig.lOA] is a top view of a clasp according to the invention in an open position and whose slats are in a first deployed position. [Fig.1OB] is a side view of the clasp of [Fig.1OA]. [Fig.l IA] is a top view of the clasp of [Fig.lOA] with the lamellae in a second deployed position. [Fig.llB] is a side view of the clasp of [Fig.l]lA. Weighing of implementation methods

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

[0023] With reference to [Fig. 1], the clasp comprises a closure clip 1 conventionally formed of hinged tabs 10, 11 and a cover 12 which overlap when the clip is in a closed position. The tabs 10, 11 are hinged at one of their respective ends 100, 110. They are generally in the form of flat, rigid metal pieces.

[0024] The clasp of the invention can be fitted to any type of watch strap, but is particularly suitable for straps comprising two segments 2, 3 made of articulated links 20, 30 (for example, made of metal or plastic). In [Fig. 1], one end of a first segment 2 is connected to a first tab 10 and one end of a second segment 3 is connected to the cover 12 as explained further in the description. The first tab 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] A bracelet length adjustment device is installed in the cover 12. This adjustment device comprises a slide 4 confined within the cover 12, a support 5 carrying at least one lug 50, and an actuable button 6 arranged in said cover.

[0026] In Figures 2A and 2B, the lid 12 is substantially parallelepiped in shape, but other shapes are possible (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 lid 12 can be made of steel, plastic, or any other material suitable to those skilled in the art.

[0027] The cover 12 has, on its upper face, a central recess 120 configured to receive the button 6. This recess 120 is circular in shape here, but other shapes can be considered (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 formed on the inner wall of the upper face of the cover 12.

[0028] According to an embodiment illustrated in [Fig.2B], a first slide 121 is provided 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 formed directly into the side walls of the cover 12, thus avoiding the need for additional parts and increasing compactness. The first slide 121 extends in a direction for adjusting 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 main function of the first slide 121 is to prevent lateral (along axis YY) and transverse (along axis ZZ) movement of the slide 4, which can only move along the direction of movement XX, resulting in more precise and stable adjustment. The first slide 121 also makes the adjustment device more robust, particularly when the clasp is subjected to unforeseen external stresses such as shocks or vibrations.The first slide 121 also facilitates the mounting of the slide 4 as well as maintenance or replacement operations. This first slide is not, however, 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 provided 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 above, this second slide 122 is advantageously formed 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 (axis of height or depth) perpendicular to the adjustment direction XX of the cover 12. In addition to facilitating the assembly, maintenance and / or replacement of the support 5, the main function of the second slide 122 is to prevent lateral and longitudinal movement of said support, which can only move in the height of the cover 12 along the axis ZZ, so that the adjustment device is more stable and robust.This second slide is not necessary for the operation of the adjustment device, but it helps to improve it.

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

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

[0033] The slide 4 also has positioning notches 43 arranged in the slot 40, advantageously on the lower face 42 of the slide 4. These notches 43 are adjacent and aligned along the slot 40. In [Fig. 3B], there are four notches 43, but a smaller number (for example, two) or a larger number (for example, ten) can be provided depending on the desired adjustment capacity. Each notch 43 corresponds to one 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 lug 50 described later. The notches 43 are not necessarily circular, but may be rectangular, square, oval, polygonal, etc. By way of example, the diameter of the notches 43 is between 0.7 cm and 1 cm, their centers being spaced at least this distance 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 "coarse" adjustment of the bracelet length can be made by adjusting the number of links 20, 30. And a more "fine" adjustment is made by means of the position of the notch 50 in the notches 43, as explained further in the description.

[0036] The slide 4 also includes, at one of its 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 connecting 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] With reference 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 between 0.5 cm and 1 cm, and its height between 0.5 cm and 1 cm. The support 5 can be made of steel, plastic, or any other material suitable to those skilled in the art. When 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 includes at least one lug 50 projecting along the aforementioned direction ZZ. More specifically, the lug 50 has an upper end 500 and a lower end 501, which ends define a longitudinal axis ZZ normal to the guiding direction XX. In [Fig. 4A], the lug 50 is generally cylindrical, and in [Fig. 4B] it is generally parallelepiped-shaped. The lug 50 has, for example, a height between 0.15 cm and 1 cm and a diameter (or width) adjusted to the width of the slot 40, i.e., between 0.1 cm and 2.5 cm. The lug 50 can be attached to the support 5 or directly formed within it.

[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 figures 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 fit into the second slide 122 of the cover 12. When inserted into the second slide 122, the support 5 remains confined within the cover 12; that is, it does not protrude from it and is not visible. In one embodiment, each end 51 has a hole 510 adapted to receive a guide pin for guiding the translation of the support 5 within the second slide 122.

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

[0042] The operation of the adjustment device will now be described in detail with reference to figures 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 recesses forming the second slide 122 by means of closing plates 1220 that close said slide. The plates 1220 can be press-fitted into the recesses 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 element 7 cooperates with the support 5. In Figures 6A and 6B, an elastic element 7 is installed in each of the housings 122. However, a device comprising only one elastic constraint element 7 is conceivable. In one embodiment, each element 7 is in the form of a helical grasping 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 elements can, however, be provided, such as leaf springs or elastomer blocks. The elastic constraint elements 7 are arranged to push the support 5 upwards (in the direction ZZ).

[0045] When the button 6 is at rest (figures 6A, 7A), i.e., not actuated, the elastic members 7 constrain the support 5 so that the stop 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 slide 4 is locked in position due to the locking of the stop 50 in a notch 43, and cannot translate in the adjustment direction XX.

[0046] When the button 6 is actuated, that is, when it is pressed in the direction ZZ (illustrated by the arrow in Figures 6B, 7B), it pushes back the stop 50, which translates along its longitudinal axis, carrying the support 5 with it and compressing the elastic elements 7. The stop 50 thus performs a primary technical function, acting as a stop element that pushes back the support 5. The stop 50 is pushed back until it reaches a position where it is disengaged from the notches 43, in particular its active portion 501. The upper end 500 of the lug 50 remains engaged in the slot 40. However, since the lug 50 and the slot 40 are mounted for relative sliding, the slider 4 is free to slide relative to said lug until it reaches a desired adjustment position for the bracelet length (for example, a length adjustment corresponding to a shift of two notches). The lug 50 thus performs a second technical function, which is to guide the translation of the slider 4. The sliding of the slider 4 is illustrated by the double arrow in [Fig. 7B].

[0047] When the stop 50 has a shape as illustrated in [Fig. 4B], its flat lateral faces allow the lateral movement of the slide 4 to be blocked, and perform part of the function of the first slide 121 mentioned above. This first slide can then either be omitted or configured more simply to block only the transverse movement of the slide 4.

[0048] When the desired adjustment position is reached, the button 6 is released. The elastic elements 7 then constrain the support 5 to return the stop 50, which translates along its longitudinal axis ZZ, until it reaches a position where it locks into a notch 43 and locks the slide 4 in position. The stop 50 thus performs a third technical function, serving as a locking element for the slide 4.

[0049] The clasp further includes a closing device for holding the clasp 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 can therefore be used with a clasp that has a different type of adjustment device or with a clasp that does not have an adjustment device.

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

[0051] With reference to Figures 8A, 8B, 9A and 9B, the locking device 8 comprises a latch 80 integral with an actuating member 81. The latch 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 slat 11. According to one embodiment, the other end of the lock 80 extends into the blind bore 1113 in which is installed a spring 11130 which holds said lock in the locked position.

[0052] The actuation member 81 comprises two sliding rollers 810 mounted movable in rotation about 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 locking device 8 also includes two push buttons 82, each mounted in one of the lateral bores 1111. Each button 82 has 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. In one embodiment, this end 820 has an inclined face or a conical surface in oblique contact (preferably at 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 that can be operated by the user.

[0054] According to one embodiment, the buttons 82 also pass through coaxial lateral bores 1211 formed in the aforementioned cover 12 and visible in particular in Figures 2A and 2B. The buttons 82 thus make it possible to secure the cover 12 to the slat 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 closure device 8. When the buttons 82 are not pressed by the user ([Fig. 9A]), the spring 11130 pushes the latch 80 into the advanced locking position. Its end 800 then engages with an end 101 of the first slat 10, the latter advantageously having a beak that engages with said end 800. In this locked position, the closure clip 1 is closed and the slats 10, 11 are held folded and overlapping.

[0056] When the buttons 82 are manually operated by the user ([Fig.9B]) by a slight pressure on the areas 821, the ends 820 press against the rollers 810 so as to push the actuating member 81 back, carrying with it the lock 80. The latter retracts into the rearward unlocked position by compressing the spring 11130, until its end 800 disengages from the end 101 of the first slat 10. In this unlocked position, the closing clip 1 is open and the slats 10, 11 are free to pivot at their ends 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 wear phenomena are minimal. 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, 1IA and 1IB, the second slat 11 consists of two parts 11a, 11b mounted to slide relative to each other, such that said second slat has a telescopic deployment capability. According to one embodiment, the part 11a that is integral with the cover 12 has 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 1la, 11b are in a folded position where part 1la 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 part 11a slides out of part 11b, thus increasing the length of the slat 11. This telescopic deployment capability is particularly advantageous for the user. It allows the slat 11 to extend, which can be useful for fitting the bracelet around the user's hand, which is generally wider than the wrist. Once the bracelet is in place, the slat 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 described only in one embodiment can be combined with one or more other features described only in another embodiment. Similarly, one or more features described only in one embodiment can be generalized to other embodiments, even if this or these features are described only in combination with other features.

Claims

1. Demands Watch strap clasp including: - 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 bracelet length adjustment device installed in the cover (12), characterized in that the adjustment device comprises: - a slide (4) confined in the cover (12) and having a guide slot (40) extending in an adjustment direction (XX), positioning notches (43) being provided in said slot, which notches are in the form of adjacent counterbores, - 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 for relative sliding, said lug having an upper end (500) and a lower end (501) defining a longitudinal axis (ZZ) normal to the guide direction (XX), which lug having an active portion (501) whose shape is complementary to that of the notches (43), - at least one elastic stress 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: - Activating the button (6) pushes back the stop (50) which translates along its longitudinal axis (ZZ), until it reaches a position where the active portion (501) is clear of the notches (43) so that the slider (4) can slide relative to said stop until it reaches a desired adjustment position, - when the button (6) is released, the elastic element (7) forces the support (5) to bring back the lug (50) which translates along its longitudinal axis (ZZ), until it reaches a position where it locks into a notch (43), the active portion (501) engaging in said notch, and locks in position the slide (4) which cannot translate along the adjustment direction (XX).

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

3. Clasp according to any one of the preceding claims, wherein the support (5) is mounted movably in translation in a second slide (122) provided 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, wherein the support (5) has two ends (51), each end having a hole (510) receiving a guide pin (52) to guide the translation of said support in the second slide (122).

5. A clasp according to claim 4, in which: - the second slide (122) has two housings into 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. A clasp according to any one of the preceding claims, wherein one of the slats (11) is made up of two parts (1a, 11b) mounted to slide relative to each other, so that said slat has a telescopic deployment capability.

7. A clasp according to any one of the preceding claims, further comprising a locking device (8) for holding the locking clip (1) in the closed position, said locking device comprising: - a latch (80) held in the advanced locking position by a spring (11130), - an actuating member (81) connected to the latch (80) and having sliding rollers (810), - push buttons (82) having ends (820) in contact with the rollers (810) such that, upon pressing said buttons, said ends press against said rollers so as to push back the actuating member (81), carrying the lock (80) with it to a recoiled unlocking position.

8. Clasp according to any one of the preceding claims, wherein the active portion (501) is in the form of a collar defining the lower end of the cleat (50).

9. 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 conforms to one of the preceding claims and in which: - one end of the first segment (2) is connected to one of the slats (10), - one end of the second segment (3) is connected to the slider (4).

10. Watch comprising an adjustable strap, characterized in that said strap conforms to claim 9.

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