Watch wristband lock catch with wristband length adjusting device

Abstract

The invention relates to a wristband latch for a watch, comprising: a locking buckle formed by a hinged sheet and a cover plate which overlap each other when the buckle is in a closed position, a wristband length adjustment device mounted in the cover plate, the adjustment device comprising: a slide, the invention relates to an adjustment device for a motor vehicle, comprising a cover plate, which is bounded in the cover plate and has a guide slot extending in the direction of adjustment, in which slot a positioning recess is provided, a support carrying at least one locking piece, which passes through the slot and is configured to engage into the recess, the locking piece and the slot being mounted in a relatively sliding manner, the locking piece having an upper end and a lower end, the invention relates to a locking device comprising a support defining a longitudinal axis perpendicular to a guide direction, at least one resilient constraining member cooperating with said support, a trigger button disposed in a cover plate, the button having a contact surface in contact with the upper end of a locking piece, in which: the trigger button urges said locking piece in translation along its longitudinal axis to a position in which said locking piece is released from a recess, and a resilient member that, when the push button is released, constrains the bracket such that the locking piece translates along its longitudinal axis back to a position in which it is locked in the recess and locks the sliding piece in place, whereby the slider is able to slide relative to the locking piece to a desired adjustment position,-when the push button is released, the resilient member constrains the bracket such that the locking piece translates along its longitudinal axis back to a position in which it is locked in the recess.

Description

Technical Field

[0001] The object of the present invention is a watch bracelet clasp with a bracelet length adjustment device. The object of the present invention is also a bracelet and a watch equipped with such a bracelet.

[0002] The present invention relates to the general technical field of timepieces, and more particularly to the locking of watch bracelets with a bracelet length adjustment device. Background Art

[0003] A watch generally consists of the following components: a watch case housing a watch mechanism (including a dial and hands); a bracelet that surrounds the user's wrist; and a locking clasp for securing the bracelet around the wrist.

[0004] Length adjustment of the bracelet is particularly useful for bracelets whose bracelet part consists of articulated links (metal or plastic material). For this type of bracelet, length adjustment is usually achieved by adjusting the number of links according to the size of the user's wrist. However, this technique does not allow precise adjustment of the bracelet length.

[0005] Some locking clasps have adjustment devices that allow for a finer adjustment of the bracelet length according to the wrist size. For example, such adjustment devices are described in the patent documents JP2582413Y2 or CH698981B1. However, this type of adjustment device is relatively complex to manufacture and requires a large number of parts to be manipulated. This results in high operating costs and time associated with the installation, maintenance, replacement, or repair procedures of the adjustment device. In addition, the size of these adjustment devices is generally large, so the locking system is not very aesthetically pleasing.

[0006] In the above-mentioned patent document CH698981B1, the slider installed in the cover plate has a guide groove extending in the adjustment direction, and the groove has positioning notches. The locking block engages through the slot into the notch. By simply triggering the button, the locking block is pushed back to the position where it is released from the notch, so that the slider can slide and reach the desired adjustment position. When the button is released, the locking block engages into the notch to lock the slider in place. However, when the locking block engages into the notch, the shape of the latter does not prevent accidental translation of the slider, especially in the direction of shortening the bracelet length. In fact, the slope shape of the notch allows the locking block to move from one notch to another. Therefore, the adjustment of the bracelet length is unreliable.

[0007] The present invention aims to overcome all or part of the above-mentioned defects. The present invention particularly aims to achieve all or part of the following objectives: simplify the design of the adjustment device; reduce the number of parts required to operate the adjustment device; ensure precise and reliable adjustment of the bracelet length; design an adjustment device that is simple and quick to operate; reduce the operating costs and time associated with the installation, maintenance, replacement, or repair procedures of the adjustment device; design a compact adjustment device that maintains the aesthetic appearance of the locking system. Summary of the Invention

[0008] The solution proposed by the present invention is a watch strap buckle, which has:

[0009] - A locking buckle formed by a hinged thin plate and a cover plate, which overlap each other when the buckle is in the closed position,

[0010] - A wristband length adjustment device installed in the cover plate,

[0011] The adjustment device has:

[0012] - A slider, which is restricted in the cover plate and has a guiding slot extending in the adjustment direction, and a counterbore-shaped positioning notch is provided in the slot,

[0013] - A bracket, which carries at least one locking block. The locking block passes through the slot and is configured to engage into the notch. The locking block and the slot are installed in a relatively sliding manner. The locking block has an upper end and a lower end, which define a longitudinal axis perpendicular to the guiding direction. The locking block also has a movable part, whose shape is complementary to the shape of the notch,

[0014] - At least one elastic constraint member, which cooperates with the bracket,

[0015] - A trigger button provided in the cover plate, which has a contact surface contacting the upper end of the locking block,

[0016] Wherein:

[0017] - The trigger button pushes the locking block to translate along its longitudinal axis to a position where the movable part (501) is released from the notch, so that the slider can slide relative to the locking block to the desired adjustment position,

[0018] - When the button is released, the elastic member constrains the bracket, so that the locking block translates along its longitudinal axis and returns to a position where the movable part (501) is locked into the notch, and locks the slider in place. The engagement of the movable part into the notch locks the translational freedom of the slider in the guiding direction.

[0019] Compared with the adjustment device of the above prior art, the design of this adjustment device is simplified. In particular, the number of parts ensuring its operation is reduced, which is not only beneficial to initial assembly, but also to maintenance, replacement or repair processes, and the risk of mechanical failure is also limited. The reduction in the number of parts is mainly ensured by the triple function of the locking block, which simultaneously serves as a stop member for pushing back the bracket, a guiding member for the slider, and a locking member for the slider.

[0020] In addition, this original design allows reducing the compactness of the adjustment device, so that it can be very simply integrated into the cover plate of the buckle, maintaining the aesthetics of the wristband locking system.

[0021] Moreover, since the shape of the notch is a counterbore shape and is complementary to the shape of the movable part of the lock block, when the movable part engages into the notch, all risks of accidental translation of the slider can be eliminated. Therefore, the length adjustment of the wristband is particularly reliable.

[0022] In addition, using a triggerable button to control the lock block and the elastic member (ensuring that when the button is released, the lock block automatically returns to the locked position) allows for a quick and intuitive adjustment of the length of the wristband.

[0023] Therefore, the target device of the present invention effectively meets all the established objectives, providing a practical, economical and aesthetic solution for adjusting the length of the watch wristband.

[0024] The following lists other advantageous features of the present invention. Each of these features can be utilized alone or in combination with the other above-mentioned advantageous features. Each of these features helps to solve the specific technical problems further proposed in the specification as necessary, and the other features proposed above do not necessarily relate to these problems. Therefore, the following features can be used as one or more divisional patent applications as necessary:

[0025] According to one embodiment, the slider is movably mounted in a first slideway provided in the cover plate, and the first slideway extends along the adjustment direction.

[0026] According to one embodiment, the bracket is movably mounted and can be translated in a second slideway provided in the cover plate, and the second slideway extends along the height of the cover plate in a direction perpendicular to the adjustment direction.

[0027] According to one embodiment, the bracket has two ends, and each end has a hole for receiving a guide shaft to guide the translation of the bracket in the second slideway.

[0028] According to one embodiment: - The second slideway has two slots into which the ends of the bracket are inserted; - An elastic restraint member is mounted in each of the slots; - Each of the restraint members is in the form of a helically wound compression spring mounted around the corresponding guide shaft, with one side abutting against the closing plate of the corresponding slot and the other side located on the bracket.

[0029] According to one embodiment, one of the sheets consists of two parts that slide relative to each other, such that the sheet has the ability to expand and contract telescopically.

[0030] According to one embodiment, the buckle further has a locking device for holding the locking latch in the closed position, the locking device having: - a lock, held in the locked extended position by a spring; - an actuating member, connected to the lock and carrying a sliding roller; - a button, the end of which contacts the roller such that when the button is pressed, the end abuts against the roller, thereby pushing back the actuating member and driving the lock with it to the unlocked retracted position.

[0031] Another aspect of the present invention relates to an adjustable watch strap having: - a first section and a second section, the sections being formed of articulated links; - a buckle conforming to one of the above features, wherein one end of the first section is connected to one of the links and one end of the second section is connected to a slider.

[0032] Another aspect of the present invention relates to a watch with an adjustable wrist strap conforming to the above features. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Other advantages and features of the present invention will be better understood by reading the following detailed description and referring to the drawings given as indicative and non-limiting examples, wherein the drawings are:

[0034] Figure 1 View of the buckle according to the invention in the closed position.

[0035] Figure 2A Top view of the cover plate of the locking latch according to the invention.

[0036] Figure 2B For Figure 2A Bottom view of the middle cover plate in

[0037] Figure 3A Top view of the movable plate of the adjusting device according to the invention.

[0038] Figure 3B For Figure 3A Bottom view of the middle plate in

[0039] Figure 4A View of the lock block bracket of the adjusting device according to the invention.

[0040] Figure 4B View of the lock block bracket according to an implementation variant.

[0041] Figure 5A Top view of the button of the adjusting device according to the invention.

[0042] Figure 5B For Figure 5A Bottom view of the middle button in

[0043] Figure 6AA transverse cross-sectional view of the latch according to the present invention, where the button is released.

[0044] Figure 6B A transverse cross-sectional view of the latch according to the present invention, where the button is triggered.

[0045] Figure 7A A longitudinal cross-sectional view of the latch according to the present invention, where the button is released.

[0046] Figure 7B A longitudinal cross-sectional view of the latch according to the present invention, where the button is triggered.

[0047] Figure 8A A locking device is shown.

[0048] Figure 8B The locking device in the locked position is shown.

[0049] Figure 8C A sheet configured to accommodate the locking device is shown.

[0050] Figure 9A The layout of the components of the locking device is shown, where the device is not triggered.

[0051] Figure 9B The layout of the components of the locking device is shown, where the device is triggered.

[0052] Figure 10A A top view of the latch according to the invention in the open position, and its sheet is in the first deployed position.

[0053] Figure 10B For Figure 10A a side view of the latch in

[0054] Figure 11A For Figure 10A a top view of the latch in

[0055] Figure 11B For Figure 11A a side view of the latch in Detailed Description

[0056] For clarity, the following clarifications are made for certain terms used in the specification and claims:

[0057] - "X and / or Y" means: only X, or only Y, or X and Y.

[0058] - Unless otherwise specified, the use of ordinal adjectives such as "first", "second", etc. to describe an element merely indicates various instances of referring to similar elements and does not imply that the elements so described must be in a given order, whether in terms of time, space, classification, or in any other way.

[0059] - Generally speaking, it can be understood that in the respective drawings, the objects are drawn arbitrarily for the convenience of reading the drawings.

[0060] Referring Figure 1 , the buckle includes a locking catch 1, which is generally formed by articulated flakes 10, 11 and a cover plate 12, which overlap each other when the catch is in the closed position. The flakes 10, 11 are articulated at their respective ends 100 and 110. They are generally in the form of flat, rigid metal parts.

[0061] The target buckle of the present invention can be used for any type of watch strap, but is particularly suitable for a two-piece 2, 3 strap composed of articulated links 20, 30 (such as metal or plastic material). In Figure 1 , one end of the first section 2 is connected to the first flake 10, and one end of the second section 3 is connected to the cover plate 12, as explained below in the specification. For example, the first flake 10 has a hole 102, which is adapted to receive a positioning pin (not shown), ensuring the connection between the end of the first section 2 and the said flake. Generally, the respective other ends of each of the sections 2, 3 are connected to the watch case (not shown).

[0062] A wristband length adjustment device is installed in the cover plate 12. Such an adjustment device includes a slider 4 restricted in the cover plate 12, a bracket 5 with at least one locking block 50, and a triggerable button 6 provided in the said cover plate.

[0063] In Figure 2A and 2B , the cover plate 12 is generally in the shape of a parallelepiped, but can also have other shapes (cylindrical, cubic, polyhedral, etc.). For example, its length is between 1 cm and 4 cm, its width is between 1 cm and 3 cm, and its height is between 0.5 cm and 1 cm. The cover plate 12 can be made of steel, plastic material, or any other material that can be used by those skilled in the art.

[0064] The cover plate 12 has a central recess 120 at its top surface, which is configured to receive the button 6. The recess 120 is circular here, but can also have other shapes (rectangular, square, oval, polygonal, etc.). Its diameter is, for example, between 0.5 cm and 2 cm. The recess 120 opens into a slot 126 formed on the inner wall of the top surface of the cover plate 12.

[0065] According to Figure 2BIn the embodiment shown, the first slideway 121 is provided inside the cover plate 12, and this slideway is adapted to accommodate the slider 4. Thus, it can freely slide into the first slideway 121.

[0066] The first slideway 121 is advantageously formed directly into the side wall of the cover plate 12 to avoid using additional attachment parts and to obtain compactness. The first slideway 121 extends in the adjustment direction of the watch strap. In Figure 2A and 2B this adjustment direction corresponds to the longitudinal axis X-X of the cover plate 12, generally corresponding to the longitudinal direction of the watch strap. The main function of the first slideway 121 is to prevent the lateral (Y-Y axis) and transverse (Z-Z axis) movement of the slider 4, and the slider can only move along the movement direction X-X, making the adjustment more precise and more stable. The first slideway 121 also makes the adjustment device more robust, especially when the buckle is subjected to accidental external stresses such as impacts or vibrations. The first slideway 121 also facilitates the assembly of the slider 4 and the maintenance or replacement operations. However, this first slideway is not essential for the operation of the adjustment device, but helps to improve it.

[0067] According to Figure 2B the embodiment shown, the second slideway 122 is provided inside the cover plate 12, and the slideway is adapted to accommodate the bracket 5. Thus, it can freely slide into the second slideway 122. For the same reasons as above, the second slideway 122 is advantageously formed directly into the side wall of the cover plate 12. The second slideway 122 extends along the height of the cover plate 12 in the Z-Z direction (height axis or depth axis) perpendicular to the adjustment direction X-X of the cover plate 12. In addition to facilitating the installation, maintenance and / or replacement of the bracket 5, the main function of the second slideway 122 is also to prevent the lateral and longitudinal movement of the bracket, and the bracket can only move in the Z-Z direction along the height of the cover plate 12, making the adjustment device more stable and more robust. This second slideway is not essential for the operation of the adjustment device, but helps to improve it.

[0068] In Figure 3A and 3B this, the slider 4 is in the form of a flat plate, generally rectangular. 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 height is between 0.1 cm and 0.7 cm. The slider 4 can be made of steel, plastic material or any other material that can be used by those skilled in the art. When the slider 4 is inserted into the buckle, it is still restricted within the cover plate 12, that is, it does not protrude from the cover plate and is not visible.

[0069] The slider 4 has a guiding slot 40 extending in the adjustment direction X-X. The slot 40 is through, i.e., it is open at the top surface 41 and the bottom surface 42 of the plate member 4. According to an embodiment, the slot 40 is in the form of a rectangular hole. For example, its length is between 0.5 cm and 2.5 cm, and its width is between 0.1 cm and 2.5 cm.

[0070] The slider 4 also has positioning notches 43 provided in the slot 40, advantageously at the bottom surface 42 of the slider 4. These notches 43 are adjacent and aligned along the slot 40. Figure 3B In, the number of notches 43 is four, but a smaller number (e.g., two) or a larger number (e.g., ten) can be set according to the expected adjustment ability. Each notch 43 corresponds to an adjustment position.

[0071] To simplify the design, the notches 43 are advantageously in the form of adjacent counterbores, the shape of which is adapted to accommodate the movable part of the locking block 50 to be described below in the specification. The counterbore-shaped notches 43 are not necessarily circular, but can be rectangular, square, elliptical, polygonal, etc. As an example, the diameter of the notches 43 is between 0.7 cm and 1 cm, and the distance between their centers is at least equal to their length.

[0072] According to a preferred embodiment, the spacing between two adjacent notches 43 (i.e., the distance between their centers) is less than the length of the links 20, 30. Therefore, a first "coarse" adjustment of the wristband can be performed by adjusting the number of links 20, 30. And a more "fine" adjustment is achieved by the position of the locking block 50 in the notch 43, as explained below in the specification.

[0073] The slider 4 also has connecting means at one of these edges for connecting the end of the second section 3 of the wristband. Such connecting means is, for example, in the form of connecting lugs 44, each having a hole 440, and the hole is adapted to receive a positioning pin (not shown), ensuring the connection between the end of the second section 3 and the lug.

[0074] Referring to Figure 4A and 4B , the bracket 5 generally has the shape of a parallelepiped. 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 bracket 5 can be made of steel, plastic material or any other material that can be used by those skilled in the art. When it is positioned in the cover plate 12, the longitudinal axis Y-Y of the bracket 5 is perpendicular to the above-mentioned axes X-X and Z-Z.

[0075] The bracket 5 has at least one locking block 50 protruding in the above-mentioned Z-Z direction. More specifically, the locking block 50 has an upper end 500 and a lower end 501, and the ends define a longitudinal axis Z-Z perpendicular to the guiding direction X-X.Figure 4A In [description of Figure 1], the locking block 50 is generally cylindrical, while in Figure 4B it is generally parallelepiped-shaped. The length of the locking block 50 is, for example, between 0.15 cm and 1 cm, and the diameter (or width) is adjusted to the width of the slot 40, i.e., between 0.1 cm and 2.5 cm. The locking block 50 can be attached to the bracket 5 or directly formed therein.

[0076] The locking block 50 is configured to pass through the slot 40 and engage into the notch 43. For this purpose, the locking block 50 has a movable part 501, the shape of which is complementary to the shape of the notch 43. In Figure 4A and 4B this movable part 501 is in the form of a flange, defining the lower end of the locking block 50.

[0077] The two ends 51 of the bracket 5 are adapted to be inserted into the second slideway 122 of the cover plate 12. When the bracket 5 is inserted into the second slideway 122, it is still restricted within the cover plate 12, i.e., it does not protrude from the cover plate and is not visible. According to an embodiment, each end 51 has a hole 510 adapted to receive a guiding shaft, and the guiding shaft allows guiding the translation of the bracket 5 in the second slideway 122.

[0078] Figure 5A and 5B show an example of the button 6. Its shape is complementary to the recess 120 of the cover plate 12. Its top surface 60 is intended to be operated by the user, preferably manually by the user's finger or a special tool such as a needle. Its bottom surface 61 forms a base, and the base is configured to be inserted into the slot 126 of the cover plate 12. The slot 126 ensures the position of the button 6 in the cover plate 12 and forms a stop member to hold the button in the cover plate. The button 6 can be made of steel, plastic material, or any other material that can be used by those skilled in the art. When it is positioned in the cover plate 12, the button 6 has the ability to translate in the Z-Z direction.

[0079] Now, the operation of the adjusting device will be described in detail with reference to Figure 6A 、 6B 、7A and 7B.

[0080] Referring to Figure 6A and 6B , when the bracket 5 is installed in the cover plate 12, the guiding shafts 52 are installed in each of the above-mentioned holes 510. Through the closing plate 1220 that closes the second slideway 122, these guiding shafts 52 are held in place in the slot forming the slideway. The plate member 1220 can be tightly engaged into the slot 122 or fixed by gluing, welding, screwing, etc. For example, the shaft 52 is screwed into the plate member 1220.

[0081] At least one elastic restraint member 7 cooperates with the bracket 5, in Figure 6Aand 6B In [description of Figure 219], the elastic member 7 is installed in each slot 122. However, a device with a single elastic restraint member 7 can be adopted. According to one embodiment, each member 7 is in the form of a helical compression spring, installed around the corresponding guide shaft 52, with one side abutted against the plate 1220 and the other side located on the bracket 5. Thus, the spring 7 is perfectly held in place. However, other types of elastic members can also be provided, such as leaf springs or elastomeric blocks. The elastic restraint member 7 is arranged to push the bracket 5 back upward (along the Z-Z direction).

[0082] When the button 6 is in the rest state ( Figure 6A , 7A ), that is, when it is not triggered, the elastic member 7 restrains the bracket 5 such that the locking block 50 passes through the slot 40 and its movable part 501 engages into the notch 43. Its upper end 500 contacts the face 61 of the button 6. In this position, since the locking block 50 is locked into the notch 43, the slider 4 is locked in place and cannot translate along the adjustment direction X-X. In other words, since the notch 43 is in the form of a counterbore and its shape is complementary to the shape of the movable part 501, the engagement of the movable part into the notch locks the translational degree of freedom of the slider 4 in the guiding direction. Thus, all risks of accidental translation of the slider 4 are eliminated.

[0083] When the button 6 is triggered, that is, when the button is operated along the Z-Z direction (as indicated by the arrows in Figure 6B and 7B ), it will push the locking block 50 back along its longitudinal axis, driving the bracket 5 and compressing the elastic member 7. Thus, the locking block 50 ensures the first technical function of acting as a stop member to push the bracket 5 back. The locking block 50 is pushed back to a position where it is released from the notch 43, especially its movable part 501. However, the upper end 500 of the locking block 50 still engages into the slot 40. However, when the locking block 50 and the slot 40 are installed to slide relative to each other, the slider 4 can freely slide relative to the locking block to the expected adjustment length of the wristband (for example, a length adjustment corresponding to the distance between two notches). Thus, the locking block 50 ensures the second technical function of guiding the translation of the slider 4. The sliding of the slider 4 is indicated by the double arrows in Figure 7B .

[0084] When the locking block 50 has the shape as shown in Figure 4B , its flat side allows preventing the lateral movement of the slider 4 and ensures part of the function of the above-mentioned first slideway 121. This first slideway can then be omitted or can be more simply configured to only prevent the lateral movement of the slider 4.

[0085] When the desired adjustment position is reached, release the button 6. The elastic member 7 then restrains the bracket 5 so that the locking block 50 translates along its longitudinal axis Z-Z and returns to the position locked in the notch 43, and locks the slider 4 in place. Thus, the locking block 50 ensures the third technical function as the locking member for the slider 4.

[0086] The buckle further has a locking device which allows the locking buckle 1 to be held in the closed position. The locking device is operationally independent of the above-mentioned length adjustment device of the wristband. In other words, the locking device operates independently of the adjustment device, and vice versa. Therefore, the locking device can be used for buckles with any other type of adjustment device or buckles without an adjustment device.

[0087] In Figure 8A and Figure 8B , the locking device 8 is arranged in the recess 1110 which is provided at the center of one end 111 of the second sheet 11. Referring to Figure 8C , the recess 1110 is penetrated by two coaxial lateral counterbores 1111 and a longitudinal counterbore 1112 located at the front of the recess. The recess 1110 is further penetrated by a blind hole 1113 which is coaxial with the longitudinal counterbore 1112 and is located at the rear of the recess.

[0088] Referring to Figure 8A , 8B , 9A and 9B, the closing device 8 has a lock 80 connected to the actuating member 81. The lock 80 is in the form of a pin, for example. It is received in the longitudinal counterbore 1112. In the locked extended position ( Figure 8A , 9A ), one of its ends 800 projects from the front face of the second sheet 11. According to one embodiment, the other end of the lock 80 extends into the blind hole 1113 in which a spring 11130 is installed, and the spring holds the lock in the locked position.

[0089] The actuating member 81 has two sliding rollers 810 which are rotatably mounted along an axis (Z-Z) perpendicular to the longitudinal axis (X-X) of the lock 80. The rollers 810 are symmetrically arranged with respect to the longitudinal axis of the lock 80.

[0090] The locking device 8 further has two buttons 82, each button being installed in one of the side counterbores 1111. Each button 82 has a longitudinal axis (Y-Y) which is perpendicular to the longitudinal axis (X-X) of the lock 80 and the rotation axis of the roller 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, the end 820 has an inclined plate or a conical surface which is in inclined contact (preferably 45°±5°) with the roller 810. The other end of the button 82 is located at the end of the recess 1110 and has a pressing area 821 which can be triggered by the user.

[0091] According to one embodiment, button 82 also passes through a coaxial side counterbore 1211 formed in the cover plate 12 described above, particularly visible in Figure 2A and Figure 2B Thus, button 82 allows the cover plate 12 to be connected to the sheet 11. The cover plate 12 also covers the locking device 8, making it invisible and inaccessible to the user.

[0092] Figure 9A and 9B show the locking and unlocking of the locking device 8. When the user does not trigger button 82 ( Figure 9A ), spring 11130 pushes the lock 80 back to the locked extended position. Its end 800 then engages with one end 101 of the first sheet 10, which advantageously has a leading edge that meshes with the end 800. In this locked position, the locking latch 1 is closed, and the sheets 10, 11 remain folded and superimposed.

[0093] When the user ( Figure 9B ) triggers button 82 by gently pressing area 821, end 820 abuts against roller 810 to push the actuating member 81 back, while also driving the lock 80 along. The latter retracts to the unlocked retracted position by compressing spring 11130 until its end 800 disengages from the end 101 of the first sheet 10. In this unlocked position, the locking latch 1 opens, and the sheets 10, 11 pivot freely at their ends 100, 110 to open the wristband.

[0094] The main advantage of using roller 820 is that the friction between end 820 and the actuating member 81 is almost zero, resulting in minimal force required for unlocking and minimal wear. Thus, the maintenance, replacement, or repair procedures for the locking device 8 are greatly reduced.

[0095] According to Figure 10A 、 10B 、11A and 11B, in the illustrated embodiment, the second sheet 11 is composed of two parts 11a, 11b that are slidably mounted relative to each other, such that the second sheet has the ability to telescopically expand. According to one embodiment, part 11a, which is integral with the cover plate 12, has a slideway adapted to receive the second part 11b, and the slideway extends in the adjustment direction of the watch wristband.

[0096] In Figure 10A and 10B , both parts 11a, 11b are in the folded position, where part 11a retracts into part 11b. This is the position where the sheets 10, 11 can be superimposed so that the locking latch 1 can be closed.

[0097] In Figure 10A and 10BIn this case, both parts 11a and 11b are in the deployed position, in which part 11a slides outside part 11b, increasing the length of the sheet 11. This ability to telescopically deploy is particularly beneficial to the user. It allows the sheet 11 to expand, which is useful for wrapping the wristband around the user's hand, which is typically wider than the wrist. Once the wristband has passed, the sheet 11 can contract to fit precisely around the wrist. This not only improves comfort and ease of use, but also extends the applicability of the buckle to a wider range of hand and wrist sizes.

[0098] In the above embodiments, the setting of each component and / or device and / or step in the present invention should not be construed as requiring such a setting in all implementations. In any case, it can be understood that various improvements can be made to the components and / or devices and / or steps without departing from the spirit and scope of the present invention.

[0099] In addition, one or more features described in only one embodiment can be combined with one or more other features described in only another embodiment. Similarly, one or more features described in only one embodiment can be extended to other embodiments, even if such feature or features are only described in combination with other features.

Claims

1. A watch wristband lock having: - a locking clasp (1) formed by hinged sheets (10, 11) and a cover plate (12) which overlap each other when the clasp is in the closed position, - a wrist strap length adjustment device, mounted in the cover plate (12), It is characterized in that The regulating device comprises: a slide (4) which is restrained in the cover plate (12) and has a guide slot (40) extending in the adjustment direction (XX), in which a countersunk positioning recess (43) is arranged, - a support (5) carrying at least one locking block (50) passing through the slot (40) and configured to engage in the recess (43), the locking block and the slot being mounted so as to slide relative to each other, the locking block having an upper end (500) and a lower end (501) defining a longitudinal axis (ZZ) perpendicular to the guide direction (XX), the locking block also having a movable portion (501) having a shape complementary to that of the recess (43), - at least one elastic constraining member (7) cooperating with said support (5), - a triggerable button (6) arranged in the cover plate (12), the button having a contact surface (61) in contact with the upper end (500) of the locking block (50), in: - triggering the button (6) pushes the locking block (50) to translate along its longitudinal axis (ZZ) to a position where the movable portion (501) is released from the recess (43), thereby enabling the slider (4) to slide relative to the locking block to a desired adjustment position, -When the button (6) is released, the elastic member (7) constrains the bracket (5) so that the locking block (50) translates along its longitudinal axis and returns to the position where the movable part (501) is locked in the recess (43), and locks the slider (4) in place. The engagement of the movable part in the recess locks the translational freedom of the slider (4) in the guide direction (XX).

2. The lock buckle according to claim 1, wherein the slider (4) is movably mounted in a first slideway (121) arranged in the cover plate (12), and the first slideway extends along the adjustment direction (XX).

3. A lock according to any one of the above claims, wherein the bracket (5) is movably installed and can translate in a second slide (122) provided in the cover plate (12), and the second slide extends along the height of the cover plate in a direction perpendicular to the adjustment direction (XX).

4. The lock buckle according to claim 3, wherein the bracket (5) has two ends (51), each end having a hole (510) for accommodating a guide shaft (52) to guide the bracket to translate in the second slideway (122).

5. The lock buckle according to claim 4, wherein: - the second slideway (122) has two slots into which the end (51) of the bracket (5) is inserted, - an elastic restraining member (7) is installed in each of said slots, - Each of the restraining members (7) is in the form of a helical closing spring, mounted around the corresponding guide shaft (52), with one side resting on the closing plate (1220) of the corresponding slot and the other side resting on the bracket (5).

6. The lock buckle according to any one of the preceding claims, wherein a thin sheet (11) consists of two parts (11a, 11b) slidably mounted relative to each other, so that the thin sheet has the ability to be telescopic and unfolded.

7. The lock according to any one of the above claims, further comprising a locking device (8) for holding the locking buckle (1) in a closed position, the locking device comprising: - a lock (80), held in a locked extended position by a spring (11130), - an actuating member (81), connected to the lock (80) and provided with a sliding roller (810), - a button (82), the end (820) of which is in contact with the roller (810), so that when the button is pressed, the end abuts against the roller, thereby pushing back the actuating member (81), driving the lock (80) therewith to the unlocked retracted position.

8. The lock buckle according to any one of the preceding claims, wherein the movable portion (501) is in the form of a flange, defining the lower end of the locking block (50).

9. An adjustable watch wristband, comprising: - a first section (2) and a second section (3), said sections being constituted by articulated links (20, 30); -Lock, It is characterized in that The lock buckle meets one of the above characteristics, and wherein: - one end of the first section (2) is connected to one of the chain links (10), - One end of the second section (3) is connected to a slider (4).

10. A watch with an adjustable wristband, characterized in that: The wristband complies with claim 9.

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