Device for adjusting length of bracelet

Abstract

To further improve the adjustability of the length of a bracelet.SOLUTION: A device for adjusting the length of a bracelet includes: a cover; an adjusting link element 40 designed to be connected to a bracelet strand 9 and mounted to be movable relative to the cover in a longitudinal direction in which the bracelet strand to be connected to the adjusting link element 40 extends, such that displacement of the adjusting link element 40 relative to the cover enables increase or decrease in the length of the bracelet strand; an actuating device 30 arranged on the cover to be movable relative to the cover in at least the longitudinal direction; and a first kinematic connection connecting the actuating device 30 and the adjusting link element 40, such that the actuation of the actuating device 30 in at least the longitudinal direction relative to the cover can bring about the longitudinal displacement of the adjusting link element 40 relative to the cover.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a device for adjusting the length of a bracelet, and more particularly to a bracelet suitable for a wristwatch having a deployment clasp provided between two ends of the bracelet. The present invention also relates to a clasp and the bracelet itself that employ a device for adjusting the length of the bracelet as described above, and to a small watch, such as a wristwatch itself, that includes a device as described above.

Background Art

[0002] A deployment clasp provided for fastening two chains of a watch bracelet around the wearer's wrist based on the prior art includes a plurality of articulated blades that can occupy a first, closed position in which the blades are folded so that they overlap each other, and a second, open position in which each blade is deployed without overlapping, enabling the watch to be worn and removed. Such a clasp generally has means for adjusting the length of the bracelet and / or the bracelet chain.

[0003] Therefore, existing clasps have solutions that allow the length of the bracelet to be adjusted once or multiple times. As an example, Patent Documents 1, 2, and 3 disclose solutions for adjusting the length of a bracelet, in which the adjustment link element of the bracelet is displaceable with respect to the cover of the bracelet's clasp. These existing solutions generally require a specific operation in which the user appropriately positions the movable element when adjusting the length of the bracelet.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

[0005] The general objective of the present invention is to further improve the adjustability of the bracelet length.

[0006] More specifically, the object of the present invention is to propose a solution for adjusting the length of a bracelet that is reliable in operation and intuitive and convenient to use. The advantages of the present invention, as shown below, stem in particular from the fact that it can be adjusted without the need to remove the watch from the wrist.

[0007] In addition, an object of the present invention is to propose a solution for adjusting the length of a bracelet, which is optimally integrated with the bracelet or clasp to which it is attached, particularly for aesthetic purposes. [Means for solving the problem]

[0008] Therefore, the present invention is based on a device for adjusting the length of a bracelet, wherein the adjustment link element is mounted longitudinally to a cover so as to drive one end of the bracelet chain to extend or shorten the bracelet, and the adjustment link element is mounted longitudinally to the surface of the cover and is displaced by the operation of an actuator connected for the adjustment link via a first kinematic coupling.

[0009] The present invention is defined in more detail by the claims.

[0010] These objects, features, and advantages of the present invention are disclosed in more detail in the non-limiting description of the following specific embodiments with reference to the accompanying drawings. [Brief explanation of the drawing]

[0011] [Figure 1]Figure 1 is a perspective view of a clasp incorporating a device for adjusting the length of a bracelet, according to a first embodiment of the present invention. [Figure 2] Figure 2 is an exploded perspective view of a clasp cover incorporating a device for adjusting the length of a bracelet, according to a first embodiment of the present invention. [Figure 3] Figure 3 is a cross-sectional view through the vertical longitudinal plane of a clasp cover incorporating a device for adjusting the length of a stationary bracelet, according to a first embodiment of the present invention. [Figure 4] Figure 4 is a cross-sectional view through the vertical longitudinal plane of a clasp cover incorporating a device for adjusting the length of a bracelet, according to a first embodiment of the present invention, showing the operating device in a pressed state. [Figure 5] Figure 5 is a cross-sectional perspective view through the vertical longitudinal plane of a clasp cover incorporating a device for adjusting the length of a bracelet, according to a first embodiment of the present invention, and shows one of several configurations in the adjustment process. [Figure 6] Figure 6 is a cross-sectional perspective view through the vertical longitudinal plane of a clasp cover incorporating a device for adjusting the length of a bracelet, according to a first embodiment of the present invention, and shows one of several configurations in the adjustment process. [Figure 7] Figure 7 is a cross-sectional perspective view through the vertical longitudinal plane of a clasp cover incorporating a device for adjusting the length of a bracelet, according to a first embodiment of the present invention, and shows one of several configurations in the adjustment process. [Figure 8] Figure 8 is a cross-sectional perspective view through the vertical longitudinal plane of a clasp cover incorporating a device for adjusting the length of a bracelet, according to a first embodiment of the present invention, and shows one of several configurations in the adjustment process. [Figure 9] Figure 9 is a cross-sectional perspective view through the vertical longitudinal plane of a clasp cover incorporating a device for adjusting the length of a bracelet, according to a first embodiment of the present invention, and shows one of several configurations in the adjustment process. [Figure 10]Figure 10 is an exploded perspective view of a clasp cover incorporating a device for adjusting the length of a bracelet according to the second embodiment of the present invention. [Figure 11] Figure 11 is a partial perspective view of a clasp cover incorporating a device for adjusting the length of a bracelet according to the second embodiment of the present invention. [Figure 12] Figure 12 is a top view of a clasp cover incorporating a device for adjusting the length of a bracelet according to the second embodiment of the present invention, showing one of a plurality of configurations during the adjustment process. [Figure 13] Figure 13 is a top view of a clasp cover incorporating a device for adjusting the length of a bracelet according to the second embodiment of the present invention, showing one of a plurality of configurations during the adjustment process. [Figure 14] Figure 14 is a top view of a clasp cover incorporating a device for adjusting the length of a bracelet according to the second embodiment of the present invention, showing one of a plurality of configurations during the adjustment process. [Figure 15] Figure 15 is a top view of a clasp cover incorporating a device for adjusting the length of a bracelet according to the second embodiment of the present invention, showing one of a plurality of configurations during the adjustment process. [Figure 16] Figure 16 is a top view of a clasp cover incorporating a device for adjusting the length of a bracelet according to the second embodiment of the present invention, showing one of a plurality of configurations during the adjustment process. [Figure 17] Figure 17 is a top view of a clasp cover incorporating a device for adjusting the length of a bracelet according to the second embodiment of the present invention, showing one of a plurality of configurations during the adjustment process.

Embodiments for Carrying Out the Invention

[0012] For the sake of simplicity in the following description, the "longitudinal direction" is defined and used in relation to the length of the bracelet or bracelet chain. This definition is also interpreted for the adjusting device and the clasp itself, taking into account the longitudinal direction of the bracelet chain to which the adjusting device or the clasp is connected.

[0013] In addition, the adjective "upper" is defined and used to refer to the surface or any part that is intended to continue to be disposed away from the user's arm when the bracelet is worn. For example, the upper surface of the clasp cover is the surface that can be seen by the user, away from the surface that is disposed toward and hidden from the arm when the clasp is closed against the arm.

[0014] The "vertical direction" is defined as the direction perpendicular to the longitudinal direction, from the region intended to contact the user's arm toward the region on the opposite side. Therefore, as will be clear from the following description, the direction is perpendicular or substantially perpendicular to, for example, the upper surface of the cover.

[0015] Finally, the "lateral direction" is defined as the direction perpendicular to the two directions of the longitudinal direction and the vertical direction.

[0016] For simplicity of explanation, the same reference numerals in the two embodiments described below are used to indicate the same parts, or similar or equivalent parts.

[0017] An apparatus for adjusting the length of a bracelet according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

[0018] According to this embodiment, the device for adjusting the length of the bracelet is located within a clasp 1 that includes two interconnected blades 2 and 3. Thus, the two ends of the second blade 3 are connected to the first blade 2 and the first part 4 of the cover 10 via a first rotating pin 5 and a second rotating pin 6, respectively. The first blade 2 includes a device located at the end opposite to the connection of the second blade 3 for securing it to the first bracelet chain 7 and the second part of the cover 8. The cover 10 includes the device for adjusting the length of the bracelet, which is detailed below. By known methods, the clasp 1 can occupy a closed structure in which the two blades are folded and locked in that position, particularly via the cover, allowing the bracelet to be worn by the user, and an open structure in which the blades are unfolded, allowing the bracelet to be removed from the wrist. Figure 1 shows the clasp in an intermediate position during unfolding.

[0019] Figure 2 is an exploded perspective view showing in more detail a device for adjusting the length of a bracelet according to the first embodiment. More specifically, the adjustment device is located within the cover 10 of the clasp 1.

[0020] The cover 10 includes a body 11, which includes two side portions symmetrical with respect to a vertical longitudinal midline. Each side portion includes a top portion 12 and a side wall 13 substantially perpendicular to the top portion 12. Longitudinal grooves 14 are located on the inner surfaces of each side wall 13. Indexing and locking elements 15, which preferably take the form of a toothed row having a rectangular cross-sectional shape, are additionally located within these grooves 14. The toothed row extends into the vertical longitudinal plane. At an intermediate height or practically midway, an intermediate base 16 connects the two side portions of the cover 10. The intermediate base 16 takes the form of a transverse plate including a central opening 17.

[0021] The device for adjusting the length of the bracelet includes an actuator 30 connected to an adjustment link element 40 via a first kinematic link.

[0022] The actuator 30 takes the shape of a surface that is longitudinally movable relative to the cover 10. This surface is positioned on the upper surface of the cover 10 to complement the upper portion 12, thereby forming a substantially continuous surface having an appearance similar to other conventionally known fasteners.

[0023] The adjustment link element 40 includes two side caps 41, each positioned in each longitudinal groove 14 of the cover 10, to allow longitudinal displacement of the adjustment link element 40 relative to the cover. In this embodiment, these two caps 41 are each positioned at the two ends of the transverse rod 42. The adjustment link element 40 additionally includes a fastener for the bracelet chain. In this embodiment, the fastener takes the form of a pin 43, around which the first link element of the second bracelet chain 9 is attached. The adjustment link element 40 additionally includes at least one drive stopper 46, intended to allow it to be driven longitudinally. In this embodiment, it includes two substantially perpendicular drive stoppers 46. Thus, its longitudinal displacement allows the adjustment link element 40 to drive the second bracelet chain 9 in that longitudinal direction, thereby allowing adjustment of the length of the second bracelet chain 9 and, more generally, the length of the bracelet.

[0024] The first kinematic linkage allows the actuator 30 to be connected to the adjustment link element 40, thereby enabling the adjustment link element 40 to be driven by the operation of the actuator 30. This operation will be described in detail below.

[0025] The first kinematic linkage includes a first elastic return element 50, which takes the form of a first specific spring provided between the lower surface of the actuator 30 and the base 16 of the cover 10. In this embodiment, the first spring is designed to exert multiple elastic return forces of the actuator 30 in both longitudinal directions and vertical directions. To this end, the first spring takes the form of a spring that has been cut and enclosed in a central portion by two projections 18 formed on the base 16 of the cover 10. The first spring includes a central opening 52 that substantially overlaps the central opening 17 of the base 16. The first spring further includes two circularly curved elastic portions 53 having a smaller cross-section than the cross-section of the spring body, thereby performing the return function in the various directions described above. Furthermore, the first spring further includes two other extended curved flexible portions 54 that similarly contribute to the vertical elastic return of the actuator 30. The first elastic return element 50 more specifically allows the actuator 30 to return and hold to its resting position, preferably aligned in the center of the base 16, and more generally, relative to the cover 10. The first kinematic coupling additionally includes a rack 100 in the form of a flat plate, which includes a return-stopping system in the form of holes 106 evenly spaced longitudinally, and two drive return stops 46. In this embodiment, the return-stopping system includes two parallel, continuous holes 106 arranged corresponding to the spacing between the two drive return stops 46. At two longitudinal ends, the rack 100 includes upward-sloping portions 107 substantially perpendicular to the rack, which rise toward the actuator 30 so as to be fixed to the corresponding coupling portions 37 of the actuator. This coupling has the effect that the rack 100 is longitudinally movable in conjunction with the movement of the actuator 30.

[0026] In this embodiment, the device for adjusting the length of the bracelet may additionally include a locking device which comprises two configurations. The two configurations are a first locking configuration which acts on the adjustment link element 40 to prevent displacement relative to the cover 10, and a release configuration which releases the adjustment link element 40, thereby making it movable relative to the cover 10, for the purpose of enabling adjustment. In this embodiment, the locking device is realized by locking return stops 44, preferably having a rectangular cross-sectional shape, which are positioned at each of the two ends of the transverse rod 42 of the adjustment link element, and the locking return stops 44 are designed to cooperate with an indexing and locking element 15 located in a longitudinal groove 14. The rod 42 may advantageously take the shape of a spring bar. In this embodiment, the locking device is actuated by an actuator 30.

[0027] The locking device further includes a second kinematic link that connects the actuator 30 to the locking device, thereby enabling locking and unlocking via the operation of the actuator 30. The second kinematic link includes an intermediate element 60 and a second elastic return element 70 in the form of a planar or substantially planar spring plate, which is intended to deform over its entire width, particularly by changing its convex shape. The spring bar forming the rod 42 elastically returns to the intermediate element 60 by the spring plate, positioning the locking device in its locking configuration by positioning a locking deactivation stopper 44 between the two indexing and locking elements 15. The intermediate element 60 in the form of a push button is similarly displaceable in the vertical direction. The intermediate element 60 is intended to act on the second elastic return element 70 to displace the spring bar downward, thereby releasing the locking deactivation stopper 44 of the indexing and locking elements 15 (Figure 6).

[0028] The operation of the device for adjusting the length of this bracelet will be explained with reference to Figures 3 through 10.

[0029] Figures 3 and 4 are cross-sectional views of a device for adjusting the length of a bracelet, passing through the vertical longitudinal median plane.

[0030] Figure 3 shows the adjustment device in a stationary position in the locking configuration. The element's locking stopper 44 is located between the two indexing and locking elements 15, and the drive stopper 46 is disengaged from the hole 106 in the rack 100. Figure 4 shows the adjustment device in the disengaged configuration. It can be seen that the actuator 30 is actuated by a downward vertical pressure through simple central contact with its upper surface 31. This pressure has the effect of compressing the first spring that forms the first elastic return element 50 against the base 16. This actuate the rack 100's stopper system with the drive stopper 46. More specifically, these drive stoppers 46 are located within the hole 106 of the rack 100. Simultaneously, the rack 100 transmits contact to the intermediate element 60, which in turn transmits contact to the rod 42, thereby displacing the rod 42 downwards in contact with the second elastic return element 70, causing the second elastic return element 70 to deform. The rod 42 is displaced vertically so that its locking stopper 44 disengages from the indexing and locking element 15. In this way, the adjustment link element 40 is no longer locked and becomes operable to displace longitudinally. The adjustment device then takes on a disengaged configuration.

[0031] To ensure a clear understanding of how the adjustment mechanism works, the process of shortening the bracelet will be explained while referring to Figures 5 to 9, which show cross-sectional perspective views illustrating the various configurations of the adjustment mechanism that shortens the bracelet.

[0032] Figure 5 shows the adjustment device in a stationary state, with the same configuration as Figure 3 described above. It can be seen that the rack 100 is not engaged with the drive return stopper 46 of the adjustment link element 40. In addition, the locking return stopper 44 is engaged with the indexing and locking element 15, locking the adjustment link element 40 in its longitudinal position, thereby locking the device for adjusting the length of the bracelet. The first elastic return element 50 stably holds the actuator 30 in its stationary position, so this stationary position is stable.

[0033] Figure 6 shows an intermediate adjustment position in which the device for adjusting the length of the bracelet is in its unlocked configuration, similar to the position shown in Figure 4. In this configuration, the actuator 30 is driven downward, as described with respect to Figure 4.

[0034] Figure 7 illustrates the process of adjusting the length of the bracelet to shorten it. A downward vertical pressure is maintained on the actuator 30, causing the actuator 30 to displace longitudinally, to the left in Figure 7. These actions drive the adjustment link element 40 to undergo the same longitudinal displacement via the first kinematic linkage.

[0035] Advantageously, the longitudinal movement of the actuator 30 is restricted by one or more restraints. In this embodiment, the movement is defined by the length of the central opening 17 of the base 16, which forms a restraint against the displacement of the projection 33 of the actuator 30. The maximum longitudinal movement of the actuator 30 is advantageously provided such that the adjustment link element 40 can slide by one or several pitches corresponding to the pitch between two consecutive indexing and locking elements 15. This allows the bracelet length adjustment to correspond to the linear or continuous linear movement of the actuator 30 from its resting position to reaching the longitudinal restraint. In addition, preferably, the pitch of the rack 100, in other words, the pitch between the two holes 106, is the same as the pitch between the two indexing and locking elements 15. This arrangement is designed so that the drive restraint 46 always faces the holes 106 of the rack 100 when the locking restraint 44 faces the casing provided for the indexing and locking elements 15.

[0036] After length adjustment, the user releases pressure on the actuator 30. Due to the double elastic return of the two elastic return elements 50 and 70, the actuator 30 and each element of the first and second kinematic links rise vertically. The locking return stopper 44 of the adjustment link element also rises similarly due to the effect of the rising of the rod 42 and is housed between the two indexing and locking elements 15. Note that with this new configuration, the rack 100 is in its apex position and outside the range of the drive return stopper 46 of the adjustment link element 40. Figure 8 shows the device in this configuration.

[0037] Finally, the user completely releases the actuator 30, thereby returning it to its initial resting position by the return force provided by the first elastic return element 50, i.e., the first spring. In particular, in addition to its rise as described with respect to Figure 8, the actuator 30 further takes on a resting position in the longitudinal direction, preferably in the center, by the elastic return of the first spring in both the vertical and longitudinal directions. Figure 9 shows this resting configuration.

[0038] The adjustment, which involves increasing the usable length of the bracelet, can of course be performed in a similar manner by displacing the actuator 30 to the opposite side in the longitudinal direction, i.e., to the right in Figures 5 through 9.

[0039] Note that the adjustment link element 40 abuts against the groove 14 within the cover 10 when it reaches its end position, and is displaceable only in one direction along the longitudinal direction.

[0040] It should also be noted that the same configuration allows for adjustment of the usable length of the bracelet, which is initiated by sliding the actuator 30 longitudinally, then by applying vertical pressure to disengage the device and engage the adjustment link element, and then maintain this contact until the actuator returns to its initial position. As a result, the adjustment link element is translated as the actuator returns to its initial position.

[0041] In one modified embodiment, the actuator may be designed to be movable by two displacements, longitudinal and lateral, instead of the longitudinal and vertical movement in the above-described embodiment. The first kinematic linkage is modified for such implementation.

[0042] In general, in other modifications of the embodiment, the first and second kinematic connections may differ from those exemplified.

[0043] Figures 10 to 17 show a device for adjusting the length of a bracelet according to the second embodiment. This adjustment device is also located within the clasp 1, as shown in Figure 1.

[0044] To simplify the explanation, the main differences from the first embodiment will first be shown in detail based on Figures 10 and 11.

[0045] Firstly, the actuator 30 is movable only in the bidirectional longitudinal direction and not in the vertical or lateral directions. Therefore, the actuator is movable in only one direction, not in two directions as in the first embodiment. Thus, the device for adjusting the length of the bracelet differs from the first embodiment in that the displacement of the actuator 30 only in the longitudinal direction sufficiently transmits the two functions of adjusting the length of the bracelet: unlocking the adjustment link element 40 and the longitudinal displacement of the adjustment link element 40.

[0046] The first kinematic connection includes a first elastic element 50 comprising two coil springs arranged longitudinally within an opening in the base 16, the first end of which is fixed to the base 16 and the second end of which is supported by a lower projection 32 of the actuator 30. This configuration means that the two coil springs exert a return force on the actuator in both longitudinal directions, thereby allowing the actuator to return to a central resting position relative to the cover 10.

[0047] The first kinematic linkage further includes a conversion element 80 positioned on the underside of the actuator 30 so as to be fixed longitudinally to the actuator but movable laterally, and an element, hereafter simply referred to as the first cam surface 110, which is fixed to the actuator 30 and positioned below the conversion element 80 to form a cam surface.

[0048] The conversion element 80 includes a guide shape 82 positioned on its side, intended to cooperate with a second cam surface 19 formed on the lateral side of the central opening 17 of the base 16 in the transversely elongated surface where the base 16 is positioned. The second cam surface 19 of the base 16 includes a laterally extending projection, in particular, to allow the conversion element 80 to be guided laterally. A third spring 120 acts on the conversion element 80, holding the guide shape 82 of the conversion element 80 relative to the second cam surface 19 of the base 16 via a laterally elastic spring force. In the illustrated embodiment, this third spring 120 takes the form of a wire spring supported by a projection fixed to the moving device 30.

[0049] Thus, the lateral position of the conversion element 80 is determined by the second cam surface 19 of the base 16, depending on the longitudinal position of the actuator 30 relative to the base 16 of the cover body 11.

[0050] The conversion element 80 additionally includes a guide element 86, which is positioned below its lower surface and intended to cooperate with the drive return stop 46. The difference from the first embodiment is that the drive return stop 46 is not positioned directly on the adjustment link element, but rather on the upper surface of an intermediate element 60 located within the adjustment link element 40. A locking return stop 44 is similarly positioned on the upper surface of the intermediate element. In addition, the first cam surface 110 similarly includes an outline with a projection 112 located within the central opening 117, which is capable of cooperating with the drive return stop 46 of the intermediate element 60.

[0051] Finally, the base 16, the first elastic return element 50, the conversion element 80, and the third spring 120 are sandwiched between the actuator 30 and the first cam surface 110. This arrangement allows these elements to be maintained as a connected assembly on the clasp cover.

[0052] The intermediate element 60 is positioned laterally within the casing 47 of the adjustment link element 40 so as to be movable laterally. In this embodiment, the second elastic return element 70, which is a coil spring, acts to cause the intermediate element 60 to elastically return laterally to its resting position, and thus acts on both the locking stopper 44 and the drive stopper 46.

[0053] Similarly, the adjustment link element 40 includes a transverse rod 42 with caps 41 at both ends, and the caps slide within longitudinal grooves 14 located in the side walls 13 of the cover, thereby guiding the longitudinal displacement of the adjustment link element 40 when the length of the bracelet is adjusted.

[0054] As will be explained in detail below, the first kinematic linkage thus forms a motion conversion device that enables the linear motion of the actuator 30 in the longitudinal direction to be converted into continuous motion within the device for adjusting the length of the bracelet.

[0055] The second kinematic linkage enables the locking function via the actuator 30. Unlike the first embodiment, the locking function is ensured via indexing and locking elements 15 located on the side of the base 16 rather than within the longitudinal groove 14. These indexing and locking elements 15 are positioned on the transverse longitudinal surface in which the base 16 is placed. These indexing and locking elements 15 cooperate with one or more locking return elements 44 as described above.

[0056] Figures 12 to 17 show in more detail the operation of the device for adjusting the length of a bracelet according to this second embodiment, in top views that emphasize each element of the kinematic linkage to more clearly illustrate the operation.

[0057] Figure 12 shows a device for adjusting the length of a bracelet, stationary in an intermediate bracelet length adjustment position. The drive stopper 46 is separated from the first cam surface 110 and the drive shape of the conversion element 80. The intermediate element 60 is additionally positioned so that its locking stopper 44 engages with the indexing and locking element 15, and is locked in that position.

[0058] To adjust the bracelet length, the user operates the actuator 30 by displacing it longitudinally, to the left in the selected example, as shown in Figures 12 through 17. This operation displaces the conversion element 80 until the guide element 86 engages with the drive stopper 46 of the intermediate element 60, as shown in Figure 13. Simultaneously, the guide shape 82 of the conversion element 80 contacts the projection of the second cam surface 19 of the base 16. The intermediate configuration is shown in Figure 13.

[0059] As the movement of this actuator 30 continues, the cooperation of the guide shape 82 of the conversion element 80 and the protrusion of the second cam surface 19 results in a lateral displacement of the conversion element 80. This movement, in cooperation with the guide element 86 and the drive return stop 46 of the intermediate element 60, drives the intermediate element 60 to the same lateral displacement. This displacement of the intermediate element 60 causes the locking return stop 44 to separate from the indexing and locking element 15 which is positioned laterally at the base 16. This new intermediate configuration is shown in Figure 14.

[0060] The longitudinal displacement of the actuator 30 continues until it reaches a stop, the maximum movement of which is predetermined depending on the assembly of the device. This movement corresponds to the pitch of the indexing and locking elements 15. Simultaneously, the guide shape 82 of the conversion element 80 crosses a projection of the second cam surface 19, and the conversion element 80 is displaced laterally on the opposite side by another projection of the second cam surface 19 cooperating with the guide shape 82 on the opposite side of the conversion element 80, and under the influence of the second elastic return element 70 and the third spring 120. Note that the longitudinal stop in this overall displacement is realized between the guide shape 82 of the conversion element 80 and the cam surface 110. This displacement causes the locking return stop 44 to reposition the indexing and locking elements 15 to a new return stop, thereby re-locking the intermediate element 60, and indirectly the adjustment link element, in this new position, corresponding to shortening the length of the bracelet, more specifically the second chain of the bracelet. This configuration is shown in Figure 15.

[0061] Subsequently, the user releases the actuator 30, and the actuator 30 automatically returns to its resting position due to the elastic return of the first elastic return element 50. Figure 16 shows the intermediate position of the actuator 30 during the return displacement. In this intermediate configuration, the guide shape 82 of the conversion element 80 returns to a state in contact with the protrusion of the second cam surface 19. This return guidance drives the drive return stopper 46 laterally, thereby releasing the engagement of the drive return stopper 46 of the intermediate element 60. This movement continues until the actuator 30 returns to its resting position, as shown in Figure 17.

[0062] Note that this new position, shown in Figure 17, corresponds to the maximum reduction in the usable length of the bracelet. As a result, even if the actuator is pushed in the direction of further reduction, the first kinematic link simply does not allow the adjustment link element to be driven any further.

[0063] The extension of the bracelet is achieved in a similar manner by driving the actuator 30 to the opposite side in the longitudinal direction (to the right in Figures 12 to 17).

[0064] Of course, the present invention is not limited to the two embodiments described above. Various modifications of the embodiments can be devised from the two embodiments described above.

[0065] In the advantageous implementation described, the actuator is incorporated evenly and continuously into the upper surface of the cover. In its resting position, the actuator is preferably located in the center of the upper surface of the cover and / or forms the central portion of the cover. The actuator advantageously extends along the entire length of the cover. This upper surface thus forms a continuous surface of the cover substantially parallel to the upper surface of the bracelet chain fixed to the adjustment link element. Of course, as a variation, the actuator can take any form in which it is located on the upper surface of the cover.

[0066] As a variation, the actuator can be positioned on the side of the cover instead of the top surface, and its movement can still be in the longitudinal direction and optionally in another direction.

[0067] In another modification of the embodiment, the adjustment device does not include a locking device, and the locking device may be optional. This is because the actuator and / or first kinematic coupling can adequately reduce the risk of unintentional changes in length adjustment without a locking device. In a modification, the movement of the actuator can be locked by a safety device. This safety device may be the same as one that prevents unintentional release of a latch.

[0068] In another modification, the locking device may be actuated by a second actuator, a locking / unlocking element, separate from the first actuator, thereby enabling length adjustment to be performed independently, instead of simultaneously with the first actuator as in the embodiments described above. This second actuator can transmit a different movement, particularly in a different direction, than that of the first actuator. In further modifications, the locking device may include any form of locking element and does not have to be the detent system described, but may be, for example, a simple friction brake system.

[0069] The adjustment device was described as having two or three elastic return elements. Of course, different numbers of elastic return elements are also possible.

[0070] In addition, the adjustment mechanism was described as being incorporated into the clasp cover. As a variation, the adjustment mechanism may be incorporated into any cover, not just the clasp cover. This cover may take any form, and may be very simple.

[0071] Up to this point, the adjustable link element has been described as an element independent of the bracelet, including a fastening device for the bracelet chain, particularly a device that fastens in a connected manner. In variations, this fastening may differ, such as having no degrees of freedom. According to further variations, the adjustable link element may be fully integrated into the bracelet chain. The adjustable link element may form a single part with the bracelet chain. In other words, to encompass all these implementations as a whole, the adjustable link element is recognized as being designed to be connected to the bracelet chain.

[0072] The adjustment device can be located, for example, in the miniature watch case, fastening means, end links, bracelet link elements or chains, or on protrusions of the case body or case bottom. More generally, the adjustment device can be located in any element of the miniature watch that directly or indirectly contributes to configuring or connecting the bracelet to the miniature watch case. [Explanation of Symbols]

[0073] 7, 9 Bracelet chain 10 Covers 30 Actuator 40 Adjustable link elements 44 Locking stopper 46 Drive return stop 50 First elastic return element 70 Second elastic return element 100 racks

Claims

1. A cover (10); An adjustment link element (40) designed to be connected to a bracelet chain (9), wherein the adjustment link element (40) is movably attached in the longitudinal direction in which the bracelet chain connected to the adjustment link element extends or contracts so that the displacement of the adjustment link element (40) relative to the cover (10) can increase or decrease the length of the bracelet chain, an adjustment link element (40); An actuating device (30) arranged on the cover (10) so as to be at least movable relative to the cover in the longitudinal direction; A first kinematic connection connecting the actuating device (30) and the adjustment link element (40) such that at least longitudinal actuation of the actuating device (30) relative to the cover (10) causes longitudinal displacement of the adjustment link element (40) relative to the cover (10); A device for adjusting the length of a bracelet, comprising:

2. The actuating device (30) is arranged on the upper surface (12) of the cover. The device for adjusting the length of a bracelet according to Claim 1.

3. The device includes a first elastic return element (50) connected to the actuating device (30) and acting on the actuating device (30) to return the actuating device (30) to a rest position after the actuating device (30) has been actuated by a user. The device for adjusting the length of a bracelet according to Claim 1.

4. The device further includes: A locking device that can occupy two configurations, namely a first locking configuration that acts on the adjustment link element (40) to prevent displacement of the adjustment link element (40) relative to the cover (10), and a unlocking configuration that unlocks the adjustment link element (40) that is movable relative to the cover, a locking device; A locking / unlocking element connected to the locking device via a second kinematic connection such that it can be actuated by a user and the locking configuration of the locking device can be switched to the unlocking configuration of the locking device by actuation of the locking / unlocking element. The device for adjusting the length of a bracelet according to Claim 1.

5. The locking / locking release element and the actuating device are one and the same part, and at least one actuation of the actuating device causes a switching from the locking configuration to the locking release configuration of the locking device and a longitudinal displacement of the adjusting link element. A device for adjusting the length of a bracelet according to claim 4.

6. The actuating device (30) is movable relative to the cover (10) in at least a second direction different from the longitudinal direction, and the first kinematic connection between the actuating device (30) and the adjusting link element (40) causes a switching from the locking configuration to the locking release configuration of the locking device by the actuation of the actuating device (30) in the second direction. A device for adjusting the length of a bracelet according to claim 5.

7. The first kinematic connection between the actuating device (30) and the adjusting link element (40) causes a switching from the locking configuration to the locking release configuration of the locking device by the actuation of the actuating device (30) in the longitudinal direction. A device for adjusting the length of a bracelet according to claim 5.

8. A second elastic return element (70) connected to the locking device and acting on the locking device to return it to the locking configuration A device for adjusting the length of a bracelet according to claim 1, comprising.

9. The actuating device (30) is movable in both longitudinal directions relative to the cover (10), and the first kinematic connection connecting the actuating device (30) and the adjusting link element (40) causes a longitudinal displacement of the adjusting link element (40) in the first direction with respect to the cover (10) when the actuating device (30) is actuated in the first longitudinal direction with respect to the cover (10) when the locking device is in the locking release configuration, and a longitudinal displacement of the adjusting link element (40) in the second direction with respect to the cover (10) when the actuating device (30) is actuated in the second direction opposite to the first direction in the longitudinal direction with respect to the cover (10) when the locking device is in the locking release configuration. A device for adjusting the length of a bracelet according to claim 1.

10. The locking device includes a detent system on at least one side wall (13) or base (16) of the cover (10) and a locking detent (44) connected to the adjusting link element (40). Device for adjusting the length of the bracelet according to claim 1.

11. Including at least one stop for limiting the longitudinal displacement of the actuating device (30), the longitudinal displacement from the rest position of the actuating device (30) to the position facing the stop results in a displacement along a length corresponding to a multiple of the distance between two teeth of the return stop system of the actuating device (30), whereby the adjustment link element (40) can occupy a finite number of positions and is displaced one position at a time with each actuation of the actuating device (30). Device for adjusting the length of the bracelet according to claim 1.

12. The first kinematic connection includes at least one rack (100) and at least one drive return stop (46), and due to the actuation of the actuating device (30), the at least one drive return stop (46) cooperates with the rack (100) to cause displacement of the adjustment link element (40). Device for adjusting the length of the bracelet according to claim 1.

13. A clasp including the device for adjusting the length of the bracelet according to claim 1.

14. A bracelet including the clasp according to claim 13.

15. A timepiece, particularly a wristwatch, including the bracelet according to claim 14.

16. An expandable clasp for a bracelet including the device for adjusting the length of the bracelet according to claim 1.

17. The actuating device (30) extends throughout the length of the cover. Device for adjusting the length of the bracelet according to claim 2.

18. The actuating device (30) forms the central part of the cover. Device for adjusting the length of the bracelet according to claim 2.

19. At least in the rest position, the actuating device (30) includes an upper surface (31) continuously arranged on the upper surface of the cover, forming a continuous surface of the cover substantially parallel to the upper surface of the bracelet chain connected to the adjustment link element. Device for adjusting the length of the bracelet according to claim 2.

20. The second direction is a direction perpendicular to the surface of the bracelet chain connected to the adjustment link element or a direction perpendicular to the longitudinal direction of the bracelet chain connected to the adjustment link element (40). Device for adjusting the length of the bracelet according to claim 6.

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