Comfort adjustment device for a wristwatch

Abstract

The invention relates to a comfort adjustment device for a wristwatch, comprising a support (12) and a contact portion (86) intended to come into contact with the wrist of the wearer of the wristwatch. The contact portion (86) is mounted so as to be adjustable relative to the support (12) by a control member (72) so as to vary the distance between the contact portion (86) and the support (12) so as to adjust the comfort during wearing of the wristwatch. The invention also relates to a wristwatch comprising a comfort adjustment device integrated with a buckle of the watch strap, in particular a buckle of the folding buckle type. The contact portion (86) and the support (12) are arranged one above the other in a stacking direction, and the distance between the contact portion (86) and the support (12) extends along the stacking direction.

Description

Technical Field

[0001] This invention relates to the field of horology, and more particularly to a comfort adjustment device for a wristwatch. This device can be particularly integrated into a clasp, especially into a folding clasp type clasp. The invention also relates to a folding clasp including the comfort adjustment device, and a wristwatch including such a clasp. Background Technology

[0002] Devices for adjusting the length of a watch strap to ensure a comfortable fit, particularly for watches, are well known in the prior art. Generally, these devices can be divided into two categories: those integrated between two elements of the strap to change the distance between them, and those integrated into the clasp of the strap to adjust the length of the clasp when closed.

[0003] Whether integrated into the clasp or the strap itself, these devices are all designed to modify the effective length of the strap so that it can be adjusted to fit the wearer's wrist size.

[0004] Adjusting the clasp or strap length often results in gaps or misalignments, negatively impacting the strap's appearance. Some solutions attempt to conceal this misalignment by integrating the ends of the strap strands into the cover, but misalignment is particularly detrimental to the strap's aesthetic appeal. Other solutions propose sliding links, which help minimize the clasp's volume at the thickness level. However, this type of solution is incompatible with ceramic straps due to the thinness of the components required to house the adjustment system within the links.

[0005] There are also devices for wristwatches equipped with an adjustment wheel designed to rotate for fine-tuning to achieve a proper fit by modifying the effective length of the strap. Such devices are described, for example, in publications US20170086535A1 and EP1588640A1. Summary of the Invention

[0006] Therefore, the object of the present invention is to provide a comfort adjustment device for a wristwatch that can be specifically integrated into a clasp and is intended to at least partially solve the aforementioned disadvantages.

[0007] Another object of the present invention is to provide a comfort adjustment device for a wristwatch as an alternative to known comfort adjustment devices designed to modify the effective length of the watch strap.

[0008] These objectives are achieved, at least in part, by a comfort adjustment device for a wristwatch, comprising a support member and a contact portion intended to contact the wearer's wrist. The contact portion is mounted so as to be adjustable relative to the support member by means of a control member, thereby changing the distance between the contact portion and the support member to adjust the comfort of the wristwatch when worn. The contact portion and the support member are arranged in a stacking direction, one on top of the other. The aforementioned distance extends along the stacking direction, separating the contact portion from the support member and being variable by means of the control member.

[0009] In one embodiment, the contact portion is arranged to rise or fall relative to the support in a direction perpendicular to a longitudinal axis of the forearm, which passes through the center of the wearer's wrist, when the watch is worn.

[0010] In one embodiment, the contact portion is connected to the control member via at least one kinematic link.

[0011] In this embodiment, the control component is associated with the support component.

[0012] In one embodiment, the contact portion is in the form of a blade. A kinematic link is arranged to connect a control member to one end of the blade so that the end can move relative to the support when the control member is actuated.

[0013] In one embodiment, the device further includes a second kinematic link arranged to connect a control member to the other end of the blade-like structure so that the other end can be moved relative to the support when the control member is actuated.

[0014] In an embodiment, the link or each kinematic link includes a transmission member that is movable in a translational direction by a control member and connected to a link element that is hinged between the corresponding end of the blade and the transmission member.

[0015] In one embodiment, the transmission component is arranged within the support member.

[0016] In this embodiment, the control component is rotatably operable.

[0017] In one embodiment, the transmission member includes a curved groove that is not concentric with the axis of rotation of the control member. The control member includes a drive element configured to engage with the groove to translate the transmission member when the control member rotates.

[0018] In one embodiment, the control component is arranged within the support.

[0019] In one embodiment, the control member includes an indexing mechanism that provides multiple stable positions to the control member.

[0020] In one embodiment, the control component is an adjusting wheel with a central portion configured to accommodate an indexing mechanism.

[0021] Another aspect of the invention relates to a fastener that includes a comfort adjustment device according to one of the foregoing embodiments.

[0022] In one embodiment, the clasp includes a frame that serves as a support for a comfort adjustment mechanism, with two hinged arms connected to the ends of the frame. Each of these arms is connected to a connecting member intended to be attached to one end of the strap strands.

[0023] In one embodiment, the two hinged arms are configured to lock against the frame by means of a locking mechanism that is partially integrated into the central portion of the control member.

[0024] Another aspect of the invention relates to a wristwatch that includes a clasp according to one of the foregoing embodiments. Attached Figure Description

[0025] Examples of embodiments of the invention are described in the specification with reference to the accompanying drawings, in which: Figure 1 A perspective view of a watch clasp in a closed configuration according to a preferred embodiment of the present invention is shown, the watch clasp integrating a comfort adjustment device for the watch strap; Figure 2 It shows Figure 1 The buckle shown is a bottom perspective view; Figure 3 It shows the configuration in unfolded form. Figure 1 A perspective view of the clasp shown; Figure 4 An exploded view of the locking / unlocking mechanism of the buckle is shown; Figure 5 yes Figure 4 An enlarged view of one of the locking elements of the mechanism shown; Figure 6a A side view of the locking / unlocking mechanism of the latch in a locking configuration is shown; Figure 6b A side view of the locking / unlocking mechanism of the latch in the unlocked configuration is shown; Figure 7 An exploded view of the comfort adjustment mechanism of the watch strap is shown, which is arranged on the underside of the buckle frame; Figure 8a It shows Figure 7 A perspective view of the scale member of the comfort adjustment device for the watch strap shown; Figure 8b It shows Figure 8aA top view of the indexing component shown; Figure 9 It shows Figure 7 A top view of the control components of the comfort adjustment device for the watch strap shown; Figure 10a A side view of the clasp in its closed configuration is shown, with the strap's comfort adjustment mechanism in the first increment position; Figure 10b It shows Figure 10a The clasp shown is a cross-sectional view along line AA; Figure 11a It shows something similar to Figure 10a The view shows the comfort adjustment mechanism of the watch strap in the second division position; Figure 11b It shows Figure 11a The cross-sectional view of the clasp shown along line BB; Figure 12a It shows something similar to Figure 11a The view shows the comfort adjustment mechanism of the watch strap in the third division position; Figure 12b It shows Figure 12a The cross-sectional view of the clasp shown along line BB; Figure 13a and Figure 13b Two schematic diagrams are shown, respectively, of a wristwatch in a first comfort adjustment state and a second comfort adjustment state according to another embodiment, wherein the wristwatch integrates the comfort adjustment device of the strap into a clasp, and Figure 14a and Figure 14b Two schematic diagrams are shown of a wristwatch in a first comfort adjustment state and a second comfort adjustment state according to another embodiment, which integrates the comfort adjustment device of the strap into the clasp. Detailed Implementation

[0026] exist Figures 1 to 12b The clasp 10 shown in the illustration, by way of non-limiting example, integrates a comfort adjustment device according to a preferred embodiment of the invention. More specifically, the clasp 10 is a folding clasp type for closing a watch strap comprising two free ends.

[0027] In a general manner, the clasp 10 includes: a support member, typically a frame 12; a first arm 23 and a second arm 24, respectively hinged to a first end and a second end of the frame 12; and a first connecting member 34 and a second connecting member 36, respectively connected to one end of the first arm 23 and the second arm 24 and arranged to engage with a first free end and a second free end of the watch strap. The clasp 10 further includes a closure mechanism 40 configured to lock the first arm 23 and the second arm 24 against a first side of the frame 12, as described later.

[0028] Hook 10 further includes, especially in Figure 7 The comfort adjustment device 70 shown in the figure includes a contact portion 86, for example in the form of a pad or leaf, mounted on a second side of the frame 12 opposite to the first side and intended to contact the wrist of the wearer of the watch strap. Thus, the contact portion 86 and the frame 12, which acts as a support, are arranged in a stacking direction with one on top of the other. The comfort adjustment device 70 is adapted to change the distance between the contact portion 86 and the frame 12 in the stacking direction, as described below.

[0029] The device 70 further includes a rotatably operable control member 72 and two motion links 88 arranged on both sides of the control member 72 and connecting the control member to the two opposite ends of the blade 86 so as to change the distance between the blade 86 and the frame 12 by raising or lowering the frame 12 relative to the blade (depending on whether the control member 72 rotates clockwise or counterclockwise).

[0030] For example, especially from Figures 1 to 4 As can be seen more clearly, the overall shape of the frame 12 is advantageously curved to conform to a portion of the circumference of the wearer's wrist. The first arm 23 and the second arm 24 are hinged at the two ends of the frame 12 by mounting rods 32a. Each arm 23, 24 includes two lateral branches 26, one end of each branch being connected to the other branch by a fastening element 28, which is connected by mounting rods 32b to one of the connecting members 34, 36 arranged to engage with the free end of the strap.

[0031] The first side of the frame 12 includes two receiving portions 18 and 19 arranged on both sides of the central portion 14 of the frame 12. Each of the two receiving portions 18 and 19 includes a recess 20 for receiving two lateral branches 26 of the two arms 23 and 24 and a fastening element 28.

[0032] Special Reference Figure 4 , Figure 5 , Figure 6a and Figure 6bThe closing mechanism 40 includes an actuator 42, a return member 54 acting on the actuator, and two locking elements 56a, 56b arranged to move orthogonally to the direction of movement of the actuator 42. The actuator preferably has a substantially square profile, and each connecting member 34, 36 includes a "U"-shaped portion designed to engage around half of the profile of the actuator 42 when the latch 10 is in the closed configuration, as particularly in… Figure 1 As illustrated in the figure. Therefore, the actuator 42 and the connecting members 34, 36 preferably have complementary shapes.

[0033] refer to Figure 5 Each locking element 56a, 56b includes, on the one hand, a latch 58 arranged to engage with teeth 30 on fastening elements 28 located on the first arm 23 and the second arm 24 respectively, and on the other hand, a block 60 provided with an elongated opening 62. The elongated openings of the two blocks are juxtaposed and inclined along an axis of symmetry. The angle of inclination of each elongated opening 62 relative to the total plane of the central portion 14 of the frame is preferably equal to 45°.

[0034] like Figure 4 As shown, the closing mechanism 40 further includes a support member 46, which includes: a plate 48 having at least one opening, preferably two openings 50, for example having a rectangular shape; and fixing tabs 52 for securing the support member 46 to the central portion 14 of the frame 12.

[0035] The pusher 42 includes at least one fastening element, preferably two fastening elements 44, located on the underside of the pusher 42 and near its two opposite edges. These two fastening elements 44 pass through two openings 50 of the plate 48 and are connected to blocks 60 of locking elements 56a, 56b via connecting rods 64 passing through elongated openings 62 in each block. The two blocks 60 are arranged in openings 16 extending through the central portion 14 of the frame 12.

[0036] The return member 54 of the actuator 42 may take the form of a flexible blade, particularly a "V" shape. In this example, the flexible blade is arranged between the actuator 42 and the plate 48 to support the abutment plate and bring the actuator 42 back to its rest position.

[0037] like Figure 6a As shown, the latches 58 of the two locking elements are positioned against the teeth 30 of the fastening elements 28 on the first arm 23 and the second arm 24, respectively, to lock these arms against the first side of the frame 12. When pressure is applied to the pusher 42, the action of the connecting rod 64 on the two blocks 60 allows them to move in a direction orthogonal to the movement of the pusher 42 and in two opposite directions, so as to disengage the latches 58 from the teeth 30, as... Figure 6bAs shown in the diagram. Therefore, the two arms 23 and 24 can be extended to open the clasp.

[0038] refer to Figure 7 and Figure 9 The control element is preferably in the form of an adjusting wheel 72 mounted between the second side of the frame 12 and the blade-like structure 86. The blade-like structure preferably includes a flat central portion 86a intended to rest on the upper part of the wearer's wrist, and two curved portions 86b located on either side of the central portion. The adjusting wheel 72 includes an annular portion 73 defining a central opening 76, within which the indexing structure, described later, is mounted. The outer profile of the adjusting wheel 72 is preferably knurled to improve its maneuverability. Furthermore, the dimensions of the adjusting wheel 72 have been determined such that the two diametrically opposed portions extend beyond the width of the frame 12 on either side of the central portion, as shown below. Figure 2 As shown in the diagram.

[0039] exist Figure 7 In the example shown, each motion link 88 is mounted in a recess 21 of the frame and includes a transmission member 89 and a link element 92, which is connected to the transmission member 89 on one side and to one of the ends of the blade 86 on the other. For this purpose, each end of the curved portion 86b of the blade 86 includes a fastening element 87, which is connected to the link element 92 of the corresponding motion link via an assembly rod 94a.

[0040] The drive component 89 and link element 92 of each motion link 88 are connected together by an assembly rod 94b, the ends of which are fitted into two longitudinal openings 21a located at the two side edges of the recess 21 of the frame. The length of these longitudinal openings is determined based on the maximum desired adjustment range for strap comfort.

[0041] The transmission member 89 is configured to move under the action of one of two drive elements 74a, 74b, which are connected to the adjusting wheel 72 and arranged diametrically opposite each other. This allows the corresponding end of the blade 86 to move relative to the frame 12 via the link element 92 when the adjusting wheel 72 rotates to raise or lower the frame relative to the blade.

[0042] More specifically, each transmission member 89 includes a curved groove 90 in which one of two drive elements 74a, 74b is disposed, which may be, for example, in the form of pins fixed to one side of the adjusting wheel 72 by press fit. The curved groove of each transmission member 89 is non-concentric with respect to the axis of rotation of the control member 72 so as to induce translational movement of each transmission member 89 when the control member rotates. The curved groove 90 is also characterized by central symmetry with respect to the center of rotation of the control member 72.

[0043] refer to Figure 8a , Figure 8b and Figure 9 The strap comfort adjustment device 70 further includes a dividing mechanism. This mechanism includes: a dividing member 80 disposed within the central opening 76 of the adjustment wheel 72; and dividing devices 78a and 78b connected to the adjustment wheel 72 and configured to cooperate with the dividing member 80 to divide the adjustment wheel 72 into different angular positions corresponding to different degrees of adjustment.

[0044] More specifically, the indexing device may take the form, for example, two diametrically opposed flexible blades 78a, 78b connected to the adjusting wheel 72. These flexible blades may extend, for example, along a circular portion of the inner edge of the adjusting wheel. The indexing member 80 includes a base 81 and a wall 82 perpendicular to the base and at least partially circular. The wall 82 includes a plurality of recesses 83a, 83b, 83c designed to engage with the free ends 79 of each flexible blade 78a, 78b of the adjusting wheel 72, the ends having a shape complementary to the contour of the recess. The indexing member 80 is fixed to a second side of the frame at the central portion 12 of the frame 12. The mounting surface of the indexing member 80 against the frame 12 includes a recess 84 to partially receive the two blocks 60 of the strap closure mechanism 40.

[0045] Figure 10a and Figure 10b The illustration shows a watch clasp in a closed configuration and in the first adjustment state of the device (more specifically, corresponding to the first extreme adjustment state). In this state, each pin 74a, 74b is located inside each recess 90 near one end. The free ends 79 of the two flexible blades of the adjusting wheel are held against two diametrically opposed recesses 83a of the indexing member 80 to hold the comfort adjustment device in this state. The end of the component rod 94a passing through the transmission member 89 and the link element 92 rests against one edge of a longitudinal opening located at the two side edges of the recess. In this configuration, the blades 86 press against the second side of the frame, as... Figure 10a As shown in the diagram. When wearing a watch equipped with the buckle, the leaf-shaped part 86 rests against the wrist portion that is substantially opposite to the wrist portion on which the watch case rests.

[0046] Figure 11a and Figure 11bThe illustration shows the clasp in its closed configuration and in a second adjustment state of the device (more specifically, corresponding to an intermediate adjustment state between two extreme adjustment states). In this second state, each pin 74a, 74b has moved along its corresponding groove 90 to reach the midpoint of the groove. This displacement causes a translational movement of each transmission member 89 and each link element 92, such that the frame 12 is raised relative to the blade 86 or the blade 86 is lowered relative to the frame 12. In other words, the displacement generates movement along the stacking direction of the blade and the frame. The frame 12 can generally be raised or lowered relative to the blade 86 in a direction substantially orthogonal to the longitudinal axis of the forearm, which may, for example, pass through the center of the wearer's wrist when wearing a wristwatch. Alternatively, this stacking direction may be tilted relative to the longitudinal axis of the forearm, preferably slightly tilted.

[0047] This relative movement between frame 12 and blade 86 creates a gap between the blade and the frame, such as Figure 11a As shown in the diagram, the free ends 79 of the two flexible blade-like parts of the adjusting wheel are held against two other recesses 83b of the indexing mechanism 80 to keep the strap comfort adjustment device in this second state. At this time, the end of the component rod 94b passing through the transmission member 89 and the link element 92 is positioned midway between the two side edges of the longitudinal opening 21a.

[0048] Figure 12a and Figure 12b The illustration shows the clasp in its closed configuration and in the third adjustment state of the device (more specifically, corresponding to the second extreme adjustment position). In this third state, each pin 74a, 74b has moved along its corresponding groove 90 to approach the other end of the groove. This additional movement has caused additional translational movement of each transmission member 89 and each link element 92 to further raise the frame 12 relative to the blade 86 or further lower the blade 86 relative to the frame 12 in a direction substantially perpendicular to the longitudinal axis of the forearm, which passes through the center of the wearer's wrist when the watch is worn.

[0049] like Figure 12a As illustrated, this additional relative movement thus increases the gap between the blades and the support. The free ends 79 of the two flexible blades of the adjusting wheel are held against two other recesses 83c of the indexing mechanism 80 to keep the strap comfort adjustment device in this third state. At this time, the end of the component rod 94b passing through the transmission member 89 and the link element 92 rests against another edge of the longitudinal opening 21a.

[0050] The comfort adjustment device can be moved from the first state to the second or third state (such as when the buckle is in place) by rotating the adjustment wheel 72 clockwise. Figure 10b , Figure 11b and Figure 12b (As shown in the top view of the cross-section illustration) allows the strap to tighten around the wearer's wrist. Conversely, the wearer can loosen the strap around the wrist by turning the adjustment wheel counterclockwise, allowing the comfort adjustment mechanism to return to the first or second position.

[0051] Other embodiments of the comfort adjustment device are conceivable to change the distance between the contact portion intended to contact the wearer's wrist and the support member including the control components along the stacking direction. Figure 13a and Figure 13b An example of a wristwatch including a clasp 10 is schematically illustrated. This clasp integrates a comfort adjustment mechanism, wherein a control member 72 is mounted on a support member 12 to act directly on a contact portion 86. The control member may, for example, include a threaded portion 72a that engages with a threaded hole formed in the support member 12, the end of which acts directly on the contact portion 86. The end of the contact portion 86 may be hinged by means of two sliders arranged to move translationally within two recesses 95 formed in the support member and acting as guides.

[0052] Indication Figure 14a and Figure 14b The figures illustrate another embodiment, showing a wristwatch including a clasp 10 that integrates a comfort adjustment mechanism, wherein the control member 72 moves in a translational manner rather than rotating, typically by means of an inclined plane. The control member may, for example, take the form of a 'push-push' type actuator 72 acting on two transmission members 96, each transmission member being connected, for example by means of a hinge, to one end of a contact portion 86 and arranged within a support member 12 for movement in a direction perpendicular to the movement of the actuator 72.

[0053] In a general manner, and particularly regardless of the described embodiments, it should be noted that the support member 12 may be integrated into or attached to the clasp, strap, or even the watch case (especially the case back). Furthermore, the control member 72 may be attached to one of the surfaces of the frame or at least partially integrated into the frame.

[0054] Without departing from the scope of the appended claims, further modifications can be made to the comfort adjustment device according to the various embodiments described above. For example, the adjustment device can be adapted to be associated with the links of the strap rather than with a clasp, so as to adjust the space between the contact portion and the underside of the links stacked on the contact portion in the stacking direction. Thus, the underside of the links can rest against the contact portion (corresponding to the strap state with maximum adjustment), and the variation in space between the contact portion and the underside of the links will allow the strap to be tightened according to the wearer's wrist size, so that the wearer enjoys optimal comfort when wearing it.

[0055] List of reference numerals Adjustable buckle 10 Frame 12 Central section 14 Opening 16 Receiving sections 18 and 19 Recess 20 Recess 21 Longitudinal opening 21a Arrangement Structure 22 First and second arms, 23, 24 Lateral branch 26 Fastening element 28 30 teeth Mounting rods 32a, 32b Connecting components 34 and 36 Closing mechanism 40 Pusher 42 Fastening element 44 Support component 46 Board 48 Opening 50 (e.g., rectangular shape) Fixed protrusion 52 Return to component 54 Locking elements 56a, 56b Latch 58 Block 60 Elongated opening 62 Connecting rod 64 Comfort adjustment device 70 Control component 72 73 ring-shaped part Drive elements 74a, 74b (e.g., pins) Center opening 76 Flexible leaf-shaped structures 78a, 78b Free end 79 Indexing component 80 Base 81 Circular wall 82 Indexing elements 83a, 83b, 83c (e.g., recesses) Recess 84 Contact portion 86 (e.g., leaf-shaped part) Central flat portion 86a Bending section 86b Fastening element 87 88 kinematic links Transmission component 89 90° curved groove Link element 92 Component rods 94a and 94b.

Claims

1. A comfort adjustment device (70) for a wristwatch, the comfort adjustment device comprising a support (12) and a contact portion (86) intended to contact the wrist of the wearer of the wristwatch, the contact portion (86) being mounted so as to be adjustable relative to the support (12) by a control member (72) to change the distance between the contact portion (86) and the support (12), thereby adjusting the comfort during wearing of the wristwatch, characterized in that, The contact portion (86) and the support member (12) are arranged one on top of the other along the stacking direction, and the distance between the contact portion (86) and the support member (12) extends along the stacking direction.

2. The apparatus (70) according to claim 1, wherein, The contact portion (86) is arranged to rise or fall relative to the support (12) in a direction perpendicular to the longitudinal axis of the wearer's forearm when the watch is worn.

3. The apparatus (70) according to claim 1 or 2, wherein, The contact portion (86) is connected to the control member (72) via at least one kinematic link (88).

4. The apparatus (70) according to the preceding claim, wherein, The control component (72) is associated with the support component (12).

5. The apparatus (70) according to claim 3 or 4, wherein, The contact portion is in the form of a blade (86), and the motion link (88) connects the control member (72) to one end of the blade (86) so that the end can be moved relative to the support (12) when the control member (72) is actuated.

6. The device (70) according to the preceding claim further includes a second kinematic link (88) that connects the control member (72) to the other end of the blade (86) so that the other end can be moved relative to the support (12) when the control member (72) is actuated.

7. The apparatus (70) according to claim 5 or 6, wherein, The link or each kinematic link includes a transmission member (89) that is movable in a translational direction via the control member (72) and connected to a link element (92) that is hinged between the corresponding end of the blade and the transmission member (89).

8. The apparatus (70) according to claim 7, wherein, The transmission component (89) is arranged inside the support (12).

9. The apparatus (70) according to any one of the preceding claims, wherein, The control component (72) is rotatably operable.

10. The apparatus (70) according to any one of the preceding claim and claim 7 or 8, wherein, The transmission member (89) includes a curved groove that is not concentric with the rotation axis of the control member, and the control member (72) includes drive elements (74a, 74b) configured to engage with the groove to translate the transmission member (89) when the control member (72) rotates.

11. The apparatus (70) according to any one of the preceding claims, characterized in that, The control component (72) is arranged inside the support (12).

12. The apparatus (70) according to any one of the preceding claims, wherein, The control component (72) includes an indexing mechanism that provides multiple stable positions to the control component.

13. The apparatus (70) according to any one of the preceding claim and claim 9 or 10, wherein, The control component (72) is an adjustment wheel with a central portion configured to accommodate the indexing mechanism.

14. A fastener (10) comprising a device (70) according to any one of the preceding claims.

15. The clasp (10) according to the preceding claim, comprising a frame (12) serving as a support for the comfort adjustment device (70), and two hinged arms (23, 24) connected to an end of the frame, each of the two hinged arms being connected to a connecting member (34, 36) intended to be attached to one end of a strap strand.

16. The buckle (10) according to the preceding claim, wherein, The two hinged arms (23, 24) are configured to lock against the frame (12) by means of a closing mechanism (40), which is partially integrated into the central portion of the control member (72).

17. A wristwatch comprising a clasp (10) according to any one of claims 14 to 16.

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