Device comprising a return element

Abstract

A clasp or link for a wristwatch comprising a mechanical device (11) including a return element (14) comprising a flat spring and at least one first cooperation structure (15) and a component (12) comprising one or more second cooperation structures (16, 17). Said at least one first cooperation structure being made in one piece with said return element, or said at least one first cooperation structure being arranged as one or more separate pieces from the return element, said return element being arranged to act on at least one separate piece comprising said at least one first cooperation structure.

Description

Technical field

[0001] The present invention relates to a device for connection to a bracelet, clasp and / or a wristwatch case. The device is preferably an element of a clasp and / or a link for a bracelet. The invention also relates to an assembly comprising the device and another component, a clasp for a wristwatch, a link for a wristwatch bracelet, and a return element which can be used in the device of the invention. State of the art and problems giving rise to the invention

[0002] Wristwatch straps generally include means for adjusting the strap length. For example, in the case of leather or plastic straps, the free end of one of the two strands of the strap has a series of holes distributed in the longitudinal direction of the strap. The free end of the other strand of the strap has a connecting device, for example a pin buckle, allowing the two strands to be joined by inserting the pin into the hole corresponding to the desired length. In the case of metal link bracelets, the strap length is adjusted by removing or adding a link in one or both strands of the strap. However, in either case, the possible adjustments of the useful length of the strap are quite coarse and it is possible that the circumference of the wearer's wrist lies between two adjacent settings.

[0003] The prior art discloses clasps for wristwatches that allow fine adjustment of the strap length. Such fine adjustment is desirable to precisely adapt the strap length to the wrist of the wearer of a wristwatch. On the other hand, as raised in EP 2361523, the size of a wearer's wrist may vary with changes in temperature, for example.

[0004] Many clasps equipped with a mechanism for adjusting the length on a finer scale are known from the state of the art.

[0005] Swiss patent CH 699 067 describes a device for adjusting the length of a bracelet comprising a first part, in particular a clasp cover, comprising holes, and a second part for attaching the free end of a bracelet strand, and a ball ratchet arranged so that the ball of the ratchet can be inserted into a hole to define a discreet bracelet length and stabilized by the spring of the ratchet, this spring biasing the ball towards the hole. To change the length, a user can pull or push on the bracelet strand, in order to force the release of the ball from the hole. Then, the strand can be moved until the ball is placed in another hole defining a shorter or longer length position, according to the user's desire.

[0006] Ball pawls as used in CH 699 067 are standard components in the manufacture of small mechanical parts, such as watches and their accessories. However, these pawls have several disadvantages, especially when used in a length adjustment mechanism like the one in the aforementioned Swiss patent. A significant disadvantage is the fact that the retention force that can be exerted by the ball is low and is not sufficient in many situations. This lack of force is illustrated by WO 2020 / 187907, relating to a clasp in which ball pawls are used to retain the clasp blades in the closed position. To achieve the required force, the number of ball pawls is multiplied, so that for each of the two leaflets, four ball pawls (two double pawls) are used.

[0007] The lack of strength of a ball ratchet comes at least in part from the fact that most of the ball is housed and retained in a tube. The end of the tube forms an annular rim towards the inside, this rim defining a circle with a radius smaller than that of the ball, which allows the ball to be retained in the tube and allows less of the ball to protrude to perform a clip mechanism, for example. This construction is also delicate, susceptible to wear and malfunctions. Maintaining these ratchets, for example, replacing them in the event of failure, is expensive.

[0008] The present invention seeks to avoid the disadvantages of the state of the art and in particular of the mechanisms of watch strap clasps and other mechanical parts based on ball ratchets. The invention seeks to provide a ratchet that does not suffer from the disadvantages of the state of the art.

[0009] It is an objective to implement a pawl that can be miniaturized for use in a clasp for a wristwatch strap, in particular in a thin and / or flat clasp. It is an objective to implement a pawl that operates reliably and guarantees the desired stability. It is also an objective to implement a pawl-type system that allows the force exerted to be adjusted to obtain the desired stability and reliability in a given case, for example in the context of an opening mechanism and in particular in a mechanism for adjusting the useful length. It is an objective to implement a system whose assembly and maintenance, for example the changing of parts, is quick and easy. Another objective is to reduce the number of parts as much as possible.

[0010] It is an objective to implement a device which can be integrated into different elements of a wristwatch strap, for example in a clasp and / or in a link.

[0011] It is an objective to implement a device which can replace and / or constitute the jersey of a jersey bracelet, in particular for wristwatch. Summary of the invention

[0012] In one aspect, the present invention relates to a device for connection to a wristwatch bracelet, case and / or clasp, said device comprising a return element, said return element comprising at least one first cooperation structure. In the device, the first cooperation structure may also be a separate part. In this case, the return element is arranged to act on at least one first cooperation structure.

[0013] In a preferred embodiment, said device comprises a housing for housing said return element. The return element is preferably housed in and / or by said device.

[0014] In a preferred embodiment, said device comprises at least two separate parts, a first part comprising a housing for the return element, and the second part comprising said return element. In another embodiment, said return element and said device are made in one piece.

[0015] In a preferred embodiment, said at least one first cooperation structure is arranged to be able to cooperate with one or more second cooperation structures, said one or more second cooperation structures being arranged in a component for connection to said bracelet or to a wristwatch clasp.

[0016] In a preferred embodiment, said component comprises at least one part comprising said one or more cooperation structures.

[0017] In one embodiment, said device is connected to the component or is arranged to be connected to the component. This connection preferably involves cooperation, engagement and / or contact between said one or more first and second cooperation structures.

[0018] In one embodiment, said device is arranged so as to be able to perform a movement relative to said component.

[0019] In one embodiment, the component is a support, a complementary part and / or a cover, preferably arranged to be able to receive said device and / or to house at least part of said device.

[0020] In a preferred embodiment, said device is a mechanical device and / or said component is a mechanical component.

[0021] In a preferred embodiment, said at least one first cooperation structure and at least one of said one or more second cooperation structures are arranged to define a predefined and / or defined cooperation position, distance and / or space between said mechanical device and said component when said at least one first cooperation structure is in a cooperation position with at least one of said second cooperation structures.

[0022] In a preferred embodiment, said return element comprises a flat and / or flattened spring. Preferably, the return element is also longitudinal.

[0023] In a preferred embodiment, said at least one first cooperating structure is at least one protrusion and / or male portion, and said one or more second cooperating structures is one or more notches and / or female portions. Said protrusion is preferably arranged to be placed in said notch.

[0024] Said male and female parts are preferably arranged to define a predefined and / or defined position, distance and / or cooperation space when said male part is placed in said female part.

[0025] In a preferred embodiment of the device and / or assembly of the invention, one or a pair of said one or more second cooperating structures defines a stable and discrete position between said mechanical device and said component.

[0026] In another aspect, or according to a preferred embodiment, the present invention relates to a return element comprising at least one elastic section, the elastic section comprising a length Lo, a width LA and a thickness E, in that LA > E, and preferably LA >1.5xE (the extension LA is at least 1.5 times the extension of E), said return element being arranged to have elastic properties in the direction of the length Lo. Preferably, LA >1.25xE, >1.75xE, >1.8xE, >2.0xE, >2.25xE, >2.5xE, >2.75xE, > 3xE, > 3.5xE, > 4xE, > 4.5xE, or > 5xE. Preferably, the width is greater than the thickness, preferably by one of the factors indicated. This distinguishes the spring of the invention from a coil spring, which generally has identical widths and thicknesses, due to the tubular outer shape of the coil spring.

[0027] In a preferred embodiment, said return element comprises a corrugated, ringed, and / or zigzag elastic section or zone. This section comprises a longitudinal and / or wire element forming repeated corrugated, ringed, and / or zigzag patterns. Said elastic section and / or said patterns preferably extend in a plane and / or on a flat or curved surface. Said plane is preferably defined by and / or parallel to the X and Y directions according to the Figure 2B , the extension of the return element (or its elastic section) in said directions X and Y preferably defining the length Lo and the width LA of the return element (or its elastic section).

[0028] Preferably, an elastic section of the return element comprises is / or is formed by said wire element when it follows said wavy, ringed and / or zigzag direction.

[0029] The elastic section and / or the corrugated, ringed and / or zigzag portion is preferably non-helical.

[0030] In a preferred embodiment, said return element comprises at least one elastic section which extends in a spatial direction X in order to exhibit an elastic deformation property in said direction X, said elastic section also extending in spatial directions Y and Z, said directions X, Y, Z being perpendicular to each other, characterized in that the extension of the elastic section in one of the directions Y, Z is less than the extension in the other of the two directions Z, respectively Y.

[0031] In a preferred embodiment, said elastic section gives said return element the property of elastic deformation in said direction X, corresponding to the longitudinal direction of the return element.

[0032] Said elastic deformation property is preferably an elastic deformation sought, used and / or exploited, for example in a clasp and / or a link comprising said return element. Preferably, said elastic deformation allows the return element to perform its function as a return element.

[0033] In a preferred embodiment, said return element comprises at least one elastic section, the elastic section comprising a length Lo, a width LA and a thickness E, characterized in that LA > E, and preferably LA >1.5 E, and in that said return element is arranged to have elastic and / or return properties in the direction of the length Lo.

[0034] In a preferred embodiment, said elastic section comprises more than one, preferably more than two, and even more preferably more than 3, 4, 5, and 6 undulations, waves, zigzags, or other recurring and / or repeated units and / or patterns provided to condense the length of the elastic section relative to the length of the wire element forming said elastic section.

[0035] Preferably, a wavy, ringed and / or zigzag unit and / or pattern is defined by a complete repeating pattern present in said elastic section and / or in said undulations, waves, zigzags, etc., the pattern preferably being non-helical.

[0036] In a preferred embodiment, the cross-section of said longitudinal and / or wire element has a quadrilateral shape, for example rectangular, square and / or trapezoidal. In another embodiment, the cross-section of said longitudinal and / or wire element is circular, oval and / or ecliptic, and / or has any geometric shape.

[0037] In a preferred embodiment, said return element comprises a non-helical spring.

[0038] In a preferred embodiment, said return element forms a compression spring and / or tension spring, preferably capable of being compressed and / or stretched in the Lo direction and / or in the X direction.

[0039] In a preferred embodiment, said return element comprises an elastic section made in one piece with said at least one cooperation structure, preferably with two cooperation structures each arranged at one of the two ends of the elastic section of said return element.

[0040] In a preferred embodiment, said return element and said at least one (first) cooperation structure or, where appropriate, both (first) cooperation structures, are made in a single piece.

[0041] In a preferred embodiment, said return element comprises two ends, each of the ends being connected, provided with and / or formed of a (first) cooperation structure.

[0042] In a preferred embodiment, said (first) cooperation structures are made in one piece in and / or with said return element.

[0043] In a preferred embodiment, said recall element comprises an anchoring structure arranged to allow the attachment of said recall element to the first part.

[0044] In a preferred embodiment, said anchoring structure comprises at least one cavity and / or one hole, preferably at least one through hole and / or one blind hole.

[0045] In a preferred embodiment, said anchoring structure interrupts said elastic section and / or divides said elastic section into two partial elastic sections.

[0046] In a preferred embodiment, said return element comprises metal and / or is made of metal, said metal preferably being selected from titanium, steel, an alloy and a combination comprising one or more of the aforementioned metals and / or said alloy. Said return element may comprise and / or be made of other materials, which will be described in this description.

[0047] In another aspect, or according to a preferred embodiment, the present invention relates to a return element comprising an elastic section and at least one first cooperation structure, said elastic section and said at least one first cooperation structure being made in a single piece, and said first cooperation structure preferably being arranged to cooperate with a second cooperation structure, for example a notch, preferably a notch of a clasp and / or a link, for example of a wristwatch bracelet.

[0048] In a preferred embodiment, said component comprises several second cooperation structures, for example several notches, each of said second cooperation structures defining a predefined and / or defined cooperation position, distance or space when said first cooperation structure is in a cooperation position with at least one of said second cooperation structures, for example when the first cooperation structure is a protrusion placed in a notch.

[0049] Said second cooperation structures are preferably arranged next to each other, for example so as to be distributed along a substantially longitudinal direction and / or in a Y direction, corresponding to the longitudinal direction of the bracelet. For example, said second cooperation structures may comprise 1-10, preferably 2 to 8, more preferably 3 to 6 cooperation structures arranged next to each other. For example, the cooperation structures are notches and / or the interdental spaces of a rack

[0050] Said second cooperation structures may be arranged in pairs, one pair comprising two cooperation structures, for example two notches, arranged face to face, opposite and / or symmetrical by reflection in the component.

[0051] In a preferred embodiment, the device is arranged to be connected to a first strand of a wristwatch strap and said component is preferably arranged to be connected to a second strand of the strap of said wristwatch.

[0052] In a preferred embodiment, said device is arranged to be connected to one end of a band and the component is arranged to be connected to another end of said band or to the end of another band, preferably to the ends of the first and second strap strands of a wristwatch strap. Said first and second bands are preferably strap strands of a wristwatch or the bands of a belt.

[0053] In one aspect, the invention relates to a clasp for a belt comprising the device and / or assembly of the invention.

[0054] In one aspect, the invention relates to an assembly comprising the device according to the invention and the component comprising said one or more second cooperation structures.

[0055] In one aspect, and / or according to a preferred embodiment, the invention relates to a device for adjusting the useful length of the bracelet of a wristwatch, in which one, several or all chosen from (i) said return element, (ii) said several second cooperation structures, (iii) said mechanical device (11), and (iv) said component (12) is part of and / or is integrated into said device for adjusting the useful length of the bracelet.

[0056] In one aspect, the invention relates to a clasp comprising the mechanical device, the assembly, the return element and / or the device for adjusting the useful length of the bracelet according to the invention.

[0057] Other aspects and preferred embodiments of the invention are defined in the claims and description below. Description of the drawings

[0058] The characteristics and advantages of the invention will appear more clearly on reading a non-limiting description of some preferred embodiments. This description is given solely by way of example, with reference to the schematic figures in which: THE Figures 1A and 1B are perspective views of a clasp comprising the mechanical device according to one embodiment of the invention, in the closed position, respectively open. The Figures 2A and 2B are top views, respectively in perspective, of a return element according to an embodiment of the invention, the return element forming part of the ratchet of the clasp shown in Figures 1A and 1B . There Figure 2C is an enlargement of the extract indicated in dotted square at Figure 2A. THE Figures 3A and 3B are top views of the clasp of the Figures 1A and 1B , in the position of the minimum, respectively maximum adjusted length. The Figures 4A and 34B are longitudinal and transverse sectional views of the clasp of the Figures 1A and 1B , in the position of the minimum, respectively maximum adjusted length. The Figures 5A and 5B are longitudinal and radial sectional views of the clasp of the Figures 1A and 1B according to BB of Figures 3A and 3B , in the position of the minimum, respectively maximum adjusted (and / or set) length. The figure 6 is a top view of a return element according to another embodiment of the invention. The figure 7 , in panels AG, shows different embodiments of the recall element of the invention, in which the cooperating structure of the recall element has the different geometries. Detailed Description of Preferred Embodiments

[0059] The clasps illustrated without limitation in the figures correspond to embodiments of the present invention.

[0060] The clasp shown in the figures is a wristwatch clasp. The clasp 10 is of the folding clasp type and is intended in particular to close a watch strap. The strap can be of any type, such as for example flexible plastic, leather, fabric, or made by an assembly of links, for example metal. In the clasp shown in the figures, the strap is of the link type, for example metal links.

[0061] The clasp of the invention preferably comprises a device for finely adjusting the useful length of the bracelet. The term "useful" may indicate that the length of the bracelet strands is fixed in itself, but the device for finely adjusting the length (or hereinafter also: "the adjustment device") is arranged in the clasp in order to allow the adjustment of the circumference formed by the assembly of the first bracelet strand - watch case - second bracelet strand - clasp. The adjustment of this circumference allows for comfort by allowing a user to adjust the length of the circumference to the size of the wrist.

[0062] In general, clasps comprising a device for fine adjustment of the useful length of the bracelet comprise at least two parts arranged so as to be able to carry out a relative displacement in the longitudinal direction with respect to each other. In the clasp shown, the first part preferably corresponds to the mechanical device 11, 11' of the invention and the second preferably corresponds to the mechanical component 12, 12' of the invention.

[0063] According to the invention, the movement may be a translational movement, for example a linear movement or a movement which may follow a curve, taking into account, for example, the curvature of the blades of a wristwatch clasp. The curvature of the blades, visible at Figures 1B And 5A-5B , is lightweight and serves to allow the clasp to better fit the wrist of the wearer of the wristwatch fitted with the clasp.

[0064] The invention is not limited to a particular relative movement. In other embodiments of the invention, the relative movement between the device 11 and the component 12 may include pivoting, rotation, oscillation, uniform or non-uniform movement, translational or linear movement, or a movement combining several of the types of movements mentioned, for example.

[0065] In a preferred embodiment, the relative movement is predefined and / or guided, so as to take place along a predefined path and / or along a predefined distance. In the case where the relative movement involves a complete separation of the device and the component, at least part of the separation movement is preferably predefined and / or guided as described.

[0066] In a preferred embodiment, the device and the component each comprise and / or are each connected to a respective fastening member. A first fastening member is intended to be connected to a first bracelet strand, and the second fastening member is intended to be connected to a second bracelet strand. In this configuration, the relative movement mentioned above can be used to cause the fastening members to move closer or further apart and thus shorten or lengthen the useful length of the bracelet.

[0067] The clasp shown in the figures is a clasp 10 with three blades 1, 2, 2', comprising a central or main blade 1 and two leaflets 2, 2' each hinged to one of the two opposite ends of the central blade, as seen in the Figure 1B .

[0068] This clasp 10 is symmetrical along the longitudinal and radial plane of symmetry, but is also almost symmetrical along a transverse and radial plane of symmetry, so that the two leaflets 2 and 2' are made identically, with the exception of a few elements whose nature is essentially aesthetic, and which will be described separately. This description is thus limited to describing a single leaflet 2 and its connection to the free end of a first bracelet strand, the second leaflet 2' being made identically or correspondingly at the functional level.

[0069] The indications of the directions or orientations "longitudinal", "transverse" and "radial" are used in this description according to the practices of the person skilled in the art. More detailed definitions can be found, for example, in the international patent application WO2019166671A1, pages 9 and 10, fully incorporated in the present application by reference. In the embodiment shown in the figures, the transverse, longitudinal and radial directions correspond to the directions X, Y and Z shown in the Figure 2B , with reference to the orientation of the return element 14 when it is placed in the clasp 10, as will be described below.

[0070] As visible at the Figure 1B, the leaflet 2 comprises two lateral uprights 3, articulated at one of the two ends of the central blade 1, by means of a transverse pin 5, forming a pivot axis. The lateral uprights are also longitudinal, and their end opposite that of the connection to the central blade is articulated to a component 12, which can be considered as a cover or a frame of the clasp. The leaflet 2 also comprises a transverse spacer 6, visible at Figure 1B , this spacer being arranged to stabilize and secure the two uprights. The two uprights 3 and the spacer 6 give the leaflet 2 the general shape of a U. As better visible in the Figures 5A and 5B, the spacer 6 is arranged at the end of the leaflet 2 offset above the space occupied by the two uprights, in order to allow the clasp to be closed by placing the two uprights laterally relative to the central blade 1. In this way, the central blade and the leaflets occupy the same space in the radial direction when the clasp is closed, which makes it possible to reduce the thickness of the clasp.

[0071] The central blade 1 preferably has a transverse notch 4 in the center, sized to receive the spacers 6 of the leaflets when the clasp is closed.

[0072] As better visible to the Figures 5A and 5B , the transverse spacer 6 is in the form of a tube, with a transverse hole allowing the pin 7 to be housed which is used to pivotally articulate the component 12 to the leaflet.

[0073] When the wristwatch having clasp 10 is worn on a user's wrist and the clasp is closed as shown in Figure 1A and viewed from the outside, component 12 at least partially covers or conceals the leaflet and / or the central blade. Component 12 can also be considered a cover, for example a clasp cover.

[0074] The clasp shown in the drawings comprises a closing mechanism 23, 24 based on cooperating and / or complementary geometric shapes 23, 24 to form a clip and / or snap mechanism. This mechanism stabilizes the closed position of the clasp ( Figures 1A , 5A, 5B) while allowing the clasp to be opened by means of a force exerted by the user in the direction of unfolding the leaflet relative to the central blade. The closing is also carried out by a targeted force, exerted by the user. This force is such that it prevents in most cases the accidental opening of the clasp. This particular closing mechanism does not require a separate activation member to effect unlocking allowing the clasp to be opened. The invention is however not limited to a particular closing mechanism. For example, the clasp may also comprise an activation member, for example a pusher or a pair of pushers, in order to allow unlocking and thus opening of the clasp. Such a mechanism is described, for example, in EP0913106B1.

[0075] The operation of the opening mechanism and the design of the clasp at the central blade and the leaflets is similar to that described in patent document EP4238447 (application no. 22205832.3) in the name of the applicant and the latter's description is fully incorporated by reference and will not be described in further detail.

[0076] The clasp of the embodiment shown in the figures includes a device for fine adjustment of the useful length of the bracelet, allowing a user to adjust the watch bracelet relatively precisely to the user's wrist. This fine adjustment is more precise than the coarse adjustment of the length achieved by a clasp, for example by adding or removing a link from a link bracelet or, in a clasp of the pin buckle type, by changing the hole of the series of holes in one of the two strands in which the pin of the clasp is placed.

[0077] This adjustment device will be described with reference to the Figures 3A to 5B . This device comprises a particular return element 14, which will first be described with reference to the Figures 2A and 2B .

[0078] The return element 14 has a geometric configuration allowing it to be designated as a flat, flattened and / or special spring. In particular, the spring 14 comprises at least one elastic portion or section 18, giving the spring the elastic characteristic of a spring. As in the case of a cylindrical (helical) spring, the spring 14 comprises a wire portion 20 made of a material having elastic characteristics, such as a flexible and / or elastic metal or plastic, or another material. This is a material having elastic and / or reversible deformation, allowing it to return to an original state following deformation due to an external force. Preferably, the material has a substantially linear elasticity within the framework of a deformation exerted in the usual or intended use of the spring in the device of the invention.

[0079] In a coil spring, the wire portion is usually wound around a cylinder to form the helical elastic portion. The result is that the length of the wire forming the spring is a multiple of the length of the elastic section of the spring. Through this winding, the deformation distance of the linear elasticity can be increased and / or adjusted, allowing a coil spring to have a deformation distance long enough to allow its use in a particular application.

[0080] The restoring element of the invention has the characteristic of elastic deformation and / or has a constant of restoring and / or stiffness k, for example according to Hooke's law for springs. It should be noted that in the case of Hooke's law it is an ideal spring and that in any spring the constant k can vary depending on external conditions and other factors.

[0081] The recall element of the invention also has a wire portion 20 (the wire and / or a longitudinal portion) having a geometry characterized by a plurality of inflections and / or curvature, preferably along or around a general direction X. Preferably, these inflections and / or curvature are regular. They may also be irregular and / or have a complex regularity.

[0082] Unlike the helical spring, these inflections are not made around a cylinder, but are made in a single plane and / or along a curved surface (or following a curved surface). In other words, the wire part moves in a single plane which can be a plane itself, an inclined plane, a horizontal plane, or a curved plane (i.e. a curved surface) and not simultaneously in the three dimensions of space.

[0083] Preferably, the entire return element 14, the elastic section 18 and / or the wire portion 20 extends in a plane, lies on and / or follows a flat and / or curved surface, preferably a single continuous surface.

[0084] It should be noted that the elastic section 18 is generally defined by the wire and / or wire portion 20 of the spring, particularly as it forms repeated undulations / patterns.

[0085] As shown in the Figure 2A , the wire portion (or a wire) 20 forms curves and / or inflections along a direction X. These inflections are preferably regular, so as to create undulations, a zig-zag shape and / or a ringed shape. As is also visible in the Figure 2B , the wire portion 20 forms undulations in an X and Y direction, following a general direction X. The regular undulations do not extend in a Z direction, unlike the helical spring.

[0086] The wavy part at the Figure 2A , which provides the elastic section 18 of the return element, resembles a sinusoidal line, except that it is not limited to a particular mathematical definition in the sense that the regular curvature may have a pattern chosen according to criteria allowing the functionalities and / or the manufacture of the spring to be optimized.

[0087] As can be seen in the enlargement at Figure 2C , the wire 20 has a straight section 26 along the Y direction, followed by a curved section 27 which extends in the X and Y directions, which leads to a new straight section in the Y direction, in the opposite direction, which is followed by a new curved section 29, this time in the opposite direction. If we consider the general direction X from left to right at the Figure 2C, section 27 is a left curve and section 29 a right curve (in the opposite direction), the opposite curved sections 27, 29, together with the straight sections 26, 28 thus realizing the regular wavy pattern of the wire part along the X direction. A pattern is formed by the sections / parts 26-29, for example, or by the pattern covered by the distance 25 in the X direction, depending on where the starting point is set, as in the case of a sine or sinusoidal type line.

[0088] In the embodiment shown, sections 26 and 28 extend in the Y direction, but could also follow another direction, for example at an angle >0° (or <0°) relative to the Y direction, but preferably always in the X / Y plane, at least with regard to the regular pattern of the curvature.

[0089] As visible at the Figure 2A, the return element 14 comprises two elements or extensions 30 each linked to one of the two ends of the wire element 20. These extensions 30 comprise and / or form cooperation structures 15, which will be described below.

[0090] In one embodiment, the return element does not include one or both extensions 30, or only one extension at one end of the elastic section. Whether or not the extensions 30 are considered an integral part of the return element, the functionality of the elasticity comes from the elastic section 18 which, thanks to its geometric configuration, allows the reduction in thickness and simplification to be achieved according to the objectives of the invention.

[0091] As mentioned above, the undulations have the effect of significantly reducing the ratio of the length of the wire 20 to the length of the elastic section 18. It is this ratio which provides elasticity over a distance in the X direction long enough for the functionality of the return element 14.

[0092] In one embodiment, the return element and / or the elastic section 18 is longitudinal in the direction corresponding to the direction of the compressive and / or tensile force exerted by the return element. The return element is then distinguished from a spring formed by a folded sheet of elastic material, for example a sheet of metal folded once, twice or three times, for example.

[0093] As visible at the Figure 2B, the space occupied by the return element 14 in the Z direction, i.e. the third dimension of the X / Y / Z space, corresponds substantially to the thickness of the element 14 and / or the wire of the elastic section 18. The invention also envisages that the return element 14 is curved and / or curved in the Z direction, so that the space occupied in the Z direction is wider than the thickness of the return element in this direction. In this case, this optional curvature in the Z direction does not, however, contribute in the same way to reducing the ratio between the length of the wire 20 and the length of the elastic section.

[0094] More generally, the recall element can be curved in the Y or Z direction, for example, and does not necessarily have to follow the X direction as a straight line.

[0095] In the embodiment shown, the undulation of the return element 14 does not concern and / or does not affect or very little the extension in the Z direction. Consequently, the return element 14 occupies more space in the Y direction than in the Z direction. In other words, the width (LA) of the return element (in particular of the elastic section) is greater than its thickness (E). In the embodiment shown, the return element also occupies more space in the X direction than in the Y direction, i.e. the return element has a longitudinal shape.

[0096] In the embodiment shown, the length (Lo) of the return element and / or its elastic section is greater than the width and the thickness. It is also possible that the width (LA) of the return element is greater than its thickness (E) and greater than the length (Lo).

[0097] The above is interesting insofar as the compression and / or traction elasticity provided by the return element 14 and in particular by the elastic section 18 of the latter is obtained in the direction X and / or in the direction of Lo, that is to say the element 14 is arranged to be able to deform elastically in the direction X.

[0098] The clasp of the invention preferably comprises a device for fine adjustment of the useful length of the bracelet ("the adjustment device"). In the embodiment shown in the figures, the clasp comprises two leaflets comprising such a device, each of the two devices being able to be adjusted into one of two separate positions in the longitudinal direction. The adjustment device associated with the first leaflet 2 will be described below.

[0099] The adjustment device comprises the mechanical device 11 and the mechanical component 12, arranged so as to be able to effect a relative movement with respect to each other. Preferably, said device and component have geometric shapes and / or comprise guide elements which guide the movement in the longitudinal direction (Y) ( Fig.4A), in order to allow adjustment and / or setting of the useful length of the bracelet. This length adjustment is the consequence of the fact that the device 11 is connected to the free end of a first bracelet strand 21, and the component 12 is connected to the free end of a second bracelet strand 22. In the embodiment shown, the component 12 is hinged to the leaflet 2 which is connected to the first bracelet strand 22 via the leaflet 2, the central blade 1, the second leaflet 2' and the cover 12'. The second adjustment device (that of the second leaflet 2') is thus also included in the connection of the component 12 to the end of the second bracelet strand 22.

[0100] In the particular case of the clasp shown in the figures, the device 11 and the component 12 have shapes and / or dimensions that resemble consecutive links of a link bracelet. This particular design gives the impression of a continuous link bracelet, as seen in Figures 1A And 3A , which conceals the presence of the clasp. This concealment is reinforced by the fact that the clasp can have a reduced thickness.

[0101] The device 11, for example, comprises several main parts 8, 32, 39, made integral, for example by riveting and / or screwing. The body 8 comprises the housing 35 for the return element 14, the plate 39 makes it possible to close the housing, and the two lateral parts 32 serve to arrange a fixing member 36 and give an impression of external links of the bracelet.

[0102] In the embodiment shown, the bracelet may comprise links comprising an inner link and an outer link. The latter comprises two longitudinal parts, each of which is hinged on each of the two outer faces of the inner link, while extending beyond the inner link to be hinged to the next inner link. Overall, and seen from the outside, the inner links follow one another and the outer links follow one another in an overlapping manner.

[0103] In the clasp shown, the component 12' of the second leaflet 2' comprises an upper plate 37, arranged to be placed on a depression 38 of complementary shape ( Figure 1B ) when the clasp is closed. Plate 37, when the clasp is closed ( Figures 1A And 3A), recalls an inner link (or a part of an inner link). Then, the component of each of the leaflets recalls and resembles an outer link (or a part of an outer link) as each component 12, 12' is partially covered by the plate 37, and as each of the devices 11, 11' has a central "drawer" part, provided with a cap 39, the design of which gives an appearance of an inner link to the device 11. As shown in Figure 5B , the cover 39 can be secured or articulated, or otherwise connected, to the “drawer” part of the device 11.

[0104] As visible at the Figure 4A , the component 12 comprises a frame and / or a cover comprising side walls 31 which define between them a space 33 ( Figure 4B) in which the device 11 is guided. Each of the side walls extends in the longitudinal direction and comprises a longitudinal groove 9 in which an edge 19 arranged in each of two outer lateral flanks of the device 11 is guided, thus making it possible to guide the movement of the device 11 relative to the component 12.

[0105] On their respective inner faces, each of the side walls 31 comprises several notches 16, 17, arranged one after the other in the longitudinal direction, in order to define a series of at least two notches. Preferably, if there are more than two notches in the first part 12, they are spaced substantially equidistantly.

[0106] The invention envisages from 1 to 20, preferably from 2 to 15, for example from 3 to 10 notches and / or pairs of notches. In a preferred embodiment, the component comprises from 2 to 6 notches and / or pairs of notches.

[0107] Each of the notches is in fact present in a pair of notches 16, one notch 16 on each of the two side walls 31 of the component 12. In the present description, the reference to a notch can be understood as a reference to the two opposite notches of the pair of notches. That said, according to an embodiment not shown, the invention can also be realized with only one notch 16 on one of the two walls 31, for example, or a series of several notches arranged on one of the two walls 31. For this reason, the present invention includes the presence of one or more pairs of notches as it covers the presence of a single notch, a single series of notches (on one of two sides and / or walls), for example.

[0108] The notches 16, 17 correspond to one or more second cooperation structures, arranged to be able to cooperate with at least one first cooperation structure 15 arranged on said return element. In the present description, with reference to the figures 1 to 6 , said one or more second cooperation structures are formed by and / or correspond to the notches 16, 17.

[0109] The device 11 comprises a housing 35 which extends in the transverse direction (X) and which is open laterally. This housing is arranged to be able to accommodate the return element 14 as shown in Figure 4A and 4B .

[0110] As visible at the Figure 5A , the housing 35 is open upwards. When the return element 14 is placed in the housing, the latter can be closed by the cap 39, which in this case fulfills the function of cover of the housing and also the aesthetic function of giving the appearance of a link of a link bracelet.

[0111] The return element 14 is longitudinal and / or oblong and comprises an extension 30 at each of its two ends. Each of these extensions forms a cooperation structure 15, the shape of which is configured to allow it to cooperate with one of the notches 16, 17, located in the inner face of each of the side walls 31.

[0112] Said cooperation structure 15 corresponds to the first cooperation structure, arranged to cooperate with said second cooperation structure (the notch(s)) 16, 17. In the present description, the more general expression "cooperation structure" or "cooperating structure" is used to designate the first cooperation structure 15 according to the invention.

[0113] In the embodiment shown, the cooperation structure 15 has a half-disc shape having a curved and / or semi-circular cooperation face, for example in top view as visible in the Figure 2A The notches may preferably have a complementary hollow shape, i.e. a hollow in the form of a hollow disc and / or a hollow semicircle seen from above, as visible in the case of the pair of notches 16 at Figure 4B .

[0114] Generally, the first and second cooperation structures 15, 16, 17 preferably comprise complementary shapes, for example of the male / female, tooth / notch, partial disc / notch, plate / notch type, etc.

[0115] As visible at the Figure 4A, the two cooperating structures 15 at the end of the return element 14 are placed in the notches 16 of the component 12. Preferably, the return element 14 is in the rest position and is not subjected to a compressive and / or tensile force in this position.

[0116] The situation shown to the Figures 3A , 4A And 5A corresponds to the shortest position of the adjustment device on the bracelet. In particular, at the Figure 4A , it no longer has a free notch to the right of the notch 16 of the component 12, and the device 11 is in its maximum approach and / or insertion position relative to the component.

[0117] The elastic section 18 of the return element is preferably arranged to bias the cooperation structure 15 towards a notch 16. Preferably, this arrangement promotes and / or stabilizes a position in which said cooperation structure is placed in a notch. This stabilization preferably hinders a relative movement between the device 11 and the component 12, requiring a targeted force by the user to disengage the cooperation structure 15 from its notch, said targeted force effecting a compression of the elastic section of the return element.

[0118] A user who wishes to lengthen the bracelet can pull on the first bracelet strand 21 connected to the device 11. This tensile force will be transmitted to the return element 14. Due to the complementary and / or cooperating shapes between the notch 16 and the cooperation structure 15, the return element will be compressed and the cooperation structures are forced out of their notches 16. The traction on the bracelet strand 21 will thus force the displacement of the device 11 until the cooperation structure 15 is placed in the adjacent notch 17. Here, the return element 14 will relax and the cooperation structures will occupy at least part of the space provided by the notches 17, in order to preferably define a new position of discrete and stable length.

[0119] The discrete and stable length position may arise from a configuration in which the first and second cooperating structures are essentially complementary, so as to define said discrete position when, for example, the semicircle 17 or 17a ( Fig. 7 ) is placed in a notch 16. It is also possible to provide larger notches, for example in the form of a groove, in order to allow the first cooperation structure 15 a certain amount of play to move while remaining in a cooperation position with the second cooperation structure. In this way, the second cooperation structure can define a predefined cooperation distance or a predefined cooperation space when said first cooperation structure is in a cooperation position with at least one of said second cooperation structures.

[0120] In the clasp shown, a locking element is arranged in the device 11, arranged to abut against a stop arranged in the component, in order to prevent a movement to the left from the position shown in the Figure 4B . The locking element and the stop are not visible in the figures. There are thus two pairs of notches 16, 17 in the component 12, defining two different length positions.

[0121] It would be possible to arrange more than two pairs of notches in order to define more than two length positions per adjustment device and / or per leaflet. In the embodiment shown, the presence of two leaflets 2, 2' each provided with an adjustment device as described, generates three different length positions: the two maximum shortened and extended length positions shown in Figures 4A and 4B(3A and 3B, 5A and 5B), respectively, and an intermediate position between these two extreme positions, when only one of the two adjustment devices is in the shortened position and the other is in the extended position (not shown in the figures).

[0122] As visible to the Figures 5A and 5B , thanks to its flat and special shape, the return element 14 occupies only very little space in the radial direction. The return element 14 can thus be easily integrated into the clasp, without contributing significantly to the thickness of the clasp. It is thus possible to produce a thin clasp, having a reduced thickness.

[0123] Regardless of the reduced thickness, the return element 14 provides stability and reliability that exceeds that of a ball ratchet. Compared to prior art clasps, several ball ratchets can be replaced by the return element 14. The geometric shape of the cooperation structure can be adjusted and / or configured to different situations, which makes it possible to adjust the force required to effect the elastic deformation of the element 14 and thus to effect a displacement between two parts of a clasp.

[0124] Compared to a ball ratchet, the spring, the tube housing the spring and the ball are made into a return element 14. If we consider a twin ball ratchet, a tube, two springs and two balls are replaced by a single element and / or a single part, the return element 14. The housing 35 of the element 14 is very simple, requiring only a rectangular hollow which can be covered by a plate (e.g. the cap 39). The housing 35 could also be made in the form of a hole having a rectangular shape.

[0125] The first and second bracelet strands 21, 22 are generally connected to the clasp by means of first and second fastening members, respectively. In the clasp shown in the figures, a first fastening member is formed by or comprises the transverse hole arranged in both the device 11, and the first link 34 of the first bracelet strand 21, and the pin 36 which is arranged in these holes to pivotally connect said first link 34 to said device 11. The second fastening member is formed by or comprises the holes arranged in the device 11', and the first link 34' of the second bracelet strand 22, and the pin 36' in a similar manner.

[0126] In the embodiment shown, the return element comprises two cooperating structures 15, but it would also be possible to implement a return element having only one cooperating structure, the other end of the elastic section being occupied by an anchoring and / or fixing element, for example.

[0127] In the embodiment shown, the return element is made in one piece with the cooperation structure(s) 15. It is also possible to separate the spring function and the cooperation function into two separate pieces. In this case, the return element is preferably arranged to exert a return force on a separate piece comprising the cooperation structure. For example, the element 30 or a part thereof may be separated from a piece comprising the elastic section. The cooperation structure 15 as a separate piece is preferably also arranged on and / or in said device 11. The cooperation structure may, for example, be arranged pivotally and / or may be housed in translation or otherwise by the device 11. Preferably, the cooperation structure 15 is housed and / or arranged movably on the device 11.

[0128] The return element 14 may comprise separate elastic sections or zones 18.1, 18.2, as shown in the case of the return element 44 of the figure 6 , in which an anchoring zone 40 is arranged between two elastic sections 18.1, 18.2. The anchoring zone may comprise holes 41 for fixing the return element in the housing and / or in the device 11. Alternatively, a central zone may be provided which does not comprise holes, but which may, for example, stabilize the return element in the housing due to its dimensions and / or its geometric configuration.

[0129] The invention contemplates that the elastic section is not continuous but separated into two or more sections 18.1, 18.2, as shown in figure 6. In this case, what has been indicated at the level of the dimensions and extensions in space, concerning in particular the length (Lo), width (LA) and the thickness (E) preferably applies to the whole of the elastic section or to the whole of the return element, including the extensions 30 and the cooperation structures 15.1 and 15.2.

[0130] In one embodiment, one or both extensions 30 may be absent. If an extension 30 is absent, the corresponding cooperating structure is preferably also absent.

[0131] On the other hand, the two cooperation structures 15, and 15.1 and 15.2 may be identical, as shown, or may be different. When they are different they may, for example, have different dimensions and / or geometric shapes, adapted to the corresponding function for which they are intended.

[0132] In one embodiment, the return element 44 does not contain a second elastic section 18.2, nor a second cooperation structure 15.2. Such a return element may be adapted to cooperate with a notch of a series of notches on one side but not on the other side of the component 12.

[0133] The invention also envisages the arrangement of the return element in the component 12 and the notches in the device 11. In the context of an assembly according to the mechanical invention, the device 11 and the component 12 are arranged to move relatively to each other, preferably in the context of a planned and / or guided movement, without wishing to impose an order and / or a relative importance.

[0134] One element of the invention is the return element which is capable of replacing a ball ratchet. Therefore, the return element 14, 44 can be used in devices other than useful length adjustment devices. The return element can, for example, be used to form a ratchet of a closing mechanism of a clasp for a wristwatch.

[0135] In another embodiment, the return element is used in a connection and / or disconnection device, in which the device and component 11, 12 can be completely separated. Such a connection device can be deduced directly from the clasp shown in the figures, if one imagines that the blocking element and the stop which prevent the complete disconnection of the device and the component are absent. As mentioned above, the blocking element and the stop are not visible in the figures.

[0136] As the clasp shown in the figures suggests, the device 11 can also be implemented as and / or in the form of a link, for example a link of a link bracelet, for example for a wristwatch. The component 12 can be implemented as a following and / or preceding link of said bracelet. Thus, the device and / or component is not necessarily integrated into a clasp as shown, but can be used separately from the clasp and / or in a bracelet without a clasp.

[0137] This latter configuration is an advantage and a consequence of the possibility of reducing the extension of the recall element, for example in the Z direction at the Figure 2B in order to reduce the thickness, to have the return element in a single piece (compared to a ball ratchet), and the fact that the reliability and / or the required shape can be adjusted by means of the cooperation structure 15.

[0138] The use of a device 11 and / or the component 12 as links opens up a large number of possibilities concerning the design and / or the functionalities of a bracelet, in particular for a wristwatch. It is possible, for example, to use several assemblies 11, 12 in a bracelet, each assembly comprising a device and a component, for example arranged consecutively and / or separated by one or more conventional links. In this way the functionality of the fine adjustment of the useful length can be provided by the bracelet, in particular its links. One could also envisage the complete absence of a clasp. The bracelet can be removed from the wrist following an extension of the length of the bracelet comprising several device / component assemblies. As already mentioned, the device and the component can be arranged in such a way as to allow a complete separation, and thus provide a mechanism for opening / closing a bracelet.

[0139] In a preferred embodiment, the return element is made of and / or comprises a metal, for example steel, gold, silver, platinum, titanium and / or any alloy. In a preferred embodiment, the return element comprises and / or is made of titanium. It is also possible to make the return element so as to comprise or consist of other materials, such as plastics (polymers), ceramics, composites and / or carbon fiber, for example. Preferably, the return element comprises a material having elastic properties.

[0140] There figure 7illustrates that the cooperating structure 15 may have any shape and / or geometry, preferably adapted to its function and / or manufacturing constraints in a given configuration. In panel A, the cooperating structure 15a has a semicircle or partial circle shape as shown in the previous embodiments. In three dimensions, this shape may have a partial disc or partial sphere shape, for example. Panel B shows a cooperating structure 15b having an isosceles triangle shape. In three dimensions, this shape corresponds to a symmetrical tooth (or jaw), for example. Panel C shows a cooperating structure 15c having an isosceles trapezoid shape, also corresponding to a symmetrical tooth in three dimensions. Panel D shows a cooperating structure 15d having a triangle shape with an obtuse angle. In three dimensions, this shape corresponds to an asymmetrical tooth (or jaw), for example.Panel E shows a 15e cooperation structure having a trapezoidal shape, also corresponding to an asymmetric tooth in three dimensions.

[0141] Panel F shows a 15f cooperation structure having a triangle shape with a rounded tip. In three dimensions, this shape corresponds to a corresponding tooth (here: an asymmetric tooth).

[0142] In cases 15a to 15f, the second cooperation structure(s) preferably comprise a corresponding hollow or female structure, for example notches 16, 17, for receiving one of the first cooperation structures 15a-15f, the latter forming a protrusion. In the length adjustment device shown in the figures, this makes it possible to block or stabilize the movement of the part comprising the return element (e.g. the device 11) in at least one direction relative to the part comprising the one or more second cooperation structures (e.g. the component 12).

[0143] Of course, protrusions having different shapes from the shapes shown are also contemplated by the invention, the latter preferably not being limited to a particular shape of the first and second cooperating structures.

[0144] Panel G shows the situation of a first cooperation structure 15g having a hollow and / or female shape forming a notch. In this case, the component 12 will not comprise notches, but rather a plurality of protrusions, each of which is capable of occupying at least partially the hollow of the cooperation structure 15g in order to define a cooperation position, for example a stable and / or discreet position, for example in the case of a device for adjusting the useful length of a wristwatch bracelet clasp.

[0145] A person skilled in the art will not encounter any particular difficulty in adapting the content of the present disclosure to his own needs and implementing a clasp, a bracelet and / or a link of a bracelet, in particular for a timepiece, without departing from the scope of the present invention. It will be noted, for example, that adapting the present teaching to the construction of another type of watch clasp will not pose any particular difficulty to a person skilled in the art.

Claims

1. Mechanical device (11) for connection to a bracelet, a case and / or a clasp of a wristwatch, said device (11) comprising a return element (14) and at least one first cooperation structure (15), said at least one first cooperation structure (15) being made in one piece with said return element, or said at least one first cooperation structure (15) being arranged in the form of one or more parts separate from the return element, said return element being arranged to act on at least one separate part comprising said at least one first cooperation structure (15), characterized in that said return element (14) comprises a flat spring.

2. The mechanical device (11) according to claim 1, wherein said return element (14) comprises an elastic section (18) comprising a longitudinal and / or wire element (20) forming repeated wavy, ringed, and / or zigzag patterns (25), the return element or at least said elastic section (18) extending in a plane or on a curved surface.

3. The mechanical device according to any one of claims 1 and 2, wherein said return element (14) comprises at least one elastic section (18) which extends in a direction of space X in order to give said return element an elastic deformation property in said direction X, said elastic section (18) also extending in directions of space Y and Z, said directions X, Y, Z being perpendicular to each other, characterized in thatthe extension of the elastic section along one of the directions Y, Z is less than the extension along the other of the two directions Z, Y, respectively.

4. The mechanical device according to any one of the preceding claims, characterized in that said return element (14) comprises at least one elastic section (18), the elastic section comprising a length Lo, a width L A and a thickness E, in in that L A > E, and preferably L A >1.5 x E, and in that said return element is arranged to have elastic properties in the direction of the length Lo.

5. The mechanical device according to any one of the preceding claims, wherein said return element (14) comprises a non-helical spring.

6. The mechanical device according to any one of the preceding claims, wherein said return element (14) comprises an elastic section (18) made in one piece with said at least one first cooperation structure (15), preferably with two first cooperation structures (15) preferably each arranged at one of the two ends of said return element.

7. The mechanical device according to any one of the preceding claims, comprising a housing (35) for said return element (14), said housing constraining said return element (14) preferably to extend in an orthogonal and / or transverse direction (X) relative to the device, relative to said component (11), relative to said bracelet and / or relative to an assembly (10) comprising said device and said component (12).

8. The mechanical device (11) according to any one of the preceding claims, characterized in thatit is selected from a part of a clasp for a wristwatch strap and a link capable of being connected to or integrated into a link bracelet for a wristwatch.

9. The mechanical device (11) according to any one of the preceding claims, wherein said at least one first cooperation structure (15) comprises a protuberance in the form of a partial circle (15a), for example a semicircle, or the shape of a symmetrical (15b, 15c) or asymmetrical (15c, 15e, 15f) tooth, the shape of a rounded tooth (15f), and / or a notch (15g).

10. The mechanical device (11) according to any one of the preceding claims, wherein said at least one first cooperation structure (15) is arranged to be able to cooperate with one or more second cooperation structures (16, 17), said one or more second cooperation structures being arranged in a component (12) connected or capable of being connected to said device (11), said device (11) being arranged so as to be able to carry out a movement relative to said component (12), said at least one first cooperation structure (15) and at least one of said one or more second cooperation structures (16, 17) being arranged to define a position,a predefined distance and / or cooperation space between said mechanical device (11) and said component (12) when said at least one first cooperation structure (15) is in a cooperation position with at least one of said second cooperation structures (16)., 11. Assembly (10) comprising the device (11) according to any one of claims 1 to 10 and the component (12) comprising said one or more second cooperation structures (16, 17).

12. A return element (14) comprising at least one elastic section (18), the elastic section having a length L O , a width L A and a thickness E, in that L A > E, and preferably L A>1.5xE, said return element being arranged to have elastic properties in the direction of the length Lo, said elastic section (18) comprising a longitudinal and / or wire element (20) forming repeated wavy, ringed, and / or zigzag patterns (25), the return element or at least said elastic section (18) extending in a plane or on a curved surface.

13. The return element according to claim 12 comprising at least one first cooperation structure (15) comprising a protuberance in the form of a partial circle (15a), for example a semicircle, or the shape of a symmetrical (15b, 15c) or asymmetrical (15c, 15e, 15f) tooth, the shape of a rounded tooth (15f), and / or a notch (15g), said at least one first cooperation structure (15) being preferably arranged to be able to cooperate with one or more second cooperation structures (16, 17), said one or more second cooperation structures being preferably arranged in a component (12) separate from said return element.

14. The return element according to any one of claims 12 and 13, comprising two cooperation structures (15) each arranged at, and / or each forming, one of the two ends of said return element.

15. Clasp or link for a wristwatch strap, comprising the device according to any one of claims 1-10, the assembly according to claim 11, and / or the return element according to any one of claims 12-14.

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