EP2783592B1 - Watch strap strip - Google Patents
Watch strap strip Download PDFInfo
- Publication number
- EP2783592B1 EP2783592B1 EP14173541.5A EP14173541A EP2783592B1 EP 2783592 B1 EP2783592 B1 EP 2783592B1 EP 14173541 A EP14173541 A EP 14173541A EP 2783592 B1 EP2783592 B1 EP 2783592B1
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- EP
- European Patent Office
- Prior art keywords
- strip
- reinforcement
- blade
- strand
- fixing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C5/00—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
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- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C5/00—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
- A44C5/0053—Flexible straps
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- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C5/00—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
- A44C5/14—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps characterised by the way of fastening to a wrist-watch or the like
Definitions
- the invention relates to a reinforcement for strand wrist watch.
- the invention also relates to a strand for a bracelet comprising such a reinforcement.
- the invention further relates to a bracelet comprising at least one such strand.
- the invention finally relates to a watch comprising at least one such strand.
- document is known FR1591988 a plastic strap reinforced by a metal frame which is folded at the ends of the strand so as to form passage holes for the bars.
- This fold of the metal frame has the function of forming a passage hole for the passage of a bar or a screw for fixing the bracelet.
- the tensile strength of the bracelet is provided by the plastic material.
- Document is known AT400551 a bracelet in which, in order to increase the tensile strength of the strands without degrading its flexibility, is implemented a two-layer reinforcement, formed of a resistant thread glued to a flexible blade. This two-layer reinforcement does not improve the tensile strength at the fasteners.
- JP07329110A a resin bracelet reinforced with a nylon insert. This insert comes, in some embodiments, to wrap around the fasteners. As in the document FR1591988 , the tensile strength of the bracelet is ensured by the resin.
- the object of the invention is to provide a bracelet overcoming the disadvantages mentioned above and improving the bracelets known from the prior art.
- the invention provides a powerful and comfortable bracelet.
- the invention also proposes a watch comprising such a bracelet.
- a reinforcement according to a first aspect of the invention is defined by claim 1.
- bracelet strand according to the invention is defined by claim 12.
- a bracelet according to the invention is defined by claim 13.
- a watch according to the invention is defined by claim 14.
- the bracelet strand is of flexible type, in particular of the hybrid type, that is to say of flexible material but comprising a reinforcement.
- the bracelet strand includes a reinforcement 2 placed in an envelope of flexible material.
- the reinforcement is preferably made of a first material and the envelope 3 made of a second material.
- the first material is metallic, especially an alloy, in particular a superelastic alloy or a shape memory alloy.
- the second material is flexible. It is possible to use as second material an elastomer, such as rubber, a polymer, or leather.
- the properties of the first and second materials are distinct to better separate the stresses. It is preferably carried out a strand whose architecture is based on a central core or reinforcement and an envelope implemented around the core, that is to say at least partially embedding the core.
- the reinforcement makes it possible to ensure high mechanical strength performance of the strand, in particular with respect to tensile strength (high strength) and deformation thereof under stress (low deformation). Complementarily or alternatively, the reinforcement makes it possible to ensure high mechanical strength performance of the bending strand.
- the envelope (or coating of the strand) surrounding at least partially the reinforcement allows for it mainly to provide comfort and aesthetic functions, including allowing to obtain desired flexibility and / or desired lightness and / or a desired geometry.
- the envelope is preferably overmolded on the reinforcement, in particular when it is made of elastomeric material.
- the envelope can also be assembled by gluing and / or sewing around the reinforcement when it is made of leather.
- an opening 30 can be made in the envelope to reveal the reinforcement 2.
- the visible portion of the reinforcement can then be treated to prevent any alteration thereof.
- the opening may have an aesthetic function and / or function to reveal the technicality of the bracelet strand.
- the reinforcement comprises an element 6 for attaching the strand to the watch case and an element 5 for attaching the strand to a closure element.
- the reinforcement comprises a connecting element 4 mechanically connecting the fastening element 6 of the strand to the watch case to the fastening element 5 of the strand to a closure element.
- the element 6 for attaching the strand to the watch case comprises a tube 10 and / or the element 5 for attaching the strand to the closure element comprises a tube 9.
- the fastening element 6 from the strand to the watch case is formed by a first end of the connecting element, and / or the fastening element 5 of the strand to a closure element is formed by a second end of the connecting element.
- the reinforcement 2 mainly comprises a blade 4, in particular a metal blade, in particular a superelastic metal alloy blade.
- the element 6 fixing the strand to the watch case is intended to cooperate with a second fastener provided to secure the strand to the watch case, including the horns.
- the first and second elements constitute a fastener.
- the fastening element 5 of the strand to a closure element is intended to cooperate with a second fastening element provided for securing the strand to the closure element, which may be in particular a loop or a clasp, by example clasp folding clasp.
- the first and second elements constitute a fastener.
- the element 6 for attaching the strand to the watch case and / or the element 5 for fixing the strand to a closure element is produced by means of a tube assembled to the blade 4 by a weld or a solder 19
- the tube 9 and / or 10 may also have an excess thickness and / or a groove for receiving the end of the blade and to facilitate and / or improve the performance of the solder or solder.
- the tube shown has a groove for receiving the blade 4.
- the tubes are preferably chosen in the same material as the material of the metal blade constituting the reinforcement.
- the material of the tubes is preferably a superelastic metal alloy, more preferably the same superelastic alloy as that used for the blade, in particular a NiTi alloy.
- This advantageous combination allows a robust assembly of the tubes at the ends of the blade.
- the assembly of the tubes at the ends of the blade is preferably performed by welding, the welding being more preferably of the laser type.
- the assembly by laser welding recommended allows a localized melting of the material and thus to secure the end of the blade and the tube without external material supply, while ensuring excellent mechanical performance and good resistance to corrosion.
- the dimensions of the tubes are typically between 1 and 2.5 mm outside diameter.
- the box / strand attachment tube 10 is preferably provided with notches 101 to avoid degrading the envelope when using a bar clamp to mount the strand on the middle part.
- tubes Phynox material Nivaflex or equivalent, with the risk that the assembly of the tubes at the ends of the blade is more difficult to achieve.
- the element 6 'attaching the strand to the watch case and / or the element 5 'securing the strand to a closure element is made by folding the end of the blade 4'. Indeed, the first end is folded to form a passage 8 or a loop and a portion 20 of the end is folded over the blade 4 '. This folded portion 20 or fold is fixed on the blade, in particular by riveting. To do this, the blade and the fold have holes intended to come face to face and to receive rivets 12.
- the second end of the blade is preferably shaped in the same way to make a passage 7 or a loop , the blade and the fold have holes intended to come face to face and to receive rivets 14.
- the reinforcement In order to ensure the performance of the strand, the reinforcement must be connected to the fasteners while maintaining its performance.
- the riveted fold at each end allows to provide a passage for a bar, a screw or an axis for fixing the strand.
- a tube 10 ' can be put in place in the passage 8 and / or a tube 9' can be put in place in the passage 7 made at the other end of the reinforcement.
- the reinforcement can thus be folded around the tube or tubes.
- a bar, a screw or an axis, constituting the second fastener, is then engaged in each tube to secure the strand to the watch case or the closure member.
- the tubes 9 'and / or 10' are optional since the bars, screws or pins could directly engage in the passages 7 or 8 without the presence of a tube. However, the presence of tubes is preferred.
- the tubes are preferably chosen from Phynox material, Nivaflex, superelastic alloy or equivalent, which ensures on the one hand good mechanical performance and on the other hand a good resistance to corrosion.
- the dimensions of the tubes are typically between 1 and 2.5 mm outside diameter.
- the tube 10 'attachment box / strand is preferably provided with notches 101 to avoid degrading the envelope when using a bar clamp to mount the strand on the middle part.
- the first and second embodiments may be combined on the same reinforcement, with the first embodiment at a first end and the second embodiment at a second end.
- the reinforcement is first made to mechanically connect the fastening element of the strand to the watch case to the fastening element of the strand to the closure element.
- a mechanical action of traction of 50N, even 100N, even 200N, on the reinforcement does not make it possible to deform the reinforcement and the element of fixation, as it is the case in the prior art .
- an action mechanical traction on an axis or a bar in the tube 9 or 10 does not release the tube or the other element of the reinforcement, except breaking the reinforcement.
- the fixing elements of the fasteners are secured to the reinforcement.
- the reinforcement 2 has the main role of ensuring the mechanical strength of the strand. Given the need to have a flexible bracelet and the criterion of resistance to the various forces, the reinforcement mainly comprises a strip or a metal blade 4. In particular, the use of a superelastic metal alloy also improves the holding at the fold.
- a superelastic alloy is advantageously used for reinforcement.
- Superelasticity is manifested in some very particular alloys that show a transition between an austenitic phase and a martensitic phase.
- Superelasticity is characterized by the complete recovery of the shape of the sample when the applied stress ceases.
- martensitic transformation can be induced under stress. The stress is exerted first in the field of elastic deformation of the austenite, with a stress proportional to the deformation. Above a critical value, the austenite becomes martensite.
- Nitinol nickel and Titanium NiTi
- CuAlBe, CuAlNi or CuZnAl alloys may also be used.
- NiTi alloy reinforcement in particular that a NiTi alloy blade assembled by laser welding to NiTi alloy tubes, has excellent mechanical strength and corrosion, even in adverse cases (combination of materials favoring the equivalent of a galvanic corrosion and a prestressing of the metal blade), after two months of salt spray test.
- the blades used may have zero initial curvature and the curvature of the strand may be obtained during the molding of the envelope. It is also conceivable to give the blade an initial curvature (preform) with a suitable manufacturing process.
- the reinforcement can be dimensioned alone without regard to the envelope. It remains obvious that the addition of an envelope further improves traction.
- NIHS 92-11 states that a watch strap must be able, as shown in figure 7 , withstand a tensile force F of 200N per strand without breaking (permanent deformation is tolerated). These requirements can be increased, the breakage of the bracelet then being ensured by shear failure of the pins of bars.
- the reinforcement is then dimensioned according to the maximum tensile force F that must be able to undergo the strand without breaking, estimating the stresses equivalent to the maximum force, which must be less than the elastic limit of the material.
- F maximum tensile force
- a thickness of 0.1 mm of the blade makes it possible to obtain a limit force before plastic deformation of 440 N, which is largely above the desired values and well below the elastic limit and the breaking stress of the material.
- the thickness of the envelope can be chosen so as to optimize the resistance of the strand to folding.
- the permissible radius of curvature is 0.7 mm (by comparison, a central blade of stainless steel (type 1.4310) only tolerates a minimum bending radius of 5 mm).
- the thickness of the coating of the bracelet is then chosen so as to ensure a radius of curvature greater than the limit allowed during a fold at 180 ° of the strand.
- the NiTi alloy loses its superelastic properties below 0 ° C. Nevertheless, the alloy regains all its properties as soon as the temperature rises above this limit.
- a bent blade with a radius of 2mm at -16 ° C retains this curvature as long as the temperature is below 0 ° C, but becomes perfectly straight as soon as the temperature is higher (recovery of the form in 8s at 20 ° C).
- the superelastic alloy blade retains all its superelastic properties following a coating (overmolding conditions: typically T> 180 ° C for several minutes). This temperature behavior may vary depending on the superelastic alloy chosen. Thus, some alloys allow use at lower temperatures, but with a decrease in the maximum temperature of use.
- the blades represented at figures 2 , 3 and 7 to 11 have a complex shape, with a lateral section that varies along the strand. This allows fine adjustment of the rigidity and flexibility of the bracelet along the strand. Indeed, the flexibility of the strand varies significantly if the thickness of the strand and / or its width vary, and / or if an opening 30 is cut in the strand for reasons of aesthetics or comfort. For a strand of complex bracelet as represented in the figure 1 these variations of flexibility can interfere with the wear of the watch and can disturb its tactile appreciation.
- the approach is to compensate for the variation of the flexural modulus (Young's modulus times inertia around the neutral fiber of the metal core) of the envelope by acting on the inertia of the blade, in particular on its width.
- the objective is to ensure a predefined flexibility of the strand throughout it, in particular constant, over the entire length of the strand or, failing that, on a part of the strand, particularly near the closure element since it is in this zone that the radius of curvature of the wrist varies the most.
- the thickness of the blade does not vary along the blade.
- FIG. 9 is a section at the AA level of the figure 8
- the figure 10 is a section at the level of the plane BB of the figure 8
- the figure 11 is a section at the DC plane of the figure 8 .
- the geometries of the section of the strand are different at these three planes.
- the geometry of the section of the envelope 3 and / or the geometry of the section of the reinforcement 4 evolves along the strand.
- the section of the envelope evolves to provide aesthetic functions and the section of the reinforcement evolves to provide a mechanical function, including a mechanical function related to comfort.
- the figure 9 also shows an opening 30. This architecture makes it possible to have a constant flexibility of the strand, in particular on the part of the strand close to the closure element, and to compensate for the variations in rigidity due to the presence of an opening or, more generally due to section variations of the envelope.
- the strands with variable reinforcement section are optimized to ensure a constant rigidity throughout the strand, with a nominal value equal to 1 on the ordinate.
- the variable section of the reinforcement makes it possible to to largely compensate for the effects of sectional changes in the envelope: between points 10 and 28, the variation between the minimum and maximum stiffness values falls by more than 25% for a constant section reinforcement at 4% for a reinforcement with variable section, which is no longer noticeable.
- the abscissa points 14, 21 and 28 approximately correspond to the locations of the profiles AA, BB and CC of the Figures 8 to 11 .
- the Figures 15 to 17 show the possibilities offered by the controlled variation of the dimensions of the blade in a simpler case, and illustrate the method of dimensioning the blade.
- the bracelet strand is composed of an elastic modulus reinforcement E r and an envelope made of a module material E e .
- the flexural rigidity of a monomatiere strand is proportional to the product of the elastic modulus and the inertia of the section.
- the stiffness of the strand will be proportional, in first approximation, to (E r x I r + E e x I e ), where I r and I e represent the inertia of the cross-section of the reinforcement and the envelope, respectively.
- the variation of the inertia of the cross section of the envelope can be compensated by a a variation of the opposite sign of the inertia of the cross-section of the blade so that the sum of the bending stiffnesses is constant or substantially constant over at least a portion of the strand, for example over at least one half of the strand.
- the casing has a variable width and / or thickness along the strand
- the reinforcement has a variable width depending on the position along the strand which makes it possible to compensate for the variation of rigidity of the envelope alone.
- the figure 15 shows a strand whose envelope has a width of 16mm at one end (x-axis origin) which remains constant up to the middle of the strand, then increases linearly up to 20mm at the other end of the strand , with a constant thickness of 2.8mm.
- the figure 16 represents a constant width envelope along the strand, whose thickness is 2.8mm on the first half of the strand and increases linearly up to 3.2mm.
- the figure 17 combines the variations in width and thickness of the strands of Figures 15 and 16 .
- the thickness of the reinforcement is chosen constant at 0.1 mm, and the width at the origin is chosen at 14mm.
- the profile of the blade along the strand does not evolve in the same direction as the profile of the envelope, that is to say that the width of the blade and the width of the envelope evolve in opposite directions along the strand.
- the rates of variation of the width of the blade and the width of the envelope along the profile have opposite signs.
- the profile of the blade does not follow the profile of the envelope on at least a portion of the strand, for example on at least half of the strand. More generally, the rate of change of the value of the inertia of the cross section of the blade along the strand is opposite sign to the rate of change of the value of the inertia of the cross section of the envelope on at least a portion of the strand or reinforcement, for example on at least half of the strand.
- the value of the inertia of the cross section of the blade and the value of the inertia of the cross-section of the envelope move in opposite directions on at least a part of the strand or the reinforcement, for example on at least half of the strand.
- the rate of change of the thickness value of the blade along the strand may be of opposite sign to the rate of change of the thickness value of the envelope on at least a portion of the strand or reinforcement, for example on at least half of the strand.
- the thickness value of the blade and the thickness value of the envelope can evolve in opposite directions on at least a portion of the strand or reinforcement, for example on at least half of the strand.
- the rate of change of the width value of the blade along the strand is of opposite sign to the rate of change of the thickness value of the envelope on at least a portion of the strand or reinforcement, for example on at least half of the strand.
- the width value of the blade and the thickness value of the envelope move in opposite directions on at least a portion of the strand or reinforcement, for example on at least half of the strand.
- figure 17 should be considered with caution as the reinforcement section is probably too weak at the widest end of the envelope to provide the desired mechanical performance.
- a desired profile of flexibility of the strand along this strand can be obtained, in particular a constant profile over a part of the length of the strand. strand, even over the entire length of the strand.
- variable width reinforcement makes it possible to compensate for the effect of the external geometry of the strand. It can even significantly reduce the effect due to the presence of a reinforcement extending under the lower plane of the strand, such as a comfort cushion.
- the winding zone of the strand around the wrist can then have a quasi-constant flexibility and provide a comfort to wear significantly increased.
- the reinforcement thus has a cross section whose geometry, in particular the width of the cross section, evolves along the strand so that the bending rigidity of the strand, along the strand, has a determined profile, in particular a profile. constant on at least a portion of the strand, for example on at least half of the strand, for example on half of the strand close to the closure element.
- Constant profile means that the bending rigidity of the strand does not vary by more than 20% of a nominal value, or even preferably does not vary by more than 10% of the nominal value, or ideally does not vary. more than 5% of the nominal value.
- the strand has been previously described applied to a bracelet comprising two strands and a clasp.
- the strand comprises a reinforcement extending from the attachment of the box to the clasp fastener.
- the strand may thus comprise a reinforcement extending from the fastener of the box to the fastener of the buckle or a reinforcement extending from the fastener of the box to the pin holes.
- a reinforcement 2; 2 'strand 1 watch strap to be housed in a wrapper 3 of strand of flexible material comprises a blade made of superelastic alloy, the blade extending from an element 10; 6; 10 '; 6 'fixing the strand to a watch case to an element 9; 5; 9 '; 5 'fixing the strand to a closure element.
Landscapes
- Adornments (AREA)
- Clamps And Clips (AREA)
- Buckles (AREA)
- Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
Description
L'invention concerne un renfort pour brin de bracelet de montre. L'invention concerne aussi un brin pour bracelet comprenant un tel renfort. L'invention concerne encore un bracelet comprenant au moins un tel brin. L'invention concerne enfin une montre comprenant au moins un tel brin.The invention relates to a reinforcement for strand wrist watch. The invention also relates to a strand for a bracelet comprising such a reinforcement. The invention further relates to a bracelet comprising at least one such strand. The invention finally relates to a watch comprising at least one such strand.
De nombreux bracelets de montre souples existent sur le marché, notamment en cuir, en élastomère ou en thermoplastique-élastomère. Cependant, la durabilité et les performances de ce type de bracelets ne sont pas toujours satisfaisantes en comparaison aux performances d'un bracelet à maillons métalliques.Many flexible watchbands exist on the market, including leather, elastomer or thermoplastic elastomer. However, the durability and performance of this type of bracelets are not always satisfactory compared to the performance of a metal link bracelet.
Pour résoudre ces problèmes, il a été envisagé de réaliser des bracelets de type hybride, c'est-à-dire des bracelets souples présentant des renforts. On connaît du document
On connaît par exemple du document
On connaît du document
On connaît du document
On connaît du document
De nombreux modèles et concepts de bracelets souples ont été décrits et présentés. Néanmoins, les bracelets souples connus sont tous assez peu performants mécaniquement, notamment au niveau de la résistance des brins en traction. Il est donc nécessaire de faire un choix entre un bracelet souple en cuir ou en élastomère qui soit confortable et un bracelet métallique performant mécaniquement. Les bracelets souples sont notamment invariablement moins robustes que des bracelets métalliques, par exemple au niveau de la tenue en traction ou de la tenue au pliage.Many models and concepts of flexible bracelets have been described and presented. Nevertheless, the known flexible bracelets are all quite mechanically inefficient, particularly in terms of the resistance of the strands in traction. It is therefore necessary to make a choice between a flexible leather or elastomer strap that is comfortable and a mechanically performing metal bracelet. Flexible bracelets are in particular invariably less robust than metal bracelets, for example in terms of tensile strength or folding resistance.
Aussi, le but de l'invention est de fournir un bracelet remédiant aux inconvénients évoqués précédemment et améliorant les bracelets connus de l'art antérieur. En particulier, l'invention propose un bracelet performant et confortable. L'invention propose également une montre comprenant un tel bracelet.Also, the object of the invention is to provide a bracelet overcoming the disadvantages mentioned above and improving the bracelets known from the prior art. In particular, the invention provides a powerful and comfortable bracelet. The invention also proposes a watch comprising such a bracelet.
Un renfort selon un premier aspect de l'invention est défini par la revendication 1.A reinforcement according to a first aspect of the invention is defined by
Différents modes de réalisation du renfort selon l'invention sont définis par les revendications 2 à 10.
Un brin de bracelet selon l'invention est défini par la revendication 11.Different embodiments of the reinforcement according to the invention are defined by
A bracelet strand according to the invention is defined by claim 11.
Un mode de réalisation du brin de bracelet selon l'invention est défini par la revendication 12.
Un bracelet selon l'invention est défini par la revendication 13.One embodiment of the bracelet strand according to the invention is defined by
A bracelet according to the invention is defined by claim 13.
Une montre selon l'invention est définie par la revendication 14.A watch according to the invention is defined by
Le dessin annexé représente, à titre d'exemples non-limitatifs, deux modes de réalisation d'un bracelet selon l'invention.
- La
figure 1 est une vue en perspective d'un mode de réalisation d'un brin de bracelet selon l'invention. - La
figure 2 est une vue éclatée d'un mode de réalisation du brin de bracelet selon l'invention, illustrant également un premier mode de réalisation du renfort utilisé dans le mode de réalisation du brin de bracelet selon l'invention. - La
figure 3 est une vue en perspective d'un deuxième mode de réalisation de renfort utilisé dans un mode de réalisation du brin de bracelet selon l'invention. - La
figure 4 représente une vue d'un mode de réalisation d'un tube utilisé dans un mode de réalisation du brin de bracelet selon l'invention au niveau de l'attache à la boîte de montre. - La
figure 5 est une vue d'un mode de réalisation d'un tube utilisé dans un mode de réalisation du brin de bracelet selon l'invention au niveau de l'attache à un élément de fermeture. - La
figure 6 est une vue en coupe partielle d'une extrémité du renfort selon le deuxième mode de réalisation de renfort selon l'invention. - La
figure 7 est une vue en perspective du premier mode de réalisation de renfort utilisé dans un mode de réalisation du brin de bracelet selon l'invention. - La
figure 8 est une vue en coupe longitudinale du premier mode de réalisation de renfort utilisé dans un mode de réalisation du brin de bracelet selon l'invention. - Les
figures 9 à 11 sont des vues en coupes transversales du mode de réalisation de renfort utilisé dans le mode de réalisation du brin de bracelet selon l'invention illustré à lafigure 8 . - Les
figures 12 et 13 sont des vues en coupe partielle d'une extrémité de deux variantes du premier mode de réalisation de renfort selon l'invention illustrée à lafigure 2 . - La
figure 14 est un graphique représentant les variations de rigidité en flexion de différents modes de réalisation de brins de bracelet selon l'invention. - Les
figures 15 à 17 sont des graphiques représentant les variations de largeur du renfort (trait brisé) pour obtenir une rigidité constante le long du brin et compenser ainsi les variations de largeur du brin (trait plein,figures 15 et 17 ) ou d'épaisseur du brin (non représenté,figures 16 et 17 ). Les figures correspondent à une vue de dessus de la forme du brin, les échelles étant graduées en [mm].
- The
figure 1 is a perspective view of an embodiment of a bracelet strand according to the invention. - The
figure 2 is an exploded view of an embodiment of the bracelet strand according to the invention, also illustrating a first embodiment of the reinforcement used in the embodiment of the bracelet strand according to the invention. - The
figure 3 is a perspective view of a second embodiment of reinforcement used in one embodiment of the bracelet strand according to the invention. - The
figure 4 represents a view of an embodiment of a tube used in one embodiment of the bracelet strand according to the invention at the attachment to the watch case. - The
figure 5 is a view of an embodiment of a tube used in one embodiment of the bracelet strand according to the invention at the fastener to a closure member. - The
figure 6 is a partial sectional view of one end of the reinforcement according to the second embodiment of reinforcement according to the invention. - The
figure 7 is a perspective view of the first embodiment of reinforcement used in one embodiment of the bracelet strand according to the invention. - The
figure 8 is a longitudinal sectional view of the first embodiment of reinforcement used in one embodiment of the bracelet strand according to the invention. - The
Figures 9 to 11 are cross-sectional views of the reinforcement embodiment used in the embodiment of the wristband strand according to the invention illustrated in FIG.figure 8 . - The
Figures 12 and 13 are partial sectional views of one end of two variants of the first embodiment of reinforcement according to the invention illustrated in FIG.figure 2 . - The
figure 14 is a graph showing flexural stiffness variations of different embodiments of bracelet strands according to the invention. - The
Figures 15 to 17 are graphs representing the width variations of the reinforcement (broken line) to obtain a constant rigidity along the strand and thus to compensate the variations of width of the strand (solid line,Figures 15 and 17 ) or thickness of the strand (not shown,Figures 16 and 17 ). The figures correspond to a top view of the shape of the strand, the scales being graduated in [mm].
Un mode de réalisation d'un brin 1 de bracelet selon l'invention est décrit ci-après en référence aux
Le brin de bracelet comprend un renfort 2 mis en place dans une enveloppe en matériau souple. Le renfort est de préférence réalisé en un premier matériau et l'enveloppe 3 réalisée en un deuxième matériau. Par exemple, le premier matériau est métallique, notamment un alliage, en particulier un alliage superélastique ou un alliage à mémoire de forme. Le deuxième matériau est souple. On peut notamment utiliser comme deuxième matériau un élastomère, comme du caoutchouc, un polymère, ou du cuir.The bracelet strand includes a
Les propriétés des premier et deuxième matériaux sont distinctes pour séparer au mieux les contraintes. On réalise de préférence un brin dont l'architecture est basée sur une âme centrale ou renfort et une enveloppe mise en oeuvre autour de l'âme, c'est-à-dire enrobant au moins partiellement l'âme. Le renfort permet d'assurer de hautes performances de résistance mécanique du brin, notamment en tenue à la traction (haute résistance) et en déformation de celui-ci sous contrainte (faible déformation). Complémentairement ou alternativement, le renfort permet d'assurer de hautes performances de résistance mécanique du brin au pliage. L'enveloppe (ou enrobage du brin) entourant au moins partiellement le renfort permet quant à elle d'assurer principalement des fonctions de confort et d'esthétique, notamment en permettant d'obtenir une souplesse désirée et/ou une légèreté désirée et/ou une géométrie désirée. L'enveloppe est préférentiellement surmoulée sur le renfort, notamment lorsqu'elle est réalisée en matériau élastomère. L'enveloppe peut être aussi assemblée par collage et/ou par couture autour du renfort lorsqu'elle est réalisée en cuir.The properties of the first and second materials are distinct to better separate the stresses. It is preferably carried out a strand whose architecture is based on a central core or reinforcement and an envelope implemented around the core, that is to say at least partially embedding the core. The reinforcement makes it possible to ensure high mechanical strength performance of the strand, in particular with respect to tensile strength (high strength) and deformation thereof under stress (low deformation). Complementarily or alternatively, the reinforcement makes it possible to ensure high mechanical strength performance of the bending strand. The envelope (or coating of the strand) surrounding at least partially the reinforcement allows for it mainly to provide comfort and aesthetic functions, including allowing to obtain desired flexibility and / or desired lightness and / or a desired geometry. The envelope is preferably overmolded on the reinforcement, in particular when it is made of elastomeric material. The envelope can also be assembled by gluing and / or sewing around the reinforcement when it is made of leather.
Dans les deux cas, une ouverture 30 peut être pratiquée dans l'enveloppe afin de laisser apparaître le renfort 2. La partie apparente du renfort peut alors être traitée pour éviter toute altération de celui-ci. L'ouverture peut avoir une fonction esthétique et/ou la fonction de dévoiler la technicité du brin de bracelet.In both cases, an
Le renfort comprend un élément 6 de fixation du brin à la boîte de montre et un élément 5 de fixation du brin à un élément de fermeture. Le renfort comprend un élément de liaison 4 reliant mécaniquement l'élément 6 de fixation du brin à la boîte de montre à l'élément 5 de fixation du brin à un élément de fermeture. De préférence, l'élément 6 de fixation du brin à la boîte de montre comprend un tube 10 et/ou l'élément 5 de fixation du brin à l'élément de fermeture comprend un tube 9. Alternativement, l'élément 6 de fixation du brin à la boîte de montre est réalisé par une première extrémité de l'élément de liaison, et/ou l'élément 5 de fixation du brin à un élément de fermeture est réalisé par une deuxième extrémité de l'élément de liaison. Le renfort 2 comprend principalement une lame 4, notamment une lame métallique, en particulier une lame en alliage métallique superélastique.The reinforcement comprises an
L'élément 6 de fixation du brin à la boîte de montre est destiné à coopérer avec un deuxième élément de fixation prévu pour solidariser le brin à la boîte de montre, notamment aux cornes. Les premier et deuxième éléments constituent une attache. De manière similaire, l'élément 5 de fixation du brin à un élément de fermeture est destiné à coopérer avec un deuxième élément de fixation prévu pour solidariser le brin à l'élément de fermeture, qui peut être notamment une boucle ou un fermoir, par exemple un fermoir à boucle déployante. Les premier et deuxième éléments constituent une attache.The
Comme représenté notamment aux
Une barrette, une vis ou un axe, constituant le deuxième élément de fixation, est ensuite engagé dans chaque tube 9 et/ou 10 pour fixer le brin à la boîte de montre ou à l'élément de fermeture.A bar, a screw or an axis, constituting the second fastening element, is then engaged in each
La présence des tubes 9 et 10 permet principalement de rendre solidaire les deux extrémités du renfort avec les deuxièmes éléments de fixation, et ainsi de reprendre de façon optimale les efforts en traction. Ces tubes apportent trois avantages supplémentaires :
- faciliter la mise en place dans un moule dans le cas où l'enveloppe est moulée ultérieurement sur le renfort ;
- faciliter l'introduction de la barrette, vis ou axe ; il est en effet aisé d'enfiler une tige dans un tube parfaitement circulaire;
- maîtriser précisément la longueur du brin, soit la distance (entraxe) entre les deux axes des attaches brin/fermoir et brin/boîte.
- facilitate placement in a mold in the case where the envelope is molded later on the reinforcement;
- facilitate the introduction of the bar, screw or axis; it is indeed easy to put a rod in a perfectly circular tube;
- to precisely control the length of the strand, ie the distance (spacing) between the two axes of the strand / clasp fasteners and strand / box.
Les tubes sont choisis préférentiellement en même matière que la matière de la lame métallique constituant le renfort. En particulier, quand la matière de la lame est un alliage métallique superélastique, notamment un alliage NiTi, la matière des tubes est préférentiellement un alliage métallique superélastique, plus préférentiellement le même alliage superélastique que celui utilisé pour la lame, notamment un alliage NiTi. Cette combinaison avantageuse permet un assemblage robuste des tubes aux extrémités de la lame. L'assemblage des tubes aux extrémités de la lame est réalisé préférentiellement par soudage, le soudage étant plus préférentiellement du type laser. L'assemblage par soudage laser préconisé permet une fusion localisée de la matière et donc de solidariser l'extrémité de la lame et le tube, sans apport extérieur de matière, tout en assurant d'excellentes performances mécaniques et une bonne tenue à la corrosion. Les dimensions des tubes sont typiquement comprises entre 1 et 2.5 mm de diamètre extérieur. Le tube 10 d'attache boîte/brin est muni préférentiellement d'encoches 101 pour éviter de dégrader l'enveloppe lors de l'utilisation d'une pince à barrette pour monter le brin sur la carrure.The tubes are preferably chosen in the same material as the material of the metal blade constituting the reinforcement. In particular, when the material of the blade is a superelastic metal alloy, especially a NiTi alloy, the material of the tubes is preferably a superelastic metal alloy, more preferably the same superelastic alloy as that used for the blade, in particular a NiTi alloy. This advantageous combination allows a robust assembly of the tubes at the ends of the blade. The assembly of the tubes at the ends of the blade is preferably performed by welding, the welding being more preferably of the laser type. The assembly by laser welding recommended allows a localized melting of the material and thus to secure the end of the blade and the tube without external material supply, while ensuring excellent mechanical performance and good resistance to corrosion. The dimensions of the tubes are typically between 1 and 2.5 mm outside diameter. The box /
Alternativement, on pourrait aussi utiliser des tubes en matière Phynox, Nivaflex ou équivalente, avec le risque que l'assemblage des tubes aux extrémités de la lame soit plus difficile à réaliser.Alternatively, one could also use tubes Phynox material, Nivaflex or equivalent, with the risk that the assembly of the tubes at the ends of the blade is more difficult to achieve.
On peut aussi réduire le passage de la pince à barrette au strict minimum et jouer sur l'élasticité de l'enveloppe pour comprimer la barrette. Dans ce cas, le tube 10 d'attache à la boîte de montre doit être bien plus court pour autoriser cette compression.We can also reduce the passage of the bar clamp to a minimum and play on the elasticity of the envelope to compress the bar. In this case, the tube attachment to the watch case must be much shorter to allow this compression.
Dans un deuxième mode de réalisation de renfort 2' représenté aux
Dans le but d'assurer la performance du brin, le renfort doit être relié aux attaches en conservant au mieux ses performances. Le repli riveté à chaque extrémité permet de ménager un passage pour une barrette, une vis ou un axe destiné à la fixation du brin.In order to ensure the performance of the strand, the reinforcement must be connected to the fasteners while maintaining its performance. The riveted fold at each end allows to provide a passage for a bar, a screw or an axis for fixing the strand.
Avantageusement, comme représenté aux
Les tubes sont choisis préférentiellement en matière Phynox, Nivaflex, alliage superélastique ou équivalente, qui permet d'assurer d'une part de bonnes performances mécaniques et d'autre part une bonne tenue à la corrosion. Les dimensions des tubes sont typiquement comprises entre 1 et 2.5 mm de diamètre extérieur. Le tube 10' d'attache boîte/brin est muni préférentiellement d'encoches 101 pour éviter de dégrader l'enveloppe lors de l'utilisation d'une pince à barrette pour monter le brin sur la carrure.The tubes are preferably chosen from Phynox material, Nivaflex, superelastic alloy or equivalent, which ensures on the one hand good mechanical performance and on the other hand a good resistance to corrosion. The dimensions of the tubes are typically between 1 and 2.5 mm outside diameter. The tube 10 'attachment box / strand is preferably provided with
Des essais ont montré qu'un rivet en laiton ou en acier inoxydable convient parfaitement à l'application souhaitée. D'autres alternatives au rivetage sont envisageables pour atteindre les performances souhaitées. Par exemple, il est possible d'agrafer le repli 20 au reste de la lame. Il est également possible de souder le repli 20 au reste de la lame, réalisée par exemple à l'extrémité du repli 20. Dans ce cas, le soudage peut être préférentiellement du type laser. Il est aussi possible de fixer le repli 20 au reste de la lame par vissage. Dans ce cas, on utilise des boulons en lieu et place des rivets.Tests have shown that a brass or stainless steel rivet is ideal for the desired application. Other alternatives to riveting are conceivable to achieve the desired performance. For example, it is possible to staple the
Les premier et deuxième modes de réalisation peuvent être combinés sur un même renfort, avec le premier mode de réalisation à une première extrémité et le deuxième mode de réalisation à une deuxième extrémité.The first and second embodiments may be combined on the same reinforcement, with the first embodiment at a first end and the second embodiment at a second end.
A noter que les solutions connues de l'état de l'art ne sont pas satisfaisantes. Un simple pli comme dans le document
Dans l'invention, on réalise d'abord le renfort qui permet de relier mécaniquement l'élément de fixation du brin à la boîte de montre à l'élément de fixation du brin à l'élément de fermeture. Ainsi, à ce stade de réalisation, une action mécanique de traction de 50N, voire 100N, voire 200N, sur le renfort ne permet pas de déformer le renfort et l'élément de fixation, comme c'est le cas dans l'art antérieur. En particulier, une action mécanique de traction sur un axe ou une barrette se trouvant dans le tube 9 ou 10 ne permet pas de libérer le tube ou l'autre élément du renfort, sauf à rompre le renfort. Ainsi, dans les modes de réalisation décrits, les éléments de fixation des attaches (permettant la fixation à la boîte ou au fermoir) sont solidarisés au renfort.In the invention, the reinforcement is first made to mechanically connect the fastening element of the strand to the watch case to the fastening element of the strand to the closure element. Thus, at this stage of realization, a mechanical action of traction of 50N, even 100N, even 200N, on the reinforcement does not make it possible to deform the reinforcement and the element of fixation, as it is the case in the prior art . In particular, an action mechanical traction on an axis or a bar in the
Le renfort 2 a pour rôle principal d'assurer la tenue mécanique du brin. Compte tenu de la nécessité d'avoir un bracelet souple et du critère de tenue aux différents efforts, le renfort comprend principalement un feuillard ou une lame métallique 4. En particulier, l'utilisation d'un alliage métallique superélastique permet aussi d'améliorer la tenue au pliage.The
Pour garantir que de fortes déformations du brin ne provoquent pas de déformation permanente, par exemple lors d'un repli à 180° du brin sur lui-même, un alliage superélastique est avantageusement utilisé pour le renfort. La superélasticité se manifeste dans certains alliages très particuliers qui montrent une transition entre une phase austénitique et une phase martensitique. La superélasticité est caractérisée par la récupération complète de la forme de l'échantillon lorsque la contrainte appliquée cesse. Dans le domaine de température où l'austénite est stable, la transformation martensitique peut être provoquée sous contrainte. La contrainte s'exerce d'abord dans le domaine de déformation élastique de l'austénite, avec une contrainte proportionnelle à la déformation. Au dessus d'une valeur critique, l'austénite se transforme en martensite. Quand la contrainte cesse, il y a réversion totale de la martensite vers l'austénite jusqu'à une déformation nulle puisque, à la température de sollicitation, c'est la structure austénite qui est stable. Le grand intérêt de cette propriété est la grande possibilité de déformation dans un domaine « élastique » alors que la contrainte varie. L'élasticité de ces alliages peut atteindre dix fois celle de l'acier.To ensure that strong deformations of the strand do not cause permanent deformation, for example during a 180 ° fold of the strand on itself, a superelastic alloy is advantageously used for reinforcement. Superelasticity is manifested in some very particular alloys that show a transition between an austenitic phase and a martensitic phase. Superelasticity is characterized by the complete recovery of the shape of the sample when the applied stress ceases. In the temperature domain where the austenite is stable, martensitic transformation can be induced under stress. The stress is exerted first in the field of elastic deformation of the austenite, with a stress proportional to the deformation. Above a critical value, the austenite becomes martensite. When the stress ceases, there is total reversion of the martensite towards the austenite until a zero deformation since, at the stressing temperature, it is the austenite structure which is stable. The great interest of this property is the great possibility of deformation in an "elastic" domain whereas the stress varies. The elasticity of these alloys can reach ten times that of steel.
Il existe plusieurs alliages aux propriétés superélastiques. On peut utiliser par exemple un alliage à base de Nickel et de Titane NiTi (nom commercial Nitinol), principalement parce que cet alliage montre une excellente résistance à la corrosion et est biocompatible. D'autres alliages superélastiques, comme les alliages CuAlBe, CuAINi ou CuZnAl, peuvent également être utilisés.There are several alloys with superelastic properties. For example, an alloy based on Nickel and Titanium NiTi (trade name Nitinol) can be used, mainly because this alloy exhibits excellent resistance to corrosion and is biocompatible. Other superelastic alloys, such as CuAlBe, CuAlNi or CuZnAl alloys, may also be used.
Les essais ont confirmé que le renfort en alliage NiTi, en particulier qu'une lame en alliage NiTi assemblé par soudage laser aux tubes en alliage NiTi, a une excellente tenue mécanique et à la corrosion, même dans des cas défavorables (association de matériaux favorisant l'équivalent d'une corrosion galvanique et d'une précontrainte de la lame métallique), et ce après deux mois de test en brouillard salin.The tests confirmed that the NiTi alloy reinforcement, in particular that a NiTi alloy blade assembled by laser welding to NiTi alloy tubes, has excellent mechanical strength and corrosion, even in adverse cases (combination of materials favoring the equivalent of a galvanic corrosion and a prestressing of the metal blade), after two months of salt spray test.
Les lames utilisées peuvent présenter une courbure initiale nulle et la courbure du brin peut être obtenue lors du moulage de l'enveloppe. Il est également envisageable de donner à la lame une courbure initiale (préforme) avec un procédé de fabrication adéquat.The blades used may have zero initial curvature and the curvature of the strand may be obtained during the molding of the envelope. It is also conceivable to give the blade an initial curvature (preform) with a suitable manufacturing process.
Comme l'invention permet de découpler ou plutôt de limiter le couplage existant entre les fonctions « tenue mécanique » et « aspect esthétique/confort », le renfort peut être dimensionné seul sans tenir compte de l'enveloppe. Il reste évident que l'ajout d'une enveloppe améliore encore la tenue à la traction.As the invention makes it possible to decouple or rather to limit the coupling existing between the "mechanical strength" and "aesthetic appearance / comfort" functions, the reinforcement can be dimensioned alone without regard to the envelope. It remains obvious that the addition of an envelope further improves traction.
La norme NIHS 92-11 stipule qu'un bracelet de montre doit pouvoir, comme représenté à la
Le renfort est ensuite dimensionné en fonction de l'effort de traction F maximal que doit pouvoir subir le brin sans rupture, en estimant les contraintes équivalentes à l'effort maximal, qui doivent être inférieures à la limite élastique du matériau. Pour les dimensions utilisées dans le cadre des essais, avec une largeur minimale de 7.4mm, une épaisseur de 0.1 mm de la lame permet d'obtenir une force limite avant déformation plastique de 440N, soit largement en dessus des valeurs souhaitées et largement en deçà de la limite élastique et de la contrainte à rupture du matériau.The reinforcement is then dimensioned according to the maximum tensile force F that must be able to undergo the strand without breaking, estimating the stresses equivalent to the maximum force, which must be less than the elastic limit of the material. For the dimensions used in the tests, with a minimum width of 7.4 mm, a thickness of 0.1 mm of the blade makes it possible to obtain a limit force before plastic deformation of 440 N, which is largely above the desired values and well below the elastic limit and the breaking stress of the material.
De plus, les simulations et les tests ont montré que les concentrations de contraintes générées aux abords des soudures ou des rivets restent en deçà de la contrainte limite de plastification, même pour une force en traction appliquée supérieure à 300N. Les tests ont aussi montré qu'une telle configuration permet un niveau de performance largement suffisant pour répondre aux exigences de la norme NIHS 92-11, qui précise les valeurs seuil de tenue à la traction. Les tenues en déviation latérale et en traction sont également dans les critères admis.In addition, simulations and tests have shown that the stress concentrations generated around welds or rivets remain below the limiting plasticizing stress, even for applied tensile force greater than 300N. Testing has also shown that such a configuration provides a level of performance that is largely sufficient to meet the requirements of NIHS 92-11, which specifies tensile strength thresholds. Outfits in lateral deviation and traction are also within the accepted criteria.
De plus, l'épaisseur de l'enveloppe peut être choisie de façon à optimiser la résistance du brin au pliage. Pour une épaisseur de lame de 0.1 mm, le rayon de courbure admissible est de 0.7mm (par comparaison, une lame centrale en acier inoxydable (type 1.4310) ne tolère qu'un rayon de courbure minimum de 5mm seulement). L'épaisseur de l'enrobage du bracelet est alors choisie de manière à assurer un rayon de courbure supérieur à la limite admise lors d'un pli à 180° du brin.In addition, the thickness of the envelope can be chosen so as to optimize the resistance of the strand to folding. For a blade thickness of 0.1 mm, the permissible radius of curvature is 0.7 mm (by comparison, a central blade of stainless steel (type 1.4310) only tolerates a minimum bending radius of 5 mm). The thickness of the coating of the bracelet is then chosen so as to ensure a radius of curvature greater than the limit allowed during a fold at 180 ° of the strand.
L'alliage NiTi perd ses propriétés superélastiques en dessous de 0°C. Néanmoins, l'alliage retrouve toutes ses propriétés dès que la température repasse en dessus de cette limite. Ainsi, une lame pliée avec un rayon de 2mm à -16°C conserve cette courbure tant que la température est inférieure à 0°C, mais redevient parfaitement droite dès que la température est supérieure (reprise de la forme en 8s à 20°C). De même, la lame en alliage superélastique conserve toutes ses propriétés superélastiques suite à un enrobage (conditions de surmoulage : typiquement T > 180°C pendant plusieurs minutes). Ce comportement en température peut varier en fonction de l'alliage superélastique choisi. Ainsi, certains alliages permettent une utilisation à plus basse température, mais avec une diminution de la température maximale d'utilisation.The NiTi alloy loses its superelastic properties below 0 ° C. Nevertheless, the alloy regains all its properties as soon as the temperature rises above this limit. Thus, a bent blade with a radius of 2mm at -16 ° C retains this curvature as long as the temperature is below 0 ° C, but becomes perfectly straight as soon as the temperature is higher (recovery of the form in 8s at 20 ° C). Similarly, the superelastic alloy blade retains all its superelastic properties following a coating (overmolding conditions: typically T> 180 ° C for several minutes). This temperature behavior may vary depending on the superelastic alloy chosen. Thus, some alloys allow use at lower temperatures, but with a decrease in the maximum temperature of use.
Les lames représentées aux
Pour illustrer ceci sur une géométrie d'enveloppe complexe, on se reporte aux
Grâce à une telle architecture, en particulier grâce à la variation de la section du renfort le long du brin, on peut obtenir un profil désiré de souplesse du brin le long de celui-ci. Les graphes de la
- un brin de 57.5 mm de longueur avec un renfort à section constante (I=57.5, cst),
- un brin de 57.5 mm de longueur avec un renfort à section variable (I=57.5, var),
- un brin de 71.5 mm de longueur avec un renfort à section constante (I=71.5, est),
- un brin de 71.5 mm de longueur avec un renfort à section variable (I=71.5, var).
- a strand of 57.5 mm in length with a constant section reinforcement (I = 57.5, cst),
- a strand of 57.5 mm in length with a variable section reinforcement (I = 57.5, var),
- a length of 71.5 mm in length with a constant section reinforcement (I = 71.5, east),
- one strand 71.5 mm long with a variable section reinforcement (I = 71.5, var).
Les brins à section de renfort variable sont optimisés pour assurer une rigidité constante tout au long du brin, avec une valeur nominale égale à 1 sur l'ordonnée. On voit que la section variable du renfort permet de compenser en très grande partie les effets des variations de section de l'enveloppe : entre les points 10 et 28, la variation entre les valeurs minimales et maximales de rigidité tombe de plus de 25% pour un renfort à section constante à 4% pour un renfort à section variable, ce qui n'est plus perceptible. Sur le graphe de la
Les
Ainsi, pour déterminer une géométrie de brin de bracelet, en particulier pour déterminer une géométrie de renfort, notamment pour déterminer la largeur et/ou l'épaisseur du renfort de brin de bracelet, on peut procéder selon les étapes suivantes :
- Définir un profil d'évolution de la rigidité à la flexion du brin le long du brin ;
- Définir un matériau d'enveloppe et les dimensions de cette enveloppe ;
- Choisir l'épaisseur du renfort, respectivement la largeur du renfort ;
- Calculer la largeur du renfort, respectivement l'épaisseur du renfort de sorte que la rigidité à la flexion du brin le long du brin évolue selon le profil déterminé.
- Define a profile of the evolution of the bending rigidity of the strand along the strand;
- Define an envelope material and the dimensions of this envelope;
- Choose the thickness of the reinforcement, respectively the width of the reinforcement;
- Calculate the width of the reinforcement, respectively the thickness of the reinforcement so that the bending stiffness of the strand along the strand evolves according to the determined profile.
Dans les exemples des
Dans tous les cas, le profil de la lame le long du brin n'évolue pas dans le même sens que le profil de l'enveloppe, c'est-à-dire que la largeur de la lame et la largeur de l'enveloppe évoluent en sens inverses le long du brin. Autrement dit, les taux de variation de la largeur de la lame et de la largeur de l'enveloppe le long du profil ont des signes opposés. Le profil de la lame ne suit pas le profil de l'enveloppe sur au moins une partie du brin, par exemple sur au moins une moitié du brin. De façon plus générale, le taux de variation de la valeur de l'inertie de la section transversale de la lame le long du brin est de signe opposé au taux de variation de la valeur de l'inertie de la section transversale de l'enveloppe sur au moins une partie du brin ou du renfort, par exemple sur au moins une moitié du brin. Ainsi, la valeur de l'inertie de la section transversale de la lame et la valeur de l'inertie de la section transversale de l'enveloppe évoluent en sens opposés sur au moins une partie du brin ou du renfort, par exemple sur au moins une moitié du brin.In all cases, the profile of the blade along the strand does not evolve in the same direction as the profile of the envelope, that is to say that the width of the blade and the width of the envelope evolve in opposite directions along the strand. In other words, the rates of variation of the width of the blade and the width of the envelope along the profile have opposite signs. The profile of the blade does not follow the profile of the envelope on at least a portion of the strand, for example on at least half of the strand. More generally, the rate of change of the value of the inertia of the cross section of the blade along the strand is opposite sign to the rate of change of the value of the inertia of the cross section of the envelope on at least a portion of the strand or reinforcement, for example on at least half of the strand. Thus, the value of the inertia of the cross section of the blade and the value of the inertia of the cross-section of the envelope move in opposite directions on at least a part of the strand or the reinforcement, for example on at least half of the strand.
De la même manière, le taux de variation de la valeur d'épaisseur de la lame le long du brin peut être de signe opposé au taux de variation de la valeur d'épaisseur de l'enveloppe sur au moins une partie du brin ou du renfort, par exemple sur au moins une moitié du brin. Ainsi, la valeur d'épaisseur de la lame et la valeur d'épaisseur de l'enveloppe peuvent évoluer en sens opposés sur au moins une partie du brin ou du renfort, par exemple sur au moins une moitié du brin.Similarly, the rate of change of the thickness value of the blade along the strand may be of opposite sign to the rate of change of the thickness value of the envelope on at least a portion of the strand or reinforcement, for example on at least half of the strand. Thus, the thickness value of the blade and the thickness value of the envelope can evolve in opposite directions on at least a portion of the strand or reinforcement, for example on at least half of the strand.
De la même manière, le taux de variation de la valeur de largeur de la lame le long du brin est de signe opposé au taux de variation de la valeur d'épaisseur de l'enveloppe sur au moins une partie du brin ou du renfort, par exemple sur au moins une moitié du brin. Ainsi, la valeur de largeur de la lame et la valeur d'épaisseur de l'enveloppe évoluent en sens opposés sur au moins une partie du brin ou du renfort, par exemple sur au moins une moitié du brin.Similarly, the rate of change of the width value of the blade along the strand is of opposite sign to the rate of change of the thickness value of the envelope on at least a portion of the strand or reinforcement, for example on at least half of the strand. Thus, the width value of the blade and the thickness value of the envelope move in opposite directions on at least a portion of the strand or reinforcement, for example on at least half of the strand.
Il convient aussi de noter que l'exemple de la
Grâce à une telle architecture, en particulier grâce à la variation de la section du renfort le long du brin, on peut obtenir un profil désiré de souplesse du brin le long de celui-ci, notamment un profil constant sur une partie de la longueur du brin, voire sur toute la longueur du brin.Thanks to such an architecture, in particular thanks to the variation of the section of the reinforcement along the strand, a desired profile of flexibility of the strand along this strand can be obtained, in particular a constant profile over a part of the length of the strand. strand, even over the entire length of the strand.
En conclusion, l'utilisation d'un renfort à largeur variable permet de compenser l'effet de la géométrie extérieure du brin. Elle permet même d'atténuer notablement l'effet dû à la présence d'un renfort s'étendant sous le plan inférieur du brin, comme par exemple un coussin de confort. La zone d'enroulement du brin autour du poignet peut alors présenter une souplesse quasi-constante et procurer un confort de porter significativement accru.In conclusion, the use of a variable width reinforcement makes it possible to compensate for the effect of the external geometry of the strand. It can even significantly reduce the effect due to the presence of a reinforcement extending under the lower plane of the strand, such as a comfort cushion. The winding zone of the strand around the wrist can then have a quasi-constant flexibility and provide a comfort to wear significantly increased.
Le renfort présente donc une section transversale dont la géométrie, en particulier la largeur de la section transversale, évolue le long du brin de sorte que la rigidité à la flexion du brin, le long du brin, présente un profil déterminé, en particulier un profil constant sur au moins une partie du brin, par exemple sur au moins une moitié du brin, par exemple sur la moitié du brin proche de l'élément de fermeture. Par « profil constant », on entend que la rigidité à la flexion du brin ne varie pas de plus de 20% d'une valeur nominale, voire préférentiellement ne varie pas de plus de 10% de la valeur nominale, voire idéalement ne varie pas de plus de 5% de la valeur nominale.The reinforcement thus has a cross section whose geometry, in particular the width of the cross section, evolves along the strand so that the bending rigidity of the strand, along the strand, has a determined profile, in particular a profile. constant on at least a portion of the strand, for example on at least half of the strand, for example on half of the strand close to the closure element. "Constant profile" means that the bending rigidity of the strand does not vary by more than 20% of a nominal value, or even preferably does not vary by more than 10% of the nominal value, or ideally does not vary. more than 5% of the nominal value.
L'enveloppe 3 est par exemple réalisée en matériau polymère. Les matériaux polymères incluent les différentes familles suivantes :
- thermodurcissables,
- élastomères,
- thermoplastiques.
- thermosets,
- elastomers,
- thermoplastics.
Le brin a été décrit précédemment appliqué à un bracelet comprenant deux brins et un fermoir. Dans ce cas préféré, le brin comprend un renfort s'étendant de l'attache de la boîte à l'attache du fermoir.The strand has been previously described applied to a bracelet comprising two strands and a clasp. In this preferred case, the strand comprises a reinforcement extending from the attachment of the box to the clasp fastener.
Il peut aussi être appliqué à un bracelet comprenant deux brins et un autre élément de fermeture, comme un système boucle et ardillon coopérant avec des trous d'ardillon. Le brin peut donc comprendre un renfort s'étendant de l'attache de la boîte à l'attache de la boucle ou un renfort s'étendant de l'attache de la boîte aux trous d'ardillon.It can also be applied to a bracelet comprising two strands and another closure element, such as a buckle and barb system cooperating with pin holes. The strand may thus comprise a reinforcement extending from the fastener of the box to the fastener of the buckle or a reinforcement extending from the fastener of the box to the pin holes.
Dans ce document, on entend par « l'élément de liaison 4 relie mécaniquement ou solidarise mécaniquement un premier élément de fixation 6 à un deuxième élément de fixation 5 » que l'élément de liaison empêche, sauf à rompre l'élément de liaison, que le premier élément puisse être écarté du deuxième élément de fixation, sous un effort de traction de 50N, voire 100N, voire 200N. Ceci reste vrai même avant que l'enveloppe soit mise en place autour du renfort.
- 1. Selon un deuxième aspect de l'invention,
un renfort 2 ; 2' debrin 1 de bracelet de montre est destiné à être logé dans une enveloppe 3 du brin en matériau souple. Le renfort comprend un élément deliaison 4 ; 4' reliant mécaniquement ou solidarisant mécaniquement :un élément 10 ; 6 ; 10' de fixation du brin à une boîte de montre, àun élément 9 ; 5 de fixation du brin à un élément de fermeture.
- 2. Renfort selon
la proposition 1 ci-dessus, caractérisé en ce que l'élément de liaison comprend une lame, notamment une lame métallique, en particulier une lame métallique en alliage superélastique. - 3. Renfort selon l'une des
propositions 1et 2, caractérisé en ce que l'élément de fixation du brin à la boîte de montre est en alliage superélastique et/ou l'élément de fixation du brin à l'élément de fermeture est en alliage superélastique. - 4. Renfort selon l'une des
propositions 1 à 3, caractérisé en ce que l'élément de fixation du brin à la boîte de montre comprend un tube et/ou l'élément de fixation du brin à l'élément de fermeture comprend un tube. - 5. Renfort selon l'une des
propositions 1 à 4, caractérisé en ce que l'élément de liaison présente une section transversale dont la géométrie, en particulier la largeur de la section transversale et/ou l'épaisseur de la section transversale, évolue le long du brin ou du renfort. - 6. Renfort selon l'une des
propositions 1 à 5, caractérisé en ce que l'élément de liaison forme au moins une partie de l'élément 6' de fixation du brin à la boîte de montre, notamment une boucle 8, et/ou l'élément de liaison forme au moins une partie de l'élément 5' de fixation du brin à l'élément de fermeture, notamment une boucle 7. - 7. Renfort selon
la proposition 6, caractérisé en ce que l'élément de liaison comprend une extrémité 20 repliée et fixée sur l'élément de liaison au niveau de l'élément 6' de fixation du brin à la boîte de montre et/ou l'élément de liaison comprend une extrémité repliée et fixée sur l'élément de liaison au niveau de l'élément 5' de fixation du brin à un élément de fermeture. - 8. Renfort selon
la proposition 7, caractérisé en ce que l'extrémité repliée de l'élément de liaison au niveau de l'élément 6' de fixation du brin à la boîte de montre est fixée sur l'élément de liaison par rivetage et/ou soudage et/ou vissage et/ou l'extrémité repliée de l'élément de liaison au niveau de l'élément 5' de fixation du brin à l'élément de fermeture est fixée sur l'élément de liaison par rivetage et/ou soudage et/ou vissage. - 9. Renfort selon l'une des
propositions 1 à 5, caractérisé en ce que l'élément deliaison 4 est fixé directement à l'élément defixation 10 du brin à la boîte de montre et/ou l'élément deliaison 4 est fixé directement à l'élément defixation 9 du brin à l'élément de fermeture, par exemple fixé par soudure ou brasure. - 10. Renfort selon
la proposition 9, caractérisé en ce que l'élément deliaison 4 est fixé directement à son extrémité à l'élément defixation 10 du brin à la boîte de montre et/ou à l'élément defixation 9 du brin à l'élément de fermeture.
- According to a second aspect of the invention, a
reinforcement 2; 2 'strand 1 of watch strap is intended to be housed in anenvelope 3 of the strand of flexible material. The reinforcement comprises a connectingelement 4; 4 'mechanically linking or mechanically joining:- an
element 10; 6; 10 'fixing the strand to a watch case, to - an
element 9; 5 securing the strand to a closure member.
- an
- 2. Reinforcement according to
proposal 1 above, characterized in that the connecting element comprises a blade, in particular a metal blade, in particular a metal blade of superelastic alloy. - 3. Reinforcement according to one of the
1 and 2, characterized in that the fastening element of the strand to the watch case is superelastic alloy and / or the fastening element of the strand to the closure element is superelastic alloy.proposals - 4. Reinforcement according to one of the
proposals 1 to 3, characterized in that the fastening element of the strand to the watch case comprises a tube and / or the fastening element of the strand to the closure element comprises a tube. - 5. reinforcement according to one of the
proposals 1 to 4, characterized in that the connecting element has a cross section whose geometry, in particular the width of the cross section and / or the thickness of the cross section, evolves along the strand or reinforcement. - 6. reinforcement according to one of the
proposals 1 to 5, characterized in that the connecting element forms at least a portion of the element 6 'securing the strand to the watch case, including aloop 8, and / or the connecting element forms at least a part of the element 5 'attaching the strand to the closure element, in particular aloop 7. - 7. Reinforcement according to the
proposal 6, characterized in that the connecting element comprises a foldedend 20 and fixed on the connecting element at the element 6 'securing the strand to the watch case and / or the connecting element comprises a folded end and fixed on the connecting element at the element 5 'securing the strand to a closure element. - 8. Reinforcement according to the
proposal 7, characterized in that the folded end of the connecting element at the level of the fastening element 6 'of the strand to the watch case is fixed on the connecting element by riveting and / or welding and / or screwing and / or the folded end of the connecting element at the level of the fastening element 5 'of the strand to the closure element is fixed on the connecting element by riveting and / or welding and / or screwing. - 9. Reinforcement according to one of the
proposals 1 to 5, characterized in that the connectingelement 4 is fixed directly to thefastening element 10 of the strand to the watch case and / or the connectingelement 4 is attached directly to the fixingelement 9 of the strand to the closure element, for example fixed by welding or brazing. - 10. Reinforcement according to the
proposal 9, characterized in that the connectingelement 4 is fixed directly at its end to thefastening element 10 of the strand to the watch case and / or thefastening element 9 of the strand. to the closure element.
Selon un troisième aspect de l'invention, un renfort 2 ; 2' de brin 1 de bracelet de montre destiné à être logé dans une enveloppe 3 de brin en matériau souple comprend une lame réalisée en alliage superélastique, la lame s'étendant d'un élément 10 ; 6 ; 10' ; 6' de fixation du brin à une boîte de montre à un élément 9 ; 5 ; 9' ; 5' de fixation du brin à un élément de fermeture.According to a third aspect of the invention, a
Claims (14)
- A watch strap strip (1) reinforcement (2; 2') intended to be housed in a casing (3) of the strip made from a flexible material, characterized in that the reinforcement includes a blade having a cross-section of which the geometry changes along the strip, the thickness of the cross-section changing along the strip, the blade extending from an element (10; 6; 10'; 6') for fixing the strip to a watch case to an element (9; 5; 9'; 5') for fixing the strip to a closure element, the geometry changing along the strip or the reinforcement in such a way that the flexural rigidity of the strip, along the strip, has a predetermined profile.
- The reinforcement as claimed in claim 1, characterized in that the blade is a metallic blade and/or the element for fixing the strip to the watch case is made from a superelastic alloy and/or the element for fixing the strip to the closure element is made from a superelastic alloy.
- The reinforcement as claimed in one of claims 1 to 2, characterized in that the element for fixing the strip to the watch case includes a tube and/or the element for fixing the strip to the closure element includes a tube.
- The reinforcement as claimed in one of claims 1 to 3, characterized in that the blade has a cross-section of which the geometry changes along the strip or the reinforcement.
- The reinforcement as claimed in one of claims 1 to 4, characterized in that the blade forms at least one part of the element (6') for fixing the strip to the watch case, especially a loop (8), and/or the blade forms at least one part of the element (5') for fixing the strip to the closure element, especially a loop (7).
- The reinforcement as claimed in the preceding claim, characterized in that the blade includes an extremity (20) that is folded and fixed to the blade at the level of the element (6') for fixing the strip to the watch case, and/or the blade includes an extremity that is folded and fixed to the blade at the level of the element (5') for fixing the strip to a closure element.
- The reinforcement as claimed in the preceding claim, characterized in that the folded extremity of the blade at the level of the element (6') for fixing the strip to the watch case is fixed to the blade by riveting and/or soldering and/or screwing, and/or the folded extremity of the blade at the level of the element (5') for fixing the strip to the closure element is fixed to the blade by riveting and/or soldering and/or screwing.
- The reinforcement as claimed in one of claims 1 to 4, characterized in that the blade (4) is fixed directly to the element (10) for fixing the strip to the watch case and/or the blade (4) is fixed directly to the element (9) for fixing the strip to the closure element, for example being fixed by soldering or brazing.
- The reinforcement as claimed in the preceding claim, characterized in that the blade (4) is fixed directly at its extremity to the element (10) for fixing the strip to the watch case or to the element (9) for fixing the strip to the closure element.
- The reinforcement as claimed in one of the preceding claims, characterized in that the linking element or the blade is of a nature such that it prevents the element (10) for fixing the strip to the watch case from being separated from the element, other than by breaking the linking element or the blade, for the purpose of fixing the strip to the closure element (9), under a tensile load of 50 N, or 100 N or 200 N.
- A watch strap strip (1) including a reinforcement as claimed in one of the preceding claims and a casing (3), especially a casing made from an elastomer material.
- The strap strip as claimed in the preceding claim, characterized in that the casing includes at least one opening (30) revealing the reinforcement and/or in that the casing is molded onto the reinforcement and/or in that the inertias and/or the geometries of the sections of the linking element, especially of the reinforcement, and/or of the casing, change along the strip or the reinforcement in such a way that the flexural rigidity of the strip, along the strip, has a predetermined profile and/or in that characteristic values for the inertias and/or the geometries of the sections of the linking element or the blade and the casing change along the strip or the reinforcement in opposite directions.
- A watch strap including at least one strap strip as claimed in one of claims 11 to 12.
- A watch including at least one strap strip as claimed in one of claims 11 to 12.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14173541.5A EP2783592B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH00620/11A CH704771B1 (en) | 2011-04-06 | 2011-04-06 | Watch strap strand reinforcement. |
EP11405241 | 2011-04-07 | ||
EP14173541.5A EP2783592B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
EP12713859.2A EP2693910B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12713859.2A Division-Into EP2693910B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
EP12713859.2A Division EP2693910B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2783592A1 EP2783592A1 (en) | 2014-10-01 |
EP2783592B1 true EP2783592B1 (en) | 2017-08-16 |
Family
ID=46968510
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14173541.5A Active EP2783592B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
EP21166514.6A Pending EP3861884A1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strand |
EP12713859.2A Active EP2693910B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21166514.6A Pending EP3861884A1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strand |
EP12713859.2A Active EP2693910B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
Country Status (5)
Country | Link |
---|---|
US (1) | US9516928B2 (en) |
EP (3) | EP2783592B1 (en) |
JP (1) | JP6081443B2 (en) |
CN (1) | CN103561606B (en) |
WO (1) | WO2012135967A1 (en) |
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WO2016019110A2 (en) | 2014-08-01 | 2016-02-04 | Utex Industries, Inc. | High pressure seal with composite anti-extrusion mechanism |
KR102270209B1 (en) | 2014-10-28 | 2021-06-29 | 삼성전자주식회사 | Wearable electronic device |
CN104621871B (en) * | 2015-02-03 | 2016-08-24 | 惠州Tcl移动通信有限公司 | A kind of compound chain belt and chain belt manufacture method |
USD802465S1 (en) * | 2016-01-06 | 2017-11-14 | Samsonite Ip Holdings S.Àr.L. | Two-piece watch strap |
US9609921B1 (en) | 2016-03-04 | 2017-04-04 | Feinstein Patents, Llc | Self-fitting, self-adjusting, automatically adjusting and/or automatically fitting magnetic clasp |
CN208463107U (en) * | 2018-04-09 | 2019-02-05 | 云谷(固安)科技有限公司 | Wrist equipment and its wrist strap component |
CN109846153A (en) * | 2018-12-07 | 2019-06-07 | 深圳市中电华通科技有限公司 | A kind of watch bracelet and preparation method thereof |
EP3923089B1 (en) | 2020-06-09 | 2023-06-07 | Olga Tishurova | Watch strap for a mechanical watch |
EP4052883A1 (en) | 2021-03-03 | 2022-09-07 | Rolex Sa | Method for manufacturing a clock component |
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- 2012-04-05 WO PCT/CH2012/000080 patent/WO2012135967A1/en active Application Filing
- 2012-04-05 EP EP21166514.6A patent/EP3861884A1/en active Pending
- 2012-04-05 EP EP12713859.2A patent/EP2693910B1/en active Active
- 2012-04-05 JP JP2014502967A patent/JP6081443B2/en active Active
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Also Published As
Publication number | Publication date |
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JP6081443B2 (en) | 2017-02-15 |
CN103561606A (en) | 2014-02-05 |
EP2693910B1 (en) | 2021-05-05 |
US20140053602A1 (en) | 2014-02-27 |
EP2783592A1 (en) | 2014-10-01 |
EP3861884A1 (en) | 2021-08-11 |
EP2693910A1 (en) | 2014-02-12 |
WO2012135967A1 (en) | 2012-10-11 |
CN103561606B (en) | 2016-12-28 |
JP2014509914A (en) | 2014-04-24 |
US9516928B2 (en) | 2016-12-13 |
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