EP2693910B1 - Watch strap strip - Google Patents
Watch strap strip Download PDFInfo
- Publication number
- EP2693910B1 EP2693910B1 EP12713859.2A EP12713859A EP2693910B1 EP 2693910 B1 EP2693910 B1 EP 2693910B1 EP 12713859 A EP12713859 A EP 12713859A EP 2693910 B1 EP2693910 B1 EP 2693910B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- reinforcement
- strand
- blade
- 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.)
- Active
Links
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- 238000005219 brazing Methods 0.000 claims 2
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
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- 239000004416 thermosoftening plastic Substances 0.000 description 2
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
- HLXZNVUGXRDIFK-UHFFFAOYSA-N nickel titanium Chemical compound [Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni] HLXZNVUGXRDIFK-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- 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
-
- 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
-
- 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 strand for a bracelet comprising a reinforcing tet.
- the invention also relates to a bracelet comprising at least one such strand.
- the invention relates to a watch comprising at least one such part.
- the aim of the invention which is defined by the claims, is to provide a bracelet overcoming the drawbacks mentioned above and improving the bracelets known from the prior art.
- the invention provides an efficient and comfortable bracelet.
- the invention also proposes a watch comprising such a bracelet.
- a bracelet strand according to the invention is defined by claim 1.
- bracelet according to the invention is defined by claim 11.
- a watch according to the invention is defined by claim 12.
- a method for determining a geometry of a bracelet strand is disclosed below.
- the bracelet strand is of the flexible type, in particular of the hybrid type, that is to say of flexible material but comprising a reinforcement.
- the bracelet strand comprises a reinforcement 2 placed in an envelope made of flexible material.
- the reinforcement is preferably made of a first material and the casing 3 is made of a second material.
- the first material is metallic, in particular an alloy, in particular a superelastic alloy or a shape memory alloy.
- the second material is flexible.
- the second material is an elastomer, like rubber.
- a strand is preferably produced, the architecture of which is based on a central core or reinforcement and an envelope implemented around the core, that is to say at least partially coating the core.
- the reinforcement ensures high performance in terms of mechanical strength of the strand, in particular in terms of tensile strength (high strength) and in deformation of the latter under stress (low deformation). Complementarily or alternatively, the reinforcement makes it possible to ensure high performance in terms of mechanical resistance of the strand to bending.
- the envelope (or coating of the strand) at least partially surrounding the reinforcement allows for its main functions of comfort and aesthetics, in particular by making it possible to obtain a desired flexibility and / or a desired lightness and / or a desired geometry.
- the envelope is overmolded on the reinforcement, it is made of elastomeric material.
- an opening 30 can be made in the casing in order to reveal the reinforcement 2.
- the visible part of the reinforcement can then be treated to avoid any deterioration of the latter.
- the opening can have an aesthetic function and / or the function of revealing the technicality of the bracelet strand.
- the reinforcement comprises an element 6 for fixing the strand to the watch case and an element 5 for fixing the strand to a closure element.
- the reinforcement comprises a connecting element 4 mechanically connecting the element 6 for fixing the strand to the watch case to the element 5 for fixing the strand to a closure element.
- the element 6 for fixing the strand to the watch case comprises a tube 10 and the element 5 for fixing the strand to the closure element comprises a tube 9.
- the reinforcement 2 comprises a blade 4, in particular a metal blade, in particular a blade made of superelastic metal alloy.
- the element 6 for fixing the strand to the watch case is intended to cooperate with a second fixing element provided for securing the strand to the watch case, in particular to the horns.
- the first and second elements constitute a tie.
- the element 5 for fixing the strand to a closure element is intended to cooperate with a second fixing element provided to secure the strand to the closure element, which may in particular be a buckle or a clasp, by example a folding clasp.
- the first and second elements constitute a tie.
- the element 6 for fixing the strand to the watch case and / or the element 5 for fixing the strand to a closing element is made by means of a tube assembled to the blade 4 by welding or soldering 19
- the tubes 9 and 10 can also have an extra thickness and / or a groove intended to receive the end of the blade and to facilitate and / or improve the performance of the weld or solder.
- the tube shown has a groove to receive the blade 4.
- a bar, a screw or a pin, constituting the second fixing element, is then engaged in each tube 9 and 10 to fix the strand to the watch case or to the closure element.
- the tubes are preferably chosen from the same material as the material of the metal strip 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 an 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 carried out by welding, the welding being more preferably of the laser type.
- the recommended assembly by laser welding allows localized melting of the material and therefore secures the end of the blade and the tube, without external input of material, while ensuring excellent mechanical performance and good corrosion resistance.
- 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 damaging the casing when using a bar clamp to mount the strand on the middle part.
- tubes made of Phynox, Nivaflex or equivalent material could also be used, with the risk that the assembly of the tubes at the ends of the blade would be more difficult to achieve.
- the tube 10 for attaching to the watch case must be much shorter to allow this compression.
- the element 6 'for fixing the strand to the watch case and / or the element 5' for fixing the strand to a closure element is produced by folding the end of the blade 4 '. Indeed, the first end is folded to form a passage 8 or a loop and part 20 of the end is folded over the blade 4 '. This folded or folded part 20 is fixed to 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 in vis-à-vis and to receive rivets 14.
- the reinforcement In order to ensure the performance of the strand, the reinforcement must be connected to the attachments while maintaining its performance as well as possible.
- the riveted fold at each end makes it possible to provide a passage for a bar, a screw or a pin intended for fixing the strand.
- a tube 10 ' can be placed in the passage 8 and / or a tube 9' can be placed 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 a pin, constituting the second fixing element, is then engaged in each tube to fix the strand to the watch case or to the closure element.
- 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 the tubes is preferred.
- the tubes are preferably chosen from a material Phynox, Nivaflex, superelastic alloy or equivalent, which makes it possible to ensure, on the one hand, good mechanical performance and, on the other hand, 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 damaging the casing when using a bar clamp to mount the strand on the middle part.
- the reinforcement is first produced which makes it possible to mechanically connect the element for fixing the strand to the watch case to the element for fixing the strand to the closure element.
- a mechanical tensile action of 50N, or even 100N, or even 200N, on the reinforcement does not make it possible to deform the reinforcement and the fixing element, as is the case in the prior art.
- a mechanical tensile action on an axis or a bar located in the tube 9 or 10 does not make it possible to release the tube or the other element of the reinforcement, except to break the reinforcement.
- the fasteners of the fasteners are secured to the reinforcement.
- the main role of the reinforcement 2 is to ensure the mechanical strength of the strand. Taking into account the need to have a flexible strap and the criterion of resistance to different forces, the reinforcement mainly comprises a metal strip or a metal blade 4.
- the use of a superelastic metal alloy also makes it possible to improve the resistance. folding resistance.
- a superelastic alloy is advantageously used for the reinforcement. Superelasticity manifests itself in some very specific alloys which 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 stress applied ceases.
- the martensitic transformation can be caused under stress.
- the stress is exerted first in the elastic strain domain of the austenite, with a stress proportional to the strain. Above a critical value, austenite turns into martensite. When the stress ceases, there is total reversion of the martensite towards austenite until zero strain since, at the stress 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 while the stress varies.
- the elasticity of these alloys can reach ten times that of steel.
- Nitinol nickel and Titanium NiTi
- CuAlBe, CuAINi or CuZnAI alloys can also be used.
- the NiTi alloy reinforcement in particular an NiTi alloy blade assembled by laser welding to the NiTi alloy tubes, has excellent mechanical and corrosion resistance, even in unfavorable cases (association of materials favoring the equivalent of galvanic corrosion and prestressing of the metal blade), and this after two months of salt spray test.
- the blades used can have an initial curvature of zero and the curvature of the strand can be obtained during the molding of the casing. It is also conceivable to give the blade an initial curvature (preform) with a suitable manufacturing process.
- the reinforcement can be dimensioned on its own without taking the envelope into account. It remains obvious that the addition of a casing further improves the tensile strength.
- the NIHS 92-11 standard states that a watch strap must be able, as shown in figure 7 , resist 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 the shear breakage of the pins of the bars.
- the reinforcement is then dimensioned according to the maximum tensile force F that the strand must be able to withstand without breaking, by estimating the stresses equivalent to the maximum force, which must be less than the elastic limit of the material.
- F the maximum tensile force
- a thickness of 0.1mm of the blade makes it possible to obtain a limiting force before plastic deformation of 440N, that is to say well above the desired values and far below the elastic limit and the stress at break of the material.
- the thickness of the envelope can be chosen so as to optimize the resistance of the strand to bending.
- the admissible bending radius is 0.7mm (by comparison, a central stainless steel blade (type 1.4310) only tolerates a minimum bending radius of 5mm).
- 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 180 ° bend of the strand.
- the NiTi alloy loses its superelastic properties below 0 ° C. However, the alloy regains all of 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 again as soon as the temperature is higher (resumption of the shape in 8s at 20 ° C ). Likewise, the superelastic alloy blade retains all of its superelastic properties following coating (overmolding conditions: typically T> 180 ° C for several minutes). This temperature behavior can vary depending on the superelastic alloy chosen. Thus, certain alloys allow use at a lower temperature, but with a reduction in the maximum temperature of use.
- the blades shown in figures 2 , 3 and 7 to 11 have a complex shape, with a side section that varies along the strand. This makes it possible to fine-tune 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 complex bracelet strand as shown in figure 1 , these variations in flexibility can interfere with wearing 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 casing by playing on the inertia of the blade, in particular on its width.
- the objective is to ensure a predefined flexibility of the strand throughout the latter, in particular constant, over the entire length of the strand or, failing that, over part of the strand, in particular 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 plan AA level of the figure 8
- the figure 10 is a section at plane BB of the figure 8
- the figure 11 is a section at CC plane level of the figure 8 .
- the geometries of the section of the strand are different at the level of these three planes.
- the geometry of the section of the casing 3 and / or the geometry of the section of the reinforcement 4 changes along the strand.
- the section of the envelope changes to provide aesthetic functions and the section of the reinforcement changes to provide a mechanical function, in particular a mechanical function related to comfort.
- the figure 9 also shows an opening 30.
- This architecture makes it possible to have 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 variations in the section of the casing.
- the strands with variable reinforcement section are optimized to ensure constant rigidity throughout the strand, with a nominal value equal to 1 on the ordinate. It can be seen that the variable section of the reinforcement makes it possible to compensate to a very large extent for the effects of variations in the section of 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 variable section reinforcement, which is no longer perceptible.
- the abscissa points 14, 21 and 28 correspond approximately 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 process of sizing the blade.
- the bracelet strand is composed of a reinforcement of elastic modulus E r and of an envelope of a material of modulus E e .
- the flexural stiffness of a single material strand is proportional to the product of the elastic modulus and the inertia of the section.
- the rigidity of the strand will be proportional, as a first approximation, to (E r ⁇ I r + E e ⁇ I e ), where I r and I e represent the inertia of the cross section of the reinforcement and the casing, respectively.
- the envelope 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 in rigidity of the envelope alone.
- the figure 15 shows a strand whose envelope has a width of 16mm at one end (origin of the abscissa x) which remains constant until the middle of the strand, then which increases linearly up to 20mm at the other end of the strand , with a constant thickness of 2.8mm.
- the figure 16 represents an envelope of constant width along the strand, the thickness of which is 2.8mm on the first half of the strand and increases linearly to 3.2mm.
- the figure 17 combines variations in the width and thickness of the strands of figures 15 and 16 .
- the thickness of the reinforcement is chosen constant at 0.1mm, 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 casing, i.e. the width of the blade and the width of the casing evolve in opposite directions along the strand. That is, the rates of change of blade width and casing width along the profile have opposite signs.
- the profile of the blade does not follow the profile of the casing on at least part of the strand, for example on at least one 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 of opposite sign to the rate of change of the value of the inertia of the cross section of the casing on at least part of the strand or of the 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 casing evolve in opposite directions over at least part of the strand or of the reinforcement, for example over at least half of the strand.
- the rate of change of the thickness value of the blade along the strand may be of the opposite sign to the rate of change of the thickness value of the casing over at least part of the strand or the strand. reinforcement, for example on at least half of the strand.
- the thickness value of the blade and the thickness value of the casing can change in opposite directions over at least part of the strand or of the reinforcement, for example over at least half of the strand.
- the rate of change of the value of the width of the blade along the strand is of the opposite sign to the rate of change of the value of the thickness of the casing over at least part of the strand or of the reinforcement, for example on at least half of the strand.
- the width value of the blade and the thickness value of the casing evolve in opposite directions over at least part of the strand or of the reinforcement, for example over at least half of the strand.
- variable width reinforcement makes it possible to compensate for the effect of the outer geometry of the strand. It even makes it possible to significantly attenuate the effect due to the presence of a reinforcement extending under the lower plane of the strand, such as for example a comfort cushion.
- the area for winding the strand around the wrist can then exhibit almost constant flexibility and provide significantly increased wearing comfort.
- the reinforcement therefore has a cross section whose geometry, in particular the width of the cross section, changes along the strand so that the flexural rigidity of the strand, along the strand, has a determined profile, in particular a profile. constant over at least part of the strand, for example over at least one half of the strand, for example over half of the strand close to the closure element.
- constant profile is meant that the bending stiffness 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 even ideally does not vary. more than 5% of the nominal value.
- the family best suited to a flexible bracelet application is the family of elastomers, and possibly that of thermoplastics-elastomers (mixture of elastomer and thermoplastic generally called “TPE”).
- TPE thermoplastics-elastomers
- TPE thermoplastics-elastomers
- TPE thermoplastics-elastomers
- the compound will be selected according to the elastomer and the reinforcing material used, for example by consulting the “Product Selector Guide” for Chemlok / Chemosil adhesives from the LORD company.
- the strand has been described previously applied to a bracelet comprising two strands and a clasp.
- the strand comprises a reinforcement extending from the attachment of the box to the attachment of the clasp.
- the strand may therefore include a reinforcement extending from the box attachment to the buckle attachment or a reinforcement extending from the box attachment to the tongue holes.
- connecting element 4 mechanically connects or mechanically integrates a first fastening element 6 to a second fastening element 5
- the connecting element prevents, except by breaking the connecting element, that the first element can be moved away from the second fixing element, under a tensile force of 50N, or even 100N, or even 200N. This remains true even before the wrap is put in place around the reinforcement.
Landscapes
- Adornments (AREA)
- Clamps And Clips (AREA)
- Buckles (AREA)
- Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
Description
L'invention concerne un brin pour bracelet comprenant un tet 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 strand for a bracelet comprising a reinforcing tet. The invention also relates to a bracelet comprising at least one such strand. Finally, the invention relates to a watch comprising at least one such part.
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 watch straps exist on the market, in particular made of 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.To resolve these problems, it has been envisaged to produce bracelets of the hybrid type, that is to say flexible bracelets having reinforcements.
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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 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 all perform relatively poorly mechanically, in particular with regard to the resistance of the strands in traction. It is therefore necessary to make a choice between a flexible elastomer strap which is comfortable and a mechanically efficient metal strap. Flexible bracelets are in particular invariably less robust than metal bracelets, for example in terms of tensile strength or folding strength.
Aussi, le but de l'invention, qui est définie par le revendications, 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 aim of the invention, which is defined by the claims, is to provide a bracelet overcoming the drawbacks mentioned above and improving the bracelets known from the prior art. In particular, the invention provides an efficient and comfortable bracelet. The invention also proposes a watch comprising such a bracelet.
Un brin de bracelet selon l'invention est défini par la revendication 1.A bracelet strand according to the invention is defined by
Différents modes de réalisation du brin de bracelet selon l'invention sont définis par les revendications 2 à 10.Different embodiments of the bracelet strand according to the invention are defined by
bracelet selon l'invention est défini par la revendication 11.bracelet according to the invention is defined by claim 11.
Une montre selon l'invention est définie par la revendication 12.A watch according to the invention is defined by
Un procédé de détermination d'une géométrie d'un brin de bracelet est divulgué ci-après.A method for determining a geometry of a bracelet strand is disclosed below.
Les dessins annexés représentent des modes de réalisation d'un bracelet.
- 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. - 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. - 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. - 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 the reinforcement used in one embodiment of the bracelet strand. - The
figure 4 represents a view of an embodiment of a tube used in an embodiment of the bracelet strand according to the invention at the level of the attachment to the watch case. - The
figure 5 is a view of an embodiment of a tube used in an embodiment of the bracelet strand according to the invention at the level of the attachment to a closure element. - The
figure 6 is a partial sectional view of one end of the reinforcement according to the second reinforcement embodiment. - The
figure 7 is a perspective view of the first embodiment of the reinforcement used in one embodiment of the bracelet strand according to the invention. - The
figure 8 is a view in longitudinal section of the first embodiment of the reinforcement used in one embodiment of the bracelet strand according to the invention. - The
figures 9 to 11 are cross-sectional views of the embodiment of reinforcement used in the embodiment of the bracelet strand according to the invention illustrated infigure 8 . - The
figures 12 and 13 are partial sectional views of one end of two variants of the first embodiment of the reinforcement according to the invention illustrated infigure 2 . - The
figure 14 is a graph showing variations in flexural stiffness of different embodiments of bracelet strands. - The
figures 15 to 17 are graphs representing the variations in width of the reinforcement (broken line) to obtain a constant rigidity along the strand and thus compensate for the variations in 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 figures.An embodiment of a
Le brin de bracelet est de type souple, en particulier de type hybride, c'est-à-dire en matière souple mais comprenant un renfort.The bracelet strand is of the flexible type, in particular of the hybrid type, that is to say of flexible material but comprising a reinforcement.
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. Le deuxième matériau est un élastomère, comme du caoutchouc.The bracelet strand comprises 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 œuvre 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 surmoulée sur le renfort, elle est réalisée en matériau élastomère.The properties of the first and second materials are distinct to separate the stresses as well as possible. A strand is preferably produced, the architecture of which is based on a central core or reinforcement and an envelope implemented around the core, that is to say at least partially coating the core. The reinforcement ensures high performance in terms of mechanical strength of the strand, in particular in terms of tensile strength (high strength) and in deformation of the latter under stress (low deformation). Complementarily or alternatively, the reinforcement makes it possible to ensure high performance in terms of mechanical resistance of the strand to bending. The envelope (or coating of the strand) at least partially surrounding the reinforcement allows for its main functions of comfort and aesthetics, in particular by making it possible to obtain a desired flexibility and / or a desired lightness and / or a desired geometry. The envelope is overmolded on the reinforcement, it is made of elastomeric material.
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. L'élément 6 de fixation du brin à la boîte de montre comprend un tube 10 et l'élément 5 de fixation du brin à l'élément de fermeture comprend un tube 9.The reinforcement comprises an
Le renfort 2 comprend une lame 4, notamment une lame métallique, en particulier une lame en alliage métallique superélastique.The
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 10 pour fixer le brin à la boîte de montre ou à l'élément de fermeture.A bar, a screw or a pin, constituting the second fixing 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 event that the casing is subsequently molded onto the reinforcement;
- facilitate the introduction of the bar, screw or pin; it is indeed easy to thread a rod into a perfectly circular tube;
- precisely control the length of the strand, i.e. the distance (center distance) between the two axes of the strand / clasp and strand / box fasteners.
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 from the same material as the material of the metal strip constituting the reinforcement. In particular, when the material of the blade is a superelastic metal alloy, in particular an 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 an 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 carried out by welding, the welding being more preferably of the laser type. The recommended assembly by laser welding allows localized melting of the material and therefore secures the end of the blade and the tube, without external input of material, while ensuring excellent mechanical performance and good corrosion resistance. 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 made of Phynox, Nivaflex or equivalent material, with the risk that the assembly of the tubes at the ends of the blade would be 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.It is also possible to reduce the passage of the bar clamp to the strict minimum and to play on the elasticity of the casing to compress the bar. In this case, the
Dans un deuxième mode de réalisation, qui ne fait pas partie de l'invention, 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 attachments while maintaining its performance as well as possible. The riveted fold at each end makes it possible to provide a passage for a bar, a screw or a pin intended 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 a material Phynox, Nivaflex, superelastic alloy or equivalent, which makes it possible to ensure, on the one hand, good mechanical performance and, on the other hand, 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
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 possible to achieve the desired performance. For example, it is possible to staple the
A noter que les solutions connues de l'état de l'art ne sont pas satisfaisantes. Un simple pli comme dans le document
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.The reinforcement is first produced which makes it possible to mechanically connect the element for fixing the strand to the watch case to the element for fixing the strand to the closure element. Thus, at this stage of production, a mechanical tensile action of 50N, or even 100N, or even 200N, on the reinforcement does not make it possible to deform the reinforcement and the fixing element, as is the case in the prior art. . In particular, a mechanical tensile action on an axis or a bar located 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. 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.The main role of the
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 CuZnAI, 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 shows excellent corrosion resistance and is biocompatible. Other superelastic alloys, such as CuAlBe, CuAINi or CuZnAI alloys, can 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 an NiTi alloy blade assembled by laser welding to the NiTi alloy tubes, has excellent mechanical and corrosion resistance, even in unfavorable cases (association of materials favoring the equivalent of galvanic corrosion and prestressing of the metal blade), and this 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 can have an initial curvature of zero and the curvature of the strand can be obtained during the molding of the casing. 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 on its own without taking the envelope into account. It remains obvious that the addition of a casing further improves the tensile strength.
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 0.1mm 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 the strand must be able to withstand without breaking, by 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 context of the tests, with a minimum width of 7.4mm, a thickness of 0.1mm of the blade makes it possible to obtain a limiting force before plastic deformation of 440N, that is to say well above the desired values and far below the elastic limit and the stress at break 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 limit plasticization stress, even for an applied tensile force greater than 300N. The tests also showed that such a configuration allows a level of performance largely sufficient to meet the requirements of the NIHS 92-11 standard, which specifies the threshold values of tensile strength. Lateral deflection and traction resistance 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 0.1mm, 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 bending. For a blade thickness of 0.1mm, the admissible bending radius is 0.7mm (by comparison, a central stainless steel blade (type 1.4310) only tolerates a minimum bending radius of 5mm). 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 180 ° bend 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. However, the alloy regains all of 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 again as soon as the temperature is higher (resumption of the shape in 8s at 20 ° C ). Likewise, the superelastic alloy blade retains all of its superelastic properties following coating (overmolding conditions: typically T> 180 ° C for several minutes). This temperature behavior can vary depending on the superelastic alloy chosen. Thus, certain alloys allow use at a lower temperature, but with a reduction 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 (l=57.5, cst),
- un brin de 57.5 mm de longueur avec un renfort à section variable (l=57.5, var),
- un brin de 71.5 mm de longueur avec un renfort à section constante (l=71.5, cst),
- un brin de 71.5 mm de longueur avec un renfort à section variable (l=71.5, var).
- a 57.5 mm long strand with a constant section reinforcement (l = 57.5, cst),
- a 57.5 mm long strand with a variable section reinforcement (l = 57.5, var),
- a 71.5 mm long strand with a constant section reinforcement (l = 71.5, cst),
- a 71.5 mm long strand with a variable section reinforcement (l = 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 stiffness 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 flexural stiffness of the strand along the strand changes 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 casing, i.e. the width of the blade and the width of the casing evolve in opposite directions along the strand. That is, the rates of change of blade width and casing width along the profile have opposite signs. The profile of the blade does not follow the profile of the casing on at least part of the strand, for example on at least one 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 of opposite sign to the rate of change of the value of the inertia of the cross section of the casing on at least part of the strand or of the 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 casing evolve in opposite directions over at least part of the strand or of the reinforcement, for example over 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.Likewise, the rate of change of the thickness value of the blade along the strand may be of the opposite sign to the rate of change of the thickness value of the casing over at least part of the strand or the strand. reinforcement, for example on at least half of the strand. Thus, the thickness value of the blade and the thickness value of the casing can change in opposite directions over at least part of the strand or of the reinforcement, for example over 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.Likewise, the rate of change of the value of the width of the blade along the strand is of the opposite sign to the rate of change of the value of the thickness of the casing over at least part of the strand or of the reinforcement, for example on at least half of the strand. Thus, the width value of the blade and the thickness value of the casing evolve in opposite directions over at least part of the strand or of the reinforcement, for example over 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, it is possible to obtain a desired profile of flexibility of the strand along the latter, in particular a constant profile over part of the length of the strand. strand, or 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.In conclusion, the use of a variable width reinforcement makes it possible to compensate for the effect of the outer geometry of the strand. It even makes it possible to significantly attenuate the effect due to the presence of a reinforcement extending under the lower plane of the strand, such as for example a comfort cushion.
La zone d'enroulement du brin autour du poignet peut alors présenter une souplesse quasi-constante et procurer un confort de porter significativement accru.The area for winding the strand around the wrist can then exhibit almost constant flexibility and provide significantly increased wearing comfort.
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 therefore has a cross section whose geometry, in particular the width of the cross section, changes along the strand so that the flexural rigidity of the strand, along the strand, has a determined profile, in particular a profile. constant over at least part of the strand, for example over at least one half of the strand, for example over half of the strand close to the closure element. By "constant profile" is meant that the bending stiffness 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 even ideally does not vary. more than 5% of the nominal value.
L'enveloppe 3 est par exemple réalisée en matériau polymère. Les matériaux polymères (qui ne font pas tous partie de l'invention) incluent les différentes familles suivantes :
- thermodurcissables,
- élastomères,
- thermoplastiques.
- thermosets,
- elastomers,
- thermoplastics.
La famille la plus adaptée à une application de bracelet souple est la famille des élastomères, et éventuellement celle des thermoplastiques-élastomères (mélange d'élastomère et de thermoplastique généralement appelé « TPE »). Pour faciliter la réalisation du brin de bracelet, il est généralement favorable d'appliquer un composé chimique à la surface du renfort métallique qui favorise l'adhésion de l'élastomère sur le renfort. Le composé sera sélectionné en fonction de l'élastomère et du matériau de renfort utilisé, par exemple en consultant le « Product Selector Guide » pour les adhésifs Chemlok/Chemosil de la société LORD.The family best suited to a flexible bracelet application is the family of elastomers, and possibly that of thermoplastics-elastomers (mixture of elastomer and thermoplastic generally called “TPE”). To facilitate the production of the bracelet strand, it is generally favorable to apply a chemical compound to the surface of the metal reinforcement which promotes the adhesion of the elastomer to the reinforcement. The compound will be selected according to the elastomer and the reinforcing material used, for example by consulting the “Product Selector Guide” for Chemlok / Chemosil adhesives from the LORD company.
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 described previously 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 attachment of the clasp.
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 pin system cooperating with pin holes. The strand may therefore include a reinforcement extending from the box attachment to the buckle attachment or a reinforcement extending from the box attachment to the tongue 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.In this document, the term “connecting
Claims (12)
- A watch strap strip (1) comprising a reinforcement (2; 2') and a casing (3) made from an elastomer material and molded onto the reinforcement such that the reinforcement (2; 2') is housed in the casing (3), characterized in that the reinforcement includes a linking element (4; 4') mechanically connecting or mechanically securing:- an element (10; 6; 10') for fixing the strip to a watch case,- to an element (9; 5) for fixing the strip to a closure element,the linking element comprising a blade, the element for fixing the strip to the watch case including a first tube (10) fixed to the blade by soldering or brazing (19) and the element for fixing the strip to the closure element including a second tube (9) fixed to the blade by soldering or brazing.
- The strip as claimed in the preceding claim, characterized in that the blade is a metallic blade or a metallic blade made from a superelastic alloy.
- The strip as claimed in one of the preceding claims, characterized in that 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 strip as claimed in one of the preceding claims, characterized in that the linking element has a cross-section of which the geometry, in particular the width of the cross-section and/or the thickness of the cross-section, changes along the strip or the reinforcement.
- The strip as claimed in one of the preceding claims, characterized in that the linking element (4) is fixed directly at its extremity to the element (10) for fixing the strip to the watch case and/or to the element (9) for fixing the strip to the closure element.
- The strip as claimed in one of the preceding claims, characterized in that the blade is 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 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.
- The strip as claimed in one of the preceding claims, characterized in that the first tube (10) has an excess thickness and/or a groove intended to receive an extremity of the blade and/or the second tube (9) has an excess thickness and/or a groove intended to receive an extremity of the blade.
- The strap strip as claimed in one of the preceding claims, characterized in that the casing includes at least one opening (30) revealing the reinforcement.
- The strap strip as claimed in one of the preceding claims, characterized 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, in particular a profile that is constant over at least a part of the strip, for example over the half of the strip close to the closure element.
- The strap strip as claimed in one of the preceding claims, characterized in that characteristic values for the inertias and/or the geometries of the sections of 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 the preceding claims.
- A watch including at least one strap strip as claimed in one of claims 1 to 10.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14173541.5A EP2783592B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
EP21166514.6A EP3861884A1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strand |
EP12713859.2A EP2693910B1 (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 | ||
PCT/CH2012/000080 WO2012135967A1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
EP12713859.2A EP2693910B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
Related Child Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21166514.6A Division EP3861884A1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strand |
EP21166514.6A Division-Into EP3861884A1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strand |
EP14173541.5A Division EP2783592B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
EP14173541.5A Division-Into EP2783592B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2693910A1 EP2693910A1 (en) | 2014-02-12 |
EP2693910B1 true EP2693910B1 (en) | 2021-05-05 |
Family
ID=46968510
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12713859.2A Active EP2693910B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
EP21166514.6A Pending EP3861884A1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strand |
EP14173541.5A Active EP2783592B1 (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 |
EP14173541.5A Active EP2783592B1 (en) | 2011-04-06 | 2012-04-05 | Watch strap strip |
Country Status (5)
Country | Link |
---|---|
US (1) | US9516928B2 (en) |
EP (3) | EP2693910B1 (en) |
JP (1) | JP6081443B2 (en) |
CN (1) | CN103561606B (en) |
WO (1) | WO2012135967A1 (en) |
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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
- 2012-04-05 JP JP2014502967A patent/JP6081443B2/en active Active
- 2012-04-05 CN CN201280016786.5A patent/CN103561606B/en active Active
- 2012-04-05 WO PCT/CH2012/000080 patent/WO2012135967A1/en active Application Filing
- 2012-04-05 US US14/004,740 patent/US9516928B2/en active Active
- 2012-04-05 EP EP12713859.2A patent/EP2693910B1/en active Active
- 2012-04-05 EP EP21166514.6A patent/EP3861884A1/en active Pending
- 2012-04-05 EP EP14173541.5A patent/EP2783592B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
JP6081443B2 (en) | 2017-02-15 |
EP2693910A1 (en) | 2014-02-12 |
WO2012135967A1 (en) | 2012-10-11 |
EP3861884A1 (en) | 2021-08-11 |
CN103561606B (en) | 2016-12-28 |
EP2783592A1 (en) | 2014-10-01 |
US20140053602A1 (en) | 2014-02-27 |
CN103561606A (en) | 2014-02-05 |
EP2783592B1 (en) | 2017-08-16 |
US9516928B2 (en) | 2016-12-13 |
JP2014509914A (en) | 2014-04-24 |
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