EP1133936A1 - Fastener for bracelet - Google Patents

Fastener for bracelet Download PDF

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Publication number
EP1133936A1
EP1133936A1 EP00105509A EP00105509A EP1133936A1 EP 1133936 A1 EP1133936 A1 EP 1133936A1 EP 00105509 A EP00105509 A EP 00105509A EP 00105509 A EP00105509 A EP 00105509A EP 1133936 A1 EP1133936 A1 EP 1133936A1
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EP
European Patent Office
Prior art keywords
axis
parts
clasp
magnet
cap
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Granted
Application number
EP00105509A
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German (de)
French (fr)
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EP1133936B1 (en
Inventor
M. Bernard c/o BMG Miserez Miserez
M. Michel Rataski
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Miserez Bernard M c/o BMG Miserez
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Miserez Bernard M c/o BMG Miserez
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Priority to EP20000105509 priority Critical patent/EP1133936B1/en
Publication of EP1133936A1 publication Critical patent/EP1133936A1/en
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Publication of EP1133936B1 publication Critical patent/EP1133936B1/en
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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
    • A44C5/18—Fasteners for straps, chains or the like
    • A44C5/20—Fasteners for straps, chains or the like for open straps, chains or the like
    • A44C5/2071—Fasteners for straps, chains or the like for open straps, chains or the like with the two ends of the strap or chain overlapping each other and fastened by an action perpendicularly to the main plane of these two ends
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44D—INDEXING SCHEME RELATING TO BUTTONS, PINS, BUCKLES OR SLIDE FASTENERS, AND TO JEWELLERY, BRACELETS OR OTHER PERSONAL ADORNMENTS
    • A44D2203/00—Fastening by use of magnets

Definitions

  • the magnetic members of the first and second pieces are arranged in so as to generate a force of attraction oriented along a second axis, perpendicular to the first axis and to the contact surfaces, the organs magnetic of one of the parts comprising a magnet.
  • the organs mechanical, together define a structure which, when the two parts are assembled, prevents their relative displacement along a third axis perpendicular to the other two.
  • a clasp of this type is described in document DE 35 03 389. It is formed of two parts, each provided with a magnetic organ and an organ mechanical. Each mechanical organ includes a finger and an eyelet, the finger of one engaging in the eyelet of the other. A spring locks the clasp, preventing fingers from coming out of the eyelets.
  • the pieces of magnetic material make it possible to position the two parts of the clasp, while the mechanical parts, and more especially the spring, lock the clasp. It is therefore necessary to move this spring to allow unlocking and thus separate the two parts of the clasp.
  • the spring is small, so it is difficult to handle.
  • the present invention has for purpose of making a clasp ensuring good attachment of the bracelet to the arm of the carrier, but which can be undone during a hanging.
  • This object is achieved thanks to the fact that the structure is arranged so that that it generates a movement of separation of the pieces along the second axis when they are moved relative to each other parallel to the first axis.
  • the organs mechanical include a key secured to the first part and a groove in the second part, the groove being shaped to receive the key, in which the key has the shape of a cylinder sector with a cylinder axis parallel to the third axis, a flat surface adjoining the first piece and a curved surface connecting the two ends of the surface flat, engaged in the groove and which forms, with the flat surface, an angle less than 90 °.
  • the simplest solution to make the key is to give it a shape sector registered in a cylinder of revolution.
  • the magnetic organs include, in in addition, a cap made of soft magnetic material, defining a housing in which is fixed the magnet and a plate made of soft magnetic material, arranged so as to be opposite the cap and completely cover it, the plate being secured to one of the parts and the cap of the other, while the magnet, of high remanence type and high coercive field is fixed so irremovable to one or the other of them.
  • the magnet is formed of a rare earth alloy.
  • the cap and the plate are made of ferritic steel.
  • FIG. 1 shows a watch being placed on the arm of a carrier.
  • This watch has a box 10 and a bracelet formed by two strands 12 and 14, integral with the box 10 by one of their ends.
  • Strands 12 and 14 respectively carry, at their other end, interior parts 16 and outer 18 together forming a clasp 20.
  • the watch is arranged on an arm, schematically represented by an ellipse 22, which defines an axis A-A, perpendicular to the drawing and corresponding to a line connecting the elbow to the wearer's hand.
  • the clasp according to the invention must perform two essential functions, namely a connection with the strands 12 and 14 of the bracelet, produced by connection means 24 and an assembly of the two pieces of the clasp, guaranteed by means assembly comprising more precisely assembly means magnetic 26 and mechanical assembly means 28 ( Figure 2).
  • the two parts 16 and 18 respectively have a body 30 and 32, for example in ferritic stainless steel.
  • Each body has a first part, identified by the letter a, of thickness substantially equal to that of the bracelet and a second part b, of smaller thickness.
  • Parts 30a and 32a are respectively adjacent to the strands 12 and 14. They form the means of link 24, defined by a hole in which a strip is engaged, not shown in the drawing, secured to the end of the respective strand of the bracelet.
  • the thinner parts 30b and 32b are intended to be overlapped when the clasp is closed. They carry the means magnetic 26 and mechanical assembly 28.
  • the body 30, in its part 30b, forms a frame 34 defining an opening in which a first magnetic member 36 is housed.
  • a first magnetic member 36 is housed.
  • This the latter is formed by a cap 38 defining, with its bottom and its walls, a housing, open towards room 18, in which there is a magnet 40, advantageously with a high coercive field and strong residual induction, advantageously of rare earth type. Its shape is such that it occupies completely this accommodation.
  • the body 32 in the part 18b, has an open recess in the direction of the part 16.
  • a second magnetic member 42 formed of a plate of soft magnetic material, of shape and position such that its periphery can completely cover the cap 38 when the two parts 16 and 18 are assembled.
  • the second member 42 on the one hand, the cap 38 and the magnet 40 on the other hand, define a contact surface 44 in which the generated force is exerted by the action of the magnet 40 on the plate forming the member 42.
  • This force is exercised along an axis B-B perpendicular to the contact surface 44 and to the axis A-A, oriented so that the two parts of the clasp are attracted one by the other.
  • the body 30 further comprises a groove 46, disposed between the part 30a and the bowl 38, the function of which will be specified below.
  • the body 32 is provided, at the free end of the part 18b, with a key 48, produced by stamping and having the shape of an inscribed cylindrical sector in a cylinder of revolution of axis C-C perpendicular to the axes A-A and B-B and the base of which is formed by the surface of the body 32 adjoining the recess, thus as can be seen in Figure 3.
  • the base and the cylindrical surface form, at their meeting point, an angle a equal to about 80 °. This angle is typically between 60 ° and 85 °.
  • Key 48 is dimensioned so that it can penetrate with a slight play in the groove 46, so that they together form the means mechanical assembly 28.
  • the two parts cannot be moved along the C-C axis, due to the key 48 engaged in the groove 46. In this way, the bracelet is maintained at wearer's arm.
  • Such a structure also makes it possible, in the event of the bracelet being hooked by a external object, to allow a setback, so as to prevent the carrier is not injured. Indeed, when hanging the bracelet, the force exercised always has a component along the axis A-A. This component causes the key 48 to move in the groove 46, which causes the spacing of parts 16 and 18, then their separation.
  • a neodymium magnet 40 having a length of 10 mm, a width of 4 mm and a thickness of 2.5 mm, magnetized along the axis B-B.
  • the cap 38 is made of any soft magnetic material. This genre generally tends to oxidize. To avoid this problem, it is covered with a protective layer, galvanically deposited by example.
  • the thicknesses of the wall of the cap 38 and of the plate 42 are chosen to so that the soft magnetic material which constitutes them is not saturated by the flux generated by the magnet 40.
  • the bodies 30 and 32 of the clasp are made of ferritic stainless steel, which is a soft magnetic material, the cap 38 can be reduced or even removed, the body 30 then comprising a recess in which the magnet 40 is housed.

Abstract

Clasp comprises an inner part (16) and an outer part (18). Each part has a connection piece (24) for connecting it to the links of the bracelet. The two parts connect using magnetic (26) and mechanical (28) elements. The magnetic force between first and second parts is along an axis (BB) that is perpendicular to the contact surface between the two parts, while the mechanical element prevents their displacement parallel to the contact surface.

Description

La présente invention concerne les fermoirs pour bracelet, du type formé de deux brins destinés à être reliés l'un à l'autre en vue de fixer le bracelet au bras d'un porteur, le bras définissant un premier axe. Le fermoir comporte deux pièces superposées, l'une intérieure, l'autre extérieure, en contact l'une avec l'autre par une surface de contact, et chacune solidaire de l'un des brins. Chaque pièce de ce fermoir comporte:

  • des moyens de liaison pour la relier à l'un des brins du bracelet, et
  • des moyens d'assemblage comprenant des organes magnétiques, et des organes mécaniques.
    • The present invention relates to bracelet clasps, of the type formed by two strands intended to be connected to one another in order to fix the bracelet to the arm of a wearer, the arm defining a first axis. The clasp has two superimposed parts, one inside, the other outside, in contact with each other by a contact surface, and each secured to one of the strands. Each piece of this clasp has:
  • connecting means for connecting it to one of the strands of the bracelet, and
  • assembly means comprising magnetic members, and mechanical members.

    • Les organes magnétiques des première et deuxième pièces sont agencés de manière à engendrer une force d'attraction orientée selon un deuxième axe, perpendiculaire au premier axe et aux surfaces de contact, les organes magnétiques de l'une des pièces comportant un aimant. De plus, les organes mécaniques définissent, ensemble, une structure qui, lorsque les deux pièces sont assemblées, empêche leur déplacement relatif selon un troisième axe perpendiculaire aux deux autres.The magnetic members of the first and second pieces are arranged in so as to generate a force of attraction oriented along a second axis, perpendicular to the first axis and to the contact surfaces, the organs magnetic of one of the parts comprising a magnet. In addition, the organs mechanical, together, define a structure which, when the two parts are assembled, prevents their relative displacement along a third axis perpendicular to the other two.

    Un fermoir de ce type est décrit dans le document DE 35 03 389. Il est formé de deux pièces, munies chacune d'un organe magnétique et d'un organe mécanique. Chaque organe mécanique comprend un doigt et un oeillet, le doigt de l'un s'engageant dans l'oeillet de l'autre. Un ressort assure le verrouillage du fermoir, empêchant les doigts de sortir des oeillets.A clasp of this type is described in document DE 35 03 389. It is formed of two parts, each provided with a magnetic organ and an organ mechanical. Each mechanical organ includes a finger and an eyelet, the finger of one engaging in the eyelet of the other. A spring locks the clasp, preventing fingers from coming out of the eyelets.

    Dans ce fermoir, les pièces en matériau magnétique permettent de positionner les deux parties du fermoir, alors que les organes mécaniques, et plus particulièrement le ressort, verrouillent le fermoir. Il est donc nécessaire de déplacer ce ressort pour permettre le déverrouillage et ainsi séparer les deux parties du fermoir. Le ressort est de petites dimensions, de sorte qu'il est difficile de le manipuler.In this clasp, the pieces of magnetic material make it possible to position the two parts of the clasp, while the mechanical parts, and more especially the spring, lock the clasp. It is therefore necessary to move this spring to allow unlocking and thus separate the two parts of the clasp. The spring is small, so it is difficult to handle.

    Une telle solution permet une fixation solide du bracelet. On a, malheureusement, constaté qu'avec un système aussi rigide, le porteur risquait de se blesser lorsqu'il s'accrochait par son bracelet. C'est pourquoi un verrouillage du fermoir peut s'avérer dangereux. La présente invention a pour but de réaliser un fermoir assurant une bonne fixation du bracelet au bras du porteur, mais qui peut se défaire lors d'un accrochage.Such a solution allows a solid fixation of the bracelet. We have, unfortunately, found that with such a rigid system, the wearer risked to injure himself when he hung on to his bracelet. This is why a locking the clasp can be dangerous. The present invention has for purpose of making a clasp ensuring good attachment of the bracelet to the arm of the carrier, but which can be undone during a hanging.

    Ce but est atteint grâce au fait que la structure est agencée de manière à ce qu'elle engendre un mouvement d'écartement des pièces selon le deuxième axe lorsqu'elles sont déplacées l'une par rapport à l'autre parallèlement au premier axe.This object is achieved thanks to the fact that the structure is arranged so that that it generates a movement of separation of the pieces along the second axis when they are moved relative to each other parallel to the first axis.

    Dans un mode de réalisation particulièrement avantageux, les organes mécaniques comprennent une clavette solidaire de la première pièce et une gorge pratiquée dans la seconde pièce, la gorge étant conformée pour recevoir la clavette, dans lequel la clavette a une forme de secteur de cylindre avec un axe de cylindre parallèle au troisième axe, une surface plane attenante à la première pièce et une surface courbe reliant les deux extrémités de la surface plane, engagée dans la gorge et qui forme, avec la surface plane, un angle inférieur à 90°.In a particularly advantageous embodiment, the organs mechanical include a key secured to the first part and a groove in the second part, the groove being shaped to receive the key, in which the key has the shape of a cylinder sector with a cylinder axis parallel to the third axis, a flat surface adjoining the first piece and a curved surface connecting the two ends of the surface flat, engaged in the groove and which forms, with the flat surface, an angle less than 90 °.

    Les essais ont montré que pour permettre, à la fois une bonne tenue et un décrochement facile, il est souhaitable que l'angle, défini par l'intersection de la surface plane et de la surface courbe, soit compris entre 60° et 85°.Tests have shown that to allow both good hold and easy detachment, it is desirable that the angle, defined by the intersection of the flat surface and curved surface, between 60 ° and 85 °.

    La solution la plus simple pour réaliser la clavette est de lui donner une forme de secteur inscrit dans un cylindre de révolution.The simplest solution to make the key is to give it a shape sector registered in a cylinder of revolution.

    Pour assurer une force de liaison suffisante entre les deux pièces, tout en évitant de faire un fermoir trop massif, les organes magnétiques comportent, en outre, une calotte en matériau magnétique doux, définissant un logement dans lequel est fixé l'aimant et une plaque en matériau magnétique doux, disposée de manière à se trouver en regard de la calotte et à la recouvrir complètement, la plaque étant solidaire de l'une des pièces et la calotte de l'autre, alors que l'aimant, de type à forte rémanence et haut champ coercitif est fixé de manière inamovible à l'une ou l'autre d'entre elles. Avantageusement, l'aimant est formé d'un alliage à base de terre rare.To ensure sufficient bonding strength between the two parts, while avoiding making a clasp that is too massive, the magnetic organs include, in in addition, a cap made of soft magnetic material, defining a housing in which is fixed the magnet and a plate made of soft magnetic material, arranged so as to be opposite the cap and completely cover it, the plate being secured to one of the parts and the cap of the other, while the magnet, of high remanence type and high coercive field is fixed so irremovable to one or the other of them. Advantageously, the magnet is formed of a rare earth alloy.

    Il est apparu qu'en fixant l'aimant de manière inamovible à l'intérieur de la calotte, il est protégé par celle-ci.It appeared that by fixing the magnet immovably inside the cap, it is protected by it.

    Afin d'éviter tout problème de corrosion, la calotte et la plaque, au moins, sont en acier ferritique.In order to avoid any corrosion problem, the cap and the plate, at least, are made of ferritic steel.

    D'autres avantages et caractéristiques de l'invention ressortiront de la description qui va suivre, faite en regard du dessin annexé, dans lequel:

  • La figure 1 est une vue de côté d'une montre ayant un bracelet muni d'un fermoir selon l'invention; et
  • Les figures 2 à 4 représentent des vues en coupe des deux pièces formant le fermoir, selon les lignes III-III et IV-IV de la figure 1.
    • Other advantages and characteristics of the invention will emerge from the description which follows, given with reference to the appended drawing, in which:
  • Figure 1 is a side view of a watch having a bracelet provided with a clasp according to the invention; and
  • Figures 2 to 4 show sectional views of the two pieces forming the clasp, along lines III-III and IV-IV of Figure 1.

    • La figure 1 représente une montre en cours de mise en place sur le bras d'un porteur. Cette montre comporte une boíte 10 et un bracelet formé de deux brins 12 et 14, solidaires de la boíte 10 par l'une de leurs extrémités. Les brins 12 et 14 portent respectivement, à leur autre extrémité, des pièces intérieure 16 et extérieure 18 formant ensemble un fermoir 20.Figure 1 shows a watch being placed on the arm of a carrier. This watch has a box 10 and a bracelet formed by two strands 12 and 14, integral with the box 10 by one of their ends. Strands 12 and 14 respectively carry, at their other end, interior parts 16 and outer 18 together forming a clasp 20.

    La montre est disposée sur un bras, schématiquement représenté par une ellipse 22, qui définit un axe A-A, perpendiculaire au dessin et correspondant à une ligne reliant le coude à la main du porteur.The watch is arranged on an arm, schematically represented by an ellipse 22, which defines an axis A-A, perpendicular to the drawing and corresponding to a line connecting the elbow to the wearer's hand.

    Le fermoir selon l'invention doit assurer deux fonctions essentielles, soit une liaison avec les brins 12 et 14 du bracelet, réalisée par des moyens de liaison 24 et un assemblage des deux pièces du fermoir, garanti par des moyens d'assemblage comportant plus précisément des moyens d'assemblage magnétiques 26 et des moyens d'assemblage mécaniques 28 (figure 2).The clasp according to the invention must perform two essential functions, namely a connection with the strands 12 and 14 of the bracelet, produced by connection means 24 and an assembly of the two pieces of the clasp, guaranteed by means assembly comprising more precisely assembly means magnetic 26 and mechanical assembly means 28 (Figure 2).

    Ainsi qu'on peut le voir plus particulièrement sur les figures 2 à 4, les deux pièces 16 et 18 comportent respectivement un corps 30 et 32, par exemple en acier inoxydable ferritique. Chaque corps comprend une première partie, identifiée par la lettre a, d'épaisseur sensiblement égale à celle du bracelet et une deuxième partie b, d'épaisseur plus faible. Les parties 30a et 32a sont respectivement adjacentes aux brins 12 et 14. Elles forment les moyens de liaison 24, définis par un trou dans lequel est engagée une barrette, non représentée au dessin, solidaire de l'extrémité du brin respectif du bracelet.As can be seen more particularly in Figures 2 to 4, the two parts 16 and 18 respectively have a body 30 and 32, for example in ferritic stainless steel. Each body has a first part, identified by the letter a, of thickness substantially equal to that of the bracelet and a second part b, of smaller thickness. Parts 30a and 32a are respectively adjacent to the strands 12 and 14. They form the means of link 24, defined by a hole in which a strip is engaged, not shown in the drawing, secured to the end of the respective strand of the bracelet.

    Les parties 30b et 32b, de plus faible épaisseur, sont destinées à être superposées lorsque le fermoir est fermé. Elles portent les moyens d'assemblage magnétiques 26 et mécaniques 28.The thinner parts 30b and 32b are intended to be overlapped when the clasp is closed. They carry the means magnetic 26 and mechanical assembly 28.

    Plus précisément, le corps 30, dans sa partie 30b, forme un cadre 34 définissant une ouverture dans laquelle un premier organe magnétique 36 est logé. Ce dernier est formé d'une calotte 38 définissant, avec son fond et ses parois, un logement, ouvert en direction de la pièce 18, dans lequel se trouve un aimant 40, avantageusement à haut champ coercitif et forte induction rémanente, avantageusement de type terres rares. Sa forme est telle qu'il occupe complètement ce logement.More specifically, the body 30, in its part 30b, forms a frame 34 defining an opening in which a first magnetic member 36 is housed. This the latter is formed by a cap 38 defining, with its bottom and its walls, a housing, open towards room 18, in which there is a magnet 40, advantageously with a high coercive field and strong residual induction, advantageously of rare earth type. Its shape is such that it occupies completely this accommodation.

    Le corps 32, dans la partie 18b, comporte une noyure ouverte en direction de la pièce 16. Dans cette noyure est logé un second organe magnétique 42 formé d'une plaque en matériau magnétique doux, de forme et de position telles que son pourtour puisse recouvrir totalement la calotte 38 lorsque les deux pièces 16 et 18 sont assemblées.The body 32, in the part 18b, has an open recess in the direction of the part 16. In this recess is housed a second magnetic member 42 formed of a plate of soft magnetic material, of shape and position such that its periphery can completely cover the cap 38 when the two parts 16 and 18 are assembled.

    Les deux organes 36 et 42 forment, ensemble, les moyens d'assemblage magnétique 26. The two members 36 and 42 together form the assembly means magnetic 26.

    Le second organe 42 d'une part, la calotte 38 et l'aimant 40 d'autre part, définissent une surface de contact 44 dans laquelle s'exerce la force engendrée par l'action de l'aimant 40 sur la plaque formant l'organe 42. Cette force est exercée selon un axe B-B perpendiculaire à la surface de contact 44 et à l'axe A-A, orientée de manière que les deux pièces du fermoir soient attirées l'une par l'autre.The second member 42 on the one hand, the cap 38 and the magnet 40 on the other hand, define a contact surface 44 in which the generated force is exerted by the action of the magnet 40 on the plate forming the member 42. This force is exercised along an axis B-B perpendicular to the contact surface 44 and to the axis A-A, oriented so that the two parts of the clasp are attracted one by the other.

    Le corps 30 comporte, en outre, une gorge 46, disposée entre la partie 30a et la cuvette 38, dont la fonction sera précisée plus loin.The body 30 further comprises a groove 46, disposed between the part 30a and the bowl 38, the function of which will be specified below.

    Le corps 32 est muni, à l'extrémité libre de la partie 18b, d'une clavette 48, réalisée par emboutissage et présentant une forme de secteur cylindrique inscrit dans un cylindre de révolution d'axe C-C perpendiculaire aux axes A-A et B-B et dont la base est formée par la surface du corps 32 attenante à la noyure, ainsi qu'on peut le voir sur la figure 3. La base et la surface cylindrique forment, à leur point de rencontre, un angle a égal à environ 80°. Cet angle est typiquement compris entre 60° et 85°.The body 32 is provided, at the free end of the part 18b, with a key 48, produced by stamping and having the shape of an inscribed cylindrical sector in a cylinder of revolution of axis C-C perpendicular to the axes A-A and B-B and the base of which is formed by the surface of the body 32 adjoining the recess, thus as can be seen in Figure 3. The base and the cylindrical surface form, at their meeting point, an angle a equal to about 80 °. This angle is typically between 60 ° and 85 °.

    La clavette 48 est dimensionnée de manière qu'elle puisse pénétrer avec un léger jeu dans la gorge 46, de sorte qu'ils forment ensemble les moyens d'assemblage mécanique 28.Key 48 is dimensioned so that it can penetrate with a slight play in the groove 46, so that they together form the means mechanical assembly 28.

    Pour mettre la montre munie d'un fermoir selon l'invention sur le poignet du porteur, il suffit de rapprocher la pièce extérieure 18 de la pièce intérieure 16. L'aimant 40 exerce alors une force d'attraction sur la plaque 42, jusqu'à amener cette dernière en contact avec le pourtour de la calotte 38. Durant cette opération, la clavette 48 pénètre dans la gorge 46. De la sorte, les deux pièces sont solidarisées l'une de l'autre, à cause de la force qu'exerce l'aimant 40 sur la plaque 42. Cette force est égale à environ 1N.To put the watch fitted with a clasp according to the invention on the wrist of the carrier, it suffices to bring the outer part 18 closer to the inner part 16. The magnet 40 then exerts a force of attraction on the plate 42, until bringing the latter in contact with the periphery of the cap 38. During this operation, the key 48 enters the groove 46. In this way, the two parts are joined to each other, because of the force exerted by the magnet 40 on the plate 42. This force is approximately 1N.

    Les deux pièces ne peuvent pas être déplacées selon l'axe C-C, à cause de la clavette 48 engagée dans la gorge 46. De la sorte, le bracelet est maintenu au bras du porteur. The two parts cannot be moved along the C-C axis, due to the key 48 engaged in the groove 46. In this way, the bracelet is maintained at wearer's arm.

    Pour ouvrir le fermoir, et ainsi permettre l'enlèvement de la montre, il suffit d'exercer une force parallèle à l'axe A-A. La surface cylindrique de la clavette 48 vient prendre appui contre le bord de la gorge 46. A cause de l'angle de raccordement a inférieur à 90°, la clavette tend à écarter l'un de l'autre les deux pièces 16 et 18, facilitant leur désengagement.To open the clasp, and thus allow the removal of the watch, it suffices to exert a force parallel to the axis A-A. The cylindrical surface of the key 48 comes to bear against the edge of the groove 46. Because of the angle of connection less than 90 °, the key tends to separate the two from one another parts 16 and 18, facilitating their disengagement.

    Une telle structure permet, en outre, en cas d'accrochage du bracelet par un objet extérieur, de permettre un décrochement, de manière à éviter que le porteur ne soit blessé. En effet, lors d'un accrochage du bracelet, la force exercée comporte toujours une composante selon l'axe A-A. Cette composante provoque le déplacement de la clavette 48 dans la gorge 46, ce qui provoque l'écartement des pièces 16 et 18, puis leur séparation.Such a structure also makes it possible, in the event of the bracelet being hooked by a external object, to allow a setback, so as to prevent the carrier is not injured. Indeed, when hanging the bracelet, the force exercised always has a component along the axis A-A. This component causes the key 48 to move in the groove 46, which causes the spacing of parts 16 and 18, then their separation.

    Pour réaliser un fermoir présentant des caractéristiques satisfaisantes, on peut utiliser un aimant 40 au néodyme ayant une longueur de 10 mm, une largeur de 4 mm et une épaisseur de 2,5 mm, aimanté selon l'axe B-B.To make a clasp with satisfactory characteristics, one can use a neodymium magnet 40 having a length of 10 mm, a width of 4 mm and a thickness of 2.5 mm, magnetized along the axis B-B.

    La calotte 38 est réalisé en n'importe quel matériau magnétique doux. Ce genre de matériaux tend, généralement, à s'oxyder. Pour éviter ce problème, il est recouvert d'une couche de protection, déposée par voie galvanique par exemple.The cap 38 is made of any soft magnetic material. This genre generally tends to oxidize. To avoid this problem, it is covered with a protective layer, galvanically deposited by example.

    Les épaisseurs de la paroi de la calotte 38 et de la plaque 42 sont choisies de manière à ce que le matériau magnétique doux qui les constitue ne soit pas saturé par le flux engendré par l'aimant 40.The thicknesses of the wall of the cap 38 and of the plate 42 are chosen to so that the soft magnetic material which constitutes them is not saturated by the flux generated by the magnet 40.

    Si les corps 30 et 32 du fermoir sont réalisés en acier inoxydable ferritique, qui est un matériau magnétique doux, la calotte 38 peut être réduite, voire supprimée, le corps 30 comportant alors une noyure dans laquelle l'aimant 40 est logé.If the bodies 30 and 32 of the clasp are made of ferritic stainless steel, which is a soft magnetic material, the cap 38 can be reduced or even removed, the body 30 then comprising a recess in which the magnet 40 is housed.

    Claims (8)

    Fermoir, pour bracelet formé de deux brins (12, 14) destinés à être reliés l'un à l'autre en vue de fixer le bracelet au bras (22) d'un porteur, le bras définissant un premier axe (A-A), ledit fermoir comportant deux pièces (16, 18) superposées, l'une (16) intérieure, l'autre (18) extérieure, en contact l'une avec l'autre par une surface de contact (44), dans lequel chaque pièce comporte: des moyens de liaison (24) pour la relier à l'un des brins du bracelet, des moyens d'assemblage comprenant des organes magnétiques (26), et des organes mécaniques (28), fermoir dans lequel les organes magnétiques (26) des première (16) et deuxième (18) pièces sont agencés de manière à engendrer une force d'attraction orientée selon un deuxième axe (B-B), perpendiculaire au premier axe (A-A) et à la surface de contact (44), les organes magnétiques (26) de l'une desdites pièces (16) comportant un aimant (40), et dans lequel les organes mécaniques (28) définissent, ensemble, une structure qui, lorsque les deux pièces (16, 18) sont assemblées, empêche leur déplacement relatif selon un troisième axe (C-C) perpendiculaire aux deux autres,
    caractérisé en ce que ladite structure est agencée de manière à ce qu'elle engendre un mouvement d'écartement des pièces (16, 18) selon le deuxième axe (B-B) lorsqu'elles sont déplacées l'une par rapport à l'autre parallèlement au premier axe (A-A).     Clasp, for a bracelet formed by two strands (12, 14) intended to be connected to one another in order to fix the bracelet to the arm (22) of a wearer, the arm defining a first axis (AA), said clasp comprising two superimposed parts (16, 18), one (16) inside, the other (18) outside, in contact with each other by a contact surface (44), in which each piece includes: connecting means (24) for connecting it to one of the strands of the bracelet, assembly means comprising magnetic members (26), and mechanical members (28), clasp in which the magnetic members (26) of the first (16) and second (18) parts are arranged so as to generate a force of attraction oriented along a second axis (BB), perpendicular to the first axis (AA) and to the contact surface (44), the magnetic members (26) of one of said parts (16) comprising a magnet (40), and in which the mechanical members (28) together define a structure which, when the two parts (16, 18) are assembled, prevents their relative displacement along a third axis (CC) perpendicular to the other two,
    characterized in that said structure is arranged so that it generates a movement of separation of the parts (16, 18) along the second axis (BB) when they are displaced relative to each other in parallel to the first axis (AA).         Fermoir selon la revendication 1, caractérisé en ce que les organes mécaniques (28) comprennent une clavette (48) solidaire l'une des pièces (18) et une gorge (46) pratiquée dans l'autre pièce (16), la gorge (46) étant conformée pour recevoir la clavette (48), dans lequel la clavette (48) a une forme de secteur de cylindre avec un axe de cylindre parallèle au troisième axe (C-C), une surface plane attenante à la pièce (18) dont elle est solidaire et une surface courbe reliant les deux extrémités de la surface plane, engagée dans ladite gorge (46) et qui forme, avec la surface plane, un angle (á) inférieur à 90°.Clasp according to claim 1, characterized in that the mechanical members (28) comprise a key (48) integral with one of the parts (18) and a groove (46) formed in the other part (16), the groove ( 46) being shaped to receive the key (48), in which the key (48) has the shape of a cylinder sector with a cylinder axis parallel to the third axis (CC), a flat surface adjoining the part (18) of which it is integral and a curved surface connecting the two ends of the planar surface, engaged in said groove (46) and which forms, with the planar surface, an angle (á) less than 90 °. Fermoir selon la revendication 2, caractérisé en ce que ledit angle (á) est compris entre 60° et 85°.Clasp according to claim 2, characterized in that said angle (á) is between 60 ° and 85 °. Fermoir selon la revendication 3, caractérisé en ce que ledit secteur s'inscrit dans un cylindre de révolution.Clasp according to claim 3, characterized in that said sector is inscribed in a cylinder of revolution. Fermoir selon l'une des revendications 1 à 4, caractérisé en ce que les organes magnétiques (26) comportent une calotte (38) en matériau magnétique doux, définissant un logement, dans lequel est engagée ledit aimant (40), et une plaque (42) en matériau magnétique doux, disposée de manière à se trouver en regard de ladite calotte (38) et à la recouvrir complètement, ladite plaque (42) étant solidaire de l'une desdits pièces et la calotte de l'autre, en ce que ledit aimant (40), de type à forte rémanence et haut champ coercitif, est fixé de manière inamovible à l'une (38) d'entre elles (38, 42). Clasp according to one of claims 1 to 4, characterized in that the magnetic members (26) comprise a cap (38) made of soft magnetic material, defining a housing, in which said magnet (40) is engaged, and a plate ( 42) made of soft magnetic material, arranged so as to lie opposite said cap (38) and to completely cover it, said plate (42) being integral with one of said parts and the cap on the other, in that that said magnet (40), of the high remanence and high coercive field type, is fixed irremovably to one (38) of them (38, 42). Fermoir selon la revendication 5, caractérisé en ce que ledit aimant (40) est formé d'un alliage à base de terre rare.Clasp according to claim 5, characterized in that said magnet (40) is formed from an alloy based on rare earth. Fermoir selon l'une des revendications 5 et 6, caractérisé en ce que ledit aimant (40) est fixé de manière inamovible à l'intérieur de ladite calotte (38).Clasp according to one of claims 5 and 6, characterized in that said magnet (40) is fixed in a non-removable manner inside said cap (38). Fermoir selon l'une des revendications 5 à 7, caractérisé en ce qu'au moins ladite calotte (38) et ladite plaque (42) sont en acier ferritique.Clasp according to one of claims 5 to 7, characterized in that at least said cap (38) and said plate (42) are made of ferritic steel.
    EP20000105509 2000-03-15 2000-03-15 Fastener for bracelet Expired - Lifetime EP1133936B1 (en)

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    EP20000105509 EP1133936B1 (en) 2000-03-15 2000-03-15 Fastener for bracelet

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    EP1133936A1 true EP1133936A1 (en) 2001-09-19
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    AT504950B1 (en) * 2007-02-22 2008-12-15 Langer Gmbh JEWELERY BUCKLE
    WO2009046387A1 (en) * 2007-10-04 2009-04-09 Theresa Headley Improved connecting device using a magnet
    US9432091B2 (en) 2013-03-04 2016-08-30 Hello Inc. Telemetry system with wireless power receiver and monitoring devices
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    US9339188B2 (en) 2013-03-04 2016-05-17 James Proud Methods from monitoring health, wellness and fitness with feedback
    US9345404B2 (en) 2013-03-04 2016-05-24 Hello Inc. Mobile device that monitors an individuals activities, behaviors, habits or health parameters
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    US9361572B2 (en) 2013-03-04 2016-06-07 Hello Inc. Wearable device with magnets positioned at opposing ends and overlapped from one side to another
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    US9756403B2 (en) 2013-03-04 2017-09-05 Hello Inc. Monitoring device with selectable wireless communication
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    US9662015B2 (en) 2013-03-04 2017-05-30 Hello Inc. System or device with wearable devices having one or more sensors with assignment of a wearable device user identifier to a wearable device user
    US9704209B2 (en) 2013-03-04 2017-07-11 Hello Inc. Monitoring system and device with sensors and user profiles based on biometric user information
    US9737214B2 (en) 2013-03-04 2017-08-22 Hello Inc. Wireless monitoring of patient exercise and lifestyle
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    US10058290B1 (en) 2013-06-21 2018-08-28 Fitbit, Inc. Monitoring device with voice interaction
    US9993197B2 (en) 2013-06-21 2018-06-12 Fitbit, Inc. Patient monitoring systems and messages that send alerts to patients only when the patient is awake
    US9993166B1 (en) 2013-06-21 2018-06-12 Fitbit, Inc. Monitoring device using radar and measuring motion with a non-contact device
    US10117504B2 (en) 2014-08-09 2018-11-06 Apple Inc. Wearable band including magnets
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    CN106990709A (en) * 2017-05-18 2017-07-28 广东小天才科技有限公司 A kind of Intelligent worn device and its watchband fast-falling method
    CN107252164A (en) * 2017-07-26 2017-10-17 广东小天才科技有限公司 A kind of watchband structure and the intelligent watch with the watchband structure
    CN107252164B (en) * 2017-07-26 2023-11-24 广东小天才科技有限公司 Watchband structure and intelligent watch with watchband structure
    CN113825425A (en) * 2019-05-22 2021-12-21 苹果公司 Wristband with magnetic coupling
    US11944167B2 (en) 2019-05-22 2024-04-02 Apple Inc. Wristbands with magnetic coupling
    CN111134429A (en) * 2020-03-16 2020-05-12 东莞市亿丰钟表有限公司 Magnet mesh belt buckle

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