EP4154752A1 - Erweiterbare komfortlasche - Google Patents

Erweiterbare komfortlasche Download PDF

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Publication number
EP4154752A1
EP4154752A1 EP21199004.9A EP21199004A EP4154752A1 EP 4154752 A1 EP4154752 A1 EP 4154752A1 EP 21199004 A EP21199004 A EP 21199004A EP 4154752 A1 EP4154752 A1 EP 4154752A1
Authority
EP
European Patent Office
Prior art keywords
bracelet
slide
frame
length adjustment
central
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.)
Pending
Application number
EP21199004.9A
Other languages
English (en)
French (fr)
Inventor
Sergio Ventura
Alain Mavilla
Jérôme Biard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Roventa Henex SA
Original Assignee
Roventa Henex SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Roventa Henex SA filed Critical Roventa Henex SA
Priority to EP21199004.9A priority Critical patent/EP4154752A1/de
Publication of EP4154752A1 publication Critical patent/EP4154752A1/de
Pending legal-status Critical Current

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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
    • A44C5/02—Link constructions
    • A44C5/04—Link constructions extensible
    • A44C5/08—Link constructions extensible having separate links
    • 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
    • A44C5/02—Link constructions
    • A44C5/10—Link constructions not extensible
    • A44C5/107—Link constructions not extensible with links made of more than two elements including connecting elements

Definitions

  • the present invention relates to the field of watchmaking and jewelry, and in particular to bracelet links.
  • the useful length adjustment devices are most of the time integrated directly into a clasp, for example a clasp with a folding clasp. The adjustment is then generally made in the open position of the clasp.
  • the patent application EP3744209A thus discloses, for example, a bracelet with elastic links of particular structure using prestressed springs arranged between two hinge rods between central links and side links, and whose triggering threshold is defined by the weight of the bracelet itself.
  • the stroke of each link is however limited to less than one millimeter, which requires on the one hand the arrangement of a large number of links to obtain a sufficient automatic adjustment range for the elongation of the bracelet.
  • this solution requires a very particular arrangement of elastic elements capable of extending along the curvature of each central link, which significantly increases the manufacturing costs.
  • a drawback of this type of device is that it is relatively bulky and complex to mount; moreover, the elastic elements are not completely hidden under the blades of the folding clasp, which exposes them to pinching during the extension and retraction phases of the spring, the maximum stroke of which is relatively long. Then, the fact that the springs are not hermetically covered from below the clasp on the outside of the blades easily allows dust or other skin or rubber debris to penetrate under the clasp and thus deteriorate the proper functioning of the elastic adjustment mechanism. Finally, the constraints exerted in torsion on the spring to follow the curvature of the cover of the clasp are also disadvantageous in ensuring long-lasting performance in terms of reliable holding forces around the user's wrist.
  • An object of the present invention is to provide an alternative fine-tuning solution for a bracelet, which increases wearing comfort without requiring any operation by the wearer of the bracelet.
  • Yet another object of the present invention is to provide a solution for fine adjustment of the length of a bracelet whose reliability is guaranteed over time.
  • an automatic length adjustment device for a bracelet comprising a frame articulated around a first fixing axis and a connecting element articulated around a second fixing axis, characterized in that that the connecting element is connected to said frame by means of at least one elastic element and a slide, the elastic element being arranged longitudinally in a longitudinal insertion orifice passing through the slide.
  • Another advantage of the proposed solution relates to cost reduction, since it is possible to use standard springs.
  • Yet another advantage relates to the ease of integration into a standard link bracelet as an inter-segment element, or even into any other type of bracelet, for example, made of elastomer or leather, close to the clasp.
  • the automatic length adjustment device for bracelet according to the invention is characterized in that a housing is arranged in a central part of the frame to receive the slide which has a shape whose cross section corresponds to that of the housing of the frame, and is slidably mounted relative to the latter.
  • the device is completely invisible when the springs are not stretched, the slide fitting inside the frame replacing a link. Furthermore, the sliding movement of the slide is guided according to a single degree of freedom due to the correspondences of shape between the slide and the housing of the frame without having to require additional guide elements for this, which increases comfort on the to carry.
  • the automatic bracelet length adjustment device is characterized in that the slide is fixed to the connecting element.
  • the slide is configured as a simple extension of the male-type connecting element which is inserted into a female part of the frame constituted by its internal central housing, and the level of prominence of the slide outside the frame easily indicates the level length adjustment.
  • the automatic length adjustment device is characterized in that the slider is inserted into an opening of a central attachment piece of the connecting element, and fixed to the central attachment piece using a first bar, and that the elastic element is fixed on the one hand to the slide via a second bar, and to the frame via a third bar.
  • the automatic bracelet length adjustment device is characterized in that the slideway moves along a rectilinear course between a rest position and a position of maximum extension.
  • the stroke of the device for automatic length adjustment for bracelet according to the invention is between 3 mm and 5 mm.
  • the automatic bracelet length adjustment device is characterized in that the slide is moreover provided with an elastic pawl oriented vertically and arranged to be inserted into a groove central whose front end forms an abutment surface limiting the travel of the slide.
  • the automatic bracelet length adjustment device is characterized in that the elastic pawl is removably inserted into a vertical housing of the slide.
  • the device proposed for the extension of the size of the bracelet is of extremely simple and modular construction, which easily allows the replacement of the pawl only and not of the slide in its entirety, in particular within the framework of an after-sales service. of the proposed comfort link.
  • the device for automatic length adjustment for bracelet according to the invention is characterized in that the elastic element or elements are arranged to exert a restoring force of between 5 and 10 Newton. In this way, wearing comfort is optimal because the strength of the strap around the wrist is always sufficient to prevent any slippage.
  • the automatic length adjustment device for bracelet according to the invention is characterized in that the slide has a first longitudinal cylindrical through hole intended to receive a first elastic element and a second longitudinal through hole cylindrical intended to receive a second elastic element arranged symmetrically with respect to the longitudinal axis of the slide.
  • the doubling thus proposed of the elastic elements makes it possible to minimize the stresses on each of them during each adjustment of the length of the bracelet and thus to further increase the service life of the proposed automatic adjustment mechanism.
  • Another object of the present invention is to provide a bracelet solution that emulates the comfort of elastomer or leather, for example, in terms of elasticity, but while retaining the appearance of a rigid metal bracelet.
  • a bracelet comprising a series of central links and lateral links articulated with respect to one another, and which further comprises an automatic length adjustment device according to one of the claims previous ones, characterized in that the connecting element comprises a central attachment part connected to a first lateral link and a second lateral link by means of a first bar.
  • An advantage of such a solution is that it makes it possible to very easily integrate the automatic length adjustment device proposed in the context of the present invention into a traditional bracelet with metal links.
  • the central attachment piece has a shape corresponding to a central half-link.
  • the integration of the adjustment mechanism is carried out as transparently as possible vis-à-vis the other links of the bracelet.
  • the frame of the automatic length adjustment device has a first length substantially equal to a second length corresponding to that of the side links.
  • This variant also advantageously further conceals the automatic length adjustment device, the frame then fictitiously replacing a central link, and making the location of the automatic length adjustment device almost imperceptible to the naked eye.
  • the slide has a shape corresponding to that of a housing arranged in a central part of the frame, extending over a first width substantially corresponding to that of the central links of the bracelet, and over a third length less than or equal to the first length of the frame, so as to be able to lodge entirely in the housing of the frame and not visually generate an intermediate segment, during the extension of the length, which does not either not particularly conspicuous or unattractive compared to the rest of the bracelet.
  • the travel between a rest position and a position of maximum extension of the slide is defined as being substantially equal to half of a fourth length of a link central.
  • the bracelet is composed of metal links and the automatic length adjustment device is completely hidden in the bracelet, and the dimensions of the elements constituting the bracelet correspond to those of the articulated links of the bracelet.
  • the integration of the device is optimal both from an aesthetic and functional point of view, since the best possible performance in terms of automatic adjustment capacity is guaranteed using a modular device that can easily be integrated in a bracelet, and more particularly between the end of a strand and a clasp.
  • FIG. 1 is illustrates a three-dimensional view and from above of a bracelet part 100 in particular for a wristwatch which is articulated around central links 10, having a first width W 1 and a length Lo, as well as side links 12, having a second width W 2 as well as a second length L 2 .
  • the automatic length adjustment device 17 of the bracelet is represented, on the figure 1 , in a retracted position Po corresponding to a position where the elastic elements that it comprises are not stressed in extension, and therefore at rest. In this position, this device is entirely hidden in the bracelet and moreover, the ratio between the length L 0 of the central links and the first length L 1 of a frame 7 replacing a central link 10, is calculated in such a way that it goes the most visually unnoticed; in this figure, this ratio between L 1 and L 0 is approximately 1.5.
  • the frame 7 preferably has a total width W equal to that of the bracelet 100, and has a central part 70 whose width corresponds to the first width W 1 of the central links 10, and side parts 72 whose width corresponds to the second width W 2 of the side links.
  • the frame 7 is articulated around a first axis 9, which can connect it either to a clasp, or to other links of the bracelet 100, and its central part 70 is of parallelepipedal shape while its two lateral parts are of rounded like the side links 12 in order to visually integrate the automatic length adjustment device 17 as well as possible as an inter-segment element between consecutive links of the bracelet.
  • This frame 7 is connected to a central attachment piece 11, the shape of which is rounded on one side and straight on the other, corresponds to a half-link of length Lo/2 so that in the extended position P 1 shown on the picture 2 next, when the length of the extension stroke C corresponding to the level of maximum extension of the length of the bracelet is chosen to preferably also correspond to a substantially equivalent length L 0 /2 then the length L 0 of a link is emulated central 10 complete.
  • This attachment piece 11 is connected on either side to a first lateral link 12A and a second lateral link 12B via a first strip 2, the width of which corresponds to the total width W of the bracelet 100, to form an element of link 1, illustrated later on the picture 3 which constitutes an intermediate sub-assembly vis-à-vis the rest of the bracelet 100, to which it is articulated via a second axis 13, which also has a length equal to the total width W of the bracelet.
  • the second axis 13 of articulation crosses the other ends of the first side link 12A and of the second side link 12B with respect to those crossed by the first bar 2, as well as one end of a central link 10, itself connected, via its other end , with two side links 12 of the bracelet 100.
  • each of the first and second side links 12A and 12B respectively of the connecting element of the device automatic adjustment of the length 1 of the bracelet 100 correspond, in size and shape, to each of the side links 12 of the bracelet 100.
  • the frame 7 At one end of the frame 7, arranged close to the first axis 9 of fixing and articulation of the latter vis-à-vis a clasp or other elements of the bracelet, there is a third strip 8 extending over the entire width of the frame 7 intended to retain one end of one or more elastic elements 6 (hidden in this figure and visible only from the picture 3 next, also putting the second strip 4 of attachment from their end opposite to the slide 3, on the figure 2 next, showing the automatic length adjustment device 17 in the extended position P 1 ).
  • the attachment part 11 constitutes a kind of extension of the frame 7 in the retracted position P 0 or retracted where the entire mechanism used for the extension is thus almost invisible outside the AA demarcation line.
  • the maximum extension stroke C is chosen as being preferably between 3mm and 5mm, which corresponds to an extension smaller than the size of a link of the bracelet (central or lateral, which have a length rather of l 6 to 9 mm), but nevertheless sufficient to be able to adapt to significant relative variations in the size of the wrist, in the event of substantial changes in terms of temperature and humidity in particular, while corresponding to a variation of longer than the standard indexing steps available in a clasp (generally less than 2mm).
  • the proposed automatic length adjustment device guarantees continuous and instantaneous length adjustment according to need, for example in the event of a sudden temperature change, between a heated room and a particularly cold outdoor environment in winter, for example. .
  • wearing comfort is optimized with the aid of a device that is not bulky and simple to integrate into a bracelet, the aesthetic appearance of which blends perfectly into the latter, and the adjustment properties of which are at the same time improved.
  • This first bar 2 is also inserted into a first transverse fixing orifice 31 of the slide 3, so that the latter, moreover disposed in an insertion opening 111 of the attachment part 11, is thus secured to the connecting element 1, and fixed thereto without leaving any degree of mutual freedom.
  • the slide 3 is also connected to the frame 7 via two elastic elements 6, that is to say a first elastic element 6A and a second elastic element 6B, of which a first end is fixed to the frame and the other end is fixed to the slide 3 via a second strip 4, the length of which is substantially equal to the first width W 1 of the central links 10, and inserted into a second transverse fixing hole 32.
  • the first elastic element 6A has a first end 61A attached to the frame 7 via the third strip 8 and the second elastic element 6B also has a first end 61B attached to the frame 7 via the third strip 8, while the second end 62A of the first elastic element 6A as well as the second end 62B of the second elastic element 6B are attached to the slide 3 via the second bar 4 inserted into the second transverse fixing hole 32.
  • each c one of the first and second elastic elements 6A and 6B respectively are each inserted into a first through longitudinal insertion hole 36A and a second through longitudinal insertion hole 36B; more generally the elastic element 6 is arranged in a longitudinal through insertion hole 36 of the slide 3, of corresponding shape, here cylindrical for a standard spiral spring, and this in such a way as to minimize the friction, the operating clearances, and thereby maximizing operating efficiency while at the same time reducing wear. Furthermore, such a configuration makes it possible to operate the slide like a drawer, the return mechanism of which is completely hidden. In this way, the elastic elements as well as more generally the inside of the proposed length adjustment device are completely protected vis-à-vis the outside.
  • the arrow F materializing the return force exerted by the springs, the shape of which can be chosen as being completely standard, as well as the material, typically stainless steel.
  • the manufacturing constraints are reduced to the maximum and the costs as well.
  • the doubling of the elastic elements makes it possible to better distribute the stresses and to more easily adjust the intensity of the desired restoring force.
  • the slide 3 also has a “stack” shape, that is to say with a front surface 34 as well as a flat rear surface 33, and a parallelepipedic side surface 35 rounded at the edges, with a semi-cylindrical envelope.
  • the frame 7 has for its part a housing 71 of corresponding shape intended to receive the slide and which confines the latter to a rectilinear translation movement according to a single degree of freedom.
  • the slide has a third length L 3 preferably substantially equal to the first length L 1 of the frame.
  • an elastic pawl 5 intended to be integrated into the slide 3, and parallel in a central longitudinal groove 73 of the frame, at the bottom of the housing 71 provided for the slide 3.
  • This central groove 73 has a front stop 73B, visible on the picture 3 , as well as a rear stop 73A, visible on the figure 4 , the space between the front stop 73B and the rear stop 73A defining the extension stroke C of the slide 3 and thus the maximum possible extension level.
  • the elastic pawl 5 has a cylindrical body 50 inserted in a vertical pawl housing 37 arranged at the bottom of the slide 3, and an elastic stud 51 intended to be inserted into the central groove 73 of the housing 70 of the frame 7.
  • FIGS. 5A and 5B correspond to views in sagittal section along the BB axis visible on the picture 3 above and which constitutes an axis of symmetry for the automatic length adjustment device 17 proposed.
  • FIG 5A illustrates this device in the retracted position Po corresponding to the figure 1
  • the figure 5B corresponds to the extended position P 1 corresponding to the figure 2 .
  • the slide 3 is fixed in the insertion opening 111 via the first bar 2 which is inserted in the first transverse fixing hole 31, and is connected on the other hand to the elastic element 6; although it is a question here of the first and second elastic element 6A-6B, only the second elastic element 6B located behind the sagittal cutting plane BB is visible on the figures 5A and 5B .
  • the elastic element 6 formed by the first and second elastic elements 6A and 6B respectively is fixed to the slide using the second bar 4 inserted into the second transverse fixing hole 32.
  • the orifices and the fixing strips are jointly referenced for the sake of simplification and readability, hence the joint references “31/2” and “32/4” corresponding respectively to the first transverse fixing orifice 31 and the first strip 2, and the second transverse fixing hole 32 and the second strip 4.
  • This pawl 5 simply associated with the slide 3 is removably fixed therein in order to constitute an easily replaceable wear part, separately from the other constituent elements of the proposed automatic length adjustment device; at the same time, it dispenses with any other part to be mounted on the frame to define a stop limiting the level of extension of the springs and consequently the maximum possible elongation of the length of the bracelet and thus contributes to making the proposed solution the most compact and the least voluminous possible.

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EP21199004.9A 2021-09-24 2021-09-24 Erweiterbare komfortlasche Pending EP4154752A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21199004.9A EP4154752A1 (de) 2021-09-24 2021-09-24 Erweiterbare komfortlasche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21199004.9A EP4154752A1 (de) 2021-09-24 2021-09-24 Erweiterbare komfortlasche

Publications (1)

Publication Number Publication Date
EP4154752A1 true EP4154752A1 (de) 2023-03-29

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ID=77951612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21199004.9A Pending EP4154752A1 (de) 2021-09-24 2021-09-24 Erweiterbare komfortlasche

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EP (1) EP4154752A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2518507A (en) * 1949-01-11 1950-08-15 Kestenman Bros Mfg Co Expansible band or bracelet
US2744379A (en) * 1954-12-09 1956-05-08 Kestenman Bros Mfg Co Expansible band with dual purpose latch
US2848864A (en) * 1957-02-13 1958-08-26 Duchess Jewelry Mfg Corp Removable expansion bracelet link
EP2606762B1 (de) 2011-12-22 2015-08-12 Montres Tudor S.A. Armbandverschluss mit verschiedenen Längenregulierungen
EP3744209A1 (de) 2019-05-28 2020-12-02 Patek Philippe SA Genève Elastisches armband mit gliedern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2518507A (en) * 1949-01-11 1950-08-15 Kestenman Bros Mfg Co Expansible band or bracelet
US2744379A (en) * 1954-12-09 1956-05-08 Kestenman Bros Mfg Co Expansible band with dual purpose latch
US2848864A (en) * 1957-02-13 1958-08-26 Duchess Jewelry Mfg Corp Removable expansion bracelet link
EP2606762B1 (de) 2011-12-22 2015-08-12 Montres Tudor S.A. Armbandverschluss mit verschiedenen Längenregulierungen
EP3744209A1 (de) 2019-05-28 2020-12-02 Patek Philippe SA Genève Elastisches armband mit gliedern

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