EP3958067A1 - Dispositif de fixation d'un fond sur une carrure pour piece d'horlogerie - Google Patents

Dispositif de fixation d'un fond sur une carrure pour piece d'horlogerie Download PDF

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Publication number
EP3958067A1
EP3958067A1 EP20191389.4A EP20191389A EP3958067A1 EP 3958067 A1 EP3958067 A1 EP 3958067A1 EP 20191389 A EP20191389 A EP 20191389A EP 3958067 A1 EP3958067 A1 EP 3958067A1
Authority
EP
European Patent Office
Prior art keywords
pin
groove
bump
caseback
caseband
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
EP20191389.4A
Other languages
German (de)
English (en)
French (fr)
Inventor
M. Joël ALLIMANN
Benjamin CHARTREL
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.)
Swatch Group Research and Development SA
Original Assignee
Swatch Group Research and Development 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 Swatch Group Research and Development SA filed Critical Swatch Group Research and Development SA
Priority to EP20191389.4A priority Critical patent/EP3958067A1/fr
Priority to US17/375,398 priority patent/US11774912B2/en
Priority to JP2021118410A priority patent/JP7252279B2/ja
Priority to CN202110944067.0A priority patent/CN114077188B/zh
Publication of EP3958067A1 publication Critical patent/EP3958067A1/fr
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/08—Hermetic sealing of openings, joints, passages or slits
    • G04B37/11—Hermetic sealing of openings, joints, passages or slits of the back cover of pocket or wrist watches
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/0008—Cases for pocket watches and wrist watches
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/08—Hermetic sealing of openings, joints, passages or slits
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/0008—Cases for pocket watches and wrist watches
    • G04B37/0033—Cases for pocket watches and wrist watches with cover or bottom which can slide or turn (without a spring action)

Definitions

  • the invention relates to a device for fixing a caseback to a middle part of a watch.
  • the invention also relates to a timepiece, in particular a watch, comprising such a device.
  • the dressing of watches and similar devices is subject to numerous constraints, in particular sealing, robustness, appearance, and must be carried out in such a way as to prevent any involuntary dismantling resulting irremediably in an after-sales intervention to exchange of seals, cleaning, lubrication, even repair.
  • trim or control components must still be indexed angularly with respect to each other, for markings of the original reference position, of rest, or of actuation, or even to facilitate the reading of indications or graduations, or to ensure the continuity of uneven surfaces and/or decorations. This angular indexing is often tricky to do well, in combination with good tightening of the components and perfect sealing of the joints.
  • the invention proposes to produce a sealed and secure assembly of trim components with easy-to-perform angular indexing.
  • the invention relates to a device for fixing a back to a caseband according to claim 1.
  • the invention also relates to a timepiece comprising such a fixing device.
  • the invention proposes to produce a sealed and secure assembly of trim components with easy-to-perform angular indexing, and in a guaranteed position, and this with a minimum number of components.
  • the figures 1 to 5b illustrate the non-limiting example of mounting and angular indexing of a back relative to a watch middle.
  • the invention relates to a device 100 for fixing a back 2 to a caseband 1 of a watch comprising at least one pin 4 integral with the caseband, a seal mounted on the caseback, said caseback comprising, close to its periphery, at least one groove arranged to cooperate with the pin.
  • the bottom 2 comprises, close to its periphery, at least one groove 5, the pin 4 being arranged to slide in the groove 5 between a first position, called the insertion position in which the bottom 2 is free, and a second position said locking position in which the back 2 is locked and positioned angularly with respect to the middle part 1, and in that the said groove 5 comprises at least one bump 55 to form a hard point and increase the torque during the passage of the pin 4 to the bump level 55.
  • the bottom 2 is arranged to pass from a first disassembled insertion position to a second assembled and locked position. As illustrated at figure 2a , the bottom 2 has a shoulder 20 forming a cover 21 arranged to completely cover in part with the middle part 1 and a body 22 arranged to rest in the middle part.
  • middle 1 and back 2 In the first disassembled insertion position, middle 1 and back 2 have a first angular orientation relative to each other.
  • the back 2 comprises sealing means, such as an O-ring gasket 3, at the interface between the caseband and the back, the back having a groove to receive the gasket.
  • sealing means such as an O-ring gasket 3
  • O-ring gasket 3 at the interface between the caseband and the back, the back having a groove to receive the gasket.
  • the caseband and the back In the second assembled and locked position, the caseband and the back have relative to each other a second angular orientation different from the first angular orientation.
  • the back 2 and the middle 1 are held axially by means of a bayonet fitting.
  • the attachment of the back and the caseband by bayonet adjustment, in particular around an axial direction D is reversible, and allows their dismantling.
  • this dismantling requires on the part of an operator efforts similar to those exerted during assembly, this dismantling preferably requires the use of a special tool, cooperating for example with holes or peripheral notches arranged on the visible face of the bottom 2.
  • Such an assembly makes it possible to avoid dismantling of the bottom by the wearer, or dismantling following clumsiness or impact.
  • this fixing device comprises at least a third component, a pin 4, which is arranged to be interposed axially between the back 2 and the middle part 1 and fixed in rotation with respect to one of them, and which comprises at least one elastically deformable zone.
  • This piece 4 comprises a head 40, a body 41 and a foot 42 and is integral with the middle part.
  • the body 41, the head 40 and the foot 42 are cylindrical in shape, the body 41 having a diameter smaller than the diameters of the head 40 and the foot 42.
  • the diameter of the head 40 and the foot 42 is identical, but it could very well be different, one could also imagine different geometric shapes for the piece 4, such as a body 41 of parallelepiped shape with a square section.
  • the pin 4 is mounted in the middle part, the middle part 1 comprising for this purpose a machining 10 with an opening in the shape of an inverted T for receiving the pin 4, the opening of the machining 10 opening inside the caseband so as to make the assembly invisible.
  • the machining 10 having at least one rib 11, and preferably two ribs, on the wall of the body of the T so as to perform an assembly by clipping the pin 4 in the machining 10, the head of the pin being housed in the head of the T-shaped machining.
  • the pin 4 can be made of different materials such as polyoxymethylene, polyurethane, a polymer-based material, or even an elastomer, for example asutane ® or hytrel ® are known.
  • the material chosen makes it possible to determine the maximum tightening torque, thus a pin 4 authorizes a tightening torque of approximately 1.5 Nm, lower than that usual for a caseback screwed onto a caseband, for a conventional assembly.
  • the interest of such a pin 4, preferably in a polymer or similar elastic material, is its facility to accommodate it in a volume whose free space is limited, and where it is impossible to implant an element in complete safety. metal that can break.
  • the body 41 of the pin 4 is deformable and is arranged to oppose a resistive torque of variable moment to any relative tangential torque between the back 2 and the middle 1.
  • the body 41 of the pin is arranged to cooperate with at least one complementary relief, such as a bump 55, which the bottom 2 comprises.
  • the bottom 2 has near the periphery of the cover 21 at least one groove 5 which extends along a radius of the bottom 2 and has a depth at least equal to half the height of the pin 4, and a width of dimension equivalent to the diameter of the body 41 of the pin 4 so that the pin 4 slides within the groove 5.
  • the groove 5 comprises a bottom 50, a first end 51 and a second end 52, and two walls 53, the bottom 50 of the groove being in the form of a groove 54 whose width is equivalent to the dimensions of the head or the foot of the pin 4 so as to guide the pin and hold it axially.
  • any passage of the pin 4 over the bump 55 in the groove 5 generates a resistive torque which tends to oppose the relative rotational movement between the middle 1 and the back 2.
  • the groove 5 comprises a plurality of bumps 55, which are arranged to oppose a successive resistance during the passage of the pin 4.
  • the angular distance between the bumps 55 successive is decreasing so as to oppose an increasing resistance, during a rotation between the bottom 2 and the middle part 1.
  • the angular distance between the bumps 55 successive can also be provided constant so as to oppose a constant resistant torque.
  • one or more bumps 55 are present on a single side wall of the groove 5.
  • one or more bumps are arranged on the two side walls of the groove 5, the bumps of each wall being arranged opposite each other.
  • one or more bumps are arranged on the two side walls of the groove 5, the bumps of each wall being offset from each other.
  • the distance between oppositely positioned bumps can vary so as to provide a progressive resistive torque, as shown in Fig. figure 6 .
  • the first end 51 of the groove 5 forms a space for the introduction of the pin 4, and the second end 52 forms an abutment 6 and holds the pin 4 in position in the groove 5.
  • the first end 51 has dimensions similar to the head or the foot of the pawn 4, and the second end 52 has dimensions similar to the body of the pawn 4.
  • the resistant force is all the more important as the number of grooves 5, bumps 55 and complementary pins 4 in cooperation is high. It is therefore possible to play on the number of successive bumps, and/or on the number of pawns and grooves.
  • the back comprises three grooves distributed angularly in a regular manner
  • the caseband comprises three complementary pins.
  • the configuration can be reversed, with at least one groove machined in the middle part and at least one pin integral with the back.
  • the operator places the back on the caseband so as to match the foot of the peg(s) with the first end 51 of the groove(s) 5 so that the pegs fit therein.
  • the operator imparts a translational movement to the back 2 to place the cover 21 of the back 2 close to the lower edge 13 of the middle part 1, so that the pin comes into abutment against the back and thus ensures sealing thanks to the joint 3.
  • the pin has a height very slightly greater than the distance between the bottom of the forge and the cover of the back, which makes it possible to avoid contact between the bottom and the caseband, and a clearance of 0.02mm to 0.04mm is present between the back and the middle.
  • the first bump 55 cooperating with the pin is unique.
  • the throat comprises several bumps 55 so that the operator provides a force in jolts during rotation, the peak of the cumulative resistant torque increasing during each passage of hard point, to reach, at the indexing angle, the maximum value. The operator thus encounters a feeling of increasing resistance, up to the stop 52.
  • the bottom 2 comprises three grooves 55, distributed at 120°, each of the grooves being arranged to cooperate with a pin 4 complementary to the groove.
  • the case middle thus comprises three pins distributed at 120°, and the operator feels a single passage of hard point when the three pins at 120° pass a bump 55 simultaneously.
  • Sealing exists as soon as the back is in place on the caseband, and the mechanism according to the invention is arranged so that, as in the previous case of a single hump, the securing of the sealing of the joint(s) tightness is ensured as soon as the back is inserted into the caseband, and then no loosening can occur without voluntary action by an operator.
  • the invention requires, during assembly, the successive crossing of several bumps so as to form an increasing resistance, but also during disassembly, because, from the final indexed position, in particular on the mechanical stop, any application of a force sudden result, in the worst case, by the crossing of a single bump 55, without total disassembly, with a visual shift, but above all without loss of tightness or risk of pollution of the interior of the watch.
  • the operator even when the operator successively crosses three thresholds, visible optically due to the offset, sealing is still ensured.
  • the operator must partially remove the bottom so that the gasket is no longer compressed, the gasket not being impacted by the rotation of the bottom.
  • the distance between each bump 55 is identical, and its passage opposes the same resistive torque.
  • the distance between each bump is decreasing, and the operator must apply an increasing torque, as in the example of the three bumps 55 of the picture 3a .
  • the invention is advantageous because it is perfectly compatible with watchmaking dimensions, while having a capacity for a high resistant force, which can reach a few N.m.
  • the dismantling of the mechanism according to the invention requires the maintenance of the application of a possible effort of accidental origin during a race large angle, from 5 to 10° for overcoming a single bump in the example shown, safety still remaining assured if several bumps follow one another.
  • the angular indexing is guaranteed by the second end 52 which forms a stop 6 for limiting travel.
  • the invention thus makes it possible to prevent any unexpected and involuntary dismantling of the case back, for example under the effect of vibrations, of successive expansion cycles, by inadvertent use of the carrier, or other.
  • the dismantling requires a special tool not marketed, which ensures the execution of the maintenance by after-sales personnel having the required qualifications.
  • the invention lends itself well to cases where the middle part and the back are made of different materials, with different coefficients of expansion, or even fragile or hard materials (ceramic, sapphire), which do not allow different modes of standard binding.
  • Examples of classic configurations include the assembly of a gold caseband with a sapphire back, or a case entirely in ceramic, a metal-ceramic combination, or the like.
  • An important advantage of the invention is to eliminate any contact/friction between the caseback and the middle part and thus prevent the appearance of residues due to friction and the addition of a grease to trap them as is the case in prior art.
  • Another important advantage of the invention is to provide increased security on opening thanks to the successive passage of several notches and the obligation to at least partially remove the bottom before any loss of tightness.
  • the invention also relates to a timepiece or watch 1000 comprising such a fixing device 100.
  • the invention makes it possible to have a fastening device whose design is not bulky, which ensures the maintenance of the tightness of the watch, which it protects against any accidental dismantling.
  • the invention also makes it possible to ensure the perfect orientation of a component held locked in its service position.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Connection Of Plates (AREA)
  • Electric Clocks (AREA)
  • Gasket Seals (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
EP20191389.4A 2020-08-17 2020-08-17 Dispositif de fixation d'un fond sur une carrure pour piece d'horlogerie Pending EP3958067A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP20191389.4A EP3958067A1 (fr) 2020-08-17 2020-08-17 Dispositif de fixation d'un fond sur une carrure pour piece d'horlogerie
US17/375,398 US11774912B2 (en) 2020-08-17 2021-07-14 Device for fastening a back on a middle for a timepiece
JP2021118410A JP7252279B2 (ja) 2020-08-17 2021-07-19 計時器のためのケースの胴部上に裏蓋を締結するデバイス
CN202110944067.0A CN114077188B (zh) 2020-08-17 2021-08-17 用于时计的用于将底盖紧固在中心件上的紧固设备

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20191389.4A EP3958067A1 (fr) 2020-08-17 2020-08-17 Dispositif de fixation d'un fond sur une carrure pour piece d'horlogerie

Publications (1)

Publication Number Publication Date
EP3958067A1 true EP3958067A1 (fr) 2022-02-23

Family

ID=72139536

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20191389.4A Pending EP3958067A1 (fr) 2020-08-17 2020-08-17 Dispositif de fixation d'un fond sur une carrure pour piece d'horlogerie

Country Status (4)

Country Link
US (1) US11774912B2 (ja)
EP (1) EP3958067A1 (ja)
JP (1) JP7252279B2 (ja)
CN (1) CN114077188B (ja)

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CH694110A5 (fr) * 2000-11-07 2004-07-15 Lea Dubois Montre comportant un boîtier et un support amovible.
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EP1249741A1 (fr) * 2001-04-12 2002-10-16 Yacht Diamond Watches Ltd. Boíte de montre munie d'une lunette décorative amovible
EP2874022A1 (fr) * 2013-11-15 2015-05-20 Chopard Technologies SA Boîte de montre comprenant une liaison à baïonnette
EP3599519A1 (fr) * 2018-07-24 2020-01-29 Etienne Amsler Ensemble de montre à boîte de montre amovible, montre et partie d'un tel ensemble de montre

Also Published As

Publication number Publication date
CN114077188B (zh) 2023-09-19
US20220050421A1 (en) 2022-02-17
JP7252279B2 (ja) 2023-04-04
JP2022033701A (ja) 2022-03-02
CN114077188A (zh) 2022-02-22
US11774912B2 (en) 2023-10-03

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