EP4194967A1 - Vorrichtung zur befestigung eines bodens auf einem gehäuserahmen einer uhr - Google Patents

Vorrichtung zur befestigung eines bodens auf einem gehäuserahmen einer uhr Download PDF

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Publication number
EP4194967A1
EP4194967A1 EP21212693.2A EP21212693A EP4194967A1 EP 4194967 A1 EP4194967 A1 EP 4194967A1 EP 21212693 A EP21212693 A EP 21212693A EP 4194967 A1 EP4194967 A1 EP 4194967A1
Authority
EP
European Patent Office
Prior art keywords
pin
groove
ring
bump
fixing device
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
EP21212693.2A
Other languages
English (en)
French (fr)
Inventor
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 EP21212693.2A priority Critical patent/EP4194967A1/de
Priority to US17/952,689 priority patent/US20230176525A1/en
Priority to JP2022160023A priority patent/JP7465932B2/ja
Priority to CN202211332421.5A priority patent/CN116243582A/zh
Publication of EP4194967A1 publication Critical patent/EP4194967A1/de
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
    • 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
    • G04B37/0008—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)
    • 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

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 disassembly resulting irremediably in an after-sales intervention for 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 caseback to the middle part of a watch, the caseback having a shoulder forming a lid arranged to cover in whole in part with the middle part and a body arranged to rest in the middle part, said device comprising a ring mounted between the back and the middle part and secured to the latter, and at least one pin secured to the back and arranged to cooperate with the ring and the caseband.
  • said ring comprises at least one groove arranged to cooperate with the pin, said pin being able to slide in the groove between a first position, called the insertion position in which the bottom is free, and a second position called locking position in which the back is locked and positioned angularly with respect to the middle part, and in that said groove comprises at least one bump to form a hard point and increase the torque when the pin passes at the level of the bump.
  • 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 3c 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 middle part 1 of a watch comprising a ring 3 mounted in the middle part, at least one pin 4 secured to the back and arranged to cooperate with the ring 3, and a seal mounted on the back 2.
  • the reverse mounting is of course possible, and the pin 4 can be mounted on the caseband 1 while the ring 3 is mounted on the back 2 which can be solid or transparent.
  • the bottom 2 is arranged to move from a first disassembled insertion position to a second assembled and locked position. As illustrated at figure 2a , the bottom 2 has a shoulder 21, slightly raised relative to the lid and forming a groove 20 at the periphery of the bottom. The bottom 2 is arranged to cover all or part of the caseband 1 and comprises a body 22 arranged to rest in the empty space 14 of the middle part 1.
  • this fixing device comprises at least one pin 4, which is arranged to be inserted axially between the back 2 and the middle part 1, fixed in rotation with respect to one of them, and which slides in a groove 5 of the ring 3.
  • This peg 4 comprises a head 40 provided with a slot 41, a body 42 and a foot 43, the peg 4 being screwed into the bottom 2 so as to make it integral with the latter.
  • the body 42, the head 40 and the foot 43 are cylindrical in shape, the head 40 having a diameter greater than the diameters of the body 42 and the foot 43.
  • the pin 4 is screwed onto the bottom 2, the bottom 2 comprising for this purpose at least one threaded hole to receive the foot 43 of the pin 4.
  • the pin 4 is preferably made of a metallic material or a metal alloy such as steel. Of course, shapes other than a slot could be used to fix the pin, such as a star or a cross for example.
  • the ring 3 is formed by a ring 30 and comprises at least one groove 5 arranged to cooperate with the pin 4, 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 called the locking position in which the bottom 2 is locked and positioned angularly with respect to the middle part 1, the groove 5 comprising at least one bump 55 to form a hard point and increase the torque when passing of the pin 4 at the level of the bump 55.
  • Such an arrangement also provides security against loosening and consequently the loss of tightness.
  • this portion In order to make the ring portion receiving the groove 5 more rigid, this portion has a greater width than the rest of the ring so that the ring 5 is compressed between the bottom 2 and the middle part 1 at this larger portion. wide.
  • the ring 3 can be made of a material chosen from: polyoxymethylene, polyurethane, a polymer-based material, or even an elastomer, for example asutane ® or hytrel ® are known.
  • the material chosen, the geometry of interference with the pin as well as the material of the pin make it possible to determine the maximum tightening torque.
  • the interest of such a ring 3, preferably in a polymer or similar elastic material, is its ease of manufacturing and replacing it in the event of breakage or wear.
  • the ring 3 is fixed to the caseband 1 via screws 6 passing through the ring 3 via holes 31 and screwed into holes 13 of the caseband 1.
  • the heads of the screws 6 rest in a counterbore formed at the level of the holes 31 and on the surface of the ring 3.
  • the ring 3 rests against the bottom 12 and the wall 11 of a shoulder 10 of the middle part 1, the shoulder having similar dimensions to the ring so that the surface of the ring 3 flush with the edges of the middle part 1.
  • the bottom 12 of the shoulder 10 has at least one recess 15 extending along a radius of the middle part, the position of the recess 15 corresponding to the position of the groove 5 of the ring once it is mounted.
  • the width of the recess 15 is provided greater than the width of the groove 5, the width of the groove is equivalent to the dimensions of the body 42 of the pin 4 and the width of the recess 15 is at least equivalent to the width of the head 40 of pin 4 so that pin 4 can move in recess 15 and hold it axially in groove 5. It should be noted that the length of recess 15 defines the stroke length of pin 4.
  • 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 radial sealing means, such as an O-ring gasket (not shown in the figures), at the level of the interface between the middle part 1 and the back 2, the gasket resting in the groove 20 of the cover and thus filling the space formed by the shoulder 21 at the periphery of the bottom.
  • radial sealing means such as an O-ring gasket (not shown in the figures)
  • middle 1 and back 2 In the second assembled and locked position, middle 1 and back 2 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 joining of the back 2 and the middle part 1 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 disassembly of the bottom by the wearer, or disassembly following a clumsiness or a shock.
  • the body 42 of the pin is arranged to cooperate with at least one complementary relief, such as a bump 55, which the groove 5 of the ring 3 comprises.
  • the ring 3 comprises at least one groove 5 which extends along a radius of the ring 3 and has a width of dimension equivalent to the diameter of the body 42 of the pin 4 so that the pin 4 slides within the groove 5.
  • the groove 5 comprises a first end 51 and a second end 52, and two walls 53.
  • 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 successive resistance during the passage of the pin 4.
  • the angular distance between the successive bumps 55 is decreasing so as to oppose an increasing resistance, during a rotation between the back 2 and the middle part 1.
  • the angular distance between the successive bumps 55 can also be provided constant in such a way to oppose a constant resistive torque.
  • one or more bumps 55 are present on a single side wall of the groove 5.
  • one or more bumps 55 are arranged on the two side walls of the groove 5, the bumps 55 of each wall being arranged opposite each other.
  • one or more bumps 55 are arranged on the two side walls of the groove 5, the bumps 55 of each wall being offset with respect to each other.
  • the distance between bumps 55 positioned opposite each other can vary so as to provide a progressive resistant torque.
  • the first end 51 of the groove 5 forms a space for the introduction of the head 40 of the pin 4, and the second end 52 forms an abutment and keeps the pin 4 in position in the groove 5.
  • the first end 51 has dimensions slightly larger than the head 40 of the pawn 4, and the second end 52 has similar dimensions (within the manufacturing tolerance) to the body 42 of the pawn 4.
  • the resistant force is all the more important as the number of grooves 5, of bumps 55, the dimensions of the bumps, and of complementary pawns 4 in cooperation is high. It is therefore possible to play on the number of successive bumps 55, and/or on the number of pawns and grooves.
  • the ring 3 comprises three grooves 5 distributed angularly in a regular manner, and the bottom 2 comprises three complementary pins 4.
  • the operator places the back 2 on the middle part 1 so as to match the head 40 of the pin(s) 4 with the first end 51 of the groove(s) 5 so that the pin(s) 4 fit there. insert when the operator imparts a translational movement along the axis D to the back 2 to place the cover 20 of the back 2 close to the lower edge 16 of the middle part 1, until the pin comes into abutment against the bottom of the recess 15 and thus ensure sealing through the gasket.
  • the friction of the o-ring seal provides initial resistance.
  • the pin 4 has a height very slightly greater than the distance between the bottom of the recess 15 and the bottom 2, which makes it possible to avoid contact between the bottom 2 and the caseband 1, and a clearance of 0.02mm to 0.04mm is present between the back and the middle.
  • the operator prints a progressive torque to print the relative rotation between the caseband 1 and the back 2, during this rotation, the operator carrying out the assembly encounters a second resistance when the body 42 of the pin 4 is put into cooperation. with the first bump 55 of the groove 5.
  • the resistant torque progresses during the complete passage of the bump 55.
  • the first bump 55 cooperating with the pin 4 is unique.
  • the groove 5 comprises several bumps 55 so that the operator provides a force jerkily during the 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 due to the fact of the bumps and the “pawn-bump” interference which is stronger as the box is closed by turning the bottom.
  • the ring 3 comprises three grooves 5, distributed at 120°, each of the grooves 5 being arranged to cooperate with a pin 4 complementary to the groove 5.
  • the bottom 2 thus comprises three pins 4 distributed at 120°, and the operator feels a single passage of hard point when the three pawns 4 at 120° pass a bump 55 simultaneously.
  • the seal exists as soon as the case back 2 is put in place on the caseband 1, and the mechanism according to the invention is arranged so that, as in the previous case of a single bump, the securing of the seal of the joint is ensured as soon as the back is inserted into the caseband, and then that 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 dismantling, 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, and especially 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 because of the offset, sealing is still ensured. To have a loss of tightness, the operator must partially remove the bottom 2 so that the gasket is no longer compressed.
  • 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.
  • the invention is advantageous because it is perfectly compatible with watchmaking dimensions, while having a capacity for high resistant force, which can reach 1.2Nm ⁇ 0.2Nm depending on the watch diameters.
  • 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 stroke limiting stop.
  • 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 comprising such a fixing device.
  • the invention makes it possible to have a fixing device whose design is compact, it 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)
  • Electric Clocks (AREA)
  • Adornments (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
EP21212693.2A 2021-12-07 2021-12-07 Vorrichtung zur befestigung eines bodens auf einem gehäuserahmen einer uhr Pending EP4194967A1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP21212693.2A EP4194967A1 (de) 2021-12-07 2021-12-07 Vorrichtung zur befestigung eines bodens auf einem gehäuserahmen einer uhr
US17/952,689 US20230176525A1 (en) 2021-12-07 2022-09-26 Device for fastening a back on a middle for a timepiece
JP2022160023A JP7465932B2 (ja) 2021-12-07 2022-10-04 計時器のための胴に裏蓋を締結するデバイス
CN202211332421.5A CN116243582A (zh) 2021-12-07 2022-10-28 用于将后盖紧固在钟表的中间件上的装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21212693.2A EP4194967A1 (de) 2021-12-07 2021-12-07 Vorrichtung zur befestigung eines bodens auf einem gehäuserahmen einer uhr

Publications (1)

Publication Number Publication Date
EP4194967A1 true EP4194967A1 (de) 2023-06-14

Family

ID=78822666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21212693.2A Pending EP4194967A1 (de) 2021-12-07 2021-12-07 Vorrichtung zur befestigung eines bodens auf einem gehäuserahmen einer uhr

Country Status (4)

Country Link
US (1) US20230176525A1 (de)
EP (1) EP4194967A1 (de)
JP (1) JP7465932B2 (de)
CN (1) CN116243582A (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2874022A1 (de) * 2013-11-15 2015-05-20 Chopard Technologies SA Armbanduhrengehäuse, das eine Bajonettverbindung umfasst
EP3062171A1 (de) * 2015-02-27 2016-08-31 ETA SA Manufacture Horlogère Suisse Armbanduhrgehäuse aus plastik oder galvanoplastisch erzeugtem material mit abnehmbarem uhrenglas
EP3680729A1 (de) * 2019-01-09 2020-07-15 Blancpain SA Ausrichtbarer boden für eine uhr
EP3796104A1 (de) * 2019-09-20 2021-03-24 The Swatch Group Research and Development Ltd Untereinheit zur verkleidung einer uhr, armbanduhr oder eines schmuckstücks

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5580776B2 (ja) 2011-04-14 2014-08-27 日本電信電話株式会社 無線通信システム、及び無線通信方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2874022A1 (de) * 2013-11-15 2015-05-20 Chopard Technologies SA Armbanduhrengehäuse, das eine Bajonettverbindung umfasst
EP3062171A1 (de) * 2015-02-27 2016-08-31 ETA SA Manufacture Horlogère Suisse Armbanduhrgehäuse aus plastik oder galvanoplastisch erzeugtem material mit abnehmbarem uhrenglas
EP3680729A1 (de) * 2019-01-09 2020-07-15 Blancpain SA Ausrichtbarer boden für eine uhr
EP3796104A1 (de) * 2019-09-20 2021-03-24 The Swatch Group Research and Development Ltd Untereinheit zur verkleidung einer uhr, armbanduhr oder eines schmuckstücks

Also Published As

Publication number Publication date
CN116243582A (zh) 2023-06-09
JP7465932B2 (ja) 2024-04-11
JP2023084661A (ja) 2023-06-19
US20230176525A1 (en) 2023-06-08

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