US3488943A - Latching device for the dial on a watch movement - Google Patents

Latching device for the dial on a watch movement Download PDF

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Publication number
US3488943A
US3488943A US783921A US3488943DA US3488943A US 3488943 A US3488943 A US 3488943A US 783921 A US783921 A US 783921A US 3488943D A US3488943D A US 3488943DA US 3488943 A US3488943 A US 3488943A
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US
United States
Prior art keywords
dial
latch
latch member
movement
edge
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.)
Expired - Lifetime
Application number
US783921A
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English (en)
Inventor
Urs Giger
Heinrich Stamm
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.)
ETA AG
Ebauchesfabrik ETA AG
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Ebauchesfabrik ETA AG
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Publication date
Application filed by Ebauchesfabrik ETA AG filed Critical Ebauchesfabrik ETA AG
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Publication of US3488943A publication Critical patent/US3488943A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D1/00—Gripping, holding, or supporting devices
    • G04D1/0007—Gripping, holding, or supporting devices for assembly entirely by hand
    • G04D1/0021—Supporting means facilitating assembly and mechanisation, e.g. magazines for components
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/06—Dials
    • G04B19/14—Fastening the dials to the clock or watch plates
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/0002—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe
    • G04D3/0043—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms
    • G04D3/0048—Watchmakers' or watch-repairers' machines or tools for working materials for mechanical working other than with a lathe for components of the time-indicating mechanisms for dials

Definitions

  • the latching devices contemplated here are still more particularly of the type comprising a latch member for each dial foot, each latch member being mounted in the watch movement so as to be movable from a resting position into a working position and vice versa, each latch member further comprising a sharp edge which, in order to hold the dial in place, cooperates with a notch formed by said sharp edge in the corresponding dial foot the first time said latch member is brought in its working position after the dial has been set in place on the movement.
  • each latch member comprises a resilient split pivot fitting a bore of the base plate of the movement, said bore extending in parallel with the corresponding dial foot and being located in the vicinity of the latter.
  • Each latch of the known devices moreover comprises an abutting surface lying on the base plate, said abutting surface being formed on a thicker latch portion, the contour of which has the shape of a spiral, this thicker portion being further bevelled so as to form a sharp cutting edge thereon.
  • Each latch of the known devices finally comprises a head portion extending above said thicker portion and being slotted as a screw head. This slotted head enables actuating the latches of the known devices by means of a conventional screw driver.
  • the known latching devices have however two important drawbacks.
  • the first drawback of these known latching devices resides in the fact that their working position is not determined. If the dial has to be removed from the watch movement for any reason, it may occur, when it is set in place again, that the latches will be moved the second time beyond the position which they reached the first time, their sharp edges consequently cutting deeper notches in the dial feet. If the same operation has to be repeated sometimes, it may occur that the sharp edges of the latches either cut the dial feet throughout or permit the latches to be rotated without reaching a working position in which they would be locked in a precise angular position.
  • the second drawback of the known latching devices resides in the rather uneasy mode of actuation of the latch members. After the dial has been set in place on the watch movement, the latter has to be turned up for actuating the latch members. During that motion either one of the dial feet can move relative to the watch movement so that after having actuated the latch members, the dial does not correctly lie on the movement.
  • latching devices There are actually latching devices known in the art by means of which the abovementioned drawbacks can be removed. Instead of latch members extending in parallel with the dial feet, these known latching devices comprise latch members which are perpendicular to the dial feet, said latch members consisting of screws inserted in bores provided in the side face of the watch movement base plate.
  • each latch member is formed with an actuating portion accessible from outside the movement and moving substantially along a radial line thereof inwards when the latch member moves itself from its resting position toward its working position, these latch members thus simply requiring a mere pushing action exerted on their actuating portion for causing the latch member to move from its resting position into its working position.
  • each latch member has only to be arranged, on the one hand, so as to protrude laterally from the movement when the latch member is in its resting position, and, on the other hand, so as to be flush with the side face of the movement when said latch member is in its working position.
  • each latch member can be brought in working position by merely pushing the same by means of a rod substan tially extending along a radial line of the watch movement and having a cross-section substantially exceeding that of the actuating portion of the latch members.
  • a rod substan tially extending along a radial line of the watch movement and having a cross-section substantially exceeding that of the actuating portion of the latch members.
  • a still further particular object of the invention consists in using a latch member comprising, on the one hand, a rigid body portion cooperating with corresponding guiding means provided on the watch movement and, on the other hand, a resilient arm connected to said rigid body portion, the sharp edge of the latch member being provided on said resilient arm and extending along the same.
  • FIG. 1 is a plan view of the first embodiment, the latch member being in its resting position
  • FIG. 2 is a similar plan view of the same embodiment, the latch member being in its working position;
  • FIG. 3 is a cross-section along line III-III of FIG. 2, and
  • FIG. 4 is a plan view similar to FIG. 2 showing the second embodiment.
  • This bore extends under the bevelled outer part 4 of the balance cock 5, a part of which has been broken away in the drawing.
  • the surface of base plate 3, which is directed toward cock 5, is provided with a recess 6 having the shape of the upper portion of a heart.
  • a groove 7 is moreover cut in the side wall of the right auricle of recess 6 in the ground portion of said side wall. Groove 7 intersects bore 2 of the dial foot 1.
  • a stud 8 and a stop 9 protrude from the bottom of recess 6.
  • a latch 10 provided for cooperation with foot 1 is mounted on pivot 8 so as to be rockable thereabout. A cut-out corresponding to pivot 8 is therefore provided in a rigid portion 10a of latch 10.
  • Latch 10 moreover comprises an arm 10b which is yieldably connected to body portion 10a by means of an arcuate lever portion 10c.
  • the edge 12 of arm 10b, which is opposed to stud 8, is bevelled so as to form a sharp cutting edge 13.
  • this cutting edge has the shape of an arc of a circle, the center of which is however off-set with respect to stud 8 so that the outer end of edge 13 will be farther away from stud 8 than the inner end of edge 13.
  • Arm 10b of the latch member partly extends within groove 7 which thus holds the latch member on the bottom of recess 6.
  • the width of groove 7 corresponds to the thickness of latch member 10.
  • latch member 10 When this latch member 10 is in its resting position represented in FIG. 1, it lies against stop 9. In that position bore 2 is free so that foot 1 of the dial can be introduced therein without any ditficulty.
  • the outer end of arm 10b protrudes laterally from base plate 3 of the watch movement. Since latch 10 is snugly fitted on stud 8, it remains in its resting position even if the watch movement is turned over for setting the dial 18 (FIG. 3) in place.
  • the dial 18 Once the dial 18 has been set on the watch movement in such manner that its feet extend within the corresponding movement bores and stand in the desired axial position, it can be locked in place by merely pushing the latch members 10 by means of a rod 14 (FIG. 2) until this rod 14 butts against the side edge of base plate 3.
  • latch 10 Upon moving further on the latch 10 causes its sharp edge 13 to cut a notch in foot 1. The more latch 10 is pushed into the movement, the deeper edge 13 cuts in foot 1, because of the excentricity of edge 13. Since this edge 13 is provided on a resilient arm of the latch memher, it stops however cutting the dial foot before the latch 10 has reached its working position, namely when the resistance of foot 1 balances the bending resistance of the arcuate lever portion of the latch. During the last phase of the displacement of latch 10' its edge 13 merely slides in the notch which has just been provided in foot 1, thus causing a progressive bending of the arcuate lever portion 100 of the latch. In the working position represented in FIG. 2 latch 10 is accordingly not only locked by the frictional engagement of latch 10 on stud 8, but also by the frictional engagement produced by the arcuate lever portion 100 between edge 13 and the dial foot.
  • Recess 6 is substantially covered by the outer edge 4 of balance cock 5.
  • a small lunulate cut-out 15 provided in the balance cock provides for a free access to latch 10 thus enabling unlatching foot 1 and removing dial 18.
  • the latch member comprises a projection 16 provided at the outer end of its arm 10b so that it may be caught by means of the end 17 of a screw driver extending through cut-out 15 of the balance cock thereby enabling latch 10 to be removed from its working position and to be restored in its resting position represented in FIG. 1.
  • the screw driver 17 can rest on stop 9 as indicated in FIG. 2.
  • a second latch identical to that described is provided at the appropriate place of base plate 3.
  • the recess which has to be provided in that base plate for the second latch can be covered, according to the arrangement of the bridges on the base plate, by the outer edge either of a wheel bridge or of the barrel bridge in the same manner as recess 6 is covered by the outer edge of the balance cock.
  • the disclosed latching device obviously enables setting dial 18 on the watch movement and fixing the same thereon by automatic means.
  • rod 14 belongs to such an automatic device, adjusting the same does not raise any difficulty.
  • the cross-section of rod 14 is substantially larger than that of arm 10b of the latch member so that rod 14 need only be coarsely alined with that arm of the latch member.
  • the stroke of rod 14 is automatically limited by the edge of base plate 3, because in the working position of latch 10, the outer end of arm 10b is flush with the base plate edge as shown in FIG. 2.
  • the sizes of recess 6 as well as of groove 7 are chosen in such manner that the latch 10 can be pushed into the movement beyond the position represented in FIG. 2 thus bending the arcuate lever portion 10 of the latch even more and setting the latter in a position which it will not leave incidentally.
  • the latch member associated with dial foot 1 is no longer arranged as a rocking lever, but as a slide.
  • an elongated radial recess 19 is provided in base plate 3.
  • Grooves 19a, 19b are provided in the parallel side walls of this recess in the ground portions thereof, the width of these grooves corresponding to the thickness of slide 20.
  • Slide 20 comprises a rigid body portion 201; which partly extends within groove 19a serving as guiding means for the slide.
  • An arm 20b yieldably connected to the rigid body portion 20a is provided with a sharp edge 21 as in the first embodiment.
  • the shape of edge 21 is chosen so that it cooperates with foot 1 in the same manner as edge 13 in the first embodiment, when slide 20 is pushed inwards.
  • a pin 22 projecting from the bottom of recess 19 prevents slide 20 from falling out of the movement and serves at the same time as a stop for determining the position of rest of slide 20.
  • slide 20 can be pulled from its working position represented in FIG. 4 and moved in its position of rest by means of a screw driver 17 as in the first embodiment.
  • a lunulate cut-out 23 is provided in the bevelled outer edge 4 of the balance cock 5 which covers recess 19.
  • the second dial foot (not shown) can be locked in the corresponding base plate bore by means of a second slide identical to the first one.
  • the two slides of the second embodiment can obviously be actuated under the same conditions as the rocking levers of the first embodiment.
  • a latching device comprising, for each dial foot, a latch member mounted in the watch movement so as to be movable from a resting position into a working position and vice versa, said latch member comprising a sharp edge and being formed with an actuating portion accessible from outside the movement and moving substantially along a radial line of the movement inwards when said latch member moves itself from its resting position toward its working position, each dial foot being provided with a notch formed by said sharp edge of the corresponding latch member the first time said latch member is brought in its working position after the dial has been set in place on the movement, said sharp edge and said notch of each corresponding pair of latch member and dial foot cooperating with each other and locking said dial on said movement when the latch members associated with the dial feet are in their working positions.
  • each latch member protrudes laterally from the movement when the latch member is in its resting position and is flush with the side face of the movement when said latch member is in its working position.
  • each latch member comprising a rigid body portion cooperating with the corresponding guiding means and a resilient arm connected to said rigid body portion, said sharp edge being provided on said resilient arm and extending along the same.
  • each latch member is arranged as a lever whereby its rigid body portion is pivotally mounted on a fixed stud constituting said guiding means, and its resilient arm, constituting said actuating portion, is connected to said rigid body portion by means of an arcuate lever portion.
  • each latch member is arranged as a split slide having one leg constituting said rigid body portion and being inserted in a groove provided on the base plate of the watch movement and constituting said guiding means, while the other leg is resilient and carries said sharp edge.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Buckles (AREA)
  • Knives (AREA)
US783921A 1967-12-19 1968-12-16 Latching device for the dial on a watch movement Expired - Lifetime US3488943A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1775367A CH502628A (de) 1967-12-19 1967-12-19 Vorrichtung zur Verriegelung von in Uhrwerkbohrungen eingesetzten Zifferblattfüsschen

Publications (1)

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US3488943A true US3488943A (en) 1970-01-13

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ID=4427831

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Application Number Title Priority Date Filing Date
US783921A Expired - Lifetime US3488943A (en) 1967-12-19 1968-12-16 Latching device for the dial on a watch movement

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US (1) US3488943A (enrdf_load_stackoverflow)
CH (2) CH1775367A4 (enrdf_load_stackoverflow)
FR (1) FR1590827A (enrdf_load_stackoverflow)
GB (1) GB1241230A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731482A (en) * 1970-11-26 1973-05-08 Schild Sa A Device for fastening a dial to a watch movement
US20120124814A1 (en) * 2010-11-23 2012-05-24 Eta Sa Manufacture Horlogere Method and device for securing a display element
US20200301368A1 (en) * 2019-03-18 2020-09-24 Montres Jaquet Droz Sa Timepiece dial provided with a three-dimensional decoration
JP2021076599A (ja) * 2019-11-05 2021-05-20 ブランパン・エス アー 文字盤を固定かつ／または取り外すシステム

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4312086A1 (fr) 2022-07-28 2024-01-31 Rolex Sa Cadran pour pièce d'horlogerie
CH720870A1 (fr) * 2023-06-19 2024-12-30 Patek Philippe Sa Geneve Ensemble formé d'un premier composant horloger assemblé à un second composant horloger

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US523913A (en) * 1894-01-31 1894-07-31 Fastening for watch-dials
US598523A (en) * 1897-02-04 1898-02-08 Watch-dial fastener
US613556A (en) * 1897-06-12 1898-11-01 Watch-dial fastener
CH53806A (fr) * 1911-11-23 1912-04-01 Leon Levy & Freres Sa Dispositif de fixation du cadran sur la platine d'un mouvement de montre
US1074130A (en) * 1912-07-02 1913-09-30 William B Miller Dial-fastening device for watches.
CH82809A (fr) * 1919-04-24 1919-10-16 Ltd H Williamson Dispositif de fixation d'un cadran à pieds à une platine d'un mouvement de montre, d'un compteur etc.
CH120846A (fr) * 1926-08-30 1927-06-01 Bovet Freres & Co S A Dispositif de fixation d'un cadran de montre sur la platine d'un mouvement de montre.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US523913A (en) * 1894-01-31 1894-07-31 Fastening for watch-dials
US598523A (en) * 1897-02-04 1898-02-08 Watch-dial fastener
US613556A (en) * 1897-06-12 1898-11-01 Watch-dial fastener
CH53806A (fr) * 1911-11-23 1912-04-01 Leon Levy & Freres Sa Dispositif de fixation du cadran sur la platine d'un mouvement de montre
US1074130A (en) * 1912-07-02 1913-09-30 William B Miller Dial-fastening device for watches.
CH82809A (fr) * 1919-04-24 1919-10-16 Ltd H Williamson Dispositif de fixation d'un cadran à pieds à une platine d'un mouvement de montre, d'un compteur etc.
CH120846A (fr) * 1926-08-30 1927-06-01 Bovet Freres & Co S A Dispositif de fixation d'un cadran de montre sur la platine d'un mouvement de montre.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731482A (en) * 1970-11-26 1973-05-08 Schild Sa A Device for fastening a dial to a watch movement
US20120124814A1 (en) * 2010-11-23 2012-05-24 Eta Sa Manufacture Horlogere Method and device for securing a display element
US8763252B2 (en) * 2010-11-23 2014-07-01 Eta Sa Manufacture Horlogère Suisse Method and device for securing a display element
US20200301368A1 (en) * 2019-03-18 2020-09-24 Montres Jaquet Droz Sa Timepiece dial provided with a three-dimensional decoration
US11644796B2 (en) * 2019-03-18 2023-05-09 Montres Jaquet Droz Sa Timepiece dial provided with a three-dimensional decoration
JP2021076599A (ja) * 2019-11-05 2021-05-20 ブランパン・エス アー 文字盤を固定かつ／または取り外すシステム
JP7041227B2 (ja) 2019-11-05 2022-03-23 ブランパン・エス アー 文字盤を固定かつ／または取り外すシステム

Also Published As

Publication number Publication date
FR1590827A (enrdf_load_stackoverflow) 1970-04-20
DE1814712A1 (de) 1969-07-10
CH502628A (de) 1970-08-31
DE1814712B2 (de) 1972-10-05
CH1775367A4 (enrdf_load_stackoverflow) 1970-08-31
GB1241230A (en) 1971-08-04

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