US3789691A - Frictional coupling device for watch movement - Google Patents

Frictional coupling device for watch movement Download PDF

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Publication number
US3789691A
US3789691A US00271131A US3789691DA US3789691A US 3789691 A US3789691 A US 3789691A US 00271131 A US00271131 A US 00271131A US 3789691D A US3789691D A US 3789691DA US 3789691 A US3789691 A US 3789691A
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US
United States
Prior art keywords
arbor
pinion
connecting member
gripping elements
groove
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
US00271131A
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English (en)
Inventor
R Zaugg
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.)
A Schild SA
Original Assignee
A Schild 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 A Schild SA filed Critical A Schild SA
Application granted granted Critical
Publication of US3789691A publication Critical patent/US3789691A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/001—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power
    • G04B11/003—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power with friction member, e.g. with 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
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/02—Devices allowing the motion of a rotatable part in only one direction
    • G04B11/022—Devices allowing the motion of a rotatable part in only one direction with a ratchet which makes contact with the rotating member by means of teeth
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19851—Gear and rotary bodies
    • Y10T74/19856—Laterally-spaced wheels

Definitions

  • the object of the present invention is a frictional coupling device located between two rotational and coaxial components of a watch movement.
  • Frictional couplings of this kind are found in conventional watch movements between the cannon-pinion supporting the minute hand and the arbor of the center wheel and pinion which pivots at the center of the bottom plate between the latter and the train-bar.
  • the cannon-pinion is provided with a long bushing which is reamed with respect to the end of the arbor of the cen-. ter wheel-and-pinion, this end extending beyond the outer side of the bottom plate.
  • This part of the arbor is provided with a groove or slot and coupling is achieved by tightening the bushing of the cannon-pinion against the arbor at two locations that are diametrically opposite.
  • Frictional coupling devices of small size in the axial direction are already known, which comprise an elastic wire or thread folded into a triangle and on one hand pressing against the arbor and on the other against the hub coupled to that arbor.
  • Such executions or embodiments sometimes are meant for horology components or pieces of average dimensions such as alarm clocks or alarms. They do not provide sufficient reliability for use in watch movements, particularly not in watch movements with eccentric center wheel-and-pinions.
  • the purpose of the present invention is to create a frictional coupling capable of reliably driving the cannon-pinion by means of the arbor of the center wheeland-pinion, for movement with the eccentric center wheel-and-pinion.
  • the frictional device according to the invention will therefore offer high reliability without need for prior corrections and also will offer small size in the axial direction, while being simple, easy to manufacture and easy to assemble.
  • the device according to the invention is characterized as comprising a shaped, elastic component that grips or hooks onto one of said elements and that presses against a cylindrical surface of the other.
  • the attached drawing illustratively shows a mode of embodiment of the device according to the invention.
  • FIG. 1 is a view in axial section
  • FIG. 2 is a view of a section along line Il-II of FIG. 1.
  • the drawing shows an assembly with an eccentric center wheel 1, the arbor 2 which is made of one piece with a pinion 3 and supports the wheel of the center wheel-and-pinion 5 force-fitted against a shoulder 4.
  • Arbor 2 at both ends is provided with journals 6 passing through the perforated jewels 7, one jewel being forcefitted into an opening of bottom plate 8 and the other into a corresponding opening, and of the same axis, in train-bar 9.
  • the arbor of the center wheel-and-pinion 1 supports a cannon-pinion 10 between bottom plate 8 and pinion 3; this cannon-pinion may for instance be connected to a center pinion bearing the minute hand by means of a countershaft.
  • Cannon-pinion 10 comprises a hub extending in the axial sense on both sides of toothing 1 1. On one side this hub forms an annular rib 12 which is removed from arbor 2 because of a circular recess 13. On the other side, the hub 10 consists of two catches or holding parts 14 and 15 in the shape of diametrically opposite crown segments which are bounded by parallel flat sides 16 and 17.
  • cannon-pinion 10 is adapted to the diameter of arbor 2 so as to allow free rotation but without play between these two parts. Opposite catches l4 and 15, there is a circular groove 18 in arbor 2, the groove thus being in the immediate vicinity of upper journal or pivot 6.
  • the final element of the frictional coupling is a shaped, elastic component 19 consisting of a flat washer blanked for instance from a steel plate or sheet and with circular periphery and with a shaped central opening and radial slit.
  • the central opening and the slit in component 19 roughly assume the shape of a cross, so that the inner edges of said opening and slit define two projections of triangular shape, 20 and 21, located opposite the slit, and two larger projections 22 and 23 located on either side of the slit and of which the ends are blanked as concave tips 24 and 25 with smooth radii.
  • the dimensions of this elastic component are such that when the cannon-pinion l0 engaged arbor 2, the
  • the concave ends 24 and 25 of projections 22 and 23 may engage groove 18 while the aligned flanks of projections 20 and 21 grip the sides 16 of catches 14 and 15.
  • Axial connection between elements 1 and then is achieved on the one hand by rib 12 pushing against pinion 3 and on the other hand by projections 24 and 25 engaging into groove 18.
  • projections 24 and 25 rigidly connect the two rotating wheel-and-pinions by radially pressing against the inside of groove 18, as long as the couple being transmitted from one to the other does not exceed a given limiting value.
  • the described device in another embodiment, might be achieved between a conventional cannon-pinion provided with a bushing passing through the dial central opening on one hand, and the arbor of a center wheel-and-pinion located at the center of the movement.
  • the shape and the location of catches 14 and 15, also the shape of the elastic component connecting the two coupling elements may differ from those illustrated in the drawing.
  • the device described above offers multiple advantages. Firstly, it requires very little space in the axial direction.
  • blanking of disc 19, lathe-turning and milling of catches 14 and 15 and lathe-turning of arbor 2 may be carried out in mass-production with conventional machinery and are of such accuracy or precision that without corrections a coupling will be obtained having a well defined couple limit, constant and relatively strong.
  • a third advantage is that the assembly of the device is very simple. Because of the symmetry in the shape of catches 14 and 15, and similarly for the disc or washer 19, it is possible to position the latter without paying attention as to how it is being fed in, and therefore assembly operations are appreciably facilitated while at the same time many assembly errors are eliminated.
  • the described device remains insensitive to wear or remains unaffected by it. While of very small size, the disc or Washer 19 constitutes an elastic component with large capacity for deformation and ensures a fairly powerful driving couple without suffering permanent deformation.
  • a frictional coupling device for two rotating, coaxial components of a watch movement comprising an arbor, a pinion on that arbor which is freely engaged and which is provided with two gripping elements located on either side of the arbor, a groove in the arbor at the level of the gripping elements, and a connecting member that is elastically deformable and that presses against the groove in the arbor and against the gripping elements so as to be integral with the pinion when rotating and so as to exert a pressure on the arbor.
  • gripping elements are made up of two diametrically opposite catches projecting from the pinion in the axial direction and bounded laterally by two concentric cylindrical surfaces and by two parallel planes.
  • the connecting member is made up of an annular disc or washer with a slit and of which the inner periphery defines four projections, two of these being located on either side of the slit and pushing against the arbor while the other two are gripped by said gripping elements.
  • connecting member has two projections which press against the arbor in said groove and which interlock said connecting member with respect to the arbor in the axial direction.
  • a device wherein said pinion is kept between the connecting member and a shoulder or lip of the arbor.
  • the arbor pivots at its two ends between the bottom plate and a movement bar or bridge, wherein it is interlocked to a pinion and to a wheel and wherein it constitutes an eccentric center wheel-and-pinion, said first pinion being provided with gripping elements constituting the movements cannon-pinion.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Operated Clutches (AREA)
  • Gears, Cams (AREA)
US00271131A 1971-07-12 1972-07-12 Frictional coupling device for watch movement Expired - Lifetime US3789691A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1022571A CH544329A (fr) 1971-07-12 1971-07-12 Dispositif d'accouplement à friction pour mouvement de montre

Publications (1)

Publication Number Publication Date
US3789691A true US3789691A (en) 1974-02-05

Family

ID=4360803

Family Applications (1)

Application Number Title Priority Date Filing Date
US00271131A Expired - Lifetime US3789691A (en) 1971-07-12 1972-07-12 Frictional coupling device for watch movement

Country Status (4)

Country Link
US (1) US3789691A (de)
CH (2) CH544329A (de)
DE (1) DE2231692C3 (de)
FR (1) FR2145473B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459121A (en) * 1982-03-12 1984-07-10 The Garrett Corporation Torque limiting clutch
US4578047A (en) * 1982-11-16 1986-03-25 Thomson-Brandt Station-selecting device for a radio receiver
EP0836126A2 (de) * 1996-10-11 1998-04-15 Seiko Instruments Inc. Elekctronische Weckeruhr
CN106537262A (zh) * 2014-06-18 2017-03-22 Eta瑞士钟表制造股份有限公司 钟表轮副

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5820946Y2 (ja) * 1977-06-14 1983-05-02 セイコ−光機株式会社 時計のスリップ機構
EP3617811A1 (de) * 2018-09-03 2020-03-04 Rolex Sa Herstellungsverfahren einer reibung mittels rutschkupplung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3376714A (en) * 1966-02-28 1968-04-09 Gen Motors Corp Clutch assembly
US3406583A (en) * 1967-01-30 1968-10-22 Gen Motors Corp Drive mechanism having overload release means
US3648476A (en) * 1970-06-18 1972-03-14 Whirlpool Co Clutch for domestic ice maker with defrost timer drive motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3376714A (en) * 1966-02-28 1968-04-09 Gen Motors Corp Clutch assembly
US3406583A (en) * 1967-01-30 1968-10-22 Gen Motors Corp Drive mechanism having overload release means
US3648476A (en) * 1970-06-18 1972-03-14 Whirlpool Co Clutch for domestic ice maker with defrost timer drive motor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459121A (en) * 1982-03-12 1984-07-10 The Garrett Corporation Torque limiting clutch
US4578047A (en) * 1982-11-16 1986-03-25 Thomson-Brandt Station-selecting device for a radio receiver
EP0836126A2 (de) * 1996-10-11 1998-04-15 Seiko Instruments Inc. Elekctronische Weckeruhr
EP0836126A3 (de) * 1996-10-11 2000-12-27 Seiko Instruments Inc. Elekctronische Weckeruhr
CN106537262A (zh) * 2014-06-18 2017-03-22 Eta瑞士钟表制造股份有限公司 钟表轮副
US20170185040A1 (en) * 2014-06-18 2017-06-29 Eta Sa Manufacture Horlogere Suisse Timepiece wheel set
US10365608B2 (en) * 2014-06-18 2019-07-30 Eta Sa Manufacture Horlogere Suisse Timepiece wheel set

Also Published As

Publication number Publication date
FR2145473A1 (de) 1973-02-23
DE2231692A1 (de) 1973-01-18
FR2145473B1 (de) 1976-10-29
CH544329A (fr) 1973-05-30
DE2231692C3 (de) 1980-01-03
CH1022571A4 (de) 1973-05-30
DE2231692B2 (de) 1974-08-08

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