US3818692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive mechanism for two coaxial calendar members in watch movement
Assignee: A Schild SA
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Filing: 1973-09-24
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Granted: 1974-06-25
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Expires: 1993-09-24
Abstract
Abstract A drive mechanism for two coaxial calendar members meant to rotate in stepwise manner about their common axis in a watch movement, comprising a drive member provided with two fingerpieces for actuating one of each of the calendar members, a calendar wheel connected to the gear-train and coaxial with the drive member, a coupling with angular play between the calendar wheel and the drive member, a cam rigidly connected to the drive member, a lever operating in concert with the cam, and a spring acting on the lever such that it will ensure an instantaneous jump of the two calendar members by rotation of the drive members after the latter has been brought into a given orientation by the calendar wheel. The invention is further characterized in that the contour of the cam is provided with a retaining notch operating in concert with the lever and limiting the rotation of the drive member under the influence of the spring.
Inventors
- 👤 A Bron
- 👤 R Zaugg
- 👤 K Schaller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:53
CPC Classifications
G; G04; G04B; G04B19/00; G04B19/24; G04B19/243; G04B19/247; G04B19/253; G04B19/25333; G04B19/25373; G04B19/25386
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
A drive mechanism for two coaxial calendar members which rotate stepwise about their common axis in a watch movement, comprising a drive member provided with two finger-pieces for actuating each of said calendar members; a calendar wheel coaxial with the drive member and connected to the gear train of said movement; coupling means with angular play coupling the calendar wheel and the drive member; a cam rigidly connected to the drive member; a lever coupled for operation in concert with the cam; and spring means acting on the lever to ensure an instantaneous jump of the two calendar members by rotation of the drive member when the drive member is brought into a given orientation by the calendar wheel, wherein the contour of the cam is provided with a retaining notch which with the lever engages for limiting the rotation of the drive member under the influence of said spring.
Claim 2
Dependent Claim
150 words
A drive mechanism for two coaxial calendar members which rotate stepwise about their common axis in a watch movement, comprising a drive member provided with two finger-pieces for actuating each of said calendar members; a calendar wheel coaxial with the drive member and connected to the gear train of said movement; coupling means with angular play coupling the calendar wheel and the drive member; a cam rigidly connected to the drive member; a lever coupled for operation in concert with the cam; and spring means acting on the lever to ensure an instantaneous jump of the two calendar members by rotation of the drive member when the drive member is brought into a given orientation by the calendar wheel, wherein the contour of the cam is provided with a retaining notch which with the lever engages for limiting the rotation of the drive member under the influence of said spring.
Claim 3
Dependent Claim
38 words
A mechanism as defined in claim 1, wherein the drive member and the calendar wheel are connected to each other by a coupling finger-piece fixed to the drive member and entering an arcuate slot in the calendar wheel.
Claim 4
Dependent Claim
30 words
A mechanism as defined in claim 1, further comprising an assembly plate on which the drive member and the lever are mounted and to which the spring is fixedly connected.
Claim 5
Dependent Claim
26 words
A mechanism as defined in claim 3, wherein said spring comprises an arm blanked from the assembly plate and bent perpendicularly to the plane of latter.
Claim 6
Dependent Claim
54 words
A mechanism as defined in claim 3, wherein the drive member loosely penetrates an aperture of the assembly plate, said driving member having a hub provided with a cylindrical housing placed upon a pivoting pin projecting from a bottom plate of the movement during the fastening of the assembly plate on the bottom plate.
Claim 7
Dependent Claim
34 words
A mechanism as defined in claim 1, wherein the retaining notch engages a boss of the lever, the lever being also provided with a beak portion which follows the remainder of the cam contour.
Claim 8
Dependent Claim
88 words
A mechanism as defined in claim 2, wherein the drive member and the calendar wheel are connected to each other by a coupling finger-piece fixed to the drive member and entering an arcuate slot in the calendar wheel and wherein the length of said arcuate slot of the calendar wheel Is such that at least one of said calendar members may move by one step about its axis when the drive member is blocked by the penetration of the lever boss into the retaining notch of the cam.
Claim 9
Dependent Claim
58 words
A mechanism as defined in claim 6, wherein the cam is provided with a spiral slope diverging from its axis starting at said retaining notch, with a descending slope nearing said axis starting at the outer end of the sprial slope, and with a third slope connecting the lower end of the descending slope to the retaining notch.
Claim 10
Dependent Claim
51 words
A mechanism as defined in claim 8, wherein said lever pivots about an axis and the distances from the lever pivoting axis to the beak on one hand, and to said boss on the other, are respectively larger and smaller than the distance between the pivoting axis of lever and cam.
Claim 11
Dependent Claim
35 words
A mechanism as defined in claim 9, wherein the cam and lever contours are such that the lever beak presses against the inner end of the descending slope when the boss penetrates the retaining notch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |