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US3882669A Expired / Lapsed US ⏱️ 0.0 years remaining

Device for driving day and date indicators in a wrist-watch

Assignee: Ebauchesfabrik ETA AG
•
Filing: 1974-05-29
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Granted: 1975-05-13
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Expires: 1994-05-29
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Abstract

Abstract A watch having a driving device for a day indicator and for a date indicator, which device comprises a calenderwheel for rotating at a rate of one revolution every 24 hours, a cam and a shifting member rigidly coupled to one another and rotatively supported coaxially to the calendar-wheel, a pin integral with the cam and engaging an elongated and arcuate aperture of the calender-wheel for coupling the wheel and the cam in such a way that the cam and the shifting member are able to rotate freely through a certain angle with respect to the wheel, a control member cooperating with a spring and with the cam, so as to brought progressively into a shifting position and then for shifting the cam abruptly, the shifting member having a shifting element which describes during the shift a path passing beyond the point of rotation of the cam, a banking element which strikes against a concentric portion of the cam at the conclusion of the shift, and the shifting member further comprises a drive element for the date indicator and at least one drive element for the day indicator.

Inventors

  • 👤 Edwin Jakob

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 14:25
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: 7
Claim 1
Independent Claim 172 words
A watch including day and date indicators, and a device for driving the day and date indicators, comprising a calendar-wheel for rotating at the rate of one revolution every 24 hours, a cam coupled to the calendar-wheel in such a way as to be able to rotate freely with respect to the said wheel through a certain angle, and a control member cooperating with an incline of said cam for causing the cam to shift by rotating abruptly through said angle, wherein the control member comprises a shifting element which cooperates with the incline of the cam, and a banking element separate from said shifting element, the shifting element describing during the shift a path passing beyond the point of rotation of the cam, while the banking element strikes against a concentric portion of the cam at the conclusion of the shift, and a shifting member which is coupled rigidly to the cam and has a drive element for the date indicator and at least one drive element for the day indicator.
Claim 2
Dependent Claim 172 words
A watch including day and date indicators, and a device for driving the day and date indicators, comprising a calendar-wheel for rotating at the rate of one revolution every 24 hours, a cam coupled to the calendar-wheel in such a way as to be able to rotate freely with respect to the said wheel through a certain angle, and a control member cooperating with an incline of said cam for causing the cam to shift by rotating abruptly through said angle, wherein the control member comprises a shifting element which cooperates with the incline of the cam, and a banking element separate from said shifting element, the shifting element describing during the shift a path passing beyond the point of rotation of the cam, while the banking element strikes against a concentric portion of the cam at the conclusion of the shift, and a shifting member which is coupled rigidly to the cam and has a drive element for the date indicator and at least one drive element for the day indicator.
Claim 3
Dependent Claim 61 words
A watch in accordance with claim 1, wherein the day indicator comprises seven teeth or a multiple of that number, and wherein the shifting member comprises a number of drive elements dependent upon the number of teeth of the day indicator, said drive elements taken together for causing the day indicator to advance by one-seventh of a revolution at each shift.
Claim 4
Dependent Claim 19 words
A watch in accordance with claim 1, wherein the control member is a lever acted upon by a spring.
Claim 5
Dependent Claim 24 words
A watch in accordance with claim 3 wherein the banking element consists of an arcuately blanked portion of the edge of the said lever.
Claim 6
Dependent Claim 40 words
A watch in accordance with claim 4, wherein the said banking element extends between the shifting element and a convex end of the said lever, and wherein the said convex end cooperates with a radially oriented portion of the cam.
Claim 7
Dependent Claim 40 words
A watch in accordance with claim 5, wherein the said radially oriented portion of the cam and said convex end are blanked as segments of an involute, and roll upon one another when the cam is actuated by the calendar-wheel.

References Cited (Backward Citations)

US3451211A Cited
US3818692A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-05-12 1978-11-11 1979-05-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-05-12 1982-11-11 1983-05-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-05-12 1986-11-11 1987-05-13 $7700.00 Window Closed / Lapsed

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