Patent US3710567A successfully refreshed from Google Patents.
US3710567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calendar watch with isolated hour hand changing means combined with synchronization gearing
Assignee: Omega Louis Brandt and Frere SA
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Filing: 1972-01-26
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Granted: 1973-01-16
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Expires: 1992-01-26
Abstract
Abstract A calendar watch showing the day of the month is combined with an hour hand changing device for changing the hour hand independently of the minute hand and includes a watch movement driving the hour hand, the minute hand and a day of the month indicator, the hour hand changing device being associated with the movement and including means for selectively by-passing a driving gear of the movement and driving the hour hand through an hour wheel which in turn drives a series of gears for operating the day of the month indicator so that the hour hand and the day of the month indicator remain synchronized to enable the indicator to change the day at midnight.
Inventors
- 👤 W Cleusix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:02
CPC Classifications
G; G04; G04B; G04B19/00; G04B19/24; G04B19/243; G04B19/247; G04B19/25; G04B19/22; G04B19/221; G04B27/00; G04B27/005
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
149 words
A calender watch showing the day of the month, comprising an hour hand, a minute hand, a day of the month indicator, a watch movement including a plurality of gears for driving said hour hand, said minute hand and said day of the month indicator, at least one of said gears constituting an hour wheel in driving relation with said hour hand, an hour hand changing device for changing the hour hand independently of said minute hand, said device comprising means for selectively by-passing a driving gear of said movement and driving said hour wheel to change said hour hand, said hour wheel driving a series of gears which drive said day of the month indicator so that the position of the hour hand and the day of month indicator remain synchronized to enable the movement driving the day of the month indicator to change the day at midnight.
Claim 2
Dependent Claim
149 words
A calender watch showing the day of the month, comprising an hour hand, a minute hand, a day of the month indicator, a watch movement including a plurality of gears for driving said hour hand, said minute hand and said day of the month indicator, at least one of said gears constituting an hour wheel in driving relation with said hour hand, an hour hand changing device for changing the hour hand independently of said minute hand, said device comprising means for selectively by-passing a driving gear of said movement and driving said hour wheel to change said hour hand, said hour wheel driving a series of gears which drive said day of the month indicator so that the position of the hour hand and the day of month indicator remain synchronized to enable the movement driving the day of the month indicator to change the day at midnight.
Claim 3
Dependent Claim
188 words
A calender watch as recited in claim 1 wherein said movement for driving said hour and minute hands comprises a center shaft and a drive pinion coaxial with and mounted on said center shaft, a minute pinion and shaft in driving relation with said hour wheel, a first minute wheel loosely mounted on said minute pinion and shaft and in driving relation with said drive pinion, a second minute wheel fixedly mounted on said minute pinion shaft coaxial with the first minute wheel, mechanical and magnetic coupling means between said first and second minute wheels, said magnetic coupling being of such strength as to drive the minute pinion during normal operation of said movement but insufficient to couple said minute wheels upon operation of said hour hand changing device for changing the hour hand independently of the minute hand, said mechanical coupling means comprising means for rotating the second minute wheel and overcoming the magnetic coupling while the first minute wheel remains engaged with the drive pinion, and additional hour hand changing means for simultaneous correction of the hour and minute hands wherein the mechanical coupling is activated.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |