US3716983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calendar watch
Assignee: Citizen Watch Co Ltd
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Filing: 1971-06-22
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Granted: 1973-02-20
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Expires: 1991-06-22
Abstract
Abstract This invention relates to the feed mechanism of the above kind, by which a plurality of calendar teeth are automatically fed at every end of small or even months, so as to obviate otherwise troublesome manual calendar feed operation to be carried out at such every month end above referred to. The improvement resides in the provision of a small month end driver rotatably mounted on said date dial and adapted for performing a complete revolution per month together therewith said driver being controlled in its position by said cam and in close proximity of every month end.
Inventors
- 👤 K Tanaka
- 👤 A Tsuzuki
- 👤 T Matsumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:20
CPC Classifications
G; G04; G04B; G04B19/00; G04B19/24; G04B19/243; G04B19/247; G04B19/253; G04B19/25333; G04B19/25353; G04B19/2536
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
A calendar watch comprising a plate, a date calendar dial ring mounted on said plate and having thirty one successive date calendar display symbols and thirty one correspondingly arranged teeth, a month calendar dial ring rotatably mounted on said plate and comprising a month discriminator cam having at least twelve successive month calendar display symbols, said month calendar dial ring adapted to rotate a month step for a complete revolution of said date dial ring, said discriminator cam having different peripheral parts having different radial heights depending on the length of the calendar months, date feed means operatively connected with a conventional time-keeping and time indicating gear train engaging and advancing said date calendar dial a single tooth daily, a small month driver member pivotally mounted on said date dial and adapted to perform a complete revolution per month together therewith, and follower means operatively interposed between said driver and said cam for shifting said driver into operative engagement with said feed means at the end of the month for advancing said date calendar dial at least two teeth.
Claim 2
Dependent Claim
179 words
A calendar watch comprising a plate, a date calendar dial ring mounted on said plate and having thirty one successive date calendar display symbols and thirty one correspondingly arranged teeth, a month calendar dial ring rotatably mounted on said plate and comprising a month discriminator cam having at least twelve successive month calendar display symbols, said month calendar dial ring adapted to rotate a month step for a complete revolution of said date dial ring, said discriminator cam having different peripheral parts having different radial heights depending on the length of the calendar months, date feed means operatively connected with a conventional time-keeping and time indicating gear train engaging and advancing said date calendar dial a single tooth daily, a small month driver member pivotally mounted on said date dial and adapted to perform a complete revolution per month together therewith, and follower means operatively interposed between said driver and said cam for shifting said driver into operative engagement with said feed means at the end of the month for advancing said date calendar dial at least two teeth.
Claim 3
Dependent Claim
179 words
A calendar watch comprising a plate, a date calendar dial ring mounted on said plate and having thirty one successive date calendar display symbols and thirty one correspondingly arranged teeth, a month calendar dial ring rotatably mounted on said plate and comprising a month discriminator cam having at least twelve successive month calendar display symbols, said month calendar dial ring adapted to rotate a month step for a complete revolution of said date dial ring, said discriminator cam having different peripheral parts having different radial heights depending on the length of the calendar months, date feed means operatively connected with a conventional time-keeping and time indicating gear train engaging and advancing said date calendar dial a single tooth daily, a small month driver member pivotally mounted on said date dial and adapted to perform a complete revolution per month together therewith, and follower means operatively interposed between said driver and said cam for shifting said driver into operative engagement with said feed means at the end of the month for advancing said date calendar dial at least two teeth.
Claim 4
Dependent Claim
179 words
A calendar watch comprising a plate, a date calendar dial ring mounted on said plate and having thirty one successive date calendar display symbols and thirty one correspondingly arranged teeth, a month calendar dial ring rotatably mounted on said plate and comprising a month discriminator cam having at least twelve successive month calendar display symbols, said month calendar dial ring adapted to rotate a month step for a complete revolution of said date dial ring, said discriminator cam having different peripheral parts having different radial heights depending on the length of the calendar months, date feed means operatively connected with a conventional time-keeping and time indicating gear train engaging and advancing said date calendar dial a single tooth daily, a small month driver member pivotally mounted on said date dial and adapted to perform a complete revolution per month together therewith, and follower means operatively interposed between said driver and said cam for shifting said driver into operative engagement with said feed means at the end of the month for advancing said date calendar dial at least two teeth.
Claim 5
Dependent Claim
63 words
A calendar watch as set forth in claim 1 wherein said date feed means is comprises of a date feed pawl rotatable through a complete revolution per day for feeding said date dial ring by a single tooth and a small month end feed wheel rotatable with said pawl, said small month drive member having tooth means thereon for engagement with said wheel.
References Cited (Backward Citations)
US203640A
Cited
US563268A
Cited
US2286000A
Cited
US2483775A
Cited
US2709885A
Cited
US3373558A
Cited
FR1575397A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |