US4308610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gear train for analog display timepiece
Assignee: Bulova Watch Co Inc
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Filing: 1979-12-03
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Granted: 1981-12-29
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Expires: 1999-12-03
Abstract
Abstract An electronic or mechanical timepiece of the analog display type provided with a gear train for driving timekeeping hands. The gear train includes a center pipe affixed to an intermediate bridge secured to the base plate, a free cannon pinion being rotatably supported on the pipe and having a center wheel mounted thereon which is disposed in the space between the bridge and a section of the base plate, thereby providing a dependable support for the cannon pinion without the need for enlarging the diameter of the center wheel or of the drive pinion intermeshing therewith.
Inventors
- 👤 Erich Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:39
CPC Classifications
G; G04; G04B; G04B13/00; G04B13/02; G04B19/00; G04B19/02; G04B29/00; G04B29/02; G04B33/00; G04B33/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
In an analog display timepiece whose timekeeping hands are driven by a gear train, the train comprising: A. a base plate having an intermediate bridge secured thereto spaced from a section of the plate to define a gear space; B. a center pipe normal to the base plate and affixed at one end to said bridge, said center pipe having a seconds hand shaft coaxially disposed therein; C. a free cannon pinion mounted on said center pipe; D. an hour wheel having a tubular extension concentric with said cannon pinion and rotatable thereon; and E. a center wheel disposed in said gear space and frictionally clamped on said cannon pinion, said cannon pinion being provided with toothing engaged by a minute wheel, the center wheel being provided with stop means extending radially beyond said toothing and cooperating with a counter stop formed on said section of the base plate.
Claim 2
Dependent Claim
149 words
In an analog display timepiece whose timekeeping hands are driven by a gear train, the train comprising: A. a base plate having an intermediate bridge secured thereto spaced from a section of the plate to define a gear space; B. a center pipe normal to the base plate and affixed at one end to said bridge, said center pipe having a seconds hand shaft coaxially disposed therein; C. a free cannon pinion mounted on said center pipe; D. an hour wheel having a tubular extension concentric with said cannon pinion and rotatable thereon; and E. a center wheel disposed in said gear space and frictionally clamped on said cannon pinion, said cannon pinion being provided with toothing engaged by a minute wheel, the center wheel being provided with stop means extending radially beyond said toothing and cooperating with a counter stop formed on said section of the base plate.
Claim 3
Dependent Claim
35 words
A gear train as set forth in claim 1, wherein said stop means is defined by a disc which is pressed on said cannon pinion, one face of said disc cooperating with said counter stop.
Claim 4
Dependent Claim
27 words
A gear train as set forth in claim 2, wherein said counter stop is defined by an arcuate shoulder formed on said section of the base plate.
Claim 5
Dependent Claim
53 words
A gear train as set forth in claim 3, further including a wheel having a drive pinion intermeshing with said center wheel and supported for rotation between the section of the base plate and a wheel bridge parallel to said intermediate bridge, said drive pinion passing through a bore in said intermediate bridge.
Claim 6
Dependent Claim
36 words
A gear train as set forth in claim 4, further including a seconds wheel mounted on said seconds hand shaft below said intermediate bridge, said seconds wheel having a pinion intermeshing with said drive pinion wheel.
Claim 7
Dependent Claim
37 words
A gear train as set forth in claim 5, wherein said free cannon pinion is provided with toothing which intermeshes with a minute wheel whose pinion intermeshes with an hour wheel rotatable on said free cannon pinion.
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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |