US3851540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perpendicularly meshing spur gearing
Assignee: Citizen Watch Co Ltd
•
Filing: 1973-06-22
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Granted: 1974-12-03
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Expires: 1993-06-22
Abstract
Abstract The perpendicularly meshing spur gearing is especially adapted for use between the winding pinion and the crown wheel of a timepiece and is characterized by a single projecting in the addendum of each tooth and an undercut on the same side of the tooth in the dedendum of each tooth. The projections are in the plane of each gear and are maintained in engagement during the whole engaging period of the related gear tooth.
Inventors
- 👤 H Tutiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:45
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/02; F16H55/08; F16H55/0846; G; G04; G04B; G04B13/00; G04B13/02; G04B13/027; G04B27/00; G04B27/02; G04B27/04; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/1987; Y10T74/19884; Y10T74/19949; Y10T74/19963; Y10T74/19972
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A transmission gearing comprising two mutually perpendicularly engaging spur gears, each tooth of at least one gear of said gearing having a rounded and locally projecting motion-transmitting projection positioned in its pseudoaddendum range within the tooth width of the Mating gear during meshing and directed towards its mating gear, each of said projections being kept in contact with the related tooth of the mating gear substantially during the whole engaging period of the related gear teeth.
Claim 2
Dependent Claim
76 words
A transmission gearing comprising two mutually perpendicularly engaging spur gears, each tooth of at least one gear of said gearing having a rounded and locally projecting motion-transmitting projection positioned in its pseudoaddendum range within the tooth width of the Mating gear during meshing and directed towards its mating gear, each of said projections being kept in contact with the related tooth of the mating gear substantially during the whole engaging period of the related gear teeth.
Claim 3
Dependent Claim
36 words
The transmission gearing of claim 1, wherein said tooth is formed with an undercut beginning from the root portion of said projection and extending through the pseudodedendum range of the gear tooth to the root circle.
Claim 4
Dependent Claim
35 words
The transmission gearing of claim 2 wherein the teeth on the mating gear having a configuration identical to the teeth on the other gear with the projections of related teeth engaging each other during meshing.
References Cited (Backward Citations)
US2436231A
Cited
US3701287A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |