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US3979971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential drive
Assignee: Sensus Spectrum LLC
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Filing: 1975-03-03
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Granted: 1976-09-14
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Expires: 1995-03-03
Abstract
Abstract A differential drive in which a reference sprocket is stationary for power drive and rotated for manual drive. In power drive, planet sprockets are orbited around the reference sprocket and rotated thereby. Drive planet sprockets on the same shafts drive an output sprocket at a slightly different ratio from the reference drive as they orbid around it, whereby there is a slow net rotation imparted thereto. In manual drive, the planet shaft axes are fixed and the reference wheel is rotated to drive the planet sprockets and rotate the output sprocket.
Inventors
- 👤 William A. Generke
- 👤 Hugh W. O'Connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:44
CPC Classifications
F; F16; F16H; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0806; F16H37/0826; F16K; F16K31/00; F16K31/44; F16K31/53; F16H7/00; F16H7/06; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18624
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
A differential drive comprising: a rotary input member rotatable about an axis; a planetary shaft on said input member displaced from and parallel to said axis; first and second planetary wheels rotatable together on said shaft; first and second complementary wheels on said axis; first and second motion transmitting means between said first planetary and complementary wheels and between said second planetary and complementary wheels, respectively; said second complementary wheel being adapted to deliver a rotary output; the rotary drive ratio between said first planetary and complementary wheels being nearly equal to but slightly different than that between said second planetary and complementary wheels; first drive means for rotating said input member; means locking said first drive means when not in operation; and second drive means for rotating said first complementary wheel comprising: a worm gear fixed to said first complementary wheel; and a worm rotatably carried in stationary bearings to lock said worm gear when idle.
Claim 2
Dependent Claim
157 words
A differential drive comprising: a rotary input member rotatable about an axis; a planetary shaft on said input member displaced from and parallel to said axis; first and second planetary wheels rotatable together on said shaft; first and second complementary wheels on said axis; first and second motion transmitting means between said first planetary and complementary wheels and between said second planetary and complementary wheels, respectively; said second complementary wheel being adapted to deliver a rotary output; the rotary drive ratio between said first planetary and complementary wheels being nearly equal to but slightly different than that between said second planetary and complementary wheels; first drive means for rotating said input member; means locking said first drive means when not in operation; and second drive means for rotating said first complementary wheel comprising: a worm gear fixed to said first complementary wheel; and a worm rotatably carried in stationary bearings to lock said worm gear when idle.
Claim 3
Dependent Claim
15 words
The differential drive defined by claim 1 including: manually operable means for rotating said worm.
Claim 4
Dependent Claim
17 words
The differential drive defined by claim 1 including: a selectively operated brake in said first drive means.
Claim 5
Dependent Claim
24 words
The differential drive defined by claim 1 wherein: at least one of said first and second motion transmitting comprises a chain and sprocket connection.
Claim 6
Dependent Claim
26 words
The differential drive defined by claim 1 including: an output member rotatable on said axis; and means coupling said output member to said second complementary wheel.
Claim 7
Dependent Claim
56 words
The differential drive defined by claim 1 including: a second shaft on said input member displaced from and parallel to said axis; a pair of planetary wheels on said second shaft; motion transmitting means between said planetary wheels and said complementary wheels; and said shafts being spaced equally from said axis on a common pitch diameter.
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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |