Patent US3693503A successfully refreshed from Google Patents.
US3693503A
Expired / Lapsed
US
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Hydrostatic transmission control with hydraulic follow-up
Assignee: International Motors LLC
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Filing: 1970-12-14
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Granted: 1972-09-26
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Expires: 1990-12-14
Abstract
Abstract A hydraulic follow-up for use with a hydraulic system placed between a rotating input member and a rotating output member. The hydraulic system is a hydrostatic transmission for driving a tractor, and comprises a hydrostatic pump and a hydrostatic motor driven by the pump. When the hydrostatic pump is angularly shifted with respect to the input member, the shifting is controlled by the hydraulic follow-up, which also shifts the motor in relation to the output member.
Inventors
- 👤 Charles A L Ruhl
- 👤 Edward Meyer
- 👤 Probir K Chatterjea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:23
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/42; B; B62; B62D; B62D11/00; B62D11/02; B62D11/06; B62D11/10; B62D11/14; B62D11/18; B62D11/183; F16H61/423; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
Servo mechanism with hydraulic follow-up comprising: a follower valve having a source of high and low pressure; hydraulic mechanism connected thereto, causing the valve to take a position corresponding to the angular position of said mechanism and to provide an actual-speed output at a pressure between high and low corresponding to said position; a second valve (19) having a source of high (26) and low pressure; manual mechanism (18) connected to the second valve, causing said valve to take a position corresponding to the angular position of the manual mechanism and to provide a desired-speed output at a pressure between high and low corresponding to the just said position; and comparator means (31 or 80) connected in the outputs of said valves effective to control the positions of the hydraulic mechanism and follower valve to a point at which the outputs reach an actual-speed desired-speed pressure balance indicative of correspondence in Angular position between the manual mechanism and the hydraulic mechanism.
Claim 2
Dependent Claim
161 words
Servo mechanism with hydraulic follow-up comprising: a follower valve having a source of high and low pressure; hydraulic mechanism connected thereto, causing the valve to take a position corresponding to the angular position of said mechanism and to provide an actual-speed output at a pressure between high and low corresponding to said position; a second valve (19) having a source of high (26) and low pressure; manual mechanism (18) connected to the second valve, causing said valve to take a position corresponding to the angular position of the manual mechanism and to provide a desired-speed output at a pressure between high and low corresponding to the just said position; and comparator means (31 or 80) connected in the outputs of said valves effective to control the positions of the hydraulic mechanism and follower valve to a point at which the outputs reach an actual-speed desired-speed pressure balance indicative of correspondence in Angular position between the manual mechanism and the hydraulic mechanism.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |