US3840039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission control with manual tv control
Assignee: Motors Liquidation Co
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Filing: 1973-09-12
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Granted: 1974-10-08
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Expires: 1993-09-12
Abstract
Abstract A hydraulic transmission control having a manual throttle valve pressure regulator for establishing throttle pressure and a shift modulator valve supplied by the throttle valve, for limiting the maximum shift throttle pressure supplied to the shift valves. Fluid pressure from the shift modulator valve is directed to the throttle valve to provide a balance on the throttle valve so that the operator will feel only a minimal increase in accelerator pedal force until the maximum shift throttle pressure is present.
Inventors
- 👤 C Shellman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:23
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0262; F16H61/0276; F16H61/029; F16H59/00; F16H59/14; F16H59/18; F16H59/20; F16H61/0265; F16H61/0267; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2607
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
A hydraulic transmission control for a throttle controlled engine driven transmission, said control comprising; a source of fluid pressure; throttle valve means including a manually operable input member having a pressure responsive area thereon, fluid operable valve means in fluid communication with said source for establishing a variable fluid pressure level in said control, spring means disposed between said input member and said fluid operated valve means for establishing a force on said fluid operated valve means proportional to movement of said input member, said variable pressure level being proportional to the force; and valve means for directing fluid communication of the variable pressure between said fluid operated valve and said pressure responsive area for balancing the force of said spring when the variable fluid pressure level is within a predetermined range and for maintaining the pressure on said pressure responsive area at a constant level when the variable pressure level is above the predetermined range.
Claim 2
Dependent Claim
156 words
A hydraulic transmission control for a throttle controlled engine driven transmission, said control comprising; a source of fluid pressure; throttle valve means including a manually operable input member having a pressure responsive area thereon, fluid operable valve means in fluid communication with said source for establishing a variable fluid pressure level in said control, spring means disposed between said input member and said fluid operated valve means for establishing a force on said fluid operated valve means proportional to movement of said input member, said variable pressure level being proportional to the force; and valve means for directing fluid communication of the variable pressure between said fluid operated valve and said pressure responsive area for balancing the force of said spring when the variable fluid pressure level is within a predetermined range and for maintaining the pressure on said pressure responsive area at a constant level when the variable pressure level is above the predetermined range.
Claim 3
Dependent Claim
231 words
A hydraulic transmission control for a throttle controlled engine driven transmission, said control comprising: a source of fluid pressure; throttle valve means including a movable manually operable input member having a pressure responsive area thereon, fluid operable valve means in fluid communication with said source for establishing a variable fluid pressure level in said control, spring means disposed between said input member and said fluid operated valve means for establishing a force on said fluid operated valve means proportional to movement of said input member, said variable pressure level being proportional to the force; a valve sleeve circumjacent said manually operable input member having a first fluid port and second fluid port, said ports being opened to fluid communication with said pressure responsive area upon movement of said manually operable input member to distribute pressure signals equal to the pressure in said pressure responsive area to said control; and valve means for directing fluid communication of the variable pressure between said fluid operated valve and said pressure responsive area for balancing the force of said spring when the variable fluid pressure level is within a predetermined range and for maintaining the pressure on said pressure responsive area at a constant level when the variable pressure level is above the predetermined range, and said second fluid port on said valve sleeve being opened while said constant level of pressure is being maintained.
Claim 4
Dependent Claim
231 words
A hydraulic transmission control for a throttle controlled engine driven transmission, said control comprising: a source of fluid pressure; throttle valve means including a movable manually operable input member having a pressure responsive area thereon, fluid operable valve means in fluid communication with said source for establishing a variable fluid pressure level in said control, spring means disposed between said input member and said fluid operated valve means for establishing a force on said fluid operated valve means proportional to movement of said input member, said variable pressure level being proportional to the force; a valve sleeve circumjacent said manually operable input member having a first fluid port and second fluid port, said ports being opened to fluid communication with said pressure responsive area upon movement of said manually operable input member to distribute pressure signals equal to the pressure in said pressure responsive area to said control; and valve means for directing fluid communication of the variable pressure between said fluid operated valve and said pressure responsive area for balancing the force of said spring when the variable fluid pressure level is within a predetermined range and for maintaining the pressure on said pressure responsive area at a constant level when the variable pressure level is above the predetermined range, and said second fluid port on said valve sleeve being opened while said constant level of pressure is being maintained.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |