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US 4,359,867 AGranted
Seat accumulator clutch booster assist
AssigneeInternational Harvester Company
InventorWilliam C. Swanson
Life of this patent
Estimating the term…
Abstract
A hydraulically actuated clutch booster utilizes a seat accumulator incorporated in a vehicle seat suspension circuit for a source of fluid pressure when the normal clutch booster fluid supply pump is not operating thereby providing hydraulic assist to operate the vehicle's clutch upon initial start up.
Claims9
In a vehicle having an operator accommodating seat and a hydraulic assisted clutch, the improvement comprising:
- a hydraulic seat suspension system having an accumulator for maintaining a supply of hydraulic fluid under pressure;
- a hydraulically assisted clutch booster including an operating pedal, said booster hydraulically communicating with said accumulator;
- a ball check valve normally closed between said accumulator and said clutch booster, said ball check valve mechanically operable to open upon displacement of said operating pedal whereby hydraulic fluid will flow from said accumulator to said clutch booster.
In a tractor vehicle having a primary source of hydraulic fluid, a seat incorporating a hydraulic suspension and a pedal operated clutch booster, the improvement comprising:
- a hydraulic accumulator hydraulically associated with said hydraulic suspension of said seat;
- an auxiliary supply conduit connected to said hydraulic accumulator;
- a ball check valve for interrupting flow through said auxiliary conduit responsive to position of said pedal;
- a first check valve between said primary source of hydraulic fluid and said clutch booster;
- a second check valve between said ball check valve and said clutch booster, said second check valve open only when said primary source of fluid is inoperative and said hydraulic accumulator has sufficient pressure to unseat said second check valve when said clutch pedal is depressed and said ball check valve is open.
2 more elements
Dependencies are inferred from the claim text.