Land vehicles – Wheeled – Occupant propelled type
Patent
1977-05-12
1978-05-02
Bertsch, Richard A.
Land vehicles
Wheeled
Occupant propelled type
280234, B62M 112
Patent
active
040871053
ABSTRACT:
A bicycle that is powered by a hydraulic motor operatively associated with the rear wheel of the vehicle, with the actuation being by fluid under pressure delivered to the motor by a first rotary pump actuated by the feet of the rider, and a second pump that is energized by reciprocal up and down movement of the handle bars of the vehicle. The first and second pumps may be operated either independently or jointly. The bicycle includes a reservoir for hydraulic fluid and an accumulator for hydraulic fluid that is maintained in a pressurized condition therein. A manually operated, multiposition valve mounted on the vehicle permits the rider to control the flow of the hydraulic fluid. When the valve is in a first position and either the first or second pump actuated, hydraulic fluid is drawn from the reservoir, discharged through the motor to rotate the rear wheel of the vehicle, and the fluid thereafter discharged back to the reservoir. When the bicycle is coasting downhill, and the valve is placed in a second position, the motor temporarily acts as a pump, and forces hydraulic fluid into the accumulator and be pressurized therein. Pressurized fluid from the reservoir is released to discharge to the motor to rotate the latter and the rear wheel of the vehicle, when the valve is placed in a third position. A manually operated throttle valve controls the flow of hydraulic fluid from the discharge opening of the pump prior to the fluid returning to the reservoir. The throttle valve is normally open, but as it is gradually closed by the rider, the throttle valve restricts the flow of fluid discharging from the motor and as a result the motor acting as a brake to slow down the movement of the bicycle. When the throttle valve is completely closed, fluid cannot discharge from the motor, and the rear wheel cannot rotate relative to the frame of the bicycle and will actually skid on the supporting surface.
REFERENCES:
patent: 3729213 (1973-04-01), Hudspeth et al.
patent: 3811704 (1974-05-01), Gregoric
patent: 3850448 (1974-11-01), Stewart
Babcock William C.
Bertsch Richard A.
Mar Michael
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