Power plants – Pressure fluid source and motor – Having apparatus control by timer or delay means
Patent
1984-04-13
1985-10-29
Look, Edward K.
Power plants
Pressure fluid source and motor
Having apparatus control by timer or delay means
60431, 417 12, 417 34, 417 25, F15B 2110
Patent
active
045494002
ABSTRACT:
An electroresponsive device is energized to actuate an internal combustion engine throttle for switching the engine from idle to a higher speed. The engine drives a hydraulic pump that supplies fluid through a control valve, then a cylinder lock, for driving hydraulic work cylinders. A first switch responds to a low pressure level being exceeded, due to fluid being directed by the control valve to an actuator, to increase engine speed, thereby making the pump pressure higher. A second switch responds to the higher pressure to continue the increased engine speed. When the control valve is restored to neutral position, the hydraulic fluid bypasses through the control valve directly to a sump and the second switch responds to the lower pressure by allowing the engine to go idle speed. A time delay device is provided for disabling the first switch during the time that pressure is dropping from the higher level to below the lower level.
REFERENCES:
patent: 2643515 (1953-06-01), Harsch
patent: 2646205 (1953-07-01), Rosenschold
patent: 3111903 (1963-11-01), Waterman
patent: 3159965 (1964-12-01), Woolley et al.
patent: 4180374 (1979-12-01), Bristow
patent: 4330238 (1982-05-01), Hoffman
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