Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1977-09-16
1978-07-18
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60418, 60423, 60433, 60484, 60DIG2, F15B 102, F15B 1116
Patent
active
041007395
ABSTRACT:
An improved pressure sensitive valving arrangement is provided for a power steering unit for a lift truck, and in particular for a battery powered lift truck. To the conventional implement valve is added an accumulator charging means which includes an additional valve, herein called a "blocking or control valve", which additional valve is downstream from the implement valve and which additional valve, when actuated, blocks the flow of fluid through the implement valve to thereby build up pressure for charging an accumulator. The blocking valve includes a blocking spool which operates against a pressure-actuated pilot plunger such that when the pressure in the accumulator reaches or exceeds a predetermined amount, the pilot plunger shifts the blocking spool to permit the fluid to again flow through the implement valve. The blocking spool is actuated by a force acting on a control member associated with the lift or tilt levers, or may be actuated independently by a mechanism responsive to reduced pressure in the accumulator. The pressure-responsive mechanism shifts the blocking spool to a blocking position to charge the accumulator whether or not one of the lift or tilt implement actuators has been in use and has been returned to its neutral position.
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patent: 3911679 (1975-10-01), Matthews
Caterpillar Tractor Co.
Geoghegan Edgar W.
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