Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Patent
1990-04-02
1992-05-26
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
91454, 91465, 91519, 91532, F15B 1100, F15B 1300
Patent
active
051157209
ABSTRACT:
An industrial truck has a hydraulic fluid supply and at least one double-acting hydraulic cylinder assembly for moving a movable element of the vehicle. The cylinder assembly includes a cylinder having a fluid chamber therein, and a piston movable axially in the cylinder. An actuator rod extends from the piston for connection to the movable element. The piston divides the fluid chamber into a rod end chamber and a piston end chamber each having hydraulic fluid therein. A pair of two-way two-position poppet valves are selectively actuatable between a first joint state in which both of the valves are in a normally closed position in which the piston does not move; a second joint state in which a first one of the valves is closed and a second one of the valves is open to move the piston in a first direction; and a third joint state in which the first one of the valves is open and the second one of the valves is closed to move the piston in a second direction opposite to the first direction.
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Babson Vincent L.
Hagelbarger Lee A.
Baker Material Handling Corporation
Look Edward K.
Nguyen Hoang
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