Motors: expansible chamber type – With motive fluid valve – Relatively movable inlet and exhaust valves for single...
Patent
1990-08-17
1992-06-30
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Relatively movable inlet and exhaust valves for single...
91418, 269 32, 269238, 269 6, 294 88, F15B 1108, F15B 1304
Patent
active
051253240
ABSTRACT:
A hydraulically operated device including a single-acting cylinder having a piston for operating a working tool, a pressure chamber for applying a hydraulic pressure to the piston from an original position to an operated position, and a return spring for biasing the piston toward the original position. The device includes a hydraulic pump for delivering a pressurized fluid to be fed into the pressure chamber of the cylinder, and an automatic drain valve for inhibiting the pressurized fluid from being discharged from the pressure chamber while a difference by which a delivery pressure of the pump is higher than a pressure in the pressure chamber exceeds a predetermined value. When the difference becomes smaller than the predetermined value, the automatic drain valve is operated to allow the pressurized fluid to be discharged from the pressure chamber. Thus, the automatic drain valve automatically drains the pressure chamber when the pump is turned off.
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Araki Masaharu
Kumazaki Toshiyuki
Daia Industry Co. Ltd.
Look Edward K.
Ryznic John
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