Expansible chamber devices – With inspection window in expansible chamber wall portion – With lock
Patent
1990-04-25
1991-09-24
Look, Edward K.
Expansible chamber devices
With inspection window in expansible chamber wall portion
With lock
92 18, 92 24, 92 27, 91 41, 91 44, F01B 2526
Patent
active
050504843
ABSTRACT:
A hydraulic actuator comprising a cylinder formed with an axial cylinder chamber, a main piston provided in the cylinder chamber and dividing the chamber into a first chamber and a second chamber and further formed with a locking chamber, an annular locking groove formed in the cylinder, a locking member cooperating with the annular locking groove to lock the main piston in a predetermined position, the locking member movable between an unlocking position and a locking position, a locking-unlocking piston for moving the locking member into the locking and unlocking positions, and a pressure introducing passageway for selecting the first or second chamber that is higher in pressure and introducing the higher pressure in the selected chamber into the locking chamber of the main piston. The locking-unlocking piston is moved by the pressure introduced by the pressure introducing passageway to move the locking member into the locking and unlocking positions.
REFERENCES:
patent: 2295961 (1942-09-01), Meyer
patent: 2323731 (1943-07-01), Shetzline
patent: 2582030 (1952-01-01), Halward
patent: 3108513 (1963-10-01), Koshobu
patent: 3605568 (1971-07-01), Nepp
patent: 4167891 (1979-09-01), Kamimura
patent: 4240332 (1980-12-01), Deutsch
patent: 4295413 (1981-10-01), Kamimura
patent: 4518309 (1985-05-01), Brown
Denion Thomas
Look Edward K.
Teijin Seiki Company Limited
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