Expansible chamber devices – With inspection window in expansible chamber wall portion – With lock
Patent
1980-06-02
1981-10-20
Hershkovitz, Abraham
Expansible chamber devices
With inspection window in expansible chamber wall portion
With lock
92 24, 92 27, F01B 2526
Patent
active
042954134
ABSTRACT:
A hydraulic actuator comprises: a cylinder; a piston axially slidably received in the cylinder and having a hollow bore axially extending therein; at least a locking member radially movably retained in the piston; a ram axially slidably received in the hollow bore of the piston and having an inclined portion connecting a lower engaging portion and an upper engaging portion with a circumferential length longer than that of said lower engaging portion, said inclined portion being slidably engageable with the radially inner face of the locking member for radial movement thereof; a switch piston radially slidably mounted on the cylinder to have a radially inner face engageable with the radially outer face of the locking member; and detecting means for detecting the piston under conditions locked and unlocked with the cylinder by detecting radial movement of the locking member through the switch piston. One type of the actuators has a stepped portion which is formed on at least one of the inclined portion of the ram and the radially inner face of the locking member.
REFERENCES:
patent: Re28967 (1976-09-01), Weiss
patent: 3107582 (1963-10-01), Royster
patent: 3216332 (1965-11-01), De Chambeau
patent: 3359862 (1967-12-01), Modridi
patent: 3453937 (1969-07-01), Haberman
patent: 3584544 (1971-06-01), Haberman
patent: 3605568 (1971-09-01), Nepp
patent: 3661053 (1972-05-01), Rich
Hershkovitz Abraham
Teijin Seiki Company Limited
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