Motors: expansible chamber type – Working member position responsive motive fluid control – Exhaust control
Patent
1977-08-02
1979-09-18
Hershkovitz, Abraham
Motors: expansible chamber type
Working member position responsive motive fluid control
Exhaust control
91410, 92 5L, 92 24, 92 27, 92108, F15B 1522, F01B 2526, F15B 1526
Patent
active
041678915
ABSTRACT:
Herein disclosed is a hydraulic actuator which comprises an outer cylinder; an inner cylinder attached at its one end to the axial inner one end of the outer cylinder in coaxial relation with the outer cylinder to define an annular gap between the outer and inner cylinders; a piston having a hollow bore axially extending from its one end to the other end and closed at the other end and slidably received in the annular gap; and a locking mechanism temporarily locking the piston with the outer cylinder upon the farthest movement of the piston to the other end thereof; the locking mechanism including a locking member coupled with one end portion of the piston and which is radially movable, a ram resiliently received in the other end of the inner cylinder and having an inclined stepped portion and a hollow bore axially extending from its one end to the other end and opened at the other end, and an annular locking groove formed at the inner periphery of the other end of the outer cylinder, whereby the locking member is brought into engagement with the stepped portion and then received in the locking groove to temporarily lock the piston with the outer cylinder.
REFERENCES:
patent: 2803222 (1957-08-01), Bukoff
patent: 3180234 (1965-04-01), Crawley
patent: 3605568 (1971-09-01), Nepp
patent: 3946642 (1976-03-01), Bogenschutz
patent: 3986438 (1976-10-01), Wittren
Hershkovitz Abraham
Teijin Seiki Company Limited
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