Motors: expansible chamber type – Working member position responsive motive fluid control – Working member carries part within working chamber which...
Patent
1980-12-18
1983-09-20
Maslousky, Paul E.
Motors: expansible chamber type
Working member position responsive motive fluid control
Working member carries part within working chamber which...
91404, 91417R, 91448, 91461, 91519, F15B 1522
Patent
active
044048920
ABSTRACT:
A hydraulic operating apparatus including an actuating cylinder having a piston arranged therein and moved by a fluid under high pressure further includes a control valve having only one metallic seal whether the piston is at its upper or lower positions. The control valve is operative to apply the fluid under high pressure to a pressure receiving surface of the piston on the opposite side of a piston rod to move the piston in a direction in which the piston rod extends from the piston and to discharge the fluid existent on the opposite side of the piston rod from the actuating cylinder to move the piston in a direction opposite the direction in which the piston rod extends from the piston. The hydraulic operating apparatus further includes a seal for dividing the pressure receiving surface of the piston on the opposite side of the piston rod into first and second pressure receiving surface sections, the first pressure receiving surface section having an effective pressure receiving area smaller than that of a pressure receiving surface of the piston on the side of the piston rod.
REFERENCES:
patent: 3363512 (1968-01-01), Ottestod
patent: 3363513 (1968-01-01), Ottestod
patent: 3418887 (1968-12-01), Matteson
patent: 3817152 (1974-06-01), Viron
patent: 3969985 (1976-07-01), Grieger et al.
Akasaka Yoshimichi
Ichiryu Ken
Nakamura Ichiro
Takenoshita Mitsuaki
Watanabe Haruo
Hitachi , Ltd.
Maslousky Paul E.
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