Motors: expansible chamber type – Cyclically operable – Motive fluid constantly applied to one working member face
Patent
1991-12-26
1993-02-23
Look, Edward K.
Motors: expansible chamber type
Cyclically operable
Motive fluid constantly applied to one working member face
91417R, 91420, 1371163, F01B 718, F15B 1517
Patent
active
051880156
ABSTRACT:
An automatically sequenced hydraulic cylinder mechanism, including a hydraulic cylinder having a piston rod which is attached to a working member. The hydraulic system includes a pump which supplies hydraulic fluid to opposite sides of the cylinder. Due to the differential in surface area on opposite sides of the piston, the piston is moved in a direction to extend the piston rod. When the piston bottoms out in its stroke of travel, the pressure in the system is increased and the increased pressure will operate a three-position valve to decrease the pressure in one end of the cylinder and automatically retract the piston rod. The cylinder is thus automatically sequenced to extend the piston rod and retract the piston rod without the use of auxiliary switched or sensors.
REFERENCES:
patent: 2381923 (1945-08-01), Obtresal
patent: 2770222 (1956-11-01), Anderson
patent: 2991758 (1961-07-01), Pfau
patent: 3033170 (1962-05-01), Norton et al.
patent: 3685077 (1972-08-01), Hageman
patent: 3795255 (1974-03-01), Malott et al.
patent: 3943715 (1976-03-01), Miyao et al.
patent: 4555975 (1985-12-01), Lang et al.
Kelley Company Inc.
Look Edward K.
Nguyen Hoang
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