Hydraulic cylinder extending in three force modes

Details Hydraulic cylinder extending in three force modes Hydraulic cylinder extending in three force modes

1981-01-21

1983-03-01

Nilson, Robert G.

Motors: expansible chamber type

Differential

Opposing pressure applied by bypassing

91422, 91436, F15B 1517, F15B 13042

Patent

active

043751814

ABSTRACT:
A multiple mode hydraulic piston assembly employing a regenerative hydraulic circuit which when incorporated in the piston of a hydraulic cylinder and assembled with a pressureized hydraulic source through appropriate piping and valving, will sequentially permit, restrict, and block liquid flow through the piston and will thus extend its piston rod in multiple force modes, namely a low force rapid extension mode, a moderate force rapid extension mode, and a high force extension mode. In response to fluid pressures within the cylinder chamber the multiple mode piston assembly automatically changes operational modes. First bi-directional flow is provided between opposing chambers, then uni-directional flow is provided from the rod end to the back end chamber, and finally flow between the chambers is blocked. A modified embodiment provides a free motion mode wherein a modest external force can displace the piston in either direction. An additional embodiment provides an arrangement of the elements offset from the geometrical axis of the piston. An embodiment of the foregoing construction provides a double-ended piston rod configuration.

REFERENCES:
patent: 2283124 (1942-05-01), Peterson
patent: 2800110 (1957-07-01), Haarmeyer
patent: 2875732 (1959-03-01), Hoffman
patent: 3071926 (1963-01-01), Olson
patent: 3990420 (1976-11-01), Bitterman
patent: 4258609 (1981-03-01), Conway

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