Multiple-stage hydraulic cylinder

Details Multiple-stage hydraulic cylinder Multiple-stage hydraulic cylinder

1995-11-22

1997-03-25

Nguyen, Hoang

Motors: expansible chamber type

Extension of unit having separately controlled working...

Vane

92 52, 92 53, F15B 1118, F01B 720

Patent

active

056134185

ABSTRACT:
A multiple-stage hydraulic cylinder for shifting loads by exerting different forces over different distances, in which a hollow-piston cylinder is provided with a hollow piston rod. The hollow piston rod accommodates at least one additional long-stroke cylinder. The hollow piston rod, moreover, comprising a cylinder tube surrounding the long-stroke cylinder. Connections are provided for hydraulic fluid to move the cylinders. These connections are provided on the hollow piston rod and the long-stroke cylinder for admitting fluid to move the hollow-piston cylinder and the long-stroke cylinder.

REFERENCES:
patent: 2829499 (1958-04-01), Ferguson et al.
patent: 3213765 (1965-10-01), Knable
patent: 3269275 (1966-08-01), Waite
patent: 3957125 (1976-05-01), Russell
patent: 4523512 (1985-06-01), Hessel et al.
patent: 4881211 (1989-11-01), Myers
patent: 4928488 (1990-05-01), Hunger
patent: 4936193 (1990-06-01), Stoll

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