Arrangement in a hydraulic cylinder

Details Arrangement in a hydraulic cylinder Arrangement in a hydraulic cylinder

1997-03-13

1998-07-28

Lopez, F. Daniel

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Second path activated in response to pressure or flow in...

91422, 91436, 91529, F15B 1304

Patent

active

057849439

ABSTRACT:
A hydraulic actuator includes three cylinder spaces: a first cylinder space (6) located between a ring piston and a cylinder; a second cylinder space (7) between the ring piston and an auxiliary piston inside a hollow piston rod connected to the ring piston; and the third cylinder space (8) formed between the ring piston, the cylinder and the hollow piston rod. The hydraulic actuator includes a non-return valve (11) mounted in the ring piston between the second cylinder space and the third cylinder space, allowing flow from the second cylinder space into the third cylinder space when pressure in the second cylinder space exceeds pressure in the third cylinder space; a non-return valve (10) mounted in the ring piston between the second cylinder space and the first cylinder space, allowing flow from the second cylinder space into the first cylinder space when pressure in the second cylinder space exceeds pressure in the first cylinder space; and a pressure limit valve (14) for controlling fluid flow into the cylinder spaces depending on pressure in the first channel when the actuator is lengthened.

REFERENCES:
patent: 2431032 (1947-11-01), Ernst
patent: 3071926 (1963-01-01), Olsen et al.
patent: 3447424 (1969-06-01), Billings
patent: 3474708 (1969-10-01), Schmiel
patent: 3592108 (1971-07-01), Rosaen
patent: 3596561 (1971-08-01), Keller
patent: 3817152 (1974-06-01), Viron
patent: 4194436 (1980-03-01), Imada
patent: 4509405 (1985-04-01), Bates
patent: 5233909 (1993-08-01), Von Hoene

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