Pump arrangement for a linear fluid operated device

Details Pump arrangement for a linear fluid operated device Pump arrangement for a linear fluid operated device

1983-02-07

1985-04-09

Schafer, Richard E.

Expansible chamber devices

With force exerting means to move fluid from non-working...

92 82, 92 86, 92181P, F15B 2104

Patent

active

045094098

ABSTRACT:
This invention relates to a pump arrangement (54) for use in a linear fluid operated device having a reciprocating piston (14) separating a first active fluid chamber (30) and a second chamber (32) which eliminates the problem associated with fluid leakage buildup developing in the second chamber. The pump arrangement (54) is connected to the reciprocating piston (14) and pumps leakage fluid present in the second chamber (32) from the second chamber (32) and into the first chamber (30) in response to a force of a preselected minimum magnitude being applied to the pump arrangement (54). Thus, the problems of inefficient linear fluid operated device operation, reduced piston stroke length, external fluid leakage, and erratic piston travel speed are eliminated. The pump arrangement (54) is particularly suited for use in a single acting linear hydraulic jack (12) such as used on a material handling vehicle.

REFERENCES:
patent: 3293994 (1966-12-01), Napolitano
patent: 3311026 (1967-03-01), Crisp
patent: 3578882 (1971-05-01), Janssen
patent: 3991832 (1976-11-01), Cooper
patent: 4023363 (1977-05-01), Liebert

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