Self-refilling hydraulic actuator

Details Self-refilling hydraulic actuator Self-refilling hydraulic actuator

1979-07-02

1981-07-28

Butler, Douglas C.

Brakes

Internal-resistance motion retarder

Having a thrust member with a variable volume chamber

188315, 188318, F16F 920

Patent

active

042806003

ABSTRACT:
A piston slides in a fluid-filled piston chamber for damping or snubbing the movement of an object connected thereto. Attached to the piston is a piston rod which is disposed in the main fluid supply reservoir located below the piston chamber, at the lowest point in the apparatus. As the piston moves, the associated movement of this rod in the reservoir varies its displacement therein, thereby displacing fluid into a vented secondary reservoir which is located above the piston chamber, at the highest point in the damper apparatus. Any leakage from the piston chamber collects in the reservoirs. Both reservoirs are in fluid supply connection with the piston chamber so that piston movement causes fluid to flow into the chamber from the reservoirs so as to keep the chamber completely filled with fluid at all times. Both reservoirs supply fluid to the piston rod seals, which are thereby always immersed in fluid.

REFERENCES:
patent: 404012 (1889-05-01), Nickerson
patent: 2060590 (1936-11-01), Padgett
patent: 2849090 (1958-08-01), DeKoning et al.
patent: 3076643 (1963-02-01), Bittel

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