Hydraulic actuators equipped with cushioning means

Details Hydraulic actuators equipped with cushioning means Hydraulic actuators equipped with cushioning means

1974-09-27

1976-09-14

Schwadron, Martin P.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Position responsive

91399, 91408, 91436, 91437, F15B 1522

Patent

active

039799980

ABSTRACT:
A hydraulic actuator comprising a pair of pressure oil chambers each of which has a cushioning port, the two cushioning ports being connected to each other through a cushioning means. The cushioning means includes a pair of cracking valves whose closing pressure is lower than its opening pressure and a pair of restricting means for restricting the flow of a pressure oil provided with regard to said cracking valves. This structure permits an output means for the actuator to be stopped smoothly as a result of fully absorbing the inertial energy that accompanies the output means.

REFERENCES:
patent: 2965133 (1960-12-01), Rice
patent: 3396635 (1968-08-01), Darling
patent: 3470792 (1969-10-01), Darling
patent: 3518829 (1970-07-01), Kamner
patent: 3631761 (1972-01-01), Rumsey
patent: 3777879 (1973-12-01), Dehne
patent: 3805825 (1974-04-01), Lovingham
patent: 3887160 (1975-06-01), Cusveller

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