Hydraulic actuator having fail-safe feature with energy absorbin

Details Hydraulic actuator having fail-safe feature with energy absorbin Hydraulic actuator having fail-safe feature with energy absorbin

1990-07-31

1991-08-06

Look, Edward K.

Expansible chamber devices

Piston with rigid axially extending hollow stem

Relatively movable elongated part within stem

92130R, 92DIG4, 92165R, 100269R, F01B 300, F16J 1518, B30B 123

Patent

active

050367528

ABSTRACT:
Hydraulic actuator comprises a piston-cylinder which has a fail-safe feature in the form of a lost motion coupling between the cylinder head and portions of the cylinder. The coupling comprises a constraining rod which is secured to the cylinder at the opposite end thereof from the cylinder head. The constraining rod extends into a bore in the piston rod and has a shoulder which is opposed to a shoulder on the piston. The amplitude of the lost motion is such that the coupling does not interfere with normal operation of the actuator but is effective in the event of failure of the cylinder or cylinder head. The lost motion coupling would prevent movement of any parts broken away by the fracture any significant distance from the remaining parts of the cylinder. An energy absorbing means is provided in the lost motion coupling. A second lost motion coupling is provided between the end of the cylinder and the external surface of the cylinder head.

REFERENCES:
patent: 3902404 (1975-09-01), Breit
patent: 4907496 (1990-03-01), Neal
AMP drawing No. D 69060 entitled "Crimping Head Assembly".

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