Linear actuator with speed controlling brake

Details Linear actuator with speed controlling brake Linear actuator with speed controlling brake

1993-02-19

1995-03-21

Herrmann, Allan D.

Motors: spring, weight, or animal powered

Spring

With winding means

74 2, 74 8915, 188185, 244 58, 254103, F03G 110, F16H 2522, G05G 1700

Patent

active

053987802

ABSTRACT:
An actuator suitable for use as an ejection jack for deploying an aircraft mounted ram air turbine is provided. The actuator utilizes a spring powered ballscrew operatively coupled to a centrifugally actuated brake in such a manner that the brake limits the speed of reciprocating movement of the ballscrew. The problems of fluid leakage and slow deployment at cold temperatures, often encountered in prior ejection jacks utilizing hydraulic dashpots for speed control, are thus eliminated. The actuator also includes a locking device for locking the actuator in either an extended or a retracted position. Features are also provided for attaching an external drive mechanism in a manner allowing the ballscrew to be utilized for resetting the actuator to an initial non-extended position.

REFERENCES:
patent: 1579788 (1926-04-01), Schwerin
patent: 2587652 (1952-03-01), Rostine
patent: 2946235 (1960-07-01), Musser
patent: 3127788 (1964-04-01), Martens
patent: 3730015 (1973-05-01), Cornell
patent: 3766698 (1973-10-01), Kusiak
patent: 4411596 (1983-10-01), Chilman
patent: 4479397 (1984-10-01), Jelinek et al.
patent: 4630866 (1986-12-01), McFarlane
patent: 4675938 (1987-06-01), Bundschuh
patent: 4676458 (1987-06-01), Cohen
patent: 4717095 (1988-01-01), Cohen
patent: 4742976 (1988-05-01), Cohen
patent: 5048151 (1991-09-01), Orii et al.
patent: 5195937 (1993-03-01), Engel et al.

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