Cyclical bi-directional rotary actuator

Details Cyclical bi-directional rotary actuator Cyclical bi-directional rotary actuator

1975-07-17

1977-03-01

Duggan, Donovan F.

Communications: electrical

Systems

Call station

310 4A, 60527, 75170, 337334, 751227, G08B 108

Patent

active

040104559

ABSTRACT:
A thermally powered rotary actuator is disclosed which is used for positioning a shaft in first and second positions which are disposed 180.degree. apart. A pair of heat extensible springs are attached to the shaft and to the frame of the rotary actuator for selectively rotating the shaft from one of its two positions to the other position upon the application of heat to one of the heat extensible springs. The heat extensible springs are preferably constructed from the alloy 55-Nitinol. In the preferred embodiment, a detent mechanism is provided for locking the rotatable shaft in its two rotary positions.

REFERENCES:
patent: 1987717 (1935-01-01), Smith
patent: 2819366 (1958-01-01), Kercher
patent: 3423608 (1969-01-01), Kerwin et al.
patent: 3446998 (1969-05-01), Murphy
patent: 3567523 (1971-03-01), Jackson et al.
patent: 3663839 (1972-05-01), Derr et al.
patent: 3754151 (1973-08-01), Clark
patent: 3802930 (1974-04-01), Brook et al.

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