Rotary stepping device with memory metal actuator

Details Rotary stepping device with memory metal actuator Rotary stepping device with memory metal actuator

1983-08-26

1987-05-12

Duggan, Donovan F.

Electrical generator or motor structure

Non-dynamoelectric

Thermal or pyromagnetic

337393, H02N 700

Patent

active

046653341

ABSTRACT:
A rotary stepping device includes a rotatable shaft which is driven by means of a coiled spring clutch which is alternately tightened to grip and rotate the shaft and released to return it to a resting position. An actuator formed of a memory metal is used to pull the spring clutch to tighten it and rotate the shaft. The actuator is activated by heating it above its critical temperature and is returned to an elongated configuration by means of the force of the spring clutch.

REFERENCES:
patent: 2096458 (1937-10-01), Johnson
patent: 3229177 (1966-01-01), Clarke
patent: 3403238 (1968-09-01), Buehler et al.
patent: 4010458 (1977-03-01), Stange

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