Shape memory alloy actuator

Details Shape memory alloy actuator Shape memory alloy actuator

2005-02-08

2005-02-08

Richter, Sheldon J (Department: 3748)

Power plants

Motor operated by expansion and/or contraction of a unit of...

Mass is a solid

C060S641100, C060S641600, C310S306000, C337S140000, C374S112000, C446S014000

Reexamination Certificate

active

06851260

ABSTRACT:
A shape memory alloy actuator comprising a body (1) connected through an arm (5) with an activating member (15), the body (1) being arranged for rotation around a pivot (2) and connected to a first wire (9) and a second wire (10) of a shape memory alloy such as nitinol and to a biasing means such as a tension spring (6) such that heating and therefore shortening of the wire (10) rotates the body (1) counter-clockwise such that the tension spring (6) is in its cocked position while heating (shortening) of the wire (9) and cooling (lengthening) of the wire (10) to the position shown in10arotates the body (1) clockwise past a balance point for the tension spring (16) whereafter the body (1) rotates further clockwise under the influence of the tension spring (6), thereby exerting a relatively powerful actuation of the activating member (15), the whole cyclus being repeated by heating wire (10) causing it to shorten and rotate the body (1) counter-clockwise until the spring (6) is cocked again.

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