Patent ID: 6762669
Filing Date: 2004-07-13
Classification: F03G

Abstract:
A bistable shape memory actuator device, comprising:a single shape memory actuator element connecting a support structure to an actuated member, for the purpose of moving the latter from a first position to a second position when the single shape memory actuator element is heated above a predetermined temperature, and return spring means for biassing the actuated member towards its first position, wherein holding means, suitable for holding the actuated member in its second position even when the single shape memory actuator element cools down, are associated with said single shape memory actuator element, said holding means being deactivated to allow the actuated member to return to its first position following a subsequent activation of the single shape memory actuator element, and wherein said return spring means include a cursor associated with the shape memory actuator element and a cam guide within which said cursor is engaged, and in which a first dead point and a second dead point are defined, where the cursor remains when the actuated member is in its first position or its second position, with the actuator element deactivated.