Patent ID: 6129181
Filing Date: 2000-10-10
Classification: F03G,Y02E

Abstract:
An apparatus for applying rotational forces on a rotatable device comprising:first shape memory alloy spring means connected to said rotatable device which exerts a first force on the rotatable device in a first rotational direction, the first shape memory alloy spring means has a first modulus of elasticity and upon application of heat to a selected area of the first spring means effects a austenite state in the selected area of the first spring means that creates a second modulus of elasticity and changes the first force; andsecond shape memory alloy spring means connected to said rotatable device which exerts a second force on the rotatable device in a second rotational direction which is opposite the first rotational direction, the second shape memory spring means has a first modulus of elasticity and upon the application of the heat to a selected area of the second shape memory alloy spring means effects the austenite state in the selected area that creates a second modulus of elasticity which changes the second force.