Shape memory alloy wire actuated device

A release device comprising:

• a release mechanism configured to move a latch in a direction operable to release a retaining element in an assembly;
• a housing operably coupled to the release mechanism, the housing defining a first path;
• an elongated actuating element having a first portion operably coupled to the housing and a second portion operably coupled to the latch, the actuating element being disposed in the first path, the actuating element being made from a shape memory alloy have a transition temperature, the actuating element does not substantially change shape when a first current is applied to the elongated actuating element for a predetermined amount of time, and from the first size to a second size when a second current is applied to the elongated actuating element, the actuating moving the latch to release the retaining element at the second size;
• and
• a heat transfer material disposed between the housing and the actuating element.

A method of actuating a release device, the method comprising:

• applying a first electrical current to an actuating element, the actuating element being made from a shape memory alloy having a transition temperature;
• conducting heat from the actuating element to a housing via a heat transfer material, the heat transfer material being disposed between the actuating element and the housing, the heat transfer material and housing cooperating to maintain a temperature of the actuating element below the transition temperature when the first electrical current is applied for the predetermined amount of time, wherein the heat transfer material is a thermal grease;
• conducting heat from the housing to a heat sink, wherein the heat transfer material, housing, and heat sink cooperate to maintain the temperature of the actuating element below the transition temperature when the first electrical current is applied for the first predetermined amount of time
• applying a second electrical current to the actuating element;
• and
• changing the size of the actuating element to activate the release device when the second electrical current is applied to the actuating element.