Power plants – Motor operated by expansion and/or contraction of a unit of... – Mass is a solid
Patent
1988-08-19
1990-06-12
Ostrager, Allen M.
Power plants
Motor operated by expansion and/or contraction of a unit of...
Mass is a solid
60528, F03G 706
Patent
active
049322109
ABSTRACT:
A shape memory metal actuator for accurately pointing or aligning a moveable piece of equipment or other object. The memory metal components (12, 14, 16, 18) are stretched along their axes and arranged in a push-pull configuration so that one element (14) in the activated state moves the object while another element (18) on the opposite side of the object is strained while it is in the soft state to act as a dynamic damper to prevent overtravel of the object. The wires can be heated with external heaters or by electrical current passed directly therethrough. Two separate actuator assemblies using orthogonal pairs of shaped memory metal wires (42, 44, 46, 48 and 52, 54, 56, 58) are used to enable pivotal movement about a floating pivot point 41, while a cantilevered arrangement of Nitinol bars (88, 90, 92 and 94) are used to enable pivotal movement about a fixed flexure point F.
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Creson June L.
Julien Gerald J.
Ostrager Allen M.
The Boeing Company
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