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US 4,191,053 AGranted
Temperature-responsive actuator
AssigneeDelta Materials Research Limited
InventorsWilliam B. Hart, Reginald T. Williams
Life of this patent
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Abstract
A differential temperature detector comprises two springs made of a shape memory effect alloy. The springs are oppositely stressed and are coupled together in stressed condition. When the springs are subject to the same temperature, no movement occurs when that temperature changes, but when the springs are subject to different temperatures, movement occurs dependent on the temperature difference.
Claims11
A differential temperature detector comprising
- (a) a first resilient member having a fixed part and a relatively movable part;
- and
- (b) a second resilient member having a fixed part and a relatively movable part;
- (c) each of said first and second resilient members being made essentially of a shape memory effect material having an elastic modulus which varies significantly with temperature in a reversible manner over a transition temperature range,
- (d) said movable parts of said resilient members being coupled together with said members stressed in opposition,
- (e) whereby the position of said movable part of one of said members relative to said fixed part is indicative of the difference in temperatures of said members.
3 more elements
Dependencies are inferred from the claim text.