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Temperature indicator

  • US 5,076,197 A
  • Filed: 12/06/1990
  • Issued: 12/31/1991
  • Est. Priority Date: 12/06/1990
  • Status: Expired due to Term
First Claim
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1. A temperature indicating device comprising:

  • a bimetallic element which is normally curved in a first direction, reverses its direction of curvature to a second direction of curvature when heated to a temperature above a predetermined upper threshold and returns to its normal first direction of curvature when it cools to a temperature below a predetermined lower threshold;

    a housing having an internal recess within which said bimetallic element rests when in its first direction of curvature; and

    a spring which exerts a force on said bimetallic element and which holds the bimetallic element securely in said internal recess when said bimetallic element has said first direction of curvature and which ejects said bimetallic element from said recess when said bimetallic element changes to said second direction of curvature.

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