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Thermal switch

  • US 4,862,133 A
  • Filed: 08/29/1988
  • Issued: 08/29/1989
  • Est. Priority Date: 03/29/1988
  • Status: Expired due to Fees
First Claim
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1. A thermal switch comprising a base, a fixed contact means and a movable contact means mounted on said base, a bimetallic element disposed on said base and operable upon being heated to deflect and to cause said movable contact means to be out of contact with said fixed contact means and to thereby dispose the switch in an open state, said switch having a closed state in which said movable contact means is biased into contact with said fixed contact means and current flows along a current path which includes said movable contact means and said fixed contact means, said base being connected electrically in parallel with said current path, said base being made of an electrically conductive plastic material having a resistance such that said base does not generate heat when the switch is in said closed state, said base being operable to generate heat when said switch is in said open state to maintain said bimetallic strip in said deflected state.

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