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Positioning device using negative spring-rate tensioning means

  • US 3,940,935 A
  • Filed: 02/22/1974
  • Issued: 03/02/1976
  • Est. Priority Date: 03/31/1972
  • Status: Expired due to Term
First Claim
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1. Positioning apparatus of the type comprising:

  • an element at least one spatial dimension of which is variable with temperature, said element being connected to a spring arranged to develop a force tending to oppose such temperature-induced dimensional change of said element;

    means to controllably change the temperature of said element in response to changes in an applied signal;

    that improvement in such apparatus wherein said spring means has a negative spring rate.

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