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Coiled and non-coiled twisted polymer fiber torsional and tensile actuators

  • US 9,903,350 B2
  • Filed: 08/01/2013
  • Issued: 02/27/2018
  • Est. Priority Date: 08/01/2012
  • Status: Active Grant
First Claim
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1. A thermally-powered coiled polymer fiber tensile actuator comprising a twisted, chain-oriented polymer fiber in the shape of a coil, wherein(a) the thermally-powered coiled polymer fiber tensile actuator has a first length at a first temperature at an applied load;

  • (b) the thermally-powered coiled polymer fiber tensile actuator has a second length at a second temperature at the applied load;

    (c) the first length and the second length are different in length by at least 5%;

    (d) the thermally-powered coiled polymer fiber tensile actuator is operable to reversibly change back and forth between the first length and the second length by changing temperature between the first temperature and the second temperature at the applied load; and

    (e) the thermally-powered coiled polymer fiber tensile actuator is a thermally-powered, non-electrochemical coiled polymer fiber tensile actuator.

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