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Fixed torque spring clutch

  • US 5,273,229 A
  • Filed: 06/05/1991
  • Issued: 12/28/1993
  • Est. Priority Date: 10/02/1990
  • Status: Expired due to Term
First Claim
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1. A fixed torque spring clutch comprising:

  • a first rotor;

    a second rotor coaxial with said first rotor;

    a shaft section on one of said rotors;

    a plurality of catch sections on the other rotor; and

    a coil spring covering said shaft section, said coil spring having a first end engaging one of said catch sections and a second end engaging another of said catch sections, to define a first state of said coil in which said coil has a diameter that is less than the diameter thereof in the absence of engagement of said first and second ends and catch sections, said coil spring being divided into a first clamping section which clamps said shaft section with a predetermined force in the first state, and a second clamping section which has a clearance with respect to said shaft section in said first state,whereby the torque T transmitted between said rotors via said coil spring, is equal to T1 -T2, wherein T1 is an elastic force between said one catch section and said first end of said coil spring and T2 is an elastic force between said another catch section and said second end of said coil spring, when one of said rotors is rotated with respect to the other of said rotors.

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