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Electromagnetic clutch having a contractible friction shoe

  • US 4,201,281 A
  • Filed: 05/22/1978
  • Issued: 05/06/1980
  • Est. Priority Date: 05/22/1978
  • Status: Expired due to Term
First Claim
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1. A normally disengaged clutch comprising a rotatable driving member having a hub, a driven member rotatable about the same axis as the driving member, a radially contractible shoe surrounding said hub, resiliently yieldable coupling means connecting said shoe and said driven member for rotation in unison, said coupling means enabling radial contraction of said shoe around said hub and normally holding said shoe out of radial engagement with said hub, a helically coiled spring telescoped over said shoe and having one end secured to said driven member to rotate with the latter, means associated with said driving member and selectively operable to cause the opposite end of said spring to rotate with said driving member thereby to cause said spring to wrap down on said shoe and contract said shoe radially into frictional gripping engagement with said hub to transmit torque (1) from said hub to said shoe (2) from said shoe to said coupling means and (3) from said coupling means to said driven member.

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