Spring Clutch

  • US 20070240964A1
  • Filed: 04/11/2007
  • Published: 10/18/2007
  • Est. Priority Date: 04/14/2006
  • Status: Active Grant
First Claim
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1. A spring clutch comprising an input member having a cylindrical clutch surface on its inner periphery, an output member mounted in said input member so as to be rotatable relative to said input member, and a cylindrical clutch spring mounted between said input member and said output member and including a torque transmission end through which torque is transmitted to said output member, wherein when said input member rotates in one direction, said clutch spring radially expands by contact with said clutch surface, thereby transmitting torque from said input member to said output member, and when the speed of said output member exceeds the speed of said input member, said clutch spring is radially compressed, thereby cutting off the transmission of torque from said input member to said output member, and wherein said clutch surface is formed with at least one large-diameter recess to allow radial expansion of several turns of said clutch spring.

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