One-directional drive apparatus

  • US 4,646,888 A
  • Filed: 05/15/1985
  • Issued: 03/03/1987
  • Est. Priority Date: 05/16/1984
  • Status: Expired due to Term
First Claim
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1. A one-directional drive apparatus with reverse drive prevention comprising:

  • a rotatable coil spring having a first radially inwardly projecting tab portion at one end thereof and a second radially inwardly projecting tab portion at the other end thereof, said portions being spaced circumferentially to provide an arcuate space therebetween;

    ring-like support means for and conforming to the opposite ends of said spring, each of said support means having a flange portion overlying and conforming to the corresponding end of said spring and the corresponding tab portion and a sleeve portion extending into and conforming to the interior of said spring and including a radially inwardly extending bulge portion embracing and conforming to the sides and end of the corresponding tab portion;

    a fixed braking ring member embracing said coil spring and restricting the unwinding thereof for engagement therebetween to brake rotation of said spring;

    a rotatable input member coaxial with said spring and adapted to be driven in either direction by a drive source, said input member having first and second diametric projections extending longitudinally into the interior of said ring, one of said projections being alternatively engageable with either of said support means bulge portions to move the corresponding tab portion in a direction to wind up said spring to thereby decrease the diameter thereof and release the braking thereof by said braking member; and

    a rotatable output member adapted to be connected to a member to be driven, said output member having first and second diametric projections extending longitudinally into the interior of said ring between said input member projections, one of said output member projections extending into said arcuate space for alternative engagement with either of said bulge portions to move the corresponding tab portion in a direction to unwind said spring and to thereby increase the diameter thereof and increase the braking thereof by said braking member.

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