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Variable speed drive unit

  • US 4,271,712 A
  • Filed: 04/20/1979
  • Issued: 06/09/1981
  • Est. Priority Date: 04/20/1979
  • Status: Expired due to Term
First Claim
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1. A variable speed drive unit for translating reciprocal motion into rotary motion and for selectively changing the ratio between the amplitude of the reciprocal motion and the degree of rotation of the rotary motion while said drive unit is in operation, said variable speed drive unit comprising:

  • (a) a frame,(b) an elongate flexible power transmission member having,a. a first end secured to said frame,b. a second end,c. a normally straight section intermediate said ends, andd. a drive section intermediate said straight section and said second end;

    (c) biasing means interconnected between the second end of said power transmission member and said frame for exerting tension upon said member;

    (d) means for angularly deflecting said straight section thereby urging reciprocal movement of said drive section;

    (e) a unidirectional drive element engaged with said drive section of said power transmission member and providing a unidirectional rotary output in response to the movement of said drive section; and

    (f) control means carried by said frame for selectively varying the angular deflection of said straight section of said power transmission member.

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