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Power unit

  • US 4,779,474 A
  • Filed: 07/23/1986
  • Issued: 10/25/1988
  • Est. Priority Date: 11/28/1984
  • Status: Expired due to Fees
First Claim
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1. A power unit for reciprocally transferring an article between a pair of load members;

  • an elongated housing mounted to one of said pair of load members, said housing having a pair of side walls and a base defining a center region, said housing having a rectangular cross section having a predetermined width greater than a predetermined height, said housing having a longitudinal axis normal to both said height and width;

    a second member extensibly mounted within said center region of said housing, said second member reciprocally extensible from said center region of said housing to an other of said pair of load members in a direction extending along said longitudinal axis of said housing;

    a third member extensibly mounted in said center region of said housing, said third member having a frame;

    means for displacing said third member relative to said housing, said means for displacing is mounted within said housing on a plane extending through said longitudinal axis of said housing, said plane extending in the direction of said height of the housing and defining a plane of symmetry,two pairs of wheels rotatably mounted to said frame of said third member, each wheel having an axis of rotation parallel to said symmetry plane, one pair of said two pair of wheels mounted on either side of said symmetry plane such that said two pair of wheels form a mirror image about said symmetry plane,two flexible transmission loops, each of said two loops being supported on a respective pair of said two pair of wheels, each loop having a first connection to said housing and a second connection to said second member such that said second member is displaced a predetermined first distance relative to said third member when said third member is displaced a second predetermined distance relative to said housing by said means for displacing, said second member is displaced a third predetermined distance relative to said housing equal to a sum of said first predetermined distance and said second predetermined distance;

    said pair of loops with said respective pairs of wheels lie in a second plane normal to said symmetry plane.

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