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Linkage device

  • US 4,912,994 A
  • Filed: 03/06/1989
  • Issued: 04/03/1990
  • Est. Priority Date: 03/06/1989
  • Status: Expired due to Fees
First Claim
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1. A linkage device connecting one end (12) of a first member (10) having a longitudinal axis (11) to an end (13) of a second member (14) and adapted to move said second member between a first position offset to one side of said first member and a second position in substantial longitudinal alignment with said first member, said device comprising:

  • a first pair of laterally-spaced interconnected plates (25,

         26) secured to and projecting outwardly from said one end of said first member;

    said first pair of plates having first and second ends (33,

         34) respectively remote from and nearer to said first member (10),a second pair of laterally-spaced interconnected plates (39,

         40) secured to and projecting outwardly from said end of the second member;

    said second pair of plates having first and second ends (42,

         43) respectively remote from and nearer to said second member;

    first bar means (20,

         21) having a first pivotal connection (35) between and to said first pair of plates at said first end (33) thereof;

    the end of said first bar means opposite from said first pivotal connection (35) having a second pivotal connection (45) to and between said second pair of plates at said second end (43) thereof;

    second bar means (22,

         23) having a third pivotal connection (46,

         47) to the outer sides of said second pair of plates (39,

         40) at said first ends (42) thereof, the end of said second bar means (22,

         23) opposite from said third pivotal connection (46,

         47) having a fourth pivotal connection (36,

         37) to said first pair of plates (25,

         26) at said second end (34) thereof; and

    means for pivoting said first bar means (20,

         21) about said first pivotal connection (35) whereby to rotate said second member approximately 180°

    about said one end (12) of said first member (10) between said first and said second positions.

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