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Adjustable support for CRT keyboard

  • US 4,616,798 A
  • Filed: 02/26/1985
  • Issued: 10/14/1986
  • Est. Priority Date: 06/07/1982
  • Status: Expired due to Term
First Claim
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1. In combination, a primary support defining thereon an enlarged upwardly facing primary work surface, said primary support defining a front edge adjacent said primary work surface, an auxiliary shelflike support defining thereon an upwardly facing auxiliary work surface for supporting a keyboard unit thereon, and mounting means connecting said primary and auxiliary work supports together for movably supporting said auxiliary support relative to said primary support in the vicinity of said side edge, the improvement wherein said mounting means comprises:

  • carriage means positioned under and movably mounted on the underside of said primary support for linear horizontal translation of said carriage means relative to said primary support along a direction which extends substantially transverse to said front edge;

    first means positioned under said primary support and mounted on said carriage means for pivotal movement relative thereto about a first substantially vertical hinge axis;

    second means mounted on the underside of said auxiliary support for pivotal movement relative thereto about a second substantially vertical hinge axis;

    vertically swingable, elongated link means having the opposite ends thereof pivotally connected to said first and second means for permitting vertical displacement of the auxiliary support relative to the primary support while maintaining said auxiliary support oriented so that the upper surface thereof retains its predetermined upwardly facing orientation, said link means comprising a vertical parallelogram linkage with elongated upper and lower links having their rearward ends pivotally interconnected to said first means and their forward ends pivotally interconnected to said second means;

    spring means associated with said link means for exerting a biasing force tending to swing said link means upwardly to effect raising of said auxiliary support; and

    holding means including a manually movable actuator for preventing vertical pivotal displacement of said parallelogram linkage.

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