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Adjustable height load bearing support structure

  • US 5,722,331 A
  • Filed: 10/10/1996
  • Issued: 03/03/1998
  • Est. Priority Date: 04/18/1996
  • Status: Expired due to Fees
First Claim
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1. An adjustable load bearing support structure comprising:

  • a base frame;

    a generally planar support surface member;

    a pair of adjustable support assemblies configured to support said support surface member for vertical movement relative to said base frame;

    a pair of arms each being mounted for pivotable movement about an axis disposed beneath said support surface member and each having a free end provided with means for engaging one of said support assemblies;

    a torsion spring connected to each arm, each spring having a central axis substantially coincident with the axis of pivotable movement of each respective arm and configured to exert a biasing force on each respective arm which force is transferred by each arm to one of said support assemblies;

    a lever arm connected to each torsion spring and being configured to preload said springs when said lever arms are rotated;

    a cable connecting said lever arms; and

    means for tensioning said cable and thereby causing said lever arms to rotate and preload said springs.

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