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Bi-directional surface leveling system

  • US 6,168,348 B1
  • Filed: 01/16/1998
  • Issued: 01/02/2001
  • Est. Priority Date: 01/16/1998
  • Status: Expired due to Fees
First Claim
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1. A surface leveling system for grading earth and urged by a motion source, comprising:

  • a chassis comprising a rear support configured for attachment to said motion source, a forward frame attached to a wheel, a grader frame disposed between said rear support and said forward frame, said grader frame pivotably connected to said forward frame, a middle support extending from said grader frame and fixedly connected to said grader frame, a torque member extending above said grader frame and fixedly attached to said grader frame, and at least one upper link and one lower link substantially parallel to one another and each said links separately pivotably attached to both said rear support and to said middle support;

    a dampening assembly having upper and lower distal ends and disposed between said rear and middle supports, said upper distal end pivotably connected to said upper link adjacent said middle support, and said lower distal end pivotably connected to said rear support, said dampening assembly damping upwards and downwards movement of said grader frame;

    a box grader supported by said grader frame, said box grader including;

    a bi-directional earth grading tool, said bi-directional earth grading tool having a first soil grading surface facing in a first grading direction for grading in said first direction and a second soil grading surface facing in a second grading direction for grading in said second direction, said first grading direction opposite said second grading direction, and a pair of end plates, said bi-directional earth grading tool centrally and perpendicularly mounted to each said end plates, said end plates and said bi-directional tool defining a cavity on each side of said bi-directional earth grading tool, each of said cavities configured for collecting soil during grading;

    a piston pivotably connected to said forward frame and to said torque member whereby motion of said piston adjusts a distance of said grader frame and said earth grading tool relative to ground; and

    , a control unit for controlling the motion of said piston, said control unit attached to said chassis.

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