초록 ▼

A bi-directional surface leveling system comprises a chassis attachable to a motion source and having a hitch, a grader frame pivotably connected to the hitch and supporting a box grader, and a forward frame pivotably attached to the grader frame and having a caster wheel for supporting the chassis.

A bi-directional surface leveling system comprises a chassis attachable to a motion source and having a hitch, a grader frame pivotably connected to the hitch and supporting a box grader, and a forward frame pivotably attached to the grader frame and having a caster wheel for supporting the chassis. The box grader holds a bi-directional earth grading tool. Also included is a damping assembly attached to the hitch to dampen upward movement of the grader frame. A powered assembly is pivotably connected at one end to the forward frame and at the opposing end to the grader frame, and a control unit connected to the power assembly selectively extends and retracts the power assembly.

대표청구항 ▼

[ What is claimed is:] [1.] A surface leveling system for grading earth and urged by a motion source, comprising:a chassis comprisinga 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 f

[ What is claimed is:] [1.] A surface leveling system for grading earth and urged by a motion source, comprising:a chassis comprisinga 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, andat 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, anda 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.