Hydraulic earth leveling machine

Details Hydraulic earth leveling machine Hydraulic earth leveling machine

1997-04-25

1998-05-26

Chin-Shue, Alvin C.

Fire escape, ladder, or scaffold

Ladder

Supporting surface compensating means

2481883, E06C 744

Patent

active

057553076

ABSTRACT:
A hydraulic earth leveling machine has a pair of legs, and cross pieces to connect the legs together. The hydraulic earth leveling machine is attached to a ladder by clamps on the cross pieces. The legs of the hydraulic earth leveling machine telescope; and, as long as there is the weight of the ladder only, the legs freely telescope so the ladder can be set vertically regardless of the slope or obstacles of the terrain. Fluid cylinders within the legs move freely with only the weight of the ladder, the fluid flowing back and forth between the two cylinders to allow motion of the two legs. When additional weight is added to the weight of the ladder, fluid pressure causes control valves to close and prevent fluid flow from either fluid cylinder, so the hydraulic earth leveling machine is locked and stable. The legs have feet that grip the ground to assist in stabilizing the ladder.

REFERENCES:
patent: 2552941 (1951-05-01), Courtney
patent: 2598875 (1952-06-01), Anderson
patent: 4095671 (1978-06-01), Forristall
patent: 5044468 (1991-09-01), Worthington

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