Post hole digger

Details Post hole digger Post hole digger

1994-02-23

1995-03-14

Buiz, Michael Powell

Boring or penetrating the earth

With tool drive prime mover or above-ground mechanical...

175203, E21B 700

Patent

active

053969677

ABSTRACT:
A post hole digger comprising a borer, an hydraulic driving motor for reversibly driving the borer and a frame on which the borer is mounted is described. This post hole digger has the advantage of being able to be disengaged from a hole being bored if the borer should become stuck. In addition, torque reaction from the borer striking obstructions is absorbed by the hydraulic relief valve. The borer and hydraulic motor are at opposite ends of the frame which has a fulcrum in between to allow the weight of one to counterbalance the weight of the other for ease of operation.

REFERENCES:
patent: 2320775 (1943-06-01), Garner
patent: 2734722 (1956-02-01), Pokorny
patent: 2815049 (1957-12-01), Herscovitch
patent: 3976147 (1976-08-01), Cunningham
patent: 4077480 (1978-03-01), Carlson et al.
patent: 4979578 (1990-12-01), Landry
patent: 4998590 (1991-03-01), Wells

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