Method and apparatus for forming square holes for posts

Details Method and apparatus for forming square holes for posts Method and apparatus for forming square holes for posts

2006-03-07

2008-07-29

Neuder, William P (Department: 3672)

Boring or penetrating the earth

Boring without earth removal

C175S162000

Reexamination Certificate

active

07404453

ABSTRACT:
A tool for expanding a hole having a vertical axis in the earth has at least one set of two opposed compactor units constrained to separate and retract in a direction at a right angle to the axis of the hole, and a drive mechanism coupled to the set of compactor units providing force to separate the compactor units, urging the units against a wall or walls of the hole, compacting the earth and enlarging the hole.

REFERENCES:
patent: 4770256 (1988-09-01), Lipsker et al.
patent: 7080697 (2006-07-01), Mocivnik
patent: 2000-248867 (1999-03-01), None

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