Device for high-speed boring of stepped post-holes

Details Device for high-speed boring of stepped post-holes Device for high-speed boring of stepped post-holes

1979-06-01

1981-04-28

Pate, III, William F.

Boring or penetrating the earth

Boring without earth removal

Combined with earth removal

175 84, 175173, 175251, 175385, E21B 726

Patent

active

042639751

ABSTRACT:
The bottom annular flange of a bearing sleeve which is displaceable with respect to a support frame is applied against the ground surface around the zone of a hole to be bored. A cylindrical cutter placed around a boring mandrel attached to the operating rod of a jack is downwardly displaced only at the end of travel of the jack, driven into the ground with the boring mandrel and forms a cylindrical recess around the upper end of the bore-hole. The portion of soil which is trapped between the cylindrical cutter and the boring mandrel is removed automatically after simultaneous withdrawal of mandrel and cutter. A post can be driven into the bore-hole, cement or concrete being then poured into the cylindrical recess.

REFERENCES:
patent: 3703212 (1972-11-01), Abrahams
patent: 3817337 (1974-06-01), Panak
patent: 4069774 (1978-01-01), Lofgen
patent: 4105081 (1978-08-01), Perrand

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