Boring apparatus provided with drill bits freely rotatable aroun

Details Boring apparatus provided with drill bits freely rotatable aroun Boring apparatus provided with drill bits freely rotatable aroun

1974-10-04

1976-03-23

Leppink, James A.

Boring or penetrating the earth

Below-ground mechanical motion converting means relatively...

E21B 308

Patent

active

039454452

ABSTRACT:
A boring apparatus in which a plurality of drill bits are supported in a casing fixed to a boring pipe in such a manner that these bits are axially substantially parallel with the axis of the boring pipe and are freely rotatable around their own axis independently of the rotation of the boring pipe.

REFERENCES:
patent: 1140673 (1915-05-01), Giggey
patent: 1417363 (1922-05-01), Wadsworth
patent: 1551783 (1925-09-01), Baptie
patent: 2563913 (1951-08-01), Binney
patent: 3285351 (1966-11-01), Caro
patent: R25470 (1963-11-01), Allimann

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