Drill means

Details Drill means Drill means

1997-08-21

1999-08-10

Neuder, William

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Pivoted about substantially longitudinal axis

E21B 1032

Patent

active

059343940

ABSTRACT:
The invention relates to drill means of the type to drill and ream a hole in the ground in advance of a trailing casing tube. Drill means able to drill an oversize hole, and yet allow the drill means to be withdrawn through the casing tube when in place in the hole are known such as in U.S. Pat. No. 3,848,683. Such means are effective but are relatively complex, and the object of the invention is to provide a relatively simple inexpensive drill means capable of drilling an average hole and enabling subsequent extraction through a casing tube. The objective is met by a construction comprising a drill head, drill bit means at the end of the drill head, the drill bit means comprising at least two segments located in corresponding recesses spread equally around the drill head, the segments being rotatably mounted and movable from an inoperative position where they lie within the confines of the outer diameter of the drill head to an operative position where they extend beyond the outer diameter of the drill head, to equal degrees.

REFERENCES:
patent: 4817741 (1989-04-01), Lof
patent: 5139099 (1992-08-01), Hayashi et al.
patent: 5259469 (1993-11-01), Stjernstrom et al.

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