Means for drilling

Details Means for drilling Means for drilling

1978-04-24

1983-10-11

Leppink, James A.

Boring or penetrating the earth

Tool removable or insertable through or around driving or...

Laterally shiftable cutter element movable through shaft

175100, 175171, 175323, E21B 1026, E21B 102

Patent

active

044086695

ABSTRACT:
Drilling means of the type having a pilot bit, a reamer and a guidemember mounted in the bottom end of the casing tube, and which transmits impacts to the casing. The guide member is snugly enclosed in the thickened mouth portion of the casing tube and has a plurality of channels which are segments of a spiral through which the drilling debris is discharged upwardly to the casing tube.

REFERENCES:
patent: 2250671 (1941-07-01), Joy
patent: 3682260 (1972-08-01), Klemm
patent: 3848683 (1974-11-01), Persson
patent: 3870114 (1975-03-01), Pulk
patent: 4091884 (1978-05-01), Thomas

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