Combination drilling member

Details Combination drilling member Combination drilling member

1998-03-18

2000-06-13

Neuder, William

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175414, 408200, 408713, E21B 1026

Patent

active

060737107

ABSTRACT:
A combination drilling member includes an axially elongated drill, such as used for drilling rock, having an axially extending shaft (2) with a first end leading in the drilling direction containing a cutting bit (3). The shaft (2) has at least one helical drilled material removal groove (4) and an auxiliary element encircling and detachably connected to the shaft (2) intermediate the ends thereof. The auxiliary element (6) has at least one elastic plastic part (9) extending around the shaft and containing a through hole (10) for the shaft where the plastic part is secured to the shaft by at least one of frictional and positive locking engagement against inadvertent axial displacement and held against relative rotation to torques of up to 40 Nm.

REFERENCES:
patent: 2964115 (1960-12-01), Clatfelter
patent: 3138183 (1964-06-01), Stewart
patent: 5078552 (1992-01-01), Albel
patent: 5222842 (1993-06-01), Schweikert et al.

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