Rock drill

Details Rock drill Rock drill

1984-04-05

1985-10-29

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175323, 408226, 408230, E21B 1044

Patent

active

045496161

ABSTRACT:
A rock drill is formed of an axially elongated member made up of a cutting bit at one end followed by a helically grooved shaft and then ending in a shank. At least a portion of the groove, viewed in the axial direction of the member, has a stepped bottom providing groove sections of different depths. The depth of the groove section from the surface of the shaft decreases in the direction toward the shank. The groove sections with stepped bottom commence at a certain axial length from the cutting bit.

REFERENCES:
patent: 1216628 (1917-02-01), Teasck
patent: 3045513 (1962-07-01), Andreason
patent: 3749189 (1973-07-01), Boehm
patent: 4091693 (1978-05-01), Straub

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