Rock drill

Details Rock drill Rock drill

1981-04-13

1984-07-10

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175323, 408226, 408230, E21B 1044

Patent

active

044587694

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 sections from the surface of the shaft decreases in the direction toward the shank.

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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