Combination impact and pressure liquid rock drill

Details Combination impact and pressure liquid rock drill Combination impact and pressure liquid rock drill

1979-10-19

1981-09-22

Leppink, James A.

Boring or penetrating the earth

With tool shaft detail

Axially telescoping shaft section

173 76, E21B 106

Patent

active

042904960

ABSTRACT:
A conventional type of impact rock drill is modified to include a fluid reservoir, valve and piston arrangement whereby each impact stroke of the driver ejects water at high pressure from the cutter bit, thereby increasing the mechanical cutting through hydraulic action of a small volume of high pressure jet of water.

REFERENCES:
patent: 1029102 (1912-06-01), Cazin
patent: 1698343 (1929-01-01), Mortimer et al.

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