Sinkerdrill

Details Sinkerdrill Sinkerdrill

1980-03-26

1981-07-14

Leppink, James A.

Boring or penetrating the earth

With below-ground tool drive prime mover

Below-ground storage of motivating energy

173 78, 173 80, 175 99, 175103, 175106, 299 62, E21B 416

Patent

active

042781361

ABSTRACT:
A down-the-hole rock drill including a drill bit provided at the lower end of a drill rod, which is rotatably driven by an above-the-ground motor. To increase the drilling efficiency and facilitate drilling of large-diameter holes a machine casing is positioned between the drill rod and the drill bit, said casing enclosing a hydraulic pump which is rotatably driven by the drill rod. The hydraulic pump delivers pressurized liquid to and drives the percussion unit including a hammer, the latter delivering blows against the drill bit at regular intervals. The machine casing also encloses at least one hydraulic motor driven by the pressurized liquid and arranged to rotate the drill bit. Hydraulically controllable blocking means prevent the machine casing from rotating relative to the drill hole wall while the drill bit is in operation.

REFERENCES:
patent: 1287477 (1918-12-01), Simpson
patent: 2643860 (1953-06-01), Koch
patent: 3194329 (1965-07-01), Wallers
patent: 3225843 (1965-12-01), Ortloff et al.
patent: 3596722 (1971-08-01), Allard

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