Hydraulic down-the-hole rock drill

Details Hydraulic down-the-hole rock drill Hydraulic down-the-hole rock drill

1985-06-18

1987-04-28

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

173 80, 173136, 91224, E21B 414

Patent

active

046606580

ABSTRACT:
Pressurized water is used to operate a percussive down-the-hole drill and the spent motive fluid is used as a flushing fluid. A rear cylinder chamber (24) is constantly pressurized and a valve (28) controls the inlet from the chamber (24) to a bore (23) through the piston hammer (21). A valve (42) controls the outlet from the front cylinder chamber (26) to a flushing channel (38) in the drill bit (21). A check valve (45) controls the outlet from the bore (23) to the front cylinder chamber (26).

REFERENCES:
patent: 2979033 (1961-04-01), Bassinger
patent: 3084673 (1963-04-01), Sears
patent: 3085555 (1963-04-01), Morrison
patent: 3431984 (1969-03-01), Buehler et al.
patent: 3616868 (1971-11-01), Bassinger
patent: 4450920 (1984-05-01), Krasnoff et al.

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