Rock drill

Details Rock drill Rock drill

1976-12-09

1978-09-12

Purser, Ernest R.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

175211, 175320, E21B 2100

Patent

active

041130375

ABSTRACT:
A rock drill comprises a shaft having a leading and a trailing end, a shank connected to the trailing end, and a drill head connected to the leading end of the shaft. Means for transporting drilling from the leading end toward the trailing end of the shaft are provided which include at least one channel extending parallel to the shaft from the drill head toward the shank. A shell coaxially surrounds the shaft and bounds the channel, which shell has an open front end adjacent the drill head, a closed rear end facing the shank and at least one transverse bore adjacent the rear end of the shaft and open at the outer surface of the shell.

REFERENCES:
patent: 1109782 (1914-09-01), Purcell
patent: 2879035 (1959-03-01), Tilden
patent: 3162255 (1964-12-01), McCarty
patent: 3422913 (1969-01-01), Young
patent: 3655001 (1972-04-01), Hoffman
patent: 3735824 (1973-05-01), Astrom

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