Method and apparatus for drilling hard material

Details Method and apparatus for drilling hard material Method and apparatus for drilling hard material

1984-03-12

1987-07-28

Leppink, James A.

Mining or in situ disintegration of hard material

Processes

299 69, 299 76, E21C 2500, E21C 4100

Patent

active

046828192

ABSTRACT:
A method for drilling a hole in a hard material such as rock. According to this method, the rock is fragmented by impact along spaced-apart, parallel paths while it is simultaneous fragmented by shear between these paths. An apparatus for carrying out this method is also disclosed.

REFERENCES:
patent: 1032049 (1912-07-01), Ebbley
patent: 1059188 (1913-04-01), McKinnon
patent: 1357510 (1920-11-01), Pedulla
patent: 2792205 (1957-05-01), Hagenbook
patent: 3090983 (1963-05-01), Modrak et al.
patent: 3314722 (1967-04-01), Webster
patent: 3887236 (1975-06-01), Patrick
patent: 3981540 (1976-09-01), Hawkes
patent: 4025116 (1977-05-01), Roepke et al.
patent: 4410053 (1983-10-01), Masse
"Cowper's Specification", No. 1612-1871, Jun. 1871.

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