Method and apparatus for drilling hard material

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

E - Fixed Constructions

21

C

262/76

E21C 25/06 (2006.01) E21D 9/10 (2006.01)

Patent

CA 1231729

ABSTRACT OF THE DISCLOSURE: A method for drilling a hole in a hard material such as rock. According to this method, the rock is frag- mented 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.

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