Pneumatic hammer drill

Details Pneumatic hammer drill Pneumatic hammer drill

B - Operations, Transporting

25

D

121/31

B25D 9/04 (2006.01) E21C 1/12 (1980.01)

Patent

CA 1071947

ABSTRACT OF THE DISCLOSURE The specification describes a piston and a method of reciprocating the piston in the casing of a pneumatic percussion machine. The method involves providing a chamber at or towards each end of the casing, locating a piston in such casing with a piston face operating in each of such chambers, and introducing compressed air alterna- tively into the chambers to cause reciprocation of the piston in the chambers, the compressed air being introduced to one chamber through a duct formed in the piston and exhausted from the other chamber through a passage extending for part of its length between the casing wall and the piston. ABSTRACT OF THE DISCLOSURE .... . . _,

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