Hammer drills for making boreholes

Details Hammer drills for making boreholes Hammer drills for making boreholes

E - Fixed Constructions

21

B

255/13

E21B 4/14 (2006.01) E21B 10/38 (2006.01) E21B 21/12 (2006.01) E21B 21/16 (2006.01)

Patent

CA 1328252

ABSTRACT A valveless-type down-the-hole hammer drill which has an inner tube extending from the upper end of the hammer body into a central opening in a cutter bit reciprocably mounted in a chuck on the opposite end of the hammer body. High pressure fluid is supplied to the interior of the inner tube and a piston surrounding the inner tube has internal surfaces controlling connection of a port to chambers above and below the piston. The external surface of the piston controls connection of these chambers to an exhaust port A valve sleeve on the chuck coacts with the piston in this respect.

564926

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