Rock drill

Details Rock drill Rock drill

E - Fixed Constructions

21

B

255/67, 255/68

E21B 10/44 (2006.01) B25D 17/11 (2006.01) E21B 17/00 (2006.01) E21B 17/22 (2006.01)

Patent

CA 1172626

ABSTRACT OF THE DISCLOSURE A rock drill includes a drill shank with a boring head at one end and laterally enclosed for at least a portion of its length by a tubular shell. A helix extends around the outside of the tubular shell for carrying borings away from the boring head. Supporting members formed of a sound attenuating material are located between the helix and the other parts of the rock drill.

389952

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