Sound attenuating rock drill shank

Details Sound attenuating rock drill shank Sound attenuating rock drill shank

1981-11-24

1983-07-19

Purser, Ernest R.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

173DIG2, E21B 1722

Patent

active

043939473

ABSTRACT:
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.

REFERENCES:
patent: 3422913 (1969-01-01), Young
patent: 4016944 (1977-04-01), Wohlfeld
patent: 4266830 (1981-05-01), Retka et al.
patent: 4290653 (1981-09-01), Lagowski

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