Rock drill having an internal flushing channel

Details Rock drill having an internal flushing channel Rock drill having an internal flushing channel

1998-09-08

2000-08-15

Bagnell, David

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175320, 175415, E21B 1038

Patent

active

061021415

ABSTRACT:
A rock drill for percussive drilling includes a shank, a collar connected to a front end of the shank, and a rod portion which at one end connects to the collar while the other end carries a rock cutting means. A central flush channel extends from the front free end of the shank in a direction towards the front end. The central flush channel has a substantially constant diameter (d) along essentially its entire length; a ratio of the diameter (d) to a smallest outer cross sectional width (D) of the rod portion being in the range of 0.35 to 0.43.

REFERENCES:
patent: 3295613 (1967-01-01), Anderson
patent: 4226290 (1980-10-01), McSweeney
patent: 4852672 (1989-08-01), Behrens

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