Apparatus for rock drill

Details Apparatus for rock drill Apparatus for rock drill

1988-08-24

1989-11-28

Dang, Hoang C.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

175394, 408230, E21B 1722

Patent

active

048831352

ABSTRACT:
A rock drill for rotary and percussive stressing exhibits equally good or improved transport characteristics of driling dust for a smaller transport groove as compared with prior rock drills. In order to achieve this, a main transport groove having longitudinal profiles is formed, with an interrupted secondary transport groove integrated in the main transport groove, the transport ribs of which exhibit a greater angle of twist than the angle of twist of the main transport groove.

REFERENCES:
patent: 1209058 (1916-12-01), Smith
patent: 2322894 (1943-06-01), Stevens
patent: 2728558 (1955-12-01), Tengberg
patent: 3011367 (1961-12-01), Tilden
patent: 3147646 (1964-09-01), Rawcliffe
patent: 3360960 (1968-01-01), Massey
patent: 3485052 (1969-12-01), Turzillo
patent: 4143723 (1979-03-01), Schmotzer
patent: 4507028 (1985-03-01), Matsushita
DIN20377, 7-1979.
DIN488, 6-1986, Teil 2.
DIN488, 6-1986, Teil 3.

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