Rock drill with conveying groove

Details Rock drill with conveying groove Rock drill with conveying groove

1994-11-14

1996-01-30

Tsay, Frank S.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

175394, F21B 1044

Patent

active

054874343

ABSTRACT:
An axially elongated rock drill has a chucking shank section (1) at one end and a drilling tip (2) at the opposite end, helically arranged first grooves (3, 4) are located in the outside surface of the drill and extend from adjacent the drilling tip towards the chucking shank section. Helically arranged lands (R) are located between the first grooves and form the outside surface of the drill. The lands have helically arranged auxiliary second grooves located between helically arranged guidance regions (7, 8, 9, 10). Accordingly, the second grooves are spaced from the first grooves by the guidance regions. The width (BH) of the first grooves (3, 4) is approximately twice the total width (BG) of the lands, that is, the width of the two guidance regions and one second groove.

REFERENCES:
patent: 3085639 (1963-04-01), Fitch
patent: 3372763 (1966-06-01), Fischer
patent: 3469643 (1969-09-01), Horst
patent: 4210215 (1980-07-01), Peetz et al
patent: 4503920 (1985-03-01), Clement
patent: 4883135 (1989-11-01), Moser et al
patent: 4942931 (1990-07-01), Moser et al
patent: 4951761 (1990-08-01), Peetz et al
patent: 4967855 (1990-11-01), Moser
patent: 5403130 (1995-04-01), Moser et al

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