Helical drill

Details Helical drill Helical drill

1994-11-14

1996-04-02

Dang, Hoang C.

Boring or penetrating the earth

With tool shaft detail

Helix or helically arranged structure

175394, 408230, E21B 1044, E21B 1722

Patent

active

055032370

ABSTRACT:
A rock drill is formed of an axially extending shank (2) with a drill head (1) at one end and chuck end (3) at the other end. The axially extending outside surface of the shank has at least one helically extending conveying groove (4, 5) and at least one helically extending land (6, 7). The land (6, 7) forms the radially outer surface of the shank (2). Grooves (8, 9) extending perpendicularly of the shank axis are formed in the surface of the land.

REFERENCES:
patent: 1307525 (1919-06-01), Trebert
patent: 1955768 (1934-04-01), Powell
patent: 3147646 (1964-09-01), Rawcliffe, Jr.
patent: 3667857 (1972-06-01), Shaner et al.
patent: 4285618 (1981-08-01), Shanley, Jr.
patent: 4953642 (1990-09-01), Skaggs

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