Drill bit for the rotary-percussive drilling of preferably rock,

Details Drill bit for the rotary-percussive drilling of preferably rock, Drill bit for the rotary-percussive drilling of preferably rock,

1996-03-04

1998-08-11

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175404, 175405, 175415, E21B 1004, E21B 1044

Patent

active

057914249

ABSTRACT:
A drill bit is proposed, in particular for the rotary-percussive drilling of preferably rock, concrete or the like, which includes a thin-walled cylindrical drilling body (106) open to the drilling side and a drill-bit base (20) extending essentially radially and having an axially arranged drill-bit shank (101) for fastening the drill bit. The drill-bit base (20) has an outer contour in the radial direction, which outer contour follows a curve shape which has at least one inflection point. Furthermore, a drill bit is proposed whose drill-bit base (20) has an outer contour which passes through a minimum in the radial direction, the drill-bit base being connected in the rising radially outer curve section of its outer contour to the cylindrical drilling body. Further independent features of the drill bit according to the invention are at least one prominence (19) on the inside of the drill-bit base for crushing the material to be drilled, which prominence (19) projects from the contour of the inside, or a cuttings-discharge flute (109) having a variable helix angle on the outer contour of the drilling body (106).

REFERENCES:
patent: 1559680 (1925-11-01), Denne
patent: 1572386 (1926-02-01), Gates
patent: 3055443 (1962-09-01), Edwards
patent: 3127944 (1964-04-01), Davis
patent: 3845830 (1974-11-01), Fowler et al.
patent: 5015128 (1991-05-01), Ross, Jr. et al.
patent: 5213456 (1993-05-01), Lee

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