Drill bit

Details Drill bit Drill bit

2005-11-01

2005-11-01

Walker, Zakiya (Department: 3672)

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

C175S415000, C175S427000, C175S435000

Reexamination Certificate

active

06959775

ABSTRACT:
A drill comprising a shank part (11), which is adapted to be received in a drill holder of a drilling machine, and an opposite cutting end part (13). An intermediate fluted part (12) is provided, which defines at least one helical flute or channel (16) having a bottom surface (19) and a pair of opposite side surfaces (20) defined by the ribs or lands (17). The shape of a cross-section of the at least one flute or channel, taken at right angles to the course of the flute or channel, is such that the distance from a reference plane (24) to the bottom surface or the flute is decreasing from a central part (22) of the bottom surface towards the adjacent side surface (20) of the flute. The reference plane is at right angles to a radial line (25) extending from the longitudinal axis of the drill and through the centre of the bottom surface width. A helically extending groove (21) is formed in the middle of the central part (22) of the bottom surface (19).

REFERENCES:
patent: 6431295 (2002-08-01), Kleine et al.
patent: 0352215 (1990-01-01), None

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