Multi-stepped power drill bit having handle chuck adaptor

Details Multi-stepped power drill bit having handle chuck adaptor Multi-stepped power drill bit having handle chuck adaptor

1994-10-24

1995-11-14

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

408226, B23B 5102

Patent

active

054661005

ABSTRACT:
A power drill bit having a stepped construction, referred to as a cone drill, and a quick change capability provided by a shank having a non-circular cross-section and a circumferential groove for quick connect-disconnect in a power tool or drill. The preferred embodiment includes a hexagonal shank which is at least one-half of the axial length of the drill bit in order to provide a better engagement to the power chuck.

REFERENCES:
patent: 3758222 (1973-09-01), Oakes
patent: 4184692 (1980-01-01), Benson et al.
patent: 4582458 (1986-04-01), Korb et al.
patent: 4692073 (1987-09-01), Martindell
patent: 4858939 (1989-08-01), Riggs
patent: 5013194 (1991-05-01), Wienhold

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