Drills

Details Drills Drills

1991-07-12

1992-05-05

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool-support with means to move tool relative to tool-support

To move radially

82 12, B23B 5100

Patent

active

051102382

ABSTRACT:
The invention relates to improvements in drills for undercutting holes and in particular to expansible drills. The drill according to the invention comprises a rotatable tubular drill body having an axial bore, at least one radially extending arm attached by hinge means at one end to the drill body such that the arm is pivotal radially outwards, cutting means formed in the arm, guide means for moving the arm radially outwards, said guide means comprising a non-rotating shaft, and means for moving the shaft axially relative to the drill body towards said one end, so as to cause the arm to pivot radially outwards.

REFERENCES:
patent: 729647 (1903-06-01), Nutting
patent: 1511898 (1924-10-01), Makay
patent: 2236944 (1941-04-01), Gerardi
patent: 2541537 (1951-02-01), Newcomb
patent: 2940367 (1960-06-01), Cogsdill
patent: 3815694 (1974-06-01), Giustino
patent: 4498820 (1985-02-01), Brennan
patent: 4847961 (1989-07-01), Donovan et al.

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