Drills

Details Drills Drills

1996-01-22

1998-08-25

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

408180, 408224, 82 12, B23B 29034

Patent

active

057977097

ABSTRACT:
An expansible drill is provided for drilling and undercutting holes. The drill comprises a rotatable tubular drill body having a drill head at one end for cutting a bore. At least one undercutting arm is located within a slot in the drill body and attached by a hinge such that at least a part of the arm is pivotal radially outwards. A guide is provided for moving the arm radially outwards, the guide comprising a shaft which is located within the drill body and constrained to rotate therewith. A locking mechanism selectively prevents or allows the shaft to move axially relative to the drill body as force is applied to an end of the shaft.

REFERENCES:
patent: 1331138 (1920-02-01), Baldwin
patent: 1645602 (1927-10-01), Lewis
patent: 2236944 (1941-04-01), Gerardi
patent: 2401074 (1946-05-01), Huelster
patent: 4307636 (1981-12-01), Lacey
patent: 4411324 (1983-10-01), Liebig
patent: 4992010 (1991-02-01), Fischer
patent: 4998981 (1991-03-01), Miyanaga

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