Drill attachment

Details Drill attachment Drill attachment

1976-11-02

1977-08-23

Simpson, Othell M.

Cutting by use of rotating axially moving tool

Tool or tool with support

With work-engaging structure detachable from cutting edge

145116R, 408 82, 408241R, B23B 5100

Patent

active

040436985

ABSTRACT:
A follower is provided for a conventional flat drill bit which adapts the drill bit to provide a diametrally enlarged bore. The follower generally comprises a cylindrical section having a diametral slot therein in which the blade end of the bit is received. The well-bottom of the diametral slot includes a tapered socket in which the nose of the bit is received, the nose of the bit extending beyond the bottom wall of the cylindrical section. A means is provided for releasably mounting the follower on the drill bit. A bore in the work piece to be drilled is initiated by the nose of the bit extending through the follower thereon. As the nose penetrates into the work piece, the follower diametrally enlarges the bore provided thereby.

REFERENCES:
patent: 413316 (1889-10-01), Dobson

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