Device for drilling a square hole

Details Device for drilling a square hole Device for drilling a square hole

1994-04-01

1996-07-23

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Combined cutting means

Including plunging cutter

144 78, B23B 5108

Patent

active

055383700

ABSTRACT:
A tool is disclosed herein for drilling a square hole in a workpiece adapted to be mounted in the chuck jaws of a drill press. The tool includes a drive shaft having an enlarged spindle provided midway between its opposite ends. One shaft end releasably engages with the chuck jaws while the opposite end includes a threaded bore. A stationary body rotatably receives the shaft and spindle via a pair of spaced roller thrust bearings and a sleeve bushing. A flat drill downwardly depends from the drive shaft threaded bore and terminates in a spade cutting edge. A hollow square chisel is secured to the body and encloses the flat drill. The flat drill bores a circular or round hole in the workpiece while the square chisel forms the corners of a square hole.

REFERENCES:
patent: 159456 (1875-02-01), Rydbeck
patent: 2439558 (1948-04-01), Brown
patent: 2996090 (1961-08-01), Smith
patent: 5297903 (1994-03-01), Hilton

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