Apparatus for cutting a hole

Details Apparatus for cutting a hole Apparatus for cutting a hole

1993-11-15

1995-10-17

Howell, Daniel W.

Cutting by use of rotating axially moving tool

With work-engaging structure other than tool or tool-support

Frictionally engaging sides of opening in work

408206, 408225, B23B 5100

Patent

active

054584442

ABSTRACT:
Apparatus for cutting a smooth concentric hole in a metal workpiece. The apparatus fits in a standard industrial drill chuck and has a pilot drill and tap at one end which drills and taps a pilot hole seating a mandrel on the metal workpiece. When the mandrel is seated, a cam plate and spring arrangement automatically advances the cutting teeth and provides the proper pressure on the cuttering teeth to cut the hole. The cutting teeth have a special anti-breakthrough portion which provides controlled drilling of a smooth hole. A clutch is provided which controls the torque delivered to the apparatus and allows the cam plate to function properly. The device may be adapted easily to accommodate various hole sizes by changing its faceplate.

REFERENCES:
patent: 2306807 (1942-12-01), Halvey et al.
patent: 2435648 (1948-02-01), Frevel
patent: 2777341 (1957-01-01), Marchant
patent: 4127355 (1978-11-01), Oakes

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