Hole saw and mandrel assembly

Details Hole saw and mandrel assembly Hole saw and mandrel assembly

1990-05-04

1991-10-29

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

408209, B23B 5105

Patent

active

050611267

ABSTRACT:
A one piece hole saw assembly with mandrel permanently affixed to the hole saw cup. The mandrel contains a hollow shaft, a locking flange and reinforcing flange which are integrally formed as by machining. The locking flange of the mandrel mates with a locking hole or slot in the top surface of the hole saw cup. The reinforcing flange on the mandrel is welded during manufacture to the top surface of the hole saw cup. A pilot drill bit is inserted into the shaft core and welded to the shaft. The resulting product is a one piece hole saw assembly intended for use by simple insertion of the mandrel or shaft end of the pilot drill into the chuck of a conventional electric drill.

REFERENCES:
patent: 2852967 (1958-09-01), Mueller et al.
patent: 3758221 (1973-09-01), Meshulam
patent: 3999869 (1976-12-01), Clark et al.
patent: 4077737 (1978-03-01), Morse
patent: 4148593 (1979-04-01), Clark
patent: 4303357 (1981-12-01), Makar

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