Four square corner hole saw

Cutlery – Implements adapted to be driven by detachable portable...

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Details

30369, 305035, 144363, 83618, B27B 1900

Patent

active

058679138

ABSTRACT:
My interest was aroused by the lack of any power tool to help the electrical contractor cutting rectangular holes through walls for his wall boxes for switches and receptacles. I started making a model in 1992 only to find out there was no parameters to follow for the specifications the thrust needed. To push four saw blades were one problem to solve. The fact that the unit would require a rigid attachment to the wall was another problem to solve. The small rectangular hole gave little room to work. The last problem to solve was about 12 inches of simultaneously sawing. By Thanksgiving time of 1996 my fourth model was finished. I had the surprise to discover that I was able to saw a rectangular hole of two inches by four inches in 1/2 inch plasterboard in about ten seconds and in plywood, less than one minute|
This could be an excellent item for the mobile home builder to cut the holes in the walls. He would welcome this saw.
The housing contractor and his electrician, I believe, will have to resort to simple wooden gauges to accurately locate boxes in the studding exactly and this saw, I propose to use height rods and a horizontal type gauge to find that box behind the wall.
When this device is accepted and patented, it will be my seventeenth patent (I worked for Delta MFG. in Mtailwaukee, Wis., until 1952, and Rockwell in Pittsburgh, Pa., until 1971). I have been in retirement since 1977.

REFERENCES:
patent: 3302674 (1967-02-01), Russell
patent: 3503294 (1970-03-01), Vinciguerra et al.
patent: 3713217 (1973-01-01), Frederick et al.
patent: 5031324 (1991-07-01), Berghauser et al.

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