Drilling apparatus with wall-covering protection

Details Drilling apparatus with wall-covering protection Drilling apparatus with wall-covering protection

1984-05-25

1986-08-12

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

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

Having tool-opposing, work-engaging surface

408 72R, 408 97, 408241B, B23B 5100

Patent

active

046053450

ABSTRACT:
A protective device for a fabric or other soft wall covering upon the drilling of a hole therethrough into a support wall behind the covering has a sleeve which closely surrounds the drill bit, a spring braced against the sleeve and a roller bearing to permit immobilization of the sleeve as the drill bit rotates and is axially displaced in the latter. The sleeve has a circular array of pins projecting from its face turned away from the chuck and adapted to penetrate the wall covering. A light supplementary spring can be provided on this side of the sleeve as well to compress the wall covering.

REFERENCES:
patent: 2296087 (1942-09-01), Burns, Jr.
patent: 3192801 (1965-07-01), Gingras
patent: 3620634 (1971-11-01), Sullivan
patent: 4036674 (1977-07-01), Labenz

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