Apparatus for forming holes in plate glass

Cutting by use of rotating axially moving tool – Tool or tool with support – With work-engaging structure detachable from cutting edge

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Details

125 20, 408204, 408225, B23B 5104

Patent

active

042970598

ABSTRACT:
This disclosure relates to apparatus and method of forming circular holes in plate glass. A circular cut is made in the glass to a predetermined depth, which is less than the thickness of the glass by approximately 0.5 to 1.0 mm. After this cut has been made, the cutting apparatus is removed and the glass is softly struck adjacent to the circular cut in order to break loose the glass disc enclosed by the cut. The edge or margin of the hole may then be smoothed by grinding or polishing. The glass cutting apparatus includes a circular saw or glass cutter which is rotated to cut the glass. A stopper of the apparatus is adjustably mounted adjacent the cutting edge of the saw and stops the saw from cutting further after a predetermined depth has been reached. The position of the stopper may be adjusted for different thicknesses of glass.

REFERENCES:
patent: 58924 (1866-10-01), Webster
patent: 308842 (1884-12-01), Hunt
patent: 484075 (1892-10-01), Wilkie
patent: 1705049 (1929-03-01), Fournier
patent: 2454522 (1948-11-01), Palmer
patent: 3794438 (1974-02-01), Knutsson

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