Severing by tearing or breaking – Methods – With preliminary weakening
Patent
1983-04-07
1984-12-11
Yost, Frank T.
Severing by tearing or breaking
Methods
With preliminary weakening
225 935, 225 965, 225105, C03B 3304
Patent
active
044873506
ABSTRACT:
A method and apparatus for cutting pattern shaped holes in glass sheets is disclosed in which a pair of continuous parallel lines are scored on the upper surface of a glass sheet in horizontal orientation so that the outermost score line defines the periphery of the pattern hole. A pair of templates having opening coincidental but smaller than the pattern hole is clamped on both the upper and lower surfaces of the glass sheet so that the outermost score line is located between the clamped plates while the innermost score line is exposed. A force is applied to the exposed area of the glass sheet to remove the glass from the pattern hole. The glass severs at both the inner and outer score lines to produce the pattern shaped hole. Breakout is additionally assisted by thermal gradients introduced in the glass sheet by applying opposing moments to the glass.
REFERENCES:
patent: 3178085 (1965-04-01), Jochim
patent: 3845676 (1974-11-01), Pierce
patent: 4033490 (1977-07-01), Ulivi
patent: 4285451 (1981-08-01), Ferraino
patent: 4297059 (1981-10-01), Miyanaga
patent: 4371103 (1983-02-01), Siemens et al.
Lepiane Donald Carl
PPG Industries Inc.
West William D.
Yost Frank T.
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