Vacuum holder with anti-bulging means used to shape glass sheets
First Claim
Patent Images
1. A vacuum holder for holding sheets of heat softened material thereagainst comprising:
- an upper sheet wall;
a lower apertured sheet wall with at least one longitudinal slit extending from a generally transversely extending portion of said apertured sheet wall to an edge portion of said apertured sheet wall, forming side by side elongated strips, to allow transverse expansion of said lower apertured sheet wall upon exposure to said sheet at softening temperature without distorting transversely to a shape beyond desired tolerances;
spacer wall means spacing said walls from one another;
means to secure said upper sheet wall, said lower apertured sheet wall, and said spacer wall means together to form a chamber therebetween so that said lower apertured sheet wall is free to expand longitudinally without distorting to a shape beyond desired tolerances; and
means adapted to communicate said chamber with a vacuum source.
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Accused Products
Abstract
A vacuum holder for holding sheets of heat-softenable material such as glass thereagainst by vacuum during their fabrication into shaped sheets comprising a lower sheet wall that has flanking portions slit longitudinally to provide strips extending longitudinally from a central portion, the width of the strips being limited to limit transverse bulging as the holder becomes hot during a sheet shaping campaign. Longitudinal slots of increasing length from a selected transverse line, preferably one traversing the geometric center of the sheet, control longitudinal bulging of the holder.
30 Citations
18 Claims
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1. A vacuum holder for holding sheets of heat softened material thereagainst comprising:
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an upper sheet wall; a lower apertured sheet wall with at least one longitudinal slit extending from a generally transversely extending portion of said apertured sheet wall to an edge portion of said apertured sheet wall, forming side by side elongated strips, to allow transverse expansion of said lower apertured sheet wall upon exposure to said sheet at softening temperature without distorting transversely to a shape beyond desired tolerances; spacer wall means spacing said walls from one another; means to secure said upper sheet wall, said lower apertured sheet wall, and said spacer wall means together to form a chamber therebetween so that said lower apertured sheet wall is free to expand longitudinally without distorting to a shape beyond desired tolerances; and means adapted to communicate said chamber with a vacuum source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification