Method and apparatus for shaping thermoplastic sheet material
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United States of America Patent
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-
Sep 29, 1981
Grant Date -
N/A
app pub date -
Nov 27, 1979
filing date -
Nov 27, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus are described for bending sheets in the plastic state, such as sheets of glass at their softening temperature, in two directions. The apparatus comprises a first bed of arcuate rods which can be positioned to impart a transverse curvature to the sheet and a second bed of arcuate rods which can be positioned to impart a longitudinal curvature to the sheet. Advantageously the bending is performed in a heated enclosure at a temperature at least equal to that at which the sheet is later tempered.
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