Multiple chamber vacuum holder used to shape glass sheets...

Details Multiple chamber vacuum holder used to shape glass sheets... Multiple chamber vacuum holder used to shape glass sheets...

C - Chemistry, Metallurgy

03

B

49/22

C03B 23/035 (2006.01) B29C 51/10 (2006.01)

Patent

CA 1199793

Abstract Multiple chamber vacuum holders for use in shaping sheets of glass or other heat-softenable material to complex shapes require a dif- ferent level of vacuum in adjacent vacuum chambers. A porous fiber glass cover used with such vacuum holders provide passages for residual air in adjacent passages to tend to equalize when a sheet is held against the porous cover. The present invention helps maintain a difference in level of vacuum between adjacent vacuum chambers by interposing a narrow space vented to atmosphere between adjacent vacuum chambers of the multiple chamber vacuum holder.

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