Multiple chamber vacuum holder used to shape glass sheets with m

Details Multiple chamber vacuum holder used to shape glass sheets with m Multiple chamber vacuum holder used to shape glass sheets with m

1983-05-24

1984-11-20

Kellogg, Arthur

Glass manufacturing

Glassworking or preform by or with reheating means

Planar sheet preform

65104, 65106, 65287, 294 64R, 414121, C03B 23035

Patent

active

044837020

ABSTRACT:
Multiple chamber vacuum holders for use in shaping sheets of glass or other heat-softenable material to complex shapes require a different 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.

REFERENCES:
patent: 4229199 (1980-10-01), Seymour
patent: 4229200 (1980-10-01), Seymour
patent: 4277276 (1981-07-01), Kellar et al.
patent: 4282026 (1981-08-01), McMaster et al.
patent: 4297118 (1981-10-01), Kellar et al.
patent: 4349375 (1982-09-01), Kellar et al.

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