B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/120
B22C 9/02 (2006.01) B22C 9/03 (2006.01) B22C 9/04 (2006.01)
Patent
CA 1051631
ABSTRACT OF THE DISCLOSURE A casting mold filled with free-flowing particulate matter such as sand, in which there is imbedded a vaporizable pattern of foam plastic conforming to the shape of the desired casting, has at least two of its walls formed by flexible membranes exposed to the atmosphere for creating a more or less isobaric pressure upon the application of suction to its interior. One membrane may span the open top of a four-sided rigid shell whose perforated bottom is overlayed by another such membrane; alternatively, with the sidewalls of the shell also perforated and/or vertically ribbed or fluted, five membranes may be combined into an open-topped bag lining the interior of the shell, the top of the bag being closed by a sixth membrane after introduction of the sand filling and its pattern.
251537
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