Expansible mold for the manufacture of plaster pieces

Details Expansible mold for the manufacture of plaster pieces Expansible mold for the manufacture of plaster pieces

1975-01-30

1976-08-17

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Means to create a vacuum or apply fluid pressure within a...

249127, 249101, 249102, B29C 300

Patent

active

039751317

ABSTRACT:
An expansible mold for the fabrication of plaster parts having reliefs in the side walls comprising at least two walls and non-compressible deformable parts between two parallel side edges of the walls in which, under pressure, the deformable parts acquire the profile to be imparted to the molded plaster part, and which retract from the molded plaster part upon release of pressure to enable removal of the molded part without loss of a tight sealing relation with the mold.

REFERENCES:
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patent: 2558823 (1951-07-01), Crowley et al.
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patent: 3467354 (1969-09-01), Graham
patent: 3500513 (1970-03-01), Stanley
patent: 3529321 (1970-09-01), Culand
patent: 3593373 (1971-07-01), Loomis
patent: 3733159 (1973-05-01), Coffman

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