Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to evacuate mold or provide controlled environment
Patent
1993-06-11
1994-12-06
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to evacuate mold or provide controlled environment
13762526, 13762568, 251297, 425562, 425DIG60, B29C 4523
Patent
active
053705220
ABSTRACT:
An injection valve for a vacuum wax injection installation for selectively communicating a mold into which wax is to be injected with a chamber with a vacuum and a chamber with liquid wax in the vacuum wax injection installation includes a main valve body and a tubular member which is arranged slidably in the main valve body between a valve-closed position, an evacuation position and a wax injection position. One end of the tubular member carries a connecting element against which the mold can be pressed while the opposite end of the tubular member is closed. The tubular member has lateral openings providing a communication between the connecting element and first the vacuum chamber and then the wax-filled chamber as the tubular member is progressively pushed into the main valve body from the valve-closed position, whereby firstly the mold is evacuated and then wax is injected into the mold.
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Davis Robert B.
Woo Jay H.
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