Plastic article or earthenware shaping or treating: apparatus – Means to create a vacuum or apply fluid pressure within a...
Patent
1996-09-27
1999-08-03
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Means to create a vacuum or apply fluid pressure within a...
264102, 425432, 425812, B29C 3310, B29C 3942
Patent
active
059322560
ABSTRACT:
A system for placing a vacuum on a container for a cement or molding mixture includes a container for holding the cement which has an opening for adding or removing cement. A flexible polymer film cover is sized to cover at least the open portion of the container and has a vacuum hose coupling attached thereto which connects to a vacuum hose connected to a vacuum pump for drawing a vacuum between the cover and the container. Attaching means, such as a clamping bracket, are provided for removably attaching the flexible polymer cover to the container. A vapor trap is attached in the vacuum line for capturing vapor removed by the vacuum applied to the container. A mold may have a hollow mold core member placed in the center of the mold which has a plurality of apertures therein and which has the uncured cement placed therearound for producing the vacuum in the center of the molded part during the curing of the concrete. The mold may have a vibrator clamp and a vibrator attached thereto for simultaneously vibrating the mold while producing a vacuum to remove gas bubbles from the cement.
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Davis Robert
Hobby III William M.
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