Plastic article or earthenware shaping or treating: apparatus – Female mold including tamping means or means utilizing mold... – Relatively moving female type shaping member and internal...
Patent
1989-02-24
1991-08-20
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold including tamping means or means utilizing mold...
Relatively moving female type shaping member and internal...
264 72, 264312, 264333, 425262, 425427, 425429, 425432, 425454, B28B 2126, B28B 2128
Patent
active
050409689
ABSTRACT:
A device for manufacturing concrete parts, particularly concrete pipes, and based on the principle of sinking mold whereby a molding bottom ring together with a jacket are continuously lowered relative to a stationary mold core while concrete mixture is poured from above and distributed into the emerging molding space by a radial pressing device mounted on the top end of the mold core. Simultaneously with the lowering of the mold jacket and the molding bottom ring a supply device for delivering the concrete material is also lowered such as to keep a constant distance from the open top end of the mold jacekt. The radial pressing device is designed to compact the incoming concrete material in radial direction without imparting any torque thereto. In this manner any stress in the finished part, particularly between the concrete and reinforcing wire mesh is effectively avoided.
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Georg Prinzing GmbH & Co. KG
Mackey James P.
Striker Michael J.
Woo Jay H.
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