Apparatus for moulding hydraulic cement or the like material

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

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Details

425217, 425405R, 425812, 425DIG60, 249141, 425559, B28B 1302, B29F 100

Patent

active

040593762

ABSTRACT:
Hydraulic cement or the like is poured into a closed mould under a reduced pressure condition to a level slightly higher than a predetermined level. Coarse aggregate and steel rods are prepacked in the mould. After pouring, the pressure in the mould is increased to atmospheric pressure or a higher pressure to force the hydraulic cement above the predetermined level back into the space below the level thus compacting the poured in hydraulic cement. A cushion device is provided for the pouring device. An overflow tank is connected to the mould to observe the level of the poured cement. The pressure in the overflow tank is also decreased during pouring and increased after pouring.

REFERENCES:
patent: 2524419 (1950-10-01), Billner
patent: 2528643 (1950-11-01), Dubbs
patent: 2730783 (1956-01-01), Kennison
patent: 3234598 (1966-02-01), Quinn
patent: 3267517 (1966-08-01), Altermatt
patent: 3357057 (1967-12-01), Bricy
patent: 3561061 (1971-02-01), Bricy
patent: 3663148 (1972-05-01), Walker et al.
patent: 3832107 (1974-08-01), Cox et al.

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