Extrusion casting apparatus

Details Extrusion casting apparatus Extrusion casting apparatus

1976-09-10

1979-01-09

Taylor, Billy S.

Plastic article or earthenware shaping or treating: apparatus

Building forms or construction engineering type mold with...

Including mold charging means

425114, 425432, B29B 104, B28B 500, B28B 2122

Patent

active

041336194

ABSTRACT:
Apparatus for manufacturing precast, prestressed, hollow-core, concrete slabs, including an extruder which is movable along a fixed casting bed to extrude from a relatively dry concrete mix a slab having longitudinally extending hollow cores and grout keyways extending along the slab sides. Multiple, core-forming augers in the extruder are shaped and positioned with respect to a feed opening in the extruder in a manner which eliminates cavitations in the slab and provides smooth, well formed slab surfaces and proper bonding between the concrete and prestressing wires.

REFERENCES:
patent: 3074107 (1963-01-01), Mase et al.
patent: 3159897 (1964-12-01), Ellis et al.
patent: 3164375 (1965-01-01), Frenkel
patent: 3176371 (1965-04-01), Patchen
patent: 3284867 (1966-11-01), Booth
patent: 3292227 (1966-12-01), Olds
patent: 3602950 (1971-08-01), Bielfeldt
patent: 3781154 (1973-12-01), Herbert
patent: 3877860 (1975-04-01), Putti

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