Plastic and nonmetallic article shaping or treating: processes – With step of cleaning – polishing – or preconditioning...
Patent
1981-06-23
1983-10-11
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
With step of cleaning, polishing, or preconditioning...
264228, 264229, 425111, B28B 704, B28B 2306, B28B 738
Patent
active
044091591
ABSTRACT:
Equipment for the production of pre-stressed concrete beams or railway sleepers includes two, spaced, reinforcement-tensioning, abutment assemblies with a casting bed lying between the assemblies. Mobile moulds can be moved into and out of the casting bed through one of the abutment assemblies and the latter includes a plurality of displaceable arms carrying reinforcement clamping means. Each arm is displaceable to allow passage of the moulds when the latter are filled with at least partially cured pre-stressed concrete articles. A mould train can be removed as a whole with cured articles therein and individual articles formed by severing the tensioning reinforcing bars or wires and the finished articles subsequently demoulded at a site remote from the casting bed.
REFERENCES:
patent: 3084910 (1963-04-01), Allers et al.
patent: 4040775 (1977-08-01), Nordbak
patent: 4051216 (1977-09-01), Bratchell
Anderson Philip E.
Dow Mac Concrete Limited
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