B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
25/58
B28B 1/10 (2006.01) B28B 1/08 (2006.01) B28B 7/18 (2006.01) B28B 7/28 (2006.01)
Patent
CA 1264108
ABSTRACT OF THE DISCLOSURE A method and device for the casting of concrete products having one or several cavities, involves passing a concrete mix around a cross-sectionally lobed cavity mandrel to form the cavities. The concrete mix is compacted by rotating the cavity mandrel back and forth around its longitudinal axis. The method may apply to a periodic or continuous slide casting method of production, and, by means of the non-circular cross section of the cavity mandrel, allows better compaction of the concrete mix below and between mandrels. Prior compacting systems either failed to address the problem of non-compaction beneath the mandrel or attempted to solve it by recourse to noisy and thus undesirable vibrators.
479853
Oy Partek Ab
Robic Robic & Associes/associates
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