Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – And means to apply stress to preform and uniting in stressed...
Patent
1979-04-05
1980-12-23
Pavelko, Thomas P.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
And means to apply stress to preform and uniting in stressed...
B28B 2304
Patent
active
042407761
ABSTRACT:
An apparatus for prestressing reinforcing tendons in concrete products comprising means for supplying continuous tendons over an elongated mould bed. Primary anchoring means grip and stress the tendons while permitting placement of one of a series of moulds. Secondary anchoring means are fixed to means for advancing the moulds along the bed to permit transferring of the grip on the tendons between the primary and secondary anchoring means or vice versa to maintain the prestressing force.
REFERENCES:
patent: 2607099 (1952-08-01), Schroder
patent: 2745164 (1956-05-01), Ros
patent: 3903222 (1975-09-01), Brown
Pavelko Thomas P.
Universal Development Company Ltd.
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