Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Plural sequential shaping or molding steps on same workpiece
Patent
1981-10-06
1986-06-24
Czaja, Donald
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Plural sequential shaping or molding steps on same workpiece
264 71, 264293, 264294, 2642975, 264323, B29C 5900, B29C 4302
Patent
active
045966869
ABSTRACT:
A method for adjusting the tolerances, regarding shape and dimensions, of an elongated vibrated concrete article made in a mould after removing the article from the mould. The invention makes it possible to achieve close tolerances inspite of using a rather wet concrete composition, which is optimized as regards strength but which causes adhering and suction in the mould and alteration of the articles shape before hardening. According to the invention, the method is characterized in that the article, before hardening, is brought into engagement with one long side a straight-edge rule for being shaped thereby, in that the article on the end surfaces is pressed to a predetermined length, and in that the cross sectional shape of the article is adjusted into agreement with the desired shape while keeping the article in engagement with the rule and pressing it on the end surfaces.
REFERENCES:
patent: 3557266 (1971-01-01), Chiba
patent: 4083908 (1978-04-01), Kolvinis
patent: 4175106 (1979-11-01), Clarke
Br. Perssons Cementvarufabrik AB
Czaja Donald
Lorin Hubert C.
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