Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1974-12-16
1976-08-03
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
264315, 425 38, B29C 700, B29H 502
Patent
active
039729788
ABSTRACT:
A method for discharging a cured tire from a mold in which method the lower sidewall of the tire is disengaged from the lower section of the mold by raising the tire with respect to the position in which it had been cured while maintaining the sections of the mold at its tread and upper sidewall in contact with the tire, then disengaging the section at its tread by moving said section radially outwardly while simultaneously pushing the tire and section at its upper sidewall downward to a level lower than that corresponding to the lower surface of the section of the mold for the tire's tread, displacing the section for the tire tread inwardly until its diameter is less than the outer diameter of the tire and finally raising the tire and the upper section for the upper sidewall until the tire is disengaged from the upper sidewall section. The molding apparatus is constituted by at least one upper and one lower mold section for the sidewall of the tire and an intermediate section for the tread, pistons and ledger for moving the upper and intermediate sections with respect to the lower section, together or independently, lateral guides to displace the intermediate section in a radially inward or outward direction, a membrane for insertion in the tire, a screw with opposing threads having nuts thereon to which are attached the ends of the membrane and permit the membrane to move into and out of contact with the interior of the tire and a conduit in communication with the interior of the tire to permit entry and exit of compressible fluid.
REFERENCES:
patent: 2778060 (1957-01-01), Brundage
patent: 3550196 (1970-12-01), Gazuit
Industrie Pirelli S.p.A.
Silbaugh Jan H.
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