Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1978-09-18
1980-04-15
Flint, Jr., J. Howard
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
425 47, 425 56, 425542, 425577, 425589, B29H 502, B29F 100
Patent
active
041983726
ABSTRACT:
A process is provided for injection molding a vehicle tire such as the one disclosed in U.S. Pat. No. 3,805,868 having a bead of elastomeric material. The mold has an outer envelope and an inner body having a core formed of radially collapsible sectors which combine to enclose a mold cavity. The inner body member has at least two annular elements, an upper and lower one, which are separable from one another and from the core along the direction of the core axis. The annular elements have surfaces which form axially inner surfaces of the tire's beads. The inner body member is also provided with members for blocking the annular elements with the core and with the envelope. The core of the mold is divided into two series of alternate collapsible sectors which are displaced radially inwardly when the tire is released from the mold.
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patent: 868732 (1907-10-01), Vincent
patent: 1101732 (1914-06-01), Doughty
patent: 1388255 (1921-08-01), Hardeman
patent: 3123122 (1964-03-01), Beckadolph
patent: 3459849 (1969-08-01), De Ronde
patent: 3645655 (1972-02-01), Beneze
patent: 3994650 (1976-11-01), Nishumira et al.
patent: 4137033 (1979-01-01), Goodfellow
Flint, Jr. J. Howard
Industrie Pirelli S.p.A.
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