Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With coupling between charger and mold
Patent
1987-04-13
1989-01-03
Hoag, Willard
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With coupling between charger and mold
249 65, 249122, 425417, B29C 4527
Patent
active
047953292
ABSTRACT:
A viscoelastic fluid molding material (50) is injected into a tire tread cavity (32) between the mold (10) and an inflatable tread supporting body (30). The clearance distance (A) between the mold (10) and the inflatable tread supporting body (30) is varied to increase the flow of the initial amount of fluid molding material (50) into remote portions of the tire tread cavity (32) and provide for the flow of the final amount of fluid molding material (50) into gate portions (52) while the tread supporting body (30) is being deflected.
Circumferentially spaced gates (76) may be spaced from the centerplane (20"--20") of the mold (10") and have runners (80) extending toward the shoulders of the tread supporting body (30") for increased flow of the initial amount of fluid molding material (50") into remote shoulder portions (52") of the tread cavity (32"). Sealing rings (56) at the side edges of the tread cavity (32) prevent flow of fluid molding material (50) into sidewall areas (60) of side members (16,18) of the mold (10).
REFERENCES:
patent: 2724425 (1955-11-01), Ostling
patent: 2744290 (1956-05-01), Corson
patent: 4055619 (1977-10-01), Goodfellow
patent: 4059375 (1977-11-01), Koch et al.
patent: 4088523 (1978-05-01), Gallizia et al.
patent: 4166832 (1979-09-01), Gallizia
patent: 4176702 (1979-12-01), Seiberling
patent: 4604256 (1986-08-01), Greenwood et al.
patent: 4655699 (1987-04-01), Collier
Hoag Willard
Lacher Frederick K.
Lewandowski T. P.
The Goodyear Tire & Rubber Company
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