Purses – wallets – and protective covers – Protective cover made of flaccid material – For a racquet
Patent
1975-09-10
1977-07-19
Van Horn, Charles E.
Purses, wallets, and protective covers
Protective cover made of flaccid material
For a racquet
156 96, 156394, 264326, B29H 1736
Patent
active
040362710
ABSTRACT:
A retread envelope press, seamless retread envelope, and method for manufacturing said seamless retread envelope are described as facilitating the production of superior retreaded or recapped tires. In particular, a seamless elastomeric compression-formed envelope is described which is formed and cured in a configuration having a U-shaped radial cross section. The envelope of the present invention also has a rip-resistant bead disposed along its peripheral edges. In manufacturing the envelope, an uncured chloro-butyl rubber slug of appropriate volume is placed in an annular compression chamber defined between two platens. As the platens are moved from a first feed position to a second forming position, the volume of the compression chamber is reduced and the elastomeric slug material is forced around a radially symmetrical core. When the platens reach the forming position, the radially symmetrical core and the platens define therebetween a molding void which is then completely filled with uncured elastomeric material. Compressive forces on the order of from 300 to 600 tons are employed, not only during the above described forming process, but also during a subsequent curing process during which the envelope is heated to a temperature of between 250.degree. and 365.degree. F., said heating being accomplished by introducing steam into a void defined within said core. A seamless retread envelope is produced by this process which is durable and which enables the production of a superior quality retread.
REFERENCES:
patent: 2497226 (1950-02-01), McNeill
patent: 2615203 (1952-10-01), DuPree
patent: 2976910 (1961-03-01), Nowak
patent: 3236709 (1966-02-01), Carver
patent: 3745084 (1973-07-01), Schelkmann
patent: 3752726 (1973-08-01), Barefoot
patent: 3846201 (1974-11-01), Huskins
patent: 3849220 (1974-11-01), Suzuki et al.
patent: 3884739 (1975-05-01), Hindin et al.
patent: 3909337 (1975-09-01), Yabe
Kittle John E.
Van Horn Charles E.
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