Vacuum heat shield

Details Vacuum heat shield Vacuum heat shield

1991-11-26

1993-03-23

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Reshaping, resizing or vulcanizing means for tire, tire...

264326, 264DIG78, 425210, 4254051, 425DIG60, B29C 3300

Patent

active

051962063

ABSTRACT:
A tire mold having relatively reciprocable first and second mold halves is provided with a heat shield which includes first and second relatively reciprocable shield members. One of these shield members is fixedly secured to one of the mold halves; the other shield member is fixedly secured to the other mold half. The shield members are spaced from the mold halves so that they enclose a space which surrounds the mold halves. A vacuum tight seal between the shield members is provided. A nipple which is adapted to be connected to a source of vacuum extends through one of the shield members so that the space enclosed by the shield members can be placed under vacuum, thereby inhibiting heat transfer to the atmosphere surrounding the apparatus. Heat transfer is further inhibited by the thin reflective chrome plate layer on the inside wall surfaces of both heat shield members. Preferably the mold halves are arranged one above the other and each is secured to a platen. One of the mold halves and its associated platen are held in fixed position while the other mold half and its associated platen reciprocate vertically. The shield members are preferably vertical hollow cylinders, one being of slightly larger diameter than the other to afford a small clearance therebetween. A resilient sealing ring (or two such rings) in a groove in one of the shield members engages a cylindrical wall surface of the other shield member to provide a vacuum tight seal.

REFERENCES:
patent: 3640653 (1972-02-01), Laenen et al.
patent: 4185952 (1980-01-01), Hewitt
patent: 4204822 (1980-05-01), Hewitt
patent: 4595553 (1986-06-01), Blayne et al.
patent: 4867924 (1989-09-01), Schilkey et al.
patent: 4957676 (1990-09-01), Greenwood

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