초록 ▼

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 o

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.

대표청구항 ▼

An apparatus comprising: (a) first and second mating mold halves which are reciprocable relative to one another between an open position and a closed position and which when in said closed position are in mating engagement along a parting line and enclose a mold cavity; (b) a first shield member fix

An apparatus comprising: (a) first and second mating mold halves which are reciprocable relative to one another between an open position and a closed position and which when in said closed position are in mating engagement along a parting line and enclose a mold cavity; (b) a first shield member fixedly secured to said first mold half and surrounding said first mold half in spaced relationship; (c) a second shield member fixedly secured to said second mold half and surrounding said second mold half in spaced relationship; said first and second shield members being relatively reciprocable with respect to each other, said first and second shield members together enclosing a space surrounding said mold halves; and (d) sealing means forming a vacuum tight seal between said first and second shield members, whereby air flow between said space surrounding said mold halves and the atmosphere outside said shield members is prevented and heat transfer to said atmosphere is reduced.