Valve unit for a mold vent

Details Valve unit for a mold vent Valve unit for a mold vent

1983-06-03

1985-01-08

Silbaugh, Jan

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

425 28R, 425390, 425812, B29H 502

Patent

active

044925549

ABSTRACT:
Separable mold sections of a tire forming machine are brought together to form a tire cavity within which a preformed tire band is continuously expandable toward and against the inner surface of the cavity side wall. During the tire shaping operation, air is forced by the expanding tire band from the cavity and into the atmosphere through vents having vent opening and closing valve units. As the expanding tire band moves into conforming engagement with the inner surface of the cavity side wall, the final residual air in the cavity is forced therefrom concurrently with the valve units at the terminal cavity ends of the vents being engaged and moved by the expanding tire band to vent closing positions wherein the velve units form a smooth surface continuous with the inner surface of the tire cavity.

REFERENCES:
patent: 3854852 (1974-12-01), Carter
patent: 3885618 (1975-05-01), Hodler

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