Venting unit for a rubber article forming mold having vents

Details Venting unit for a rubber article forming mold having vents Venting unit for a rubber article forming mold having vents

1987-09-18

1988-07-26

Nozick, Bernard

Plastic article or earthenware shaping or treating: apparatus

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

425 35, 425 47, 425812, B29B 1500

Patent

active

047597011

ABSTRACT:
A venting unit is inserted in a press fit within the air vent of a rubber article forming mold and is comprised of a cylindrical body member with an axial bore having a reduced outer end section forming an air inlet open to the mold cavity. Received for reciprocal axial movement within the bore between an inlet closed position in abutting engagement with the outer end section and an inlet open position removed from the outer end section is a heat absorbing piston or disc. The opposite or inner end section of the bore receives a vented plug in a press fit to form a radially inwardly projected shoulder and a spring is held in compression between the disc and the shoulder of the vented plug. During expansion of the rubber article, pressurized air in the mold cavity urges the disc to its inlet open position and is vented to the atmosphere. As the rubber article reaches its final form, venting of air is completed and any uncured rubber in the air inlet contacts the disc to set the rubber within the confines of the air inlet. The rubber in the air inlet forms a part of the molded article which, upon its removal from the mold, will exhibit only a minimal surface irregularity.

REFERENCES:
patent: 4351789 (1982-09-01), Sidles
patent: 4492554 (1985-01-01), Carter
patent: 4662833 (1987-05-01), Carter

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