B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/160
B29C 33/10 (2006.01) B29B 15/00 (2006.01)
Patent
CA 1275555
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 expan- sion 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 un- cured 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.
568214
Corn States Metal Fabricators Inc.
Marks & Clerk
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