Insert molding method and a retractable insert- molding pin

Details Insert molding method and a retractable insert- molding pin Insert molding method and a retractable insert- molding pin

A - Human Necessities

63

H

46/116

A63H 3/00 (2006.01) B29C 33/12 (2006.01)

Patent

CA 1211937

Abstract of the Invention The present invention pertains to an insert-molding method, and collapsible insert molding pin assembly. A molding insert is provided with a plurality of collapsible pin assemblies each including a hollow, cylindrical boss, a piston, a valve and a pin. The collapsible pin assemblies locate the molding insert in a mold cavity until pressure exerted by inflowing molding material causes the piston carrying the pin to retract into the hollow cylindrical boss.

428709

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