Patent ID: 8657599

Claim:
An apparatus for demolding negatives in plastic injection molding, the apparatus comprising an ejector for ejecting a plastic injection mold, a guide bushing ( 2 ) attachable to a die plate on a movable part ( 41 ) of a mold, inside which a counter-mold ( 4 ) extends which molds a negative ( 5 ) formed of a guide runner ( 6 ) and a collapsible head ( 7 ) to demold the negative ( 5 ), inside the guide bushing ( 2 ) a projection ( 8 ) pushing against a side of the head ( 7 ) as the counter-mold ( 4 ) moves forward to force the head ( 7 ) to laterally collapse and to release the negative ( 5 ), inside the guide bushing ( 2 ) a stop ( 9 ) being positioned to prevent entry by the counter-mold ( 4 ), for limiting a run and eliminating burrs in a molded piece, and the projection ( 8 ) and the stop ( 9 ) forming a single removable piece ( 10 ) which fits into housings ( 2 a ) inside the guide bushing ( 2 ).