Injection molding rack and pinion valve pin actuating mechanism
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United States of America Patent
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-
Apr 24, 1990
Grant Date -
N/A
app pub date -
Dec 21, 1988
filing date -
Dec 21, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve gated injection molding system having a double acting pneumatic rack and pinion valve pin actuating mechanism. The melt passage branches in a manifold from a central inlet and flows along the valve pin in a central bore in the nozzle to the gate. A pneumatically driven piston pivots a toothed pinion member mounted in a slot in the manifold. The pinion member engages a toothed rack member which reciprocates along a straight line in the slot in the manifold and engages an enlarged head of the valve pin in a slot in the rack member. Lateral forces from the pinion member are absorbed by sliding contact of surfaces of the rack member against matching surfaces of the slot and/or a valve pin bushing, and are not transmitted to the valve pin. This avoids uneven wear and buildup of melt deposits around the valve pin which can otherwise result in leakage and malfunction.
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