Patent ID: 7455515
Filing Date: 2008-11-25
Classification: B29C

Abstract:
1. A sprue bar nozzle assembly for controlling flow of melt through conduits of a mold assembly, the sprue bar nozzle assembly comprising a sprue bar extension and a nozzle in fluid communication with the sprue bar extension for controlling flow of melt through the sprue bar extension, the sprue bar extension comprising means for adjusting the overall length of the sprue bar nozzle assembly, the nozzle comprising a nozzle valve bore, a nose comprising a seating surface for engagement with a mating surface of a mating segment of a melt conveying conduit, a nozzle slide valve received within the nozzle valve bore and having a valve passage in fluid communication with one of a nozzle inlet and nozzle outlet and terminating in orifices that are covered or exposed according to the location of the slide valve relative to the other of the nozzle inlet and nozzle outlet, an open position of the slide valve permitting melt to flow through the slide valve and nozzle and a closed position preventing melt from flowing through the slide valve and nozzle, an arm projecting from the nozzle slide valve transverse to and passing through an opening in the nozzle, opposed ends of the arm extending beyond the nozzle valve bore, and a biasing means, the biasing means applying a force to the arm in the direction to locate the slide valve to cover the orifices, the nozzle being mounted so that the slide valve is driven to the open position by forces applied to the nose as a result of closure of an associated mold assembly.