Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With coupling between charger and mold
Patent
1996-08-06
1998-02-24
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With coupling between charger and mold
425588, B29C 4522
Patent
active
057209952
ABSTRACT:
Multi-cavity injection molding apparatus having two heated manifolds interconnected by a connector bushing all extending in a common plane. A threaded portion of the connector bushing is screwed into a threaded opening in one manifold and a nonthreaded portion of the connector bushing is received in a nonthreaded opening in the other manifold. The nonthreaded portion of the connector bushing fits in the nonthreaded hole in the other manifold tightly enough to prevent melt leakage, but is still able to slide sufficiently in the opening to accommodate thermal expansion and contraction of the heated nozzles relative to the cooled mold in which they are mounted and located. In one embodiment, the connector bushing is made of a material such as a beryllium copper alloy having a greater coefficient of expansion than the steel manifolds so it can be easily installed and then expand to produce this fit when heated to the operating temperature.
REFERENCES:
patent: 4219323 (1980-08-01), Bright et al.
patent: 4761343 (1988-08-01), Gellert
patent: 5366369 (1994-11-01), Gellert
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