Injection molding system having clamped rotatable nozzles and method
AssigneeMold-Masters Limited
InventorsHarald H. Schmidt, Jobst U. Gellert, Rory McDowall
Life of this patent
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Abstract
This invention relates to a valve gated injection molding system in which a number of melt conveying nozzles leading to a common cavity are releasably clamped to the side surface of an elongated manifold. A cylindrical collar around the inlet to each nozzle is received in a recessed seat around each outlet from the manifold. This structure facilitates assembly and ensures alignment of the inlets and outlets, while permitting for some rotational movement between the nozzles and the manifold due to thermal expansion. The integral nozzles are made by vacuum casting a heating element and vacuum brazing a side member with a sidewards projecting face into a steel main body.
Claims4
In a multi-gate injection molding system having a plurality of heated nozzles extending from a common elongated manifold with a side surface, the manifold having a longitudinal melt bore extending from an outlet to a plurality of outlet bores, each outlet bore leading to an outlet on the side surface of the manifold, each nozzle having a forward end and a rear end, each nozzle being located with the forward end seated in a well in a core and having a melt channel extending to a central gate leading to a common cavity, the improvement wherein;
- (a) each nozzle has a side portion with a central face which projects sidewards adjacent the rear end,
- (b) the melt channel of each nozzle has a lateral portion and a generally longitudinal portion, the lateral portion around a smoothly curved bend to the longitudinal portion, the longitudinal portion leading to the gate adjacent the forward end, and
- (c) clamping means to rotatably mount each nozzle to the manifold with the central face of the side portion of the nozzle abutting against the side surface of the manifold with the melt channel inlet in alignment with a respective one of the outlets from the manifold, the clamping means being operative to releasably secure the nozzle to the manifold in any desired angular position.
Dependencies are inferred from the claim text.