Gas supply sprue bushing for injection molding machines

Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common...

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Details

264572, 425197, 425562, 425564, 425573, B29C 4516

Patent

active

050490567

ABSTRACT:
A bushing used in an injection molding machine and positioned between the nozzle and the sprue thereof includes an adaptor body having a longitudinal axis, a first end and a second end. A first bore extends in the adaptor body parallel to the longitudinal axis from the second end to the first end for accommodating a flow of relatively viscous fluid such as a molten thermoplastic. A bridge extends transversely across the first bore between opposing walls of the bore adjacent the adaptor body first end. Fluid flow is allowed through the first bore around the bridge. A second bore extends from a surface of the adaptor body to a surface of the bridge for accommodating a flow of a relatively non-viscous fluid such as gas. The second bore terminates on the bridge surface so as to be substantially coaxial with the first bore.

REFERENCES:
patent: 4474717 (1984-10-01), Hendry
patent: 4781554 (1988-11-01), Hendry
patent: 4824732 (1989-04-01), Hendry et al.
patent: 4855094 (1989-08-01), Hendry
4 Drawings of a Sprue Body, One dated 6-21-83 and One dated 1-23-84.

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