B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/680
B29D 1/00 (2006.01) B29C 45/02 (2006.01)
Patent
CA 1046718
ABSTRACT OF THE DISCLOSURE Transfer molding apparatus is disclosed compris- ing a multi-cavity mold, an injection unit having a primary chamber from which elastomeric stock can be transferred, an adapter for defining a secondary chamber communicating with the primary chamber, a valve inter- posed between the primary and secondary chambers for permitting alastomeric stock to flow unidirectionally from the primary chamber to the secondary chamber, an apertured end plate carried by, and axially movable in the secondary chamber of, the adapter in confronting relation with the mold, and a system for moving the in- jection unit and mold relative to one another to effect engagement of the mold with the end plate and thereby shift the latter inwardly of the secondary chamber to reduce the axial extent of the latter and expel elasto- meric stock through the end plate and into the mold cavities, the valve cooperating with the end plate during the inward movement of the latter and preventing backflow of elastomeric stock into the primary chamber from the secondary chamber despite the occurance of any pressure drop in the primary chamber.
223931
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