Injection mold for making a synthetic thermoplastic article havi

Details Injection mold for making a synthetic thermoplastic article havi Injection mold for making a synthetic thermoplastic article havi

1980-10-02

1982-10-12

Flint, Jr., J. Howard

Static molds

Container-type molding device

And an inner removable core to form recess or opening

425DIG218, 425DIG58, 425398, B79C 700

Patent

active

043535224

ABSTRACT:
An injection mold comprises an outer mold structure defining an abutment surface and a core axially slidable in this structure between a molding position and a second position. The core defines a mold cavity with the outer mold structure in the molding position to mold a tubular end portion of a synthetic thermoplastic resin article therein. The core includes an annular rib defining an internal peripheral annular groove of the end portion and an end to which a mold sleeve is axially immovably connected. The mold sleeve has an end face facing and conforming to the abutment surface upon axial sliding of the core into the molding position. The mold sleeve and core end have converging confronting surfaces defining an annular gap tapering toward the core end, the annular gap defining a free end of the tubular end portion extending outwardly from an annular section thereof surrounding the groove. The core and mold sleeve are jointly axially slidable into the second position for removing the free end from the annular gap with elastic deformation.

REFERENCES:
patent: 3020594 (1962-02-01), Makowski
patent: 3861847 (1975-01-01), Barnett
patent: 3915613 (1975-10-01), Ruch
patent: 3998578 (1976-12-01), Acda
patent: 4065243 (1977-12-01), Acda et al.
patent: 4127632 (1978-11-01), Auger
patent: 4161384 (1979-07-01), McGregor

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