Apparatus having an in-the-mold gas injection pin

Details Apparatus having an in-the-mold gas injection pin Apparatus having an in-the-mold gas injection pin

1991-05-16

1993-03-30

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264403, 264572, 425144, 425145, 425149, 425564, B29C 4576

Patent

active

051982382

ABSTRACT:
An apparatus for use in gas assisted injection molding of plastic material so as to form an injection molded product includes a pair of mold members defining when closed a sealed cavity. A first opening is provided in one of the mold members for allowing the injection of a plastic material into the cavity. A device is provided to supply a pressurized gas and a second opening is provided in one of the mold members for allowing the injection of the pressurized gas into the cavity. A probe is located in the second opening and is adapted to be reciprocated therein from a retracted position to an extended position. The probe has a first end adapted to selectively extend into the cavity, a second end, and a longitudinally extending bore which terminates in a port located adjacent the first end. The bore is used to guide the gas into the cavity. A device is provided for reciprocating the probe in relation to the cavity. A control system controls the operation of the device for reciprocating as well as the device for supplying a gas.

REFERENCES:
patent: 3716318 (1973-02-01), Erik et al.
patent: 4208176 (1980-06-01), Salerno
patent: 4632652 (1986-12-01), Farrell
patent: 4740150 (1988-04-01), Sayer
patent: 5037285 (1991-08-01), Kudert et al.
patent: 5044924 (1991-09-01), Loren

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