Pressure molding apparatus for molten resin having a limit switc

Details Pressure molding apparatus for molten resin having a limit switc Pressure molding apparatus for molten resin having a limit switc

1992-03-18

1993-08-24

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means between charger and mold to cut off flow of...

425570, 425572, 425577, B29C 4523

Patent

active

052383920

ABSTRACT:
A pressure molding apparatus for supplying molten resin to a mold includes a gate unit having an aperture therein for passage of molten resin into a mold cavity of the mold, a gate pipe connected for communication with the gate unit, and a gate pin which is axially movable within the gate pipe. The gate pin has a gate pin end at one end and a tip at another end thereof, the tip being engageable with the aperture for controlling flow of molten resin through the gate unit. The apparatus also includes a manifold pipe for supplying molten resin to the gate pipe, a connection arrangement for connecting the gate pipe to the manifold pipe. The connection arrangement includes a receiving portion for receiving molten resin from the manifold pipe, the gate pin passing completely through the receiving portion and the gate pin end extending beyond the connection arrangement. A limit switch arrangement is provided for detecting movement of the gate pin end to a predetermined position, the limit switch arrangement producing a signal indicative of whether the gate pin end is at the predetermined position. A molten-resin supply pipeline is also provided which includes a base pipe for supplying the molten resin to the interior of the manifold pipe, and the base pipe is connected to the manifold pipe by a pillar pipe.

REFERENCES:
patent: 4106887 (1978-08-01), Yasuike et al.
patent: 4389358 (1983-06-01), Hendry
patent: 4395222 (1983-07-01), Gaiser et al.
patent: 4470796 (1984-09-01), Stroup et al.
patent: 4512730 (1985-04-01), Kudert et al.
patent: 4669971 (1987-06-01), Gellert
patent: 4702689 (1987-10-01), Schmidt et al.
patent: 4958676 (1990-09-01), Kuntz

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