Mold closing apparatus for an injection molding machine

Details Mold closing apparatus for an injection molding machine Mold closing apparatus for an injection molding machine

1993-02-05

1994-04-12

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

With means to close mold

425590, 425595, 4254501, 4254519, B29C 4568

Patent

active

053021088

ABSTRACT:
A mold closing apparatus and process for use with an injection molding machine are described. The mold is opened and closed by hydraulic pressure. The disclosed apparatus and method relate to the use of an immobile differential piston within a displaceable, double-action differential piston which moves within an immobile piston cylinder. This arrangement permits the use of smaller diameters to produce the necessary closing force. The immobile differential piston contains the necessary hydraulic passage for routing hydraulic fluid to the appropriate surfaces for exerting opening and closing forces. The use of a plurality of displaceable, single-acting pistons in parallel with the differential piston further reduces the diameters needed for exerting the claim force. Locating these single-acting pistons within the support column cylinders makes for an ever more compact apparatus.

REFERENCES:
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patent: 3156014 (1964-11-01), Wenger
patent: 3263277 (1966-08-01), Ohlendorf et al.
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patent: 3590440 (1971-07-01), Cook, Jr.
patent: 3716323 (1973-02-01), Classen
patent: 4017236 (1977-04-01), Penkman et al.
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Der Aufbau von Schliess-und Spritzeinheit: "Bewaehrte Systeme fuer die Zukunft" Ing. (grad.) H. Laberer, Konstruktion Mechanik (no translation).

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