Method of using a mold closing apparatus for an injection molding machine
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United States of America Patent
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-
Apr 20, 1993
Issued Date -
N/A
app pub date -
Jul 8, 1991
filing date -
Oct 31, 1986
priority date (Note) -
In Force
status (Latency Note)
Importance
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-acting 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 comprises the necessary hydraulic passages 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 closing force. Locating these single-acting pistons within the support column cylinders makes for an even more compact apparatus.
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