Mold-closing apparatus for injection-molding machine
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United States of America Patent
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-
Aug 9, 1994
Grant Date -
N/A
app pub date -
Mar 2, 1993
filing date -
Mar 23, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A molding system has a base, a fixed mold plate secured to the base, a fixed mold half carried on the fixed mold plate, a movable mold plate displaceable on the base longitudinally forward away from the fixed mold half and backward toward the fixed mold half, and a movable mold half carried on the movable plate and fittable with the fixed mold half. A mold-closing apparatus has a pair of main cylinders fixed to the fixed mold half and respective main pistons subdividing the main cylinders into respective front and rear main compartments and each having a piston rod secured to the movable mold plate and formed with a longitudinally extending chamber. A small-diameter fast-closing piston and cylinder are formed in one of the piston rods, and the other piston rod is provided internally with a force-amplifying piston unit. Two flow-control valves and check valves control the system.
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