Mold-closing apparatus for injection-molding machine

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

1993-03-02

1994-08-09

Mackey, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

425590, 425595, 4254512, 425DIG223, B29C 4568

Patent

active

053364627

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.

REFERENCES:
patent: 3418693 (1968-12-01), Harrison
patent: 3663140 (1972-05-01), Hehl
patent: 4105385 (1978-08-01), Hehl
patent: 4443179 (1984-04-01), Wohlrab
patent: 4846664 (1989-07-01), Hehl
patent: 4865537 (1989-09-01), Shima
patent: 5129806 (1992-07-01), Hehl
patent: 5204047 (1993-04-01), Wohlrab
E. Sauerbruch; "Aufbau und Funktion Einer Neuartigen Spritzgiessmaschine"; Kunststoffe-Bd. 61-1971-H.6; 2 pp.

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