Hydraulic drive for the die closing unit of an injection molding

Details Hydraulic drive for the die closing unit of an injection molding Hydraulic drive for the die closing unit of an injection molding

1975-01-31

1976-02-03

Geoghegan, Edgar W.

Motors: expansible chamber type

Differential

92146, F15B 1102

Patent

active

039357910

ABSTRACT:
A hydraulic drive for the die closing unit of an injection molding machine in which at least one power cylinder and power piston with a coaxially attached auxiliary cylinder opens and closes the molding die by executing the opening and closing travel with a differential piston action in the power cylinder and/or with the auxiliary cylinder, while valve-closable bypass channels in the power piston are kept open. The closing of these channels switches the drive from an accelerated travel mode to a high-pressure die clamping mode.
An annular valve plunger cooperates with a valve seat on the power piston to open and close the bypass channels, several alternatives of guiding and hydraulically moving the valve plunger being contemplated.

REFERENCES:
patent: 3340756 (1967-09-01), Mize
patent: 3663140 (1972-05-01), Hehl

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