Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – With means for selectively changing the speed or force...
Patent
1979-10-19
1982-05-18
Hershkovitz, Abraham
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
With means for selectively changing the speed or force...
91416, 91422, 91437, 91533, F15B 1116
Patent
active
RE0309346
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: 2755779 (1956-07-01), Muller
patent: 3340756 (1967-09-01), Mize
patent: 3456297 (1969-07-01), Ake Andreasson
patent: 3663140 (1972-05-01), Hehl
patent: 3818801 (1974-06-01), Kime
patent: 3916766 (1975-11-01), Huelskamp
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