Hydraulic actuator for injection molding machine

Details Hydraulic actuator for injection molding machine Hydraulic actuator for injection molding machine

1979-10-19

1982-04-20

Michalsky, Gerald A.

Motors: expansible chamber type

With motive fluid valve

Valved piston

91519, 4254512, 425590, F15B 1118

Patent

active

043252877

ABSTRACT:
A hydraulic actuator assembly for use in the die closing unit of an injection molding machine, the actuator assembly having a large power cylinder and a smaller travel cylinder with a large power piston and a small travel piston on a common piston rod, and bypass channels in the power piston which are openable and closable by means of an annular valve plunger moving on a guide sleeve on the piston rod. The valve plunger and the guide sleeve have three stepped cooperating sliding diameters forming bypass opening and closing plunger pressure spaces. Hydraulic pressure is supplied to the two pressure spaces through bores in the piston rod.

REFERENCES:
patent: 3935791 (1976-02-01), Hehl
patent: 4158327 (1979-06-01), Aoki

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