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US 5,482,101 AGranted
Pressing-in device
AssigneeOskar Frech GmbH + Co. KG
InventorRoland Fink
Life of this patent
Estimating the term…
Abstract
Pressing-in devices of pressure die casting machines operate as hydraulically driven multiphase as pressing-in systems in order to exercise a different pressure on the casting material during different phases of the casting operation. The casting piston of a pressing-in device is driven by at least one electric motor. In this case, the drive advantageously takes place using a multispeed servomotor which interacts with a multiple-roll spindle.
Claims9
An apparatus comprising:
- a pressure die casting machine;
- a pressing-in device for said pressure die casting machine, said pressing-in device comprising a casting piston for pressing casting material into a mold, and an electric motor for driving said casting piston via a spindle interacting with a nut;
- wherein the nut for the spindle is fixedly connected with rotors of the electric motor, said nut engaging with a threaded portion of the spindle, and wherein said rotors form a protective housing completely enclosing the threaded portion of the spindle.
Dependencies are inferred from the claim text.