The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 1986
Filed:
Aug. 01, 1984
Lothar Gutjahr, Denzlingen, DE;
Klockner-Werke Aktiengesellschaft, Duisburg, DE;
Abstract
A mold closing unit of an injection molding machine has a threaded spindle which is engaged with the movable mold clamping plate of the machine via a spindle nut. The spindle is attached to the stationary mold clamping plate of the machine in a freely pivotable manner, and is connected with a stepping motor by means of a coupling. The stepping motor is controlled depending on a specified speed pattern as a function of the distance between the mold halves of the mold clamping plates. The valve body of a 4/2-way valve engages the spindle for relative axial movement and controls the hydraulic operating medium for the mold closing unit. A switch is arranged in the casing of the valve which can be triggered by the coupling and which actuates, for example, an indication system when a mold closure security error occurs.