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:
Apr. 20, 1976
Filed:
Apr. 18, 1975
Klockner-Werke AG, Duisburg, DT;
Abstract
An injection molding machine wherein a screw rotates and reciprocates in a barrel to plasticize granular synthetic material and to expel plasticized material into a mold. The screw is reciprocated by the piston of a hydraulic cylinder one chamber of which is connected with the outlet of a first pressure relief valve which determines the pressures of fluid while the screw moves forwardly to expel plasticized material, and with the inlet of a second pressure relief valve which determines the pressure of fluid while the screw moves rearwardly during plastification of granular material. The pressure relief valves are controlled by a pressure selecting valve which, in turn, is controlled by a programming unit. The inlet of the first pressure relief valve is connected directly with a line for highly pressurized fluid, and the outlet of the second pressure relief valve is connected with the tank. A fluid flow regulating valve controls the flow of hydraulic fluid from the high pressure line to the control ports of the pressure relief valves and to one port of the pressure selecting valve. Another port of the latter valve is connected with the tank.