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:
May. 09, 1978
Filed:
Mar. 01, 1977
Robert E Farrell, Springfield, MA (US);
Package Machinery Company, East Longmeadow, MA (US);
Abstract
An injection molding machine has two stationary platens interconnected by tie bars and an immediate third platen which is movable on the tie bars. Separable mold portions are mounted respectively on one of the stationary platens and the third platen so that reciprocating movement of the third platen along the tie bars opens and closes the mold portions. A pair of toggle linkage mechanisms positioned at opposite sides of the machine and connecting with the movable third platen and one of the other platens are used to lockup the mold portions when the linkages assume their toggle positions. To move the toggle mechanisms into the toggle positions, a crosshead on slide rods connects with the mechanisms and is pushed away from the third platen at lockup by two piston and cylinder assemblies extending between the platen and the crosshead. The positioning of the cylinders and crosshead minimizes the overall length of the molding machine and permits mold lockup to be triggered more accurately.