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. 11, 1991
Filed:
Aug. 29, 1989
Harald H Schmidt, Georgetown, CA;
Mold-Masters Limited, Georgetown, CA;
Abstract
A multi-cavity valve gates injection molding system. The pneumatic actuating mechanism to reciprocate each elongated valve member includes a piston which reciprocates in a cylindrical opening through a cylinder plate. A sealing bushing which is mounted around each valve member has a flanged portion which bridges an insulative air gap between the manifold and the cylinder plate. Thus, the sealing bushing forms part of the piston cylinder as well as sealing against melt leakage around the reciprocating valve member. The piston has a circumferential outer band formed of a graphite alloy seated in a groove formed between a front portion and a removable rear plate portion.