Adjustable injection molding backflow preventer

US4512733A · kind A · utility

Assignee

• KraussMaffei GmbH · DE

Inventors

• Martin Eichlseder · Tettenweis, DE
• Erwin Burkle · Benediktbeuern, DE

Key dates

• Filing date: Jan 19, 1983
• Grant date: Apr 23, 1985
• Expiry date: Jan 19, 2003

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C45/52
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A backflow preventer on the end of a plastifying screw for an injection molding apparatus has a housing provided with radial bores which are axially and angularly offset. A pin accessible from the exterior of the housing passes through a radial hole but traversing in a valve member with clearance to permit the stroke of the valve member to be adjusted by selective insertion of the pin in the bores.