Patent · US Expired

Check valve arrangement for the discharge end of an extruder, plastifier or the like

US4530605A · kind A · utility

15Cited by

2References

6Claims

0Family size

Assignee

KraussMaffei GmbH · DE

Inventors

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

Key dates

Filing date	Dec 20, 1983
Grant date	Jul 23, 1985
Priority date	—
Expiry date	Dec 20, 2003

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C45/52
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A check valve at the end of a plastifying worm for an extrusion or injection molding machine comprises a valve ring whose inner diameter is greater than that of a tip at the end of the head of the worm and which surrounds the neck connecting this tip with the valve seat of the worm. Spacers, preferably balls, are disposed between the ring and the tip and the surfaces of the ring and the tip flanking the balls are oriented to allow radial removal of the balls when the valve projects from the cylinder.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.