Patent · US Expired

Backflow preventer for an injection molding machine

US4477242A · kind A · utility

31Cited by

2References

4Claims

0Family size

Assignee

KraussMaffei GmbH · DE

Inventors

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

Key dates

Filing date	Jan 19, 1983
Grant date	Oct 16, 1984
Priority date	—
Expiry date	Jan 19, 2003

Classification

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

Abstract

A backflow preventer at the end of an injection molding worm has a pressure ring which abuts directly upon the worm and serves a shank of the valvehead which also bottoms in a bore upon the worm so that force transmission to the worm is over its entire cross section. The shank is surrounded by a blocking ring which can shift in its axial stroke between a position in which it abuts the head and a position in which it abuts the pressure ring, the axial stroke being adjustable by shims forming the floor against which the shank abuts within the bore of the worm.

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