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:
Nov. 03, 1981
Filed:
May. 23, 1980
Applicant:
Inventors:
Dietmar Anders, Hanover, DE;
Manfred Dienst, Burgdorf, DE;
Assignee:
Hermann Berstorff Meschinenbau GmbH, Hanover, DE;
Primary Examiner:
Int. Cl.
CPC ...
B29F / ;
U.S. Cl.
CPC ...
425147 ; 264102 ; 264D / ; 366 75 ; 425154 ; 425203 ; 425208 ; 425D / ;
Abstract
In venting means for a screw extruder, particularly for thermo-plastics material, which venting means comprises a substantially vertical venting shaft communicating with the bore of a cylinder of the extruder and coupled to a low pressure source by a pipe, a pivotable flap which is moved from its normal position shown, when acted upon by plastics melt being extruded and rising in the shaft due to malfunction of the extruder, to cover the end of the pipe and prevent the melt passing into the pipe.