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:
Apr. 02, 1985
Filed:
May. 25, 1983
Applicant:
Inventor:
Dietmar Anders, Hanover, DE;
Assignee:
Hermann Berstorff Maschinenbau GmbH, Hanover, DE;
Primary Examiner:
Int. Cl.
CPC ...
B29B / ;
U.S. Cl.
CPC ...
366 80 ; 366 90 ; 366601 ;
Abstract
In an extruder, for extruding thermoplastic synthetic material or rubber or for use for pressing water out of a material, a screw rotates in a cylindrical chamber and helical conveying lands provided on the screw are interrupted at positions at which pins project into the chamber thereby forming grooves to receive the pins. To sense breakage of a pin, for example caused by metal particles in the extrudate, signal-generating means are provided in a blind bore in each pin, receipt of a signal from the signal generating means causing the screw to be stopped from rotating thereby to prevent further damage.