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:
Jun. 25, 1996
Filed:
Jan. 20, 1995
Applicant:
Inventors:
Michael Schwarz, Heidenheim, DE;
Helmut Pfeifhofer, Sydney, AU;
Assignee:
Voith Sulzer Stoffaufbereitung GmbH, Ravensburg, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B65G / ;
U.S. Cl.
CPC ...
198676 ; 198662 ;
Abstract
The invention concerns a feed screw in the form of a self-supporting, axleless helix whose surface extends essentially radially, the feed screw being used in sedimentation or treatment systems for clearing suspensions in paper making processes. The invention is characterized by a second helix whose surface, or generatrix, deviates preferably between 0.degree. and 20.degree. from the direction of the central axis and extends in the feed direction. The second helix may deviate between 0.degree. and maximally 40.degree. and have a length--per lead--between 20% and 40% of the lead of the helices.