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:
Jul. 07, 1992
Filed:
Dec. 10, 1990
Emmerich Bernhard, Graz, AT;
Johann Lileg, Graz, AT;
Johannes Kappel, Graz, AT;
Dag Bergloff, Graz, AT;
Bernhard Rebernik, Graz, AT;
Sven-Erik Henriksson, North Vancouver, CA;
Maschinefabrik Andritz Actiengesellschaft, Graz, AT;
Abstract
A drum refiner for grinding fibrous material, preferably chips, has an engine-driven drumshaped rotor which is placed on a horizontal shaft. The rotor has grinding surfaces extending parallel to the rotor axis and corresponding opposing grinding surfaces arranged on the housing. The grinding elements are placed symmetrically about at least one material feeds which are conveniently evenly distributed around the circumference of the rotor. The grinding surfaces begin parallel to the axis and contiguously increasing in inclination forming a grinding gap inclined towards the rotor axis at an angle of approximately 5.degree. to 45.degree., preferably 15.degree.. The second embodiment includes grinding surfaces contiguously increasing in inclination and ending with an angle of inclination of approximately 90.degree. to the rotor axis.