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:
May. 13, 1986
Filed:
Oct. 04, 1983
Applicant:
Inventors:
Pentti Raura, Valko, FI;
Johan J Hotma, Valko, FI;
Assignee:
Rauma-Repola Oy, Valko, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B27C / ;
U.S. Cl.
CPC ...
144176 ; 83 16 ; 83171 ; 1441 / ; 241 95 ; 2412921 ; 361233 ;
Abstract
A method for limiting the dulling of wood-machining blades wherein the blades are insulated from the frame of a woodworking machine tool and a negative voltage is applied to the blades during operation. The blade ring of the chipper is insulated from the rotating rotor of the chipper so that between the blade ring and the rotor there is generated a differential voltage the rotor carrying a positive voltage and the blade ring a negative voltage. By virtue of the invention, the blades need not be replaced or sharpened as often as those of prior art chippers.