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:
Aug. 30, 1988
Filed:
Jun. 19, 1987
Applicant:
Inventors:
Michihiro Shoji, Tokyo, JP;
Toshio Mikiya, Tokyo, JP;
Assignee:
Nitto Kohki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23B / ;
U.S. Cl.
CPC ...
408204 ; 408206 ; 408703 ;
Abstract
An annular hole cutter is disclosed which has a plurality of cutting teeth disposed about a lower end of a cylindrical annular wall, each tooth having intersecting back-off surfaces, a first back-off surface inclining inwardly and a second back-off surface inclining outwardly. Teeth with high and wide cutting edges alternate with teeth having a low and narrow cutting edge, thereby reducing stress on the teeth, dissipating heat more effectively and preventing the blockage of the hole cutter by the cut chips.