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:
Dec. 11, 2001
Filed:
Mar. 24, 2000
Applicant:
Inventor:
Tatsuji Kinukawa, Nagoya, JP;
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Primary Examiner:
Int. Cl.
CPC ...
B23B 5/48 ; B23B 2/722 ;
U.S. Cl.
CPC ...
B23B 5/48 ; B23B 2/722 ;
Abstract
A plunge-cutting forming tip which improves chip disposal. A protrusion (,) is disposed on a rake face (,) in the vicinity of the ridgeline of a plunge-cutting edge (,). In cutting by means of the tip (,), a chip (K) is ejected which is not only merely thin, but also is ejected in such a manner as to be partially squeezed as a result of pressing against the protrusion (,). Accordingly, the chip is ejected such that a cross section thereof is deformed into a channel shape instead of assuming a flat shape. Thus, the rigidity of the chip is increased, so that chip disposal is improved accordingly.