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:
Apr. 22, 1997
Filed:
Apr. 10, 1995
Applicant:
Inventors:
Hiroshi Okada, Nabari, JP;
Tetsuji Nakai, Nabari, JP;
Assignee:
Nippon Pneumatic Manufacturing Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23P / ;
U.S. Cl.
CPC ...
29525 ; 1754201 ; 125 41 ; 30167 ; 30168 ;
Abstract
A chisel and a method of manufacturing a durable chisel. An axial hole is formed in a chisel so that the hole is open at the chisel tip. Non-metallic powder is then supplied into the axial hole. A core member made of cemented carbide or other material harder than the chisel body is then press-fitted into the axial hole. By inserting the core member into the hole, the non-metallic powder flows so as to fill up any space between the rear end face of the core member and the closed end of the axial hole.