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. 26, 1987
Filed:
May. 08, 1986
Shoichiro Tsugaki, Tokyo, JP;
Tomoo Miyasaka, Funabashi, JP;
Yukio Nishiyama, Akashi, JP;
Toshio Atsuta, Akashi, JP;
Abstract
A method of manufacturing a rock bit cone having a substantially conical body on a surface of which a number of teeth are formed is manufactured by pressure-casting with using a casting mold having a molding surface including a cone body defining surface portion and tooth defining surface portions, pouring a molten metal of very hard and low melting point alloy having a melting point of 1040.degree.-1120.degree. C. and Rockwell hardness of 55-65 to the casting mold to centrifugal-cast at least a predetermined area including a tip of each tooth with the hard metal, and pouring a molten tough metal to the casting mold to centrifugal-cast the cone body.