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:
Sep. 16, 2003
Filed:
Aug. 06, 2001
Applicant:
Inventors:
Junichi Kamimura, Hitachinaka, JP;
Mitsuo Ogura, Hitachinaka, JP;
Mitsuyuki Ishikawa, Hitachinaka, JP;
Yoshimitsu Kawasaki, Yamato, JP;
Juurou Kobayashi, Hitachinaka, JP;
Naoya Eto, Hitachinaka, JP;
Hiroto Inagawa, Mito, JP;
Takuhiro Murakami, Hitachinaka, JP;
Satsuo Sato, Hitachinaka, JP;
Yoshikazu Yokoyama, Hitachinaka, JP;
Assignee:
Hitachi Koki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 4/04 ;
U.S. Cl.
CPC ...
E21B 4/04 ;
Abstract
Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission key composed of high-strength plastic is provided between an output shaft and a gear , and a plane or a V-groove is formed on each of the output shaft and the gear contacting the power transmission key