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. 09, 2003
Filed:
Mar. 01, 2002
Applicant:
Inventors:
Katsuhiro Oomori, Ibaraki, JP;
Chikai Yoshimizu, Ibaraki, JP;
Masanori Watanabe, Ibaraki, JP;
Shinki Ohtsu, Ibaraki, JP;
Takuma Saito, Ibaraki, JP;
Toshiyuki Nemoto, Loveland, OH (US);
Assignee:
Hitachi Koki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K 7/14 ; H02K 5/24 ;
U.S. Cl.
CPC ...
H02K 7/14 ; H02K 5/24 ;
Abstract
In a motor-driven tool, a carbon brush part is arranged between a suction port and a commutator of the motor and includes a cylindrical side wall . The cylindrical side wall located on an outer periphery of the commutator is provided with a tapered portion which grows wider toward the commutator and grows narrower toward a coil end of the armature. Between the carbon brush part and the coil end , there is provided a heat radiating plate made of metal and adapted to be engaged with the carbon brush part