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. 21, 2009
Filed:
Apr. 04, 2006
Applicants:
Kazuhiko Funabashi, Hitachinaka, JP;
Takao Aradachi, Hitachinaka, JP;
Hiroyuki Hanawa, Hitachinaka, JP;
Masayuki Ogura, Hitachinaka, JP;
Inventors:
Kazuhiko Funabashi, Hitachinaka, JP;
Takao Aradachi, Hitachinaka, JP;
Hiroyuki Hanawa, Hitachinaka, JP;
Masayuki Ogura, Hitachinaka, JP;
Assignee:
Hitachi Koki Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01M 10/46 (2006.01);
U.S. Cl.
CPC ...
Abstract
A cordless power tool uses a lithium battery as a power source of a motor and is provided with an overcurrent protection circuit. The circuit allows an overcurrent to instantaneously flow at the start-up time of the motor and shuts off an overcurrent which may flow when the motor is brought into a locked state during the use of the power tool.