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:
Aug. 07, 2012
Filed:
Sep. 18, 2007
Nobuhiro Takano, Ibaraki, JP;
Yoshikazu Kawano, Ibaraki, JP;
Kazuhiko Funabashi, Ibaraki, JP;
Yuuichi Konuma, Ibaraki, JP;
Masateru Niyada, Ibaraki, JP;
Chikai Yoshimizu, Ibaraki, JP;
Eiji Nakayama, Ibaraki, JP;
Kenro Ishimaru, Ibaraki, JP;
Nobuhiro Takano, Ibaraki, JP;
Yoshikazu Kawano, Ibaraki, JP;
Kazuhiko Funabashi, Ibaraki, JP;
Yuuichi Konuma, Ibaraki, JP;
Masateru Niyada, Ibaraki, JP;
Chikai Yoshimizu, Ibaraki, JP;
Eiji Nakayama, Ibaraki, JP;
Kenro Ishimaru, Ibaraki, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
When a battery pack having an output voltage of 14.4 V that is connectable to an electric tool in a sliding manner is used as a power supply source for the electric tool that is connectable to a battery pack in an insertion manner and has a rated voltage of 12 V, the electric tool and the battery pack are connected to each other with an adaptor interposed therebetween. The adaptor has an FET that is switched at a predetermined duty of a predetermined frequency. The battery pack and the electric tool are connected or disconnected to or from each other by the switching operation, thereby dropping the output voltage of the battery pack. The voltage from the battery pack is detected. When the detected voltage is out of a predetermined value range, it is judged that the overcurrent or overdischarge has occurred. Then, the FET is turned off to stop the electric tool.