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:
Mar. 27, 2007
Filed:
Jul. 16, 2004
Nobuhiro Takano, Hitachinaka, JP;
Takao Aradachi, Hitachinaka, JP;
Hidekazu Harada, Hitachinaka, JP;
Kenrou Ishimaru, Hitachinaka, JP;
Takeshi Takeda, Hitachinaka, JP;
Nobuhiro Takano, Hitachinaka, JP;
Takao Aradachi, Hitachinaka, JP;
Hidekazu Harada, Hitachinaka, JP;
Kenrou Ishimaru, Hitachinaka, JP;
Takeshi Takeda, Hitachinaka, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
A DC power source unit supplies a DC voltage to a power tool through an adapter when a power switch of the tool is turned ON and also charges a battery pack used as an alternative power source of the tool when the power tool is not operated. In order to prevent a rush current from flowing in a switch interposed between a switching power source circuit and the battery pack when charging the battery pack is commenced, the switch is rendered OFF when the output voltage from the switching power source is greater than the battery voltage. Charging the battery is started upon once lowering the output of the switching power source to a level lower than the battery voltage.