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:
Feb. 12, 2008
Filed:
Apr. 19, 2006
Kazutaka Iwata, Hitachinaka, JP;
Shinichi Sakamoto, Hitachinaka, JP;
Tomoyoshi Yokota, Hitachinaka, JP;
Kenichirou Yoshida, Hitachinaka, JP;
Tomomasa Nishikawa, Hitachinaka, JP;
Atsushi Nakagawa, Hitachinaka, JP;
Kazutaka Iwata, Hitachinaka, JP;
Shinichi Sakamoto, Hitachinaka, JP;
Tomoyoshi Yokota, Hitachinaka, JP;
Kenichirou Yoshida, Hitachinaka, JP;
Tomomasa Nishikawa, Hitachinaka, JP;
Atsushi Nakagawa, Hitachinaka, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
A power tool includes a brushless motor, a cooling fan, and a driving unit in a housing. The brushless motor is provided in the housing and having a rotary shaft. The cooling fan is attached to the rotary shaft in the housing, and rotatable together with the rotary shaft. The driving unit is provided in the housing for driving the motor. The driving unit includes an inverter circuit having a circuit board and a plurality of switching elements mounted on the circuit board. The circuit board is positioned on an opposite side to the motor with respect to the cooling fan. The plurality of switching elements is positioned around the cooling fan in a circumferential direction about the rotary shaft.