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:
Jun. 10, 2014
Filed:
Jun. 28, 2011
Masatoshi Atsumi, Osaka, JP;
Kenichiro Inagaki, Osaka, JP;
Tadashi Arimura, Osaka, JP;
Hiroyuki Kaizo, Osaka, JP;
Yutaka Yamada, Osaka, JP;
Masatoshi Atsumi, Osaka, JP;
Kenichiro Inagaki, Osaka, JP;
Tadashi Arimura, Osaka, JP;
Hiroyuki Kaizo, Osaka, JP;
Yutaka Yamada, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An electric power tool includes a motor; a speed reducer for transferring a rotational power of the motor at a reduced speed; and a reduction ratio changing unit for changing a reduction ratio of the speed reducer. The speed reduction mechanism includes an axially slidable changeover member and a gear member, the changeover member being engaged with or disengaged from the gear member depending on an axial slide position thereof. The reduction ratio changing unit includes a shift actuator for axially sliding the changeover member, a driving state detector for detecting a driving state of the motor, a slide position detector for detecting a slide position of the changeover member and a controller for driving the shift actuator and for changing a drive control of the shift actuator depending on detection results of the slide position detector unit and the driving state detector unit, respectively.