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:
Jan. 01, 2013
Filed:
Nov. 10, 2009
Tatsuya Miwa, Maibara, JP;
Atsumasa Kubota, Hikone, JP;
Masaki Ikeda, Hikone, JP;
Kazuhiko Nishii, Omihachiman, JP;
Tatsuya Miwa, Maibara, JP;
Atsumasa Kubota, Hikone, JP;
Masaki Ikeda, Hikone, JP;
Kazuhiko Nishii, Omihachiman, JP;
Panasonic Electric Works Power Tools Co., Ltd, Hikone, Shiga, JP;
Abstract
A rechargeable electric power tool includes a motor driven by a secondary battery, a switching element for regulating power distribution to the motor, a motor control unit for controlling rotation of the motor through the switching element, a lead wire for supplying a drive current to the motor therethrough and a trigger switch changed over by a user for turning on or off the drive current supplied to the motor through the lead wire. In the rechargeable electric power tool, upon changeover of the trigger switch, a microcomputer determines a magnitude relation between a detected temperature outputted from a first thermistor and a first temperature threshold value. If the detected temperature is determined to be greater than the first temperature threshold value, the microcomputer is set in a limited operation mode in which a revolution number of the motor is limited to a predetermined value or less.