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:
Dec. 27, 2011
Filed:
Nov. 10, 2009
Tatsuya Miwa, Maibara, JP;
Kazuhiko Nishii, Omihachiman, JP;
Atsumasa Kubota, Hikone, JP;
Kazuto Toyama, Hikone, JP;
Masaki Ikeda, Hikone, JP;
Tatsuya Miwa, Maibara, JP;
Kazuhiko Nishii, Omihachiman, JP;
Atsumasa Kubota, Hikone, JP;
Kazuto Toyama, Hikone, JP;
Masaki Ikeda, Hikone, JP;
Panasonic Electric Works Power Tools Co., Ltd., Hikone, Shiga, JP;
Abstract
In a rechargeable electric power tool, upon changeover of a trigger switch, a microcomputer determines the magnitude relation between the detected temperature outputted from the first thermistor and the first temperature threshold value, the second temperature threshold value and the third temperature threshold value, and the magnitude relation between the first calculated temperature increase rate and the first preset temperature increase rate. If the detected temperature is determined to be greater than the first temperature threshold value or if the first calculated temperature increase rate is determined to be greater than the first preset temperature increase rate after the detected temperature has been determined to be greater than the second temperature threshold value, the microcomputer is set in a limited operation mode in which the revolution number of the motor is limited to a predetermined value or less.