Title:
充電式電動工具
Document Type and Number:
Japanese Patent JP4793426
Kind Code:
B2
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.
Inventors:
Tatsuya Miwa
Atsushi Kubota
Masaki Ikeda
Kazuhiko Nishii
Atsushi Kubota
Masaki Ikeda
Kazuhiko Nishii
Application Number:
JP2008288075A
Publication Date:
October 12, 2011
Filing Date:
November 10, 2008
Export Citation:
Assignee:
Panasonic Electric Works Co., Ltd.
International Classes:
B25F5/00
Domestic Patent References:
| JP2007222991A | ||||
| JP2006272485A | ||||
| JP2003311655A | ||||
| JP2003339187A |
Attorney, Agent or Firm:
Hironobu Onda
Makoto Onda
Makoto Onda