Title:
充電式電動工具
Document Type and Number:
Japanese Patent JP4793425
Kind Code:
B2
Abstract:
In a rechargeable electric power tool (6), upon changeover of a trigger switch (5), a microcomputer (11) determines the magnitude relation between the detected temperature outputted from the first thermistor (9) and the first temperature threshold value (T th1 ), the second temperature threshold value (T th2 ) and the third temperature threshold value (T th3 ), 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.
Inventors:
Tatsuya Miwa
Kazuhiko Nishii
Atsushi Kubota
Toyama alone
Masaki Ikeda
Kazuhiko Nishii
Atsushi Kubota
Toyama alone
Masaki Ikeda
Application Number:
JP2008288074A
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