Electricity: motive power systems – Automatic and/or with time-delay means – Responsive to thermal conditions
Reexamination Certificate
2009-11-10
2011-12-27
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Responsive to thermal conditions
C318S473000, C318S471000, C318S445000
Reexamination Certificate
active
08084981
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.
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The Japanese office action dated Feb. 22, 2011 and English summary thereof, 5 pages total.
The Japanese Office Action dated Sep. 21, 2010 and English summary thereof.
Ikeda Masaki
Kubota Atsumasa
Miwa Tatsuya
Nishii Kazuhiko
Toyama Kazuto
Bacon & Thomas PLLC
Luo David
Panasonic Electric Works Power Tools Co., Ltd.
Ro Bentsu
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