Impact tool

Japanese Patent JP6032289

B2

The purpose of the present invention is to provide an impact tool capable of performing high torque fastening operation by driving a motor efficiently while limiting temperature increase. An impact tool with a control means for controlling the driving power supplied to a motor using semiconductor switching elements and an impact mechanism for continuously or intermittently driving a tip tool using the rotational force of the motor, wherein during a single operation (period t0 - t9) from when an operator pulls a trigger until release of same, the control means varies the PWM drive signal for driving the semiconductor switching elements to perform control so as to intermittently manifest high duty impacts (62a, 63a ...) resulting from high duty ratio (100%) control between low duty impacts (62b, 62c, 63b, 63c ...) resulting from low duty ratio (80%) control. The control means monitors the motor electric current (80) and when a threshold (11) is exceeded, makes the duty ratio 100% and when a threshold (I2) is subsequently exceeded two times, switches the duty ratio to (80%).

WO/2005/059378	HOLDING STRAP FOR CURVED SCREWSTRIP
JP2022537982	Power tools and torque-responsive gear units for power tools
JP7365630	Electric tool

Nobuhiro Takano
Tomomasa Nishikawa
Kazutaka Iwata
Yoshihiro Hoshi

JP2014550170A

November 24, 2016

November 25, 2013

Click for automatic bibliography generation  

Hitachi Koki Co., Ltd.

B25F5/00; B25B21/02

JP2013252579A	2013-12-19
JP2001246574A	2001-09-11
JP2000210877A	2000-08-02
JP2005324264A	2005-11-24
JP2011240441A	2011-12-01
JP2009050932A	2009-03-12
JP2011016210A	2011-01-27
JP2009269139A	2009-11-19
JP2013252579A	2013-12-19
JP2001246574A	2001-09-11
JP2000210877A	2000-08-02
JP2005324264A	2005-11-24
JP2011240441A	2011-12-01
JP2009050932A	2009-03-12
JP2011016210A	2011-01-27

Aoritsu patent business corporation
Shinichi Kakubo

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