Title:
ROTARY IMPACT TOOL
Document Type and Number:
WIPO Patent Application WO/2017/122592
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a rotary impact tool that is able to limit reduction in tightening performance while reducing temperature elevation of the motor and a switching element and reducing the current flowing to the motor and switching element, and is easy to use. A rotary impact tool is provided with: a motor; a tip tool holder that is driven by the motor; an impact mechanism section that is provided in the motive power transmission pathway from the motor to the tip tool holder and is configured to intermittently generate rotary impact for transmitting the driving force of the motor to the tip tool holder; a switching element for switching the voltage supplied to the motor; and a control unit for controlling the switching element. The control unit is configured so that the voltage supplied to the motor from completion of a first rotary impact until initiation of a second rotary impact, which follows the first rotary impact, begins gradually to increase.
Inventors:
HARADA TETSUHIRO (JP)
NISHIKAWA TOMOMASA (JP)
ITO TATSUYA (JP)
HIRAI TAKAHIRO (JP)
LI YANG (JP)
NISHIKAWA TOMOMASA (JP)
ITO TATSUYA (JP)
HIRAI TAKAHIRO (JP)
LI YANG (JP)
Application Number:
PCT/JP2017/000276
Publication Date:
July 20, 2017
Filing Date:
January 06, 2017
Export Citation:
Assignee:
HITACHI KOKI KK (JP)
International Classes:
B25B21/02
Foreign References:
| JP2013252579A | 2013-12-19 | |||
| JP2009072889A | 2009-04-09 | |||
| JP2013146847A | 2013-08-01 | |||
| JP2016078230A | 2016-05-16 |
Other References:
See also references of EP 3406404A4
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