TIGHTENING DEVICE

WIPO Patent Application WO/2020/121549

A1

[Problem] The purpose of the present invention is to provide a tightening device which can fasten a fastening element by a target tightening force with good accuracy and facilitates automation. [Solution] This tightening device is characterized by comprising: a drive socket which is cylindrical and holds a nut in the lower end opening thereof; a nut holder which is a bottomed cylinder that is disposed inside the drive socket, through the bottom of which a bolt is passed, and which regulates the movement of the nut held by the drive socket toward the tip end of a threaded part by means of said bottom; a tension rod which is disposed inside the nut holder and the lower end face of which has a threaded hole into which a portion of the threaded part that is further on the tip end side than the nut is screwed; a sensor for detecting tension force; a first motor for turning the tension rod around an axis that extends in the vertical direction; and a second motor for turning the drive socket around an axis that extends in the vertical direction.

JPH0970766	STUD BOLT DRAWING TOOL
JP7271444	Device for tightening threaded fasteners
JP5132350	Tire tightening machine

OGATA TOMOHIRO (JP)
KOMATSU KYOICHI (JP)
ITO SEIJI (JP)

PCT/JP2019/019249

June 18, 2020

May 15, 2019

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TOHNICHI MFG CO LTD (JP)

B25B21/00; B23P19/06; B25B23/14; B25B23/147; F16B31/04

JPH1015752A	1998-01-20
JP2008151310A	2008-07-03
JP4363661B2	2009-11-11
EP2871027A1	2015-05-13
DE2328444A1	1975-01-02
JP2003240655A	2003-08-27
JP4363661B2	2009-11-11
JP4028254B2	2007-12-26

See also references of EP 3785856A4

MIZUNO, Katsufumi et al. (JP)

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