Nut tightening machine

A technology for fastening machines and nuts, applied in the direction of screwdrivers, motor tools, light motorized devices, etc.
CN106660197AActive Publication Date: 2017-05-10MAKITA CORP
7 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MAKITA CORP
Publication Date
2017-05-10

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Abstract

An operation switch (33) sends an ON signal, indicating to switch ON, to a control processing device (71). A magnetic sensor (67) sends sensor signals to the control processing device (71) on the basis of displacement to the rear side of a tip rod. The control processing device (71) performs first mode control whereby a brushless DC motor (22) is not driven, if no sensor signal has been sent. The control processing device performs second mode control whereby the brushless DC motor (22) is driven, if a sensor signal has been sent. Output in this first mode is lower than the output in the second mode. As a result, power consumption efficiency is improved for power that is supplied when the nut tightening machine is switched on but is not tightening hexagonal nuts, even if a manual ON input by a user remains ON.
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Description

technical field

[0001] The present invention relates to a nut tightening machine for tightening nuts to bolts. Background technique

[0002] In recent years, bolts called torsional shear bolts (hereinafter referred to as "shear bolts") have been used for screw fastening in steel structures. The shear bolt utilizes a nut to complete thread fastening. The screw tightening by this nut is performed by two tightenings of main tightening and final tightening. For tightening such nuts, for example, a nut tightening machine referred to in JP 2009-297858 A is used. In addition, the above-mentioned turning-on operation of the nut tightening machine is performed by the pulling operation of the operation trigger provided on the tool main body.

[0003] However, nuts are sometimes continuously fastened to a plurality of shear bolts at construction sites. In such a case, it is troublesome to disconnect the above-mentioned nut tightening machines one by one. That is, when the nuts are...

Claims

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