Tohnichi Mfg. Co., Ltd.

Naoya Masuda

Hiroshi Tsuji

Seiji Ito

Tomohiro Ogata

Shozo Aikawa

Kyo Kan

It is to provide a torque driver capable of bringing a marker into direct contact with a surface of a fastener member such as a screw to perform marking. A torque driveris configured such that a caseis rotated relative to a main shaftwhen a tightening force applied to the caseis transmitted to the main shaftthrough a torque limiter sectionand a tightening torque on a screwengaged with a bitattached to a couplerfixed at a tip portion of the main shaftreaches a torque value set in the torque limiter section. The torque driverincludes: a markerextending from an inside of the couplerto a tip portion of the bitalong a side surface of the bit; and a marker activating sectionthat allows the markerto move forward by utilizing rotation of the caserelative to the main shaftso that a marker tip portionis brought into contact with the screwto perform marking.

Torque driver

To make improvements in torque wrenches with a torque limiter that uses a cam mechanism and to provide a torque wrench that realizes more stable operation and is capable of highly precise tightening. In a torque wrench with a torque limiter that uses a cam mechanism, a solid columnar roller memberis engaged with a cam partof a cam shaftsuch that it is rotatably supported by a roller support lever membermounted in a head portionsuch as to be rotatable around a support shaftand such that it is pressed against the cam partby a spring force transmitting rodbiased by a torque setting spring. The roller support lever memberis configured such that the distance rfrom the support shaftto a point of application of force of the spring force transmitting rodis longer than the distance rfrom the support shaftto the roller member

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Tokyo, Japan

Naoya Masuda