Patent ID: 9021921
Filing Date: 2015-05-05
Classification: B25B

Abstract:
1. A torque wrench comprising a cam-type torque detection mechanism, the torque detection mechanism having: a rotatable drive spindle for transmitting tightening force to a tightened member, a tubular cam disposed rotatably around the drive spindle via a ratchet mechanism and provided on its outer circumferential surface with a cam portion, and a roller member actuated by a resilient member to abut retreatably against the cam portion, the roller member being subjected to the tightening force, the torque wrench characterized in that the cam portion has a static engagement cam surface for engagement in a non-operated status by the roller member in a static status, and a gradually increasing torque peak cam surface which is connected to the static engagement cam surface and with which the roller member is brought into contact while moving to thereby gradually increase a torque peak.