ROTATION TOOL INSTALLATION AND REMOVAL DEVICE AND SAID ROTATION TOOL

摘要

Provided is a rotation tool or the like such that even if high rotational torque acts, plastic deformation does not tend to occur. A rotation tool (B) is configured in such a way that the tip section is provided with a blade section (14) wherein an edge is disposed in such a way as to face in the direction of the tip section; that the base end section is provided with a shank section (11) which is mounted in a mounting hole (1) in an arbor (A); that the shank section (11) is provided with an engagement recess (15) which engages with an anchoring member (2) that is disposed in the arbor in such a way as to be capable of protruding radially inward from the mounting hole (1), and a passage recess (18) capable of introducing the anchoring member into the engagement recess (15); and that thereby the rotation tool (B) is prevented from coming out of the arbor (A). A groove (16) with which a protrusion (3) formed in the mounting hole (1) in the arbor (A) engages in a surface contact manner, is formed in that area of the section (11) where the engagement recess (15) is not formed or where the same is formed.