| 摘要 |
To provide a diametrically expanded groove cutting apparatus capable of simultaneously cutting a plurality of diametrically expanded annular grooves on an inner peripheral wall of an anchor prepared hole for planting an anchor bar therein, and to provide an expandable mechanism used in the diametrically expanded groove cutting apparatus. A diametrically expanded groove cutting apparatus (11) comprising: a main body portion (12) including a shank (12a) to be coupled to an electrical device; an intermediate expandable mechanism (13) and a tip end side expandable mechanism (14) disposed along an axial direction so as not to rotate with respect to the main body portion (12), the electrical device applying an axial rotation to the diametrically expanded groove cutting apparatus (11) to cause the diametrically expanded groove cutting apparatus (11) to be able to cut upper and lower diametrically expanded annular grooves (3) on an inner peripheral wall of an anchor prepared hole (2) for planting an anchor bar therein by using cutting blades (8) disposed on the expandable mechanisms (13) and (14), wherein: the diametrically expanded groove cutting apparatus (11) is extensible; and the cutting blades (8) diametrically expand or contract by a retracting operation or an extending operation of the diametrically expanded groove cutting apparatus (11). |
