| 摘要 |
PROBLEM TO BE SOLVED: To provide an anchor with a screw configured to cause less resistance during drilling a prepared hole with respect to a base material, and to eliminate backlash in a fixed state to the base material and reduction of a load support strength.SOLUTION: An anchor 1 with a screw has a male screw 2 on its outer periphery, and is configured such that a separation part 3a divided into two by a slit 6 of a tubular shaft part 3 provided with a drilling part 4 at its front end and a head part 5 at its rear end is push-opened by screwing of a screw 8 to divide the drilling part 4. The drilling part 4 is formed with a pair of cutting blade plates 11 extended forward in an axial direction from positions on both sides with the slit 6 sandwiched therebetween, at a front end of the separation part 3a, and a pointed front part 12 for joining front ends of the both cutting blade plates 11. The cutting blade plate 11 is formed in a cross-section shape in a substantially sector shape, by an arc-shaped outer surface 13 matched to an outer peripheral surface of a hollow shaft part 3, a cutting front guide surface 15 extended to the radial inside from a front edge in a screwing rotation direction of the arc-shaped outer surface 13, and an escape surface 16 for chips reaching from an inner end of the cutting front guide surface 15 to a rear edge in a screwing rotation direction of the arc-shaped outer surface 13. |
