HOLLOW SCREW, DEVICE FOR MANUFACTURING HOLLOW SCREW AND PROCESS FOR MANUFACTURING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a hollow screw which is improved in workability by adding lock function to the hollow screw itself and can realize the reduction in weight without reducing the strength of a screw part and the like; a device for manufacturing the hollow screw; and a process for manufacturing the same.;SOLUTION: The hollow screw is configured to have a screw axis part 11 having a hollow hole 13, a first screw part 16 with a predetermined pitch P provided in this axis part 11, a second screw part 17 provided in a position distant by a predetermined distance from the first screw part 16, having the same pitch P as that of the first screw part, and deviated in phase with respect to the first screw part, and an annular recessed part 18 provided between the first screw part 16 and second screw part 17 of the axial part 11 and having a diameter smaller than the outer diameters of the first screw part 16 and the second screw part 17.;COPYRIGHT: (C)2005,JPO&NCIPI