Fastener, Male-Screw-Side Member, and Female-Screw-Side Member

Abstract

Provided is a fastener capable of shortening the time required for fastening. The fastener includes: a male-screw-side member having a screw portion (11), the screw portion (11) being formed by alternately arranging male screw surfaces (12A, 12B) where male screw-side screw threads (12) are formed and outer peripheral pieces (13A, 13B) where the male screw-side screw threads (12) are not formed; and a female-screw-side member (20) having a screw hole (21), the screw hole (21) being formed by alternately arranging female screw surfaces (22A, 22B) where female screw-side screw threads (22) are formed and inner peripheral pieces (23A, 23B) where the female screw-side screw threads (22) are not formed, the screw hole (21) allowing the male screw surfaces (12A, 12B) and the female screw surfaces (22A, 22B) to be threadedly engaged with each other. The male screw-side screw threads (12) are formed in such a manner that a width in a radial direction of the screw portion (11) increases from a front side in a relative rotation direction toward a rear side during a thread engagement between the male screw surfaces (12A, 12B) and the female screw surfaces (22A, 22B). The female screw-side screw threads (22) are formed in such a manner that a width in a radial direction of the screw hole (21) decreases from the front side in the relative rotation direction toward the rear side.

Dependencies are inferred from the claim text.