| 摘要 |
PROBLEM TO BE SOLVED: To provide a low cost screw member, a fastening device with the screw member and an image forming device wherein operability is equivalent to a general-purpose screw in an initial fastening stage of meshing, breakage and loosening at the time of meshing a male screw and a female screw are prevented or positioning is always made stable while being in a light fastening fit state by an elastic force of a contact part of the male screw and the female screw from the vicinity of a fastening end or being in a state of filling a gap between the male screw and the female screw. SOLUTION: A screw part 2 formed at the outer circumference or the inner circumference of a screw body 1, a general-purpose screw 3 formed at a tip side with which the screw 2 firstly meshes when fastening, and a loosening-preventive screw 4 formed at the other end side of the general-purpose screw 3 for meshing secondly are provided. COPYRIGHT: (C)2007,JPO&INPIT
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