To provide a slip-off preventive structure of a fastener capable of being embodied in a simple constitution.
The slip-off preventive structure of the fastener is configured so that its fixing screw 2 is composed of a shank 21 to be fastened to a member for engagement and a head part 22 having a fastening force transmitting part. The shank part 21 is furnished at the end with a threaded portion 2A, and the non-threaded portion 2B between the head part 22 and the threaded portion 2A has a diameter d1 smaller than the bottom diameter of the threaded portion 2A. A fixation hole 11 to admit insertion of the fixing screw 2 is formed in each object 1, and is furnished with a pair of inclining projections 1A and 1B in the shape of a circular arc arranged confronting capable of engaging with the threaded portion 2A. When the threaded portion 2A is engaged with the projections 1A and 1B and allowed to pass through, the non-threaded portion 2B is held by the projections 1A and 1B in such a way as capable of being fitted loosely. Even if the object 1 is tumbled, the threaded portion 2A of the fixing screw 2 is hindered by the projections 1A and 1B, and the screw will not slip off easily.
INOUE AZUSA
Kazuko Fujita
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