| 摘要 |
A fitting member is provided with a base having a flat portion, a stopper protruding forward from the base, and a through hole provided in a flat portion, wherein a knob has a plurality of projections positioned on the same circle. In fitting the knob to the fitting member, when the knob is rotated while being pressed backward in a state in which the projections are kept in contact with the flat portion, the projections slice on and in friction with a flat face, and when the projections hit against the stopper and the rotation of the knob is stopped, the projections and the through hole become opposite each other. After the projections are fitted into the through hole, the knob and the fitting member are enabled to be coupled to each other.
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