The engagement device includes an axis protrusion provided on one side of either the movable side portion or {TAIL ~ the base}, and a receiving portion provided on the other side of either the movable side portion or the base, and receiving {HEAD ~ the axis protrusion} from a direction perpendicular to a rotation axis of the rotation 
The engagement device includes an axis protrusion provided on one side of either the movable side portion or { TAIL ~ the base } , and a receiving portion provided on the other side of either the movable side portion or the base , and receiving { HEAD ~ the axis protrusion } from a direction perpendicular to a rotation axis of the rotation
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