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