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 a direction perpendicular to {HEAD ~ a rotation axis} of {TAIL ~ the rotation} 
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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 a direction perpendicular to { HEAD ~ a rotation axis } of { TAIL ~ the rotation }
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