The engagement device includes an axis protrusion provided on {HEAD ~ 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 the axis protrusion from a direction perpendicular to a rotation axis of the rotation 
The engagement device includes an axis protrusion provided on { HEAD ~ 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 the axis protrusion from a direction perpendicular to a rotation axis of the rotation
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH