A concaved area 35 is defined in the inner periphery of the ring 30 and when {HEAD ~ the two pawls} 51 are located in {TAIL ~ the concaved area} 35, the ratchet teeth 512 extend outward as shown in FIG 4 
are located in
A concaved area 35 is defined in the inner periphery of the ring 30 and when { HEAD ~ the two pawls } 51 are located in { TAIL ~ the concaved area } 35 , the ratchet teeth 512 extend outward as shown in FIG 4
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH