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