The arch block 12 is a biased or forced by the spring 13 into engagement with the ratchet {HEAD ~ wheel} 11 to limit {TAIL ~ rotary motion} of the ratchet wheel 11 to one direction 
to limit
The arch block 12 is a biased or forced by the spring 13 into engagement with the ratchet { HEAD ~ wheel } 11 to limit { TAIL ~ rotary motion } of the ratchet wheel 11 to one direction
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH