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