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