The eccentric 17 engages the toggle lever system in {HEAD ~ the area} of {TAIL ~ the joint} 18, at which the toggle links 13a, 13b are pivotally connected together 
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The eccentric 17 engages the toggle lever system in { HEAD ~ the area } of { TAIL ~ the joint } 18 , at which the toggle links 13a , 13b are pivotally connected together
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH