The four bar linkage is a parallelogram type linkage which enables the jogger plate to maintain its orientation in space regardless of {HEAD ~ any swinging movement} experienced by {TAIL ~ the parallelogram linkage} 
experienced by
The four bar linkage is a parallelogram type linkage which enables the jogger plate to maintain its orientation in space regardless of { HEAD ~ any swinging movement } experienced by { TAIL ~ the parallelogram linkage }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL