How to draw

Knuckle joint is used for connecting two rods whose axes either coincide or intersect and lies in one plane only. They are widely used in tractor trailer, tie rod in roof truss, joint between the links of suspension bridge and also used in steering system in between the steering rod and pinion of the steering gear. It is a mechanical joint used to connect two rods which are under a tensile load, when there is a requirement of small amount of flexibility, or angular moment is necessary.