Linkages and Joints for robotics-4

LEVERS
(Fulcrum is referred to support)

Class 1: fulcrum is between load and effort.

Class 2: load is between fulcrum and effort

Class3: effort is between fulcrum and load

ROCKER ARM

It has an input and output arm which rock around a fulcrum point. It act as a first class lever, it converts linear motion to an opposed linear motion. As the cam rotates the input arm (A) oscillate and it leads to opening of valve at (C) through the output arm (B). (It is used in cam shaft of cars to open the valves of engine, read www.carbibles.com for more).
BELL CRANK