SPROKETS

A sprocket is a profiled wheel with teeth, or cobs, that mesh with a chain, track or other perforated or indented material. The name ‘sprocket’ applies generally to any wheel upon which radial projetions engage a chain passing over it. Sprockets are used in bicycles, motor cycles, cars, tracked vehicles, and other machinery either to transmit rotary motion between two shafts where gears are unsuitable or to impart linear motion to a track, tape etc. Sprockets are of various designs.