Ratchets and pawls are mechanical assemblies that are accustomed to transmit intermittent rotary motion, or to permit a shaft to rotate in a single direction however, not the other. Ratchets and pawls are usually made 
of:
steel
stainless steel
cast iron
brass
other metal materials
Features
Ratchets are occasionally called ratchet wheels because they consist of a rotating Pawls For Ratchets Wheel equipment or rack with angled the teeth. Pawls, which are sometimes misidentified as ratchets, are slim protrusions that relax against a ratchet to restrict its movement. When the ratchet is certainly rotated in one direction, the pawl is elevated and moves smoothly between the angled tooth. When the ratchet’s rotation stops, the pawl rests between the the teeth and makes a clicking noise. Ratchets and pawls that permit rotation in mere one direction trigger the pawl and the teeth to clash if the ratchet is certainly turned the contrary way.
Pawl
Applications
Applications for these single-direction devices include:
turnstiles
spanners
winders
jacks
The action of a ratchet can be either harsh or smooth, based on the configuration of the ratchet teeth and pawl.
