A ratchet is a mechanical device which Ratchets Wheel allows continuous linear or rotary movement in only one direction while stopping motion in the opposite direction. Ratchets are widely used in machinery and 
tools. A rachet consists of a round equipment or a linear rack with the teeth, and a pivoting, spring-loaded finger known as a pawl (or click, in clocks and watches[1][2]) that engages one’s teeth. One’s teeth are uniform but asymmetrical, with each tooth having a moderate slope using one edge and a much steeper slope on the other edge.
When the teeth are moving in the unrestricted (i.electronic. forward) path, the pawl very easily slides up and over the softly sloped edges of the teeth, with a spring forcing it (often with an audible ‘click’) in to the depression between the teeth as it passes the suggestion of every tooth. When the teeth move in the contrary (backward) direction, nevertheless, the pawl will catch against the steeply sloped advantage of the 1st tooth it encounters, thereby locking it against the tooth and stopping any further motion in that direction.
Specifications
Angle of teeth 60°
Material S45C
Heat therapy Induction hardened teeth
Tooth hardness 50 ～ 60HRC