A ratchet is a mechanical gadget which allows continuous linear or rotary motion in mere one direction while avoiding motion in the opposite direction. Ratchets are trusted in machinery and tools. A rachet contains a round equipment or a linear rack with tooth, and a pivoting, spring-loaded finger known as a pawl (or click, in clocks and watches) that engages the teeth. One’s teeth are uniform but asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the various other edge.
When the teeth are relocating the unrestricted (i.e. forward) direction, the pawl very easily slides up and over the carefully sloped edges of the teeth, with a springtime Ratchets Wheel forcing it (often with an audible ‘click’) in to the depression between the teeth since it passes the tip of every tooth. When the teeth move in the contrary (backward) direction, nevertheless, the pawl will capture against the steeply sloped advantage of the first tooth it encounters, thereby locking it against the tooth and avoiding any further motion in that direction.
Angle of teeth 60°
Heat treatment Induction hardened teeth
Tooth hardness 50 ～ 60HRC