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Ratchet (device)
A ratchet is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools. Though something of a misnomer, "ratchet" is also often used to refer to ratcheting socket wrenches, a common tool with a ratcheting handle.
==Theory of operation==
A ratchet consists of a round gear (see Figure 1) or linear rack with teeth, and a pivoting, spring-loaded finger called a ''pawl'' (or ''click''〔http://www.hautehorlogerie.org/en/encyclopaedia/glossary-of-watchmaking/s/pawl-click/〕〔
〕) that engages the teeth. The teeth are uniform but asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge.
When the teeth are moving in the unrestricted (i.e., forward) direction (see Figure 2), the pawl easily slides up and over the gently sloped edges of the teeth, with a spring forcing it (often with an audible 'click') into the depression between the teeth as it passes the tip of each tooth. When the teeth move in the opposite (backward) direction, however, the pawl will catch against the steeply sloped edge of the first tooth it encounters, thereby locking it against the tooth and preventing any further motion in that direction.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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