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Cotter (pin)
A cotter is a pin or wedge passing through a hole to fix parts tightly together. In British usage cotter pin has the same meaning,〔.〕 but in the U.S. it refers to a different fastener.
Typical applications are in fixing a crank to its crankshaft, as in a bicycle, or a piston rod to a crosshead, as in a steam engine. Note: the angle of the wedge determines the position of the parts being held, therefore on a bicycle the pedal arms will only be at 180 degrees to each other if the angle of the cotter pin's wedge is the same on both pins.
==Popular usage==
Formerly, it was common to mount bicycle cranks using a cotter, though now usually a more easily maintained arrangement is used such as a square tapered or splined interface. These cotters have a short threaded section at the narrower end of the taper, which is used to hold the cotter in place with a washer and nut.
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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