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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 means a split pin.
Typical applications are in fixing a crank to its crankshaft, as in a bicycle, and a
Cottered Cranks by Sheldon Brown
Bicycle parts Fasteners
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 means a split pin.
Typical applications are in fixing a crank to its crankshaft, as in a bicycle, and a piston rod
In a piston engine, a piston rod joins a piston to the crosshead and thus to the connecting rod that drives the crankshaft or (for steam locomotives) the driving wheels.
Internal combustion engines, and in particular all current automobile engin ...
to a crosshead, as in a steam engine. 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 awasher
Washer most commonly refers to:
*Washer (hardware), a thin usually disc-shaped plate with a hole in the middle typically used with a bolt or nut
*Washing machine, for cleaning clothes
Washer may also refer to:
*Dishwasher, a machine for cleani ...
and nut
Nut often refers to:
* Nut (fruit), fruit composed of a hard shell and a seed, or a collective noun for dry and edible fruits or seeds
* Nut (hardware), fastener used with a bolt
Nut or Nuts may also refer to:
Arts, entertainment, and media Co ...
. They are also used to secure ceiling fans to prevent falling if the mounting nut loosens.
See also
* * * * *References
{{ReflistExternal links
Cottered Cranks by Sheldon Brown
Bicycle parts Fasteners