FACTOID # 30: Finns are perhaps the world's greatest athletes, ranking first in medals per capita for Summer Olympics, and third for Winter Olympics.
 
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Encyclopedia > Crank (mechanism)

A crank is a bent portion of an axle, or shaft, or an arm keyed at right angles to the end of a shaft, by which motion is imparted to or received from it; also used to change circular into reciprocating motion, or reciprocating into circular motion. Familiar examples of a crank for manual use include the crank on a manual pencil sharpener and the cranks on the pedals that drive a bicycle.


Cranks were formerly common on some machines in the early 20th century; for example almost all phonographs before the 1930s were powered by clockwork motors wound with cranks, and internal combustion engines of automobiles were usually started with cranks before electric starters came into general use.


See also crankshaft.


  Results from FactBites:
 
Crank mechanism - Patent 5749262 (4503 words)
A crank mechanism as claimed in claim 1, wherein the axis of the piston is offset from the axis of the output shaft by a distance equal to substantially half o.backslash.the stroke of the associated piston.
A crank mechanism as claimed in claim 14, wherein the axis of each piston is offset from the axis of the output shaft by a distance equal to substantially half the stroke of the associated piston.
A crank mechanism as claimed in claim 21, wherein the three torque lobes associated with each bank of three cylinders are all fixed to the output shaft in such a manner that the lines joining the centre of the output shaft to the centres of said torque lobes are angled to one another by 120.degree..
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