wheel axle

wheel and axle

noun
a simple machine consisting, in its typical form, of a cylindrical drum to which a wheel concentric with the drum is firmly fastened: ropes are so applied that as one unwinds from the wheel, another rope is wound on to the drum.

Origin:
1765–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wheel and axle
 
n
a simple machine for raising weights in which a rope unwinding from a wheel is wound onto a cylindrical drum or shaft coaxial with or joined to the wheel to provide mechanical advantage

Collins English Dictionary - Complete & Unabridged 10th Edition
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