wheel and axle

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A simple machine consisting of an axle to which a wheel is fastened so that torque applied to the wheel winds a rope or chain onto the axle, yielding a mechanical advantage equal to the ratio of the diameter of the wheel to that of the axle.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a simple machine consisting of a wheel (or similar lever) that turns an axle around which a cord is wound; its mechanical advantage is the ratio of the diameters of the wheel and axle

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun hoist so arranged that a rope unwinding from a wheel is wound onto a cylindrical drum or shaft coaxial with the wheel