Wheel and Axle
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.
Here are all 6 simple machines in a Rube Goldberg. Just watch the first half:
Just for Fun:
FOR SOME REAL LIFE EXAMPLES AND MORE INFORMATION GO TO: http://www.home-elevator.net/info-elevator-mechanics.php