These are examples of wheel and axles.
The wheel and axle is a simple machine.
The traditional form as recognised in 19th century textbooks is as shown in the image. This also shows the most widely recognised application, i.e., lifting water from a well. The form consists of a wheel that turns an axle and in turn a rope converts the rotational motion to linear motion for the purpose of lifting.
By considering the machine as a torque multiplier, i.e., the output is a torque, items such as gears and screwdrivers can fall within this category.
