A simple lever could be a solid beam laid across a pivot. As effort is applied to rotate one end about the pivot, the opposite end is also rotated about the pivot in the same direction.

In this case, panoramah!® presents Pivot, an opening system that functions by means of a pivoting component with a central or side rotation axis. Through this system, large glass surfaces are ...

A simple lever could be a solid beam laid across a pivot. As effort is applied to rotate one end about the pivot. The opposite end is also rotated about the pivot in the same direction.