It is also present in some fish jaws that evolved to take advantage of the force multiplication that the four bar mechanism can provide. Deployable mirror with scissor linkages. By [Catsquisher ...

Consider the mechanism shown below made up of moveable links AB, BD and DE. Link AB is rotating CCW at a constant rate. Point C is the center of rotation for BD, where point C is at the intersection ...

Of course he didn’t (YouTube). Instead, he wrote a simulator that lets him try out various custom linkages in real time. It’s a Windows-only application (sigh), but it’s free to use ...