A picture is like 1000 words, imagine an animation! Here is a very interesting site, that has some clear and nice animations with some complicated mechanisms. The goal of these animations is to understand how they work. The mechanism showed above, is used in the cars to connect the steering wheels with the drive shaft. Here are some more interesting ones: [ even more in the original site ]
How the sewing machine works: I was trying to understand how this mechanism works. No words to say, just watch the ingenious:
How the gear box works: Although i know how it works, i like the way this animations represents it. Watch:
How the rotary engines work (AKA Wankel): Isn't it much easier to understand with a nice animation???