How a Retractable Ballpoint Pen Works
A ballpoint pen seems simple: press a button you can write, press again and put it in your pocket. Yet inside a clever mechanisms turns that simple push into all sorts of other motions. This video uses detailed animation to look inside the iconic Parker Jotter ink pen and see how it works. You can become an advanced viewer of engineerguy videos by signing up at http://www.engineerguy.com/preview.