Retractable ballpoint pen have emerged earlier. Most likely you are one of the many who have enjoyed using such pen which can be easily pressed when you want to write and press again when you put in in your pocket.
The pen uses a simple but clever mechanisms that enable you to write and eventually push back the pen.
Tiny as it may look like but what is inside a retractable ballpoint is a simple machine that could sort motions in just a push.
In this video, you will be even more surprised as this expert go through a detailed examination inside the iconic Parker Jotter ink pen and see how the simple press works. Hope you enjoy this.
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Video from Engineerguy