[Bill Hammack], aka the [EngineerGuy] is at it again, this time explaining how retractable ballpoint pens work. In this excellent video, he describes the simple (but remarkably sophisticated) engin… ...

The ballpoint pen was discovered to eliminate the irritation related to ... Now that you know the reason behind the inception of ballpoint pens, its time to discuss the core mechanism behind them.

Another fountain pen innovation from the period was found in U.S. Patent No. 293545, simply titled Fountain Pen.Issued to Lewis E. Waterman of Brooklyn, NY, the patent claims an ink-duct for a ...

This is a review of my current EDC pen: Zebra F-701 Stainless Steel Ballpoint Retractable Pen, Black Ink, Fine Point, PK ... Quiet plunger mechanism silences any clicking when you retract.

[u407]’s 3D printed Signspinner was created as a clean/dirty indicator for a dishwasher, and at its heart is a mechanism that works a lot like that of a retractable ballpoint pen. Every click… ...

But to create the ballpoint mechanism himself — as György Moldova recounted in his 2012 book Ballpoint — Biro was inspired by something much less technologically advanced: a child playing ...