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Old 11-04-2018, 08:39 AM   #1 (permalink)
 
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Default Safety Pen

This is a pen I made a couple weeks ago as more of an experiment and engineering exercise to get to know my new lathe. The mechanism of this pen is inspired by an old design, in which the nib remains retracted in the barrel while the pen is capped, and not in use. When the pen is going to be used, it is uncapped,and the user twists the knob on the back of the pen to extend the nib for writing.

The design is called a "safety pen" because when the pen is capped, there is a plug inside the cap that completely seals the barrel off, making the pen leak-proof no matter how much you throw the pen around. The pen is filled with an eyedropper, and the downside of the design is that if you uncap the pen while not in a vertical position, the ink will spill out of the barrel (so don't give the pen to someone who doesn't know what it is!).

I used tortoise shell acrylic for the cap and body, titanium and ebonite for the mechanism, and bronze for the clip. I used a random vintage gold nib I had laying around.

This was a fun project, and something I had wanted to try for a while.
Here is a video of the mechanism:
https://www.instagram.com/p/Boo66UPjUUf/
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Old 11-04-2018, 08:55 AM   #2 (permalink)
 
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Awesome work.
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Old 11-04-2018, 08:56 AM   #3 (permalink)
 
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Thanks Jim
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Old 11-04-2018, 10:30 AM   #4 (permalink)
 
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Beautiful work. I like the threading forward of the section. Did you machine the spiral and the mechanism on nib? Excellent engineering.


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Old 11-04-2018, 10:37 AM   #5 (permalink)
 
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Quote:
Originally Posted by Penultimate View Post
Beautiful work. I like the threading forward of the section. Did you machine the spiral and the mechanism on nib? Excellent engineering.


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Thanks Mike. I machined all the parts except for the nib and feed.
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Old 11-04-2018, 10:54 AM   #6 (permalink)
 
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Amazing work John. Very excellent.
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Old 11-04-2018, 11:03 AM   #7 (permalink)
 
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Very nice John.
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Old 11-04-2018, 03:36 PM   #8 (permalink)
 
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Awesome and beautiful! It’s the first one I’ve seen like that.
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Old 11-04-2018, 03:44 PM   #9 (permalink)
 
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It's always a pleasure to see your work. Excellent as usual.
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Old 11-04-2018, 04:10 PM   #10 (permalink)
 
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I was fortunste to see this in person. Its an amazing pen. Again, great job John
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