Fosfor Iris

[manojd]

For the past several months, I have been working on a capless safety pen concept. The basic workings of a safety pen are quite simple. But I wanted a workable solution for the capless part of the pen. After months of tinkering, here is the first prototype:

 

 

 

 

The pen uses standard size 5 nib units and standard converter.

 

Nib mechanism is actuated by the end knob.

 

The clip is solid sterling silver cast.

 

Looking forward to comments and feedback.

[Lloyd]

Cool implementation! It looks like a leaf shutter.. How secure is it; can the lever turn unintentionally?

[Mech-for-i]

interesting concept but the lens aperture style blades seems not to close entirely , I am skeptical about if its able to fully seal the nib when not in use. I known of similar setup used in industrial application but the generally use rubberized coating on the blade with heavy oiled lubing and the blades close entirely. I would wager also a twist ring would be better than a bolt style knob

[fpwriter]

 

This is refreshingly new! Since this is just the first prototype I understand that further fine tuning of the design must be underway. I guess I will have to drive down to Pune soon

 

Cheers!

Kshitij

Edited July 17, 2018 by KshitijShetty

[manojd]

Cool implementation! It looks like a leaf shutter.. How secure is it; can the lever turn unintentionally?

Thanks. It is an iris diaphragm. It seems to be quite stable.

[manojd]

interesting concept but the lens aperture style blades seems not to close entirely , I am skeptical about if its able to fully seal the nib when not in use. I known of similar setup used in industrial application but the generally use rubberized coating on the blade with heavy oiled lubing and the blades close entirely. I would wager also a twist ring would be better than a bolt style knob

I have been searching hard for a zero aperture diaphragm. But the size does not match. I even tried designing my own. This iris has a 1mm hole. In my testing so far, I have observed that if I use the pen everyday then the nib doesn't dry out and only requires a push start at the beginning of the day. If the pen is left unused for longer than a day then the nib will dry out.

 

I certainly welcome ideas for a sealable hatch. I spent hours in trying to figure out an automatic hatch that would open and close. But it's easier said than done.

[manojd]

This is refreshingly new! Since this is just the first prototype I understand that further fine tuning of the design must be underway. I guess I will have to drive down to Pune soon

 

Cheers!

Kshitij

You are welcome any time.

[SoulSamurai]

That's very cool! A unique idea that seems very well executed!

 

While I love what you've come up with for the novelty and ingenuity, I wonder if the Pilot Capless "trapdoor" style seal wouldn't work better overall? I don't know how hard it would be to manufacture of course.

 

BTW I take it the nib extends and retracts as you twist the body? I wonder if it's possible to have the iris open and close as you twist the body rather than needing to be opened in a separate action? I imagine it would probably be very hard to build a robust system to transmit the rotation of the body to the iris in such a small area though.

 

Anyway, I would love to see some WIP photos if you don't mind sharing your process?

[Inspector]

Hats off for trying to do something that few attempt or succeed at.

[manojd]

That's very cool! A unique idea that seems very well executed!

 

While I love what you've come up with for the novelty and ingenuity, I wonder if the Pilot Capless "trapdoor" style seal wouldn't work better overall? I don't know how hard it would be to manufacture of course.

 

BTW I take it the nib extends and retracts as you twist the body? I wonder if it's possible to have the iris open and close as you twist the body rather than needing to be opened in a separate action? I imagine it would probably be very hard to build a robust system to transmit the rotation of the body to the iris in such a small area though.

 

Anyway, I would love to see some WIP photos if you don't mind sharing your process?

Thank you.

 

The pilot style trapdoor is quite challenging.

 

Opening and closing of the iris using the twist motion would require more complex engineering. Given the fact that I am doing everything on a manual 7x mini lathe, such components may be out of reach. But I will think about it.

[manojd]

Hats off for trying to do something that few attempt or succeed at.

Thank you for the encouragement.

[SoulSamurai]

Thank you.

 

The pilot style trapdoor is quite challenging.

 

Opening and closing of the iris using the twist motion would require more complex engineering. Given the fact that I am doing everything on a manual 7x mini lathe, such components may be out of reach. But I will think about it.

 

Yeah, I figured, I just got excited because of how cool your work is!

[manojd]

Over the weekend I worked on another nib holder for this pen using Kanwrite flex nib. These nibs have superb ink flow and the drying issue is virtually not there. The pen starts writing in just a few seconds.

 

[Newton Pens]

That's awesome. Somebody emailed me a few years ago asking if I could make them a pen with an iris thing like this. Very very cool.

[fountainbel]

Impressive work , bravo !

Francis

[manojd]

That's awesome. Somebody emailed me a few years ago asking if I could make them a pen with an iris thing like this. Very very cool.

Thank you Shawn. Well now you can. The mechanism is remarkably simple. Still trying to figure out if I can do the automatic hatch.

[manojd]

Impressive work , bravo !

Francis

Thank you Francis.

[RUGMAN]

Proportionately, the nib is way too small for the pen.....But a good idea!@

[Doug C]

I want one when they are in production...!!

[amberleadavis]

I think it is looking awesome.