Redesigned piston fill actuating system

[fountainbel]

Hi all,

 

Attached a link to a picture showing a new demonstrator and a black HR piston filler, featuring a new design "differential" piston actuating system.

 

Although my previous system is technically (nearly) perfect, making the 4.00 mm diameter( 4 leads) drive spindle and the mating Peek nut was rather delicate and time consuming.

 

Further on I could not reach my goal of 2.0 ml ink intake with this system

 

The new system is in principle similar to the Pelikan system, although - aiming for a generous 2.2ml ink intake- completely different in design and lay-out.

 

The dimensions of the capped pen are identical the my previous design, the posted length is 4 mm longer.

 

The demonstrator is filled with water,one can see the remaining small air bulb close to the section.

 

The black HR is filled with ink.

 

Note also the new prototype clip I've made on the demonstrator.

 

Next time I will make the clip wider , equally to the clip on the HR version, this is only a first test of principle

 

This ( rather complex) clip design aims allowing me to make both parts of the clip alternatively in titanium in the future

 

The separate barrel thread ring –screwing in the cap- will also made in titanium in this case

.Technical specifications of my "finalized" (?) piston filler :

 

Dimensions :

 

Capped length : 140mm

 

Posted length : 168mm

 

Uncapped length : 137mm

 

Cap diameter : 15mm

 

Weight (completely filled)

 

Capped : 28 grams

 

Uncapped : 20 grams

 

Effective ink intake : 2.2 ml

 

As always you comments , thoughts & suggestions are most welcome.

 

Thanks for reading so far!

 

 

Francis

 

http://i62.photobuck...wPiston1003.jpg

 

Edited to add Technical spec's, thanks penspouse !

Edited March 29, 2010 by fountainbel

[penspouse]

I like it!

The dimensions of the capped pen are identical the my previous design, the posted length is 6 mm longer.

Forgive my ignorance, what are the dimensions of your previous pen? I missed that one.

Edited March 29, 2010 by penspouse

[richardandtracy]

The image is:

http://i62.photobucket.com/albums/h89/fountainbel/NewPiston1003.jpg

 

Very nice.

 

Regards,

 

Richard.

 

 

[penspouse]

If I were writing with it, it would have to be unposted. My hands are small. Still a nice looking pen. Love the piston fill.

[mic]

your pen making skills are truly unmatched. as a fledgling pen maker seeing what you can do shows me that the sky is the limit and MY skill is a limit. the only thing i would change about your pens is i would make them my pens and maybe shorten the clip a little but over all these are as close to perfect as i have seen. i am a fan.

 

matt

[hari317]

Nice Francis!

[jellybelly1]

As usual with all of you work, FANTSASTIC Francis I am now officially drooling ...

 

-- Abi

[fountainbel]

Hi all,

Thanks all for your comments .

Attached some Photobucket links showing a slightly upgraded clip design, featuring a ring with the same thickness over its full circumference

As for the clip, for evaluation I've made the ring from hard aluminum while the clip finger is stainless steel;

As stated before, my aim is making all the metal furniture (complete clip, swaged cap ring and section thread clutch) from titanium.

Doing so the match with the titanium nib would be perfect.

Since titanium sheet can not be bend -surely not a at 90°- I had to come up with with this ( rather complex) solution

The clip mounting ring is 4 mm thick all arround, and the clip pinching finger (1.5mm thick 5.5mm wide) is press fitted in the mounting ring.

What do you all think?

Thanks, Francis

 

http://i62.photobuck...el/3clip006.jpg

http://i62.photobuck...el/3clip005.jpg

http://i62.photobuck...el/3clip007.jpg

 

PS: Sorry Richard, I did not suceed in posting the pictures directly.

Edited March 31, 2010 by fountainbel

[Michael R.]

Dear Francis,

 

Many thanks for sharing your updates on your pen projects.

 

Here are the images:

 

http://i62.photobucket.com/albums/h89/fountainbel/3clip006.jpg

 

http://i62.photobucket.com/albums/h89/fountainbel/3clip005.jpg

 

http://i62.photobucket.com/albums/h89/fountainbel/3clip007.jpg

 

I like the overall shape of the pen a lot but prefer the more simple design of the black pen (no cap ring, simple clip).

 

Have you thought about using a screw to hold the clip in place (similar to the rivited clips of old Waterman pens)? At least I would prefer an internal clip mounting ring over the externally visable one.

 

Your attempts to have all (visable) metal parts made from the same material should make it a great looking pen!

 

By the way, the logo on the cap top is great.

 

 

Cheers

 

Michael

[Juicyjones]

I am so fascinated by the piston system. Did you achieve the 2.2ml mark with this try?

 

Love that cap-top logo. I agree with Michael R, I'm not a fan of the clip. I do like a cap band though, generally.

[Breck]

I am a fan of this pen from top to bottom. Any plans to produce some for sale?

[stevlight]

Love it--prefer the simple clip on the black pen--clean simple lines--beautiful--love the logo.

 

 

I am a fan of this pen from top to bottom. Any plans to produce some for sale?

 

+1

[fountainbel]

Thanks for the comments !

Input & feedback is very valuable for me, since it always triggers new ideas and approches .

Michael,

I also had some doubts on the new prototype clip.

The clip shown on the black flat top surely will remain the standard version

However-as stated in my earlier post - my aim is to use Titanium for all metal parts for an alternative clip design.

Unfortunately one can't bend titanium at 90°, it will break doing so.

This is the only reason why this prototype was made as such.

I'll surely look for an more appealing design.

Juicyjones :

Yes, using the new piston design the pen effectively fills 2.2ml.

Installing a swaged capband for aesthetical purposes is surely possible.

Breck & stevlight:

I have still not decided if I will start making these pens for sale.

Being a (retired) mechanical design engineer, my main pleasure is in designing, making prototypes & optimising the design.

The pen is technically rather complex -hence time consuming - to make on my manual lathe & milling machines.

However CONID most probably will start making the pens on CNC machines in the near future.

Thanks for your interest !

Francis

[Michael R.]

[...]

Have you thought about using a screw to hold the clip in place (similar to the rivited clips of old Waterman pens)? At least I would prefer an internal clip mounting ring over the externally visable one.

[...]

 

Cheers

 

Michael

 

 

[...]

Unfortunately one can't bend titanium at 90°, it will break doing so.

This is the only reason why this prototype was made as such.

I'll surely look for an more appealing design.

[...]

 

Francis

 

Could you make an almost flat and simple clip which is fitted with one or two metal (titanium???) screws into the cap (a small metal suport in the cap like a small platform might support the whole construction with a small thread which will house the screw) following the design of vintage Waterman's rivited clips or the design of one of the early Delta pens (which used Titanium as well)?

 

Using a real, visable screw would show a true modern, industrial design but maybe would not look to bad ?!

 

http://www.yafa.com/images/delta/extrema_90201.jpg

http://www.yafa.com/images/delta/extrema_90201.jpg

 

http://www.vintagepens.com/images/cat/7027d.jpg

http://www.vintagepens.com/images/cat/7027d.jpg

 

Also a specially shaped/engraved screw or rivet could be painted black and white just like the Conid logo (...I know production costs )

 

Cheers

 

Michael

 

PS: Unfortunately my graphic skills are far away from yours; otherwise I'd attach a little sketch :embarrassed_smile:

Edited April 12, 2010 by Michael R.

[fountainbel]

Thanks for your excellent input Michael, much appreciated.

I'm somewhat reluctant using a screw for mounting the clip.

A screw implies a screw driver slot and looks somewhat "cheap" to me.

But mabey you're right on the other alternative you proposed, being a rivet fixation.

Question is in how far one can get a proper fixation in hard rubber or celluloid.

In the meantime I've made a new clip design, shown on the "stubby" Delrin pen on which I've just posted a new post.

The clip fixation & functionality of this clip is really perfect , and looks really nice - at least in my opinion.

What do you think?

There is however a lot of work involved in making this clip set-up, so it don't think I will persue with this design.

So back to the drawing board!

Thanks again

Francis

[rroossinck]

Really love that chunky capband on the demonstrator. The clip looks pretty cool too; definitely carries a beefy, industrial look to it.

 

I'm not normally a demonstrator guy, but that one is pretty darn cool! Love the logo too, Francis!

[Pippin60]

I also like the industrial look of the clip in the demonstrator and as others have said maybe a bit shorter though; and think it would look great on the black ebonite pen or perhaps all metal with turning on the outside.

Edited April 14, 2010 by Pippin60