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Valued Contributor
robm1983
Posts: 53
Registered: ‎05-03-2008
Message 1 of 10 (2,825 Views)

Designing a revolving derringer hammer ( pics )

2825 Views, 9 Replies
09-03-2012 01:23 PM

Hi guys,

English isn't my native language, so bear with me. :smileyhappy:

I am trying to design a kind of a modern version of four barrel derringer. As you can see in the pictures below, the hammer has a rotating disc on it with a firing pin. When the hammer goes back, disk if supposed to interact with the back piece ( not sure what's the right English word for it ) and rotate 90 degrees, so that the firing pin would be positioned to strike the next round.

 

Yet somehow I don't feel right about the way I designed it. Even if it won't get stuck, it might make the trigger-pull rather hard and awkward...

 

What do you think about such design? Maybe you'd have better ideas about how to make the firing pin turn?

 

Thanks!

 

 

 

 

 

patent of an old derringer:

 

Valued Mentor
mpatchus
Posts: 451
Registered: ‎10-22-2008
Message 2 of 10 (2,778 Views)

Re: Designing a revolving derringer hammer ( pics )

09-04-2012 08:28 AM in reply to: robm1983

Not seeing the pictures. :smileymad:

Mike Patchus

Inventor 2012 SP3 ~ Vault Pro 2013
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JDMather
Posts: 26,305
Registered: ‎04-20-2006
Message 3 of 10 (2,776 Views)

Re: Designing a revolving derringer hammer ( pics )

09-04-2012 08:30 AM in reply to: mpatchus

mpatchus wrote:

Not seeing the pictures. :smileymad:


They show up here - but I have been having trouble off-and-on seeing pictures (even ones I attached) on the forum lately.

 

I would use Dynamic Simulation to analyze the mechanism - but that is an advanced topic that would probably be too difficult for that assembly to cover on a forum.

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mrattray
Posts: 2,471
Registered: ‎09-13-2011
Message 4 of 10 (2,750 Views)

Re: Designing a revolving derringer hammer ( pics )

09-04-2012 10:38 AM in reply to: robm1983

That thing will kill whoever shoots it. The partial chamber will not support the case head of the cartridge, and it will literally blow up in your face.

Mike (not Matt) Rattray

Valued Contributor
robm1983
Posts: 53
Registered: ‎05-03-2008
Message 5 of 10 (2,730 Views)

Re: Designing a revolving derringer hammer ( pics )

09-04-2012 11:57 AM in reply to: mrattray

Don't worry, it won't be shooting real ammo. :smileyhappy: This will be special 15x90mm cartridges with OC ( pepper spray ) and a .22 blank round in the back to propel it.

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mrattray
Posts: 2,471
Registered: ‎09-13-2011
Message 6 of 10 (2,716 Views)

Re: Designing a revolving derringer hammer ( pics )

09-04-2012 12:35 PM in reply to: robm1983

.22LR has a pressure of up to 25,000 (yes, that's twenty five thousand) PSI. That's for a standard loaded round, I'm not sure how that translates with a blank but, I would make sure to do a lot of safety research here before you end up seriously injuring yourself or someone else.

Having said that, it is a clever idea. :smileyhappy:

Mike (not Matt) Rattray

Valued Contributor
robm1983
Posts: 53
Registered: ‎05-03-2008
Message 7 of 10 (2,707 Views)

Re: Designing a revolving derringer hammer ( pics )

09-04-2012 12:48 PM in reply to: mrattray

No, no, the blank round is much weaker then that, basically its only a primer without any gunpowder.

 

 

By the way, there already is a similar product on the market, only 13x60 with a centerfire primer.

 

*Expert Elite*
mrattray
Posts: 2,471
Registered: ‎09-13-2011
Message 8 of 10 (2,704 Views)

Re: Designing a revolving derringer hammer ( pics )

09-04-2012 12:53 PM in reply to: robm1983

Well, it's your choice... I know there's no way I would pull that trigger.

 

By the way, there's only about 1/2 of a grain of pistol powder in a standard 22LR load...

Mike (not Matt) Rattray

Valued Contributor
robm1983
Posts: 53
Registered: ‎05-03-2008
Message 9 of 10 (2,681 Views)

Re: Designing a revolving derringer hammer ( pics )

09-04-2012 01:59 PM in reply to: mrattray

Oh, the top picture was missing a back cover that holds the rounds in place.

 

n1.png

New Member
bbernadel
Posts: 1
Registered: ‎06-21-2013
Message 10 of 10 (1,472 Views)

Re: Designing a revolving derringer hammer ( pics )

06-21-2013 07:38 PM in reply to: robm1983

Is there any way I could get you to share the cad file with me?

bbernadel@hotmail.com

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