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Discussion & Design of Mechanics for Automatic Bladed Weapons & Exotic Gear
 
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 The Assassin Extension Knife

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SINZA
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PostSubject: The Assassin Extension Knife   October 15th 2008, 2:44 pm

First topic message reminder :

I'm going to start a new post for this new weapon design.
PLEASE KEEP THIS POST ON TOPIC. DISCUSS THIS DESIGN ONLY PLEASE.
We seem to have so many it just gets worse when they are mixed together.

..................................................................................................................

Recieved my 'Assassin's Extending Knife' in the mail today.
It was $135.00 + $10 to have it sharpened.

Description:
The Assassin Extension Knife locks into place with a simple slide.
A release button allows it to slide and retract.
Attaches easily to your Assassin vambrace.
Overall: 19-1/8"
Wt: 1 lb/4 oz
Blade: 9" long, 5/8" wide, 3/16" thick

Buy it here:
http://www.atlantacutlery.com/atlantacutlery/detail.aspx?ID=1946
or
http://www.windlassstudios.com/p-76-assassin-extension-knife.aspx

Here it is out the box...smells like oil.


Closed


Extended


The blade and sleeve.


Close up of the blade. Rounded tip to be a safe prop....it's a easy fix on the belt-sander.


The sleeve and front.


Here's the button lock. Very simple, this is all you really need guys!!



Opened up. Here's what you guys have been waiting for!!!! And it's simple!









How the flex cable is attached to the blade.


How the sleeve is attached to slide plate.


But how does it all work?!?!?! So simple....


It's so basic it's almost embarrassing.
If this is the first of this design I'd love to see really nice version made really strong.
It's great for what it was made for, a costume prop or addition to a collection.
That's why it has a rounded tip. It would be easy to make it a sharp point on the belt sander if you wanted.
I can't see it taking too much abuse before it broke or bent.
As it is it came without the lock spring, so I had to open it up to fix it with one of my springs.
Not a real big deal, but I wasn't happy about it until it was fixed.

It's a little big...but looking at it I really think it could be done without the top half of the 'box'.
If you re-positioned the lock this might be able to be made half thickness. That would make a big difference.

Can it be made automatic? Semi-automatic?

Maybe.
I could see a few different ways of redesigning this, maybe with springs....maybe with a lazy-tong...or both.
The cable and pully extension system is so simple, it's how our curtains used to work as a kid.

Is it worth the money?!?! That is up to you to decide. I know I'm happy I have one!!

O.k......did I cover it all??? Any questions??

Now....on to the redesigns and the project builds!!!!


Last edited by SINZA on November 26th 2009, 2:04 pm; edited 3 times in total
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PostSubject: Re: The Assassin Extension Knife   November 18th 2008, 9:28 pm

Quote :
Whoa... Incomplete post...? What happened there... You OK Sandman???

If this was a sci-fi movie, I'd say he got eaten, but since this is reality, I'm guessing it was a computer glitch. (Although considering the Balrogs and vampires we've got running around here, maybe this is a sci fi movie)

Anyway, have you thought of extending the glove to cover your elbow? If you used something like an elbow brace along with your current setup it might work.
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PostSubject: Re: The Assassin Extension Knife   November 19th 2008, 5:18 am

I was thinking about it, and looking at the pic, you can see that the leather is actually bunching up a little in some places. This may be where the give is coming from. Perhaps using thicker, stiffer leather may solve the problem... What a Face

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PostSubject: Re: The Assassin Extension Knife   November 19th 2008, 5:22 am

hey was wrde das teil mir kosten wenn ich es ber sinza bestell. sinza bekommt 200 flogen und ich das teil. whr das ein deall?


Google Translation:

hey what the part would cost me if I ordered it on SINZA. SINZA 200 fly and I get the part. currencies which a deal?
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PostSubject: Re: The Assassin Extension Knife   December 18th 2008, 5:10 pm

sinza have the hiddenblade but germany have the rest of the weapons:

http://www.schwertshop.de/schwerter/assassins-creed/index.html
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PostSubject: Re: The Assassin Extension Knife   December 18th 2008, 11:52 pm

I ordered one o' these but Im waitin for it to arrive..I hope it gets here before I have to move....
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PostSubject: Re: The Assassin Extension Knife   December 20th 2008, 6:22 pm

OMG BG. That website made my day, for sure.
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PostSubject: My Designn   January 4th 2009, 3:51 pm

Hey all, I'm new to the Forum, but I've been here before looking at the topics to do with the Hidden Blade. Just saying hi to all, and as soon as I get it onto this computer, I'll post my design for the hidden blade.
It uses the lazy tong idea, but I haven't had time to test it because I am out of metal.
so as soon as I get more, ill make the tongs and get to work.
I've done some math and measurements, which were all on a couple of sheets of paper, but they were mostly just multiplications and things that went along with my train of thought.
As I said, when i get the plans on this machine, I'll post them.
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PostSubject: Re: The Assassin Extension Knife   January 6th 2009, 3:48 am

Well welcome aboard S666, we'll be looking forward to seeing what you come up with... Expecially once you get that test design put together... :)

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PostSubject: Sinza, I was wondering...   January 9th 2009, 8:06 pm

I seen you bought an replica of Altairs hidden blade. Have you converted it over to fully automatic yet? And also, I was wondering how the wristblade retracts. I was thinking about buying one for myself, but there no longer making the sharp version. And for some reason Im worried about buying this piece and the quality not being what I expected.
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PostSubject: Re: The Assassin Extension Knife   January 10th 2009, 2:41 am

I haven't done anything to it other than mount it to a leather bracer.

Not sure if I could make this fully automatic...it's a weird system.
But you don't really need to. A good snap of the wrist and it's open. Push the lock button and snap your wrist back and it's closed.
It's the perfect flick knife...it just needs to be built as a real weapon and not as a replica.

The blade extends and retracts manually. You pull the knob forward and back and the blade moves forward and back.
The whole internal mechanism is just to reduce the knob pull length...it about doubles it.
Their is no 'extension sleeve' it's a sleeve cover, but works well as a handle if you want to grab it.

Quality.....

It is meant to be a reproduction replica of a fictional weapon. It is not meant to be a real weapon.
The blade is steel and mine is sharp, but the internal mech isn't designed to handle stabbing pressure....the blade just gets pushed back straining the mech. Also, any side slashing strikes would end up bending or breaking the device and/or blade.

IT IS COOL....Don't get me wrong....it is a cool toy. Fun to strap on to your wrist and snap out. Snapping out a blade is a BAD ASS feeling. It's the same king of rush you get when you fire a gun...different, but the same kind of cool factor.
If you want one I would suggest getting one and not worry about if it's sharp or not, you won't be cutting anything with it. And it's not pointed...

Is it worth the money? All depends on how much you want one....but I'd say yes.
It's what...$150...If it was made with the quality of a really good knife it would be at least $500...so again I'd say yes.
Me? I'm thinking of getting another. One to keep and one to tinker.

If I am going to do anything with this it will probably be just using the design and building my own from scratch with a better blade, stronger locks, less bulky/thinner case, and a stronger support system. But again...it is cool. I'd suggest getting one while you can.
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PostSubject: Re: The Assassin Extension Knife   January 20th 2009, 7:07 pm

I actually stumbled on this thing while looking for a blade. I noticed some flaws right off the bat, the most obvious being that you have to manually retract is. Can you even imagine Altair running though Darmascus, trying to get his blade back in? Other than that, they don't ship them sharpened anymore, and it has a sleeve it retracts from. The real blade has 2, but I wouldn't use one at all. It's like nailing oe plank onto another at the edge without any support from underneath, the dam think will fall apart after 50 uses, let alone trying to pierce someone ribcage.
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PostSubject: Re: The Assassin Extension Knife   January 21st 2009, 11:01 am

Quote :
Can you even imagine Altair running though Darmascus, trying to get his blade back in?

Yes!

(But I have been told that I have quite an imagination)

:joker:
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PostSubject: Re: The Assassin Extension Knife   January 24th 2009, 6:30 pm

hey, im new here but i'd like to know where you got that hidden blade? here? or if its not where you got it, is this pretty much the same thing?
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PostSubject: Re: The Assassin Extension Knife   January 24th 2009, 10:37 pm

Hey pharow and welcome, im not the person who purchased the wristblade but i do know that yes they are the same wristblades, you can also buy it on musem replicas for the similar price.
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PostSubject: Re: The Assassin Extension Knife   February 4th 2009, 9:31 pm

I have an idea..

It seems to me that the blade snaps out and back pretty easily, correct Sinza?

So instead of making it auto extend and auto retract with springs and such, why not just make a 'ring cable' attached to the lock release on the side. Then you could just pull your wrist back and snap the blade in.

Yeah, it wouldnt be as cool as an automatic, but it would be effective none the less.

Does this post have any validation? lol
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PostSubject: Re: The Assassin Extension Knife   February 4th 2009, 11:20 pm

that would also clear up the no spring assisted knifes law. so it has several benefits, also make the blade held in place well enough so gravity wont slide it out. that would be a good design for modern laws...for now...
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PostSubject: Re: The Assassin Extension Knife   February 5th 2009, 11:06 am

@ Sandman .....Yes, that would work. As it is it works fine as a gravity blade. If it had a better lock it would be good to go.

@Beefy....We've talked about this a few times over the last year. Spring or gravity the law will still see this as a weapon, not a pocket knife. They will call it a A.O.W. -Any Other Weapon...cops know a weapon when they see one.

Just face it and look at it like this.....

Wearing a wristblade is the same as smoking pot.
It's illegal. You know it, I know it, the cops know it.
Now, you can smoke weed every day and might never have a problem.
Carry it with you, be careful where you pull it out and who sees it.
I carried a very large dagger through most of my 20's. Was never searched by police for any reason during that time.
But I knew I was breaking the law and I knew I was taking a risk. Was it worth the risk?!?! Always...if you don't get caught.
But getting busted for having a big dagger/wierd weapon is kinda dumb when you can legally carry a gun or folding knife.

So....in my opinion.....stop trying to get around the law.....stop worrying about it. Accept the fact that if you are walking around outside your house with a wristblade strapped on you are a criminal and breaking the law.

Also, it's like packing a gun. There is really no reason to have it unless you are willing to use it.
If you are unwilling or unable then it's best left at home in the toybox.
And with most/all of these being homemade prototypes it's just best to leave them at home.

Bottom line:
Break whatever laws you feel you can live with and get away with. Some people shoplift, some people smoke weed, some people rob banks. ...and some people wear wristblades. Accept the fact that it is illegal and make a adult choice on what you want to do, but don't cry if you end up shot or in jail. I speed on my motorcycle. I do this often. I just got another speeding ticket. Am I angry? No. It's my choice to speed and I pay my bills when I get caught, don't even try to fight it. It's the price for speed. Can you afford the price for your vice?
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PostSubject: Re: The Assassin Extension Knife   February 5th 2009, 2:34 pm

Agreed. As awesome as it would be, being able to legally carry a wrist blade or such would not only demean its coolness, but i just dont see it ever happening.

You'd be searched everywhere you went
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PostSubject: Thanks   February 14th 2009, 4:05 pm

I was looking a long time for this, many people on youtube were playng with lego creating these this blade. It hasn't made me happy for 100%, but for 99% it has. I still, need some modifications with pulling back system, because i don't want that people notice that i'm pulling the blade back (sorry for bad english). Oh and Sinza how did you find this blade, how did you interested in it. Have you played the assassin's creed or what? :)
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PostSubject: Re: The Assassin Extension Knife   February 14th 2009, 6:54 pm

hello DV, welcome! is english not your fist language? if its german (just an educated guess) we already have some members who speak it. dont worry about your english, its a little out of order but its still good Very Happy
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PostSubject: Re: The Assassin Extension Knife   February 15th 2009, 12:15 pm

Hey DV, welcome to the forums!

Have you designed/built anything yet? or are you just looking for ideas?

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PostSubject: DV   February 15th 2009, 3:09 pm

Thanks for welcoming, you're all very frendly and i'm from lithuania. Very Happy . Oh and i just got some mechanisms in my mind. I was thinking about the retro phone gear mechanism it's not so big so it could fit to the blade and make it fold back. But for the rsult it would be hard to pull the blade out. If some are intrested try it. Hope it would help, for now i'm making the same blade as the sinza has posted. Its perfect, maybe 1,5 cm shorter but better than nothing. Very Happy
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PostSubject: Re: The Assassin Extension Knife   February 16th 2009, 2:44 am

Labas ! welcome fellow Lithuanian.

Lithuanians have a national emblem, Vytis on his horse waving a sword.

We're going to have to try and convince the government to switch to
a xiphoid.
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PostSubject: Re: The Assassin Extension Knife   February 16th 2009, 4:27 am

Ahh... dunno Jer... I think the Xiphoid emblem has already been taken by the Democratic Republic of Sinza... ROFL ROFL
Very Happy
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PostSubject: Re: The Assassin Extension Knife   February 16th 2009, 8:49 pm

THIS IS SINZAS REPUBLIC!!!
*kicks off ledge*
*watches fall to the ground three feet below*
*note to self: get higher, more epic ledge*

I'm sorry I've been gone for so long, I've also put the Hidden Arm Blade on the backburner for now. I realized that due to my rather low experience with Xiphoids and the like, that i would do some research and maybe some more plans/tests, but other than that, I've moved onto some other projects.

I recall promising my design to you guys, if someone can understand and build it, then more power to you.

the idea goes as follows

you have a case that is approximately 1 5/8" this means that you have to be able to make lazy tong peices that are less than that size. I think my idea was 4 cm or something, Metric works better for me. Now, it is 10 1/4 long, with a 17-19 cm blade.

say 7 1/2 inch blade
so that gives you about 2 3/4 inches to make the lazy tongs so lazy tongs of 1 cm width and 4 cm length will let you have nearly 7 cm with which to work. then you put the tongs together, with the blade, add springs on both sides, with locks, and your done. I've repasted Sinzas measurements.

also, I'm sorry for making this so obscure, when i get the chance, next couple of days/a week, I'll make some plans on paper and scan them. I hope this proves that the chainmail and automail didn't take up all my time Wink

The box is 10 1/4" x 1 5/8" x 3/4"
sleeve extension is 4 1/2" x 3/4" x 1/4"
exposed blade is 4 1/2" x 5/8" x 3/16".
Overall open: 19-1/8"
Wt: 1 lb/4 oz

-Schrodinger
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PostSubject: Re: The Assassin Extension Knife   February 17th 2009, 3:05 am

Well, lets see the plans, and then we'll talk... Very Happy Very Happy
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PostSubject: Re   February 19th 2009, 2:56 pm

I think few drawings and sketchs could help as all. The blade length should be 16 cm when you make a fist (see the drawing to understand my language Very Happy)
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PostSubject: Re   February 19th 2009, 2:57 pm

I'm interested in mechanisms and i will try to post the full blade mechanism or drawings of my work as soon as posible.
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PostSubject: Re: The Assassin Extension Knife   March 16th 2009, 12:43 am

Two or three ideas for consideration:
One: could the blade just have one light return spring, just so it yo yo's in and out?
Two: Glove and gauntlet are part of the mechanism? I did a post previously on the glove being part of the locking mechanism.
Three: Muscle engaged lock. The Idea is, take to fingers and place them on the inside of your forearm near your elbow, press in so that your fingers make a small dent, now flex your forearm. Your fingers move a small distance, this could be enough to engage a lock. Also it is possible to move your wrist and arm while keeping your forearm flexed. Also a flex like that is not a natural action that occurs in many other activities so it would be possible to run, jump, and fight with out triggering it.
Questions, comments, yes, no, ideas, would all be great.
Thanks.
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PostSubject: Re: The Assassin Extension Knife   March 16th 2009, 1:07 pm

Mars42 wrote:
Two or three ideas for consideration:
One: could the blade just have one light return spring, just so it yo yo's in and out?
Two: Glove and gauntlet are part of the mechanism? I did a post previously on the glove being part of the locking mechanism.
Three: Muscle engaged lock. The Idea is, take to fingers and place them on the inside of your forearm near your elbow, press in so that your fingers make a small dent, now flex your forearm. Your fingers move a small distance, this could be enough to engage a lock. Also it is possible to move your wrist and arm while keeping your forearm flexed. Also a flex like that is not a natural action that occurs in many other activities so it would be possible to run, jump, and fight with out triggering it.
Questions, comments, yes, no, ideas, would all be great.
Thanks.
First' maybe it could but i think you would need to shake your hand harder because that spring may not let the blade fold out easily.
The second thing that the gauntlet helps to keep still the blade on your arm and the glove just helps your hand for little wounds (i mean when you are parkouring in AC)
The third thing is men i really need some lessons of english Very Happy, but how i understood you're talking about mechanism activation by fingers. 1 ring should activate the folding out blade and the 2 ring pulled by your little finger should make the blade fold back.

Sorry for big image and my bad english Very Happy it won't happen again. I hope Very Happy
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PostSubject: Re: The Assassin Extension Knife   March 16th 2009, 5:08 pm

No not activated by fingers but by a muscle flex. Also I know that the gauntlet is for stability and the glove for protection, but is it possible that they could also be pulling double duty as a trigger/locking mechanism?
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PostSubject: Re: The Assassin Extension Knife   March 28th 2009, 11:50 am

[/quote]
First' maybe it could but i think you would need to shake your hand harder because that spring may not let the blade fold out easily.
The second thing that the gauntlet helps to keep still the blade on your arm and the glove just helps your hand for little wounds (i mean when you are parkouring in AC)
The third thing is men i really need some lessons of English Very Happy, but how i understood you're talking about mechanism activation by fingers. 1 ring should activate the folding out blade and the 2 ring pulled by your little finger should make the blade fold back.[/quote]

nice idea, but its muscle flex
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PostSubject: Re: The Assassin Extension Knife   April 10th 2009, 1:52 pm

This sucks I can't buy the blade because they won't ship it to California. Pisses me off.
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PostSubject: Re: The Assassin Extension Knife   April 12th 2009, 9:30 am

cosmicsmasher wrote:
This sucks I can't buy the blade because they won't ship it to California. Pisses me off.

And this is why I could never live in California. Not until I get a FFL. And they come up with a Specialty knife permit for AOWs and such... :)
Don't see that happening any time soon though... :/
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PostSubject: Re: The Assassin Extension Knife   April 23rd 2009, 7:56 pm

I think that the lazy tongs would work good.
But heres my suggestion
How about the lazy tongs are an automatic extention when a release button is pressed and a manual pull back to reset the blade
i dunno
just a suggestion
I'm working on some schematics for my desgin
I'll post them once there finished
if you good reply with thumb up for a good idea and thumb down for a bad idea
and post comments about my idea or suggestions to make it better

Bill Sykes
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PostSubject: Re: The Assassin Extension Knife   April 25th 2009, 8:00 pm

Yes, that would work, we already have designs for both of those on the site..
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PostSubject: Re: The Assassin Extension Knife   April 29th 2009, 12:36 am

hi, i was just wondering, if someone actually makes a good, quality, sharp, automatic hidden blade, that won't break easily, i will buy it from you, for a reasonable price Razz bacon
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PostSubject: Re: The Assassin Extension Knife   May 1st 2009, 5:14 pm

when mine is finished it should be a flick of the wrist to get the blade to lock in open position and then a pull of a cord to activate the elastic which will pull the blad back in and lock it.
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PostSubject: Re: The Assassin Extension Knife   May 4th 2009, 7:27 am

Lonely Soul wrote:
when mine is finished it should be a flick of the wrist to get the blade to lock in open position and then a pull of a cord to activate the elastic which will pull the blad back in and lock it.
I was thinking over my design, and i believe this is EXACTLY how the blade is intended to act in the game, if this is successful, you will most likely have what the game creators were going for. I would try a bokermatic s/a rectracting design for this, it may do what it is you are going for.
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PostSubject: Re: The Assassin Extension Knife   May 5th 2009, 5:27 pm

dude... i searched about 2 months for a site like this oO

hay guys i'm new xD

thats me:

i'm Max G., a steel worker from a little village near berlin
and i love dat assassins creed wrist blade Wink

ummm....... i have to build it this week *_*
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PostSubject: Re: The Assassin Extension Knife   May 5th 2009, 5:41 pm

eeeem....

,,make the slider with pulleys. Would be nice to be able to build this without welding.'' by Sinza


wthout welding? sorry but then it woeld be stronger and not get broken after one use xD


*sorry for bad english, i'm stupid german*
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PostSubject: Re: The Assassin Extension Knife   May 16th 2009, 9:18 pm

Hi, I'm new here. A friend of mine has been into metalworking for years and I think he may
be able to fix the whole durability issue.

Problem is that I live in NY and they won't ship me the blade. Would it maybe be possible for
me to work out a deal with someone who lives in an area where it is legal to order, to order it for me in exchange of the however many dollars it costs?
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PostSubject: Re: The Assassin Extension Knife   May 19th 2009, 11:22 pm

mine came in the mail finally..I have it and I've built a gauntlet for it as well...its awesome
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PostSubject: Re: The Assassin Extension Knife   May 24th 2009, 6:08 pm

hey found a site where you can get the cheaper, just under $100
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PostSubject: Re: The Assassin Extension Knife   May 24th 2009, 6:11 pm

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PostSubject: Re: The Assassin Extension Knife   May 29th 2009, 3:14 am

Hey Micia, Thanks for the link! thumb up
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PostSubject: Re: The Assassin Extension Knife   June 7th 2009, 11:41 am

Hello! I'm new to the forum, but I wanted to see the mechanics behind the hidden blade for a long time. I played the game so I can tell you the specifications: Altair releases the blade using a a ring on his pinky finger and the blade automaticaly retracts after a period of time. But the blade is locked in place between the release and retraction so he can use it to stab. There is a possibility that when the blade retract the ring is detensioned so the blade would be actioned only by the ring, but this means the ring somehow keeps the lock on (not the blade itself) while the blade is out, because it whould be impossible for the pinky finger to counteract the force applied on the blade while stabbing. I hope I've been useful and I made myself understood. English isn't my native tongue!

I'm looking forward to see the schematics of a mechanism that makes Altair's blade to do what it was supposed to!
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PostSubject: Re: The Assassin Extension Knife   June 7th 2009, 12:00 pm

Hey yo Captain jack Very Happy welcome to the forum.
First ya I also tought that blade retracts automaticly, perhaps using watch mechanism but that's aint true because when you hold the mouse button blade stays out for long, everything else i didn't understood quite good but I think that you need to hold the activation ring when stabing to keep blade still. Well I think it's imposible cause the ring wire had to be very long and then there would be problem with the activation
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PostSubject: Re: The Assassin Extension Knife   June 7th 2009, 10:34 pm

You know, i've kinda thought about this. And DA OTF has the best approach. But if you are trying to do a scissor extentd. You'd need to do something to tie the two into each other. I don't know if any one has come up with this idea.

I'll see If I can get a sketch up ina few
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PostSubject: Re: The Assassin Extension Knife   June 12th 2009, 5:45 am

if you want to keep this design simple, why not make a small metal case with tabs on the front to stop the blade from coming out too far, then a blade with two flat tabs as close to the bottom of the blade as possible. put strings through that that attach to rings worn over middle and ring fingers. then have a spring on the bottom of the blade attached to the bottom of the case
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PostSubject: Re: The Assassin Extension Knife   June 12th 2009, 5:51 am

by the way, i would love to see your scematics lonely soul. your design sounds very interesting.
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PostSubject: Re: The Assassin Extension Knife   June 14th 2009, 5:38 am

dude nice link, are those real knives or props?and is the hidden blade acctuly a hidden blade or is it just a gauntlet?

i should realy get around to learning german...


thanks again Very Happy
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PostSubject: Re: The Assassin Extension Knife   June 14th 2009, 5:41 am

uhh sorry should have red the second page, i ment the link before this. but this is preaty cool too =D
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PostSubject: Re: The Assassin Extension Knife   July 15th 2009, 7:42 pm

i think its hilarious that assassins creed has been out for mabye, 2 years and people have already made several mass produced replicas of his [altiar] stuff. ubisoft knows how much profit they would make by producing REAL replicas instead of this other mimic products. WAIT! i am not shitting on all of the exsisting products, i am just saying that it would be cool to have a high quality knife replica. but ubisoft would probably face major insurance, or other issues. just saying.
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PostSubject: Re: The Assassin Extension Knife   July 16th 2009, 2:21 am

@Deck
Welcome to the forums.
Yes, it would be cool. But it would also open them up to all kinds of liability. U suppose, however, that they could gimp it somehow, kind of like the guys that made the SAW blade replica did. Run a bolt through the whole thing.
I dunno...

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