The Assassin Extension Knife

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!!!!

Oh damn, this is so easy and I've been ripping my hair out trying to get a good design.
TO THE ERECTOR SET
AWAAAAAAAAY

S3kShUn8 wrote:

i dont understand how it retracts...

I dont too. I made this last year
and I really dont know how this could retract. my theory back then, was
when you pull the string, it pushes the spring and the blade away, but then when you stop pulling the string, the spring would then pull the blade back.
then after 5 days, I thought that this was impossible. so
I was just sharing my ideas.

I gave up my spring system now, coz it really takes up a lot of space. I dont know where to buy that in france; this one:
XXXXXXXXX=====>
the XXXXXX thing which becomes kkkkkk when retracted.

I dont know the term too in english.



Edit: I really dont know where to focus on, the AC1 blade which uses the xxxxx something, or the AC2 blade which uses a pulley.

for future reference the xxxxx thing is called scissor jacks

this one

@qwertyui0
I'm late to the party, as usual, but I thought I'd say that looks very nicely done. Excellent work!

Hello everyone!
What does you think about this idea?

1. pull the ring-string 3cm out
2.the blue disk turns one complet turn
3. and pulls at the second cable
4. that cable moves then the black extention
5. the black extention presses the red knife out
6. a spring of a clockwork turns the blue disk back on the first position and takes the cable and the extention with it

i know there is no lock to keep the knife out, but this is just a functional diagram.
The arm is there for see the size (compact 150mm / extended 450mm

and sorry, its a bad picture

please, tell me what you thinks.

oliver84 wrote:

Hello everyone!
What does you think about this idea?

1. pull the ring-string 3cm out
2.the blue disk turns one complet turn
3. and pulls at the second cable
4. that cable moves then the black extention
5. the black extention presses the red knife out
6. a spring of a clockwork turns the blue disk back on the first position and takes the cable and the extention with it

i know there is no lock to keep the knife out, but this is just a functional diagram.
The arm is there for see the size (compact 150mm / extended 450mm

and sorry, its a bad picture

please, tell me what you thinks.

Seems too...can't think of it...complex? No...

seems like it would work, on paper at least. wouldnt the amount of effort needed to pull the string tho be too great?

Hellow, i'm new since today

What you guys made are just hallucinating AWESOME

what buzzes me is the AC2 Da Vinci revised hidden wrist blade, it seems very possible and prone to retract, i guess its do-able

About the retracting my dad maight have found a way to make it retract using the design you got (AC1 syle), we gonna test it ourselves first

i remember from a 'Baki the grappler' manga, that there was a guy who had blades implanted under his skin and could retract them using a different finger movement combination than the one to make them extract, what i thought off, it since most of you have the ring to pop the blade out, is use a second ring to make the blade retract...

Sorry but I know more about guns, than blades

stupid troll

Doudomida wrote:

would there be any way to make the bit that extends the blade, be able to be connected to wire which connects to a ring you could have around your finger and depending on how far you would bend your hand back, the more the blade would come out? and then when you relaxed your hand the blade retracts back since the wire is being retracted due to your hand being bent back to its proper position

(sorry if this has already been discussed or if my wording seems a bit muddled)

That would work but during combat you would want full control of your hand so you would want it to be lockable out and in. I am working on some plans over Christmas (I haven't got anything else to do). I have some basic ones but I can only extend it automatically and lock it out. I will upload the plans when I get the chance.

SINZA wrote:

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....

i don't understand the mechanism..... can you make a video where you disassemble and build it?

sorry but im new to these mechanisms

Hello everybody
I'm new to this site. I found it during my search for information on the hidden blade used by Altaïr in "Assassins Creed"

I'm trying to build a blade myself, so this site is realy usefull

When it's done, I'll post the result :)

Welcome, glad you found us.
Let us know how we can help. Show lots of pictures when you can.
Enjoy
Sinza

i don't understand the hidden blade mechanism.
can you make a video or more detailed photos of each piece with the instuction please?

I heard ya the first time.

I don't know how more detailed the pictures could be. I've shown everything.
I'll have to dig it out, it's in a zip case in one of my weapons drawers.
Sometime this week I'll try and open it up and make a video of it opening and closing.
Look at the labled picture again.
The SLIDE is moved back and forth by a knob.
Inside the SLIDE sits a BLADE attached to a CABLE. The CABLE is fixed to the CASE wall.
Move the SLIDE forward and you also move the BLADE and CABLE.
As the CABLE is moved forward it pulls the BLADE forward in the SLIDE.

So...Move the knob forward it moves the slide which pulls the cable which moves the blade. Understand?

yes i understood that, but i don't understand how the button activates all this mechanism. sorry if i'm so insistent, but i'm really ignorant!

don't matter, i finally understand how it works
thank you

Hey every one!!! :)

As many other people posting in this thread, I am new, I'm very interested in crafting a wristblade like the ones in the AC saga, although in my current situation, I don't have the means to do so, I hope to change this soon.

I have a couple of suggestions for people looking to craft a wrist blade.

1. In designs (primative schematics) I have thought up, the problem which kept slapping me in the face was that the hand movement to release/retract is restricted to being very brief, I think this issue could be solved by using what I would refer to as "Movement maximization" or just "Acceleration", by this i mean... Revolving a cog, 3cm in circumference by pulling it round 3cm, which then revolves a cog, 10cm in circumference, which then pulls/pushes the blade 10cm.

2.Using R/C motors that coast backwards, so the blade can be sring sprung, and then retracted with the motor.

2.2 - I understand that the speed in which the blade is deployed/retracted is a factor for some people, but I've yet to find a better solution.

3. Two switches/catches - in addition to a string pulled by your hand moving backwards, you could have a string down the back of the hand guided by tubing that then pulls another switch/catch/cog. as in the AC games the blade is depolyed by the hand tensing/pulling back, and retracted by the hand moving inwards, which would suggest a similar system?


Apologies if I acidentally revisited old ideas, or missed flaws in these ideas.

Also, I have been VERY impressed by some of the content on this forum, I've been baffled. This is probably the most amazing website I've ever visited.

Thanks,
Smiles.

Hey all, just discovered the site and wanted to throw my two cents in.

I'm not really sure if any of the following could even be done, but I figured sharing it couldn't hurt. Like with most of the gravity-based designs, it seems as though the way to extend the blade is by a flick of the wrist. A moderately stiff spring could be attached to the base of the blade (or a stronger support for the blade) and to the base of the housing. The spring would be strong enough to keep the blade retracted, but would have enough give that the blade could "slide" out with a sufficiently strong flick of the wrist (I'm assuming that the blade would be attached to a slide of some sort). Upon extending, the base of the blade would pass a pair of locks on either side of the front of the housing, locking the blade in place. I figure with two locks, one on each side, more stability would be provided.

Retracting it would require using the pull-string concept that most of the concept art depicts. Since the spring is stretched, it'll naturally want to constrict and draw the blade in. The pull-string could be connected to the locking mechanism(s), and pulling the string would pull the locks back, allowing for the blade to retract. The spring would pull the blade back fairly quickly, without having to manually move it backwards. And if the spring isn't tight enough and allows the blade to move somewhat without flicking the wrist, a small magnet at both the base of the blade and the base of the housing could provide some extra security.

Anyways, that just an idea that I've been throwing around. I haven't got much experience at any of this, some any constructive criticism would be excellent. Apologies if something like this has already been posted, I don't want to go stealing ideas (even if I've never read them). Oh, and thanks to Sinza for creating a forum like this, it's really fantastic to see so many people with great ideas brainstorming. Gives me some hope for the future

Hey LT3, welcome to the forums. Yet another great simple assisted retraction gravity Xiphoid. It could most certainly work, though without any kind of retraction lock, it'll move around a bit when you move, and be noisy when retracted, but I like the basic idea.

Nice idea!

Thanks for the welcome! And excellent points about the rear locks and the noise. The noise could potentially be reduced by having some padding of some sort at the base of the housing. There's also the option of having the rail that the base of the blade is housed on be an action-assist rail. Which basically is a rail that, when pushed beyond a certain point (either opening or closing the rail), helps to fully open or close the rail. So in theory, this could slow the blade down upon retraction (but if the spring is too rigid, it might overpower this design anyways).

As for the rear locks, I'm not quite sure how to work that out. I figure the locks would be spring-assisted and would automatically pop into the cutouts at the base of the blade/base once it passes the point. And they could be retracted upon pulling a string attached to them, which would then free the spring up to pull the blade back in. I suppose a similar set of locks could be used at the base and attached to the same string. Luckily, the locks at the base would just need to hold the blade back. The lock design at the front would need to both lock the blade and provide sufficient support so that a stabbing motion wouldn't break them.

And I just realized that the locks in the illustration I made before need to be inverted, along with the cutout in the blade, for it to work the way I intended. Hmm...

But thanks for the suggestions! It's always good to have somebody else looking at your work, they tend to pick up everything you miss. Cheers!

Hey once again, I decided to make a very brief diagram of my idea suggested above.

Here it is, Crude and simple.

Quote :

1. In designs (primative schematics) I have thought up, the problem which kept slapping me in the face was that the hand movement to release/retract is restricted to being very brief, I think this issue could be solved by using what I would refer to as "Movement maximization" or just "Acceleration", by this i mean... Revolving a cog, 3cm in circumference by pulling it round 3cm, which then revolves a cog, 10cm in circumference, which then pulls/pushes the blade 10cm.

ttfn!

@LT3
Glad to help...

@Smiles
Yes, this would work. In fact this compound pulley design has been implemented on several of the xiphoid schematics already on the site.

Come on people, especially the new members, please at least READ THROUGH THE FORUMS before you post!!! At the very least, read through the AC blade threads, and the SAW blade threads, any threads related to what you want to build should be the *BARE MINIMUM* that you should be reading through, and looking at existing schematics, BEFORE posting.

There are too many of you trying to reinvent the wheel, or, in this case, pulleys, and you do both yourself and us a disservice by not doing even the minimum due diligence.

Sorry Phyre, I am trying to read through them all, but I only signed up yesterday, and I haven't had time yet.

No problem, Just make sure you read through all the relevant threads, and perhaps a few of the less relevant threads, :) before you start asking questions.

Hey guys, I'm new to the forum/site also and I'd like to say wow. All these ideas are amazing and completely beyond what I could dream of thinking/doing/making.
I am starting to try to make my own hidden blade. I have a stopping mechanism for when the blade it comes out but it doesn't hold for much pressure. My paint skills suck so I probably can't make a plan and I have yet to find a good ball bearing slide for it (I'm looking for a good 8.5-9" slide for my concept as the one I am using right now is 12"+ which is way too big).
I'm not too good at mechanics but my idea should work and it's pretty solid. Also if anyone could find were to buy a cheap gauntlet (doesn't have to be related in any way) I'd be very grateful
Anyway I enjoy the forum and I have really enjoyed readong over your posts and ideas and i'm hoping some of them will spark an idea into my head haha.

~~Axel~~

uh.... can a mechanism the when you pull the string a little tiny gear like thing turns and locks onto a little point then when you pull the string again it reverses and lock.. ill try to find or make a piicture of what im talking about i dont know it might be to complicaed or something just ya know hope its a good idea :/

@Axel
Once you can find a decent slide, things should be a lot easier. And if you're looking for help on a decent locking mechanism, check out Nightshade's xiphoid. His design could easily be modified to include a slide, and his locks are among the simplest, easiest to understand, and seemingly most effective that I've seen on the site.

Unfortunately, most of the gauntlets/vambraces that you'll find on the internet are pretty overpriced. Your best bet is to make your own. Once you find a place that will sell you decent leather, all you need to do is use google and skim through some of the results until you find decent instructions. There are far more results for making gauntlets or other leather armor than there are for making xiphoids and other cool weaponry. Plus, you can show off your own handiwork. Everything is cooler when you make it yourself! Hope I helped a bit.

Excuse my mechanical ignorance here, but would it be possible to adapt a double action OTF spring system to the pull ring used like in Assassin's Creed or would it only be useful as either extension or retraction?

Apologies for the extra stress. And to make you feel better, I did try looking. I just seem to go blind when the answer is right in front of me. *shame*

Dont take it all on you, you just happen to be the straw that broke the mules back.

This has been happening for a long time, I probably did it once when i first started. Granted there was far less information, but i didn't have all of the tools you have now.

When I first started I read every sticky post, and at least skimmed over all of the others. I may have missed a couple things, but at least i saw all of the diagrams and schematics. If I saw a diagram i didn't understand, I read the posts following so that i could understand it.

This way it prevented myself from asking the completely obvious questions. I may have asked a question that had already been answered, but it wasn't one that was right in front of my face but deep within the forum.

So in short, do your research

If in doubt, just do what I did: browse pretty much every thread that looks as though it has something to do with what you're thinking about. Just because somebody might be looking to do an AC hidden blade, doesn't mean that they can't find great ideas and information from things like the Predator or Saw threads. So just read. It's like building one of these things, you can't just expect instant gratification. It takes work.

https://www.youtube.com/watch?v=bMlnBXCBqXA