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!!!!

Here is my idea for a locking/retraction system for specifically this Assassin Extension Knife

Please understand that this is just a drawing I made very quick, and is no way accurate. Again, I am not saying this is exactly how it will work, this is just explaining the idea.




First of all, as Sinza said, the best lock would have to lock the blade, not the cover or anything else. The lock is just a bit of metal bent so as to press upon the back of the blade (it can also be made wider and sturdier)

As the video showed, extension is not a problem. However, retraction is. The technique of retraction would require the lock to be lifted as well as pull the blade (all with one hand, of corse :) )

So, have the retraction string go through the lock, so it will stretch up as the string is pulled.

----
To the observant, you would have already found a few flaws.

- The biggest one, I believe, is all the extra slack (I believe the word is,) of the string when the blade is closed.

----

Again, I am in no way of saying that this is exactly how the technique will work. I drew it as to only show the movement of the steps.

To anyone who wants to try and make it, feel free and modify it (which you'll have to)

I would like to see it made it real life

well i think that is preaty coll also

automotion wrote:

On another design i saw not related to this design it looked like it was somehow connects to ur tendons in ur arm because if u look real close in the game u see the guy hold his fingers a certain way and when its not being used his hands look normal.

Its to protect his finger so that it doesn't get stabbed.
The original design in the game had it so you had to cut off your finger.

seems simple!

I'm not sure if i want to buy this, i mean looks goog but i'm think that i prefer to build it by my self!!!!


I'm not sure if I want to buy this. I mean it looks good, but I think that I'd prefer to build it by myself!!!!

tehrapernator wrote:

Its to protect his finger so that it doesn't get stabbed.
The original design in the game had it so you had to cut off your finger.

his finger was cut off as an act of trust and devotion to the assassin's creed. it was habit for him to have the blade come out in place of his missing finger.

Athelstan wrote:

Well, if one looks closely in the game, you can't see a special wrist motion. The blade just springs out as if it was moved with Altair's thoughts. I thought about tensing up your arm muscles, but then the blade would probably be activated any time anywhere when you need your arm. Now I think the developers haven't quite thought about how this blade could work in real. And to make a working Assassin's Creed hidden blade, that works without moving your wrist or finger is quite difficult I think

And the construction pictures of this blade with the ring on the little finger don't coincide with the game. Altair keeps his fingers clenched. You can also see a very good animation of the blade in this (very cool ) video at 00:45:

well i always thought that there was a pressure plate right on the wrist but boy was it wrong but it could work that way. and in the movie it almost looks like it has a tiny silent motor or something like that since the circle thing moves but i could be wrong

Video didn't run when I clicked on the quote version.

wish I just had the link in text form.

i used this provided by sinza but i havent started building yet. i dont get how the blade comes out the sleeve (red) so could someone explain that to me. and i dont know what that fart is for (blue). and i dont understand how to put that locking mechanism in or how it works (yellow). i though of putting a tiny wheel there to have it move easier and i thought of putting in a second string to release the door like locking mechanism and maybe attach both strings to one ring (enlarged square). could some one please explain all of this to me. thanks. and i plan on making it out of wood for my first time so as not to waste metal.
thanks
-weaponeer in the making

jerryk25 wrote:

Video didn't run when I clicked on the quote version.

wish I just had the link in text form.

https://www.youtube.com/watch?v=vcE8xJkK6t4&feature=related

i found this video. it shows that there are gears and also i thing a lazy tong or a scissor jack. i just thought some one could make something of it since i couldnt
it looks like he pressed a button

This helps so much, Thanks!

comment on the video post by finisher90

Seems like a lot of machinery to get such a little blade in your hand.
I have a gravity blade that is bigger, and simpler.

( Dont' get mad, I like the romance of the assassins creed xiphoid, just teasing )
----------------------------------------------------------
Sinza, thanks for the link


I think I like the appearance of the old drawings, that show a scizzor jack thru a housing,
more than this version with the round thing on the end, all enclosed.

This version with the round device at the base, seems a little too modern.
When I think of 1450, pre-columbus, there were no french wheel-lock pistols yet.
there were no machine shops, no lathes, you couldn't get a modern metal file.

I think the scizzor-jack design fits more with the original story.
Like a blacksmith made it, not a machinist.

nice concept

Black smiths where the first machinist. They where able to etch steel and create very small pins for chain mail. They created gears and springs. Hell most older clockwork was completely hand made.

jerryk25 wrote:

comment on the video post by finisher90

This version with the round device at the base, seems a little too modern.
When I think of 1450, pre-columbus, there were no french wheel-lock pistols yet.
there were no machine shops, no lathes, you couldn't get a modern metal file.

I think the scizzor-jack design fits more with the original story.
Like a blacksmith made it, not a machinist.

Well the Assassins were more advanced and they even created a tiny pistol attached to your wrist and I know it's fiction but that's the story.

Actually, "arma de fuogo" goes a bit more back than the 1450's. Try the 700 AD :Dhttp://en.wikipedia.org/wiki/Firearm maybe not the most advanced firearms in the world but it's certainly possible in theory to have what Ezio did in the game. It's not like we know everything the US military has atm. Who knows what space-age gizmos they've got... ..but yeah, propably fiction

I suppose so, Persia had some pretty good technology in 1200.

I didn't want to sound like a troll.
I'm the same way about James Bond, the technology has to be plausible,
unless it's for humorous break in the action.
This Enzo guy must have been a millionaire, and world traveler, James Bond of his time.

I was thinking more like, "what is the current standard technology"

Just like there are "signature guns" with electric owner identifier safeties,
they are not commonly issued yet.

I mean, "the Three Musketeers" wouldn't be around for 100 more years.
I could buy into them having clockwork wheel-lock pistols.

I read the book "Assassin's creed: Renaissance" and it's basically the storyline of the game AC2, but with more details. It said that the Hidden Blade was activated when ezio flexed his arm. I think that's pretty crazy!

That would be cool if it was possible, but it really doesn't seem that way.

To pick up any distance movement from the flexing of ones arm, it would take a fairly large set of swinging arms to produce any usable angle to drive a mechanism or release a switch. That, and the pressure on the arm required in order to get resistance from the muscles would be very uncomfortable, not mentioning that it could cut off your circulation. That book, I'm sorry to say is about as realistic as surviving a 200-foot drop into a haybail.

@jerry,
well his family was quite rich, and he was friends with DaVinci, who would be making those "experimental technologies", not to mention that he envisioned/invented the machine gun and tank centuries before they were actually "invented" and used in the modern world.

Hey guys this is my first real post and I was just wondering if the idea I thought up today was any good. I would also post a picture but my computer isn't working properly so I'll try to explain it as well as possible.
okay so my idea is to have a simple small box which is a bit shorter than my forearm and fairly thin. Inside of it I shall put a scissor jack about 4/5 of the length down which is attached to the actual blade at its other end. On the end closer to the back I am going to put two wires which attach to the ends of the scissor jack. these both pass through a small hole which puts them adjacent to one another. These then go around a small pulley system which is located at the back of the box. The wires then move to another pulley, followed by a third pulley which attaches to a ring. This allows the holder to pull their wrist back, similar to the assassins creed style, which will pull on the wires causing the scissor jack to extend out of the box. Also, so that the blade comes back in, there would be two springs on either side of the box which connect to the top of the scissor jack so that when the wearer puts their hand back down and relieves the tension on the wires, the springs pull the blade back in.


Sorry if this isn't very well explained but if you could help me out or if you don't understand my thoughts please tell me so I can modify it. Thanks for any help you can give me. It is appreciated


OK here's a pic. Sorry it's so bad. I'm not great with paint. I hope you can understand it. Thanks again, and any feedback is helpful.

@ Jeevess

That idea is pretty good but it has no lock system. Though it could be a pretty good prop or something to show off to your friends. And remember keep trying, don't give up, and learn from your mistakes.

Oh cool thanks. I dont know if my lock system is bad but i had it more along the idea of when i had the ring pulled the blade would stay out but when i released the tension it would slide back in.

Hey guys, I'm also a new guy, and I love building things...anyways, I like the scissors jacks idea, but wouldn't it be too weak for any "practical" use? I was thinking about maybe a locking system to where the blade assembly would slide into a slot or something for more strength...

Yeah i can see your point but at the same time i want one which is dual action so i can open and close it with just the twist of my hand. I dont really know how to make it strong in that scenario though. Any ideas would be appreciated.

comment on strength of scizzor-jack vs end lock mechanism.

A couple of general statements, made from other machinery observations.
Not specific design requirements.
Ignoring one comment is okay if a substitute condition rectifys the problem.

1. Metal is metal, the same design can be built flimsy or solid.
Scizzor-jacks can be so stiff and tight and thick, the blade will not extend at all.
Or they can be like a clown's boxing glove, with a lot of wiggle.
The problem is, making it streamlined, there is a trade-off, size vs. strength.

2. Each hinge or joint connection adds tolerance creep, (sloppy fit)
Because of this, a scissor-jack is a better extender, not a lock.
Think of it as a spring bottom "X" and links with hinge points.
If you put a lock on the end of the jack, far away from the blade, the blade will wiggle.
So a lock must be put closer to the blade, (fewer hinge points) to make it stiff when open.

3. Wedge fit. the difference between a microtech OTF halo and a china clone is wedge fit.
A microtech blade is loose in the track, when closed, but gets to a tight fit, at the throat.
Whereas a china clone, has a loose fit the entire length of blade travel.

4. a scizzor-jack has a fixed ratio, folded height vs. extended length.
but can transfer strength farther than a simple spring.
A coil spring on the bottom jack can be set to have 100% max force when closed.
and when the jack extends, the coil will only partially unwind, 75% power at full open.
But a compression spring will run out of power, 0%, the more it opens up.
If you pick a spring big and long enough, it may have "end length power",
but you will have size problems when it is closed (compressed).

OK thanks for this man i can see the downside of using the spring jack but at the same time the benefits. I'll try to get get the size to strength ratio right in the first place. I'll make a few thanks for that

I watch Sinza's opened extension knife pics over and over again, and every time I see I wish bang my head in the wall. It's really simple, so simple that I think: "how could I not have an idea like this before?"

Doesn't matter (to me) what other says, but:
- the simplest design...
- the less little movable parts the blade has...
- less locks and springs and etc...
....the final result is more reliable and rugger. And functional.

I still amazed............

Nice sinza! I am kinda new to this site and I have built one hidden blade it is a one way but I am satisfied with it... I am building a new one so if anyone has any input and is willing to give it, I will be very happy!!!


I know it sounds strange but what if Ezio has cables or something along the lines of that attached to his tendons in his arm... that would explain why we see him flex his arm and the blade ejects and retracts... any input??


.

Hi everyone, first time poster, short time reader.

I'm beginning my first hidden blade attempt at the end of this week (however due to legal reasons in this country, it will have to be non-lethal)

I'm looking at using design originally created by sadisticotaku (see https://www.youtube.com/watch?v=469rC0urep4) then combine it with a DA OTF mechanism.

I'm also planning a two stage trigger system using a finger ring-pull trigger. The plan is when you pull the trigger a little it will release the blade, then cocking back the wrist will retract it.

Still looking through the posts to see if anyone has attempted this before. I would really appreciate any feedback on this.

mrpwpoita wrote:

Hi everyone, first time poster, short time reader.

I'm beginning my first hidden blade attempt at the end of this week (however due to legal reasons in this country, it will have to be non-lethal)

I'm looking at using design originally created by sadisticotaku (see https://www.youtube.com/watch?v=469rC0urep4) then combine it with a DA OTF mechanism.

I'm also planning a two stage trigger system using a finger ring-pull trigger. The plan is when you pull the trigger a little it will release the blade, then cocking back the wrist will retract it.

Still looking through the posts to see if anyone has attempted this before. I would really appreciate any feedback on this.

Please, we know what the ring mechanism is. And a lot of people have attempted these designs before :/

Sorry, just trying to detail.

OK, sorry this is a long time late, but you have got the whole working of the assassins creed actual game blade wrong. I and a bunch of my friends agree on this. The player of the game has to flex his arm in a certain way, and the flexed muscle pushes a button. It's not actually connected to the arm tendon!!!!!!!! This design would be more reasonable and easy but you would have to make it so that it doesn't accidentally pop out, maybe a distinct movement?

The problem with a button pushed by flax one's arm, is that the distance that the surface of skin moves is infanticimal as counteracted by the amount of give that flesh has. Unless of course the apparatus is tight to the point of constricting circulation. As well the max amount of flex in your arm is likely the same as that when you are lifting your own weight (which puts this previously discussed mechanism back on the shelf because the Assassins like to parkour).

PS Shadowhound correct me if I'm wrong, a period comes after a parentheses, right?

Ethaksus wrote:

PS Shadowhound correct me if I'm wrong, a period comes after a parentheses, right?

How the hell should I know?..... Do I look like some kind of "Grammar Cop" or something? ..


I believe that a period is needed after the parentheses, if the thought being parenthesized is included as part of the sentence, (like in this example).


If a period is placed to end the sentence before the parenthesized thought, then no additional period is needed. (as in this example here)


(And an entire parenthesized thought that stands alone, needs no period at all)


The sentence you wrote that prompted this reply, did not have a punctuation mark to end the sentence before the parenthesized thought, so the period placed after the parentheses was used correctly.




Shadowhound



P.S. I didn't look the answer up on purpose, so if I'm wrong you can all point at me and laugh.

I have found the answers!
...and you're mostly right.

Periods go inside parentheses only if an entire sentence is inside the parentheses.
Examples:

Please read the analysis (I enclosed it as Attachment A.).
OR
Please read the analysis. (I enclosed it as Attachment A.)
OR
Please read the analysis (Attachment A).

congratulations!
You have successfully avoided worldwide humiliation!

Ethaksus wrote:

That would be cool if it was possible, but it really doesn't seem that way.

To pick up any distance movement from the flexing of ones arm, it would take a fairly large set of swinging arms to produce any usable angle to drive a mechanism or release a switch. That, and the pressure on the arm required in order to get resistance from the muscles would be very uncomfortable, not mentioning that it could cut off your circulation. That book, I'm sorry to say is about as realistic as surviving a 200-foot drop into a haybail.

Actually, it could be done with a pressure plate and the ring system most people have been using. Simply put, extending the hand backwards with a ring attached would move a latch, that latch would remove the "safety" on the pressure plate, which would then activate the release mechanism for the blade, which would then have a rear latch to keep it in place until the system was activated again.
However, this is fairly impractical and there is an easier way to do it using springs and a ring latch system similar to those already in place.
I'll be building my own using some ideas others have come up with combined with my own ideas and an attempt to make it much more compact(goal is just under an inch in thickness, 7 to 8 inches in length).

dr490nw4rri0r wrote:

Actually, it could be done with a pressure plate and the ring system most people have been using. Simply put, extending the hand backwards with a ring attached would move a latch, that latch would remove the "safety" on the pressure plate, which would then activate the release mechanism for the blade, which would then have a rear latch to keep it in place until the system was activated again.
However, this is fairly impractical and there is an easier way to do it using springs and a ring latch system similar to those already in place.
I'll be building my own using some ideas others have come up with combined with my own ideas and an attempt to make it much more compact(goal is just under an inch in thickness, 7 to 8 inches in length).

No, but think about it.
So you have whatever pressure plate system you want, in any case you would need to keep the plate close to the users arm. You would therefore attach a spring or the like. For the degree of resistance needed to pick up movement, your circulation would be cut off, and your arm would fall asleep. Which is really bad if your trying to use it for various tasks.
But, I would like to take a look at those pics on how to solve this problem, they could contribute to an even better solution.

I attached a spring to the bottom of a slide, then to the back of the base. When you pull on the blade with the ring you have to keep your hand outstretched because when you close your hand the spring returns to its normal length, giving the retraction. This diagram may help what I am trying to say. I just need help with a locking mechanism so I don't have to keep my hand out flat.

S3kShUn8 wrote:

Hmm..... sounds..... like that could be painful

But i think the biggest problem is coming up with a way to get the damn mechanism to open AND close using one hand. And then you have to think about how practical the design is so that, if you just happen to be wearing it in your local super market or something, you dont have a 13" knife come shooting out of your sleeve when you reach out to grab something.

If you make it a metal spike, like a skewer, you could go to the grocery store and walk out with a shishkebab ready to go.
Alternatively, you could sell it as a grilling accessory.
Good idea in a way-not only is the thing a cool knife, but that idea could be used to make money.

idk if this is in the correct forum but it fits for all xiphods, is there a way to make a lock that holds it in place but can then be tracted automatically like in the assassin's creed games

koriozu wrote:

idk if this is in the correct forum but it fits for all xiphods, is there a way to make a lock that holds it in place but can then be tracted automatically like in the assassin's creed games

[takes a deep breath]


Koriozu young bro,.... Welcome to the forum. Everything you might ever want to know about the over-hyped Assassin's Creed hidden blade can be found by simply reading the forum topics.

Yes,... There IS a way to make a lock that holds it in place and then can be retracted, (or "tracted" as you put it), automatically. In fact there is a NUMBER of ways to do it.


My advice to you is to spend some time reading through the forum, and check out some of the topics. A good place to start would be the "NEW MEMBER AREA" located at the very top of the topics list.

A complete list of the forum's rules, as well as a list of frequently asked questions and an extensive glossary of terms can be found by clicking on this link to the new member area ...

https://sinza.forumotion.com/new-member-information-f40/

The rules listed there are pretty simple, and they deal with everything from the way members conduct themselves...., to proper use of spelling, capitalization, punctuation and grammar, when uploading messages.

The FAQ section answers a LOT of the questions that new members often ask, (including information on the AC Blade), and it even has a short video to watch that gives further insight into this forum's position on Assassin's Creed.

( The amount of information listed in the glossary is extensive, so don't worry about reading through the whole thing,.. but the information provided in the other two postings is EXTREMELY important and you should read these two posts carefully )

I highly recommend that you review the information provided in these three posts.


You'll learn all kinds of things like,.....

Why we don't use "Text Abbreviations" like "idk" when posting messages.
(They don't translate correctly for members using language translation software, and it's a sign of laziness)

Why we use "Spellcheck".
(So misspelled words like "tracted" can be spelled correctly)

Why words that begin sentences, and titles like Assassin's Creed should be capitalized.
(Because they begin sentences, and they are titles)

And you'll even read about using proper punctuation, like putting a question mark at the end of a sentence that ask a question.


I would also like to refer you to the "SEARCH" box located on the left side of the main page. If you type "Assassin's Creed" or "assassin's creed" or "assassins creed" into this search box,.... it will give you a list of the threads that discuss that specific topic. You should be able to find a couple of listings there that might be able to help you out.




Shadowhound




.

This extension knife is so basic. I can even make it using cardboard and tapes.

Well We look forward to seeing Your finished project and tutorial!

Actually I have made one.

Hi!

I'm about to become crazy, i have this extension Knife, and i'm trying to make it retractable, but i can't, i dont know what the hell i can do, when it is retracted, the blade have a very little place to put any mechanism... Can anyone help me a bit with this? I know it can sound ridicolous, but i want to make it real!

Sorry for my bad english, i'm spanish :S

I'm trying using a spring to retract the blade when it's extended, now i need something to make the ring system (lock system), cause i broke the original to try do something different, but now i dont know what the hell i can use...! >.<

do you think this think could be made into a gravity extender? ive thought about getting one of these before but that i feel would really make it worth the money for me

or i guess it sort of is.. i mean to where it could just retcract by holding a button and tilting up?

Their is a guy on YouTube that was successfully able to make a hidden blade with the circular motion with the scissor jack. If we are able to get him into the discussion, we might be able to figure out what the actually locking and retracting mechanism is.

pankakemix360 wrote:

Their is a guy on YouTube that was successfully able to make a hidden blade with the circular motion with the scissor jack. If we are able to get him into the discussion, we might be able to figure out what the actually locking and retracting mechanism is.

He was a member on here but stopped posting, check out the thread "Analysing Ammnra's Hidden Blade" it has everything you need to know.

Alright thanks

Hii everyone!!! I don't know if you guys already know about this but... I'm gonna give you a "head's up" (update)... some kind of company created a replica of the Ezio Auditore's Hidden Blade... it's gonna be out on 10/30/2012 (October 10th, 2012) this HB is gonna be exclusive for the GameStop(for the ones who don't know, it's a BADASS american store) (like some other products. example: Circle Pad Pro (first thing in my mind)) it's gonna cost 40 bucks (US$40,00) If you wanna see it, Google it, I don't know about link rules here so I don't wanna take the risk... google like this: "ezio hidden blade gamestop" it's gonna be the first link (probably)(you can also look for it in the GameStop website), a GameStop link... there's a VIDEO and A LOT of AWESOME PICTURES... it looks like the one from the game and also has the Assassin's Creed Brotherhood(game)'s vambrace (it looks pretty nice) any question or doubts about how the HB extends and retract... just check the video is the GameStop website...

obs: it's not a real weapon, it's made out of plastic... it extends automaticly (SA-OTF) and you have to retract manually, so don't think about using it for illegal stuff!!

-Be cool and watch out for Templars!!

-------------------------------------------------------------------------------------------
Laa shay'a waqi'un moutlaq bale kouloun moumkine
The wisdome of our creed is revealed through these words...
We work in the dark, to serve the light. We are Assassins
Nothing is True, Everything is permitted...

Arthur, that's been posted on here for a few months now. We've known about it, and it is already out in a few Gamestops. It's a basic SAOTF, and it doesn't have a good locking mechanism.

Also~ Most of the blades that are designed here are just for show and experimentation. We're not stupid enough to use it for anything illegal or even general use. Because once someone does, we're all screwed.


~Nok

Nokteronoth wrote:

Arthur, that's been posted on here for a few months now. We've known about it, and it is already out in a few Gamestops. It's a basic SAOTF, and it doesn't have a good locking mechanism.

Also~ Most of the blades that are designed here are just for show and experimentation. We're not stupid enough to use it for anything illegal or even general use. Because once someone does, we're all screwed.


~Nok

I didn't know it's already out... in the GameStop website, it says: "Release Date: 10/30/2012", anyway... sorry for the "repost", I didn't know there was already a post about it... anyway... I hope it was helpful for someone somehow... I'll be more carefull next time about posting things like that... BYE!!

-Be cool and watch out for Templars!!

-------------------------------------------------------------------------------------------
Laa shay'a waqi'un moutlaq bale kouloun moumkine
The wisdome of our creed is revealed through these words...
We work in the dark, to serve the light. We are Assassins
Nothing is True, Everything is permitted...