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TrapperMitch — ACII Xiphoid V.0 Concept
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Published: 2009-11-07 09:17:14 +0000 UTC; Views: 17046; Favourites: 67; Downloads: 455
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Description
So I've been poking around this site where they specialize in such things as arm mounted fantacy weapons of all sorts...so I thought I'd try my hand at reverse engineering the Assassin's Creed 2 "xiphoid," as they refere to it, with what I've learned.Here's my take on project based on what concept art the internet has yet been able to find...not much.
You may note that the pistol feature is missing..That part is a standalone unit that is worn over the blade unit but is not mechanically connected. It's an ingame uprade for later levels different from the one pictured in much of the character art. I have the pistol add-on internals detailed here at this [link]
--UPDATE:
Yay, the game has been released! Boo, I dont have a console or computer capable of playing it on. Yay for internet forum. New concept art proves this blade concept wrong asside from all the other flaws we found! You can find my updated version here at this [link]
--UPDATE:
The abstract is thus..
A ring pulls cord, cord is wound around a wheel, wheel is attached directly to a specialized cam (not drawn but there should be a coil spring to encourage counter clockwise rotation of the cam and wheel).
When pulled the cam rolls a push rod further into its slot extending a lazy tong. There is a relief cut into the rod to allow for an pin, anchored to the housing and to end of the lazy tong, to move.
The next intersection of the lazy tong is attached to the push rod directly, and a compression spring seperates the end of the slot and the push rod to allow the return of the unit to it's closed position once the cam is no longer forcing the push rod to the open position.
There is a lock lever that engages a notch in the cam after a certain pull length. Further pulling of the cam wheel will allow the lock lever to swing to a neutral point and, upon release of string tension and the cam wheels return rotation, will be knocked into an angle that will not engage the notch in the cam.
Attached to the end of the lazy tong would be the typical "Slide block sleeve/blade" unit from the official limited edition AC1 wrist knife.
Picture of that wall of text? See this [link]
--UPDATE: 12-11-2012
Go check out , he built a version of my drawing with a few improvements and omissions.
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Comments: 49
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Scale as you see appropriate to you. The images is sized for an ANSI B sized plot.
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How does the Connector Arm push the cam back in its "Blade is inside" position?
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Ah, it doesn't. The compression spring above the connector arm provides the force to retract the connecter arm. The Cam forces the connecter arm out when rotated but what causes the cam to rotate back to it's retracted position would be a coil spring or torsion spring, the one noted as not pictured in the description of the abstract.
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I'm sure i understood everything except one thing.
I can not figure out the way the blade slides out.
The part not sharp part of the blade is pushed by the lazy tong.
But wich mechanism pushes the the blade itself?
Or is it centrifugal force firing the blade out?
And what is the yellow "string" on the right side of the slide unit?
Greetings from Germany
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It's based on the "Assassins Creed Extension Knife", One of the first "official" Role-play prop knives available from the game series. You can view it here sinza.forumotion.com/t557-the-… . along with pictures of the internal workings.
It uses a sliding block & Sleeve type mechanism where a loop of wire is connected around two wheels affixed to a sleeve and to an anchor point on one item inside the sleeve and to another anchor point on something outside the sleeve. Moving the sleeve away from the anchor point on the outside forces the wire to rotate around the wheels and move the item inside the sleeve in the opposite direction.
Hope this helps!
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I have multiple working blueprints that are nothing like this, I'd like to share a couple of my ideas with you if you are willing to give me tips on creating this blade.
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Thank you for bringing this to my attention.
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You're very welcome ^^ Can I ask your help on something? These concepts you post are really something else, I want to build some with you? I have ideas but no technical knowlegde.
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Yeah, A lot of my technical knowledge comes from tinkering and some from my mechanical drawing education. If ever I had a toy that was broken or a household appliance, I'd take it apart to see if I could repair it...and of course, see how it was put together and take notes of it.
But the key is to get your ideas sketched and documented, no mater how rough. As long as you can understand the sketch and interpret it, you can always go back later and make a cleaner sketch or drawing later.
I'm open to collaboration. What are you working on?
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A better model of the hidden blade. It can be converted to work as the "corvo blade" from Dishonoured, or a bigger version could be made to act as a hidden sword. Inspired by Ammnra. I'm sure you've heard of him. Though the design isn't exactly as his.
Besides that pet project, I'm currently building an ironman suit. Once its done I want to have it be collapsable and/or detachable to an extent. I've got the basics down 
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Fun!
Ammnra's Corvo blade has a similar feel to a US Paratrooper knife and you can find 3d printed version and a assembly video for reference here...
www.shapeways.com/model/108093…
and for more reference with all things wrist actuated, might stop by the Sinza - Exotic Automatic forum. There's a lot of good tech and documentation going on there. Just have to lurk for it.
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Its different, seems like the Paratrooper knife but isn't
I knew about the 3D prints but I can't afford those, I was hoping rather to get a blueprint down then make it out of wood, PVC, or fiberglass.
I'll mooch around the Sinza forums and see if I can find anything. Thanks.
Currently working on the Iron-man helmet. Once that's done I'll have a good go at this!
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I've no advice for an Iron man build but the RPF - Replica Props Forum would be my first guess at finding good ideas.
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I also dont anderstand something .
Could you explayn to me something.
After the blade is out, when you pull the ring, what keeps the blade out of the small casing?
It can slide back again.
Bacause the inside casing is holded by the scissors machanism , but there is noting shown to hold the knife itself.
Help ???
Thank you.
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..see second response to user~nine2103..
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Is it posible that u link pdf files of u r blueprints, that would be so much helpfull 
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Unfortunately, no.
Due to a hard drive failure, I have lost all these .DWG files and am unable to sell my work.
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Just one question, I imported your drawings and made .DWG files and i can't understand how does blade pop out of outer case. I understand scissor mechanism and the movement of it but i can't understand how does blade come out since it isn't attached to any of those parts, it just simply lie in casing. Please if you have answer, that would be great thanks in advance.
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Some time ago there was an officially sold version of Altairs' that operated on a pulley system...where two wheels were attached to the sleeve and running around those wheels were a wire loop that was attached at one point to the blade and, at the opposite point of the loop, to the housing. When the sleeve slid out the housing, the loop slid around the wheels moving the blade out as well.
[link] Visit this link, OP took the one of which i speak appart. Lurk around the rest of the site too, it's very educational to see what has been done and what works/doesn't.
You might also check out what RocknBlock did here > [link]
He's built most of this design in one version but left the sleeve/blade actuation to gravity/friction/momentum I believe. Doesn't speak much English about it but browse his pics, they're well interpreted for everything else in this drawing.
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Just found this video of it in action... [link]
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I am building this from scratch (cutting that metal is tedious, i just picked up tinsnips about 15 minutes ago) and hopefully will be done within a week or two. Even though this is completely illegal to own or make, once it is complete it is legal as long as it stays in your home. when i post a tutorial or pictures, i will credit you and leave a link
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Sorry for double post..
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I am currently making this design (although very low budget) for my own purposes. For the life of me, i couldnt find the perfect way to construct it and although i see a flaw or two it definitely surpasses anything i thought of. When i finish (maybe in a week or so) i will definitely credit you with the design and a link. Sadly, i am making it out of a microvave, besides the blade itself.
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Thanks, very cool of you. How'd it turn out for you?
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how exactly does the Cam and lock work im not fully understandeng how it unlocks sorry...plz message me with the details
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nevermind i clicked on the link
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this...is awesome. nuff said. (:
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Only in theory for someone with an excessively flexible wrist. I've opted for other designs.
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Ah alright; I've been brainstorming for months now to figure out a mechanism that expands and retracts at the pull of a string for this...while trying to avoid the OTF design.
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Sure, might also check out my other drawings
[link]
and
[link]
and
[link]
or run a search for "xiphoid wrist blade" on google to see what has been done (there's a large community working to develop the same and similar devices, much can be learned from reading their experiences)
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Thanks so much; your drawings are awesome. So far I've been looking on the Sinza forum to see what they've come up with. There's one guy that came up with one that can be made with PVC, but because of how it is designed (OTF), I worry if it's still considered "illegal" (I'm in NJ)
I'll have to check with the local precinct lol.
Thanks again!
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Somewhere on there is a discussion about the legality of the thing. There may have been a loop hole about making your own not for sale or carry, if I recall correctly.
Wikipedia defines switchblade as "folding or sliding" and if NJ law defines similarly you may be SOL regardless. Here in CA switchblades are subject to the Federal Switchblade act and are really only obtainable by Law enforcement mostly because, even though switchblades with a blade under 2 inches are legal to own and carry, none are made that meet that requirement.
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Yeah that's what I figured. It seems that no matter what, it might be best to have some boxed cartridge that looks like it, but isn't really like it. NJ is QUITE strict about those laws, so yeah...i'm SOL lol.
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see your updated version, is that mechanism revision 4 ???
are those designs to scale ???
oh and dude these designs are amazing, I am so jealous of your brain for working this out
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hello my name is Alejandro
I like that kind of software you used to design drawing
what is the name? please
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This was made using Autodesk AutoCAD 2010
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this is very nice. i've been trying to make my own hidden blade (i'm short on supplies, tools, and a few ideas) and this made a lot of things clearer. u mind if i use this as a guildline? i don't think mine could be as precise as this tho.
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I tried to figure out how it works, it's just the blade that I don't know how it is pulled up it's not attatched to anything as I understand, can you explain this to me?? thank you.
I am sry for my english.
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It's ney impossible to see at this resolution but there's a wire loop attached at the end of the blade, looped around the two wheels on the sleeve and anchored on the other side to the housing. It's a pulley type thing. When the sleeve slides out, the cord (anchored near the top wheel to the housing and near the lower wheel to the retracted blade base) is pulled around the sleeves wheels as the Housing anchor point moves toward the lower wheel; therefore causing the blade anchor point to move toward the top wheel...extending the blade thru the sleeve.
Hope this helps. Happy inventing.
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Who cares if its wrong. Game designers are more about looks than function. Yours looks like it would work in real life. I haven't seen the game, but I'm willing to bet that the blade in the game is too long to fit in its sheath when its closed.
I would make one change. The bottom left corner of the connector arm should be rounded for a smooth action with the cam.
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I care...as lame as that may be.
Interviews state that Ubisoft did talk to an engineer so to model the ingame one after a working design. Problem is they're keep it under lock-n-key.
A telescopic sleve something like I have here takes care of the disporportionate blade length to fit it inside the unit(think plastic Star Wars Lightsaber).
And yes your rigth that would be a good change.
As far a this one working..yes, I imagin it would too. Problem is the ring pull length and strength needed is not conducive to one handed operation. My new design takes care of that though. Check it out here: [link]
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