Disclaimer: I apologise for the beautiful title image, its not my concept, mine is ugly and sketchy, run away while you can :D
It seems everyone is making hidden blades that just slide out, or blades which retract on impact...
I think spring loaded ones like those in assassin's creed 2 are cooler.
Sadly, I do not have the materials or skills (maybe) to make a functional one, but I'm sure many of you can easily think up a way to make one and have the skills to bring it to life...
This is what I would do if I had to make a hidden blade.
I want to, but nope, suck at metalwork...
Please play along and check out how my idea goes, I think it's feasible although the one in assassin's creed 2 is probably way more complex.
Hoping someone makes a functional one, cos its cool to know that something like that exists.
Step 1: Explaining my lousy concept: Initial lock
-The blade will rest on a rail inside a suitable container.
-It will be spring loaded and held in place with a latch (the spring type) which can be released by pulling a string, maybe attached to assassin's ring finger?
-Brown square is handle which is used to cock the blade back into place, assume that container has a slit along which handle slides when blade is sprung.
-Hole is for holding blade in place in secondary lock stage.