This is AWESOME, I came across this searching for designs that were close to mine, and well...
Although, mine uses an electric motor attached to a notched iron dowel that launches the blade forward, the sound it makes gives it the nickname "Zipperblade".
but that is from assassin's creed! what you need is originality.
It could be from Assasin's creed, Hellboy, Blade, or several other movies; so it is pretty low on the originality scale. I mainly wanted to show how such a device would work. I was slightly perturbed by the fact that Altair's hidden blade was able to operate without ever being manually reset, which would be necessary if it were spring powered.
This artist has not been scouted yet.
You are free to copy, distribute and transmit this work under the following conditions: