BladeStaff

This is a notion I've kind-of wanted to have for some number of years, but there was a problem with it that I could not resolve before now. So...

A nice sharp blade needs a handle. For a quarterstaff, anywhere along the staff is a handle. If you want to manipulate a 2-meter blade like a quarterstaff, then you need a way to grip it safely and securely at multiple locations, *without* interfering much with the sharpness of the 2-meter blade. That's the conundrum to which I now offer this solution.

Since the blade should be expected to be uniform in shape all along its length, except for the very ends (sharp points, of course!), we could imagine a kind of sliding handle (two of them) that closely fits the shape of the blade.

Now we imagine that the blade has a set of shallow notches at perhaps 1-cm intervals all along its length. Each handle would contain a mechanism that by-default latches into at least one and possibly several of those notches. When latched, obviously the handle cannot slide along the BladeStaff.

At either end of each handle are two or three thumb- pushable buttons that can unlatch the mechanism. No matter how the BladeStaff is rotated or gripped, any time a hand is holding a handle, one of those multiple buttons can be accessed by a thumb. Any time both hands are holding the BladeStaff, you can unlatch either handle and move it to a different location along the BladeStaff, and relatch it. I won't recommend unlatching both at the same time without a lot of practice, as that might allow gravity or momentum to pull the BladeStaff out of both handles. Embarrassing, or worse!