Charles, it looks like a good idea. most of my questions are related to the design process...

Assuming the ball is a bowling ball, does the socket parts end up scoring the surface of the ball? will the ball become "rougher" over sustained use, and therefore more "clicky" in the positions it locks in, or have reduced locking power as it wears (possibly unevenly)
The locking mechanism seems to have a swinging pivot, and actuate at the bottom. Is the mech at the bottom tolerant of grinding dust, etc? is there a maintenance load/lubrication regime needed for continued service life?
I notice the piece of wood under pedal (temporary travel stop?) - is there an issue of overtravel? what effect does that have on the system?
Is there a minimum weight needed on the pedal to be effective? Should the mech have one pedal to unlock, with another to lock?

I know I'll be wanting one for myself in the future, but when I view with a lens of "in my place of work"... the questions above are what comes to me.

It's a great looking proposition, and I really want to see this available and successful,
Des