Help Me Understand Dog Shifting

[Crazy]

For some reason, I have the misguided conception I can design a shifting gearbox for my team this season (I blame the mentors.) I understand a lot of the math behind it, for finding optimal ratios and whatnot, and I know Inventor well enough to design it in there, but there is one big problem: I don't understand the geometry behind the actual shifting.

To the best of my understanding right now, a piece with a couple elevated parts is pushed into a gear with a corresponding milled out parts so that it engages the gear (this is possibly entirely wrong), and when the pneumatic is shifted, the other side of the part does the same thing with another gear; when either gear is not meshed, it is idle. A terrible mspaint of my current understanding is attached.


My problem at the moment is that I don't understand how the pneumatic goes through one gear (I'm assuming it's actually through the shaft?), how to keep the gears from moving if they are on the same shaft as the dog shifter (or maybe they are on different shafts...that idea occured to me but seems intiuitvely wrong), and how to keep the gear from moving.

I've looked through a number of whitepapers on this, in partiuclar whotek's, but the cramped shop drawings aren't really letting me understand what's going on. If anyone could either explain the geometry of how all of this works or link me to an inventor model rather than drawing of one, it would be greatly appreciated. Thanks!