This gearbox will transfer power at any angle between 0 and 90 degrees off axis. The mechanism seems to be the only one of its type in the wild. I'm not certain I've named it correctly but they are found inside the pivoting throttle arms of large outboard motors. thingiverse 
For a nearly inexhaustible collection of mechanisms of this sort, check out the books by Ivan Artobolevsky. I would not be surprised if your device is among them. archive