[Jeff Waegelin]

Originally posted by ChrisH


I'd guess it's the big block in the center that moves. The drive shaft has a splined shaft that is currently hidden by the block. The block also contains a splined coupling. When the block moves to the right, the coupling connects the spline to the gear train on the right. The left side freewheels on the output shaft. When the block goes to the left, the left is driven and the right freewheels.

As I recall, the TechnoKats use a similar concept with a different coupling mechanism. Kingman's was also similar.

Actuation is done by the pnuematic cylinder on the left.

Yep, that's exactly how it works. Probably a more clear and concise explanation than I would have given, too.