An application for square gears. Well, it works so I guess that is technically true. It does crush cans.

But all that mess of square gears is doing is translating the constant rotary motion that the gear box which probably contains a standard worm gear, from one end of that bench or trailer to the other. Since there is an odd number of square gears in the train, although the even numbered square gears do accelerate and decelerate, the odd numbered ones will all have the same, constant motion as the output shaft of that gear box. So the fact that they are square gears is totally unnecessary. Round gears would have done the same job equally well and would probably last a lot longer in use. The second square gear on the upper level is completely unnecessary and could be removed with no change in the action.

In fact, gears are not even needed and a much simpler way to transmit that constant rotary motion would have been to just use a belt or chain drive which would be a lot less expensive and more reliable.

But they do look neat. Sorry if this bursts anybody's bubble.