Reply to ""flip flopping" a switch"

Coming from an electrical background myself, I can see how latching a relay would work - but I think there's an all mechanical answer out there, though it would require custom parts and such. 

I keep thinking of marble runs - there's a device that does the motion we require, passes one direction, while setting itself for the opposite motion.

https://www.youtube.com/watch?v=oP1eIqCFhMo

Also one sprung switch wouldn't work, for the reasons listed.

But a Wye of sprung switches sends the trolley down both the legs in question - the problem here is, it doesn't go all the way to the top on one path.

Assume all switches are sprung to the right. The star indicates what I would normal consider the end of the line, from which the 2 routes diverge. As you can see, leaving from the bottom left, the trolley doesn't go to the star before heading to the start. 

 

EDIT

 

I think I got it. We mentioned putting a switch button on the COMMON bumper-

Instead, put switches on the end of routes A and B, and wire it so it sends power to flip the switch the opposite way.  Trolley goes down route A, hits bumper/switch, power sets switch for for route B. Trolley rolls though the switch, hits bumper and reverses, goes down route B. Repeat.

1200px-Wye.svg

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