Another Design For Your Consideration

[GraViTaR]

When the rod with the two small wheels reaches 6:00, a latch catches the rod and holds it in that position. when the opposing wheel hits the ramp at 9:00, the latch releases at the 3:00 position and allows the rod to shift back in the other direction.

[AB Hammer]

GraViTaR

You will have a jam directly at the top of your ramp, and rod in tubing only work in direct force. You have an indirect force at your tubing witch causes high friction. Someone else has a 2 arm sliding unit that they patented in 2001, and I don't know how they got it through for it has a similar problem and doesn't work. But people have been able to ad a solenoid  to make the shift making that type work, but it needs help from other energy to work.

[GraViTaR]

GraViTaR

You will have a jam directly at the top of your ramp, and rod in tubing only work in direct force. You have an indirect force at your tubing witch causes high friction. Someone else has a 2 arm sliding unit that they patented in 2001, and I don't know how they got it through for it has a similar problem and doesn't work. But people have been able to ad a solenoid  to make the shift making that type work, but it needs help from other energy to work.

Maybe YOU will have a jam, but not me. It does not have to necessarily be a rod in tubing. It can be a set of roller bearings . Besides, the wheel itself has a large mass and it's inertia perpetuates the rotation with the double wheeled shaft just going along for the ride and keeping more weight on one side for the down swing. Come on man! Use your intuition!

[GraViTaR]

This one needs no latching mechanism:

[acp]

Okay, how does the weight which has been pushed towards the axis get pushed out again as it approaches the top? something has to reset the weights to their original position, i.e at the maximum extent. At the moment after one complete revolution, both weights will be in the position closest to the axis. dead end.