Hi,
I was asked to build a larger version of a walking aid bike-like thing for a kid. And I’m looking for some inspiration - I’d like to make it so the the marked bit can be disassembled and looking for some inspiration. Maybe some of you have any ideas how to join these tubes in a smart way?
im imagining an extra sturdy version of a stem/handlebar/faceplate arrangement there, which bolts up for assembly, maybe with a couple QR levers for tool free assembly?
im guessing you’ll need a mechanical provision to ensure it doesn’t slip rotationally, as the “raised axle” arrangement lets bumps in the road (or weight on the saddle) generate torque about that lateral bar, but I imagine its necessary for heel clearance while walking.
Your description exactly matches what I was thinking about, and I tthought maybe there’s a smart solution (and easy to machine) for these constraints
This was a quick thought I had. Maybe you could take inspiration from a stem? A receiving sleeve could be welded into the rear wheel assembly and an interfering wedge to the mating (top?? don’t know what to call it) tube on the front end.
I bet it wouldn’t be too hard to incorporate a clocking feature in there as well.
A first pass at the idea but I’m going to keep thinking on it. What a fun challenge!
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If you need them to be removable or adjustable, why not use an ultrashort stem? Nowadays there are even in-line stems, you could then make some shims if the diameters don’t fit 100%
edit: sorry just read that is what you were looking at 
+1 for using one S&S coupler.