I have made most of Arch's trailer.
It is another rucksack frame, the orange bit, that has been 'spread' wider and a few bits of tent pole and a bit of an old crutch.
I added the silver cross members to the rucksack frame and also bent a new end for it. The axle tube will need to be adjusted to suit the wheels that Arch has from her current trailer. I have another pair of QR wheel chair axles that I think I can use with Arch's existing wheels to make then fit the axle tube. But when I have access to the wheels I can check.
The curved part of the rucksack frame needs to go at the front, like a trailer head board, as I need the rigidity there due to the single sided draw bar arrangement. Done the other way around and the frame twists out of shape.
The draw bar is the bottom end of an old crutch that I put in the pipe bender. It fitted nicely in another bit of tent pole that I then drilled holes in for the spring pegs so that the draw bar can be slid in and out. The larger tube will be glued and stainless steel cable tied to the rucksack frame, as will the axle tube.
The coupling end of the draw bar is made from a slightly damaged M20 bolt that I drilled and tapped to M12, in the lathe, and then screwed into the end of the aluminium crutch tube. The ID of the tube was a nice 19.5mm so the M20 bolt threads cut into it and secure it nicely. That allows me to use an M12 rose joint as part of the coupling to hook onto a bracket that will fit on the bike.
So I only need to make up the bike end of the coupling now, a bracket that will fit on the left side of the rear triangle with a vertical 12mm post. The rose joint will be retained by an R clip.
Those will need to be bought in a moment.
Nearly dinner time!
