Moved the tricar spring discussion over here so as not to hijack Mr.B's thread any more than I have. You'll see what was talked about on the Boardtracker and Vintage Motorized Bicycle thread under Mr B"s Excalibur '09 posting.
I was sitting here yesterday afternoon thinking about what Mr.B had talked about joining a trailer spring leaf on the bottom of the spring that holds the seat in place to a newly made upper spring. I had looked at new trailer springs trying to figure out if they could be worked into the plan but gave it up as unworkable.
His plan has opened up a whole new way of thinking and while I was planning a way to do it I remembered a trailer that I had cut up 5 years ago and the only things I kept were the hubs and the springs and after looking at them the top leaf will be about perfect.
Mr.B's plan called for riveting or bolting the cut off end of one spring to the top half of the spring. A rod will go from side to side on the seat and on the foot rest and the eyes of the springs will slide onto the rods so that the chair is suspended on the springs and would give a smoother ride to any passengers your carrying by letting it rock back and forth.
The springs I have are 1/4" x 1-3/4". I'm planning on making a mould of the shape and clamping the steel to it and hammering it to help it keep it's shape. I wrote about my plan in Mr.B's thread and you can read about it there. Two layers of 1/8 x 1-3/4 hot rolled steel will be used to make it easier to form.
Mr.B drew up some plans about how it would work and I pilfered them and brought them over here.
Steve.
http://motorbicycling.com/attachment.php?attachmentid=54400&d=1355467291
http://motorbicycling.com/attachment.php?attachmentid=54401&d=1355489251