Background: My sister's husband has been down for about 5 months with a deep infection. He has just now gotten back in a chair. Doc says he needs to get off his butt, and prescribed a power wheelchair that tilts to about 45 degrees. It weighs 150 pounds and gets stuck on anything.
They are traveling to UK for several weeks. The power chair is not workable, it cannot be assisted in any way up even a 4 inch step. Hosts have a station wagon which is fine with his usual titanium chair, impossible with the power chair.
I get his regular chair and some materials and make something up as I go.
I pick up a headrest at the wheelchair supply, some A36 tubing at the metal store,
Bike handlebar wrap at the bike shop.
Lower mount picks up the wheelie bar mounts and a couple of bolts to triangulate the load. We weld on new wheelie bar sockets on our lower mount and cut and re-drill wheelie bars. .065 tube is still too heavy so I drill lightening holes.
Upper mount is fastened to backrest uprights at existing tapped holes on the left and right, and clamped to crosstube with nylon block clamp from wheelchair supply house.
Handle/leg assembly. Sorry for the crappy light photos.
Final product. handle is wrapped with cork bike tape. Support rod carries load.
Headrest fits into socket on upper mount, adjust with wingnut.