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Any wheelchair users here who are "all shook up" by caster shimmy?

April 4 2012 at 9:25 PM

Steve in NC  (Login pneuguy)
GM

Anybody who's tried to take a standard manual wheelchair (e.g., by coasting downhill) much beyond a fast walking speed (i.e., 6 or 7mph), knows about (and hates with a passion) the annoying gyroscopic instability that creates caster shimmy. I know I do - and do.

Scholarly papers have been written about wheelchair caster shimmy.

http://www.rehab.research.va.gov/jour/84/21/2/pdf/kauzlarich.pdf
http://www.rehab.research.va.gov/jour/00/37/3/pdf/kauzlarich.pdf

But I've never been able to find a practical commercial product that addresses the problem. So here's a DIY one.

This simple gadget (actually a pair of them) totally and absolutely eliminates it. It consists of a nylon worm-drive hose clamp (McMasterCarr # 5471K1) threaded through a length of vinyl tubing (McMasterCarr # 5103K35), wrapped between the caster downtube and fork - one for each side of the chair.

[linked image]

Details on request. Wear a helmet. happy.gif



Steve

 
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