In article ,
"Snag" wrote:

Seems to me everybody is making this way more difficult than it needs to
be . A plastic disc with two rings of thin brass glued to it , holes thru to
solder a wire to the back side of the rings . Mount 'em on the wheel , use a
pair of slot car type brushes mounted to the frame of the chair to feed the
power to the rings . Done deal , and if he wants 4 rings instead of two ,
that just ain't that much harder.
Fer cryin' out loud , I could whip this up outta scraps I have layin'
around in an afternoon !!

Printed circuit board material might be a better approach to the plastic
and metal - it's already well-glued.

Something like bullet catches (spring-loaded metallic, robust) might
make a less fiddly connection than the slot car type springs (are we all
revealing our age by even knowing what those are, or are they still
around these days?) Probably want a capacitor on (in) each wheel to make
up for momentary glitches owing to lack of perfection. Also want
something to cut the contacts off from power before it's taken apart and
loaded in a car trunk. Carbon brushes would work better when assembled,
but are not very rugged apart.

--
Cats, coffee, chocolate...vices to live by