Cycler Stability and Load Tests

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3 September 2007

Cycler Presentation Robot - designed and constructed by David Buckley

Height 48inch, (121cm)

Weight 32.5Kg including batteries and covers

Stability and Load tests.

Shelley maximum stable tip angles - Back 15deg. Forward 15deg. Side 20deg.
(The ADA recommended slope for commercial and public access wheelchair ramps is 5 degree incline, see list below)

Shelley carrying 5.5Kg at maximum forward extension for stability.
Note - This is approximately equivalent to 14Kg at beyond arms reach for a normal sized human. (Or 28Kg at arms reach!)

Shelley carrying 56lb (~25.5Kg) at maximum forward and backward extensions for stability.
Note Shelley weighs 32.5Kg with batteries and covers and so is carrying over 3/4 of its weight.

Front ~9.25inch, Back ~5.75inch from body centre line

Wheelchair ramps
A guide to the sort of slopes likely to be encountered in domestic and office environments.

• 1:12 Slope (Or 8.3%, 5 degree incline)

The ADA recommended slope for commercial and public access ramps.
Works for most manual chair users unassisted.

• 1:8 Slope (Or 12.5%, 7 degree incline)

Most unassisted manual chair users can use on short ramps.

• 2:12 Slope (Or 16.7%, 9.5 degree incline)

OK for most portable ramps.
An able assistant required for those unable to power themselves.

OK for strong, unassisted manual chair users.

• 3:12 Slope (Or 25%, 14.5 degree incline)

Stability a concern.
Clearance under scooter at top of ramp needs to be considered.
Works for lightweight chair/user with strong assistant.
Works for loading unoccupied power chairs and scooters.
Only the strongest unassisted manual chair users can use on short ramps.

Data from http://www.wheelchairramps.com/resources-chart.htm