Wheelchair
Drive Development
Electric
wheelchairs are expensive and awkward to transport, but many of the UK's 400,000
manual wheelchair users (both self-propelled and those dependent on an attendant
or carer) could benefit from power assistance. Lockton
Motor Limited is developing a detachable add-on unit, providing power,
steering and braking at a lower cost, to fit 70% of manual wheelchairs. An
attendant can walk alongside the chair, improving the experience for
both parties. With both user control and attendant control modes,the unit
can be swapped between chairs of users with very different capabilities -
for example in a hospital or nursing home. Prototypes built so far (see gallery)
test configurations and motor/drive systems, including brushless motors, high-torque
hub motors and regenerative braking to conserve battery life. The Wheelchair
Drive project has so far won the 2004 Motion
Drives & Controls Award for Engineering in Product Design and a 2005 Cambridge
University Entrepreneurs' New Business Idea Award.
Any comments or suggestions will be gratefully received - dan@danlockton.co.uk.
Idea
summary [CUE, 2005, PDF, 7pp, 1.3 MB]
Full
project report [Brunel, 2004, PDF, 170pp, 7.7 MB]
Prototype
image gallery
Future Vehicles
Technological
advances need not lead solely to bloated and over-complex vehicles. By appropriate
use of technology, utility vehicles with an emphasis on sustainability and
open source principles will benefit communities and permit economic development
not only in the developing world, but in the West too.
As an ongoing project, Lockton Motor Limited is designing
an ultra-lightweight commercial vehicle in the spirit of the original Reliant
(summary),
and has also published a Creative Commons-licensed paper, Motor
Vehicles in the developing world: options for sustainability [PDF,
19pp, 320 kB].
Experience
Dan
Lockton was a member of the UK design team for the A-Bike,
the world's lightest folding bike, coming soon from Sir
Clive Sinclair and Daka
Designs, Inc., and for the Sinclair Research ZA20
WDU, a compact motorised assistance unit for wheelchair attendants and
carers. He is also author of Rebel
Without Applause, the first detailed history and analysis of the Reliant
Motor Company, one of the world's leading specialist vehicle manufacturers,
and is currently researching architectures
of control in design.