ONE ARM DRIVE AND LEVER TECHNOLOGY
Statement of the Problem
One armed drive technology may be confusing for some to learn as it is
not necessarily intuitive, and the users generally require good upper body
strength. Alternative steering methods designs must be intuitive and
reasonably functional especially for the elderly population. Despite the
potential benefits of lever drive propulsion; few lever drive wheelchairs
are commercially manufactured or widely used. These wheelchairs tend
to be larger, heavier and more difficult to fold and transport.
Current Solutions
The one-arm drive wheelchair is a manual wheelchair with both handrims
mounted on one side. One arm drive wheelchairs have been available for
some time, and a few lever type drive systems have also been available.
These are generally designed for one-handed use. They are not add on
units and must be purchased as a complete wheelchair. One arm drive
wheelchairs are manufactured by some of the larger wheelchair
manufacturers. They consist of a wheel with two hand rims and the
wheels are basically tied together so that they can be controlled by one
hand. Lever driven or ratchet arm systems have been explored. They
consist of a lever-operated drive attached to the hub of each wheel.
Applying a push/pull motion to the top end of the levers propels the
wheelchair. The user moves the lever forward and backward to propel
the chair and turns it left and right to turn the chair. A number of studies
have shown that lever propulsion is more efficient than handrim
propulsion for paraplegics as well as quadriplegics.
http://www.wheelchairnet.org/WCN_WCU/Research/StakeholderDocs/PDFs/propulsion.pdf