Users of manual wheelchairs naturally encounter
problems every time they traverse inclines and
declines. First, when traversing uphill,
wheelchairs tend to roll backwards impeding forward
motion. Second, when declining, users do not have
the ability to steer or slow their speed without
endangering their hands.
There is currently a prototype, developed between
2013 and 2014, to solve these two problems. It is
based on a ratchet and pawl system that is
installed onto manual wheelchairs to prevent
rollback with an accompanying braking system.
However, this design is not easily adaptable to the
variety of manual wheelchairs in today’s
market. As a result, it cannot be mass produced at
a low cost.
The goal of this project is to (1) refine the
existing design based on user testing, (2) ensure
that the design can be installed on a wider variety
of manual wheelchairs without custom manufacturing,
and (3) develop a large-scale production plan for
the mechanism. Overall, the resulting design should
retain the ratchet and pawl concept of the current
prototype, cost no more than $200 in lots of 1000,
as well as, weigh below 5 lbs.
As of the completion of the beta design phase, Team
P15007 created a greatly improved anti-rollback
system for adaptation to standard manual
wheelchairs. The system is light, easily installed,
and safe for use by the client. Within the Table of
Contents below you can find information regarding
our process and design work. Of particular interest
is our MSD II section, which contains all of the
final deliverables and design specifications.
Low-cost, Retrofittable Anti-Rollback Device for
Edward Hanzlik, email@example.com
Jack Cholette, Ph.D.
Sponsor (financial support)