cross slope compensation for wheelchairs david dar marc c. moore alexander a. abraham advisor: dr....
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Cross Slope Compensation for
WheelchairsDavid Dar
Marc C. MooreAlexander A. Abraham
Advisor: Dr. Mark Richter
The Problem Currently wheelchairs do not have a
mechanism to prevent involuntary veering on cross-slopes
Subjects are forced to apply more torque on one wheel to maintain straightforward motion
Design Criteria Add-on feature to current wheelchairs Cost-friendly Aesthetically appealing Light-weight Mechanically simple Robust, durable
The Solution A mechanism that restricts rotational
movement of a front wheel Forces wheelchair to travel in a single direction
without deviation Applied only when the subject deems it
necessary
Our Design Preliminary model of
the caster wheel Caster features two
surfaces separated by ball bearings
Upper contingent smaller than lower contingent
Our Design Ring with teeth along the
radial and axial axes, which surrounds central post
By default, the spring-loaded ring is suspended above the lower surface
When activated, ring snaps down and locks with lower plate
Concerns Solves problem Mechanism inadvertently activating Reliability - Mean Time Between Failure
(MTBF) Ease of use Warning of hazards
Work Completed Researched ADA regulations Researched wheelchair mechanics (lab visits,
journal publications, etc.) Constructed initial 3-D model Consulted several times with Dr. Mark Richter
(Vanderbilt University, MAX-Mobility) Submitted NCIIA proposal Established project website
Current Work Increasing proficiency with Pro Engineer Forming basic caster model with the CAD
program Using established manufactured caster
designs as samples
Future Work Complete CAD model Manufacture prototype from finished CAD
model Analyze design effectiveness Re-design model and make adjustments
accordingly Implement device alterations
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