1. Motorized Wheelchair Mount
Client: Andrea E. Johnson, CASC OTR/IT
Advisor: Thomas Yen, Ph.D.
Team
Tyler Lark - Team Leader
Nick Harrison - BWIG
Dustin Gardner - BSAC
Richard Bamberg - Communications

2. Outline Background Problem Statement Design Constraints Design Ideas
Design Matrix
Future Work

3. Background Information
Cerebral Palsy
VANGUARD PLUS®
Speech generation device
Increases independence
Temporary mount is unsatisfactory
No current commercial devices

4. Problem Statement Cannot drive with current mount
VANGUARD® blocks vision
Motorized mounting system
Must not impair vision
Stows safely
Accessible while in transit

5. Design Specifications
Motorized – minimal client input
Vanguard accessible in transit
Stored safely and within chair perimeter
Powered from wheelchair or independently
No interference with current functions
Budget: $1000

6. Design 1 - Shoulder Mounts to seat or armrest
Stored behind left shoulder
Moves forward for operation

7. Design 1 – Shoulder Pros Cons Stored out of sight
Mechanically feasible
Cons
Likely to get hit
No quick access
Mounting difficulty
Disliked by end-user

8. Design 2 - Side Stores under armrest Slides outwards
Unfolds into position
Mounts on base

9. Design 2 - Side Pros Compact storage No vision hindrance Cons
Extends chair perimeter
Damage prone
No transit accessibility
Mechanically complex

10. Design 3 - Lap
Stows in lap
Mounts on base
Swings over joystick

11. Design 3 - Lap Pros Cons Accessible in transport
Operational while stowed
Stows safely
Mechanically feasible
Impedes desk use
Hinders exiting chair

12. Design Matrix
Accessibility in Transit
(30pts)
Stowage Position
(25pts)
Feasibility
Deliverability
(10pts)
Cost
Total
(100pts)
Behind Shoulder Position 10 18 15 7 8 58
Under Armrest Position 22 5 6 51
Lap Position 28 20 9 87

13. Final stowage position:
Future Work
Final stowage position:
Tucked into lap (screen up)
Proposed Design Mechanism:
Screen rotates 55-degrees
3 rotary cuffs, 1 linear actuator
Concerted stowing motions (elliptical, pan/tilt)

14. Usability Testing Tests to run for designed mechanism:
Stress and strain testing (Reliability)
Load testing (Optimize torque)
Motion testing (Stowage effectiveness)
Electronics testing (Automation/Power source)

15. Questions??