1. Up-Down Wheelchair
2.009 Silver A

2. Design Specifications
Requirements
Attributes
Specifications
Reach
Lift System
Seat height 9-33”
Safety and stability
Wheel brakes,
Sliding bearings
Handles 100kg without tipping
Weight
Hydraulic jack
1500N force output
Standard mobility
Modified chassis
Meets all ASA requirements

3. Critical Issues and Solutions
Hydraulic System
Easy to lift 24”
Compactness
Optimal system
Stability
Smooth vertical motion
Torsional strength
Cost
Manual Chair ~ $150
Electric Lift Chair ~ $3000

4. Design Process Modify wheelchair structure Decouple and modify jacks
Stabilize chair
Integrate components
Bottle Jack
Guided seat

5. Lessons from Model Hydraulics: Stability Ergonomics
Cheap, and work well
Complex to assemble; highly sensitive
Stability
Slider bearings
Torsional links
Ergonomics
Jack placement: handle and scissors
Seat Angle

6. Conclusions
Technically feasible
Cost effective

7. Thank You

8. POST PRESENTATION MATERIAL

9. Hydraulic Design Evolution
Design for cheap Decoupled Auto Jack

10. Stability Solution Scissor jack for vertical and forward stability
Sliding Bearings for lateral stability

11. Cost Fabrication Cost: <$300 Customer Demand: $500
Wheelchair Manufacturing < $150
Hydraulics Manufacturing < $50
Bearings < $50
Assembly < $50
Customer Demand: $500
Typical Wheelchair ~$200
Chiropractors and Doctors dealing with temporary injuries
Libraries and stores desiring extra handicapped accessibility
80% Covered by Medicare for individual users

12. The Hydraulics Reservoir Drive Piston Response Piston
One Way Check Valves
Manual operation Pressure Release
Reservoir
1Sarcopenia: As We Age Muscle Loss Occurs, Ezine Articles
<

13. Pressure Drive