Up-Down Wheelchair 2.009 Silver A

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

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

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

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

Conclusions Technically feasible Cost effective

Thank You

POST PRESENTATION MATERIAL

Hydraulic Design Evolution Design for cheap Decoupled Auto Jack

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

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

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 <http://ezinearticles.com/?Sarcopenia:-As-We-Age-Muscle-Loss-Occurs&id=297128>

Pressure Drive