up-down wheelchair 2.009 silver a. design specifications requirementsattributesspecifications...
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Up-Down Wheelchair2.009 Silver A
Design Specifications
Requirements Attributes Specifications
Reach Lift System Seat height 9-33”
Safety and stabilityWheel brakes,
Sliding bearingsHandles 100kg
without tipping
Weight Hydraulic jack 1500N force output
Standard mobility Modified chassisMeets 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: 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 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
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Drive Piston
One Way Check Valves
Response Piston
Manual operation Pressure Release
Reservoir
Pressure Drive