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 tippingWeight 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 ReleaseReservoir

Pressure Drive