Stair Caddy Sketch Model Review

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Presentation transcript:

Stair Caddy Sketch Model Review Carries items up to 50 lbs up and downstairs 2.009 Blue B

Stair Caddy Design For the 36+ million senior citizens

Existing Products AATA International SR 450 AATA International SR 1750

Comparison SR 450 SR 1750 Stair Caddy Mass of Cart 49 kg 175 kg 25kg Power 375 W 500 W 400 W Battery Life 3.5 hours 5 hours Speed .15 m/s (7.9 in/s) .05 m/s (5.9 in/s) .31 m/s (12 in/s)

Testing for Consumer Needs Safety - Slip Not ruining floor material Items not falling out Items not squished Storage

Other Issues Learned Need more testing with treads Turning Radius Force applied to handle Safety Storage Size Driving Downstairs

Appendices

Additional Calculations Total Steps 50 Steps Total Operation Time 50 sec Mass of Front Treads 3 kg Ang Speed .5 rad/sec (~30 deg/sec) Coefficient of Friction of Floor .3-.5 Motor Torque for Main Treads 20 Nm

Size Narrow Staircase 3 Contact Points Staircase 30” 30”

Stair Data Building Codes (Public Areas) Measurements (Residential) Tread length: 9” Riser: 8.25” Measurements (Residential) Tread length: 7” Riser: 8”