Stair Caddy by hR2mHk

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									            Sketch Model Review

              Stair Caddy

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    49 kg        175 kg       25kg
 Cart
Power      375 W        500 W       400 W

Battery   3.5 hours 3.5 hours       5 hours
 Life
Speed      .15 m/s      .05 m/s      .31 m/s
          (7.9 in/s)   (5.9 in/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)
       Tread length: 9”
       Riser: 8.25”
   Measurements (Residential)
       Tread length: 7”
       Riser: 8”

								
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