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Self-Powered Lifting Manual Wheelchair

Self-Powered Lifting Manual Wheelchair. 2.009 Green A Sketch Model Review October 5, 2006. Customer Need. Increase COMMUNICATION Extended reach Low cost Low weight Typical Customer: Long-term wheelchair user with upper body mobility Desires independence at low cost

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Self-Powered Lifting Manual Wheelchair

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  1. Self-Powered Lifting Manual Wheelchair 2.009 Green A Sketch Model Review October 5, 2006

  2. Customer Need • Increase COMMUNICATION • Extended reach • Low cost • Low weight • Typical Customer: • Long-term wheelchair user with upper body mobility • Desires independence at low cost • Interaction with family and friends

  3. Market Composition • Wheelchair users in U.S.1 – 1.6 million • Electric Chairs: 155,000 • Manual Chairs: 1.5 million • Demand surveys & local clientele • Independence Technology iBOT • MIT’s Disabilities Services Office • MIT’s Medical Center: Health & Wellness Office • Wheelchair Design for Developing Countries 1. UCSF Disabilities Statistics Center http://dsc.ucsf.edu/publication.php?pub_id=1

  4. Market Benchmarking Invacare Formula TRE1: $1,895 Independence Technology iBot2: $26,000 • http://www.invacare.com • http://www.ibotnow.com

  5. Design Alternatives Require no battery or external power • Compression Spring System • Large additional mass • Counterweight System • Destabilizes chair • Ratchet / Self-Lift System • Extra exertion by user • Pneumatic System

  6. Technical Feasibility • Assumptions: • 100 kg load (Person + elevated chair) • 2 charging pistons • Length of piston cylinder: 15 cm • Diameter of piston cylinder: 5 cm • Pump stroke: 5 cm • Maximum Pressure: 500 kPa (72 psi) • Wheel Rotations: 9 rotations ~ (17 meters)

  7. Issue #1: Stability • Center of gravity location critical • Design options • Retractable back support • Forward-moving seat lift TIPPING ANGLE Regular = 35° 2 ft Lift = 2° STABLE UNSTABLE

  8. Issue #2: Self-Pressurization • Back Pressure → Wheel Torque • Gearing

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