A Clean Hand Device for Manual Wheelchairs March 4, 2004.
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Transcript of A Clean Hand Device for Manual Wheelchairs March 4, 2004.
![Page 1: A Clean Hand Device for Manual Wheelchairs March 4, 2004.](https://reader034.fdocuments.in/reader034/viewer/2022052504/5518bdef550346881f8b5483/html5/thumbnails/1.jpg)
A Clean Hand Device for Manual Wheelchairs
March 4, 2004
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Team Members
• Fannie Black
• Peter Pipchenko
• Jeff Dahlgren
• Mitsunori Kaibara
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Presentation Scope• To review the history of the project and
our four step process work.
• To summarize what we have done and plan to do in the areas of:– Design– Analysis– Verification
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Original Proposal Change
• Sponsor requested us design of a complete “clean hand” wheelchair.
• After consideration of the market niche, we successfully pitched designing an add-on alternative propulsion clean hand device.
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Mission Statement• We will design an alternative propulsion
“clean hand” device for manual wheelchairs that will be inexpensive and fit the most popular wheelchairs in use today.
(Rev. 1)
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PDS Criteria Selection• Biomechanical Efficiency
• Fits Popular Chairs
• Adjustability & Comfort
• Controllability – Braking, Turning
• Environmental Survivability
• Impact Strength
• Size & Weight
• Device Attachment Point
• Customer Installation
• Safety
• Company Cost
• Appearance
(Rev. 2)
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External Search - 1
Gloves Wijit
Handcycle
Motorized
Competing SolutionsComparison
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External Search - 2Analysis Methods
Wheelchair User Statistics Alternative Propulsion Test
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Internal Search - 1
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Internal Search - 2
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1st Critical Step
• We realized designing this device required personal experience with a wheelchair.
• We rented a wheelchair and rode it around.
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Wheelchair Use Learnings
• Your hand really does get filthy!
• Controllability is the highest priority.
• Side space is incredibly limited.
• Adaptability will be key.
• We don’t really have a clue what it’s like, so we must get wheelchair user input.
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Final Concept Selection
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Hybrid Concept
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2nd Critical Step
• We had two meetings with actual wheelchair users.
• We wanted to get their input on our design criteria.
• We wanted to see if they would buy and use our final concepts.
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Wheelchair User Learnings
• They substantially shot down all ideas, because of four main factors:– The motion was too complicated and required too much
relearning.
– The devices stood out too much. Disabled people want to minimize their disabilities.
– No propulsion method gives better control to actual manual wheelchair users than the traditional hand to rim method.
– All they and the sponsor really want is a clean hand guard, without the alternative propulsion aspect.
• Back to the drawing board.
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Human Element• There’s a strong human element in this project.
We’re designing a device that will literally become a part of a person’s body.
• There’s nothing more personal than that, and thus the most important factor in designing this device has to be how the user feels. We had completely ignored this before.
• The user must be consulted as early as possible in the design of any product with a strong human element.
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Revised Mission Statement
• We will design an alternative propulsion “clean hand” device for manual wheelchairs that will be inexpensive and fit the most popular wheelchairs in use today.
(Rev. 2)
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Revised PDS Criteria• Biomechanical Efficiency
• Fits Popular Chairs
• Adjustability & Comfort
• Controllability – Braking, Turning
• Environmental Survivability
• Impact Strength
• Size & Weight
• Device Attachment Point
• Customer Installation
• Safety
• Company Cost
• Appearance
(Rev. 3)
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Revised ConceptCounterbalanced Squeezable Hand Rim Extender & Guard
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Without the lever arm
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Revised Concept
• Wheel Spider Attachment Point
• Adjustable Default Counterbalance Position
• Palm Guard
• Rim Extender
• Squeezable Grip
(Cont’d)
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What We’ve Done• Design
– Concept Brainstorming– 9 Different Concept Models
– A Complete Wheelchair Model from Actual Dimensions
• Analysis– Zero
• Verification– Rode a Wheelchair to Consider Our Concepts– Got Input from Wheelchair Users about Our Designs
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What We Plan To Do• Design
– Material Selection & Part Sourcing– Nuts & Bolts Model (Add Fasteners, Bearings)– Dimension Drawing (Piece Part, Assy)– Plastic Part Mold Model & Drawings (Parting Line, Draft Angles)– Final Concept Refinement
• Analysis– Strengths Analysis of All Components– Machine Design Fatigue Analysis of Bearings, etc.
• Verification– Simple Cardboard Prototypes– Tougher Metal or Wood Prototypes for Actual Use– Testing of Prototypes by Wheelchair Users
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Please ask questions.Thank you.