Final Presentation Design Problem Recap Current walker users - PowerPoint PPT Presentation

Final Presentation

Design Problem Recap • Current walker users generally have trouble getting into and out of chairs independently. • The solution for this problem is to come up with an enhanced walker design that allows the user to raise and lower themselves without impeding normal walker function. • The motivation of this project is to give people with motor disabilities the sense of independence in their mobility.

Previous Comments • Make It Cheaper! – Aluminum is already cheap. For ease of construction, will use plastic for lever assembly and linkage rod. • Make It Lighter! – All parts weigh less than 3 lbs. – The walker’s total weight is still less than 10 lbs. • Are the skis a trip hazard? – Stopper/ski made solid to avoid tripping.

Previous Comments • Is the lever subassembly redundant? – The lever creates ease of operation while standing. From our visit to the ALF, users do not want to have to crouch down. Prefer to stand straight up. It is also significantly safer. • Can the mechanical components be further concealed? – No assemblies were found unaesthetic or dangerous enough to require concealment.

Previous Comments • Do these additions limit the collapsibility of the walker? – Our design is still fully collapsible. • Can the lever be actuated upward instead of pulling it downward? – The lever being actuated upwards was not a feasible solution as the motion of the linkage assembly was limited by geometrical constraints.

Final Design vs. Prototype

Working Shots

Working Shots

Complex Parts • Pivot Brackets – Needed the waterjet due to intricate design of parts. • Stopper/Skis – Utilized the 3D Printer as the part would have required custom tooling and extremely precise machining.

Major Prototype Changes • Stopper/Skis were made solid rather than just curved bars • Pivot brackets are screwed to frame rather than welded on – Frame surface is anodized, prohibiting the welding of the brackets. – Final concept would still utilize the welding of the brackets.

Material Costs • Estimated cost of raw materials – $200 – This includes aluminum, steel bolts, silicone for handle grips, and plastic needed for injection molded parts • Cost of walker – $60 • Total cost = $260

Video Presentation

Conclusions • The task of this design team was to perform a design optimization of a walker used by individuals who have trouble rising from and sitting down in chairs independently. • Problem is solved with relatively low cost (<$300), very small added weight (<3 lbs), and no hindrance in walker performance and collapsibility. • With a safety factor of 1.6, our prototype can support 120 lbs.

THE END Any Questions?