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Rullstol I
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2014 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Wheelchair I (English)
Abstract [sv]

är en expedition planerad att äga rum 2016. Målet med exeditionen är att fyra rullstolsburna äventyrare ska ta sig upp till Mount Uhuru, den högsta toppen på Kilimanjaro. Projektets uppgift var att konstruera en rullstol som dessa äventyrare ska använda för att bestiga berget utan extern hjälp. Resultatet är tänkt att användas av Operation Frihet i första hand, och kommersialiseras som en eventuell fortsättning.Terrängrullstolar designade för lutningar är ett orört område, vilket ledde till att genomförda undersökningar istället granskat liknande användningsområden. Efter en problemanalys togs tre huvudproblem fram; att stolen välter på grund av lutningen, hur stolen ska bromsas och hur stolen ska drivas effektivt samt eventuellt behov av alternativ drivning.Konceptutvecklingen utgick från dessa problemområden. Istället för att fokusera på ett koncept för hela stolen beaktades istället problemområden som separata delar vilket genererade flera idéer för vart område. Verktyg för produktveckling såsom QFD, strukturvariation och elimineringsmatris användes för att komma fram till ett koncept. Huvudproblemen löstes genom fokus på låg tyngdpunkt och vikt, med inspiration av terrängrullstolar och terrängcyklar för komponenter.Stolen konstruerades efter flertalet faktorer, viktigast av dessa var en vuxen mans anatomi och Kilimanjaros genomsnittliga lutning. Konstruktionen resulterade i en stol på 4,6 kg, alltså endast 100 gram mer än lättviktskonkurrenten, Panthera X vilken stoltserar med att vara världens lättaste rullstol. De flesta krav som ställdes på produkten i början av projektet i kravspecifikationen uppfylldes helt eller i teorin, då somliga endast kunde avgöras av fälttest.Stolen var efter projektet färdigkonstruerad i grunden och skulle kunna komma att bli en stark utmanare och värdig aktör på marknaden.

Abstract [en]

The project was commissioned by Operation Frihet, under the leadership of Jonas Gustafsson. Operation Frihet is an expedition, scheduled to take place in 2016. The purpose of the expedition is for four adventurers bound to wheelchairs to climb Mount Uhuru, the highest peak of Kilimanjaro. The assignment of the project was to design a wheelchair for these adventurers to use in their ascent without any outside assistance, using only their own physical ability. The result procured is meant to be used by Operation Frihet foremost, and commercialized as a possible continuation.Wheelchairs designed for use in mountain terrain with the ability to tackle inclines is an unexplored territory. Therefore different areas but with similar properties was been investigated.After an analysis of the possible problems encountered on the climb three main problems were formed. The problems consisted of the chair tipping over because of the sloping surface, what type of brake mechanism should be designed and how the chair should be operated efficiently. There would also be a need for a alternative propulsion, in case of heavy terrain or steep slopes.The development of a concept was based on these problem areas, but instead of focusing on a concept for the entirety of the chair multiple concepts were generated based on each problem area. Product development tools such as QFD, structural variation and elimination matrix were used to reach a concept. The main problems were met by focusing on low center of gravity and a low weight, with inspiration from the components used in terrain wheelchairs and mountain bikes.The chair was constructed after various factors; the most important of these is a grown man's anatomy and the average slope of Kilimanjaro’s surface. The design resulted in a chair of 4.6 kilograms, which is only 100 grams more than the lightest competitor, Panthera X, which takes pride in being the world’s lightest wheelchair. Most of the demands made on the product in the specifications chapter have been met in full or in theory, since some will have to be determined by tests in the field. This would only be achievable if the manufacturer chose to sponsor the expedition. The wheelchair was fully developed on a basic level and could be a strong contender and worthy entrant in the market of wheelchairs.

Place, publisher, year, edition, pages
2014.
Series
MMKB 2014: 30 IDEB085
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-172122OAI: oai:DiVA.org:kth-172122DiVA: diva2:845814
Available from: 2015-10-13 Created: 2015-08-13 Last updated: 2015-10-13Bibliographically approved

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