چكيده به لاتين
Manual lifting is the most common and stressful manual load-carrying activity, which ranks first in terms of biomechanical stress on the body, especially the spine. In this study, the subject of manual carrying of household furniture on the stairs of residential buildings was introduced, and musculoskeletal injuries caused by carrying loads were also investigated, and the forces applied to body areas during manual carrying of loads on flat surfaces and stairs were analyzed using Snook tables, the NOISH equation, and methods such as KIM, UTAH, 3DSSPP, WISHA, ART, and MAC to measure the indicators, as well as the environments in which such tasks are performed, the objects and equipment available, and the types of interactions between people and objects were examined. In this study, the conventional double diamond thinking model was used, and the AEIOU methodology was used in data collection. In the study and investigation of different areas of manual load carrying, the vulnerable areas of the users' bodies were identified through the study of previous findings as well as field observation and interviews with the users studied. Further, by studying the aforementioned activity environments, it was proven that manual load carrying on sloping, uneven surfaces and stairs requires more muscle activity and increased wear and tear on the knee and ankle joints. Also, based on the findings obtained from the research, five different concepts were evaluated through the AHP method and after that, the selected design was developed and redesigned three times to pass safety and ergonomic tests, and the final design was presented in the form of a three-dimensional model and a one-eighth scale model. In the last stage of the research, the market strategies for the designed product and its branding were discussed. Market development strategies emphasize the importance of innovation, user experience, and strategic growth. SWOT analysis and the Boston Consulting Group (BCG) matrix provided insights into internal strengths and external opportunities. The purpose of this study is to provide a solution to reduce the direct need for the user's hands and muscles to carry loads on stairs.
