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   multi-purpose ergonomic backpack for high school students  
   
نویسنده arghami shirazeh ,moshayedi mojtaba ,ziad idin rahim
منبع journal of human, environment and health promotion - 2016 - دوره : 1 - شماره : 3 - صفحه:159 -165
چکیده    background: musculoskeletal disorders (msds) are among the most prevalent pains which could be ignited via material handling. backpack wearers are among those who may carry heavy loads. since msds mainly originate in school-aged children, students (as the largest group of backpack wearers) are considered more important. the purpose of this study is to design a backpack based on minimization of shearing force. methods: at first the relevant patents were investigated at national and international levels. then the appropriate ones were selected for optimization. the main selection criterion was based on reduction of pressure on the body. as an extra function we used a generator to produce electricity. the criterion for electricity generator selection was: 1) small dimension, 2) low weight, and 3) safe voltage. results: a suspending system was used to eliminate shearing forces. since a backpack wearing student is under the shearing force caused by walking, a spring system was used as a reducing device for shearing force. physical spring calculation revealed that springs with stiffness coefficient equal to 588 were appropriate. conclusion: in comparison with existing designs, suggested backpack design can reduce forces on upper limb during handling the backpack.
کلیدواژه backpack ,musculoskeletal disorders ,student ,suspending system
آدرس zanjan university of medical sciences, school of public health, department of occupational health engineering, ایران, zanjan university of medical sciences, school of public health, department of hse management, ایران, zanjan university of medical sciences, school of public health, department of occupational health engineering, ایران
پست الکترونیکی aidin_rahimziad@yahoo.com
 
 

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