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논문 기본 정보

자료유형
학술대회자료
저자정보
Buhyun Kwon (Korea Occupational Safety & Health Agency) Hyunwook Kim (Catholic University)
저널정보
대한인간공학회 대한인간공학회 학술대회논문집 대한인간공학회 2012 30주년 기념 춘계학술대회 제 14회 한·일 공동심포지엄
발행연도
2012.5
수록면
178 - 183 (6page)

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초록· 키워드

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Objective: The aims of this study were to ergonomically evaluate 4-wheeled hand carts and to provide the practical guidance associated with manual pushing and pulling of the carts to prevent work-related musculoskeletal disorders. Method: Total of 182 models of hand carts from 21 manufacturers were investigated and data were compared with previous studies and the Korea Human Dimensions Data (Size Korea). Eight(8) workplaces were visited to investigate psychophysical workloads, while objective workloads were measured in two(2) workplaces by means of a push-pull force gauge. The results were as follows. Results: (1) The elbow height(㎝) of Korean population (20-69 years) suitable for pushing and pulling of carts with effective use of force was 103.7 ± 4.4(cm) for men, and 95.8 ± 4.1l(cm) for women according to the Size Korea DB. The height(㎝) of the handle bar was 92.3 ± 7.2(cm). Therefore, considering the male worker"s elbow height, the height of the handle bar on the carts was designed too low for manual pushing and pulling of carts. (2) Carts with adjustable table heights were used to keep neutral work postures and to minimize back strains. It was found, however, that the weights of the cart itself(self-weight) and the load weights were heavier for the carts with adjustable table heights. Therefore, workers exert more force for pushing and pulling of these carts. (3) Initial force on pushing was measured using a push-pull digital force gauge and it was found that the required force was different by the total weight of carts and the angle of slope of the work floor. The initial force on pushing required on the slope exceeded the relevant criteria. In addition, the results of psychophysical survey on 15 workers showed that 7(46.7%) responded the pushing and pulling exerted as "hard(RPE 15)" from the Borg"s RPE scale. Conclusion: Considering the facts that the location of the handle bar and the weight of the carts were not ergonomically designed, it is desirable that the cart manufactures should design the handle height be adjustable at the design stage and should decrease the self- and load weights of the carts. And in case of selecting carts, to prevent musculoskeletal disorders, such factors as worker characteristics, handle height, weight of the cart, floor status, and load weights should be considered.

목차

ABSTRACT
Manual Material Handling(MMH), 4-wheeled hand carts. Musculoskeletal disorders, Pushing- Pullingtask1. Introduction
2. Method
3. Results
4. Conclusion
References

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