Guide to Manual Materials Handling
Manual Materials Handling MMH creates special problems for many different workers worldwide. Labourers engaged in jobs which require extensive lifting/lowering, carrying and pushing/pulling of heavy materials have suffered increasing rates of musculo-skeletal injury, especially to the back.; This guide is intended to include all activities involved in MMH lifting, pushing, pulling, carrying and holding. Recommendations are provided in the form of design data that can be used to design different MMH work activities.
The guide is divided into two parts. Part I outlines the scope of the problem, discusses the factors that influence a person's capacity to perform MMH activities and / or should be modified to reduce the risk of injuries, and reviews the various design approaches to solving the MMH problem. Part II provides specific design data in six distinct chapters. The seventh chapter of Part II of the guide describes various mechanical devices that are available to aid MMH activities.; The guide is aimed at all concerned with the health impact of MMH activities; occupational health and safety workers; senior human resource managers; ergonomists; workers' compensation lawyers; union representatives.
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Factors to be considered in designing manual materials handling tasks
Design approaches to solving manual materials handling problems
Ayoub and Mital back disorders back injuries back pain box to 35 Chaffin compressive force Container held design approaches design data divider untouched energy requirement Ergonomics fatigue females Figure force kg gb gb gb given in Table GOTO handling tasks held against ceiling held against wall human back industrial workers INPUT intermediate frequencies intervertebral disc isometric kcal kcal/min Kumar lifting bags lifting capacity lifting frequency lifting tasks Lifting/carrying low-back pain lower LPRINT lumbar spine males manual handling manual materials handling margin of safety maximum acceptable weight metabolic energy expenditure MMH activities MMH capacity MMH jobs MMH tasks NIOSH one-handed physical physiological design criterion Population percentile psychophysical pulling distance 144(135 recommended weight reduced rest allowances risk factors RPES sagittal plane shift duration shoulder height Snook spinal column spinal compression stress studies target at 40 Texas Tech University total energy ultimate compressive strength vertical reach heights weight of lift