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Chapter 13
Manual Material Handling
Copyright (c) 2012 P. Neumann, BSc, MSc, LicEng, PhD, LEL, Eur.Erg
– This teaching material is not for resale or commercial use.
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Manual Materials Handling
MMH
•
27% of industrial injuries
•
60% of costs in industry
•
93 x 10
6
days lost/year
•
Both acute and chronic
Peak and Cumulative loading
Konz & Johnson 2004
One time event
Ongoing / prolonged
Risk
•
Can be managed by better job design
1.
Biomechanical Risk
–
Calculate the load
2.
Physiological Risk
–
Compare to capability
3.
Psychological Risk
Konz & Johnson 2004
Issues
What types of factors will influence risk in
MMH tasks?
1.
2.
3.
Konz & Johnson 2004
Issues
1.
Task
–
Adjust permanently
•
Location
(esp reach distance & height)
•
Mass
•
Grip-ability & stability
•
Frequency
2.
Technique
- Can train but we all ‘slip up’
3.
Individual - Selection or human rights
violation
Konz & Johnson 2004
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Pushing and Pulling
•
Force limits; factors:
– Handles
– 1-2 hands
– Body Posture and Grip Location
Direction
push/pull etc
– Direction – push/pull etc.
Konz & Johnson 2004
Pushing and Pulling
•
Two hands better than one
•
Force decreases with repetition
•
Initial strength increases then sustained
•
Pushing stronger than pulling
•
Push at waist level pull at thigh level

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- Winter '12
- Dr.PatrickNeumann
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