This case study investigated why scissor lifts installed by a meat processing plant for a conveyor-to-pallet manual materials handling (MMH) task were not used by employees, despite apparent workplace improvement.
A lumbar motion monitor (LMM) was used to assess tri-axial trunk motions and the velocities and accelerations associated with the job.
Three palletizing conditions were evaluated : at the floor, at a scissor lift, and at a modified scissor lift.
Front and back box positions at three levels of the floor palletizing task and three box positions at the scissor lift were assessed.
Analysis combined observations, probability of « high risk » for low back disorder (LBD), and the National Institute for Occupational Safety and Health 1991 Work Practices Guide lifting index.
Results showed the original scissor lift workplace had a higher probability of LBD risk than floor palletizing due to subtle barriers.
These included a raised edge on the conveyor and a railing around the scissor lift where boxes were placed, which increased maximum sagittal flexion and maximum lateral velocity during lifting.
Results showed that measurement of dynamic factors provided greater sensitivity to the subtleties of workstation barriers and illustrated the effect of small barriers on task performance and associated risk.
Further studies of trunk motions with alternative mechanical aids and different starting heights in MMH are indicated.
Mots-clés Pascal : Manutention, Palettisation, Ergonomie, Lombalgie, Prévention, Industrie alimentaire, Homme, Efficacité, Evaluation performance, Elévateur fourche, Médecine travail, Poste travail, Douleur, Système ostéoarticulaire pathologie, Rachis pathologie, Rachialgie
Mots-clés Pascal anglais : Handling, Palletization, Ergonomics, Low back pain, Prevention, Food industry, Human, Efficiency, Performance evaluation, Fork lift truck, Occupational medicine, Workplace layout, Pain, Diseases of the osteoarticular system, Spine disease, Rachialgia
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0007421
Code Inist : 002B29C01. Création : 01/03/1996.