Abstract:
The objectives of this intervention research project were to develop and evaluate engineering controls for the
reduction of the upper extremity injury risk in workers in the furniture manufacturing industry. The analysis of OSHA
Form 200 logs and surveys of furniture workers revealed that upholsterers, workers who use random orbital sanders
and workers who use spray guns are at higher levels of risk of illness than the rest of the working population. An on-site
ergonomic analysis of these three jobs was performed and the following risk factors were identified for each of these
three work groups: upholsterers--repetitive, high-force pinch grips; sanders--long-duration static grip forces; and
sprayers--awkward postures (ulnar wrist deviations and wrist flexion). Engineering interventions in the form of new or
modified handtools were then evaluated in the laboratory to assess their effectiveness in reducing exposure to these risk
factors. For sanding, an interface was created that secured the hand to the sander with the intention of reducing the
need for static grip forces during sanding. A new handtool was created for upholsterers that replaced the repetitive
pinch grips with a power grip. Finally, a commercially available spray gun with ergonomic features was evaluated. Each
of these modified tools/methods was compared with the standard methods typically used in industry. The results show
that most of the intended beneficial effects were realized. The random orbital sander interface reduced extensor muscle
activities by an average of 30%. The upholstery handtool reduced the intrinsic hand muscle activities by an average of
51%. The effects of the adapted spray gun were most prominent when working on horizontal surfaces and showed an
average reduction of 401 of wrist flexion and 141 of ulnar deviation as compared to the standard pistol grip spray gun in
this activity.