Handle types on the commonly used grass trimmer reaches the exposure limit value for daily vibration exposure.

The portable petrol driven grass trimmer is identified as a type of machine whose operator can be subjected to large magnitude of hand-arm vibration. The vibration total level on the handle of grass trimmer of 11.30 m/s2 was measured, and it has reached the exposure limit value of 5.0 m/s2 for daily vibration exposure A(8). Operators were not fully aware of the level of vibration. Different prototype handles were tested; one that is made of heavier material results in the lowest hand-arm vibration. The new handle has significantly reduced the vibration total value by 76% compare with the existing commercial handle. Large numbers of workers are employed to perform grass trimming job in many developing countries.

Source: The design and development of suspended handles for reducing hand-arm vibration in petrol driven grass trimmer. Ko Y.H., Ean O.L. and Ripin Z.M.; International Journal of Industrial Ergonomics; Volume 41, Issue 5, September 2011, Pages 459-470.

www.sciencedirect.com/science/article/pii/S0169814111000606

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