Handheld Vibrating Tools : Protect Your Employees

• Early symptoms: Repeated loss of feeling, numbness, in the fingertips and sensation of needles in the fingers, tingling, are early indicators. These sensations can come and go and are not proof of HAVS, but should be seen as early warnings.
• Later symptoms: Later, more severe symptoms are often felt like permanent numbness of fingers, causing difficulties in daily life when handling small objects or when buttoning for example.

When getting cold or wet, the fingers will often react by becoming white, then red while being painful. This is called the Raynaud's phenomenon, and is also common in hand arm vibration syndrome cases.

All frequent users of power tools that vibrate during usage could be affected. Vibration level and trigger time per work shift are the key factors that together give an indication if the person is at risk. According to a Japanese long-term study on forest workers using chainsaws (Nagoya, 1994), there is a strong relation between the number of years of exposure and the prevalence of HAVS. Among the workers over 50 years of age, 38% showed signs of this syndrome. US National Safety Council estimates that about 2 million U.S. workers are exposed to hand-arm vibration today, and as many as half could develop HAVS (read full article). HAVS is preventable, but once the damage is done, it is often permanent.

Many measures can be taken to reduce risk. Limiting time of vibration exposure being clearly the most important one, some other key points can be taken into account to protect yourself, your colleagues or your employees:

1. Try out different tools. Choose those that do not give numb fingers when using them for a short amount of time.
2. Always check that tools are serviced and well maintained.
3. Use the right tool for the right job. Trigger time is essential here, choose a stronger, more efficient tool that can do the job in a shorter amount of time rather than a lighter one.
4. Limit time per work shift with strong vibrations uptake. With applications giving strong vibrations, the operator can reach a potentially harming vibration dose within minutes. For reference, with an application that gives 20 m/s² of vibration to the operator’s hands, the exposure corresponding to the action value, (the value where the employer needs to take actions to limit vibrations), is reached after only 8 minutes.
5. Hold the tool loosely, do not squeeze the handle when not necessary.
6. Keep hands warm and try to avoid direct contact with freezing or very cold handles. Store the tool correctly so that your colleague will also be comfortable. If possible, do not leave tools outside overnight.
7. Take regular breaks. Avoid long sequences of high vibrations and try to do other jobs in between.