Always use technical aids if there is a risk of physical strain which is harmful to health. Technical aids include machinery, tools, systems and stationary or mobile transport equipment and lifting gear.
Find out more about choosing technical aids at www.bygergo.dk. There are examples here of suitable technical aids for different purposes and different fields.
The strain on the user must not be too great when using handheld machines. This can be rectified by hanging up the machine. In general, the weight and centre of gravity must be adapted according to the usage method and the time over which the machine is being used.
The correct placement and design of handles also helps to reduce strain on the user.
The grip surface must be large enough to achieve even distribution of pressure. Your hands work best when bent back slightly. It is an advantage if handles on handheld machines damp vibration and are heat-insulated.
A good seat provides full support for the lumbar region and back without at fixing the seating position. The following are also recommended for the driver’s seat in cranes, fork lift truck and other contract machinery:
- The seat must support approx. 2/3 of the length of the thighs and have a rounded front edge. It must be upholstered and covered with a pleasant material which permits ventilation. It must be easy to set the height and tilt of the seat without tools. It should also be possible to move the seat backwards and forwards.
- It must be possible to adjust the springs, support and vibration damping in the seat according to the weight of the driver.
- The backrest must provide the necessary support for the lumbar region and back, must not impede arm movements and must provide the necessary lateral support. Set the backrest so that the angle of the hips is 95-120° at a slight backward tilt.
- It should be possible to set the tilt of the seat and backrest independently of one another.
- It should be possible to adapt the tilt to the job being done (e.g. in cranes, given the direction of vision, it may be necessary to allow the seat and backrest to tilt both backwards and forwards, depending on whether work is taking place on the ground or high up).