| 摘要 |
The invention relates to a working device (2) which is attached to a surface (1) by a pull of negative pressure, can be displaced on said surface, in particular for carrying out work and is connected to a base station via a supply line (4). With said device, there is a risk that if the pull diminishes, the working device (2) may fall. To prevent this, the invention is characterised in that the working device (2) is connected to the base statio n (3) by means of a safety line (5) that can be used to prevent the working device (2) from falling. The working device (2) can therefore also be used i n places, from which it could fall from a great height if said device malfunctioned, such as for example, on the exterior of buildings.
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