| 摘要 |
Brush for cleaning walls having concave surface, comprising a central core (1), prevalently longitudinally developed, which is driven by corresponding motor means (6) moving it about the respective longitudinal axis (x-x) at a preset angular speed, said core (1) being associated to a motion device (3) by means of which it is moved in respect to the surface (SV) to be cleaned while the same core rotates about the said longitudinal axis (x-x), said core (1) being provided with a plurality of radial bristles (4) the distal ends of which define, in their whole, a rotational solid having a substantially convex barrel-shaped surface (SC), that is, a surface with a diameter decreasing form the middle of the core towards the two ends of the same.
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