| 摘要 |
<p>A vehicle having two motor-powered wheels (104) and surface engaging vacuum cups (120) that generate a surface-attachment force sufficient to hold the vehicle against a surface and to maintain a wheel traction sufficient to permit the wheels to move the vehicle on the surface. The vehicle, that can easily move and maneuver on the surface, may serve as a platform for a cleaning assembly for cleaning vertical glass surfaces of a building.</p> |
