| 主权项 |
1. A hands-free portable device for cleaning a substantially horizontal surface, the device comprising:
one or more motors substantially enclosed by a housing, wherein said housing does not engage said surface when said device is positioned upon said surface and not held by a user, two or more scrub brushes, each rotationally coupled to one or more of said motors, wherein at least one of said scrub brushes is disposed so that a side of said at least one scrub brush extends in a horizontal direction beyond said housing, wherein the distribution of mass of said device is substantially uneven, and wherein motion from said motors is rotationally transferred to said scrub brushes, said transferred motion and said substantially uneven distribution of mass of said device causing said device to be self-propelled on said surface, without the user hand-guiding the device. |
