| 摘要 |
A vacuum cleaner having an articulation mechanism which includes hemispherically shaped rearward wheels and spaced forward wheels, and a base member which pivotably couples the front and rear wheels so that the rearward wheels may be pivoted in a plane substantially vertical to the surface to be vacuumed such that only one of the rearward wheels in disposed on the surface when the rearward axis is pivoted from a horizontal. As the vacuum is pushed forward or pulled backward, the vacuum cleaner turns toward the side in which the rearward wheel is disposed on the surface to be vacuumed.
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