| 摘要 |
A high efficiency vacuum cleaner includes a debris transport passage and a plurality of debris inlets maintained in generally parallel spaced relationship with the floor. The total area of the debris inlets is less than or equal to the minimum cross-sectional area of the debris transport passage. Debris is removed from the floor in an air stream flowing into the debris inlets, the air stream generated by a vacuum source. The debris inlets may be mounted on one or more rotating heads, and the height of the debris inlets over the floor may be adjustable. The rotating heads may be driven by a motor and a belt drive. The belt drive system may be isolated from the airflow carrying the debris.
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