| 摘要 |
A rotary agitator for a cleaning apparatus includes a body having an axis of rotation and a zero degree pitch plane perpendicular to the axis of rotation. The rotary agitator also includes an agitation element carried on the body. The agitation element includes a first portion provided at a positive pitch angle relative to the zero degree pitch plane and a second portion provided at a negative pitch angle relative to the zero degree pitch plane.
|
