| 摘要 |
<p>A portable apparatus for treatment of surfaces, preferably horizontal, comprising a centrifugal wheel for projecting abrasive particles onto the surface at an angle within the range of 30 DEG to 80 DEG with the surface, a feed hopper for supplying abrasive particles to the wheel, a rebound corridor of decreasing cross-section extending angularly upwardly and into which the abrasive particles rebound upon striking the surface and means for returning abrasive particles rebounding through the corridor to the hopper.</p> |
