Portable Surface Treating Apparatus

Author:  John C. Bergh
Source:  US Patent 4,052,820
Doc ID:  1976051
Year of Publication:  1976
Abstract:  
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 degrees to 80 degrees with the surface, a hopper for supplying abrasive particles to the wheel, a rebound corridor extending angularly upwardly preferably to a level above the hopper and into which the abrasive particles rebounding through the corridor to the hopper, means for intercepting abrasive particles which do not possess sufficient kinetic energy to rebound through the corridor to prevent return of said abrasive particles to the surface, and means for displacement of intercepted abrasive particles to the hopper.