Patent ID: 8636562

Claim:
A surface treating apparatus comprising: a. a back-up apparatus connectable to a driving apparatus and rotatable about a central axis, the back-up apparatus comprising a back-up plate having an abrasive mounting face and an opposed rear face, a plate mounting aperture formed in the back-up plate and aligned with the central axis and a plurality of plate suction apertures extending through the back-up plate, the plurality of plate suction apertures being spaced apart from each other around the periphery of the back-up plate; b. an abrasive fibre disc, the fibre disc having an abrasive surface coated with abrasive material and an opposed mounting surface adjacent the abrasive mounting face of the back-up plate, the fibre disc comprising a central mounting aperture registered with the plate mounting aperture, and a plurality of disc suction apertures spaced apart from each other about the periphery of the fibre disc and registered with corresponding ones of the plurality of plate suction apertures; c. a mounting fastener for attaching the fibre disc to the surface treating apparatus, the mounting fastener configured to extend through the plate mounting aperture and the central mounting aperture and to engage at least one of the back-up apparatus and the driving apparatus; d. a suction apparatus comprising a suction housing, the suction housing comprising a suction housing inlet opposite the rear face of back-up plate and surrounded by a suction housing sidewall, the suction housing sidewall being radially outboard of the plurality of disc suction apertures and the suction housing inlet covering substantially all of the rear face of the back-up plate and being in fluid communication with the plurality of plate suction apertures for extracting sanding waste through the fiber disc and back-up apparatus.