Abstract: A filtering apparatus for separating solid particles from gases includes an inlet end-wall member, an outlet end-wall member, and a filter unit disposed therebetween. A filter element is disposed within the filter unit in surrounding relationship with a power unit for moving gas through the filter element. The filter unit includes a filter enclosure extending between the end-wall members and releasably connected therewith. The filter enclosure has open ends and sides defined by an inner wall and an outer wall, the inner and outer walls together defining a filter compartment for the filter element. The inner wall also defines an interior compartment for the power means and the outer wall forms a casing detachably connected to the end wall members. The filter compartment communicates through one of its open ends with the inlet end wall member and communicates through the other of its open ends and through the interior compartment with the outlet end wall member.

Abstract: A particle suction system wherein a machine tool is connected to a quick coupling device which comprises a pressurized air control valve for regulating the removal of dust particles from the work area. The pressurized air control valve is arranged to follow the quick coupling device when it is disconnected from the machine tool and interrupts the air flow.

Abstract: An abrasive disc which may be attached to a holder having a suction device associated therewith. The disc includes a body of soft, resilient material and abrasive layers on both sides. Apertures, openings, and orifices in the abrasive layers and in the edge of the body allow air and particles to be drawn into internal passages in the body of the disc and flow out of the body to the suction device in the holder. The apertures also facilitate attachment of the abrasive disc to the holder.