Abstract: A vacuum type portable sander for exhausting dust emitted during the sanding, and housed within a lid-shaped shield which encloses the rotary disc. The shield has a body of hard material provided with an exhaust outlet, and at the bottom edge has a skirt member to contact the work surface during sanding. This skirt member is installed to move freely up and down along the outer periphery of the body. The main body has a resilient member in order to make the skirt member rebound onto the work surface during sanding. The skirt member is installed suspended from a hook on the upper part of the main body. The skirt member of this invention as configured above, can move up and down in response to irregular portions on the work surface and the interior of the shield therefore maintains a good seal to match variations on the work surface. The skirt member of this invention sustains damage due to wear from contact with work surfaces such as walls.

Abstract: A mobile floor cleaning and polishing machine comprising a wheel-supported chassis having thereon a turntable rotatable about a normally vertical axis. The turntable supports abrasive-ejecting mechanism including a generally rectangular nozzle from which granular, pelleted or pulverous abrasive may be discharged at high velocity, downwardly against the floor or other surface to be cleaned. By adjusting the angle of the rectangular nozzle with respect to the direction of advance of the machine, the width of the area treated in a single pass of the machine, may be controlled as desired. Spent abrasive is automatically recovered, cleaned and stored for re-use. Means are disclosed for oscillating the ejector means back and forth relatively to the chassis, in the direction of travel of the machine.

Abstract: A mobile floor cleaning and polishing apparatus is readily movable along the floor or horizontal surface to be treated to effect cleaning and polishing of a large metallic surface such as a ship deck. The apparatus comprises a mobile frame assembly having a centrifugal projector mounted thereon for impelling abrasive particles against the surface, a magnet drum for attracting and collecting the used abrasive particles accumulated on the surface, and a vacuum suction system for recovering heavy or large particles not recovered by means of the magnet drum. The vacuum suction system collects not only the heavy abrasive particles but also the removed paint, scale and other waste matter thereby preventing any contaminants from being introduced into the atmosphere.