Surface treating apparatus

An apparatus for the treatment of substantially horizontal surfaces with particulate abrasive which is projected at high velocity against the surface being treated comprising a frame, an enclosure comprised of a delivery section attached to said frame, said enclosure having an opening adapted to confront the surface being treated, said delivery section having a projecting means therein for propelling abrasive through said opening to contact the surface being treated, a collection bin for spent abrasive attached to said frame, and a recovery section in movable relationship with said frame and said delivery section, said recovery section being in communication with the delivery section such that the projected abrasive from the propelling means passes through said opening to contact the surface being treated and rebounds into said recovery section;

• said recovery section directing spent abrasive from said opening to said collection bin;
• and recirculating means in communication with the collection bin to circulate abrasive from said collection bin to said projecting means.

In a mobile apparatus for the treatment of substantially horizontal surfaces with particulate abrasive which is projected at high velocity against the surface comprising an enclosure having an opening adapted to confront the surface being treated, a projecting means within said enclosure for propelling abrasive through said opening to contact the surface, a collection bin for spent abrasive behind the opening, an abrasive recovering means for directing spent abrasive to the collection bin, an elevator adapted to circulate spent abrasive from the collection bin to said projecting means, and a blower adapted to draw air through the enclosure, the improvement comprising an air duct in communication with said collection bin and the blower such that air is drawn from said enclosure across the collection bin to sweep waste material from spent abrasive, said air duct defining a plenum between the collection bin and the blower, said plenum having a sufficiently large cross-sectional area to facilitate separation of entrained abrasive from the air stream.

A mobile apparatus for the treatment of substantially horizontal surfaces with particulate abrasive which is projected at high velocity against the surface being treated comprising an enclosure having an opening therein adapted to confront the surface being treated, a sealing means surrounding said opening and adapted to contact the surface being treated to establish a sealing contact between the enclosure and said surface, a projecting means for propelling abrasive through the opening in the enclosure, a collection bin in communication with the enclosure to receive rebounding spent abrasive therefrom, an attenuating means in said enclosure to reduce the kinetic energy of the rebounding spent abrasive prior to passing to the collection bin, a rotary broom behind the sealing means and the collection bin adapted to contact the surface and direct spent abrasive passing under the sealing means to the collection bin upon movement of the apparatus, and recirculation means to circulate abrasive in said collection bin to said projecting means.

An apparatus suitable for the treatment of surfaces with particulate abrasive which is projected at high velocity against the surface being treated comprising an enclosure having an opening adapted to confront said surface, said enclosure being comprised of a delivery section having a projecting means therein for propelling abrasive into said opening to contact the surface, and a blasting section being in movable relationship with respect to said delivery section, said blasting section having a chute in communication with the delivery section such that projected abrasive from the propelling means passes into the blasting section and said opening, rebounds from said surface and passes through said chute to a collection bin for return to said projecting means.