Wet sandblast gun

Claim 1

A wet sandblast gun comprising a gun housing including a barrel having a cylindrical opening extending therethrough and presenting a sand inlet end, at one end of said barrel, and presenting a sand outlet end, at the other end of said barrel, a first shoulder in said barrel and facing said sand inlet end, a second shoulder in said barrel and facing said sand outlet end, a first nozzle piece removably positioned in said barrel in fluidtight relationship with said first shoulder and having a bore therethrough extending coaxially with said cylindrical opening and being reduced in cross section at the end toward said sand outlet end and compared to the cross section at the end toward said inlet end, a perforated cylinder in said cylindrical opening intermediate said sand inlet and outlet ends thereof and being in axially abutting relation with said second shoulder and having perforations for receiving water at the exterior of said cylinder and passing it to the interior chamber of said cylinder, and a second nozzle piece removably positioned in said barrel in fluidtight relationship therewith and at said outlet end and having a bore therethrough extending and reduced as with said first nozzle piece, said first nozzle piece and said cylinder and said second nozzle piece all being coaxially aligned in said barrel and in fluid flow communication, a threaded connector on each said end of said barrel for abutment with the respective one of said nozzles and for releasably securing said nozzles in their fluidtight relationship with said barrel, said connector at said sand inlet end being a sand supply hose type of connector and being in fluid flow communication with said first nozzle piece for introducing sand into said first nozzle piece, and said barrel having a water passageway extending to said cylinder for introducing water to said cylinder interior chamber for mixing with the sand.