Patent ID: 7789922

Claim:
A cyclonic dust collection chamber for use with a vacuum source wherein the chamber comprises: a base opposite an apex and a plurality of sidewalls extending therebetween, the apex and sidewalls having interior surfaces, wherein the interior surfaces are substantially smooth; an outflow passage; an inflow passage extending from an inflow aperture contained in the sidewalls proximate the apex and distal from the base, wherein the sidewalls of the chamber contain a recess aperture; the chamber further comprising a recessed cavity depending from the sidewalls at the recess aperture; an inflow nozzle positioned in the cavity, wherein the inflow nozzle is in communication with the inflow passage; the inflow nozzle further having a curved body with a top surface, wherein the curved body terminates in an aperture covered by a directional valve configured to open at an angle selected to discharge air into the chamber in a direction substantially tangential to the curvature of the sidewalls; a filter positioned over the outflow passage whereby air exiting the chamber via the outflow passage must pass through the filter; and wherein the vacuum source is in operative fluid engagement with the outflow passage whereby operation of the vacuum source will draw air into the chamber via the inflow passage and inflow nozzle, whereby air will be discharged through the directional valve at the selected angle, whereby the air will travel in a cyclonic path around the sidewalls of the chamber and across the top surface of the nozzle, and wherein the recessed cavity is further configured to keep the inflow nozzle substantially exterior to the cyclonic path of the airflow in the chamber.