Respirator facepieces
View Patent ↗The present invention provides an air-purifying respirator facepiece with a removable, one-piece filter element connector. It also has a removable component housing in the lens as well as a nosecup without inhalation valves that prevents fogging of the portion of the lens used for viewing.
1. An air-purifying, full-face respirator facepiece comprising:
a lens through which a user views a surrounding environment; and
a nose cup contained within the respirator facepiece, the nose cup including a seal to form a sealing contact around a nose and mouth of a user and at least one inspiration passage that is positioned on a forward section of the nose cup and passes through the nose cup to the interior of the respirator facepiece without an intervening check valve so that the inspiration passage forms a flow path between the lens and an interior at the nose cup without an intervening check valve, the inspiration passage being positioned to circulate air over a viewing area of the lens.
2. The respirator facepiece of claim 1 further comprising at least one inspiration port formed in the lens and a baffle to direct the flow of air entering the respirator facepiece through the inspiration port.
3. The respirator facepiece of claim 2 wherein the baffle comprises a flange with at least one opening positioned adjacent an inner surface of the lens to direct the flow of air over the viewing area of the lens.
4. The respirator facepiece of claim 2 wherein the inspiration passage is positioned below the viewing area of the lens to direct any expired air exiting the inspiration passage below the viewing area of the lens.
5. The respirator facepiece of claim 4 wherein the baffle contacts the inner surface of the lens above the inspiration port of the respirator facepiece and below the inspiration passage of the nose cup.
6. The respirator facepiece of claim 2 wherein the inspiration passage is angled to direct any air expired therethrough in a downward direction.
7. The respirator facepiece of claim 2 wherein the inspiration passage is below the level of a user's eyes when the respirator facepiece is worn.
8. The respirator facepiece of claim 2 comprising two inspiration ports, each without an intervening check valve, and two baffles, one of each located on a right half of the nose cup and one of each located on a left half of the nose cup.
9. The respirator facepiece of claim 8 wherein each baffle contacts an inner surface of the lens below one of the inspiration passages of the nose cup.