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A mask (10) for use with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal's airways. The mask (10) includes a mask shell (12) which is, in use, in fluid communication with a gas supply conduit and a gas washout vent assembly (20). The gas washout vent

A mask (10) for use with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal's airways. The mask (10) includes a mask shell (12) which is, in use, in fluid communication with a gas supply conduit and a gas washout vent assembly (20). The gas washout vent assembly (20) includes at least one gas washout orifice (22) extending from a first side of the vent assembly (20) positioned, in use, adjacent the human or animal's face and a second side positioned, in use, adjacent the atmosphere. The cross-sectional area of the orifice (22) at the first side is larger than the cross-sectional area of the orifice (22) at the second side.

대표청구항 ▼

A mask (10) for use with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal's airways. The mask (10) includes a mask shell (12) which is, in use, in fluid communication with a gas supply conduit and a gas washout vent assembly (20). The gas washout vent

A mask (10) for use with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal's airways. The mask (10) includes a mask shell (12) which is, in use, in fluid communication with a gas supply conduit and a gas washout vent assembly (20). The gas washout vent assembly (20) includes at least one gas washout orifice (22) extending from a first side of the vent assembly (20) positioned, in use, adjacent the human or animal's face and a second side positioned, in use, adjacent the atmosphere. The cross-sectional area of the orifice (22) at the first side is larger than the cross-sectional area of the orifice (22) at the second side. nts of the heater support members of the support frame. 9. The apparatus of claim 1 additionally comprising a pump in fluid communication with the heating conduit for producing the flow of fluid through the heating conduit for heating the flowing fluid by the combustion chamber. 10. The apparatus of claim 1 wherein the burner apparatus produces a flame for generating heat. 11. The apparatus of claim 1 wherein the heating conduit has a substantially uniform size between the inlet and the outlet thereof. 12. The apparatus of claim 1 wherein the combustion chamber has a chamber perimeter wall, and wherein the heating conduit has a preheating portion adjacent to the inlet, the preheating portion of the heating conduit extending about the outer surface of the chamber perimeter wall of the combustion chamber for absorbing heat from the chamber perimeter wall. 13. The apparatus of claim 12 wherein the preheating portion of the heating conduit comprises a substantially helical coil extending around the chamber perimeter wall, the helical coil comprising a plurality of loops. 14. The apparatus of claim 13 wherein the plurality of loops each have substantially equal diameters. 15. The apparatus of claim 1 wherein the heater assembly additionally comprises a heater housing extending about the combustion chamber, the heater housing including an outer peripheral wall. 16. The apparatus of claim 15 wherein the heater housing includes an inner peripheral wall, the inner peripheral wall being positioned in an interior defined by the outer peripheral wall. 17. The apparatus of claim 16 wherein the outer peripheral wall has a substantially cylindrical shape with an upper opening and a lower opening, the inner peripheral wall having a substantially cylindrical shape, the inner peripheral wall being oriented substantially coaxially with respect to the outer peripheral wall. 18. The apparatus of claim 17 wherein the chamber perimeter wall of the combustion chamber is oriented substantially coaxially with respect to the outer peripheral wall of the heater housing such that a perimeter chamber is formed between the chamber perimeter wall of the combustion chamber and the peripheral wall of the heater housing. 19. The apparatus of claim 1 wherein the combustion chamber includes a chamber perimeter wall comprising a heat reflective material. 20. The apparatus of claim 12 wherein the heater assembly additionally comprises a heater housing extending about the combustion chamber, the heater housing including an outer peripheral wall and an inner peripheral wall, the inner peripheral wall being positioned in an interior defined by the outer peripheral wall, and wherein the preheating portion of the heating conduit is spaced from an inner surface of the outer peripheral wall of the heater housing to produce an air space between the heating conduit and the outer peripheral wall. 21. The apparatus of claim 20 wherein the preheating portion of the heating conduit contacts an outer surface of the inner peripheral wall of the heater housing. 22. The apparatus of claim 1 wherein the heating conduit is drainable by gravity when the heater assembly is in the operational position. 23. The apparatus of claim 19 wherein the heat reflective material of the chamber perimeter wall minimizes heat movement through the chamber perimeter wall to an outer surface of the chamber perimeter wall. 24. A fluid heating apparatus comprising: a support frame; a heater assembly mounted on the support frame, the heater assembly comprising: a combustion chamber having a lower end and an upper end; a burner apparatus for burning fuel in the combustion chamber, the burner apparatus being mounted at the lower end of the combustion chamber; and wherein the heater assembly is pivotally mounted on the support frame for permitting pivoting of the heater assembly in a substantially vertical plane with respect to the support frame such that the heater assembly is pivotable between an o perational position and a maintenance position; and wherein the heater assembly comprises a heater housing and the support frame includes at least one heater support member, wherein at least one pivot shaft pivotally mounts the heater housing to the heater support member, the locking means selectively and positively locking the heater assembly in at least two positions, the locking means comprising a first locking aperture located on the heater housing at a distance from the pivot shaft, a second locking aperture being located on the heater support member and being alignable with the first locking aperture when the heater housing is in the operational position, and a third locking aperture being located on the heater support member and being alignable with the first locking aperture when the heater housing is in the maintenance position. 25. The apparatus of claim 24 wherein the second locking aperture is spaced in a substantially vertical direction from the pivot shaft, and the third locking aperture is spaced in a substantially horizontal direction from the pivot shaft. 26. A fluid heating apparatus comprising: a support frame; a heater assembly mounted on the support frame, the heater assembly comprising: a combustion chamber having a lower end and an upper end; a burner apparatus for burning fuel in the combustion chamber, the burner apparatus being mounted at the lower end of the combustion chamber; and a heating conduit for carrying a continuous flow of fluid through the heater assembly for heating the fluid by the combustion chamber, the heating conduit having an inlet and an outlet; and a pump in fluid communication with the heating conduit for producing the continuous flow of fluid through the heating conduit for heating the continuously flowing fluid by the combustion chamber; wherein the heater assembly is pivotally mounted on the support frame for permitting pivoting of the assembly in a substantially vertical plane with respect to the support frame such that the heater assembly is pivotable between an operational position and a maintenance position. ive to the grill, the telescoping sections extendable when the umbrella is open to maximize the distance between the umbrella and the grill and retractable to close the umbrella; breakaway means for preventing the umbrella from causing a grill to which the umbrella assembly is attached from falling over when a gust of wind strikes the umbrella exerting a force on the umbrella exceeding a predetermined level; and means for removably attaching a proximal end of the arm to the grill. 8. The umbrella assembly of claim 1, further comprising a light attached to a bottom end of the central shaft of the umbrella for illuminating an area beneath the umbrella.