A spray gun includes a main body and a spray head. The spray head has an air cap, a hollow nozzle member having a nozzle tip for dispensing a liquid to be sprayed. The hollow nozzle member has a radially extending weir which together with a surface of the main body defines an air distribution chambe
A spray gun includes a main body and a spray head. The spray head has an air cap, a hollow nozzle member having a nozzle tip for dispensing a liquid to be sprayed. The hollow nozzle member has a radially extending weir which together with a surface of the main body defines an air distribution chamber for receiving and distributing compressed air from a supply inlet. An annular sealing member is sealingly disposed between the radially extending weir and the surface of the main body, dividing the chamber, so that air passing into the chamber through an opening to one side of the annular wall is directed to a central aperture of the air cap and air passing into the chamber through an opening to the other side of the annular wall is directed to lateral apertures of the air cap.
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1. A spray gun, comprising a main body, a spray head, an inlet for a substance to be sprayed, and another inlet for a compressed gas; the spray head comprising a hollow nozzle member having a nozzle tip for dispensing the substance, said nozzle member being secured to the main body; wherein
1. A spray gun, comprising a main body, a spray head, an inlet for a substance to be sprayed, and another inlet for a compressed gas; the spray head comprising a hollow nozzle member having a nozzle tip for dispensing the substance, said nozzle member being secured to the main body; wherein the hollow nozzle member together with a surface of the main body defines a gas distribution chamber for receiving and distributing the compressed gas; said spray gun further comprises an annular sealing member sealingly disposed between the nozzle member and said surface of the main body so as to divide the gas distribution chamber, whereby a first portion of the compressed gas passing into the chamber through a first opening to one side of the annular sealing member and a second portion of the compressed gas passing into the chamber through a second opening to the other side of the annular sealing member; and the annular sealing member is arranged eccentrically with regard to a main axis of the spray head. 2. A spray gun according to claim 1, wherein the annular sealing member is circular.3. A spray gun according to claim 1, wherein the annular sealing member is set into a recess in said surface of the main body.4. A spray gun according to claim 3, wherein the recess has been machined into said surface of the main body.5. The spray gun according to claim 1, wherein said spray head further comprises: a central aperture through which the first portion of said gas is directed to atomize the substance dispensed through the nozzle tip to form a spray; and one or more lateral apertures through which the second portion of said gas is directed for shaping the spray to a desired pattern. 6. A spray gun according to claim 5, wherein the first portion of said gas is directed to the central aperture of said spray head via a path extending through the nozzle member.7. A spray gun according to claim 5, wherein the second portion of said gas is directed to the lateral apertures of said spray head via a path extending around an edge of the nozzle member.8. A spray gun according to claim 5, wherein the nozzle member further comprises a rearwardly extending tubular formation which, together with a forward surface of the nozzle member, at least partially defines an annular chamber surrounding the hollow nozzle member for receiving the first portion of said gas.9. A spray gun according to claim 8, wherein said central aperture is defined by an opening in a front wall of the annular chamber.10. A spray gun according to claim 5, wherein the nozzle tip protrudes into the central aperture so that an annular flow path is defined around the nozzle tip for atomizinig said substance with the first portion of said gas.11. A spray gun according to claim 5, wherein the spray head further comprises a pair of horns, which horns contain at least some of the lateral apertures.12. A spray gun according to claim 1, wherein the sealing member is formed from a plastics material.13. A spray gun according to claim 12, wherein the plastics material is selected from the group consisting of polyacetal, polyamide, polypropylene and polyethylene.14. A spray gun according to claim 1, wherein said spray gun is suitable for spraying paint or other protective or decorative coatings.15. A spray gun, comprising a main body, a spray head, an inlet for a liquid to be sprayed, and an inlet for a supply of compressed air; the spray head comprising an air cap, a hollow nozzle member having a nozzle tip for dispensing the liqiuid, and means for securing the air cap and nozzle member to the main body; the air cap having a central aperture through which atomizing air is directed to atomize the liqiuid dispensed through the nozzle tip to form a spray, and one or more lateral apertures through which fan air is directed for shaping the spray to a desired pattern; the hollow nozzle member having a radially extending weir which together with a surface of the main body defines a n air distribution chamber for receiving and distributing the compressed air from the supply inlet; said spray gun further comprising an annular sealing member having an annular wall and being sealingly disposed between the radially extending weir and said surface of the main body so as to divide the air distribution chamber, whereby air passing into the chamber through an opening to one side of the annular wall is directed to the central aperture of the air cap and air passing into the chamber through an opening to the other side of the annular wall is directed to the lateral apertures of the air cap; wherein the annular wall is arranged eccentrically with regard to a main axis of the spray head. 16. A spray head for use in a spray gun, said spray gun comprising, besides said spray head, a main body, an inlet for a substance to be sprayed, and another inlet for a compressed gas, said spray head comprising: a hollow nozzle member having a nozzle tip for dispensing the substance, said nozzle member adapted to be secured to the main body, wherein the hollow nozzle member is adapted to define, together with a surface of the main body, a gas distribution chamber for receiving and distributing the compressed gas; an air cap having a central aperture through which a first portion of said gas is directed to atomize the substance dispensed through the nozzle tip to form a spray, and one or more lateral apertures through which a second portion of said gas is directed for shaping the spray to a desired pattern; and an annular sealing member adapted to be sealingly disposed between the nozzle member and said surface of the main body so as to divide the gas distribution chamber, whereby the first portion of the compressed gas passing into the chamber through a first opening to one side of the annular sealing member and the second portion of the compressed gas passing into the chamber through a second opening to the other side of the annular sealing member; wherein the annular sealing member is arranged eccentrically with regard to a main axis of the spray head.
Robinson Frank A. (Toledo OH) Orr Albert S. (Indianapolis IN) Burns Marvin D. (Millbury OH) Fritz Alan H. (Toledo OH), Baffle for HVLP paint spray gun.
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