초록 ▼

A spray coating system is provided with features to improve resistance to wear and corrosion, while also improving ergonomics. The spray coating system may include a spray coating device having a body with a liquid inlet coupled to a liquid chamber, and a protective liner extending inside the liquid

A spray coating system is provided with features to improve resistance to wear and corrosion, while also improving ergonomics. The spray coating system may include a spray coating device having a body with a liquid inlet coupled to a liquid chamber, and a protective liner extending inside the liquid chamber, wherein the protective liner is fixedly coupled to the body without threads. The spray coating device also may include a liquid nozzle extending inside the protective liner, and a cap extending over the liquid nozzle.

대표청구항 ▼

1. A spray coating system, comprising: a spray coating device, comprising: a body comprising a liquid inlet coupled to a liquid chamber;a protective liner extending inside the liquid chamber, wherein theprotective liner is a one-piece annular body fixedly coupled to the body without threads, wherein

1. A spray coating system, comprising: a spray coating device, comprising: a body comprising a liquid inlet coupled to a liquid chamber;a protective liner extending inside the liquid chamber, wherein theprotective liner is a one-piece annular body fixedly coupled to the body without threads, wherein the one-piece annular body has a first and second couplings, the first coupling is disposed along an interior of the protective liner and a second coupling is disposed along an exterior of the protective liner;a liquid nozzle extending inside the protective liner, wherein the liquid nozzle comprises a first mating coupling that couples with the first coupling of the protective liner; anda cap extending over the liquid nozzle, wherein the cap comprises a second mating coupling that couples with the second coupling of the protective liner. 2. The spray coating system of claim 1, wherein the body is made of a first material and the protective liner is made of a second material, wherein the second material has a wear resistance, a hardness, a chemical resistance, or a combination thereof, that is greater than the first material. 3. The spray coating system of claim 1, wherein the body consists essentially of aluminum and the protective liner consists essentially of steel. 4. The spray coating system of claim 1, wherein the liquid chamber comprises an annular interior surface, and the one-piece annular body of the protective liner is press fit into the annular interior surface. 5. The spray coating system of claim 1, wherein the first coupling comprises first female threads, the first mating coupling comprises first male threads, the second coupling comprises second male threads, and the second mating coupling comprises second female threads. 6. The spray coating system of claim 5, comprising a valve packing insert extending inside the protective liner, wherein a needle valve extends through the valve packing insert and into the liquid nozzle. 7. The spray coating system of claim 5, comprising a protective fitting extending into the liquid inlet against the protective liner, wherein the body is made of a first material, the protective liner is made of a second material, the protective fitting is made of a third material, wherein the second and third materials are different than the first material, wherein the protective liner and the protective fitting define a liquid path to the liquid nozzle, and the liquid path is isolated from the first material of the body. 8. The spray coating system of claim 1, comprising a valve trigger coupled to the body at a pivot joint, wherein the valve trigger and the pivot joint are entirely on one side of an air passage extending through the body. 9. The spray coating system of claim 1, wherein a valve trigger coupled to the body at a pivot joint, wherein the valve trigger comprises an integral cam surface, and the integral cam surface is configured to gradually convert rotation of the valve trigger into linear displacement of a needle valve extending through the protective liner. 10. The spray coating system of claim 1, wherein the protective liner is a spray gun head insert configured to fixedly mount inside the liquid chamber of a spray gun head without threads. 11. The spray coating system of claim 1, comprising: a spray gun trigger coupled to the spray coating device, wherein the spray gun trigger has a one-piece structure, comprising: a trigger handle;a trigger lever extending from the trigger handle, wherein the trigger lever comprises a first valve biasing surface configured to displace a first valve member, and the first valve biasing surface comprises an integral cam surface configured to gradually convert rotation of the spray gun trigger into linear displacement of the first valve member; anda pivot joint disposed at an end portion of the trigger lever opposite from the trigger handle, wherein the pivot joint is disposed at an offset from the integral cam surface, and the pivot joint couples the spray gun trigger to a body of the spray coating device entirely on one side of an air passage. 12. The spray coating system of claim 11, wherein: the trigger lever comprises a second valve biasing surface configured to displace a second valve member;the integral cam surface is configured to control displacement timing of the first valve member relative to the second valve member; andthe first valve biasing surface is configured to bias the first valve member along a first axis of the first valve member at a first perpendicular offset from the pivot joint, the second valve biasing surface is configured to bias the second valve member along a second axis of the second valve member at a second perpendicular offset from the pivot joint, and second perpendicular offset is at least approximately 2.5 times greater than the first perpendicular offset. 13. The spray coating system of claim 11, wherein the first valve biasing surface has a peak displacement point along the integral cam surface at a first offset from the pivot joint, the trigger handle has a center point at a second offset from the pivot joint, and the second offset is at least approximately 2.5 times greater than the first offset. 14. The spray coating system of claim 11, wherein the first valve and the spray gun trigger are both positioned on the one side of the air passage, the body consists essentially of aluminum or an aluminum alloy, and the spray gun trigger consists essentially of steel.