FR2731922A1 - AIR ATOMIZER FOR AIR-FREE SPRAY GUNS OF TEXTURIZATION SUBSTANCES - Google Patents

Abstract

The air atomizer for use with an airless spray gun includes a housing containing a reversible airless tip (20) located on the front end of the gun. An air atomizer housing allows the texturizing substance to be atomized to produce a wide range of texturizing patterns. The reversible tip with the air atomizer allow the user to unblock a blocked nozzle (20c), by rotating this tip, without disassembling the atomizer. The metered amount of air mixes with the substance to change the style of the pattern. Application to the mounting of an air atomizer on an airless spray gun.

Description

Texturizing substances have been increasingly used in

  recent years and are likely to imitate stone as well as many other materials. These substances are often considered to be difficult to spray and have traditionally been deposited by air spray guns. These substances are not usually sprayable with conventional airless spray equipment and often have

  need for rotor and stator pumps.

  The subject of the invention is a spray gun for air-jet texturizing substances which can be

  suitable for conventional airless spray guns.

  Another object of the present invention is to provide an atomizer for producing a wide range of texturizing patterns ranging from dotted patterns

very fine to splash.

  Yet another object of the present invention is to provide a texturizing atomizer which can be

  easily cleaned by the user.

  Reversible spray tips such as those described in U.S. Patent No. 4,165,836 are well known for uncorking nozzles

airless spray.

  The air atomizer comprises two parts, an air circulation part and a circulation part of the substance or a fluid. The circulation portion of the substance is controlled by a reversible tip for controlling the flow, the uncoupling and the size of the fan pattern. The air circulation portion is controlled by a needle valve for metering the correct amount of air for the desired style of the pattern, as well as a ball valve for turning on and off the air.

air circulation.

  The substance and air are mixed internally and then sprayed by a cap which controls the size of the pattern. This device is designed to be attached to conventional airless spray guns and has the advantage of allowing an airless system to perform air spray texturizing applications. The built-in reversible tip system makes it easy to unclog the flow control tip, regardless of the size of the fan pattern. The air metering valve allows the user to fine tune the air volume and viscosity of the substance to achieve the desired pattern. Other features and advantages of the invention will be described in more detail with reference to the accompanying drawings, in which: FIG. 1 is a plan view of the device of the invention; FIG. 2 is a sectional view along the line; FIG. 3 is another plan view of the system of the invention, FIG. 4 is a sectional view along the line 4-4 of FIG. 3, and FIG. exploded perspective of the

  spray gun according to the invention.

  The actual atomizer of the present invention is shown generally in Figures 1-4 and exploded view in Figure 5 in its application to a conventional airless spray gun. The atomizer 10 is adapted to be attached to the anterior end of a conventional airless spray gun 12. This conventional gun includes a threaded anterior end 14 in which a needle valve is located to turn on and off the pressure. without air (the pressure of

  working up to 210 kg / cm2).

  The atomizer 10 comprises a nut 16 which is captive on a body 18. A relatively conventional reversible tip assembly 20 mounted on the body 18 includes a handle 20a and a cylinder 20b provided with an airless nozzle 20c. These reversible airless spray nozzle assemblies are very common and described by

  for example in U.S. Patent No. 4,165,836.

  The body 18 through which the substance passes is mounted by means of an elastic ring 22 in a body 24 in which there is a passage 24a for air. A substance nozzle 26 is housed with a slight interference fit (an elastomeric O-ring produces the fit) in the body 24 and receives the material passing through the airless spray nozzle 20c and which is then fed into a passageway. fluid 28 made in the substance nozzle 26. An air inlet cap 30 is retained on the nozzle 26 by means of a retaining ring 32. Thus, the air circulates in the passage 24a of air and in an annular reservoir 34 when it flows through a frustoconical passage 36 situated around the front end 26a of the nozzle 26

atomization of the substance.

  As shown particularly in FIG. 5, a pistol grip holder 36 houses an air valve holder 38 formed of a set 40 consisting of a ball valve 42 and a needle valve 44. The ball valve 42 is used to control the arrival and shut off the airflow, while the needle valve 44 is used to finely regulate the airflow. An outlet elbow 46 from the needle valve 44 uses a conduit 48 to connect it to a fitting

  intake 50 which communicates with the passage 24a.

  The reversible tip allows the user to unclog a sealed tip without disassembling the air atomizer. The needle valve is used to dispense the correct amount of air for the desired style of the pattern, while the ball valve is used to turn on and off the airflow. The substance and the air mix internally and exit through the opening 30a of the cap 30

air inlet.

  More generally, it is recalled that the present invention relates to a spray gun for the deposition of texturizing substances and comprising at the front end a valve around which is disposed a tapped fitting housing a nozzle airless spray, characterized in that it comprises a housing of a body comprising an axial passage of the substance and having first and second ends, the first end being screwed into said coupling, a reversible nozzle housing rotatably mounted in said housing of the body between the ends thereof, said nozzle housing including an airless spray nozzle and being rotatable to unclog said nozzle while providing flow control, means for supplying compressed air at the second end of the housing of said body and an air flow cap mounted on said second end so as to co operating with said air supply means for atomizing the substance which has passed through said nozzle of

  spraying and said passage of substance.

  According to preferred arrangements, possibly combined, the gun further comprises: - a substance nozzle mounted in said housing of the body and an annular air supply passage is located between said air flow cap and said substance nozzle; an axial passage of the substance situated in said nozzle, said passage of the nozzle communicating with the passage of the material through the body; an annular conical passage of atomizing air located between said air circulation cap and said substance nozzle, said atomizing air passage communicating with said air supply passage; a means for controlling the supply of compressed air. It is understood that various modifications can be made to the atomizer without departing from the scope

of the invention.

  1. Spray gun for depositing texturizing substances and comprising at the front end a valve around which is disposed a threaded connection (16) for accommodating an airless spray tip, characterized in that comprises a housing of a body (18) comprising an axial passage of the substance (28) and having first and second ends, the first end being screwed into said fitting (16), a reversible nozzle housing (20) mounted rotating in said housing of the body between the ends thereof, said nozzle housing comprising an airless spray nozzle (20c) and being rotatable to unclog said nozzle while providing control of the flow, means (24a) for supplying compressed air to the second end of the housing of said body (18) and an air circulating cap (30) mounted on said second end so as to cooperate with said means for supplying air to atomize the substance which has passed through said spray nozzle (20c) and said

passage of substance (28).

  Texturizing substance spray gun according to claim 1, characterized in that it further comprises a substance nozzle (26) mounted in said housing of the body and an annular air supply passage is located between said cap of

  air circulation and said substance nozzle.

  Spray gun texturizing substances according to claim 2, characterized in that it further comprises an axial passage of the substance located in said nozzle (26), said passage of the nozzle communicating with the passage (28) of the matter by

the body.

  Spraying gun of texturizing substances according to claim 3, characterized in that it further comprises a conical annular passage (36) of atomizing air located between said air flow cap (30) and said substance nozzle (26), said atomizing air passage communicating with

  said air supply passage (24a).

  Spraying gun of texturizing substances according to claim 1, characterized in that it furthermore comprises means (40) for controlling

the supply of compressed air.