Abstract: The invention concerns an atomizing bowl (4) for coating product electrostatic rotary sprayhead unit (1), said bowl comprising a bell (7) for distributing the product made from a conductive material and arranged to be brought to high voltage when the sprayhead unit is in operation, so as to charge electrostatically said product by contact. The invention is characterized in that said bell is electrically connected to at least one corona discharge element (22, 25, 28) from one tapered end (22a, 25a, 25b, 28a), said tapered end being arranged in the proximity of said bowl outer surface. The bowl is electrically connected to a generator capable of detecting variations in the glow currents passing through the discharge elements (22, 25, 28) or the bowl tips.

Abstract: A nozzle hole of a conductive nozzle plate exposes the liquid surface of conductive ink. Ultrasonic generation means vibrates the ink for forming fine surface waves on the liquid surface so that the ink is sprayed from the nozzle hole as an atomized liquid particle group. A back plate provided on the opposite side of the nozzle hole in relation to a printing paper is supplied with a potential different from that for the nozzle plate, so that an electric field is formed therebetween. The sprayed liquid particle group is charged and hence urged by this electric field to adhere to the printing paper.

Abstract: A spraying device for dispensing electrostatic liquid droplets includes a container holding a liquid at one end, and having a nozzle assembly with an aperture at another end. The nozzle assembly includes a longitudinal hollow tube terminating in a metallic structure. The metallic structure includes a metallic base plate having at least one aperture formed therein for fluid communication with the hollow tube. The longitudinal hollow tube includes an end inserted in the liquid. A charge accumulator disposed in the liquid accumulates electrostatic charges. A wire conductor between the base plate and the charge accumulator transfers the electrostatic charges from the liquid to the nozzle assembly.

Abstract: A liquid fuel injection nozzle to supply atomized droplets of fuel to a combustion chamber arrangement in a gas turbine engine combustion system. The fuel droplets leave the passage through its upper end defined by an annular sharp edge of a tubular electrode which can be electrostatically charged for the sharp edge to impart electrostatic charge to the fuel droplets as they pass the edge.

Abstract: An electrostatic coating system having a rotary atomizing device formed of a non-conductive body member having an opening in an outer end thereof, a semiconductive member is disposed on a side portion of the body member, a first lip devoid of the semiconductive member is disposed about the opening of the body member proximate the outer end thereof, and a second lip is disposed radially outwardly of the first lip, between the first lip and the inner end of the body member.

Abstract: A comminuting liquid device, a medicament delivery device, an inhaler, a method of providing droplets for delivery to the respiratory tract, a pocket-sized dispenser, and a method of mixing liquids by droplet coalescence. Liquids are subjected to electrical potentials to produce electrically charged droplets for delivery to the upper respiratory tract.

Abstract: A disposable catridge for use with an electrostatic charging device. The disposable cartridge can have a reservoir configured to contain a supply of product suitable for electrostatic spraying, a nozzle configured and disposed to disperse the electrostatically charged product, and an electrode disposed to electrostatically charge the product prior to its dispersal. The disposable cartridge can also have an insulator for insulating the supply of product from electrostatic charge.

Abstract: A blast nozzle formed of a non-conductive material includes electrically conductive paths embedded therein to keep the build up of static electricity below an undesirable level. Stainless steel rods extend the length of the blast nozzle, providing a continuous electrical path.

Abstract: An electrostatic spray device and a cartridge for an electrostatic spray device that reduce the occurrence of electrically induced emulsion product separation are disclosed. The device and/or the cartridge may reduce electrically induced emulsion product separation by providing a conductive high voltage shield substantially around the product reservoir. Alternatively, the device and/or the cartridge may prevent the product located at the charging location from being in fluid communication with the product reservoir so that the product that is being charged cannot flow back into the product reservoir. The device and/or cartridge may alternatively reduce electrically induced emulsion product separation by minimizing the volume of product between the charging location and the exit orifice of the nozzle.

Abstract: An electrostatic spraying device which is designed to be portable, hand-held, self-contained and battery operated, with a disposable cartridge. The electrostatic spraying device is configured to provide a precise essentially constant flow rate of a product being applied, to provide uniformity and ease of application of the product, as well as to conserve product usage.

Abstract: In an electrostatic sprayer, a pulsating voltage developed using a battery or a generator as a power supply is stepped up using a step-up transformer. A resultant high-voltage pulse is rectified and applied to an electrostatic electrode. A spray jetted from a spray nozzle is thus electrified. Herein, the step-up transformer is located near the spray nozzle. Owing to this structure, a high voltage produced by the step-up transformer can be applied to the electrostatic electrode with a loss minimized.

Abstract: A paint spray system for directing paint to a part has a paint atomizer head having a bell housing and a bell-atomizer. An electrically conductive tape is applied to a surface of the paint atomizer. The tape may be applied to the bell housing or the front surface or side surfaces of the support housing. Tape is electrically connected to a power source to generate an electrical field and thereby an electrical force on charged paint particles produced at bell-atomizer. The electrical field repels the paint particles from the paint atomizer head to reduce the maintenance of the paint spray system.

Abstract: An electrostatic spraying device being configured and disposed to electrostatically charge and dispense a product from a supply to a point of dispersal. This device has a reservoir configured to contain the supply of product and a nozzle to disperse the product. A channel is disposed between the reservoir and the nozzle, wherein the channel permits the electrostatic charging of the product upon the product moving within the channel. A positive displacement mechanism is used to move the product from the reservoir to the nozzle. A portion of the high voltage electrode being disposed between the reservoir and the nozzle is used to electrostatically charge the product within the channel at a charging location. A mixing mechanism may be disposed between the reservoir and the nozzle to reconstitute any product which may have separated. The high voltage contact may be spring biased in direction towards the high voltage electrode.

Abstract: An electrostatic spray device that maintains a consistent charge-to-mass ratio in order to maintain a consistent target spray quality is disclosed. During steady state conditions, the high voltage power supply adjusts the output voltage level in response to changing environmental and/or operating conditions. During transient conditions such as start-up, shut-down and changing flow rate conditions, the high voltage power supply ensures that the charge-to-mass ratio is maintained. During, start-up, for example, the high voltage power supply charges the high voltage electrode to a predetermined voltage level before the product is delivered to the charging location. During shut-down, the product delivery is stopped before the high voltage power supply shuts off power to the high voltage electrode, and during changes in product flow rate, the voltage level of the high voltage electrode is adjusted to maintain a consistent charge-to-mass ratio.

Abstract: An electrostatic spraying device which is configured and disposed to electrostatically charge and dispense a product from a supply to a point of dispersal. The electrostatic spraying device has a reservoir configured to contain the supply of product and a nozzle to disperse the product. The nozzle being disposed at the point of dispersal. The nozzle has an exit orifice. A channel is disposed between the reservoir and the nozzle, wherein the channel permits the electrostatic charging of the product upon the product moving within the channel. A positive displacement mechanism is used to move the product from the reservoir to the nozzle. A power source supplies an electrical charge. A high voltage power supply, high voltage contact, and high voltage electrode are used. A portion of the high voltage electrode being disposed between the reservoir and the nozzle is used to electrostatically charge the product within the channel at a charging location.

Abstract: A method of reducing the droplet sizes of a composition sprayed from an aerosol spray device comprising a compressed gas propellant, which method comprises imparting a unipolar charge to the liquid droplets by double layer charging during the spraying of the liquid droplets from the aerosol spray device, the unipolar charge being at a level such that the said droplets have a charge to mass ratio of at least +/−1×10−4 C/kg.

Abstract: An electrostatic atomizer has a power source powering a charge injection device. The power source is arranged to vary the net charge injected by the charge injection device cyclically in accordance with a pattern of variation so that the net charge repeatedly increases to a higher value at or above a long-term breakdown value. The net charge injected is reduced by the power source to a lower value below the long-term breakdown value so that corona-induced breakdown is reduced. A method for electrostatically atomizing a fluent material is provided. The method includes the step of cyclically varying the net charge injected to reduce the occurrence of corona-induced breakdown.

Abstract: An electrostatic spraying device comprising a nozzle, means for establishing a column of material to be sprayed within a passage leading to the nozzle outlet such that the leading surface of the column is spaced from the nozzle outlet, means for pneumatically ejecting said column or part thereof from the nozzle and means for applying high voltage to the material so that the spray formed by breaking up of the column on ejection from the nozzle are electrically charged. The column of material in the passage is preferably a discreet slug having a leading surface spaced from the nozzle outlet and a trailing surface to which air, gas or vapor under pressure can be applied to effect ejection of the slug from the nozzle.

Abstract: An electrostatic atomizer comprises a power source for powering a charge injection device, a controller for controlling the net charge injected by the charge injection device, and a sensor for sensing breakdown precursors in the vicinity of the orifice and producing a feedback signal upon the occurrence of the breakdown precursors. The sensor is in communication with the controller and the controller is responsive to the feedback signal so that upon occurrence of the feedback signal, the controller decreases the net charge injected. A method of minimizing corona-induced breakdown in an electrostatic atomizer comprises the steps of providing a fluent material with a net charge to atomize the fluent material, and responding to the occurrence of breakdown precursors by decreasing the net charge of the liquid to avoid corona-induced breakdown.

Abstract: While plural kind of powder paints of different hues are mixed with each other without melting for preparation of a powder paint of a desire hue, a fluidity improver possessing a charge control function is simultaneously mixed into the powder paints without melting. The mixed powder paint containing the fluidity improver is charged, and then electrostatic powder coating is performed by the charged powder paint.

Abstract: A method of killing flying insects which method comprises spraying into the air in which insects are flying liquid droplets of an insecticidal composition, a unipolar charge being imparted to the said liquid droplets by double layer charging and charge separation during spraying, the unipolar charge being at a level such that the said droplets have a charge to mass ratio of at least +/−1×10−4 C/kg.

Abstract: A fluid supply cylinder with improved flusbability, useable for supplying paints to a dispenser in electrostatic coating systems. The fluid supply cylinder having generally a piston reciprocatingly disposed in a chamber of a body member, the piston having a head with a face opposite an end wall of the chamber, a plurality of chamber fluid ports disposed in the end wall of the chamber, and a plurality of fluid conduits between a corresponding one of the plurality of chamber fluid ports and a common outer fluid port, whereby the reciprocating piston draws fluid into the cylinder chamber and supplies fluid from the cylinder chamber through the plurality of chamber fluid ports in the end wall thereof.

Abstract: An electrostatic spraying device comprising a high voltage generating circuit powered by a low voltage circuit comprising one or more radiation sensitive elements and charge storage means.

Abstract: A device for comminuting liquid has a liquid supply with first and second outlets, a first electrohydrodynamic comminuter for subjecting liquid issuing from the first outlet to an electrical potential to cause the liquid to be commrinuted to form a comminution of one polarity and a second electrohydrodynamic comminuter for subjecting liquid issuing from the second outlet to an electrical potential to cause liquid to be commninuted to form a comminution of the opposite polarity. The first and second electrohydrodynamic comminuters are arranged so as to cause substantial admixing of two opposite polarity comminutions.

Abstract: An electrohydrodynamic dispensing device for comminuting a liquid which comprises a comminution site, a means for supplying liquid to the comminution site and a means for inducing an electrical charge at the comminution site sufficient to comminute the liquid supplied to it.

Abstract: An electrostatic spraying device is disclosed which is suitable for, but not limited to, dispensing an electrostatically sprayable substance for nasal or oral inhalation. Electrical charge is imparted to the spray particles by applying a high voltage to the substance prior to break up into a spray. In one embodiment, the device includes a nozzle portion for registry with the nasal or oral cavity and defines a passageway through which, in use, air can be drawn by inhalation on the part of the user. The substance to be sprayed passes into the passageway so that, with the assistance of user-induced air flow through the passageway, the resulting spray passes into the oral or nasal cavity.

Abstract: A device for dispensing a comminuted liquid to the upper respiratory tract, which comprises an electrohydrodynamic comminution device and a supplier of a liquid to the comminution device. And a device for comminuting a liquid, the comminution site of which is provided by fibers projecting from an end surface or edge, the edge or surface being composed substantially of fibers.

Abstract: Systems and methods are described for rapidly forming precision metallic and intermetallic alloy net shape parts directly from liquid metal droplets. A directed droplet deposition apparatus includes a crucible with an orifice for producing a jet of material, a jet destabilizer, a charging structure, a deflector system, and an impact zone. The systems and methods provide advantages in that fully dense, microstructurally controlled parts can be fabricated at moderate cost.

Abstract: Apparatus and a concomitant method for electrostatically depositing select doses of medicament powder at select locations on a substrate. Specifically, the apparatus contains a charged particle emitter for generating charged particles that charge a predefined region of a substrate and a charge accumulation control circuit for computing the amount of charge accumulated upon the substrate and deactivating the emitter when a selected quantity of charge has accumulated. Additionally, a triboelectric charging apparatus charges the medicament powder and forms a charged medicament cloud proximate the charged region of the substrate. The medicament particles within the medicament cloud electrostatically adhere to the charged region. The quantity of charge accumulated on the substrate at the predefined region and the charge-to-mass ratio of the medicament powder in the cloud control the amount (dose) of medicament deposited and retained by the substrate.

Abstract: A spray gun for applying powder to coat a work piece uses triboelectric and optionally a corona discharge electrode to charge powder particles electrostatically. The gun communicates with a source of pressurized air through a handle with an air valve controlling flow of the air. Powder in a container in fluid communication with the air flow is fluidized and entrained when the valve is opened. A nozzle with an internal surface defining a passageway to an open end communicates with the powder container. The internal surface of the nozzle frictionally imparts a net electrical charge of a first polarity to part of the powder by frictional contact during spraying. A plurality of discrete tubes are disposed in the central passageway and impart a net electrical charge of a second polarity to another part of the powder due to frictional contact as that part flows around and through the tubes.

Abstract: An apparatus for use in electrostatically applying coating material to an object includes a nozzle which directs a flow of coating material toward the object. A power supply unit provides an electric field to electrostatically charge the coating material. Control circuitry is provided to monitor the operating efficiency of the power supply unit and to provide an output signal when there is an impending failure of the power supply unit. The control circuitry monitors the relationship between an input current to the power supply unit and an output current from the power supply unit. When the relationship between the input current to the power supply unit and the output current from the power supply unit is outside of a predetermined range, the control circuitry is effective to provide an output signal to notify an operator that there is an impending power supply unit failure.

Abstract: The invention features an improved interface between a microfluid chip and a mass spectrometer. It has been found that by connecting a very fine tube (or "interface tip") to an outlet port of a microfluid chip, the sensitivity of the mass spectroscopy analysis of materials exiting the outlet port of a microfluid chip is greatly enhanced.

Abstract: An apparatus for supplying a two-component, electrically conductive coating material which includes a first flow path for supplying a metered quantity of a catalyst from a source to a mixing device, a second flow path for applying a metered quantity of resin from a source to the mixing device, a third flow path for transferring the resulting two-component coating material from the mixing device to at least one coating dispenser which discharges electrostatically charged coating material onto a substrate, and, at least one voltage block device for maintaining a continuous voltage block between the electrostatically charged coating material and the sources of catalyst and resin.

Abstract: A powder spray coating system includes a power source and an electrical supply line connected to the power source. A spray gun sprays powder in a spray pattern onto a part. The spray gun includes an electrode which charges powder as the powder is dispensed from the gun toward the part. The electrode is connected to the electrical supply line. A first current sensing device is located in the electrical supply line measuring gun current between the power source and the electrode. An ion collector or ABI probe is mounted with the gun for collecting free ions produced by the electrode. The collector has a forward portion positioned near the spray pattern and is spaced from the electrode. The collector is connected to a ground line. A second current sensing device is located in the ground line measuring back current between the ion collector and ground. A controller is connected between the power source and the electrode to control the gun current.

Abstract: A device for comminuting a liquid, which produces at least two sprays of droplets formed by electrohydrodynamic comminution, the device being arranged so that in use sprays of opposing polarity are formed which are substantially admixed after formation, so as to provide a comminution having a residual electrical charge.

Abstract: An isolator system for an attachment to an electrostatic field sprayer discharging liquids having an electrostatic potential thereon comprising a series of spaced apart flat discs that shed water in both directions, and which are made of an insulating material and mounted concentrically on the attachment. The attachment has a length that extends substantially vertically downward, and said discs are spaced apart in vertical direction. The discs are graduated in size with the smallest disc on the bottom, and any discs above the bottom disc are of larger diameter than the next adjacent lower disc.

Abstract: A grounded insulated electrostatic supply tank comprised of a conductive tank that has several liners to fully insulate a waterborn fluid in the tank from ground. The interior of the tank and a sealed lid are coated with an insulating liner. An intermediate lining is placed in the tank and third interior insulating inner liner is inserted in the tank and has a lip that wraps around the upper rim of the tank and is sealed between the lid and the tank. Electrostatic spray equipment is connected to the tank by a coaxial hose having an inner non-conductive hose and preferably, an outer hose that is conductive. Inner non-conductive hose extends through the lid into an insulating teflon pick-up tube that extends to near the bottom of the tank. Depleted waterborn fluid in the tank is grounded after use by a manual probe or by a piston operated automatic grounding system.

Abstract: An aerosol generator for producing fine droplets in large quantities is used in an apparatus which can produce small particles having a high degree of crystallization and large surface area. The aerosol generator includes a chamber having a porous filter and a solution, and air is supplied to an upper side of the filter. A low pressure driving force, such as by a vacuum, is supplied to the chamber below the filter to generate droplets. A pyrogenetic reactor dries and pyrolyzes the droplets produced by the aerosol generator to give ultrafine particles and an ultrafine particle collector collects the ultrafine particles obtained by the pyrogenetic reactor. The low pressure driving force moves the droplets through the pyroletic reactor.

Abstract: An apparatus for electrostatically coating a workpiece has an insulating separator valve mechanism for electrically separating a paint supply passage for supplying an electrically conductive paint to a coating gun, into a paint supply passage to which a high voltage will be applied and a paint supply passage to which no high voltage will be applied. The insulating separator valve mechanism has a first valve body connectable to said paint supply passage through a first on/off valve, and a second valve body connectable to said paint supply passage through a second on/off valve. While the first and second valve bodies are connected to each other and the first and second on/off valves are closed, a paint trap is cleaned by a cleaning medium, which is discharged into a second dump passage. A process of cleaning the paint trap for a paint color change is efficiently and reliably carried out to reliably remove paint residuals from the paint trap.

Abstract: A flat panel display spacer metering apparatus comprises a motor-driven rotatable disc, having a plurality of cavities distributed around a first surface of the disc. As the disc is rotated, its cavities are filled with spacers from a storage and fill device, configured as a hollow cylinder installed in a bore of a metering block. To facilitate transfer of spacer elements stored in the storage cylinder into cavities in the disc, an axially biased plunger continuously pushes the spacer elements against the first surface of the disc. As a result, whenever rotation of the disc exposes one or more of its cavities to the open end of the cylinder, spacers are forced into and fill the cavities. As the disc is further rotated and successive ones of its cavities are filled with spacers, the filled cavities are brought into alignment with a spacer element ejection head. The ejection head continuously directs a fluid, such as dry nitrogen gas against the cavity-containing surface of the disc.

Abstract: An electrostatic coating machine comprising at least two paint tanks (13A, 13B) for pushing out a paint by a pressure of a hydraulic fluid which one is attached to a rotary base (14) while being electrically insulated from each other, and can be positioned to a coating position opposed to the machine body (3) by the rotation of the rotary base (14) such that while one paint tank is at the coating position, the other paint tank is engaged with a paint charging attachment (22) that is disposed being electrically insulated from the machine body (3) and has a paint supply port (Ps) for supplying a cleaning fluid and a paint of a next color and a drain recovery port (Dr) for recovering drains. Cleaning/paint charging time can be shortened to improve operation efficiency and insulation countermeasure for the paint supply system can be saved.

Abstract: A device for dispensing a liquid for inhalation, which comprises an unshielded electrohydrodynamic comminution means (1), a means for supplying a liquid to the comminution means, a sharp discharge electrode (12) and, optionally, a means for charging the discharge electrode to a polarity opposite to that of the comminution means, wherein the discharge electrode is located so as to direct gaseous ions into the body of the comminuted liquid and thereby to fully or partially discharge the comminuted liquid.

Abstract: An electrostatic spraying device for spraying liquids comprises a hollow capillary structure having a convoluted inner surface, one end of which contacts a reservoir of an electrostatically sprayable liquid preferably having a viscosity from 1 to 20.times.10.sup.-6 m.sup.2 /s and a volume resistivity from 2.5.times.10.sup.6 to 5.times.10.sup.8 ohm cm, the other end of which terminates in an atomization tip, and means for applying high voltage to the liquid in order to cause the liquid at the atomization tip to break up into a plurality of electrostatically charged droplets. Cartridges for use in the electrostatic spraying device are also described.

Abstract: A system for producing three dimensional components by bonding together successive layers of a porous material with droplets of a binder material. A binder printhead has an array of nozzles which controllably supply jets of binder material droplets to the layers of porous material. The printhead is scanned in a raster scan fashion over each layer of porous material along a first scan axis in one direction to provide first fast scanning paths of droplets. The printhead is then moved laterally of such one direction and is then moved along the fast-scan axis in the opposite direction to provide second fast scanning paths of droplets which are interlaced with the first scanning paths. The supply of the droplets to the porous material can be controlled so as to control the overlapping thereof to produce various desired surface and interior characteristics of the components.

Abstract: An ultra-low flow rate electrospray ionization (ESI) source provides flow rates in the range of 1.0 nL/min or less. The source is comprised of a needle which is fabricated by laser-heated pulling of fused-silica tubing, followed by chemical etching and surface metallization. The pulling results in formation of a slowly tapering capillary within the needle which tapers to a tip having a very small inner diameter. The etching process sharpens the outer wall of the needle to a very sharp tip, and the combination of these parameters results in the ultra-low flow rate capability. After a metal electrical contact is formed on the exterior wall of the needle, an electrically insulating overcoating is preferably deposited thereon which locks the contact in place, thereby greatly increasing needle life, and also restricting the electrical contact point to the very tip of the needle.

Abstract: A spray coating device for the electrostatic spray coating of articles. The device includes a spray appliance which is carried by an elongated tubular support housing through which all connecting conduits for the spray appliance extend. The tubular support can be supported by a carrier device, such as a reciprocator, located outside of a spray booth and can extend through a side wall opening in the spray booth for positioning the spray appliance in the spray booth. The spray appliance may be a powder coating material applicator. Preferably, the top surfaces of the spray appliance and the tubular carrier are substantially continuous and without significant steps and of the smallest possible size in order to minimize the deposit of coating material and dust.

Abstract: An apparatus for supplying electrically conductive coating material, such as water-based paint, includes a manifold connected to a high voltage electrostatic power supply and to one or more coating dispensers, and, a number of coating transfer units which are movable between a discharge position or station at the manifold and a filling station physically spaced from the manifold. Each of the transfer units includes a combined shuttle and pumping device which initially receives coating material at the filling station, and is then movable to the discharge station where the coating material is transferred from the pumping device, through the manifold, and then to one or more coating dispensers for deposition onto a substrate.

Abstract: An electrostatic painting system for painting an object or article under corona discharge. The system comprises a spray gun which is formed at its tip end with annular air ejection opening through which air is ejected under pressure to atomize liquid paint ejected from a paint ejection opening formed at the tip end of the spray gun. An annular wire netting-like negative electrode is fixedly disposed at the tip end of the spray gun and located coaxially around the air ejection opening. The electrode functions to form an electrostatic field and a corona discharge field between the electrode and the object to be painted and to provide electric charge to the atomized paint, upon a high negative voltage being applied to the electrode.

Abstract: A coating system comprises a source of electrically non-insulative coating material, a dispenser for dispensing the coating material toward an article to be coated thereby, an electrostatic high potential supply for supplying charge to the coating material, means for coupling the high potential supply across the dispenser and the article, a first reservoir, and a first valve. The first valve has a first housing providing first, second, third, fourth and fifth ports, and a first component movable within the first housing and having a first passageway selectively to connect the first port to the second port to permit the flow of coating material from the first port to the second port. The first port is coupled to the coating material source, the second port to the first reservoir, and the third port to the dispenser. The second port is coupled to the third port to permit the flow of coating material from the first reservoir to the dispenser. A source is provided for an electrically non-conductive fluid.

Abstract: An electrostatic coating system includes an electrically nonconductive coating material tube is disposed in an electrically conductive handle portion of the spray gun and extends into an electrically nonconductive barrel or extension portion of the spray gun. The coating material tube is preformed to and maintains a configuration corresponding to a configuration of a passage in the handle and extension portions of the spray gun. A packing cartridge is connected between the trigger and the spray gun valve and has a tapered end portion which is encircled by an O-ring seal which engages a tapered bore in the extension portion of the spray gun. The handle portion of the spray gun is grounded through a conductive inner layer of an air conduit connected to the spray gun. An atomizing air passage extends from the handle portion of the spray gun through the extension portion to the nozzle. A pattern air passage also extends from the handle portion through the extension portion to the nozzle.