Abstract: A spray gun kit for dispensing coating material, for example paint, includes a common gun body and an assortment of nozzle attachment sets, each of which operates according to a unique atomization process suited for particular applications. The common gun body incorporates as many of the parts which otherwise would be repeated in each nozzle attachment. The arrangement reduces the overall cost, otherwise required, in providing an entirely assembled spray gun for each application and provides greater overall flexibility.

Abstract: A feed channel is provided upstream of a powder-spraying discharge opening in a spray device, with a pipe having an injector which coaxially surrounds such pipe length for the coaxial introduction of accelerating gas. Downstream of the injector an elongated guide member is present in the feed channel. In this way the complete cross-sectional shape of the feed channel is progressively changed along the longitudinal axis of the feed channel to a cross-sectional shape which is annular and has a smaller cross section of flow passage. This results in a further accelerating of the stream of powder. The guide member and the region of the wall of the feed channel which surrounds the guide member at a distance therefrom consists of an insulating material on which powder particles which move past are charged electrically by friction.

Abstract: A method of and apparatus are disclosed for spraying powder, particularly for the coating of articles, by introducing a spray gas into the powder as the latter is expelled from a spray opening. An additional gas is injected into the stream of powder upstream of the point where the spray gas is introduced, in such a manner as to exert a cyclone effect on the stream of powder, force the powder radially outward and simultaneously drive it in the direction of flow of the powder.

Abstract: An atomizer for coating an object with powder includes a spray gun with a central feed passage and an atomizer gas flow passage with an outlet radially outside the feed channel. Both the outlet from the feed channel and the atomizer gas passage outlet are located at a widening atomizer gas outlet. Upstream of the spray gun is a body with a plurality of obliquely inclined, axially extending flow channels in it which impart spiral rotation to the gas-powder mixture entering the feed channel in the spray gun. The housing for the body having the inclined flow channels in it is conically tapered upstream and downstream of that body, and upstream of that body there is an upstream facing conical element for directing flow into the flow channels.

Abstract: An electrostatic spray coating device in which a coating material passes through a tube in a body and is electrostatically charged by electrodes as it exits the body. In the body is mounted a bar transformer for providing a high voltage to the electrodes. A magnetic conductor bar, such as a ferrite core, is also mounted in the body outside the bar transformer for conducting magnetic flux between its ends, thus providing a flux circuit within the body. If more than one conductor bar is used, the bars are spaced to facilitate heat discharge. A multiplying and rectifying circuit such as a Greinacher circuit may also be mounted in the body between the transformer and the electrodes, with its components distributed around the tube.

Abstract: A pressure regulating device for gaseous and liquid fluids contains a pressure regulator with an inlet and an outlet and a pressure space between them. The pressure in that space is regulated by a shiftable main valve. An actual pressure value chamber is connected with the pressure space. A set value or desired value chamber communicates through a diaphragm with the actual value chamber. The diaphragm is movable to move the valve body for adjusting the actual pressure in the pressure space to the desired pressure in the desired value chamber. An electromagnetic set-point adjuster adjusts the pressure in the desired value chamber. The adjuster includes a set-value transducer, with an actual value sensor which is exposed to the pressure in the pressure space, and the transducer produces an electric signal corresponding to that pressure.

Abstract: A spray-coating booth having on its side walls several air cleaners with easily interchanged and cleaned filter units that are relatively light in weight and can be carried by hand. In accordance with the design of the booth, the dimensions of the spray-coating area can be varied and the filter units can be interchanged with other types of units such as sprayers. Undesirable accumulation of powder is avoided because the air cleaners continuously precipitate powder filtered from the air. Powder transporting means within the booth, which may be inclined chutes with a fluidized bed, transport this excess powder from beneath the air cleaners at the side wall to the floor of the booth. The floor of the booth extends below the entire spray coating region and thereby also serves to collect excess spray powder which falls directly upon it. The powder is then returned for use to the spray-coating region.

Abstract: A spray-coating control system for automatically spraying articles moved through a spray-coating region by a conveyor is disclosed. A pulse generating means such as a shaft encoder, which is connected to the conveyor, generates conveyor movement pulses in response to movement of the conveyor. These pulses are processed by a timing signal generating circuit to produce timing signals at a fraction of the frequency of the conveyor movement pulses and in synchronism therewith. The timing signals are used to control the operation of the sprayer synchronously with the movement of the articles through the spray-coating region. Hangers for suspending the articles from the conveyor are nominally equally spaced along the conveyor. These hangers can, however, be positioned at varying distances from one another along the conveyor due to stretching of local sections of the conveyor.

Abstract: A spray coating system for spray coating articles as they move through a spray-coating region is disclosed. The system includes a conveyor for sequentially transporting a plurality of articles through the spray-coating region along a first path. A sprayer applies a spray coating to each article as it is transported through the spray-coating region. The sprayer is movable along a second path which runs parallel to the first path. A control circuit controls the movement of the sprayer along the second path as a function of the difference between the actual and desired instantaneous positions of the sprayer.

Abstract: A spray coating system for spray coating articles as they move through a spray-coating region is disclosed. A conveyor sequentially transports a plurality of articles through the spray-coating region. A plurality of hangable members are located at spaced locations along the conveyor, each hangable member being adapted to received, at the option of the user, a single member to be spray coated whereby each hangable member may, or may not, have a member to be sprayed associated with it. Conveyor movement pulses having a frequency representative of the speed of the conveyor are generated. A start signal is also generated whenever a hangable member having an article associated with it reaches an initial position upstream of the spray-coating region. The articles are sprayed as they move through the spray-coating region in a manner determined by the start signals and the conveyor movement pulses.

Abstract: A method and apparatus are disclosed for the spray-coating of the interior of a hollow body, one region of which, e.g. a seam, must receive a heavier coating than the remainder of the surface to be sprayed. A single spray coating operation is performed, in which a relatively heavy spray jet is concentrated on the seam and a relatively thin cloud of coating material is used to coat the entire interior surface of the body. Preferably, a cloud of electrostatically charged coating material is formed by an atomizer fed by a feed conduit from which a certain amount of coating material is diverted to be formed into the relatively highly concentrated spray jet directed at the seam. The relatively high-velocity particles of material of the spray jet which is concentrated onto the seam and the relatively low-velocity particles of material of the coating cloud together produce on the seam a thinner layer of material than would normally suffice and which, nonetheless, adheres well.

Abstract: An apparatus is disclosed for the automatic coating of articles. The apparatus has a spray device controlled by a programmed control device. A transport device transports the articles along a predetermined path to a coating position and then away therefrom after coating. A sensor monitors the position of the article and generates signals representative thereof, preferably generating one signal each time the article moves a predetermined distance (e.g. 2 cm.) along the path. A second sensor generates additional signals to the control device when an article passes a predetermined point, also indicating which of several types of articles has been detected. The control device controls the spraying process responsive to these signals. If desired, portions of the article that are moved sequentially into the coating position can be sprayed in different manners, e.g. with the spray devices positioned or oriented differently, or using different coating materials, etc. The control device is preferably reprogrammable.

Abstract: The invention is a pressure regulator for gaseous and liquid fluids of the type comprising: a main valve disposed between an inlet and an outlet; a control pressure space, the pressure in which acts on the main valve body and which is preferably connected via a choke with the inlet and via a control valve with a vent; means for setting a desired value for the outlet pressure, which means urges the control valve body against a force due to the control pressure; and means for exerting a force on the main valve body proportional to the outlet pressure and directed against the force exerted thereon by the control pressure. In one embodiment, such a pressure regulator is used in a pneumatic conveyance device for a powdered to granulated bulk material.

Abstract: A method and apparatus are disclosed for the spraycoating of the interior of a hollow body, one region of which, e.g. a seam, must receive a heavier coating than the remainder of the surface to be sprayed. A single spray coating operation is performed, in which a relatively heavy spray jet is concentrated on the seam and a relatively thin cloud of coating material is used to coat the entire interior surface of the body. Preferably, a cloud of electrostatically charged coating material is formed by an atomizer fed by a feed conduit from which a certain amount of coating material is diverted to be formed into the relatively highly concentrated spray jet directed at the seam. The relatively high-velocity particles of material of the spray jet which is concentrated onto the seam and the relatively low-velocity particles of material of the coating cloud together produce on the seam a thinner layer of material than would normally suffice and which, nonetheless, adheres well.

Abstract: An atomizer has a channel through which material to be atomized, preferably comprising a transport gas and a powder, liquid or granular material, flows in a first direction. At or slightly downstream from the downstream end of the channel, preferably an atomizer gas is injected into the stream to be atomized, the injection occurring at an angle to the first direction. Preferably the atomizer gas is injected to impart a rotary motion to the stream. At the downstream end of the channel is a funnel-shaped outlet whose surface is so shaped that the stream can adhere to the interior surface of the outlet under the Coanda effect, producing an atomized cloud of transversely uniform density. A gas jacket may be used to control the shape of the cloud. The flow of both the atomizer gas and the gas forming the gas jacket is preferably adjustable in speed and direction.

Abstract: A method for spraying a powdered to granular bulk material is disclosed in which a stream of propellant gas is mixed with the bulk material and the mixture is sprayed by a suitable known spraying device. Unwanted clogging of conduits and wastage of the bulk material are prevented by rerouting the flow of the bulk-material/gas mixture at a point upstream from the spray device whenever it is desired to interrupt spraying. A device for effecting this method is also disclosed.

Abstract: A method and apparatus are disclosed for spray coating one or a series of objects with at least two powder coating materials in succession or alternately. When a change of the material being sprayed is to be effected, the flow of the first material is terminated, preferably by means of a squeeze valve, the flow path of the first material is flushed with a fluid, preferably air, and the second spray material is sprayed. The relative positions of the apparatus forming the respective flow paths of the two spray materials are not changed during this process. In one preferred embodiment, feed conduits corresponding to respective spray materials converge into a single delivery conduit. Each feed conduit includes means for closing and opening it. Means are provided for flushing at least part of a given feed conduit, or the delivery conduit, or both, with a fluid. The flushing can preferably be done pulsatingly.

Abstract: A pneumatic conveyor for powdered to granular bulk material, having adjustable conveyance capacity, is disclosed, the capacity being adjusted by electromagnetic adjustment of a pressure regulator disposed in a conduit used to supply a propellant for drawing the bulk material from a storage container thereof and for conveying it. A supplemental supply of gas, which may be but need not be different from the propellant gas, may be provided to control the flow of propellant gas independently of the first pressure regulator. In this case, the flow of the supplemental gas may itself be controlled by a second pressure regulator. The pressure regulators operate according to the diffuser or Venturi principle. The device may be particularly advantageously applied to the spray-coating of articles with a bulk material.

Abstract: An electrostatic spray gun having an installed high-voltage generator, connected at its low-voltage side with an installed switch element for turning-on and turning-off the high-voltage generator. The spray gun further is provided with a flow channel for an atomizing gas, the flow channel being connected with a pressure line. A manually-operated closure valve is arranged in the flow channel. The switch element is structured as a flow-actuated or flow switch and is arranged in the flow channel and its movable contact is coupled with a closure element of a differential pressure valve arranged in the flow channel. In this way it is possible to only then turn-on the high-voltage generator when the atomizing gas flows in an undisturbed fashion through the flow channel. Disturbances in the flow of the atomizing gas, whether such be due to clogging of the nozzle at the spray gun, or due to a malfunction of the pressure source of the atomizing gas, thus automatically turn-off the high-voltage generator.

Abstract: The disclosure concerns an atomizer head used for atomizing wet lacquer, or the like. The atomizer head has an air conduit communicating with an air outlet part and has a liquid conduit communicating with a liquid outlet part. The air outlet part is radially outside the liquid outlet part. There is an inner part of the atomizer head which adjoins the outlet end of the liquid conduit. The inner part has an outside which is preferably trumpet shaped. The liquid conduit outlet end communicates with the outside of the inner part through obliquely extending ducts. There is an intermediate part that is outside the outlet end of the liquid conduit and outside the inner part. A cap is positioned outside the intermediate part. The air conduit is in part defined between the intermediate part and the cap. The intermediate part has a peripheral flange which is engaged by the interior of the cap. The flange has grooves extending along it for passage of air. The flange is in the air conduit.