EP0227992A2 - Electrostatic spray gun - Google Patents

Electrostatic spray gun Download PDF

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Publication number
EP0227992A2
EP0227992A2 EP86117181A EP86117181A EP0227992A2 EP 0227992 A2 EP0227992 A2 EP 0227992A2 EP 86117181 A EP86117181 A EP 86117181A EP 86117181 A EP86117181 A EP 86117181A EP 0227992 A2 EP0227992 A2 EP 0227992A2
Authority
EP
European Patent Office
Prior art keywords
electrostatic spray
spray gun
handle
gun according
electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86117181A
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German (de)
French (fr)
Other versions
EP0227992B1 (en
EP0227992A3 (en
Inventor
Wolfgang Kuhn
Norbert Buchholz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kopperschmidt-Muller GmbH and Co KG
Original Assignee
Kopperschmidt-Muller GmbH and Co KG
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Application filed by Kopperschmidt-Muller GmbH and Co KG filed Critical Kopperschmidt-Muller GmbH and Co KG
Priority to AT86117181T priority Critical patent/ATE46459T1/en
Publication of EP0227992A2 publication Critical patent/EP0227992A2/en
Publication of EP0227992A3 publication Critical patent/EP0227992A3/en
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Publication of EP0227992B1 publication Critical patent/EP0227992B1/en
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0531—Power generators

Definitions

  • the invention relates to an electrostatic spray gun for liquid or in particular powdery materials, with a gun body that has a handle and a trigger, with a gun tube connected to it with an outlet opening, which via a material channel with a material connection arranged in front of the trigger and optionally via an air duct is connected to an air connection, and to a high-voltage system which is partially held in the handle and has a high-voltage generator and at least one high-voltage electrode.
  • the entire high-voltage generator In a known spray gun of this type (EP-OS 157 199), the entire high-voltage generator, the construction of which is not described in detail, is housed in the handle.
  • the handle For this purpose, it has a plastic jacket which is shaped like a handle and has the air connection and the first section of the air duct on its rear side.
  • the material connection is on the front End of the gun body immediately behind a separation point.
  • the gun tube which is fastened to the gun body by a screw connection, has several channels, namely a central material channel and outside of it each offset by 120 °, a channel for atomizing air, a channel for shaped air and a channel for a high-voltage cable that to the spray head arranged electrode leads.
  • the invention has for its object to provide an electrostatic spray gun of the type described in the introduction, which makes it possible, while largely maintaining the favorable center of gravity, to design the high-voltage generator larger or to include other functional elements in the handle without the handle having too large dimensions.
  • the high voltage generator consists of two assemblies, one of which is arranged on the back of the handle, contains an oscillator and a transformer and is provided with a low voltage input, and of which the other assembly in the gun body between the handle and arranged the material connection is, contains a voltage multiplier and is provided with a high voltage output.
  • the heaviest part of the high-voltage generator namely the transformer, is still under control. But it has moved as far back as possible.
  • Due to the position of the first module there is enough space in the front part of the handle for further functions.
  • the position of the second module has the advantage that the distance between the high-voltage output and the electrode is smaller, that is, the required high-voltage line is shorter.
  • the first assembly preferably has a housing which is interchangeably inserted in a recess in the gun body provided on the handle back and forms the rear of the handle with its exposed rear wall.
  • the first assembly therefore occupies the very rearmost position, which improves the center of gravity. It can also be easily replaced.
  • the housing is made of metal and is grounded. This results in increased safety for the operator. Because the ball of your hand is automatically in contact with the housing during operation, so that the operator is also grounded.
  • the metal housing also serves as a heat sink for dissipating the heat generated in the transformer.
  • the housing has a U-shaped cross section with the width of the handle. This will cover the entire rear section of the handle formed by the housing.
  • the housing has a relatively large width and can therefore either accommodate a larger transformer or, with the same volume, otherwise have a smaller depth.
  • the handle on the front can have a recess in which the trigger provided with side walls constantly engages. There is therefore no risk of any parts getting caught between the trigger and the handle.
  • the elements actuated by the trigger such as an air valve, are protected.
  • a switch in particular a proximity switch, can be arranged in the front part of the handle below the trigger, which can be actuated by a control element on the underside of the trigger. In this way, the switch can be assigned to the first assembly in a spatially closely adjacent manner.
  • the switch is preferably axially displaceable by a separation path in a bore extending parallel to the front of the handle. The operator can therefore disable the switch by axial displacement. Since this is done on the handle, this ineffectiveness can be done by hand.
  • the switch should be switched on with one pole in the low-voltage supply line of the first module running in the handle.
  • the result is an extremely short connecting line in the handle. It is then sufficient to provide a simple supply cable that places little strain on the spray gun.
  • Such a device is readily suitable for a liquid gun with pressure atomization and an air valve operated by the trigger. If another electrical device is switched on when the trigger is actuated, for example powder delivery in the case of a powder gun, this can be done with the aid of a current interrogation circuit which monitors the current flowing to the high-voltage generator.
  • the gun body is particularly advantageously divided between the handle and the second assembly, and the second assembly can be inserted into the front gun body part from the division level. This allows the second assembly to be replaced without difficulty.
  • the at least one electrode is arranged in the gun body and the gun tube can be separated therefrom.
  • this leads to a saving in weight and a favorable position of the center of gravity, because the electrode is in the vicinity of the high-voltage output and no high-voltage cable leading to the outlet opening has to be provided.
  • the gun barrel is free of parts of the high-voltage system and can therefore be cleaned easily. This is because cleaning can neither mechanically damage the high-voltage electrode, nor can parts of the high-voltage system be attacked by cleaning agents. Since there is no need for a high-voltage contact connection at the separation point no alignment of rotation angle to be considered when assembling the parts.
  • an air tube can be arranged in the gun tube, which is also connected to the gun body in a pluggable manner at any point of rotation.
  • the electrode should be located in an inlet connection from the material connection. Here it is also secured against unwanted touch.
  • the electrode should be located in an air duct passing through the second assembly.
  • the electrode is also protected against contact here.
  • the at least one electrode can also be arranged in the gun body in such a way that after removal of the gun barrel in the event of an inadvertent actuation of the trigger, an operator cannot receive a blow and there is no sparkover which could lead to an explosion, for example, in a solvent atmosphere. It is only necessary to ensure that the distance of the at least one electrode from the end face of the separation point is greater than the sparkover gap. In the same way, the distance of the electrode in the material channel from the material connection and the distance of the electrode in the air channel from a throttle valve arranged near the handle should be greater than the sparkover gap.
  • the illustrated powder spray gun has a gun body 1 and a gun tube 2, which are connected to one another at a separation point 3 along a cylinder surface 4.
  • the gun body 1 has a rear part 5 with a handle 6 and a front part 8 connected to it via a parting plane 7, on which a material inlet connection 9 with a material connection 10 is formed.
  • a material line 11 is attached to this material connection 10.
  • An air tube 12 is arranged in the interior of the gun tube and is connected to the gun body 1 at the separation point 3 via a cylindrical surface 13 in any rotational angle position.
  • This air tube 12 is provided with an impact body 14 at the front. This results in a material channel between the material connection 10 and an outlet opening 15, the first section 16 of which extends in the inlet connection and the second section 17 has an annular cross section and is arranged between the gun tube 2 and the air tube 12.
  • An air connection 18 is connected to an air line 19.
  • a first section 20 of an air duct extends from it, which leads via an air valve 21 that can be switched on and off and an adjustable air throttle valve 22 to a second section 23 of the air duct, which runs first in the gun body 1 and then in the air pipe 12.
  • a high-voltage generator consists of a first assembly 24 on the rear of the handle 6 and a second assembly 25 in the gun body 1 between the handle 6 and the separation point 3.
  • the first assembly 24 has a low-voltage input 26, which is connected to an electrical supply line 27, one Oscillator 28 and a transformer 29, which are embedded in an insulating plastic 30 and surrounded by a housing 31 made of metal with a U-shaped cross section.
  • This housing is grounded via a line 32. It is inserted into a recess 33 of the handle 6 in such a way that its rear side 34 is exposed and is gripped by the operator's palm in operation.
  • the two side walls 35 and 36 of the housing have a distance equal to the grip width.
  • the entire assembly 24 is held in the recess 33 in an easily replaceable manner.
  • the output of the first assembly 24 is connected to the input of the second assembly 25 via a line 37 running in the gun body 1.
  • This has the usual components of a voltage multiplier circuit 38, in particular a cascade of capacitors and rectifiers.
  • the high-voltage output 39 is arranged on the one hand with an electrode 40 in the first section 16 of the material channel and on the other hand with an electrode 41 in that part of the second air channel section 23 which is located in the interior of the second assembly 25. If you dismantle the gun body 1 into its two parts 5 and 8, the second assembly can be easily replaced from the division level 7.
  • the air valve 21 is actuated by means of a trigger 42, which is pivotable about a pivot point 43 and has side walls 44, which are already in the rest position engage in a recess 45 on the front of the handle 6.
  • the recess is sufficiently large that the trigger 42 can perform the full actuation stroke. There is no risk of any parts getting caught.
  • the trigger 42 can be injection molded from plastic, for example.
  • a control element 46 which allows a switch 47 which is also located in the front handle part to be actuated.
  • a switch 47 which is also located in the front handle part to be actuated.
  • it is a proximity switch 47, which is actuated by a metallic control element 56. But it can also be a reed contact that is actuated by a magnet.
  • the switch 47 is switched on via a line 47a with one pole in the supply line to the first module 24.
  • the switch 47 is arranged in a cylindrical slide 48 which is located in a cylindrical bore 49.
  • the slide is provided with a radial arm 50 which slides along a curve 51 when pivoted through 90 ° and thereby pulls the slide 48 downward against the force of a return spring 52.
  • the switch 47 becomes ineffective. It can no longer be operated by the control element 46.
  • the radial arm 50 can be operated by the operator with the little finger of the hand holding the handle 6.
  • the electrode 50 in the material channel has a distance A from the material connection 11 which is greater than the sparkover gap at the given high voltage.
  • the distance B of this electrode to the end face 53 of the separation point 3 is also greater than this sparkover gap.
  • the center of gravity of the pistol is approximately in the grip area. Because the torque caused by the weight of the front parts 2, 8 and 12 is counteracted by the torque caused by the weight of the first assembly 24, in particular the transformer 29.
  • the gun tube 2 and the air tube 12 do not carry any parts carrying high voltage, they can be cleaned easily.
  • the first section 16 of the material channel remaining on the gun body is short and can be cleaned by blowing through it. When reinserting the pipes mentioned, no particular angle of rotation position has to be taken into account.
  • the plug enables easy removal and assembly.
  • the spray gun is easy to handle because only a material line 11, an air line 19 and an electrical line 27 have to be connected and attack the latter two lines on the underside of the handle.
  • a powder spray gun is illustrated. However, the same principle can also be applied to liquid spray guns, the material channel running centrally and the air channel concentrically.
  • a current detection stage can be switched on in line 27, which responds when a current flowing to the high-voltage generator 24 occurs and then a pump, a blower, a valve or the like. turns on for the purpose of material handling.

Abstract

A portable electrostatic spray gun for liquid and/or pulverulent materials has a body with a grip and a second portion which carries a detachable barrel and has an inlet for admission of material to be sprayed. The rear side of the grip has a socket for a first unit of the high-voltage generator. A second unit of the generator is installed in a chamber provided in the second portion of the body and being accessible upon separation of the second portion from the grip. The grip contains a proximity switch which is actuatable by the trigger and can be deactivated by rotating it in the grip. The first unit of the generator has a transformer and an oscillator connected to a low-voltage input, and the second unit has a voltage multiplier connected with two high-voltage electrodes, one in the inlet and the other in an air admitting channel which is provided in the second portion of the body and includes a passage in the second unit of the generator.

Description

Die Erfindung bezieht sich auf eine elektrostatische Sprühpistole für flüssige oder insbesondere pulverförmige Materialien, mit einem Pistolenkörper, der einen Griff und einen Abzug aufweist, mit einem hiermit verbundenen Pistolenrohr mit einer Austrittsöffnung, die über einen Materialkanal mit einem vor dem Abzug angeordneten Materialanschluß und gegebenenfalls über einen Luftkanal mit einem Luftanschluß verbunden ist, sowie mit einem teilweise im Griff aufgenommenen Hochspannungssystem, das einen Hochspannungserzeuger und wenigstens eine Hochspannung führende Elektrode aufweist.The invention relates to an electrostatic spray gun for liquid or in particular powdery materials, with a gun body that has a handle and a trigger, with a gun tube connected to it with an outlet opening, which via a material channel with a material connection arranged in front of the trigger and optionally via an air duct is connected to an air connection, and to a high-voltage system which is partially held in the handle and has a high-voltage generator and at least one high-voltage electrode.

Bei einer bekannten Sprühpistole dieser Art (EP-OS 157 199) ist der gesamte Hochspannungserzeuger, dessen Aufbau nicht näher beschrieben ist, im Griff untergebracht. Zu diesem Zweck besitzt er einen Kunststoffmantel, der griffartig geformt ist und an seiner Rückseite den Luftanschluß und den ersten Abschnitt des Luftkanals aufweist. Der Materialanschluß befindet sich am vorderen Ende des Pistolenkörpers unmittelbar hinter einer Trennstelle. Das Pistolenrohr, daß durch eine Schraubverbindung am Pistolenkörper befestigt wird, weist mehrere Kanäle auf, nämlich einen mittleren Materialkanal und außerhalb davon je um 120° versetzt einen Kanal für Zerstäubungsluft, einen Kanal für Formluft und einen Kanal für ein Hochspannungkabel, daß zu der am Sprühkopf angeordneten Elektrode führt.In a known spray gun of this type (EP-OS 157 199), the entire high-voltage generator, the construction of which is not described in detail, is housed in the handle. For this purpose, it has a plastic jacket which is shaped like a handle and has the air connection and the first section of the air duct on its rear side. The material connection is on the front End of the gun body immediately behind a separation point. The gun tube, which is fastened to the gun body by a screw connection, has several channels, namely a central material channel and outside of it each offset by 120 °, a channel for atomizing air, a channel for shaped air and a channel for a high-voltage cable that to the spray head arranged electrode leads.

Auf diese Weise soll sich eine Sprühpistole ergeben, deren Schwerpunkt sich so weit hinten befindet, daß sie der Bedienungsperson gut in der Hand liegt. Allerdings erfordert diese Konstruktion eine erhebliche Miniaturisierung des Hochspannungserzeugers, wodurch dessen Leistungsfähigkeit begrenzt ist. Außerdem nimmt er fast den gesamten Querschnitt des Griffs ein. Wenn aber eine bestimmte Leistung erreicht werden muß oder wenn im Griff noch andere Funktionselemente untergebracht werden sollen, wird der Griff so groß, daß sich die Pistole nicht mehr bequem handhaben läßt.In this way, there should be a spray gun, the center of gravity is so far back that it lies well in the hand of the operator. However, this design requires considerable miniaturization of the high voltage generator, which limits its performance. It also takes up almost the entire cross-section of the handle. If, however, a certain performance has to be achieved or if other functional elements are to be accommodated in the handle, the handle becomes so large that the pistol can no longer be handled comfortably.

Der Erfindung liegt die Aufgabe zugrunde, eine elektrostatische Sprühpistole der eingangs beschriebenen Art anzugeben, die es unter weitgehender Beibehaltung der günstigen Schwerpunktslage ermöglicht, den Hochspannungserzeuger größer auszulegen oder weitere Funktionselemente in den Griff einzubeziehen, ohne daß der Griff zu große Abmessungen erhält.The invention has for its object to provide an electrostatic spray gun of the type described in the introduction, which makes it possible, while largely maintaining the favorable center of gravity, to design the high-voltage generator larger or to include other functional elements in the handle without the handle having too large dimensions.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Hochspannungserzeuger aus zwei Baugruppen besteht, von denen die eine Baugruppe am Griffrücken angeordnet ist, einen Oszillator und einen Transformator enthält und mit einem Niederspannungseingang versehen ist, und von denen die andere Baugruppe im Pistolenkörper zwischen dem Griff und dem Materialanschluß angeordnet ist, einen Spannungsvervielfacher enthält und mit einem Hochspannungsausgang versehen ist.This object is achieved in that the high voltage generator consists of two assemblies, one of which is arranged on the back of the handle, contains an oscillator and a transformer and is provided with a low voltage input, and of which the other assembly in the gun body between the handle and arranged the material connection is, contains a voltage multiplier and is provided with a high voltage output.

Bei dieser Konstruktion befindet sich der schwerste Teil des Hochspannungserzeugers, nämlich der Tranformator, weiterhin im Griff. Er ist aber so weit wie möglich nach hinten gerückt. Dies erlaubt es, die zweite Baugruppe, die die verhältnismäßig leichte Spannungsvervielfacherschaltung oder Kaskade aufnimmt, vor dem Abzug anzuordnen, ohne daß dadurch die Sprühpistole kopflastig werden müßte. Infolge der Lage der ersten Baugruppe steht im vorderen Teil des Griffs ausreichend Platz für weitere Funktionen zur Verfügung. Die Lage der zweiten Baugruppe hat den Vorteil, daß der Abstand zwischen dem Hochspannungsausgang und der Elektrode geringer, also die erforderliche Hochspannungsleitung kürzer ist.With this construction, the heaviest part of the high-voltage generator, namely the transformer, is still under control. But it has moved as far back as possible. This allows the second assembly, which accommodates the relatively light voltage multiplier circuit or cascade, to be arranged before the trigger, without the spray gun having to become top-heavy as a result. Due to the position of the first module, there is enough space in the front part of the handle for further functions. The position of the second module has the advantage that the distance between the high-voltage output and the electrode is smaller, that is, the required high-voltage line is shorter.

Mit Vorzug weist die erste Baugruppe ein Gehäuse auf, das in eine am Griffrücken vorgesehene Aussparung des Pistolenkörpers auswechselbar eingesetzt ist und mit seiner freiliegenden Rückwand die Griffrückseite bildet. Die erste Baugruppe nimmt daher die allerhinterste Lage ein, was die Schwerpunktsverhältnisse verbessert. Außerdem kann sie bequem ausgewechselt werden.The first assembly preferably has a housing which is interchangeably inserted in a recess in the gun body provided on the handle back and forms the rear of the handle with its exposed rear wall. The first assembly therefore occupies the very rearmost position, which improves the center of gravity. It can also be easily replaced.

Insbesondere besteht das Gehäuse aus Metall und ist geerdet. Dies ergibt eine erhöhte Sicherheit der Bedienungsperson. Denn deren Handballen liegt im Betrieb automatisch an dem Gehäuse an, so daß auch die Bedienungsperson geerdet ist. Das Metallgehäuse dient ferner als Kühlkörper zu Abfuhr der im Transformator erzeugten Wärme.In particular, the housing is made of metal and is grounded. This results in increased safety for the operator. Because the ball of your hand is automatically in contact with the housing during operation, so that the operator is also grounded. The metal housing also serves as a heat sink for dissipating the heat generated in the transformer.

Besonders günstig ist es, wenn das Gehäuse einen U-förmigen Querschnitt mit der Breite des Griffes hat. Hierdurch wird der gesamte hintere Abschnitt des Griffs durch das Gehäuse gebildet. Das Gehäuse hat eine verhältmäßig große Breite und kann daher entweder einen größeren Transformator aufnehmen oder, bei sonst gleichem Rauminhalt, eine geringere Tiefe erhalten.It is particularly favorable if the housing has a U-shaped cross section with the width of the handle. This will cover the entire rear section of the handle formed by the housing. The housing has a relatively large width and can therefore either accommodate a larger transformer or, with the same volume, otherwise have a smaller depth.

Es können nunmehr an der Vorderseite des Griffs weitere Funktionselemente vorgesehen werden. So kann der Griff an der Vorderseite eine Vertiefung aufweisen, in die der mit Seitenwänden versehene Abzug ständig eingreift. Es besteht daher keine Gefahr, daß irgendwelche Teile zwischen Abzug und Griff eingeklemmt werden. Außerdem sind die vom Abzug betätigten Elemente, beispielsweise ein Luftventil, geschützt.Additional functional elements can now be provided on the front of the handle. For example, the handle on the front can have a recess in which the trigger provided with side walls constantly engages. There is therefore no risk of any parts getting caught between the trigger and the handle. In addition, the elements actuated by the trigger, such as an air valve, are protected.

Desweiteren kann im vorderen Teil des Griffs unterhalb des Abzugs ein Schalter, insbesondere ein Näherungsschalter, angeordnet sein, der durch ein Steuerelement an der Unterseite des Abzugs betätigbar ist. Auf diese Weise kann der Schalter der ersten Baugruppe räumlich dicht benachbart zugeordnet werden.Furthermore, a switch, in particular a proximity switch, can be arranged in the front part of the handle below the trigger, which can be actuated by a control element on the underside of the trigger. In this way, the switch can be assigned to the first assembly in a spatially closely adjacent manner.

Vorzugsweise ist der Schalter in einer sich parallel zur Griffvorderseite erstreckenden Bohrung um einen Trennweg axial verlagerbar. Die Bedienungsperson kann daher den Schalter durch Axialverschiebung unwirksam machen. Da dies am Griff erfolgt, kann dieses Unwirksammachen mit der Hand erfolgen.The switch is preferably axially displaceable by a separation path in a bore extending parallel to the front of the handle. The operator can therefore disable the switch by axial displacement. Since this is done on the handle, this ineffectiveness can be done by hand.

Eine besonders günstige Ausführung ergibt sich, wenn der Schalter in einem Schieber untergebracht ist, der einen Radialarm trägt, welcher bei Drehung auf einer Kurve aufläuft und dadurch den Schieber gegen die Kraft einer Rückstellfeder in der Bohrung verlagert. Zum Unwirksammachen braucht dann lediglich mit dem kleinen Finger der Radialarm verschwenkt zu werden.A particularly favorable design results if the switch is accommodated in a slide which carries a radial arm which runs on a curve when rotating and thereby displaces the slide against the force of a return spring in the bore. To render it ineffective, the radial arm only needs to be pivoted with the little finger.

Ferner sollte der Schalter einpolig in die im Griff verlaufende Niederspannungszuleitung der ersten Baugruppe eingeschaltet sein. Es ergibt sich eine äußerst kurze Verbindungsleitung im Griff. Es genügt dann, ein einfaches Zuleitungskabel vorzusehen, das die Sprühpistole wenig belastet. Eine solche Einrichtung ist ohne weiteres für eine Flüssigkeitspistole mit Druckzerstäubung und vom Abzug betätigtem Luftventil geeignet. Sollte bei Betätigung des Abzugs noch eine weitere elektrische Einrichtung eingeschaltet werden, beispielsweise bei einer Pulverpistole die Pulverförderung, so kann dies mit Hilfe einer Stromabfrageschaltung geschehen, die den zum Hochspannungserzeuger fließenden Strom überwacht.Furthermore, the switch should be switched on with one pole in the low-voltage supply line of the first module running in the handle. The result is an extremely short connecting line in the handle. It is then sufficient to provide a simple supply cable that places little strain on the spray gun. Such a device is readily suitable for a liquid gun with pressure atomization and an air valve operated by the trigger. If another electrical device is switched on when the trigger is actuated, for example powder delivery in the case of a powder gun, this can be done with the aid of a current interrogation circuit which monitors the current flowing to the high-voltage generator.

Mit besonderem Vorteil ist der Pistolenkörper zwischen Griff und zweiter Baugruppe geteilt, und die zweite Baugruppe ist von der Teilungsebene her in den vorderen Pistolenkörperteil einsetzbar. Dies erlaubt es, auch die zweite Baugruppe ohne Schwierigkeiten auszutauschen.The gun body is particularly advantageously divided between the handle and the second assembly, and the second assembly can be inserted into the front gun body part from the division level. This allows the second assembly to be replaced without difficulty.

Besonders günstig ist es, wenn die wenigstens eine Elektrode im Pistolenkörper angeordnet und das Pistolenrohr hiervon trennbar ist. Dies führt einerseits zu einer Gewichtsersparnis und einer günstigen Lage des Schwerpunkts, weil sich die Elektrode in der Nähe des Hochspannungsausgangs befindet und kein bis zur Austrittsöffnung führendes Hochspannungskabel vorgesehen werden muß. Andererseits ist das Pistolenrohr frei von Teilen des Hochspannungssystems und kann daher leicht gereinigt werden. Denn bei der Reinigung kann weder die Hochspannungselektrode mechanisch beschädigt werden, noch können Teile des Hochspannungssystems durch Reinigungsmittel angegriffen werden. Da an der Trennstelle keine Hochspannungs-Kontaktverbindung vorhanden sein muß, braucht beim Zusammenfügen der Teile keine Drehwinkel-Ausrichtung beachtet zu werden.It is particularly expedient if the at least one electrode is arranged in the gun body and the gun tube can be separated therefrom. On the one hand, this leads to a saving in weight and a favorable position of the center of gravity, because the electrode is in the vicinity of the high-voltage output and no high-voltage cable leading to the outlet opening has to be provided. On the other hand, the gun barrel is free of parts of the high-voltage system and can therefore be cleaned easily. This is because cleaning can neither mechanically damage the high-voltage electrode, nor can parts of the high-voltage system be attacked by cleaning agents. Since there is no need for a high-voltage contact connection at the separation point no alignment of rotation angle to be considered when assembling the parts.

Daher ist es möglich, das Pistolenrohr an der Trennstelle in beliebiger Drehwinkellage steckbar mit dem Pistolenkörper zu verbinden. Und desweiteren kann in dem Pistolenrohr ein Luftrohr angeordet sein, das ebenfalls an der Trennstelle in beliebiger Drehwinkellage steckbar mit dem Pistolenkörper verbunden ist.It is therefore possible to connect the gun barrel to the gun body at any point at any point of rotation. And furthermore, an air tube can be arranged in the gun tube, which is also connected to the gun body in a pluggable manner at any point of rotation.

Wenn es sich um die Aufladung des Materials handelt, sollte sich die Elektrode in einem vom Materialanschluß ausgehenden Zulaufstutzen befinden. Hier ist sie auch gegen eine unerwünschte Berührung gesichert.If the material is being charged, the electrode should be located in an inlet connection from the material connection. Here it is also secured against unwanted touch.

Wenn es sich um die Luftaufladung handelt, sollte sich die Elektrode in einem die zweite Baugruppe durchsetzenden Luftkanal befinden. Auch hier ist die Elektrode vor Berührung geschützt.If it is an air charge, the electrode should be located in an air duct passing through the second assembly. The electrode is also protected against contact here.

Die mindestens eine Elektrode kann ferner so im Pistolenkörper angeordnet werden, daß nach einer Abnahme des Pistolenrohres bei einer versehentlichen Betätigung des Abzugs eine Bedienungsperson keinen Schlag erhalten kann und auch kein Funkenüberschlag erfolgt, der beispielsweise in einer Lösungsmittel-Atmosphäre zu einer Explosion führen könnte. Es ist lediglich dafür zu sorgen, daß der Abstand der wenigstens einen Elektrode von der Stirnseite der Trennstelle größer als die Funkenüberschlagsstrecke ist. In gleicher Weise sollte der Abstand der Elektrode im Materialkanal vom Materialanschluß und der Abstand der Elektrode im Luftkanal von einem in Griffnähe angeordneten Drosselventil größer sein als die Funkenüberschlagsstrecke.The at least one electrode can also be arranged in the gun body in such a way that after removal of the gun barrel in the event of an inadvertent actuation of the trigger, an operator cannot receive a blow and there is no sparkover which could lead to an explosion, for example, in a solvent atmosphere. It is only necessary to ensure that the distance of the at least one electrode from the end face of the separation point is greater than the sparkover gap. In the same way, the distance of the electrode in the material channel from the material connection and the distance of the electrode in the air channel from a throttle valve arranged near the handle should be greater than the sparkover gap.

Die Erfindung wird nachstehend anhand eines bevorzugten, in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

  • Fig. 1 einen Längsschnitt durch eine erfindungsgemäße Pulver-Sprühpistole und
  • Fig. 2 einen Querschnitt durch die erste Baugruppe entsprechend der Schnittlinie A-A der Fig. 1.
The invention is explained below with reference to a preferred embodiment shown in the drawing. Show it:
  • Fig. 1 shows a longitudinal section through a powder spray gun according to the invention and
  • 2 shows a cross section through the first assembly according to section line AA of FIG. 1st

Die veranschaulichte Pulver-Sprühpistole weist einen Pistolenkörper 1 und ein Pistolenrohr 2 auf, die an einer Trennstelle 3 längs einer Zylinderfläche 4 steckbar miteinander verbunden sind. Der Pistolenkörper 1 besitzt einen hinteren Teil 5 mit einem Griff 6 und einen über eine Teilungsebene 7 damit verbundenen vorderen Teil 8, an welchem ein Material-Zulaufstutzen 9 mit einem Materialanschluß 10 ausgebildet ist. An diesem Materialanschluß 10 ist eine Materialleitung 11 befestigt. Im Innern des Pistolenrohres ist ein Luftrohr 12 angeordnet, das an der Trennstelle 3 über eine Zylinderfläche 13 in beliebiger Drehwinkellage steckbar mit dem Pistolenkörper 1 verbunden ist. Dieses Luftrohr 12 ist vorn mit einem Prallkörper 14 versehen. Auf diese Weise ergibt sich zwischen dem Materialanschluß 10 und einer Austrittsöffnung 15 ein Materialkanal, dessen erster Abschnitt 16 im Zulaufstutzen verläuft und dessen zweiter Abschnitt-17 einen Ringquerschnitt hat und zwischen Pistolenrohr 2 und Luftrohr 12 angeordnet ist.The illustrated powder spray gun has a gun body 1 and a gun tube 2, which are connected to one another at a separation point 3 along a cylinder surface 4. The gun body 1 has a rear part 5 with a handle 6 and a front part 8 connected to it via a parting plane 7, on which a material inlet connection 9 with a material connection 10 is formed. A material line 11 is attached to this material connection 10. An air tube 12 is arranged in the interior of the gun tube and is connected to the gun body 1 at the separation point 3 via a cylindrical surface 13 in any rotational angle position. This air tube 12 is provided with an impact body 14 at the front. This results in a material channel between the material connection 10 and an outlet opening 15, the first section 16 of which extends in the inlet connection and the second section 17 has an annular cross section and is arranged between the gun tube 2 and the air tube 12.

Ein Luftanschluß 18 ist mit einer Luftleitung 19 verbunden. Von ihm geht ein erster Abschnitt 20 eines Luftkanals aus, der über ein ein- und ausschaltbares Luftventil 21 und ein einstellbares Luft-Drosselventil 22 zu einem zweiten Abschnitt 23 des Luftkanals führt, der zunächst im Pistolenkörper 1 und dann im Luftrohr 12 verläuft.An air connection 18 is connected to an air line 19. A first section 20 of an air duct extends from it, which leads via an air valve 21 that can be switched on and off and an adjustable air throttle valve 22 to a second section 23 of the air duct, which runs first in the gun body 1 and then in the air pipe 12.

Ein Hochspannungserzeuger besteht aus einer ersten Baugruppe 24 an der Rückseite des Griffs 6 und einer zweiten Baugruppe 25 im Pistolenkörper 1 zwischen dem Griff 6 und der Trennstelle 3. Die erste Baugruppe 24 weist einen Niederspannungseingang 26, der mit einer elektrischen Zuleitung 27 verbunden ist, einen Oszillator 28 und einen Transformator 29 auf, welche in einen isolierenden Kunststoff 30 eingebettet und von einem Gehäuse 31 aus Metall mit U-förmigem Querschnitt umgeben sind.A high-voltage generator consists of a first assembly 24 on the rear of the handle 6 and a second assembly 25 in the gun body 1 between the handle 6 and the separation point 3. The first assembly 24 has a low-voltage input 26, which is connected to an electrical supply line 27, one Oscillator 28 and a transformer 29, which are embedded in an insulating plastic 30 and surrounded by a housing 31 made of metal with a U-shaped cross section.

Dieses Gehäuse ist über eine Leitung 32 geerdet. Es ist in eine Vertiefung 33 des Griffs 6 eingesetzt, derart, daß seine Rückseite 34 freiliegt und von dem Handballen der Bedienungsperson im Betrieb umgriffen wird. Die beiden Seitenwände 35 und 36 des Gehäuses haben einen Abstand gleich der Griffbreite. Die gesamte Baugruppe 24 ist leicht auswechselbar in der Vertiefung 33 gehalten. Der Ausgang der ersten Baugruppe 24 ist über eine im Pistolenkörper 1 verlaufende Leitung 37 mit dem Eingang der zweiten Baugruppe 25 verbunden. Diese weist die üblichen Bestandteile einer Spannungsvervielfacherschaltung 38 auf, insbesondere eine Kaskade aus Kondensatoren und Gleichrichtern. Der Hochspannungsausgang 39 ist einerseits mit einer Elektrode 40 im ersten Abschnitt 16 des Materialkanals und andererseits mit einer Elektrode 41 in demjenigen Teil des zweiten Luftkanalabschnitts 23 angeordnet, der sich im Innern der zweiten Baugruppe 25 befindet. Wenn man den Pistolenkörper 1 in seine beiden Teile 5 und 8 zerlegt, kann die zweite Baugruppe von der Teilungsebene 7 her bequem ausgewechselt werden.This housing is grounded via a line 32. It is inserted into a recess 33 of the handle 6 in such a way that its rear side 34 is exposed and is gripped by the operator's palm in operation. The two side walls 35 and 36 of the housing have a distance equal to the grip width. The entire assembly 24 is held in the recess 33 in an easily replaceable manner. The output of the first assembly 24 is connected to the input of the second assembly 25 via a line 37 running in the gun body 1. This has the usual components of a voltage multiplier circuit 38, in particular a cascade of capacitors and rectifiers. The high-voltage output 39 is arranged on the one hand with an electrode 40 in the first section 16 of the material channel and on the other hand with an electrode 41 in that part of the second air channel section 23 which is located in the interior of the second assembly 25. If you dismantle the gun body 1 into its two parts 5 and 8, the second assembly can be easily replaced from the division level 7.

Das Luftventil 21 wird mit Hilfe eines Abzugs 42 betätigt, der um einen Drehpunkt 43 schwenkbar ist und Seitenwände 44 besitzt, welche bereits in der Ruhestellung in eine Vertiefung 45 an der Vorderseite des Griffes 6 eingreifen. Die Vertiefung ist ausreichend groß, daß der Abzug 42 den vollen Betätigungshub vollführen kann. Hierbei besteht keine Gefahr, daß irgendwelche Teile eingeklemmt werden. Der Abzug 42 kann beispielsweise aus Kunststoff gespritzt sein.The air valve 21 is actuated by means of a trigger 42, which is pivotable about a pivot point 43 and has side walls 44, which are already in the rest position engage in a recess 45 on the front of the handle 6. The recess is sufficiently large that the trigger 42 can perform the full actuation stroke. There is no risk of any parts getting caught. The trigger 42 can be injection molded from plastic, for example.

An der Unterseite des Abzugs 42 befindet sich ein Steuerelement 46, das einen ebenfalls im vorderen Griffteil befindlichen Schalter 47 zu betätigen gestattet. Im Ausführungsbeispiel handelt es sich um einen Näherungsschalter 47, der durch ein metallisches Steuerelement 56 betätigt wird. Es kann sich aber auch um einen Reed-Kontakt handeln, der durch einen Magneten betätigt wird. Der Schalter 47 ist über eine Leitung 47a einpolig in die Zuleitung zur ersten Baugruppe 24 eingeschaltet.On the underside of the trigger 42 there is a control element 46 which allows a switch 47 which is also located in the front handle part to be actuated. In the exemplary embodiment, it is a proximity switch 47, which is actuated by a metallic control element 56. But it can also be a reed contact that is actuated by a magnet. The switch 47 is switched on via a line 47a with one pole in the supply line to the first module 24.

Der Schalter 47 ist in einem zylindrischen Schieber 48 angeordnet, der sich in einer zylindrischen Bohrung 49 befindet. Der Schieber ist mit einem Radialarm 50 versehen, der beim Verschwenken um 90° auf einer Kurve 51 entlanggleitet und dabei den Schieber 48 gegen die Kraft einer Rückstellfeder 52 nach unten zieht. Hierdurch wird der Schalter 47 unwirksam. Er kann nicht mehr durch das Steuerelement 46 betätigt werden. Der Radialarm 50 kann von der Bedienungsperson mit dem kleinen Finger derjenigen Hand betätigt werden, die den Griff 6 hält.The switch 47 is arranged in a cylindrical slide 48 which is located in a cylindrical bore 49. The slide is provided with a radial arm 50 which slides along a curve 51 when pivoted through 90 ° and thereby pulls the slide 48 downward against the force of a return spring 52. As a result, the switch 47 becomes ineffective. It can no longer be operated by the control element 46. The radial arm 50 can be operated by the operator with the little finger of the hand holding the handle 6.

Die Elektrode 50 im Materialkanal hat vom Materialanschluß 11 einen Abstand A, der größer ist als die Funkenüberschlagsstrecke bei der gegebenen Hochspannung. Auch der Abstand B dieser Elektrode zur Stirnfläche 53 der Trennstelle 3 ist größer als diese Funkenüberschlagsstrecke. Dasselbe gilt für den Abstand der Elektrode 41 im Luftkanal zur Stirnfläche 53 und für den Abstand C dieser Elektrode zum Luft-Drosselventil 22.The electrode 50 in the material channel has a distance A from the material connection 11 which is greater than the sparkover gap at the given high voltage. The distance B of this electrode to the end face 53 of the separation point 3 is also greater than this sparkover gap. The same applies to the distance between the electrode 41 in the air duct and the end face 53 and for the distance C. this electrode to the air throttle valve 22.

Bei einer solchen Konstruktion ist der Schwerpunkt der Pistole annähernd im Griffbereich. Denn dem durch das Gewicht der vorderen Teile 2, 8 und 12 hervorgerufenen Drehmoment wird durch das Drehmoment entgegengewirkt, das durch das Gewicht der ersten Baugruppe 24, insbesondere des Transformators 29, hervorgerufen wird.With such a construction, the center of gravity of the pistol is approximately in the grip area. Because the torque caused by the weight of the front parts 2, 8 and 12 is counteracted by the torque caused by the weight of the first assembly 24, in particular the transformer 29.

Da das Pistolenrohr 2 und das Luftrohr 12 keinerlei Hochspannung führende Teile tragen, können sie leicht gereinigt werden. Der am Pistolenkörper verbleibende erste Abschnitt 16 des Materialkanals ist kurz und läßt sich mittels Durchblasen reinigen. Beim Wiederaufstecken der genannten Rohre ist keine besondere Drehwinkellage zu berücksichten. Das Stecken ermöglicht ein einfaches Abziehen und Zusammensetzen.Since the gun tube 2 and the air tube 12 do not carry any parts carrying high voltage, they can be cleaned easily. The first section 16 of the material channel remaining on the gun body is short and can be cleaned by blowing through it. When reinserting the pipes mentioned, no particular angle of rotation position has to be taken into account. The plug enables easy removal and assembly.

Die Sprühpistole ist leicht handhabbar, weil lediglich eine Materialleitung 11, eine Luftleitung 19 und eine elektrische Leitung 27 angeschlossen sein müssen und die beiden letztgenannten Leitungen an der Unterseite des Griffes angreifen.The spray gun is easy to handle because only a material line 11, an air line 19 and an electrical line 27 have to be connected and attack the latter two lines on the underside of the handle.

Es ist eine Pulver-Sprühpistole veranschaulicht. Das gleiche Prinzip kann aber auch auf Flüssigkeits-Sprühpistolen angewendet werden, wobei der Materialkanal zentrisch und der Luftkanal konzentrisch verläuft.A powder spray gun is illustrated. However, the same principle can also be applied to liquid spray guns, the material channel running centrally and the air channel concentrically.

Sollte für das Material noch eine besondere Fördervorrichtung vorgesehen sein, die bei Betätigung des Abzuges 42 in Tätigkeit treten soll, so kann man in an sich bekannter Weise in die Leitung 27 eine Stromabfragestufe einschalten, die beim Auftreten eines zum Hochspannungsgenerator 24 fließenden Stromes anspricht und dann eine Pumpe, ein Gebläse, ein Ventil o.dgl. zum Zweck der Materialförderung einschaltet.If a special conveying device is to be provided for the material, which is to come into operation when the trigger 42 is actuated, a current detection stage can be switched on in line 27, which responds when a current flowing to the high-voltage generator 24 occurs and then a pump, a blower, a valve or the like. turns on for the purpose of material handling.

Claims (18)

1. Elektrostatische Sprühpistole für flüssige oder insbesondere pulverförmige Materialien, mit einem Pistolenkörper, der einen Griff und einen Abzug aufweist, mit einem hiermit verbundenen Pistolenrohr mit einer Austrittsöffnung, die über einen Materialkanal mit einem vor dem Abzug angeordneten Materialanschluß und gegebenenfalls über einen Luftkanal mit einem Luftanschluß verbunden ist, sowie mit einem teilweise im Griff aufgenommenen Hochspannungssystem, das einen Hochspannungserzeuger und wenigstens eine Hochspannung führende Elektrode aufweist, dadurch gekennzeichnet, daß der Hochspannungserzeuger aus zwei Baugruppen (24, 25) besteht, von denen die eine Baugruppe (24) am Griffrücken angeordnet ist, einen Oszillator (28) und einen Transformator (29) enthält und mit einem Niederspannungseingang (26) versehen ist, und von denen die andere Baugruppe (25) im Pistolenkörper (1) zwischen dem Griff (6) und dem Materialanschluß (10) angeordnet ist, einen Spannungsvervielfacher (38) enthält und mit einem Hochspannungsausgang (39) versehen ist.1. Electrostatic spray gun for liquid or, in particular, powdery materials, with a gun body that has a handle and a trigger, with a gun tube connected to it with an outlet opening, which via a material channel with a material connection arranged in front of the trigger and optionally via an air channel with a Air connection is connected, as well as with a high-voltage system partially accommodated in the handle, which has a high-voltage generator and at least one high-voltage electrode, characterized in that the high-voltage generator consists of two assemblies (24, 25), one of which has an assembly (24) on the handle back is arranged, contains an oscillator (28) and a transformer (29) and is provided with a low voltage input (26), and of which the other assembly (25) in the gun body (1) between the handle (6) and the material connection (10 ) is arranged, contains a voltage multiplier (38) and is provided with a high voltage output (39). 2. Elektrostatische Sprühpistole nach Anspruch 1, dadurch gekennzeichnet, daß die erste Baugruppe (24) ein Gehäuse (31) aufweist, das in eine am Griffrücken vorgesehene Aussparung (33) des Pistolenkörpers (1) auswechselbar eingesetzt ist und mit seiner freiliegenden Rückwand (34) die Griffrückseite bildet.2. Electrostatic spray gun according to claim 1, characterized in that the first assembly (24) has a housing (31) which is interchangeably inserted in a recess provided on the handle back (33) of the gun body (1) and with its exposed rear wall (34 ) forms the back of the handle. 3. Elektrostatische Sprühpistole nach Anspruch 2, dadurch gekennzeichnet, daß das Gehäuse (31) aus Metall besteht und geerdet ist.3. Electrostatic spray gun according to claim 2, characterized in that the housing (31) consists of metal and is grounded. 4. Elektrostatische Sprühpistole nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß das Gehäuse (31) einen U-förmigen Querschnitt mit der Breite des Griffes (6) hat.4. Electrostatic spray gun according to claim 2 or 3, characterized in that the housing (31) has a U-shaped cross section with the width of the handle (6). 5. Elektrostatische Sprühpistole nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Griff an der Vorderseite eine Vertiefung (45) aufweist, in die der mit Seitenwänden (44) versehene Abzug (42) ständig eingreift.5. Electrostatic spray gun according to one of claims 1 to 4, characterized in that the handle on the front has a recess (45) into which the trigger (42) provided with side walls (44) constantly engages. 6. Elektrostatische Sprühpistole nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß im vorderen Teil des Griffs (6) unterhalb des Abzugs (42) ein Schalter (47), insbesondere ein Näherungsschalter, angeordnet ist, der durch ein Steuerelement (46) an der Unterseite des Abzugs betätigt ist.6. Electrostatic spray gun according to one of claims 1 to 5, characterized in that in the front part of the handle (6) below the trigger (42) a switch (47), in particular a proximity switch, is arranged, which is controlled by a control element (46) on the bottom of the trigger. 7. Elektrostatische Sprühpistole nach Anspruch 6, dadurch gekennzeichnet, daß der Schalter (47) in einer sich parallel zur Griffvorderseite erstreckenden Bohrung (49) um einen Trennweg axial verlagerbar ist.7. Electrostatic spray gun according to claim 6, characterized in that the switch (47) in an extending parallel to the handle front bore (49) is axially displaceable by a separation path. 8. Elektrostatische Sprühpistole nach Anspruch 7, dadurch gekennzeichnet, daß der Schalter (47) in einem Schieber (48) untergebracht ist, der einen Radialarm (50) trägt, welcher bei Drehung auf einer Kurve (51) aufläuft und dadurch den Schieber gegen die Kraft einer Rückstellfeder (52) in der Bohrung (49) verlagert.8. Electrostatic spray gun according to claim 7, characterized in that the switch (47) is housed in a slide (48) which carries a radial arm (50) which runs on rotation on a curve (51) and thereby the slide against the Force shifted by a return spring (52) in the bore (49). 9. Elektrostatische Sprühpistole nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß der Schalter (47) einpolig in die im Griff (6) verlaufende Niederspannungszuleitung der ersten Baugruppe (24) eingeschaltet ist.9. Electrostatic spray gun according to one of claims 6 to 8, characterized in that the switch (47) is switched on with one pole in the handle (6) running low voltage supply line of the first assembly (24). 10. Elektrostatische Sprühpistole nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß der Pistolenkörper (1) zwischen Griff (6) und zweiter Baugruppe (25) geteilt ist und die zweite Baugruppe von der Teilungsebene (7) her in den vorderen Pistolenkörperteil (8) einsetzbar ist.10. Electrostatic spray gun according to one of claims 1 to 9, characterized in that the gun body (1) between the handle (6) and the second assembly (25) is divided and the second assembly from the parting plane (7) into the front gun body part ( 8) can be used. 11. Elektrostatische Sprühpistole nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die wenigstens eine Elektrode (40, 41) im Pistolenkörper (1) angeordnet ist und das Pistolenrohr (2) hiervon trennbar ist.11. Electrostatic spray gun according to one of claims 1 to 10, characterized in that the at least one electrode (40, 41) is arranged in the gun body (1) and the gun tube (2) is separable therefrom. 12. Elektrostatische Sprühpistole nach Anspruch 11, dadurch gekennzeichnet, daß das Pistolenrohr (2) an der Trennstelle (3) in beliebiger Drehwinkellage steckbar mit dem Pistolenkörper (1) verbunden ist.12. Electrostatic spray gun according to claim 11, characterized in that the gun tube (2) at the separation point (3) is plugged into the gun body (1) in any rotational angle position. 13. Elektrostatische Sprühpistole nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß in dem Pistolenweg (2) ein Luftrohr (12) angeordnet ist, das ebenfalls an der Trennstelle (3) in beliebiger Drehwinkellage steckbar mit dem Pistolenkörper (1) verbunden ist.13. Electrostatic spray gun according to claim 11 or 12, characterized in that in the gun path (2) an air tube (12) is arranged, which is also plugged into the gun body (1) at the separation point (3) in any rotational angle position. 14. Elektrostatische Sprühpistole nach einem der Ansprüche 11 bis 13, dadurch gekennzeichnet, daß sich die Elektrode (40) in einem vom Materialanschluß (10) ausgehenden Zulaufstutzen (9) befindet.14. Electrostatic spray gun according to one of claims 11 to 13, characterized in that the electrode (40) is located in an inlet connection (9) starting from the material connection (10). 15. Elektrostatische Sprühpistole nach einem der Ansprüche 11 bis 14, dadurch gekennzeichnet, daß sich die Elektrode (41) in einem die zweite Baugruppe (25) durchsetzenden Luftkanal (23) befindet.15. Electrostatic spray gun according to one of claims 11 to 14, characterized in that the electrode (41) is in an air duct (23) penetrating the second assembly (25). 16. Elektrostatische Sprühpistole nach einem der Ansprüche 11 bis 15, dadurch gekennzeichnet, daß der Abstand (B) der wenigstens einen Elektrode (40, 41) von der Stirnseite (53) der Trennstelle (3) größer als die Funkenüberschlagsstrecke ist.16. Electrostatic spray gun according to one of claims 11 to 15, characterized in that the distance (B) of the at least one electrode (40, 41) from the end face (53) of the separation point (3) is greater than the sparkover gap. 17. Elektrostatische Sprühpistole nach einem der Ansprüche 11 bis 15, dadurch gekennzeichnet, daß der Abstand (A) der Elektrode (40) im Materialkanal vom Materialanschluß (10) größer als die Funkenüberschlagsstrecke ist.17. Electrostatic spray gun according to one of claims 11 to 15, characterized in that the distance (A) of the electrode (40) in the material channel from the material connection (10) is greater than the sparkover distance. 18. Elektrostatische Sprühpistole nach einem der Ansprüche 11 bis 17, dadurch gekennzeichnet, daß der Abstand (C) der Elektrode (41) im Luftkanal von einem in Griffnähe angeordneten Drosselventil (72) größer ist als die Funkenüberschlagsstrecke.18. Electrostatic spray gun according to one of claims 11 to 17, characterized in that the distance (C) of the electrode (41) in the air duct from a throttle valve (72) arranged in the vicinity of the handle is greater than the sparkover gap.
EP86117181A 1985-12-23 1986-12-10 Electrostatic spray gun Expired EP0227992B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117181T ATE46459T1 (en) 1985-12-23 1986-12-10 ELECTROSTATIC SPRAY GUN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3545885A DE3545885C1 (en) 1985-12-23 1985-12-23 Electrostatic spray gun
DE3545885 1985-12-23

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EP0227992A2 true EP0227992A2 (en) 1987-07-08
EP0227992A3 EP0227992A3 (en) 1987-12-09
EP0227992B1 EP0227992B1 (en) 1989-09-20

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US (1) US4752034A (en)
EP (1) EP0227992B1 (en)
JP (1) JPS62155955A (en)
AT (1) ATE46459T1 (en)
BR (1) BR8606378A (en)
DE (1) DE3545885C1 (en)
ES (1) ES2010660B3 (en)

Cited By (1)

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ES2010660B3 (en) 1989-12-01
BR8606378A (en) 1987-10-13
JPH0511510B2 (en) 1993-02-15
ATE46459T1 (en) 1989-10-15
EP0227992B1 (en) 1989-09-20
EP0227992A3 (en) 1987-12-09
JPS62155955A (en) 1987-07-10
DE3545885C1 (en) 1993-03-04
US4752034A (en) 1988-06-21

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