US3009441A - Apparatus for electrostatically spray coating - Google Patents

Apparatus for electrostatically spray coating Download PDF

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Publication number
US3009441A
US3009441A US821319A US82131959A US3009441A US 3009441 A US3009441 A US 3009441A US 821319 A US821319 A US 821319A US 82131959 A US82131959 A US 82131959A US 3009441 A US3009441 A US 3009441A
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Prior art keywords
article
electrode
coating
atomizing
shield
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US821319A
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English (en)
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James W Juvinall
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Ransburg Corp
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Ransburg Corp
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Priority to US821319A priority Critical patent/US3009441A/en
Priority to FR830107A priority patent/FR1259849A/fr
Priority to CH693060A priority patent/CH370679A/fr
Priority to BE592009A priority patent/BE592009A/fr
Priority to DE1677171A priority patent/DE1677171C3/de
Priority to GB21535/60A priority patent/GB960102A/en
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Publication of US3009441A publication Critical patent/US3009441A/en
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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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces

Definitions

  • electrostatic coating systems the atomized particles of coating material are given an electrostatic charge, either at the time they are atomized or shortly thereafter, and deposition of many of the atomized particles on the article to be coated is primarily the result of electrostatic forces. Because of the fact that the article being coated, if metallic, may be used as one of the electrodes in the electrostatic coating field (or where the article is nonconduct-ive an electrode may be placed within or immediately behind the article) a very high coating efiiciency can be achieved and very little coating material is lost from over-spray.
  • previous electrostatic coating systems have included a relatively fixed atornizing means, and coating is achieved by moving the articles to be coated on a conveyor other other suitable mechanism within coating range of the fixed atomizer.
  • Such conveyors often employ means for rotating the articles as they move into the coating zone so as to facilitate deposition of coating material on all sides of the article.
  • a limited degree of movement is permitted the atomizing means, in the first case such movement being achieved mechanically and in the latter manually by an operator. In both instances, however, the range of movement of the atomizer is extremely limited and a conveyor system is still necessary.
  • One of the features of the present invention is the provision of a hand gun for use in an electrostatic coating system with the gun being so shielded as to permit it to be safely used by an operator for coating an article.
  • the gun of this invention is completely mobile and, where the article is too large to be carried on a mechanical conveyor system or for any reason a fixed atornizing means and attending conveyor is not desired, the gun can be hand-held and operated as the user walks around a large article applying coating thereto.
  • a further feature of the hand gun of the invention is the fact that the operator is adequately shielded from shock.
  • a mechanical barrier between the handle portion and the electrode of the gun may be in the form of a shield of insulating material which surrounds the electrode and extends outwardly therefrom to an open end which is intended to face the article being coated.
  • the shield and handl may be provided with an exterior metal coating which is grounded so that any current which leaks onto the exterior surface of the shield is disposed of by the conductive coating.
  • the electrode adjacent the source of atomized particles be maintained a distance from the other electrode of the field (which is normally the article) in excess of the maximum sparking distance of the electrodes.
  • This sparking distance is normally about one inch for each 20,000 volts of potential.
  • the spacing must exceed at least the maximum sparking distance, if the atomizing means and its attending electrode are fixed and the articles are moved along a conveyor, it is merely necessary initially to separate the electrodes suificiently to prevent sparking.
  • additional safeguards must be employed in order to prevent the operator from inadvertently moving the gun too close to the article.
  • Another feature of the present invention is the provision on an electrostatic coating gun of an insulating member which extends outwardly from the electrode a distance at least equal to the maximum sparking distance of the electrode so as to maintain at all times at least the minimum safe distance between electrodes.
  • an insulating member comprises the shield hereinabove referred to.
  • the coating material is atomized from a rotating bell-shaped head of the type disclosed in the copending application of E. M. Ransburg filed February 13, 1950, Serial No. 143,994, it has been found that the coating material is deposited on the article in an annular or doughnut-shaped pattern. If an unshielded head of this type is operated in particle depositing relationship to a fixed flat plate, coating material is deposited onthe plate in an annular pattern. In commercial use relative movement between the head and article serves to move the pattern across the article and thus to coat the entire surface. The coating thickness varies somewhat throughout the pattern with the minimum film thickness being about 50% of the maximum thickness.
  • FIG. 1 is a sectional view through one form of apparatus embodying the invention
  • FIG. 2 is a front elevation of the device shown in FIG. 1;
  • FIG. 3 is a view like FIG. 1 of a modified form of apparatus
  • FIG. 4 is a schematic view of another form of apparatus.
  • FIG. 5 is a view, partially in section, of the forward portion of the apparatus shown in FIG. 4.
  • the hand gun includes a housing 11 of insulating material such as a plastic, for example, polyethylene or polyester.
  • a wedge-type electrostatic atomizing unit 12 which includes an upper plate 13 which tapers to a relatively sharp edge 14 and a lower plate 15 similarly tapered to an edge 16.
  • the upper and lower plates are spaced by suitable shims so as to provide therebetween an elongated feed orifice 17 which extends the entire width of the plates.
  • Coating material is fed to the feed orifice under pressure through a conduit 18 of insulating material. such as rubber or plastic, which extends through a hollow 19 in a handle portion 20.
  • the handle is also of insulating material, preferably the same plastic as and cast integral with the housing 11.
  • the feed tube 18 connects with a fluid passage 21 connected in turn to a longitudinal passage 22 opening along its entire length to the feed orifice 17.
  • Suitable pressure producing means such as a pump (not shown) is provided for feeding coating material under pressure through the tube 18.
  • the unit 12 is supported in position by bolts 23 which engage collars 23:: secured to the unit and are threaded into a channel member 24 imbedded in the housing.
  • the electrostatic atomizing unit 12 is maintained at high potential relative to the article to be coated by means of a suitable Wire 25 connected at one end to the atomizer 12 and extending therefrom through the hollow 19 in the handle for connection to the hot terminal of a suitable power pack 26.
  • the opposite terminal of the power pack is grounded as indicated at 27.
  • the atomizing unit 12 is maintained at a high electrostatic potential suflicient to cause the coating material which is fed to the edges 14 and 16 to atomize therefrom in the form of finely divided discrete particles of coating material.
  • a potential providing an average field gradient of the order of 10,000 volts per inch for the intended distance of use.
  • the electrostatic field existing between the atomized particles and the article causes the deposition of such atomized particles onto the surface of the article.
  • the shield is also constructed of insulating material, such as polyethylene or polyester, and if desired the shield may be molded together with the housing and handle in a single operation integrally to connect such portion together.
  • the shield 30 flares outwardly from the atomizing means and terminates in an r opening 31 spaced forwardly of the atomizing means a distance approximately equal to the point to point sparking distance of the electrode.
  • the opening 3 1 is substantially rectangular in shape with the top side 31a and bottom side 31b paralleling the upper and lower plates 13 and 15.
  • the entire outer surface of the plastic shield is plated with a metallic coating 32. This coating is grounded as indicated at 33 so that the operator in grasping the gun is always in contact with the grounded handle. Because of this the operator cannot receive a shock and even if the insulating material should break down, an overload relay is provided in the power pack unit 26 so that the resulting increase in secondary current operates the relay to interrupt the electric power supplied to the atomizing unit.
  • the shield serves not only to protect the operator and to prevent too close approach of the electrode to the article, but also may serve as a field modifying member to produce desirable increases in coating uniformity.
  • the lines of force extend outwardly from the electrode and curve toward the article with the lines of force becoming progressively weaker toward the outer reaches of the field. Very weak lines of force are not efliective for causing the deposition of atomized coating material particles and may, for this purpose, be disregarded.
  • the shield may be constructed to compress all or parts of the effective depositing electrostatic field and by such compression modify the shape and density of the pattern of coating material particles deposited by such field.
  • the two sides of the opening normal to the length of the edge are closer to the edge than the other pair of sides.
  • the distance between the ends of the edge and the adjacent side normal thereto is less than the width at this point of an unrestricted electrostatic field originating at the edge and effective to cause the deposit-ion of atomized coating material particles.
  • these two sides serve to compress the field at the ends of the edge and produce a resulting pattern of deposited material which has a sharper cut off at its ends and thus there is less fanning out or thinning of the material at the ends of the pattern.
  • the shield may be constructed so that the other two sides which are parallel to the edge also serve to compress the field by reducing the width of the opening 31 between such sides to less than the diameter of an unrestricted effective electrostatic depositing field and thus narrow the width of the pattern deposited on a stationary target while simultaneously increasing the density and the uniformity of coating material deposited thereby.
  • FIG. 3 A somewhat modified form of construction is shown in FIG. 3. Referring to that fignlre there is provided a housing 40, a handle 41 integral with the housing and a cone-shaped shield 42 flaring outwardly from the housing and terminating in a substantially circular opening 43. Located within the housing is a rotatable bell type atomizing unit 44 of the type shown in the aforementioned Ransburg application Serial No. 143,994 which includes a bell-shaped head 45 provided with a central feed opening 46 with the head being carried by a shaft 47, rotatably mounted on anti-friction bearings 48, to be driven by a motor unit 49. The shaft 47 is hollow as indicated at 50 and receives coating material from fluid delivery tube 53 by means of opening 51 and chamber 52. The tube 53, which is made of insulating material, such as rubber, is in turn connected to a pump.
  • a rotatable bell type atomizing unit 44 of the type shown in the aforementioned Ransburg application Serial No. 143,994 which includes a bell-
  • Rotation of the shaft 47 and hence of the bell 45 is achieved through the motor unit 49, which may be of the hydraulic type shown or any other suitable form, and hydraulic fluid under pressure is supplied to and carried away from the motor by flexible tubes of insulating material such as tubes 55 and 55. Fluid fed to the tube 55 is directed to contact and drive the motor rotating vanes 56 by way of connecting passage 57.
  • the tubes 53, '55 and 55 extend through a hollow formed in the handle 41 as does an insulated wire 58 which is connected at one end to the motor unit 49, and thus, because of the metallic construction of that unit and the shaft 47 and the bell 45, to the atomizing unit 44, with the wire being connected at its opposite end to the hot terminal of a power pack 59, the other terminal of which is suitably grounded as indicated at 60.
  • the handle, housing and shield portion of the unit shown in FIG. 3 are, like that of the previous embodiment, provided on their exterior surfaces with a metallic coating suitably grounded as indicated at 71 for the purposes previously pointed out with reference to the embodiment of FIGS. 1 and 2.
  • the shield 42 surrounds the electrode on all sides as did the shield in the previous embodiment, the shield may also be constructed so as to compress the field and thus to appreciably increase the uniformity of deposition of coating material atomized from the atomizing means 44.
  • the diameter of the shield should be less than the diameter of the effective portions of an unrestricted electrostatic depositing field.
  • the pattern of an atomizing unit such as the unit 44 is annular in shape and when deposited on a moving target produces a pattern having a normal variation in coating thickness between areas of maximum and minimum coating of about 2 to 1. If, however, the diameter of the opening 43 in the shield is made less than the diameter of the portions of the electrostatic field effective to cause deposition of coating particles in an unrestricted field, such shield serves to compress the field and thereby to increase the uniformity in the pattern of deposited coating material particles so that the minimum coating thickness in the pattern is approximately 70% of the thickness of the maximum.
  • the shielding member shown and described herein may be used advantageously in electrostatic coating systems wherein the atomization takes place in quiescent air, that is where atomization occurs in the absence of a carrier air stream.
  • atomization occurs electrostatically, such as from the particular atomizing means heretofore described, there is little tendency for the atomized particles to impinge against the inner face of the shield not only because of the absence of a carrier air stream, but also because of the fact that the inner surface of the shield acquires an electrostatic charge by induction of a polarity similar to the charge on the paint particles; and since substantially all of the paint particles are given an electrostatic charge at the time of atomization, the charge on the insulating sheath repels the paint particles and thus maintains the interior surface thereof in a clean condition.
  • the metallic parts of the apparatus in both modifications be made as light as possible in order to reduce the over-all weight of the gun so that it may be manipulated with case.
  • the hydraulic motor be made largely of magnesium or aluminum and its size be reduced to a minimum.
  • FIGURE 4 A hand-held atomizing and charging device is illustrated schematically in FIGURE 4.
  • An elongated body portion 75 of insulating material is provided with a metal grip portion 76 and trigger means 77 for operating a valve which controls the flow of liquid coating material.
  • An annular atomizing member 78 is rotatably mounted at the forward end of the body 75.
  • This annular atomizing member is preferably of insulating material coated with a layer of material providing very slight conductivity, and having relatively high electrical resistance.
  • This rotating atomizing device is charged to a high voltage, as or kv., through a circuit having a high effective impedance, in this case provided by resistors 79 and 80 of the order of 500 megohms each.
  • the resistors are supplied with high voltage from a power supply 81 adapted to provide an output voltage of the order of kv., for example.
  • a power supply 81 adapted to provide an output voltage of the order of kv., for example.
  • an inner electrode 82 of insulating material coated with a high resistance but slightly conductive film. During operation, this is maintained at a voltage intermediate that of the atomizing device and ground by leakage current traveling from the annular atomizing member 78 to this inner electrode 82 and then through a voltage developing resistor 83, which may, for example, have a value of the order of 10,000 megohms.
  • a connection to ground from the resistor 83 is completed through the electric motor 84 which rotates the rotatable parts at the forward end of the device, the motor being grounded through the grounded metal grip 76.
  • the rotating annular atomizing member 78 has associated with it a very light and compact shield here identified as '85, and this shield and its relation to the other parts will now be more fully described.
  • the rotating atomizing member 78 is tapered on its inner surface to a relatively sharp outer edge 78a.
  • Liquid coating material supplied through the feed tube 86 flows in a thin film on the inner surface of the rotating member to the edge 78a where it is electrostatically atomized.
  • the high potential atomizing and charging field at this edge is created in part by the voltage differential between this edge and the grounded article being coated, and in part by the potential drop between this edge and the edge 82a of the inner counter-electrode.
  • Potential is delivered to the high resistance (but slightly conductive) coating on the outer surface of the atomizing member 78 by a small metal finger or brush 87 which makes contact with this conductive film during rotation of the member.
  • the shield 85 is here shown as carried by and rotating with the annular atomizing member 78, preferably being a push-fit thereon. It is made of good high-voltage insulating material, preferably flexible, as for example, of polyethylene.
  • the forward portion 85a of the shield may be relatively close to the atomizing edge, and need project but little forwardly of the edge. It is my belief that the presence of the inner counter-electrode provided by the member 82 permits the shield to be brought very close to the atomizing edge Without detracting from the quality of the electrostatic atomization; but whatever the reason may be, I find that in the type of hand-held atomizing device here illustrated, the shield may be within a half inch of the atomizing edge. The shield here shown still exerts a very desirable compressing effect on the exterior diameter of the pattern, and minimizes the thin fringe of somewhat drier spray particles which would otherwise surround the desirable portion of the spray pattern, without in any way detracting from the quality of atomization.
  • the shield 85 particularly in combination with an atomizing and charging device of the general character of that here last illustrated and described, provides good mechanical protection, desirable reduction in external diameter of the pattern without reducing the quality of the electrostatic atomization, and shields the brush connection in a manner improving transfer of voltage to the atomizing edge.
  • a hand gun for an electrostatic coating system comprising a housing of insulating material, an atomizing means secured to the housing, means for supplying liquid coating material to said means for atomization therefrom, means for creating an electrostatic field for causing the deposition of atomized particles on an article to be coated and including an electrode secured to the housing, a cup shaped shield of insulating material secured to the housing and having a rear closed portion enclosing the electrode and the atomizing means, said shield being flared outwardly from the rear portion and terminating in an opening spaced forwardly of the electrode a distance at least equal to the maximum sparking distance of the electrode, with said opening having a diameter less than the normal diameter of an unrestricted electrostatic field at the spacing of the opening from the electrode, a handle of insulating material secured to the housing, a thin layer of conducting material covering the exterior surface of the shield, housing and handle, and means for grounding said layer.
  • a hand gun for an electrostatic coating system comprising a housing of insulating material, a shaft rotatably supported in the housing, a bell-shaped atomizer secured to the shaft and positioned exteriorly of the housing, means for supplying liquid coating material to the interior surface of the atomizer, a cone-shaped shield of insulating material secured to and flaring outwardly from the housing and terminating in an edge of insulating material with the axis of the shield being coincident with the axis of rotation of the atomizer, means for rotating the shaft to rotate the atomizer, means for maintaining the edge of the atomizer at a high electrostatic potential relative to an article to be coated to create an electrostatic field therebetween for causing the deposition of atomized particles on the article, and a handle of insulating material secured to the housing.
  • An atomizing gun for an electrostatic coating system comprising an atomizing means, means for supplying liquid coating material to said atomizing means, means for maintaining said atomizing means at a high electric potential electrostatically to atomize coating material therefrom and for creating an electrostatic field between said atomizing means and an article to be coated effective to cause the deposition of atomized particles thereon, and a member of insulating material having a rear closed portion enclosing the atomizing means and said member flaring outwardly and forwardly therefrom to an opening in said member with said opening having a diameter less than the normal diameter of an unrestricted effective electrostatic field at the spacing of the opening from the atomizing means.
  • a support means on the support for forming and projecting a spray of electrically charged, finely divided particles of liquid coating material, said means including an electrode, means comprising a high-voltage source for maintaining the electrode at a different potential from the article, and a spacing member of insulating material on the support disposed exteriorly of the path of the spray and extending forwardly of the electrode in the direction of spray projection to be engageable with the article, said spacing member so extending from the electrode for a distance greater than the sparking distance at the potential difference existing between the article and electrode and having the general form of a hollow cone flaring from the electrode in the direction of spray-projection.
  • a support means on the support for forming and projecting a spray of electrically charged, finely divided particles of liquid coating material, said means including an electrode, means comprising a high-voltage source for maintaining the electrode at a different potential from the article, a spacing member of insulating material on the support disposed exteriorly of the path of the spray and extending forwardly of the electrode in the direction of spray projection to be engageable with the article, said spacing member so extending from the electrode for a distance greater than the sparking distance at the potential difference existing between the article and electrode, and having the form of a hollow spray-surrounding sleeve, and a shield of electroconductive material surrounding said sleeve.
  • means for forming and projecting a spray of electrically charged coating material particles said means having a handle, being manually movable as a unit relative to the article and including an electrode, a high-voltage source for maintaining a potential difference between the electrode and the article, and a member of insulating material supported by said handle, disposed exteriorly of the path of the spray, and extending forwardly of the electrode along the path of the spray for a distance greater than the sparking distance at the potential difference maintained between the electrode and article and having the general form of a hollow cone flaring from the electrode in the direction of spray-projection.
  • means for forming and projecting a spray of electrically charged coating material particles said means having a handle, being manually movable as a unit relative to the article and including an electrode, a high-voltage source for maintaining a potential difference between the electrode and the article, and a member of insulating material supported by said handle, disposed exteriorly of the path of the spray, and extending forwardly of the electrode along the path of the spray for a distance greater than the sparking distance at the potential difference maintained between the electrode and article, said member having the general form of a hollow cone flaring from the electrode in the direction of spray-projection and including a portion interposed between said handle and the electrode.
  • means for forming and projecting a spray of electrically charged coating material particles said means having a handle, being manually movable as a unit relative to the article and including an electrode, a high-voltage source for maintaining a potential difference between the electrode and the article, and a spray-surrounding shield of insulating material supported by said handle, extending forwardly from the electrode in the direction of sprayprojection for a distance greater than the sparking distance at the potential difference maintained between the electrode and article, and capable in operation of the apparatus of acquiring a surface charge which, throughout the region between the electrode and the forward end of the shield, exercises a particle-repelling elfect which is substantially uniform circumferentially of the spray.
  • means including an annular atomizer for forming and projecting toward the article an annular spray of elec trically charged coating material particles, means including a high-voltage source for maintaining a difference of potential between said atomizer and the article, and means comprising a member of insulating material surrounding and spaced outwardly from the spray at a point spaced from the atomizer in the direction of spray-projection whereby said member acquires by induction a surface charge for maintaining an annular spraysurrounding zone 9 of particle-repelling potential to reduce the diameter of the pattern of the annular spray.
  • means for forming and projecting a spray of electrically charged coating material particles said means being manually movable as a unit relative to the article and including a rotating atomizing member of low effective capacity having an annular atomizing edge, means for completing a high voltage circuit between said article and atomizing edge and including a stationary connector making rubbing contact with said rotating member, the high voltage circuit including high efiective impedance, and a shield of insulating material mounted on said first mentioned means and surrounding said atomizing edge and said connector.
  • Apparatus of the character claimed in claim 10 including a counter-electrode within said atomizing edge.
  • means for forming and projecting a spray of electrically charged coating material particles said means being manually movable as a unit relative to the article and including an electrode, a high voltage source for maintaining a particle-charging potential on the electrode, and a shield of insulating material mounted on said means and having an edge of insulating material surrounding said electrode.
  • an atomizing device having an annular atomizing edge for projecting generally axially thereof a spray of charged liquid coating material particles in an annular pattern toward the article, means for maintaining said device at a high electrical potential relative to the article, and a shielding device of insulating material mounted on said device immediately rearwardly of said edge and extending forwardly thereof and exteriorly of the spray.
  • a rotating atomizing device having an annular atomizing edge for projecting generally axially thereof a spray of charged liquid coating material particles in an annular pattern toward the article, means for maintaining said device at a high electrical potential, relative to the article, and an annular device of insulating material mounted on said atomizer rearwardly of the spray source and extending forwardly thereof sufficiently to electrostatically effect the path of at least some of the spray but not sutficiently to extend into the path of the spray.
  • means for forming and projecting a spray of electrically charged coating material particles said means having a handle, being manually movable as a unit relative to the article and including an electrode, a highvoltage source for maintaining a potential dilference 'between the electrode and the article, and a member of insulating material supported by said handle, disposed exteriorly of the path of the spray, and extending forwardly of the electrode along the path of the spray for a distance greater than the sparking distance at the potential difference maintained between the electrode and article.

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  • Electrostatic Spraying Apparatus (AREA)
US821319A 1959-06-18 1959-06-18 Apparatus for electrostatically spray coating Expired - Lifetime US3009441A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US821319A US3009441A (en) 1959-06-18 1959-06-18 Apparatus for electrostatically spray coating
FR830107A FR1259849A (fr) 1959-06-18 1960-06-15 Appareil d'enduisage par pulvérisation électrostatique
CH693060A CH370679A (fr) 1959-06-18 1960-06-17 Installation pour appliquer à des objets, par voie électrostatique, une matière de revêtement liquide
BE592009A BE592009A (fr) 1959-06-18 1960-06-17 Appareil d'enduisage par pulvérisation électrostatique.
DE1677171A DE1677171C3 (de) 1959-06-18 1960-06-18 Elektrostatische, vorzugsweise von Hand zu betätigende Vorrichtung zum Aufstäuben von Überzügen auf Werkstücke
GB21535/60A GB960102A (en) 1959-06-18 1960-06-20 Improvements in and relating to apparatus for electrostatically spray coating

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US821319A US3009441A (en) 1959-06-18 1959-06-18 Apparatus for electrostatically spray coating

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US3009441A true US3009441A (en) 1961-11-21

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US (1) US3009441A (de)
BE (1) BE592009A (de)
CH (1) CH370679A (de)
DE (1) DE1677171C3 (de)
GB (1) GB960102A (de)

Cited By (16)

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US3178114A (en) * 1960-11-02 1965-04-13 Sames Mach Electrostat Rotary atomising heads for electrostatic spray guns
US3613993A (en) * 1968-10-28 1971-10-19 Gourdine Systems Inc Electrostatic painting method and apparatus
US4739935A (en) * 1986-03-12 1988-04-26 Nordson Corporation Flexible voltage cable for electrostatic spray gun
US4986471A (en) * 1989-07-03 1991-01-22 General Dynamics Corp., Air Defense Systems Div. Remote indicator light and safety shield for electrostatic spray gun
US5346139A (en) * 1992-12-03 1994-09-13 Nordson Corp. Transfer of electrostatic charge through a turbine drive shaft to a rotary atomizer head
US5474236A (en) * 1992-12-03 1995-12-12 Nordson Corporation Transfer of electrostatic charge to a rotary atomizer head through the housing of a rotary atomizing spray device
US5490633A (en) * 1991-03-01 1996-02-13 Imperial Chemical Industries Plc Apparatus for ligament made electrostatic spraying
US5775598A (en) * 1995-04-06 1998-07-07 Abb Industry K.K. Rotary atomizing head type coating machine
US5788165A (en) * 1996-02-16 1998-08-04 Toyota Jidosha Kabushiki Kaisha Rotary atomizing head of a rotary atomizing electrostatic coating apparatus
US5865380A (en) * 1995-11-09 1999-02-02 Nissan Motor Co., Ltd. Rotary atomizing electrostatic coating apparatus
US6322011B1 (en) 2000-03-14 2001-11-27 Illinois Tool Works Inc. Electrostatic coating system and dual lip bell cup therefor
US6739529B2 (en) * 1999-08-06 2004-05-25 Cold Jet, Inc. Non-metallic particle blasting nozzle with static field dissipation
US20100193602A1 (en) * 2007-04-23 2010-08-05 Patrick Ballu Spraying member, spraying device comprising such a member, spraying installation and method of cleaning such a member
US20110220016A1 (en) * 2008-05-09 2011-09-15 Fabian Santiago Overspray shield devices suitable for use with material application apparatus
US20120006915A1 (en) * 2009-03-26 2012-01-12 Panasonic Electric Works Co., Ltd. Electrostatic atomization apparatus
US20130181074A1 (en) * 2010-09-27 2013-07-18 Toyota Jidosha Kabushiki Kaisha Electrostatic coating gun

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ZA791659B (en) * 1978-04-17 1980-04-30 Ici Ltd Process and apparatus for spraying liquid
DE3026241C2 (de) * 1980-07-10 1985-03-21 Ernst Roederstein Spezialfabrik für Kondensatoren GmbH, 8300 Landshut Handgerät zum elektrostatischen Beflocken von Gegenständen
GB8305865D0 (en) * 1983-03-03 1983-04-07 British Res Agricult Eng Electrostatic sprayers
DE3429075A1 (de) * 1984-08-07 1986-02-20 Hermann Behr & Sohn Gmbh & Co, 7121 Ingersheim Vorrichtung zum elektrostatischen beschichten von gegenstaenden
US7055768B1 (en) 1997-05-23 2006-06-06 John David Stratton Rotary device for transmission of material in particulate form
DE19721615A1 (de) * 1997-05-23 1998-12-10 R D T Advanced Painting Techno Vorrichtung mit mindestens einem rotierbar gelagerten Hohlkörper

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US1788600A (en) * 1924-02-07 1931-01-13 James S Smyser Abrasive article and manufacture of same
US2302289A (en) * 1938-12-06 1942-11-17 Union Oil Co Electrified spray method and apparatus
US2658009A (en) * 1948-05-13 1953-11-03 Ransburg Electro Coating Corp Electrostatic coating method and apparatus

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US1788600A (en) * 1924-02-07 1931-01-13 James S Smyser Abrasive article and manufacture of same
US2302289A (en) * 1938-12-06 1942-11-17 Union Oil Co Electrified spray method and apparatus
US2658009A (en) * 1948-05-13 1953-11-03 Ransburg Electro Coating Corp Electrostatic coating method and apparatus

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3178114A (en) * 1960-11-02 1965-04-13 Sames Mach Electrostat Rotary atomising heads for electrostatic spray guns
US3613993A (en) * 1968-10-28 1971-10-19 Gourdine Systems Inc Electrostatic painting method and apparatus
US4739935A (en) * 1986-03-12 1988-04-26 Nordson Corporation Flexible voltage cable for electrostatic spray gun
US4986471A (en) * 1989-07-03 1991-01-22 General Dynamics Corp., Air Defense Systems Div. Remote indicator light and safety shield for electrostatic spray gun
US5490633A (en) * 1991-03-01 1996-02-13 Imperial Chemical Industries Plc Apparatus for ligament made electrostatic spraying
US5346139A (en) * 1992-12-03 1994-09-13 Nordson Corp. Transfer of electrostatic charge through a turbine drive shaft to a rotary atomizer head
US5474236A (en) * 1992-12-03 1995-12-12 Nordson Corporation Transfer of electrostatic charge to a rotary atomizer head through the housing of a rotary atomizing spray device
US5775598A (en) * 1995-04-06 1998-07-07 Abb Industry K.K. Rotary atomizing head type coating machine
US5865380A (en) * 1995-11-09 1999-02-02 Nissan Motor Co., Ltd. Rotary atomizing electrostatic coating apparatus
US5788165A (en) * 1996-02-16 1998-08-04 Toyota Jidosha Kabushiki Kaisha Rotary atomizing head of a rotary atomizing electrostatic coating apparatus
US6739529B2 (en) * 1999-08-06 2004-05-25 Cold Jet, Inc. Non-metallic particle blasting nozzle with static field dissipation
US6322011B1 (en) 2000-03-14 2001-11-27 Illinois Tool Works Inc. Electrostatic coating system and dual lip bell cup therefor
EP1134026A3 (de) * 2000-03-14 2002-12-11 Illinois Tool Works Inc. Elektrostatisches Beschichtungssystem und Sprühglocke mit zwei Kanten
US20100193602A1 (en) * 2007-04-23 2010-08-05 Patrick Ballu Spraying member, spraying device comprising such a member, spraying installation and method of cleaning such a member
US8905325B2 (en) * 2007-04-23 2014-12-09 Sames Technologies Spraying member, spraying device comprising such a member, spraying installation and method of cleaning such a member
US20110220016A1 (en) * 2008-05-09 2011-09-15 Fabian Santiago Overspray shield devices suitable for use with material application apparatus
US20120006915A1 (en) * 2009-03-26 2012-01-12 Panasonic Electric Works Co., Ltd. Electrostatic atomization apparatus
US20130181074A1 (en) * 2010-09-27 2013-07-18 Toyota Jidosha Kabushiki Kaisha Electrostatic coating gun
US9061292B2 (en) * 2010-09-27 2015-06-23 Toyota Jidosha Kabushiki Kaisha Electrostatic coating gun

Also Published As

Publication number Publication date
DE1677171B2 (de) 1974-01-03
GB960102A (en) 1964-06-10
DE1677171A1 (de) 1970-03-05
BE592009A (fr) 1960-12-19
CH370679A (fr) 1963-07-15
DE1677171C3 (de) 1974-07-25

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