US3148831A - Electrostatic spraying apparatus - Google Patents

Electrostatic spraying apparatus Download PDF

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Publication number
US3148831A
US3148831A US145024A US14502461A US3148831A US 3148831 A US3148831 A US 3148831A US 145024 A US145024 A US 145024A US 14502461 A US14502461 A US 14502461A US 3148831 A US3148831 A US 3148831A
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Prior art keywords
barrel
tube
gun
bends
longitudinal axis
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US145024A
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Point Marcel Auguste Roger
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Machines Electrostatiques SA
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Sames Mach Electrostat
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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

  • the paint feed pipe located between the pistol grip and the nozzle which supplies this paint to the rotary head is generally straight or sometimes wound in a helix about the portion forming the barrel of the gun.
  • this pipe In order to avoid these difficulties it has already been proposed to lengthen this pipe by making it, at least over a portion of its length coiled in the form of a helix, preferably with continguous spirals, either about the barrel of the gun or about a separate support.
  • the paint feed pipe at least over a portion of its length, is made in the form of a sinuous tube the bends of which are arranged in the same plane, which allows this tube to be mounted on any suitable flat support.
  • the bends are arranged so as to form considerable and numerous interruptions in the final deposit of conductive metallic pigments, these interruptions being formed due to the presence in the tube of numerous nonhorizontal portions which are also as Vertical as possible and by avoiding horizontal portions.
  • FIGURE l shows an elevation partly in section of an electrostatic gun comprising a paint feed pipe according to the invention
  • FIGURE 2 is a transverse section of the barrel of this gun on the line 2-2 in FIGURE l, viewed in the direction of the arrows.
  • the gun comprises a butt 10 supporting at its rearward end a small electric motor 11 which can rotate an insulating driving shaft 12 located within the insulating barrel 13 of the gun at high speed.
  • the forward end of the shaft 12 is firmly secured by any suitable means to a rotary atomising head 14 of any known type.
  • FIGURE 2 shows the passage 22 in the barrel for the high voltage cable.
  • a trigger 15 with a return spring and an adjusting knob 16 has been shown in a diagrammatic way, said knob allowing the quantity of paint arriving at the end 17 of the paint feed pipe to be regulated.
  • the paint is projected into the head 14 by an injector or nozzle 18 which extends into this head without interfering with its rotation.
  • the paint feed pipe comprised between the part 17 and the injector 18 is constituted by an insulating sinuous tube 19, supported for example on insulating pegs such as 20 which are either firmly secured to the insulating barrel 13 or form an integral part thereof.
  • insulating pegs such as 20 which are either firmly secured to the insulating barrel 13 or form an integral part thereof.
  • all the curves or bends of the insulating tube 19 are arranged in the same plane against a ilat vertical surface of the barrel.
  • FIGURE l clearly shows that this tube comprises many non-horizontal portions which are as vertical as possible.
  • this tube is effected numerous and considerable interruptions in any deposit of metallic pigments at the low points in the spirals.
  • the increase in the length of the tube 19 as against a straight tube is relatively small, and much smaller than the lengthening which would result from the coiling of the tube in a helix about the barrel of the gun.
  • the sinuous tube 19 does not increase the volume of the barrel and only increases its weight to an insignificant degree, while bringing with it the advantages mentioned above.
  • An insulating protection cover 21 of any suitable type is fixed to the barrel 13 and helps to maintain the tube 19 in place in the barrel.
  • a hook 23 may be fixed to the butt 10 in order to hang the gun up when it is not being used.
  • the tube 19 has been shown in a substantially sinusoidal shape, but it is obvious that this tube can, for example, be in the form of crenellations, in Greek key patterns or again of a saw-tooth shape, or any other equivalent shape which causes considerable and numerous interruptions in any deposit of metallic pigments which may occur.
  • a spray gun for the electrostatic spraying of finely divided materials composed of conducting particles, such as metallic paints, and having a butt and a barrel, a paint feed pipe of electrically insulating material extending in a direction generally parallel to the longitudinal axis of said barrel and comprising a sinuous tube located within said barrel and having its bends all lying in a common plane which extends parallel to the longitudinal axis of said barrel and from top to bottom of said barrel whereby the bends of said tube are disposed in a substantially vertical plane when the gun is held in the position of use.
  • a spray gun as claimed in claim l including means for supporting said sinuous tube in position within the barrel of the gun.
  • An electrostatic spray gun for depositing on objects a nely pulverized electrically conducting fluid material, such as metallic paint, said spray gun having a barrel, a rotary spraying head mounted at one end of said barrel, a nozzle for delivering said material to the rotary head, and means for feeding said fluid material to said nozzle comprising a sinuous tube of electrically insulating material located within and extending longitudinally of said barrel and having its ben'ds all lying in the same plane which extends parallel to the longitudinal axis of said barrel and from rtop to bottom of said barrel whereby the 3 bends of said tube are disposed in a substantially vertical plane when the gun is held in the position of use.
  • a sinuous tube of electrically insulating material located within and extending longitudinally of said barrel and having its ben'ds all lying in the same plane which extends parallel to the longitudinal axis of said barrel and from rtop to bottom of said barrel whereby the 3 bends of said tube are disposed in a substantially vertical plane when the gun is held
  • a spray gun for the electrostatic spraying of finely divided materials composed of conducting particles, such as metallic paints, and having a butt and a barrel, a paint feed pipe of electrically insulating material extending in a direction generally parallel to the longitudinal axis of said barrel and comprising a sinuous tube located within said barrel and having its bends all lying in a common plane which extends parallel to the longitudinal axis of said barrel and from top to bottom of said barrel whereby the bends of ⁇ said tube are disposed in a substantially vertical plane when the gun is held in the position of use, and means for supporting said sinuous tube in position Within the barrel of the gun comprising a at surface extending longitudinally of the barrel of the gun and provided with a plurality of supports around which said sinuous tube successively passes so as to form the bends which have a large number of non-horizontal surfaces when the gun is held in the position of use.
  • An electrostatic spray gun for depositing on objects a finely pulverized electrically conducting fluid material
  • said spray gun having a barrel, a rotary spraying head mounted at one end of said barrel, a
  • said means for feeding said fluid material to said nozzle comprising a sinuous tube of electrically insulating material located Within and extending longitudinally of said barrel and having its bends all lying in the same plane which extends parallel to the longitudinal axis of said barrel, and supporting means for holding said sinuous insulating tube comprising a flat surface provided longitudinally Within the barrel of said gun and which is arranged s0 that said bends are disposed in a generally vertical plane when the gun is in its position for use.

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  • Electrostatic Spraying Apparatus (AREA)

Description

SePf- 15, 1964 M. A. R. POINT 3,148,831
ELEcTRosTATIc SPRAYING APPARATUSE Filed 0G13. 13, 1961 A ttarneyg,
United States Patent O 3,148,831 ELECTROSTATIC SPRAYING APPARATUS Marcel Auguste Roger Point, Grenoble, France, assignor to Societe Anonyme de Machines Electrostatiques, Grenoble, France, a French body corporate Filed Oct. 13, 1961, Ser. No. 145,024 Claims priority, application France Oct. 17, 1960 6 Claims. (Cl. 239-15) The present invention has for an object an improvement in rotary head electrostatic guns combining atomisation by centrifugal force and atomisation by electrostatic forces.
In previously known guns, the paint feed pipe located between the pistol grip and the nozzle which supplies this paint to the rotary head is generally straight or sometimes wound in a helix about the portion forming the barrel of the gun.
It has in fact been noted that with so-called metallic paints, i.e. paints containing metallic particles in suspension, a straight paint feed pipe could give rise to operational ditliculties caused by the electrical conductivity of the metallic pigments which become deposited in the bottom of the straight feed pipe.
In order to avoid these difficulties it has already been proposed to lengthen this pipe by making it, at least over a portion of its length coiled in the form of a helix, preferably with continguous spirals, either about the barrel of the gun or about a separate support.
It has now been found by tests that it is not so much the lengthening of the feed pipe which is effective in such a device, as the fact that the metallic pigments have a tendency to form a sediment at the lowest points in the spirals.
On the other hand the pipe or tube which is thus wound in a helix occupies a considerable volume and leads to a heavy and unwieldy apparatus.
In order to remedy these drawbacks and according to the present invention, the paint feed pipe, at least over a portion of its length, is made in the form of a sinuous tube the bends of which are arranged in the same plane, which allows this tube to be mounted on any suitable flat support.
Moreover, the bends are arranged so as to form considerable and numerous interruptions in the final deposit of conductive metallic pigments, these interruptions being formed due to the presence in the tube of numerous nonhorizontal portions which are also as Vertical as possible and by avoiding horizontal portions.
In order better to show the technical characteristics and advantages of the invention, a preferred embodiment will now be described, by way of example, with reference to the accompanying drawings, in which:
FIGURE l shows an elevation partly in section of an electrostatic gun comprising a paint feed pipe according to the invention, and
FIGURE 2 is a transverse section of the barrel of this gun on the line 2-2 in FIGURE l, viewed in the direction of the arrows.
Referring to the drawings, the gun comprises a butt 10 supporting at its rearward end a small electric motor 11 which can rotate an insulating driving shaft 12 located within the insulating barrel 13 of the gun at high speed. The forward end of the shaft 12 is firmly secured by any suitable means to a rotary atomising head 14 of any known type.
In order to simplify the drawing, the current conductors for the motor 11 have not been shown, nor has the high voltage cable connected to the head 14. These parts enter the lower portion of the butt 10. FIGURE 2 however shows the passage 22 in the barrel for the high voltage cable.
Patented Sept. 15, 1964 A trigger 15 with a return spring and an adjusting knob 16 has been shown in a diagrammatic way, said knob allowing the quantity of paint arriving at the end 17 of the paint feed pipe to be regulated. The paint is projected into the head 14 by an injector or nozzle 18 which extends into this head without interfering with its rotation.
According to the present invention, the paint feed pipe comprised between the part 17 and the injector 18 is constituted by an insulating sinuous tube 19, supported for example on insulating pegs such as 20 which are either firmly secured to the insulating barrel 13 or form an integral part thereof. As may easily be seen in FIGURE 2, all the curves or bends of the insulating tube 19 are arranged in the same plane against a ilat vertical surface of the barrel.
Furthermore FIGURE l clearly shows that this tube comprises many non-horizontal portions which are as vertical as possible. Thus, inside the tube are effected numerous and considerable interruptions in any deposit of metallic pigments at the low points in the spirals.
It may also be seen that the increase in the length of the tube 19 as against a straight tube is relatively small, and much smaller than the lengthening which would result from the coiling of the tube in a helix about the barrel of the gun. The sinuous tube 19 does not increase the volume of the barrel and only increases its weight to an insignificant degree, while bringing with it the advantages mentioned above.
An insulating protection cover 21 of any suitable type is fixed to the barrel 13 and helps to maintain the tube 19 in place in the barrel.
A hook 23 may be fixed to the butt 10 in order to hang the gun up when it is not being used.
Although only a preferred embodiment of the invention has been described and shown, it is obvious that detailed variations can be applied thereto without departing from its scope.
Thus for example the tube 19 has been shown in a substantially sinusoidal shape, but it is obvious that this tube can, for example, be in the form of crenellations, in Greek key patterns or again of a saw-tooth shape, or any other equivalent shape which causes considerable and numerous interruptions in any deposit of metallic pigments which may occur.
I claim:
l. A spray gun for the electrostatic spraying of finely divided materials composed of conducting particles, such as metallic paints, and having a butt and a barrel, a paint feed pipe of electrically insulating material extending in a direction generally parallel to the longitudinal axis of said barrel and comprising a sinuous tube located within said barrel and having its bends all lying in a common plane which extends parallel to the longitudinal axis of said barrel and from top to bottom of said barrel whereby the bends of said tube are disposed in a substantially vertical plane when the gun is held in the position of use.
2. A spray gun as claimed in claim l, including means for supporting said sinuous tube in position within the barrel of the gun.
3. A spray gun as claimed in claim 2, wherein said bends have a sinusoidal shape.
4. An electrostatic spray gun for depositing on objects a nely pulverized electrically conducting fluid material, such as metallic paint, said spray gun having a barrel, a rotary spraying head mounted at one end of said barrel, a nozzle for delivering said material to the rotary head, and means for feeding said fluid material to said nozzle comprising a sinuous tube of electrically insulating material located within and extending longitudinally of said barrel and having its ben'ds all lying in the same plane which extends parallel to the longitudinal axis of said barrel and from rtop to bottom of said barrel whereby the 3 bends of said tube are disposed in a substantially vertical plane when the gun is held in the position of use.
5. A spray gun for the electrostatic spraying of finely divided materials composed of conducting particles, such as metallic paints, and having a butt and a barrel, a paint feed pipe of electrically insulating material extending in a direction generally parallel to the longitudinal axis of said barrel and comprising a sinuous tube located within said barrel and having its bends all lying in a common plane which extends parallel to the longitudinal axis of said barrel and from top to bottom of said barrel whereby the bends of `said tube are disposed in a substantially vertical plane when the gun is held in the position of use, and means for supporting said sinuous tube in position Within the barrel of the gun comprising a at surface extending longitudinally of the barrel of the gun and provided with a plurality of supports around which said sinuous tube successively passes so as to form the bends which have a large number of non-horizontal surfaces when the gun is held in the position of use.
6. An electrostatic spray gun for depositing on objects a finely pulverized electrically conducting fluid material,
such as metallic paint, said spray gun having a barrel, a rotary spraying head mounted at one end of said barrel, a
nozzle for delivering said material to the rotary head,V
means for feeding said fluid material to said nozzle comprising a sinuous tube of electrically insulating material located Within and extending longitudinally of said barrel and having its bends all lying in the same plane which extends parallel to the longitudinal axis of said barrel, and supporting means for holding said sinuous insulating tube comprising a flat surface provided longitudinally Within the barrel of said gun and which is arranged s0 that said bends are disposed in a generally vertical plane when the gun is in its position for use.
References Cited in the file of this patent UNITED STATES PATENTS

Claims (1)

1. A SPRAY GUN FOR THE ELECTROSTATIC SPRAYING OF FINELY DIVIDED MATERIALS COMPOSED OF CONDUCTING PARTICLES, SUCH AS METALLIC PAINTS, AND HAVING A BUTT AND A BARREL, A PAINT FEED PIPE OF ELECTRICALLY INSULATING MATERIAL EXTENDING IN A DIRECTION GENERALLY PARALLEL TO THE LONGITUDINAL AXIS OF SAID BARREL AND COMPRISING A SINUOUS TUBE LOCATED WITHIN SAID BARREL AND HAVING ITS BENDS ALL LYING IN A COMMON PLANE WHICH EXTENDS PARALLEL TO THE LONGITUDINAL AXIS OF SAID BARREL AND FROM TOP TO BOTTOM OF SAID BARREL WHEREBY THE BENDS OF SAID TUBE ARE DISPOSED IN A SUBSTANTIALLY VERTICAL PLANE WHEN THE GUN IS HELD IN THE POSITION OF USE.
US145024A 1960-10-17 1961-10-13 Electrostatic spraying apparatus Expired - Lifetime US3148831A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR841366A FR1277332A (en) 1960-10-17 1960-10-17 Improvements to the paint supply tubes, particularly in electrostatic guns

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US3148831A true US3148831A (en) 1964-09-15

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US (1) US3148831A (en)
CH (1) CH376402A (en)
DE (1) DE1178333B (en)
FR (1) FR1277332A (en)
GB (1) GB971824A (en)
NL (1) NL269158A (en)
SE (1) SE197445C1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139155A (en) * 1977-05-25 1979-02-13 Nordson Corporation Electrostatic spray gun with isolating paint conduit
US4718920A (en) * 1986-04-18 1988-01-12 Midwest Research Institute Method and apparatus for smoke suppression

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE446826B (en) * 1981-04-24 1986-10-13 Icab Ind Coating Ab POWDER SPRAY WITH ELECTROSTATIC CHARGING FORM CONSISTING OF LONG-TERM CROCHET CHARGING CHANNELS WHICH ARE CROSSED TO IMAGE LOOP OR CARS ORGANIZED IN A MULTIPLE GROUPS
BR102017026883A2 (en) * 2017-12-13 2019-06-25 Tecnopampa Indústria De Máquinas Ltda PROLONGER ISOLATED FOR SPRAYING WITH ELECTROSTATIC ASSISTANCE

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1441982A (en) * 1920-02-04 1923-01-09 Frederick C Heylman Oil burner
US1946339A (en) * 1931-06-25 1934-02-06 Napier & Son Ltd Fuel injection device for internal combustion engines
US2732863A (en) * 1956-01-31 Sinusoidal fluid tube
US2739838A (en) * 1955-01-17 1956-03-27 Sedlacsik John Paint spray apparatus
US2926106A (en) * 1956-07-16 1960-02-23 Ransburg Electro Coating Corp Apparatus and methods for electrostatic coating utilizing an inner electrode to substantially reduce the central void of the annular spray pattern
US3056557A (en) * 1959-07-16 1962-10-02 Arvid C Walberg Spray gun for electrostatic coating

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732863A (en) * 1956-01-31 Sinusoidal fluid tube
US1441982A (en) * 1920-02-04 1923-01-09 Frederick C Heylman Oil burner
US1946339A (en) * 1931-06-25 1934-02-06 Napier & Son Ltd Fuel injection device for internal combustion engines
US2739838A (en) * 1955-01-17 1956-03-27 Sedlacsik John Paint spray apparatus
US2926106A (en) * 1956-07-16 1960-02-23 Ransburg Electro Coating Corp Apparatus and methods for electrostatic coating utilizing an inner electrode to substantially reduce the central void of the annular spray pattern
US3056557A (en) * 1959-07-16 1962-10-02 Arvid C Walberg Spray gun for electrostatic coating

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139155A (en) * 1977-05-25 1979-02-13 Nordson Corporation Electrostatic spray gun with isolating paint conduit
US4718920A (en) * 1986-04-18 1988-01-12 Midwest Research Institute Method and apparatus for smoke suppression

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GB971824A (en) 1964-10-07
CH376402A (en) 1964-03-31
SE197445C1 (en) 1965-07-27
FR1277332A (en) 1961-12-01
NL269158A (en)
DE1178333B (en) 1964-09-17

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