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
Authority
US
United States
Prior art keywords
barrel
tube
gun
bends
longitudinal axis
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.)
Expired - Lifetime
Application number
US145024A
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English (en)
Inventor
Point Marcel Auguste Roger
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.)
Machines Electrostatiques SA
Original Assignee
Sames Mach Electrostat
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sames Mach Electrostat filed Critical Sames Mach Electrostat
Application granted granted Critical
Publication of US3148831A publication Critical patent/US3148831A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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)
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 (fr) 1960-10-17 1960-10-17 Perfectionnements aux tubes d'amenée de peinture, notamment dans les pistolets électrostatiques

Publications (1)

Publication Number Publication Date
US3148831A true US3148831A (en) 1964-09-15

Family

ID=8740914

Family Applications (1)

Application Number Title Priority Date Filing Date
US145024A Expired - Lifetime US3148831A (en) 1960-10-17 1961-10-13 Electrostatic spraying apparatus

Country Status (7)

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

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 (sv) * 1981-04-24 1986-10-13 Icab Ind Coating Ab Pulverspruta med elektrostatisk laddningsformaga bestaende av langstreckta krokta laddningskanaler vilka krokts att bilda loopar eller vagor anordnade i ett flertal grupper
BR102017026883A2 (pt) * 2017-12-13 2019-06-25 Tecnopampa Indústria De Máquinas Ltda Prolongador isolado para pulverização com assistência eletrostática

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

Also Published As

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

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