US3075706A - Gun for atomization and electrostatic spraying of materials - Google Patents

Gun for atomization and electrostatic spraying of materials Download PDF

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Publication number
US3075706A
US3075706A US27875A US2787560A US3075706A US 3075706 A US3075706 A US 3075706A US 27875 A US27875 A US 27875A US 2787560 A US2787560 A US 2787560A US 3075706 A US3075706 A US 3075706A
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US
United States
Prior art keywords
gun
coating material
edge
head
spraying
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
US27875A
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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 US3075706A publication Critical patent/US3075706A/en
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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
    • B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
    • B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
    • 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
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes

Definitions

  • the present invention relates to guns, particularly for hand use, for the atomization and electrostatic spraying of liquids, especially for spraying of materials which are electrically conductive, such as metallised paints or water paints.
  • the invention has for its object to provide an improved gun having a head by means of which the paint is submitted to a double atomization due to two cooperating members.
  • the gun comprises a handle 1 to which is fixed in any appropriate manner an elongated body 2 of insulating material.
  • a pipe 3 for the supply of paint under a pressure which has its outlet in a central rotating head member 4 of any convenient type having an atomization edge 4a, which head member can be of conducting, high resistivity or insulating material;
  • a high tension cable 5 connected, preferably through an electric protective resistance 6, to an electrode 7 which is fixed at the end of an extension Zn on the body 2;
  • a low tension cable 8 for supplying current to an electric motor 9 which is fixed to the gun.
  • the handle also comprises a trigger it operable by the user, which is associated with a rod 11 by means of which it can control a valve 12 connected in the paint supply pipe 3 and a switch 13 connected in the cable 8 in the circuit of the motor 9*.
  • the motor 9 drives the central head member 4 by means of an insulating shaft 14 having an extension rod 14a which passes through the end wall of the body 2 and is fixed to the hub portion 41) of the central head member 4.
  • An insulating support 15 is fixed to the outer surface of the head member 4 in a manner such that it does not cover the tapering atomizing edge 4a of the head member.
  • To the outer surface of the support 15 is fixed the internal surface of an outer electrostatic head member 16, care again being taken that the tapering atomizing edge 16a of the head member remains free.
  • the head member 16 is made of metal or semi-conducting high resistivity material.
  • the radial dimensions of the support 15 and of the outer head member 16 are such that the rear edge of the head member 16 faces and is spaced a very short distance away from the electrode 7.
  • the electrode 7 can be constituted as a spring-pressed contact adapted to engage the head 16.
  • the motor 9 rotates the two head members 4 and 16 simultaneously, the paint being delivered to the central head member 4 and the high tension being applied to the outer head member 16.
  • the paint may be delivered into an annular groove at the rear of the head member 4 and pass to the front part of this head member through apertures do in the hub 4b of the head member 4.
  • Paint supplied to the central head member 4 is submit- .ted to a first atomization (or distribution) due to the centrifugal force and the electric field existing between the two head members. Attracted by the outer head hfilhflhh Patented Jan. 29, 1%53 member 16, the paint becomes deposited thereon.
  • the potential of the central head member 4 is determined by the resistance of the column of paint. Thus with an electrically conducting paint this potential can be approximately earth potential. It is pointed out that this potential only exists during operation of the gun, that is when the head member 4 is electrically connected to the column of paint being supplied to it, and that this head member is electrically connected to the outer head member 16 by the atomized particles of material which are projected by the head member 4 on to the head member 16.
  • the two head members 4- and 16 rotate simultaneously in the same direction and at the same speed
  • the two head members can rotate in opposite directions and, if desired, at diflferent speeds. It sufiices mechanically to connect the two head members by means of pinions and appropriate gear wheels, subject to the condition that these gears maintain the electric insulation of the two head members in the same manner as the part 15.
  • Each head member can alternatively be driven by a separate motor if this is advantageous in any particular application.
  • the gun according to this invention may be constructed for fixing in position in a paint spraying machine.
  • a spray gun for centrifugally and electrostatically atomizing and spraying a liquid coating material on to an object to be coated comprising a head having an inner rotatable electrically conducting member for effecting an initial atomization of the coating material by means of centrifugal force and including an edge by means of which the initially atomized coating material leaves said inner member, an outer electrostatic atomizing and spraying member to which the coating material leaving the edge of the inner member is attracted and including an edge which is radially spaced from the edge of the inner rotatable member and from which the eleotrostatically atomized particles of coating material are directed on to the object to be spray-coated, an insulating member for coaxially and mechanically interconnecting said inner and said outer members, means for applying a direct high potential to said outer electrostatic member, means for feeding liquid covering material to said inner member, and an electric motor fixed to said gun for rotating at least the inner member of said head.
  • outer electrostatic member comprises an active atomizing and spraying edge situated in front of the plane of the edge of the inner rotating member and also in front of the plane containing said insulating member.
  • a spray gun for centrifugally and electrostatically atomizing and spraying a liquid coating material on to an object to be coated comprising a head having an inner rotatable electrically conducting member of generally cylindrical shape for effecting an initial atomization of the coating material by means of centrifugal force and including an edge by means of which the initially atomized coating material leaves said inner member, an outer generally cylindrically electrostatic atomizing and spraying member to which the coating material leaving the edge of the inner member is attracted and ineluding an edge which is radially spaced from the edge of the inner rotatable member and from which the electrostatically atomized particles of coating material are directed on to theobject to be spray coated, an insulating member for coaxially and mechanically interconnecting said inner and said outer members, means for applying a direct high potential to said outer electrostatic member, means for feeding liquid coating material to said inner member, and an electric motor fixed to said gun for rotating at least the inner member of said head.
  • a spray gun for centrifugally and electrostatically atomizing and spraying a liquid coating material on to an object to be coated comprising a head having an inner rotatable electrically conducting member of generally cylindrical shape for effecting an initial atomization of the coating material by means of centrifugal force and including an edge by means of which the initially atomized coating material leaves said inner member, an outer generally cylindrical electrostatic atomizing and spraying member to which the coating material leaving the edge of the inner member is attracted and including an edge which is radially spaced from the edge of the inner rotatable member and from which the electrostatically atomized particles of coating material are directed on to the object to be spray coated, an insulating member for coaxially and mechanically interconnecting said inner and said outer members, means for applying a direct high potential to said outer electrostatic member, means for feeding liquid coating material to said inner member, and an electric motor fixed to said gun for rotating said head and wherein said edge of the outer electrostatic atomizing and spraying member is situated in front of the plane of the

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  • Electrostatic Spraying Apparatus (AREA)
US27875A 1959-05-20 1960-05-09 Gun for atomization and electrostatic spraying of materials Expired - Lifetime US3075706A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR795017A FR1234788A (fr) 1959-05-20 1959-05-20 Pistolets à double tête pour pulvérisation et projection électrostatiques

Publications (1)

Publication Number Publication Date
US3075706A true US3075706A (en) 1963-01-29

Family

ID=8714947

Family Applications (1)

Application Number Title Priority Date Filing Date
US27875A Expired - Lifetime US3075706A (en) 1959-05-20 1960-05-09 Gun for atomization and electrostatic spraying of materials

Country Status (6)

Country Link
US (1) US3075706A (en))
CH (1) CH365980A (en))
DE (1) DE1103195B (en))
FR (1) FR1234788A (en))
GB (1) GB923392A (en))
NL (1) NL251152A (en))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279429A (en) * 1962-04-25 1966-10-18 Sames Sa De Machines Electrost Spray-coating apparatus
US4955960A (en) * 1987-03-23 1990-09-11 Behr Industrieanlagen Gmbh & Co. Apparatus for coating workpieces electrostatically
US5775598A (en) * 1995-04-06 1998-07-07 Abb Industry K.K. Rotary atomizing head type coating machine
US5885351A (en) * 1997-02-18 1999-03-23 Pfs Thermoplastic Powder Coatings, Inc. Tribocharge applicator device

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA791659B (en) * 1978-04-17 1980-04-30 Ici Ltd Process and apparatus for spraying liquid
US4398672A (en) * 1980-03-20 1983-08-16 National Research Development Corporation Electrostatic spraying
DE3129151A1 (de) 1980-08-06 1982-03-18 National Research Development Corp., London "vorrichtung zum elektrostatischen spruehen von fluessigkeit"
US4489894A (en) * 1981-02-27 1984-12-25 National Research Development Corporation Inductively charged spraying apparatus
JPS58190457U (ja) * 1982-06-10 1983-12-17 富士写真フイルム株式会社 静電塗装装置
EP0121288B1 (en) * 1983-01-06 1989-05-17 National Research Development Corporation Electrostatic spray head
GB8305865D0 (en) * 1983-03-03 1983-04-07 British Res Agricult Eng Electrostatic sprayers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2658009A (en) * 1948-05-13 1953-11-03 Ransburg Electro Coating Corp Electrostatic coating method and apparatus
US2781279A (en) * 1951-11-26 1957-02-12 Ransburg Electro Coating Corp Method and apparatus for spray coating of articles
US2809902A (en) * 1951-08-09 1957-10-15 Ransburg Electro Coating Corp Method and apparatus for electrostatically coating articles
US2922584A (en) * 1956-11-19 1960-01-26 Ford Motor Co Dual spray painting
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2658009A (en) * 1948-05-13 1953-11-03 Ransburg Electro Coating Corp Electrostatic coating method and apparatus
US2809902A (en) * 1951-08-09 1957-10-15 Ransburg Electro Coating Corp Method and apparatus for electrostatically coating articles
US2781279A (en) * 1951-11-26 1957-02-12 Ransburg Electro Coating Corp Method and apparatus for spray coating of articles
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
US2922584A (en) * 1956-11-19 1960-01-26 Ford Motor Co Dual spray painting

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3279429A (en) * 1962-04-25 1966-10-18 Sames Sa De Machines Electrost Spray-coating apparatus
US4955960A (en) * 1987-03-23 1990-09-11 Behr Industrieanlagen Gmbh & Co. Apparatus for coating workpieces electrostatically
US5775598A (en) * 1995-04-06 1998-07-07 Abb Industry K.K. Rotary atomizing head type coating machine
US5885351A (en) * 1997-02-18 1999-03-23 Pfs Thermoplastic Powder Coatings, Inc. Tribocharge applicator device

Also Published As

Publication number Publication date
CH365980A (fr) 1962-11-30
GB923392A (en) 1963-04-10
NL251152A (en))
FR1234788A (fr) 1960-10-19
DE1103195B (de) 1961-03-23

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