US3072341A - Spray head for electrostatic spraying apparatus - Google Patents

Spray head for electrostatic spraying apparatus Download PDF

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Publication number
US3072341A
US3072341A US24159A US2415960A US3072341A US 3072341 A US3072341 A US 3072341A US 24159 A US24159 A US 24159A US 2415960 A US2415960 A US 2415960A US 3072341 A US3072341 A US 3072341A
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United States
Prior art keywords
spray head
body portion
collar
spraying apparatus
electrostatic spraying
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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
US24159A
Inventor
Point Marcel Auguste Roger
Morel Roger Claudius
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Machines Electrostatiques SA
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Sames Mach Electrostat
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Filing date
Publication date
Priority claimed from FR793247A external-priority patent/FR75634E/en
Application filed by Sames Mach Electrostat filed Critical Sames Mach Electrostat
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Publication of US3072341A publication Critical patent/US3072341A/en
Anticipated expiration legal-status Critical
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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
    • 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

Definitions

  • the present invention relates to improvements in rotating heads for electrostatic atomisation and spraying, having a sharp or tapered edge for electric leakage and combining electrical atomising with atomisation by centrifugal force.
  • Such heads are employed in portable, stationary or semi-portable apparatus for coating objects with fine particles of material, such as paint for example.
  • Such an electrostatic head may be made of a material which is only slightly conductive, so as to avoid the possible danger which would arise if the head is brought close to an object which has a large difference of potential relative to it.
  • the present invention comprises a rotatable head for electrostatic atomisation and spraying having a sharp or tapered edge for electric leakage and combining electrical atomising with atomisation by centrifugal force, more particularly for coating objects with substances such as paint, wherein the head comprises a body portion to which is secured a detachable collar which projects forwardly from the body portion and is provided with the sharp or tapering atomisation edge, said collar being made of a high resistivity material.
  • the body 1 of the head is constituted by a rigid generally cylindrical member made of metal or of a high resistivity material, for example a suitable plastic material.
  • the external surface of this member is provided with a surrounding rib 2 on which it is easy to fix a detachable collar 3 having a complementary groove 6.
  • the collar 3 is made of a high resistivity material, for example of an epoxy resin having a lamp black or carbon black filling. It could also be made of slightly conductive rubber. Generally speaking, the material utilised must preferably have a resistivity of the order of ohms/cm. This being so, the resistance of the head measured between the axis of rotation and the plane of the atomisation edge, amounts to a few megohms.
  • the outlet end of the member 1 may have a rela tively rounded edge 4, while the collar 3 will be provided with the sharp or tapering atomisation and spraying edge 5.
  • This construction has a number of advantages since it is particularly robust and stands up Well to use. Moreover by making the collar detachable it can easily be replaced after wear or deterioration. Additionally it can be replaced by a collar of a different shape in order to achieve a different spraying effect.
  • the rib may be formed on the interior surface of the collar to engage with a groove on the external surface of the body 1.
  • a spray head for an electrostatic spraying apparatus for coating objects with a material such as paint comprising a generally cylindrical body portion, a collar of an electrically high resistivity material having a resistivity of the order of 10 ohms/ cm. detachably secured to the external surface of said body portion and having a part which extends forwadly of the body portion and which includes a tapering edge.
  • a spray head for an electrostatic spraying apparatus for coating objects with a material such as paint comprising a generally cylindrical body portion, a collar of a material having a electrical resistivity substantially of the order of 1G ohms/cm. detachably secured to the external surface of said body portion by means of at least one rib on said body portion which engages with at least one complementary groove on said collar, and a part of said collar which projects forwardly from the body portion and which includes a tapering edge.
  • a spray head for an electrostatic spraying apparatus for coating objects with a material such as paint comprising a generally cylindrical body portion, a collar of a synthetic resin material incorporating lamp black having an electrical resistivity substantially of the order of 10 ohms/cm. detachably secured to the external surface of said body portion by means of at least one rib on said body portion which engages with at least one complementary groove on said collar, and a part of said collar which projects forwardly from the body portion and which includes a tapering edge.
  • a spray head for an electrostatic spraying apparatus for coating objects with a material such as paint comprisnig a generally cylindrical body portion, a collar of a slightly conducitve rubber having an electrical resistivity substantially of the order of 10 ohms/cm. detachably secured to the external surface of said body portion by means of at least one rib on said body portion which engages with at least one complementary groove on said collar, and a part of said collar which projects forwardly from the body portion and which includes a tapering edge.

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  • Electrostatic Spraying Apparatus (AREA)
  • Medicinal Preparation (AREA)

Description

Jan. 8, 1963 M. A. R. POINT ETAL 3,072,341
SPRAY HEAD FOR ELECTROSTATIC SPRAYING APPARATUS Filed April 22. 1960 ttorn eys,
United States Patent Qfifice 3,072,341 Patented Jan. 8, 1963 3,072,341 SPRAY HEAD FOR ELECTROSTATIQ SPRAYING APPARATUS Marcel Auguste Roger Point and Roger Claudius Morel, Grenoble, France, assignors to Societe Anonyme de Machines Electrostatiques, Grenoble, France, a French body corporate Filed Apr. 22, 1960, Ser. No. 24,159 Claims priority, application France Apr. 27, 1959 7 Claims. (Cl. 239-224) The present invention relates to improvements in rotating heads for electrostatic atomisation and spraying, having a sharp or tapered edge for electric leakage and combining electrical atomising with atomisation by centrifugal force. Such heads are employed in portable, stationary or semi-portable apparatus for coating objects with fine particles of material, such as paint for example.
It is known that such an electrostatic head may be made of a material which is only slightly conductive, so as to avoid the possible danger which would arise if the head is brought close to an object which has a large difference of potential relative to it.
The present invention comprises a rotatable head for electrostatic atomisation and spraying having a sharp or tapered edge for electric leakage and combining electrical atomising with atomisation by centrifugal force, more particularly for coating objects with substances such as paint, wherein the head comprises a body portion to which is secured a detachable collar which projects forwardly from the body portion and is provided with the sharp or tapering atomisation edge, said collar being made of a high resistivity material.
The invention will now be further described with reference to the accompanying drawing which is a crosssection through one embodiment of atomising head according to this invention.
Referring to the drawing, the body 1 of the head is constituted by a rigid generally cylindrical member made of metal or of a high resistivity material, for example a suitable plastic material. The external surface of this member is provided with a surrounding rib 2 on which it is easy to fix a detachable collar 3 having a complementary groove 6.
The collar 3 is made of a high resistivity material, for example of an epoxy resin having a lamp black or carbon black filling. It could also be made of slightly conductive rubber. Generally speaking, the material utilised must preferably have a resistivity of the order of ohms/cm. This being so, the resistance of the head measured between the axis of rotation and the plane of the atomisation edge, amounts to a few megohms. The outlet end of the member 1 may have a rela tively rounded edge 4, while the collar 3 will be provided with the sharp or tapering atomisation and spraying edge 5. j
This construction has a number of advantages since it is particularly robust and stands up Well to use. Moreover by making the collar detachable it can easily be replaced after wear or deterioration. Additionally it can be replaced by a collar of a different shape in order to achieve a different spraying effect.
It will be clear that various modifications may be made without departing from the scope of the present invention. Thus the rib may be formed on the interior surface of the collar to engage with a groove on the external surface of the body 1.
We claim:
1. A spray head for an electrostatic spraying apparatus for coating objects with a material such as paint, said spray head comprising a generally cylindrical body portion, a collar of an electrically high resistivity material having a resistivity of the order of 10 ohms/ cm. detachably secured to the external surface of said body portion and having a part which extends forwadly of the body portion and which includes a tapering edge.
2. A spray head according to claim 1, wherein said high resistivity material is a synthetic resin incorporating lamp black.
3. A spray head according to claim 1, wherein said high resistivity material is a slightly conductive rubber.
4. A spray head according to claim 1, wherein the body portion of the head is made of an electrically conducting material. I
5. A spray head for an electrostatic spraying apparatus for coating objects with a material such as paint, said spray head comprising a generally cylindrical body portion, a collar of a material having a electrical resistivity substantially of the order of 1G ohms/cm. detachably secured to the external surface of said body portion by means of at least one rib on said body portion which engages with at least one complementary groove on said collar, and a part of said collar which projects forwardly from the body portion and which includes a tapering edge.
6. A spray head for an electrostatic spraying apparatus for coating objects with a material such as paint, said spray head comprising a generally cylindrical body portion, a collar of a synthetic resin material incorporating lamp black having an electrical resistivity substantially of the order of 10 ohms/cm. detachably secured to the external surface of said body portion by means of at least one rib on said body portion which engages with at least one complementary groove on said collar, and a part of said collar which projects forwardly from the body portion and which includes a tapering edge.
7. A spray head for an electrostatic spraying apparatus for coating objects with a material such as paint, said spray head comprisnig a generally cylindrical body portion, a collar of a slightly conducitve rubber having an electrical resistivity substantially of the order of 10 ohms/cm. detachably secured to the external surface of said body portion by means of at least one rib on said body portion which engages with at least one complementary groove on said collar, and a part of said collar which projects forwardly from the body portion and which includes a tapering edge.
References Cited in the file of this patent UNITED STATES PATENTS 2,352,252 Canetta June 27, 1944 2,658,009 Ransberg Nov. 3, 1953 2,781,279 Miller Feb. 12, 1957 2,901,177 Norris Au 25. 1959

Claims (1)

1. A SPRAY HEAD FOR AN ELECTROSTATIC SPRAYING APPARATUS FOR COATING OBJECTS WITH A MATERIAL SUCH AS PAINT, SAID SPRAY HEAD COMPRISING A GENERALLY CYLINDRICAL BODY PORTION, A COLLAR OF AN ELECTRICALLY HIGH RESISTIVITY MATERIAL HAVING A RESISTIVITY OF THE ORDER OF 10**6 OHMS/CM. DETACHABLY SECURED TO THE EXTERNAL SURFACE OF SAID BODY PORTION
US24159A 1959-03-31 1960-04-22 Spray head for electrostatic spraying apparatus Expired - Lifetime US3072341A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR790762A FR75411E (en) 1959-03-31 1959-03-31 Apparatus for electrostatic spraying and projection
FR793247A FR75634E (en) 1959-04-27 1959-04-27 Apparatus for electrostatic spraying and projection
FR808194A FR76467E (en) 1959-03-31 1959-10-22 Apparatus for electrostatic spraying and projection

Publications (1)

Publication Number Publication Date
US3072341A true US3072341A (en) 1963-01-08

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US16359A Expired - Lifetime US3063642A (en) 1959-03-31 1960-03-21 Rotating heads for electrostatic atomizing and spraying apparatus
US24159A Expired - Lifetime US3072341A (en) 1959-03-31 1960-04-22 Spray head for electrostatic spraying apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US16359A Expired - Lifetime US3063642A (en) 1959-03-31 1960-03-21 Rotating heads for electrostatic atomizing and spraying apparatus

Country Status (6)

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US (2) US3063642A (en)
BE (1) BE588913A (en)
CH (2) CH365979A (en)
FR (4) FR1110350A (en)
GB (2) GB917683A (en)
NL (2) NL249797A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641971A (en) * 1967-09-01 1972-02-15 Arvid C Walberg Apparatus for preventing arcing in an electrostatic coating system
US3938740A (en) * 1973-10-04 1976-02-17 Atlas Copco Aktiebolag Nozzle for electrostatic spray gun
US3938739A (en) * 1973-04-19 1976-02-17 Atlas Copco Aktiebolag Nozzle for electrostatic spray gun
DE2713328A1 (en) * 1977-03-25 1978-10-05 Gema Ag DEVICE FOR ELECTROSTATICALLY APPLICATION OF COATING MATERIAL TO OBJECTS
US4739935A (en) * 1986-03-12 1988-04-26 Nordson Corporation Flexible voltage cable for electrostatic spray gun
US5775598A (en) * 1995-04-06 1998-07-07 Abb Industry K.K. Rotary atomizing head type coating machine
US6003785A (en) * 1997-05-27 1999-12-21 Sames Electrostatic, Inc. Composite material bell cup

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3055592A (en) * 1956-12-17 1962-09-25 Ransburg Electro Coating Corp Liquid atomizing apparatus
FR1110350A (en) * 1959-03-31 1956-02-10 Sames Mach Electrostat Apparatus for electrostatic spraying and projection
NL270215A (en) * 1960-11-02
US3121533A (en) * 1961-04-12 1964-02-18 Jr John Sedlacsik Electrostatic atomizing head
US3120736A (en) * 1961-05-29 1964-02-11 Cosmic Inc Method and apparatus for colloidal propulsion
FR1300822A (en) * 1961-06-23 1962-08-10 Sames Mach Electrostat Improvements to liquid spray heads for coating objects
US3144209A (en) * 1961-10-20 1964-08-11 Westinghouse Electric Corp Rotatable spray apparatus
US3219013A (en) * 1962-05-04 1965-11-23 Gen Motors Corp Precharging device for electrostatic painting apparatus
US3224680A (en) * 1964-06-11 1965-12-21 Ford Motor Co Atomizing apparatus having a liquid accumulation cavity
GB1125796A (en) * 1966-05-26 1968-08-28 Aerocoat Sa Improvements in or relating to methods and apparatus for applying powder coatings to articles
DE3001209C2 (en) * 1980-01-15 1985-07-25 Behr, Hans, 7000 Stuttgart Device for atomizing liquid paint, in particular paint atomizer
JPS5921668B2 (en) * 1980-02-18 1984-05-21 トヨタ自動車株式会社 Rotary atomization electrostatic coating equipment
JPS56163779A (en) * 1980-05-23 1981-12-16 Toyota Motor Corp Rotary atomization electrostatic painting device
JPS56115653A (en) * 1980-02-19 1981-09-10 Toyota Motor Corp Rotary atomized electrostatic coating device
US4398672A (en) * 1980-03-20 1983-08-16 National Research Development Corporation Electrostatic spraying
JPS56141867A (en) * 1980-04-04 1981-11-05 Toyota Motor Corp Rotary atomizing electrostatic coating device
JPS56141864A (en) * 1980-04-04 1981-11-05 Toyota Motor Corp Rotary atomizing electrostatic coating device
JPS6012578B2 (en) * 1980-04-04 1985-04-02 トヨタ自動車株式会社 Rotation speed detection device for rotary atomization electrostatic coating equipment
JPS56141868A (en) * 1980-04-04 1981-11-05 Toyota Motor Corp Rotary atomizing electrostatic coating device
JPS56166961A (en) * 1980-05-26 1981-12-22 Toyota Motor Corp Rotary electrostatic spray painting apparatus
JPS56163777A (en) * 1980-05-23 1981-12-16 Toyota Motor Corp Rotary atomization electrostatic painting device
JPS56163775A (en) * 1980-05-21 1981-12-16 Toyota Motor Corp Rotary atomization electrostatic painting device
JPS56163776A (en) * 1980-05-21 1981-12-16 Toyota Motor Corp Rotary atomization electrostatic painting device
JPS56163774A (en) * 1980-05-21 1981-12-16 Toyota Motor Corp Rotary atomization electrostatic painting device
FR2483263A1 (en) * 1980-05-27 1981-12-04 Marchand Bernard ROTATING ATOMIZING HEAD FOR APPLIANCE APPLIANCES, ELECTROSTATICALLY, OF LIQUID PRODUCTS, SUCH AS, IN PARTICULAR, PAINTS AND VARNISHES
US4489894A (en) * 1981-02-27 1984-12-25 National Research Development Corporation Inductively charged spraying apparatus
JPS57144053A (en) * 1981-03-04 1982-09-06 Toyota Motor Corp Rotary atomizing electrostatic coating device
DE3478202D1 (en) * 1983-01-06 1989-06-22 Nat Res Dev Electrostatic spray head
GB8305865D0 (en) * 1983-03-03 1983-04-07 British Res Agricult Eng Electrostatic sprayers
US4684064A (en) * 1985-08-19 1987-08-04 Graco Inc. Centrifugal atomizer
JP3726329B2 (en) * 1996-02-16 2005-12-14 トヨタ自動車株式会社 Bell head of rotary atomizing electrostatic coating machine and rotary atomizing electrostatic coating machine
US6076751A (en) * 1998-12-15 2000-06-20 Illinois Tool Works Inc. Method of charging using nonincendive rotary atomizer
US8602326B2 (en) * 2007-07-03 2013-12-10 David M. Seitz Spray device having a parabolic flow surface

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2352252A (en) * 1941-10-31 1944-06-27 Westinghouse Air Brake Co Sanding control means
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
US2901177A (en) * 1956-08-30 1959-08-25 Edward O Norris Spraying apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR1110350A (en) * 1959-03-31 1956-02-10 Sames Mach Electrostat Apparatus for electrostatic spraying and projection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2352252A (en) * 1941-10-31 1944-06-27 Westinghouse Air Brake Co Sanding control means
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
US2901177A (en) * 1956-08-30 1959-08-25 Edward O Norris Spraying apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641971A (en) * 1967-09-01 1972-02-15 Arvid C Walberg Apparatus for preventing arcing in an electrostatic coating system
US3938739A (en) * 1973-04-19 1976-02-17 Atlas Copco Aktiebolag Nozzle for electrostatic spray gun
US3938740A (en) * 1973-10-04 1976-02-17 Atlas Copco Aktiebolag Nozzle for electrostatic spray gun
DE2713328A1 (en) * 1977-03-25 1978-10-05 Gema Ag DEVICE FOR ELECTROSTATICALLY APPLICATION OF COATING MATERIAL TO OBJECTS
US4739935A (en) * 1986-03-12 1988-04-26 Nordson Corporation Flexible voltage cable for electrostatic spray gun
US5775598A (en) * 1995-04-06 1998-07-07 Abb Industry K.K. Rotary atomizing head type coating machine
US6003785A (en) * 1997-05-27 1999-12-21 Sames Electrostatic, Inc. Composite material bell cup

Also Published As

Publication number Publication date
GB932998A (en) 1963-07-31
GB917683A (en) 1963-02-06
NL249797A (en) 1964-04-10
CH365979A (en) 1962-11-30
US3063642A (en) 1962-11-13
CH362945A (en) 1962-06-30
NL250890A (en) 1964-02-25
FR76165E (en) 1961-09-22
FR76467E (en) 1961-10-20
FR1110350A (en) 1956-02-10
BE588913A (en) 1960-07-18
FR75411E (en) 1961-06-09

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