US3585448A - Shockless-type static eliminator with semiconductive coupling - Google Patents

Shockless-type static eliminator with semiconductive coupling Download PDF

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Publication number
US3585448A
US3585448A US752697A US3585448DA US3585448A US 3585448 A US3585448 A US 3585448A US 752697 A US752697 A US 752697A US 3585448D A US3585448D A US 3585448DA US 3585448 A US3585448 A US 3585448A
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United States
Prior art keywords
semiconductive
conductive
points
shockless
tubular
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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
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US752697A
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English (en)
Inventor
Dolph Simons
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.)
Simco Co Inc
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Simco Co Inc
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Filing date
Publication date
Application filed by Simco Co Inc filed Critical Simco Co Inc
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Publication of US3585448A publication Critical patent/US3585448A/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/04—Carrying-off electrostatic charges by means of spark gaps or other discharge devices

Definitions

  • a high resistance series element between adjacent discharge points but at the same time is sufficiently conductive to function as a condenser plate when insulated from the high voltage conductive member by a suitable dielectric.
  • the present invention resides in the use of a single partially conductive or semiconductive tube or sheath which supports a plurality of longitudinally spaced conductive needles about the periphery of the insulated cable to which the high voltage AC power source is connected.
  • the material from which the semiconductive sheath is fabricated may have a resistivity of ohm centimeters as compared to an insulator which would be in excess of 10 ohm centimeters. Also desirable would be to duplicate the maximum shorting current in .the prior shockless-type static eliminators, approximately 7 microamperes which might represent the current discharged across adjacent shunted points or across a single point to ground.
  • lt is therefore an object of this invention to provide a means and method for constructing an improved shockless-type static eliminator.
  • Another object of this invention is to provide a shockless static eliminator in which the use of alternate insulative and conductive sleeves is eliminated.
  • Yet another object of this invention is to provide a shockless static eliminator in which the usual alignment problems in registering discharge points with conductive rings is avoided.
  • Yet still another object of this invention is to employ a single semiconductive member for supporting all of the discharge points in spaced capacitative disposition withrespect to a high voltage cable.
  • a further object of this invention is to provide a shockless static eliminator having a single semiconductive member supporting all of the discharge points and wherein the capacitative coupling and the maximum shorting current are substantially the same as those of prior shockless bars.
  • a shockless-type static eliminator comprising a first conductive member in the form of an insulated flexible cable, generally designated as A, a tube of semiconductive material, generally designated as B, coaxially arranged about the cable, a plurality of longitudinally spaced conductive needles or discharge points, generally designated as C, mounted in the tube and projecting radially therefrom, and a casing or housing D shielding the points.
  • the first conductive member A may be any conventional flexible cable having an internal wire conductor 12 which is preferably stranded copper and sheathed by a polyethylene jacket 14.
  • An external coating 16 of suitable insulation, such as vinyl plastic, provides a protective as well as insulative cover for the jacket 14.
  • the sheath or tube B is composed of a semiconductive material having a resistivity in the range of 10 ohm centimeters.
  • a suitable composition for this purpose has been found to be a phenolic resin base compounded with carbon black or other conductive material to provide a volume resistivity approximating 2000 to 3000 megohms per cubic centimeter.
  • the inside diameter of the tube B is such as to provide a sliding fit with the exterior of the cable cover 16.
  • the thickness'of the tube wall must be sufficient to support the needles C when pressed into holes radially passing through the wallnThe holes are longitudinally spaced on 34 inch centers.
  • the needles C which are of steel construction for combined strength and conductivity, are pressed through the holes so that the base of the points is flush with the inner surface of the tube 8.
  • the holes in the tube B may be blind such thatthey extend radially from the outer diameter to a position short of the inside diameter. This variation (not shown) would space the bases of the needles C from the interior wall of the tube and thereby provide additional insulation between the needles and the wire conductor 12.
  • the distal end of the cable A is encapsulated in a vinyl cup 18 after being inserted through the semiconductive tube B from the opposite end.
  • the insulative cup or plug 18 is secured within a counterbore at the distal end of the tube B so as to be flush with the end thereof.
  • An outer insulative collar 20 made of a suitable dielectric, such as an acrylic resin, is cemented over the end of the tube B and is retained within the casing D by means of a setscrew 22.
  • the cup 18 and the collar 20 assure insulation of the wire conductor 12 which is coupled to the high voltage power supply E.
  • a second insulative collar 24 isretained within the casing D at the opposite end thereof by setscrew 26.
  • the two collars 20 and 24 together with a medial insulative spacer 28 maintain the tube B in concentric disposition within the shield casing D.
  • the needles C extend coaxially within longitudinally spaced apertures 30 extending through the casing wall.
  • the casing D is made of brass or aluminum to provide strength, structural rigidity and conductivity.
  • the ground side of the high voltage power supply E is connected tothe casing D such that a high'voltage field exists between the inner wire conductor 12 and the casing shield.
  • the power supply E is any suitable alternating current high voltage generator capable of supplying an output of perhaps 5000 to 15,000 volts. The current capacity of such a generator is in the 2 to 22 milliampere range.
  • the approximate maximum current which could result from a person shorting adjacent points or shorting a point to the casing D through his body would not exceed 7 microamperes.
  • This current at the voltage specified is below that of the threshold of a person's sensitivity to shock.
  • the semiconductive capacitive-resistance coupling achieves an efficient neutralizing system which is essentially shockless in character.
  • a static neutralizing apparatus comprising a first conductive member, a semiconductive member in adjacently spaced noncontacting disposition with said first conductive member and including a dielectric therebetwcen, a plurality of spaced conductive points projecting outwardly from said semiconductive member, a second conductive member spaced about said points, and means for connecting an alternating current high voltage across said first and second conductive members whereby said points are capacitatively coupled to the first conductive member and wherein the shorting current capability across adjacent points or from points to ground is limited by the series resistance of the semiconductive portion intermediate adjacent discharge points.
  • said dielectric comprises a flexible insulation over said first conductor to define a flexible wire cable.
  • discharge points constitute needles having bases flush with the interior surface of said tubular semiconductive member.
  • said second conductive member comprises a tubular member having longitudinally spaced apertures coaxially disposed about the respective points.
US752697A 1968-08-14 1968-08-14 Shockless-type static eliminator with semiconductive coupling Expired - Lifetime US3585448A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US75269768A 1968-08-14 1968-08-14

Publications (1)

Publication Number Publication Date
US3585448A true US3585448A (en) 1971-06-15

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ID=25027401

Family Applications (1)

Application Number Title Priority Date Filing Date
US752697A Expired - Lifetime US3585448A (en) 1968-08-14 1968-08-14 Shockless-type static eliminator with semiconductive coupling

Country Status (8)

Country Link
US (1) US3585448A (xx)
JP (1) JPS4834079B1 (xx)
BE (1) BE735525A (xx)
CH (1) CH510368A (xx)
FR (1) FR2015643A1 (xx)
GB (1) GB1199250A (xx)
NL (1) NL151241B (xx)
SE (1) SE370847B (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2724118A1 (de) * 1976-09-13 1978-03-16 Simco Co Inc Vorrichtung zur beseitigung statischer aufladungen
US4501954A (en) * 1983-06-27 1985-02-26 Proctor-Silex, Inc. Mechanical electrode
US4725732A (en) * 1986-07-02 1988-02-16 Xerox Corporation Pin corotron and scorotron assembly
US4864459A (en) * 1986-10-08 1989-09-05 Office National D'etudes Et De Recherches Aerospatiales Laminar flow hood with static electricity eliminator
US4999733A (en) * 1988-04-28 1991-03-12 Fuji Photo Film Co., Ltd. Web electricity removing roller
US6330146B1 (en) 1999-03-12 2001-12-11 Ion Systems, Inc. Piezoelectric/electrostrictive device and method of manufacturing same
US6807044B1 (en) 2003-05-01 2004-10-19 Ion Systems, Inc. Corona discharge apparatus and method of manufacture
EP2400820A1 (en) * 2009-02-17 2011-12-28 Tooru Nakai Charge supplier
US10582630B1 (en) 2015-12-28 2020-03-03 Roger Graham Method and apparatus for managing static electricity

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5121466U (xx) * 1974-08-03 1976-02-17
JPS5590216A (en) * 1978-12-27 1980-07-08 Tanaka Kikinzoku Kogyo Kk Wire cutter
JPS6364423U (xx) * 1986-10-17 1988-04-28

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US878272A (en) * 1906-05-18 1908-02-04 William H Chapman Conductor for discharging high-voltage electric charges.
US1653599A (en) * 1927-04-08 1927-12-20 Chapman Electric Neutralizer C Discharge bar for neutralizing static electricity
US1787188A (en) * 1930-03-25 1930-12-30 Chapman Electric Neutralizer C Neutralizing apparatus
US2333213A (en) * 1942-02-02 1943-11-02 Slayter Games Static eliminator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US878272A (en) * 1906-05-18 1908-02-04 William H Chapman Conductor for discharging high-voltage electric charges.
US1653599A (en) * 1927-04-08 1927-12-20 Chapman Electric Neutralizer C Discharge bar for neutralizing static electricity
US1787188A (en) * 1930-03-25 1930-12-30 Chapman Electric Neutralizer C Neutralizing apparatus
US2333213A (en) * 1942-02-02 1943-11-02 Slayter Games Static eliminator

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2724118A1 (de) * 1976-09-13 1978-03-16 Simco Co Inc Vorrichtung zur beseitigung statischer aufladungen
US4501954A (en) * 1983-06-27 1985-02-26 Proctor-Silex, Inc. Mechanical electrode
US4725732A (en) * 1986-07-02 1988-02-16 Xerox Corporation Pin corotron and scorotron assembly
US4864459A (en) * 1986-10-08 1989-09-05 Office National D'etudes Et De Recherches Aerospatiales Laminar flow hood with static electricity eliminator
US4999733A (en) * 1988-04-28 1991-03-12 Fuji Photo Film Co., Ltd. Web electricity removing roller
US6330146B1 (en) 1999-03-12 2001-12-11 Ion Systems, Inc. Piezoelectric/electrostrictive device and method of manufacturing same
US6807044B1 (en) 2003-05-01 2004-10-19 Ion Systems, Inc. Corona discharge apparatus and method of manufacture
US20040218337A1 (en) * 2003-05-01 2004-11-04 Gregory Vernitsky Corona discharge apparatus and method of manufacture
EP2400820A1 (en) * 2009-02-17 2011-12-28 Tooru Nakai Charge supplier
EP2400820A4 (en) * 2009-02-17 2012-08-15 Tooru Nakai CHARGE BY SUPPLIERS
US8503154B2 (en) 2009-02-17 2013-08-06 Tooru Nakai Charge supplier
US10582630B1 (en) 2015-12-28 2020-03-03 Roger Graham Method and apparatus for managing static electricity

Also Published As

Publication number Publication date
JPS4834079B1 (xx) 1973-10-18
NL151241B (nl) 1976-10-15
SE370847B (xx) 1974-10-28
DE1941274A1 (de) 1970-02-19
DE1941274B2 (de) 1975-08-21
BE735525A (xx) 1969-12-16
CH510368A (de) 1971-07-15
GB1199250A (en) 1970-07-15
NL6909213A (xx) 1970-02-17
FR2015643A1 (xx) 1970-04-30

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