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Publication numberUS3492409 A
Publication typeGrant
Publication dateJan 27, 1970
Filing dateOct 6, 1966
Priority dateOct 28, 1963
Publication numberUS 3492409 A, US 3492409A, US-A-3492409, US3492409 A, US3492409A
InventorsDrum Edward W, Williams Herschel A
Original AssigneeRansburg Electro Coating Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
High voltage cable termination
US 3492409 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)


f V26 I PAINT I PUMP 9 I BRA/D z -m saz/ir/ou United States Patent 3,492,409 HIGH VOLTAGE CABLE TERMINATION Herschel A. Williams, Manchester, Tenn., and Edward W. Drum, Indianapolis, Ind., assignors to Ransburg Electro-Coating Corp., a corporation of Indiana Original application Oct. 28, 1963, Ser. No. 319,142, now Patent No. 3,292,860, dated Dec. 20, 1966. Divided and this application Oct. 6, 1966, Ser. No. 584,709

Int. Cl. H02g 15/02, 15/08; H01r 13/54 US. Cl. 174-78 9 Claims ABSTRACT OF THE DISCLOSURE A high voltage cable having a conductive braid sheath secured to a terminal fitting sleeve with a conductive cement providing electrical continuity and a structural cement providing a physical connection.

This application is a division of Williams et al., Ser. No. 319,142, filed Oct. 28, 1963, now Patent 3,292,860.

This invention relates to a high voltage cable termination, particularly for securely anchoring a cable to a de' vice, as an electrostatic spray gun.

A high voltage cable, such as that used with electrostatic coating equipment, has a central body of insulating material, as polyethylene, with a conductor in the center thereof. Surrounding the polyethylene body is a woven conductive covering which is grounded. A thin sheath of insulating material surrounds the woven conductive covering. A metallic element surrounds the insulating sheath providing physical protection for the cable. It is necessary to attach the cable securely to the device with which it is used, with a good electrical connection at least to the woven conductive covering and a mechanical connection to anchor the cable securely.

A feature of the invention is that the high voltage cable has a terminal fitting including a sleeve with a bore through which the cable extends. The braid of the cable is electrically connected to the sleeve with a conductive cement and the cable is securely anchored in the fitting with a structural cement.

Further features and advantages of the invention will readily be apparent from thefollowing specification and from the drawings, in which:

FIGURE 1 is a diagrammatic illustration of a system embodying the invention; and

FIGURE 2 is an enlarged fragmentary section through the cable fitting.

In a hand spray gun the various connecting cables or hoses, as for paint, air and high voltage, should enter the gun in such a manner that they do not destroy the balance or maneuverability of the gun. It is generally desirable that they enter through the rear of the gun and preferably through the base of the handle. This presents certain problems in isolating the coating material passage from the high voltage circuit.

In the system of FIGURE 1 of the drawings, spray gun 5 has a barrel portion 6 with a spray 7 of particles of coating material emitted from the front thereof and directed generally toward articles to be coated, carried by a grounded conveyor (not shown). A spray charging electrode 8 is connected through a circuit in the gun (not shown) and high voltage cable 9 with a source 10 of high voltage, establishing a high intensity electrostatic field extending from the electrode to the grounded articles. The spray particles acquire a charge and are attracted to and deposited on the grounded articles. A coating material conduit 11, of insulating material, is connected with the gun near the front of the barrel and supplies coating material from a pump 12 through a valve 13. Air pump 3,492,409 Patented Jan. 27, 1970 14 is connected through hose 15 with an air inlet at the rear of the barrel 6.

A conductive support 17 extends downwardly from the rear of barrel 6 through a carrier ring 18 on which the gun is mounted. Valve 13 is mounted on gun support 17.

A control unit 19, shown diagrammatically, may be provided to control valve 13, high voltage source 10 and air pump 14. The details of the control unit are not important to the present invention. It is sufficient to point out that paint valve 13 should not be opened except when both air and high voltage are available.

A high voltage circuit housing has a first leg which extends through the bore of barrel 6 and a second leg 21, at right angles to the first leg, which extends through steel support tube 17. The high voltage housing is of a suitable high dielectric material, as polyethylene.

The high voltage cable, best seen in FIGURE 2, has an outer conductive and protective member 23 surrounding a neoprene sheath 24. Within the sheath is a braid 25 of conductive material which overlies the polyethylene insulating body 26. Insulating body 26 and inner conductor 27 extend through leg 21 of the high voltage housing. The fitting which is secured to the cable and provides for attachment of the cable to the lower end of support 17, includes a ferrule 28 and a threaded ring 29. Ferrule 28 has bore portions 28a and 28b of differing diameter with shoulder 28c between. The outer conductive member is fastened to narrower bore portion 28 11. It is important that a good electrical connection be formed between the braid and the ferrule, to ground the apparatus through the inner braid which is grounded at the high voltage power supply 10. Thus, support 17 and coating material valve 13 (FIGURE 1) are electrically grounded.

A quantity of conductive epoxy cement 31 connects thebraid 25 and ferrule. The remainder of the recess between the ferrule and the cable is filled with a body 32 of structural epoxy cement which secures and retains the braid and bears against shoulder 28c, locking the cable and ferrule together.

We claim:

1. In a high voltage electrical device having a high voltage cable with inner conductor, a layer of insulating material and a conductive sheath, a connecting fitting, comprising:

a conductive sleeve having a bore through which the cable extends into said device, said bore having an outer portion and an inner portion;

a body of conductive cement between said conductive sheath and the sleeve in the outer portion of the bore; and

a body of structural cement between the cable and the sleeve in the inner portion of the bore, securing the cable against movement outwardly ,of the fitting.

2. The cable and cable fitting of claim 1 wherein said body of structural cement and said sleeve have interlocking surfaces.

3. The cable and cable fitting of claim 2 wherein the outer bore portion is narrower than the inner bore portion, with a wall surface joining the inner walls of said bore portions, said body of structural cement bearing against said wall surface.

4. The cable and cable fitting of claim 3 wherein said wall surface is a shoulder generally perpendicular to each bore portion.

5. The cable and cable fitting of claim 1 wherein said cable has a protective covering outside said conductive sheath which terminates short of the body of conductive cement between the conductive 'sheath and fitting.

6. The cable and cable fitting of claim 5 wherein said protective covering includes an insulating sheath surrounded by a conductive element.

7. In combination, the high voltage cable and the high References Cited voltage cable fitting of claim 1 and an electrostatic spray UNITED STATES PATENTS gun connected to the high voltage cable and to the high 2 043 341 6/1936 Turechek 174 76 X g g l 215201705 8/1950 Wittlinger 174 35.1

. e combination of clalm 7, wherein the fitting 5 3117298 1/1964 Grunwald 338 312 further includes a ring securing the fitting to the gun, 3367578 l 2/1968 Juvinan et Q'ZZT; the ring including a flange and the sleeve including a 2:402:049 6/1946 lngans X flange which engages with the flange of the ring whereby the cable is attached to the gun. LARAMIE E. ASKIN, Primary Examiner 9. The combination of claim 8, wherein the ring is 10 threaded and is turned onto a threaded conductive support of the electrostatic spray gun. 174-78; 339-89; 23915

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2043341 *Aug 20, 1934Jun 9, 1936Technicraft Engineering CorpCable head and method of construction
US2402049 *Oct 9, 1942Jun 11, 1946Titeflex IncRadio-shielded spark plug lead
US2520705 *Mar 21, 1945Aug 29, 1950Gen Motors CorpShielded ignition cable
US3117298 *Feb 16, 1962Jan 7, 1964Cts CorpPrinted circuit terminal for and method of terminating an electrical control
US3367578 *Dec 27, 1966Feb 6, 1968Ransburg Electro Coating CorpElectrostatic spray coating apparatus
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3920172 *Oct 3, 1974Nov 18, 1975Bendix CorpConductive glass seal assembly
US4241973 *Aug 4, 1978Dec 30, 1980Ppg Industries, Inc.Coaxial cable terminal connector especially suitable for high-voltage, low-current electrostatic uses and method of making same
US4878622 *Jun 17, 1988Nov 7, 1989Ransburg CorporationPeristaltic voltage block
US4982903 *May 31, 1989Jan 8, 1991Ransburg CorporationPeristaltic voltage block
US5154357 *Mar 22, 1991Oct 13, 1992Ransburg CorporationPeristaltic voltage blocks
US5193750 *Mar 22, 1991Mar 16, 1993Ransburg CorporationPeristaltic voltage block roller actuator
US5411210 *Jun 5, 1992May 2, 1995Ransburg CorporationAutomatic coating using conductive coating materials
US9228686 *Nov 28, 2012Jan 5, 2016Baker Hughes IncorporatedTransmission line for drill pipes and downhole tools
US20140144537 *Nov 28, 2012May 29, 2014Volker PetersWired pipe coupler connector
US20160076364 *Nov 20, 2015Mar 17, 2016Baker Hughes IncorporatedTransmission line for drill pipes and downhole tools
WO1989012508A1 *Jun 6, 1989Dec 28, 1989Ransburg CorporationPeristaltic voltage block
U.S. Classification174/78, 239/690, 439/320
International ClassificationB05B5/053, H01R4/00, H01R4/64, B05B5/025
Cooperative ClassificationB05B5/053, H01R4/00, H01R4/64
European ClassificationH01R4/64, H01R4/00, B05B5/053