US3821024A - Current transfer brusher - Google Patents

Current transfer brusher Download PDF

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Publication number
US3821024A
US3821024A US00335331A US33533173A US3821024A US 3821024 A US3821024 A US 3821024A US 00335331 A US00335331 A US 00335331A US 33533173 A US33533173 A US 33533173A US 3821024 A US3821024 A US 3821024A
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US
United States
Prior art keywords
layer
silver
fibres
current transfer
brush
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
US00335331A
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English (en)
Inventor
G Wilkin
Nab I Mc
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.)
JOHN THOMPSON (PIPEWORK AND ORDNANCE DIVISION) Ltd
Rolls Royce Power Engineering PLC
Original Assignee
International Research and Development Co Ltd
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 International Research and Development Co Ltd filed Critical International Research and Development Co Ltd
Application granted granted Critical
Publication of US3821024A publication Critical patent/US3821024A/en
Assigned to JOHN THOMPSON (PIPEWORK AND ORDNANCE DIVISION) LIMITED reassignment JOHN THOMPSON (PIPEWORK AND ORDNANCE DIVISION) LIMITED CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). 14, EFFECTIVE 1-15-74; 4-8-80 AND 12-8-80 Assignors: INTERNATIONAL RESEARCH & DEVELOPMENT COMPANY LIMITED
Assigned to NORTHERN ENGINEERING INDUSTRIES LIMITED reassignment NORTHERN ENGINEERING INDUSTRIES LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: JOHN THOMPSON (PIPEWORK AND ORDANCE DIVISION LIMITED)
Assigned to NORTHERN ENGINEERING INDUSTRIES PLC. reassignment NORTHERN ENGINEERING INDUSTRIES PLC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE FEB. 18, 1982 Assignors: NORTHERN ENGINEERING INDUSTRIES LIMITED
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/24—Laminated contacts; Wire contacts, e.g. metallic brush, carbon fibres
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9265—Special properties
    • Y10S428/929—Electrical contact feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12625—Free carbon containing component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12701—Pb-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12778—Alternative base metals from diverse categories
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12896—Ag-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12944—Ni-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12986—Adjacent functionally defined components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2916—Rod, strand, filament or fiber including boron or compound thereof [not as steel]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2918—Rod, strand, filament or fiber including free carbon or carbide or therewith [not as steel]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/2938—Coating on discrete and individual rods, strands or filaments

Definitions

  • a current transfer brush is composed of refractory fibres, preferably high strength carbon fibres, with a metallic coating on the fibres which is composed of an t under layer of a first metal and an over layer of a second metal.
  • the over layer is of a highly conductive material such as silyer and the under layer which improves coherence and adhesion of the over layer and thereby produces a very low brush voltage drop, is of a material such as nickel.
  • the present invention relates to current transfer brushes consisting of refractory fibres, such as carbon fibres, coated with an eletrically-conductive metallic layer.
  • Such brushes form the subject of our British Pat. No. 1,191,234, French Pat. No. 70,30073 and US. Pat. No. 3,668,451 and are particularly valuable for use in homopolar machines where high speeds of rotation and large currents call for brushes which exhibit a low rate of wear when rubbing against a rapidly moving contact surface and which have high electrical conductivity.
  • the carbon fibres which are employed have very good mechanical properties because of their special method of production and they provide support for the layer of electrically conductive metal, such as silver, which probably carries most of the current.
  • the thickness of the layer is limited because it is essential to maintain the flexibility of the fibre in order to give satisfactory wear rates. Therefore the electrical conductivity cannot be increased simply by using. a thicker coating.
  • the problem underlying the invention is to improve the electrical properties of metal-coated fibre brushes without harming their mechanical properties andthereby suffering from increased wear rates.
  • the solution to this problem is found in the provision of a brush composed of refractory fibres each of which has a metal coating composed of two layers of which the under layer is a homogeneous layer with a smooth surface while the outer layer is of high electrical conductivity, forms a homogeneous coating on the under layer, and has a high ionic mobility giving it the capacity for rapid diffusion across the surface of the under layer to fill cracks which may occur during operation.
  • the metals to be used for the underlayer are those with reasonably stable carbides namely titanium, vanadium,tantalum, chromium, molybdenum, tungsten, manganese, iron, cobalt, nickel, and boron. Of these the preferred materials are chromium, iron, cobalt, and nickel.
  • silver is the preferred material because of its high electrical conductivity and its resistance to oxidation.
  • Gold also has suitable properties but is unlikely to be used because of its high cost. If the brushes are to be run in a reducing atmosphere, thereby avoiding the risk of oxidation, it is possible to use copper, aluminium, cadmium, zinc or lead, copper being preferred. it is also possible to use an alloy of silver and copper.
  • a variety of deposition processes canbe used for ap plying the two layers to the refractory fibres.
  • the preferred process is that of electro-plating and details of how this may be applied are given in our British Pat.
  • the carbon fibres used are high strength fibres of RAE Type I1 produced as described in British Pat. specification No. 1,110,971 by carbonization of polyacrylonitrile fibres while holding them under tension.
  • the average diameter of the filaments is 7.5 p. m'.
  • When such filaments are electroplated with silver to give an average coating thickness, calculated in terms of the amount of metal deposited per unit length of a tow consisting of as many as 10 fibres, of 1.0 u m the electrical resistance is found to be 10 to 20 times higher than would be expected with a uniform layer of this thickness. This is thought to be due to the fact that the silver deposit is nodular and has areas of poor adhesion to the carbon fibre.
  • the average coating thickness was approximately 1 m for the silver layer alone, 0.7 .tm for the nickel layer alone, and 0.5,u m of silver over 0.7 m of nickel.
  • a silver layer applied directly to the carbon fibre by electro-plating from an alkali cyanide bath is nodular and shows areas of poor adhesion where the material will readily flake off under mechanical stress. It is believed that the unevenness of the deposit and its lack of adhesion are responsible for the fact that the resistance per unit length is to times higher than would be expected from the calculated average layer thickness.
  • a nickel layer plated from an acid bath gives a more smooth and homogeneous layer which despite the presence of longitudinal cracks showed little tendency to flake off. The correlation between resistance and calculated layer thickness was better than with silver.
  • the silver layer in addition to reducing the overall resistance along the coated fibre, improves the physical properties in three respects. Firstly, being a softer material, it fills in and cements together any cracks which are present in the nickel layer and thus helps to maintain electrical contact between the nickel and the fibre. Secondly it provides a source of mobile ions to diffuse into cracks formed in the nickel during operation, which again helps to maintain the electrical performance of the layer. Thirdly it reduces thermal gradients in the coating and thereby minimises stresses due to differential expansion.
  • Second Layer high nucleation density on first material, giving homogeneous layer.
  • the material should have little internal stress, and should be of a thickness and resistivity appropriate to the application envisaged.
  • the material should be capable of rapid surface diffusion, giving the ability to seal major defects occuring in the underlayer during brush operation.
  • FIG. 1 is a cross-section of an electrical current transfer brush in accordance with the invention shown in engagement with a current transfer surface
  • FIG. 2 shows on an enlarged scale a fibre with a metallic coating employed in the brush of FIG. 1.
  • an electrical machine comprises a current transfer brush 1 which is in contact with a surface 2 of an electrically conducting member 3.
  • the member 3 may be, for example, a slip ring or commutator segment in a dynamo-electric machine or may be a continuous rail from which the brush 1 collects current, for example for traction purposes in vehicle systems.
  • the brush 1 comprises a plurality of fibres 4 retained in mutual contact with each other along a major part of their length by a casing 5 of metallic material.
  • a braid 6 of electrically conductive material carries current between the brush and windings or terminals of the machine.
  • Each of the fibres 4, as shown in FIG. 2, has a coating composed of a first layer 7 and a second layer 8.
  • the composition and manner of formation of the fibres 4 and the layers 7 and 8 are as described previously and in this preferred construction high strength carbon fibres 4 are coated first with a nickel layer 7 and then with a silver layer 8.
  • the fibres are held in close contact by the clamping action of the casing 5 and may be welded to each other along a portion of their length by way of the metallic fibres. It is important that the fibres should not be welded together at their free ends adjacent the transfer surface 2 since here they must be free to flex individually.
  • the braid 6 may be soldered, welded or rivetted to the casing 5 or alternatively may be connected directly to the fibres.
  • the brush may be held in a conventional brush holder which is spring biassed towards the surface 2.
  • a current transfer brush comprising refractory fibres individually coated with a coating comprising a homogeneous under layer of a first metal closely adherent to the fibre and an over layer of a second metal with high electrical conductivity which adheres to the under layer.
  • a current transfer brush comprising refractory fibres each of which is coated with an under layer of a metal selected from chromium, iron, cobalt, and nickel and an over layer of a metal selected from silver, gold, copper, and alloys of silver and copper.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
  • Non-Insulated Conductors (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
US00335331A 1972-02-29 1973-02-23 Current transfer brusher Expired - Lifetime US3821024A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB925672A GB1388123A (en) 1972-02-29 1972-02-29 Current transfer brushes

Publications (1)

Publication Number Publication Date
US3821024A true US3821024A (en) 1974-06-28

Family

ID=9868476

Family Applications (1)

Application Number Title Priority Date Filing Date
US00335331A Expired - Lifetime US3821024A (en) 1972-02-29 1973-02-23 Current transfer brusher

Country Status (10)

Country Link
US (1) US3821024A (cg-RX-API-DMAC7.html)
JP (1) JPS4899602A (cg-RX-API-DMAC7.html)
AU (1) AU476668B2 (cg-RX-API-DMAC7.html)
CA (1) CA983561A (cg-RX-API-DMAC7.html)
CH (1) CH551088A (cg-RX-API-DMAC7.html)
DE (1) DE2309660A1 (cg-RX-API-DMAC7.html)
FR (1) FR2174191B1 (cg-RX-API-DMAC7.html)
GB (1) GB1388123A (cg-RX-API-DMAC7.html)
IT (1) IT979591B (cg-RX-API-DMAC7.html)
SE (1) SE397025B (cg-RX-API-DMAC7.html)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2423892A1 (fr) * 1978-04-20 1979-11-16 Siemens Ag Balai transmetteur de courant electrique, a tres faible chute de tension
US4226917A (en) * 1977-04-15 1980-10-07 Hitachi, Ltd. Composite joint system including composite structure of carbon fibers embedded in copper matrix
DE3217217A1 (de) * 1981-05-09 1982-12-09 Japan Marine Machinery Development Association, Tokyo Kontaktbuerste und verfahren zu ihrer herstellung
US4398113A (en) * 1980-12-15 1983-08-09 Litton Systems, Inc. Fiber brush slip ring assembly
US4415635A (en) * 1980-04-09 1983-11-15 The University Of Virginia Electric brush
US4685236A (en) * 1984-05-30 1987-08-11 Sam May Graphite/metal matrix gun barrel
DE3630919A1 (de) * 1986-09-11 1988-04-07 Harald Haffke Handgeraet zur verzinkung metallischer oberflaechen, insbesonders von karosserien mit hilfe der galvanotechnik ueber eine fahrzeug-stromquelle
WO1988004946A1 (fr) * 1987-01-07 1988-07-14 Kurt Hesse Contacts a frottement pour voiture-jouet a moteur d'entrainement electrique
US4942090A (en) * 1982-03-16 1990-07-17 American Cyanamid Chaff comprising metal coated fibers
US6444102B1 (en) 2000-02-07 2002-09-03 Micro Contacts Inc. Carbon fiber electrical contacts
US6903484B1 (en) * 1999-04-23 2005-06-07 Doris Kuhlmann-Wilsdorf Fluidic pressure holder for electrical metal fiber and foil brushes and ancillary cables
US20050212376A1 (en) * 2004-03-29 2005-09-29 Denso Corporation Brush of rotary electric machine
US20060055276A1 (en) * 2004-09-16 2006-03-16 O'donnell Steven B Keyed motor brushes
US20070120437A1 (en) * 2004-06-18 2007-05-31 Day Michael J Compact slip ring incorporating fiber-on-tips contact technology
US7545073B2 (en) * 2004-06-18 2009-06-09 Moog Inc. Fluid-dispensing reservoir for large-diameter slip rings
US20110067900A1 (en) * 2000-02-07 2011-03-24 Michael Tucci Carbon fiber electrical contacts formed of composite carbon fiber material
US8398413B2 (en) 2000-02-07 2013-03-19 Micro Contacts, Inc. Carbon fiber electrical contacts formed of composite material including plural carbon fiber elements bonded together in low-resistance synthetic resin
US20140179125A1 (en) * 2011-07-13 2014-06-26 Schleifring Und Apparatebau Gmbh Slip Ring Brush Having a Galvanic Multi-Layer System
US10418770B2 (en) 2016-05-31 2019-09-17 Bae Systems Land & Armaments L.P. Multi-directional high current slip ring

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2817371C2 (de) * 1978-04-20 1982-08-12 Siemens AG, 1000 Berlin und 8000 München Stromübertragungsbürste
US4240830A (en) * 1978-11-30 1980-12-23 Westinghouse Electric Corp. Method for making sintered metal-coated graphite for high-current collector brushes
DE2944065A1 (de) * 1979-10-31 1981-05-14 Siemens AG, 1000 Berlin und 8000 München Stromuebertragungsbuerste mit graphitfolien
US5227689A (en) * 1989-08-11 1993-07-13 Mabuchi Motor Co., Ltd. Metal-filled graphite for miniature motors and method of making same

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4226917A (en) * 1977-04-15 1980-10-07 Hitachi, Ltd. Composite joint system including composite structure of carbon fibers embedded in copper matrix
FR2423892A1 (fr) * 1978-04-20 1979-11-16 Siemens Ag Balai transmetteur de courant electrique, a tres faible chute de tension
US4415635A (en) * 1980-04-09 1983-11-15 The University Of Virginia Electric brush
US4398113A (en) * 1980-12-15 1983-08-09 Litton Systems, Inc. Fiber brush slip ring assembly
DE3217217A1 (de) * 1981-05-09 1982-12-09 Japan Marine Machinery Development Association, Tokyo Kontaktbuerste und verfahren zu ihrer herstellung
US4443726A (en) * 1981-05-09 1984-04-17 Toho Beslon Co., Ltd. Brushes and method for the production thereof
US4942090A (en) * 1982-03-16 1990-07-17 American Cyanamid Chaff comprising metal coated fibers
US4685236A (en) * 1984-05-30 1987-08-11 Sam May Graphite/metal matrix gun barrel
DE3630919A1 (de) * 1986-09-11 1988-04-07 Harald Haffke Handgeraet zur verzinkung metallischer oberflaechen, insbesonders von karosserien mit hilfe der galvanotechnik ueber eine fahrzeug-stromquelle
WO1988004946A1 (fr) * 1987-01-07 1988-07-14 Kurt Hesse Contacts a frottement pour voiture-jouet a moteur d'entrainement electrique
EP0277312A1 (de) * 1987-01-07 1988-08-10 Kurt Hesse Schleifkontakt für Spielfahrzeug mit elektrischem Antriebsmotor
US6903484B1 (en) * 1999-04-23 2005-06-07 Doris Kuhlmann-Wilsdorf Fluidic pressure holder for electrical metal fiber and foil brushes and ancillary cables
US20110067900A1 (en) * 2000-02-07 2011-03-24 Michael Tucci Carbon fiber electrical contacts formed of composite carbon fiber material
US8398413B2 (en) 2000-02-07 2013-03-19 Micro Contacts, Inc. Carbon fiber electrical contacts formed of composite material including plural carbon fiber elements bonded together in low-resistance synthetic resin
US8029296B2 (en) 2000-02-07 2011-10-04 Micro Contacts, Inc. Carbon fiber electrical contacts formed of composite carbon fiber material
US6444102B1 (en) 2000-02-07 2002-09-03 Micro Contacts Inc. Carbon fiber electrical contacts
US7138744B2 (en) * 2004-03-29 2006-11-21 Denso Corporation Brush of rotary electric machine
US20050212376A1 (en) * 2004-03-29 2005-09-29 Denso Corporation Brush of rotary electric machine
US7495366B2 (en) * 2004-06-18 2009-02-24 Moog Inc. Compact slip ring incorporating fiber-on-tips contact technology
US7545073B2 (en) * 2004-06-18 2009-06-09 Moog Inc. Fluid-dispensing reservoir for large-diameter slip rings
US20070120437A1 (en) * 2004-06-18 2007-05-31 Day Michael J Compact slip ring incorporating fiber-on-tips contact technology
US20060055276A1 (en) * 2004-09-16 2006-03-16 O'donnell Steven B Keyed motor brushes
US20140179125A1 (en) * 2011-07-13 2014-06-26 Schleifring Und Apparatebau Gmbh Slip Ring Brush Having a Galvanic Multi-Layer System
US9640928B2 (en) * 2011-07-13 2017-05-02 Schleifring Und Apparatebau Gmbh Slip ring brush having a galvanic multi-layer system
US10418770B2 (en) 2016-05-31 2019-09-17 Bae Systems Land & Armaments L.P. Multi-directional high current slip ring

Also Published As

Publication number Publication date
DE2309660A1 (de) 1973-09-06
AU5254773A (en) 1974-08-29
GB1388123A (en) 1975-03-26
CA983561A (en) 1976-02-10
JPS4899602A (cg-RX-API-DMAC7.html) 1973-12-17
FR2174191B1 (cg-RX-API-DMAC7.html) 1976-06-11
IT979591B (it) 1974-09-30
CH551088A (de) 1974-06-28
SE397025B (sv) 1977-10-10
AU476668B2 (en) 1976-09-30
FR2174191A1 (cg-RX-API-DMAC7.html) 1973-10-12

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