US3668451A - Electrical brush structure - Google Patents
Electrical brush structure Download PDFInfo
- Publication number
- US3668451A US3668451A US64550A US3668451DA US3668451A US 3668451 A US3668451 A US 3668451A US 64550 A US64550 A US 64550A US 3668451D A US3668451D A US 3668451DA US 3668451 A US3668451 A US 3668451A
- Authority
- US
- United States
- Prior art keywords
- brush
- fibers
- current
- current transfer
- metallic
- 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
Links
- 239000000835 fiber Substances 0.000 claims abstract description 34
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920000914 Metallic fiber Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
Definitions
- a current transfer brush for an electrical machine consists of refractory fibers, such as aluminum oxide fibers, with a deposited metallic film.
- the fibers provide mechanical strength with flexibility while the metallic films carry the current and high current densities can be achieved with low wear rates for the brushes and the contact surface which they traverse.
- a brush composed of individual resilient wires each of which consists of a tubular metal sheath having a core of graphite or other lubricant material in powdered form which serves to prevent welding of the wire to the slip ring or other current transfer surface and reduces friction while maintaining electrical contact.
- the metal tube which forms 40 percent or more or the cross-sectional area of the wire, provides both the electrical conductivity and the mechanical strength of the wire. Because of the overall diameter and thickness of the tube it is relatively stiff and requires a large contact pressure which gives rise to substantial wear both of the brush wires and of the current transfer surface with which they are in contact. Also the relatively small number of wires in a brush means that the absence of adequate contact between one or two wires and the current transfer surface will cause a noticeable irregularity in the current-carrying capacity of the brush.
- the brush elements of refractory non-conducting fibers which provide high Strength and flexibility, each of the fibers having a metallic film deposited' on the surface thereof to carry the current. Since the current is carried by the metallic film it is not necessary for the refractory non-metallic fiber to be electrically conductive. It is therefore possible to use fibers of boron nitride or refractory metal oxides such as aluminum oxide and even glass fibers. These fibers can be of very small diameter, less than thousandths of an inch, and with a relatively thin metallic coating are much less stiff than the metallic tubes of U.S. Pat. No. 3,382,387 referred to above and therefore require less contact pressure. Moreover the use of a large number of metal-coated fibers makes for greater uniformity in the current carrying capacity of the brush despite variation s in the degree of contact of individual elements of the brush with the contact surface.
- the electrically-conducting metal film is preferably formed of a noble metal such as silver, or may take the form of an alloy of a noble metal and a metal such as copper. It may be applied to the fibers by electro-plating, vacuum deposition or any other suitable process.
- one or more brushes constructed in accordance with the invention are used in conjunction with a surface moving relatively to the brush and to orfrom which the brush transfers current, the surface being constructed of a material having a lubricating effect such as, for example, graphite or metal-graphite composite materials.
- the moving surface may comprise a conventional metallic material, such as copper or steel, in which case a suitable lubricant, such as molybdenum disulphide or graphite, is employed to reduce friction between the brush and the moving surface.
- the moving surface may be metal with a surface coating of silver or other noble metal.
- an alloy of two or more metals may be employed, for example, silver alloyed with copper.
- FIG. 1 is a cross-section of part of an electrical machine showing a fiber type of brush in accordance with one embodiment of the present invention in contact with a moving conductor.
- FIG. 2 shows an individual fiber of the brush of FIG. 1 provided with a metallic coating.
- an electrical machine comprises a brush 1 for current transfer purposes in contact with the surface 2 of an electrically conducting member 3.
- the member 3 may comprise, for example, a slip-ring or commutator segment in a dynarnoelectric machine, or alternatively it may comprise a continuous rail from which the brush 1 collects current for, say, traction purposes in vehicle systems.
- Brush 1 comprises a plurality of fibers 4 retained in mutual contact with each other along substantially their entire length by a casing 5 of metallic material.
- a braid 6 of electrically conductive material carries current to or from the brush to windings or temrinals of the machine.
- FIG. 2 shows one of the fibers 4, which is a non-metallic refractory fiber, provided with a metallic film 7 extending over the whole peripheral surface of the fiber along its full length.
- the metallic film is of silver.
- each fiber is less than 10 thousandths of an inch and the thickness of the metallic coating is typically 06 thousandths of an inch and generally no more than one tenth of the diameter of the fiber.
- Fibers of boron nitride or aluminum oxide can be fonned as coherent high strength fibers by methods similar to the method described in The Engineer" Vol. 221, 27th May 1966, Page 815, by W. West, L.N. Philips, and W. Johnston, under the title High strength, high modulus, carbon fibers" and in British Patent No. l ,l 10,791.
- Brushes of the kind described can be used for current densities of the order of 1,000 amps per square inch and with relative speeds of movement between the brushes and the current transfer surface of as much as 18,000 ft/min.
- the brush wear can be as little as 1 cm for 10 cm of travel of the brushes over the surface and the wear of the surface itself is of the same order of magnitude, being less than 1 mm for 3 X 10 cms of relative movement of the bnrsh and the current transfer surface.
- the casing 5 clamps the metal coated fibers in mutual contact over a major part of their length and thus maintains electrical continuity between them.
- the fibers may alternatively be joined to each other along a portion of their length by welding together of their metallic films. It is important however that the ends of the filaments which engage the current transfer surface should be free to flex individually in the manner of the bristles of a brush.
- the electrical connecting braid 6 may be soldered, welded or rivetted to the casing 5, or alternatively it may be directly joined to the fibers using soldering, welding or other suitable methods.
- the brush may be held in a conventional brush holder allowing it to be held against the surface 2 under the action of a spring.
- a current transfer brush for an electrical machine comprising a plurality of refractory non-conducting fibers extending generally parallel to one another, each of said fibers having a metallic film deposited thereon, said film extending along the length of the fiber.
- each of said fibers has a diameter less than 10 thousandths of an inch.
- a brush as claimed in claim 1 having means holding said fibers with their metallic films in mutual contact.
- a current transfer brush as claimed in claim 5 in which the surface of the contact member is composed of graphite or a metal-graphite composite material having a lubricating effect.
Landscapes
- Motor Or Generator Current Collectors (AREA)
Abstract
A current transfer brush for an electrical machine consists of refractory fibers, such as aluminum oxide fibers, with a deposited metallic film. The fibers provide mechanical strength with flexibility while the metallic films carry the current and high current densities can be achieved with low wear rates for the brushes and the contact surface which they traverse.
Description
United States Patent McNab [54] ELECTRICAL BRUSH STRUCTURE [72] Inventor: Ian Roderick McNab, Fossway, Newcastle upon Tyne, 6, England [22] Filed: Aug. 14, 1970 [21] Appl. No.: 64,550
[52] US. Cl .......310/248, 310/251 [5 1] Int. (I .110lr39/l8 [58] Field of Search 310/2 19, 231, 239, 248-253 [56] References Cited UNITED STATES PATENTS 539,454 5/1895 Thomson ...310/248 3,153,163 10/1964 Foldesetal ..3l0/23l 1 June 6, 1972 539,453 5/1895 Thomson ..3 10/248 3,382,387 5/1968 Marshall ..3 10/2 1 9 3,525,006 8/1970 Parr et al. ..3 10/251 Primary Examiner-D. F. Duggan Attomey-Kemon, Palmer & Estabrook 1 1 ABSTRACT A current transfer brush for an electrical machine consists of refractory fibers, such as aluminum oxide fibers, with a deposited metallic film. The fibers provide mechanical strength with flexibility while the metallic films carry the current and high current densities can be achieved with low wear rates for the brushes and the contact surface which they traverse.
6 Claims, 2 Drawing Figures ELECTRICAL BRUSH STRUCTURE The invention relates to current transfer brushes for electri cal machines.
It is necessary in many electrical machines to provide an electrically conducting path between two parts of a machine moving relative to one another. In dynamo-electric machines, for example, it is common to use brushes of electrically conducting material sliding on the surface of a slip-ring or commutator to provide a current path between the rotor and an external connection. The principal requirements of such brushes are that they should be able to carry a high current per unit area of interface between the brush and the surface which it contacts and that they should have high wear resistance.
It has been proposed in US. Pat. No. 3,382,387 to use a brush composed of individual resilient wires each of which consists of a tubular metal sheath having a core of graphite or other lubricant material in powdered form which serves to prevent welding of the wire to the slip ring or other current transfer surface and reduces friction while maintaining electrical contact. The metal tube, which forms 40 percent or more or the cross-sectional area of the wire, provides both the electrical conductivity and the mechanical strength of the wire. Because of the overall diameter and thickness of the tube it is relatively stiff and requires a large contact pressure which gives rise to substantial wear both of the brush wires and of the current transfer surface with which they are in contact. Also the relatively small number of wires in a brush means that the absence of adequate contact between one or two wires and the current transfer surface will cause a noticeable irregularity in the current-carrying capacity of the brush.
In accordance with the present invention it is proposed to form the brush elements of refractory non-conducting fibers which provide high Strength and flexibility, each of the fibers having a metallic film deposited' on the surface thereof to carry the current. Since the current is carried by the metallic film it is not necessary for the refractory non-metallic fiber to be electrically conductive. It is therefore possible to use fibers of boron nitride or refractory metal oxides such as aluminum oxide and even glass fibers. These fibers can be of very small diameter, less than thousandths of an inch, and with a relatively thin metallic coating are much less stiff than the metallic tubes of U.S. Pat. No. 3,382,387 referred to above and therefore require less contact pressure. Moreover the use of a large number of metal-coated fibers makes for greater uniformity in the current carrying capacity of the brush despite variation s in the degree of contact of individual elements of the brush with the contact surface.
The electrically-conducting metal film is preferably formed of a noble metal such as silver, or may take the form of an alloy of a noble metal and a metal such as copper. It may be applied to the fibers by electro-plating, vacuum deposition or any other suitable process.
According to a further feature of the invention one or more brushes constructed in accordance with the invention are used in conjunction with a surface moving relatively to the brush and to orfrom which the brush transfers current, the surface being constructed of a material having a lubricating effect such as, for example, graphite or metal-graphite composite materials. Alternatively, the moving surface may comprise a conventional metallic material, such as copper or steel, in which case a suitable lubricant, such as molybdenum disulphide or graphite, is employed to reduce friction between the brush and the moving surface. Alternatively. the moving surface may be metal with a surface coating of silver or other noble metal. Alternatively an alloy of two or more metals may be employed, for example, silver alloyed with copper.
The invention will be further described with reference to the accompanying drawing in which:
FIG. 1 is a cross-section of part of an electrical machine showing a fiber type of brush in accordance with one embodiment of the present invention in contact with a moving conductor.
FIG. 2 shows an individual fiber of the brush of FIG. 1 provided with a metallic coating.
Referring to FIG. 1, an electrical machine comprises a brush 1 for current transfer purposes in contact with the surface 2 of an electrically conducting member 3. The member 3 may comprise, for example, a slip-ring or commutator segment in a dynarnoelectric machine, or alternatively it may comprise a continuous rail from which the brush 1 collects current for, say, traction purposes in vehicle systems.
Brush 1 comprises a plurality of fibers 4 retained in mutual contact with each other along substantially their entire length by a casing 5 of metallic material. A braid 6 of electrically conductive material carries current to or from the brush to windings or temrinals of the machine.
FIG. 2 shows one of the fibers 4, which is a non-metallic refractory fiber, provided with a metallic film 7 extending over the whole peripheral surface of the fiber along its full length. In this instance the the metallic film is of silver.
The diameter of each fiber is less than 10 thousandths of an inch and the thickness of the metallic coating is typically 06 thousandths of an inch and generally no more than one tenth of the diameter of the fiber.
Fibers of boron nitride or aluminum oxide can be fonned as coherent high strength fibers by methods similar to the method described in The Engineer" Vol. 221, 27th May 1966, Page 815, by W. West, L.N. Philips, and W. Johnston, under the title High strength, high modulus, carbon fibers" and in British Patent No. l ,l 10,791.
Brushes of the kind described can be used for current densities of the order of 1,000 amps per square inch and with relative speeds of movement between the brushes and the current transfer surface of as much as 18,000 ft/min. The brush wear can be as little as 1 cm for 10 cm of travel of the brushes over the surface and the wear of the surface itself is of the same order of magnitude, being less than 1 mm for 3 X 10 cms of relative movement of the bnrsh and the current transfer surface.
The casing 5 clamps the metal coated fibers in mutual contact over a major part of their length and thus maintains electrical continuity between them. The fibers may alternatively be joined to each other along a portion of their length by welding together of their metallic films. It is important however that the ends of the filaments which engage the current transfer surface should be free to flex individually in the manner of the bristles of a brush.
The electrical connecting braid 6 may be soldered, welded or rivetted to the casing 5, or alternatively it may be directly joined to the fibers using soldering, welding or other suitable methods. The brush may be held in a conventional brush holder allowing it to be held against the surface 2 under the action of a spring.
WE CLAIM:
l. A current transfer brush for an electrical machine comprising a plurality of refractory non-conducting fibers extending generally parallel to one another, each of said fibers having a metallic film deposited thereon, said film extending along the length of the fiber.
2. A current transfer brush as claimed in claim 1 in which each of said fibers has a diameter less than 10 thousandths of an inch.
3. A brush as claimed in claim 1 having means holding said fibers with their metallic films in mutual contact.
4. A brush as claimed in claim 3 in which said holding means comprises a metallic casing surrounding the fibers at one end thereof.
5. A current transfer brush as claimed in claim 1 in combination with a movable contact member having a lubricated surface.
6. A current transfer brush as claimed in claim 5 in which the surface of the contact member is composed of graphite or a metal-graphite composite material having a lubricating effect.
I '0 II I
Claims (5)
- 2. A current transfer brush as claimed in claim 1 in which each of said fibers has a diameter less than 10 thousandths of an inch.
- 3. A brush as claimed in claim 1 having means holding said fibers with their metallic films in mutual contact.
- 4. A brush as claimed in claim 3 in which said holding means comprises a metallic casing surrounding the fibers at one end thereof.
- 5. A current transfer brush as claimed in claim 1 in combination with a movable contact member having a lubricated surface.
- 6. A current transfer brush as claimed in claim 5 in which the surface of the contact member is composed of graphite or a metal-graphite composite material having a lubricating effect.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US6455070A | 1970-08-14 | 1970-08-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3668451A true US3668451A (en) | 1972-06-06 |
Family
ID=22056746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US64550A Expired - Lifetime US3668451A (en) | 1970-08-14 | 1970-08-14 | Electrical brush structure |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3668451A (en) |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3818588A (en) * | 1972-03-30 | 1974-06-25 | Nat Res Dev | Electrical brushes |
| US3826379A (en) * | 1973-02-28 | 1974-07-30 | W Wright | Method and means for reducing the effect of electrostatic charges on paper in a copying system |
| US3886386A (en) * | 1973-08-01 | 1975-05-27 | Gen Electric | Carbon fiber current collection brush |
| US4000430A (en) * | 1973-02-13 | 1976-12-28 | Vladimir Alexeevich Bely | Contact brush |
| US4071795A (en) * | 1975-09-02 | 1978-01-31 | International Research & Development Company Limited | Brush gear for electrical machinery |
| DE3006330A1 (en) * | 1979-06-25 | 1981-01-29 | Westinghouse Electric Corp | ELECTRIC HIGH CURRENT MACHINE |
| US4267476A (en) * | 1979-06-25 | 1981-05-12 | Westinghouse Electric Corp. | Metal-solid lubricant brushes for high-current rotating electrical machinery |
| US4306169A (en) * | 1978-04-20 | 1981-12-15 | Siemens Aktiengesellschaft | Current transfer brush |
| US4361775A (en) * | 1978-04-20 | 1982-11-30 | Siemens Aktiengesellschaft | Current transfer brush |
| US4398113A (en) * | 1980-12-15 | 1983-08-09 | Litton Systems, Inc. | Fiber brush slip ring assembly |
| US4443726A (en) * | 1981-05-09 | 1984-04-17 | Toho Beslon Co., Ltd. | Brushes and method for the production thereof |
| US4576082A (en) * | 1982-12-23 | 1986-03-18 | Westinghouse Electric Corp. | Linear fiber armature for electromagnetic launchers |
| US4587723A (en) * | 1985-05-02 | 1986-05-13 | The United States Of America As Represented By The Secretary Of The Navy | Method for making a high current fiber brush collector |
| US5177529A (en) * | 1988-11-25 | 1993-01-05 | Xerox Corporation | Machine with removable unit having two element electrical connection |
| FR2743203A1 (en) * | 1995-12-30 | 1997-07-04 | Bosch Gmbh Robert | CARBON BROOM FOR ELECTRIC MOTORS |
| US6400057B2 (en) * | 2000-02-25 | 2002-06-04 | Sgl Carbon Ag | Slip-ring configuration in electric motors and generators, slip-ring body and method for retooling slip-ring bodies |
| US6444102B1 (en) | 2000-02-07 | 2002-09-03 | Micro Contacts Inc. | Carbon fiber electrical contacts |
| DE102005013106A1 (en) * | 2005-03-18 | 2006-09-21 | Gerhard Präzisionspresstechnik GmbH | Carbon brush arrangement for e.g. washing machine motors has latch plates fixed to mounting plate and separated by air gaps |
| 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 |
| EP1766761A4 (en) * | 2004-06-18 | 2013-01-02 | Moog Inc | Electrical contact technology and methodology for the manufacture of large-diameter electrical slip rings |
| 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 |
| US20130210243A1 (en) * | 2010-10-26 | 2013-08-15 | Nicolas Argibay | Long-life metal sliding contacts |
| US10418770B2 (en) | 2016-05-31 | 2019-09-17 | Bae Systems Land & Armaments L.P. | Multi-directional high current slip ring |
| US20230216250A1 (en) * | 2022-01-05 | 2023-07-06 | Tk Elevator Innovation And Operations Gmbh | Grounding assemblies for an elevator assembly |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US539454A (en) * | 1895-05-21 | Carbon brush | ||
| US539453A (en) * | 1895-05-21 | Carbon brush | ||
| US3153163A (en) * | 1961-03-30 | 1964-10-13 | Gen Electric | Moving electric current collectors |
| US3382387A (en) * | 1968-05-07 | Gen Electric | Electrical current collection and delivery method and apparatus | |
| US3525006A (en) * | 1968-02-29 | 1970-08-18 | Nat Res Dev | Carbon fibre brush |
-
1970
- 1970-08-14 US US64550A patent/US3668451A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US539454A (en) * | 1895-05-21 | Carbon brush | ||
| US539453A (en) * | 1895-05-21 | Carbon brush | ||
| US3382387A (en) * | 1968-05-07 | Gen Electric | Electrical current collection and delivery method and apparatus | |
| US3153163A (en) * | 1961-03-30 | 1964-10-13 | Gen Electric | Moving electric current collectors |
| US3525006A (en) * | 1968-02-29 | 1970-08-18 | Nat Res Dev | Carbon fibre brush |
Cited By (31)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3818588A (en) * | 1972-03-30 | 1974-06-25 | Nat Res Dev | Electrical brushes |
| US4000430A (en) * | 1973-02-13 | 1976-12-28 | Vladimir Alexeevich Bely | Contact brush |
| US3826379A (en) * | 1973-02-28 | 1974-07-30 | W Wright | Method and means for reducing the effect of electrostatic charges on paper in a copying system |
| US3886386A (en) * | 1973-08-01 | 1975-05-27 | Gen Electric | Carbon fiber current collection brush |
| US4071795A (en) * | 1975-09-02 | 1978-01-31 | International Research & Development Company Limited | Brush gear for electrical machinery |
| US4306169A (en) * | 1978-04-20 | 1981-12-15 | Siemens Aktiengesellschaft | Current transfer brush |
| US4361775A (en) * | 1978-04-20 | 1982-11-30 | Siemens Aktiengesellschaft | Current transfer brush |
| US4267476A (en) * | 1979-06-25 | 1981-05-12 | Westinghouse Electric Corp. | Metal-solid lubricant brushes for high-current rotating electrical machinery |
| DE3006330A1 (en) * | 1979-06-25 | 1981-01-29 | Westinghouse Electric Corp | ELECTRIC HIGH CURRENT MACHINE |
| US4398113A (en) * | 1980-12-15 | 1983-08-09 | Litton Systems, Inc. | Fiber brush slip ring assembly |
| US4443726A (en) * | 1981-05-09 | 1984-04-17 | Toho Beslon Co., Ltd. | Brushes and method for the production thereof |
| US4576082A (en) * | 1982-12-23 | 1986-03-18 | Westinghouse Electric Corp. | Linear fiber armature for electromagnetic launchers |
| US4587723A (en) * | 1985-05-02 | 1986-05-13 | The United States Of America As Represented By The Secretary Of The Navy | Method for making a high current fiber brush collector |
| US5177529A (en) * | 1988-11-25 | 1993-01-05 | Xerox Corporation | Machine with removable unit having two element electrical connection |
| FR2743203A1 (en) * | 1995-12-30 | 1997-07-04 | Bosch Gmbh Robert | CARBON BROOM FOR ELECTRIC MOTORS |
| US6444102B1 (en) | 2000-02-07 | 2002-09-03 | Micro Contacts Inc. | Carbon fiber electrical contacts |
| 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 |
| US20110067900A1 (en) * | 2000-02-07 | 2011-03-24 | Michael Tucci | Carbon fiber electrical contacts formed of composite carbon fiber material |
| US8029296B2 (en) | 2000-02-07 | 2011-10-04 | Micro Contacts, Inc. | Carbon fiber electrical contacts formed of composite carbon fiber material |
| US6400057B2 (en) * | 2000-02-25 | 2002-06-04 | Sgl Carbon Ag | Slip-ring configuration in electric motors and generators, slip-ring body and method for retooling slip-ring bodies |
| EP1766761A4 (en) * | 2004-06-18 | 2013-01-02 | Moog Inc | Electrical contact technology and methodology for the manufacture of large-diameter electrical slip rings |
| US20070120437A1 (en) * | 2004-06-18 | 2007-05-31 | Day Michael J | Compact slip ring incorporating fiber-on-tips contact technology |
| 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 |
| DE102005013106B4 (en) * | 2005-03-18 | 2012-02-02 | Gerhard Präzisionspresstechnik GmbH | Carbon brush assembly |
| DE102005013106A1 (en) * | 2005-03-18 | 2006-09-21 | Gerhard Präzisionspresstechnik GmbH | Carbon brush arrangement for e.g. washing machine motors has latch plates fixed to mounting plate and separated by air gaps |
| US20130210243A1 (en) * | 2010-10-26 | 2013-08-15 | Nicolas Argibay | Long-life metal sliding contacts |
| US9450366B2 (en) * | 2010-10-26 | 2016-09-20 | University Of Florida Research Foundation, Inc. | Long-life metal sliding contacts |
| US10418770B2 (en) | 2016-05-31 | 2019-09-17 | Bae Systems Land & Armaments L.P. | Multi-directional high current slip ring |
| US20230216250A1 (en) * | 2022-01-05 | 2023-07-06 | Tk Elevator Innovation And Operations Gmbh | Grounding assemblies for an elevator assembly |
| US12113316B2 (en) * | 2022-01-05 | 2024-10-08 | Tk Elevator Innovation And Operations Gmbh | Grounding assemblies for an elevator assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: NORTHERN ENGINEERING INDUSTRIES LIMITED, NEI HOUSE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:JOHN THOMPSON (PIPEWORK AND ORDANCE DIVISION LIMITED);REEL/FRAME:003864/0376 Effective date: 19801208 |
|
| AS | Assignment |
Owner name: NORTHERN ENGINEERING INDUSTRIES PLC. Free format text: CHANGE OF NAME;ASSIGNOR:NORTHERN ENGINEERING INDUSTRIES LIMITED;REEL/FRAME:004101/0161 Effective date: 19821124 |