With Composition Feature Patents (Class 310/252)
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Patent number: 5701046Abstract: The process comprising the charging into a mould (3) of at least one electrically conductive powder (4), the compression by means of a piston (5) of the contents of the mould to form a crude brush (7), the heat treatment of said crude brush (7) as well as the fixing of the ends of the electrical conductors (2), characterised in that the charging involves at least the simultaneous introduction of at least two conductive powders (4B, 4A and/or 4C . . . ) for obtaining a brush formed by integral blocks (1B, 1A and/or 1C . . . ), the junction (1AB and/or 1BC . . . ) between said blocks being orientated at least in part in the compression direction (13).Type: GrantFiled: August 16, 1994Date of Patent: December 23, 1997Assignee: Le Carbone LorraineInventors: Eric Kammerer, Lothar Biering, Erhard Grohs, Klaus Groht, Conrad Reynvaan, Horst Siegmund, Jorgen Spangenberg, Arwed Uecker
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Patent number: 5481150Abstract: A binded carbon brush includes a brush main portion formed mainly of carbon, and an electric conductor formed by a material, such as a copper powder, having an electric resistivity lower than that of the brush main portion and extending along a main current direction of the brush. In the cross section of the brush perpendicular to the main current direction, the diameter or the vertical and horizontal sizes of the conductor is so set as to be smaller than both the vertical and horizontal sizes of the brush main portion.Type: GrantFiled: May 4, 1994Date of Patent: January 2, 1996Assignee: Kabushiki Kaisha TecInventors: Motoyuki Tanaka, Yasunori Hatano, Tadashi Ozawa
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Patent number: 5387832Abstract: A binded carbon brush includes a brush main portion formed mainly of carbon, and an electric conductor formed by a material, such as a copper powder, having an electric resistivity lower than that of the brush main portion and extending along a main current direction of the brush. In the cross section of the brush perpendicular to the main current direction, the diameter or the vertical and horizontal sizes of the conductor is so set as to be smaller than both the vertical and horizontal sizes of the brush main portion.Type: GrantFiled: April 22, 1992Date of Patent: February 7, 1995Assignee: Tokyo Electric Co., Ltd.Inventors: Motoyuki Tanaka, Yasunori Hatano, Tadashi Ozawa, Tatsuya Ikegami, Hiroyuki Yoshizawa
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Patent number: 5365136Abstract: Brush for electric motors obtained by compression of an electrically conductive powder containing one end of an electrical conductor so as simultaneously to allow the formation of the brush and the mechanical fixing of said electrical conductor, and characterized in that the density of at least a portion of the compressed powder in contact with the end of the immersed electrical conductor is higher than the mean density of the compressed powder so as to improve the strength of said mechanical fixing when said brush is subjected to vibrations.Type: GrantFiled: May 3, 1993Date of Patent: November 15, 1994Assignee: Le Carbone LorraineInventor: Jean-Bernard Deboves
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Patent number: 5227689Abstract: A metal-filled gaphite brush used for a miniature motor, which has a permanent magnet field and is caused to rotate through current commutation via a commutator, formed by bonding graphite powder and used for making sliding contact with the commutator for current commutation, in which the metal-filled graphite brush is formed by pressure-forming and sintering a mixture of highly purified graphite powder and metal powder; the graphite powder used for the metal-filled graphite brush being purified to reduce the ash content thereof 0.05 wt. %, and the method of making the same.Type: GrantFiled: August 7, 1990Date of Patent: July 13, 1993Assignee: Mabuchi Motor Co., Ltd.Inventor: Isao Shibuya
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Patent number: 5144181Abstract: A carbon brush for miniature motors comprising a stator using a permanent magnet as the field, and a rotor on which a rotor winding is wound, and having a commutator for feeding current to the rotor winding and brushes, formed by bonding graphite powder, for making sliding contact with the commutator; the brush being a metal-plated graphite brush formed by adding 0.1 wt. % to 12.0 wt. % of a fibrous material of particle sizes less than 40 microns and lengths less than 50 microns to metal-plated graphite powder formed by coating graphite powder with a metallic layer, and pressure-forming and sintering a mixture of the metal-plated graphite powder and the fibrous material; the graphite powder containing less than 0.05 wt. % of ashes, and the method of making the same.Type: GrantFiled: March 14, 1991Date of Patent: September 1, 1992Assignee: Mabuchi Motor Co., Ltd.Inventor: Isao Shibuya
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Patent number: 5136198Abstract: A carbon brush used for a miniature motor, which has a permanent magnet field and is caused to rotate through current commutation via a commutator, formed by bonding graphite powder and used for making sliding contact with the commutator for current commutation, in which the carbon brush is a metal-plated graphite brush formed by pressure-forming and sintering the graphite powder after covering particles of the graphite powder with a metallic layer; the graphite powder used for the metal-plated graphite brush being purified to reduce the ash content of the graphite powder to 0.05 wt. %, and the method of making the same.Type: GrantFiled: April 5, 1990Date of Patent: August 4, 1992Assignee: Mabuchi Motor Co., Ltd.Inventor: Isao Shibuya
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Patent number: 4605581Abstract: A carbon current collection brush having improved wear characteristics and exhibiting a relatively low coefficient of friction at its sliding contact surface (e.g., with a commutator or slip ring) is made by impregnating a brush blank with a solution containing an organometallic compound and an organic resin. The thereby impregnated brush blank is then cured to remove volatiles and retain approximately one to nine percent, by weight, of the organometallic compound and the organic resin in the brush blank.Type: GrantFiled: August 20, 1985Date of Patent: August 12, 1986Assignee: General Electric CompanyInventors: Robert W. Stevens, Mark Markovitz
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Patent number: 4415635Abstract: A multifiber electrical brush formed of an electrically conductive matrix material having plural electrically conducting fiber wires embedded therein and extending therefrom, wherein the fiber wires have a diameter varying from 1 to 120.mu.m, a length on the order of 100 times greater than the diameter thereof, and a packing density between 1-25%. Suitable materials for the fiber wires are platinum, gold, silver, copper, palladium, or niobium which may be embedded in a copper, silver, or other suitable matrix material, or copper embedded in an aluminum matrix. The fiber wires may be provided with a coating of a suitable barrier material on the lateral surfaces thereof as may be required to protect the fiber wires from etching during removal of the matrix material, or to prevent and/or retard interdiffusion between the matrix material and the fiber wire material during annealing or hot-forming of brush stock, and/or to impart improved electrical performance to the resultant electrical brush.Type: GrantFiled: April 9, 1980Date of Patent: November 15, 1983Assignee: The University of VirginiaInventors: Doris Wilsdorf, Heinz G. F. Wilsdorf, Charles M. Adkins, III
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Patent number: 4337407Abstract: A brush having at least a portion thereof adjacent the trailing end made up of a plurality of individually insulated strands of highly conductive material.Type: GrantFiled: April 29, 1980Date of Patent: June 29, 1982Assignee: Westinghouse Electric Corp.Inventor: George T. Hummert
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Patent number: 4277708Abstract: A high-current electrical machine, comprises a stationary and a moving member and at least one current collector brush disposed between the members and in frictional contact with one member; where the brush comprises a plurality of flexurally independent, metal fibers, and where a non-oxidizing gaseous medium containing water vapor, contacts the interface of frictional contact of the brush to provide a lubricating effect.Type: GrantFiled: June 25, 1979Date of Patent: July 7, 1981Assignee: Westinghouse Electric Corp.Inventors: Ian R. McNab, Philip Reichner
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Patent number: 4131460Abstract: A method of producing a sintered composition used as a brush for a dynamo electric machine, includes the steps of compacting a powder from which the brush is to be made around one end of an electrical lead with the remainder of the lead projecting from the compacted powder, and then heating in a non-reducing atmosphere the assembly of the lead and the compacted powder to sinter the powder into the required brush and physically electrically connect the lead to the brush.Type: GrantFiled: March 17, 1977Date of Patent: December 26, 1978Assignee: Lucas Industries LimitedInventor: Raymond L. Orford
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Patent number: 4101453Abstract: A sintered composition used as a brush for a dynamo electric machine contains copper, carbon and silicon carbide.Type: GrantFiled: March 14, 1977Date of Patent: July 18, 1978Assignee: Lucas Industries LimitedInventors: Raymond Leslie Orford, Dexter William Smith
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Patent number: 4000430Abstract: A contact brush made in the form of a lamination composed of electroconductive foil laminae joined together with an adhesive on the base of a polymeric binder. As a binder use may be made of thermoreactive polymeric resins filled with colloidal metal particles, antifrictional and polish-forming admixtures which impart electric conductivity, high wear resistance and electric contact stability to the adhesive under conditions of elevated humidity and in a vacuum.The contact brush is intended for use in electrical machines, in particular, electric fractional horsepower motors, measuring potentiometers, start-control devices and the like where it is necessary to provide for a reliable and highly stable sliding electric contact.Type: GrantFiled: February 13, 1973Date of Patent: December 28, 1976Inventors: Vladimir Alexeevich Bely, Feliks Georgievich Ivannikov, Viktor Mikhailovich Kenko, Evald Akimovich Lodochnikov, Valentin Georgievich Savkin, Anatoly Ivanovich Sviridenok
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Patent number: 3996408Abstract: The present invention relates to heavy-current electrical engineering, and more particularly to carbon-graphite brushes characterized by high wear resistance and low adhesive capacity of the brush dust, said brushes being intended for operation in commutator machines under moderate or heavy commutation conditions at an operating temperature of the sliding contact from 200.degree. to 250.degree. C, and to a method for manufacturing same.Carbon-graphite brushes for electric machines are made of a material which, after impregnation and heat treatment of the organic impregnation compound contains a dry residue evenly distributed through out the entire bulk volume thereof, the dry residue being a mixture of melamine-glyptal resin with a metal linoleate, in a polymerized state.Type: GrantFiled: February 28, 1975Date of Patent: December 7, 1976Inventors: Georgy Nikolaevich Fridman, Jury Nikolaevich Vasiliev, Abram Samoilovich Fialkov, Yakov Gilievich Davidovich, Abram Yakovlevich Gluskin, Anatoly Alexandrovich Kozyrev, Roza Petrovna Batyreva, Evgeny Mikhailovich Kozlov, Anatoly Alexeevich Boiko, Olga Borisovna Kazakova, Nadezhda Vasilievna Kalinina, Valentina Mikhailovna Emelyanova, Igor Vyacheslavovich Yartsev