EP0107386A1 - Making connections to electrical brushes - Google Patents

Making connections to electrical brushes Download PDF

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Publication number
EP0107386A1
EP0107386A1 EP83305836A EP83305836A EP0107386A1 EP 0107386 A1 EP0107386 A1 EP 0107386A1 EP 83305836 A EP83305836 A EP 83305836A EP 83305836 A EP83305836 A EP 83305836A EP 0107386 A1 EP0107386 A1 EP 0107386A1
Authority
EP
European Patent Office
Prior art keywords
brush
electrical
connector
resistance welded
electrical connector
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.)
Withdrawn
Application number
EP83305836A
Other languages
German (de)
French (fr)
Inventor
Royston Amos Cheesemore
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.)
Morganite Electrical Carbon Ltd
Original Assignee
Morganite Electrical Carbon 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 Morganite Electrical Carbon Ltd filed Critical Morganite Electrical Carbon Ltd
Publication of EP0107386A1 publication Critical patent/EP0107386A1/en
Withdrawn legal-status Critical Current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
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/12—Manufacture of brushes
    • 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
    • H01R39/36—Connections of cable or wire to brush
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections

Definitions

  • This invention relates to a method of making an electrical connection to an electrical brush, being a device for making electrical contact between surfaces in relative motion, which may be a one, two or multiple part carbon or graphite brush.
  • Such brushes are usually formed by blending or mixing fine carbon powders with temporary binders and/or other fillers which may be metallic, plastics or resinous and then compacting the material into pellets of the desired shape and size by means of high pressure hydraulic or mechanical presses. The thus formed compacts, or green brushes, are then heat treated (kilned) in an inert atmosphere. Graphitic brushes are formed by a further heat treatment.
  • a method of making electrical connection to an electrical brush comprises the steps of welding at least one electrical connector to one or more faces of an electrical brush, the brush being of a weldable material, and attaching a flexible current shunt to the connector.
  • weldable brush material should. * contain a minimum of 65% total metal of which a minimum of 50°/ should be copper, the balance being other known metals for use in brushes, such as lead, tin or ferro-manganese alloys.
  • the electrical connector may be a-generally flat metal plate and of a weldable material such as copper, iron or mild steel.
  • the flexible current shunt can be attached by any standard technique of welding, soldering, brazing, crimping, forging or rivetting, depending on the construction of the electrical connector.
  • the electrical connector is resistance welded to the brush, and, in the same operation, the flexible current shunt is resistance welded to the electrical connector.
  • the advantage of the present invention is that a largerarea of contact between the electrical connector and the brush face can be achieved than for a direct welded connection between a current shunt and the brush, which larger area of welded contact provides a stronger connection; ideally a connection produced in accordance with the invention should be capable of achieving a pull strength of 9 Kg.
  • the invention is illustrated by way of example in the drawing which shows an isometric view of the top of an electrical brush with alternative connectors.
  • a typical electrical brush 1 has a top face 2 to which either a chamfered-edged, rectangular electrical connector plate 3 has been resistance welded to the surface of the face 2 or a rectangular electrical connector plate 4 has been resistance welded into a complementary recess 5 in the top face 2 so that the top face of the connector plate is flush with the top face 2 of the brush.
  • Flexible current shunts 6, which may be of copper, aluminium or other suitable material are shown to be simply welded to the top face of either connector-plate 3 or 4.
  • An electrical brush composite having an electrical connector in accordance with the present invention is particularly susceptible to automated production techniques which may, typically, comprise the steps of:-

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Abstract

Displayed herein is a method of making an electrical connector to an electrical brush (1) wherein at least one electrical connector (3,4) is welded to one or more faces (2) of an electrical brush (1) that is formed of a weldable material and a flexible current shunt (6) is attached to the connector (3, 4); in a preferred method, the connector (3, 4) is resistance welded to the brush and the shunt (6) is resistance welded to the connector (3, 4) in the same operation.

Description

  • This invention relates to a method of making an electrical connection to an electrical brush, being a device for making electrical contact between surfaces in relative motion, which may be a one, two or multiple part carbon or graphite brush. Such brushes are usually formed by blending or mixing fine carbon powders with temporary binders and/or other fillers which may be metallic, plastics or resinous and then compacting the material into pellets of the desired shape and size by means of high pressure hydraulic or mechanical presses. The thus formed compacts, or green brushes, are then heat treated (kilned) in an inert atmosphere. Graphitic brushes are formed by a further heat treatment.
  • According to the present invention a method of making electrical connection to an electrical brush comprises the steps of welding at least one electrical connector to one or more faces of an electrical brush, the brush being of a weldable material, and attaching a flexible current shunt to the connector.
  • It is thought that the weldable brush material should.*contain a minimum of 65% total metal of which a minimum of 50°/ should be copper, the balance being other known metals for use in brushes, such as lead, tin or ferro-manganese alloys.
  • The electrical connector may be a-generally flat metal plate and of a weldable material such as copper, iron or mild steel.
  • The flexible current shunt can be attached by any standard technique of welding, soldering, brazing, crimping, forging or rivetting, depending on the construction of the electrical connector.
  • By a preferred embodiment, the electrical connector is resistance welded to the brush, and, in the same operation, the flexible current shunt is resistance welded to the electrical connector.
  • The advantage of the present invention is that a largerarea of contact between the electrical connector and the brush face can be achieved than for a direct welded connection between a current shunt and the brush, which larger area of welded contact provides a stronger connection; ideally a connection produced in accordance with the invention should be capable of achieving a pull strength of 9 Kg.
  • The invention is illustrated by way of example in the drawing which shows an isometric view of the top of an electrical brush with alternative connectors.
  • As shown, a typical electrical brush 1 has a top face 2 to which either a chamfered-edged, rectangular electrical connector plate 3 has been resistance welded to the surface of the face 2 or a rectangular electrical connector plate 4 has been resistance welded into a complementary recess 5 in the top face 2 so that the top face of the connector plate is flush with the top face 2 of the brush.
  • Flexible current shunts 6, which may be of copper, aluminium or other suitable material are shown to be simply welded to the top face of either connector-plate 3 or 4.
  • An electrical brush composite having an electrical connector in accordance with the present invention is particularly susceptible to automated production techniques which may, typically, comprise the steps of:-
    • (1) Pressing a brush to size from the raw material leaving a flush or recessed top face, to accept an electrical connector plate or plates at a later stage, using automatic presses and feeder equipment.
    • (2) Heat treating the thus formed compact either in batches or singly to compound the brush compact.
    • (3) Resistance welding and pressing an electrical connector plate on to or in to the top face of the brush compact.
    • (4) Quality inspecting the heat treated brush.
    • (5) Attaching by various standard engineering methods (preferably resistance welding in the same operation as (3) above) precoated or insulated flexible current shunts and then cutting the flexibles to required length, heat sealing the connection if required.
    • (6) Fitting standard connections to the flexibles, if required.
    • (7) Inspecting the complete assembly.
    • (8) Packaging the complete assembly.

Claims (6)

1. A method of making electrical connection to an electrical brush comprising the steps of welding at least one electrical connector to one or more faces of an electrical brush, the brush being of a weldable material, and attaching a flexible current shunt to the connector.
2. A method as claimed in claim 1, wherein said weldable brush material contains a minimum of 65% total metal content of which a minimum of 50% is copper.
3. A method as claimed in claim 1 or claim 2, wherein the connector plate is resistance welded to the brush face.
4. A method as claimed in claim 3, wherein the flexible current shunt is resistance welded to the connector plate in the same operation.
5. A method of making electrical connection to an electrical brush substantially as described with reference to the drawing.
6. An electrical brush made by the method of any of claims 1 to 5.
EP83305836A 1982-09-30 1983-09-28 Making connections to electrical brushes Withdrawn EP0107386A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8228012 1982-09-30
GB8228012 1982-09-30

Publications (1)

Publication Number Publication Date
EP0107386A1 true EP0107386A1 (en) 1984-05-02

Family

ID=10533291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83305836A Withdrawn EP0107386A1 (en) 1982-09-30 1983-09-28 Making connections to electrical brushes

Country Status (1)

Country Link
EP (1) EP0107386A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5746616A (en) * 1993-09-24 1998-05-05 Pacesetter, Inc. Defibrillation electrode connection
CN101783473A (en) * 2008-11-28 2010-07-21 申克碳化技术股份有限公司 Carbon brush for transferring high currents
DE102018221927A1 (en) * 2018-12-17 2020-06-18 Robert Bosch Gmbh Device for measuring current with CNB fibers
WO2023186306A1 (en) * 2022-03-31 2023-10-05 Schunk Kohlenstofftechnik Gmbh Contact piece and method for production

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067319A (en) * 1959-11-10 1962-12-04 Air Reduction Metal-graphite brush with welded shunt
US3067318A (en) * 1959-11-10 1962-12-04 Air Reduction Metal-graphite brush with brazed shunt

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067319A (en) * 1959-11-10 1962-12-04 Air Reduction Metal-graphite brush with welded shunt
US3067318A (en) * 1959-11-10 1962-12-04 Air Reduction Metal-graphite brush with brazed shunt

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5746616A (en) * 1993-09-24 1998-05-05 Pacesetter, Inc. Defibrillation electrode connection
CN101783473A (en) * 2008-11-28 2010-07-21 申克碳化技术股份有限公司 Carbon brush for transferring high currents
US8847463B2 (en) 2008-11-28 2014-09-30 Schunk Kohlenstofftechnik Gmbh Carbon brush for transmitting high currents
DE102018221927A1 (en) * 2018-12-17 2020-06-18 Robert Bosch Gmbh Device for measuring current with CNB fibers
WO2023186306A1 (en) * 2022-03-31 2023-10-05 Schunk Kohlenstofftechnik Gmbh Contact piece and method for production

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19841103

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CHEESEMORE, ROYSTON AMOS