EP0044113A1 - Bürstenhalter eines Elektromotors - Google Patents

Bürstenhalter eines Elektromotors Download PDF

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Publication number
EP0044113A1
EP0044113A1 EP19810200790 EP81200790A EP0044113A1 EP 0044113 A1 EP0044113 A1 EP 0044113A1 EP 19810200790 EP19810200790 EP 19810200790 EP 81200790 A EP81200790 A EP 81200790A EP 0044113 A1 EP0044113 A1 EP 0044113A1
Authority
EP
European Patent Office
Prior art keywords
tube
electrode
section
spring
brush holder
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.)
Granted
Application number
EP19810200790
Other languages
English (en)
French (fr)
Other versions
EP0044113B1 (de
Inventor
Rudolph W. Wacek
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.)
Shop Vac Corp
Original Assignee
Shop Vac Corp
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22612870&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0044113(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Shop Vac Corp filed Critical Shop Vac Corp
Publication of EP0044113A1 publication Critical patent/EP0044113A1/de
Application granted granted Critical
Publication of EP0044113B1 publication Critical patent/EP0044113B1/de
Expired 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
    • H01R39/38—Brush holders
    • H01R39/40—Brush holders enabling brush movement within holder during current collection

Definitions

  • the invention relates to a brush for an electric motor and more particularly to a holder for the brush.
  • the electrode or contact of the brush of an electric motor is installed in a holder.
  • the holder containing the electrode may be inserted in an appropriate positioning device in the housing of an electric motor and may be removed therefrom for replacement.
  • the electrode comprises a contact member which is preferably of a carbon type. It has a profiled and usually rectangular cross-section. It is sufficiently elongated to continuously present a contacting surface to the commutator on the armature as the elongated carbon contact member wears.
  • the elongated carbon contact member is housed in a hollow tubular holder of a cross-section which generally matches the cross-section of the electrode.
  • the housing may be provided with other cross-sectional shapes, including a partly cylindrical cross-sectional shape on two opposing sides, in order to provide within the holder itself a support for other elements, like the electrode biasing spring, as hereinafter described.
  • a contact pressure spring engages one end of the carbon contact member or electrode and is preferably secured thereto.
  • the spring is positioned in the holder and is compressed and charged between the end of the electrode within the holder and an abutment at the opposite end of the holder so that the electrode projects from an opening in the end of the holder.
  • At least two opposite side walls of the holder are bowed outwardly in matching cylindrical form to accommodate the cylindrical shape of the pressure spring.
  • the bowed out walls extend substantially the length of the holder up to the end from which the electrode emerges.
  • Known abutment means include a separate element, separate from and supported inside the holder.
  • the present invention relates to means formed in the holder for preventing the electrode biasing spring from pushing fully out of the holder.
  • the holder itself is configured upon initial fabrication to prevent the spring from moving out of the holder. Further the holder is shaped to properly guide and support the electrode against displacement and lateral and rotational motion.
  • the holder has the previously mentioned generally cylindrically rounded, or outwardly bowed opposite side walls which are shaped for receiving the cylindrical profile of the bias spring. These bowed walls extend substantially up to the open end of the holder from which the electrode projects. Near that open end of the holder, the opposite side walls are slit across their width. This defines a transition that separates the spring motion stop section of the holder near the open end from the bowed wall main section of the holder. Instead of having the bowed walls, the section of the holder at the open end defines an opening into the holder that is completely rectangular. Thus, the end section of the holder provides two opposite sides which are essentially a chord or secant across the ends of the cylindrically curved walls of the main section of the holder.
  • the rear edges of the unbowed sides provide an abutment against which the pressure spring, at the electrode end thereof, may bear so that the spring will not push itself out of the holder.
  • the spring is thus retained in the holder at one end by the rear abutment of the holder and at the opposite end by the unbowed stop section of the holder at the open end. More generally expressed, in at least one dimension across the holder, the main section is wider than the spring stop section, so that the spring moving toward the stop section will be blocked from moving through that section.
  • Interengagement or attachment of the electrode and of the spring which can-not leave the holder ensures that the electrode will not fall out of the holder while the entire-brush-structure is being transported or inserted in or removed from a motor or at the end of the useful life of the electrode.
  • the end of the holder away from the open end carries an outwardly projecting abutment which limits the insertion of the entire holder into a retainer for the brush in the motor structure and thereby positions the brush holder within the motor structure.
  • the open end of the holder is also provided with an extension which, preferably after insertion of the brush assembly into the retainer therefor in the electric motor, may be bent up to assist in retaining the holder in the retainer and to provide a connector for an electric lead for the brush.
  • the primary object of the present invention is to provide a holder for a brush electrode for an electric motor, wherein a compression spring that is compressed within the brush holder drives the contact member or electrode out through one end of the brush holder.
  • the invention further has for its object the arrangement of the holder so that a stop for the compression spring is provided adjacent the end of the holder through which the electrode projects.
  • Another object of the invention is to retain the electrode bias spring in the holder without the need for assembly of extra elements in the holder.
  • a further object of the invention is to guide motion of the electrode as the motor operates and to keep a desired orientation for the electrode.
  • a further object of the invention is to form the brush holder from a simple tubular structure which is rectangular at the open end from which the electrode emerges and which is cylindrical back from that open end to accommodate the compression spring and which inherently provides an abutment and stop for the compression spring to ensure that the compression spring always stays within the holder.
  • an electric motor 20 is here shown mounted on a support 19.
  • the illustrated motor is a bypass-type blower motor for creating suction in an electric vacuum cleaner, but the application of the invention is not limited to any particular motor.
  • the motor includes a conventional commutator 21 on the armature 22 of the motor.
  • the motor drives a shaft 23 to rotate and this in turn rotates the armature inside the stator pole pieces 24.
  • the shaft 23 drives the blower motor main fan 25 and motor cooling fan 26 in the usual manner.
  • the support 19 is provided with a lower bearing 27 and an upper bearing 28 which rotatively support the shaft 23 and support the electric motor 20.
  • the bearings 27 and 28 are in turn supported in housings 28a and 28b at the top and bottom.
  • the housings may be directly interconnected or may be connected together by the stator pole pieces 24 of the motor.
  • the housings 28a and 28b are respective plastic moldings, for instance.
  • the housing 28b carries integrally formed holder retainers 73, which are essentially tubular members, each adapted to receive the holder hereinafter described and retain it in position.
  • the contact member or electrode 30 of each brush bears against the commutator 21 of the motor armature in order to provide appropriate contact therewith for electric current as is well known in the art.
  • Each of the retainers 73 is provided with a removable cap 78 preferably of resilient insulating material in order to ensure that the brush remains within the holder retainer 73.
  • Cap 78 is a snap-on cap having a re-entrant flange 79 which in turn engages a flange 80 on the holder retainer 73 to provide appropriate means for holding the brush in place and also for retaining the brush against being accidentally snapped out. Since the c'aps 79 are of resilient material they may be removed by prying against the re-entrant member section 79 in order to permit removal of the brush which is retained by the holder retainer 73 and permit replacement thereof.
  • the brush includes a conventional carbon electrode 30 with an end 40 which engages the commutator 21.
  • the electrode 30 has a rectangular cross-section, uniform along its length.
  • the electrode is housed in the holder 31.
  • the electrode holder 31 is a tubular member initially formed from flat sheet material that has been folded over to the generally rectangular hollow cross-section seen in fig. 8.
  • the folded sheet is appropriately seamed at 32, as seen in fig. 10, in order to provide a brush holder structure which is substantially smooth inside and outside.
  • the seam is either cold welded or otherwise interengaged and secured in order to integrate and interlock the seam ends.
  • a coiled, cylindrical cross-section, compression spring 35 is positioned inside the brush holder 31 and it engages the inward or rearward end of electrode 30. The engagement is through the turn down section 36 at the end of the spring 35 being received in the opening 37 of the electrode 30. The engagement of the spring 35 with the electrode 30 ensures that the electrode 30 will not fall out of the brush holder 31 at the end of the useful life of the electrode and during transportation, insertion or removal of the entire brush structure in the holder retainer 73 of the motor.
  • the brush holder 31 is tubular, and is a rectangular tube with at least two opposite, outwardly bowed sides.
  • One pair of opposite side walls 41 and 42 are parallel to each other and are essentially planar.
  • a second pair of opposite side walls 44 and 45 are, at their upper and lower margins adjacent the walls 41 and 42, parallel to each other, but they are bowed to a generally cylindrically curved form longitudinally thereof along the central areas 46 and 47 thereof.
  • the bowed areas 46 and 47 of the walls 44 and 45 accommodate the cylindrical profile of the compression spring 35.
  • the bowed areas terminate at the slits 50 and 51 formed in the side walls 44 and 45, leaving the flat unbowed, front end stop sections 52 and 53 on the opposite side which are extensions of the walls 44 and 45. More generally stated, the distance across the holder 31 in at least one dimension, the dimension through the bowed areas 46 and 47 of the opposite walls 44 and 45, is greater than the same dimension through the unbowed corresponding side walls 41 and 42 defining the stop sections.
  • the rearwardly facing edges of the flat stop sections 52 and 53 within the holder act together as a front stop for the front end 54 of the compression spring 35. Also, they guide the axial motion and the orientation of the electrode 30 through the holder. Furthermore, together with the holder side walls 41 and 42, the stop sections are shaped to define an opening of substantially the same cross-section as the contact member 30, which prohibits lateral shifting and rotation of the contact member 30.
  • the rear end of the tube 31, at the end opposite the stop sections 52 and 53, is provided with extensions 60, 61 which are bent inwardly from the position of fig. 2 and 3 to the position shown in fig. 4 after the spring 35 has been inserted, to retain the spring compressed.
  • the compression spring 35 is preferably made of a conductive metal. Because it bears between the rear or inside end of the electrode 30 and the bent in holder extensions 61, which hold the spring in position, an electrical path is provided from the connector 65 for the electric lead through the tube to the electrode 30. In addition, because the electrode 30 preferably has a current conducting fit with the stop sections 52 and 53 of the tube, current conduction occurs from the tube to the electrode at that point.
  • the brush holder 31 When the brush holder 31 is inserted into the holder retainer 73, it is pushed in from the rear end of the retainer mechanism in a direction shown by the arrow 70 in fig. 5 and is pushed home entirely within the retainer 73 so that the contact surface 40 of the electrode 30 is pushed against the commutator 21. The spring 35 is thereby compressed. The cap 78 is snapped on over the flange 80 of the holder retainer 73 after the holder is inserted.
  • the inward movement of the brush of the present invention into the retainer 73 is controlled by the lateral extension 74 from the rear end of one of the side walls of the brush holder 31, in this case an extension from the side wall 42 - 46 at the rear.
  • the extension 74 bears against the rearward edge 75 of the holder retainer 73 and limits the inward movement of the brush holder.
  • the brush is then retained in position by the electrode 30 bearing at its contact end 40 against the commutator 21 and by the rear end of the electrode being retained in position by the cap 78.
  • the holder retainer 73 of the motor structure lacks longitudinal slots or openings. Therefore, the connector 65 on the holder for the electric lead which connects the brush into the motor circuit is initially arranged flat as shown in fig. 3. After the holder is inserted into the retainer 73, the connector 65 is bent and raised to a position where a motor lead 66 may be connected to it, as shown in fig. 6. The motor lead is, in turn, connected with the stator pole pieces 24.
  • the brush holder of the present invention is one in which a simplified brush holder tube is created, wherein a compression spring is captured between the closed rear end of the tube and the opposite front end out of which the electrode is spring biased.
  • the compression spring is thus compressed between the electrode and the rear end of the holder tube.
  • a stop is provided in the holder for the spring so that it will not be ejected from the tube.
  • the tube itself is configured at a stop section, which has a smaller cross-section than the spring, to provide the stop for the spring. Interconnection of the electrode and the spring prevents the electrode from being separated.
  • the tube itself provides a simple way of connecting the electrode in circuit with the motor and provides inherently within it appropriate electrical connection to the electrode so that a connection to a tab extending from the tube will provide full electrical connection between the electrode and the re-, mainder of the circuit.
EP19810200790 1980-07-11 1981-07-09 Bürstenhalter eines Elektromotors Expired EP0044113B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16877380A 1980-07-11 1980-07-11
US168773 1980-07-11

Publications (2)

Publication Number Publication Date
EP0044113A1 true EP0044113A1 (de) 1982-01-20
EP0044113B1 EP0044113B1 (de) 1985-01-30

Family

ID=22612870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810200790 Expired EP0044113B1 (de) 1980-07-11 1981-07-09 Bürstenhalter eines Elektromotors

Country Status (5)

Country Link
EP (1) EP0044113B1 (de)
JP (1) JPS5731073U (de)
AU (1) AU544624B2 (de)
CA (1) CA1163666A (de)
DE (1) DE3168621D1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096158A1 (de) * 1982-06-03 1983-12-21 Vorwerk & Co. Interholding GmbH Bürstenhalterung an mit Entstördrossel ausgestatteten Elektromotoren, insbesondere für Haushaltsgeräte wie Staubsauger oder dergleichen
FR2667737A1 (fr) * 1990-09-27 1992-04-10 Mitsubishi Electric Corp Porte-balais pour alternateur de vehicule.
US5227688A (en) * 1990-09-27 1993-07-13 Mitsubishi Denki K. K. Brush holder for vehicular A.C. generator
DE102008021067A1 (de) * 2008-04-26 2009-11-05 Ing. Lang & Menke Gmbh Kohleführung und Verfahren zur Herstellung einer Kohleführung
IT202000014803A1 (it) * 2020-06-19 2021-12-19 R M D Components Italia S R L Avvolgitore per ricaricare un veicolo elettrico o ibrido

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006203962A (ja) * 2005-01-18 2006-08-03 Matsushita Electric Ind Co Ltd 電動送風機

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050649A (en) * 1958-08-18 1962-08-21 Amherst Metal Products Inc Motor brush holder
GB930979A (en) * 1960-03-18 1963-07-10 Singer Mfg Co Brush holder assembly for electric machines
FR2016594A1 (de) * 1968-08-29 1970-05-08 Siemens Ag
US3955113A (en) * 1974-11-27 1976-05-04 General Signal Corporation Brush holder with means for limiting travel of brush spring
FR2363210A1 (fr) * 1976-08-28 1978-03-24 Bosch Gmbh Robert Support de balai pour machine electrique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050649A (en) * 1958-08-18 1962-08-21 Amherst Metal Products Inc Motor brush holder
GB930979A (en) * 1960-03-18 1963-07-10 Singer Mfg Co Brush holder assembly for electric machines
FR2016594A1 (de) * 1968-08-29 1970-05-08 Siemens Ag
US3955113A (en) * 1974-11-27 1976-05-04 General Signal Corporation Brush holder with means for limiting travel of brush spring
FR2363210A1 (fr) * 1976-08-28 1978-03-24 Bosch Gmbh Robert Support de balai pour machine electrique
GB1563543A (en) * 1976-08-28 1980-03-26 Bosch Gmbh Robert Brush holders for electric machines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096158A1 (de) * 1982-06-03 1983-12-21 Vorwerk & Co. Interholding GmbH Bürstenhalterung an mit Entstördrossel ausgestatteten Elektromotoren, insbesondere für Haushaltsgeräte wie Staubsauger oder dergleichen
FR2667737A1 (fr) * 1990-09-27 1992-04-10 Mitsubishi Electric Corp Porte-balais pour alternateur de vehicule.
US5227688A (en) * 1990-09-27 1993-07-13 Mitsubishi Denki K. K. Brush holder for vehicular A.C. generator
DE102008021067A1 (de) * 2008-04-26 2009-11-05 Ing. Lang & Menke Gmbh Kohleführung und Verfahren zur Herstellung einer Kohleführung
IT202000014803A1 (it) * 2020-06-19 2021-12-19 R M D Components Italia S R L Avvolgitore per ricaricare un veicolo elettrico o ibrido

Also Published As

Publication number Publication date
AU7274681A (en) 1982-01-14
EP0044113B1 (de) 1985-01-30
CA1163666A (en) 1984-03-13
AU544624B2 (en) 1985-06-06
JPS5731073U (de) 1982-02-18
DE3168621D1 (en) 1985-03-14

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