EP0023537A1 - Balai de charbon avec dispositif de coupure - Google Patents

Balai de charbon avec dispositif de coupure Download PDF

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Publication number
EP0023537A1
EP0023537A1 EP80102639A EP80102639A EP0023537A1 EP 0023537 A1 EP0023537 A1 EP 0023537A1 EP 80102639 A EP80102639 A EP 80102639A EP 80102639 A EP80102639 A EP 80102639A EP 0023537 A1 EP0023537 A1 EP 0023537A1
Authority
EP
European Patent Office
Prior art keywords
carbon brush
metal cap
connecting piece
lifting spring
spring
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Withdrawn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
EP80102639A
Other languages
German (de)
English (en)
Inventor
Franz Wenzel
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.)
Rekofa Wenzel & Co Kg GmbH
Original Assignee
Rekofa Wenzel & Co Kg GmbH
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 Rekofa Wenzel & Co Kg GmbH filed Critical Rekofa Wenzel & Co Kg GmbH
Publication of EP0023537A1 publication Critical patent/EP0023537A1/fr
Withdrawn legal-status Critical Current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
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/58—Means structurally associated with the current collector for indicating condition thereof, e.g. for indicating brush wear
    • 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 carbon brush with a switch-off device, which has a lifting spring with insulating nipples provided at one end facing its running surface, which is located in a bore parallel to the brush axis in the head of the carbon brush.
  • Such switch-off device n are mainly used in comparatively small electrical machines in which the carbon brushes are not observed or serviced, so that the dimensions of the carbon brushes are also comparatively small. It is known to attach switch-off devices to the heads of carbon brushes by soldering or gluing. This type of fastening has the disadvantage that the switch-off devices can be released if the brushes cannot be heated, so that. a safe shutdown is no longer guaranteed. There is also the risk that solder or adhesive will get to the lifting springs and thus jeopardize their perfect function.
  • the invention has for its object to avoid the aforementioned disadvantages to create a carbon brush with shutdown device of the type mentioned, the spring is safe and easy to attach even with very small carbon brushes and those made of very soft material and which additionally the Anbrin in a simple way supply cable.
  • the lifting spring is at its other end against the bottom of a metal cap, e.g. made of copper or brass, which is equipped with a step-shaped extension, which includes a shoulder on the head of the carbon brush.
  • the metal cap and the neck can have a cylindrical shape.
  • a connector is advantageously arranged in the stepped bottom region of the metal cap outside of the step-shaped extension, which is connected to a stranded wire which passes through an opening in the bottom of the metal cap.
  • the connector can be formed by a press ring made of copper powder. The connector is pressed into the stepped bottom area of the metal cap, so that a perfect fixing is achieved. The offset bottom area of the metal cap is extended by the thickness of the connector compared to the version without a strand. In this way it is possible even without any difficulties in connecting a power lead to the metal cap.
  • a cap made of insulating material is advantageously attached between the metal cap and the lift-off spring, which prevents current from flowing over the lift-off spring laterally over the walls of the bore to the carbon brush.
  • the metal cap is at its free edge with three or more inward claws or the like. provided, which press into the head of the carbon brush and increase the adhesive effect.
  • the lifting spring 4 of the switch-off device In the head of the carbon brush 1 there is a bore parallel to the brush axis, in which the lifting spring 4 of the switch-off device is located, which is designed as a compression spring and has an insulating nipple 5 at one end facing its running surface.
  • the other end of the lifting spring 4 is supported on the bottom of the metal cap 6, which is equipped with a step-like extension, so that its bottom area is offset.
  • the step-like extension encompasses a turned-off shoulder on the head of the carbon brush 1, the outer diameter of the shoulder on the head of the carbon brush 1 and the inner diameter of the extension of the metal cap being matched to one another in such a way that a tight fit between the shoulder and extension of the metal cap is ensured.
  • a cap 7 made of insulating material is attached, which prevents current from flowing over the lifting spring 4 laterally over the bore wall to the carbon brush.
  • the embodiment shown in FIG. 1 is a carbon brush 1 without a power lead, in which the current is supplied via the brush spring 8.
  • the brush spring 8 which is designed as a helical spring, is pushed with its one end outside over the stepped bottom region of the metal cap 6 and is supported on the outside on the step-shaped extension. Since both parts are made of highly conductive metal, the contact resistance between the brush spring 8 and the metal cap is low. The current flows from the metal cap over the head of the carbon brush to the brush running surface. Since the contact area between carbon brush 1 and metal cap 6 is comparatively large, there is also a low contact resistance here.
  • part of the lifting spring 4 protrudes beyond the head of the carbon brush 1, so that there is a relatively short installation length, with the result that only a very small part of the length of wear of the carbon brush is lost for the switch-off device.
  • Fig. 2 the carbon brush 1 is shown in the worn state, in which the lifting spring 4 has pushed the rest of the carbon brush 1 away from the collector, so that the insulating nipple 5 touches the running surface of the collector 3 and interrupts the power supply.
  • the lifting pressure can be adjusted via the depth of the hole in the head of the carbon brush 1.
  • FIGS. 3-5 show an embodiment of a carbon brush with a switch-off device, in which a connecting wire is provided.
  • the metal cap 6 is provided with a concentric bore in the bottom area.
  • the connecting lead 9 is guided through this bore.
  • the connecting wire 9 is inserted at its lower end into a connector 10 which is formed by a compact made of copper powder.
  • This connector 10 has a cylindrical shape and is firmly pressed into the bottom region of the metal cap 6. Since a connector 10 can be produced as a compact with very high strength, it is possible to press this connector very tightly into the metal cap 6, so that there is good electrical contact between the metal cap 6 and the strand 9.
  • the lifting spring 4 is located below the connector 10, the stepped bottom region of the metal cap 6 is extended by the thickness of the connector 10 compared to the version without a strand 9 according to FIGS. 1 and 2.
  • a cap 7 made of insulating material can be attached between the connecting piece 10 and the lifting spring 4.
  • Figure 4 shows the lead 9 with the connector 10 in the form of a pressed compact made of copper powder.
  • the metal cap 6 can be provided on its free edge with three or more, inwardly directed claws which press into the head of the carbon brush 1 and in this way increase the adhesion between the metal cap 6 and the carbon brush 1 .

Landscapes

  • Motor Or Generator Current Collectors (AREA)
EP80102639A 1979-07-21 1980-05-13 Balai de charbon avec dispositif de coupure Withdrawn EP0023537A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE7920943U 1979-07-21
DE7920943U DE7920943U1 (de) 1979-07-21 1979-07-21 Kohlebürste mit Abschaltvorrichtung

Publications (1)

Publication Number Publication Date
EP0023537A1 true EP0023537A1 (fr) 1981-02-11

Family

ID=6705973

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80102639A Withdrawn EP0023537A1 (fr) 1979-07-21 1980-05-13 Balai de charbon avec dispositif de coupure

Country Status (2)

Country Link
EP (1) EP0023537A1 (fr)
DE (1) DE7920943U1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536670A (en) * 1981-12-14 1985-08-20 Morganite Incorporated Electrical brushes with wear sensors
JPH0464973U (fr) * 1990-10-12 1992-06-04
US5488261A (en) * 1993-05-11 1996-01-30 Schunk Kohlenstofftechnik Gmbh Carbon brush and fastening a braided indicator wire therein
EP0856384A1 (fr) * 1997-01-31 1998-08-05 Robert Bosch Gmbh Outil à main entraíné par moteur avec un détecteur, qui donne un signal de service quand les balais arrivent à une longueur minimale
GB2335801A (en) * 1998-03-24 1999-09-29 Bosch Gmbh Robert Commutation brush having a cutoff member supported on a flat cap
CN103181037A (zh) * 2010-10-22 2013-06-26 罗伯特·博世有限公司 具有断路装置的碳刷
EP3217488A1 (fr) * 2016-03-10 2017-09-13 HILTI Aktiengesellschaft Systeme de balais de charbon

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4304527A1 (de) * 1993-02-15 1994-08-18 Miele & Cie Abschaltkohlebürste für Kollektormotoren, insbesondere für einen Staubsauger-Gebläsemotor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE621596C (de) * 1935-11-09 Siemens Schuckertwerke Akt Ges Einrichtung zur Verhinderung des UEberschreitens der zulaessigen Buerstenabnutzung an Kollektoren
DE7010521U (de) * 1970-03-21 1971-08-26 Bosch Gmbh Robert Abschaltkohlebuerste.
DE2801839A1 (de) * 1978-01-17 1979-07-19 Bosch Gmbh Robert Abschaltkohlebuerste

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE621596C (de) * 1935-11-09 Siemens Schuckertwerke Akt Ges Einrichtung zur Verhinderung des UEberschreitens der zulaessigen Buerstenabnutzung an Kollektoren
DE7010521U (de) * 1970-03-21 1971-08-26 Bosch Gmbh Robert Abschaltkohlebuerste.
US3681635A (en) * 1970-03-21 1972-08-01 Bosch Gmbh Robert Carbon brush for use in electric motors
DE2801839A1 (de) * 1978-01-17 1979-07-19 Bosch Gmbh Robert Abschaltkohlebuerste

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4536670A (en) * 1981-12-14 1985-08-20 Morganite Incorporated Electrical brushes with wear sensors
JPH0464973U (fr) * 1990-10-12 1992-06-04
US5488261A (en) * 1993-05-11 1996-01-30 Schunk Kohlenstofftechnik Gmbh Carbon brush and fastening a braided indicator wire therein
EP0856384A1 (fr) * 1997-01-31 1998-08-05 Robert Bosch Gmbh Outil à main entraíné par moteur avec un détecteur, qui donne un signal de service quand les balais arrivent à une longueur minimale
GB2335801A (en) * 1998-03-24 1999-09-29 Bosch Gmbh Robert Commutation brush having a cutoff member supported on a flat cap
FR2776847A1 (fr) * 1998-03-24 1999-10-01 Bosch Gmbh Robert Balai de collecteur pour des moteurs electriques a collecteur
GB2335801B (en) * 1998-03-24 2000-06-07 Bosch Gmbh Robert Commutation brush for electrical commutator machines
AT412046B (de) * 1998-03-24 2004-08-26 Bosch Gmbh Robert Kommutierungsbürste für elektrische kommutatormaschinen
CN103181037A (zh) * 2010-10-22 2013-06-26 罗伯特·博世有限公司 具有断路装置的碳刷
US20130270963A1 (en) * 2010-10-22 2013-10-17 Robert Bosch Gmbh Carbon brush with disconnection apparatus
US9373990B2 (en) * 2010-10-22 2016-06-21 Robert Bosch Gmbh Carbon brush with disconnection apparatus
EP3217488A1 (fr) * 2016-03-10 2017-09-13 HILTI Aktiengesellschaft Systeme de balais de charbon
WO2017153391A1 (fr) * 2016-03-10 2017-09-14 Hilti Aktiengesellschaft Ensemble balai de charbon

Also Published As

Publication number Publication date
DE7920943U1 (de) 1979-11-22

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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 FR GB IT 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: 19820119

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WENZEL, FRANZ