EP0391937B1 - Schleifkontaktanordnung, insbesondere für eine kohlebürste - Google Patents

Schleifkontaktanordnung, insbesondere für eine kohlebürste Download PDF

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Publication number
EP0391937B1
EP0391937B1 EP88909767A EP88909767A EP0391937B1 EP 0391937 B1 EP0391937 B1 EP 0391937B1 EP 88909767 A EP88909767 A EP 88909767A EP 88909767 A EP88909767 A EP 88909767A EP 0391937 B1 EP0391937 B1 EP 0391937B1
Authority
EP
European Patent Office
Prior art keywords
sliding contact
holder
feed direction
contact member
bristles
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
Application number
EP88909767A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0391937A1 (de
Inventor
Peter Hoffmann
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.)
Hoffmann and Co Elektrokohle AG
Original Assignee
Hoffmann and Co Elektrokohle AG
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 Hoffmann and Co Elektrokohle AG filed Critical Hoffmann and Co Elektrokohle AG
Publication of EP0391937A1 publication Critical patent/EP0391937A1/de
Application granted granted Critical
Publication of EP0391937B1 publication Critical patent/EP0391937B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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 sliding contact arrangement, in particular for a carbon brush, of the type specified in the preamble of claim 1.
  • Such a sliding contact arrangement is known from DE-C 881 831 in various versions.
  • the locking device is combined with the pressure spring and consists of expandable spring arms, balls, levers or the like, which block the lower end of the pressure spring against upward movement.
  • This locking device is intended to prevent the sliding contact body from being lifted from the slip ring or the like by shocks and vibrations, without the spring force of the pressure spring having to be dimensioned excessively large for this purpose.
  • the known locking devices are on the one hand relatively complex mechanical constructions, and on the other hand they cannot prevent the sliding contact body shifts or tilts in the holder, whereby a faultless contact of the sliding contact body on the slip ring or the like can be impaired despite the locking device.
  • the object of the invention is to develop a sliding contact arrangement of the type mentioned in such a way that improved guidance of the sliding contact body in the holder is achieved with the simplest possible design of the locking device.
  • the locking device has a double function, namely a lateral guide in the feed direction and a locking force in the opposite direction.
  • the resilient bristles also do not cause a rigid blocking of the sliding contact body, but rather allow small movements against the feed direction due to their spring stiffness, without the contact force of the contact spring being influenced in normal operation.
  • a sliding contact body guided movably in a holder is known, on one side surface of which a Current contact with a plurality of resilient, inclined contact tongues is present, so that the current transfer is distributed over a plurality of contact points on the side surface of the sliding contact body. Due to the resilient contact tongues, the sliding contact body is guided with low friction during its feed movement, but there is no blocking action against the feed direction by spreading the contact tongues.
  • the carbon brush 1 is displaceably guided in the shaft-like holder 2 and is loaded by a pressure spring 3 designed as a helical spring.
  • a pressure spring 3 designed as a helical spring.
  • the bristle strips 6 with short, stiff bristles, which are arranged in an inclined position towards the holder 2.
  • the bristle strip 6 is attached to the carbon brush 1, and the bristles 6a are obliquely upward from the bristle strip 6.
  • the bristle strip 6 is attached to the inner surface of the holder 2 as an alternative embodiment, the bristles 6 a being directed obliquely downwards in the direction of the carbon brush 1 are.
  • the bristles 6a are dimensioned with respect to their length and rigidity so that they allow the carbon brush 1 to move downward under the force of the pressure spring 3, but they spread out between the carbon brush 1 and the holder 2 with each movement of the carbon brush 1 and that Block upward movement. Due to the bending stiffness of the bristles 6a, a certain small spring travel of the carbon brush 1 in the holder 2 may still be possible, in which case the additional spring force exerted by the bristles 6a is substantially greater than that of the pressure spring 3 and, for example, progressively increasing.
  • the bristle strips 6 with the bristles 6a can be made of any suitable material, in particular a sufficiently rigid plastic or steel.
  • the embodiment according to FIG. 2 largely corresponds to that according to FIG. 1, but the holder 2 is displaceably arranged in a stationary guide 8 and can move slightly upwards against the force of an additional spring 7, for example a plate spring.
  • an additional spring 7 for example a plate spring.
  • bristle strips 6 and bristles 6a are fastened as a latching and feeding device, which are inclined downwards in the direction of the carbon brush 1.
  • the bristles 6a can be dimensioned such that they have essentially no spring travel for the carbon brush 1 upwards allow, since a corresponding spring travel of the holder 2 is possible due to the additional plate spring 7.
  • Both embodiments have in common that the carbon brush 1 is latched or spread on the holder 2 in the event of an upward movement in such a way that upward movements are only achieved by overcoming an additional spring force provided by the bristles 6a in FIG. 1 or the plate spring 7 in FIG. 2 will be possible.
  • Appropriate dimensioning of the size and the progressive characteristic of this additional spring force which can be selected completely independently of that of the actual pressure spring 3, effectively prevents movements of the carbon brush 1 against the pressure direction.
  • the bristle strips also improve the guidance of the sliding contact body in the holder, or the spring play reduces the holder play.
  • the latching or spreading device can also take over the task of contacting and supplying current to the carbon brush 1 if metallic or in any case conductive material is used for the bristle strips 6 and bristles 6a.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
EP88909767A 1987-10-28 1988-10-27 Schleifkontaktanordnung, insbesondere für eine kohlebürste Expired - Lifetime EP0391937B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3736535 1987-10-27
DE19873736535 DE3736535A1 (de) 1987-10-28 1987-10-28 Schleifkontaktanordnung, insbesondere fuer eine kohlebuerste

Publications (2)

Publication Number Publication Date
EP0391937A1 EP0391937A1 (de) 1990-10-17
EP0391937B1 true EP0391937B1 (de) 1993-12-29

Family

ID=6339281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88909767A Expired - Lifetime EP0391937B1 (de) 1987-10-28 1988-10-27 Schleifkontaktanordnung, insbesondere für eine kohlebürste

Country Status (5)

Country Link
US (1) US5114351A (enrdf_load_stackoverflow)
EP (1) EP0391937B1 (enrdf_load_stackoverflow)
JP (1) JPH03501906A (enrdf_load_stackoverflow)
DE (1) DE3736535A1 (enrdf_load_stackoverflow)
WO (1) WO1989004073A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5767605A (en) * 1996-07-31 1998-06-16 The B.F. Goodrich Company Brush assembly with wear inserts for a rotating ice protection system
US6380656B1 (en) * 2000-06-28 2002-04-30 Visteon Global Technologies, Inc. Liquid cooled alternator brush holder ribs
US6800981B2 (en) * 2001-04-30 2004-10-05 Hipercon, Llc Tubular brush holder
DE10332302A1 (de) * 2003-07-16 2005-02-17 Robert Bosch Gmbh Bürstenanordnung für eine elektrische Maschine
US7545072B2 (en) * 2005-10-13 2009-06-09 Culsforth Products, Inc. Resilient member for a brush holder assembly
US8247944B2 (en) * 2009-08-28 2012-08-21 Steering Solutions Ip Holding Corporation Method for reducing current and torque ripple in a brushed electric motor and motor employing the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE881831C (de) * 1942-09-01 1953-07-02 Siemens Ag Schleifbuerstenhalterung fuer Kommutatoren oder elektrische Schleifringanordnungen
US3028515A (en) * 1958-10-27 1962-04-03 Gen Motors Corp Brush holder
US3171050A (en) * 1962-10-24 1965-02-23 Gordon James Electrical brush holder
US4266155A (en) * 1979-09-10 1981-05-05 The Singer Company Brush holder assembly
DE3204865A1 (de) * 1982-02-11 1983-08-18 Siemens AG, 1000 Berlin und 8000 München Elektrische anschlusseinrichtung fuer eine kohlebuerste aufnehmende elektrisch leitfaehige buerstenhuelse

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
US8087976B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Trigger assembly for angle grinder
US8087977B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

Also Published As

Publication number Publication date
DE3736535A1 (de) 1989-05-18
DE3736535C2 (enrdf_load_stackoverflow) 1991-02-28
US5114351A (en) 1992-05-19
JPH03501906A (ja) 1991-04-25
EP0391937A1 (de) 1990-10-17
WO1989004073A1 (fr) 1989-05-05

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