EP0937320B1 - Balai de mise hors circuit pour machine-outil electrique tenue a la main - Google Patents

Balai de mise hors circuit pour machine-outil electrique tenue a la main Download PDF

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Publication number
EP0937320B1
EP0937320B1 EP98945040A EP98945040A EP0937320B1 EP 0937320 B1 EP0937320 B1 EP 0937320B1 EP 98945040 A EP98945040 A EP 98945040A EP 98945040 A EP98945040 A EP 98945040A EP 0937320 B1 EP0937320 B1 EP 0937320B1
Authority
EP
European Patent Office
Prior art keywords
carbon brush
commutator
machine tool
area
electrical
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
EP98945040A
Other languages
German (de)
English (en)
Other versions
EP0937320A1 (fr
Inventor
Günther Berger
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0937320A1 publication Critical patent/EP0937320A1/fr
Application granted granted Critical
Publication of EP0937320B1 publication Critical patent/EP0937320B1/fr
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
    • H01R39/58—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
    • H01R39/381—Brush holders characterised by the application of pressure to brush

Definitions

  • the invention is based on an electric hand machine tool according to the preamble of claim 1.
  • DE-OS 43 21 475 is a carbon brush for DC electric motors known in the area of her headboard has two axial, step-shaped extensions, which as a frame serve for one current-carrying wire each. Between Extension is a hard tissue contact surface for one Pressure element and a damping pad underneath provided, the pressure element on the carbon brush Commutator should press.
  • the extensions are only about axially by 5% of the total length of the cabbage brush over the contact surface for the printing element.
  • This has the well-known carbon brush the disadvantage that they are not even close to extends to the height of the pressure element or the pressure spring, i.e. to their axially outermost Area. This determines the lifespan of the carbon brush Area of the carbon brush and its service life relatively short.
  • the by the position and the dimensions the pressure spring determined the outer diameter of the corresponding Carbon brushes equipped electric motor and corresponding housing area of those equipped with such a motor Electric hand machine tool is proportional large and in no way corresponds to an optimal grip size of the tool especially when the motor housing as Handle serves.
  • An optimal or the smallest possible grip circumference The electric hand machine tool is because of the limits the scalability of the collector diameter and the length of the carbon brush only relatively difficult to achieve.
  • the length of the carbon brush is determined by the difference between the collector radius and the outer radius of the housing minus the spring protrusion (overall height) compared to the housing.
  • the known carbon brush is therefore for power tools, their Handle formed by the motor housing is too short.
  • the known carbon brush has no security of the electric hand tool improving and the usable carbon brush lengths further reducing shutdown device so that if the shutdown device is installed in the known carbon brush would, whose term would be even shorter than without a shutdown device.
  • a hand tool according to the invention with the characteristic Features of claim 1 can be carried out so that they have the advantage has that with built-in shut-off device by 2 to 3 mm is longer, so that the running time of the electric hand tool until the next cabbage brush change by about 20 to 30 Hours extended.
  • the spring means can be designed as a spiral spring, is a minimal space in the motor housing for the maximum length of the carbon brush fully usable.
  • the electric hand machine tool shown in Figure 1 is an angle grinder 10, from the motor housing 12 at the rear an electrical connection cable 11 emerges, the outer contour 13 of the motor housing 12 on opposite sides a dashed line is highlighted, which is proportional small outer diameter of the motor housing 12 clarifies
  • a gear housing 14 is flanged to the front of the motor housing 12, the one at right angles to the motor housing axis has downward emerging output shaft 14 '. Laterally the motor housing 12 carries a button 15 for switching on and off an electrical switch controlling the motor.
  • a motor 16 with a Recognizable rotor 18 Inside the motor housing 12 is a motor 16 with a Recognizable rotor 18, the rear bearing 19 is in the middle is supported in the rear area of the motor housing 12.
  • the rotor 18 carries axially adjacent to the rear bearing 19 a commutator 20, on which there are radially elongated carbon brushes 22 elastically support with a rectangular cross-section, which are held in rectangular-tubular carbon brush guides 24 are arranged on a support 17 fixed to the housing are.
  • the carbon brush guides 24 have a side slot 25 ( Figure 3) on the side by a coil spring 26 with grab her arm 30 and the wear-related shift the carbon brush 22 can follow the commutator 20.
  • the coil spring 26 is in the middle of its spiral area with a clamping end 31 in a slot 29 of a spring holder 28 secured against loss and the the clamping end 31 opposite support arm 30 of the coil spring 26 is supported at the top on a support surface 32 of a head region 34 of the carbon brush 22 from ( Figure 3).
  • the carbon brush 22 carries an extension 36 on the head region 34, which is radial over the radially outermost edge of the carbon brush guides 24 protrudes.
  • the foot region 35 of the carbon brushes 22 serves as Contact and wear part and is supported radially on the commutator 20 from.
  • Figure 2 shows a plan view of the hand machine tool 10 according to FIG. 1 and in particular makes the position of the carbon brush guide 24 and the coil spring 26 and the spring holder 28 and an electrical connection strand 40 clearly, the flexible to follow the movement of the carbon brush 22.
  • Figure 3 shows only part of the upper half of the mirror-inverted downward cross-section of a Hand tool 10 ', in contrast to the figures 1 and 2 in detail an embodiment of a Commutator range is shown, the coil springs 26 opposite the longitudinal axis of the commutator 20 rotated by 90 degrees are arranged. Accordingly, the spring holder 28 with the slots 29 also 90 degrees compared to the embodiment 1 and 2 arranged rotated. Moreover the carbon brush 22 has an inclined foot 35 and is opposite the radial, starting from the center of the commutator 20 laterally offset. It becomes clear when the head area is viewed 34 an angled recess in which also a groove 33 extends into which the support arm 30 of the coil spring 26 is immersed and thus to prevent the carbon brush from slipping sideways 22 is secured.
  • Figure 4 shows the detail of a carbon brush 22 with a in the extension 36 in the form of a shutoff member 38 the angled recess becomes clear through the curved Course of the support surface 32 or parallel to it extending end face 36a of the head region 34 of the carbon brush 22 is determined, it being clear from FIG. 3, that in between the extensions of the top face 36a and the side surfaces 42, 44 formed upper outer contour or in the angled recess, the spring means 26 at least with the one supported on the carbon brush 22 Area in the mounting position of the carbon brush 22 is flush plunge.
  • FIG. 5 shows the view of the narrow side of the carbon brush 22 and illustrates the arrangement of the groove 33 and the location of the support arm 30 of the coil spring 26 securing side walls 46, 48 of the carbon brush 22.
  • the function of the shutdown element 38 is that at increasing wear the lower edge of the shut-off device 38 stamp-free and resilient by a compression spring 50 can support on the collector 20. This is the case when reached the upper limit of wear, the carbon brush 22 against the force of the coil spring 26 to the outside pressed so that a contact between the current-carrying Strand 40 and the commutator 20 prevented. It switches the electric motor automatically turns off, causing damage of the commutator by contact with the strand 40, sliding friction from metal to metal, is prevented at high speeds.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
  • Manipulator (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)
  • Inorganic Insulating Materials (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Brushes (AREA)

Claims (6)

  1. Machine-outil électrique portable (10) comprenant un moteur électrique (16) dont le commutateur (20) peut être relié à une source de tension à l'aide d'au moins un balai de charbon (22) appliqué contre le commutateur (20) par des moyens élastiques (26), le balai de charbon (22) comportant une partie de tête (34) et une partie de pied (35) et portant un cordon électrique (40) ainsi qu'un organe de coupure (38), qui lors d'une usure déterminée de la partie de pied (35) du balai de charbon (22) est poussé vers l'extérieur par la partie de pied sollicitée par un ressort de compression (50), ce qui décolle le balai de charbon du commutateur contre la force des moyens élastiques (26) et coupe ainsi automatiquement la connexion électrique entre la source de tension et le commutateur (20),
    caractérisée en ce que
    le balai de charbon (22), dans la zone de sa partie de tête (34), est prolongé par un appendice axial (36) servant de douille pour l'organe de coupure (38) et qui est dimensionné de telle sorte que dans la position de montage du balai de charbon, les moyens élastiques (26), du moins par la zone en appui contre le balai de charbon (22), plongent, notamment à fleur, dans le contour de balai supérieur formé entre sa face frontale supérieure (36a) et des prolongements des faces latérales (42, 44) du balai de charbon.
  2. Machine-outil électrique portable selon la revendication 1,
    caractérisée en ce qu'
    un ressort spiral sert de moyen élastique (26), qui par une extrémité, notamment bombée, de la zone spiralée, de préférence zone de bras d'appui (30), s'étend à l'intérieur du contour extérieur du balai de charbon (22) et prend appui contre une surface d'appui (32) au niveau de la partie de tête (34) du balai de charbon (22).
  3. Machine-outil électrique portable selon la revendication 2,
    caractérisée en ce que
    le bras d'appui (30) prend appui de manière immobilisée en position dans une rainure (33) au niveau de la partie de tête (34) du balai de charbon (22).
  4. Machine-outil électrique portable selon la revendication 1, 2 ou 3,
    caractérisée en ce que
    le balai de charbon (22) présente une forme allongée d'une section rectangulaire avec un grand côté (42) et un petit côté (44).
  5. Machine-outil électrique portable selon la revendication 3,
    caractérisée en ce qu'
    un côté plat du ressort spiral (26) est disposé pour l'essentiel en parallèle et à proximité immédiate du petit côté (44) du balai de charbon (22).
  6. Machine-outil électrique portable selon la revendication 3,
    caractérisée en ce que
    le cordon électrique (40) sort sensiblement à l'angle droit, de préférence d'une ouverture de sortie (42), du grand côté (42) du balai de charbon (22).
EP98945040A 1997-09-10 1998-07-23 Balai de mise hors circuit pour machine-outil electrique tenue a la main Expired - Lifetime EP0937320B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE29716245U 1997-09-10
DE29716245U DE29716245U1 (de) 1997-09-10 1997-09-10 Elektrohandwerkzeugmaschine
PCT/DE1998/002077 WO1999013538A1 (fr) 1997-09-10 1998-07-23 Balai de mise hors circuit pour machine-outil electrique tenue a la main

Publications (2)

Publication Number Publication Date
EP0937320A1 EP0937320A1 (fr) 1999-08-25
EP0937320B1 true EP0937320B1 (fr) 2004-10-13

Family

ID=8045794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98945040A Expired - Lifetime EP0937320B1 (fr) 1997-09-10 1998-07-23 Balai de mise hors circuit pour machine-outil electrique tenue a la main

Country Status (6)

Country Link
US (1) US6087754A (fr)
EP (1) EP0937320B1 (fr)
AT (1) ATE279797T1 (fr)
BR (1) BR9806239A (fr)
DE (2) DE29716245U1 (fr)
WO (1) WO1999013538A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010042807A1 (de) 2010-10-22 2012-04-26 Robert Bosch Gmbh Kohlebürste mit Abschaltvorrichtung
DE102010042804A1 (de) 2010-10-22 2012-04-26 Robert Bosch Gmbh Kohlebürste mit Abschaltvorrichtung

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20000223U1 (de) * 2000-01-10 2001-05-23 Bosch Gmbh Robert Winkelschleifer mit Elektroantrieb
JP3898942B2 (ja) * 2001-11-30 2007-03-28 並木精密宝石株式会社 ブラシ装置及びブラシ付きモータ
JP4195861B2 (ja) 2001-12-18 2008-12-17 カッツフォース プロダクツ インコーポレイテッド 機械を停止せずに取り外され得るブラシホルダ
US6664701B1 (en) * 2002-06-13 2003-12-16 Black & Decker Inc. Brush assembly
US6713916B1 (en) * 2002-10-31 2004-03-30 Black & Decker Inc. Electric motor assembly
US6798109B2 (en) * 2002-10-31 2004-09-28 Black & Decker Inc. Electric motor brush assembly
US6858957B2 (en) * 2002-10-31 2005-02-22 Black & Decker Inc. Electric motor end plate with visual alignment indicia
CN100442611C (zh) * 2004-06-03 2008-12-10 申克碳化技术股份有限公司 碳刷保持装置
US8087977B2 (en) * 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder
US20090189479A1 (en) * 2008-01-25 2009-07-30 Energy Conversion Systems Holdings, Llc Brush Assembly
DE102008041716A1 (de) * 2008-08-29 2010-03-04 Robert Bosch Gmbh Handwerkzeugmaschine mit Bürstenmotor
DE102008041717A1 (de) * 2008-08-29 2010-03-04 Robert Bosch Gmbh Handwerkzeugmaschine mit Bürstenmotor
CN102113861A (zh) * 2011-02-14 2011-07-06 俞育铭 吸尘器电机的电器控制装置
US8922092B2 (en) 2011-03-07 2014-12-30 Cutsforth, Inc. Brush holder assembly with quick disconnect terminal
DE102017201311A1 (de) * 2017-01-27 2018-08-02 Robert Bosch Gmbh Handwerkzeugmaschine
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch
AU2021391431B2 (en) 2020-12-01 2024-05-16 Cutsforth, Inc. Brush assembly

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2016173A (en) * 1932-04-29 1935-10-01 Eclipse Aviat Corp Brush mechanism for dynamo-electric machines
US2454562A (en) * 1946-10-17 1948-11-23 Gen Electric Current collector brush mechanism
US2813208A (en) * 1954-04-20 1957-11-12 George D Ritter Electrical contact brush
DE7010521U (de) * 1970-03-21 1971-08-26 Bosch Gmbh Robert Abschaltkohlebuerste.
FR2094469A5 (fr) * 1970-06-23 1972-02-04 Lorraine Carbone
US3908142A (en) * 1970-10-09 1975-09-23 Cons Foods Corp Electric motor brush assembly
DE7838610U1 (de) * 1978-12-28 1979-03-29 Robert Bosch Gmbh, 7000 Stuttgart Elektrische Kleinmaschine mit wenigstens einer durch die Kraft einer Spiralfeder an einem Kollektor angelegten Kohlenbürste
DE3047421A1 (de) * 1980-12-17 1982-07-15 Ringsdorff-Werke GmbH, 5300 Bonn Abschaltbuerste
DE8709324U1 (fr) * 1987-07-07 1987-08-13 Ringsdorff-Werke Gmbh, 5300 Bonn, De
DE4321475A1 (de) * 1993-06-28 1995-01-05 Siemens Ag Kommutierungsbürste
US5648706A (en) * 1995-09-28 1997-07-15 S-B Power Tool Company Electric brake for commutated motor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010042807A1 (de) 2010-10-22 2012-04-26 Robert Bosch Gmbh Kohlebürste mit Abschaltvorrichtung
DE102010042804A1 (de) 2010-10-22 2012-04-26 Robert Bosch Gmbh Kohlebürste mit Abschaltvorrichtung
WO2012052318A1 (fr) 2010-10-22 2012-04-26 Robert Bosch Gmbh Balai de charbon comportant un dispositif de coupure
WO2012052319A1 (fr) 2010-10-22 2012-04-26 Robert Bosch Gmbh Balai de charbon comportant un dispositif de coupure
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
US9373990B2 (en) 2010-10-22 2016-06-21 Robert Bosch Gmbh Carbon brush with disconnection apparatus

Also Published As

Publication number Publication date
ATE279797T1 (de) 2004-10-15
DE59812118D1 (de) 2004-11-18
DE29716245U1 (de) 1999-01-21
US6087754A (en) 2000-07-11
BR9806239A (pt) 2000-03-28
EP0937320A1 (fr) 1999-08-25
WO1999013538A1 (fr) 1999-03-18

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