EP0937320A1 - 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

Info

Publication number
EP0937320A1
EP0937320A1 EP98945040A EP98945040A EP0937320A1 EP 0937320 A1 EP0937320 A1 EP 0937320A1 EP 98945040 A EP98945040 A EP 98945040A EP 98945040 A EP98945040 A EP 98945040A EP 0937320 A1 EP0937320 A1 EP 0937320A1
Authority
EP
European Patent Office
Prior art keywords
carbon brush
electric hand
commutator
machine tool
electric
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
EP98945040A
Other languages
German (de)
English (en)
Other versions
EP0937320B1 (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

Links

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 relates to an electric hand machine tool according to the preamble of claim 1.
  • a carbon brush for DC electric motors which has two axial, step-shaped extensions in the area of its head part, which serve as a socket for one current-carrying wire. Between the extensions there is a contact surface made of hard tissue for a pressure element and a damping pad underneath, the pressure element being intended to press the carbon brush against the commutator.
  • the projections protrude axially only about 5% of the total length of the cabbage brush over the contact surface for the pressure element.
  • the known carbon brush has the disadvantage that it does not even extend nearly to the height of the pressure element or the pressure spring, that is, to its axially outermost region.
  • the area of the carbon brush that determines the service life of the carbon brush or its service life is relatively short.
  • the outer diameter of the electric motor equipped with the corresponding carbon brushes, which is determined by the position and the dimensions of the pressure spring, and the corresponding housing area which is equipped with such a motor. piece electric hand machine tool is relatively large and in no way corresponds to an optimal grip circumference of the tool, especially when the motor housing serves as a handle. An optimal or as small as possible grip circumference of the electric hand machine tool is relatively difficult to achieve due to the limits of the size of the collector diameter and the length of the carbon brush.
  • 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 (height) compared to the housing.
  • the known carbon brush is therefore too short for power tools, the handle of which is formed by the motor housing.
  • the known carbon brush does not have a shut-off element which improves the safety of the electric hand tool and further reduces the usable carbon brush lengths, so that if the shut-off element were installed in the known carbon brush, its running time would be even shorter than without a shut-off element.
  • the hand tool according to the invention with the characterizing features of claim 1 has the advantage that it is 2 to 3 mm longer when the shut-off device is installed, so that the running time of the electric hand tool is extended by about 20 to 30 hours until the next carbon brush change.
  • the spring means are designed as a spiral spring, a minimal installation space in the motor housing for the maximum length of the carbon brush can be fully utilized. Characterized in that the spiral leaf spring is secured with its support arm area in a groove of the carbon brush position, it is ensured that the carbon brush is pressed securely in the direction of the commutator until the shutdown element responds, and thereby sparking and burn damage to the commutator can be excluded.
  • FIG. 1 shows a hand-held power tool designed as an angle grinder with the carbon brushes according to the invention in partial longitudinal section
  • FIG. 2 shows the angle grinder according to FIG. 1 in a view from above with the motor housing partially broken open
  • FIG. 3 shows the cross section of a further exemplary embodiment of an electric hand machine tool in the region of the carbon brush holder
  • Figure 4 shows the detail of a carbon brush according to the invention, cut along the broad side and Figure 5 shows the detail of the carbon brush according to Figure 4 with the view of the narrow side.
  • the electric hand machine tool shown in Figure 1 is an angle grinder 10, from whose motor housing 12 an electrical connection cable 11 emerges at the rear, the outer contour 13 of the motor housing 12 being highlighted on opposite sides by a dashed line each, which illustrates the relatively small outer diameter of the motor housing 12
  • a gear housing 14 is flanged to the front of the motor housing 12 and has an output shaft 14 'which emerges at a right angle to the motor housing axis.
  • the motor housing 12 On the side, the motor housing 12 carries a button 15 for switching an electric switch controlling the motor on and off.
  • a motor 16 with a rotor 18 can be seen, the rear bearing 19 of which is supported centrally in the rear region of the motor housing 12.
  • the rotor 18 carries a commutator 20, on which radially elongated carbon brushes 22 with a rectangular cross-section are elastically supported, which are held in rectangular-tubular carbon brush guides 24 which are arranged on a carrier 17 in a manner fixed to the housing.
  • the carbon brush guides 24 have a side slot 25 (FIG. 3), through which a spiral spring 26 engages with their arm 30 and can follow the wear-related displacement of the carbon brush 22 towards the commutator 20.
  • the spiral spring 26 is held in the middle of its spiral area with a clamping end 31 in a slot 29 of a spring holder 28 so as to prevent it from losing, and the support arm 30 of the spiral spring 26 opposite the clamping end 31 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 projects radially beyond the radially outermost edge of the carbon brush guides 24.
  • the foot region 35 of the carbon brushes 22 serves as a contact and wear part and is supported radially on the commutator 20.
  • FIG. 2 shows a plan view of the handheld power tool 10 according to FIG. 1 and in particular shows the position of the carbon brush guide 24 and the spiral spring 26 as well as the spring holder 28 and an electrical connecting wire 40, which can flexibly follow the movement of the carbon brush 22.
  • FIG. 3 shows only a part of the upper half of the cross-section of a hand-held power tool 10 ', which continues downwards in mirror image, whereby, in contrast to FIGS. 1 and 2, an exemplary embodiment of a commutator area is shown, the spiral springs 26 of which are 90 degrees with respect to the longitudinal axis of the commutator 20 are rotated. Accordingly, the spring holder 28 with the slots 29 are also rotated by 90 degrees with respect to the exemplary embodiment in FIGS. 1 and 2.
  • the carbon brush 22 has an inclined foot 35 and is laterally offset from the radial starting from the center of the commutator 20.
  • Extension 36 protrudes beyond the upper edge of the carbon brush guide 24.
  • the side slot 25 of the carbon brush guide 22 is also clearly visible.
  • FIG. 4 shows the detail of a carbon brush 22 with a shut-off element 38 mounted in a socket-like manner in the extension 36, the angular recess being clear, which is determined by the curved course of the support surface 32 or the end face 36a of the head region 34 of the carbon brush 22 running parallel thereto , it is clear from Figure 3 that in the upper outer contour formed between the extensions of the upper end face 36a and the side surfaces 42, 44 or in the angular recess, the spring means 26 at least with the area supported on the carbon brush 22 in the mounting position of the Immerse the carbon brush 22 flush.
  • FIG. 5 shows the view of the narrow side of the carbon brush 22 and illustrates the arrangement of the groove 33 and the side walls 46, 48 of the carbon brush 22 securing the position of the support arm 30 of the spiral spring 26.
  • the function of the shut-off device 38 is that, with increasing wear, the lower edge of the shut-off device 38 can be stamp-free and supported by a compression spring 50 on the collector 20. If this case occurs when the upper wear limit is reached, the carbon brush 22 is pressed outward against the force of the spiral spring 26, so that contact between the current-carrying wire 40 and the commutator 20 is prevented. It switches the electric motor automatically turns off so that damage to 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)
  • Automatic Tool Replacement In Machine Tools (AREA)
  • Inorganic Insulating Materials (AREA)
  • Manipulator (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Brushes (AREA)

Abstract

L'invention concerne une machine-outil électrique (10) tenue à la main, comportant un moteur électrique (16), dont le commutateur (20) peut être raccordé à une source de tension par l'intermédiaire d'au moins un balai de charbon (22) plaqué contre le commutateur (20) par des éléments ressorts (26). Le balai de charbon (22) comprend une partie supérieure (34) et une partie inférieure (35), et comporte un cordon électrique (40) ainsi qu'un organe de mise hors circuit (38) qui coupe automatiquement la connexion électrique entre la source de tension et le commutateur (20) dans le cas d'une usure déterminée de la partie inférieure (35) du balai de charbon (22). L'invention vise à allonger la durée d'utilisation de ladite machine outil électrique entre les révisions nécessaires au changement du balai. A cet effet, le balai de charbon (22) est prolongé au niveau de sa partie supérieure (34) par une seule partie saillante axiale (36) qui sert de support pour l'organe de mise hors circuit (38) et qui est conçue de sorte que, entre les arêtes les plus à l'extérieur de la partie supérieure (34) et la partie saillante (36), à l'intérieur de ces arêtes extérieures, les éléments ressorts (26) pénètrent à fleur dans le contour extérieur du balai de charbon (22) de façon intégrée.
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 DE29716245U1 (de) 1997-09-10 1997-09-10 Elektrohandwerkzeugmaschine
DE29716245U 1997-09-10
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 true EP0937320A1 (fr) 1999-08-25
EP0937320B1 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)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20000223U1 (de) * 2000-01-10 2001-05-23 Robert Bosch Gmbh, 70469 Stuttgart 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
AU2002360675B2 (en) 2001-12-18 2008-02-21 Cutsforth, Inc. Brush holder adapted to be removed without stopping the machine
US6664701B1 (en) * 2002-06-13 2003-12-16 Black & Decker Inc. Brush assembly
US6858957B2 (en) * 2002-10-31 2005-02-22 Black & Decker Inc. Electric motor end plate with visual alignment indicia
US6798109B2 (en) * 2002-10-31 2004-09-28 Black & Decker Inc. Electric motor brush assembly
US6713916B1 (en) * 2002-10-31 2004-03-30 Black & Decker Inc. Electric motor assembly
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
DE102008041717A1 (de) * 2008-08-29 2010-03-04 Robert Bosch Gmbh Handwerkzeugmaschine mit Bürstenmotor
DE102008041716A1 (de) * 2008-08-29 2010-03-04 Robert Bosch Gmbh Handwerkzeugmaschine mit Bürstenmotor
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
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
CA3196289A1 (fr) 2020-11-04 2022-05-12 Robert S. Cutsforth Assemble porte-balais
US11996664B2 (en) 2020-12-01 2024-05-28 Cutsforth, Inc. Brush holder assembly

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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 (de) * 1987-07-07 1987-08-13 Ringsdorff-Werke GmbH, 5300 Bonn Abschaltbürste
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

Non-Patent Citations (1)

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Title
See references of WO9913538A1 *

Also Published As

Publication number Publication date
US6087754A (en) 2000-07-11
WO1999013538A1 (fr) 1999-03-18
EP0937320B1 (fr) 2004-10-13
ATE279797T1 (de) 2004-10-15
DE59812118D1 (de) 2004-11-18
DE29716245U1 (de) 1999-01-21
BR9806239A (pt) 2000-03-28

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