EP1016504B1 - Electric power tool, especially an angle grinder - Google Patents

Electric power tool, especially an angle grinder Download PDF

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Publication number
EP1016504B1
EP1016504B1 EP99122349A EP99122349A EP1016504B1 EP 1016504 B1 EP1016504 B1 EP 1016504B1 EP 99122349 A EP99122349 A EP 99122349A EP 99122349 A EP99122349 A EP 99122349A EP 1016504 B1 EP1016504 B1 EP 1016504B1
Authority
EP
European Patent Office
Prior art keywords
motor housing
handle
power tool
electric power
housing part
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
EP99122349A
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German (de)
French (fr)
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EP1016504A2 (en
EP1016504A3 (en
Inventor
Boris Rudolf
Manfred Fink
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.)
C&E Fein GmbH and Co
Original Assignee
C&E Fein GmbH and Co
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Filing date
Publication date
Priority claimed from DE19900404A external-priority patent/DE19900404A1/en
Application filed by C&E Fein GmbH and Co filed Critical C&E Fein GmbH and Co
Publication of EP1016504A2 publication Critical patent/EP1016504A2/en
Publication of EP1016504A3 publication Critical patent/EP1016504A3/en
Application granted granted Critical
Publication of EP1016504B1 publication Critical patent/EP1016504B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028Angle tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/005Auxiliary devices used in connection with portable grinding machines, e.g. holders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25FCOMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/008Cooling means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25FCOMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02Construction of casings, bodies or handles

Definitions

  • the invention relates to a power tool, in particular a Angle grinder, with an elongated motor housing in which a Electric motor is added, with a gearbox a first end of the motor housing for receiving a transmission for driving a work spindle, with a handle part, the is attached to a second end of the motor housing and in a handle switch is arranged, and with air intake slots on two opposite sides of the motor housing for cooling the electric motor.
  • Such a power tool is from Patent Abstracts of Japan, vol. 1998, No. 11, September 30, 1998 (1998-09-30) & JP 10 166 283 A (Ryobi Ltd.), 23 June 1998 (1998-06-23).
  • the known power tool is a Angle grinder with two hands on a stalk handle in the front area of the gearbox and on a rotatable Handle can be held at the rear end of the tool.
  • the handle is around the longitudinal axis of the housing in several Rotatable positions. Rotatable together with the handle is a housing part, provided on both sides of ventilation slots are.
  • the invention is based on the object a power tool according to the aforementioned type such to improve that the risk of contamination of the power tool is reduced.
  • This object is in a power tool according to the above mentioned type achieved in that a male element with a Base plate is provided which extends substantially over the Cross section of the motor housing extends and at the air intake slots each side facing a baffle plate for Particle deflection is provided.
  • the baffle plate designed as a cooling plate for cooling of electronic components.
  • the baffle plate in two ways exploited, namely on the one hand for the separation of dirt particles and other impurities and on the other for cooling of electronic components. This leads to a particularly favorable Heat dissipation of electronic components provided in the power tool and thus to a higher level of operational safety the same.
  • the motor housing at its the handle part facing end a circular passage for cable passage to the handle part, which is covered by the base plate of the insertion element, wherein inside the passage, a sealing element for air sealing is provided.
  • the handle part arranged rotatably relative to the motor housing.
  • the inventive arrangement is the Air intake slots outside the grip part in the motor housing of particular advantage, otherwise possibly sucked dirt particles could heavily soil the twisting mechanism and to a difficult twistability of the handle opposite could cause the motor housing.
  • an inventive power tool is in perspective represented and designated overall by the numeral 10.
  • the illustrated power tool 10 is a Angle grinder, the so-called two-hand angle grinder is executed and at its rear end a in total with the numeral 25 designated handle part, in a handle switch is provided (see Fig. 2).
  • a push button 28 is provided, whose Function will be explained in more detail below.
  • the power tool 10 further includes a total of the numeral 22, a motor housing, which is a front motor housing part 23 for receiving an electric motor 14, and a rear Motor housing part 24, to which the handle part 25th followed.
  • the front motor housing part 23 closes a transmission housing 12, in which a gear 16 for driving a work spindle is provided, which only with the numeral 18 is indicated schematically.
  • a receptacle 20 is also shown in FIG a stalk-shaped auxiliary handle can be screwed, so that the power tool 10 with a front hand on the auxiliary handle and held with a rear hand on the handle 25 can be.
  • a further receptacle for the auxiliary handle is provided so that the power tool 10 either for right-handed or left-handed operation suitable is.
  • Fig. 1 is provided in principle in an angle grinder Protective hood not shown for clarity.
  • the grip part 25 has a first, left handle housing part 26 and a second, right handle housing part 27 whose function will be explained in more detail below.
  • the grip part 25 can be seen from that shown in FIG Basic position in which the grip button 33 shown in FIG. 2 down points twice at an angle of 90 ° to the left, i. counterclockwise, twist and once out of the Fig. 1 illustrated basic position by 90 ° to the right, i. in the Turn clockwise.
  • This twisting possibility is a switch between one Rough grinding, where a surface with a grinding wheel is processed flat, and between a separating, in which a workpiece with the end face of a cutting disc is severed enabled. Furthermore, can be due to the possibility of twisting of the grip part 25 by 2 x 90 ° in one direction, i.e. 180 °, the handle switch on top of the Turn power tool 10. Such a grip position is in particular for working in rough grinding on ceilings and Ceiling projections advantageous.
  • Fig. 2 the handle part 25 is together with the rear motor housing part 24 is shown enlarged in a view, wherein the left handle housing part 26 is removed, so that the inner Structure, which is shown somewhat simplified, is recognizable.
  • the rear motor housing part 24 has an approximately circular Cross-section on (see Fig. 4) and is at its front end, which is connectable to the front motor housing part 23, cut off obliquely downwards, so that about an oblique Truncated cone yields.
  • On both sides of the rear motor housing part 24 is laterally a plurality of air intake slots 31 arranged one above the other and inside the rear motor housing part 24 at a short distance from the air intake slots 31 each have a baffle plate 30 is provided, the front End in Fig. 2 from the rear motor housing part 24 after front protruding recognizable.
  • the function of these baffles 30 will be explained in more detail below.
  • the rear motor housing part 24 has a central cylindrical Pin 44 which projects into the handle part 25 in.
  • This pin 44 serves as a passage 62 (see Fig. 4) for implementation electrical cable 50 between the motor housing and the Handle part and also serves as a pivot bearing for rotatable recording of the grip part 25 on the rear motor housing part 24.
  • Das Rear motor housing part 24 has a handle part 25 facing End face 21, with an annular flange 42 under Forming a gap 51 via radially extending webs 29th connected is.
  • This annular flange 42 has a slightly lower Outside diameter than the rear motor housing part 24 at his face 21, but has a much larger Diameter as the thus coaxial pin 44th
  • the annular flange 42 has a total of four radial recesses 43 on, each offset by an angle of 90 ° to each other are (see Fig. 4).
  • the handle part 25 by means of a Locking lever 54 in the predetermined by the recesses 43 Angular positions with the rear motor housing part 24th latched.
  • a locking lever 38 is provided, which at a Swivel axis 37 is pivotally received and as the first of the pivot axis 37 forward in the direction of the transmission housing 12 protruding part of the push button 28 has, at the front End a projection 41 is formed, which is aligned Alignment with a recess 43 is inserted into this.
  • the locking lever 38 also has a second, rigid with the push button 28 connected part, which is approximately at right angles to the push button 28 protrudes down and at his bottom end cooperates with the handle switch 32.
  • the handle switch 32 has a handle button 33, which at the rear lower end of the handle part 25 about a pivot axis 45 is pivotally fixed.
  • the grip key 33 acts with a Switch module 34, which is arranged above the handle button 33 is, wherein the handle button 33 by a spring 36 after is biased down and on a move up against one arranged on the underside of the switch module 34 Switching pin 35 for switching on and off of the electric motor 14th acts.
  • the grip button 33 has at its front, the rear motor housing part 24 facing end on the right and left side depending on an extension 59, which by a transverse web 46 on the outer End are connected to each other, so that in total at the front End of the handle button 43 is an approximately rectangular recess is formed, in which the lower end of the second part 39 of the Arret istshebels 38 is movable by a certain amount.
  • the projection 41 is aligned the push button 28 with one of the recesses 43, so that the Push button 28 already by pressing in the illustrated activation position could be transferred.
  • By pushing the button 28 could handle 33 with its crosspiece 46 on the projection 48 of the second part 39 of the locking lever over against the force of the spring 36 upwards be moved, so as to actuate the switch module 34 to the Switch on power tool 10.
  • the pushbutton 28 be released because a pivoting back of the locking lever 38 under the action of the spring 47 from its activation position is prevented in its rest position thereby that a front surface 49 of the second part 39 of the locking lever 38 abuts from the inside to the crossbar 46 of the handle button 33.
  • Fig. 2 is further at the lower end of the handle portion 25 of the locking lever 54 recognizable, with a receptacle 58 on a Pivot axis 55 of the second or right handle housing part 27 is received pivotally (see also Fig. 3).
  • This Locking lever 54 is biased by a spring 56, that he in alignment of the handle portion 25 with one of radial recesses 43 with a projection 57 in the relevant Recess 43 engages the rear motor housing part 24 and the handle 25 so against rotation relative to the rear motor housing part 24 locks.
  • the locking lever 54 causes a rotation of the Handle part 25 relative to the motor housing 22 only possible is when selectively the locking lever 54 is pressed. Subsequently the handle part 25 can be rotated until after one Twist by 90 ° or a multiple thereof the locking lever 54 again with a radial recess 43 of the annular flange 42 is aligned and the projection 57 of the locking lever 54 under the action of the spring 56 with its projection 57 engages in the radial recess 43 of the annular flange 42 and the handle member 25 locked against further rotation.
  • the function of locking the handle portion 25 in one of predetermined angular position on the motor housing 22 is on this Mode is decoupled from the function of the push button 28, as Switch-on lock against unintentional switching on of the Electric motor is used.
  • the grip part 25 is provided by both handle housing parts 26, 27 inwardly projecting webs 52, 53 on the pin 44 on the one hand and guided on the annular flange 42 on the other hand.
  • the right handle housing part 27 has two to each other parallel annular ridges 52, which has a first guide on cause the surface of the pin 44, and further at his the rear motor housing part 24 facing the end of a plurality of circumferentially extending annular ridge portions 53, the in the intermediate space 51 between the end face 21 and the annular flange 42 intervene.
  • annular flange 42 via individual radially extending ribs 29 is connected to the front side 21 of the rear motor housing part 24 is so results in a reduced contact surface of the Webs 53 and in conjunction with the mutually parallel Webs 52, which rest on the pin 44, an extremely Reliable rotary guide for the grip part 25 on the rear motor housing part 24, but with a relatively low frictional resistance.
  • a rotation angle limiter is provided by a Protrusion 60 on the right hand grip part 27 (see Fig. 3) and by a radial rib 61 (see Fig. 4) on the rear motor housing part 24 is formed, which is between the pin 44th and the outer edge of the annular flange 42 extends. This will be it avoided that the handle portion 25 in a direction of 360 ° or more can be turned.
  • Fig. 5 are the front motor housing part in an exploded view 23, the rear motor housing part 24 and a in the rear motor housing part 24 insertable insertion element 70 and accessories are shown and will be closer in the following explained.
  • the front motor housing part 23 serves to receive the electric motor 14.
  • the Inserted element 70 which is made of a on the Cross section of the motor housing part 24 extending base plate 72, with the electronic components 74 for controlling the Power tool 10 are shed and at the left and right side each one made of aluminum sheet baffle plate 30 protrudes forward.
  • baffles 30 meet what the Separation of dust particles and other impurities leads, if necessary, when working in a heavily polluted environment could be sucked in. (The air does not overflow illustrated air slots in the region of the transmission housing 12th out again). This arrangement has an advantageous effect on the life of the electric motor 14.
  • the baffles 30 are Furthermore, at the same time as a heat sink for individual electronic components 74 formed so that they sucked through the Air flow to be additionally cooled. This contributes to operational safety the electronic components 74 at.
  • the air intake slots 31 are now fluidly separated from the handle 25 in the rear Motor housing part 24 is provided.
  • the implementation is 62nd for the cables 50 connected to a connector 68 for connection to corresponding pins 40 provided on the switch module 34 are (see Fig. 3) through the base plate 72 of the insertion element 70 largely closed.
  • an elastic Sealing disk 76 is provided, which is attached to the cable 50 and together with these within the passage 62 of the pin 44 is to this in addition to a Seal rotation of the grip part 25.
  • the motor housing 22 in two parts with a front Motor housing part 23 and a rear motor housing part 24 is formed is, manufacturing and assembly is greatly simplified.
  • the insertion element 70 with the electronic components 74 and the baffles 30 is in the rear motor housing part 24 used while the electric motor 14 in the front part of the motor housing 23 is mounted; subsequently both components become by screwing in screws in the rear motor housing part 24 located screw holes 64 in screw receptacles 66 in shape of pins on the front motor housing part 23 firmly together connected.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The electric tool is provided with air suction slits (31), for the cooling of the electric motor (14), designed so that the air suction slits (31) are arranged at the second end of the motor housing (22). Facilities (72,76, fig.5) are provided for sealing the motor housing at its second end at the second end opposite the handle part (25). The handle part is rotatable, compared to the motor housing.

Description

Die Erfindung betrifft ein Elektrowerkzeug, insbesondere einen Winkelschleifer, mit einem länglichen Motorgehäuse, in dem ein Elektromotor aufgenommen ist, mit einem Getriebegehäuse an einem ersten Ende des Motorgehäuses zur Aufnahme eines Getriebes zum Antrieb einer Arbeitsspindel, mit einem Griffteil, das an einem zweiten Ende des Motorgehäuses befestigt ist und in dem ein Griffschalter angeordnet ist, und mit Luftansaugschlitzen an zwei einander gegenüberliegenden Seiten des Motorgehäuses zur Kühlung des Elektromotors. The invention relates to a power tool, in particular a Angle grinder, with an elongated motor housing in which a Electric motor is added, with a gearbox a first end of the motor housing for receiving a transmission for driving a work spindle, with a handle part, the is attached to a second end of the motor housing and in a handle switch is arranged, and with air intake slots on two opposite sides of the motor housing for cooling the electric motor.

Ein derartiges Elektrowerkzeug ist aus Patent Abstracts of Japan, vol. 1998, Nr. 11, 30. September 1998 (1998-09-30) & JP 10 166 283 A (Ryobi Ltd.), 23. Juni 1998 (1998-06-23) bekannt.Such a power tool is from Patent Abstracts of Japan, vol. 1998, No. 11, September 30, 1998 (1998-09-30) & JP 10 166 283 A (Ryobi Ltd.), 23 June 1998 (1998-06-23).

Bei dem bekannten Elektrowerkzeug handelt es sich um einen Winkelschleifer, der mit zwei Händen an einem Stielhandgriff im vorderen Bereich des Getriebegehäuses und an einem drehbaren Handgriff am hinteren Ende des Werkzeuges gehalten werden kann. Der Handgriff ist um die Längsachse des Gehäuses in mehrere Positionen verdrehbar. Gemeinsam mit dem Handgriff verdrehbar ist ein Gehäuseteil, an dem beidseits Lüftungsschlitze vorgesehen sind.In the known power tool is a Angle grinder with two hands on a stalk handle in the front area of the gearbox and on a rotatable Handle can be held at the rear end of the tool. The handle is around the longitudinal axis of the housing in several Rotatable positions. Rotatable together with the handle is a housing part, provided on both sides of ventilation slots are.

Ein weiteres Elektrowerkzeug, das Lüftungsschlitze im Bereich eines hinteren Handgriffes aufweist, ist aus der US-A-2 155 082 bekannt.Another power tool, the air vents in the area a rear handle is known from US-A-2,155,082 known.

Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, ein Elektrowerkzeug gemäß der eingangs genannten Art derart zu verbessern, daß die Gefahr einer Verschmutzung des Elektrowerkzeugs verringert wird.Against this background, the invention is based on the object a power tool according to the aforementioned type such to improve that the risk of contamination of the power tool is reduced.

Diese Aufgabe wird bei einem Elektrowerkzeug gemäß der eingangs genannten Art dadurch gelöst, daß ein Einschubelement mit einer Grundplatte vorgesehen ist, die sich im wesentlichen über den Querschnitt des Motorgehäuses erstreckt und an deren den Luftansaugschlitzen zugewandten Seiten je eine Prallplatte zur Partikelablenkung vorgesehen ist.This object is in a power tool according to the above mentioned type achieved in that a male element with a Base plate is provided which extends substantially over the Cross section of the motor housing extends and at the air intake slots each side facing a baffle plate for Particle deflection is provided.

Die Aufgabe der Erfindung wird auf diese Weise vollkommen gelöst. The object of the invention is completely solved in this way.

Denn auf diese Weise wird das Eindringen von Verunreinigungen in die empfindlichen Zonen des Elektrowerkzeugs deutlich vermindert. Dabei wird gleichzeitig die Verschmutzungsgefahr für den im Griffteil vorgesehenen Griffschalter vermindert und durch das Einschubelement eine günstige Montagemöglichkeit für Elektronikkomponenten im Kühlluftbereich gewährleistet. Because in this way is the penetration of impurities significantly reduced in the sensitive areas of the power tool. At the same time the risk of contamination for the gripping switch provided in the handle part is reduced and by the insertion element a cheap mounting option for Electronic components ensured in the cooling air area.

In zusätzlicher Weiterbildung der Erfindung ist die Prallplatte als Kühlblech zur Kühlung von Elektronikkomponenten ausgebildet.In an additional embodiment of the invention, the baffle plate designed as a cooling plate for cooling of electronic components.

Durch diese Maßnahme wird das Prallblech in zweifacher Weise ausgenutzt, nämlich zum einen zur Abscheidung von Schmutzpartikeln und sonstigen Verunreinigungen und zum anderen zur Kühlung von Elektronikkomponenten. Dies führt zu einer besonders günstigen Wärmeabfuhr von im Elektrowerkzeug vorgesehenen Elektronikkomponenten und damit zu einer höheren Betriebssicherheit derselben. By this measure, the baffle plate in two ways exploited, namely on the one hand for the separation of dirt particles and other impurities and on the other for cooling of electronic components. This leads to a particularly favorable Heat dissipation of electronic components provided in the power tool and thus to a higher level of operational safety the same.

In zusätzlicher Weiterbildung der Erfindung weist das Motorgehäuse an seiner dem Griffteil zugewandten Stirnseite einen kreisförmigen Durchlaß zur Kabeldurchführung zum Griffteil auf, der durch die Grundplatte des Einschubelementes abgedeckt ist, wobei innerhalb des Durchlasses ein Dichtelement zur Luftabdichtung vorgesehen ist.In an additional embodiment of the invention, the motor housing at its the handle part facing end a circular passage for cable passage to the handle part, which is covered by the base plate of the insertion element, wherein inside the passage, a sealing element for air sealing is provided.

Durch diese Maßnahme wird eine Abdichtung des Motorgehäuses gegenüber dem Griffteil selbst dann gewährleistet, wenn dieses am Motorgehäuse verdrehbar aufgenommen ist. Durch eine solche Abdichtung wird das Eindringen von Staub und sonstigen Schmutzpartikeln in dem Bereich des im Griffteil befindlichen Griffschalters vermieden, wodurch dessen Betriebssicherheit erhöht wird. By this measure, a seal of the motor housing opposite the handle part is guaranteed even if this on Motor housing is received rotatably. By such a seal is the penetration of dust and other dirt particles in the area of the handle switch located in the handle part avoided, thereby increasing its reliability becomes.

In zusätzlicher Weiterbildung der Erfindung ist das Griffteil gegenüber dem Motorgehäuse verdrehbar angeordnet. Durch eine derartige, im Stand der Technik an sich bekannte Maßnahme (vergleiche DE 195 46 328 A1) wird es ermöglicht, beispielsweise bei einem Winkelschleifer eine besonders ergonomische Haltung sowohl beim Schruppschleifen als auch beim Trennschleifen einzunehmen. Insbesondere wenn ein derartig verdrehbares Griffteil vorgesehen ist, ist die erfindungsgemäße Anordnung der Luftansaugschlitze außerhalb des Griffteils im Motorgehäuse von besonderem Vorteil, da sonst gegebenenfalls angesaugte Schmutzpartikel den Verdrehmechanismus stark verschmutzen könnten und zu einer schwer gängigen Verdrehbarkeit des Griffteils gegenüber dem Motorgehäuse führen könnten. In an additional embodiment of the invention, the handle part arranged rotatably relative to the motor housing. By a Such, known in the art per se measure (see DE 195 46 328 A1) it is possible, for example in an angle grinder a particularly ergonomic attitude both in rough grinding and in cutting take. In particular, if such a rotatable handle part is provided, the inventive arrangement is the Air intake slots outside the grip part in the motor housing of particular advantage, otherwise possibly sucked dirt particles could heavily soil the twisting mechanism and to a difficult twistability of the handle opposite could cause the motor housing.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels unter Bezugnahme auf die Zeichnung. Es zeigen:

Fig. 1
eine perspektivische Ansicht eines erfindungsgemäßen Elektrowerkzeuges am Beispiel eines Winkelschleifers;
Fig. 2
eine Ansicht des Elektrowerkzeuges gemäß Fig. 1, auf der lediglich das dem Griffteil zugewandte Ende des Motorgehäuses und das Griffteil erkennbar ist, wobei eine Gehäusehälfte des Griffteils abgenommen wurde;
Fig. 3
eine Explosionsdarstellung der rechten Gehäusehälfte des Griffteils mit Verriegelungstaste und zugehöriger Feder, sowie des Griffschalters, der mit dem Arretierungshebel zu einer Einheit montiert ist;
Fig. 4
eine Ansicht des Motorgehäuses vom Griffteil aus und
Fig. 5
eine Explosionsdarstellung des Motorgehäuses mit vorderem Motorgehäuseteil, hinterem Motorgehäuseteil und einem Einschubelement für das hintere Motorgehäuseteil nebst Zubehörteilen.
Further features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawings. Show it:
Fig. 1
a perspective view of a power tool according to the invention using the example of an angle grinder;
Fig. 2
a view of the power tool of Figure 1, on which only the handle part facing the end of the motor housing and the handle part is recognizable, wherein a housing half of the handle part has been removed.
Fig. 3
an exploded view of the right half of the handle portion with locking button and associated spring, and the handle switch, which is mounted with the locking lever to a unit;
Fig. 4
a view of the motor housing from the handle part and
Fig. 5
an exploded view of the motor housing with front motor housing part, rear motor housing part and a slide-in element for the rear motor housing part and accessories.

In Fig. 1 ist ein erfindungsgemäßes Elektrowerkzeug perspektivisch dargestellt und insgesamt mit der Ziffer 10 bezeichnet. Bei dem dargestellten Elektrowerkzeug 10 handelt es sich um einen Winkelschleifer, der als sogenannter Zweihand-Winkelschleifer ausgeführt ist und an seinem hinteren Ende ein insgesamt mit der Ziffer 25 bezeichnetes Griffteil aufweist, in dem ein Griffschalter vorgesehen ist (vgl. Fig. 2). Am oberen Ende des Griffteils ist eine Drucktaste 28 vorgesehen, deren Funktion im folgenden noch näher erläutert wird.In Fig. 1, an inventive power tool is in perspective represented and designated overall by the numeral 10. In the illustrated power tool 10 is a Angle grinder, the so-called two-hand angle grinder is executed and at its rear end a in total with the numeral 25 designated handle part, in a handle switch is provided (see Fig. 2). At the top End of the handle part, a push button 28 is provided, whose Function will be explained in more detail below.

Das Elektrowerkzeug 10 umfaßt ferner ein insgesamt mit der Ziffer 22 bezeichnetes Motorgehäuse, das ein vorderes Motorgehäuseteil 23 zur Aufnahme eines Elektromotors 14, sowie ein hinteres Motorgehäuseteil 24 aufweist, an den sich das Griffteil 25 anschließt. An das vordere Motorgehäuseteil 23 schließt sich ein Getriebegehäuse 12 an, in dem ein Getriebe 16 zum Antrieb einer Arbeitsspindel vorgesehen ist, die lediglich mit der Ziffer 18 schematisch angedeutet ist. Auf der linken Seite des Getriebegehäuses 12 ist ferner eine Aufnahme 20 dargestellt, in die ein stielförmiger Zusatzhandgriff einschraubbar ist, so daß das Elektrowerkzeug 10 mit einer vorderen Hand an dem Zusatzhandgriff und mit einer hinteren Hand am Griffteil 25 gehalten werden kann. Es versteht sich, daß auf der gegenüberliegenden rechten Seite des Getriebegehäuses 12 eine weitere Aufnahme für den Zusatzhandgriff vorgesehen ist, so daß das Elektrowerkzeug 10 wahlweise für einen Rechtshänder- oder einen Linkshänderbetrieb geeignet ist.The power tool 10 further includes a total of the numeral 22, a motor housing, which is a front motor housing part 23 for receiving an electric motor 14, and a rear Motor housing part 24, to which the handle part 25th followed. The front motor housing part 23 closes a transmission housing 12, in which a gear 16 for driving a work spindle is provided, which only with the numeral 18 is indicated schematically. On the left side of the gearbox 12, a receptacle 20 is also shown in FIG a stalk-shaped auxiliary handle can be screwed, so that the power tool 10 with a front hand on the auxiliary handle and held with a rear hand on the handle 25 can be. It is understood that on the opposite right side of the gear housing 12 a further receptacle for the auxiliary handle is provided so that the power tool 10 either for right-handed or left-handed operation suitable is.

In Fig. 1 ist die grundsätzlich bei einem Winkelschleifer vorgesehene Schutzhaube der Übersichtlichkeit halber nicht dargestellt.In Fig. 1 is provided in principle in an angle grinder Protective hood not shown for clarity.

Das Griffteil 25 weist ein erstes, linkes Griffgehäuseteil 26 und ein zweites, rechtes Griffgehäuseteil 27 auf, deren Funktion nachfolgend noch näher erläutert wird.The grip part 25 has a first, left handle housing part 26 and a second, right handle housing part 27 whose function will be explained in more detail below.

Das Griffteil 25 läßt sich aus der in Fig. 1 dargestellten Grundposition, in der die Grifftaste 33 gemäß Fig. 2 nach unten weist, zweimal um einen Winkel von jeweils 90° nach links, d.h. entgegen dem Uhrzeigersinn, verdrehen und einmal aus der in Fig. 1 dargestellten Grundstellung um 90° nach rechts, d.h. im Uhrzeigersinn verdrehen.The grip part 25 can be seen from that shown in FIG Basic position in which the grip button 33 shown in FIG. 2 down points twice at an angle of 90 ° to the left, i. counterclockwise, twist and once out of the Fig. 1 illustrated basic position by 90 ° to the right, i. in the Turn clockwise.

Durch diese Verdrehmöglichkeit ist ein Umstellen zwischen einem Schruppschleifen, bei dem eine Oberfläche mit einer Schleifscheibe flächig bearbeitet wird, und zwischen einem Trennen, bei dem ein Werkstück mit der Stirnfläche einer Trennscheibe durchtrennt wird, ermöglicht. Ferner läßt sich durch die Verdrehmöglichkeit des Griffteils 25 um 2 x 90° in eine Richtung, d.h. also um 180°, der Griffschalter auch auf die Oberseite des Elektrowerkzeugs 10 verdrehen. Eine solche Griffposition ist insbesondere zum Arbeiten beim Schruppschleifen an Decken und Deckenvorsprüngen von Vorteil.This twisting possibility is a switch between one Rough grinding, where a surface with a grinding wheel is processed flat, and between a separating, in which a workpiece with the end face of a cutting disc is severed enabled. Furthermore, can be due to the possibility of twisting of the grip part 25 by 2 x 90 ° in one direction, i.e. 180 °, the handle switch on top of the Turn power tool 10. Such a grip position is in particular for working in rough grinding on ceilings and Ceiling projections advantageous.

Der Verdrehmechanismus, der eine Verdrehung des Griffteils 25 gegenüber dem Motorgehäuse 22 und eine Verrastung in den vorgegebenen Winkelpositionen ermöglicht, wird im folgenden näher anhand der Fig. 2 bis 4 beschrieben.The twisting mechanism, the rotation of the handle portion 25th relative to the motor housing 22 and a lock in the given Angle positions will become closer in the following described with reference to FIGS. 2 to 4.

In Fig. 2 ist das Griffteil 25 zusammen mit dem hinteren Motorgehäuseteil 24 in einer Ansicht vergrößert dargestellt, wobei das linke Griffgehäuseteil 26 abgenommen ist, so daß der innere Aufbau, der etwas vereinfacht dargestellt ist, erkennbar ist.In Fig. 2, the handle part 25 is together with the rear motor housing part 24 is shown enlarged in a view, wherein the left handle housing part 26 is removed, so that the inner Structure, which is shown somewhat simplified, is recognizable.

Das hintere Motorgehäuseteil 24 weist einen etwa kreisförmigen Querschnitt auf (vgl. Fig. 4) und ist an seinem vorderen Ende, das mit dem vorderen Motorgehäuseteil 23 zusammenfügbar ist, schräg nach unten abgeschnitten, so daß sich etwa ein schräger Kegelstumpf ergibt. Auf beiden Seiten des hinteren Motorgehäuseteils 24 ist seitlich eine Mehrzahl von Luftansaugschlitzen 31 übereinander angeordnet und innerhalb des hinteren Motorgehäuseteils 24 in einem geringen Abstand von den Luftansaugschlitzen 31 jeweils eine Prallplatte 30 vorgesehen, deren vorderes Ende in Fig. 2 aus dem hinteren Motorgehäuseteil 24 nach vorne hervorstehend erkennbar ist. Die Funktion dieser Prallplatten 30 wird im folgenden noch näher erläutert.The rear motor housing part 24 has an approximately circular Cross-section on (see Fig. 4) and is at its front end, which is connectable to the front motor housing part 23, cut off obliquely downwards, so that about an oblique Truncated cone yields. On both sides of the rear motor housing part 24 is laterally a plurality of air intake slots 31 arranged one above the other and inside the rear motor housing part 24 at a short distance from the air intake slots 31 each have a baffle plate 30 is provided, the front End in Fig. 2 from the rear motor housing part 24 after front protruding recognizable. The function of these baffles 30 will be explained in more detail below.

Das hintere Motorgehäuseteil 24 weist einen zentralen zylindrischen Zapfen 44 auf, der in das Griffteil 25 hinein vorsteht. Dieser Zapfen 44 dient als Durchlaß 62 (vgl. Fig. 4) zur Durchführung elektrischer Kabel 50 zwischen dem Motorgehäuse und dem Griffteil und dient ferner als Drehlager zur verdrehbaren Aufnahme des Griffteils 25 am hinteren Motorgehäuseteil 24. Das hintere Motorgehäuseteil 24 weist eine dem Griffteil 25 zugewandte Stirnfläche 21 auf, mit der ein Ringflansch 42 unter Bildung eines Zwischenraums 51 über radial verlaufende Stege 29 verbunden ist. Dieser Ringflansch 42 weist einen etwas geringeren Außendurchmesser als das hintere Motorgehäuseteil 24 an seiner Stirnfläche 21 auf, besitzt jedoch einen deutlich größeren Durchmesser als der damit koaxiale Zapfen 44.The rear motor housing part 24 has a central cylindrical Pin 44 which projects into the handle part 25 in. This pin 44 serves as a passage 62 (see Fig. 4) for implementation electrical cable 50 between the motor housing and the Handle part and also serves as a pivot bearing for rotatable recording of the grip part 25 on the rear motor housing part 24. Das Rear motor housing part 24 has a handle part 25 facing End face 21, with an annular flange 42 under Forming a gap 51 via radially extending webs 29th connected is. This annular flange 42 has a slightly lower Outside diameter than the rear motor housing part 24 at his face 21, but has a much larger Diameter as the thus coaxial pin 44th

Der Ringflansch 42 weist insgesamt vier radiale Aussparungen 43 auf, die jeweils um einen Winkel von 90° zueinander versetzt sind (vgl. Fig. 4).The annular flange 42 has a total of four radial recesses 43 on, each offset by an angle of 90 ° to each other are (see Fig. 4).

An diesen Aussparungen 43 ist das Griffteil 25 mit Hilfe eines Verriegelungshebels 54 in den durch die Aussparungen 43 vorgegebenen Winkelpositionen mit dem hinteren Motorgehäuseteil 24 verrastbar.At these recesses 43, the handle part 25 by means of a Locking lever 54 in the predetermined by the recesses 43 Angular positions with the rear motor housing part 24th latched.

Ferner ist ein Arretierungshebel 38 vorgesehen, der an einer Schwenkachse 37 schwenkbar aufgenommen ist und als ersten von der Schwenkachse 37 nach vorn in Richtung des Getriebegehäuses 12 abstehenden Teil die Drucktaste 28 aufweist, an deren vorderen Ende ein Vorsprung 41 angeformt ist, die bei fluchtender Ausrichtung mit einer Aussparung 43 in diesen einführbar ist. Der Arretierungshebel 38 weist ferner einen zweiten, starr mit der Drucktaste 28 verbundenen Teil auf, der etwa rechtwinklig zu der Drucktaste 28 nach unten hervorsteht und der an seinem unteren Ende mit dem Griffschalter 32 zusammenwirkt.Further, a locking lever 38 is provided, which at a Swivel axis 37 is pivotally received and as the first of the pivot axis 37 forward in the direction of the transmission housing 12 protruding part of the push button 28 has, at the front End a projection 41 is formed, which is aligned Alignment with a recess 43 is inserted into this. The locking lever 38 also has a second, rigid with the push button 28 connected part, which is approximately at right angles to the push button 28 protrudes down and at his bottom end cooperates with the handle switch 32.

Der Griffschalter 32 weist eine Grifftaste 33 auf, die am hinteren unteren Ende des Griffteils 25 um eine Schwenkachse 45 verschwenkbar festgelegt ist. Die Grifftaste 33 wirkt mit einem Schaltermodul 34 zusammen, das oberhalb der Grifftaste 33 angeordnet ist, wobei die Grifftaste 33 durch eine Feder 36 nach unten vorgespannt ist und bei einer Bewegung nach oben gegen einen an der Unterseite des Schaltermoduls 34 angeordneten Schaltstift 35 zum Ein- und Ausschalten des Elektromotors 14 wirkt.The handle switch 32 has a handle button 33, which at the rear lower end of the handle part 25 about a pivot axis 45 is pivotally fixed. The grip key 33 acts with a Switch module 34, which is arranged above the handle button 33 is, wherein the handle button 33 by a spring 36 after is biased down and on a move up against one arranged on the underside of the switch module 34 Switching pin 35 for switching on and off of the electric motor 14th acts.

Die Grifftaste 33 weist an ihrem vorderen, dem hinteren Motorgehäuseteil 24 zugewandten Ende an der rechten und linken Seite je einen Fortsatz 59 auf, die durch einen Quersteg 46 am äußeren Ende miteinander verbunden sind, so daß insgesamt am vorderen Ende der Grifftaste 43 eine etwa rechteckförmige Ausnehmung gebildet ist, in der das untere Ende des zweiten Teils 39 des Arretierungshebels 38 um einen gewissen Betrag beweglich ist.The grip button 33 has at its front, the rear motor housing part 24 facing end on the right and left side depending on an extension 59, which by a transverse web 46 on the outer End are connected to each other, so that in total at the front End of the handle button 43 is an approximately rectangular recess is formed, in which the lower end of the second part 39 of the Arretierungshebels 38 is movable by a certain amount.

An seinem unteren Ende weist der zweite Teil 39 des Arretierungshebels 38 einen Vorsprung 48 auf, der als Anschlag für den Quersteg 46 der Grifftaste 33 dient.At its lower end, the second part 39 of the locking lever 38 a projection 48 which serves as a stop for the Cross bar 46 of the handle button 33 is used.

Der Arretierungshebel 38 ist durch eine Feder 47, die auf den zweiten Teil 39 wirkt, derart vorgespannt, daß der Arretierungshebel 38 in der Darstellung gemäß Fig. 2 im Uhrzeigersinn beaufschlagt wird, so daß die Drucktaste 28 nach oben vorgespannt ist.The locking lever 38 is by a spring 47 which on the second part 39 acts, biased so that the locking lever 38 in the illustration of FIG. 2 in a clockwise direction is applied, so that the push button 28 biased upward is.

In der in Fig. 2 gezeigten Stellung fluchtet der Vorsprung 41 der Drucktaste 28 mit einer der Aussparungen 43, so daß die Drucktaste 28 bereits durch Eindrücken in die dargestellte Aktivierungsstellung überführt werden konnte. Durch das Eindrükken der Drucktaste 28 konnte die Grifftaste 33 mit ihrem Quersteg 46 an dem Vorsprung 48 des zweiten Teils 39 des Arretierungshebels vorbei entgegen der Kraft der Feder 36 nach oben bewegt werden, um so das Schaltermodul 34 zu betätigen, um das Elektrowerkzeug 10 einzuschalten. In the position shown in Fig. 2, the projection 41 is aligned the push button 28 with one of the recesses 43, so that the Push button 28 already by pressing in the illustrated activation position could be transferred. By pushing the button 28 could handle 33 with its crosspiece 46 on the projection 48 of the second part 39 of the locking lever over against the force of the spring 36 upwards be moved, so as to actuate the switch module 34 to the Switch on power tool 10.

Ist diese Stellung einmal erreicht, so kann die Drucktaste 28 losgelassen werden, da ein Rückschwenken des Arretierungshebels 38 unter Wirkung der Kraft der Feder 47 aus seiner Aktivierungsstellung in seine Ruhestellung dadurch verhindert wird, daß eine Vorderfläche 49 des zweiten Teils 39 des Arretierungshebels 38 von innen an den Quersteg 46 der Grifftaste 33 anschlägt.Once this position has been reached, the pushbutton 28 be released because a pivoting back of the locking lever 38 under the action of the spring 47 from its activation position is prevented in its rest position thereby that a front surface 49 of the second part 39 of the locking lever 38 abuts from the inside to the crossbar 46 of the handle button 33.

Es ergibt sich somit eine Dauerbetriebsstellung, in der lediglich die Grifftaste 33 weiter angezogen gehalten werden muß, um ein ständiges Arbeiten mit dem Elektrowerkzeug 10 zu ermöglichen.This results in a continuous operation position in which only the grip button 33 must be kept tightened to to allow a constant work with the power tool 10.

Wird aus dieser in Fig. 2 gezeigten Position nunmehr die Grifftaste 33 losgelassen, so bewegt sich die Grifftaste 33 unter der Wirkung der Feder 36 nach unten, so daß ihr Quersteg 46 an dem Vorsprung 48 des zweiten Teils 39 des Arretierungshebels 38 vorbei bewegt wird und sich nunmehr der Arretierungshebel 38 aus seiner Aktivierungsstellung unter der Wirkung der Feder 47 in seine Ruhestellung oder Ausgangsstellung verschwenkt. Ist diese Stellung eingenommen, so kann die Grifftaste 33 nicht mehr nach oben bewegt werden, da der Quersteg 46 an dem Vorsprung 48 des zweiten Teils 39 des Arretierungshebels 38 anschlägt.From this position shown in Fig. 2 now the handle key 33 is released, the handle button 33 moves under the action of the spring 36 down so that its crosspiece 46 at the projection 48 of the second part 39 of the locking lever 38th is moved past and now the locking lever 38th from its activation position under the action of the spring 47 pivoted to its rest position or starting position. is taken this position, the handle button 33 can not be moved up more, since the crossbar 46 on the projection 48 of the second part 39 of the locking lever 38 abuts.

Soll der Motor eingeschaltet werden, so muß also zunächst die Drucktaste 28 gedrückt werden, wodurch sich der Arretierungshebel 38 gemäß Fig. 2 entgegen dem Uhrzeigersinn verschwenkt, so daß nunmehr die Grifftaste 33 mit ihrem Quersteg 46 an dem Vorsprung 48 vorbei nach oben verschwenkt werden kann, um den Schaltstift 35 des Schaltermoduls 34 zu betätigen. If the engine is turned on, so must first Push button 28 are pressed, causing the locking lever 38 pivoted in FIG. 2 counterclockwise, so that now the handle button 33 with its crosspiece 46 on the projection 48 can be swiveled over to the top Switching pin 35 of the switch module 34 to operate.

In Fig. 2 ist ferner am unteren Ende des Griffteils 25 der Verriegelungshebel 54 erkennbar, der mit einer Aufnahme 58 an einer Schwenkachse 55 des zweiten oder rechten Griffgehäuseteils 27 verschwenkbar aufgenommen ist (vgl. auch Fig. 3). Dieser Verriegelungshebel 54 ist durch eine Feder 56 derart vorgespannt, daß er bei Ausrichtung des Griffteils 25 mit einer der radialen Aussparungen 43 mit einem Vorsprung 57 in die betreffende Aussparung 43 am hinteren Motorgehäuseteil 24 eingreift und das Griffteil 25 so gegen eine Verdrehung gegenüber dem hinteren Motorgehäuseteil 24 sperrt.In Fig. 2 is further at the lower end of the handle portion 25 of the locking lever 54 recognizable, with a receptacle 58 on a Pivot axis 55 of the second or right handle housing part 27 is received pivotally (see also Fig. 3). This Locking lever 54 is biased by a spring 56, that he in alignment of the handle portion 25 with one of radial recesses 43 with a projection 57 in the relevant Recess 43 engages the rear motor housing part 24 and the handle 25 so against rotation relative to the rear motor housing part 24 locks.

Der Verriegelungshebel 54 bewirkt, daß eine Verdrehung des Griffteils 25 gegenüber dem Motorgehäuse 22 nur dann möglich ist, wenn gezielt der Verriegelungshebel 54 gedrückt wird. Anschließend kann das Griffteil 25 verdreht werden, bis nach einer Verdrehung um 90° oder ein Vielfaches davon der Verriegelungshebel 54 wieder mit einer radialen Aussparung 43 des Ringflansches 42 ausgerichtet ist und der Vorsprung 57 des Verriegelungshebels 54 unter Wirkung der Feder 56 mit ihrem Vorsprung 57 in die radiale Aussparung 43 des Ringflansches 42 eingreift und das Griffteil 25 gegen eine weitere Verdrehung verriegelt. Die Funktion der Arretierung des Griffteils 25 in einer der vorgegebenen Winkelposition am Motorgehäuse 22 wird auf diese Weise von der Funktion der Drucktaste 28 entkoppelt, die als Einschaltsperre gegen ein unbeabsichtigtes Einschalten des Elektromotors dient.The locking lever 54 causes a rotation of the Handle part 25 relative to the motor housing 22 only possible is when selectively the locking lever 54 is pressed. Subsequently the handle part 25 can be rotated until after one Twist by 90 ° or a multiple thereof the locking lever 54 again with a radial recess 43 of the annular flange 42 is aligned and the projection 57 of the locking lever 54 under the action of the spring 56 with its projection 57 engages in the radial recess 43 of the annular flange 42 and the handle member 25 locked against further rotation. The function of locking the handle portion 25 in one of predetermined angular position on the motor housing 22 is on this Mode is decoupled from the function of the push button 28, as Switch-on lock against unintentional switching on of the Electric motor is used.

Das Griffteil 25 ist durch von beiden Griffgehäuseteilen 26, 27 nach innen hervorstehende Stege 52, 53 an dem Zapfen 44 einerseits und an dem Ringflansch 42 andererseits geführt. Wie in Fig. 3 erkennbar, weist das rechte Griffgehäuseteil 27 zwei zueinander parallele Ringstege 52 auf, die eine erste Führung auf der Oberfläche des Zapfens 44 bewirken, sowie ferner an seinem dem hinteren Motorgehäuseteil 24 zugewandten Ende eine Mehrzahl von in Umfangsrichtung verlaufenden Ringstegabschnitten 53, die in den Zwischenraum 51 zwischen der Stirnseite 21 und dem Ringflansch 42 eingreifen.The grip part 25 is provided by both handle housing parts 26, 27 inwardly projecting webs 52, 53 on the pin 44 on the one hand and guided on the annular flange 42 on the other hand. As in Fig. 3 can be seen, the right handle housing part 27 has two to each other parallel annular ridges 52, which has a first guide on cause the surface of the pin 44, and further at his the rear motor housing part 24 facing the end of a plurality of circumferentially extending annular ridge portions 53, the in the intermediate space 51 between the end face 21 and the annular flange 42 intervene.

Da der Ringflansch 42 über einzelne radial verlaufende Rippen 29 mit der Stirnseite 21 des hinteren Motorgehäuseteils 24 verbunden ist, ergibt sich so eine verringerte Auflagefläche der Stege 53 und in Verbindung mit den parallel zueinander verlaufenden Stegen 52, die auf dem Zapfen 44 aufliegen, eine äußerst zuverlässige Drehführung für das Griffteil 25 am hinteren Motorgehäuseteil 24, jedoch mit einem relativ geringen Reibungswiderstand.Since the annular flange 42 via individual radially extending ribs 29 is connected to the front side 21 of the rear motor housing part 24 is so results in a reduced contact surface of the Webs 53 and in conjunction with the mutually parallel Webs 52, which rest on the pin 44, an extremely Reliable rotary guide for the grip part 25 on the rear motor housing part 24, but with a relatively low frictional resistance.

Zwischen dem Griffteil 25 und dem hinteren Motorgehäuseteil 24 ist ferner eine Drehwinkelbegrenzung vorgesehen, die durch einen Vorsprung 60 am rechten Griffgehäuseteil 27 (vgl. Fig. 3) und durch eine Radialrippe 61 (vgl. Fig. 4) am hinteren Motorgehäuseteil 24 gebildet ist, die sich zwischen dem Zapfen 44 und dem äußeren Rand des Ringflansches 42 erstreckt. Damit wird es vermieden, daß das Griffteil 25 in eine Richtung um 360° oder mehr gedreht werden kann.Between the handle part 25 and the rear motor housing part 24 Furthermore, a rotation angle limiter is provided by a Protrusion 60 on the right hand grip part 27 (see Fig. 3) and by a radial rib 61 (see Fig. 4) on the rear motor housing part 24 is formed, which is between the pin 44th and the outer edge of the annular flange 42 extends. This will be it avoided that the handle portion 25 in a direction of 360 ° or more can be turned.

In Fig. 5 sind in einer Explosionsdarstellung das vordere Motorgehäuseteil 23, das hintere Motorgehäuseteil 24 sowie ein in das hintere Motorgehäuseteil 24 einschiebbares Einschubelement 70 nebst Zubehörteilen dargestellt und werden im folgenden näher erläutert. In Fig. 5 are the front motor housing part in an exploded view 23, the rear motor housing part 24 and a in the rear motor housing part 24 insertable insertion element 70 and accessories are shown and will be closer in the following explained.

Das vordere Motorgehäuseteil 23 dient zur Aufnahme des Elektromotors 14. Dagegen wird im hinteren Motorgehäuseteil 24 das Einschubelement 70 aufgenommen, das aus einer sich über den Querschnitt des Motorgehäuseteils 24 erstreckenden Grundplatte 72 besteht, mit der Elektronikkomponenten 74 zur Steuerung des Elektrowerkzeuges 10 vergossen sind und an deren linker und rechter Seite je eine aus Aluminiumblech bestehende Prallplatte 30 nach vorne hervorsteht.The front motor housing part 23 serves to receive the electric motor 14. In contrast, in the rear motor housing part 24 the Inserted element 70, which is made of a on the Cross section of the motor housing part 24 extending base plate 72, with the electronic components 74 for controlling the Power tool 10 are shed and at the left and right side each one made of aluminum sheet baffle plate 30 protrudes forward.

Beim Betrieb des Elektrowerkzeugs 10 wird über die Luftschlitze 31 an beiden Seiten des hinteren Motorgehäuseteils 24 Kühlluft angesaugt, die zunächst auf die unmittelbar hinter den Luftansaugschlitzen 31 angeordneten Prallplatten 30 trifft, was zur Abscheidung von Staubpartikeln und anderen Verunreinigungen führt, die ggf. beim Arbeiten in einer stark verschmutzten Umgebung mit angesaugt werden könnten. (Die Luft tritt über nicht dargestellte Luftschlitze im Bereich des Getriebegehäuses 12 wieder aus). Diese Anordnung wirkt sich vorteilhaft auf die Lebensdauer des Elektromotors 14 aus. Die Prallplatten 30 sind ferner gleichzeitig als Kühlkörper für einzelne der Elektronikkomponenten 74 ausgebildet, so daß diese durch den angesaugten Luftstrom zusätzlich gekühlt werden. Dies trägt zur Betriebssicherheit der Elektronikkomponenten 74 bei.During operation of the power tool 10 is via the louvers 31 on both sides of the rear motor housing part 24 cooling air sucked in, the first on the immediately behind the air intake slots 31 arranged baffles 30 meets what the Separation of dust particles and other impurities leads, if necessary, when working in a heavily polluted environment could be sucked in. (The air does not overflow illustrated air slots in the region of the transmission housing 12th out again). This arrangement has an advantageous effect on the life of the electric motor 14. The baffles 30 are Furthermore, at the same time as a heat sink for individual electronic components 74 formed so that they sucked through the Air flow to be additionally cooled. This contributes to operational safety the electronic components 74 at.

Während sich bei herkömmlichen Winkelschleifern die Luftansaugschlitze bisher im Griffteil 25, d.h. in unmittelbarer Nähe des Griffschalters 32 befanden, sind die Luftansaugschlitze 31 nunmehr strömungstechnisch vom Griffteil 25 getrennt im hinteren Motorgehäuseteil 24 vorgesehen. Dabei wird die Durchführung 62 für die Kabel 50, die mit einem Stecker 68 zur Verbindung mit entsprechenden Anschlußstiften 40 am Schaltermodul 34 versehen sind (vgl. Fig. 3) durch die Grundplatte 72 des Einschubelementes 70 weitgehend verschlossen. Zusätzlich ist eine elastische Dichtscheibe 76 vorgesehen, die auf die Kabel 50 aufgesteckt wird und sich zusammen mit diesen innerhalb des Durchlasses 62 des Zapfens 44 befindet, um diesen zusätzlich auch bei einer Verdrehung des Griffteils 25 abzudichten.While in conventional angle grinders the air intake slots previously in the handle part 25, i. in the immediate vicinity of Handle switch 32 were, the air intake slots 31 are now fluidly separated from the handle 25 in the rear Motor housing part 24 is provided. In this case, the implementation is 62nd for the cables 50 connected to a connector 68 for connection to corresponding pins 40 provided on the switch module 34 are (see Fig. 3) through the base plate 72 of the insertion element 70 largely closed. In addition, an elastic Sealing disk 76 is provided, which is attached to the cable 50 and together with these within the passage 62 of the pin 44 is to this in addition to a Seal rotation of the grip part 25.

Auf diese Weise wird es vermieden, daß verschmutzte Luft in den Bereich des Griffschalters 32 gelangt und somit dessen Funktion vorzeitig beeinträchtigt.In this way it is avoided that polluted air in the Area of the handle switch 32 passes and thus its function impaired prematurely.

Dadurch, daß das Motorgehäuse 22 zweiteilig mit einem vorderen Motorgehäuseteil 23 und einem hinteren Motorgehäuseteil 24 ausgebildet ist, wird die Herstellung und Montage erheblich vereinfacht. Das Einschubelement 70 mit den Elektronikkomponenten 74 und den Prallplatten 30 wird in das hintere Motorgehäuseteil 24 eingesetzt, während der Elektromotor 14 im vorderen Motorgehäuseteil 23 montiert wird; anschließend werden beide Komponenten durch Eindrehen von Schrauben im hinteren Motorgehäuseteil 24 befindliche Schraublöcher 64 in Schraubaufnahmen 66 in Form von Zapfen am vorderen Motorgehäuseteil 23 fest miteinander verbunden.Characterized in that the motor housing 22 in two parts with a front Motor housing part 23 and a rear motor housing part 24 is formed is, manufacturing and assembly is greatly simplified. The insertion element 70 with the electronic components 74 and the baffles 30 is in the rear motor housing part 24 used while the electric motor 14 in the front part of the motor housing 23 is mounted; subsequently both components become by screwing in screws in the rear motor housing part 24 located screw holes 64 in screw receptacles 66 in shape of pins on the front motor housing part 23 firmly together connected.

Claims (5)

  1. Electric power tool, in particular angle grinder, having an elongated motor housing (22) within which an electric motor (14) is received, having a gear drive housing (12) attached to a first end of the motor housing (22) for receiving a gear drive (16) for driving a working spindle (18), having a handle element (25) which is attached to a second end of the motor housing (22) and within which a grip switch (32) is received, and further having air intake slots (31) at two sides of the motor housing (22) opposing each other for cooling the electric motor (14), characterized in that an insert element (70) is provided having a base plate (72) which substantially extends across the cross-section of the motor housing (22) the base plate carrying a baffle plate (30) for particle deflection on each side facing toward the air intake slots (31).
  2. Electric power tool according to claim 1, characterized in that at least one of the baffle plates (30) is configured as a cooling sheet for cooling electronic components (74).
  3. Electric power tool according to claim 1 or 2, characterized in that the motor housing (22) at its front face (21) facing the handle element (25) has a circular lead-through (62) for the passage of cables to the handle element (25) being covered by the base plate (72) of the insert element (70), and in that within the lead-through (62) a sealing element (76) is provided for air sealing.
  4. Electric power tool according to any of the preceding claims, characterized in that means (72, 76) are provided for sealing the motor housing (22) at its second end against the handle element (25).
  5. Electric power tool according to any of the preceding claims, characterized in that the handle element (25) is rotatable with respect to the motor housing (22).
EP99122349A 1998-12-31 1999-11-10 Electric power tool, especially an angle grinder Expired - Lifetime EP1016504B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19860846 1998-12-31
DE19860846 1998-12-31
DE19900404 1999-01-08
DE19900404A DE19900404A1 (en) 1998-12-31 1999-01-08 Power tool, especially angle grinder

Publications (3)

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EP1016504A2 EP1016504A2 (en) 2000-07-05
EP1016504A3 EP1016504A3 (en) 2002-12-11
EP1016504B1 true EP1016504B1 (en) 2005-01-19

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EP99122349A Expired - Lifetime EP1016504B1 (en) 1998-12-31 1999-11-10 Electric power tool, especially an angle grinder

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US (1) US6602122B1 (en)
EP (1) EP1016504B1 (en)
AT (1) ATE287319T1 (en)
ES (1) ES2235423T3 (en)

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US7988538B2 (en) 2006-10-13 2011-08-02 Black & Decker Inc. Large angle grinder

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ES2235423T3 (en) 2005-07-01
ATE287319T1 (en) 2005-02-15
US6602122B1 (en) 2003-08-05
EP1016504A3 (en) 2002-12-11

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