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EP1129822B1 - Orbital sander - Google Patents

Orbital sander Download PDF

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Publication number
EP1129822B1
EP1129822B1 EP01101595A EP01101595A EP1129822B1 EP 1129822 B1 EP1129822 B1 EP 1129822B1 EP 01101595 A EP01101595 A EP 01101595A EP 01101595 A EP01101595 A EP 01101595A EP 1129822 B1 EP1129822 B1 EP 1129822B1
Authority
EP
European Patent Office
Prior art keywords
grinding
disc
gearing
eccentric
sanding
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
EP01101595A
Other languages
German (de)
French (fr)
Other versions
EP1129822A1 (en
Inventor
Alfred Binder
Siegbert Gaiser
Roman Trinks
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.)
Kress Elektrik GmbH and Co Elektromotorenfabrik
Original Assignee
Kress Elektrik GmbH and Co Elektromotorenfabrik
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.)
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Publication date
Application filed by Kress Elektrik GmbH and Co Elektromotorenfabrik filed Critical Kress Elektrik GmbH and Co Elektromotorenfabrik
Priority to SI200130011T priority Critical patent/SI1129822T1/en
Publication of EP1129822A1 publication Critical patent/EP1129822A1/en
Application granted granted Critical
Publication of EP1129822B1 publication Critical patent/EP1129822B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools

Definitions

  • the invention relates to an eccentric disc grinder, in which driving the sanding pad unit Gear parts against the ingress of grinding dust are sealed according to the preamble of claim 1.
  • An eccentric disc grinder also goes, for example also from DE 36 25 671 C1.
  • This Eccentric disc grinder becomes the seal of one rubber-elastic, attached to the machine housing Wrinkled membrane formed, which rotates about a bearing the drive shaft or the sanding pad of the Sanding pad unit sits and the machine housing concludes above the sanding plate.
  • DE 4023464 A is a motor-driven Hand grinder protruding, where the accumulating dust by means of a suction device via Staubabsaugkanäle is sucked, which traverse the grinding element and in a sealed to the outside Staubabsaugraum open above the grinding element.
  • the invention is based on the problem, a generic Exzentertellerschleifer so to further develop, on the one hand, an optimal and easy to manufacture seal the gear and Drive parts, on the other hand, a self-extraction of Sanding dust is possible.
  • the arranged in the gear cover element Air guide made possible by optimal air line a high suction efficiency.
  • the sealing element releasably attached to the Fastening gear cover element is not only a very fast assembly allows, but especially a very quick dismantling, For example, the sealing element at a To replace damage.
  • the sealing element is designed as a sealing bellows, the at one, provided on the sanding plate holder Support ring and at least one attachment dome releasably secured to the transmission lid member are arranged projecting towards the sanding pad, the attachment via a support ring and a Sliding ring on which the sealing element by means of a Ring spring takes place.
  • the attachment to the Fastening dome happens through a tension wire.
  • the air guide element for Sanding plate facing annular projection having.
  • the annular projection are preferably arranged uniformly distributed over the circumference Openings provided which the Schleifstaubabsaugung optimize.
  • Figure 1 is schematically the lower part of a Exzentertellerschleifers shown, wherein the better overview of the sanding plates and the housing of the eccentric disc grinder have been omitted.
  • Fig. 2 shows a partially sectioned perspective view of the gear cover element with attached elements of the Exzentertellerantriebs.
  • FIG. 3 is finally a sectional view of a Exzentertellerantriebs one of the invention use revealing eccentric disc grinder.
  • a housing 30 of an eccentric disc grinder (see FIG. Fig. 3) is on its the grinding plate 35th facing side by a gear cover element. 1 completed.
  • a gear cover element 1 On the gear cover element 1 is a elastic flow guide 2, for example, by Arranged arranged, which one to the sanding plate 35 facing projection 2a has.
  • This Flow guide 2 allows for a optimal extraction of the grinding process Grinding dust, on the other hand it serves as a braking element for Deceleration of the grinding plate 35 in detail below to be described Fritechnischsmitmpletique.
  • Centric in the gear cover element element 1 is also designated as a whole with 13 Grinding plate receiving arranged (see also FIG. 1 and Fig. 2).
  • This sanding pad receptacle 13 has a Outboard spur gear 13a on which in itself known manner in a mecanicstirntechnikrad 33, which in the housing 30 of the eccentric disc grinder rotatably but axially displaceable, rolls.
  • a Rotary bearing for example, a deep groove ball bearing 6th by means of a securing ring 8, as well as a needle sleeve 7 attached.
  • the deep groove ball bearing 6 and the needle sleeve 7 serve the rotatable recording of Sanding plate 35.
  • a Slip ring 5 and a support ring 3 is fixed, wherein the Support ring 3, for example, an aluminum alloy whereas the slide ring is a steel part.
  • the slide ring 5 and the support ring 3 are on one the sanding plate holder 13 provided recording pressed.
  • a second sealing element 4 is fixed, for example by provided on the sealing element 4 lips 4a, which are adapted to the slide ring 5.
  • the second sealing element 4 is detachably fastened, for example by means of a tension wire 9, to a fastening dome 16, which is arranged projecting on the gear cover 1 toward the sanding pad.
  • the gear cover element 1 is sealed to the housing 30 by a sealing element 1c.
  • the rotatably mounted in the housing 30 inner spur gear 33 is on the outer spur gear 13a, which with the sanding pad 35 is connected, adapted that it can roll in the internal spur gear 33.
  • the sanding pad 35 forms together with the Sanding plate holder 13 and the outer end gear 13a an assembly, for example by means of a nut 31 is attached to the transmission lid member 1 as it is From Fig. 3 shows.
  • the outer spur gear 13a is arranged on an eccentric shaft 40, of an electric motor (not shown) on known manner is driven.
  • the internal spur gear 33 is connected by a shift linkage 51, which is actuatable by a switch button 50, in the axial direction against the restoring force of Synchronization springs 34 displaced.
  • the Adjustment corresponds to that of DE 197 27 700 A1 to which reference is made in the present case.
  • the Synchronization compression springs 34 not only allow a stabilization of the internal spur gear 33 in one predetermined position, but also one synchronized engagement of the outer spur gear 13a in the internal spur gear 33. Through the Synchronization springs 34 may also be minor Position inaccuracies of the outer spur gear 13a and the Inner spur gear 33 can be compensated.
  • the Exzentertellerschleifer has essentially two Switching positions.
  • the air guide element 2 is used the optimal guidance of the suction air flow, with the Grinding dust by the in the gear cover element. 1 provided openings 1a is removed. to Optimization of this exhaust air flow are in the annular projection 2a substantially over the Scope equally distributed small openings 2b (see Fig. 1 and FIG. 2).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The gear parts driving the grinder-plate unit are sealed to prevent the penetration of grinding dust. A first elastic current-conducting element (2) is positioned on a gear cover element (1). An elastic sealing element (4) is fixed on one side to a grinder-plate holder (13), and on the other side to the gear cover element so that openings (1a) in the gear cover element are exposed. The elastic current conducting element has an annular protuberance (2a) pointing towards the grinder plate.

Description

Die Erfindung betrifft einen Exzentertellerschleifer, bei dem die die Schleiftellereinheit antreibenden Getriebeteile gegen das Eindringen von Schleifstaub abgedichtet sind nach dem Oberbegriff des Anspruchs 1.The invention relates to an eccentric disc grinder, in which driving the sanding pad unit Gear parts against the ingress of grinding dust are sealed according to the preamble of claim 1.

Ein derartiger Exzentertellerschleifer geht beispielsweise aus der GB 1322283 A hervor.Such a Exzentertellerschleifer goes for example from GB 1322283 A.

Ein Exzentertellerschleifer geht ferner beispielsweise auch aus der DE 36 25 671 C1 hervor. Bei diesem Exzentertellerschleifer wird die Dichtung von einer gummielastischen, am Maschinengehäuse befestigten Faltenmembran gebildet, die über ein Lager drehbar auf der Antriebswelle oder dem Schleifteller der Schleiftellereinheit sitzt und das Maschinengehäuse oberhalb des Schleiftellers abschließt.An eccentric disc grinder also goes, for example also from DE 36 25 671 C1. In this Eccentric disc grinder becomes the seal of one rubber-elastic, attached to the machine housing Wrinkled membrane formed, which rotates about a bearing the drive shaft or the sanding pad of the Sanding pad unit sits and the machine housing concludes above the sanding plate.

Problematisch bei einem derartigen Exzentertellerschleifer ist es, dass keine Eigenabsaugung des Schleifstaubs möglich ist, da die Dichtung das Gehäuse oberhalb des Schleiftellers großflächig abschließt.Problematic with such Eccentric disc grinder is that no Self-extraction of the grinding dust is possible because the Seal the housing above the sanding plate completes a large area.

Aus der DE 4023464 A geht ein motorgetriebenes Handschleifgerät hervor, bei dem der anfallende Staub mittels einer Saugeinrichtung über Staubabsaugkanäle abgesaugt wird, die das Schleifelement durchqueren und in einen nach außen hin abgedichteten Staubabsaugraum oberhalb des Schleifelements münden.DE 4023464 A is a motor-driven Hand grinder protruding, where the accumulating dust by means of a suction device via Staubabsaugkanäle is sucked, which traverse the grinding element and in a sealed to the outside Staubabsaugraum open above the grinding element.

Der Erfindung liegt das Problem zugrunde, einen gattungsgemäßen Exzentertellerschleifer so weiterzubilden, dass einerseits eine optimale und leicht herstellbare Abdichtung der Getriebe- und Antriebsteile, andererseits eine Eigenabsaugung von Schleifstaub möglich ist.The invention is based on the problem, a generic Exzentertellerschleifer so to further develop, on the one hand, an optimal and easy to manufacture seal the gear and Drive parts, on the other hand, a self-extraction of Sanding dust is possible.

Dieses Problem wird bei einem Exzentertellerschleifer der eingangs beschriebenen Art durch die Merkmale des Anspruchs 1 gelöst.This problem is with an eccentric disc grinder of the type described above by the features of Claim 1 solved.

Das im Getriebedeckelelement angeordnete Luftleitelement ermöglicht durch optimale Luftleitung einen hohen Absaugwirkungsgrad. The arranged in the gear cover element Air guide made possible by optimal air line a high suction efficiency.

Durch die Möglichkeit, das Dichtelement lösbar an dem Getriebedeckelelement zu befestigen, wird nicht nur eine sehr schnelle Montage ermöglicht, sondern insbesondere auch eine sehr schnelle Demontage, beispielsweise um das Dichtelement bei einer Beschädigung auszutauschen.Due to the possibility, the sealing element releasably attached to the Fastening gear cover element is not only a very fast assembly allows, but especially a very quick dismantling, For example, the sealing element at a To replace damage.

Das Dichtelement ist als Dichtungsbalg ausgebildet, der an einem, an der Schleiftelleraufnahme vorgesehenen Stützring und an wenigstens einem Befestigungsdom lösbar befestigt ist, die an dem Getriebedeckelelement zum Schleifteller hin vorspringend angeordnet sind, wobei die Befestigung über einen Stützring und einen Gleitring, an dem das Dichtelement mittels einer Ringfeder erfolgt. Die Befestigung an dem Befestigungsdom geschieht durch einen Spanndraht. Hierdurch wird die Befestigung des Dichtungsbalgs wesentlich erleichtert und insbesondere auch eine Demontage bei beschädigtem Dichtungsbalg ermöglicht.The sealing element is designed as a sealing bellows, the at one, provided on the sanding plate holder Support ring and at least one attachment dome releasably secured to the transmission lid member are arranged projecting towards the sanding pad, the attachment via a support ring and a Sliding ring on which the sealing element by means of a Ring spring takes place. The attachment to the Fastening dome happens through a tension wire. As a result, the attachment of the sealing bellows much easier and especially one Dismantling with damaged sealing bellows allows.

Bei einer vorteilhaften Ausführungsform ist dabei vorgesehen, dass das Luftleitelement einen zum Schleifteller weisenden ringförmigen Vorsprung aufweist. In dem ringförmigen Vorsprung sind vorzugsweise über den Umfang gleichverteilt angeordnete Öffnungen vorgesehen, welche die Schleifstaubabsaugung optimieren.In an advantageous embodiment is thereby provided that the air guide element for Sanding plate facing annular projection having. In the annular projection are preferably arranged uniformly distributed over the circumference Openings provided which the Schleifstaubabsaugung optimize.

Neben einer optimalen Absaugwirkung erfüllt das Strömungsleitelement auch die Funktion einer Bremse des Schleiftellers, um so ein unerwünschtes Hochlaufen der Drehzahl des Schleiftellers zu verhindern.In addition to an optimal suction effect that fulfills Flow guiding also the function of a brake of the Sanding plate, so an undesirable run-up of the Speed of the grinding disc to prevent.

Weitere Vorteile und Merkmale der Erfindung sind Gegenstand der nachfolgenden Beschreibung sowie der zeichnerischen Darstellung eines Ausführungsbeispiels.Further advantages and features of the invention are Subject of the following description and the Diagram of an embodiment.

In Figur 1 ist schematisch der untere Teil eines Exzentertellerschleifers dargestellt, wobei zur besseren Übersicht der Schleifteller und das Gehäuse des Exzentertellerschleifers weggelassen wurden.In Figure 1 is schematically the lower part of a Exzentertellerschleifers shown, wherein the better overview of the sanding plates and the housing of the eccentric disc grinder have been omitted.

Fig. 2 zeigt eine teilweise geschnittene perspektivische Darstellung des Getriebedeckelelements mit darin befestigten Elementen des Exzentertellerantriebs.Fig. 2 shows a partially sectioned perspective view of the gear cover element with attached elements of the Exzentertellerantriebs.

In Fig. 3 ist schließlich eine Schnittdarstellung eines Exzentertellerantriebs eines von der Erfindung Gebrauch machenden Exzentertellerschleifers gezeigt.In Fig. 3 is finally a sectional view of a Exzentertellerantriebs one of the invention use revealing eccentric disc grinder.

Ein Gehäuse 30 eines Exzentertellerschleifers (vergl. Fig. 3) wird auf seiner dem Schleifteller 35 zugewandten Seite durch ein Getriebedeckelelement 1 abgeschlossen. An dem Getriebedeckelelement 1 ist ein elastisches Strömungsleitelement 2 beispielsweise durch Aufziehen angeordnet, welches einen zum Schleifteller 35 weisenden Vorsprung 2a aufweist. Dieses Strömungsleitelement 2 ermöglicht zum einen eine optimale Absaugung von beim Schleifvorgang entstehendem Schleifstaub, zum anderen dient es als Bremselement zur Abbremsung des Schleiftellers 35 im weiter unten näher zu beschreibenden Friktionsmitnahmebetrieb.A housing 30 of an eccentric disc grinder (see FIG. Fig. 3) is on its the grinding plate 35th facing side by a gear cover element. 1 completed. On the gear cover element 1 is a elastic flow guide 2, for example, by Arranged arranged, which one to the sanding plate 35 facing projection 2a has. This Flow guide 2 allows for a optimal extraction of the grinding process Grinding dust, on the other hand it serves as a braking element for Deceleration of the grinding plate 35 in detail below to be described Friktionsmitnahmebetrieb.

Zentrisch in dem Getriebedeckelelementelement 1 ist ferner eine als Ganze mit 13 bezeichnete Schleiftelleraufnahme angeordnet (vergl. auch Fig. 1 und Fig. 2). Diese Schleiftelleraufnahme 13 weist ein Aussenstirnzahnrad 13a auf, welches auf an sich bekannte Weise in einem Innenstirnzahnrad 33, welches in dem Gehäuse 30 des Exzentertellerschleifers drehfest, aber axial verschieblich angeordnet ist, abwälzt. An der Schleiftelleraufnahme 13 sind ein Drehlager, beispielsweise ein Rillenkugellager 6 mittels eines Sicherungsrings 8, sowie eine Nadelhülse 7 befestigt. Das Rillenkugellager 6 und die Nadelhülse 7 dienen der drehbeweglichen Aufnahme des Schleiftellers 35.Centric in the gear cover element element 1 is also designated as a whole with 13 Grinding plate receiving arranged (see also FIG. 1 and Fig. 2). This sanding pad receptacle 13 has a Outboard spur gear 13a on which in itself known manner in a Innenstirnzahnrad 33, which in the housing 30 of the eccentric disc grinder rotatably but axially displaceable, rolls. At the sanding pad holder 13 are a Rotary bearing, for example, a deep groove ball bearing 6th by means of a securing ring 8, as well as a needle sleeve 7 attached. The deep groove ball bearing 6 and the needle sleeve 7 serve the rotatable recording of Sanding plate 35.

An der Schleiftellerlaufnahme 13 sind ferner ein Gleitring 5 und ein Stützring 3 befestigt, wobei der Stützring 3 beispielsweise aus einer Aluminiumlegierung besteht, wohingegen der Gleitring ein Stahlteil ist. Der Gleitring 5 und der Stützring 3 sind auf eine an der Schleiftelleraufnahme 13 vorgesehenen Aufnahme aufgepresst.At the sanding plate run 13 are also a Slip ring 5 and a support ring 3 is fixed, wherein the Support ring 3, for example, an aluminum alloy whereas the slide ring is a steel part. The slide ring 5 and the support ring 3 are on one the sanding plate holder 13 provided recording pressed.

An dem Stützring 3 ist beispielsweise mittels einer Ringfeder 12 ein zweites Dichtelement 4 befestigt, beispielsweise durch am Dichtelement 4 vorgesehene Lippen 4a, welche auf den Gleitring 5 angepasst sind. Das zweite Dichtelement 4 ist andererseits an einem Befestigungsdom 16, der an dem Getriebedeckel 1 zum Schleifteller hin vorspringend angeordnet ist, beispielsweise mittels eines Spanndrahts 9 lösbar befestigt.
Das Getriebedeckelelement 1 ist durch ein Dichtelement 1c mit dem Gehäuse 30 abgedichtet verbunden.On the support ring 3, for example, by means of an annular spring 12, a second sealing element 4 is fixed, for example by provided on the sealing element 4 lips 4a, which are adapted to the slide ring 5. On the other hand, the second sealing element 4 is detachably fastened, for example by means of a tension wire 9, to a fastening dome 16, which is arranged projecting on the gear cover 1 toward the sanding pad.
The gear cover element 1 is sealed to the housing 30 by a sealing element 1c.

Das im Gehäuse 30 drehfest gelagerte Innenstirnzahnrad 33 ist so auf das Aussenstirnzahnrad 13a, welches mit dem Schleifteller 35 verbunden ist, angepasst, dass es in dem Innenstirnzahnrad 33 abwälzen kann.The rotatably mounted in the housing 30 inner spur gear 33 is on the outer spur gear 13a, which with the sanding pad 35 is connected, adapted that it can roll in the internal spur gear 33.

Der Schleifteller 35 bildet zusammen mit der Schleiftelleraufnahme 13 und dem Aussenstirnzahnrad 13a eine Baugruppe, die beispielsweise mittels einer Mutter 31 an dem Getriebedeckelelement 1 befestigt ist, wie es aus Fig. 3 hervorgeht. Das Aussenstirnzahnrad 13a ist auf einer exzentrischen Welle 40 angeordnet, die von einem (nicht dargestellten) Elektromotor auf an sich bekannte Weise angetrieben wird.The sanding pad 35 forms together with the Sanding plate holder 13 and the outer end gear 13a an assembly, for example by means of a nut 31 is attached to the transmission lid member 1 as it is From Fig. 3 shows. The outer spur gear 13a is arranged on an eccentric shaft 40, of an electric motor (not shown) on known manner is driven.

Das Innenstirnzahnrad 33 ist durch ein Schaltgestänge 51, welches durch einen Schaltknopf 50 betätigbar ist, in Axialrichtung entgegen der Rückstellkraft von Synchronisationsdruckfedern 34 verschieblich. Die Verstellung entspricht der aus der DE 197 27 700 A1 bekannten, auf die vorliegend Bezug genommen wird. Die Synchronisationsdruckfedern 34 ermöglichen nicht nur eine Stabilisierung des Innenstirnzahnrads 33 in einer vorgegebenen Position, sondern auch ein synchronisiertes Einrücken des Aussenstirnzahnrads 13a in das Innenstirnzahnrad 33. Durch die Synchronisationsdruckfedern 34 können auch geringfügige Lageungenauigkeiten des Aussenstirnzahnrads 13a und des Innenstirnzahnrads 33 kompensiert werden.The internal spur gear 33 is connected by a shift linkage 51, which is actuatable by a switch button 50, in the axial direction against the restoring force of Synchronization springs 34 displaced. The Adjustment corresponds to that of DE 197 27 700 A1 to which reference is made in the present case. The Synchronization compression springs 34 not only allow a stabilization of the internal spur gear 33 in one predetermined position, but also one synchronized engagement of the outer spur gear 13a in the internal spur gear 33. Through the Synchronization springs 34 may also be minor Position inaccuracies of the outer spur gear 13a and the Inner spur gear 33 can be compensated.

Der Exzentertellerschleifer hat im wesentlichen zwei Schaltstellungen.The Exzentertellerschleifer has essentially two Switching positions.

In einer ersten, durch Betätigen des Schaltknopfes wählbaren Schaltstellung ist das Aussenstirnzahnrad 13a in Eingriff mit dem Innenstirnzahnrad 33 (in Fig. 3 dargestellt). In dieser Schaltstellung rotiert die gesamte Baugruppe umfassend Schleiftelleraufnahme 13, Schleifteller 35 und Aussenstirnzahnrad 13a um die Exzenterwelle 40. Gleichzeitig wälzt das Aussenstirnzahnrad 13a in dem Innenstirnzahnrad 33 ab, wodurch eine kreisende Bewegung hervorgerufen wird. Dieser kreisenden Bewegung ist die Drehung des Schleiftellers 35 um seine eigene Achse überlagert, so dass sich insgesamt eine hypozykloidische Bewegung ergibt, welche beispielsweise ein Abtragsgschleifen ermöglicht.In a first, by pressing the button selectable shift position is the outer spur gear 13a in engagement with the internal spur gear 33 (in FIG. 3) ) Shown. In this switching position rotates the entire assembly comprising sanding disk holder 13, Sanding pad 35 and outer spur gear 13 a to the Eccentric shaft 40. At the same time that rolls Outer spur gear 13a in the internal spur gear 33, causing a circular motion. This circular movement is the rotation of the Grinding plate 35 superimposed on its own axis, so that in total a hypocycloidal movement resulting, for example, a Abtragsgschleifen allows.

In einer zweiten, durch Betätigen des Schaltknopfes einstellbaren Schaltstellung ist das Aussenstirnzahnrad 13a aus dem Innenstirnzahnrad 33 ausgerückt. In diesem Falle dreht sich der Schleifteller 35 lediglich aufgrund einer Friktionsmitnahme exzentrisch um die Exzenterwelle 40. Die vorbeschriebene hypozykloidische Bewegung entsteht jedoch nicht. Dieser Betriebszustand kann beispielsweise zum Feinschleifen eingesetzt werden. In diesem Betriebszustand wirkt das Luftleitelement 2 aufgrund seines zum Schleifteller hin weisenden ringförmigen Vorsprungs 2a als Bremselement, so dass ein "Hochlaufen" der Exzenterbewegung des Schleiftellers 35 nicht möglich ist.In a second, by pressing the switch button adjustable switch position is the outer spur gear 13a disengaged from the internal spur gear 33. In this Trap, the sanding pad 35 only rotates due to a friction bearing eccentric to the Eccentric shaft 40. The above-described hypocycloid However, movement does not arise. This operating condition can be used for fine grinding, for example become. This works in this operating state Air guide 2 due to his to the sanding pad pointing annular projection 2a as a braking element, so that a "run up" of the eccentric motion of the Sanding plate 35 is not possible.

In beiden Betriebszuständen dient das Luftleitelement 2 der optimalen Führung des Absaugluftstroms, mit dem Schleifstaub durch die in dem Getriebedeckelelement 1 vorgesehenen Öffnungen 1a abtransportiert wird. Zur Optimierung dieses Absaugluftstroms sind in dem ringförmigen Vorsprung 2a im wesentlichen über den Umfang gleichverteilte kleine Öffnungen 2b (vgl. Fig. 1 und Fig. 2) vorgesehen.In both operating states, the air guide element 2 is used the optimal guidance of the suction air flow, with the Grinding dust by the in the gear cover element. 1 provided openings 1a is removed. to Optimization of this exhaust air flow are in the annular projection 2a substantially over the Scope equally distributed small openings 2b (see Fig. 1 and FIG. 2).

Claims (3)

  1. An eccentric-disc grinder, in which the gearing parts driving the grinding-disc unit are sealed off to prevent the penetration of grinding dust, wherein a first resilient flow-guiding member (2) arranged on a gearing cover member (1) and a resilient sealing member (4) which is fastened on one side to a grinding-disc receiving means (13) and on the other side to the gearing-cover member (1) in such a way that openings (1a) in the gearing-cover member (1) are exposed, characterized in that the sealing member (4) is a sealing bellows which is fastened to a support ring (3) provided on the grinding-disc receiving means (13) and to at least one fastening dome (1b) which is arranged on the gearing-cover member (1) so as to project towards the grinding disc (35), and the sealing member (4) is fastened in a releasable manner to a sliding ring (5) by means of an annular spring (12) and to the at least one fastening dome (1b) by means of a tensioning wire (9).
  2. An eccentric-disc grinder according to Claim 1, characterized in that the resilient flow-guiding member (2) has an annular projection (2a) directed towards the grinding disc (35).
  3. An eccentric-disc grinder according to Claim 2, characterized in that openings (2b) preferably arranged uniformly distributed over the periphery of the flow-guiding member (2) are provided in the annular projection (2a).
EP01101595A 2000-03-03 2001-01-25 Orbital sander Expired - Lifetime EP1129822B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200130011T SI1129822T1 (en) 2000-03-03 2001-01-25 Orbital sander

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10010106A DE10010106A1 (en) 2000-03-03 2000-03-03 Eccentric disc grinder
DE10010106 2000-03-03

Publications (2)

Publication Number Publication Date
EP1129822A1 EP1129822A1 (en) 2001-09-05
EP1129822B1 true EP1129822B1 (en) 2003-05-02

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Family Applications (1)

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EP01101595A Expired - Lifetime EP1129822B1 (en) 2000-03-03 2001-01-25 Orbital sander

Country Status (5)

Country Link
EP (1) EP1129822B1 (en)
AT (1) ATE238885T1 (en)
DE (2) DE10010106A1 (en)
ES (1) ES2194797T3 (en)
SI (1) SI1129822T1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1842625A1 (en) 2006-04-07 2007-10-10 Metabowerke GmbH Portable electric grinding machine
US7837537B2 (en) 2005-03-24 2010-11-23 Black & Decker Inc. Belt sander
US7997962B2 (en) 2005-03-24 2011-08-16 Black & Decker Inc. Belt sander

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10347849B4 (en) 2003-10-10 2016-04-28 Robert Bosch Gmbh Exzenterschleifhandwerkzeugmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT943563B (en) * 1970-11-04 1973-04-10 Mafell Maschinenfabrik Mey R K SANDER IN PARTICULAR HONED RE WITH VIBRATING TOOL WITH VENTS AND VACUUM CLEANER
DE3625671C1 (en) * 1986-07-29 1988-01-07 Festo Kg Eccentric plate grinder
DE4023464A1 (en) * 1990-07-24 1992-01-30 Festo Kg Portable angle grinder with dust extraction system - has relief valves set to keep suction force on grinding wheel below that causing adherence to work
DE19727700C2 (en) * 1997-06-30 2000-04-20 Kress Elektrik Gmbh & Co Eccentric disc grinder
US5993305A (en) * 1998-10-31 1999-11-30 Chu; Eric Air-drafting dust remover for power sander

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7837537B2 (en) 2005-03-24 2010-11-23 Black & Decker Inc. Belt sander
US7846011B2 (en) 2005-03-24 2010-12-07 Black & Decker Inc. Belt sander
US7871311B2 (en) 2005-03-24 2011-01-18 Black & Decker Inc. Belt sander
US7997962B2 (en) 2005-03-24 2011-08-16 Black & Decker Inc. Belt sander
EP1842625A1 (en) 2006-04-07 2007-10-10 Metabowerke GmbH Portable electric grinding machine
DE102006016480A1 (en) * 2006-04-07 2007-10-11 Metabowerke Gmbh Electrical power grinder

Also Published As

Publication number Publication date
SI1129822T1 (en) 2003-10-31
ES2194797T3 (en) 2003-12-01
EP1129822A1 (en) 2001-09-05
ATE238885T1 (en) 2003-05-15
DE50100198D1 (en) 2003-06-05
DE10010106A1 (en) 2001-09-13

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