EP0237854B1 - Eccentric sander equipped with a device for modifying the sanding movement - Google Patents

Eccentric sander equipped with a device for modifying the sanding movement Download PDF

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Publication number
EP0237854B1
EP0237854B1 EP19870102850 EP87102850A EP0237854B1 EP 0237854 B1 EP0237854 B1 EP 0237854B1 EP 19870102850 EP19870102850 EP 19870102850 EP 87102850 A EP87102850 A EP 87102850A EP 0237854 B1 EP0237854 B1 EP 0237854B1
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EP
European Patent Office
Prior art keywords
friction
gear
housing
ring
eccentric
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
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EP19870102850
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German (de)
French (fr)
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EP0237854A3 (en
EP0237854A2 (en
Inventor
Günther Berger
Dieter Dörr
Günter Dipl.-Ing. Schaal (FH)
Fred Weinmann
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0237854A3 publication Critical patent/EP0237854A3/en
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    • 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

Definitions

  • the invention is based on an eccentric grinder according to the preamble of the main claim.
  • Such an eccentric grinder is available on the market and published in print in "Technical reports for metalworking" on 3.4. 1983 under the title “Rotex, the new dimension of grinding”.
  • the jump between real rough grinding and fine grinding is too big.
  • it is obvious to provide a further gear stage with changed diameters of the friction or gear wheels but this is only conceivable in the known manner with a considerable enlargement of the gear part of the eccentric grinder.
  • switching from one type of drive to another involves a relatively large amount of actuating means. These have to be robust for construction site operation and therefore of a correspondingly large size and still remain susceptible to faults. When using sprockets, their teeth can be damaged if they are handled carelessly when switching.
  • the eccentric grinder according to the invention with the characterizing features of the main claim has the advantage of optimal grinding performance with the simplest, space-saving construction.
  • the easily detachable connection of a friction or toothed ring serving the forced rolling movement of the grinding plate to the housing of the eccentric sander makes it possible to switch from a pure eccentric drive to driving the grinding plate with a forced rolling movement without additional adjusting means.
  • the friction or toothed ring When the friction or toothed ring is inserted, it comes into operative connection with the friction or toothed ring on the grinding plate and forces a rolling movement, which results in a cycloidal grinding pattern. If you remove the friction or toothed ring, you get a pure eccentric drive. To change over, only the grinding plate needs to be removed and the friction or toothed ring inserted or removed.
  • Control elements are superfluous. Because the housing-fixed receptacle can accommodate this friction or toothed ring at its two end edges, both the pure eccentric drive of the grinding plate without an inserted friction or toothing ring and the grinding plate drive with a forced rolling movement with two different grinding movements are possible because the friction or toothing ring by turning through 180 ° in two different positions. Advantageous further developments and improvements of the eccentric grinder specified in the main claim are possible through the measures listed in the subclaims.
  • FIG. 1 shows a section through an eccentric sander equipped according to the invention in the gear and grinding plate area, with an internal ring gear rolling on a housing-fixed external ring gear on the grinding plate
  • FIG. 2 a section as in FIG. 1, with an external ring gear rolling on a housing-fixed internal ring gear on the grinding plate.
  • an eccentric grinder 1 has a housing 2 which forms a bell 3.
  • a motor is housed, of which only the drive shaft 4 is shown.
  • This drive shaft 4 projects into the interior of the bell 3 and carries an intermediate piece 5.
  • the intermediate piece 5 is designed as a crank and has an eccentric to the drive shaft 4, cylindrical recess 6.
  • the eccentricity that is, the distance between the axis of the drive shaft 4 and The central axis of the recess 6 is denoted by x.
  • In the cylindrical recess 6 two ball bearings are inserted, which receive a support pin 8 for a grinding plate 9.
  • a pot-shaped rotating part 10, a spring washer 11 and a screw 13 screwed into a threaded bore 12 in the support pin 8 serve to fix the grinding plate 9 on the support pin 8.
  • a soft-elastic covering 14 is glued onto the outer end face of the grinding plate 9, which is to accommodate the actual one Sanding sheet 15 is used.
  • the grinding plate 9 On its inner end face, the grinding plate 9 has a double toothed ring 16, which is aligned concentrically with the longitudinal axis of the support pin 8 and thus eccentrically with the drive shaft 4.
  • the double ring gear 16 has an inner ring gear 17 and an outer ring gear 18.
  • a ring gear 19 is intended to cooperate with the double ring gear 16 and for this purpose with one Outer ring gear 20 and an inner ring gear 21 provided.
  • the receptacle 22 is an annular recess formed in a ring 23 fixed to the housing.
  • the receptacle 22 has an inner ring gear 24 and an outer ring gear 25 the corresponding ring gear 24 or 25 of the receptacle 22 is inserted.
  • an annular slot 28 is additionally introduced into the ring 23 fixed to the housing.
  • the housing-fixed ring 23 is preferably made of an elastic material with a relatively high coefficient of friction and is applied to tabs 29 which have been removed from the bell 3. The housing-fixed ring 23 can be pressed or glued into the bell 3.
  • the receptacle 22 for the toothed ring 19 becomes less sensitive to dust. The removal of the toothed ring 19 and the reinstallation is thereby facilitated. If the toothed ring 19 is removed from the receptacle 22, the drive of the grinding plate 9 does not necessarily take place for a specific grinding movement but only via the intermediate piece 5 with its eccentric recess 6. The mounting of the trunnion 8 in ball bearings 7 in this recess 6 shows that the grinding plate 9 is freely rotatable about the axis of the trunnion 8.
  • each abrasive grain of the abrasive sheet 15 fastened on the grinding plate 9 describes a pericycloid in which the rotational movement corresponds to the direction of rotation of the eccentric. This means that the path of the abrasive grains is the largest per revolution of the eccentric. This grinding movement causes the greatest stock removal and is therefore well suited for rough grinding, but not for grinding fine transitions.
  • connection piece 30 designates a connection piece with which suction paths (31) arranged inside the bell (3) can be connected to a dust extraction device.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Exzenterschleifer nach der Gattung des Hauptanspruchs. Ein solcher Exzenterschleifer ist auf dem Markt erhältlich und druckschriftlich veröffentlicht in "Fachberichte für Metallbearbeitung" am 3.4. 1983 unter dem Titel "Rotex, die neue Dimension des Schleifens". Trotz der hiermit gegebenen Vorteile ist eine optimale Anpassung eines solchen Exzenterschleifers an die Erfordernisse der Praxis noch nicht möglich. Einmal ist der Sprung zwischen echtem Grobschliff und Feinschliff zu groß. Zur Beseitigung dieses Mangels liegt zwar nahe, eine weitere Getriebestufe mit veränderten Durchmessern der Reib- oder Zahnräder vorzusehen, dies ist aber in der bekannten Weise nur mit einer erheblichen Vergrößerung des Getriebeteils des Exzenterschleifers denkbar. Zum anderen bringt das Schalten von einer Antriebsart zur anderen einen relativ großen Aufwand an Stellmitteln mit sich. Diese müssen für den Baustellenbetrieb robust und damit entsprechend groß ausgelegt werden und bleiben dennoch störanfällig. Bei der Verwendung von Zahnkränzen können deren Zähne bei unvorsichtigem Umgang beim Umschalten beschädigt werden.The invention is based on an eccentric grinder according to the preamble of the main claim. Such an eccentric grinder is available on the market and published in print in "Technical reports for metalworking" on 3.4. 1983 under the title "Rotex, the new dimension of grinding". Despite the advantages provided by this, an optimal adaptation of such an eccentric grinder to the requirements of practice is not yet possible. For one thing, the jump between real rough grinding and fine grinding is too big. To remedy this deficiency, it is obvious to provide a further gear stage with changed diameters of the friction or gear wheels, but this is only conceivable in the known manner with a considerable enlargement of the gear part of the eccentric grinder. On the other hand, switching from one type of drive to another involves a relatively large amount of actuating means. These have to be robust for construction site operation and therefore of a correspondingly large size and still remain susceptible to faults. When using sprockets, their teeth can be damaged if they are handled carelessly when switching.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße Exzenterschleifer mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil optimaler Schleifleistung bei einfachstem, raumsparendem Aufbau. Durch die leicht lösbare Verbindung eines der erzwungenen Abrollbewegung des Schleiftellers dienenden Reib- oder Zahnringes mit dem Gehäuse des Exzenterschleifers ist ohne zusätzliche Stellmittel ein Umstellen von reinem Exzenterantrieb auf Antrieb des Schleiftellers mit einer erzwungenen Abrollbewegung möglich. Bei eingesetztem Reib- oder Zahnring kommt dieser mit dem Reib- oder Zahnring am Schleifteller in Wirkverbindung und erzwingt eine Abrollbewegung aus der sich ein zykloidisches Schleifbild ergibt. Entfernt man den Reib- oder Zahnring, so ergibt sich ein reiner Exzenterantrieb. Zum Umstellen braucht lediglich der Schleifteller abgenommen und der Reib- oder Zahnring eingesetzt oder entfernt zu werden. Stellelemente sind überflüssig. Dadurch daß die gehäusefeste Aufnahme diesen Reib- oder Zahnring an seinen beiden Stirnrändern aufnehmen kann, sind sowohl der reine Exzenterantrieb des Schleiftellers ohne eingesetzten Reib- oder Zahnring als auch der Schleiftellerantrieb mit erzwungener Abrollbewegung mit zwei verschiedenen Schleifbewegungen möglich, weil man den Reib- oder Zahnring durch Wenden um 180° in zwei verschiedenen Stellungen einsetzen kann. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Exzenterschleifers möglich.The eccentric grinder according to the invention with the characterizing features of the main claim has the advantage of optimal grinding performance with the simplest, space-saving construction. The easily detachable connection of a friction or toothed ring serving the forced rolling movement of the grinding plate to the housing of the eccentric sander makes it possible to switch from a pure eccentric drive to driving the grinding plate with a forced rolling movement without additional adjusting means. When the friction or toothed ring is inserted, it comes into operative connection with the friction or toothed ring on the grinding plate and forces a rolling movement, which results in a cycloidal grinding pattern. If you remove the friction or toothed ring, you get a pure eccentric drive. To change over, only the grinding plate needs to be removed and the friction or toothed ring inserted or removed. Control elements are superfluous. Because the housing-fixed receptacle can accommodate this friction or toothed ring at its two end edges, both the pure eccentric drive of the grinding plate without an inserted friction or toothing ring and the grinding plate drive with a forced rolling movement with two different grinding movements are possible because the friction or toothing ring by turning through 180 ° in two different positions. Advantageous further developments and improvements of the eccentric grinder specified in the main claim are possible through the measures listed in the subclaims.

Zeichnungdrawing

Ein Ausführungsbeispiel des Erfindungsgegenstandes ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Schnitt durch einen erfindungsgemäß ausgestatteten Exzenterschleifer im Getriebe- und Schleiftellerbereich, mit auf einem gehäusefesten Außenzahnkranz abrollendem Innenzahnkranz am Schleifteller und Figur 2 einen Schnitt wie Figur 1, mit auf einem gehäusefesten Innenzahnkranz abrollendem Außenzahnkranz am Schleifteller.An embodiment of the subject of the invention is shown in the drawing and explained in more detail in the following description. 1 shows a section through an eccentric sander equipped according to the invention in the gear and grinding plate area, with an internal ring gear rolling on a housing-fixed external ring gear on the grinding plate, and FIG. 2 a section as in FIG. 1, with an external ring gear rolling on a housing-fixed internal ring gear on the grinding plate.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Im Ausführungsbeispiel hat ein Exzenterschleifer 1 ein Gehäuse 2, das eine Glocke 3 bildet. Im Gehäuse 2 ist ein Motor untergebracht, von dem lediglich die Antriebswelle 4 gezeigt ist. Diese Antriebswelle 4 ragt im das Innere der Glocke 3 und trägt ein Zwischenstück 5. Das Zwischenstück 5 ist als Kurbel ausgebildet und hat eine exzentrisch zur Antriebswelle 4 gelegene, zylindrische Ausnehmung 6. Die Exzentrizität, d.h., der Abstand zwischen der Achse der Antriebswelle 4 und der mittenachse der Ausnehmung 6 ist mit x bezeichnet. In die zylindrische Ausnehmung 6 sind zwei Kugellager eingesetzt, die einen Tragzapfen 8 für einen Schleifteller 9 aufnehmen. Ein topfförmiges Drehteil 10, eine Federscheibe 11 und eine in eine Gewindebohrung 12 im Tragzapfen 8 eingeschraubte Schraube 13 dienen dem Festlegen des Schleiftellers 9 auf dem Tragzapfen 8. Auf die äußere Stirnfläche des Schleiftellers 9 ist ein weichelastischer Belag 14 aufgeklebt, der der Aufnahme des eigentlichen Schleifblattes 15 dient. An seiner inneren Stirnfläche trägt der Schleifteller 9 einen Doppelzahnkranz 16, der konzentrisch zur Längsachse des Tragzapfens 8 und damit exzentrisch zur Antriebswelle 4 ausgerichtet ist. Der Doppelzahnkranz 16 hat einen Innenzahnkranz 17 und einen Außenzahnkranz 18. Ein Zahnring 19 ist zum Zusammenwirken mit dem Doppelzahnkranz 16 bestimmt und hierzu mit einem Außenzahnkranz 20 und einem Innenzahnkranz 21 versehen. Er ist mittels einer gehäusefesten Aufnahme 22 leicht lösbar mit dem Gehäuse 2 verbindbar. Die Aufnahme 22 ist eine in einen gehäusefesten Ring 23 eingeformte ringförmige Ausnehmung. Die Aufnahme 22 besitzt einen Innenzahnkranz 24 und einen Außenzahnkranz 25. Sie passen zum Außenzahnkranz 20 bzw. zum Innenzahnkranz 21 des Zahnrings 19. Federnde Ränder 26 und 27 sind zur Rasthalterung des Zahnrings 19 bestimmt, wenn dieser mit einem seiner Zahnkränze 20 bzw. 21 in den entsprechenden Zahnkranz 24 bzw. 25 der Aufnahme 22 eingesetzt ist. Um die Aufnahme 22 noch besser auffedernd zu gestalten, ist in den gehäusefesten Ring 23 zusätzlich ein ringförmiger Schlitz 28 eingebracht. Der gehäusefeste Ring 23 besteht vorzugsweise aus einem elatischen Material mit einem relativ hohen Reibwert und ist an Lappen 29 angelegt, die aus der Glocke 3 ausgeschert sind. Dabei kann der gehäusefeste Ring 23 in die Glocke 3 eingepreßt oder eingeklebt sein. Wenn die Zahnkränze 24 und 25 mit Zahnlücken versehen sind, beispielsweise jeweils nur jeder zweite Zahn ausgebildet ist, wird die Aufnahme 22 für den Zahnring 19 unempfindlicher gegen Staub. Das Entfernen des Zahnringes 19 und das Wiedereinsetzen wird hierdurch erleichtert. Wenn der Zahnring 19 aus der Aufnahme 22 entfernt ist, erfolgt der Antrieb des Schleiftellers 9 nicht zwangsläufig für eine bestimmte Schleifbewegung sondern allein über das Zwischenstück 5 mit seiner exzentrischen Ausnehmung 6. Die Lagerung des Tragzapfens 8 in Kugellagern 7 in dieser Ausnehmung 6 zeigt, daß der Schleifteller 9 um die Achse des Tragzapfens 8 frei drehbar ist. Er führt deshalb beim Schleifen eine Bewegung aus, die einer Zykloide mit überlagerter Drehbewegung folgt, wobei die Überlagerung der Drehbewegung abhängig ist vom Andruck beim Schleifen. Der Weg jedes einzelnen Schleifkorns pro Exzenterumdrehung ist sehr klein, woraus sich ein sehr feines Schliffbild ergibt. Entsprechend gering ist der Abtrag. Diese Schleifbewegung ist besonders gut geeignet zum Schleifen allmählicher Übergänge. Setzt man den Zahnring 19 in der in Figur 1 dargestellten Weise in die Aufnahme 22 ein und den Schleifteller 9 entsprechend wieder auf, so bringt man dabei den Außenzahnkranz 20 des Zahnringes 19 in Eingriff mit dem Innenzahnkranz 17 des Doppelzahnkranzes 16. Da beim Schleifen der Zahnring 19 feststeht, rollt der Innenzahnkranz 17 auf dem Außenzahnkranz 20 ab. Jedes Schleifkorn des auf dem Schleifteller 9 befestigten Schleifblattes 15 beschreibt beim Schleifen mit dieser Einstellung eine Perizykloide, bei der die Drehbewegung mit der Drehrichtung des Exzenters übereinstimmt. Dadurch ist der Weg der Schleifkörner pro Umdrehung des Exzenters am größten. Diese Schleifbewegung bewirkt den größten Abtrag und eignet sich deshalb gut zum Grobschleifen, aber nicht zum Schleifen feiner Übergänge. Entnimmt man der Aufnahme 22 nach Abnehmen des Schleiftellers 9 den Zahnring 19, wendet diesen um 180° und setzt ihn wieder ein in die Aufnahme 22, so kommt nach Aufsetzen des Schleiftellers 9 der Außenzahnkranz 18 des Doppelzahnkranzes 16 in Eingriff mit dem Innenzahnkranz 21. Da beim Schleifen der Innenzahnkranz 21 feststeht, rollt der Außenzahnkranz 18 auf ihm ab und bestimmt so die Schleifbewegung des Schleiftellers 9. Jedes Schleifkorn auf dem Schleifblatt 15 beschreibt eine verlängerte Hypozkloide, wobei es sich gegen die Drehrichtung des Exzenters bewegt. Dies ergibt einen größeren Abtrag als beim zuerst beschriebenen Schleifen ohne erzwungene Abrollbewegung aber einen geringeren Abtrag als bei der vorstehend beschriebenen Schleifbewegung. Entsprechend feiner ist auch das Schliffbild. Mit dieser Einstellung können Übergänge noch gut geschliffen werden. Für einen Feinschliff ist es aber zweckmäßig, die Getriebeverbindung zwischen dem Doppelzahnkranz 16 und dem Zahnring 19 durch Entnehmen des Zahnringes 19 zu lösen.In the exemplary embodiment, an eccentric grinder 1 has a housing 2 which forms a bell 3. In the housing 2, a motor is housed, of which only the drive shaft 4 is shown. This drive shaft 4 projects into the interior of the bell 3 and carries an intermediate piece 5. The intermediate piece 5 is designed as a crank and has an eccentric to the drive shaft 4, cylindrical recess 6. The eccentricity, that is, the distance between the axis of the drive shaft 4 and The central axis of the recess 6 is denoted by x. In the cylindrical recess 6 two ball bearings are inserted, which receive a support pin 8 for a grinding plate 9. A pot-shaped rotating part 10, a spring washer 11 and a screw 13 screwed into a threaded bore 12 in the support pin 8 serve to fix the grinding plate 9 on the support pin 8. A soft-elastic covering 14 is glued onto the outer end face of the grinding plate 9, which is to accommodate the actual one Sanding sheet 15 is used. On its inner end face, the grinding plate 9 has a double toothed ring 16, which is aligned concentrically with the longitudinal axis of the support pin 8 and thus eccentrically with the drive shaft 4. The double ring gear 16 has an inner ring gear 17 and an outer ring gear 18. A ring gear 19 is intended to cooperate with the double ring gear 16 and for this purpose with one Outer ring gear 20 and an inner ring gear 21 provided. It can be easily detachably connected to the housing 2 by means of a receptacle 22 fixed to the housing. The receptacle 22 is an annular recess formed in a ring 23 fixed to the housing. The receptacle 22 has an inner ring gear 24 and an outer ring gear 25 the corresponding ring gear 24 or 25 of the receptacle 22 is inserted. In order to make the receptacle 22 even more resilient, an annular slot 28 is additionally introduced into the ring 23 fixed to the housing. The housing-fixed ring 23 is preferably made of an elastic material with a relatively high coefficient of friction and is applied to tabs 29 which have been removed from the bell 3. The housing-fixed ring 23 can be pressed or glued into the bell 3. If the toothed rings 24 and 25 are provided with tooth gaps, for example only every second tooth is formed, the receptacle 22 for the toothed ring 19 becomes less sensitive to dust. The removal of the toothed ring 19 and the reinstallation is thereby facilitated. If the toothed ring 19 is removed from the receptacle 22, the drive of the grinding plate 9 does not necessarily take place for a specific grinding movement but only via the intermediate piece 5 with its eccentric recess 6. The mounting of the trunnion 8 in ball bearings 7 in this recess 6 shows that the grinding plate 9 is freely rotatable about the axis of the trunnion 8. It therefore executes a movement during grinding which follows a cycloid with a superimposed rotary movement, the superimposition of the rotary movement being dependent on the pressure during grinding. The path of every single abrasive grain per eccentric revolution is very small, which results in a very fine micrograph. The removal is correspondingly low. This grinding movement is particularly well suited for grinding gradual transitions. If the toothed ring 19 is inserted into the receptacle 22 in the manner shown in FIG. 1 and the grinding plate 9 is correspondingly replaced, the outer ring gear 20 of the toothed ring 19 is brought into engagement with the inner ring gear 17 of the double ring gear 16. Since the ring gear is ground 19 is fixed, the inner ring gear 17 rolls on the outer ring gear 20. When grinding with this setting, each abrasive grain of the abrasive sheet 15 fastened on the grinding plate 9 describes a pericycloid in which the rotational movement corresponds to the direction of rotation of the eccentric. This means that the path of the abrasive grains is the largest per revolution of the eccentric. This grinding movement causes the greatest stock removal and is therefore well suited for rough grinding, but not for grinding fine transitions. If you remove the toothed ring 19 from the receptacle 22 after removing the grinding plate 9, turns it by 180 ° and reinserts it into the receptacle 22, the outer toothed ring 18 of the double toothed ring 16 comes into engagement with the inner toothed ring 21 after the grinding plate 9 has been placed on it when grinding the inner ring gear 21 is fixed, the outer ring gear 18 rolls on it and thus determines the grinding movement of the grinding plate 9. Each abrasive grain on the grinding sheet 15 describes an elongated hypoccloid, wherein it moves against the direction of rotation of the eccentric. This results in a greater removal than in the case of the grinding described above without a forced rolling movement, but less removal than in the case of the grinding movement described above. The micrograph is correspondingly finer. With this setting, transitions can still be ground well. However, for fine-tuning, it is expedient to remove the gear ring between the double ring gear 16 and the toothed ring 19 19 to solve.

Mit 30 ist ein Anschlußstutzen bezeichnet, mit dem innerhalb der Glocke (3) angeordnete Absaugwege (31) an eine Staubabsaugvorrichtung angeschlossen werden können.30 designates a connection piece with which suction paths (31) arranged inside the bell (3) can be connected to a dust extraction device.

Claims (7)

1. Eccentric grinder (1) having a device for changing the grinding movement from straightforward eccentric driving of its grinding disc (9) to an eccentric movement with enforced rolling movement of the grinding disc (9), which can be achieved by rolling of a friction or gear rim (17 or 18) which is mounted eccentrically to the grinding disc (9) and rotatably on a drive shaft (4) on a friction or gear rim (20 or 21) which is attached concentrically with respect to this drive shaft to the housing, characterised in that the grinding disc (9) bears at least the friction or gear rim (17, 18) in a rotationally fixed manner, assigned to which is at least one further friction or gear rim (20, 21), which is borne by a friction or gear ring (19), which can be fully removed or, able to be turned through 180°, can be connected easily releasibly to the housing (2) by means of a mount (22) fixed to the housing, the friction or gear ring (19) having in each case in the region of both its face edges a friction or gear rim (20 and 21, respectively), of which either the one rim (20) can be brought into engagement with a friction or gear rim (17) on the grinding disc (9) or the other rim (21) can be brought into engagement with a further friction or gear rim (18) on the grinding disc (9) by the friction or gear ring (19) being able to be fitted on the one hand with one of its face edges and on the other hand, after turning, with the other of its face edges into the mount (22) fixed to the housing.
2. Eccentric grinder according to Claim 1, characterised in that the mount (22) is an annular clearance in a ring (23) fixed to the housing, having an internal friction or gear rim (24) and an external friction or gear rim (25), matching the internal friction or gear rim (21) and the external friction or gear rim (20) of the friction or gear ring (19).
3. Eccentric grinder according to Claim 2, characterised in that the mount (22) has resilient edges (26, 27).
4. Eccentric grinder according to Claim 2, characterised in that the mount (22) has friction-enhancingly covered bounding surfaces.
5. Eccentric grinder according to Claim 2, characterised in that the ring (23) fixed to the housing and having the clearance (22) is produced from a material having a high friction coefficient.
6. Eccentric grinder according to Claim 1, characterised in that the mount (22) is an annular clearance in a ring (23) fixed to the housing, which clearance has a wedge-shaped cross-section, the wedge angle being chosen such that self-locking occurs between the ring (22) fixed to the housing and the fitted, matchingly shaped friction or gear ring (19).
7. Eccentric grinder according to Claim 1, characterised in that the clearance (22) is widened in a segment-like manner or the gear rims (24, 25) are provided with tooth gaps in it.
EP19870102850 1986-03-20 1987-02-27 Eccentric sander equipped with a device for modifying the sanding movement Expired - Lifetime EP0237854B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3609441 1986-03-20
DE19863609441 DE3609441A1 (en) 1986-03-20 1986-03-20 Eccentric grinder with a device for changing the grinding movement

Publications (3)

Publication Number Publication Date
EP0237854A2 EP0237854A2 (en) 1987-09-23
EP0237854A3 EP0237854A3 (en) 1988-07-20
EP0237854B1 true EP0237854B1 (en) 1991-09-25

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EP19870102850 Expired - Lifetime EP0237854B1 (en) 1986-03-20 1987-02-27 Eccentric sander equipped with a device for modifying the sanding movement

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US (1) US4759152A (en)
EP (1) EP0237854B1 (en)
JP (1) JPS62228363A (en)
DE (2) DE3609441A1 (en)

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Also Published As

Publication number Publication date
EP0237854A3 (en) 1988-07-20
EP0237854A2 (en) 1987-09-23
US4759152A (en) 1988-07-26
DE3609441A1 (en) 1987-09-24
DE3773235D1 (en) 1991-10-31
JPS62228363A (en) 1987-10-07

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