EP0230621B1 - Orbital sander with a device for altering the sanding movement - Google Patents

Orbital sander with a device for altering the sanding movement Download PDF

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Publication number
EP0230621B1
EP0230621B1 EP19860117679 EP86117679A EP0230621B1 EP 0230621 B1 EP0230621 B1 EP 0230621B1 EP 19860117679 EP19860117679 EP 19860117679 EP 86117679 A EP86117679 A EP 86117679A EP 0230621 B1 EP0230621 B1 EP 0230621B1
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EP
European Patent Office
Prior art keywords
frictional
toothed
housing
grinding wheel
toothed rings
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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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EP19860117679
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German (de)
French (fr)
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EP0230621A2 (en
EP0230621A3 (en
Inventor
Manfred Ing. Stäbler
Walter Barth
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP0230621A3 publication Critical patent/EP0230621A3/en
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    • 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
    • B24B23/03Portable 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 sander according to the preamble of claim 1.
  • Such an eccentric sander is available on the market and published in print in "Technical reports for metalworking” on April 3, 1983 under the title “Rotex”
  • the new dimension of grinding means that an optimal adaptation of such an eccentric grinder to practical requirements is not yet possible.
  • the jump between real coarse grinding and fine grinding is too big.
  • a further gear stage with changed diameters of the friction or gear wheels is to remedy this defect to provide, but this is only conceivable in the known manner with a considerable enlargement of the gear part of the eccentric sander.
  • the eccentric sander according to the invention with the characterizing features of claim 1 has the advantage of optimal grinding performance with an extremely compact design and simple gear structure.
  • the friction or toothed rings can be arranged close to one another and can be made to roll alternately in a space-saving manner by friction or toothed rings engaging between them on the housing.
  • the third grinding movement which produces the finest grinding, can be easily achieved by an intermediate position in which the eccentric does not necessarily roll.
  • the grinding movement he creates follows a cycloid with a superimposed rotary movement that depends on the pressure.
  • the path of the individual abrasive grains per revolution of the eccentric is the smallest here.
  • the diameter of the external friction or toothed ring connected to the grinding plate is smaller than the diameter of the internal friction or toothed ring connected to the grinding plate, and that the difference in the effective diameters of these friction or toothed rings is the difference between the effective diameters of the Friction or sprockets on the housing plus four times the eccentricity of the eccentric corresponds. This results in a particularly space-saving possibility of arranging the contact points for the two positive gear connections offset by 180 ° from one another.
  • FIG. 1 shows a section through an eccentric grinder equipped according to the invention in the gearbox and grinding plate area
  • FIG. 2 shows a partial section II-II to FIG. 1
  • FIG. 3 shows a section through an eccentric grinder equipped according to another exemplary embodiment, like FIG. 1 and
  • FIG. 4 shows a partial section IV -IV to Figure 3.
  • 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 protrudes into the interior of the bell 3 and carries an intermediate piece 5.
  • the intermediate piece 5 is designed as a crank and has a cylindrical recess 6 located eccentrically to the drive shaft 4.
  • the eccentricity that is to say the distance between the axis of the drive shaft 4 and the center axis of the recess 6 is denoted by x.
  • two ball bearings 7 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 sprocket 16 has an inner sprocket 17 and an outer sprocket 18.
  • Both sprockets are axially offset from one another, so that a gap remains in the axial direction between them, into which a double sprocket 19 with an outer sprocket 20 and an inner sprocket 21 can engage.
  • This double ring gear 19 is formed as an end flange of a sleeve 22 concentrically providing the drive shaft 4.
  • This sleeve 22 is guided in a housing-fixed ring 23 which has two slots 24 and 25 running in the direction of a helical line. Pins 26 and 27 protrude into these slots. These pins 26 and 27 are fastened in bores in the sleeve 22 and each carry a slide ring 28. They are both secured with locking washers 29.
  • a knurled nut 31 is screwed on as a handle. 32 with a connection piece is designated, with the suction paths 33 arranged inside the bell 3 can be connected to a dust extraction device.
  • a double arrow 34 in FIG. 1 indicates the axial mobility of the sleeve 22 within the bell 3.
  • a double arrow 35 in FIG. 2 illustrates the actuating movement which can be carried out with the aid of the knurled nut 31 for changing over the grinding movements.
  • 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.
  • a double toothed ring 36 is used instead of the double toothed ring 16 and two separate toothed rings, an outer toothed ring 37 and an inner toothed ring 38 are used instead of the double toothed ring 19.
  • the double ring gear 36 has an inner ring gear 39 and an outer ring gear 40 in one plane.
  • a ring 41 which is inserted into the bell 3 and which directly supports this outer ring gear 37 serves as a guide for the outer ring gear 37.
  • An intermediate sleeve 42 is inserted between the outer ring gear 37 and the inner ring gear 38. This intermediate sleeve 42 thus serves as a guide for the inner ring gear 38.
  • Both the intermediate sleeve 42 and the bell 3 have slots 43 running in their circumferential direction.
  • the outer ring gear 37 and the inner ring gear 38 have two slots 44 and 45 provided with an opposite pitch.
  • a bolt 46 engages, the knurled nut 31 diametrically opposite, one of the slots 43 in the intermediate sleeve 42 and one of the slots 44 and 45 in the outer ring gear 37 and in the inner ring gear 38, respectively.
  • the bolt 46 is secured by axial lock washers 29.
  • a bolt 47 penetrates next to one of the slots 43 in the intermediate sleeve 42 and one of the slots 44 and 45 the slot in the bell 3, also designated 43.
  • the bolt 47 is provided with a screw thread at its outwardly projecting end. Like the bolt 27, it carries the knurled nut 31.
  • Embodiment according to Figures 1 and 2 described gear connection for rough grinding. If the bolt 47 is adjusted to a middle position, any transmission connection between one of the outer ring gears and one of the inner ring gears is omitted. The position for fine grinding results, as has also already been described for the exemplary embodiment according to FIGS. 1 and 2. If the operator adjusts to the other end position with the aid of the knurled nut 31, the inner ring gear 38 engages in the outer ring gear 40. The gear connection is thus established, with which an average grinding is achieved. It can be seen that the outer ring gear 37 and the inner ring gear 38 perform an opposite axial movement when adjusted by means of the knurled nut 31. The grinding results are the same as when using the eccentric grinder according to FIGS. 1 and 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Exzenterschleifer nach dem oberbegriff des Anspruchs 1. 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. Der Sprung zwischen echtem Grobschliff und Feinschliff ist zu groß. Nun liegt zwar nahe, zur Beseitigung dieses Mangels 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.The invention is based on an eccentric sander according to the preamble of claim 1. Such an eccentric sander is available on the market and published in print in "Technical reports for metalworking" on April 3, 1983 under the title "Rotex" The new dimension of grinding " The advantages given here mean that an optimal adaptation of such an eccentric grinder to practical requirements is not yet possible. The jump between real coarse grinding and fine grinding is too big. It is now obvious that a further gear stage with changed diameters of the friction or gear wheels is to remedy this defect to provide, but this is only conceivable in the known manner with a considerable enlargement of the gear part of the eccentric sander.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße Exzenterschleifer mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil optimaler Schleifleistung bei einer außerordentlich gedrängten Bauweise und einfachem Getriebeaufbau. Durch den Wechsel von einem Antrieb des Schleiftellers über einen auf diesem befestigten Außenreib- oder Zahnkranz zu einem Antrieb über einen auf dem Schleifteller befestigten Innenreib- oder Zahnkranz wird eine der Exzenterbewegung entgegengerichtete Schleifbewegung in eine mit der Exzenterbewegung gleich gerichtete Schleifbewegung verwandelt. Das heißt, daß der Weg der Schleifkörner pro Umdrehung des Exzenters nach diesem Wechsel am größten und damit der Materialabtrag am größten ist. Dabei brauchen die Dimensionen der beteiligten Reib- oder Zahnkränze nur geringfügig verändert zu werden. Die Reib- oder Zahnkränze können dicht beieinanderliegend angeordnet sein und sind auf raumsparende Weise durch zwischen sie eingreifende Reib- oder Zahnkränze am Gehäuse leicht wechselweise zum Abrollen zu bringen. Die dritte Schleifbewegung, die den feinsten Schliff erzeugt, ist einfach durch eine Zwischenstellung zu erreichen, in der der Exzenter nicht zwangsweise abrollt. Die von ihm erzeugte Schleifbewegung folgt einer Zykloide mit überlagerter, vom Andruck abhängiger Drehbewegung. Der Weg der einzelnen Schleifkörner pro Umdrehung des Exzenters ist hier am kleinsten.The eccentric sander according to the invention with the characterizing features of claim 1 has the advantage of optimal grinding performance with an extremely compact design and simple gear structure. By the change from a drive of the grinding plate via an external friction or toothed ring attached to it to a drive via an internal friction or toothed ring attached to the grinding plate, a grinding movement opposing the eccentric movement is converted into a grinding movement aligned with the eccentric movement. This means that the path of the abrasive grains per revolution of the eccentric is greatest after this change and thus the material removal is greatest. The dimensions of the friction or sprockets involved need only be changed slightly. The friction or toothed rings can be arranged close to one another and can be made to roll alternately in a space-saving manner by friction or toothed rings engaging between them on the housing. The third grinding movement, which produces the finest grinding, can be easily achieved by an intermediate position in which the eccentric does not necessarily roll. The grinding movement he creates follows a cycloid with a superimposed rotary movement that depends on the pressure. The path of the individual abrasive grains per revolution of the eccentric is the smallest here.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Exzenterschleifers möglich. Besonders vorteilhaft ist, daß der Durchmesser des mit dem Schleifteller verbundenen Außenreib- oder Zahnkranzes kleiner ist als der Durchmesser des mit dem Schleifteller verbundenen Innenreib- oder Zahnkranzes, und daß die Differenz der wirksamen Durchmesser dieser Reib- oder Zahnkränze der Differenz zwischen den wirksamen Durchmessern der Reib- oder Zahnkränze am Gehäuse zuzüglich der vierfachen Exzentrizität des Exzenters entspricht. Dadurch ergibt sich eine besonders raumsparende Möglichkeit, die Berührungsstellen für die beiden Zwangsgetriebeverbindungen um 180° gegeneinander versetzt anzuordnen.Advantageous further developments and improvements of the eccentric grinder specified in the main claim are possible through the measures listed in the subclaims. It is particularly advantageous that the diameter of the external friction or toothed ring connected to the grinding plate is smaller than the diameter of the internal friction or toothed ring connected to the grinding plate, and that the difference in the effective diameters of these friction or toothed rings is the difference between the effective diameters of the Friction or sprockets on the housing plus four times the eccentricity of the eccentric corresponds. This results in a particularly space-saving possibility of arranging the contact points for the two positive gear connections offset by 180 ° from one another.

Zeichnungdrawing

Zwei Ausführungsbeispiele des Erfindungsgegenstandes sind 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, Figur 2 einen Teilschnitt II-II zu Figur 1, Figur 3 einen Schnitt durch einen nach einem anderen Ausführungsbeispiel erfindungsgemäß ausgestatteten Exzenterschleifer wie Figur 1 und Figur 4 einen Teilschnitt IV-IV zu Figur 3.Two embodiments of the subject of the invention are shown in the drawing and explained in more detail in the following description. FIG. 1 shows a section through an eccentric grinder equipped according to the invention in the gearbox and grinding plate area, FIG. 2 shows a partial section II-II to FIG. 1, FIG. 3 shows a section through an eccentric grinder equipped according to another exemplary embodiment, like FIG. 1 and FIG. 4 shows a partial section IV -IV to Figure 3.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In einem Ausführungsbeispiel nach den Figuren 1 und 2 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 in 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, das heißt, 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 7 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. Beide Zahnkränze sind axial gegeneinander versetzt, so daß in Achsrichtung zwischen ihnen eine Lücke bleibt, in die ein Doppelzahnkranz 19 mit einem Außenzahnkranz 20 und einem Innenzahnkranz 21 eingreifen kann. Dieser Doppelzahnkranz 19 ist gebildet als Stirnflansch einer die Antriebswelle 4 konzentrisch ungebenden Hülse 22. Diese Hülse 22 ist geführt in einem gehäusefesten Ring 23, der zwei in Richtung einer Schraubenlinie verlaufende Schlitze 24 und 25 hat. In diese Schlitze ragen Bolzen 26 und 27. Diese Bolzen 26 und 27 sind in Bohrungen in der Hülse 22 befestigt und tragen je einen Gleitring 28. Sie sind beide gesichert mit Sicherungsscheiben 29. Während der Bolzen 26 im Schlitz 24 endet, durchgreift der Bolzen 27 den Schlitz 25 vollständig und ragt durch einen entsprechenden Schlitz 30 in der Glocke 3 nach außen. Sein äußeres Ende ist mit einem Gewinde versehen. Eine Rändelmutter 31 ist dort als Handhabe aufgeschraubt. Mit 32 ist ein Anschlußstutzen bezeichnet, mit dem innerhalb der Glocke 3 angeordnete Absaugwege 33 an eine Staubabsaugvorrichtung angeschlossen werden können. Ein Doppelpfeil 34 in Figur 1 gibt die Axialbeweglichkeit der Hülse 22 innerhalb der Glocke 3 an. Ein Doppelpfeil 35 in Figur 2 veranschaulicht die Stellbewegung, die mit Hilfe der Rändelmutter 31 zum Umstellen der Schleifbewegungen ausgeführt werden kann.In an exemplary embodiment according to FIGS. 1 and 2, 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 protrudes into the interior of the bell 3 and carries an intermediate piece 5. The intermediate piece 5 is designed as a crank and has a cylindrical recess 6 located eccentrically to the drive shaft 4. The eccentricity, that is to say the distance between the axis of the drive shaft 4 and the center axis of the recess 6 is denoted by x. In the cylindrical recess 6, two ball bearings 7 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 sprocket 16 has an inner sprocket 17 and an outer sprocket 18. Both sprockets are axially offset from one another, so that a gap remains in the axial direction between them, into which a double sprocket 19 with an outer sprocket 20 and an inner sprocket 21 can engage. This double ring gear 19 is formed as an end flange of a sleeve 22 concentrically providing the drive shaft 4. This sleeve 22 is guided in a housing-fixed ring 23 which has two slots 24 and 25 running in the direction of a helical line. Pins 26 and 27 protrude into these slots. These pins 26 and 27 are fastened in bores in the sleeve 22 and each carry a slide ring 28. They are both secured with locking washers 29. While the pin 26 ends in the slot 24, the pin 27 engages the slot 25 completely and protrudes through a corresponding slot 30 in the bell 3 to the outside. Its outer end is threaded. A knurled nut 31 is screwed on as a handle. 32 with a connection piece is designated, with the suction paths 33 arranged inside the bell 3 can be connected to a dust extraction device. A double arrow 34 in FIG. 1 indicates the axial mobility of the sleeve 22 within the bell 3. A double arrow 35 in FIG. 2 illustrates the actuating movement which can be carried out with the aid of the knurled nut 31 for changing over the grinding movements.

In der in Figur 1 gezeigten Stellung der Hülse 22 besteht keine Getriebeverbindung zwischen den Doppelzahnkränzen 16 und 19. Der Antrieb des Schleiftellers 9 erfolgt deshalb 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. Verstellt man die Hülse 22 mittels der Rändelmutter 31 gemäß der Darstellung in Figur 2 nach rechts oben in die dort gezeigte Endlage, so bringt man dabei den Außenzahnkranz 20 in Eingriff mit dem Innenzahnkranz 17. Da beim Schleifen die Hülse 22 mit ihrem Doppelzahnkranz 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. Verstellt man die Hülse 22 in ihre entgegengesetzte Endstellung, so kommt der Innenzahnkranz 21 des Doppelzahnkranzes 19 in Eingriff mit dem Außenzahnkranz 18 des Doppelzahnkranzes 16. 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 Hypozykloide, 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 zuvor beschriebenen Schleifbewegung. Entsprechend feiner ist auch das Schliffbild. Mit dieser Einstellung können Übergänge noch gut geschliffen werden. Für einen Feinschliff ist aber zweckmäßig, die Getriebeverbindung zwischen den Doppelzahnkränzen 16 und 19 zu lösen. Jede der drei möglichen Einstellungen der Hülse 22 kann dadurch gesichert werden, daß die Rändelmutter 31 gegen die ihr unmittelbar benachbarte Sicherungsscheibe 29 angezogen wird, die genügend Längsspiel auf dem Bolzen 27 hat, um ein Festklemmen an der Glocke 3 zu erlauben.In the position of the sleeve 22 shown in FIG. 1, there is no transmission connection between the double toothed rings 16 and 19. The grinding disc 9 is therefore not necessarily driven for a specific grinding movement, but solely via the intermediate piece 5 with its eccentric recess 6. The support pin 8 is supported in ball bearings 7 in this recess 6 shows that the grinding plate 9 is freely rotatable about the axis of the support pin 8. It therefore executes a movement when grinding, that of a cycloid follows with superimposed rotary motion, the superimposition of the rotary motion 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 grinding pattern. The removal is correspondingly low. This grinding movement is particularly well suited for grinding gradual transitions. If the sleeve 22 is adjusted by means of the knurled nut 31 as shown in FIG. 2 to the top right in the end position shown there, the outer ring gear 20 is brought into engagement with the inner ring gear 17. Since the sleeve 22 is fixed with its double ring gear 19 during grinding, 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 the sleeve 22 is moved into its opposite end position, the inner ring gear 21 of the double ring gear 19 comes into engagement with the outer ring gear 18 of the double ring gear 16. Since the inner ring gear 21 is fixed during grinding, the outer ring gear 18 rolls on it and thus determines the grinding movement of the grinding plate 9. Each abrasive grain on the abrasive sheet 15 describes an elongated hypocycloid, moving against the direction of rotation of the eccentric. This results in a greater removal than with the grinding described first without a forced rolling movement, but a lower removal than with 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 advisable to close the gear connection between the double sprockets 16 and 19 to solve. Each of the three possible settings of the sleeve 22 can be secured in that the knurled nut 31 is tightened against the locking washer 29 which is directly adjacent to it and which has enough longitudinal play on the bolt 27 to allow it to be clamped on the bell 3.

Im Ausführungsbeispiel nach den Figuren 3 und 4 sind anstelle des Doppelzahnkranzes 16 ein Doppelzahnkranz 36 und anstelle des Doppelzahnkranzes 19 zwei getrennte Zahnkränze, ein Außenzahnkranz 37 und ein Innenzahnkranz 38 verwendet. Der Doppelzahnkranz 36 besitzt in einer Ebene einen Innenzahnkranz 39 und einen Außenzahnkranz 40. Als Führung für den Außenzahnkranz 37 dient ein in die Glocke 3 eingesetzter Ring 41, der diesen Außenzahnkranz 37 direkt abstützt. Zwischen den Außenzahnkranz 37 und den Innenzahnkranz 38 ist eine Zwischenhülse 42 eingesetzt. Diese Zwischenhülse 42 dient damit als Führung für den Innenzahnkranz 38. Sowohl die Zwischenhülse 42 als auch die Glocke 3 besitzen in ihrer Umfangsrichtung verlaufende Schlitze 43. Der Außenzahnkranz 37 und der Innenzahnkranz 38 besitzen zwei mit entgegengesetzter Steigung versehene Schlitze 44 und 45. Ein Bolzen 46 durchgreift, der Rändelmutter 31 diametral gegenüberliegend, einen der Schlitze 43 in der Zwischenhülse 42 und je einen der Schlitze 44 und 45 im Außenzahnkranz 37 bzw. im Innenzahnkranz 38. Dabei ist der Bolzen 46 durch Sicherungsscheiben 29 gegen axiales Verschieben gesichert. Ein Bolzen 47 durchgreift neben einem der Schlitze 43 in der Zwischenhülse 42 und einem der Schlitze 44 und 45 den ebenfalls mit 43 bezeichneten Schlitz in der Glocke 3. Wie der Bolzen 27 ist der Bolzen 47 an seinem nach außen ragenden Ende mit einem Schraubengewinde versehen. Er trägt wie der Bolzen 27 die Rändelmutter 31.In the exemplary embodiment according to FIGS. 3 and 4, a double toothed ring 36 is used instead of the double toothed ring 16 and two separate toothed rings, an outer toothed ring 37 and an inner toothed ring 38 are used instead of the double toothed ring 19. The double ring gear 36 has an inner ring gear 39 and an outer ring gear 40 in one plane. A ring 41 which is inserted into the bell 3 and which directly supports this outer ring gear 37 serves as a guide for the outer ring gear 37. An intermediate sleeve 42 is inserted between the outer ring gear 37 and the inner ring gear 38. This intermediate sleeve 42 thus serves as a guide for the inner ring gear 38. Both the intermediate sleeve 42 and the bell 3 have slots 43 running in their circumferential direction. The outer ring gear 37 and the inner ring gear 38 have two slots 44 and 45 provided with an opposite pitch. A bolt 46 engages, the knurled nut 31 diametrically opposite, one of the slots 43 in the intermediate sleeve 42 and one of the slots 44 and 45 in the outer ring gear 37 and in the inner ring gear 38, respectively. The bolt 46 is secured by axial lock washers 29. A bolt 47 penetrates next to one of the slots 43 in the intermediate sleeve 42 and one of the slots 44 and 45 the slot in the bell 3, also designated 43. Like the bolt 27, the bolt 47 is provided with a screw thread at its outwardly projecting end. Like the bolt 27, it carries the knurled nut 31.

In der Darstellung gemäß Figur 3 greift der Außenzahnkranz 27 ein in den Innenzahnkranz 39. So ist die beim erstenIn the illustration according to FIG. 3, the outer ring gear 27 engages in the inner ring gear 39. This is the case with the first

Ausführungsbeispiel nach den Figuren 1 und 2 beschriebene Getriebeverbindung für Grobschliff hergestellt. Verstellt man den Bolzen 47 in eine mittlere Stellung, so unterbleibt jede Getriebeverbindung zwischen einem der Außenzahnkränze und einem der Innenzahnkränze. Es ergibt sich die Stellung für Feinschliff, wie sie ebenfalls bereits zum Ausführungsbeispiel nach den Figuren 1 und 2 beschrieben ist. Verstellt der Bedienende mit Hilfe der Rändelmutter 31 in die andere Endlage, so greift der Innenzahnkranz 38 ein in den Außenzahnkranz 40. Damit ist die Getriebeverbindung hergestellt, mit der ein mittlerer Schliff erzielt wird. Es zeigt sich, daß der Außenzahnkranz 37 und der Innenzahnkranz 38 beim Verstellen mittels der Rändelmutter 31 eine gegenläufige Axialbewegung ausführen. Die Schleifergebnisse gleichen denen bei Verwendung des Exzenterschleifers nach den Figuren 1 und 2.Embodiment according to Figures 1 and 2 described gear connection for rough grinding. If the bolt 47 is adjusted to a middle position, any transmission connection between one of the outer ring gears and one of the inner ring gears is omitted. The position for fine grinding results, as has also already been described for the exemplary embodiment according to FIGS. 1 and 2. If the operator adjusts to the other end position with the aid of the knurled nut 31, the inner ring gear 38 engages in the outer ring gear 40. The gear connection is thus established, with which an average grinding is achieved. It can be seen that the outer ring gear 37 and the inner ring gear 38 perform an opposite axial movement when adjusted by means of the knurled nut 31. The grinding results are the same as when using the eccentric grinder according to FIGS. 1 and 2.

Claims (8)

  1. Eccentric grinder with a device for varying the grinding movement by a change between a pure eccentric drive of its grinding wheel (9) and a drive for the grinding wheel with a forced rolling movement of a frictional or toothed ring, mounted with the grinding wheel eccentrically and rotatably on a drive shaft (4), on a frictional or toothed ring which is attached to the housing concentrically relative to this drive shaft, characterized in that the grinding wheel (9) carries both an internal frictional or toothed ring (17/39) and an external frictional or toothed ring (18/40), to which two frictional or toothed rings (20/21, 37/38) on the housing (2) are assigned, and in that the frictional or toothed rings (20/21, 37/38) on the housing (2) are axially adjustable for the purpose of a change between the gear connection of one (20/37) or the other (21/38) frictional or toothed ring with the corresponding frictional or toothed rings (17/39, 18/40) of the grinding wheel (9) or a separation of the two gear connections.
  2. Eccentric grinder according to Claim 1, characterized in that its housing (2) has a bell (3) which engages over the inner end face of a grinding wheel (9) together with the frictional or toothed rings (16, 36) attached there and which receives frictional or toothed rings (19, 37/38) attached to the housing (2) and with their adjusting means (26, 27, 31, 46, 47).
  3. Eccentric grinder according to Claim 1, characterized in that the diameter of the external frictional or toothed ring (18/40) connected to thgrinding wheel (9) is smaller than the diameter of the internal frictional or toothed ring (17/39) connected to the grinding wheel (9), and in that the difference between the effective diameters of these frictional or toothed rings corresponds to the difference between the effective diameters of the frictional or toothed rings (20/21, 37/38) on the housing (2), plus four times the eccentricity (x) of the eccentric (5/6).
  4. Eccentric grinder according to Claim 1, characterized in that the frictional or toothed rings (20/21) attached to the housing (2) are arranged in one plane on a common carrier (22), and the two frictional or toothed rings (17/18) fastened to the grinding wheel (9) are arranged offset axially relative to one another.
  5. Eccentric grinder according to Claim 4, characterized in that the axial distance between the frictional or toothed rings (17/18) on the grinding wheel (9) is greater than the width of the frictional or toothed rings (20/21) on the housing (2).
  6. Eccentric grinder according to Claim 4, characterized in that the carrier of the frictional or toothed rings (20/21) attached to the housing (2) is a sleeve (22) concentrically surrounding the drive shaft (4) and having an end flange (19) which projects beyond the sleeve outer surface outwards and inwards and of which the outer edge is equipped with an external toothing (20) and the inner edge with an internal toothing (21), in that this sleeve (22) is guided in a ring (23) fixed to the housing and having at least one slot (24, 25) which extends helically and into which a bolt (26, 27) fastened in a bore of the sleeve (22) engages, and in that at least one of these bolts (26, 27) passes outwards through the bell (3) and carries a handle (31).
  7. Eccentric grinder according to Claim 6, characterized in that the bolt (27) carries a clamping or catching device, preferably has a thread, and the handle (31) is a nut by the tightening of which the selector device can be fixed.
  8. Eccentric grinder according to one of Claims 1 to 3, characterized in that the two frictional or toothed rings (37/38) attached to the housing (2) are formed by oppositely adjustable carrier sleeves or form these themselves, the axial movement of the latter being obtainable by means of pin/slot guides (43-47) with oppositely inclined slots (44, 45) and with a guide slot (43) free of inclination, and in that the two frictional or toothed rings (39/40) fastened to the grinding wheel (9) are in one plane, preferably are made in one piece, their frictional or toothed faces confronting one another.
EP19860117679 1986-01-29 1986-12-18 Orbital sander with a device for altering the sanding movement Expired - Lifetime EP0230621B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3602571A DE3602571C2 (en) 1986-01-29 1986-01-29 Eccentric disc grinder with a device for changing the grinding movement
DE3602571 1986-01-29

Publications (3)

Publication Number Publication Date
EP0230621A2 EP0230621A2 (en) 1987-08-05
EP0230621A3 EP0230621A3 (en) 1988-07-13
EP0230621B1 true EP0230621B1 (en) 1991-03-06

Family

ID=6292833

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860117679 Expired - Lifetime EP0230621B1 (en) 1986-01-29 1986-12-18 Orbital sander with a device for altering the sanding movement

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US (1) US4727682A (en)
EP (1) EP0230621B1 (en)
JP (1) JPH0710490B2 (en)
DE (2) DE3602571C2 (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3625535C2 (en) * 1986-07-29 1994-05-11 Festo Kg Eccentric disc grinder
DE3642741A1 (en) * 1986-12-13 1988-06-23 Bosch Gmbh Robert Eccentric grinder
DE3809930A1 (en) * 1988-03-24 1989-10-05 Bosch Gmbh Robert Eccentric grinder
DE3942301C1 (en) * 1989-12-21 1991-02-14 Robert Bosch Gmbh, 7000 Stuttgart, De
GB9123502D0 (en) * 1991-11-06 1992-01-02 Black & Decker Inc Sanding apparatus
JP3063872B2 (en) * 1992-06-08 2000-07-12 株式会社マキタ Polishing machine
DE4233729A1 (en) * 1992-10-07 1994-04-14 Bosch Gmbh Robert Eccentric disc grinder with grinding disc brake
DE4233728A1 (en) * 1992-10-07 1994-04-14 Bosch Gmbh Robert Eccentric disc grinder
US5518442A (en) * 1993-01-22 1996-05-21 Porter-Cable Corporation Sander
US5392568A (en) * 1993-12-22 1995-02-28 Black & Decker Inc. Random orbit sander having braking member
US5580302A (en) * 1994-02-28 1996-12-03 Black & Decker Inc. Random orbit sander having air directing baffle
US5941765A (en) * 1996-11-19 1999-08-24 Porter Cable Corporation Sander
US6213851B1 (en) 1998-07-07 2001-04-10 Delta International Machinery Corp. Abrading apparatus
DE19963831B4 (en) * 1999-12-30 2006-04-06 Robert Bosch Gmbh Eccentric disc grinder with a housing
US8100745B2 (en) * 2007-03-16 2012-01-24 Black & Decker Inc. Low vibration sander with a flexible top handle
US20100009608A1 (en) * 2008-07-08 2010-01-14 Lo Ping-Hsiang Electric polishing gun
US10414014B2 (en) 2017-09-19 2019-09-17 Campbell Hausfeld, Llc Multifunction rotary tool including driveshaft
US10603760B2 (en) 2017-09-19 2020-03-31 Campbell Hausfeld, Llc Multifunction rotary tool including hub

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2794303A (en) * 1955-06-16 1957-06-04 David R Wickes Power-driven hand tool
US3482362A (en) * 1966-01-28 1969-12-09 Ingersoll Rand Co Double acting sander head
US3857206A (en) * 1973-03-08 1974-12-31 Nat Detroit Inc Co Compound motion rubbing machine
JPS5454035A (en) * 1977-10-06 1979-04-27 Canon Inc Image formation
JPS55150964A (en) * 1979-05-04 1980-11-25 Kinichi Takeuchi Grinding device capable of performing combined motion of rotation and circular motion
JPS5627773A (en) * 1979-08-09 1981-03-18 Uriyuu Seisaku Kk Oscillator device of orbital sanding machine
DE2938704C2 (en) * 1979-09-25 1984-03-15 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Eccentric disc sander
FR2529497A1 (en) * 1982-07-02 1984-01-06 Black & Decker Inc Base plate of orbital sander
CA1204067A (en) * 1983-04-29 1986-05-06 Miksa Marton Clutch assembly for sanding head
JPS60135171A (en) * 1983-12-23 1985-07-18 Konpakuto Tool Kk Polisher

Also Published As

Publication number Publication date
EP0230621A2 (en) 1987-08-05
US4727682A (en) 1988-03-01
EP0230621A3 (en) 1988-07-13
JPH0710490B2 (en) 1995-02-08
DE3602571C2 (en) 1998-09-24
DE3677948D1 (en) 1991-04-11
DE3602571A1 (en) 1987-07-30
JPS62181866A (en) 1987-08-10

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