EP1687120B1 - Grinding-disk receiving element especially for a hand-guided electric grinding tool - Google Patents

Grinding-disk receiving element especially for a hand-guided electric grinding tool Download PDF

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Publication number
EP1687120B1
EP1687120B1 EP04786842A EP04786842A EP1687120B1 EP 1687120 B1 EP1687120 B1 EP 1687120B1 EP 04786842 A EP04786842 A EP 04786842A EP 04786842 A EP04786842 A EP 04786842A EP 1687120 B1 EP1687120 B1 EP 1687120B1
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EP
European Patent Office
Prior art keywords
bearing flange
sanding plate
bearing
receptacle according
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.)
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Application number
EP04786842A
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German (de)
French (fr)
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EP1687120A1 (en
Inventor
Alfred Frech
Tobias Lutz
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1687120A1 publication Critical patent/EP1687120A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24DTOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08Circular back-plates for carrying flexible material
    • 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
    • B24B23/04Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
    • 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
    • B24B45/00Means for securing grinding wheels on rotary arbors

Definitions

  • the invention relates to a sanding disk holder for a hand-held electric grinding tool with the generic features of claim 1.
  • An inventive Schleiftelleraufname with the features of claim 1 has the advantage over that given by the arrangement of the driving pin and the screw holes on a common circle around the central axis of the bearing flange while equidistant arrangement of each adjacent driving pin or screw holes a simple assembly of a sanding pad is because there are a lot of ways to plug it up. At the same time, there may be no incorrect assembly during assembly of the sanding plate, since the driving pins always engage in any case in a through hole of the sanding plate.
  • the entire bearing flange can be produced in a single step. This is particularly advantageous in an embodiment of the bearing flange and the driving pins made of plastic, since only a single tool for the production of the entire bearing flange is needed.
  • the driving pins each have an insertion bevel at their free ends, a very simple and safe introduction of this driving pins in through holes in the sanding plate is possible, even if there is a slight rotation of the sanding pad against its end position on the bearing flange.
  • the through holes in the grinding disc can also have the same diameter. This achieves a larger number of possible attachment positions of the sanding disk on the bearing flange, which simplifies assembly.
  • a cover the bearing which is arranged in a recess of the bearing flange, sets in the axial direction, a very simple and inexpensive to be realized possibility of axial fixation of the bearing is achieved.
  • the bearing is protected against dust. It is particularly advantageous if the cover engages positively with an engagement member in the radial direction in the recess of the bearing flange. As a result, a very good axial fixation of the bearing is achieved on the bearing flange.
  • the cover has a collar which is positively engageable with a central hole of an insert plate of a sanding plate in the radial direction, the assembly of the sanding plate on the bearing flange is further simplified.
  • FIG. 1 shows a bearing 1 in the form of a ball bearing.
  • This bearing 1 serves to connect a drive axle a hand-held electric grinding tool with a sanding pad 5 (see Figures 5 to 7).
  • FIG. 2 shows a bearing flange 2 according to the invention.
  • surface 18 On its side facing the sanding pad 5 surface 18 four protruding in the axial direction driving pin 3 are formed.
  • the surface 18 also has four bolt holes 8.
  • the driving pins 3 and the screw holes 8 are arranged on a common circle around the central axis of the bearing flange 2. The distances between each adjacent driving pin 3 and screw holes 8 are the same size. In addition, the driving pins 3 and screw holes 8 are always arranged alternately on the circle. Thus, there is always a screw hole 8 between two driving pins 3 and vice versa.
  • the driving pins 3 are formed at their free end, each with an insertion bevel 16. As a result, the sanding pad 5 can be screwed onto the bearing flange 2 more easily (see FIGS. 6 and 7).
  • the bearing flange 2 is preferably made in one piece with the driving pins 3 in plastic. As a result, it has only a very low weight and is very simple and inexpensive to manufacture. For example, it can be produced by a single injection molding process using only a single injection molding tool.
  • FIG. 4 shows a cover 4 which has an engagement part 7 and a collar 9.
  • the cover 4 is preferably made of plastic, as it is very light and can be easily and inexpensively manufactured.
  • an electrical isolation of the armature shaft (not shown) of the eccentric grinder 15 with respect to the sanding pad 5 is thereby achieved. Further details of how the cover 4 cooperates with the bearing flange 2 and the sanding pad 5 are shown in FIGS. 6 and 7 and are explained below.
  • FIG. 5 shows a sanding pad 5 which is screwed onto the bearing flange 2 (see FIGS. 6 and 7).
  • the sanding pad 5 has an insert plate 10, which is preferably made of plastic.
  • the insert plate 10 has a central hole 13 and arranged on a circle around the central axis of the insert plate 10 suction holes 14th
  • a total of eight equidistantly arranged through holes 12 are formed on a further circle about the central axis of the insert plate 10.
  • the radius of this circle corresponds exactly to the radius of the circle on which the driving pins 3 and the screw holes 8 of the bearing flange 2 are arranged.
  • the through holes 12 of the sanding pad 5 can be brought into coincidence with the driving pin 3 and the bolt holes 8 of the bearing flange 2. More about this and for mounting the sanding pad 5 on the bearing flange 2 is below with reference to Figures 6 and 7 executed.
  • the insert plate 10 is foamed in a known manner with a foam 11. Since this is not essential to the invention, will not be discussed here in detail.
  • FIG. 6 shows a preassembled eccentric sander 15 in which a sanding disk holder according to the invention (see FIG. 3) is already mounted.
  • the cover plate 4 is inserted into the bearing flange 2 of the grinding disk holder according to the invention.
  • the engagement member 7 (see Figure 4) of the cover 4 engages here in the recess 17 (see Figure 2) of the bearing flange 2 and thereby fixes the bearing 1 in the axial direction with respect to the bearing flange 2.
  • the cover 4 thus acts not only as an electrical insulation against the armature shaft, but also protects the bearing 1 against dust entry, resulting in a longer life of the bearing 1.
  • the cover 4 When mounting the sanding pad 5 on the bearing flange 2, the cover 4 serves as a centering, since it can be seen well through the central hole 13 of the sanding pad 5.
  • the sanding pad 5 must be properly arranged only in its angular position, so that the driving pins 3 engage in the through holes 12 and it can be fixed by means of screws 6.
  • the screws 6 are preferably four plastic forming screws.
  • the correct placement with respect to the angle of the sanding pad 5 on the bearing flange 2 is further simplified by the above-described insertion bevels 16 of the driving pins 3.
  • the invention is by no means limited to a total of eight through-holes 12 in the sanding pad 5 and four driving pins 3 and four bolt holes 8.
  • a larger or smaller number of driving pins 3 and 8 screw holes can be selected. It is also possible to choose a different sequence of driving pins 3 and 8 screw holes.
  • Essential to the invention is merely that the driving pins 3 and the screw holes 8 are arranged on a common circle about the central axis of the bearing flange 2 and equidistant to each other. It does not matter whether a through hole 12 meets a driving pin 3 or a screw hole 8.
  • a very simple mounting of the sanding pad 5 on the position flange 2 is possible by a sanding pad according to the invention, at the same time a wrong assembly is avoided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Schleiftelleraufnahme für ein handgeführtes Elektroschleifwerkzeug mit den gattungsbildenden Merkmalen des Anspruchs 1.The invention relates to a sanding disk holder for a hand-held electric grinding tool with the generic features of claim 1.

Es sind Schleiftelleraufnahmen bekannt, bei denen in einen zweigeteilten Lagerflansch ein Kugellager eingesetzt wird, so dass dieses zwischen den beiden aus Aluminium bestehenden Teilen des Lagerflansches sowohl in axialer wie auch in radialer Richtung festgeklemmt wird. Dies geschieht mittels Schrauben, die durch einen Schleifteller mit Schraubenbohrungen in einem der beiden Teile des Lagerflansches in Eingriff stehen. Der zweite Teil des Lagerflansches wird zwischen den mit den Schraubenbohrungen versehenen Teil des Lagerflansches und dem Schleifteller eingeklemmt. Dabei laufen die Schrauben durch Führungsnuten an der Außenseite des zweiten Teils des Lagerflansches. Eine solche Konstruktion ist jedoch teuer herzustellen und schwierig zu montieren.There are sanding disc recordings are known in which a ball bearing is used in a two-part bearing flange, so that it is clamped between the two parts of the bearing flange made of aluminum both in the axial and in the radial direction. This is done by means of screws, which are engaged by a sanding plate with screw holes in one of the two parts of the bearing flange. The second part of the bearing flange is clamped between the provided with the screw holes part of the bearing flange and the sanding pad. The screws run through guide grooves on the outside of the second part of the bearing flange. However, such a construction is expensive to manufacture and difficult to assemble.

Des Weiteren ist es bekannt, auf der dem Schleifteller zugewandten Oberfläche des Lagerflansches Mitnahmezapfen anzuordnen, die auf einem Kreis um die Mittelachse des Lagerflansches über die Oberfläche herausstehen. Gleichzeitig sind in der Oberfläche eine Reihe von Schraubenbohrungen angeordnet, die auf einem anderen Kreis liegen. Durch eine Verschraubung des Schleiftellers mit dem Lagerflansch ist es jedoch durchaus möglich, dass die Mitnahmezapfen nicht in eine am Schleifteller ausgebildete Bohrung eintauchen und die Funktionalität des Schleifwerkzeugs somit nicht gegeben ist.Furthermore, it is known to arrange on the grinding plate facing surface of the bearing flange driving pins which protrude on a circle about the central axis of the bearing flange over the surface. At the same time a number of screw holes are arranged in the surface, which lie on a different circle. By a Screwing the sanding plate with the bearing flange, however, it is quite possible that the driving pins are not immersed in a bore formed on the sanding pad and thus the functionality of the grinding tool is not given.

Vorteile der ErfindungAdvantages of the invention

Eine erfindungsgemäße Schleiftelleraufname mit den Merkmalen des Anspruchs 1 hat dem gegenüber den Vorteil, dass durch die Anordnung der Mitnahmezapfen und der Schraubenbohrungen auf einem gemeinsamen Kreis um die Mittelachse des Lagerflansches bei gleichzeitiger äquidistanter Anordnung von jeweils benachbarten Mitnahmezapfen bzw. Schraubenbohrungen eine einfache Montage eines Schleiftellers gegeben ist, da es für diesen eine Vielzahl von Möglichkeiten des Aufsteckens gibt. Gleichzeitig kann es bei der Montage des Schleiftellers zu keiner Fehlmontage kommen, da die Mitnehmerzapfen auf alle Fälle immer in eine Durchgangsbohrung der Schleifplatte eingreifen.An inventive Schleiftelleraufname with the features of claim 1 has the advantage over that given by the arrangement of the driving pin and the screw holes on a common circle around the central axis of the bearing flange while equidistant arrangement of each adjacent driving pin or screw holes a simple assembly of a sanding pad is because there are a lot of ways to plug it up. At the same time, there may be no incorrect assembly during assembly of the sanding plate, since the driving pins always engage in any case in a through hole of the sanding plate.

Dadurch, dass die Mitnahmezapfen einstückig mit dem Lagerflansch ausgebildet sind, kann der gesamte Lagerflansch in einem einzigen Arbeitsschritt hergestellt werden. Dies ist insbesondere bei einer Ausführung des Lagerflansches und der Mitnahmezapfen aus Kunststoff vorteilhaft, da nur ein einziges Werkzeug für die Herstellung des gesamten Lagerflansches benötigt wird.Characterized in that the driving pins are integrally formed with the bearing flange, the entire bearing flange can be produced in a single step. This is particularly advantageous in an embodiment of the bearing flange and the driving pins made of plastic, since only a single tool for the production of the entire bearing flange is needed.

Dadurch, dass die Mitnahmezapfen an ihren freien Enden jeweils eine Einführungsschräge aufweisen, ist eine sehr einfache und sichere Einführung dieser Mitnahmezapfen in Durchgangslöcher im Schleifteller möglich, auch wenn eine geringe Verdrehung des Schleiftellers gegenüber seiner Endlage am Lagerflansch vorliegt.The fact that the driving pins each have an insertion bevel at their free ends, a very simple and safe introduction of this driving pins in through holes in the sanding plate is possible, even if there is a slight rotation of the sanding pad against its end position on the bearing flange.

Dadurch, dass auf dem Kreis immer abwechselnd ein Mitnahmezapfen und eine Schraubenbohrung angeordnet sind, wird eine gute Mitnahme des Schleiftellers bei gleichzeitig sicherer Befestigung desselben am Lagerflansch gewährleistet.The fact that on the circle always a driving pin and a bolt hole are arranged alternately, a good entrainment of the sanding pad while ensuring secure attachment of the same is guaranteed on the bearing flange.

Dadurch, dass die Mitnahmezapfen und die Schraubenbohrungen im Wesentlichen gleiche Durchmesser haben, können die Durchgangslöcher im Schleiftellers auch dieselben Durchmesser aufweisen. Hiermit wird eine größere Anzahl an möglichen Befestigungspositionen des Schleiftellers am Lagerflansch erreicht, wodurch sich die Montage vereinfacht.Due to the fact that the driving pins and the screw bores have substantially the same diameter, the through holes in the grinding disc can also have the same diameter. This achieves a larger number of possible attachment positions of the sanding disk on the bearing flange, which simplifies assembly.

Dadurch, dass eine Abdeckscheibe das Lager, das in einer Ausnehmung des Lagerflansches angeordnet ist, in axialer Richtung festlegt, wird eine sehr einfache und preiswert zu realisierende Möglichkeit der axialen Fixierung des Lagers erreicht. Darüber hinaus wird das Lager gegen Staub geschützt. Besonders vorteilhaft ist es dabei, wenn die Abdeckscheibe mit einem Eingriffsteil in radialer Richtung formschlüssig in die Ausnehmung des Lagerflansches eingreift. Hierdurch wird eine sehr gute axiale Festlegung des Lagers am Lagerflansch erreicht.Characterized in that a cover the bearing, which is arranged in a recess of the bearing flange, sets in the axial direction, a very simple and inexpensive to be realized possibility of axial fixation of the bearing is achieved. In addition, the bearing is protected against dust. It is particularly advantageous if the cover engages positively with an engagement member in the radial direction in the recess of the bearing flange. As a result, a very good axial fixation of the bearing is achieved on the bearing flange.

Dadurch, dass die Abdeckscheibe einen Kragen aufweist, der mit einem Zentralloch einer Einlegeplatte eines Schleiftellers in radialer Richtung formschlüssig in Eingriff bringbar ist, wird die Montage des Schleiftellers auf dem Lagerflansch nochmals vereinfacht.The fact that the cover has a collar which is positively engageable with a central hole of an insert plate of a sanding plate in the radial direction, the assembly of the sanding plate on the bearing flange is further simplified.

Dadurch, dass die Abdeckscheibe aus einem Kunststoff ist, wird eine elektrische Isolation hinsichtlich der Ankerwelle des Elektroschleifwerkzeugs erreicht.The fact that the cover is made of a plastic, electrical insulation is achieved with respect to the armature shaft of the electric grinding tool.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Further advantageous embodiments of the invention are the subject of the dependent claims.

Zeichnungendrawings

Ein Ausführungsbeispiel der Erfindung ist in der nachstehenden Beschreibung an Hand der zugehörigen Zeichnung näher erläutert.An embodiment of the invention is explained in more detail in the following description with reference to the accompanying drawings.

Die Figuren zeigen:

Figur 1
eine perspektivische Darstellung eines Lagers,
Figur 2
eine perspektivische Ansicht eines erfindungsgemäßen Lagerflansches,
Figur 3
eine perspektivische Darstellung einer erfindungsgemäßen Schleiftelleraufnahme, bei der die beiden Gegenstände der Figuren 1 und 2 zusammengesetzt sind,
Figur 4
eine Seitenansicht einer Abdeckscheibe,
Figur 5
eine Draufsicht auf einen Schleifteller,
Figur 6
einen Exzenterschleifer mit eingebauter erfindungsgemäßer Schleiftelleraufnahme gemäß Figur 3 und noch zu montierendem Schleifteller sowie
Figur 7
einen Exzenterschleifer wie in Figur 6 dargestellt mit aufmontiertem Schleifteller.
The figures show:
FIG. 1
a perspective view of a warehouse,
FIG. 2
a perspective view of a bearing flange according to the invention,
FIG. 3
3 is a perspective view of a sanding disk holder according to the invention, in which the two objects of FIGS. 1 and 2 are assembled,
FIG. 4
a side view of a cover,
FIG. 5
a top view of a sanding plate,
FIG. 6
an eccentric grinder with built-in inventive grinding disk holder according to Figure 3 and still to be mounted grinding plate and
FIG. 7
an eccentric grinder as shown in Figure 6 with mounted sanding pad.

In Figur 1 ist ein Lager 1 in Form eines Kugellagers dargestellt. Dieses Lager 1 dient zur Verbindung einer Antriebsachse eines handgeführten Elektroschleifwerkzeugs mit einem Schleifteller 5 (siehe Figuren 5 bis 7).FIG. 1 shows a bearing 1 in the form of a ball bearing. This bearing 1 serves to connect a drive axle a hand-held electric grinding tool with a sanding pad 5 (see Figures 5 to 7).

In Figur 2 ist ein erfindungsgemäßer Lagerflansch 2 dargestellt. An seiner dem Schleifteller 5 zugewandten Oberfläche 18 sind vier in axialer Richtung herausstehende Mitnahmezapfen 3 ausgebildet. Darüber hinaus weist die Oberfläche 18 auch noch vier Schraubenbohrungen 8 auf.FIG. 2 shows a bearing flange 2 according to the invention. On its side facing the sanding pad 5 surface 18 four protruding in the axial direction driving pin 3 are formed. In addition, the surface 18 also has four bolt holes 8.

Aus der Ansicht in Figur 3, in der das Lager 1 in eine Ausnehmung 17 des Lagerflansches 2 mittels Presssitzes radial fixiert ist, ist gut die räumliche Anordnung der Mitnahmezapfen 3 und der Schraubenbohrungen 8 zu erkennen.From the view in Figure 3, in which the bearing 1 is radially fixed by means of a press fit in a recess 17 of the bearing flange 2, the spatial arrangement of the driving pins 3 and the screw holes 8 can be seen well.

Die Mitnahmezapfen 3 und die Schraubenbohrungen 8 sind auf einem gemeinsamen Kreis um die Mittelachse des Lagerflansches 2 angeordnet. Die Abstände zwischen jeweils benachbarten Mitnahmezapfen 3 bzw. Schraubenbohrungen 8 sind gleich groß. Darüber hinaus sind die Mitnahmezapfen 3 und Schraubenbohrungen 8 immer abwechselnd auf dem Kreis angeordnet. Somit liegt immer eine Schraubenbohrung 8 zwischen zwei Mitnahmezapfen 3 bzw. umgekehrt.The driving pins 3 and the screw holes 8 are arranged on a common circle around the central axis of the bearing flange 2. The distances between each adjacent driving pin 3 and screw holes 8 are the same size. In addition, the driving pins 3 and screw holes 8 are always arranged alternately on the circle. Thus, there is always a screw hole 8 between two driving pins 3 and vice versa.

Die Mitnahmezapfen 3 sind an ihrem freien Ende mit jeweils einer Einführschräge 16 ausgebildet. Dadurch kann der Schleifteller 5 einfacher an den Lagerflansch 2 angeschraubt werden (siehe Figuren 6 und 7).The driving pins 3 are formed at their free end, each with an insertion bevel 16. As a result, the sanding pad 5 can be screwed onto the bearing flange 2 more easily (see FIGS. 6 and 7).

Der Lagerflansch 2 ist bevorzugt einstückig mit den Mitnahmezapfen 3 in Kunststoff ausgeführt. Dadurch weist er nur ein sehr geringes Gewicht auf und ist sehr einfach und preiswert herzustellen. Beispielsweise kann er durch einen einzigen Spritzgussvorgang mittels nur eines einzigen Spritzgusswerkzeuges hergestellt werden.The bearing flange 2 is preferably made in one piece with the driving pins 3 in plastic. As a result, it has only a very low weight and is very simple and inexpensive to manufacture. For example, it can be produced by a single injection molding process using only a single injection molding tool.

In Figur 4 ist eine Abdeckscheibe 4 dargestellt, die ein Eingriffsteil 7 sowie einen Kragen 9 aufweist. Die Abdeckscheibe 4 ist bevorzugt aus Kunststoff hergestellt, da sie dadurch sehr leicht ist sowie einfach und preiswert hergestellt werden kann. Darüber hinaus wird dadurch eine elektrische Isolation der Ankerwelle (nicht gezeigt) des Exzenterschleifers 15 gegenüber dem Schleifteller 5 erreicht. Nähere Einzelheiten, wie die Abdeckscheibe 4 mit dem Lagerflansch 2 und dem Schleifteller 5 zusammenwirkt, sind in den Figuren 6 und 7 dargestellt und werden unten ausgeführt.FIG. 4 shows a cover 4 which has an engagement part 7 and a collar 9. The cover 4 is preferably made of plastic, as it is very light and can be easily and inexpensively manufactured. In addition, an electrical isolation of the armature shaft (not shown) of the eccentric grinder 15 with respect to the sanding pad 5 is thereby achieved. Further details of how the cover 4 cooperates with the bearing flange 2 and the sanding pad 5 are shown in FIGS. 6 and 7 and are explained below.

In Figur 5 ist ein Schleifteller 5 dargestellt, der auf den Lagerflansch 2 aufgeschraubt wird (siehe Figuren 6 und 7). Der Schleifteller 5 weist eine Einlegeplatte 10 auf, die bevorzugt aus Kunststoff ist. Die Einlegeplatte 10 hat ein Zentralloch 13 und auf einem Kreis um die Mittelachse der Einlegeplatte 10 angeordnete Absauglöcher 14.FIG. 5 shows a sanding pad 5 which is screwed onto the bearing flange 2 (see FIGS. 6 and 7). The sanding pad 5 has an insert plate 10, which is preferably made of plastic. The insert plate 10 has a central hole 13 and arranged on a circle around the central axis of the insert plate 10 suction holes 14th

Darüber hinaus sind auf einem weiteren Kreis um die Mittelachse der Einlegeplatte 10 insgesamt acht äquidistant zueinander angeordnete Durchgangslöcher 12 ausgebildet. Der Radius dieses Kreises entspricht genau dem Radius des Kreises, auf dem die Mitnahmezapfen 3 und die Schraubenbohrungen 8 des Lagerflansches 2 angeordnet sind. Dadurch können die Durchgangslöcher 12 des Schleiftellers 5 in Deckung mit dem Mitnahmezapfen 3 und den Schraubenbohrungen 8 des Lagerflansches 2 gebracht werden. Näheres hierzu und zur Montage des Schleiftellers 5 auf den Lagerflansch 2 wird unten bezüglich der Figuren 6 und 7 ausgeführt.In addition, a total of eight equidistantly arranged through holes 12 are formed on a further circle about the central axis of the insert plate 10. The radius of this circle corresponds exactly to the radius of the circle on which the driving pins 3 and the screw holes 8 of the bearing flange 2 are arranged. As a result, the through holes 12 of the sanding pad 5 can be brought into coincidence with the driving pin 3 and the bolt holes 8 of the bearing flange 2. More about this and for mounting the sanding pad 5 on the bearing flange 2 is below with reference to Figures 6 and 7 executed.

Die Einlegeplatte 10 ist in bekannter Art und Weise mit einer Umschäumung 11 umschäumt. Da dies nicht erfindungswesentlich ist, wird hier nicht näher hierauf eingegangen.The insert plate 10 is foamed in a known manner with a foam 11. Since this is not essential to the invention, will not be discussed here in detail.

In Figur 6 ist ein vormontierter Exzenterschleifer 15 dargestellt, in den schon eine erfindungsgemäße Schleiftelleraufnahme (siehe Figur 3) montiert ist. Darüber hinaus ist in den Lagerflansch 2 der erfindungsgemäßen Schleiftelleraufnahme die Abdeckscheibe 4 eingesetzt. Das Eingriffsteil 7 (siehe Figur 4) der Abdeckscheibe 4 greift hier in die Ausnehmung 17 (siehe Figur 2) des Lagerflansches 2 ein und fixiert dabei das Lager 1 in axialer Richtung bezüglich des Lagerflansches 2. Somit steht lediglich noch der Kragen 9 der Abdeckscheibe 4 über die Oberfläche 18 des Lagerflansches 2 heraus. Die Abdeckscheibe 4 wirkt damit nicht nur als eine elektrische Isolation gegenüber der Ankerwelle, sondern schützt gleichzeitig das Lager 1 gegen Staubeintritt, was zu einer längeren Lebensdauer des Lagers 1 führt.FIG. 6 shows a preassembled eccentric sander 15 in which a sanding disk holder according to the invention (see FIG. 3) is already mounted. In addition, the cover plate 4 is inserted into the bearing flange 2 of the grinding disk holder according to the invention. The engagement member 7 (see Figure 4) of the cover 4 engages here in the recess 17 (see Figure 2) of the bearing flange 2 and thereby fixes the bearing 1 in the axial direction with respect to the bearing flange 2. Thus, only the collar 9 of the cover 4th over the surface 18 of the bearing flange 2 out. The cover 4 thus acts not only as an electrical insulation against the armature shaft, but also protects the bearing 1 against dust entry, resulting in a longer life of the bearing 1.

Bei der Montage des Schleiftellers 5 auf den Lagerflansch 2 dient die Abdeckscheibe 4 als Zentrierhilfe, da sie gut durch das Zentralloch 13 des Schleiftellers 5 gesehen werden kann. Damit muss der Schleifteller 5 nur noch in seiner Winkellage richtig angeordnet werden, damit die Mitnahemezapfen 3 in die Durchgangslöcher 12 eingreifen und er mittels Schrauben 6 fixiert werden kann. Bei den Schrauben 6 handelt es sich bevorzugt um vier Kunststoffformschrauben. Das richtige Aufsetzen bezüglich des Winkels des Schleiftellers 5 auf den Lagerflansch 2 wird durch die oben beschriebenen Einführschrägen 16 der Mitnahmezapfen 3 noch vereinfacht.When mounting the sanding pad 5 on the bearing flange 2, the cover 4 serves as a centering, since it can be seen well through the central hole 13 of the sanding pad 5. Thus, the sanding pad 5 must be properly arranged only in its angular position, so that the driving pins 3 engage in the through holes 12 and it can be fixed by means of screws 6. The screws 6 are preferably four plastic forming screws. The correct placement with respect to the angle of the sanding pad 5 on the bearing flange 2 is further simplified by the above-described insertion bevels 16 of the driving pins 3.

In dem in Figur 7 dargestellten fertig montierten Zustand des Exzenterschleifers 15 mit Schleifteller 5 ist gut zu erkennen, dass alle vier Mitnahmezapfen 3 sowie alle vier Schrauben 6 in den Durchgangslöchern 12 liegen. Darüber hinaus sind der Kragen 9 der Abdeckscheibe 4 und das Zentralloch 13 der Schleiftellers 5 so aufeinander abgestimmt, dass der Kragen 9 formschlüssig in radialer Richtung mit dem Zentralloch 13 abschließt.In the fully assembled state of the eccentric grinder 15 with sanding pad 5 shown in FIG. 7, it is easy to see that all four driving pins 3 and all four screws 6 lie in the through holes 12. In addition, the collar 9 of the cover 4 and the central hole 13 of the sanding pad 5 are matched to one another, that the collar 9 terminates positively in the radial direction with the central hole 13.

Das Auffinden des richtigen Winkels wird noch durch das Vorliegen von acht Möglichkeiten - bezüglich des Winkels - vereinfacht, in denen der Schleifteller 5 mit dem Lagerflansch 2 verbunden werden kann. Dies bedeutet, dass eine Montage alle 45° erfolgen kann.The finding of the correct angle is still by the presence of eight possibilities - in terms of angle - simplified, in which the sanding pad 5 can be connected to the bearing flange 2. This means that an assembly can be done every 45 °.

Es versteht sich von allein, dass die Erfindung keineswegs auf insgesamt acht Durchgangslöcher 12 im Schleifteller 5 sowie vier Mitnahmezapfen 3 und vier Schraubenbohrungen 8 beschränkt ist. Genau so gut kann eine größere oder kleinere Anzahl von Mitnahmezapfen 3 und Schraubenlöchern 8 gewählt werden. Ebenfalls ist es möglich, eine andere Abfolge von Mitnahmezapfen 3 und Schraubenbohrungen 8 zu wählen.It goes without saying that the invention is by no means limited to a total of eight through-holes 12 in the sanding pad 5 and four driving pins 3 and four bolt holes 8. Just as well, a larger or smaller number of driving pins 3 and 8 screw holes can be selected. It is also possible to choose a different sequence of driving pins 3 and 8 screw holes.

Wesentlich an der Erfindung ist lediglich, dass die Mitnahmezapfen 3 und die Schraubenbohrungen 8 auf einem einen gemeinsamen Kreis um die Mittelachse des Lagerflansches 2 und äquidistant zueinander angeordnet sind. Dabei spielt es keine Rolle, ob ein Durchgangsloch 12 auf einen Mitnahmezapfen 3 oder ein Schraubenloch 8 trifft. Zusammenfassend kann festgehalten werden, dass durch eine erfindungsgemäße Schleiftelleraufnahme eine sehr einfache Montage des Schleiftellers 5 auf den Lageflansch 2 möglich ist, wobei gleichzeitig eine Fehlmontage vermieden wird.Essential to the invention is merely that the driving pins 3 and the screw holes 8 are arranged on a common circle about the central axis of the bearing flange 2 and equidistant to each other. It does not matter whether a through hole 12 meets a driving pin 3 or a screw hole 8. In summary, it can be stated that a very simple mounting of the sanding pad 5 on the position flange 2 is possible by a sanding pad according to the invention, at the same time a wrong assembly is avoided.

Claims (10)

  1. Sanding plate receptacle for a hand-held electric sanding tool, in particular an eccentric sander (15), having a bearing flange (2) which has a plurality of driving pins (3), projecting above the surface (18) in the axial direction, and a plurality of screw holes (8), and having a bearing (1) which is secured on the bearing flange (2) in the axial and radial directions, characterized in that the driving pins (3) and the screw holes (8) are arranged on a common circle about the centre axis of the bearing flange (2) and in each case equidistantly from one another.
  2. Sanding plate receptacle according to Claim 1, characterized in that the driving pins (3) are formed in one piece with the bearing flange (2).
  3. Sanding plate receptacle according to Claim 1 or 2, characterized in that the bearing flange (2) and the driving pins (3) are made of plastic.
  4. Sanding plate receptacle according to one of the preceding claims, characterized in that the driving pins (3) each have an insertion bevel (16) on their free ends.
  5. Sanding plate receptacle according to one of the preceding claims, characterized in that a driving pin (3) and a screw hole (8) are always arranged alternately on the circle.
  6. Sanding plate receptacle according to one of the preceding claims, characterized in that the driving pins (3) and the screw holes (8) have essentially the same diameter.
  7. Sanding plate receptacle according to one of the preceding claims, characterized in that a cover disc (4) secures the bearing (1) in the axial direction, the bearing (1) being arranged in an aperture (17) of the bearing flange (2).
  8. Sanding plate receptacle according to Claim 7, characterized in that the cover disc (4) engages in the aperture (17) of the bearing flange (2) in a positive-locking manner in the radial direction by means of an engagement part (7).
  9. Sanding plate receptacle according to one of the preceding claims, characterized in that the cover disc (4) has a collar (9) which can be brought into engagement with a central hole (13) of an insert (10) of a sanding plate (5) in a positive-locking manner in the radial direction.
  10. Sanding plate receptacle according to one of Claims 7 to 9, characterized in that the cover disc (4) is made of plastic.
EP04786842A 2003-11-11 2004-09-24 Grinding-disk receiving element especially for a hand-guided electric grinding tool Active EP1687120B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10352501A DE10352501A1 (en) 2003-11-11 2003-11-11 Sanding plate holder for a hand-held electric grinding tool
PCT/DE2004/002126 WO2005049277A1 (en) 2003-11-11 2004-09-24 Grinding-disk receiving element especially for a hand-guided electric grinding tool

Publications (2)

Publication Number Publication Date
EP1687120A1 EP1687120A1 (en) 2006-08-09
EP1687120B1 true EP1687120B1 (en) 2007-05-30

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EP04786842A Active EP1687120B1 (en) 2003-11-11 2004-09-24 Grinding-disk receiving element especially for a hand-guided electric grinding tool

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US (1) US7217177B2 (en)
EP (1) EP1687120B1 (en)
CN (1) CN100553887C (en)
DE (2) DE10352501A1 (en)
WO (1) WO2005049277A1 (en)

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Also Published As

Publication number Publication date
DE502004003995D1 (en) 2007-07-12
US20060217048A1 (en) 2006-09-28
CN100553887C (en) 2009-10-28
EP1687120A1 (en) 2006-08-09
WO2005049277A1 (en) 2005-06-02
CN1878637A (en) 2006-12-13
US7217177B2 (en) 2007-05-15
DE10352501A1 (en) 2005-06-02

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