EP1687120A1 - 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

Info

Publication number
EP1687120A1
EP1687120A1 EP04786842A EP04786842A EP1687120A1 EP 1687120 A1 EP1687120 A1 EP 1687120A1 EP 04786842 A EP04786842 A EP 04786842A EP 04786842 A EP04786842 A EP 04786842A EP 1687120 A1 EP1687120 A1 EP 1687120A1
Authority
EP
European Patent Office
Prior art keywords
bearing flange
grinding plate
grinding
holder according
bearing
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.)
Granted
Application number
EP04786842A
Other languages
German (de)
French (fr)
Other versions
EP1687120B1 (en
Inventor
Alfred Frech
Tobias Lutz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1687120A1 publication Critical patent/EP1687120A1/en
Application granted granted Critical
Publication of EP1687120B1 publication Critical patent/EP1687120B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08—Circular back-plates for carrying flexible material
    • 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
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B45/00—Means for securing grinding wheels on rotary arbors

Definitions

  • the invention is based on a grinding plate holder for a hand-held electric grinding tool with the generic features of claim 1.
  • Grinding plate receptacles are known in which a ball bearing is inserted into 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 grinding 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 part of the bearing flange provided with the screw holes and the grinding plate. The screws run through guide grooves on the outside of the second part of the bearing flange.
  • such a construction is expensive to manufacture and difficult to assemble.
  • a grinding plate holder according to the invention with the features of claim 1 has the advantage over the fact that the arrangement of the driving pins and the screw holes on a common circle around the central axis of the bearing flange with simultaneous arrangement of adjacent driving pins or screw holes makes it simple Installation of a sanding plate is given because there are a variety of options for attaching it. At the same time, there can be no incorrect assembly when mounting the sanding plate, since the driver pins always engage in a through hole in the sanding plate.
  • the entire bearing flange can be produced in a single step. This is particularly advantageous when the bearing flange and the driving spigot are made of plastic, since only a single tool is required for producing the entire bearing flange.
  • the driving pins each have an insertion bevel at their free ends means that these driving pins can be inserted very easily and safely into through holes in the grinding plate, even if the grinding plate is slightly rotated relative to its end position on the bearing flange.
  • the through holes in the grinding plate can also have the same diameter.
  • a larger number of possible fastening positions of the grinding plate on the bearing flange is hereby achieved, which simplifies assembly.
  • a cover plate fixes the bearing, which is arranged in a recess of the bearing flange, in the axial direction, enables a very simple and inexpensive way of axially fixing the bearing.
  • the bearing is also protected against dust. It is particularly advantageous if the
  • Cover disc engages with an engagement part in the radial direction in a form-fitting manner in the recess of the bearing flange. In this way, a very good axial fixing of the bearing on the bearing flange is achieved.
  • cover disk has a collar, which can be positively engaged in the radial direction with a central hole of an insert plate of a grinding plate, further simplifies the mounting of the grinding plate on the bearing flange.
  • cover plate is made of a plastic, electrical insulation with respect to the armature shaft of the electric grinding tool is achieved. Further advantageous embodiments of the invention are the subject of the dependent claims.
  • FIG. 1 shows a perspective illustration of a bearing
  • FIG. 3 shows a perspective view of a grinding plate holder according to the invention, in which the two objects of FIGS. 1 and 2 are assembled,
  • FIG. 4 shows a side view of a cover pane
  • FIG. 5 shows a plan view of a grinding plate
  • FIG. 6 shows an eccentric sander with a built-in sanding plate holder according to the invention as shown in FIG.
  • Figure 7 shows an eccentric sander as shown in Figure 6 with mounted grinding plate.
  • a bearing 1 is shown in the form of a ball bearing. This bearing 1 serves to connect an Drive axis of a hand-held electric grinding tool with a grinding plate 5 (see Figures 5 to 7).
  • a bearing flange 2 according to the invention is shown in FIG. On its surface 18 facing the grinding plate 5, four driving pins 3 protruding in the axial direction are formed. In addition, the surface 18 also has four screw holes 8.
  • Recess 17 of the bearing flange 2 is fixed radially by means of a press fit, the spatial arrangement of the driving pins 3 and the screw holes 8 can be clearly seen.
  • the driving pin 3 and the screw holes 8 are arranged on a common circle around the central axis of the bearing flange 2.
  • the distances between adjacent driving pins 3 or screw holes 8 are the same size.
  • 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 or vice versa.
  • the driving pins 3 are each formed with an insertion bevel 16 at their free end. This makes it easier to screw the grinding plate 5 to the bearing flange 2 (see FIGS. 6 and 7).
  • the bearing flange 2 is preferably made in one piece with the driving pin 3 in plastic. As a result, it has 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 plate 4 which has an engagement part 7 and a collar 9.
  • the cover plate 4 is preferably made of plastic, since it is very light as a result and can be produced easily and inexpensively. In addition, this results in electrical insulation of the armature shaft (not shown) of the eccentric grinder 15 with respect to the grinding plate 5. Further details of how the cover plate 4 interacts with the bearing flange 2 and the grinding plate 5 are shown in FIGS. 6 and 7 and are explained below.
  • a grinding plate 5 is shown, which is screwed onto the bearing flange 2 (see Figures 6 and 7).
  • the grinding plate 5 has an insert plate 10, which is preferably made of plastic.
  • the insert plate 10 has a central hole 13 and suction holes 14 arranged on a circle around the central axis of the insert plate 10.
  • a total of eight through holes 12 arranged equidistantly from one another are formed on a further circle around 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 grinding plate 5 can be brought into congruence with the driving pin 3 and the screw holes 8 of the bearing flange 2. Further details on this and on the mounting of the grinding plate 5 on the bearing flange 2 are given below with reference to FIGS. 6 and 7.
  • FIG. 6 shows a preassembled eccentric grinder 15 in which a grinding plate holder according to the invention (see FIG. 3) is already installed.
  • the cover plate 4 is inserted into the bearing flange 2 of the grinding plate receptacles according to the invention.
  • the engagement part 7 (see FIG. 4) of the cover plate 4 here engages in the recess 17 (see FIG. 2) of the bearing flange 2 and fixes the bearing 1 in the axial direction with respect to the bearing flange 2.
  • the cover plate 4 thus not only acts as electrical insulation from the armature shaft, but at the same time protects the bearing 1 against the ingress of dust, which leads to a longer service life of the bearing 1.
  • the cover disk 4 serves as a centering aid, since it can be seen through the central hole 13 of the grinding plate 5.
  • the screws 6 are preferably four plastic molded screws. Proper placement with respect to the angle of the
  • Sanding plates 5 on the bearing flange 2 are further simplified by the above-described import bevels 16 of the driving pins 3.
  • Finding the correct angle is further simplified by the presence of eight options - with respect to the angle - in which the grinding plate 5 can be connected to the bearing flange 2. This means that assembly can take place every 45 °.
  • the invention is by no means limited to a total of eight through holes 12 in the grinding plate 5 as well as four driving pins 3 and four screw holes 8.
  • a larger or smaller number of driving pins 3 and screw holes 8 can be selected just as well. It is also possible to choose a different sequence of driving pins 3 and screw holes 8.
  • a grinding plate holder according to the invention makes it very easy to mount the grinding plate 5 on the mounting flange 2, while at the same time preventing incorrect mounting.

Abstract

The invention relates to a grinding-disk receiving element for a hand-guided electric grinding tool, in particular, an eccentric grinder (15). Said grinding disk comprises a bearing flange (2) which comprises several locking journals (3) protruding in an axial direction over the surface (18) and several screw bores (8), also comprising a bearing (1) which is arranged in an axial and a radial direction on the bearing flange (2). The locking journals (3) and the screw bores (8) are arranged in an equidistant manner in relation to each other in a common circle about the central axis of the bearing flange in order to mount the grinding disk (5) on the bearing flange in a simple and safe manner.

Description

Schleiftelleraufnahme für ein handgeführtes Elektro- schleifWerkzeugGrinding plate holder for a hand-held electric grinding tool
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 is based on a grinding plate 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 ra- dialer 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 La- gerflansches und dem Schleifteller eingeklemmt. Dabei laufen die Schrauben durch Führungsnuten an der Außenseite des zweiten Teils des Lager lansches. Eine solche Konstruktion ist jedoch teuer herzustellen und schwierig zu montieren.Grinding plate receptacles are known in which a ball bearing is inserted into 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 grinding 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 part of the bearing flange provided with the screw holes and the grinding plate. 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 Oberflache 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 an- geordnet, 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 driving pins on the surface of the bearing flange facing the grinding plate, which protrude above the surface in a circle around the central axis of the bearing flange. At the same time, a number of screw holes are arranged in the surface, which lie on a different circle. By a Screwing the grinding plate to the bearing flange, however, it is quite possible that the driving pins do not dip into a bore formed on the grinding plate and the functionality of the grinding tool is therefore not provided.
Vorteile der ErfindungAdvantages of the invention
Eine erfindungsgemäße Schleiftelleraufname mit den Merkma- len 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. Schrau- benbohrungen 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 Durch- gangsbohrung der Schleifplatte eingreifen.A grinding plate holder according to the invention with the features of claim 1 has the advantage over the fact that the arrangement of the driving pins and the screw holes on a common circle around the central axis of the bearing flange with simultaneous arrangement of adjacent driving pins or screw holes makes it simple Installation of a sanding plate is given because there are a variety of options for attaching it. At the same time, there can be no incorrect assembly when mounting the sanding plate, since the driver pins always engage in a through hole in 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.Because the driving pins are formed in one piece with the bearing flange, the entire bearing flange can be produced in a single step. This is particularly advantageous when the bearing flange and the driving spigot are made of plastic, since only a single tool is required for producing the entire bearing flange.
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. Dadurch, dass auf dem Kreis immer abwechselnd ein Mitnahmezapfen und eine Schraubenbohrung angeordnet sind, wird eine gute Mitnahme des Schleiftellers bei gleichzeitig si- cherer Befestigung desselben am Lagerflansch gewahrleistet.The fact that the driving pins each have an insertion bevel at their free ends means that these driving pins can be inserted very easily and safely into through holes in the grinding plate, even if the grinding plate is slightly rotated relative to its end position on the bearing flange. The fact that a driving pin and a screw hole are always arranged alternately on the circle ensures good driving of the grinding plate while at the same time securing it securely to 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.Because the driving pins and the screw holes have essentially the same diameter, the through holes in the grinding plate can also have the same diameter. A larger number of possible fastening positions of the grinding plate on the bearing flange is hereby achieved, 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 dieThe fact that a cover plate fixes the bearing, which is arranged in a recess of the bearing flange, in the axial direction, enables a very simple and inexpensive way of axially fixing the bearing. The bearing is also protected against dust. It is particularly advantageous if the
Abdeckscheibe mit einem Eingriffsteil in radialer Richtung formschlussig in die Ausnehmung des Lagerflansches eingreift. Hierdurch wird eine sehr gute axiale Festlegung des Lagers am Lagerflansch erreicht.Cover disc engages with an engagement part in the radial direction in a form-fitting manner in the recess of the bearing flange. In this way, a very good axial fixing of the bearing on the bearing flange is achieved.
Dadurch, dass die Abdeckscheibe einen Kragen aufweist, der mit einem Zentralloch einer Einlegeplatte eines Schleiftellers in radialer Richtung formschlussig in Eingriff bringbar ist, wird die Montage des Schleiftellers auf dem Lagerflansch nochmals vereinfacht.The fact that the cover disk has a collar, which can be positively engaged in the radial direction with a central hole of an insert plate of a grinding plate, further simplifies the mounting of the grinding plate on the bearing flange.
Dadurch, dass die Abdeckscheibe aus einem Kunststoff ist, wird eine elektrische Isolation hinsichtlich der Ankerwelle des Elektroschleifwerkzeugs erreicht. Weitere vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Because the cover plate is made of a plastic, electrical insulation with respect to the armature shaft of the electric grinding tool is achieved. 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:The figures show:
Figur 1 eine perspektivische Darstellung eines Lagers,FIG. 1 shows a perspective illustration of a bearing,
Figur 2 eine perspektivische Ansicht eines erfindungsge- mäßen Lagerflansches,FIG. 2 shows a perspective view of a bearing flange according to the invention,
Figur 3 eine perspektivische Darstellung einer erfindungsgemäßen Schleiftelleraufnahme, bei der die beiden Gegenstände der Figuren 1 und 2 zusammen- gesetzt sind,FIG. 3 shows a perspective view of a grinding plate holder according to the invention, in which the two objects of FIGS. 1 and 2 are assembled,
Figur 4 eine Seitenansicht einer Abdeckscheibe,FIG. 4 shows a side view of a cover pane,
Figur 5 eine Draufsicht auf einen Schleifteller,FIG. 5 shows a plan view of a grinding plate,
Figur 6 einen Exzenterschleifer mit eingebauter erfindungsgemäßer Schleiftelleraufnahme gemäß Figur 3 und noch zu montierendem Schleifteller sowie6 shows an eccentric sander with a built-in sanding plate holder according to the invention as shown in FIG
Figur 7 einen Exzenterschleifer wie in Figur 6 dargestellt mit aufmontiertem Schleifteller .Figure 7 shows an eccentric sander as shown in Figure 6 with mounted grinding plate.
In Figur 1 ist ein Lager 1 in Form eines Kugellagers dargestellt. Dieses Lager 1 dient zur Verbindung einer An- triebsachse eines handgeführten Elektroschleifwerkzeugs mit einem Schleifteller 5 (siehe Figuren 5 bis 7) .In Figure 1, a bearing 1 is shown in the form of a ball bearing. This bearing 1 serves to connect an Drive axis of a hand-held electric grinding tool with a grinding plate 5 (see Figures 5 to 7).
In Figur 2 ist ein erfindungsgemäßer Lagerflansch 2 darge- stellt. 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.A bearing flange 2 according to the invention is shown in FIG. On its surface 18 facing the grinding plate 5, four driving pins 3 protruding in the axial direction are formed. In addition, the surface 18 also has four screw holes 8.
Aus der Ansicht in Figur 3, in der das Lager 1 in eineFrom the view in Figure 3, in which the bearing 1 in a
Ausnehmung 17 des Lagerflansches 2 mittels Presssitzes radial fixiert ist, ist gut die räumliche Anordnung der Mitnahmezapfen 3 und der Schraubenbohrungen 8 zu erkennen.Recess 17 of the bearing flange 2 is fixed radially by means of a press fit, the spatial arrangement of the driving pins 3 and the screw holes 8 can be clearly seen.
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 Mitnahmezap en 3 und Schraubenbohrungen 8 immer abwechselnd auf dem Kreis angeordnet. Somit liegt immer eine Schraubenbohrung 8 zwischen zwei Mitnahmezapfen 3 bzw. umgekehrt.The driving pin 3 and the screw holes 8 are arranged on a common circle around the central axis of the bearing flange 2. The distances between adjacent driving pins 3 or 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 or 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 each formed with an insertion bevel 16 at their free end. This makes it easier to screw the grinding plate 5 to the bearing flange 2 (see FIGS. 6 and 7).
Der Lagerflansch 2 ist bevorzugt einstückig mit den Mit- nahmezapfen 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. 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 herge- stellt werden kann. Darüber hinaus wird dadurch eine e- lektrische 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 .The bearing flange 2 is preferably made in one piece with the driving pin 3 in plastic. As a result, it has 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 plate 4 which has an engagement part 7 and a collar 9. The cover plate 4 is preferably made of plastic, since it is very light as a result and can be produced easily and inexpensively. In addition, this results in electrical insulation of the armature shaft (not shown) of the eccentric grinder 15 with respect to the grinding plate 5. Further details of how the cover plate 4 interacts with the bearing flange 2 and the grinding plate 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 Absauglocher 14.In Figure 5, a grinding plate 5 is shown, which is screwed onto the bearing flange 2 (see Figures 6 and 7). The grinding plate 5 has an insert plate 10, which is preferably made of plastic. The insert plate 10 has a central hole 13 and suction holes 14 arranged on a circle around the central axis of the insert plate 10.
Dar ber hinaus sind auf einem weiteren Kreis um die Mittelachse der Einlegeplatte 10 insgesamt acht äquidistant zueinander angeordnete Durchgangslocher 12 ausgebildet. Der Radius dieses Kreises entspricht genau dem Radius des Kreises, auf dem die Mitnahmezapfen 3 und die Schrauben- bohrungen 8 des Lagerflansches 2 angeordnet sind. Dadurch können die Durchgangslocher 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 bezuglich der Figuren 6 und 7 ausgeführt.In addition, a total of eight through holes 12 arranged equidistantly from one another are formed on a further circle around 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 grinding plate 5 can be brought into congruence with the driving pin 3 and the screw holes 8 of the bearing flange 2. Further details on this and on the mounting of the grinding plate 5 on the bearing flange 2 are given below with reference to FIGS. 6 and 7.
Die Einlegeplatte 10 ist in bekannter Art und Weise mit einer ümschaumung 11 umschaumt. Da dies nicht erfindungswesentlich ist, wird hier nicht naher hierauf eingegangen. In Figur 6 ist ein vormontierter Exzenterschleifer 15 dargestellt, in den schon eine erfindungsgemaße Schleiftelleraufnahme (siehe Figur 3) montiert ist. Darüber hinaus ist in den Lagerflansch 2 der erfmdungsgemaßen Schleif- telleraufnähme 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 bezuglich des Lagerflansches 2. Somit steht lediglich noch der Kragen 9 der Abdeckscheibe 4 über die Oberflache 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 fuhrt.The insert plate 10 is covered with a foam 11 in a known manner. Since this is not essential to the invention, it will not be discussed in more detail here. FIG. 6 shows a preassembled eccentric grinder 15 in which a grinding plate holder according to the invention (see FIG. 3) is already installed. In addition, the cover plate 4 is inserted into the bearing flange 2 of the grinding plate receptacles according to the invention. The engagement part 7 (see FIG. 4) of the cover plate 4 here engages in the recess 17 (see FIG. 2) of the bearing flange 2 and fixes the bearing 1 in the axial direction with respect to the bearing flange 2. Thus, only the collar 9 of the cover plate 4 remains out over the surface 18 of the bearing flange 2. The cover plate 4 thus not only acts as electrical insulation from the armature shaft, but at the same time protects the bearing 1 against the ingress of dust, which leads to a longer service 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 wer- den kann. Damit muss der Schleifteller 5 nur noch in seiner Winkellage richtig angeordnet werden, damit die Mitna- hemezapfen 3 in die Durchgangslocher 12 eingreifen und er mittels Schrauben 6 fixiert werden kann. Bei den Schrauben 6 handelt es sich bevorzugt um vier Kunststoffformschrau- ben. Das richtige Aufsetzen bezuglich des Winkels desWhen mounting the grinding plate 5 on the bearing flange 2, the cover disk 4 serves as a centering aid, since it can be seen through the central hole 13 of the grinding plate 5. This means that the grinding plate 5 only has to be correctly arranged in its angular position so that the centering 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 molded screws. Proper placement with respect to the angle of the
Schleiftellers 5 auf den Lagerflansch 2 wird durch die o- ben beschriebenen Einfuhrschragen 16 der Mitnahmezapfen 3 noch vereinfacht.Sanding plates 5 on the bearing flange 2 are further simplified by the above-described import bevels 16 of the driving pins 3.
In dem in Figur 7 dargestellten fertig montierten Zustand des Exzenterschleifers 15 mit Schlei teller 5 ist gut zu erkennen, dass alle vier Mitnahmezapfen 3 sowie alle vier Schrauben 6 in den Durchgangslochern 12 liegen. Darüber hinaus sind der Kragen 9 der Abdeckscheibe 4 und das Zent- ralloch 13 der Schleiftellers 5 so aufeinander abgestimmt, dass der Kragen 9 formschlussig in radialer Richtung mit dem Zentralloch 13 abschließt.In the fully assembled state of the eccentric sander 15 with the grinding plate 5 shown in FIG. 7, it can be clearly seen 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 plate 4 and the central hole 13 of the grinding plates 5 are coordinated with one another in such a way that that the collar 9 is form-fitting in the radial direction with the central hole 13.
Das Auffinden des richtigen Winkels wird noch durch das Vorliegen von acht Möglichkeiten - bezuglich des Winkels - vereinfacht, in denen der Schleifteller 5 mit dem Lagerflansch 2 verbunden werden kann. Dies bedeutet, dass eine Montage alle 45° erfolgen kann.Finding the correct angle is further simplified by the presence of eight options - with respect to the angle - in which the grinding plate 5 can be connected to the bearing flange 2. This means that assembly can take place every 45 °.
Es versteht sich von allein, dass die Erfindung keineswegs auf insgesamt acht Durchgangslocher 12 im Schleifteller 5 sowie vier Mitnahmezapfen 3 und vier Schraubenbohrungen 8 beschrankt ist. Genau so gut kann eine größere oder kleinere Anzahl von Mitnahmezapfen 3 und Schraubenlochern 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 grinding plate 5 as well as four driving pins 3 and four screw holes 8. A larger or smaller number of driving pins 3 and screw holes 8 can be selected just as well. It is also possible to choose a different sequence of driving pins 3 and screw holes 8.
Wesentlich an der Erfindung ist lediglich, dass die Mit- nahmezapfen 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. Zusammenfas- send kann festgehalten werden, dass durch eine erfindungs- gemaße Schleiftelleraufnahme eine sehr einfache Montage des Schleiftellers 5 auf den Lageflansch 2 möglich ist, wobei gleichzeitig eine Fehlmontage vermieden wird. It is only essential to the invention that the driving pins 3 and the screw holes 8 are arranged on a common circle around the central axis of the bearing flange 2 and equidistant from one another. 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 grinding plate holder according to the invention makes it very easy to mount the grinding plate 5 on the mounting flange 2, while at the same time preventing incorrect mounting.

Claims

Ansprüche Expectations
1. Schleiftelleraufnahme für ein handgeführtes Elektro- Schleifwerkzeug, insbesondere einen Exzenterschleifer (15), mit einem Lagerflahsch (2), der mehrere in axialer Richtung über die Oberfläche (18) herausstehende Mitnahmezapfen (3) und mehrere Schraubenbohrungen (8) aufweist, und mit einem Lager (1), das in axialer und radialer Rich- tung am Lagerflansch (2) festgelegt ist, dadurch gekennzeichnet, dass die Mitnahmezapfen (3) und die Schraubenbohrungen (8) auf einem gemeinsamen Kreis um die Mittelachse des Lagerflansches (2) äquidistant zueinander angeordnet sind.1. Grinding plate holder for a hand-held electric grinding tool, in particular an eccentric grinder (15), with a bearing flange (2), which has a plurality of driving pins (3) protruding in the axial direction above the surface (18) and several screw bores (8), and with a bearing (1) which is fixed in the axial and radial direction on the bearing flange (2), characterized in that the driving pins (3) and the screw holes (8) are equidistant on a common circle around the central axis of the bearing flange (2) are arranged to each other.
2. Schleiftelleraufnahme nach Anspruch 1, dadurch gekennzeichnet, dass die Mitnahmezapfen (3) einstückig mit dem Lagerflansch (2) ausgebildet sind.2. Sanding disc holder according to claim 1, characterized in that the driving pins (3) are integrally formed with the bearing flange (2).
3. Schleiftelleraufnahme nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Lagerflansch (2) und die Mitnahmezapfen (3) aus einem Kunststoff sind.3. Sanding disc holder according to claim 1 or 2, characterized in that the bearing flange (2) and the driving pin (3) are made of a plastic.
4. Schleiftelleraufnahme nach einem der vorstehenden Ansprü- ehe, dadurch gekennzeichnet, dass die Mitnahmezapfen (3) an ihren freien Enden jeweils eine Einführschräge (16) aufweisen.4. Grinding plate holder according to one of the preceding claims, characterized in that the driving pins (3) each have an insertion bevel (16) at their free ends.
5. Schleiftelleraufnahme nach einem der vorstehenden Ansprü- ehe, dadurch gekennzeichnet, dass auf dem Kreis immer abwechselnd ein Mitnahmezapfen (3) und eine Schraubenbohrung (8) angeordnet sind.5. Grinding plate holder 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. Schleiftelleraufnahme nach einem der vorstehenden Ansprü- ehe, dadurch gekennzeichnet, dass die Mitnahmezapfen (3) und die Schraubenbohrungen (8) im Wesentlichen gleiche Durchmesser haben.6. Grinding plate holder 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. Schleiftelleraufnahme nach einem der vorstehenden Anspru- ehe, dadurch gekennzeichnet, dass eine Abdeckscheibe (4) das7. Grinding plate holder according to one of the preceding claims, characterized in that a cover disc (4)
Lager (1), das in einer Ausnehmung (17) des Lagerflansches (2) angeordnet ist, in axialer Richtung festlegt.Bearing (1), which is arranged in a recess (17) of the bearing flange (2), defines in the axial direction.
8. Schleiftelleraufnahme nach Anspruch 7, dadurch gekenn- zeichnet, dass die Abdeckscheibe (4) mit einem Eingriffsteil8. Grinding plate holder according to claim 7, characterized in that the cover disc (4) with an engagement part
(7) in radialer Richtung formschlussig in die Ausnehmung (17) des Lagerflansches (2) eingreift.(7) engages positively in the radial direction in the recess (17) of the bearing flange (2).
9. Schleiftelleraufnahme nach einem der vorstehenden Anspru- ehe, dadurch gekennzeichnet, dass die Abdeckscheibe (4) einen Kragen (9) aufweist, der mit einem Zentralloch (13) einer Einlegeplatte (10) eines Schleiftellers (5) in radialer Richtung formschlussig in Eingriff bringbar ist.9. Grinding plate holder according to one of the preceding claims, characterized in that the cover disc (4) has a collar (9) which engages in a radial manner with a central hole (13) of an insert plate (10) of a grinding plate (5) is feasible.
10. Schleiftelleraufnahme nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass die Abdeckscheibe (4) aus einem Kunststoff ist. 10. Sanding disc holder according to one of claims 7 to 9, characterized in that the cover disc (4) is made of a 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 true EP1687120A1 (en) 2006-08-09
EP1687120B1 EP1687120B1 (en) 2007-05-30

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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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Publication number Publication date
DE502004003995D1 (en) 2007-07-12
CN1878637A (en) 2006-12-13
DE10352501A1 (en) 2005-06-02
US7217177B2 (en) 2007-05-15
CN100553887C (en) 2009-10-28
EP1687120B1 (en) 2007-05-30
WO2005049277A1 (en) 2005-06-02
US20060217048A1 (en) 2006-09-28

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