EP0215476B1 - Rotary grinder with dust extraction-device - Google Patents

Rotary grinder with dust extraction-device Download PDF

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Publication number
EP0215476B1
EP0215476B1 EP86112837A EP86112837A EP0215476B1 EP 0215476 B1 EP0215476 B1 EP 0215476B1 EP 86112837 A EP86112837 A EP 86112837A EP 86112837 A EP86112837 A EP 86112837A EP 0215476 B1 EP0215476 B1 EP 0215476B1
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EP
European Patent Office
Prior art keywords
ring
grinding disk
grinding
bell
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86112837A
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German (de)
French (fr)
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EP0215476A2 (en
EP0215476A3 (en
Inventor
Hans J. Fabritius
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Festo SE and Co KG
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Festo SE and Co KG
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
Priority claimed from DE19853533668 external-priority patent/DE3533668A1/en
Priority claimed from DE19853537935 external-priority patent/DE3537935A1/en
Priority claimed from DE19863607106 external-priority patent/DE3607106A1/en
Priority claimed from DE19863620562 external-priority patent/DE3620562A1/en
Application filed by Festo SE and Co KG filed Critical Festo SE and Co KG
Priority to AT86112837T priority Critical patent/ATE51558T1/en
Publication of EP0215476A2 publication Critical patent/EP0215476A2/en
Publication of EP0215476A3 publication Critical patent/EP0215476A3/en
Application granted granted Critical
Publication of EP0215476B1 publication Critical patent/EP0215476B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools

Definitions

  • the invention relates to a rotary grinding device with a grinding plate mounted on an output shaft and a dust extraction device which has a dust collecting bell surrounding the grinding plate on the edge side and on the device side, forming an annular space, with a dust discharge channel connected to it, and a grinding surface of the grinding plate consisting of elastic, air-permeable material such as bristles protruding edge at the bottom of the dust collection bell.
  • a rotary grinder of the type mentioned is known for example from DE-OS 25 42 183 or US-PS 38 24 745.
  • air is drawn in from the outside through the air-permeable ring.
  • This suction flow detects the dust particles flying outwards from the underside of the grinding plate under the action of the centrifugal force and takes them to the dust discharge duct, from where they e.g. to a dust bag or into a line going to a central dust collector.
  • a disadvantage of the handling of these known rotary grinding devices is that grinding in corners and other hard-to-reach places is not possible because of the rim surrounding the grinding plate on all sides, as a result of which an unsanded edge strip remains on the surface to be ground.
  • an observation of the edge of the grinding plate is not possible, so that precise work is hardly possible.
  • the present invention is therefore based on the object of creating a rotary grinding device of the type mentioned at the outset which enables grinding even in hard-to-access and confined workplaces.
  • This object is achieved in that at least a partial ring of the ring is rotatably arranged around the grinding plate.
  • any edge area of the grinding plate that processes the respective workpiece can be exposed, so that the grinding plate can also reach corners and other hard-to-reach places.
  • the processing point can also be viewed.
  • the ring is divided into an inner partial ring and an outer partial ring of slightly different radii, the angular circumference of the two partial rings together being at least 360 °, and that each partial ring is displaceable in the circumferential direction in a slide guide concentric with the grinding plate relative to the other partial ring .
  • an arbitrarily long area of the grinding plate edge can be exposed at each circumferential point.
  • the dust collecting bell can have at least one viewing window which permits observation of the grinding plate edge, which can be formed by a flange ring arranged above the grinding plate edge.
  • the dust collecting bell has a clamping and clamping ring which can be plugged onto a device neck of the device housing and detachably fixed by means of quick-release means, an intermediate ring being arranged between the device neck and the clamping and clamping ring depending on the dimensions of the device neck.
  • the grinder can be quickly and easily switched from operating with dust extraction to operation without dust extraction by removing the dust collection bell.
  • the same dust collection bell can be attached to grinding devices of different types with a different device neck, since only an appropriately dimensioned intermediate ring has to be inserted for this.
  • Figure 1 shows a first embodiment of the invention, i. H. a grinding device 7, in the exemplary embodiment shown an angle grinder, with a dust extraction device 1 attached to it.
  • An output shaft 73 is guided out of the grinding device 7 at approximately a right angle to the longitudinal axis of the housing 71.
  • the output shaft 73 has a threaded mandrel 74 at its free end and is surrounded on the device side by a cylindrical device neck 72.
  • the dust extraction device 1 consists essentially of a dust collecting bell 2 which surrounds a grinding plate 5 screwed onto the threaded mandrel 74 of the device output shaft 73, and in the interior of which a radial fan 6 and a flow guide body 3 are arranged.
  • the radial fan 6 is in the upper part of the Bell 2 arranged, which is formed here from a cover part 21 and a side wall 22. Inwardly adjoins the side wall 22 of the flow guide body 3, which is connected in its outer edge region 33 to the side wall 22.
  • the flow guide body 3 is designed as an annular component and extends from the outside into the interior of the bell 2, where it ends at a distance from the upper part 53, 54 of the grinding plate 5.
  • An annular channel 82 is thus formed between the inside or underside 32 of the flow guide body 3 and the top side 53, 54 of the grinding plate 5, the upper end 82 ′ of which is designed as an axial inflow opening for the radial fan 6.
  • the fan 6 consists of a base plate 61, in which a central receptacle 63 for the output shaft 73 with wrench surfaces 73 'is inserted so that it cannot rotate.
  • the frictional connection of the fan 6 with the device output shaft 73 is carried out in the present case simply by clamping by means of the grinding plate 5 screwed onto the mandrel 74 by means of a fitting 54 provided with a suitable threaded bore Arrangement will be described with reference to the other figures.
  • the lower, d. H. that part of the bell 2 which surrounds the outer edge 52 of the grinding plate 5 is formed by two bristle rings 41 and 43 which can be displaced around the grinding plate 5 and each form approximately a semicircle in this exemplary embodiment.
  • the bristle rings 41 and 43 are each guided by means of brackets 42 and 44 in undercut grooves 34 and 35 in the outer part 33 of the flow guide body 3.
  • the bristle rings 41 and 43 serve to stop the dust particles 8 thrown outwards by centrifugal force from the grinding plate 5 or an abrasive disc 9 attached to its underside 51.
  • the upper part 21 of the bell 2 has a clamping or clamping ring 25 which concentrically surrounds the device neck 72 of the housing 71 of the grinding device 7.
  • the ring 25 By means of two screws 27, the ring 25 and thus the entire dust extraction device 1 can be quickly and easily fixed against the device neck 72.
  • an intermediate ring 26 is provided, which is designed to match the type of device. The intermediate ring 26 ensures a firm fit of the dust extraction device 1 and a correct position of the fan 6 within the bell 2.
  • the fan 6 has eight blades 62 which extend outwards and are bent backwards in the direction of rotation.
  • the central receiving piece 63 is arranged, which surrounds the device output shaft 73.
  • the dust collection channel 24 is connected to the dust discharge channel 23 via the connecting piece 23 '.
  • a dust discharge hose can also be connected to a stationary dust collection device.
  • the figure shows the courses of the bristle rings 41 and 43, which are concentric to one another and to the outside of the bell wall 22 in the form of two approximate semicircles.
  • a blocking device for blocking the rotation of the output shaft 73 of the rotary grinding device is shown as an example.
  • the blocking device shown consists of a pin 90 which is displaceable in its longitudinal direction and which is guided displaceably in its longitudinal direction in a guide bushing 92.
  • the pin 90 protrudes outward beyond the dust extraction bell and can be moved into the range of movement of the wings 62 by external pressure. Since the fan 6 is connected to the output shaft 73 in a rotationally secure manner with the blades 62, further rotation of the output shaft 73 is prevented.
  • the pin 90 has two locking troughs 93 which, in conjunction with locking lugs in the sleeve 92, prevent the blocking device from moving automatically or accidentally.
  • a further fuse can be provided, for example, so that the blocking device can be actuated only when the drive motor of the rotary grinding device is at a standstill or is designed such that a combined actuation of two elements is required.
  • the fan is shown again in a view of the wing side.
  • This figure clearly shows the shape of the wings 62 and their manner of attachment by means of base strips on the base plate 61.
  • the central receptacle 63 with its opening 64 for the output shaft 73 of the device 7 can again be seen.
  • the fan can also be equipped with more or fewer blades.
  • Both plastic and metal can be used as the material for the dust extraction device, which depends on the expected stress and the desired service life of the parts of the device.
  • parts of the device can also be produced in one piece as die-cast parts made of metal or as injection-molded parts made of plastic and not - as shown in the exemplary embodiment - as components composed of individual components screwed together.
  • FIG. 4 shows the invention in a second exemplary embodiment, large parts of FIG. 4 corresponding to FIG. 1.
  • FIG. 4 shows the invention in a second exemplary embodiment, large parts of FIG. 4 corresponding to FIG. 1.
  • the differences between the exemplary embodiments of the invention shown in FIGS. 1 and 4 relate on the one hand to the arrangement of the fan 6 and on the other hand to the design of the bristle ring 4.
  • the fan 6 is arranged on the upper side 53 of the grinding plate 5 in the annular channel 82.
  • the grinding plate 5 is provided on its upper side 53 with an annular groove 55 which runs concentrically to its axis of rotation and into which a support ring 61 'carrying several ventilation blades 62' is inserted in a positive and non-positive manner.
  • a support ring 61 'carrying several ventilation blades 62' is inserted in a positive and non-positive manner.
  • a further difference between the exemplary embodiment according to FIG. 4 and the exemplary embodiment shown in FIG. 1 consists in the configuration of the bristle ring 4, which here is formed from two concentric partial rings 41 and 43 which run completely around the grinding plate 5.
  • the two partial rings 41 and 43 alternately have sections of greater and shorter length, with a section of greater length of one ring opposite a section of shorter length of the other ring.
  • the ring 4 can also be made of a material other than bristles, such as. B. elastic foam or plastic.
  • FIG. 5 A third and last exemplary embodiment of the invention is finally shown in FIG. 5.
  • a viewing window 14 is arranged in the dust extraction bell 2 in a position allowing observation of the edge 52 of the grinding plate 5.
  • the flow guide body 3, a flange ring 17 forming the transparent window 14 and the brackets 42 and 44 of the bristle rings 41 and 43 are advantageously designed as screw rings concentric with one another and with the axis of rotation of the grinding plate 5.
  • the flange ring 17 is preferably made of plexiglass or acrylic glass and arranged in the area above the edge 52 of the grinding plate 5. It is detachably connected to the flow guide body 3 by means of a screw thread 19.
  • the holder 44 of the inner bristle ring 43 is in turn screwed onto the flange ring 17 on the outside by means of a screw thread 18 and the holder 42 of the outer bristle ring 41 is screwed onto the holder 44 on the outside by means of a screw thread 16, ie the holders 44 and 42 are each designed as screw rings 16 and 15.
  • FIG. 5 Another feature of the invention that can be seen in FIG. 5 is the arrangement of dust extraction channels 56 known per se and running through the grinding plate 5 and the abrasive disc 50 placed on its underside 51. While these channels 56 in the prior art in a direction parallel to the axis of rotation of the Grinding plates 5 run, they are executed here obliquely according to the present invention.
  • the inclination of the channels 56 is chosen so that the lower ends 57 are advanced relative to the upper ends 58 when viewed in the direction of rotation.
  • the upper ends 58 of the channels 56 open into the intermediate space 82 between the grinding plate 5 and the flow guide body 3. This ensures that the grinding plate 5 also produces a certain ventilation effect, whereby the efficiency of the dust extraction can be further improved.
  • FIGS. 1 to 4 For the other reference numbers appearing in FIG. 5, reference is made to the description of the preceding FIGS. 1 to 4.

Description

Die Erfindung betrifft ein Rotationsschleifgerät mit einem auf einer Abtriebswelle montierten Schleifteller und einer Staubabsaugvorrichtung, die eine den Schleifteller randseitig und geräteseitig unter Bildung eines Ringraums umgebende Staubfangglocke mit einem daran angeschlossenen Staubableitungskanal und einem aus elastischem, luftdurchlässigem Material wie Borsten bestehenden, die Schleiffläche des Schleiftellers etwas überragenden Rands am unteren Rand der Staubfangglocke aufweist.The invention relates to a rotary grinding device with a grinding plate mounted on an output shaft and a dust extraction device which has a dust collecting bell surrounding the grinding plate on the edge side and on the device side, forming an annular space, with a dust discharge channel connected to it, and a grinding surface of the grinding plate consisting of elastic, air-permeable material such as bristles protruding edge at the bottom of the dust collection bell.

Ein Rotationsschleifgerät der genannten Art ist beispielsweise aus der DE-OS 25 42 183 oder der US-PS 38 24 745 bekannt. Beim Betrieb solcher Geräte wird durch den luftdurchlässigen Kranz hindurch Luft von aussen her angesaugt. Dieser Saugstrom erfaßt die von der Unterseite des Schleiftellers unter der Wirkung der Zentrifugalkraft nach aussen fliegenden Staubteilchen und nimmt diese zum Staubableitungskanal mit, von wo sie z.B. zu einem Staubfangsack oder in eine zu einer zentralen Staubsammeleinrichtung gehenden Leitung geführt werden.A rotary grinder of the type mentioned is known for example from DE-OS 25 42 183 or US-PS 38 24 745. When operating such devices, air is drawn in from the outside through the air-permeable ring. This suction flow detects the dust particles flying outwards from the underside of the grinding plate under the action of the centrifugal force and takes them to the dust discharge duct, from where they e.g. to a dust bag or into a line going to a central dust collector.

Nachteilig bei der Handhabung dieser bekannten Rotationsschleifgeräte ist, daß wegen des den Schleifteller allseitig umgebenden Kranzes ein Schleifen in Ecken und anderen schwer zugänglichen Stellen nicht möglich ist, wodurch ein ungeschliffener Randstreifen auf der zu schleifenden Fläche verbleibt. Ausserdem ist eine Beobachtung des Randes des Schleiftellers nicht möglich, so daß ein exaktes Arbeiten kaum möglich ist. Der vorliegenden Erfindung liegt deshalb die Aufgabe zugrunde, ein Rotationsschleifgerät der eingangs genannten Art zu schaffen, das ein Schleifen auch an schwer zugänglichen und beengten Arbeitsstellen ermöglicht.A disadvantage of the handling of these known rotary grinding devices is that grinding in corners and other hard-to-reach places is not possible because of the rim surrounding the grinding plate on all sides, as a result of which an unsanded edge strip remains on the surface to be ground. In addition, an observation of the edge of the grinding plate is not possible, so that precise work is hardly possible. The present invention is therefore based on the object of creating a rotary grinding device of the type mentioned at the outset which enables grinding even in hard-to-access and confined workplaces.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß mindestens ein Teilkranz des Kranzes um den Schleifteller herum verdrehbar angeordnet ist.This object is achieved in that at least a partial ring of the ring is rotatably arranged around the grinding plate.

Auf diese Weise kann jeder beliebige, das jeweilige Werkstück bearbeitende Randbereich des Schleiftellers frei gelegt werden, so daß der Schleifteller auch in Ecken und in andere schlecht zugängliche Stellen gelangen kann. Ausserdem kann die Bearbeitungsstelle eingesehen werden.In this way, any edge area of the grinding plate that processes the respective workpiece can be exposed, so that the grinding plate can also reach corners and other hard-to-reach places. The processing point can also be viewed.

Zweckmäßigerweise ist vorgesehen, daß der Kranz in einen inneren Teilkranz und einen äußeren Teilkranz geringfügig unterschiedlicher Radien geteilt ist, wobei der Winkelumfang beider Teilkränze zusammen mindestens 360° beträgt, und daß jeder Teilkranz in einer zum Schleifteller konzentrischen Gleitführung gegenüber dem anderen Teilkranz in Umfangsrichtung verschiebbar ist. In einem solchen Falle läßt sich an jeder Umfangsstelle ein beliebig langer Bereich des Schleiftellerrandes freilegen.It is expediently provided that the ring is divided into an inner partial ring and an outer partial ring of slightly different radii, the angular circumference of the two partial rings together being at least 360 °, and that each partial ring is displaceable in the circumferential direction in a slide guide concentric with the grinding plate relative to the other partial ring . In such a case, an arbitrarily long area of the grinding plate edge can be exposed at each circumferential point.

Des weiteren können zwei konzentrisch umlaufende Teilkränze vorhanden sein, die in Umfangsrichtung aufeinander folgende Abschnitte größerer und kleinerer Länge nach Art von nach unten abstehenden rechteckigen Zinnen aufweisen, so daß jeweils einem Abschnitt kleinerer Länge des einen Teilkranzes ein Abschnitt größerer Länge des anderen Teilkranzes gegenübersteht. Hierdurch wird das Einströmen von Luft von außen her in den Zwischenraum zwischen dem Schleifteller und dem Kranz wesentlich erleichtert, ohne daß die vom Schleifteller weg fliegenden Schleifstaubpartikel den Kranz durchdringen könnten.Furthermore, there can be two concentrically circumferential partial wreaths, which in the circumferential direction have successive sections of greater and smaller length in the manner of rectangular pinnacles protruding downward, so that a section of greater length of one partial wreath is opposed by a section of greater length of the other partial wreath. As a result, the inflow of air from the outside into the intermediate space between the grinding plate and the ring is considerably facilitated without the grinding dust particles flying away from the grinding plate being able to penetrate the ring.

Zusätzlich kann die Staubfangglocke mindestens ein die Beobachtung des Schleiftellerrandes erlaubendes Sichtfenster aufweisen, das von einem oberhalb des Schleiftellerrandes angeordneten Flanschring gebildet werden kann.In addition, the dust collecting bell can have at least one viewing window which permits observation of the grinding plate edge, which can be formed by a flange ring arranged above the grinding plate edge.

Eine weitere zweckmäßige Maßnahme besteht darin, daß die Staubfangglocke einen auf einen Gerätehals des Gerätegehäuses aufsteckbaren und mittels Schnellspannmitteln lösbarfestlegbaren Klemm- und Spannring aufweist, wobei je nach den Abmessungen des Gerätehalses zwischen dem Gerätehals und dem Klemm- und Spannring ein Zwischenring angeordnet wird. In einem solchen Falle kann das Schleifgerät schnell und mühelos vom Betrieb mit Staubabsaugung auf einen Betrieb ohne Staubabsaugung umgestellt werden, indem die Staubfangglocke abgenommen wird. Des weiteren kann die gleiche Staubfangglocke an Schleifgeräten unterschiedlichen Typs mit anderem Gerätehals befestigt werden, da hierzu nur ein entsprechend dimensionierter Zwischenring eingesetet werden muß.A further expedient measure is that the dust collecting bell has a clamping and clamping ring which can be plugged onto a device neck of the device housing and detachably fixed by means of quick-release means, an intermediate ring being arranged between the device neck and the clamping and clamping ring depending on the dimensions of the device neck. In such a case, the grinder can be quickly and easily switched from operating with dust extraction to operation without dust extraction by removing the dust collection bell. Furthermore, the same dust collection bell can be attached to grinding devices of different types with a different device neck, since only an appropriately dimensioned intermediate ring has to be inserted for this.

Drei bevorzugte Ausführungsbeispiele der Erfindung werden im folgenden anhand einer Zeichnung näher erläutert. Die Figuren der Zeichnung zeigen im einzelnen:

  • Figur 1 ein Rotationsschleifgerät gemäß Erfindung in Seitenansicht, teils im Schnitt, in einer ersten Ausführung,
  • Figur 2 das Gerät aus Figur 1 im Schnitt entlang der Linie A-A in Figur 1,
  • Figur 3 einen Ventilator als Teil des Gerätes nach Figur 1 und Figur 2 in Draufsicht,
  • Figur 4 ein Rotationsschleifgerät in Seitenansicht, teils im Schnitt, in einer zweiten Ausführung und
  • Figur 5 ein Rotationsschleifgerät in einer Teildarstellung im Bereich der Staubabsaugvorrichtung in Seitenansicht, teils im Schnitt, in einer dritten Ausführung.
Three preferred exemplary embodiments of the invention are explained in more detail below with reference to a drawing. The figures in the drawing show in detail:
  • FIG. 1 shows a rotary grinding device according to the invention in a side view, partly in section, in a first embodiment,
  • FIG. 2 shows the device from FIG. 1 in section along the line AA in FIG. 1,
  • 3 shows a fan as part of the device according to FIG. 1 and FIG. 2 in plan view,
  • Figure 4 shows a rotary grinder in side view, partly in section, in a second embodiment and
  • Figure 5 shows a rotary grinder in a partial view in the area of the dust extraction device in side view, partly in section, in a third embodiment.

Die Figur 1 zeigt ein erstes Ausführungsbeispiel der Erfindung, d. h. ein Schleifgerät 7, im dargestellten Ausführungsbeispiel ein Winkelschleifer, mit einer an dieses angebauten Staubabsaugvorrichtung 1. Eine Abtriebswelle 73 ist hier etwa rechtwinklig zur Längsachse des Gehäuses 71 des Schleifgerätes 7 aus diesem herausgeführt. Die Abtriebswelle 73 weist an ihrem freien Ende einen Gewindedorn 74 auf und ist geräteseitig von einem zylindrischen Gerätehals 72 umgeben.Figure 1 shows a first embodiment of the invention, i. H. a grinding device 7, in the exemplary embodiment shown an angle grinder, with a dust extraction device 1 attached to it. An output shaft 73 is guided out of the grinding device 7 at approximately a right angle to the longitudinal axis of the housing 71. The output shaft 73 has a threaded mandrel 74 at its free end and is surrounded on the device side by a cylindrical device neck 72.

Die Staubabsaugvorrichtung 1 besteht im wesentlichen aus einer Staubfangglocke 2, die einen auf den Gewindedorn 74 der Geräteabtriebswelle 73 aufgeschraubten Schleifteller 5 umgibt, und in deren Innerem ein Radialventilator 6 sowie ein Strömungsleitkörper 3 angeordnet sind. Der Radialventilator 6 ist im oberen Teil der Glocke 2 angeordnet, die hier aus einem Deckelteil 21 und einer Seitenwandung 22 gebildet ist. Nach innen schließt sich an die Seitenwandung 22 der Strömungsleitkörper 3 an, der in seinem äußeren Randbereich 33 mit der Seitenwandung 22 verbunden ist. Der Strömungsleitkörper 3 ist als ringförmiges Bauteil ausgebildet und erstreckt sich von außen in das Innere der Glocke 2 hinein, wo er im Abstand vom oberen Teil 53, 54 des Schleiftellers 5 endet. Zwischen der Innen- bzw. Unterseite 32 des Strömungsleitkörpers 3 und der Oberseite 53, 54 des Schleiftellers 5 wird so ein Ringkanal 82 gebildet, dessen oberes Ende 82' als axiale Einströmöffnung für den Radialventilator 6 ausgebildet ist. Der Ventilator 6 besteht aus einer Grundplatte 61, in welcher ein zentrales Aufnahmestück 63 für die Abtriebswelle 73 mit Schraubenschlüsselflächen 73' verdrehsicher eingesetzt ist. Die kraftschlüssige Verbindung des Ventilators 6 mit der Geräteabtriebswelle 73 erfolgt im vorliegenden Fall einfach durch Einklemmen mittels des auf den Gewindedorn 74 mittels eines mit einer passenden Gewindebohrung versehenen Anschlußstückes 54 aufgeschraubten Schleiftellers 5. Mit der Grundplatte 61 des Ventilators 6 sind mehrere Flügel 62 verbunden, deren Anordnung anhand der weiteren Figuren noch näher beschrieben wird.The dust extraction device 1 consists essentially of a dust collecting bell 2 which surrounds a grinding plate 5 screwed onto the threaded mandrel 74 of the device output shaft 73, and in the interior of which a radial fan 6 and a flow guide body 3 are arranged. The radial fan 6 is in the upper part of the Bell 2 arranged, which is formed here from a cover part 21 and a side wall 22. Inwardly adjoins the side wall 22 of the flow guide body 3, which is connected in its outer edge region 33 to the side wall 22. The flow guide body 3 is designed as an annular component and extends from the outside into the interior of the bell 2, where it ends at a distance from the upper part 53, 54 of the grinding plate 5. An annular channel 82 is thus formed between the inside or underside 32 of the flow guide body 3 and the top side 53, 54 of the grinding plate 5, the upper end 82 ′ of which is designed as an axial inflow opening for the radial fan 6. The fan 6 consists of a base plate 61, in which a central receptacle 63 for the output shaft 73 with wrench surfaces 73 'is inserted so that it cannot rotate. The frictional connection of the fan 6 with the device output shaft 73 is carried out in the present case simply by clamping by means of the grinding plate 5 screwed onto the mandrel 74 by means of a fitting 54 provided with a suitable threaded bore Arrangement will be described with reference to the other figures.

Den unteren, d. h. den den äußeren Rand 52 des Schleiftellers 5 umgebenden Teil der Glocke 2 bilcden zwei um den Schleifteller 5 herum verschiebbare Borstenkränze 41 und 43, die bei diesem Ausführungsbeispiel jeweils etwa einen Halbkreis bilden. Die Borstenkränze 41 und 43 sind jeweils mittels Halterungen 42 und 44 in hinterschnittenen Nuten 34 und 35 im äußeren Teil 33 des Strömungsleitkörpers 3 geführt. Die Borstenkränze 41 und 43 dienen dazu, die von dem Schleifteller 5 bzw. einer an dessen Unterseite 51 angebrachten Schleifmittelscheibe 9 unter Zentrifugalkraftwirkung nach außen geschleuderten Staubpartikel 8 aufzuhalten. Da die Borstenkränze 41 und 43 luftdurchlässig sind, werden die dort abgebremsten Staubpartikel 8 von der von außen einströmenden Luft erfaßt und durch den Zwischenraum 81 zwischen dem äußeren Rand 52 der Schleifscheibe 5 und dem Borstenkranz 43 bzw. 41 sowie durch den Ringkanal 82 nach oben zum Ventilator 6 befördert. Von dort gelangt der Luft-Partikel-Strom in noch näher zu beschreibender Weise durch einen Staubableitungskanal 23 in einen beispielhaft teilweise dargestellten Staubfangsack 24, der mittels eines Anschlußstückes 23' mit dem Ableitungskanal 23 verbunden ist.The lower, d. H. that part of the bell 2 which surrounds the outer edge 52 of the grinding plate 5 is formed by two bristle rings 41 and 43 which can be displaced around the grinding plate 5 and each form approximately a semicircle in this exemplary embodiment. The bristle rings 41 and 43 are each guided by means of brackets 42 and 44 in undercut grooves 34 and 35 in the outer part 33 of the flow guide body 3. The bristle rings 41 and 43 serve to stop the dust particles 8 thrown outwards by centrifugal force from the grinding plate 5 or an abrasive disc 9 attached to its underside 51. Since the bristle rings 41 and 43 are permeable to air, the dust particles 8 braked there are caught by the air flowing in from outside and through the space 81 between the outer edge 52 of the grinding wheel 5 and the bristle ring 43 or 41 and through the annular channel 82 upwards Fan 6 promoted. From there, the air-particle flow arrives in a manner to be described in more detail through a dust discharge duct 23 into a dust collection bag 24, which is shown by way of example and which is connected to the discharge duct 23 by means of a connecting piece 23 '.

Zur Verbindung der Staubabsaugvorrichtung 1 mit dem Schleifgerät 7 weist das Oberteil 21 der Glocke 2 einen Klemm- oder Spannring 25 auf, der den Gerätehals 72 des Gehäuses 71 des Schleifgerätes 7 konzentrisch umgibt. Mittels zweier Schrauben 27 ist der Ring 25 und damit die gesamte Staubabsaugvorrichtung 1 schnell und einfach gegen den Gerätehals 72 festlegbar. Zum Ausgleich unterschiedlicher Halsdurchmesser, Halslängen und Abtriebswellen-Längen ist ein Zwischenring 26 vorgesehen, der je nach Gerätetyp passend ausgeführt ist. Der Zwischenring 26 sorgt für einen festen Sitz der Staubabsaugvorrichtung 1 sowie für eine korrekte Lage des Ventilators 6 innerhalb der Glocke 2.To connect the dust extraction device 1 to the grinding device 7, the upper part 21 of the bell 2 has a clamping or clamping ring 25 which concentrically surrounds the device neck 72 of the housing 71 of the grinding device 7. By means of two screws 27, the ring 25 and thus the entire dust extraction device 1 can be quickly and easily fixed against the device neck 72. To compensate for different neck diameters, neck lengths and output shaft lengths, an intermediate ring 26 is provided, which is designed to match the type of device. The intermediate ring 26 ensures a firm fit of the dust extraction device 1 and a correct position of the fan 6 within the bell 2.

Aus dem in Figur 2 dargestellten Horizontalschnitt entlang der Linie A-A in Figur 1 ist besonders deutlich die Anordnung der Flügel 62 des Ventilators 6 sowie die Ausformung des Inneren 83 des den Ventilator 6 umgebenden Teils der Glocke, d. h. hier ihrer Seitenwandung 22 zu erkennen. Im dargestellten Ausführungsbeispiel weist der Ventilator 6 acht Flügel 62 auf, die sich nach außen erstrecken und in Rotationsrichtung nach hinten gebogen sind. In der Mitte des Ventilators 6 ist das zentrale Aufnahmestück 63 angeordnet, das die Geräteabtriebswelle 73 umgibt. Hierdurch wird bei Rotation des Ventilators 6 die durch die in der Mitte der Figur 2 erkennbare axiale Einströmöffnung 82' einströmende Luft zusammen mit den von dieser beförderten Staubpartikeln - wie durch die Strömungspfeile angedeutet - entlang der Seitenwandung 22 durch das Innere 83 der Glocke 2 zum Staubableitungskanal 23 gefördert. Außerhalb der axialen Einströmöffnung 82' ist der Bewegungsraum des Ventilators 6 nach unten durch den Strömungsleitkörper 3 begrenzt, so daß eine sehr effektive Luftförderung erfolgt und ein starker Luftstrom erzeugt wird. Die Förderung des Luft-Partikel-Stromes aus dem Inneren 83 der Glocke in den Staubableitungskanal 23 wird durch die spiralig sich erweiternde Ausgestaltung der Seitenwandung 22 unterstützt. An den Staubableitungskanal 23 schließt sich - wie bereits beschrieben - wieder der Staubfangsack 24 über das Anschlußstück 23' an. Anstelle des Staubfangsackes kann hier auch ein Staubableitungsschlauch zu einer stationären Staubsammeleinrichtung angeschlossen sein. Weiterhin sind der Figur noch die Verläufe der Borstenkränze 41 und 43 zu entnehmen, die in Form zweier angenäherter Halbkreise konzentrisch zueinander und zu der Außenseite der Glockenwandung 22 verlaufen.From the horizontal section shown in FIG. 2 along the line A-A in FIG. 1, the arrangement of the blades 62 of the fan 6 and the shape of the interior 83 of the part of the bell surrounding the fan 6, ie. H. their side wall 22 can be seen here. In the exemplary embodiment shown, the fan 6 has eight blades 62 which extend outwards and are bent backwards in the direction of rotation. In the middle of the fan 6, the central receiving piece 63 is arranged, which surrounds the device output shaft 73. As a result, when the fan 6 rotates, the air flowing in through the axial inflow opening 82 ′ which can be seen in the middle of FIG. 2 together with the dust particles conveyed by it - as indicated by the flow arrows - along the side wall 22 through the interior 83 of the bell 2 to the dust discharge duct 23 funded. Outside the axial inflow opening 82 ', the movement space of the fan 6 is limited at the bottom by the flow guide body 3, so that very effective air delivery takes place and a strong air flow is generated. The conveyance of the air-particle flow from the interior 83 of the bell into the dust discharge duct 23 is supported by the spirally expanding configuration of the side wall 22. As already described, the dust collection channel 24 is connected to the dust discharge channel 23 via the connecting piece 23 '. Instead of the dust bag, a dust discharge hose can also be connected to a stationary dust collection device. Furthermore, the figure shows the courses of the bristle rings 41 and 43, which are concentric to one another and to the outside of the bell wall 22 in the form of two approximate semicircles.

Im rechten Teil der Figur 2 ist beispielhaft eine Blockiervorrichtung zur Blockierung der Drehung der Abtriebswelle 73 des Rotationsschleifgerätes dargestellt. Die gezeigte Blockiervorrichtung besteht aus einem in seiner Längsrichtung verschiebbaren Stift 90, der in einer Führungsbuchse 92 in seiner Längsrichtung verschiebbar geführt ist. Der Stift 90 ragt nach außen über die Staubabsaugglocke vor und kann durch Druck von außen in den Bewegungsbereich der Flügel 62 bewegt werden. Da der Ventilator 6 mit den Flügeln 62 verdrehsicher mit der Abtriebswelle 73 verbunden ist, wird so eine weitere Drehung der Abtriebswelle 73 verhindert. Zur Vermeidung eines unbeabsichtigten Betätigens des Stiftes 90 weist dieser zwei Rastmulden 93 auf, welche in Verbindung mit in der Hülse 92 vorhandenen Rastnasen eine selbsttätige oder zufällige Bewegung der Blockiervorrichtung verhindert. Zusätzlich kann eine weitere Sicherung vorgesehen werden, die beispielsweise so ausgeführt ist, daß lediglich bei Stillstand des Antriebsmotors des Rotationsschleifgerätes die Blockiervorrichtung betätigt werden kann oder die so ausgeführt ist, daß eine kombinierte Betätigung zweier Elemente erforderlich ist.In the right part of FIG. 2, a blocking device for blocking the rotation of the output shaft 73 of the rotary grinding device is shown as an example. The blocking device shown consists of a pin 90 which is displaceable in its longitudinal direction and which is guided displaceably in its longitudinal direction in a guide bushing 92. The pin 90 protrudes outward beyond the dust extraction bell and can be moved into the range of movement of the wings 62 by external pressure. Since the fan 6 is connected to the output shaft 73 in a rotationally secure manner with the blades 62, further rotation of the output shaft 73 is prevented. In order to avoid inadvertent actuation of the pin 90, the pin 90 has two locking troughs 93 which, in conjunction with locking lugs in the sleeve 92, prevent the blocking device from moving automatically or accidentally. In addition, a further fuse can be provided, for example, so that the blocking device can be actuated only when the drive motor of the rotary grinding device is at a standstill or is designed such that a combined actuation of two elements is required.

In Figur 3 ist noch einmal der Ventilator für sich in einer Ansicht auf die Flügelseite dargestellt. Aus dieser Figur ist deutlich die Ausformung der Flügel 62 sowie deren Anbringungsweise mittels Sockelstreifen auf der Grundplatte 61 erkennbar. In der Mitte des Ventilators 6 ist wiederum das zentrale Aufnahmestück 63 mit seiner Öffnung 64 für die Abtriebswelle 73 des Gerätes 7 erkennbar.In Figure 3, the fan is shown again in a view of the wing side. This figure clearly shows the shape of the wings 62 and their manner of attachment by means of base strips on the base plate 61. In the center of the fan 6, the central receptacle 63 with its opening 64 for the output shaft 73 of the device 7 can again be seen.

Außer wie im dargestellten Ausführungsbeispiel mit acht Flügeln kann der Ventilator auch mit mehr oder weniger Flügeln ausgestattet sein. Als Material für die Staubabsaugvorrichtung kann sowohl Kunststoff als auch Metall verwendet werden, was sich je nach der zu erwartenden Beanspruchung und der gewünschten Lebensdauer der Teile der Vorrichtung richtet. Zur Vereinfachung der Herstellung können Teile der Vorrichtung auch als Druckgußteile aus Metall oder als Spritzgußteile aus Kunststoff einstückig gefertigt sein und nicht - wie im Ausführungsbeispiel dargestellt - als aus miteinander verschraubten Einzelbauteilen zusammengesetzte Bauelemente.Except as in the illustrated embodiment with eight blades, the fan can also be equipped with more or fewer blades. Both plastic and metal can be used as the material for the dust extraction device, which depends on the expected stress and the desired service life of the parts of the device. To simplify production, parts of the device can also be produced in one piece as die-cast parts made of metal or as injection-molded parts made of plastic and not - as shown in the exemplary embodiment - as components composed of individual components screwed together.

Figur 4 zeigt die Erfindung in einem zweiten Ausführungsbeispiel, wobei große Teile der Figur 4 mit der Figur 1 übereinstimmen. Zur Bedeutung der im folgenden nicht angesprochenen Bezugsziffern wird deshalb auf den Beschreibungstext zur Figur 1 verwiesen. Die Unterschiede der in den Figuren 1 und 4 dargestellten Ausführungsbeispiele der Erfindung beziehen sich zum einen auf die Anordnung des Ventilators 6 und zum anderen auf die Ausführung des Borstenkranzes 4.FIG. 4 shows the invention in a second exemplary embodiment, large parts of FIG. 4 corresponding to FIG. 1. For the meaning of the reference numbers not mentioned below, reference is therefore made to the description text for FIG. 1. The differences between the exemplary embodiments of the invention shown in FIGS. 1 and 4 relate on the one hand to the arrangement of the fan 6 and on the other hand to the design of the bristle ring 4.

Bei dem in der Figur 4 dargestellten Ausführungsbeispiel ist der Ventilator 6 im Gegensatz zum Ausführungsbeispiel nach Figur 1 auf der Oberseite 53 des Schleiftellers 5 in dem Ringkanal 82 angeordnet. Hierzu ist der Schleifteller 5 an seiner Oberseite 53 mit einer konzentrisch zu seiner Rotationsachse umlaufenden Ringnut 55 versehen, in welche ein mehrere Ventilationsflügel 62' tragender Tragring 61' form- und kraftschlüssig eingesetzt ist. Bei entsprechender, dem einschlägig tätigen Fachmann geläufiger Ausbildung der Ventilationsflügel 62' wird bei Rotation des Schleiftellers 5 durch diese ein starker Luftstrom in dem Ringkanal 82 erzeugt. Hierdurch wird, wie bei der zuerst beschriebenen Ausführung der Erfindung auch, ein starker Luftstrom von der Außenseite der Staubabsaugglocke 2 her durch den Borstenkranz 4 hindurch in den Zwischenraum 81 zwischen Außenseite 52 des Schleiftellers und dem Borstenkranz 4 erzeugt, welcher dann weiter durch den Ringkanal 82 und durch den Einlaß 82' in das Innere 83 des oberen Teils der Glocke 2 gefördert wird. Von dort gelangt der Luftstrom in den Staubableitungskanal 23, wobei infolge der bereits rotierend in axialer Richtung durch der Einlaß 82'in das Innere 83 des oberen Teils der Glocke 2 einströmenden Luftstrom die Staubteilchen im wesentlichen entlang der Innenseite der Wandung 22 der Glocke 2 geführt und in den Staubableitungskanal 23 geleitet werden. Dieser Staubableitungskanal 23 ist bei dem in der Figur 4 dargestellten Ausführungsbeispiel in das Gehäuse 71 des Rotationsschleifgerätes 7 integriert. Hierdurch entfällt ein bei manchen Arbeiten hinderlicher Staubfangsack oder Staubableitungsschlauch im unmittelbaren Arbeitsbereich.In the exemplary embodiment shown in FIG. 4, in contrast to the exemplary embodiment according to FIG. 1, the fan 6 is arranged on the upper side 53 of the grinding plate 5 in the annular channel 82. For this purpose, the grinding plate 5 is provided on its upper side 53 with an annular groove 55 which runs concentrically to its axis of rotation and into which a support ring 61 'carrying several ventilation blades 62' is inserted in a positive and non-positive manner. With a corresponding design of the ventilation blades 62 'which is familiar to the relevant specialist, a strong air flow is generated in the ring channel 82 when the grinding plate 5 rotates. As a result, as in the embodiment of the invention described first, a strong air flow is generated from the outside of the dust extraction bell 2 through the bristle ring 4 into the space 81 between the outside 52 of the grinding plate and the bristle ring 4, which then continues through the annular channel 82 and is conveyed through the inlet 82 'into the interior 83 of the upper part of the bell 2. From there the air flow enters the dust discharge duct 23, the dust particles being guided essentially along the inside of the wall 22 of the bell 2 and due to the air flow already flowing in the axial direction through the inlet 82 ′ into the interior 83 of the upper part of the bell 2 be guided into the dust discharge duct 23. In the exemplary embodiment shown in FIG. 4, this dust discharge duct 23 is integrated in the housing 71 of the rotary grinding device 7. This eliminates the need for a dust bag or dust discharge hose in the immediate work area, which is a hindrance in some work.

Außer wie in dieser Figur4 gezeigt, kann bei der vorliegenden Erfindung auch die Anordnung zweier Ventilatoren vorgesehen sein, was sich auf einfache Weise durch Kombination der Ausführungsbeispiele gemäß Figur 1 und Figur 4 ergibt.In addition to as shown in this FIG. 4, the arrangement of two fans can also be provided in the present invention, which results in a simple manner by combining the exemplary embodiments in accordance with FIG. 1 and FIG. 4.

Ein weiterer Unterschied des Ausführungsbeispiels gemäß Figur 4 zu dem in Figur 1 gezeigten Ausführungsbeispiel besteht in der Ausgestaltung des Borstenkranzes 4, der hier aus zwei vollständig um den Schleifteller 5 umlaufenden, konzentrischen Teilkränzen 41 und 43 gebildet ist. Die beiden Teilkränze 41 und 43 weisen abschnittsweise abwechselnd Partien größerer und kleinerer Länge auf, wobei jeweils ein Abschnitt größerer Länge des einen Kranzes einem Abschnitt kleinerer Länge des anderen Kranzes gegenüberliegt. Hierdurch wird das Einströmen von Luft von außen her in den Zwischenraum 81 zwischen Schleifteller 5 und Borstenkranz 4 wesentlich erleichtert, ohne daß unter der Wirkung von Zentrifugalkräften nach außen fliegende Schleifstaubpartikel den Borstenkranz 4 durchdringen könnten. Durch die so vergrößerte durchströmende Luftmenge wird eine verbesserte Staubabsaugung erreicht. Außer wie in den dargestellten Ausführungsbeispielen gezeigt, kann der Kranz 4 auch aus einem anderen Material als Borsten, wie z. B. elastischem Schaumgummi oder Schaumkunststoff bestehen.A further difference between the exemplary embodiment according to FIG. 4 and the exemplary embodiment shown in FIG. 1 consists in the configuration of the bristle ring 4, which here is formed from two concentric partial rings 41 and 43 which run completely around the grinding plate 5. The two partial rings 41 and 43 alternately have sections of greater and shorter length, with a section of greater length of one ring opposite a section of shorter length of the other ring. As a result, the inflow of air from the outside into the intermediate space 81 between the grinding plate 5 and the bristle ring 4 is made considerably easier, without grinding dust particles flying outwards under the action of centrifugal forces being able to penetrate the bristle ring 4. Due to the increased amount of air flowing through, an improved dust extraction is achieved. Except as shown in the illustrated embodiments, the ring 4 can also be made of a material other than bristles, such as. B. elastic foam or plastic.

Ein drittes und letztes Ausführungsbeispiel der Erfindung ist schließlich in der Figur 5 dargestellt. Bei diesem Ausführungsbeispiel ist vorgesehen, daß in der Staubabsaugglocke 2 ein Sichtfenster 14 in einer eine Beobachtung des Randes 52 des Schleiftellers 5 erlaubenden Position angeordnet ist. Vorteilhaft sind bei diesem Ausführungsbeispiel der Strömungsleitkörper 3, ein das durchsichtige Fenster 14 bildender Flanschring 17 und die Halterungen 42 und 44 der Borstenkränze 41 und 43 als zueinander und zur Rotationsachse des Schleiftellers 5 konzentrische Schraubringe ausgebildet. Der Flanschring 17 ist dabei vorzugsweise aus Plexiglas oder Acrylglas hergestellt und im Bereich oberhalb des Randes 52 des Schleiftellers 5 angeordnet. Mit dem Strömungsleitkörper 3 ist er mittels eines Schraubgewindes 19 lösbar verbunden. Dies ermöglicht einen einfachen Austausch des das Sichtfenster 14 bildenden Flanschringes 17 bei Beschädigung. Die Halterung 44 des inneren Borstenkranzes 43 ist ihrerseits mittels eines Schraubgewindes 18 außenseitig auf den Flanschring 17 und die Halterung 42 des äußeren Borstenkranzes 41 mittels: eines Schraubgewindes 16 außenseitig auf die Halterung 44 aufgeschraubt, d. h. die Halterungen 44 und 42 sind jeweils als Schraubringe 16 und 15 ausgeführt.A third and last exemplary embodiment of the invention is finally shown in FIG. 5. In this exemplary embodiment, it is provided that a viewing window 14 is arranged in the dust extraction bell 2 in a position allowing observation of the edge 52 of the grinding plate 5. In this exemplary embodiment, the flow guide body 3, a flange ring 17 forming the transparent window 14 and the brackets 42 and 44 of the bristle rings 41 and 43 are advantageously designed as screw rings concentric with one another and with the axis of rotation of the grinding plate 5. The flange ring 17 is preferably made of plexiglass or acrylic glass and arranged in the area above the edge 52 of the grinding plate 5. It is detachably connected to the flow guide body 3 by means of a screw thread 19. This enables the flange ring 17 forming the viewing window 14 to be easily replaced if damaged. The holder 44 of the inner bristle ring 43 is in turn screwed onto the flange ring 17 on the outside by means of a screw thread 18 and the holder 42 of the outer bristle ring 41 is screwed onto the holder 44 on the outside by means of a screw thread 16, ie the holders 44 and 42 are each designed as screw rings 16 and 15.

Ein weiteres, in der Figur 5 zu sehendes Erfindungsmerkmal ist die Anordnung von an sich bekannten, durch den Schleifteller 5 sowie die auf dessen Unterseite 51 aufgelegte Schleifmittelscheibe 50 verlaufenden Staubabsaugkanälen 56. Während diese Kanäle 56 beim Stand der Technik in eine Richtung parallel zur Rotationsachse des Schleiftellers 5 verlaufen, sind sie hier gemäß der vorliegenden Erfindung schräg verlaufend ausgeführt. Dabei ist die Neigung der Kanäle 56 so gewählt, daß deren untere Enden 57 in Rotationsrichtung gesehen gegenüber den oberen Enden 58 vorverlegt sind. Dabei münden die oberen Enden 58 der Kanäle 56 in den Zwischenraum 82 zwischen dem Schleifteller 5 und dem Strömungsleitkörper 3. Hierdurch wird erreicht, daß auch der Schleifteller 5 noch eine gewisse Ventilationswirkung erzeugt, wodurch der Wirkungsgrad der Staubabsaugung weiter verbessert werden kann. Zu den weiteren, in der Figur 5 erscheinenden Bezugsziffern wird auf die Beschreibung zu den vorangehenden Figuren 1 bis 4 verwiesen.Another feature of the invention that can be seen in FIG. 5 is the arrangement of dust extraction channels 56 known per se and running through the grinding plate 5 and the abrasive disc 50 placed on its underside 51. While these channels 56 in the prior art in a direction parallel to the axis of rotation of the Grinding plates 5 run, they are executed here obliquely according to the present invention. The inclination of the channels 56 is chosen so that the lower ends 57 are advanced relative to the upper ends 58 when viewed in the direction of rotation. The upper ends 58 of the channels 56 open into the intermediate space 82 between the grinding plate 5 and the flow guide body 3. This ensures that the grinding plate 5 also produces a certain ventilation effect, whereby the efficiency of the dust extraction can be further improved. For the other reference numbers appearing in FIG. 5, reference is made to the description of the preceding FIGS. 1 to 4.

Claims (6)

1. A rotary grinder with a grinding disk (5) mounted on a drive shaft (73) and a dust extractor (1) comprising a bell-shaped dust collector (2) surrounding the rim end and the grinder end of the grinding disk (5) to form an annular chamber (82), connected to a dust extraction duct (23) and provided at its lower rim with a ring (4) made of a flexible, air permeable material such as bristles and projecting slightly beyond the grinding face (51) of the grinding disk (5), characterised in that at least a section (41, 43) of the ring (4) is rotatable about the grinding disk (5).
2. A rotary grinder according to Claim 1, characterised in that the ring (4) is divided into an inner section (43) and an outer section (41) of slightly different radii, the two sections together covering an angle of at least 360°, and in that either section (41, 43) is movable relative to the other in the circumferential direction in a sliding guide (34,35) concentric with the grinding disk.
3. A rotary grinder according to Claim 1 or 2, characterised in that two concentricly rotatable ring sections (41, 43) are provided with circumferentially consecutive segments of greater and lesser length resembling crenellations, a shorter segment of one ring section always being opposed by a longer segment of the other ring section.
4. A rotary grinder according to any of Claims 1 to 3, characterised in that the bell-shaped dust collector (2) has at least one inspection window (14) for observing the rim (52) of the grinding disk (5).
5. A rotary grinder according to Claim 4, characterised in that the inspection window is represented by a flanged ring (17) arranged above the rim (52) of the grinding disk.
6. A rotary grinder according to any of Claims 1 to 5, characterised in that the bell-shaped dust collector (2) is provided with a clamping and tension ring (25) to slip over the neck (72) of the grinder housing (71) for detachable location by quick-acting clamping means (27), an intermediate ring (26) being arranged between the grinder neck (72) and the clamping and tension ring (25) depending on the dimensions of the grinder neck (72).
EP86112837A 1985-09-20 1986-09-17 Rotary grinder with dust extraction-device Expired - Lifetime EP0215476B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86112837T ATE51558T1 (en) 1985-09-20 1986-09-17 ROTARY SANDER WITH DUST EXTRACTOR.

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DE19853533668 DE3533668A1 (en) 1985-09-20 1985-09-20 Dust-extraction device for grinding machines with a rotating grinding plate
DE3533668 1985-09-20
DE3537935 1985-10-25
DE19853537935 DE3537935A1 (en) 1985-09-20 1985-10-25 Improved dust extraction device for grinding apparatuses having a rotating grinding disc
DE3607106 1986-03-05
DE19863607106 DE3607106A1 (en) 1986-03-05 1986-03-05 Dust extraction device for rotary grinding machines
DE19863620562 DE3620562A1 (en) 1986-06-19 1986-06-19 Dust extraction device for rotary grinding machines
DE3620562 1986-06-19

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EP0215476A2 EP0215476A2 (en) 1987-03-25
EP0215476A3 EP0215476A3 (en) 1988-04-06
EP0215476B1 true EP0215476B1 (en) 1990-04-04

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EP86112837A Expired - Lifetime EP0215476B1 (en) 1985-09-20 1986-09-17 Rotary grinder with dust extraction-device

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DE (1) DE3670027D1 (en)

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Also Published As

Publication number Publication date
DE3670027D1 (en) 1990-05-10
EP0215476A2 (en) 1987-03-25
EP0215476A3 (en) 1988-04-06

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