EP0320640A2 - Sanding element for a sanding assembly of a vibration sander - Google Patents

Sanding element for a sanding assembly of a vibration sander Download PDF

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Publication number
EP0320640A2
EP0320640A2 EP88119169A EP88119169A EP0320640A2 EP 0320640 A2 EP0320640 A2 EP 0320640A2 EP 88119169 A EP88119169 A EP 88119169A EP 88119169 A EP88119169 A EP 88119169A EP 0320640 A2 EP0320640 A2 EP 0320640A2
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EP
European Patent Office
Prior art keywords
grinding
element according
grinding element
areas
sanding
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP88119169A
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German (de)
French (fr)
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EP0320640A3 (en
Inventor
Gerd Braasch
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Individual
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Individual
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Priority claimed from DE8716524U external-priority patent/DE8716524U1/de
Application filed by Individual filed Critical Individual
Publication of EP0320640A2 publication Critical patent/EP0320640A2/en
Publication of EP0320640A3 publication Critical patent/EP0320640A3/en
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    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B24D11/008—Finishing manufactured abrasive sheets, e.g. cutting, deforming

Definitions

  • the innovation relates to a grinding element for a grinding body of a vibratory grinding device, which has at least in recessed areas of its working side suction openings for grinding dust extraction by means of an external suction device which can be connected to the grinding body, and which is a sheet of grinding cloth or sanding paper covering the working side and coated on one side with grinding material, which has congruent, openwork areas with the recessed areas of the working side.
  • Grinding bodies with suction openings arranged in recessed areas have the advantage that the recessed areas which are not involved in the grinding work serve to form suction currents which sweep away and remove the grinding dust arising during the grinding work.
  • the raised areas of the working side involved in the sanding work are to be equipped with sanding elements which, after wear, must also be replaceable.
  • a grinding element In order to make it easier to replace grinding elements, it is provided in a grinding element that it is designed as a sheet covering the working side and coated on one side with grinding material, which has congruent, perforated areas with the recessed areas of the working side.
  • each sheet has openwork areas that congruent with the recessed areas of the working side, grinding dust can get through the openwork areas into the recessed areas of the working side of the grinding wheel and be carried away and extracted.
  • the grinding element can e.g. be a known abrasive cloth, which is adaptable in terms of its outer dimensions to the dimensions of the working side of the grinding body by cutting or tearing.
  • the abrasive cloth can also be sheeted with a carrier layer made of e.g. Be plastic fabric.
  • the grinding element can be a known sandpaper.
  • the grinding element can be applied to the grinding wheel by simply placing it on the grinding wheel. Fastening can take place by means of fastening means known per se, for example by clamping or by gluing. It has also already been proposed to use the suction effect of the external suction device in order to hold the sheet-shaped grinding element on the working side by means of the negative pressure generated. This is easily possible during the grinding process with the grinding wheel, in which the suction device is put into operation. However, it has been shown that the adhesion between the grinding element and the grinding body is not sufficient due to the suction effect alone.
  • the adhesion of the grinding element due to the suction effect of the suction device is significantly improved according to the invention in that its back, which is free of grinding material, is provided with a roughening.
  • the roughening increases the static friction and can also be done, for example, by brushing the back with a steel brush already made.
  • the roughening can also be restricted to predetermined surface areas of the rear side.
  • the roughening or the roughened surface areas can also be formed by a layer on the back made of a material with high static friction.
  • a roughened layer can be glued to the back, which consists of an adhesive material application, but also of a glued strip of abrasive material, e.g. Abrasive cloth or sandpaper can exist.
  • a hot glue can be applied in layers on the back, which can be pressed through indentations, e.g. depressions pressed in by means of a needle roller is roughened.
  • the roughening is formed by folding over or bending the edges of the grinding element, as a result of which the roughening effect of the grinding material on the back can be used to improve the adhesion, with the advantage that no special measures have to be taken on the grinding element, to achieve the roughening.
  • the broken areas e.g. the rows of holes, which are already present in the sanding sheet, can be used advantageously as a folding line specification for folding over or folding the edges.
  • the grinding element is characterized in that the folded-over edge serving as a position has at least one hole which is arranged in such a way that, when the blade is placed on the grinding body, it has a recess on the intermediate one Areas of the surface of the work side opening out of the work area of a puncture channel running in the grinding body.
  • the arrangement of at least one hole in the folded edge serving as a roughened layer has the advantage, in particular when using a grinding element made of relatively thin sandpaper, that buckling by slipping of the sandpaper area located above the folded edge during grinding work is prevented, since the suction force is reduced by the hole in the folded edge can affect the sandpaper area above.
  • Each perforated area can be designed as a row of holes, wherein the diameter of the holes can be selected so that it corresponds to the width of a recessed area in which suction openings open.
  • Each perforated area can also be designed as an elongated slot.
  • the distance between two adjacent perforated areas is about 10 to 80 mm, preferably 40 mm. This creates abrasive surfaces between the individual perforated areas, which are sufficiently dimensioned for a correspondingly desired grinding performance and yet are not kept too wide, so that grinding dust which arises can be extracted through the perforated areas as quickly as possible.
  • each folded edge is approximately equal to half the distance between the broken areas.
  • Fig. 1 a view of a grinding wheel and a grinding element removed from its working side is shown.
  • the grinding body consists of a carrier plate 1 made of rubber with projecting web-like studs 2, the upper sides of which form the working side 3 involved in the grinding work. Deepened areas 4 located between the web-like studs 2 are provided with openings 5 of suction lines, which are connected to branch channels 6, which open out on an end face 7 of the grinding wheel.
  • An external suction device can be connected to the stub channels, so that air flowing into the outlets 5 is sucked in and sucked in via the stub channels 6 in the direction of the arrows 8 to the external suction device.
  • branch channels are connected to outlet openings 9, which open out on the upper sides of the web-shaped studs 2.
  • a sheet-shaped grinding element 10 that can be placed on the working side 3 of the web-shaped studs 2, for example a rectangularly cut piece of abrasive cloth, is held by the negative pressure in the area of the outlet openings 9 on the upper sides of the web-shaped studs forming the working side 3.
  • the grinding element 10 has perforated areas designed as a row of holes 11, which are congruent with the recessed areas 4 between the web-shaped studs 2.
  • a perforated area can also be designed as an elongated slot 12 indicated here.
  • the perforated areas 11 or elongated slot 12 lie congruent to the recessed areas 4 between the web-shaped studs 2, so that grinding dust that arises through the holes in the rows of holes 11 or through elongated slot slots 12 the recessed areas 4 can penetrate and is sucked off through the mouths 5.
  • FIG. 2 schematically shows a view of a grinding element 10 with rows of holes 11. Edges 13 and 14 of the grinding element lying opposite one another have been folded over, as shown, with rows of holes in each case specifying the crease line. As a result, lateral regions of the rear side 15 of the grinding element are roughened by the grinding material coating of the folded-over sections.
  • FIG. 3 shows a schematic sectional view through a grinding element 10 on an enlarged scale.
  • the grinding element consists of a carrier layer 16 which is coated on the top with grinding material 17.
  • a roughened layer 18 is attached to the back, e.g. can be formed from an applied hot glue, which is roughened by indentations.
  • FIG. 4 shows a detail from FIG. 3 on an even larger scale.
  • Fig. 4 shows that e.g. A roughening is formed by means of needles 19 pressed into the position 18 on needles on needle rollers, because protruding edge beads 20 are formed by the material displacement when the needles penetrate.
  • FIG. 5 shows a view of the grinding element 10 on the rear side 15.
  • the same parts are identified by the same reference numbers.
  • a hole 21 is punched in each folded edge 13, 14 which, when placed on a grinding wheel according to FIG. 1, is congruent with an outlet opening 9.
  • This has the advantage that the adhesive suction force can have an effect through the hole 21 in the direction of the arrow 22 (FIG. 6), so that in particular thin sandpaper loses its tendency to bulge in the areas opposite the folded edge 13, 14.

Abstract

A sanding assembly of a vibration sander has suction openings, arranged at least in recessed areas of its working side, for extracting sanding dust by means of an external extraction device which can be attached to the sanding assembly. A sheet of abrasive cloth or abrasive paper, covering the working side and coated on one side with abrasive material, is provided as the sanding element, which has pierced areas congruent with the recessed areas of the working side. So that the sanding element can adhere to the working side solely by suction force in order to thereby ensure simple and quick exchange of worn sanding elements, the rear side of the sanding element, which rear side is free of abrasive material, is provided with a roughened portion. For the purpose of creating the roughened portion, at least two sheet edges facing one another are preferably folded back. <IMAGE>

Description

Die Neuerung betrifft ein Schleifelement für einen Schleifkör­per eines Vibrationsschleifgerätes, der zumindest in vertief­ten Bereichen seiner Arbeitsseite angeordnete Absaugöffnungen zur Schleifstaubabsaugung mittels einer an den Schleifkörper anschließbaren externen Absaugeinrichtung hat, und das ein die Arbeitsseite abdeckendes, einseitig mit Schleifmaterial be­schichtetes Blatt Schleifleinen bzw. Schleifpapier ist, wel­ches mit den vertieften Bereichen der Arbeitsseite kongruente, durchbrochene Bereiche aufweist.The innovation relates to a grinding element for a grinding body of a vibratory grinding device, which has at least in recessed areas of its working side suction openings for grinding dust extraction by means of an external suction device which can be connected to the grinding body, and which is a sheet of grinding cloth or sanding paper covering the working side and coated on one side with grinding material, which has congruent, openwork areas with the recessed areas of the working side.

Schleifkörper mit in vertieften Bereichen angeordneten Absaug­öffnungen haben den Vorteil, daß die an der Schleifarbeit nicht beteiligten vertieften Bereiche zur Ausbildung von Saug­strömungen dienen, die bei der Schleifarbeit anfallenden Schleifstaub mitreißen und abführen. Die erhöhten, an der Schleifarbeit beteiligten Bereiche der Arbeitsseite sind mit Schleifelementen auszurüsten, die, nach einer Abnutzung, auch ersetzbar sein müssen.Grinding bodies with suction openings arranged in recessed areas have the advantage that the recessed areas which are not involved in the grinding work serve to form suction currents which sweep away and remove the grinding dust arising during the grinding work. The raised areas of the working side involved in the sanding work are to be equipped with sanding elements which, after wear, must also be replaceable.

Um eine vereinfachte Auswechselung von Schleifelementen zu er­möglichen, ist bei einem Schleifelement vorgesehen, daß es als die Arbeitsseite abdeckendes, einseitig mit Schleifmaterial be­schichtetes Blatt ausgebildet ist, welches mit den vertieften Bereichen der Arbeitsseite kongruente, durchbrochene Bereiche aufweist.In order to make it easier to replace grinding elements, it is provided in a grinding element that it is designed as a sheet covering the working side and coated on one side with grinding material, which has congruent, perforated areas with the recessed areas of the working side.

Mit einem solchen als Blatt ausgebildeten Schleifelement läßt sich die gesamte Arbeitsseite des Schleifkörpers in einem Ar­beitsgang abdecken. Ebenso läßt sich ein abgenutztes Schleif­element als gesamte Einheit in einem Arbeitsgang abnehmen. Das Auswechseln von Schleifelementen ist dadurch vereinfacht. Da jedes Blatt durchbrochene Bereiche aufweist, die mit den ver­tieften Bereichen der Arbeitsseite kongruieren, kann Schleif­staub durch die durchbrochenen Bereiche in die vertieften Be­reiche der Arbeitsseite des Schleifkörpers gelangen und mitge­rissen und abgesaugt werden.With such a grinding element designed as a blade, the entire working side of the grinding body can be covered in one operation. A worn grinding element can also be removed as an entire unit in one operation. This simplifies the replacement of grinding elements. Since each sheet has openwork areas that congruent with the recessed areas of the working side, grinding dust can get through the openwork areas into the recessed areas of the working side of the grinding wheel and be carried away and extracted.

Das Schleifelement kann z.B. ein an sich bekanntes Schleiflei­nen sein, das hinsichtlich seiner äußeren Abmessungen an die Abmessungen der Arbeitsseite des Schleifkörpers durch Zuschnei­den oder Abreißen anpassbar ist. Das Schleifleinen kann auch als Blattware mit einer Trägerlage aus z.B. Kunststoffgewebe ausgebildet sein. Ebenso kann das Schleifelement ein an sich bekanntes Schleifpapier sein.The grinding element can e.g. be a known abrasive cloth, which is adaptable in terms of its outer dimensions to the dimensions of the working side of the grinding body by cutting or tearing. The abrasive cloth can also be sheeted with a carrier layer made of e.g. Be plastic fabric. Likewise, the grinding element can be a known sandpaper.

Durch einfaches Auflegen kann das Schleifelement auf den Schleifkörper aufgebracht werden. Eine Befestigung kann durch an sich bekannte Befestigungsmittel, beispielsweise durch Klem­men oder durch Kleben, erfolgen. Es ist auch bereits vorge­schlagen worden, die Saugwirkung der externen Absaugeinrich­tung zu benutzen, um durch erzeugten Unterdruck das blattförmi­ge Schleifelement an der Arbeitsseite zu halten. Dies ist wäh­rend des Schleifvorganges mit dem Schleifkörper, bei dem die Absaugeinrichtung in Betrieb gesetzt ist, ohne weiteres mög­lich. Es hat sich jedoch gezeigt, daß die Haftung zwischen Schleifelement und Schleifkörper allein aufgrund der Saugwir­kung nicht ausreicht.The grinding element can be applied to the grinding wheel by simply placing it on the grinding wheel. Fastening can take place by means of fastening means known per se, for example by clamping or by gluing. It has also already been proposed to use the suction effect of the external suction device in order to hold the sheet-shaped grinding element on the working side by means of the negative pressure generated. This is easily possible during the grinding process with the grinding wheel, in which the suction device is put into operation. However, it has been shown that the adhesion between the grinding element and the grinding body is not sufficient due to the suction effect alone.

Die Haftung des Schleifelementes durch die Saugwirkung der Ab­saugeinrichtung wird gemäß der Erfindung wesentlich dadurch verbessert, daß seine schleifmaterialfreie Rückseite mit einer Aufrauhung versehen ist. Die Aufrauhung erhöht die Haftreibung und kann z.B. auch durch Bürsten der Rückseite mit einer Stahl­ bürste bereits hergestellt werden.The adhesion of the grinding element due to the suction effect of the suction device is significantly improved according to the invention in that its back, which is free of grinding material, is provided with a roughening. The roughening increases the static friction and can also be done, for example, by brushing the back with a steel brush already made.

Bei entsprechender Aufrauhung und dadurch bewirkter höherer Haftreibung, kann die Aufrauhung auch auf vorbestimmte Flächen­bereiche der Rückseite beschränkt werden.With a corresponding roughening and thereby higher static friction, the roughening can also be restricted to predetermined surface areas of the rear side.

Die Aufrauhung bzw. die aufgerauhten Flächenbereiche können auch durch eine an der Rückseite angebrachte Lage aus einem Werkstoff mit hoher Haftreibung gebildet sein. So kann z.B. an die Rückseite eine aufrauhende Lage geklebt sein, die aus ei­nem Klebmaterialauftrag besteht, aber auch aus einem aufgekleb­ten Streifen Schleifmaterial, z.B. Schleifleinen oder Schleif­papier, bestehen kann. So kann ein Heißkleber auf die Rücksei­te schichtartig aufgetragen sein, der vor dem Aushärten durch eingedrückte Vertiefungen, z.B. mittels einer Nadelwalze einge­drückte Vertiefungen, aufgerauht wird.The roughening or the roughened surface areas can also be formed by a layer on the back made of a material with high static friction. For example, a roughened layer can be glued to the back, which consists of an adhesive material application, but also of a glued strip of abrasive material, e.g. Abrasive cloth or sandpaper can exist. For example, a hot glue can be applied in layers on the back, which can be pressed through indentations, e.g. depressions pressed in by means of a needle roller is roughened.

Bei einer erfindungswesentlichen Ausgestaltung ist die Aufrau­hung jedoch durch Umklappen bzw. Umknicken der Kanten des Schleifelementes gebildet, wodurch die aufrauhende Wirkung des Schleifmaterials an der Rückseite zur Verbesserung der Haftung genutzt werden kann, mit dem Vorteil, daß keine besonderen Maß­nahmen am Schleifelement vorgenommen werden müssen, um die Auf­rauhung zu erreichen.In an embodiment essential to the invention, however, the roughening is formed by folding over or bending the edges of the grinding element, as a result of which the roughening effect of the grinding material on the back can be used to improve the adhesion, with the advantage that no special measures have to be taken on the grinding element, to achieve the roughening.

Da die durchbrochenen Bereiche, z.B. die Lochreihen, im Schleifblatt bereits vorhanden sind, können diese als Knickli­nienvorgabe für das Umklappen bzw. Umknicken der Kanten in vor­teilhafter Weise genutzt werden.Since the broken areas, e.g. the rows of holes, which are already present in the sanding sheet, can be used advantageously as a folding line specification for folding over or folding the edges.

Es ist jedoch auch möglich, durch beliebige andere Markierun­gen an dem Schleifblatt die Knicklinien vorzugeben.However, it is also possible to specify the crease lines by any other markings on the sanding sheet.

Weiterhin zeichnet sich das Schleifelement dadurch aus, daß die als Lage dienende umgeklappte Kante wenigstens ein Loch aufweist, welches derart angeordnet ist, daß es bei am Schleif­körper angelegtem Blatt mit einer an der zwischen vertieften Bereichen befindlichen Oberfläche der Arbeitsseite ausmünden­den Austrittsöffnung eines im Schleifkörper verlaufenden Stich­kanals kongruiert. Die Anordnung wenigstens eines Loches in der als aufgerauhte Lage dienenden umgeklappten Kante hat ins­besondere bei der Verwendung eines Schleifelementes aus rela­tiv dünnem Schleifpapier den Vorteil, daß eine Beulenbildung durch Verrutschen des über der umgeklappten Kante befindlichen Schleifpapierbereiches während der Schleifarbeiten verhindert wird, da sich die Saugkraft durch das Loch in der umgeklappten Kante auf den darüber befindlichen Schleifpapierbereich auswir­ken kann.Furthermore, the grinding element is characterized in that the folded-over edge serving as a position has at least one hole which is arranged in such a way that, when the blade is placed on the grinding body, it has a recess on the intermediate one Areas of the surface of the work side opening out of the work area of a puncture channel running in the grinding body. The arrangement of at least one hole in the folded edge serving as a roughened layer has the advantage, in particular when using a grinding element made of relatively thin sandpaper, that buckling by slipping of the sandpaper area located above the folded edge during grinding work is prevented, since the suction force is reduced by the hole in the folded edge can affect the sandpaper area above.

Jeder durchbrochene Bereich kann als Lochreihe ausgebildet sein, wobei der Durchmesser der Löcher so gewählt werden kann, daß er der Breite eines vertieften Bereiches, in welchem An­saugöffnungen ausmünden, entspricht.Each perforated area can be designed as a row of holes, wherein the diameter of the holes can be selected so that it corresponds to the width of a recessed area in which suction openings open.

Jeder durchbrochene Bereich kann auch als Langlochschlitz aus­gebildet sein.Each perforated area can also be designed as an elongated slot.

Der Abstand zwischen zwei zueinander benachbarten durchbroche­nen Bereichen beträgt etwa 10 bis 80 mm, vorzugsweise 40 mm. Dadurch entstehen zwischen den einzelnen durchbrochenen Berei­chen schleifende Flächen, die für eine entsprechend gewünschte Schleifleistung ausreichend bemessen sind und dennoch nicht zu breit gehalten werden, damit entstehender Schleifstaub mög­lichst schnell durch die durchbrochenen Bereiche abgesaugt wer­den kann.The distance between two adjacent perforated areas is about 10 to 80 mm, preferably 40 mm. This creates abrasive surfaces between the individual perforated areas, which are sufficiently dimensioned for a correspondingly desired grinding performance and yet are not kept too wide, so that grinding dust which arises can be extracted through the perforated areas as quickly as possible.

Dabei ist die Breite jeder umgeklappten Kante etwa gleich dem halben Abstand zwischen den durchbrochenen Bereichen.The width of each folded edge is approximately equal to half the distance between the broken areas.

Ausführungsbeispiele sind in der Zeichnung dargestellt. Es zei­gen:

  • Fig. 1 eine Ansicht eines Schleifkörpers sowie eines von sei­ner Arbeitsseite abgenommenen Schleifelementes,
  • Fig. 2 eine schematische Ansicht eines Schleifelementes mit umgeklappten Seitenkanten,
  • Fig. 3 eine Schnittansicht eines Teils des Schleifelementes mit einer aufrauhenden Lage an der Rückseite in vergrö­ßerndem Maßstab,
  • Fig. 4 eine Schnittansicht eines Schleifelementes nach Fig. 3 in noch weiter vergrößerndem Maßstab,
  • Fig. 5 eine Ansicht eines Schleifelementes auf seine Rückseite und
  • Fig. 6 eine schematische Schnittansicht einer umgeklappten Kante des Schleifelementes gemäß Fig. 4 in vergrößern­dem Maßstab.
Exemplary embodiments are shown in the drawing. Show it:
  • 1 is a view of a grinding wheel and a grinding element removed from its working side,
  • Fig. 2 is a schematic view of a grinding element folded side edges,
  • 3 is a sectional view of a part of the grinding element with a roughened layer on the back on an enlarged scale,
  • FIG. 4 shows a sectional view of a grinding element according to FIG. 3 on an even larger scale, FIG.
  • Fig. 5 is a view of a grinding element on its back and
  • Fig. 6 is a schematic sectional view of a folded edge of the grinding element according to FIG. 4 on an enlarged scale.

In Fig. 1 ist eine Ansicht eines Schleifkörpers sowie eines von seiner Arbeitsseite abgenommenen Schleifelementes darge­stellt. Der Schleifkörper besteht aus einer aus Gummi gefertig­ten Trägerplatte 1 mit vorstehenden stegartigen Stollen 2, de­ren Oberseiten die an der Schleifarbeit beteiligte Arbeitssei­te 3 bilden. Zwischen den stegartigen Stollen 2 befindliche vertiefte Bereiche 4 sind mit Ausmündungen 5 von Absaugleitun­gen versehen, die mit Stichkanälen 6 in Verbindung stehen, wel­che an einer Stirnseite 7 des Schleifkörpers ausmünden. An die Stichkanäle ist eine hier nicht weiter dargestellte externe Ab­saugeinrichtung anschließbar, so daß in die Ausmündungen 5 ein­strömende Luft angesaugt und über die Stichkanäle 6 in Rich­tung der Pfeile 8 zur externen Absaugeinrichtung gesaugt wird. Einige der Stichkanäle sind mit Austrittsöffnungen 9 verbun­den, die an den Oberseiten der stegförmigen Stollen 2 ausmün­den. Ein auf die Arbeitsseite 3 der stegförmigen Stollen 2 auf­legbares blattförmiges Schleifelement 10, beispielsweise ein rechteckig zugeschnittenes Stück Schleifleinen, wird durch den Unterdruck im Bereich der Austrittsöffnungen 9 auf den die Ar­beitsseite 3 bildenden Oberseiten der stegförmigen Stollen festgehalten.In Fig. 1 a view of a grinding wheel and a grinding element removed from its working side is shown. The grinding body consists of a carrier plate 1 made of rubber with projecting web-like studs 2, the upper sides of which form the working side 3 involved in the grinding work. Deepened areas 4 located between the web-like studs 2 are provided with openings 5 of suction lines, which are connected to branch channels 6, which open out on an end face 7 of the grinding wheel. An external suction device, not shown here, can be connected to the stub channels, so that air flowing into the outlets 5 is sucked in and sucked in via the stub channels 6 in the direction of the arrows 8 to the external suction device. Some of the branch channels are connected to outlet openings 9, which open out on the upper sides of the web-shaped studs 2. A sheet-shaped grinding element 10 that can be placed on the working side 3 of the web-shaped studs 2, for example a rectangularly cut piece of abrasive cloth, is held by the negative pressure in the area of the outlet openings 9 on the upper sides of the web-shaped studs forming the working side 3.

Das Schleifelement 10 weist als Lochreihe 11 ausgebildete durchbrochene Bereiche auf, die mit den vertieften Bereichen 4 zwischen den stegförmigen Stollen 2 kongruent sind.The grinding element 10 has perforated areas designed as a row of holes 11, which are congruent with the recessed areas 4 between the web-shaped studs 2.

Ein durchbrochener Bereich kann auch als hier angedeuteter Langlochschlitz 12 ausgebildet sein.A perforated area can also be designed as an elongated slot 12 indicated here.

Bei auf die Arbeitsseite 3 des Schleifkörpers 1 gelegtem Schleifelement 10 liegen die durchbrochenen Bereiche 11 bzw. Langlochschlitz 12 kongruent zu den vertieften Bereichen 4 zwi­schen den stegförmigen Stollen 2, so daß entstehender Schleif­staub durch die Löcher der Lochreihen 11, bzw. durch Langloch­schlitze 12, in die vertieften Bereiche 4 eindringen kann und über die Ausmündungen 5 abgesaugt wird.When the grinding element 10 is placed on the working side 3 of the grinding body 1, the perforated areas 11 or elongated slot 12 lie congruent to the recessed areas 4 between the web-shaped studs 2, so that grinding dust that arises through the holes in the rows of holes 11 or through elongated slot slots 12 the recessed areas 4 can penetrate and is sucked off through the mouths 5.

Fig. 2 zeigt schematisch eine Ansicht eines Schleifelementes 10 mit Lochreihen 11. Einander gegenüberliegende Kanten 13 und 14 des Schleifelementes sind, wie dargestellt, umgeklappt, wo­bei jeweils äußere Lochreihen die Knicklinie vorgegeben haben. Dadurch sind seitliche Bereiche der Rückseite 15 des Schleif­elementes durch die Schleifmaterialbeschichtung der umgeklapp­ten Abschnitte aufgerauht.2 schematically shows a view of a grinding element 10 with rows of holes 11. Edges 13 and 14 of the grinding element lying opposite one another have been folded over, as shown, with rows of holes in each case specifying the crease line. As a result, lateral regions of the rear side 15 of the grinding element are roughened by the grinding material coating of the folded-over sections.

Fig. 3 zeigt eine schematische Schnittansicht durch ein Schleifelement 10 in vergrößerndem Maßstab. Das Schleifelement besteht aus einer Trägerlage 16, die an der Oberseite mit Schleifmaterial 17 beschichtet ist. An der Rückseite ist eine aufrauhende Lage 18 angebracht, die z.B. aus einem aufgetrage­nen Heißkleber gebildet sein kann, der durch Eindrückungen auf­gerauht wird.FIG. 3 shows a schematic sectional view through a grinding element 10 on an enlarged scale. The grinding element consists of a carrier layer 16 which is coated on the top with grinding material 17. A roughened layer 18 is attached to the back, e.g. can be formed from an applied hot glue, which is roughened by indentations.

In Fig. 4 ist eine Einzelheit aus Fig. 3 in noch weiter vergrö­ßerndem Maßstab dargestellt. Fig. 4 läßt erkennen, daß eine z.B. mittels an Nadelwalzen sitzenden Nadeln in die Lage 18 eingedrückte Vertiefung 19 eine Aufrauhung bildet, weil durch die Materialverdrängung beim Eindringen der Nadeln vorstehende Randwülste 20 gebildet werden.FIG. 4 shows a detail from FIG. 3 on an even larger scale. Fig. 4 shows that e.g. A roughening is formed by means of needles 19 pressed into the position 18 on needles on needle rollers, because protruding edge beads 20 are formed by the material displacement when the needles penetrate.

Fig. 5 zeigt eine Ansicht des Schleifelementes 10 auf die Rück­seite 15. Gleiche Teile sind mit gleichen Bezugszahlen bezeich­net. In jede umgeklappte Kante 13,14 ist ein Loch 21 gestanzt, welches bei auf einen Schleifkörper gemäß Fig. 1 gelegtem Schleifelement mit einer Austrittsöffnung 9 kongruiert. Daraus ergibt sich der Vorteil, daß sich die haftende Saugkraft durch das Loch 21 in Richtung des Pfeiles 22 (Fig. 6) auswirken kann, so daß insbesondere dünnes Schleifpapier seine Beulnei­gung in den Bereichen, die der umgeklappten Kante 13,14 gegen­überliegen, verliert.5 shows a view of the grinding element 10 on the rear side 15. The same parts are identified by the same reference numbers. A hole 21 is punched in each folded edge 13, 14 which, when placed on a grinding wheel according to FIG. 1, is congruent with an outlet opening 9. This has the advantage that the adhesive suction force can have an effect through the hole 21 in the direction of the arrow 22 (FIG. 6), so that in particular thin sandpaper loses its tendency to bulge in the areas opposite the folded edge 13, 14.

Claims (13)

1. Schleifelement für einen Schleifkörper eines Vibrationsschleif­gerätes, der zumindest in vertieften Bereichen seiner Arbeits­seite angeordnete Absaugöffnungen zur Schleifstaubabsaugung mittels einer an den Schleifkörper anschließbaren externen Ab­saugeinrichtung hat, und das ein die Arbeitsseite abdeckendes, einseitig mit Schleifmaterial beschichtetes Blatt Schleiflei­nen bzw. Schleifpapier ist, welches mit den vertieften Berei­chen der Arbeitsseite kongruente, durchbrochene Bereiche auf­weist, dadurch gekennzeichnet,
daß seine schleifmaterialfreie Rückseite (15) mit einer Aufrau­hung versehen ist.1.Grinding element for a grinding body of a vibratory grinding device, which has suction openings arranged at least in recessed areas of its working side for grinding dust extraction by means of an external suction device which can be connected to the grinding body, and which is a sheet of sanding cloth or sanding paper which covers the working side and is coated on one side with grinding material has congruent, openwork areas in the recessed areas of the working side, characterized in that
that its backing material-free back (15) is provided with a roughening. 2. Schleifelement nach Anspruch 1, dadurch gekennzeichnet, daß die Aufrauhung in vorbestimmten Flächenbereichen angebracht ist.2. Grinding element according to claim 1, characterized in that the roughening is applied in predetermined surface areas. 3. Schleifelement nach einem der Ansprüche 1 und 2, dadurch ge­kennzeichnet, daß die Aufrauhung eine an der Rückseite ange­brachte Lage (18) ist.3. Grinding element according to one of claims 1 and 2, characterized in that the roughening is an attached to the back layer (18). 4. Schleifelement nach Anspruch 3, dadurch gekennzeichnet, daß jede Lage (18) eine umgeklappte Kante (13,14) ist.4. Grinding element according to claim 3, characterized in that each layer (18) is a folded edge (13, 14). 5. Schleifelement nach Anspruch 1 und 3, dadurch gekennzeichnet, daß wenigstens zwei einander gegenüberliegende Kanten (13,14) des Blattes umgeklappt sind.5. Grinding element according to claim 1 and 3, characterized in that at least two mutually opposite edges (13, 14) of the sheet are folded down. 6. Schleifelement nach den Ansprüchen 4 und/oder 5, dadurch ge­kennzeichnet, daß die Knicklinie jeder umgeklappten Kante (13, 14) durch eine an dem Blatt angebrachte Markierung vorgegeben ist.6. Grinding element according to claims 4 and / or 5, characterized in that the fold line of each folded edge (13, 14) is predetermined by a mark made on the sheet. 7. Schleifelement nach einem der vorhergehenden Ansprüche, da­durch gekennzeichnet, daß die Knicklinie der umgeklappten Kan­ten (13,14) durch einen zugeordneten durchbrochenen Bereich vorgegeben ist.7. Grinding element according to one of the preceding claims, characterized in that the fold line of the folded edges (13, 14) is predetermined by an assigned openwork area. 8. Schleifelement nach einem der Ansprüche 4 bis 7, dadurch ge­kennzeichnet, daß die als Lage (18) dienende umgeklappte Kante 3,14) wenigstens ein Loch aufweist, welches derart angeord­net ist, daß es bei am Schleifkörper angelegtem Blatt mit ei­ner an der zwischen vertieften Bereichen (4) befindlichen Ober­fläche der Arbeitsseite (3) ausmündenden Austrittsöffnung (9) eines im Schleifkörper verlaufenden Stichkanals (6) kongru­iert.8. Grinding element according to one of claims 4 to 7, characterized in that the fold (3,14) serving as a layer (18) has at least one hole which is arranged such that it is in contact with the blade on the grinding wheel with one between recessed areas (4) of the surface of the working side (3) opening out of the outlet opening (9) of a stitch channel (6) running in the grinding wheel. 9. Schleifelement nach einem der vorhergehenden Ansprüche, da­durch gekennzeichnet, daß jeder durchbrochene Bereich als Loch­reihe (11) ausgebildet ist.9. Grinding element according to one of the preceding claims, characterized in that each perforated area is designed as a row of holes (11). 10. Schleifelement nach einem der Ansprüche 1 bis 7, dadurch ge­kennzeichnet, daß jeder durchbrochene Bereich als Langloch­schlitz (12) ausgebildet ist.10. Grinding element according to one of claims 1 to 7, characterized in that each perforated area is designed as an elongated slot (12). 11. Schleifelement nach einem der vorhergehenden Ansprüche, da­durch gekennzeichnet, daß der Abstand zwischen zwei zueinander benachbarten durchbrochenen Bereichen (11,12) etwa 10 bis 80 mm ist.11. Grinding element according to one of the preceding claims, characterized in that the distance between two mutually adjacent perforated areas (11, 12) is approximately 10 to 80 mm. 12. Schleifelement nach Anspruch 11, dadurch gekennzeichnet, daß der Abstand zwischen zwei zueinander benachbarten durchbroche­nen Bereichen (11,12) etwa 40 mm ist.12. Grinding element according to claim 11, characterized in that the distance between two mutually adjacent perforated areas (11, 12) is approximately 40 mm. 13. Schleifelement nach einem der vorhergehenden Ansprüche, da­durch gekennzeichnet, daß die Breite jeder umgeklappten Kante (13,14) etwa gleich dem halben Abstand zwischen den durchbro­chenen Bereichen (11,12) ist.13. Grinding element according to one of the preceding claims, characterized in that the width of each folded edge (13, 14) is approximately equal to half the distance between the perforated areas (11, 12).
EP19880119169 1987-12-15 1988-11-18 Sanding element for a sanding assembly of a vibration sander Withdrawn EP0320640A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE8716524U DE8716524U1 (en) 1987-12-15 1987-12-15
DE8716524U 1987-12-15
DE8802927U 1988-03-04
DE8802927U DE8802927U1 (en) 1987-12-15 1988-03-04

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EP0320640A2 true EP0320640A2 (en) 1989-06-21
EP0320640A3 EP0320640A3 (en) 1990-10-03

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US (1) US4964245A (en)
EP (1) EP0320640A3 (en)
JP (1) JPH01246079A (en)
DE (1) DE8802927U1 (en)
DK (1) DK695588A (en)
IL (1) IL88679A0 (en)

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Also Published As

Publication number Publication date
EP0320640A3 (en) 1990-10-03
IL88679A0 (en) 1989-07-31
JPH01246079A (en) 1989-10-02
US4964245A (en) 1990-10-23
DE8802927U1 (en) 1988-05-05
DK695588D0 (en) 1988-12-14
DK695588A (en) 1989-06-16

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