EP3013521B1 - Holding device for a grinding means - Google Patents

Description

State of the art

In conventional abrasives and grinders, abrasive grits of the grinder and suction holes of the fixture must be registered in an alignment step during assembly to allow for optimal extraction of sanding dust during a grinding operation. Furthermore, a holding device, in particular a grinding plate, has already been provided for an abrasive article, with at least one support body comprising at least one material recess, which is provided for transverse transport of grinding dust on a side facing the abrasive article in a plane parallel to a grinding surface, and with at least a fastening layer for fixing the abrasive proposed on the support body. Abrasive dust is transported in this holding device through a dust-permeable Velcro layer, whereby an alignment step in a mounting of the abrasive on the holding device can be omitted, but a risk of clogging of pores of the dust-permeable Velcro layer, for example, when grinding resinous materials exists.

Disclosure of the invention

The invention relates to a holding device, in particular a sanding pad, for an abrasive, with at least one support body comprising at least one Materialausnehmung, which is provided for a transverse transport of sanding dust on a side facing the abrasive in a plane parallel to a grinding surface, and with at least one attachment layer for attaching the abrasive to the support body, wherein the at least one material recess in a state decoupled from the abrasive material is at least substantially exposed on a side facing the abrasive article and is substantially delimited by the support body on a side facing away from the abrasive article.

Such a holding device is for example from the WO 2009/088772 A2 known. A "holding device for an abrasive" is to be understood in particular as an apparatus which is used to attach an abrasive and preferably to produce an operative bond of the abrasive with a grinding machine tool, in particular a grinding hand tool, for example to produce a motor-driven rotation of the abrasive around a rotation axis, is provided. In particular, the holding device comprises a surface on which an attachment of an abrasive, in particular a flexible abrasive such as a velor-coated grinding wheel, is provided. An "abrasive" is to be understood in particular as a means having at least one layer of abrasive grains, which is intended to process a surface in a grinding process and to achieve a material removal on the surface. In particular, the abrasive comprises at least one abrasive pad and at least one layer of abrasive grains deposited on the at least one abrasive pad secured to the abrasive pad by at least one fastener, in particular at least one adhesive attachment layer. Preferably, the layer of abrasive grains is loosely fixed to at least one layer of a base binder on a surface of the abrasive substrate and fixedly secured by means of at least one layer of a cap binder. An "abrasive substrate" is to be understood in particular as meaning a body made of a carrier material, for example a band or a disk of a paper material, a cardboard material, a textile material, in particular a suede material, a film, a foam, a plastic and / or a metal. In particular, the abrasive backing may include multiple layers of the same or different backing materials. The abrasive pad is preferably formed band or disc-shaped, but in principle, other shapes, such as frustoconical or hexagonal shapes are possible. Preferably, the abrasive is formed as a flexible abrasive. A "flexible abrasive" is to be understood in particular as meaning an abrasive which has a flexible abrasive backing, for example a suede layer, a textile fabric and / or a paper layer on which the at least one layer of abrasive grains is applied. In particular, the flexible abrasive is intended to at least partially conform to a surface shape adapt. An "abrasive grain" is to be understood as meaning in particular a preferably ceramic, crystalline and / or metallic body having at least one abrasive edge. Depending on a desired application and a desired degree of fineness, the abrasive grains have a diameter between ten mm and one-half micron. A layer of abrasive grains may, in principle, comprise abrasive grains having a defined geometry and / or abrasive grains having an undefined geometry. By "abrasive grains having a defined geometry" is meant, in particular, abrasive grains which have at least substantially identical and at least substantially predetermined shapes, for example a rod or tetrahedral shape. In particular, abrasive grains having a defined geometry have been produced by a process that selectively produces abrasive grains having the at least substantially predetermined shape. By an "at least substantially identical form" is to be understood in particular that the abrasive grains have an identical shape and preferably an identical size except for production-related deviations. By "abrasive grains having an undefined geometry" is meant in particular abrasive grains having a number of at least substantially different and at least substantially random shapes. A "support body" is to be understood in particular a body which provides at least one contact surface for the abrasive and which preferably consists at least partially of a flexible material, in particular a foam. Preferably, the support body made of flexible material is provided to elastically adapt to a surface shape of a surface to be abraded. The at least one material recess is designed essentially as a superficial material recess, for example as a channel or as a notch, wherein the material recess may have one or more hole elements through which sanding dust is removed or is connected thereto. The perforated elements have a surface which corresponds to a maximum of ten percent, advantageously not more than five percent and preferably not more than one percent of a surface of the at least one material recess. In particular, the at least one material recess is different from a material breakdown, which extends from a side facing the abrasive to a side facing away from the abrasive of the support body. In particular, the at least one material recess is different from a material breakthrough, which extends from a side of the support body facing the abrasive to a side of the support body facing away from the abrasive. Under a "cross-transport" is in particular a transport of sanding dust within an at least partially area enclosed by the supporting body, in particular within the supporting body, in which the grinding dust is transported at least partially within a plane of the supporting body, in particular in a plane parallel to a grinding surface, in order to move from a passage point of the grinding dust through the grinding means, in particular one Abrasive hole, to a connection hole, which connects a abrasive-side surface of the support body with a surface facing away from abrasive, to get. In particular, the transverse transport is different from a movement of grinding dust in a plane of the support body within abrasive holes and / or suction holes and a transport of grinding dust within a transversely through the support body extending transport channel which connects a schleifmittelseitiges end and a schleifmittelabgewandtes end of a connection hole. A "grinding surface" is to be understood in particular as meaning a surface on which material is removed by grinding in one operation. In particular, an abrasive surface is formed by a contact surface of an abrasive grain layer and a workpiece surface. A "fastening layer" is to be understood, in particular, as meaning a layer with fastening means for fastening the abrasive to the holding device, for example a layer of a hook and loop material. By a "decoupled from the abrasive state" should be understood in particular a state in which the holding device completely assembled, in particular the attachment layer mounted on the support body, and preferably the holding device mounted on a grinding machine tool, and the holding device, in particular the attachment layer, unconnected with an abrasive. A "side facing the abrasive material of the at least one material recess" is intended in particular to be understood as meaning a side which, in a state coupled to the abrasive, faces the abrasive. A "side facing away from the abrasive material of the at least one material recess" should in particular be understood to mean a side which, in the state coupled to the abrasive, faces away from the abrasive. In particular, the side facing the abrasive and the side facing away from the abrasive can be distinguished in the state decoupled from the abrasive by the fact that the attachment layer is arranged on the side facing the abrasive. By "at least substantially open" is to be understood in particular that at least fifty percent, advantageously at least seventy percent and preferably at least ninety percent of a surface of the at least one material recess in the decoupled from the abrasive state is uncovered by the at least one attachment layer. In particular, an area of at least a material recess in the decoupled from the abrasive state completely uncovered by the attachment layer. In particular, the surface of the at least one material recess in the state decoupled from the abrasive is uncovered by the attachment layer and covered by the abrasive in the state coupled to the abrasive. Furthermore, by "at least substantially open" in the case of several material recesses, it should be understood in particular that at least fifty percent, advantageously at least seventy percent and preferably at least ninety percent, of a total area of the plurality of material recesses in the state decoupled from the abrasive is uncovered by the at least one attachment layer. By the fact that the at least one material recess is "bounded on a side facing away from the abrasive substantially by the support body," should be understood in particular that the material recess on the side facing away from the abrasive except for individual hole elements, a maximum of ten percent, Advantageous maximum of an area of five percent, and preferably a maximum of an area of two percent of the material recess, which is projected onto the side facing away from the abrasive of the support body is limited by the support body. In particular, the individual perforated elements are formed by connecting holes to a side facing away from the abrasive of the support body, which are intended to fluidly connect the at least one material recess with a suction device to a suction of grinding dust, so that transversely transported sanding dust is sucked. In particular, material recesses, which are bounded on a side facing away from the abrasive substantially by the support body, different from material breakthroughs extending from an abrasive facing side of the support body to a side facing away from the abrasive of the support body, since material breakthroughs at one of the abrasive facing away from the support body are unlimited.

In particular, one or more recesses of material cover a surface of the support body which faces the abrasive in a grinding operation over a wide area, so that a time-consuming alignment of the abrasive on the holding device to bring abrasive holes of the abrasive and suction openings of the holding device, to be dispensed with can. In particular, a number, arrangement and surface intake on a side facing the abrasive material of the at least one material recess or more Materialausnehmungen is selected so that at least in a plurality of hole patterns of abrasives, preferably at all hole patterns of abrasives, at least partially an overlap between abrasive holes of the abrasive and the at least one material recess or more Materialausnehmungen is achieved without performing an alignment step in which targeted the abrasive is placed in a specific orientation on the fixture. In particular, at least ten percent of an abrasive-side surface of the support body occupied by a material recess or material recesses, so that a high transport performance and a high probability of at least partial overlap with different hole patterns of abrasives and Materialausnehmungen, waiving an alignment step to a targeted orientation an abrasive and the holding device to each other, can be achieved. By the inventive design of the holding device, in particular a holding device can be provided, which can be used for different abrasives with different hole patterns of abrasive holes to a discharge of grinding dust, can be dispensed with a time-consuming alignment of a respective abrasive used on suction holes of the holding device. According to the invention it is proposed according to claim 1, that the at least one material recess is formed as an inner region of a channel member, which is at least partially curved, wherein the at least partially curved channel element is formed in the form of a Fibonacci spiral element. An "inner region of a channel element" should be understood in particular to be an elongate material recess which has an extent in a longitudinal direction which is at least five times as large, advantageously at least ten times as large and preferably at least twenty times as large as a maximum extent in a transverse direction. In principle, the channel element can be straight, have at least one bend or be curved. It can be achieved in particular a material recess with a high transport performance for sanding dust to be sucked.

An "at least partially curved channel element" should in particular be understood to mean a channel element which has a curved course along at least ten percent, advantageously at least fifty percent, and preferably at least ninety percent of an entire longitudinal extent. In particular, the at least partially curved channel element is designed as an annular channel or as a section of an annular channel. A "curved course" is understood to mean, in particular, a course deviating from a straight course, in particular a course with a constant radius of curvature become. In particular, it is possible to achieve a profile of the material recess with which a formation of flow dead zones, in which dust accumulates due to the tearing off of a flow, can be avoided in a particularly effective manner.

A "spiral element" is to be understood as meaning in particular an element, in particular a partial recess formed by a channel, which forms a spiral arm of a spiral structure, wherein the spiral arms can be connected to one another, in particular to a center region, connected or unconnected to one another. More specifically, by a "Fibonacci spiral element" is meant a spiral element having a course through vertices of contiguous and counterclockwise or consecutive squares, the side lengths of the counterclockwise or clockwise squares being in a relationship indicated by a Fibonacci sequence is to be understood, wherein an orientation of the vertices of successive squares through which the spiral element passes, also changes in the counterclockwise direction. In particular, a spiral element with a particularly advantageous profile can be achieved. Particular embodiments of the invention are formulated in the dependent claims, it is proposed that the support body has a spiral structure of at least partially curved channel elements. A "spiral structure" is to be understood in particular as meaning a structure having a plurality of spiral elements. In particular, a structure with material recesses can be achieved that combines a high degree of coverage of possible hole patterns of abrasive holes with a high proportion of a mounting surface for attachment of the abrasive.

Furthermore, it is proposed that the holding device has island-like support projections, between which the at least one material recess is arranged. By "supporting projections" are meant in particular material elevations over a base surface, whose upper sides form a preferably flat support surface. By "island-like support projections", in particular support projections are to be understood, which are over an angular range of at least two hundred and seventy degrees, preferably at least three hundred degrees, and preferably at least three hundred and thirty degrees surrounded by Materialausnehmungen. In particular, the at least one attachment layer is on top sides of the island-like support projections arranged. In particular, a large area occupation of a surface of the holding device combined with a firm adhesion by a plurality of attachment points of an attachment to an abrasive agent, which are formed by the attachment layer provided with the upper side of the island-like support projections, can be provided.

Furthermore, it is proposed that the holding device has web elements which connect the support projections to each other and which span at least one material recess. In particular, "flat elements" are to be understood as meaning flat elements which extend between the support projections and span the material recess. In particular, the at least one material recess is performed under the web elements. In particular, a high surface, which can be provided with a fastening layer, can be achieved.

In a further development, it is proposed that the web elements are made in one piece with the attachment layer. By the fact that "the web elements are designed in one piece with the attachment layer" should be understood in particular that the web elements are formed by elements of the attachment layer and in particular different from the support body are formed. In particular, the attachment layer is formed as a single layer element, in particular a single element of a Velcro layer, which is connected to the support projections of the support body. In particular, a holding device can be achieved with an attachment of the attachment layer to the support body that is easy to carry out.

It is also proposed that the holding device, in particular the support body, comprises at least one material recess formed as an inner region of a circumferential annular channel. It can be achieved in particular with a blockage of a portion of a material recess and / or a connection hole a diversion of a Schleifstaubstrom about a further material recess and / or another connection hole and thus a robustness against blockages.

Furthermore, it is proposed that the holding device, in particular the support body, at least one circumferential support ring which is formed free of material recesses comprises. A "circumferential support ring" is to be understood in particular as meaning an annular region which is free of movement along an entire path Material recesses is formed. In particular, a fastening layer is arranged on an entire surface of the circumferential support ring. In principle, the circumferential support ring may be formed as a separate component in addition to the support body. In particular, an attachment of the abrasive can be achieved with a high fastening security.

Furthermore, it is proposed that the support body has at least one connection hole for connection to a suction device, which is connected to the at least one material recess. A "connection hole" is to be understood in particular as a material breakthrough by the support body, which is intended to carry out grinding dust through the support body to a suction device which at least removes the grinding dust from a region of a workpiece and preferably collects it in a dust catching container. In principle, instead of suction holes, the support body can also have discharge holes, through which sanding dust can escape on the sides. In particular, a holding device can be achieved which allows a particularly dust-free working.

In a development of the invention, it is proposed that the at least one connection hole is formed by a center hole of the support body. Preferably, the center hole is fluidically connected to all material recesses. In particular, an advantageous positioning of the connection hole can be achieved.

It is further proposed that the holding device comprises at least one supply air opening, which is provided for supplying air to support the transverse transport of grinding dust. A "supply air opening" is to be understood in particular as a material breakthrough in the support body, which advantageously extends from an abrasive-facing side of the support body to a side facing away from the abrasive of the support body, and via which a supply of air to the support body is provided to generate an airflow to assist in the transverse transport of grinding dust in the at least one material recess and in a grinding gap between the abrasive and a workpiece. Alternatively, the at least one supply air opening could extend from an abrasive-facing side of the support body to a side of the support body that is oriented at least partially perpendicular to the abrasive. In particular, a high transport performance of the abrasive can be achieved.

In a development of the invention, it is proposed that the at least one supply air opening is formed by a center hole of the support body. In particular, an advantageous positioning of the supply air opening and a uniform air flow can be achieved.

Furthermore, a grinding device, in particular a hand grinder, proposed with a holding device according to the invention. A "grinding device" is to be understood in particular as meaning a device, preferably an electrical or pneumatic device, which is provided for the purpose of abrading workpieces by means of an abrasive. Preferably, the grinding device is designed as a hand grinder for operation by a person. Alternatively, the grinder may for example be attached to a work arm of an industrial robot or integrated in this.

Furthermore, a method for producing a holding device according to the invention is proposed. Advantageously, the support body is manufactured in a foaming process against a fastening layer, which is preferably designed as a single part. Preferably, the support body is made as a foam body and the attachment layer is formed as a Velcro layer. In particular, an uncomplicated and easy to carry out production of the holding device can be achieved.

Furthermore, a system comprising a holding device according to the invention and an abrasive is proposed.

The holding device according to the invention should not be limited to the application and embodiment described above. In particular, in order to fulfill a mode of operation described herein, the holding device according to the invention may have a number deviating from a number of individual elements, components and units mentioned herein.

drawings

Further advantages emerge from the following description of the drawing. In the drawing, nine embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Fig. 1

eine erfindungsgemäße Haltevorrichtung mit einer Vielzahl von Materialausnehmungen und inselartigen Stützvorsprüngen in einer Ansicht von oben,

Fig. 2

einen Querschnitt durch die erfindungsgemäße Haltevorrichtung gemäß Fig. 1 und ein Schleifmittel,

Fig. 3

eine alternative erfindungsgemäße Haltevorrichtung mit einer Vielzahl von Materialausnehmungen, inselartigen Stützvorsprüngen und Stegelementen, die die inselartigen Stützvorsprünge miteinander verbinden, in einer Ansicht von oben,

Fig. 4

einen Querschnitt durch die erfindungsgemäße Haltevorrichtung gemäß Fig. 3 und ein Schleifmittel,

Fig. 5

eine weitere alternative Haltevorrichtung, die eine Spiralstruktur von Materialausnehmungen, die als Fibonacci-Spiralelemente ausgebildet sind, aufweist, in einer Draufsicht,

Fig. 6

ein Schleifmittel mit Lochmuster in einer Ansicht von oben,

Fig. 7

eine schematische Darstellung einer Überdeckung des Lochmusters des Schleifmittels aus Fig. 6 mit der Spiralstruktur der Materialausnehmungen aus Fig. 5,

Fig. 8

eine dritte alternative Haltevorrichtung mit einer Spiralstruktur von Materialausnehmungen, die als Fibonacci-Spiralelemente ausgebildet sind, in einer Draufsicht, mitsamt einer Überdeckung eines Lochmusters eines Schleifmittels mit der Spiralstruktur,

Fig. 9

eine vierte alternative Haltevorrichtung mit einer Spiralstruktur aus V-förmigen Kanalelementen,

Fig. 10

eine fünfte alternative Haltevorrichtung mit einer Spiralstruktur aus U-förmigen Kanalelementen,

Fig. 11

eine sechste alternative Haltevorrichtung mit Materialausnehmungen, die als exzentrisch angeordnete, gerade verlaufende Kanalelemente ausgebildet sind,

Fig. 12

eine siebte alternative Haltevorrichtung mit Materialausnehmungen, die als zentrisch angeordnete, gerade verlaufende Kanalelemente ausgebildet sind, und

Fig. 13

eine achte alternative Haltevorrichtung mit Materialausnehmungen, die als zentrisch angeordnete, gerade verlaufende Kanalelemente ausgebildet sind und die mit einem Zentrumsloch als Verbindungsloch zu einer Absaugvorrichtung verbunden sind.

Show it:

Fig. 1

a holding device according to the invention with a plurality of material recesses and island-like supporting projections in a view from above,

Fig. 2

a cross section through the holding device according to the invention Fig. 1 and an abrasive,

Fig. 3

an alternative holding device according to the invention with a plurality of material recesses, island-like support projections and web elements which connect the island-like support projections together, in a view from above,

Fig. 4

a cross section through the holding device according to the invention Fig. 3 and an abrasive,

Fig. 5

FIG. 2 shows a further alternative holding device, which has a spiral structure of material recesses, which are formed as Fibonacci spiral elements, in a plan view, FIG.

Fig. 6

an abrasive with hole pattern in a top view,

Fig. 7

a schematic representation of an overlap of the hole pattern of the abrasive from Fig. 6 with the spiral structure of the Materialausnehmungen Fig. 5 .

Fig. 8

a third alternative holding device with a spiral structure of material recesses, which are formed as Fibonacci spiral elements, in a plan view, together with an overlap of a hole pattern of an abrasive with the spiral structure,

Fig. 9

a fourth alternative holding device with a spiral structure of V-shaped channel elements,

Fig. 10

a fifth alternative holding device with a spiral structure of U-shaped channel elements,

Fig. 11

a sixth alternative holding device with material recesses, which are designed as eccentrically arranged, straight running channel elements,

Fig. 12

a seventh alternative holding device with material recesses, which are formed as centrally arranged, straight running channel elements, and

Fig. 13

an eighth alternative holding device with material recesses, which are formed as centrally arranged, straight running channel elements and which are connected to a center hole as a connection hole to a suction device.

Description of the embodiments

Fig. 1 shows a designed as a sanding pad holding device 10a for an abrasive 30a (see Fig.2 ), with a support body 12a comprising material recesses 20a provided for transversely transporting grinding dust on a side facing the abrasive article 30a in a plane parallel to a grinding surface 24a, and a fixing layer 14a for fixing the abrasive article 30a on the support body 12a , The material recesses 20a are substantially open in a state decoupled from the abrasive 30a on a side facing the abrasive 30a, and are essentially delimited by the support body 12a on a side facing away from the abrasive 30a. The material recesses 20a are completely uncovered by the attachment layer 14a, and in the state decoupled from the abrasive 30a, the attachment layer 14a is disposed on the support body 12a, but the abrasive 30a is not yet attached to the attachment layer 14a. The holding device 10a has island-like support projections 16a, between which the material recesses 20a are arranged. The island-like supporting projections 16a are enclosed on all sides by the material recesses 20a and / or a center hole 42a of the supporting body 12a or an outer side of the holding device. On an abrasive side upper side of the island-like support projections 16a, the attachment layer 14a is arranged ( Fig. 2 ). The attachment layer 14a is formed as a hook-and-loop layer that secures a suede-coated abrasive substrate 36a of the abrasive article 30a. The material recesses 20a are formed in part as inner portions of straight longitudinal passages which extend radially toward the center hole 42a, and partly as inner portions of curved passage members 22a extending in a fixed radius around the center hole 42a. The material recesses 20a designed as inner regions of curved channel elements 22a are thus annular channels surrounding the inner region 44a trained. There are about twenty percent of an abrasive side surface of the support body 12a occupied by the material recesses 20a. The support body 12a has connection holes 40a for connection to a suction device, which are connected to the at least one material recess 20a. In the illustrated embodiment, four communication holes 40a are distributed over the support body 12a, and fundamentally, different numbers of communication holes 40a may be formed in the support body 12a. The holding device 10a is provided to connect the abrasive 30a with a trained as a hand grinder electric grinder. In principle, the grinding device can also be fastened to a robot for automated machining of a workpiece and / or integrated into it. By forming some material recesses 20a as inner regions of annular channels 44a, a material recess 20a formed as a longitudinal channel can become clogged, for example by grinding dust of resinous materials or by foreign substances such as adhesives, grinding dust via the annular channel 44a and a further material recess 20a formed as an inner region of a longitudinal channel the connection hole 40a are passed.

For machining a workpiece, an abrasive 30a is attached to the fixture 10a ( Fig. 2 ). The fixture 10a and abrasive 30a system is then attached to the sander. The abrasive 30a comprises the abrasive layer 36a formed as a suede layer and an abrasive grain layer 34a of abrasive grains deposited thereon. The abrasive grains are preferably made of a ceramic material and preferably have a defined shape predetermined by a manufacturing process. The abrasive grains in the abrasive grain layer 34a are fixed to a surface of the abrasive backing 36a by a first adhesive layer of a base binder and firmly bonded to the abrasive backing by a second adhesive layer of a size coat binder. The abrasive article 30a has abrasive holes 32a for discharging abrasive dust generated during a grinding operation, which are arranged in a pattern of holes. After coupling the abrasive 30a to the holder 10a, in the grinding operation, grinding dust enters the material recesses 20a through the abrasive holes 32a and is guided therethrough to the communicating hole 40a and removed by the suction device. Due to the material recesses 20a, in particular by a wide-area coverage of the abrasive-side surface of the support body 12a through the material recesses 20a, may be on a specific orientation of the abrasive 30a on the holding device 10a, to the abrasive holes 32a with connecting holes 40a of the support body 12a to make cover, are omitted, whereby a time-consuming step is saved in a mounting of the abrasive 30a on the holding device 10a. In particular, a change of the abrasive 30a on the holding device 10a can thus be carried out quickly. The supporting body 12a of the holding device 10 is made in one piece with a foam body 26a of the holding device 10a, which consists of a foam material and provides a deformable support body for the abrasive 30a, which allows adaptation of the grinding surface 24a to contours of a workpiece. In alternative embodiments of the holding device 10a according to the invention, it is conceivable that the support body 12a is formed as a separate component to the foam body 26a, for example as a support disk, which is placed on the foam body 26a. The holding device 10a comprises a bottom plate 46a made of fiberglass, which reaches a grinder end of the foam body 26a and provides a solid surface for the foam body 26a. Furthermore, the holding device 10a comprises a coating layer 28a, which is arranged on lateral edges of the foam body 26a and consists of a foam material which has a higher strength than a material of the foam body 26a. The cladding layer 28a protects the foam body 26a against damage. In principle, the holding device 10a may be designed without a cover layer 28a and / or base plate 46a and may have only one foam body 26a, one support body 12a and one attachment layer 14a. The holding device 10a is fastened to the grinding device by any means which appears appropriate to a person skilled in the art, for example with screw connections which connect the bottom plate 46a and the grinding device. In a method for producing the holding device 10a, a fastening layer 14a is inserted into a correspondingly shaped foaming tool, and the supporting body 12a is manufactured in a foaming process against the fastening layer 14a. Alternatively, first, the support body 12a may be manufactured, wherein the material recesses 20a are generated during manufacture of the support body 12a or in a separate manufacturing step, and the attachment layer 14a is subsequently applied to the island-like support projections 16a.

In the FIGS. 3 to 13 eight further embodiments of the invention are shown. The following descriptions and the drawings are essentially limited to the differences between the embodiments, with respect to the same components, in particular with respect to components with the same reference numerals, in principle also to the drawings and / or the description of the other Embodiments, in particular the FIGS. 1 to 2 is referenced. To distinguish the embodiments of the letter a is the reference numerals of the embodiment in the FIGS. 1 to 2 readjusted. In the embodiments of the FIGS. 3 to 13 the letter a is replaced by the letters b to i.

In the 3 and 4 an alternative holding device 10b is shown. The holding device 10b comprises a supporting body 12b comprising material recesses 20b provided for transversely transporting grinding dust on a side facing the abrasive 30b in a plane parallel to a grinding surface 24b, and a hooking layer 14b for fixing an abrasive 30b the support body 12b. The material recesses 20b are substantially open in a state decoupled from the abrasive material 30b on a side facing the abrasive material 30b and are essentially delimited by the support body 12b on a side facing away from the abrasive material 30b and extend between island-like support projections 16b. The holding device 10b has web elements 18b which connect the support projections 16b to each other and span the material recesses 20b. The web elements 18b are made in one piece with the attachment layer 14b. Alternatively, the web elements 18b could be made separately from foam or plastic. The material recesses 20b continue to be sixty percent uncovered with overvoltage by the web elements 18b in the state decoupled from the abrasive material 30b. Material recesses 20b spanned by web elements 18b are marked in the drawing by dashed outlines. The support body of the holding device 10b further comprises a circumferential support ring 38b, which is formed free of material recesses 20b and is also covered by the attachment layer 14b. A structure of the holding device 10b and a function of components of the holding device 10b is otherwise completely analogous to the previous embodiment. The web elements 18b provide additional mounting surface over the embodiment of the previous embodiment, whereby attachment of the abrasive 30b to the retainer 10b obtains high strength. Furthermore, formation of the attachment layer 14b as a coherent overall element is achieved by the web elements 18b. By forming the attachment layer 14b as a coherent overall element, a method for producing the holding device 10b, in which the support body 12b is manufactured in a foaming process against the attachment layer 14b, can be carried out with process steps which are not complicated and be carried out with a structurally simple foaming tool.

In Fig. 5 another alternative embodiment of a holding device 10c for an abrasive 30c is shown. The holding device 10c has a support body 12c comprising material recesses 20c provided for a grinding dust on a side of abrasive dust facing the abrasive article 30c in a plane parallel to a grinding surface 24c, and a fixing layer 14c for fixing the abrasive article 30c on the abrasive material Support body 12c. The material recesses 20c are substantially open in a state decoupled from the abrasive 30c on a side facing the abrasive 30c, are substantially bounded by the support body 12c on a side facing away from the abrasive 30c, and are completely uncovered by the attachment layer 14c from the abrasive agent 30c decoupled state, the attachment layer 14c is disposed on the support body 12c, but the abrasive agent 30c is not yet attached to the attachment layer 14c. The material recesses 20c are formed as inner regions of channel elements 22c. The channel elements 22c are curved and formed as spiral elements which form spiral arms of a spiral structure. The support body 12c has a total of nine curved channel elements, so that the support body 12c has a nine-arm spiral structure of curved channel elements 22c. The inner recesses curved channel elements 22c formed Materialausnehmungen 20c are mutually unconnected. The curved channel elements 22c are in the form of Fibonacci spiral elements, the Fibonacci spiral elements having a design rule by connecting vertices of contiguous and counterclockwise successive squares with side lengths of the anticlockwise contiguous squares in relation to each other, which is given by a Fibonacci sequence, and an orientation of the vertices of successive squares through which the spiral element passes, also changes in the counterclockwise direction. A course of the Fibonacci spiral elements and a wide coverage of a surface of the abrasive body 12c abrasive surface is a high probability of coverage of one or more abrasive holes 32c different hole patterns of abrasives 30c and formed as Fibonacci spiral material recesses 20c achieved without the abrasive 30c and holding device 10c must be specifically aligned with each other in an alignment step. The support body 12c has communication holes 40c a connection with a suction device, which are each connected to a material recess 20c. The communication holes 40c each have a circular diameter larger than a width of the curved channel members 22c. A center hole 42c of the support body 12c is free from connection to a suction device in this embodiment. There are about 20 percent of a abrasive-side surface of the support body 12 c occupied by the material recesses 20 c. The support body 12c further comprises a circumferential support ring 38c, which is formed free of material recesses 20c. In principle, the circumferential support ring 38c could be formed in alternative embodiments as a separate component in addition to the support body 12c. In a further alternative embodiment, the material recesses 20c can in principle be connected to one another via an encircling connecting channel in ring form, so that a transport of grinding dust to a further connecting hole 40c can be achieved even with a blockage of a material recess 20c and / or a connecting hole 40c via the connecting channel ,

In Fig. 6 is an abrasive 30c having an abrasive layer 34c applied to a suede backing pad 36c, not shown, and having a hole pattern of seventeen abrasive holes 32c. Fig. 7 shows the holding device 10c Fig. 5 with a schematically illustrated covering of the material recesses 20c and the abrasive holes 32c of the abrasive 30c from the Fig. 6 , Due to the spiral structure of the material recesses 20c of the support body 12c and a wide coverage of a surface of the abrasive body 12c abrasive surface is at least a partial overlap of at least one abrasive hole 32c for removal of grinding dust and at least one material recess 20c, without a targeted orientation of the abrasive 30c, in order to align the abrasive holes 32c and the communication holes 40c with the mounting of the abrasive article 30c to the fixture 10c, must be performed. Further, other hole patterns of abrasive holes 32c without targeted alignment of the abrasive article 30c are at least partially aligned with the material recesses 20c with a high degree of probability, so that extraction of grinding dust dispenses with targeted alignment upon assembly of the abrasive article 30c to the fixture 10c is reached. The holding device 10c can thus be used for abrasives 30c with different hole patterns.

In Fig. 8 A further alternative embodiment of a holding device 10d for an abrasive means 30d is shown, which is designed analogously to the previous embodiment. The holding device 10d comprises a support body 12d, the material recesses 20d provided for cross-transporting abrasive dust on a side facing the abrasive 30d in a plane parallel to a grinding surface 24d, and a fixing layer 14d for fixing the abrasive 30d on the support body 12d. The material recesses 20d are substantially open in a state decoupled from the abrasive 30d on a side facing the abrasive 30d, are substantially delimited by the support body 12d on a side remote from the abrasive 30d, and completely uncovered by the attachment layer 14d from the abrasive agent 30d decoupled state, the attachment layer 14d is disposed on the support body 12d, but the abrasive agent 30d is not yet attached to the attachment layer 14d. The material recesses 20d are also formed as inner regions of curved, designed as Fibonacci spiral elements, channel elements 22d. The support body 12d has, instead of nine, a total of sixteen material recesses 20d, which are arranged in a spiral structure. There are about thirty percent of the abrasive-side surface of the support body 12 d occupied by material recesses 20 d. As in the previous example, the support body 12d connecting holes 40d to a connection with a suction device, wherein in each case a connection hole 40d is connected to a material recess 20d and formed as inner regions of curved channel elements 22d material recesses 20d are formed unconnected to each other. Furthermore, the support body 12d comprises a circumferential support ring 38d, which is free of material recesses 20c and forms a peripheral outer edge of the support body 12d.

Fig. 9 shows another alternative embodiment of a holding device 10e for an abrasive 30e. The holding device 10e includes a supporting body 12e having material recesses 20e provided for cross-transporting grinding dust on a side facing the abrasive 30e in a plane parallel to a grinding surface 24e, and a fixing layer 14e for fixing the abrasive 30e on the supporting body 12e , The material recesses 20e are substantially open in a state decoupled from the abrasive 30e on a side facing the abrasive 30e, are substantially delimited by the support body 12e on a side remote from the abrasive 30e, and are completely uncovered by the attachment layer 14e from the abrasive 30e decoupled state, the attachment layer 14e arranged on the support body 12e, the abrasive 30e is not yet attached to the attachment layer 14e. The material recesses 20e are formed as inner regions of curved channel elements 22e. The channel members 22e have a V-shape, and at a tip of the V-shape, a communication hole 40e is respectively arranged for connection to a suction device. The support body 12e of the holding device 10e has a total of eight material recesses 20e, which are oriented around a center hole 42e. The center hole 42e is formed as a supply air opening provided for supplying air to assist the transverse transport of grinding dust.

Fig. 10 shows a further alternative embodiment of a holding device 10f for an abrasive 30f, which is substantially similar to the previous embodiment. The embodiment differs from the previous embodiment in a form of the material recesses 20f, which are provided for a transverse transport of grinding dust on a side facing the abrasive 30f in a plane parallel to a grinding surface 24f and in a state decoupled from the abrasive 30f on a The side facing the abrasive 30f substantially open, on a side facing away from the abrasive 30f substantially limited by the support body 12f and are completely uncovered by a mounting layer 14e. The material recesses 20f are formed as inner portions of curved channel members 22f having a U-shape. In a middle portion of the U-shape of the channel members 22f, a communication hole 40f is respectively arranged for connection to a suction device. A total of eight material recesses 20f are arranged on the support body, which are oriented symmetrically about a center hole 42f. The center hole 42f is formed as a supply air opening provided for supplying air for assisting the transverse transport of grinding dust.

Another alternative embodiment of an abrasive grinder holding device 10g has eight material recesses 20g provided for transverse transport of grinding dust on a side facing the abrasive 30g in a plane parallel to a grinding surface 24g formed as internal portions of straight channel members 22g. on ( Fig. 11 ). Another embodiment of a supporting body 12g, a fixing layer 14g and the material recesses 20g corresponds to those of the previous embodiments. The material recesses 20g are arranged symmetrically about a center hole 42g of the support body 12g, with an orientation different between a course of the passage member 22g and the center hole 42g for each passage member 22g. The material recesses 20g thus have an eccentric arrangement on the support body 12g. In each case in a middle of a material recess 20g, a connection hole 40g is arranged for connection to a suction device. The center hole 42g is formed as an intake air opening provided for supplying air to assist the transverse transport of grinding dust.

In Fig. 12 For example, another alternative embodiment of a holding device 10h for an abrasive 30h having eight material recesses 20h formed as interior portions of straight channel members 22h is shown. The holding device 10h is, except for an orientation of the channel elements 22h, formed analogous to the previous embodiment. The channel members 22h are identically oriented and point with a direction of longitudinal extension to a center hole 42h of a support body 12h. The material recesses 20h thus have an eccentric arrangement on the support body 12h. In each case in a middle of a material recess 20h, a connection hole 40h is arranged for connection to a suction device. The center hole 42h is formed as an intake air opening provided for supplying air for assisting the transverse transport of grinding dust on a side facing the abrasive 30h.

A further embodiment of the invention, which is formed substantially analogously to the preceding embodiment, is shown in FIG Fig. 13 shown. In contrast to the previous exemplary embodiment, material recesses 20i of a support body 12i of a holding device 10i formed as inner regions of straightly formed channel elements 22i are connected to a center hole 42i of the support body 12i. The center hole 42i of the support body 12i is formed as a communication hole 40h for connection to a suction device. Another embodiment of the holding device 10i is completely analogous to that of the previous embodiment.

Claims (14)

1. Holding device, in particular a grinding disc, for a grinding means (30a-i), having at least one support body (12a-i), which comprises at least one material recess (20a-i), which is provided for transverse transport of grinding dust on a side facing the grinding means (30a-i) in a plane parallel to a grinding face (24a-i), and having at least one securing layer (14a-i) for securing the grinding means (30a-i) on the at least one support body (12a-i), wherein, when decoupled from the grinding means (30a-i), the at least one material recess (20a-i) is at least substantially open on a side facing the grinding means (30a-i) and is substantially delimited by the support body (12a-i) on a side facing away from the grinding means (30a-i), characterized in that the at least one material recess (20a-i) is formed as an inner region of a channel element (22a-i), i.e. as an elongate material depression, which is at least partially curved, wherein the at least partially curved channel element (22c-d) is formed as a Fibonacci spiral element.
2. Holding device according to Claim 1, characterized in that the support body (12c-d) has a spiral structure formed from at least partially curved channel elements (22c-f).
3. Holding device according to one of the preceding claims, characterized by at least one material recess (20a-b) formed as an inner region of a peripheral annular channel (44a-b).
4. Holding device according to Claim 1, characterized by island-like support protrusions (16a-b), between which the at least one material recess (20a-b) is arranged.
5. Holding device according to Claim 4, characterized by web elements (18b), which interconnect support protrusions (16b) and straddle the at least one material recess (20b).
6. Holding device according to Claim 5, characterized in that the web elements (18b) are formed integrally with the securing layer (14b).
7. Holding device according to one of the preceding claims, characterized by at least one peripheral support ring (38b-d), which is free from material recesses (20b-d).
8. Holding device according to one of the preceding claims, characterized in that the support body (12a-i) has at least one connection hole (40a-i) for connection to a suction device, which is connected to the at least one material recess (20a-i) .
9. Holding device according to Claim 8, characterized in that the at least one connection hole (40i) is formed by a centre hole (42i) of the support body (12i) .
10. Holding device according to one of the preceding claims, characterized by at least one feed air opening, which is provided for a feed of air to assist the transverse transport of grinding dust.
11. Holding device according to Claim 10, characterized in that the at least one feed air opening is formed by a centre hole of the support body.
12. Grinding apparatus having a holding device according to one of Claims 1 to 11.
13. Method for producing a holding device according to one of Claims 1 to 11, characterized in that the support body (12a-i) is fabricated in a process in which it is formed onto a securing layer (14a-i), which is preferably formed as an individual part.
14. System formed from a holding device (10a-i) according to one of Claims 1 to 11 and a grinding means (30a-i).

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