EP2758210B1 - Retaining body for flexible grinding means, grinding system, and grinding tool - Google Patents

Description

State of the art

The invention relates to a holder body for flexible abrasive, a grinding system and a grinding device, in particular a hand grinder according to the preamble of the independent claims.

Generic holding body in the form of grinding plates are, for example, in DE 20 2009 000 880 and EP 0 781 629 A1 described. These sanding pads have a soft support body, which may comprise, for example, foam, as well as a Velcro or adhesive layer for bonding with a flexible abrasive. The flexible abrasive may be, for example, a grinding wheel. These known sanding plates have a plurality of bores running in the axial direction, through which air and grinding dust produced during sanding can be sucked off. These holes penetrate both the soft layer and the Velcro or adhesive layer.

Due to the necessary holes results for the respective grinding plate a characteristic hole pattern to which the abrasive used hereby must be adapted. These must in fact have holes with a corresponding hole pattern. This is particularly disadvantageous because only a very specific abrasive can be used with a given sanding pad. In addition, when attaching the abrasive to the sanding pad, the relative orientation of the sanding media to the sanding pad must be taken into account so that the holes in the abrasive are congruent with the holes in the sanding pad, allowing extraction. Constructively complex solutions to this problem are z. B. off EP 1 977 858 or WO 2009/088772 A2 known. In addition, another generic holding body with an air and permeable mounting surface of the WO 2007/143400 A2 known.

Disclosure of the invention Advantages of the invention

The holding body according to the invention with the features of claim 1 has the advantage that a sanding dust resulting from the working process can initially pass through the attachment layer substantially unhindered and by the shortest path, since the attachment surface of the attachment layer extends in a direction substantially perpendicular to the attachment surface is substantially air and dust permeable. In this case, a "air- and dust-permeable attachment layer" in particular a fastening layer understood, which consists at least partially of an air and dust permeable, especially open-pore material and / or at least partially made of a material which by at least one processing step, such as punching, milling and / or drilling, in particular by laser drilling or other method with the material piercing holes and / or channels was made air and dust permeable. Thus, an air flow, in particular a dust-containing air flow, from the mounting surface substantially perpendicular to the mounting surface through the attachment layer occur. As a result, a back pressure is advantageously reduced by the attachment layer. At the same time, dust particles reach the side of the fastening layer facing away from the grinding process by the shortest route from the side of the fastening layer facing a grinding process.

The measures listed in the dependent claims, advantageous refinements and improvements of the main claim features.

If a flow of air substantially perpendicular to the fastening surface, in particular dust-containing air flow, after passing through the fastening layer undergoes at least a partial deflection into a transverse flow passing through the support body substantially behind the fastening layer from the viewpoint of the abrasive, a uniform removal of the grinding dust can be achieved in a simple manner be without a strong throttling of the suction air flow must be overcome. This is particularly important for applications in which the mounting surface of the holder body is significantly larger as a cross-sectional area of a suction-side area. Thus, holding body according to the invention may preferably be formed in a truncated cone, in particular, the larger of the base surfaces is designed as a mounting surface.

In a preferred embodiment, the fastening means of the holding body according to the invention are designed as mechanical fastening means for fastening a flexible abrasive, in particular as loops and / or hooks protruding from the fastening surface.

In a particularly preferred embodiment, the attachment layer contains an open-pored material. However, the attachment layer can also consist of the open-pored material. At this point, "open-pored" is understood as meaning in particular a material which has pores, channels, openings and / or recesses along at least one spatial direction, in particular perpendicular to the fastening surface, so that a dust-laden air stream can pass through the material. Typically, the grinding dust generated during a grinding process has a typical size distribution of the abrasive particles, so that preferably the minimum passage cross-sections of the channels, openings and / or recesses or porosity of the pores are defined by the largest typically occurring abrasive particles.

With a textile material can be in a particularly simple and inexpensive way to achieve the training as an open-pored material. Therefore, the attachment layer of a particularly preferred embodiment of the holding body according to the invention contains a textile material or consists thereof. Preferably, the textile material has loops and / or hooks and / or mushroom heads as fastening means, which are particularly suitable for the formation of a known Velcro system. However, it is also conceivable that a dense from its material structure, in particular dust and air impermeable material according to the invention as a fastening layer by suitable perforation, perforations and / or perforations in regular or irregular patterns are advantageously used. Also, suitable perforations, perforations and / or perforations in regular or irregular patterns can be advantageously combined with textile materials or material blends.

A preferred development of the holding body according to the invention is achieved when the attachment layer covers the attachment surface almost completely, preferably completely.

The inventive design of the holding body is achieved in that the support body has a dust chamber, which is provided in a region adjacent to the support surface area, wherein the dust chamber from the viewpoint of the support surface has a honeycomb structure, with channels, grooves and / or grooves for guiding is traversed by an air flow. In particular, it is achieved by such a dust chamber that an optionally constructive pressure barrier obstructing the dusty air flow is advantageously reduced after passing through the fastening layer according to the invention. This is particularly important for applications in which the mounting surface of the holder body is significantly larger than a cross-sectional area of a suction-side region, since an increasing constriction of a lateral expansion of the air flow when flowing through the support body could cause a throttling effect especially in such applications. The dust chamber makes it possible here to realize the deflection of the air flow with the lowest possible losses. Alternatively or additionally, at least one dust chamber can also be provided in the inner support body, which has similar effects. Preferably, therefore, the deflection of the air flow substantially in the dust chamber.

If the support body of the holding body according to the invention has at least one exhaust air hole which connects the dust space with a surface lying opposite the support surface and is permeable to dust and can be sucked out of the dust space by the air, then the holding body according to the invention can be attached to a grinding machine with a suction device an internal or even an external intended suction, apply.

In a further development, the support body has at least one supply air bore, via which an air flow can be conducted into an area in front of the attachment layer of the support body. In a particularly preferred embodiment, the Zuluftbohrung introduces fresh air into a central region of the holding body, from which the fresh air is supplied to a processing area.

In a particularly preferred embodiment, the honeycomb-like structure of the dust chamber is substantially protruding from the rest of the support body Support projections formed which at least partially protrude into the support surface, so that the protruding into the support surfaces parts of the support projections form parts of the support surface, wherein the attachment layer is preferably connected to these parts of the support surfaces, in particular glued and / or welded. As a result, a more uniform distribution of the loads in the application to the connection of the attachment layer is achieved on the holding body. At the same time, the attachment layer is supported more uniformly on the support surface, so that the machining forces can be transmitted more uniformly distributed over the surface.

A further advantageous further development of the holding body according to the invention provides that the support body has a connection surface substantially opposite the support surface, wherein the connection surface has a smaller surface area, in particular a smaller outer diameter than the support surface and wherein at least one suction opening is provided in the connection surface.

If the support body has at least one support body and a cover plate, wherein the support body extends between the support surface and the cover plate and is permeable to air and dust, in particular consists of an air- and dust-permeable material, and wherein the cover plate substantially forms the connection surface can the support body are advantageously protected against mechanical damage. Furthermore, the cover plate allows the integration of a robust interface for connecting the holding body according to the invention with a grinding machine. The interface can be designed in particular as a screw, latching, clips and / or plug connection. However, other embodiments of tool interfaces, such as, for example, for rotary oscillation tools, which may advantageously be provided in or on the cover plate, are known to the person skilled in the art.

In an alternative or additional development can be provided that the support body has a protective body, preferably radially enclosed by this, wherein a support surface facing the radial outer contour is substantially equal to an outer contour of the support surface, preferably with this almost identical. The protective body advantageously secures the support body in its circumferential surface against mechanical damage. Furthermore, the protective body may be provided to form a supporting body in its circumferential surface air and dustproof, in particular a support body, preferably a support body air-tight and dust-tight seal an open-pored material in its peripheral surface, so that only over radial faces an air flow can pass through the holder body.

Furthermore, the protective body can have an advantageous contact surface lying in a plane of the support surface, wherein the fastening layer is connected, in particular adhesively bonded and / or welded, at least on the contact surface, so that in particular the fastening layer is preferably peripherally connected to the protective body. The Anlagefäche is preferably formed as a flat annular surface or flat, ring-like surface. An abrasive suitable for the invention comprises a working layer substantially covering a working layer, an air- and dust-permeable carrier layer, and a connecting layer having connecting means for securing the abrasive to the holding body and providing a connecting surface substantially remote from the working surface is formed so that the connecting surface in a direction substantially perpendicular to the connecting surface extending direction is substantially permeable to air and dust. A "flexible abrasive" is understood in particular to mean a grinding wheel which, in a loose state not connected to the holding body, can be bent, buckled or otherwise deformed at least in a direction perpendicular to the work surface. In this case, a "working layer" is understood as meaning, in particular, a layer having at least one abrasive medium, such as, for example, abrasive grains of known grinding media with a given abrasive grain distribution. The carrier layer may have an open-pore, in particular air and dust-permeable paper, textile foam and / or elastomer component, in particular consist thereof. The connecting layer may preferably comprise a textile and / or otherwise open-pored material, in particular consist thereof, which has suitable connection means for the connection to the fastening means of the holding body according to the invention.

In another aspect, the invention relates to a grinding system comprising a holding body according to the invention and at least one abrasive, which is fastened to the mounting surface of the holding body. The abrasive is included preferably designed at least partially air and dust permeable. For example, perforations, in particular openings or perforations in the abrasive material may be provided which are distributed over a working surface of the abrasive.

Finally, in a further aspect, the invention relates to a grinding machine, in particular a hand grinder comprising at least one holding body according to the invention and a drive unit for driving the at least one holding body. A preferred grinding machine further comprises a suction device, which provides a suction air flow, which flows from the attachment surface over the holding body according to the invention in the direction of the suction device. The suction device can be designed as a pipe system for connecting an external suction unit and / or as actively driven by the drive unit of the grinding machine suction device.

Description of the drawings

Fig. 1

eine Teilschnittansicht einer Schleifmaschine mit einem Haltekörper nach dem Stand der Technik

Fig. 2

eine schematische Schnittansicht eines Haltekörpers nach du Stand der Technik

Fig. 3

eine schematische Schnittansicht eines Ausführungsbeispiels eines erfindungsgemäßen Haltekörpers

Fig. 4

eine Aufsicht auf die Stützfläche eines erfindungsgemäßen Haltekörpers in einer Ausführung nach Fig. 3

Fig. 5

eine schematische Schnittansicht eines zweiten Ausführungsbeispiels eines erfindungsgemäßen Haltekörpers

Fig. 6a, 6b

ein Schemaansichten eines Schleifmittels zur Anbringung an einen erfindungsgemäßen Haltekörper

Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. Show it:

Fig. 1

a partial sectional view of a grinding machine with a holding body according to the prior art

Fig. 2

a schematic sectional view of a holding body according to the prior art

Fig. 3

a schematic sectional view of an embodiment of a holding body according to the invention

Fig. 4

a plan view of the support surface of a holding body according to the invention in an embodiment according to Fig. 3

Fig. 5

a schematic sectional view of a second embodiment of a holding body according to the invention

Fig. 6a, 6b

a schematic views of an abrasive for attachment to a holding body according to the invention

Description of the embodiments

In Fig. 1 is an example of a grinding machine 10 with a holding body according to the prior art fragmentary and partially cut a hand-held eccentric grinder, hereinafter referred to as eccentric grinder, shown for performing grinding in side view. The eccentric grinder has a housing 11, which merges in the viewing direction to the left in a handle 12, on the underside of a switch button 13 for switching on and off of a recorded inside the housing 11 electric motor 14 of a drive unit 11a is arranged. On the output shaft 15 of the electric motor 14 is rotatably seated an impeller 16 of a suction fan, which is sucked with the resulting grinding work on the surface of a workpiece grinding dust and transported via a discharge port 17 in a dust collecting container. In the hub of the impeller 16, an eccentric recess 18 is provided, in which a protruding on the underside of the housing 11 driver 19 is immersed, which is supported on two roller bearings 20, 21 on the inner wall of the eccentric recess 18. About the rolling bearings 20, 21 takes place, depending on the bearing friction, the rotational drive of the driver 19. Rolling 20, 21 and driver 19 are held axially immovable in the eccentric recess 18.

On the underside of the driver 19, a flat support surface 191 is formed, to which a designed as a sanding pad 22 holding body 30 according to the prior art with a formed on its upper surface contact surface 23 can be attached. The connection between the grinding plate 22 and driver 19 via at least one cap screw 24, which is screwed into at least one formed in the driver 19, axial bore 192. At the bottom of the housing 11, a disk brake 25 is secured against rotation against rotation, which hangs on the top of the sanding pad 22.

The sanding pad 22 consists of two components, a support plate 26 made of a hard plastic and attached to the underside of the support plate 2 6 sanding pad 27. The contact surface 23 of the sanding pad 22 is formed centrally on the support plate 26. On the side facing away from the support plate 26 underside of the sanding pad 27, a support surface 271 is formed for a not shown abrasive sheet, which carries a Velcro covering 28 for attaching a velor back bearing sanding sheet. When using self-adhesive sanding paper eliminates the Velcro. in the Sanding pad 22 are provided by support plate 26 and sanding pad 27 passing dust suction openings 29 through which the sanding dust is sucked into a formed in the housing 11, connected to the blowout 17 Staubansaugkammer by means of a suction air flow 31 in which the impeller 16 rotates. In the abrasive sheet according to the prior art, not shown here, perforations, in particular holes are provided for the extraction of the resulting during processing grinding dust, which must be brought to the preparation of the abrasive sheet for optimal extraction with the Staubabsaugöffnungen 29 in coverage. To simplify the piecing, it is known, among other things, to make the dust extraction openings 29 larger than the openings in the sanding sheet so that overlapping can be achieved more easily. Sanding sheets are also known which have a number exceeding the number of dust extraction openings 29, in particular a multiplicity of perforations, so that overlapping can be achieved more easily.

Fig. 2 shows a designed as a sanding pad 220 holding body 300. The holding body 300 is formed circular disk-shaped. Fig. 2 does not fall under the scope of the claims. The holding body 300 comprises a preferably substantially circular disk-shaped supporting body 301 and a fixing layer 302, which is arranged on a substantially flat, preferably flat supporting surface 303 of the supporting body 301. The attachment layer 302 is connected to the support body 301 with a holding surface 304, which is preferably arranged substantially opposite the support surface 303. For this purpose, the attachment layer 302 with its holding surface 304 preferably at least partially and / or in sections adhered to the support surface 303 of the support body 301, welded, clamped, wedged, clipped and / or otherwise material and / or positively connected. The holding surface 304 preferably lies opposite a fastening surface 305 of the fastening layer 302, which has fastening means 306 for fastening a flexible abrasive 400. Preferably, the fasteners 306 are configured to cooperate with a connecting means of the flexible abrasive article 400, not shown here, for providing a releasable connection of the flexible abrasive article 400 to the retainer body 300.

In one embodiment, the attachment layer 302 is at least partially, but preferably almost completely made of an air- and dust-permeable material 307, so that the attachment layer 302 is substantially permeable to air and dust, in particular in a direction 308 extending substantially perpendicular to the attachment surface 305. In this case, the attachment layer 302 consists in a particularly preferred embodiment of an air- and dust-permeable - preferably textile - Velcro material 309th

The support body 301 is in the embodiment according to Fig. 2 At least the support body 311 is formed permeable to air and dust, preferably the support body 311 is at least partially, preferably almost completely made of an air- and dust-permeable material 312. The air- and dust-permeable material 312 can in particular a foam or another, open-pored material.

In the execution after Fig. 2 The protective body 310 preferably surrounds the support body 311 substantially annularly, wherein "annularly enclosing" means in particular that the support body 311 along its peripheral line or its enveloping surface 311a is almost completely, preferably completely enclosed or enclosed by the protective body 310, in particular radially is. In this case, a radial outer contour of the protective body 310 facing the support surface 303 preferably is substantially equal to an outer contour of the support surface 303, preferably it is almost identical to this.

Preferably, the protective body 310 is made of a material 313 that is more air and dustproof compared to the air and dust permeable material 312, and more preferably of an air and dustproof material 313 '. The material 313, 313 'is preferably also stronger, in particular stiffer than the material 312, whereby the air and dust permeable material 312 of the support body 311 better against mechanical damage when using the holding body 300 after Fig. 2 can be protected.

The protective body 310 furthermore has a contact surface 314 lying substantially in one plane of the support surface 303. Preferably, the attachment layer 302 is connected to the protective body 310 at least on or on the abutment surface 314, in particular adhesively bonded and / or welded. The retaining surface 304 of the attachment layer 302 is in the preferred Design according to Fig. 2 at least almost completely, preferably completely connected to the contact surface 314, in particular adhesively bonded and / or welded.

According to Fig. 2 For example, a preferred connection surface 315 of the support body 301 opposite the support surface 303 of the support body 301 has a smaller surface area compared to the support surface 303, in particular a smaller outer diameter. The connection surface 315 is almost completely, preferably completely covered by a cover plate 316. In particular, the cover plate 315 extends radially up to a second contact surface 317 of the protective body 310 which is substantially opposite the contact surface 314, wherein the cover plate 316 covers the contact surface 317 radially at least partially, preferably almost completely. Preferably, the cover plate 316 is connected in the region of this overlap with the protective body 310, in particular glued and / or welded.

By the connection of the cover plate 316 with the protective body 310, in particular an advantageous guidance of a suction air flow 31 through the holding body 300 can be achieved. For this purpose, the cover plate 316 according to Fig. 2 at least two, preferably radially equidistant exhaust air holes 318, which - in an operation of the holding body 300 on a suitable grinding machine - a passage of Saugluftstroms 31 through the cover plate 316 substantially in the axial direction, ie substantially parallel to the direction 308 allow. By "radially equidistant" is meant in particular that the exhaust holes 318 in almost the same, preferably the same radial distance about a movement center 319 - for example, a rotation axis 319 a - of the holding body 300 are arranged. However, it may also be advantageous that only one or three, four or more exhaust holes 318 are provided. In particular, it may also be advantageous if the exhaust air hole 318 are not radially equidistant distributed over the cover plate 316.

A preferred cover plate 316 consists of a harder, more robust material than the support body 301 and in particular the support body 311, wherein the cover plate 316 preferably made of a plastic, such as at least one thermoset, thermoplastics and / or fiber reinforced plastic, and / or a Metal, in particular light metal or a light metal alloy.

On the preferred cover plate 316 of the example Fig. 2 Furthermore, a fastening device 320 is arranged, via which the holding body 300 can be connected to a grinding machine, not shown here. The fastening device 320 comprises in this example a threaded pin 320a and a retaining plate 320b, with which the threaded pin 320a is fixedly connected and which is itself connected to the cover plate 316 in a material, force and / or form-fitting manner. In the example below Fig. 2 For example, the holding plate 320b is connected to the cover plate 316 via rivet joints 320c. The skilled person, however, alternative or complementary fastening methods are known, which can also be used here as advantageous.

If a holding body 300 after the example of Fig. 2 with a grinder 10, as they are made, among others Fig. 1 is known, used and taken after preparation of a suitable abrasive 400 in operation, the impeller 16 generates a suction air 31, the dust laden with abrasive dust through the at least partially air and dust permeable abrasive 400 and the air and dust permeable attachment layer 302 of the holding body 300th sucked into the support body 301. In this case, the suction air flow 31 initially runs essentially parallel to the direction 308, ie almost perpendicularly through the attachment surface 305, the attachment layer 302 and the support surface 301. After penetration of the suction air flow 31 into the support body 301, in particular into the support body 311, the suction air flow undergoes a deflection in a transverse direction, ie a deflection with at least one directional component perpendicular to the direction 308 Fig. 2 the suction air stream 31 is bundled in its way through the support body 311 in the direction of the exhaust holes 318 in the cover plate 316 back so that the suction air stream 31 again almost parallel to the direction 308 passes through the exhaust ports 318. Now, the suction air flow 31 continues its already known path through the grinding machine 10. Overall, however, the suction air flow 31 experiences a much gentler deflection during its passage through the holding body 300, ie a deflection with larger radii of curvature than in holding bodies 30 according to the prior art, so that the holding body 300 advantageously contributes to less vortex formation and increased suction power. In addition, the holding body 300 allows the suction of a suction as evenly as possible over the Distribute mounting surface 305, so that the extraction of sanding dust can be done as fully as possible.

Fig. 3 shows a further development of a holding body 300 according to the invention, as it Fig. 2 already known. In the following, only the closer to the deviations will be discussed. Features that are designed to be equivalent to the example described above are denoted by identical reference numerals.

The holding body 300 after Fig. 3 includes a support body 301 with a mounting layer 302 similar to the embodiment of FIG Fig. 2 , The support body 301 consists of a substantially air and dust-proof material and has at least one, preferably two or more radially distributed over the disc-shaped cross-sectional surface of the support body 301 Saugluftbohrungen 330 to provide an air and dust permeability. The Saugluftbohrungen 330 connect the terminal surface 315 with the area of the support surface 303. Analogous to example according to Fig. 2 At the connection surface 315, a cover plate 316 is provided, which has exhaust air bores 318. Does the support body 301 similar to the first embodiment after Fig. 2 At least partially from an air- and dust-permeable, in particular open-pore material 312 can be dispensed with the Saugluftbohrungen 330.

The support body 301 according to Fig. 3 Further, in a region 331 adjoining the support surface 303, there is a dust space 332, into which the suction air bores 330 in particular open. In this case, the dust space 332 preferably extends substantially parallel to the support surface 303. The dust space 332 is structured in a knobbed and / or honeycomb-like manner. Fig. 4 shows a plan view of the support surface 303 and the dust chamber 332 of a support body 301 according to the invention according to the example of Fig. 3 , wherein the dust chamber 332 is knob-like structured by projecting from the rest of the support body support projections 333, which at least partially protrude into the support surface. The protruding into the support surface 303 parts of the support projections 333 preferably form parts of the support surface 303. The dust chamber 332 forms in this example still a coherent space itself.

Analogous to the knob-like support projections 332 of the dust chamber 332 is also honeycombed segmented by channels, grooves and / or wall pieces, wherein Interruptions in the channels, grooves and / or wall pieces ensure that the dust space 332 extends substantially as an open space over a contiguous region of the support surface 303. However, it may also be advantageous to subdivide the dust chamber 332 into individual dust compartment sections, which do not have any cross-connection with one another.

The dust chamber 332 in the support body 301 of the holding body 300 after Fig. 3 is covered in the direction of the support surface 303 by the attachment layer 302 according to the first embodiment or closed air and dust permeable. Advantageously, the attachment layer 302 is connected to the projecting into the support surface 303 parts support projections 333, channels, grooves and / or wall pieces, in particular glued and / or welded.

Deviating from the execution according to Fig. 2 the fastening device 320 is designed as a fastening screw 321, which is guided through a central bore 322 in the holding body 300 and a feedthrough bore 323 in the cover plate 316 and with which the holding body 300 according to the invention can be connected to a grinding machine 10.

If an inventive holding body 300 after the example of Fig. 3 with a grinder 10, as they are made, among others Fig. 1 is known, used and taken after preparation of a suitable abrasive 400 in operation, the impeller 16 generates a suction air stream 31, the laden with grinding dust air through the at least partially air and dust-permeable abrasive 400 and the air and dust-permeable attachment layer 302 of the holder body according to the invention 300 in the dust chamber 332 of the support body 301 sucks. In the dust chamber 332, a deflection of the suction air flow 31 takes place analogously to the example Fig. 2 , wherein in the embodiment according to Fig. 3 Although tighter radii of curvature must be adhered to than in the example according to Fig. 2 However, the open design of the dust chamber 332 also ensures an effective deflection of dust particles with larger dimensions towards the Saugluftbohrungen, which effectively prevents clogging of the holding body 300 according to the invention.

Fig. 3 moreover shows a further development of the holding body 300 according to the invention as dashed drawing portions. In this case, one or more fresh air lines 334 are provided in the support body 301, which an air flow 335 via not shown Zuluftöffnungen from a holding body 300 enclosing Surround by the support body 301 in the vicinity of a processing zone 336 conduct. In particular, it is provided that fresh air bores 337 open into the central bore 322, so that the air flow 335 can at least partially overflow a central region of the processing zone 336.

Fig. 5 shows an alternative or additional development of a holding body 300 according to the invention, as it Fig. 2 and or Fig. 3 already known. In the following, only the closer to the deviations will be discussed. Features that are designed to be equivalent to the example described above are denoted by identical reference numerals.

Analogous to the example from Fig. 3 is the support body 301 of a substantially air and dust-proof material and has to provide an air and dust permeability at least one, preferably two or more radially distributed over the disc-shaped cross-sectional surface of the support body 301 Saugluftbohrungen 330.

In contrast to the previous example, however, the support body 301 consists of at least a first support body part 301A and a second support body part 301B, wherein the at least two support body parts 301A, 301B are preferably fixedly connected to each other and thus form the support body 301. A connection of the at least two support body parts 301A, 301B can be effected in particular by gluing, welding or another cohesive connection and / or by a positive and / or non-positive connection, such as, for example, screws, clamps or latches.

The first support body part 301A in this case has the connection surface 315 and, on the other hand, provides an inner dust chamber 332 via a recess 338 facing the second support body part 301B. The dust space 332 is thereby completed after the connection of the second support body part 301B with the first support body part 301A through an interface 339 of the second support body part 301B - in the sense of "largely separated from the rest of the environment". Alternatively, the recess 338 may also be provided in the second support body part 301B and the interface 339 in the first support body part 301A. It is also conceivable that a recess 338 is provided in each of the support body parts 301A, 301B, which form the dust space 332 after the joining of the two support body parts 301A, 301B.

The second support body part 301B furthermore has a plurality of dust air holes 340, which connect the air- and dust-permeable attachment layer 302, which is arranged on the support surface 303 opposite the boundary surface 339, to the interface 339 so as to be permeable to air and dust.

In a holding body 300 after Fig. 5 the advantageous deflection and / or bundling of the suction air flow 31 substantially dust chamber 332 takes place. Otherwise, the holding body 300 corresponds to Fig. 5 in its effect the examples described above, to the description of which reference is made.

Notwithstanding the preceding description of the example according to Fig. 5 However, it can also be provided that the second support body part 301B wholly or partly from the air and dust-permeable material 312 according to the example according to Fig. 2 exists, so that preferably can be dispensed with the dusty air holes 340, which may advantageously favor a more uniform surface distribution of the Saugluftstroms 31 on the mounting surface 305.

Other embodiments, the skilled artisan, inter alia, by advantageous combinations of the above-described individual embodiments and developments. In particular, the combination with suitable fresh air ducts and / or bores can be transferred by the person skilled in the art to the other exemplary embodiments.

A particularly advantageous variant can result, for example, from the fact that a support body 311 as in the example according to Fig. 2 known from a first support member 311A and a second support member 311B similar to the structure of the support body 301 after Fig. 5 in particular, at least one, preferably both support body parts 311A, 311B consist of the air- and dust-permeable material 312. Preferably, the support body parts 311A, 311B become similar to the embodiment by a protective body 310 Fig. 2 enclosed. In addition, preferably, at least one recess 338 for forming a dust chamber 332 similar to the embodiment according to Fig. 5 be provided in at least one of the support body parts 311A, 311B.

The Figures 6a and 6b show in addition an abrasive 400, in particular flexible abrasive 400, which further favors the effect of the holding body 300 according to the invention. The abrasive 400 comprises a, a working surface 401 substantially covering working layer 402, an air and dust-permeable carrier layer 403 and a connecting layer 405 having connecting means 404 cooperating with the fastening means 306 of the holder body 300 for fastening the abrasive 400 on the holding body 300. The connecting layer 405 thereby provides a connecting surface 406 which is substantially remote from the working surface 401. Furthermore, the connection layer 405 is formed so that the connection surface 406 is substantially permeable to air and dust in a direction substantially perpendicular to the connection surface 406.

Will a preferred abrasive 400 after Fig. 6a, 6b attached to a holding body 300 according to the invention according to one of the embodiments described above and put into operation in a grinding machine 10, the impeller 16 generates a suction air stream 31, the air laden with grinding dust along the direction 308 of the working surface 401, through the air and dust-permeable carrier layer 403 sucks into the air and dust-permeable connection view 405 and from there into the air and dust-permeable attachment layer 302 of the holding body 300 according to the invention in the support body 301 sucks. According to the invention, the suction air flow 31 initially runs essentially parallel to the direction 308, ie almost perpendicularly through the carrier layer 403, the common layer of connecting layer 405 and fastening layer 302 and the support surface 301. In the following, the suction air flow 31 follows the above-described paths, to the description of which reference is made. The abrasive 400 according to Fig. 6a, 6b further comprises an optional, central bore 407, which in particular with a holding body 300, which has at least one opening into the central bore 322 fresh air line 334, may be advantageous. The abrasive 400 according to the invention can also be advantageously used on a holding body 30 according to the prior art, since here, too, relative to the dust extraction openings 29 in the holding body 30 can advantageously remain unnoticed when applying an abrasive 400. For this purpose, the abrasive 400 merely has to have a connecting layer 405 with connecting means 404, which can cooperate with fastening means of the holding body 30 in such a way that the abrasive 400 adheres to the fastening surface of the holding body 30, advantageously removably adheres.

Alternatively, an already known flexible abrasive 400 ', which has a plurality of over the work surface 401' distributed, the abrasive 400 ' piercing suction holes 408 ', are advantageously used on a holding body 300 according to the invention. An alignment of the suction holes 408 'relative to the mounting surface 305 is advantageously without effect on a suction when attaching such an abrasive 400'. The abrasive 400 'only has to have a connecting layer 405' with connecting means 404 ', which can cooperate with the fastening means 306 of the holding body 300 according to the invention such that the abrasive 400' adheres to the mounting surface 305, advantageously releasably adheres.

In addition to the embodiments and application examples of a holding body 300 according to the invention described here in detail with reference to an eccentric grinder, a number of further grinding machines with suction devices are known to the person skilled in the art, both with substantially circular holding body 300 - for example orbital sander and polishing machines - and those with polygonal, in particular Have substantially triangular, rectangular or trapezoidal holding body 300a. The person skilled in the art will be able to transfer the disclosed emptiness with ease to a grinding machine with polygonal, in particular substantially triangular, rectangular or trapezoidal holding body 300a. An advantageous, inventive deflection of the air flow through the holding body 300a can also be achieved by simple modification of the holding body geometry for these holding bodies 300a, without having to change parts of the described embodiments that are essential to the invention. Such holding body 300a should therefore be explicitly included in the application.

Claims (16)

1. Retaining body (300, 300a) for a grinding means (400), in particular a grinding disk (220), comprising a fastening layer (302) with a fastening surface (305), having fastening means (306), for fastening of a flexible grinding means (400), and comprising a support body (301) with a support surface (303), which latter supports a retaining surface (304), in particular lying opposite the fastening surface (305), of the fastening layer (302), in particular is connected thereto, wherein the support body (301) is air and dust permeable, in particular consists of an air and dust permeable material (312), wherein the fastening layer (302) is configured such that the fastening surface (305), in a direction (308) running substantially perpendicular to the fastening surface (305), is substantially air and dust permeable, so that, in particular, an air flow (31) can pass from the fastening surface (305), substantially perpendicular to the fastening surface (305), through the fastening layer (302), characterized in that the support body (301) has a dust chamber (332, 338), which is preferably provided in a region (331) adjacent to the support surface (303), wherein the dust chamber (332), from the perspective of the support surface (303), has a knobbed and/or honeycombed structurization, which is permeated by ducts, channels and/or grooves for guidance of an air flow.
2. Retaining body (300, 300a) according to one of the preceding claims, characterized in that an air flow (31) running substantially perpendicular to the fastening surface (305), in particular a dustcontaining air flow, after having passed through the fastening layer (302), undergoes at least a partial diversion into a crossflow through the support body (301), which crossflow runs, from the perspective of the grinding means (400), substantially behind the fastening layer (302).
3. Retaining body (300, 300a) according to Claim 1 or 2, characterized in that the fastening means (306) are configured as mechanical fastening means for fastening of a flexible grinding means (400), in particular as loops and/or hooks protruding from the fastening surface (305).
4. Retaining body (300, 300a) according to one of the preceding claims, characterized in that the fastening layer (302) contains, or consists of, an open-pore material (312).
5. Retaining body (300, 300a) according to one of the preceding claims, characterized in that the fastening layer (302) contains, or consist of, a textile material (312), in particular a textile material (312) having loops and/or hooks and/or mushroom heads.
6. The retaining body (300, 300a) according to one of the preceding claims, characterized in that the fastening layer (302) almost fully covers the fastening surface (305).
7. Retaining body (300, 300a) according to one of the Claims 2 to 6, characterized in that the diversion of the air flow takes place substantially in the dust chamber (332, 338).
8. Retaining body (300, 300a) according to Claim 6 or 7, characterized in that the support body (301) has at least one suction air bore (330), which in an air and dust permeable manner connects the dust chamber (332) to a surface lying opposite the support surface (303) and through which air can be extracted from the dust chamber.
9. Retaining body (300, 300a) according to one of Claims 6 to 8, characterized in that the support body (301) has at least one fresh air line (334), via which an air stream can be conducted into a region in front of the fastening layer (302) of the retaining body (300, 300a).
10. Retaining body (300, 300a) according to one of Claims 6 to 9, characterized in that the knobbed and/or honeycombed structure of the dust chamber (332) is formed substantially by supporting projections (333) which protrude from the rest of the support body (301) and which jut at least partially into the support surface (303), so that those parts of the supporting projections (333) which jut into the support surfaces (303) form parts of the support surface (303), wherein the fastening layer (302) is preferably connected, in particular bonded and/or welded, to these parts of the support surfaces (303).
11. Retaining body (300, 300a) according to one of the preceding claims, characterized in that the support body (301) has a connection surface (315) lying substantially opposite the support surface (303), wherein the connection surface (315) has a smaller surface area, in particular a smaller outer diameter, than the support surface (303), and wherein preferably at least one extraction opening (318) is provided in the connection surface (315).
12. Retaining body (300, 300a) according to Claim 11, characterized in that the support body (301) has at least a supporting element (311) and a cover plate (316), wherein the supporting element (311) extends between the support surface (303) and the cover plate (316) and is air and dust permeable, in particular consists of an air and dust permeable material (312), and wherein the cover plate (316) substantially covers or forms the connection surface (316).
13. Retaining body (300, 300a) according to Claim 11 or 12, characterized in that the support body (301) has a protective element (310), preferably is radially enclosed by the latter, wherein a radial outer contour, facing toward the support surface (303), of the protective element (310) substantially resembles an outer contour of the support surface (303), preferably is almost identical thereto.
14. Retaining body (300, 300a) according to Claim 13, characterized in that the protective element (310) has a contact surface (317), which lies in a plane of the support surface (303), wherein the fastening layer (302) is connected, in particular bonded and/or welded, at least at the contact surface (317), to the protective element (310).
15. Grinding system comprising at least one retaining body (300, 300a) for a flexible grinding means, in particular a grinding disk (220), according to one of Claims 1 to 14, and at least one grinding means (400, 400'), preferably an at least partially air and dust permeable grinding means, which can be fastened to the fastening surface (305) of the retaining body (300).
16. Grinding machine (10), in particular a hand grinder, comprising at least one retaining body (300, 300a) according to one of Claims 1 to 14 and a drive unit (11a) for driving the at least one retaining body (300, 300a).

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