Covering body for a grinding disc, grinding disc and grinding machine

Abstract

The invention relates to a grinding disc (40) for a grinding machine (15), with a drive bracket (49) arranged on its machine side (41) for rotationally fixed attachment to an output (26) of the grinding machine (15), so that the grinding disc (40) can be driven by the grinding machine into a grinding motion suitable for grinding a workpiece (W), in particular a rotary and / or eccentric motion, wherein the grinding disc has a machining side (42) opposite the machine side (41) with a machining surface (45) on which an abrasive (90) for abrasive machining of a workpiece (W) can be fixedly or detachably arranged by means of an adhesive layer (66), wherein inlet openings (48) for the inflow of dust-laden air (S) are arranged on the machining surface (45) and outlet openings (43) connected to these via through channels (59) are arranged on the machine side (41).wherein the outlet openings (43) are arranged in an extraction zone (44) within an annular sealing element (80) arranged on the machine side (41) for sealing against a counter-seal element (36) of the grinding machine, wherein the grinding disc has a plate body (50) which has a support wall (54) provided for carrying the grinding medium (90), which is stiffened by a rib structure (55) whose ribs (56) project in front of the support wall (54) towards the machine side (41), wherein the ribs (56) define cavities (57) towards the machining side (42) which are closed by the support wall (54) and open towards the machine side (41). The invention further relates to a grinding machine which has such a grinding disc. It is provided that the sealing element (80) covers at least a part of the cavities (57) towards the machine side (41).

Description

[0001] The invention relates to a cover body for a grinding disc or provided as a component of a grinding disc, wherein the grinding disc is designed in particular according to one of the preceding claims, wherein the cover body is designed as a cushion and has a support wall body and a working wall body, between which an elastic and / or compliant cushion body is held in a sandwich-like manner, wherein the support wall body and the working wall body have flat sides facing away from each other, the flat side of the support wall body being provided and designed to abut one or the plate body of the grinding disc, and the flat side of the working wall body having an abrasive or an adhesive layer for the releasable attachment of an abrasive, wherein it is provided that the working wall body and the support wall body are connected to each other at an outer circumference of the cover body by a connecting device.so that the cushion body is protected against mechanical damage by the support wall body, the processing wall body and the connecting device on the outer circumference of the cover body.

[0002] Such a cover body is described, for example, in CA 1 053 005 A.

[0003] According to the invention, a cover body is provided in accordance with claim 1.

[0004] A fundamental principle is that the cover body is reinforced at its edges, i.e., around its circumference, by the connecting device, which in any case covers the cushion body. Thus, the cushion body is enclosed in a chamber, which is provided on the one hand by the support wall body and the machining wall body on opposite sides of the cushion body, and on the other hand circumferentially by the connecting device. The connecting device therefore preferably forms a reinforcement of the cover body at its outer circumference.

[0005] It should be mentioned here that an outer circumference of the cover body is preferably essentially identical in contour to an outer circumference of the plate body or disc body of the grinding disc.

[0006] It is preferred that the support wall body and / or the processing wall body are made of a different and / or more tensile-resistant material than the cushion body. Thus, the cover body and the processing wall body provide a tensile-resistant, protective shell for the cushion body.

[0007] The pillow body is preferably made of foam, for example polyurethane foam or similar materials. Therefore, the pillow body is elastic and flexible.

[0008] It would also be conceivable to have an embodiment in which the support wall body is not present, i.e., that the cushion body rests directly against the plate body, for example a supporting wall of the plate body, and the plate body is connected to the processing wall body by the connecting device.

[0009] The pillow body consists, for example, of a single foam material or a combination of at least two foam materials.

[0010] The support wall body and / or the processing wall body are preferably made of a textile material. In particular, the support wall body and / or the processing wall body are more densely woven or less porous than the cushion body. Compared to the cushion body, the support wall body and the processing wall body are thin; for example, the cushion body is at least twice as thick, preferably at least three times as thick, as the support wall body and the processing wall body.

[0011] Preferably, the textile material of the support wall body and / or the processing wall body is reinforced, for example by polyamide fibers.

[0012] According to the invention, the connecting device comprises a seam or mutually spaced connecting elements, for example rivets or the like, or is formed by a seam or rivets. The seam or the connecting elements are, for example, angularly spaced from one another. The seam or the connecting elements connect the support wall body and the machining wall body, for example, directly to each other.

[0013] However, it is also possible that at least a section of the cushion body is penetrated by the joining device, for example, the seam, connecting elements, and the like, so to speak, between the support wall body and the working wall body. It is preferred if the cover body is hemmed with the seam on its outer circumference. However, it is also possible that the seam is sewn through the respective front faces or flat sides of the support wall body and the working wall body.

[0014] A material-bonded connection is also possible. In this case, the joining device includes a material-bonded connection, such as a welded joint and / or an adhesive bond. The material-bonded connection joins the support wall body and the processing wall body together, for example, directly. However, it is also possible in this case that, for example, an intermediate layer or a section of the cushion body is bonded or welded between the support wall body and the processing wall body, with the welding making the material of the cushion body stiffer and more resilient on its outer circumference. Alternatively or additionally to an adhesive bond, an ultrasonic welding connection, for example, can also be used.Furthermore, the connecting device can be formed by a material vulcanized onto the machining wall body and the support wall body, which simultaneously creates a material-bonded connection between the two wall bodies.

[0015] A further advantage is a ring-shaped connecting element that at least partially surrounds the outer circumference of the cover body. For example, the ring-shaped element can enclose the cover body in a clamp-like manner.

[0016] The ring body comprises, for example, at least one circumferential wall or circumferential wall section that covers the cushion body on the outer circumference of the cover body. It is further advantageous for the ring body to have one or more, for example, two, leg sections against which a respective flat side of the support wall body, a flat side of the machining wall body, or the plate body of the grinding wheel is supported. For example, the support wall body, the machining wall body, and the plate body can be supported between opposing legs or between legs of the ring body. Thus, the ring body can also support the plate body.

[0017] The ring body has, for example, a clamping opening or a slot that allows it to be attached to the cover body. Longitudinal ends of the ring body, between which the clamping opening or slot is located, can be movable towards each other to enclose the cover body. Alternatively, several ring segments can be joined together to form the ring body, or the ring body can comprise several ring segments. Preferably, the ring body completely or substantially encompasses the outer circumference of the cover body, so that the latter is protected as completely as possible around its circumference by the ring body.

[0018] The ring body can clamp the machining wall body to the support wall body and / or the plate body. For example, the ring body can be designed as a bent part.

[0019] It is also possible that the ring body comprises opposing ring bodies, connected in particular by rivets, bolts, or similar connecting elements, between which the machining wall body and the support wall body are sandwiched together. Furthermore, it is possible that a section of the plate body, for example, an outer edge section of the plate body, engages between these ring bodies.

[0020] The at least one ring body can also comprise or be formed by a ring body that is arranged between the support wall body and the machining wall body, or that has a section arranged between the support wall body and the machining wall body. For example, the ring body can surround the cushion body radially on the outside or on the outer circumference of the cover body.

[0021] The support wall body and / or the processing wall body are advantageously made of a material that is more impact-resistant and / or denser and / or harder than the cushion body.

[0022] The ring body, which is arranged sandwich-like between the support wall body and the working wall body, preferably consists of a material that is stronger in tensile strength, impact resistance, and / or density than the cushion body. Furthermore, this ring body can also be made, for example, of a foam material or a porous or flexible material. However, this material is preferably less porous, stronger, harder, or all of these properties combined than the cushion body.

[0023] The ring body can also be elastic and deformable by a force acting on the machining wall body in the direction of the support wall body. For example, the ring body consists at least partially of rubber or elastic plastic. The ring body can be manufactured, for example, by vulcanization or be vulcanized to the cover body, for example, the support wall body and / or the machining wall body. Thus, the ring body preferably forms a wall body that radially covers the cushion body on the outside or on the outer circumference of the cover body.

[0024] The cover body advantageously has a large central area in which the cushion body is arranged and around which the connecting element extends. Preferably, there is no connection penetrating the cushion body between the machining wall body and the support wall body in the central area. The advantage of this is that the cushion body exhibits its full elasticity in the central area, meaning that, for example, it ensures that the abrasive material arranged on it rests flat against the workpiece being machined.

[0025] Furthermore, it is advantageous if the machining wall body has a large central area in which it projects further forward of the support wall body and / or the plate body than at the outer circumference of the cover body. A recess is created there, for example, by the connecting device. However, this recess is advantageously continuous rather than stepped. Therefore, the cover body preferably has a convex or cushion-like shape in the area of ​​the machining wall body.

[0026] On the flat side of the workpiece, inlet openings for dusty air are advantageously arranged, which are connected to outlet openings on the flat side of the support wall body via through channels. Dusty air can flow through the cover body via these through channels. When mounted on the grinding wheel's plate body, the outlet openings of the cover body communicate with inlet openings of the plate body, which in turn are connected via through channels to outlet openings on the machine side of the grinding wheel.

[0027] While it is possible for the cushion body to extend all the way to the outer circumference of the cover body and / or to the connecting element, it is also possible for a cavity—essentially air—enclosed by the support wall body and the machining wall body, to be arranged between the cushion body and the outer circumference of the cover body. Preferably, this cavity is designed as an annular space.

[0028] The cover body with its edge-mounted connection offers a particular advantage, especially in conjunction with eccentric sanders, i.e., where the sanding disc performs an eccentric or at least non-rotatory movement. If the edge of the sanding disc comes into contact with a workpiece or other obstacle, the connection protects the cover body from damage.

[0029] Advantageously, a grinding disc for a grinding machine is provided with a drive bracket arranged on its machine side for rotationally fixed attachment to an output of the grinding machine, so that the grinding disc can be driven by the grinding machine into a grinding motion suitable for grinding a workpiece, in particular a rotary and / or eccentric grinding motion, wherein the grinding disc has a working side opposite the machine side with a working surface on which an abrasive for abrasive machining of a workpiece can be fixedly or detachably arranged by means of an adhesive layer, wherein inlet openings for the flow of dust-laden air are arranged on the working surface and outlet openings connected to these via flow channels are arranged on the machine side, wherein the outlet openings are located in an extraction zone within an annular,The sealing element is arranged on the machine side for the sealing connection of a counter-sealing element of the grinding machine, wherein the grinding disc has a plate body which has a support wall provided for carrying the grinding medium, which is stiffened by a rib structure, the ribs of which project in front of the support wall towards the machine side, wherein the ribs define cavities on the machining side which are closed by the support wall and open towards the machine side.

[0030] The grinding disc is provided that the sealing element covers at least part of the cavities towards the machine side and that a cover body according to claim 1, having the machining surface and in particular closing recesses on the plate body, is arranged on the support wall.

[0031] A key design principle of the grinding disc is that the ribbed structure is also present in the area of ​​the sealing element, for example, the raceway for the counter-seal of the grinding machine, with the gaps between the ribs being covered by the sealing element. Thus, the disc body and ultimately the grinding disc itself are reinforced by the ribbed structure even in the area of ​​the sealing element or at the radial distance between the sealing element and the drive mount. The sealing element is located there.

[0032] Cavities of the plate body that are closed or covered by the sealing element are in particular such cavities that are closed to the radially outer edge region of the plate body by the material of the plate body.

[0033] The plate body preferably forms a hard component of the grinding disc that stiffens the grinding disc.

[0034] The plate body preferably does not consist of a foamed material and / or foam.

[0035] The plate body is preferably made of a hard plastic or metal.

[0036] The plate body is advantageously harder and / or more rigid in relation to a cover body arranged on the processing side, for example a grinding pad.

[0037] The rib structure is preferably integral with the wing wall. However, it is also possible that the rib structure is glued, injection-molded, cast, or similarly attached to the wing wall.

[0038] It is advantageous if the grinding disc is manufactured in such a way that the sealing element forms a first component and the supporting wall, which has the rib structure, forms a second component of the grinding disc, which are or will be connected to each other.

[0039] Therefore, the rib structure already present on the supporting wall is at least partially covered by the sealing element during the manufacturing of the grinding disc.

[0040] It is advantageous if the plate body has additional ribs at a radially outer edge region with respect to the drive mount, in particular ribs radiating outwards from a center point of the plate body or grinding disc. Such ribs can, for example, serve a stiffening function. It is also possible for the ribs to form flow channels. Recesses are provided between these ribs, which are advantageously not covered by the sealing element. The radially outer edge region of the plate body is advantageously not covered by the sealing element.

[0041] The sealing element can, for example, be plate-like. However, it is also possible that the sealing element contains a sealing sleeve or part of a sealing sleeve. Thus, the sealing element or the counter-sealing element, or both, can be designed as a sleeve or other flexible sealing element.

[0042] During operation of the grinding machine, the sealing element and the counter-sealing element are in contact with each other in a sealing fit, so that the extraction zone is enclosed or chambered by the sealing element and the counter-sealing element.

[0043] Preferably, the sealing element covering the cavities on the machine side is the only sealing element for sealing contact with the or a counter-sealing element of the grinding machine.

[0044] The plate body and / or the sealing element are preferably essentially rigid, especially when arranged together.

[0045] The sealing element preferably has a sealing surface for contact with the counter-sealing element, which is designed as a flat or planar surface. The sealing surface and the machining surface are preferably parallel to each other.

[0046] The sealing element preferably comprises a ring body and / or plate-shaped or wall-like bodies.

[0047] The plate body and / or the sealing element are advantageously made of metal and / or a thermosetting plastic. The plate body and / or the sealing element can be made of a fiber-reinforced material, e.g., a plastic reinforced with glass fibers and / or carbon fibers.

[0048] The plate body is preferably designed on the machine side such that, without the sealing element at least partially covering the cavities, it has no sealing surface, in particular no annular sealing surface extending around the drive bracket, for sealing contact with the counter-sealing element of the grinding machine. However, it is fundamentally possible for the plate body to have, in addition to the sealing element covering the cavities, at least one additional sealing surface or sealing contour, in particular annularly extending around the drive bracket, for sealing contact with a counter-sealing element of the grinding machine.

[0049] Both the sealing element and the counter-sealing element can be hard components, soft components, or both. It is particularly advantageous if the sealing element is plate-shaped or flat, i.e., the component located on the grinding wheel has a plate-like or track-like shape. The counter-sealing element is preferably designed as a sealing sleeve or sealing collar, which is arranged, for example, on the tool holder of the grinding machine, which can be brought into engagement with the drive mount of the grinding wheel. For example, the tool holder of the grinding machine is located, in particular, centrally within the counter-sealing element and is surrounded by it in an annular manner. Naturally, this configuration is also advantageous for the grinding wheel, i.e., the drive mount is located centrally in the area of ​​the sealing element or at its center.

[0050] The sealing element and the plate body can be a single piece. For example, the sealing element is injection-molded onto the plate body or manufactured in one piece, for example by an injection molding process.

[0051] A preferred concept provides for the plate body and the sealing element to be separate but permanently connected components. This connection can be permanent, such as a weld, adhesive bond, or similar. Alternatively, it can be detachable, such as a snap-fit, clamp, positive-lock, or adhesive bond using a removable adhesive. However, the sealing element remains fixed to the plate body during operation of the grinding wheel or for the operation of the grinding wheel.

[0052] At least one cavity of the plate body, covered by the sealing element of the grinding wheel on the machine side, is advantageously a demolding cavity formed by removing a casting core from the cavity. The plate body is manufactured, for example, using a die and a core. The die ultimately defines the shape of the supporting wall, while the core is required to form the rib structure. The casting cavity, in which the plate body forms during casting or injection molding, is provided between the die and the core. When the core is removed from the die, i.e., when the plate body is removed, the cavities between the ribs of the rib structure are created.

[0053] Advantageously, the sealing element covers and / or tightly seals all cavities of the plate body within the suction zone and / or on a flat surface of the plate body between the drive mount and an edge region of the plate body. For example, the plate body may have additional ribs on its outer or radially outer surface relative to the drive mount or the sealing element, which are not covered or overlapped by the sealing element. The edge region preferably has a conical or sloping profile. The edge region preferably rises from the outer edge of the plate body to the area where the sealing element is located.

[0054] This is possible if the sealing element covers all cavities, or at least a large proportion of them, of the plate body, apart from the outlet openings, and in particular seals them tightly. It is especially advantageous if the sealing element covers or seals all cavities of the plate body, apart from the outlet openings, that are not open radially outwards with respect to the drive mount of the plate body or grinding wheel.

[0055] It is particularly advantageous if the sealing element completely and / or tightly seals at least one, preferably several or all cavities.

[0056] A preferred concept provides that the sealing element, apart from the outlet openings, tightly seals at least a part of the cavities, preferably all cavities or a plurality of cavities, so that a volume located in the respective cavity is sealed or enclosed in a dust-tight manner.

[0057] Preferably, those cavities of the plate body that are closed by the sealing element are completely closed by the sealing element. Such a closed cavity is, for example, closed by the rib structure, wherein ribs of the rib structure form the circumferential walls of the cavity, and on opposite sides by the supporting wall and the sealing element. The sealing element and the supporting wall are connected to the ribs forming the circumferential walls in such a way that the cavity is completely closed.

[0058] Preferably, the sealing element covers and / or tightly seals at least one, several, or all of the cavities designed and configured to form one or more through-channels, and / or at least one or all of the through-channels themselves. It is possible that cavities located away from the through-channels are covered by the sealing element but not completely sealed. Even a cavity covered by the sealing element that is not tightly sealed, for example by welding or bonding, is protected against the ingress of dust.

[0059] Thus, the raw plate body initially contains cavities, which are covered or sealed by the sealing element. For example, the ribs and the supporting wall define the cavity on two, three, or four sides, and the sealing element closes at least one other side, such as a fourth, fifth, or sixth side. Therefore, it is advantageous if the sealing element, the supporting wall, and the ribs completely enclose or chamber a volume within one or more cavities. This prevents dust from entering the respective cavity during operation of the grinding wheel. Consequently, the mechanical properties, such as the balancing or smooth running of the grinding wheel, remain unchanged or are at least not altered by dust that could otherwise become trapped in the cavity.

[0060] It is preferred that the sealing element rests flat on the end faces of the ribs of the rib structure facing the sealing element. This makes it possible, for example, to contain volumes within a given cavity.

[0061] It is also advantageous if the sealing element is connected to the plate body, for example the ribs, especially their end faces, by means of welding, for example thermal welding, ultrasonic welding or the like. However, bonding can also be used instead of or in addition to welding.

[0062] Therefore, a permanent connection between the sealing element and the plate body is advantageous.

[0063] For creating a weld, particularly a thermal weld, it is advantageous to provide so-called weld points or weld protrusions. It is advantageous, for example, if the sealing element and / or the plate body have at least one weld protrusion, such as a weld point, weld rib, or the like, for welding to the other component of the plate body and sealing element, or if they are connected to each other by means of such a weld protrusion. The weld protrusion can, for example, be designed as a narrow burr. The at least one weld protrusion can, for example, be a so-called energy direction indicator. During thermal welding, such as ultrasonic welding, the weld protrusion melts and thus ensures that the plate body and sealing element are welded together.

[0064] It is possible that the at least one weld protrusion has an elongated shape. However, the at least one weld protrusion can also, for example, comprise or be formed by an arrangement of several weld spots or point-shaped weld protrusions.

[0065] The at least one weld projection or a weld joint formed by the weld projection is, for example, frame-like in design or forms a frame. The at least one weld projection or a weld joint formed by the weld projection extends, for example, around an outlet opening of the plate body in such a way that the outlet opening is sealed against the environment, provided that the at least one weld projection or a weld joint formed by the weld projection tightly connects the sealing element to the plate body in the vicinity of the outlet opening. This prevents, for example, dust-laden air from the area of ​​the outlet opening from penetrating between the sealing element and the plate body.

[0066] The plate body and the sealing element are advantageously supported against each other in a force direction parallel to the machining surface or geometric plane of the machining surface. For example, the form-fitting contours of the plate body and the sealing element are in contact with each other. The form-fitting contours or surfaces can, for example, include form-fitting projections and receptacles on a portion of the plate body and the sealing element. This form-fitting support can, for example, absorb a torque that occurs between the plate body and the sealing element during operation with the grinding machine. Such a torque arises, for example, from friction of the counter-sealing element against the sealing element and / or from the grinding contact of the machining surface with a workpiece, in each case when the grinding wheel is driven by the grinding machine.

[0067] It should be mentioned here that the grinding machine can easily be a rotary grinding machine, meaning that the grinding disc is designed and intended for rotary, abrasive, or grinding of a workpiece. However, it is also possible for the grinding disc to be designed as an eccentric grinding disc and the grinding machine as an eccentric grinding machine. It is also possible for different operating modes to be adjustable, for example, by setting the grinding machine between a rotary principle, an eccentric drive principle, or a hypercycloidal rotary drive principle, i.e., eccentric rotary operation.

[0068] It is preferred that the sealing element is detachably arranged on the plate body, for example by means of clamping devices and / or locking devices and / or a releasable adhesive bond. Although the sealing element is a separate component from the plate body itself, it is detachably connected to the plate body. Thus, for example, if the sealing element or the plate body becomes worn, the respective worn component can be easily replaced.

[0069] The sealing element and the plate body are advantageously connected to each other by at least one pairing of a positive-locking projection and a positive-locking receptacle, wherein the positive-locking projection and the positive-locking receptacle extend transversely, for example perpendicularly, to the machining surface and engage with each other. The at least one positive-locking projection is, for example, a positive-locking pin and the at least one positive-locking receptacle is a positive-locking pin receptacle. Naturally, the positive-locking projection can also have a wall-like shape. The positive-locking projection can, for example, bear against a rib of the rib structure. A positive-locking receptacle is then formed between the ribs. It is possible that each positive-locking projection bears against a wall of a positive-locking receptacle, for example, against a rib of the rib structure, only in one direction of force.At least one pairing or an arrangement of several pairings of positive locking projections and positive locking receptacles can also serve as an assembly aid or temporary support, for example until a weld or bond is made between the sealing element and the plate body.

[0070] At least one positive locking projection is expediently provided as a locking pin or locking projection. The at least one positive locking receptacle expediently includes a locking receptacle.

[0071] The at least one positive-locking projection can also be a plug-in projection, and the at least one positive-locking receptacle can be a plug-in receptacle. The plug-in projection can be inserted into the plug-in receptacle along a plug-in axis. Naturally, a plug-in receptacle can be designed as a snap-fit ​​plug-in receptacle, and a plug-in projection as a snap-fit ​​plug-in projection.

[0072] The plug receptacle and plug projection advantageously have interlocking surfaces extending transversely to the plug axis, hindering or preventing removal of the plug projection from the plug receptacle. These interlocking surfaces can, for example, be oriented obliquely to the plug axis or perpendicular to it. It is possible that the interlocking surfaces are normally spaced apart, particularly if the sealing element is already subjected to force in the direction of the plate body, especially by the counter-sealing element. However, it is preferred that the interlocking surfaces abut each other, so that the sealing element is held firmly against the plate body, even in the direction of the plug axis.

[0073] The plug-in projection advantageously has at least two plug-in segments, preferably three or four, which are movable relative to each other transversely to the plug-in axis. When the plug-in projection is inserted into the plug-in receptacle, the plug-in segments can be displaced towards each other and / or moved away from each other. For example, the plug-in segments can initially be displaced towards each other in the direction of the plug-in axis during insertion until a gap exists that allows the plug-in segments to move away from each other again. The aforementioned gripping surfaces are provided in this gap. The plug-in segments are formed, for example, by the plug-in projection having a slot extending in the direction of the plug-in axis, which penetrates a plane in which the plug-in axis is located.

[0074] Preferably, the sealing element has at least one support contour, for example a support recess and / or a support rib projecting from the sealing element, which is designed and configured for lateral contact with a rib defining a cavity. The support contour can also be, for example, a weld projection or be formed by one. This ensures that the sealing element and the plate body are supported against each other in a force direction parallel to the machining surface. In principle, it is also possible for the plate body to have a support contour, in particular a support rib, designed and configured for engagement with a counter-support contour of the sealing element, for example, for engagement with a support recess, groove, or the like on the sealing element.

[0075] Preferably, the sealing element has two spaced-apart support contours, for example, two spaced-apart support ribs or inner surfaces of a positive-locking recess, in particular a receiving groove, which are designed to abut opposing ribs that define a cavity or, for example, in the form of a receiving groove, define a recess for the engagement of a rib. Thus, the sealing element and the plate body are supported against each other in opposite directions of force parallel to the machining surface.

[0076] It is further preferred if the at least one support contour has at least two mutually perpendicular support contours, for example support ribs, for support against mutually perpendicular ribs. Thus, the sealing element and the plate body are supported against each other in mutually perpendicular force directions parallel to the machining surface.

[0077] An advantageous embodiment may provide that the at least one support contour comprises a support frame for lateral contact with an inner circumference of a cavity bounded by ribs, for example three, four, or five ribs. The ribs and legs of the support frame extend at angles to each other, for example triangular, quadrilateral, trapezoidal, or the like.

[0078] The at least one support contour can preferably form or comprise a welding projection for thermal welding, for example ultrasonic welding, of the sealing element to the plate body. However, it is also possible that the at least one support contour, for example, only ensures a positive-locking hold of the sealing element on the plate body and / or represents a support contour that is designed and configured for bonding the sealing element and the plate body.

[0079] It is generally possible for the sealing element to cover all or all cavities on the machine side that are located within the extraction chamber. Cavities located outside the extraction chamber can also be covered by the sealing element. It is even possible for the sealing element to cover all cavities located outside the extraction chamber.

[0080] A preferred design, however, is one in which the grinding disc has a cover element that covers at least some of the cavities on the machine side. Thus, both the sealing element and the cover element can each cover cavities on the machine side. A sandwich-like arrangement is also possible, meaning that both the cover element and the sealing element are positioned above each cavity. It is also possible for the sealing element, with the cover element in between, to cover at least some of the cavities that it would cover even without the cover element.

[0081] The cover element is preferably plate-shaped. The cover element is preferably designed as a ring body.

[0082] It is also possible that the sealing element and the cover element are integral or permanently joined together. Furthermore, it is possible that the sealing element encompasses or forms the cover element.

[0083] The cover element is preferably firmly attached to the panel body. For example, the cover element is held to the panel body by a positive fit and / or by means of the sealing element and / or by an adhesive bond, in particular a releasable adhesive bond, and / or by welding. Thus, the sealing element can, in effect, form a retaining element for the cover element. It is also entirely possible for the sealing element to be held to the panel body by means of the cover element, for example, by a positive fit. For instance, a portion of the sealing element can engage in a gap between the cover element and the panel body and thus be held to the panel body by the cover element.

[0084] The cover element advantageously has openings that can serve several purposes, for example, for positive locking elements that securely fix the sealing element and the plate body together, for the engagement of retaining contours of the sealing element (i.e., retaining projections arranged on the sealing element that engage into the openings), or for the flow of dusty air or for mounting the drive mechanism. The openings are preferably through-holes. However, it is also possible for the openings to be recesses or indentations, for example, for the engagement of retaining contours of the sealing element. Through-holes are not strictly necessary in these cases.

[0085] The sealing element preferably has retaining projections for holding the cover element to the plate body. The retaining projections preferably extend in a plane parallel to the machining surface. The retaining projections can include hook-like projections whose hook sections engage in the cover element, for example, in one of the aforementioned openings, which are designed as through-holes or recesses. The retaining projections can be radially outward, i.e., projecting away from the drive mount, but preferably in the direction of the drive mount. Particularly in the direction of the drive mount, namely in the extraction zone, it is advantageous if additional retaining projections hold the cover element to the plate body. The retaining projections can extend as far as the drive mount.

[0086] The sealing element and / or the cover element preferably completely or substantially cover cavities of the plate body in the area of ​​the extraction zone. Advantageously, only the outlet openings for the dusty air and / or the drive mounting are not covered by the sealing element and / or the cover element in the extraction zone.

[0087] The sealing element and the cover element are, for example, concentric and / or ring-shaped. Both the sealing element and the cover element can extend ring-shaped around the drive mount. Circular rings are also possible.

[0088] If the grinding disc has a shape other than circular, for example, a triangular or rectangular shape, it is advantageous if the sealing element and / or the cover element have a similar basic geometric contour to the plate body or the grinding disc. The aforementioned ring-shaped form of the sealing element and cover element can be a circular ring shape, but it can also be, for example, a triangular-ring or rectangular-ring shape.

[0089] The sealing element and / or the cover element expediently have an outer circumferential contour that correlates with the outer circumferential contour of the plate body or grinding disc, for example a round or annular outer circumferential contour, a triangular outer circumferential contour or a rectangular outer circumferential contour.

[0090] The cover element is preferably fixed to the plate body by the sealing element in a rotationally fixed manner with respect to an axis of rotation about which the plate body rotates during operation of the grinding machine. Form-fitting contours with which the sealing element and the plate body engage with each other preferably engage in a form-fitting manner with form-fitting recesses or form-fitting contours of the cover element.

[0091] The sealing element and / or a cover element that at least partially covers the cavities of the plate body, for example the aforementioned cover element, can be plate-like or wall-like.

[0092] It is possible that the sealing element has a higher mechanical strength and / or wall thickness than the cover element. For example, the cover element may be made of a foil-like material or a thin-walled material, while the sealing element, which is subjected to at least frictional stress from the counter-sealing element of the grinding machine during operation, has a higher flexural stiffness or strength than the cover element. For example, there may be a step between the sealing element and the cover element. This step is formed, for instance, by the sealing element having a greater material thickness than the cover element.

[0093] The sealing element and / or the cover element, or a cover element that at least partially covers the cavities of the plate body, for example both together, cover all cavities of the plate body on the machine side that are closed with respect to an outer circumference of the plate body between the machine side and the machining side, except for the exhaust openings for the dust air outside and / or inside the extraction zone. For example, further cavities may be provided radially outside or at the edge of the plate body that are not closed by the cover element or sealing element. For example, ribs of the rib structure are open at the edge or towards the outer edge of the grinding wheel and are not covered there by the sealing element or cover element.

[0094] At least some of the ribs of the plate body extend radially or radiating from the drive mount to an edge area of ​​the grinding disc. Transverse ribs or cross-bracing can, of course, be provided between these ribs.

[0095] Preferably, a portion of the ribs of the plate body defines a common support plane or surface in which the ribs support the sealing element and / or the cover element. This support plane is, in effect, an enveloping or common plane in which the ribs of the plate body form a support surface. The support plane can be a planar surface or flat plane. It is advantageous if all ribs or cavities of the plate body in the area of ​​the support plane are covered and / or closed by the sealing element and / or the cover element.

[0096] The support wall can be essentially a closed surface, but with inlet openings. Alternatively, the support wall may have recesses and indentations on the machining side, forming, for example, a ribbed structure. The support wall of the plate body, for instance, has recesses on the machining side to form the inlet opening and / or to provide at least sections of the flow channels. These recesses extend, for example, radially from an outer circumference of the grinding wheel to the drive mount and / or to the outlet openings located next to the drive mount.

[0097] The working surface of the grinding disc can be provided directly by the support wall. An adhesive layer for the abrasive or the abrasive itself can be arranged there. The abrasive comprises, for example, a non-abrasive fabric and / or an abrasive grain material, such as corundum. The abrasive is preferably a grinding sheet. The grinding disc is advantageously suited for attaching a grinding sheet to the working surface.

[0098] Furthermore, it is possible that a cover body is arranged on the supporting wall, which covers the supporting wall and, in particular, also closes any recesses in the plate body. The cover body may have flow openings or channels, as well as the inlet openings of the grinding wheel.

[0099] The cover body includes, for example, an elastic and / or flexible cushion body, such as a type of pad, or is formed by it.

[0100] Preferably, the cushion body is elastic and / or made of an airtight and / or dust-particle-impermeable plastic. For example, the cushion body is made of foam. In a preferred embodiment, the cushion body comprises or consists of polyurethane foam, in particular a polyester-based elastomeric foam and / or an aromatic PUR elastomeric foam. The cushion body is designed, for example, as a pad or cushion.

[0101] The cover body can completely or substantially completely cover the plate body on the machining side. Preferably, the cover body covers the plate body on the machining side except for an edge area removed from the drive mount and provided for the abrasive to engage behind it, and / or except for inlet or outlet openings for dust air. For example, there is no adhesive layer on the edge area, so that the abrasive, such as a sanding sheet, can be removed from the grinding wheel. Naturally, it is advantageous if the inlet openings on the machining surface are fluidically connected to and / or communicate with inlet or outlet openings of the cover body.

[0102] It is also possible for the cover element to be used on a different grinding disc, for example, a grinding disc that has no cavities and / or is not covered by a sealing element or a cover element, or both. In particular, it is possible that such a grinding disc has a plate body on which the cover element is arranged according to the following embodiment, but on which no special measures have been taken. However, it is advantageous if such a plate body has inlet openings and outlet openings that are interconnected by means of flow channels, so that dust-laden air flowing in at the machining side of the plate body can pass through the flow channels to the outlet openings, where it can be extracted by, for example, a dust extractor, a grinding machine, or the like.

[0103] It should also be mentioned that the abrasive is preferably a sanding sheet which can be removed from the sanding disc and can be held detachably on it.

[0104] The adhesive layer includes, for example, a component of a hook and loop fastener, such as a hook and loop layer or hook and loop fasteners, for the detachable attachment of the abrasive.

[0105] The abrasive can be attached directly to the cover body, for example, the sanding pad. However, it is also possible that the cover body has or carries the adhesive layer, for example, a hook and loop fastener, for the detachable attachment of the abrasive to the sanding disc.

[0106] The invention further relates to a grinding machine with a grinding wheel according to the invention and a counter-sealing element for bearing against the sealing element of the grinding wheel. The counter-sealing element comprises, for example, an elastic ring body made of an elastic material. However, the counter-sealing element can also be a plate-shaped body that slides along the sealing element. It is particularly advantageous if the counter-sealing element is resiliently compliant with respect to the sealing element on a housing of the grinding machine.

[0107] The grinding machine, for example, has a drive motor to power a tool holder to which the drive bracket of the grinding wheel can be detachably attached. The drive motor can be an electric motor, such as an electronically commutated or brushless motor, a universal motor, or the like. The drive motor can also be a pneumatic motor. A gearbox and / or an eccentric bearing for eccentric mounting of the tool holder relative to the drive motor's axis of rotation can be arranged between the tool holder and the drive motor.

[0108] InThe elastic ring body of the counter-seal element expediently incorporates one or more contact elements for abrasive contact with the sealing element of the grinding disc, wherein at least one of the contact elements is made of a material harder than the elastic material, for example, metal. Thus, the counter-seal element is wear-resistant.

[0109] The sealing element expediently has retaining pins, in particular several retaining pins spaced at an angle, which engage in pin recesses of the plate body.

[0110] By appropriately designing the cover element and / or sealing element, it is easily possible to individually adjust the dust extraction system of the sanding disc. The cavities of the sanding disc will not become filled with dust or other materials over time, which could negatively affect the running characteristics, smoothness of operation, or balance of the sanding disc.

[0111] The extraction or intake behavior of the dusty air can be adjusted by different designs of sealing elements, for example geometric designs and / or different materials.

[0112] Existing grinding discs or backing plates can be retrofitted with the sealing element. Different grinding disc variants can easily be produced by using different sealing elements.

[0113] The sealing element can easily be replaced if it becomes worn.

[0114] The material of the sealing element can be easily adapted to the properties of the counter-sealing element, for example its contact force, friction force or the like, so that matching material combinations of sealing element and counter-sealing element can be selected.

[0115] An embodiment of the invention is explained below with reference to the drawing. The drawing shows: Figure 1 is a perspective oblique view of a partially cut-away grinding machine with a grinding disc, which is shown in Figure 2 in an exploded view from an oblique top view as well as in detailed enlargements D2, D3 and D4 and in Figure 3 in assembly from an oblique top view; Figure 4 is an exploded view of the grinding disc according to the preceding figures approximately accordingly. Figure 2, however from a low angle and with detailed enlargements D5 and D6, Figure 5 the grinding wheel according to the preceding figures from a low angle, Figure 6 a top view of the grinding wheel of the preceding figures from a frontal top view, Figure 7 a partial section corresponding to a section D1, Figure 8 the partial section according to section D1, but along a section line BB in Figure 6 of section D1, Figure 9 an exploded view of the partially cut grinding machine according to Figure 1 with a grinding disc in a further embodiment, Figure 10, the grinding disc according to Figure 9 From a slightly oblique angle above, Figure 11 shows an exploded view of the grinding wheel according to Figure 10 From a slightly oblique angle above, Figure 12 shows an exploded view of the grinding wheel according to Figure 10, 11 from a slant below, Figure 13 shows an alternative sealing element for the grinding disc according to Figure 9-12 Figure 14 shows a section along a section line CC through the grinding wheel according to Figure 10Figure 15 shows a section along a section line DD through the grinding wheel according to Figure 10 Figure 16 shows a variant of the grinding disc according to the preceding figures, but with a cover element which is reinforced at its edge by a reinforcing device in a first embodiment; Figure 17 shows the grinding disc and in particular the cover body according to Figure 16 from a low angle, Figure 18, a detail D7 from Figure 17 Figure 19 shows a variant of the grinding disc according to Figure 16 with a smaller pillow body, roughly corresponding to detail D8 in Figure 16 Figure 20 shows a further cover body, a variant of a grinding disc and a cover body with a ring body as a connecting device, Figure 21 shows a section through the grinding disc according to Figure 20 , approximately corresponding to section D8 in Figure 16 , Figure 22 the grinding wheel according to Figure 20from an oblique angle above, but with an alternative ring body, Figure 23 a partial section through an edge area of ​​the grinding disc according to Figure 22 , approximately corresponding to detail D8, figure 24, a further grinding disc and a further cover body with an edge bonding or welding of the cover body, figure 25, a detail of the grinding disc and cover body according to Figure 24 , approximately corresponding to detail D8, Figure 26, another grinding disc and cover body with a stamped and bent part as a ring body and connecting device, of which a detailed section approximately corresponding to detail D8 is shown in Figure 27, another grinding disc and cover body from a slant below, of which a detailed section approximately corresponding to detail D8 is shown in Figure 29, another grinding disc and cover body from a slant below with an elastic edge protection, which is shown in detail in Figure 31 as a sectional view (approximately corresponding to detail D8).

[0116] A grinding machine 15 is used for grinding a workpiece surface, for example, a wall surface of a room, a mobile workpiece W, or the like. The grinding machine 15 can be gripped by a handle 16, which, unlike in the drawing, can be fixedly connected to a machine housing 20 of the grinding machine 15 or, as shown in the drawing, movably connected by means of a joint 17. The handle 16 can form an integral part of the machine housing 20 and protrude fixedly from it, unlike in the drawing. The handle 16, which is particularly rod-shaped, allows the grinding machine 15 to be guided along distant workpiece surfaces, for example, on ceilings or side walls of a room.

[0117] InA drive motor 25, for example an electronically commutated motor, a universal motor, or the like, is mounted in a motor section 21 of the machine housing 20. An output 26 of the drive motor 25 drives an eccentric bearing assembly 27, which rotatably supports a tool shaft 28 by means of one or more rotary bearings. The bearing assembly 27 has a tool holder 29 to which a grinding wheel 40 with its drive mount 49 can be detachably attached. The drive mount 49 and the tool holder 29 have, for example, corresponding screw contours, bayonet contours, or other fasteners for detachable attachment. The tool shaft 28 is eccentric with respect to a shaft of the drive motor 25 (not shown in detail in the drawing), on which the output 26 is arranged; that is, an axis of rotation E of the tool holder 29 is eccentric with respect to an axis of rotation M of the drive motor 25.Thus, a rotary, but eccentric, grinding or drive movement can be generated by the drive train of the grinding machine 25. Of course, this eccentricity is only one embodiment; that is, the grinding machine 25 could, in principle, also drive the grinding wheel 50 without such eccentricity, for example, if the tool holder 29 were arranged directly on the output 26 of the drive motor 25.

[0118] The grinding disc 40 is arranged within a protective body 23, which is designed, for example, in the form of a dust extraction hood or protective hood. The protective body 23 is held by a tool section 22 of the motor housing 20, which is arranged on the motor section 21, or is integral with it.

[0119] A working surface 45 of the grinding disc 40 is positioned in front of the protective body 23, i.e. in front of its edge 24 which is oriented towards the working surface 45 or projects forward.

[0120] A dust extraction device 30 is used to extract dust generated during the use of the grinding machine 15 or the grinding wheel 40, specifically when particles are removed from the workpiece W. The dust extraction device 30 is, for example, arranged on the tool section 22. The dust extraction device 30 has a dust extraction port 31 to which a hose 12 of a dust extraction unit 11, such as a vacuum cleaner, can be connected. The dust extraction unit 11 generates a suction flow so that dusty air S can be extracted from the area of ​​the machining surface 45. Of course, a dust extraction unit or a flow generator could also be provided directly on the grinding machine 15, in particular a fan or the like. This could, for example, be driven by the drive motor 25 or a separate drive motor.

[0121] The extraction port 31 is connected to an extraction chamber 32, which extends around the tool holder 29. If a machine side 41 of the grinding wheel 40 is subjected to negative pressure or extraction, the exhaust openings 43 for the dust air S located in the extraction chamber 32 are also subjected to negative pressure.

[0122] Furthermore, ambient air L from the outside space flows around the grinding disc 40, for example through a gap 34 between the protective body 23, the extraction hood, and the grinding disc 40 and / or through flow openings 33 of the protective body 23.

[0123] The flow openings 33 are provided at an edge area 47 of the grinding disc 40. An extraction zone 44 in the center of the grinding disc 40, i.e., an extraction zone that extends around the drive mount 49, is limited by a sealing arrangement 35, which also chambers or encloses the extraction chamber 32.

[0124] The sealing arrangement 35 comprises a counter-sealing element 36 of the grinding machine 15, which, when the grinding wheel 40 is mounted on the grinding machine 15, abuts a sealing element 80 of the grinding wheel 40. The counter-sealing element 36 comprises, for example, an elastic ring body 37, in particular a type of sealing sleeve. The ring body is made, for example, of elastic plastic, rubber, or the like. The counter-sealing element 36 may have displacement contours, ridges, or the like, so that it is deformable relative to the essentially rigid or inelastic sealing element 80.

[0125] To reduce wear on the counter-seal element 36, contact elements 38 are embedded in the ring body 37, which slide along the sealing element 80 of the grinding disc 40. The contact elements 38 are made of a harder material than the ring body 37 and include, for example, metal pins.

[0126] The working surface 45 of the grinding disc 40 is located on its working side 42. Inlet openings 48 for the inflow of dusty air S are also located there. The inlet openings 48 communicate with through channels 59 of the grinding disc 40, which are flow-connected to the outlet openings 43.

[0127] The sealing element 80 extends around the extraction zone 44 on the machine side 41. The outlet openings 43, which open into the extraction chamber 32, are located inside the extraction zone 44. Thus, the sealing element 80 surrounds the extraction zone 44 in a ring shape. Radially outward with respect to the drive mount 49, i.e., between the edge region 47 or the outer circumference of the grinding disc 40 and the sealing element 80, an outer zone 46 is provided, which is closed off towards the machine side 41 by a cover element 70. Only radially outward with respect to the drive mount 49, i.e., in the edge region 47, is a ribbed structure 45 of the grinding disc 40 open, but not towards side 41, rather also towards the outer edge of the grinding disc 40, so that no dust deposits or the like are to be expected there.

[0128] The grinding disc 40 derives its rigidity primarily from the plate body 50, which is essentially rigid in bending. For example, the plate body 50 is made of metal, a thermosetting plastic, or the like. Furthermore, the plate body 50 is stiffened by the rib structure 45.

[0129] The plate body 50 is provided on its machine side 51 with a plurality of cavities 57 located between ribs 56 of the rib structure 55. The cavities 57 essentially result from the demolding of the plate body 50 during a casting process, for example, when a casting core GK (in Figure 3 (schematically represented) is removed from a respective cavity 57. Thus, spaces between the ribs 56, i.e., cavities 57, are open, while sections of a load-bearing wall 54 extend between the ribs 56 on the machining side 52 of the plate body 50.

[0130] It should be mentioned at this point that the support wall 54 has a multitude of recesses 59A that communicate with or form the inlet openings of the grinding wheel 40. Sections of the recesses 59A can, for example, be represented by inlet openings 58. The through-channels 59 communicate with outlet openings 53 on the machine side of the plate body 50, so that dusty air flowing into the recesses 59A or the inlet openings 58 can flow through the through-channels 59 to the outlet openings 53.

[0131] Insofar as the plate body 50 is open on its processing side 52 due to the recesses 59A, it is in any case closed or covered by a cover body 560.

[0132] The cover body 560 is arranged with its machine side 61 on the machining side 52 of the plate body 50, for example bonded to the plate body 50, positively connected (not shown) or the like.

[0133] The cover body 560 has a plate-like shape. The cover body 560 has, for example, flow openings 63 that are connected to or communicate with the inlet openings 58 of the plate body 50. Furthermore, a through-opening 569 is provided on the cover body 560 in the area of ​​the drive bracket 49, so that, for example, a fastening screw or the like, with which the grinding disc 40 can be connected to the tool holder 29, can be actuated.

[0134] The cover body 560 preferably has an adhesive layer 66, for example a hook and loop layer, an adhesive layer or the like, on its processing side 62 for an abrasive 90, in particular an abrasive sheet 90A. Of course, instead of the adhesive layer 66, an abrasive, e.g. a grit, an abrasive fabric or the like, could be arranged directly.

[0135] On the machine side 51, the plate body 50 is essentially covered by a cover element 70.

[0136] The cover element 70 extends into the outer zone 46 and covers the rib structure 55 on the machine side. This prevents dust or other unwanted material from penetrating the cavities 57 of the outer zone 46. The cover element 70 also substantially covers the cavities 57 of the rib structure 55 radially inward with respect to the sealing element 80.

[0137] A machining side 72 of the cover element 70 rests on the ribs 56 and can be bonded and / or welded to them, for example by thermal welding.

[0138] In the exemplary embodiment, the cover element 70 is held positively to the plate body 50 by the sealing element 80. Thus, for example, the flow openings 73 of the cover element 70 are aligned with the outlet openings 53 of the plate body 50, so that they can represent the outlet openings 43 of the grinding disc 40. The cover element 70 is provided not only in the outer zone 46 to cover part of the cavities 57, but also in the extraction zone 44. There, the cover element 70 covers all cavities 57 of the rib structure 55, except for the outlet openings 53 and the drive mount 49, for which flow openings 73 and passage openings 79 are provided.

[0139] The cover element 70 has further openings 78, namely for retaining projections 89 and thus retaining contours 88, which engage positively in the retaining receptacles or openings 78. For example, the retaining projections 85 are polygonal or otherwise provided with an anti-rotation contour on their outer circumference, i.e. around their respective insertion axis, along which they can be inserted into the retaining receptacles 78.

[0140] The sealing element 80 has a sealing body 83A, which has a through-opening 83 and thus an annular shape. The inner circumferential contour of the sealing body 83A, which defines the through-opening 83, defines the extraction zone 44. A sealing surface 83B is provided on the sealing body 83A, which is, for example, wall-like or plate-like, facing the machine side 81 of the sealing element 80. The counter-sealing element 36 can abut against this surface, for example, by rubbing against it.

[0141] The retaining projections 89 penetrate the retaining receptacles 78 or the openings of the retaining element 70 and project freely into the cavities 57. Of course, plug-in receptacles or similar positive-locking contours for the retaining projections 89 could be provided there, so that the sealing element 80 can be positively attached directly to the plate body 50 by means of the retaining projections 89. Such positive-locking support enables, for example, support against a force direction. F, which extends parallel to the machining surface 45. Thus, for example, a torque generated by the sealing elements 36 and 80 rubbing against each other is supported on the plate body 50.

[0142] The sealing element 80 is directly connected to the plate body 50 by means of locking elements 84, i.e., it is snapped into place. The locking elements 84 comprise positive-locking projections 85 that project towards the machining side 82 of the sealing element 80 and engage positively in positive-locking recesses 95 of the plate body 50. The positive-locking projections 85 and the positive-locking recesses 95 are, for example, plug-in projections and plug-in recesses.

[0143] The positive-locking projections 85 could engage in the positive-locking receptacles 95, for example, in a clamping fit. This clamping fit is achieved, for instance, by the positive-locking projections 85 having slots 85C, 85D, so that plug-in segments 85A, 85B are formed that are movable relative to and away from each other transversely to a plug-in axis SA. In particular, such a clamping fit is provided on lateral support surfaces 98 of the positive-locking receptacle 95, with which the respective positive-locking projection 85 is supported to resist the force F on the positive-locking receptacle 95. The support surfaces 98, for example, support a base region of a respective positive-locking projection 85, with which it is connected to the sealing body 83A.

[0144] The positive locking projections 85 are designed, for example, in the form of retaining pins that engage in the retaining receptacles or positive locking receptacles 95.

[0145] Opposite the insertion axis, along which the positive-locking projections 85 are inserted into the positive-locking receptacles 95, interlocking surfaces 97 are provided. The interlocking surfaces 97 are located in an extended section 96 of a respective positive-locking receptacle 95, into which a head region 86 of a respective positive-locking projection 86 engages. The head region 86 also has interlocking surfaces 87 that project transversely to the insertion axis SA in front of the base region or base section of a respective positive-locking projection 85. Thus, the positive-locking projections 85 are positively supported in the positive-locking receptacles 95 in a manner that facilitates the removal of the sealing element 80 from the plate body 50.When the positive locking projection 85 is inserted into the positive locking receptacle 95, the insertion segments 85A, 85B are displaced towards the slots 85C, 85D or in the sense of a narrowing of the slots 85C, 85D towards each other, so that the head areas 86 can pass the support surfaces 98 into the extended section 96 of the positive locking receptacle 95 and lock into place there with the positive locking receptacle 95.

[0146] For example, slots 85C and 85D run in a cross shape and / or at an angle to each other.

[0147] In addition to or as an alternative to the locking means 84, the sealing element 80 can also be bonded to the plate body 50.

[0148] Alternatively, it is also possible that, for example, form-fitting projections protrude from the plate body and engage in form-fitting recesses of a sealing element. Thus, for example, projections could be provided on the plate body 50 that engage in form-fitting recesses of the sealing element 80, which are provided instead of the form-fitting projections 85.

[0149] The positive-locking projections 85 are arranged at angular intervals, preferably equal or equidistant angular intervals, on the sealing element 80 and project towards the machining side 82 thereof. The positive-locking projections 85 penetrate passage openings 75 of the cover element 70, so that the latter is held sandwich-like between the sealing element 80 and the plate body 50.

[0150] The retaining contours 88 or retaining projections 89 form additional retaining elements that fix the cover element 70 to the plate body 50. The retaining projections 89 are also arranged, for example, at angular intervals from one another, in particular at regular angular intervals. It can be provided that a retaining projection 89 is provided next to or on each, preferably only every second, positive-locking projection 85.

[0151] Instead of the cover body 560, on which an abrasive in the form of the grinding sheet 90A can be directly arranged, a cover body 60 can also be provided.

[0152] The cover body 60 is attached to the plate body 50 by a machine side 61, for example by gluing or detachably connecting it, as will become clearer below. For example, a support wall body 64 of the cover body 60 rests against the plate body 50.

[0153] On a machining side 62 opposite the machine side 61, the cover body 60 has a machining wall body 65, which serves to fasten and support the abrasive 90, in particular the abrasive 90A. An adhesive layer 66 is arranged on the machining wall body 65, for example, which can be connected to the adhesive layer 94 of the abrasive 90, for example in the manner of a hook and loop fastener.

[0154] A cushion body 67 made of a foam material or other elastic material is arranged between the support wall body 64 and the machining wall body 65, so that the machining side 62 or the machining wall body 65 can deform in the direction of the machining side 52 of the plate body 50 by deforming the cushion body 67 in order to adapt to contours of the workpiece W.

[0155] The support wall body 64 and the machining wall body 65 have flat sides 64F, 65F facing away from each other, of which the flat side 64F of the support wall body 64 is provided and designed for contact with the plate body 50 of the grinding disc 60, 160 and the flat side 65F of the machining wall body 65 has the adhesive layer 66.

[0156] The cover body 60 has flow openings 63 which, in the state of the cover body 60 being mounted on the plate body 50, are aligned with the inlet openings 58, so that dusty air S, which flows into the cover body 60 through the flow openings 93 of the abrasive 90, which flows into inlet openings 63E of the cover body 60 and flows through flow openings 63, can flow out of outlet openings 63A of the cover body 60 and continue to flow through the plate body 50.

[0157] Instead of the adhesive layer 66, an abrasive material, for example an abrasive fabric, a grain material or the like, could be arranged directly on the cover body 60 or 560.

[0158] The cover body 60 is, for example, glued to the plate body 50.

[0159] On the other hand, the cover body 60 can be advantageously detachably fastened to a plate body 150 of a grinding disc 140, for example by means of screws 68B, which are inserted through through-holes 68 of the cover body 160 and screwed into screw receptacles 68D of the plate body 150, which are arranged on its machining side 52. The screws 68B have screw heads 68C which bear against the machining side 62 of the cover body 60, which is designed as a flat side. Unlike what is shown in the drawing, in Figure 14However, as indicated by dashed lines, the screw heads 68C are recessed into the machining side 52 or the machining wall body 65 in such a way that recesses are formed there in which the screw heads 68C are received, resulting in a substantially flat surface 62B on the machining side 62. To form such recesses, slots 68A extend from the through-openings 68, for example in a star shape, which enable or facilitate deformation or recess formation of the cover body 60 in the area of ​​the screw heads 68C.

[0160] The grinding disc 160 has the aforementioned plate body 150, which has a machine side 51 on which a drive mount 149 is provided. The drive mount 149 serves to attach a tool holder 129, which differs in some respects from the tool holder 59, but also has an eccentric bearing device 27. Retaining projections 29A are provided on its outer circumference, on which screw receptacles 29B are arranged. The retaining projections 29A are preferably positively engaged in the drive mount 149, for example by means of suitable receiving contours. However, this is not absolutely necessary, because screws 29C are provided that penetrate through openings 29D in the plate body 150 and are screwed into the screw receptacles 29B.

[0161] The plate body 150 is constructed similarly to the plate body 50, thus featuring a support wall 54 and inlet openings 58 on its machining side, which are connected via through channels 59 to outlet openings 53 on a machine side 51 of the plate body 150. A rib structure 155 stiffens and supports the support wall 54 and is open towards the machine side 51, meaning that cavities 57 are present between the ribs 156 of the rib structure 155. These cavities 57 are covered on the machine side 51 of the plate body 150 and thus also of the grinding wheel 140, so that dust and other unwanted material cannot penetrate the cavities 57.

[0162] The grinding disc 160 has a sealing element 180, which is integrally encompassed by a cover element 170. A machine side 81 of the sealing element 80 serves to ensure that the elastic ring body 37 and / or the counter-sealing element 36 abut it in a sealing manner. For the sealing engagement of the counter-sealing element 36, an annular sealing surface 83B is provided on a sealing body 83A of the sealing element 180, which extends around a passage opening 83 of the sealing element 180. Radially on the outside, the cover element 170 is arranged on the sealing element 180, which surrounds the sealing element 180 with an annular body 174 that has an annular shape.

[0163] The sealing element 180 is connected to the plate body 150 by means of a weld and essentially covers its cavities 57, except for rib structures open radially outwards with respect to the grinding disc 140.

[0164] Both the sealing element 180 and the cover element 170 are plate-shaped. The sealing element 180 projects in front of the cover element 170 in a direction away from the plate body 150. Retaining contours 188 can be provided on the sealing element 180, for example retaining projections that engage in the plate body 150, for example, supported on the ribs 156 of its rib structure 155.

[0165] Furthermore, positive-locking contours are advantageously provided on the machine side 51 of the plate body 150 and the machining side 82 of the sealing element 180. These contours advantageously and / or at least during an assembly and / or welding operation of the two components, positively engaging with one another and holding the two components relative to each other, so that the welding described below is achieved with optimal accuracy. For example, positive-locking projections 158A are provided on the machine side 51 of the plate body 150, for example in the form of centering projections or centering pins, which engage in positive-locking receptacles 178 of the cover element 170. The pairings of positive-locking receptacles 170 and positive-locking projections 158A are provided at angular intervals with respect to the axis of rotation or central axis of the grinding wheel 140.

[0166] Weld protrusions 185 are provided on the machining side 82 of the sealing element 180 and on the machining side 72 of the cover element 170, i.e., on the same side of both components. These protrusions are supported by the ribs 156 and connected to them by ultrasonic welding. The weld protrusions 185 extend in a partially annular shape around the outlet openings 53 of the plate body 50 and thus close off passage channels 59 through which dusty air can flow via inlet openings 58 on the machining side 52 of the plate body 50. The course of the weld protrusions 185 is adapted to the course of the ribs 156 and, for example, has sections 185A running approximately parallel to the outer circumference of the drive bracket 149, from which sections 185B extend away towards and up to the drive bracket 149.

[0167] Thus, the sealing element 180 covers or seals the radially inner area of ​​the machine side 51 of the plate body 150 surrounding the drive mount 159 and is welded to this area. Radially on the outside, the cavities 57 are covered by the cover element 170, which rests tightly on the end faces of the ribs 156 but is not, or not completely, welded to them. However, weld protrusions 177, for example spot weld protrusions, are provided radially on the outside of the machining side 72 of the cover element 170 with respect to the axis of rotation of the grinding wheel 140. These protrusions are welded to the material of the plate body 150. For example, several weld protrusions 177 are provided next to each other at angular intervals in the circumferential direction with respect to the axis of rotation of the grinding wheel 140. The weld protrusions 177 are located on the radially outer edge of the cover element 170 with respect to the axis of rotation of the grinding wheel 140.

[0168] Several, for example four, weld protrusions 177 form a weld protrusion group. Preferably, angular gaps are provided between the weld protrusion groups of weld protrusions 177, in which no weld protrusions are provided. The weld protrusions 177 preferably form several rows.

[0169] Using the example of a sealing element 180A, which is essentially equivalent to the sealing element 180 including the cover element 170 attached to it, weld protrusions are present that have a linear shape and also enable optimal welding with the plate body 150 in the area of ​​the cover element 170. For example, circumferential weld protrusions 185D are present, extending around the outer circumference of the cover element 170. Ring-shaped weld protrusions 185E also extend, for example, around the screw receptacles 86D. Furthermore, additional weld protrusions 185C extend radially outwards in a star-shaped pattern in the area of ​​the cover element 170. Overall, the weld protrusions of the sealing element 180 form a rib-like shape, which is, so to speak, complementary to the rib structure 155 and thus lies on or next to the end faces of the ribs 156.With a sufficiently powerful welding system, for example with 20 kilowatts and more, even elongated weld protrusions and a large number of weld protrusions, such as those on the sealing element 180A, can be welded using ultrasound.

[0170] The cushion body 67 of the cover body 60 is exposed at the outer circumference 69 of the cover body 60. As a result, it is not protected against damage, for example, if the grinding disc 140 comes into contact with an obstacle.

[0171] To remedy this problem, alternative cover bodies 60A, 60B, 60C, 60D, 60E, 60F, 60G are provided for the cover body 60, on the outer circumference 69 of which a connecting device 100A, 100B, 100C, 100D, 100E, 100F, 100G is provided. The connecting device 100A-100G protects the respective outer circumference 69 against damage by protecting the cushion body 67 through the connecting device 100A-100G, hereinafter also referred to simply as connecting device 100. The basic structure of the cover bodies 60A, 60B, 60C, 60D, 60E, 60F, 60G corresponds to the cover body 60, i.e. they have support wall bodies 64 and processing wall bodies 65, between which a cushion body 67 is sandwiched.

[0172] For example, a seam 101 is provided on the cover body 60A, which directly connects the support wall body 64 and the machining wall body 65. The seam 101 is preferably designed as a zigzag seam. It is particularly advantageous if the seam 101 is designed as a type of hem.

[0173] The support wall body 64 and / or the processing wall body 65 consists, for example, of rubber, textile material, composite materials or the like.

[0174] The support wall body 64 and the machining wall body 65 are connected to each other at their edges by the connecting device 100A. An advantageous effect of this is that the connecting device 100A, in particular the seam 101, forms a circumferential section 69B on the outer circumference 69, where the wall bodies 64 and 65 are arranged directly adjacent to each other and are firmly connected. Extending from this, an inclined section 69A of the outer circumference 69 reaches to a flat or substantially flat mounting surface 69C, which is provided for attaching the abrasive 90. The inclined section 69A runs obliquely with respect to the mounting surface 69C.

[0175] The fastening plane 69C is preferably a flat plane beyond which the heads of the screws 68B do not protrude, namely by being inserted into the slots 68A or recesses of the cushion body 67.

[0176] Alternatively or additionally to the seam 101, a material-bonded connection 101A, for example a weld, bond, etc., is also possible. In all these cases, the wall bodies 64 and 65 are directly connected to each other, so that the cushion body 67 is enclosed at the outer circumference 69 and is not freestanding.

[0177] To better form the angled section 69A, a cavity 67A is provided, for example, between the cushion body 67 and the outer circumference 69. This is the case, for example, with a cover body 60A2.

[0178] Advantageously, the fastening level 69C and / or a central or middle area 69Z, or the largest surface area of ​​the machining side 62 of the cover body 60A, is designed such that no connection penetrating the cushion body 67 and the support wall body 64 and the machining wall body 65, e.g., no part of the connecting device 100, is provided there, i.e., no seam, no material-bonded connection, or the like. While this would be possible in principle, it could potentially result in the fastening level 69C having depressions or other recesses.

[0179] In a connecting device 100B, a ring body 102 is provided which, so to speak, clamps the support wall body 64, the machining wall body 65, and also the bearing wall 54. The ring body 102 has, for example, a circumferential wall section 102A, from which leg sections 102B, 102C project at an angle, for example, at right angles. This forms a U-shaped recess in which a circumferential portion 65A of the machining wall body 65 as well as a circumferential portion 64A of the support wall body 64 are received.

[0180] The ring body 102 preferably has a slot or a clamp opening 102D, so that it can be mounted around the outer circumference of the grinding disc 140, enclosing the plate body 150 and the cover body 60B in the manner of a clamp.

[0181] A connecting device 100C has a similar concept to the connecting device 100B, except that, unlike the ring body 102, a ring body 103 only clamps the support wall body 64 and the machining wall body 65 together. The ring body 103A has a circumferential wall section 103, from which leg sections 103B and 103C project at an angle, thus forming a recess in which the circumferential parts 65A of the support wall body 64 and the machining wall body 65 are received.

[0182] Like the ring body 102, the ring body 103 also has a slot or a clamp opening 103D, so that it can be arranged around the cover body 60C in the manner of a clamp. It engages, for example, in a recess or circumferential receptacle 54A of a plate body 150C, which is located on the outer circumference of its supporting wall 54 and / or is open radially outwards. Otherwise, the plate body 150C corresponds to the plate body 150.

[0183] The plate body 150C is also suitable for a connecting device 100D, which has a so-called two-part ring body 104. This is designed, for example, as a stamped and bent part. A ring element 104A and a ring element 104B are, for example, welded and / or bonded together, for example in the area of ​​a circumferential section 104E of the ring element 104A. From this circumferential section 104E, a circumferential wall section 104C extends away from the ring element 104B in one direction, while a leg 104B is opposite the ring element 104B, so that a receptacle is provided between these two latter components into which the circumferential wall sections 64A and 65A engage or in which they are received.

[0184] An alternative concept is implemented in a connecting device 100E, whose ring body 105 has ring elements 105B and 105C that sandwich together and connect the circumferential sections 64A and 65A. The ring elements 105B and 105C are, for example, ring-shaped, in particular circular, plate bodies or wall bodies that face each other with their end faces or flat sides, wherein the circumferential section 65A of the machining wall body 65 and one circumferential section 64A of the support wall body 64 are accommodated between the end faces or flat sides.

[0185] For example, the ring elements 105B and 105C are connected to each other by connecting elements 105A, e.g., rivets, screws, or the like, which penetrate both the ring elements 105B and 105C as well as the support wall body 64 and the machining wall body 65, thus firmly connecting all components. This results in the cover body 60E being compacted and hard at its outer circumference 69, and advantageously impact-resistant. However, it is also conceivable that the ring elements 105B and / or 105C are not provided, in which case the connecting elements 105A directly connect the circumferential sections 64A and 65A. It is also possible that only one of the ring elements 105B and / or 105C is present.

[0186] However, even a relatively soft outer circumference of the cover element 60F offers optimal protection for the cushion body 67. For example, a ring body 106 of the connecting device 105 is made of an elastic material, e.g., plastic, rubber, or the like. The ring body 106 has a circumferential wall 106A, which preferably has wall sections 106B that are movable relative to each other. For example, the wall sections 106B are oriented in a V-shape or are positioned relative to each other in a V-shape. Wall sections 106C and 106D extend from the circumferential wall 106A and are connected to the supporting wall body 64 and the circumferential wall body 65, for example, by a material bond, adhesive bond, or the like.

[0187] Furthermore, a section 106E of the ring body 106 engages in the previously described recess 64A of the plate body 150C. It is advantageous if the plate body 150C, with its supporting wall 64, projects approximately to the circumferential wall sections 106D and 106C, so that it can provide additional mechanical protection for the cushion body 67.

[0188] However, a material that is more wear-resistant than the cushion body 67, yet still flexible, and is accommodated between the wall bodies 64 and 65, can also constitute a connecting device, as is the case with connecting device 100G. There, for example, a ring body 107 is formed from a foam material that is more wear-resistant than the foam material of the cushion body 67, for example, harder, and / or more closed-cell, or the like. The ring body 107 extends to the outer circumference 69, where it is open at the end face, i.e., not covered by, for example, the support wall body 64 or the machining wall body 65. Since the ring body 107 is mechanically more resilient than the cushion body 67, it is less sensitive to impact loads than the cushion body 67.The thickness of the ring body 107 is advantageously selected to be smaller than the thickness of the cushion body 67, where the thickness represents the distance between the support wall body 64 and the machining wall body 65. Thus, an inclined section 69A extends from the central region or main surface area of ​​the cover body 60G to a circumferential section 69B, which is set back from the central region.

[0189] It can be seen that the support wall body 64 is not necessary in all cases. For example, in the embodiment of the cover body 60C, no support wall body 64 is present, in which case the ring body 103 connects the machining wall body 65 directly to the support wall 54, so that the cushion body 67 is enclosed between the support wall 54 and the machining wall body 65. In this case, the ring body 103 provides sufficient protection at the outer circumference 69.

[0190] In the other embodiments, a similar approach is possible, i.e., no supporting wall body is present. For example, in the embodiment of the cover body 60A, the processing wall body 65 can be directly connected to the plate body 50, i.e., the supporting wall 54, at its outer circumference 69, for example by a seam, a weld, or the like.

Claims

1. A cover body (60A-60G) for a sanding pad (40) or as part of a sanding pad (40), wherein the cover body (60A-60G) is configured as a cushion and has a supporting wall body (64) and a machining wall body (65), between which an elastic and / or resilient cushion body (67) is held in a sandwich-like manner, wherein the supporting wall body (64) and the machining wall body (65) have flat sides (64F, 65F) facing away from one another, of which the flat side (64F) of the supporting wall body (64) is provided and configured for contact on one or the planar body of the sanding pad and the flat side (65F) of the machining wall body (65) contains a sanding means (90) or an adhesive layer (66) for the detachable fastening of a sanding means (90), and wherein the machining wall body (65) and the supporting wall body (64) are connected to one another by a connecting device (100A-100G) on an outer circumference (69) of the cover body (60A-60G), so that the cushion body (67) is protected against mechanical damage by the supporting wall body (64), the machining wall body (65), and the connecting device (100A-100G) on the outer circumference (69) of the cover body (60A-60G), characterized in that the connecting device (100A-100G) comprises a seam (101) or connecting bodies spaced apart from one another or is formed by a seam (101) or connecting bodies spaced apart from one another, wherein the seam (101) or the connecting bodies connect the supporting wall body (64) and the machining wall body (65) to one another, in particular directly.

2. The cover body of claim 1, characterized in that the supporting wall body (64) and / or the machining wall body (65) consist of material which is different and / or has higher tensile strength and / or is more impact-resistant and / or denser and / or harder than the cushion body (67) and / or in that the supporting wall body (64) and / or the machining wall body (65) consist of a textile material and / or in that the connecting device (100A-100G) comprises a material bond, in particular a welded bond and / or an adhesive bond, wherein the material bond (101A) connects the supporting wall body (64) and the machining wall body (65) to one another, in particular directly.

3. The cover body of claim 1 or 2, characterized in that the connecting device (100A-100G) comprises at least one ring body (102-107) which at least partially encloses the outer circumference (69) of the cover body, in particular like a clasp.

4. The cover body of claim 3, characterized in that the at least one ring body (102-107) has at least one peripheral wall portion (102A) overlapping the cushion body (67) on the outer circumference (69) of the cover body (60A-60G) and / or has at least one leg portion (102B, 102C) on which a flat side (64F) of the supporting wall body (64) or a flat side (65F) of the machining wall body (65) or the planar body of the sanding pad is supported and / or in that the at least one ring body (102-107) clamps the machining wall body (65) to the supporting wall body (64) and / or the planar body and / or comprises ring bodies (102-107) that are opposite to one another and are connected to one another, in particular by connecting bodies and / or rivets and / or bolts, and between which the machining wall body (65) and the supporting wall body (64) are held in a sandwich-like manner and / or in that the at least one ring body (102-107) is arranged in a sandwich-like manner between the supporting wall body (64) and the machining wall body (65) or has a section arranged between the supporting wall body (64) and the machining wall body (65) and / or in that the ring body (102-107) is elastic or has an elastic part and is deformable by a force acting on the machining wall body (65) in the direction of the supporting wall body (64).

5. The cover body of any one of claims 1 to 4, characterized in that it has a large-region central region (69Z) in which the cushion body (67) is arranged and around which the connecting device (100A-100G) extends, and in that in the central region (69Z) there is no connection penetrating the cushion body (67) between the machining wall body (65) and the supporting wall body (64) and / or in that the machining wall body (65) has a large-region central region (69Z) in which the machining wall body (65) projects farther in front of the supporting wall body (64) than on the outer circumference (69) of the cover body (60A-60G) and / or in that inflow openings (63E) for dirty air are arranged on the flat side (65F) of the machining wall body (65) and are connected to outflow openings (63A) on the flat side (64F) of the supporting wall body (64) via through-channels (63) and / or in that a cavity (67A) enclosed by the supporting wall body (64) and the machining wall body (65) is provided between the cushion body (67) and the outer circumference (69) of the cover body (60A-60G).

6. A sanding pad for a sanding machine (15), comprising a drive holder (49), situated on the machine side (41) of the sanding pad, to be fastened in a non-rotatable manner to a drive (26) of the sanding machine (15), such that the sanding pad (40) can be driven by the sanding machine (15) in an in particular rotational and / or eccentric sanding motion that is suitable for sanding a workpiece (W); wherein the sanding pad (40) comprises a machining side (42), which is opposite the machine side (41) and has a machining face (45) on which a sanding means (90) for abrasive machining of a workpiece (W) can be arranged so as to be fixed or removable using an adhesive layer (66), wherein inflow openings (48) for dust-laden dirty air (S) to flow in are situated in the machining face (45), and outflow openings (43) fluidically connected to the inflow openings via through-channels (59) are situated on the machine side (41); wherein the outflow openings (43) are situated in a suction zone (44) within an annular sealing element (80) that is situated on the machine side (41) for sealingly contacting a counter-sealing element (36) of the sanding machine (15), wherein the sanding pad (40) comprises a planar body (50) which has a supporting wall (54) provided for supporting the sanding means (90), which supporting wall is reinforced by a rib structure (55), the ribs (56) of which project beyond the supporting wall (54) towards the machine side (41), wherein the ribs (56) delimit cavities (57) which are closed by the supporting wall (54) with respect to the machining side (42) and are open with respect to the machine side (41), wherein the sealing element (80) covers at least some of the cavities (57) towards the machine side (41). characterized in that a cover body (60, 60A-60G, 560) according to one of the preceding claims having a machining face (45) and, in particular, closing recesses (59A) on the planar body (50) is arranged on the supporting wall (54).

7. The sanding pad of claim 6, characterized in that the sealing element (80) and the planar body (50) are integral or the sealing element (80) and the planar body (50) are separate components which are fixedly connected to one another and / or in that at least one cavity (57) covered by the sealing element (80) on the machine side (41) is a demolding cavity formed by removing a casting core (GK) from the cavity (57) and / or in that the sealing element (80), except for the outflow openings (43), covers and / or tightly closes all cavities (57) of the planar body (50) within the suction zone (44) and / or on a flat side of the planar body (50) and / or between the drive holder (49) and an edge region (47) of the planar body (50).

8. The sanding pad according to claims 6 or 7, characterized in that the sealing element (80), except for the outflow openings (43), tightly closes at least a part of the cavities (57), preferably all cavities (57), so that a volume located in the respective cavity (57) is closed dust-tight, and / or in that the sealing element (80) covers and / or tightly closes at least one, multiple, or all of the cavities (57) provided and configured to form one or more through channels (59) and / or at least one or all through channels (59) and / or in that the sealing element (80) rests flatly on the end faces of the ribs (56) facing toward the sealing element (80) and / or in that the sealing element (80) is connected by means of welding, in particular ultrasonic welding, and / or adhesive bonding to the planar body (50), in particular to the ribs (56), and / or in that the sealing element (80) and / or the planar body (50) have at least one welding projection, in particular a welding tip, for welding to the respective other component of the sealing element (80) or planar body (50) or are welded by means of the at least one welding projection to the respective other component of sealing element (80) or planar body (50).

9. The sanding pad according to one of claims 6 to 8, characterized in that the planar body (50) and the sealing element (80) are supported on one another in a form-fitting manner in a force direction (F) parallel to the working surface (45) and / or in that the sealing element (80) is detachably arranged on the planar body (50), in particular by means of clamping means and / or latching means (84) and / or a detachable adhesive bond and / or in that the sealing element (80) and the planar body (50) are connected to one another in a form-fitting manner by at least one pairing of a form-fitting projection (85) and a form-fitting receptacle (95) which extend transversely, in particular perpendicularly, to of the machining surface (45) and interlock.

10. The sanding pad according to one of claims 6 to 9, characterized in that the sealing element (80) has at least one support contour, in particular a support receptacle and / or a support rib projecting in front of the sealing element (80) for lateral contact on a rib (56) delimiting a cavity (57), wherein it is advantageously provided that the sealing element (80) has two support contours and / or welding projections spaced apart from one another, in particular support ribs, which are provided for contact on opposite ribs (56) delimiting a cavity (57) or delimit a receptacle for engaging a rib (56) and / or that the at least one support contour or the at least one welding projection has at least two support contours or welding projections extending at an angle to one another, in particular support ribs, for support on ribs (56) angled in relation to one another and / or that the at least one support contour or the at least one welding projection comprises a support frame for lateral contact on an inner circumference of a cavity (57) delimited by ribs (56) of the rib structure (55) and / or that the at least one support contour forms or comprises a welding projection for thermal welding and / or ultrasonic welding of the sealing element (80) to the planar body (50).

11. The sanding pad according to one of claims 6 to 10, characterized in that it has a cover element (70) which covers at least part of the cavities (57) on the machine side (41), wherein it is advantageously provided that the cover element (70) is held on the planar body (50) in a form-fitting manner and / or by means of the sealing element (80) and / or by means of an adhesive bond and / or is integrally formed or fixedly connected with the sealing element (80) or is formed by the sealing element (80) and / or that the cover element (70) has openings, in particular passage openings (78) and / or through-flow openings (73), for form-fitting elements, using which the sealing element (80) and the planar body (50) are fixed on one another in a form-fitting manner, and / or for engaging holding contours (88) of the sealing element (80) and / or for through-flow of dirty air (S) and / or for the drive holder (49).

12. The sanding pad according to one of claims 6 to 11, characterized in that the sealing element (80) and / or the or a cover element (70) at least partially covering the cavities (57) of the planar body (50), except for the outflow openings (43) for the dirty air (S) outside and / or inside the suction zone (44) cover all cavities (57) of the planar body (50) on the machine side (41), which are closed between the machine side (41) and the machining side (42) or to an outer edge of the sanding pad (40) with respect to an outer circumference (69) of the planar body (50).

13. The sanding pad according to one of claims 6 to 12, characterized in that at least a part of the ribs (56) of the planar body (50) extend radially or radiating away from the drive holder (49) to an edge region (47) of the sanding pad (40) and / or in that at least a part of the ribs (56) of the planar body (50) extend to a common support plane (SE), in which the ribs (56) support the sealing element (80) and / or the cover element (70) and / or in that the supporting wall (54) of the planar body (50) has recesses (59A) on the machining side (42) to form the inflow openings (48) and / or to provide at least partial portions of the through-channels (59).

14. The sanding pad according to one of claims 6 to 13, characterized in that the cover body (60, 60A-60G, 560) has or is formed by an elastic and / or resilient cushion body (67) and / or the cover body (60, 60A-60G, 560) covers the planar body (50) on the machining side (42) completely or except for an edge region which is remote from the drive holder (49) and provided for reaching behind the sanding means (90) and / or through-flow openings (63) for dirty air (S) and / or that the cover body (60, 60A-60G, 560) has the sanding means (90) or the adhesive layer (66) for the detachable fastening of the sanding means (90) on the sanding pad (40) and / or in that the cover body (60, 60A-60G, 560) is detachably fastened on the planar body (50) by means of fastening bolts, in particular threaded bolts.

15. A sanding machine (15) having a drive motor (25) for driving an output (26) and having a sanding pad (40) for fastening on the output (26) according to any one of claims 6 to 14 and / or having a sanding pad (40) on which a cover body according to any one of claims 1 to 5 is arranged, wherein the sanding machine (15) has a counter-sealing element (36) for contact on the sanding pad (40) and / or the sealing element (80) of the sanding pad (40), wherein it is advantageously provided that the counter-sealing element (36) has an elastic ring body (37) made of an elastic material and / or that at least one contact body (38) provided for grinding contact on the sealing element (80) and made of a material that is harder than the elastic material, in particular made of metal, is embedded in the ring body (37) and / that it has an eccentric bearing device (27) for eccentrically driving the sanding pad (40).

Images