WO2021175687A1

WO2021175687A1 - Sanding pad having a sealing element and a rib structure, and sanding machine

Info

Publication number: WO2021175687A1
Application number: PCT/EP2021/054637
Authority: WO
Inventors: Stefan Tulodziecki; Mutasem RABAH; Frank SIEBERT
Original assignee: Festool Gmbh
Priority date: 2020-03-02
Filing date: 2021-02-25
Publication date: 2021-09-10
Also published as: CN115210041A; US20230339062A1; JP2023517191A; EP4114613A1; DE102020105572A1; CN117840882A

Abstract

The invention relates to a sanding pad (40) 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 in an in particular rotational and/or eccentric sanding motion that is suitable for sanding a workpiece (W); wherein the sanding pad 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; wherein the sanding pad 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). The invention also relates to a sanding machine which comprises a sanding pad of this type. According to the invention, the sealing element (80) covers at least some of the cavities (57) with respect to the machine side (41).

Description

Festool GmbH, Wertstrasse 20, 73240 Wendlingen

Sanding pad with a sealing element and a rib structure as well as a grinding machine

The invention relates to a grinding plate for a grinding machine, with a drive holder arranged on its machine side for rotationally fixed fastening to an output of the grinding machine, so that the grinding plate can be turned into a workpiece suitable for grinding, in particular rotary and / or eccentric, grinding movement can be driven, the grinding plate having a processing side opposite the machine side with a processing surface on which an abrasive for abrasive processing of a workpiece can be fixed or releasably arranged using an adhesive layer, with inflow openings on the processing surface for the inflow of dust laden dust air and on the machine side with these through channels flow-connected outflow openings are arranged, the outflow openings in a suction zone within a ring-shaped, on the machine side for a sealing system Sealing elements arranged against the sealing element of the grinding machine are arranged, the grinding plate having a plate body which has a supporting wall provided for supporting the abrasive, which is stiffened by a rib structure, the ribs of which protrude to the machine side in front of the supporting wall, the ribs to the machining side delimit cavities closed by the supporting wall and open to the machine side. The invention also relates to a grinding machine that has such a grinding plate.

Such a sanding plate is explained, for example, in DE 102016 100072 A1. In the known sanding plate, the plate body is designed as a support body. stalten, on the underside of which a soft pad is arranged, and thus towards the processing side. The plate body is stiffened by a rib structure that extends around the drive bracket. A sealing element in the form of a running surface extends annularly around this rib structure, on which a counter-sealing element, for example a sealing collar or the like of the grinding machine, can lie in a sealing manner. When the sanding pad rotates, the sleeve grinds along the sealing element of the sanding pad and thus houses a suction zone from which dust-laden air can be extracted.

The concept of the known grinding plate provides that the ribs can only be arranged radially on the inside, close to the drive holder, while the plate-shaped sealing element or the raceway is provided radially on the outside. The stiffening concept is therefore limited in the known sanding pad.

A sanding plate known from US Pat. No. 9,302,365 B2 has a plate body on which a sanding pad is arranged, a series of through-flow openings allowing the sanding plate to flow through from its processing side to its machine side. A cover ring suitable for guiding a flow flowing through the flow openings is arranged on the machine side.

From DE 202013010480 U1 a sanding plate is known which has a cushion with a chamber structure. A support plate that covers the chamber structure is arranged on the chamber structure.

DE 102010012007 A1 explains a grinding plate with a base plate which has a tool holder for driving a grinding machine, and with a cushion part with air ducts on the underside of the base plate. It is therefore the object of the present invention to provide an improved grinding plate and a grinding machine equipped therewith. To achieve the object, it is provided in the case of a grinding plate of the type mentioned at the outset that the sealing element covers at least part of the cavities on the machine side.

A basic idea of the sanding pad is that the rib structure is also present in the area of the sealing element, for example the track for the counter-sealing element of the grinding machine, with gaps between the ribs being covered by the sealing element. Thus, the plate body and ultimately also the sanding plate are reinforced by the rib structure in the area of the sealing element or in the radial distance between the sealing element and the drive holder. Nevertheless, the sealing element is located there.

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

The plate body preferably forms a hard component of the grinding plate that stiffens the grinding plate.

The plate body is preferably not made of a foamed material and / or of foam.

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

Advantageously, the plate body is harder and / or more rigid than a cover body arranged on the processing side, for example a grinding pad.

The rib structure is preferably integral with the support wall. It is also possible, however, for the rib structure to be glued, injection-molded or cast on, or the like, to the supporting wall. It is advantageous if the sanding pad 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 sanding pad, which are or will be connected to one another. Thus, the rib structure already present on the supporting wall is at least partially covered by the sealing element in the course of the manufacture of the grinding plate.

It is advantageous if the plate body has further ribs on a radially outer edge region with respect to the drive holder, in particular ribs of the kind which extend in a star-shaped or radial-shaped manner from a center of the Plattenkör pers or grinding plate. Such ribs can, for example, have a stiffening function. It is also possible for the ribs to form flow channels. There are recesses between these ribs, which are advantageously not covered by the sealing element. The radially outer edge area of the plate body is advantageously not covered by the sealing element.

The sealing element can, for example, be plate-like. However, it is also possible for the sealing element to contain a sealing collar or part of a sealing collar. Thus, the sealing element or the counter-sealing element or both can be designed as a sleeve or some other flexible sealing element.

During operation of the grinding machine, the sealing element and the counter-sealing element rest against one another in a sealing seat, so that the suction zone is encased or encased in the counter-sealing element by the sealing element.

The sealing element which covers the cavities on the machine side is preferably the only sealing element for the sealing contact of the or a counter-sealing element of the grinding machine. The plate body and / or the sealing element are preferably essentially rigid, in particular when they are arranged next to one another.

The sealing element preferably has a sealing surface for the abutment of the counter-sealing element, which is designed as a flat surface or flat surface. The sealing surface and the machining surface are preferably parallel to one another.

The sealing element preferably comprises an annular body and / or plate-shaped or wall-like body.

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 consist of a fiber-reinforced material, e.g. a plastic reinforced with glass fibers and / or carbon fibers.

The plate body is preferably designed on the machine side in such a way that, without the sealing element at least partially covering the cavities, it has no sealing surface, in particular no sealing surface extending annularly around the drive holder, for the sealing contact of the or a counter-sealing element of the grinding machine. In principle, however, it is possible for the plate body, in addition to the sealing element covering the cavities, to have at least one additional sealing surface or sealing contour, in particular extending in a ring around the drive holder, for sealing contact by a counter-sealing element of the grinding machine.

Both the sealing element and the counter-sealing element can be hard components or soft components or both. In particular, it is advantageous if the sealing element is plate-shaped or flat, ie the component located on the sanding plate has a plate-like or web-like shape. The counter-sealing element is preferably designed as a Dichtungsman cuff or sealing collar, for example on the tool holder of the grinding machine, which is in engagement with the drive holder of the Grinding plate can be brought, is arranged. 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 a ring. Of course, this configuration is also advantageous for the sanding pad, ie the drive bracket is located centrally in the area of the sealing element or in its center.

The sealing element and the plate body can be made in one 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.

A preferred concept provides that the plate body and the sealing element are separate, but firmly connected components. The fixed connection can be a permanent connection, for example a welded connection, adhesive connection or the like. The fixed connection can also be a releasable connection, for example a latching connection, clamping connection, form-fitting connection, adhesive connection with a releasable adhesive or the like. However, the sealing element is fixedly arranged on the plate body during operation of the sanding plate or for the operation of the sanding plate on the plate body.

At least one cavity of the plate body covered by the sealing element of the grinding plate on the machine side is advantageously a Entformungskavi ity that is formed by removing a cast core from the cavity. The plate body is made for example using a die and a core. The die ultimately defines the design of the supporting wall, while the core is required to form the rib structure. The casting cavity, in which the plate body is formed during casting or injection molding, is provided between the die and the core. If the core is removed from the die, i.e. the plate body is removed, so to speak, the cavities are created between the ribs of the rib structure. It is advantageously provided that the sealing element covers and / or tightly closes all cavities of the plate body within the suction zone and / or on a flat flat side of the plate body between the drive holder and an edge region of the plate body. For example, the plate has tenkkörper outside or radially outside with respect to the drive bracket or the sealing element further ribs, which are not covered or covered by the sealing element. The edge area preferably has a conical or inclined course. The edge area preferably rises from the outer edge of the plate body to its area on which the sealing element is arranged.

It is possible if the sealing element, apart from the outflow openings, covers all cavities or at least a large part of the cavities of the plate body, in particular closes it tightly. It is particularly advantageous if the sealing element, apart from the outflow openings, covers or tightly closes all cavities of the plate body which are not open radially outward with respect to the drive holder of the plate body or grinding plate.

It is particularly advantageous if the sealing element completely and / or tightly closes at least one, preferably several or all of the cavities.

A preferred concept provides that the sealing element, apart from the outflow openings, tightly closes at least part of the cavities, preferably all cavities or a large number of cavities, so that a volume located in the respective cavity is closed or enclosed in a dust-tight manner.

Preferably, those cavities of the plate body which are closed by the sealing element are completely closed by the sealing element. Such a closed cavity is, for example, by the rib structure, with ribs of the rib structure forming peripheral walls of the cavity, and on opposite sides by the supporting wall and the sealing processing element closed. The sealing element and the supporting wall are connected to the ribs forming the peripheral walls in such a way that the cavity is completely closed.

It is preferably provided that the sealing element covers and / or tightly closes at least one, several or all of the cavities provided and configured to form one or more passage passages and / or at least one or all passage passages. It is possible that cavities that are present apart from the through channels are covered by the sealing element, but are not completely tightly closed. A cavity covered by the sealing element that is not tightly closed, for example by welding or gluing, is also protected against the ingress of dust.

So there are initially cavities in the raw plate body, so to speak, but these cavities are covered or closed by the sealing element. For example, the ribs and the supporting wall delimit the cavity on first sides, for example two, three or four sides, and the sealing element closes the at least one second side, for example a fourth, fifth or sixth side. It is therefore advantageous if the sealing element, the supporting wall and the ribs completely enclose or chambers a volume in one or more cavities. This means that no dust can get into the respective cavity when the sanding pad is in operation. As a result, the mechanical properties, such as balancing or synchronization of the grinding plate, do not change or are in any case not changed by dust that could otherwise become lodged in the cavity.

It is preferred if 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 single-chamber volumes in a respective cavity. It is also advantageous if the sealing element is connected to the plate body, for example the ribs, in particular their end faces, by means of a weld, for example a thermal weld, an ultrasonic weld or the like. Instead of, or in addition to, welding, gluing can also be provided. Thus, a permanent connection of the sealing element and Plattenkör is advantageous.

To produce a weld, in particular a thermal weld, it is advantageous if so-called welding tips or welding projections are provided. It is advantageous, for example, if the sealing element and / or the plate body have at least one welding projection, for example a welding tip, welding rib or the like, for welding to the other component of the plate body and sealing element or are connected to one another by means of such a welding projection. The welding projection can be designed, for example, as a narrow ridge. The at least one welding projection can be a so-called energy director, for example. In the case of thermal welding, for example ultrasonic welding, the welding projection melts and thus ensures that the plate body and the sealing element are welded together.

It is possible for the at least one welding projection to have an elongated shape. The at least one welding projection can, however, also include, for example, an arrangement of several welding points or point-like welding projections or be formed thereby.

The at least one welding projection or a welded connection formed on the basis of the welding projection is designed, for example, like a frame or forms a frame. The at least one welding projection or a welded connection formed on the basis of the welding projection extends, for example, around an outflow opening of the plate body in such a way that the outflow opening is sealed off from the environment when the at least one welding projection or one formed using the welding projection Welded connection tightly connects the sealing element with the plate body in the vicinity of the outflow opening. As a result, for example, no dust-laden air can get from the area of the outflow opening between the sealing element and the plate body.

The plate body and the sealing element are advantageously supported on one another in a form-fitting manner in a force direction parallel to the machining surface or the geometric plane of the machining surface. For example, interlocking contours of the plate body and sealing element are in contact with one another. The interlocking contours or interlocking surfaces can include, for example, interlocking projections and interlocking receptacles on each part of the plate body and sealing element. The form-fitting support can, for example, support a torque that occurs between the plate body and the sealing element during operation with the grinding machine. Such a torque results, for example, from the friction of the counter-sealing element on the sealing element and / or when the machining surface rubbing against a workpiece, in each case when the grinding plate is driven by the grinding machine.

At this point it should be mentioned that the grinding machine can easily be a rotary grinding machine, i.e. the grinding plate is designed and provided for rotary, abrasive or grinding processing of a workpiece. However, it is also possible for the sanding plate to be designed as an eccentric sanding plate and the grinding machine as an eccentric sanding machine. It is easily possible that different operating modes can be set, for example by setting the grinding machine between a rotation principle, an eccentric drive principle or a hypercycloid rotation drive principle, i.e. to an eccentric rotation operation.

It is preferred if the sealing element is detachably arranged on the plate body, for example by means of clamping means and / or latching means and / or a releasable adhesive bond. Although the sealing element is one of that Plate body per se separate component, but detachably connected to the plate body. Thus, for example, when the sealing element or the plate body is worn, the respective worn component can easily be replaced. The sealing element and the plate body are expediently connected to one another in a form-fitting manner by at least one pairing of a form-fit projection and a form-fit receptacle, the form-fit projection and the form-fit receptacle extending transversely, for example perpendicular, to the processing surface and interlocking. The at least one form-fit projection is, for example, a form-fit pin and the at least one form-fit receptacle is a form-fit pin receptacle. Of course, the interlocking projection can also have a wall-like shape. The interlocking projection can, for example, be supported on a rib of the rib structure. A form-fit receptacle is then formed between the ribs. It is possible that a respective form-fit projection is supported only in one force direction on a wall of a form-fit receptacle, for example on a rib of the rib structure. At least one pairing or an arrangement of several pairings of form-fit projections and form-fit receptacles can also serve as an assembly aid or temporary flolding, for example until a weld or bond between the sealing element and the panel body is established.

A latching pin or latching projection is expediently provided as at least one form-locking projection. The at least one form-fit receptacle expediently comprises a latching receptacle. The at least one form-fit projection can also be a plug-in projection and the at least one form-fit receptacle can be a plug-in receptacle. The plug-in projection can be inserted into the plug-in receptacle along a plug-in axis. Of course, a plug-in receptacle can be designed as a snap-in plug-in receptacle and a plug-in projection as a snap-in plug-in projection. The plug-in receptacle and the plug-in projection expediently have rear gripping surfaces which extend transversely to the plug-in axis and which hinder or prevent removal of the plug-in projection from the plug-in receptacle. The rear gripping surfaces can, for example, be aligned obliquely to the plug-in axle or at right angles to the plug-in axle. It is possible that the rear gripping surfaces are normally at a distance from one another, in particular when the sealing element is already force-loaded in the direction of the plate body, in particular by the counter-sealing element. However, it is preferred if the rear gripping surfaces rest against one another, so that the sealing element is held firmly on the plate body also in the direction of the plug-in axis.

The plug-in projection expediently has at least two plug-in segments, preferably three or four plug-in segments, which are movable relative to one another 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 one another and / or can be moved away from one another. For example, the plug-in segments can initially be displaced towards one another in the plug-in axis direction when they are inserted until there is a free space that allows the plug-in segments to move away from one another again. At the free space, for example, the aforementioned rear gripping surfaces are provided. The plug-in segments are, for example, gebil det that the plug-in projection has a slot extending in the direction of the plug-in axis and penetrating in a plane in which the plug-in axis is located.

It is preferred if the sealing element has at least one support contour, for example a support receptacle and / or a support rib protruding in front of the sealing element, which is provided and designed for lateral contact with a rib limiting a cavity. The support contour can also be, for example, a welding projection or be formed by it. As a result, the sealing element and the plate body are supported on one another in a direction of force parallel to the machining surface. In principle, however, it is also possible for the plate body to have a support contour, in particular a support rib, provided for engagement with a counter-support contour of the sealing element and is designed, for example, to engage in a support receptacle, groove or the like, on the sealing element.

It is preferred if the sealing element has two mutually spaced support contours, for example two mutually spaced support ribs or inner sides of a form-fit receptacle, in particular a receiving groove, which are intended to rest on opposing ribs delimiting a cavity or, for example, in the manner of a Locating groove, limiting a receptacle for engaging a rib. Thus, the sealing element and the plate body are supported on one another in opposite directions of force parallel to the machining surface.

It is also preferred if the at least one support contour has at least two support contours that run at an angle to one another, for example support ribs, for support on ribs that are angled to one another. Thus, the sealing element and the plate body are supported on one another in directions of force at an angle to one another, parallel to the machining surface.

An advantageous embodiment can provide that the at least one support contour comprises a support frame for laterally bearing against an inner circumference of a cavity that is delimited by ribs, for example three or four or five ribs. The ribs and legs of the support frame run at an angle to one another, for example triangular, square, trapezoidal or the like.

The at least one support contour can preferably form or include 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 only ensures, for example, a form-fitting hold of the sealing element on the plate body and / or represents a support contour which is provided and designed for bonding the sealing element and the plate body.

In principle, it is possible for the sealing element to cover all or all cavities on the machine side that are located within the suction chamber. Find. Cavities located outside the suction space can also be covered by the sealing element. It is possible that all cavities located outside the suction space are covered by the sealing element. However, a construction is preferred, that is to say that the sanding plate has a cover element which covers at least part of the cavities towards 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, ie both the cover element and the sealing element are arranged above a respective cavity. It is also possible, please include that the sealing element covers at least part of the cavities with the interposition of the cover element, which it would also cover without a cover element.

The cover element is preferably plate-shaped. The cover element is preferably designed as an annular body

It is also possible that the sealing element and the cover element are integrally or firmly connected to one another. Furthermore, it is possible that the sealing element comprises or forms the cover element.

The cover element is preferably held firmly on the plate body. For example, the cover element is held on the plate body in a form-fitting manner and / or by means of the sealing element and / or by means of an adhesive bond, in particular a detachable adhesive bond, and / or a weld. Thus, the sealing element can, so to speak, form a holding element for the cover element. It is also easily possible for the sealing element to be held on the plate body by means of the cover element, for example in a form-fitting manner. For example, a portion of the sealing element can engage in an intermediate space between the cover element and the plate body and thus be held by the cover element on the plate body. The cover element advantageously has openings that can be seen for several purposes, for example for form-fit elements with which the sealing element and the plate body are positively fixed to one another, for engaging holding contours of the sealing element, ie for example Hal tevorsprüngen, which are arranged on the sealing element and engage in the openings. But the openings can also be provided for dust air to flow through or for drive support. The openings can preferably be through openings. However, it is also possible that the openings are only recesses or depressions, for example for engaging holding contours of the sealing element. Passage openings are not absolutely necessary at these points.

The sealing element preferably has holding projections for holding the cover element from on the plate body. The holding projections preferably extend in a plane parallel to the machining surface. The Haltevor jumps can comprise hook projections, the hook portions of which engages in the cover element from, for example in one of the aforementioned openings, which are designed as passage openings or recesses. The holding projections can be or comprise holding projections projecting radially outward, i.e. away from the drive holder, but preferably in the direction of the drive holder. In particular in the direction of the drive bracket, namely in the suction zone from, it is advantageous if additional retaining projections hold the cover element on the plate body. The retaining projections can extend up to the drive bracket to.

The sealing element and / or the cover element cover cavities of the plat tenkörpers in the area of the suction zone preferably completely or substantially union. It is advantageously provided that in the suction zone only outflow openings for the dust air and / or the drive holder are not covered by the sealing element and / or the cover element.

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 annularly around the drive bracket. Circular rings are easily possible.

If the sanding pad 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 the same basic geometric contour as the panel body or the sanding pad. The aforementioned ringför shaped shape of the sealing element and cover element can indeed be a circular ring-shaped shape, but can also be, for example, a triangular-ring-shaped or rectangular-ring-shaped shape.

The sealing element and / or the cover element expediently have an outer circumferential contour that correlates with the outer circumferential contour of the Plattenkör pers or grinding plate, for example a round or circular outer circumferential contour, a triangular outer circumferential contour or a rectangular outer circumferential contour.

The cover element is preferably fixed to the plate body in a rotationally fixed manner by the sealing element with respect to an axis of rotation about which the plate body rotates when the grinding machine is in operation. Form-fit contours, with which the sealing element and the plate body are in engagement with one another, preferably engage positively in the form-fit receptacles or form-fit contours of the cover element.

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.

It is possible that the sealing element has a higher mechanical loading capacity and / or wall thickness than the cover element. For example, the cover element can consist of a film-like material or a material with a thin wall thickness, while the sealing element, which is at least frictionally loaded by the counter-sealing element of the grinding machine during operation, has a higher flexural rigidity or strength than the cover. having ckelement. For example, there is a step between the sealing element and the cover element. The step is formed, for example, in that the sealing element has a greater material thickness than the cover element.

The sealing element and / or the cover element at least partially covering the cavities of the plate body, for example both jointly, cover, apart from the outflow openings for the dust outside and / or within the suction zone, all of the cavities of the plate body on the machine side which are related to of an outer periphery of the plate body are closed between the machine side and the machining side. For example, further cavities can be provided on the plate body radially on the outside or at the edge, which 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 sanding plate and are not covered there by the device element or cover element.

At least some of the ribs of the plate body extend radially or radially away from the drive holder to an edge region of the grinding plate. Of course, transverse ribs or transverse reinforcements can be provided between these ribs.

Some of the ribs of the plate body preferably define a common support plane or support surface in which the ribs support the sealing element and / or the cover element. The support plane is, so to speak, an enveloping or common plane in which the ribs of the plate body form a support plane, so to speak. The support plane can be a plane surface or a plane plane. It is advantageous if all of the 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.

The supporting wall can be an essentially closed supporting wall, on which, however, the inflow openings are provided. But it is also possible that the Support wall has recesses and depressions on the processing side, so that, for example, a type of rib structure is formed. The supporting wall of the plate body has on the processing side, for example, recesses for forming the inflow opening and / or for providing at least partial sections of the through channels. For example, the recesses extend radially from an outer circumference of the sanding plate to the drive bracket and / or to the outflow openings located next to the drive bracket.

The working surface of the grinding plate can be provided directly by the supporting wall. For example, an adhesive layer for the abrasive or the abrasive itself can be arranged there. The abrasive comprises, for example, a knitted abrasive fabric and / or an abrasive grain material, for example corundum. The abrasive is preferably an abrasive sheet. The sanding pad is advantageously suitable for fastening a sanding sheet to the working surface. Furthermore, it is possible that a cover body is arranged on the supporting wall, which covers the supporting wall, in particular also closes recesses on the plate body. The cover body can have through-flow openings or passage channels and also have the inflow openings of the grinding plate.

The cover body comprises, for example, an elastic and / or resilient cushion body, for example a type of pad, or is formed by it.

It is preferred if the cushion body is elastic and / or consists of a plastic that is impermeable to air and / or impermeable to dust particles. For example, the cushion body is made of foam. In a preferred embodiment, the cushion body comprises or consists of polyurethane foam, in particular an elastomer foam based on polyester and / or an aromatic PUR elastomer foam. The pillow body is designed, for example, as a pad or pillow.

The cover body can completely or essentially completely cover the plate body on the processing side. It is preferred if the cover body covers the plate body on the processing side apart from an edge area that is removed from the drive holder and provided for engaging behind the abrasive and / or apart from inflow openings or throughflow openings for dusty air. For example, there is no adhesive layer on the edge area, so that the abrasive, for example a sanding sheet, can be removed from the sanding pad. It is of course advantageous if the inflow openings on the processing surface are in flow connection with and / or communicate with inflow openings or throughflow openings of the cover body.

The following embodiment of the cover body forms an advantageous embodiment of the invention, i.e. it is suitable for an advantageous arrangement on the plate body. However, it is also possible that the cover body is used on another sanding plate, for example on a sanding plate that has no cavities and / or is not covered by a sealing element or a cover element or both. In particular, it is possible for such a sanding plate to have a plate body on which the cover body is arranged in accordance with the following configuration, but on which no special measures are taken. However, it is advantageous if such a plate body has inflow openings and outflow openings which are flow-connected to one another by means of through-channels, so that dust air flowing in on the processing side of the plate body can pass through the through-channels to the outflow openings, where it can be suctioned through, for example the suction device, the grinding machine or the like can ge long.

Advantageously or as an independent invention, a cover body for a sanding plate or as part of a sanding plate is provided, the sanding plate being designed in particular according to one of the preceding claims, the cover body being designed as a cushion and having a support wall body and a processing wall body , between which an elastic and / or resilient cushion body is sandwiched, the support wall body and the machining wall body separated from one another. have turned flat sides, of which the flat side of the support wall body is intended and designed to rest on one or the plate body of the grinding plate and the flat side of the processing wall body has an abrasive or a flake layer for the detachable attachment of an abrasive, in which it is provided that the processing wall body and the Support wall body are connected to one another on 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. A basic idea here is that the cover body is reinforced, so to speak, on the edge side, that is to say on its circumference, by the connecting device, and in any case covers the cushion body. Thus, the cushion body is chambered in a chamber, which is provided on the one hand by the support wall body and the processing wall body on opposite sides of the cushion body, on the circumferential side by the connecting device. The connecting device thus preferably forms a reinforcement of the cover body on its outer circumference.

At this point it should be mentioned that an outer circumference of the cover body is preferably essentially of the same shape as an outer circumference of the plate body or plate body of the grinding plate.

It is preferred if the supporting wall body and / or the machining wall body consist of a different and / or more tensile material than the cushion body. The cover body and the processing wall body therefore ensure a tensile, protective cover for the cushion body. The cushion body is preferably a foam body, for example made of a polyurethane foam or the like. The cushion body is therefore elastically resilient.

An embodiment would also be conceivable in which the support wall body is not present, that is to say that the cushion body is directly on the plate body, both for example a supporting wall of the plate body, and the plate body is connected to the processing wall body by the connecting device.

The cushion body consists for example of a single foam material or foam material or of a combination of at least two foam materials or foam materials.

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 closely meshed or less porous than the cushion body. Compared to the cushion body, the support wall body and the processing wall body are thin, i.e., 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.

The textile material of the supporting wall body and / or the processing wall body is preferably reinforced, for example by polyamide fibers.

The connecting device comprises, for example, a seam or connecting bodies spaced apart from one another, for example rivets or the like, or is formed by a seam or rivets. The seam or the connecting bodies are, for example, angularly spaced from one another. The seam or the connection body connect the support wall body and the processing wall body, for example directly with one another. However, it is also possible that at least a section of the cushion body is penetrated, so to speak, between the support wall body and the processing wall body by the connecting device, for example the seam, the connecting bodies and the like. It is preferred if the outer circumference of the cover body is hemmed with the seam.

However, it is also possible for the seam to be sewn through the respective front sides or flat sides of the supporting wall body and the processing wall body. A material connection is also possible. In this case, the connecting device comprises a materially bonded connection or is formed by a materially bonded connection, for example a welded connection and / or an adhesive connection. The material connection connects the support wall body and the processing wall body with one another, for example directly with one another. However, it is also possible in this case that, for example, an intermediate layer or a section of the cushion body is glued or welded between the support wall body and the processing wall body, the weld making the material of the cushion body so to speak stiffer and more resilient on its outer circumference. As an alternative or in addition to adhesive bonding, an ultrasonic welded connection can also be used, for example. Furthermore, the connecting device can be formed by a material vulcanized onto the processing wall body and the support wall body, which at the same time establishes a material connection between the two wall bodies.

An annular body is also advantageous as a connecting device which at least partially surrounds the outer circumference of the cover body. For example, the ring body grasps the cover body like a clasp.

The ring body comprises, for example, at least one peripheral wall covering the cushion body on the outer periphery of the cover body or a peripheral wall section. It is also advantageous in the ring body if it has one or more, for example two, leg sections on which a respective flat side of the support wall body, a flat side of the processing wall body or the plate body of the grinding plate is supported. For example, the support wall body, the processing wall body and the plate body can be supported by between opposing legs or between legs of the annular body. Thus, the ring body can also hold the plat tenkkörpers.

The ring body has, for example, a clamp opening or a slot which enables the ring body to be attached to the cover body. Longitudinal ends of the ring body, between which the clamp opening or the slot is vorgese hen, can be movable towards one another in the sense of enclosing the cover body. However, several ring segments can also be joined together to form the ring body, or the ring body can comprise several ring segments. It is preferred if the ring body completely or essentially surrounds the outer circumference of the cover body, so that it is protected as completely as possible on the circumference by the ring body.

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.

It is also possible that the annular body comprises opposing and in particular special by rivets, bolts or the like other connecting bodies connected annular bodies, between which the processing wall body and the supporting wall body is held in a sandwich-like manner. Furthermore, it is possible that a section of the plate body, for example an outer edge section of the plate body, also engages between these ring bodies.

The at least one ring body can, however, also comprise or be formed by an ring body which is arranged between the support wall body and the processing wall body or has a section arranged between the support wall body and the processing 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.

Upwards: The support wall body and / or the processing wall body advantageously consist of a material that is more impact-resistant and / or dense and / or harder than the cushion body.

The ring body, which is sandwiched between the support wall body and the processing wall body, preferably consists of a material that is more tensile and / or more shock-resistant and / or denser than the cushion body. Furthermore, this ring body can also, for example, from a Foam material or porous or resilient material. However, this material is preferably less porous or stronger or harder or all together than the pillow body.

The ring body can also be elastic and can be deformed by a force acting on the processing wall body in the direction of the support wall body. For example, the ring body is at least partially made of rubber or elastic Shem plastic. The ring body can be produced, for example, by vulcanization or connected to the cover body, for example the support wall body and / or the processing wall body, by means of vulcanization. The ring body therefore preferably forms a wall body which covers the cushion body radially on the outside or on the outer circumference of the cover body.

The cover body expediently has a large central area in which the cushion body is arranged and around which the connecting device extends. In the central area, there is preferably no connection between the processing wall body and the support wall body which penetrates the cushion body. The advantage here is that the cushion body has its full elasticity in the central area, i.e. that it, for example, brings the abrasive arranged on it flat to the workpiece to be machined. Furthermore, it is advantageous if the processing wall body has a large central area in which the processing wall body protrudes further in front of the support wall body and / or further in front of the plate body than on the outer circumference of the cover body. There, a return is implemented, for example, by the connection device. However, this return is advantageously not stepped, but continuous. The cover body therefore preferably has a convex or pillow-like shape in the area of the processing wall body.

On the flat side of the processing body, a flow openings for dust air are expediently arranged, which are connected to outflow openings on the flat side of the support wall body via passage channels. By Dust air can flow through the passage channels through the cover body. When mounted on the plate body of the sanding plate, the outflow openings of the cover body communicate with inflow openings of the plate body, which in turn are flow-connected to outflow openings on the machine side of the sanding plate via through channels.

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 device. However, it is also possible that, for example, a cavity enclosed by the support wall body and the processing wall body, so to speak air, is arranged between the cushion body and the outer circumference of the cover body. This cavity is preferably designed as an annular space.

The cover body with the connecting device on the edge offers a particular advantage, especially in connection with eccentric grinding machines, i.e. in which the grinding plate undergoes an eccentric or at least non-rotational movement. If the edge area of the sanding plate thus abuts a workpiece or a resistor, the connecting device protects the cushion body from damage.

At this point it should also be mentioned that the abrasive is preferably a sanding sheet that can be removed from the sanding pad and detachably held on it.

The adhesive layer comprises, for example, a component of a Velcro connection, for example a Velcro layer or Velcro hook, for the detachable attachment of the abrasive.

The abrasive can be arranged directly on the cover body, for example the abrasive pad. However, it is also possible that the cover body has or carries the adhesive layer, for example a Velcro layer, for the detachable attachment of the abrasive to the sanding plate. The invention further relates to a grinding machine with a sanding plate according to the invention and a counter-sealing element for contact with the up device element of the sanding plate. The counter-sealing element has, for example, an elastic ring body made of an elastic material. However, the counter-sealing element can also readily be a plate-shaped body which slides along the sealing element. In particular, it is advantageous if the counter-sealing element is held resiliently resiliently with respect to the sealing element on a housing of the grinding machine.

The grinding machine has, for example, a drive motor for driving a tool holder to which the drive holder of the grinding plate can be releasably attached. The drive motor can be an electric motor, for example an electronically commutated or brushless motor, a universal motor or the like. The drive motor can also be a compressed air motor. Between tween the tool holder and the drive motor, a gear and / or an eccentric mounting for eccentric mounting of the tool holder can be arranged with respect to an axis of rotation of the drive motor.

In the elastic ring body of the counter-sealing element, one or more contact bodies for grinding contact with the sealing element of the sanding plate are expediently embedded, the at least one contact body made of a material that is harder than the elastic material, for example metal. Thus, the counter-sealing element is wear-resistant ver.

From the sealing element holding pins are expediently, in particular several holding pins at an angular distance, which engage in pin receptacles of the plate body.

With a corresponding geometric configuration of the cover element and / or the sealing element, it is easily possible to individually set a suction concept for the grinding plate. The cavities of the sanding pad are not filled with dust or other similar material over time, which is Can negatively influence the running behavior or the smoothness of the sanding pad or its balancing.

The suction behavior or suction behavior of the dusty air can be adjusted by different configurations of sealing elements, for example geometrical configurations and / or different materials.

Existing panel bodies or sanding pads can be retrofitted with the sealing element. Variants of sanding discs can easily be produced by using different sealing elements. The sealing element can easily be replaced when worn.

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

An exemplary embodiment of the invention is explained below with reference to the drawing. Show it:

Figure 1 is a perspective oblique view of a partially cut grinding machine with a grinding plate, which in Figure 2 in an exploded view obliquely from above and in detail enlargements D2, D3 and D4 and in

Figure 3 is shown in the assembly obliquely from above,

FIG. 4 shows an exploded view of the sanding plate according to the preceding figures, roughly corresponding to FIG. 2, but from below at an angle and with enlarged details D5 and D6, FIG. 5 shows the sanding pad according to the preceding figures at an angle from below,

FIG. 6 is a top view of the sanding disc of the preceding figures from the top,

FIG. 7 shows a partial section corresponding to a detail D1, FIG. 8 shows the partial section according to detail D1, but along a section B-B in FIG. 6 of detail D1,

FIG. 9 shows an exploded view of the partially cut grinding machine according to FIG. 1 with a sanding pad in a further embodiment, FIG. 10 shows the sanding pad according to FIG. 9 at an angle from above, FIG.

FIG. 12 shows an exploded view of the sanding plate according to FIGS. 10, 11 obliquely from below, FIG. 13 shows an alternative sealing element for the sanding plate according to FIGS. 9-12,

FIG. 14 shows a section along a section line C-C through the sanding plate according to FIG. 10,

FIG. 15 shows a section along a section line D-D through the sanding plate according to FIG. 10,

FIG. 16 shows a variant of the sanding plate according to the preceding figures, but with a cover element which is reinforced on the edge side by a reinforcement device in a first embodiment, FIG. 17 shows the sanding plate and in particular the cover body according to FIG. 16 at an angle from below,

18 shows a detail D7 from FIG. 17, FIG. 19 shows a variant of the sanding plate according to FIG. 16 with a smaller cushion body, roughly corresponding to a detail D8 in FIG. 16,

FIG. 20 shows a further cover body, a variant of a sanding plate and a cover body with an annular body as a connecting device,

FIG. 21 shows a section through the sanding plate according to FIG. 20, roughly corresponding to section D8 in FIG. 16,

FIG. 22 shows the sanding plate according to FIG. 20 obliquely from above, but with an alternative ring body,

FIG. 23 shows a partial section through an edge region of the sanding plate according to FIG. 22, roughly in accordance with detail D8, FIG.

FIG. 25 shows a detail of the sanding plate and cover body according to FIG. 24, roughly corresponding to detail D8, FIG

FIG. 27 shows a detail section roughly corresponding to detail D8, FIG. 28 shows a further sanding pad and cover body from obliquely below, from which in

FIG. 29 shows a detail section, for example the detail D8 is shown,

FIG. 30 shows a further sanding plate and cover body from obliquely below with an elastic edge protection, which is shown in detail in

Figure 31 is shown as a sectional view (approximately corresponding to the detail D8).

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

A drive motor 25, for example an electronically commutated motor, a universal motor or the like, is accommodated in a motor section 21 of the machine housing 20. An output 26 of the drive motor 25 drives an eccentric bearing device 27 which rotatably supports a tool shaft 28, namely by means of one or more rotary bearings. The bearing device 27 has a work tool receptacle 29 to which a sanding plate 40 with its drive holder 49 can be releasably attached. The drive holder 49 and the tool holder 29 have, for example, corresponding screw contours, bayonet contours or similar other fastening means for detachable fastening. The tool shaft 28 has an eccentricity to a shaft of the drive motor 25 (not shown in more detail in the drawing) on which the output 26 is arranged, ie an axis of rotation E of the tool holder 29 is eccentric to a rotary Axis M of the drive motor 25. Thus, a rotary, but eccentric grinding movement or drive movement can be generated by the drive train of the grinding machine 25. Of course, this eccentricity is only one embodiment, ie the grinding machine 25 could in principle also drive the grinding plate 50 without such an eccentricity, for example if the tool holder 29 would be arranged directly on the drive 26 of the drive motor 25.

The sanding plate 40 is arranged within a protective body 23, which is configured in the manner of a suction hood or protective hood, for example. The protective body 23 is held by an arranged on the motor section 21 work tool section 22 of the motor housing 20 or is in one piece with the same ben.

A processing surface 45 of the grinding plate 40 projects in front of the protective body 23, i.e. in front of its edge 24 oriented or protruding towards the processing surface 45.

A suction device 30 is used to suction off dust that arises when the grinding machine 15 or the grinding plate 40 is used, namely by removing particles from the workpiece W. The suction device 30 is arranged on the tool section 22, for example. The suction device 30 has a suction connection 31 to which a hose 12 of a suction device 11, for example a vacuum cleaner, can be connected. The suction device 11 generates a suction flow so that dusty air S can be sucked off from the area of the machining surface 45. Of course, a suction device or a flow generator could also be provided directly on the grinding machine 15, in particular a fan wheel or the like. This can be driven, for example, by the drive motor 25 or a separate drive motor.

The suction connection 31 is in flow connection with a suction space 32 which extends around the tool holder 29. If a machine side 41 of the sanding plate 40 is subjected to negative pressure or suctioned off, so that there is Existing outflow openings 43 for the dust air S, which are located in the suction chamber 32, are subjected to negative pressure.

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

The throughflow openings 33 are provided on an edge region 47 of the grinding plate 40. A suction zone 44 in the center of the grinding plate 40, that is to say a suction zone which extends around the drive holder 49, is delimited by a sealing arrangement 35 which also encompasses or houses the suction space 32.

The sealing arrangement 35 comprises a counter-sealing element 36 of the grinding machine 15, which, when the grinding plate 40 is mounted on the grinding machine 15, rests in a sealing manner on a sealing element 80 of the grinding plate 40. The counter-sealing element 36 comprises, for example, an elastic ring body 37, in particular a type of sealing collar. The ring body consists for example of elastic plastic, rubber or the like. The counter sealing element 36 can have displacement contours, beads or the like, so that it is deformable relative to the essentially rigid or inelastic sealing element 80.

In order to reduce wear of the counter-sealing element 36, contact bodies 38 are embedded in the ring body 37 and slide along the sealing element 80 of the grinding plate 40. The contact body 38 are made of a harder material than the ring body 37 and include, for example, metal pins.

The processing surface 45 of the grinding plate 40 is arranged on its processing side 42. There are also inflow openings 48 for the inflow of dusty air S. The inflow openings 48 communicate with Durchgangskanä len 59 of the grinding plate 40, which are flow-connected to the outflow openings 43. The sealing element 80 extends on the machine side 41 around the suction zone 44. In the interior of the suction zone 44, the Ausströmöffnun conditions 43, which open into the suction space 32, so to speak, are arranged. The sealing element 80 thus surrounds the suction zone 44 in an annular manner. Radially outside be with respect to the drive bracket 49, i.e. between the edge region 47 or the outer circumference of the grinding plate 40 and the sealing element 80, an outer zone 46 is provided, which is closed to the machine side 41, namely by a cover element 70 Drive holder 49, i.e. in the edge region 47, a rib structure 45 of the sanding plate 40 is open, but not towards the side 41, but also towards the outer edge of the sanding plate 40, so that no dust deposits or the like are to be feared there.

The sanding plate 40 experiences its rigidity essentially through the plate body 50, which is essentially rigid. For example, the plate body 50 is made of metal, a thermosetting plastic or the like. In addition, the plate body 50 is stiffened by the rib structure 45.

The plate body 50 is provided on its machine side 51 with a multiplicity of cavities 57 which are located between ribs 56 of the rib structure 55. The cavities 57 result essentially from the removal of the plate body 50 from the mold as part of a casting process, for example when a casting core GK (shown schematically in FIG. 3) is removed from a respective cavity 57. Thus, spaces between the ribs 56, therefore cavities 57, are open, while sections of a support wall 54 extend between the ribs 56 on the processing side 52 of the plate body 50.

At this point, however, it should be mentioned that the support wall 54 has a plurality of recesses 59A, which communicate with the inflow openings of the grinding plate 40 or form them. Sections of the recesses 59A can be represented by inflow openings 58, for example. The through channels 59 communicate with outflow openings 53 on the machine side of the Plattenkör pers 50, so that dusty air that enters the recesses 59A or the Einströmöff- openings 58 flows in through the passage channels 59 to the flow openings 53 from can flow.

To the extent that the plate body 50 is open on its machining side 52 due to the recesses 59A, it is in any case closed or covered by a cover body 560.

The cover body 560 is arranged with its machine side 61 on the machining side 52 of the plate body 50, for example glued to the plate body 50, connected in a form-fitting manner (not shown) or the like.

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

On its processing side 62, the cover body 560 preferably has an adhesive layer 66, for example a Velcro layer, an adhesive layer or the like, for an abrasive 90, in particular an abrasive sheet 90A. Of course, instead of the adhesive layer 66, an abrasive, for example a grain, an abrasive fabric or the like, could be directly arranged.

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

The cover element 70 extends into the outer zone 46 and there covers the rib structure 55 on the machine side. Thus, no dust or the same other undesirable material can penetrate into the cavities 57 of the outer zone 46. The cover element 70 also essentially covers the cavities 57 of the rib structure 55 radially inward with respect to the sealing element 80. A processing side 72 of the cover element 70 rests on the ribs 56 and can, for example, be glued and / or welded to them, for example thermally welded.

In the exemplary embodiment, the cover element 70 is held in a form-fitting manner on the plate body 50, namely by the sealing element 80. Thus, for example, throughflow openings 73 of the cover element 70 are aligned with the outflow openings 53 of the plate body 50, so that they can represent the outflow openings 43 of the grinding plate 40. The cover element 70 is not only provided in the area of the outer zone 46 to cover part of the cavities 57, but also in the suction zone 44. There, the cover element 70 covers all cavities 57 of the rib structure 55, apart from the outflow openings 53 and the drive holder 49, for the through-flow opening 73 or through-openings 79 are provided.

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

The sealing element 80 has a sealing body 83A, which has a passage opening 83 and thus has an annular shape. The inner circumferential contour of the sealing body 83A delimiting the passage opening 83 delimits the suction zone 44. On the sealing body 83A, which is, for example, wall-like or plate-like, a sealing surface 83B is provided on the machine side 81 of the sealing element 80, on which the counter-sealing element 36 can rest in a sealing manner , so for example can grind along.

The holding projections 89 penetrate the holding receptacles 78 or passage openings of the holding element 70 and protrude freely into the cavities 57. Of course, there could be plug receptacles or the like other form-fitting retaining contours can be provided for the retaining projections 89, so that the sealing element 80 can be fastened in a form-fitting manner directly to the plate body by means of the retaining projections 89. Such a form-fitting support enables, for example, support against a direction of force F which extends parallel to the machining surface 45. Thus, for example, a torque which the sealing elements 36 and 80 sliding against one another generate, is supported on the plate body 50.

The sealing element 80 is connected directly to the plate body 50 in a form-fitting manner with latching means 84, namely latched. The latching means 84 comprise form-fit projections 85 which protrude towards the machining side 82 of the sealing element 80 and engage positively in the form-fit receptacles 95 of the plate body 50. The form-locking projections 85 and the form-locking devices 95 are, for example, plug-in projections and plug-in receptacles.

The form-fit projections 85 could now engage in the form-fit receptacles 95, for example in a press fit, which results, for example, from the fact that the form-fit projections 85 have slots 85C, 85D, so that plug-in segments 85A, 85B are formed which are transverse to a plug-in axis SA and relative to one another are movable away from each other. In particular, such a press fit is provided on lateral support surfaces 98 of the form-fit receptacle 95, with which the respective form-fit projection 85 is supported on the form-fit receptacle 95 to support the force F. The support surfaces 98 support, for example, a foot region of a respective form-fitting projection 85 with which the latter is connected to the sealing body 83A.

The form-fit projections 85 are designed, for example, in the form of retaining pins that mesh with the retaining receptacles or form-fitting receptacles 95.

Opposite to a plug axis direction, along which the form-fit projections 85 are inserted into the form-fit receptacles 95, rear gripping surfaces 97 are provided. The rear gripping surfaces 97 are located in an expanded Section 96 of a respective form-fit receptacle 95, into which a head region 86 of a respective form-fit projection 86 engages. The head region 86 also has flinter gripping surfaces 87 which protrude transversely to the plug axis SA in front of the foot region or foot portion of a respective form-fitting projection 85. The form-fit projections 85 are thus supported in a form-fitting manner in the form-fit receptacles 95 in the sense of removing the sealing element 80 from the plate body 50. When the interlocking projection 85 is inserted into the interlocking receptacle 95, the plug-in segments 85A, 85B are displaced in the direction of the slots 85C, 85D or in the sense of a narrowing of the slots 85C, 85D towards one another, so that the head regions 86 past the support surfaces 98 into the extended section 96 of the form-fit receptacle 95 and lock there with the form-fit receptacle 95.

The slots 85C, 85D run, for example, in the shape of a cross and / or at an angle to one another. In addition or as an alternative to the latching means 84, the sealing element 80 can also be glued to the plate body 50.

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

The interlocking projections 85 are arranged at angular distances, preferably equal or equidistant angular distances, on the sealing element 80 and protrude toward the machining side 82 thereof. The interlocking projections 85 penetrate through openings 75 of the cover element 70, so that this is held in a sandwich-like manner between the sealing element 80 and the plate body 50.

The fold contours 88 or fold projections 89 form additional fold elements which fix the cover element 70 with respect to the plate body 50. The holding Projections 89 are, for example, also arranged at angular distances from one another, in particular regular angular distances from one another. It can be provided that a holding projection 89 is provided next to or on each, preferably only every second, form-fit projection 85. Instead of the cover body 560, on which an abrasive in the form of the sanding sheet 90A can be arranged directly, a cover body 60 can also be provided.

The cover body 60 is fastened with a machine side 61 to the plate body 50, for example glued to it or detachably connected to it, which will become even clearer below. For example, a support wall body 64 of the cover body 60 rests against the plate body 50.

On a processing side 62 opposite to the machine side 61, the cover body 60 has a processing wall body 65 which is used to fasten and carry the abrasive means 90, in particular the abrasive means 90A. On the processing wall body 65, for example, an adhesive layer 66 is arranged, which can be connected to the adhesive layer 94 of the abrasive 90, for example in the manner of a Velcro connection.

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

The support wall body 64 and the processing wall body 65 have flat sides 64F, 65F facing away from one another, of which the flat side 64F of the support wall body 64 is intended and designed to rest against the plate body 50 of the grinding plate 60, 160 and the flat side 65F of the processing wall body 65 has the adhesive layer 66 having The cover body 60 has through-flow openings 63 which, when the cover body 60 is mounted on the plate body 50, are aligned with the inflow openings 58, so that dust air S flowing into the cover body 60 through the through-flow openings 93 of the grinding means 90 enters the inflow openings 63E of the cover body 60 flows in and flows through through-flow openings 63, flows out of flow openings 63A of the cover body 60 and can further flow through the plate body 50.

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

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

On a plate body 150 of a sanding plate 140, however, the cover body is advantageously releasably fastened by 60, namely for example by means of screws 68B, which are inserted through openings 68 of the cover body 160 and in screw receptacles 68D of the plate body 150, which are arranged on its processing side 52, are screwed in. The screws 68B have screw heads 68C which are supported on the machining side 62 of the cover body 60, which is designed as a flat side. In contrast to what is shown in the drawing, but indicated by dash-dotted lines in FIG. 14, the screw heads 68C dip into the machining side 52 or the machining wall body 65 in such a way that troughs in which the screw heads 68C are accommodated are formed and each other results in a substantially flat surface 62B on the machining side 62. To form such depressions, slots 68A extend from the through openings 68, for example star-shaped, which enable or facilitate a deformation or depression of the cover body 60 in the area of the screw heads 68C.

The sanding plate 160 has the already mentioned plate body 150, which has a machine side 51 on which a drive holder 149 is provided.

The drive holder 149 is used to attach a tool holder 129, which has certain differences compared to the tool holder 59, but also has an eccentric bearing device 27. Retaining projections 29A, on which screw receptacles 29B are arranged, are provided on their outer circumference. The retaining projections 29A are preferably positively received in the drive bracket 149, for example using suitable receiving contours.However, this is not absolutely necessary because screws 29C are provided that penetrate the openings 29D of the plate body 150 and are screwed into the screw receptacles 29B.

The plate body 150 is constructed similarly to the plate body 50, i.e. has a support wall 54 and inflow openings 58 on its processing side, which are flow-connected via through channels 59 to outflow 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 to the machine side 51, i. H. that between ribs 156 of the rib structure 155 cavities 57 are present. These cavities 57 are also covered on the machine side 51 in the case of the plate body 150 and thus the grinding plate 140, so that dust and the like, other undesirable material, do not penetrate into the cavities 57.

The sanding pad 160 has a sealing element 180 which is integrally encompassed by a cover element 170. A machine side 81 of the sealing element 80 is used to ensure that the elastic ring body 37 and / or the counter-sealing element 36 lies against it in a sealing manner. For the sealing abutment of the counter-sealing element 36, an annular sealing surface 83B is provided on a sealing body 83A of the sealing element 180 and extends around a through opening 83 of the sealing element 180. Radially on the outside, the cover element 170 is arranged on the sealing element 180, which annularly surrounds the sealing element 180 with an annular body 174 which has an annular shape.

The sealing element 180 is connected to the plate body 150 by means of a weld and essentially covers its cavities 57, separated hen of rib structures open radially outward with respect to the sanding plate 140.

Both the sealing element 180 and the cover element 170 are plate-shaped. The sealing element 180 protrudes in front of the cover element 170 in a sense away from the plate body 150. Holding contours 188 can be provided on the sealing element 180, for example holding projections which engage in the plate body 150, for example be supported on the ribs 156 of its rib structure 155.

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, which advantageously and / or at least during an assembly process and / or welding process of the two components interlock positively and hold the two components relative to one another so that the The welding explained below succeeds with optimal accuracy. For example, form-fit 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 that engage in form-fit receptacles 178 of the cover element 170. The pairings of form-fit receptacle 170 and form-fit projections 158A are provided at angular intervals with respect to the axis of rotation or center axis of the grinding plate 140.

On the processing side 82 of the sealing element 180 and on the processing side 72 of the cover element 170, ie on the same side of both components, welding projections 185 are provided, which are supported on the ribs 156 and are connected to them by means of ultrasonic welding. The welding projections 185 extend partially annularly around Ausströmöff openings 53 of the plate body 50 and close to that extent passage channels 59 through which dust air flowing in via inflow openings 58 on the processing side 52 of the plate body 50 can flow. The course of the welding projections 185 is adapted to the course of the ribs 156 and, for example, points approximately parallel to the outer circumference of the drive holder 149 running portions 185A, of which portions 185B extend away in the direction of the drive bracket 149 and run up to this.

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 holder 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 these ver. However, welding projections 177, for example punctiform welding projections, are provided radially outward with respect to the axis of rotation of the grinding wheel 140 on the machining side 72 of the cover element 170 and are welded to the material of the plate body 150. For example, several in the circumferential direction with respect to the axis of rotation of the grinding plate 140 ne side by side arranged at angular intervals welding projections 177 vorgese hen. The welding projections 177 are arranged on the radially outer edge region of the cover element 170 with respect to the axis of rotation of the grinding plate 140.

Several, for example four, welding projections 177 form, for example, a welding projection group. Between the welding projection groups of welding projections 177 there are preferably angular distances at which no welding projections are provided. The welding projections 177 preferably form a plurality of arrays.

Using the example of a sealing element 180A, which in principle corresponds to the sealing element 180 including the cover element 170 arranged thereon, there are welding projections which have a linear shape and also enable optimal welding to the plate body 150 in the area of the cover element 170. For example, there are circumferential welding projections 185D which extend on the outer circumference of the cover element 170. Annular welding projections 185E also extend, for example, around the screw receptacles 86D. Furthermore, further welding projections 185C run radially outwards in a star shape in the area of the cover element 170. Overall, the welding protrusions of the sealing telements 180 basically have a rib-like shape, which is, so to speak, complementary to the rib structure 155 and thus come to rest on or next to the end faces of the ribs 156. With a correspondingly powerful welding system, for example with 20 kilowatts and more, elongated welding projections and a large number of welding projections, such as the 180A sealing element, can also be ultrasonically welded.

The cushion body 67 of the cover body 60 is free on the outer periphery 69 of the cover body 60. As a result, it is not protected, for example, from damage if the sanding plate 140 hits an obstacle.

To remedy this problem, alternative cover bodies 60A, 60B, 60C, 60D, 60E, 60F, 60G are provided, 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, namely by protecting the cushion body 67 by the connecting device 100A-100G, possibly also referred to as connecting device 100 in the following for the sake of simplicity. The basic structure of the cover bodies 60A, 60B, 60C, 60D, 60E, 60F, 60G corresponds to the cover body 60, i. H. they have support wall body 64 and processing wall body 65, between which a cushion body 67 is sandwiched.

For example, a seam 101 is provided in the cover body 60A, which directly connects the support wall body 64 and the processing wall body 65 to one another. The seam 101 is preferably designed as a zigzag seam. It is particularly advantageous if the seam 101 is designed as a kind of edging.

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

The support wall body 64 and the machining wall body 65 are, so to speak, connected to one another at the edge by the connecting device 100A. A An advantageous effect is that the connecting device 100A, in particular the seam 101, forms a peripheral portion 69B on the outer periphery 69, in which or on which the wall bodies 64 and 65 are arranged directly next to one another and are firmly connected to one another. Proceeding therefrom, an inclined section 69A of the outer circumference 69 extends as far as a planar or essentially planar fastening plane 69C, which is provided for fastening the abrasive 90. The inclined part 69A runs obliquely with respect to the fastening plane 69C.

The fastening plane 69C is preferably a plane plane in front of which the heads of the screws 68B do not protrude, namely by dipping into the slots 68A or depressions of the cushion body 67.

As an alternative or in addition to the seam 101, a cohesive connection 101 A, for example welding, gluing, etc., is also possible, for example. In all these cases, the wall bodies 64 and 65 are directly connected to one another, so that the cushion body 67 is enclosed on the outer circumference 69 and is not free.

In order to be able to better form the inclined part 69A, a cavity 67A between the cushion body 67 and the outer circumference 69 is provided, for example. This is the case, for example, with a cover body 60A2.

The fastening plane 69C and / or a middle or central area or central area 69Z or the largest area of the processing side 62 of the cover body 60A is advantageously designed in such a way that there is no connection between the cushion body 67 and the support wall body 64 and the processing wall body 65, For example, no part of the connecting device 100 is provided, that is to say, for example, no seam, no material connection or the like. Although this would be possible in principle, it would, under certain circumstances, have the consequence that the fastening plane 69C would have depressions or similar other depressions. In the case of a connecting device 100B, an annular body 102 is provided which, so to speak, clasps the supporting wall body 64, the machining wall body 65 and also the supporting wall 54. The ring body 102 has, for example, a circumferential wall section 102A, from which leg sections 102B, 102C protrude at an angle, for example at right angles. As a result, a U-shaped receptacle is formed in which a peripheral portion 65A of the machining wall body 65 as well as a peripheral portion 64A of the support wall body 64 are received.

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

A connecting device 100C has a similar concept to the connecting device 100B, in which, in contrast to the annular body 102, an annular body 103 only clamps the support wall body 64 and the machining wall body 65 to one another, so to speak. The ring body 103A has a circumferential wall section 103 from which leg sections 103B and 103C protrude at an angle, so that a receptacle is thereby formed in which the circumferential portions 65A of the supporting wall body 64 and the machining wall body 65 are received.

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

The plate body 150C is, however, 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 member 104A and a Ring elements 104B are, for example, welded to one another and / or glued to one another, for example in the area of a peripheral portion 104E of ring element 104A. From this circumferential part 104E, a circumferential wall section 104C extends in a direction away from the ring element 104B, while a leg 104B in turn lies opposite the ring element 104B, so that between these two last-mentioned components there is a receptacle into which the circumferential wall parts 64A and 65A engage or in which they are recorded.

An alternative concept to this is implemented in a connecting device 100E, the ring body 105 of which has ring elements 105B and 105C which sandwich the peripheral parts 64A and 65A and connect them to one another. The ring elements 105B and 105C are, for example, ring-shaped, in particular circular, plate bodies or wall bodies, the end faces or flat sides of which lie opposite one another, with the peripheral part 65A of the processing wall body 65 and the one peripheral part 64A of the supporting wall body 64 being received between the end faces or flat sides.

For example, the ring elements 105B and 105C are connected to one another by connecting bodies 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 and thus firmly connect all components to one another. As a result, the cover body 60E is compressed on its outer circumference 69 and is hard and advantageously shockproof. It would also be conceivable, however, that the ring elements 105B and / or 105C are not provided, in which case the connecting bodies 105A connect peripheral parts 64A and 65A directly to one another. It can be provided that only one of the ring elements 105B and / or 105C is present.

However, a relatively soft outer circumference of the cover element 60F also offers optimal protection for the cushion body 67. For example, an annular body 106 of the connecting device 105 is made of an elastic material, for example plastic, rubber or the like. The ring body 106 has a peripheral wall 106A, which preferably have wall portions 106B which are movable relative to one another. For example, the wall sections 106B are aligned in a V-shape or are in a V-shape relative to one another. From the peripheral wall 106A wall sections 106C and 106D extend away, which are connected to the supporting wall body 64 and the peripheral wall body 65 in order, for example cohesively, glued or the like.

Furthermore, a portion 106E of the ring body 106 engages in the previously explained receptacle 64A of the plate body 150C. It is advantageous if the plate body 150C with the supporting wall 64 protrudes approximately up to the peripheral wall sections 106D and 106C, so that it can provide additional mechanical protection for the cushion body 67.

However, a material that is more wear-resistant than the cushion body 67 but is nevertheless flexible and accommodated between the wall bodies 64 and 65 can represent a connecting device, as is the case with the connecting device 100G. There, for example, an annular body 107 is formed from a foam material which is more wear-resistant than the foam material of the cushion body 67, for example harder, and / or with closed pores or the like. The ring body 107 extends as far as the outer circumference 69, where it is open at the end, that is, it is not covered by the support wall body 64 or machining wall body 65, for example. However, 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. A thickness of the ring body 107 is advantageously selected so that it is smaller than a thickness of the cushion body 67, the thickness being the distance between the support wall body 64 and the Bear processing wall body 65 represents. Thus, from the central area or main surface area of the cover body 60G, an inclined part 69A runs to a peripheral part 69B, which is set back with respect to the central area.

It can be seen that the support wall body 64 is not necessary in all cases. For example, it would be possible in the exemplary embodiment of the covering body 60C for no support wall body 64 to be present, in which case the ring body 103 the processing wall body 65 connects directly to the support wall 54, so that the cushion body 67 is enclosed between the support wall 54 and the processing wall body 65. In this case, the ring body 103 provides sufficient protection on the outer circumference 69. Such a procedure is also possible in the other exemplary embodiments, that is to say that there is no supporting wall body. For example, in the embodiment of the cover body 60A, the processing wall body 65 can be connected directly to the plate body 50, ie the support wall 54, on the Außenum catch 69, for example by a seam, a weld or the like.

Claims

Expectations

1.Sanding plate for a grinding machine (15), with a drive holder (49) arranged on its machine side (41) for non-rotatable attachment to an output (26) of the grinding machine (15), so that the grinding plate (40) passes through the grinding machine (15) ) can be driven into a grinding movement suitable for grinding machining of a workpiece (W), in particular rotary and / or eccentric, the grinding plate (40) having a machining side (42) opposite to the machine side (41) with a machining surface (45) has, on which a grinding means (90) for the abrasive processing of a workpiece (W) can be fixed or detachably arranged by means of an adhesive layer (66), with inflow openings (48) on the processing surface (45) for the inflow of dust-laden air (S. ) and on the machine side (41) there are arranged flow-connected outflow openings (43) via passage channels (59), the outflow openings (43) in a suction zone (4th 4) are arranged within an annular sealing element (80) arranged on the machine side (41) for the sealing contact of a counter-sealing element (36) of the grinding machine (15), the grinding plate (40) having a plate body (50) which has a supporting wall (54) provided for carrying the abrasive (90), which is stiffened by a rib structure (55), the ribs (56) of which protrude to the machine side (41) in front of the supporting wall (54), the ribs (56 ) delimit cavities (57) which are closed to the processing side (42) by the supporting wall (54) and which are open to the machine side (41), characterized in that the sealing element (80) faces at least some of the cavities (57) to the machine side (41 ) covers.

2. Sanding pad according to claim 1, characterized in that the sealing element (80) and the plate body (50) are in one piece or the Dichtungsele element (80) and the plate body (50) are separate, firmly connected components.

3. Sanding pad according to claim 1 or 2, characterized in that at least one cavity (57) covered by the sealing element (80) on the machine side (41) is a mold release cavity, which is created by removing a cast core (GK) from the cavity ( 57) is formed. 4. Sanding pad according to one of the preceding claims, characterized in that the sealing element (80) apart from the Ausströmöffnun gene (43) all cavities (57) of the plate body (50) within the suction zone (44) and / or on a flat Flat side of the plate body (50) and / or between the drive holder (49) and an edge region (47) of the plate body (50) is covered and / or sealed.

5. Sanding pad according to one of the preceding claims, characterized in that the sealing element (80) apart from the Ausströmöffnun gene (43) at least part of the cavities (57), preferably all cavities (57), tightly closes, so that one in the volume located in each cavity (57) is sealed in a dust-tight manner.

6. Sanding pad according to one of the preceding claims, characterized in that the sealing element (80) has at least one, several or all of the cavities (57) and / or at least one or all of the through channels provided for forming one or more through channels (59) (59) covered and / or closed tightly.

7. Sanding pad according to one of the preceding claims, characterized in that the sealing element (80) rests flat on the end faces of the ribs (56) facing the sealing element (80).

8. Sanding pad according to one of the preceding claims, characterized in that the sealing element (80) by means of a weld, in particular a special ultrasonic weld, and / or an adhesive bond to the plate body (50), in particular the ribs (56), connected is.

9. Sanding pad according to one of the preceding claims, characterized in that the sealing element (80) and / or the plate body (50) at least one welding projection, in particular a welding tip, for welding to the respective other component of the sealing element (80) or Have plate body (50) or are welded to the other component of the sealing element (80) or plate body (50) using the at least one welding projection.

10. Sanding pad according to one of the preceding claims, characterized in that the plate body (50) and the sealing element (80) are positively supported on one another in a force direction (F) parallel to the machining surface (45).

11. Sanding pad according to one of the preceding claims, characterized in that the sealing element (80), in particular by means of Klemmmit devices and / or locking means (84) and / or a releasable adhesive, is detachably arranged on the plate body (50).

12. Sanding pad according to one of the preceding claims, characterized in that the sealing element (80) and the plate body (50) are positively connected to each other by at least one pairing of a form-fitting projection (85) and a form-fitting receptacle (95), which are transversely extend, in particular perpendicular, to the machining surface (45) and engage in one another.

13. Sanding pad according to one of the preceding claims, characterized in that the sealing element (80) has at least one support contour, in particular a support receptacle and / or a support rib protruding in front of the sealing element (80), for lateral contact with a cavity ( 57) delimit the rib (56).

14. Sanding pad according to claim 13, characterized in that the log processing element (80) has two spaced-apart support contours and / or welding projections, in particular support ribs, which for contact with one another the opposing ribs (56) delimiting a cavity (57) are provided or delimit a receptacle for engaging a rib (56).

15. Sanding pad according to claim 13 or 14, characterized in that the at least one support contour or the at least one welding projection has at least two support contours or welding projection, in particular support ribs, which run at an angle to one another, for support on ribs (56) which are angled to one another.

16. Sanding pad according to one of claims 13 to 15, characterized in that the at least one support contour or the at least one welding projection has a support frame for lateral contact with an inner circumference of a cavity (57) delimited by ribs (56) of the rib structure (55) includes.

17. Sanding pad according to one of claims 13 to 16, characterized in 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 plate body (50).

18. Sanding pad according to one of the preceding claims, characterized in that it has a cover element (70) which covers at least part of the cavities (57) towards the machine side (41).

19. Sanding pad according to claim 18, characterized in that the cover element (70) on the plate body (50) in a form-fitting manner and / or based on the

Sealing element (80) and / or is held by means of an adhesive bond and / or is integrally or firmly connected to the sealing element (80) or is formed by the sealing element (80).

20. Sanding pad according to claim 18 or 19, characterized in that the cover element (70) has openings, in particular passage openings (78) and / or

Flow openings (73) for form-locking elements with which the sealing element (80) and the plate body (50) are positively fixed to one another, and / or for engaging holding contours (88) of the sealing element (80) and / or for the flow of dust air (S) and / or for the drive holder (49).

21. Sanding pad according to one of the preceding claims, characterized in that the sealing element (80) and / or the one or more of the cavities (57) of the plate body (50) at least partially covering the cover element

(70) apart from the outflow openings (43) for the dust air (S) outside and / or inside the suction zone (44) cover all cavities (57) of the Plattenkör pers (50) on the machine side (41) that catches with respect to an outer circumference (69) of the plate body (50) between the machine side (41) and the processing side (42) and / or to an outer edge of the sanding plate (40) are closed.

22. Sanding pad according to one of the preceding claims, characterized in that at least some of the ribs (56) of the plate body (50) extend radially or radially away from the drive holder (49) to an edge region (47) of the sanding pad (40) ) extend.

23. Sanding pad according to one of the preceding claims, characterized in that at least some of the ribs (56) of the plate body (50) extend to a common support plane (SE) in which the ribs (56) the device element (80) and / or support the cover element (70). 24. Sanding pad according to one of the preceding claims, characterized in that the supporting wall (54) of the plate body (50) on the processing side (42) has recesses (59A) to form the inflow openings (48) and / or to provide at least partial sections the through channels (59) has. 25. Sanding plate according to one of the preceding claims, characterized in that the processing surface (45) of the sanding plate (40) is provided directly by the support wall (54) or on the support wall (54) having a processing surface (45), in particular Recesses (59A) on the Plate body (50) closing, cover body (60, 60A-60G, 560) is arranged.

26. Sanding pad according to claim 25, characterized in that the cover body (60, 60A-60G, 560) has an elastic and / or resilient cushion body (67) or is formed thereby and / or the cover body (60, 60A-60G, 560) covers and / or throughflow openings (63) for dusty air (S) and / or through-flow openings (63) on the processing side (42) completely or away from an edge area and / or throughflow openings (63) removed from the drive holder (49) and removed from the drive holder (49) and provided for engaging behind the grinding means (90) / or that the cover body (60, 60A-60G, 560) has the abrasive means (90) or the adhesive layer (66) for the detachable attachment of the abrasive means (90) to the grinding plate (40).

27. Sanding pad according to claim 25 or 26, characterized in that the cover body (60, 60A-60G, 560) is releasably attached to the plate body (50) by means of fastening bolts, in particular screw bolts.

28. Cover body (60A-60G) for a sanding plate (40) or as part of egg nes sanding plate (40), wherein the sanding plate (40) is designed in particular according to one of the preceding claims, wherein the cover body (60A-60G) as a cushion is designed and has a support wall body (64) and a processing wall body (65) between which an elastic and / or resilient cushion body (67) is sandwiched, wherein the support wall body (64) and the processing wall body (65) facing away from each other flat sides ( 64F, 65F), of which the flat side (64F) of the supporting wall body (64) is intended and designed to rest against one or the plate body of the grinding plate and the flat side (65F) of the processing wall body (65) is an abrasive (90) or has an adhesive layer (66) for detachable fastening of an abrasive (90), characterized in that the machining wall body (65) and the supporting wall body (64) on an outer surface circumference (69) of the cover body (60A-60G) are connected to one another by a connecting device (100A-100G), so that the cushion body (67) through the support wall body (64), the processing wall body (65) and the binding device (100A-100G) on the outer circumference (69) of the cover body (60A-60G) is protected against mechanical damage.

29. Cover body according to claim 28, characterized in that the supporting wall body (64) and / or the processing wall body (65) consist of a different and / or more tensile and / or more shockproof and / or denser and / or harder material than the cushion body (67).

30. Cover body according to claim 28 or 29, characterized in that the support wall body (64) and / or the processing wall body (65) consist of a textile material. 31. Cover body according to one of claims 28 to 30, characterized in that the connecting device (100A-100G) comprises a seam (101) or the spaced-apart connecting body or is formed by a seam (101) or spaced-apart connecting bodies, wherein the Seam (101) or the connecting body connect the support wall body (64) and the processing wall body (65), in particular directly, to one another.

32. Cover body according to one of claims 28 to 31, characterized in that the connecting device (100A-100G) comprises a material connection or is formed by a material connection (101 A), in particular a welded connection and / or an adhesive connection, wherein the material connection (101A) connects the support wall body (64) and the processing body, in particular directly, to one another.

33. Cover body according to one of claims 28 to 32, characterized in that the connecting device (100A-100G) comprises at least one ring body (102-107) which at least partially surrounds the outer circumference (69) of the cover body, in particular comprises a clasp-like.

34. Cover body according to claim 33, characterized in that the at least one ring body (102-107) at least one of the cushion body (67) on the outer circumference (69) of the cover body (60A-60G) covering wall section (102A) and / or at least one leg section (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 plate body of the grinding plate is supported. 35. Cover body according to claim 33 or 34, characterized 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 plate body and / or opposing and, in particular by connecting bodies and / or rivets and / or bolts, annular bodies (102-107) connected to one another, between which the machining wall body (65) and the supporting wall body (64) are held in a sandwich-like manner.

36. Covering body according to one of claims 33, 34 or 35, characterized in that the at least one ring body (102-107) is sandwiched between the supporting wall body (64) and the machining wall body (65) or one between the supporting wall body (64) and the machining wall body by (65) arranged portion.

37. Cover body according to one of claims 33 to 36, characterized in that the ring body (102-107) is elastic or has an elastic part and is deformable by a force acting on the processing wall body (65) in the direction of the support wall body (64) is.

38. Cover body according to one of claims 28 to 37, characterized in that it has a large central area (69Z) in which the cushion body (67) is arranged and around which the connecting device (100A-100G) extends, and that in the central area (69Z) there is no connection between the processing wall body (65) and the supporting wall body (64) which penetrates the cushion body (67).

39. Cover body according to one of claims 28 to 38, characterized in that the processing wall body (65) has a large central area (69Z), in which the processing wall body (65) further in front of the Support wall body (64) protrudes than on the outer periphery (69) of the cover body (60A-60G).

40. Covering body according to one of claims 28 to 39, characterized in that inflow openings (63E) for dust air are arranged on the flat side (65F) of the processing wall body (65), which with outflow openings (63A) on the flat side (64F) of the support wall body (64) are connected via through channels (63).

41. Cover body according to one of claims 28 to 40, characterized in that between the cushion body (67) and the outer circumference (69) of the cover body (60A-60G) a through the support wall body (64) and the processing wall body (65 ) chambered cavity (67A) is present.

42. Grinding machine (15) with a drive motor (25) for driving a drive (26) and with a sanding plate (40) for attachment to the output (26) according to one of claims 1 to 27 and / or with a sanding plate (40 ), on which a cover body according to one of claims 28 to 41 is arranged, wherein the grinding machine (15) has a counter-sealing element (36) for resting on the grinding plate (40) and / or the sealing element (80) of the grinding plate (40) having.

43. Grinding machine (15) according to claim 42, characterized in that the counter-sealing element (36) has an elastic ring body (37) made of an elastic material.

44. Grinding machine (15) according to claim 43, characterized in that in the ring body (37) at least one abutment body (38) provided for abrading abutment on the sealing element (80) made of a material that is harder than the elastic material, in particular from Metal, is embedded.

45. Grinding machine according to one of claims 42 to 44, characterized in that it has an eccentric bearing device (27) for eccentrically driving the grinding plate (40).