Polishing pads and sanders having sealing elements and rib structures

Abstract

The present invention relates to a polishing pad 40 of a sander 15, the polishing pad 40 having a drive holder 49 located on the machine side 41 of the polishing pad and fixed non-rotatably to the drive 26 of the sander 15 so that the polishing pad 40 can be driven by the sander 15 in a particularly rotary and / or eccentric polishing motion suitable for polishing a workpiece W. The polishing pad has a working side 42 opposite the machine side 41, the working side 42 having a working surface 45 on which a polishing means 90 for abrasively polishing the workpiece W can be fixedly or removably arranged using an adhesive layer 66. A plurality of inlet openings 48 for the inflow of dusty, dirty air S are located on the working surface 45, and a plurality of outlet openings 43 fluidly connected to the inlet openings via passages 59 are located on the machine side 41. The outlet openings 43 are located in a suction area 44 inside an annular sealing element 80 located on the machine side 41 for sealing contact with the opposing sealing element 36 of the sander. The polishing pad has a flat body 50 with a support wall 54 provided for supporting a polishing means 90, said support wall being reinforced by a rib structure 55, with a plurality of ribs 56 projecting beyond the support wall 54 towards the machine side 41. The ribs 56 define cavities 57 closed by the support wall 54 towards the working side 42 and open towards the machine side 41. The invention also relates to a sander including a polishing pad of this type. According to the invention, a sealing element 80 covers at least some of the cavities 57 towards the machine side 41.

Description

Technical Field

[0001] The present invention relates to a polishing pad for a sander having a drive device holder located on the machine side, wherein the polishing pad is suitable for polishing a workpiece and is drivable by a sander, particularly in a rotational polishing movement and / or an eccentric polishing movement. The drive device holder is fixed to the drive device of the sander so as not to rotate. The polishing pad has a working surface facing the machine side, and the polishing means for abrasive machining of the workpiece can be fixed or removably arranged using an adhesive layer. A plurality of inflow openings for dirty and dusty air to flow in are located on the working surface, and a plurality of outflow openings fluidly connected to the inflow openings via through-channels are located on the machine side. The outflow openings are located in a suction area inside an annular seal element located on the machine side for sealing contact with the opposite seal element of the sander. The polishing pad has a flat body having a support wall provided for supporting the polishing means, and the support wall is reinforced by a rib structure, and the ribs project towards the machine side beyond the support wall. The ribs define cavities that are closed by the support wall with respect to the machine side and open with respect to the machine side. The present invention also relates to a sander having a polishing pad of this type.

Background Art

[0002] Such a polishing pad is described, for example, in Patent Document 1. In the case of a known polishing pad, the flat body is designed as a support, and a soft pad is arranged on its lower side, thereby being directed towards the working side. The flat body is strengthened by a rib structure extending around the drive device holder. A seal element in the form of a running surface extends annularly around this rib structure, and an opposite seal element of the sander, such as a seal collar, is sealingly abutted thereon. When the polishing pad rotates, the collar slides along the seal element of the polishing pad, thus surrounding a suction area where dusty air can be sucked in.

[0003] The known concept of abrasive pads is intended to have ribs that are simply positioned internally and radially near the drive holder, while plate-like sealing elements or running surfaces are positioned externally and radially. The concept for reinforcement is therefore limited in the case of known abrasive pads.

[0004] A polishing pad known from Patent Document 2 has a flat body on which the polishing pad is placed, and a row of through-holes allows flow through the polishing pad from its processing side to its machine side. A covering suitable for guiding the flow through the through-holes is located on the machine side.

[0005] A polishing pad including a cushion having a chamber structure is known from Patent Document 3. A support plate is arranged in the chamber structure and covers the chamber structure.

[0006] Patent Document 4 describes a polishing plate having a base plate including a tool holder for driving a sander, and a cushion portion having an air passage on the underside of the base plate. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] DE102016100072A1 [Patent Document 2] US9302365B2 [Patent Document 3] DE202013010480U1 [Patent Document 4] DE102010012007A1 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] Therefore, the object of the present invention is to provide an improved polishing pad and a sander equipped with it. [Means for solving the problem]

[0009] To achieve this objective, in the polishing pad of the type described at the beginning, the sealing element is intended to cover at least several cavities facing the machine.

[0010] The basic concept of the polishing pad is that the rib structure exists in the area of ​​the sealing element, and also in the area of ​​the running surface for, for example, the opposite sealing element of the sander, and the gaps between the ribs are covered by the sealing element. As a result, the flat body and ultimately the polishing pad are also reinforced by the rib structure in the area of ​​the sealing element or in the radial distance to the drive holder of the sealing element. Nevertheless, the sealing element is located there.

[0011] Cavities of a flat body that are closed or covered by a sealing element are, in particular, cavities that are closed with respect to the radially outer edge region of the flat body by the material of the flat body.

[0012] The flat body preferably forms a hard component of the polishing pad that reinforces the polishing pad.

[0013] The flat body is preferably not made from a foamed material and / or foam.

[0014] The flat body is preferably made of hard plastic or rigid plastic or metal.

[0015] A flat body is advantageous because it is harder and / or more rigid with respect to the cover body positioned on the machining side, such as the polishing pad.

[0016] The rib structure is preferably integrated with the support wall. However, it is also possible to bond the rib structure to the support wall or the like using adhesive bonding, overmolding, or casting.

[0017] It is advantageous if the sealing element forms a first component part and a support wall having a rib structure, forms a second component part of the polishing pad, and the polishing pad is manufactured such that they are connected to each other or can be connected to each other.

[0018] Therefore, the rib structure already present on the support wall is at least partially covered by the sealing element during the manufacture of the polishing pad.

[0019] The flat body advantageously has a plurality of further ribs in the radially outer edge region with respect to the drive device holder, in particular a plurality of ribs of the type that extend star-shaped or radially from the center of the flat body or the polishing pad. Such ribs can have, for example, a strengthening function. It is also possible for the ribs to form flow channels. Between these ribs, there are preferably a plurality of recesses that are not covered by the sealing element. The radially outer edge region of the flat body is preferably not covered by the sealing element.

[0020] The sealing element can be, for example, plate-shaped. However, it is also possible for the sealing element to include a sealing collar or a part of a sealing collar. Therefore, the sealing element or the opposite sealing element or both can be designed as a colored or flexible sealing element.

[0021] During the operation of the sander, the sealing element and the opposite sealing element abut against each other by a sealing fit, and thus the suction region is wrapped or surrounded by the sealing element and the opposite sealing element.

[0022] The sealing element covering the cavity on the machine side is preferably only the sealing element for the sealing contact of the opposite sealing element of the sander or said opposite sealing element.

[0023] The flat body and / or the sealing element are preferably essentially hard, especially in the state where they are arranged relative to each other.

[0024] The sealing element preferably has a sealing surface that is designed as a plane or a flat surface and contacts the opposite sealing element. The sealing surface and the processing surface are preferably parallel to each other.

[0025] The sealing element preferably includes a ring body and / or a plate-like body or a wall-like body.

[0026] The flat body and / or the sealing element preferably consists of metal and / or a thermoplastic resin. The flat body and / or the sealing element consists of a material containing a fiber-reinforced material, for example, a glass fiber and / or a carbon fiber reinforced plastic. <{

[0027] The flat body is preferably designed on the machine side so that, without a sealing element covering at least part of the cavity, it has no sealing surface, particularly no annularly extending sealing surface around the drive device holder, for making sealing contact with the opposite sealing element or the opposite sealing element of the grinder. However, in principle, the flat body can have at least one additional sealing surface or a sealing contour that annularly extends around the drive device holder, in addition to the sealing element covering the cavity, for making sealing contact with the opposite sealing element of the grinder.

[0028] Both the sealing element and the opposite sealing element can be hard components or soft components or both. In particular, it is advantageous if the sealing element is plate-like or flat, that is, the component located on the polishing pad has a plate-like shape or a web-like shape. The opposite sealing element is preferably designed as a sealing collar or a sealing collar arranged in the tool holder of the grinder, for example, which can be engaged with the drive device holder of the grinder. For example, the tool holder of the grinder is particularly centrally located within the opposite sealing element and is thereby surrounded annularly. Of course, this structure is also advantageous in the polishing pad, that is, the drive device holder is centrally or at the center of the area of the sealing element.

[0029] The sealing element and the flat body may be integral. For example, the sealing element protrudes above the flat body or is integrally manufactured, for example, by an injection molding method.

[0030] A preferred concept is that the flat body and the sealing element are separate but fixedly connected components. The fixed connection is an immovable connection, such as a welded joint or adhesive joint. The fixed connection may also be a removable connection, such as a latching connection, clamping connection, positive engagement connection (interlocking connection, mating connection), or adhesive joint using a removable adhesive. However, the sealing element is fixedly positioned on the flat body during the operation of the polishing pad or for the operation of the polishing pad on the flat body.

[0031] At least one cavity covered by the sealing element of the polishing pad on the machine side is, advantageously, a demolding cavity formed by removing the casting core from the cavity. The flat body is manufactured, for example, by a mold and a core. The mold ultimately determines the formation of the support walls, while the core is necessary to form the rib structure. The casting cavity formed during casting or injection molding of the flat body is located between the mold and the core. When the core is removed from the mold, or in other words when the flat body is removed, cavities between the ribs of the rib structure are created.

[0032] The sealing element is advantageously intended to cover and / or tightly close all cavities of the flat body in the suction area between the drive holder and the edge region of the flat body and / or on the flat side of the flat body. For example, the flat body has a plurality of additional ribs outward or radially outward relative to the drive holder or sealing element, which are not covered or overlapped by the sealing element. The edge region preferably has a conical or inclined profile. The edge region preferably rises from the outer edge of the flat body to the region where the sealing element is located.

[0033] The sealing element is capable of covering all cavities or at least a large portion of cavities in the flat body, except for the outlet opening, and in particular, of tightly closing them. It is especially advantageous if the sealing element covers or tightly closes all cavities in the flat body that do not open radially outward relative to the flat body or the drive holder of the polishing pad, except for the outlet opening.

[0034] It is particularly advantageous if the sealing element completely and / or tightly closes at least one, preferably more than one, or all of the cavities.

[0035] A preferred concept is that the sealing element is intended to tightly close at least some of the cavities, preferably all or many of them, except for the outflow opening, so that the volume within each cavity is dustproof, enclosed, or surrounded.

[0036] The cavities of flat bodies closed by sealing elements are preferably completely closed by the sealing elements. Such closed cavities are closed, for example, by a rib structure, where multiple ribs of the rib structure form the circumferential wall of the cavity, and opposite sides of each other are closed by support walls and sealing elements. The support walls and sealing elements are connected to the ribs forming the circumferential wall, so that the cavity is completely closed.

[0037] The sealing element is preferably intended to cover and / or tightly close at least one, multiple, or all cavities provided and configured to form one or more passages and / or at least one or all passages. It is possible that multiple cavities away from the passages are covered by the sealing element but not completely tightly closed. Cavities covered by a sealing element that is not tightly closed, for example by welding or adhesive bonding, are also protected from dust ingress.

[0038] Therefore, although multiple cavities initially exist in the unprocessed flat body, these are covered or closed by sealing elements. The cavities are defined on first sides, e.g., two, three, or four sides, by, for example, ribs and support walls, and the sealing elements close at least one second side, e.g., a fourth, fifth, or sixth side. Thus, it is advantageous that the sealing elements, support walls, and ribs completely surround or enclose the volume of one or more cavities. Consequently, dust cannot enter each cavity while the polishing pad is in operation. As a result, mechanical properties, such as the balance and synchronization of the polishing pad, are not altered, or at least not altered, by dust that could otherwise accumulate in the cavities.

[0039] It is preferable that the sealing element rests flat on the end face of the rib structure facing the sealing element. This allows, for example, the volume in each cavity to be enclosed.

[0040] It is also advantageous if the sealing element is connected to the flat body, for example to its ribs, and especially to its end faces, by welding, such as thermal welding or ultrasonic welding. However, adhesive bonding can also be provided in addition to or instead of welding. Therefore, a permanent connection between the sealing element and the flat body is advantageous.

[0041] It is advantageous to provide so-called welding tips or welding projections for producing welds, particularly thermal welds. For example, it is advantageous for a sealing element and / or a flat body to have at least one welding projection, such as a welding tip or welding rib, or to be connected to each other by such a welding projection, for welding to other components of the sealing element and the flat body, respectively. The welding projection may be configured, for example, as a thin ridge. The at least one welding projection may be, for example, a so-called energy director. In the case of thermal welding, such as ultrasonic welding, the welding projection melts, thereby ensuring that the flat body and the sealing element are welded together.

[0042] The at least one weld projection may have an elongated shape. However, the at least one weld projection may also include, or be formed by, an arrangement of, for example, numerous weld spots or point-like weld projections.

[0043] The at least one welded projection or the welded connection formed by the welded projection is designed to be, for example, a frame or to form a frame. The at least one welded projection or the welded connection formed by the welded projection extends, for example, around an outlet opening of a flat body, so that when the at least one welded projection or the welded connection formed by the welded projection connects the sealing element to the flat body in the environment of the outlet opening, the outlet opening is sealed from the environment. In the end, for example, dusty air from the area of ​​the outlet opening cannot reach between the sealing element and the flat body.

[0044] The flat body and the sealing element are advantageously supported by a positive engagement in a force direction parallel to the machined surface or the geometric plane of the machined surface. For example, the positive engagement contours of the flat body and the sealing element fit together tightly. The positive engagement contour or positive engagement surface may include, for example, positive engagement projections and positive engagement housings in portions of the flat body and the sealing element, respectively. The positive engagement support can support torque generated between the flat body and the sealing element during operation using the sander. Such torque is generated, for example, when the sanding pad is driven by the sander, due to friction with the sealing element of the opposing sealing element and / or in the case of sanding contact between the machined surface and the workpiece.

[0045] In this regard, a sander can simply be described as a rotary grinding machine, meaning the grinding pad is designed and intended for rotary machining, abrasive machining, or sanding machining of a workpiece. However, it is also possible to configure the grinding pad as an eccentric grinding pad and the sander as an eccentric grinding machine. It is easily possible to adjust the operating modes, for example, by setting the sander to a rotational principle, an eccentric drive principle, or a hypercycloidal rotation drive principle, i.e., an eccentric rotation operation.

[0046] It is preferable that the sealing element is detachably positioned on the flat body, particularly by clamping means and / or latching means and / or removable adhesive bonding. The sealing element is essentially a separate component from the flat body, but it is detachably connected to the flat body. Therefore, for example, when the sealing element or the flat body wears out, the respective worn component can be easily replaced.

[0047] The sealing element and the flat body are purposefully connected to each other by a positive engagement via at least one pair of positive engagement projections and positive engagement housings, the positive engagement projections and housings extending transversely to the machined surface, particularly perpendicularly, and interlocking with each other. The at least one positive engagement projection is, for example, a positive engagement pin, and the at least one positive engagement housing is, for example, a positive engagement pin housing. Of course, the positive engagement projections may also have a wall-like structure. The positive engagement projections can be supported, for example, on the ribs of a rib structure, in which case the positive engagement housings are formed between the ribs. Each positive engagement projection can be supported in only one force direction on the wall of the positive engagement housing, for example, on the ribs of a rib structure. The apparatus of at least one pair of positive engagement projections and positive engagement housings or multiple pairs of positive engagement projections and housings can also be used as an assembly aid or temporary holder until, for example, welding or adhesive bonding is made between the sealing element and the flat body.

[0048] For the purposes of the operation, a latch pin or latch projection is provided as at least one positive engagement projection. The at least one positive engagement housing portion for the purposes of the operation includes a latch housing portion.

[0049] The at least one positive engagement projection may also be a plug projection (insertion projection), and the at least one positive engagement housing may be a plug housing (insertion housing). The plug projection is insertable into the plug housing along the plug shaft (insertion shaft). Of course, the plug housing may be designed as a latch plug housing, and the plug projection may be designed as a latch plug projection.

[0050] The plug housing and plug projection are purposefully provided with a plurality of rear gripping surfaces extending transversely to the plug axis, which obstruct or prevent the removal of the plug projection from the plug housing. The rear gripping surfaces may be aligned, for example, obliquely or perpendicularly to the plug axis. In particular, when the sealing element is subjected to force in the direction of the flat body, especially by the opposing sealing element, the rear gripping surfaces can normally be spaced apart from each other. However, it is preferable that the rear gripping surfaces fit together tightly, so that the sealing element is fixedly held to the flat body in the direction of the plug axis.

[0051] The plug projection purposefully has at least two plug segments, preferably three or four, which are movable relative to each other in the direction transverse to the plug axis. When the plug projection is inserted into the plug housing, the plug segments are movable toward and / or away from each other. For example, the plug segments are initially movable toward each other in the plug axis direction during insertion until there is free space from which the plug segments can move away from each other again. The aforementioned rear gripping surfaces are provided, for example, in the free space. The plug segments are formed, for example, such that the plug projection has grooves extending in the direction of the plug axis, which penetrate the plane in which the plug axis is located.

[0052] The sealing element preferably has at least one support contour, such as a support sac and / or a support rib projecting in front of the sealing element, which is intended and configured to contact laterally with a rib defining the cavity. The support contour may also be, for example, a welded projection, or may be formed thereby. In the end, the sealing element and the flat body are supported by each other in a force direction parallel to the machined surface. In principle, however, the flat body may also have a support contour, particularly a support rib, which is intended and configured for engagement with, for example, a support sac, groove, etc., in the sealing element, so as to engage with the opposite support contour of the sealing element.

[0053] The sealing element has two spaced-apart support contours, for example, two spaced-apart support ribs or inner surfaces of a positive engagement housing, particularly a housing groove, which are intended to contact opposing ribs defining a cavity or define a housing that engages with ribs, for example in the form of a housing groove. Thus, the sealing element and the flat body are supported by each other in opposite force directions parallel to the machined surface.

[0054] The at least one support contour is more preferably comprised of at least two support contours, such as support ribs, that extend inclined toward each other for support to ribs inclined toward each other. In the end, the sealing element and the flat body are supported by forces inclined toward each other parallel to the machined surface.

[0055] In an advantageous embodiment, the at least one support contour is intended to include a support frame for lateral contact with the inner circumference of a cavity defined by a plurality of ribs, e.g., 3, 4, or 5 ribs. The ribs and legs of the support frame extend inclined toward each other, and are shaped, for example, triangular, square, or trapezoidal.

[0056] The at least one support contour may preferably form or include a weld projection for heat welding, for example, ultrasonic welding, to the seal element to the flat body. However, it is also possible that the at least one support contour is provided and constitutes a support contour that merely ensures, for example, a positive engagement retention of the seal element to the flat body and / or for adhesive bonding of the seal element and the flat body.

[0057] In principle, the sealing element on the machine side can cover all cavities located within the suction space. Cavities located outside the suction space may also be covered by the sealing element. Here, it is possible for all cavities located outside the suction space to be covered by the sealing element.

[0058] However, a certain design is preferable, namely, the polishing pad having a cover element on the machine side that covers at least a portion of the cavity. Thus, both the sealing element and the cover element can each cover the cavity on the machine side. A sandwich-type device is also possible, i.e., both the sealing element and the cover element are placed on top of each cavity. It is also possible for the sealing element to cover at least a portion of the cavity through the interposition of the cover element, and it can also cover without the cover element.

[0059] The cover element is preferably plate-shaped. The cover element is preferably configured as a ring body.

[0060] The sealing element and the cover element may be integrally or fixedly connected to each other. Furthermore, the sealing element may include or form the cover element.

[0061] The cover element is preferably fixed and held to the flat body. For example, the cover element is held to the flat body by positive engagement and / or by a sealing element and / or by adhesive bonding, particularly by removable adhesive bonding and / or welding. The sealing element can thus form a retaining element for the cover element, so to speak. It is also easily possible to hold the sealing element to the flat body by the cover element, for example, by positive engagement. For example, a portion of the sealing element can engage with the gap between the cover element and the flat body, and thus be held to the flat body by the cover element.

[0062] Advantageously, the cover element may have multiple openings that can be provided for a number of purposes, for example, for a positive engagement element, through which the seal element and the flat body are fixed to each other by positive engagement, for engagement with the retaining contour of the seal element, i.e., for retaining projections positioned on the seal element and engaging with these openings. However, the openings may also be provided for the passage of contaminated air or for a drive device holder. The openings may preferably be through openings. However, the openings may also be simply recesses or depressions, for example, for engagement with the retaining contour of the seal element. Through openings are not necessarily required at these locations.

[0063] The sealing element preferably has a plurality of retaining protrusions for holding the cover element to the flat body. The retaining protrusions preferably extend in a plane parallel to the machined surface. The retaining protrusions may include hook protrusions that engage with the cover element and engage with one of the aforementioned openings, which are configured, for example, as a through opening or recess. The retaining protrusions may or may include retaining protrusions that project radially outward, i.e., away from the drive holder, but preferably in the direction of the drive holder. In particular, it is advantageous for additional retaining protrusions to hold the cover element to the flat body in the direction of the drive holder, i.e., in the suction area. The retaining protrusions may extend to the drive holder.

[0064] The sealing element and / or cover element preferably completely or partially cover the cavity of the flat body in the suction zone area. It is advantageously intended that only the outlet opening for contaminated air in the suction zone and / or the drive unit holder are not covered by the sealing element and / or cover element.

[0065] For example, the seal element and cover element are eccentric and / or annular. Both the seal element and cover element may extend annularly around the drive holder. A circular ring is easily possible here.

[0066] If the polishing pad has a shape other than circular, such as triangular or square, it is advantageous for the sealing element and / or cover element to have a basic geometric contour similar to that of the flat body or polishing pad. The annular shape of the sealing element and cover element described above may be circular, but it may also be, for example, a triangular annular shape or a square annular shape.

[0067] The sealing element and / or cover element shall, for the purpose, have an outer periphery that correlates with the outer periphery of the flat body or polishing pad, such as a rounded or circular annular outer periphery, a triangular outer periphery, or a square outer periphery.

[0068] The cover element is preferably held to the flat body by a sealing element in a rotationally fixed manner (preventing rotation) with respect to a rotation axis around which the flat body rotates during sander operation. The positive engagement contours, which the sealing element and the flat body engage with each other, preferably engage positively with the positive engagement housing or positive engagement contour of the cover element.

[0069] A cover element that at least partially covers the sealing element and / or the cavity of the flat body, for example, the cover element described above, may be plate-shaped or wall-shaped.

[0070] The sealing element can have a higher mechanical load-bearing capacity and / or wall thickness than the cover element. For example, while the cover element is made of a thin film material or a material with a thin wall thickness, the sealing element, which is subjected to load at least by friction during operation by the opposite sealing element of the sander, has higher rigidity or strength than the cover element. For example, a step is provided between the sealing element and the cover element. For example, the step is formed such that the sealing element has a greater material thickness than the cover element.

[0071] Except for the outlet opening for contaminated air outside and / or inside the suction area, the cover element or cover element that at least partially covers the cavity of the sealing element and / or the flat body, for example both together, covers all the cavities of the flat body on the machine side, and they are closed between the machine side and the machining side. For example, further cavities may be provided radially on the outside or edge of the flat body, and they are not closed by the cover element or sealing element. For example, the ribs of a rib structure open toward or at the outer edge of the polishing pad, where they are not covered by the cover element or sealing element.

[0072] At least a portion of the ribs of the flat body extend radially or radially from the drive holder to the edge region of the polishing pad. Of course, transverse ribs and transverse reinforcements may be provided between these ribs.

[0073] Preferably, at least a portion of the ribs of the flat body define a common support plane or support surface in which the ribs support the sealing and / or cover elements. The support plane is, so to speak, an enveloping or common plane in which the ribs of the flat body form the support plane. The support plane can be a flat surface or a flat plane. It is advantageous that all ribs or cavities of the flat body in the region of the support plane are covered and / or closed by the sealing and / or cover elements.

[0074] The support wall may be substantially closed, but an inlet opening is provided therein. However, it is also possible that the support wall has a plurality of recesses and depressions on the processing side, thereby forming, for example, a kind of rib structure. The support wall of a flat body has a plurality of recesses on the processing side, for example, to form an inlet opening and / or to provide at least a partial section of a passage. The recesses extend radially, for example, from the outer circumference of the polishing pad toward the drive holder and / or toward an outlet opening adjacent to the drive holder.

[0075] The work surface of the abrasive pad may be directly provided by a support wall. For example, an adhesive layer for the abrasive means or the abrasive means itself may be located there. The abrasive means includes, for example, abrasive nits and / or abrasive material for abrasive grains, such as corundum. The abrasive means is preferably an abrasive sheet. The abrasive pad is advantageously suited for fixing the abrasive sheet to the work surface.

[0076] Furthermore, a cover body can be positioned on the support wall to cover the support wall and, in particular, to close multiple recesses in the flat body. The cover body may have multiple through-openings or passages, and may also have an opening for the inflow of the polishing pad.

[0077] The cover body includes or is formed by, for example, an elastic and / or resilient cushion body, such as a type of pad.

[0078] The cushion body is made of a plastic that is elastic and / or airtight and / or impermeable to dust particles. For example, the cushion body is made of foam. In a preferred embodiment, the cushion body includes or consists of polyurethane foam, particularly polyester-based elastic foam and / or aromatic PUR elastic foam. The cushion body is configured, for example, as a pad or cushion.

[0079] The cover body completely or substantially completely covers the flat body on the processing side. Preferably, the cover body covers the flat body on the processing side, except for edge regions away from the drive holder and provided to engage behind the polishing means, and / or except for inlet or through-holes for contaminated air. For example, there is no adhesive layer in the edge regions, so that the polishing means, e.g., the polishing sheet, can be removed from the polishing pad. Of course, inlet openings on the processing surface are fluid-connected and / or in communication with inlet or through-holes of the cover body.

[0080] The following embodiments of the cover body form an advantageous embodiment of the present invention, namely, it is suitable for an advantageous device for a flat body. However, the cover body can also be used for different polishing pads, for example, polishing pads without cavities and / or polishing pads not covered by sealing elements, cover elements, or both. In particular, such a polishing pad may have a flat body in which the cover body is arranged according to the following embodiments, but without any special measures taken. However, it is advantageous for such a flat body to have a plurality of inlet and outlet openings fluidly connected to each other by a plurality of passages, so that dirty air flowing into the processing side of the flat body passes through the passages to the outlet openings, where it can be sucked up by, for example, a suction device, a sander, etc.

[0081] Advantageously or as an independent invention, a cover body is provided for or as a component of the polishing pad. The polishing pad is configured in particular according to any one of the above claims, the cover body is configured as a cushion, and has a support wall body and a work wall body, between which a resilient and / or elastic cushion body is sandwiched. The support wall body and the work wall body have flat sides facing away from each other, of which the flat side of the support wall body is intended and configured to contact one flat body or flat body of the polishing pad, and the flat side of the work wall body includes polishing means or includes an adhesive layer for removably fixing the polishing means. The work wall body and the support wall body are connected to each other by a connecting device on the outer circumference of the cover body, so that the cushion body is protected from mechanical damage on the outer circumference of the cover body by the support wall body, the work wall body and the connecting device.

[0082] The basic concept is that the cover body is reinforced, so to speak, at its edges, or around its periphery, by the connecting device, or at least that it covers the cushion body. Therefore, the cushion body is confined on one side by the support wall body and the processed wall body on the opposite side of the cushion body, and on the periphery by the connecting device. Accordingly, the connecting device preferably forms a reinforcement portion of the cover body on its outer circumference.

[0083] In this regard, it should be noted that the outer circumference of the cover body preferably has essentially the same contour as the flat body or disc body of the polishing pad.

[0084] The support wall body and / or processed wall body are made of a different material from the cushion body and / or a material with higher tensile strength than the cushion body. Therefore, the cover body and processed wall body provide a protective cover for the cushion body, which has high tensile strength.

[0085] The cushion body is preferably made of foam, such as polyurethane foam. Therefore, the cushion body is elastically flexible.

[0086] Another possible embodiment is one in which there is no support wall body, that is, the cushion body is in direct contact with a flat body, for example, the support wall of the flat body, and the flat body is connected to the processed wall body by a connecting device.

[0087] The cushion body may consist of, for example, a single foam material or a combination of at least two foam materials or foam materials.

[0088] The support wall body and / or processed wall body are preferably made of a textile material. In particular, the support wall body and / or processed wall body have a tighter mesh or a looser mesh than the cushion body. Compared to the cushion body, the support wall body and processed wall body are thinner; that is, for example, the cushion body is at least twice as thick, preferably three times as thick, as the support wall body and processed wall body.

[0089] The woven material of the support wall body and / or the processed wall body is preferably reinforced with, for example, polyamide fibers.

[0090] The connecting device includes, for example, a seam or a plurality of spaced-apart connecting bodies, such as rivets, or is formed by seams or rivets. The seams or connecting bodies are, for example, angled apart from each other. The seams or connecting bodies connect the support wall body and the processed wall body to each other, for example, directly. However, it is also possible that at least one section of the cushion body is passed through the connecting device, such as a seam or connecting body, between the support wall body and the processed wall body, so to speak. It is preferable that the cover body is edged with a seam on its outer circumference. However, it is also possible that the seam is sewn through the front or flat side of the support wall body and the processed wall body, respectively.

[0091] Material-bonded connections are further possible. In this case, the connecting device includes material bonding, or is formed by material bonding, such as welding and / or adhesive bonding. The material bonding connects the support wall body and the processed wall body to each other, for example, directly. In this case, for example, a part of the intermediate layer or cushion body may be adhesively bonded or welded between the support wall body and the processed wall body, and welding makes the material of the cushion body, so to speak, rigider and more elastic on its outer circumference. Instead of or in addition to adhesive bonding, for example, ultrasonic welding may be used. Furthermore, the connecting device may be formed of vulcanized material on the support wall body and the processed wall body, which simultaneously creates a material bond between the two wall bodies.

[0092] A ring body that at least partially surrounds the outer circumference of the cover body is advantageous as a connecting device. For example, the ring body surrounds the cover body like a fastener (fastener, metal fitting).

[0093] The ring body includes, for example, at least one peripheral wall or peripheral wall section that covers the cushion body on the outer circumference of the cover body. It is even more advantageous for the ring body if it has one or more leg portions, for example two, which support the respective flat sides of the support wall body, the flat sides of the work wall body, or the flat body of the polishing pad. For example, the support wall body, the work wall body, and the flat body may be supported between opposing legs or between the legs of the ring body. Thus, the ring body may also hold the flat body.

[0094] The ring body has, for example, a clamping opening or groove that can be fixed to the cover body. The longitudinal ends of the ring body, between which the clamping opening or groove is provided, may be movable toward each other in the sense of enclosing the cover body. However, it is also possible for several ring segments to be joined together to form a ring body, or for the ring body to include a number of ring segments. It is preferable that the ring body completely or essentially surrounds the outer circumference of the cover body, so that it is protected as completely as possible from the outside by the ring body.

[0095] The ring body clamps the processed wall body to the support wall body and / or flat body. For example, the ring body may be configured as a bent component.

[0096] The ring body may also include multiple ring bodies located on opposite sides of each other, connected in particular by rivets, bolts or other similar connecting bodies, with the machined wall body and the support wall body sandwiched between these ring bodies. Furthermore, sections of a flat body, such as the outer edge portion of a flat body, can also be engaged between these ring bodies.

[0097] However, the at least one ring body may further have or be formed by having a ring body positioned between the processed wall body and the support wall body, or a section positioned between the processed wall body and the support wall body. For example, the ring body may surround the cushion body radially outward or on the outer circumference of the cover body.

[0098] Above: The support wall body and / or processed wall body are advantageously made of a material that is more impact-resistant and / or denser and / or harder than the cushion body.

[0099] The ring body sandwiched between the support wall body and the processed wall body is preferably made of a ring body having higher tensile strength and / or greater impact resistance and / or higher density than the cushion body. Furthermore, this ring body may be made of, for example, a foamed material, a porous material, or a flexible material. However, this material is preferably less porous, stronger, or harder than the cushion body, or all of the above.

[0100] The ring body may be elastic and may be deformable by forces acting on the processed wall body in the direction of the support wall body. For example, the ring body is made of rubber or elastic plastic at least partially. The ring body may be manufactured by vulcanization, for example, or connected to the cover body, for example, the support wall body and / or the processed wall body, by vulcanization. Therefore, the ring body preferably forms a wall body that covers the cushion body radially outward or around the outer circumference of the cover body.

[0101] The cover body, for practical purposes, has a large central area where the cushion body is positioned, with connecting devices extending around it. In the central area, there are no connecting parts that penetrate the cushion body between the processing wall body and the support wall body. The advantage here is that in the central area, the cushion body has extreme elasticity, that is, it allows the polishing means positioned there to make flat contact with, for example, the workpiece to be processed.

[0102] Furthermore, it is advantageous for the processed wall body to have a large central area that protrudes further in front of the support wall body and / or further in front of the flat body than it does on the outer periphery of the cover body. There, for example, a setback is implemented by a connecting device. However, this setback is advantageously continuous rather than stepped. Therefore, the cover body preferably has a convex or cushion-like shape in the area of ​​the processed wall body.

[0103] Multiple outlets for contaminated air are purposefully located on the flat sides of the work wall body, and they are connected to multiple outlets on the flat sides of the support wall body via multiple passages. The contaminated air can flow through the passages into the cover body. The outlets of the cover body, when provided on the flat body of the polishing pad, communicate with inlet openings on the flat body, and these are fluidly connected to the machine-side outlets of the polishing pad via passages.

[0104] The cushion body can extend completely around the outer circumference of the cover body and / or to the connecting device. However, it is also possible for a cavity, so to speak, air, surrounded by, for example, the support wall body and the processed wall body, to be placed between the cushion body and the outer circumference of the cover body. This cavity is preferably configured as an annular space.

[0105] A cover body with an edge-side connecting device offers special advantages, particularly in relation to eccentric grinding machines, i.e., when the grinding pad performs eccentric or at least non-rotational motion. Thus, when the edge area of ​​the grinding pad strikes a workpiece or obstacle, the connecting device protects the cushion body from damage.

[0106] In this regard, it should be noted that the polishing means is preferably a polishing sheet that is removable from the polishing pad and can be removablely held therein.

[0107] The adhesive layer includes components of a hook-and-loop connection, such as a hook-and-loop layer and hook-and-loop hooks, for example, for the removable fastening of the polishing means.

[0108] The polishing means may be placed directly on the cover body, for example, on the polishing mat. However, the cover body may also have or support an adhesive layer, for example, a hook-and-loop layer, for the removable attachment of the polishing means to the polishing pad.

[0109] The present invention further relates to a sander having a polishing pad according to the present invention and an opposing sealing element for contacting a sealing element of the polishing pad. The opposing sealing element has, for example, an elastic ring body made of an elastic material. However, the opposing sealing element may also simply be a plate-like body that slides along the sealing element. In particular, it is advantageous that the opposing sealing element is held in the housing of the sander so as to be elastically flexible with respect to the sealing element.

[0110] The sander may have, for example, a drive motor that drives a tool holder, to which a drive holder for the polishing pad may be detachably fixed. The drive motor may be an electric motor, such as an electronically rectified or brushless motor, a universal motor, etc. However, the drive motor may also be a compressed air motor. Eccentric bearings and / or gears for eccentrically mounting the tool holder with respect to the rotation axis of the drive motor may be placed between the tool holder and the drive motor.

[0111] Purposefully, the elastic ring body of the opposing seal element has one or more contact bodies embedded in it to make polishing contact with the sealing element of the polishing pad, and at least one of the contact bodies is made of a material harder than the elastic material, such as metal. Therefore, the opposing seal element is wear-resistant.

[0112] Retaining pins, particularly multiple retaining pins spaced at an angle, are intended to protrude from the sealing element and engage with the pin housing of the flat body.

[0113] The appropriate geometric structure of the cover and / or sealing elements makes it easy to individually configure the suction concept of the polishing pad. Over time, the cavity of the polishing pad can fill with dust and other substances, which can negatively affect the operating behavior, smooth operation, and balance of the polishing pad.

[0114] The suction behavior and the suction behavior of contaminated air can be regulated by different configurations of the sealing element, such as geometric configurations and / or different materials.

[0115] Existing plate bodies or polishing pads can have sealing elements fitted onto them. Variations of polishing pads can be easily made by using different sealing elements.

[0116] The sealing elements can be easily replaced when they wear out.

[0117] The material of the sealing element can be easily adapted to the properties of the opposing sealing element, such as its contact force and frictional force, thus allowing for the selection of suitable material combinations for the sealing element and the opposing sealing element.

[0118] Exemplary embodiments of the present invention are described below with reference to the drawings. [Brief explanation of the drawing]

[0119] [Figure 1] This is a perspective view of a sander in a partial cross-section with the polishing pad shown in the illustration. [Figure 2] These are exploded views and detailed enlarged views D2, D3, and D4, seen from above at an angle. [Figure 3] This is an assembly diagram viewed from above at an angle. [Figure 4] These figures, D5 and D6, are exploded views of the polishing pad and detailed enlarged views, respectively, which are similar to Figure 2, but are viewed from below at an angle. [Figure 5] This figure shows a polishing pad according to the previous drawing, viewed from below at an angle. [Figure 6] This is a plan view of the polishing pad from the previous drawing, seen from above and in front. [Figure 7] This is a partial cross-sectional view corresponding to detail D1. [Figure 8] This follows detail D1, but is a partial cross-sectional view along the cutting line BB in Figure 6 of detail D1. [Figure 9] In another embodiment, this is an exploded view of a sander in a partial cross-section according to Figure 1, which has a polishing pad. [Figure 10] This is a diagram of the polishing pad according to Figure 9, viewed from above at an angle. [Figure 11] This is an exploded view of the polishing pad according to Figure 10, viewed from above at an angle. [Figure 12] This is an exploded view of the polishing pad, as shown in Figures 10 and 11, viewed from below at an angle. [Figure 13] This figure shows alternative sealing elements for polishing pads according to Figures 9-12. [Figure 14]This is a cross-sectional view along the cutting line CC passing through the polishing pad as shown in Figure 10. [Figure 15] This is a cross-sectional view along the cutting line DD passing through the polishing pad as shown in Figure 10. [Figure 16] This figure shows a modified example of a polishing pad having a cover element with an edge reinforced by a reinforcing device, following the previous drawings, in the first embodiment. [Figure 17] This figure shows the polishing pad and especially the cover body, as seen from below at an angle in Figure 16. [Figure 18] This figure shows a detailed view of D7 from Figure 17. [Figure 19] This figure shows a modified example of a polishing pad according to Figure 16, having a smaller cushion body that closely matches detail D8 in Figure 16. [Figure 20] This figure shows a further modified cover body, a modified polishing pad, and a cover body having a ring body as a connecting device. [Figure 21] This is a cross-sectional view through the polishing pad according to Figure 20, which closely corresponds to detail D8 in Figure 16. [Figure 22] This figure, which follows Figure 20 as viewed from above at an angle, shows a polishing pad with an alternative ring body. [Figure 23] This is a partial cross-sectional view through the edge region of the polishing pad, following Figure 22, which closely matches detail D8. [Figure 24] This figure shows a further cover body and a further polishing pad, with adhesive or welding on the edge side of the cover body. [Figure 25] This figure shows the details of the polishing pad and cover body, following Figure 24, which closely matches detail D8. [Figure 26] This figure shows the ring body and a further polishing pad and cover body, which have molded and bent portions that serve as connecting devices. [Figure 27] This figure shows a detailed cross-section that closely matches detail D8. [Figure 28] This diagram shows the polishing pad and cover body viewed from below at an angle. [Figure 29]This figure shows a detailed cross-section, for example, detail D8. [Figure 30] This figure shows a detailed view of the additional polishing pad and cover body, which have an elastic edge protection section, as seen from below at an oblique angle. [Figure 31] This is a cross-sectional view (which closely matches detail D8). [Modes for carrying out the invention]

[0120] The sander 15 is used to sand the surface of a workpiece, such as the wall surface of a space or a portable workpiece W. The sander 15 can be held by a handle 16 which can be fixedly connected to the machine housing 20 of the sander 15 by a joint 17, as shown in the drawing, or movable. The handle 16 may be an integral part of the machine housing 20 and may protrude fixedly from it, as shown in the drawing. In particular, a rod-shaped handle 16 allows the sander 15 to be guided along a distant workpiece surface, for example, along the ceiling or side wall of a room.

[0121] A drive motor 25 is housed in a motor section 21 of the machine housing 20, which is, for example, an electronically commutator motor, a universal motor, etc. The output section 26 of the drive motor 25 drives an eccentric bearing device 27 that rotatably supports the tool shaft 28, i.e., by one or more pivot bearings. The bearing device 27 has a tool holder 29, to which a grinding pad 40 can be removably fixed using its drive device holder 49. The drive device holder 49 and the tool holder 29 have, for example, corresponding screw contours, bayonet contours, or other means of fixing for removable fastening. The tool shaft 28 is eccentric with respect to the axis of the drive motor 25 (not shown in detail in the drawings) where the output section 26 is located, i.e., the rotation axis E of the tool holder 29 is eccentric with respect to the rotation axis M of the drive motor 25. Therefore, a rotational but eccentric grinding or driving motion can be generated by the drive transmission device of the sander 15. Of course, this eccentricity is only in one embodiment; for example, if the tool holder 29 is directly positioned on the output section 26 of the drive motor 25, the sander 15 can, in principle, drive the polishing pad 50 without such eccentricity.

[0122] The polishing pad 40 is housed within a protective body 23, which is designed, for example, in the form of a suction hood or a protective hood. The protective body 23 is held by or integrated with the tool portion 22 of the motor housing 20, which is located on the motor portion 21.

[0123] The workpiece surface 45 of the polishing pad 40 protrudes in front of the protective body 23, that is, in front of its edge 24 which is directed toward or protruding toward the workpiece surface 45.

[0124] A suction device 30 is used to suck up dust and debris generated during the use of the sander 15 or polishing pad 40, i.e., to remove particles from the workpiece W. For example, the suction device 30 is located on the tool portion 22. The suction device 30 has a suction fitting 31 to which a suction device 11, for example, a vacuum cleaner hose 12, can be connected. The suction device 11 generates a suction flow so that dirty air S can be discharged from the area of ​​the workpiece surface 45. Of course, the suction device or flow generator may be mounted directly on the sander 15, in particular on a fan wheel or the like. This can be driven by a drive motor 25 or a separate drive motor.

[0125] The suction attachment 31 is fluidly connected to a suction chamber 32 that extends around the tool holder 29. When the machine side 41 of the polishing pad 40 is subjected to negative pressure or suction, the outlet opening 43 for the dirty air S present therein in the suction chamber 32 is subjected to negative pressure.

[0126] Ambient air L flows further from the outside around the polishing pad 40, for example, through the gap 34 between the protective body 23, the suction hood and the polishing pad 40 and / or through the pass-through opening 33 of the protective body 23.

[0127] The flow-through opening 33 is provided in the edge region 47 of the polishing pad 40. The suction region 44 in the center of the polishing pad 40, i.e., the suction region extending around the drive unit holder 49, is also defined by a sealing device 35 that surrounds or encloses the suction chamber 32.

[0128] The sealing device 35 includes an opposing sealing element 36 of the sander 15, which, when the sanding pad 40 is placed on the sander 15, contacts the sealing element 80 of the sanding pad 40 to form a seal. The opposing sealing element 36 includes, for example, an elastic ring body 37, in particular a type of sealing collar. The ring body is made of, for example, elastic plastic, rubber, etc. The opposing sealing element 36 has a movable contour, beads, etc., so that it is deformable relative to the substantially rigid or inelastic sealing element 80.

[0129] To reduce wear on the opposing sealing element 36, multiple contact bodies 38 are embedded within the ring body 37 and slide along the sealing element 80 of the polishing pad 40. The contact bodies 38 are made of a harder material than the ring body 37 and include, for example, multiple metal pins.

[0130] The machining surface 45 of the polishing pad 40 is located on its machining side 42. An inlet opening 48 for the inflow of contaminated air S is also located there. The inlet opening 48 communicates with a passage 59 of the polishing pad 40, and the passage 59 is fluidly connected to an outlet opening 43.

[0131] The sealing element 80 extends around the suction region 44 on the machine side 41. The outflow opening 43, which opens into the suction chamber 32, is located, so to speak, inside the suction region 44. The sealing element 80 thus encircles the suction region 44 in an annular manner. The outer region 46 is located radially outward with respect to the drive holder 49, i.e., between the edge region 47 or the outer circumference of the polishing pad 40 and the sealing element 80, i.e., closed toward the machine side 41 by the cover element 70. Only radially outward with respect to the drive holder 49, i.e., in the edge region 47, the rib structure 45 of the polishing pad 40 is open toward the outer edge of the polishing pad 40 and not toward the side 41, so as to prevent any dust deposits from forming there.

[0132] The polishing pad 40 essentially obtains its rigidity and hardness from the rigid flat body 50. For example, the flat body 50 is made of metal, thermoplastic plastic, etc. In addition, the flat body 50 is reinforced by a rib structure 45.

[0133] The flat body 50 has multiple cavities 57 on its machine side 51, located between multiple ribs 56 of the rib structure 55. The cavities 57 are essentially created for demolding of the flat body 50 in relation to the casting process, for example, when the casting core GK ( schematically shown in Figure 3) is removed from each cavity 57. Thus, the intermediate spaces between the ribs 56, and therefore the cavities 57, are open, while the portion of the support wall 54 extends between the ribs 56 on the machine side 52 of the flat body 50.

[0134] However, in this regard, it should be noted that the support wall 54 includes a plurality of recesses 59A, which communicate with or form inlet openings of the polishing pad 40. For example, a portion of the recess 59A may be represented by an inlet opening 58. The passage 59 communicates with a plurality of outlet openings 53 on the machine side of the flat body 50, so that contaminated air flowing into the recesses 59A or inlet openings 58 can flow through the passage 59 to the outlet openings 53.

[0135] As long as the flat body 50 is open on its machined side 52 due to the recess 59A, it will be closed or covered by the cover body 560 anyway.

[0136] The cover body 560 is positioned on the processing side 52 of the flat body 50 by its machine side 61 and is connected to the flat body 50 by means of adhesive bonding, for example, or by a positive-acting engagement (not shown).

[0137] The cover body 560 has a plate-like shape. The cover body 560 has, for example, a plurality of through-openings 63 that are fluid-connected to or in communication with the inlet opening 58 of the flat body 50. Furthermore, a through-opening 569 is provided in the cover body 560 in the area of ​​the drive device holder 49, thereby allowing, for example, a tightening screw to be operated, and the polishing pad 40 can be connected to the tool holder 29 using this.

[0138] On the processing side 62, the cover body 560 preferably has an adhesive layer 66 for the polishing means 90, and especially for the polishing sheet 90A, such as a hook-and-loop layer or adhesive layer. Of course, instead of the adhesive layer 66, polishing means such as sand grains or polishing material can be directly placed.

[0139] The flat body 50 is basically covered on the machine side 51 by a cover element 70.

[0140] The cover element 70 extends into the outer region 46, where it covers the rib structure 55 toward the machine side. Thus, dust and other unwanted materials cannot enter the cavity 57 of the outer region 46. The cover element 70 also essentially covers the cavity 57 of the rib structure 55 radially inward relative to the seal element 80.

[0141] The machined side 72 of the cover element 70 rests on the rib 56 and can be, for example, bonded to the rib and / or welded to the rib, for example, by heat welding.

[0142] In the exemplary embodiment, the cover element 70 is held to the flat body 50 by a positive engagement, i.e., by a sealing element 80. Thus, for example, the multiple through-openings 73 of the cover element 70 are aligned with the outflow openings 53 of the flat body 50, thereby indicating the outflow openings 43 of the polishing pad 40. This is because the cover element 70 is provided not only in the outer region 46 to cover a portion of the cavity 57, but also in the suction region 44, where the cover element 70 covers all of the cavity 57 of the rib structure 55 except for the outflow openings 53 and the drive holder 49, where the through-openings 73 or through-openings 79 are provided, respectively.

[0143] The cover element 70 further has through openings 78, which are for retaining projections 89 and thus retaining contours 88 that engage with the housing or through openings 78 by positive engagement. For example, the retaining projections 85 are polygonal, or provided in several other ways with an anti-twist contour around their outer circumference, i.e., around their respective insertion axis, along which they can be inserted into the retaining housing 78.

[0144] The sealing element 80 has a sealing body 83A having a through opening 83 and therefore a ring shape. The inner circumferential contour of the sealing body 83A defining the through opening 83 defines the suction region 44. The sealing body 83A, which is wall-shaped or plate-shaped, has, for example, a sealing surface 83B provided on the machine side 81 of the sealing element 80, to which the opposing sealing element 36 abuts, i.e., can rub against to form a seal.

[0145] The retaining projection 89 penetrates the retaining housing 78 or through opening of the retaining element 70 and protrudes freely into the cavity 57. Of course, multiple insert housings and other similar positive-engagement retaining contours may also be provided for the retaining projection 89, so that the seal element 80 can be directly fixed to the flat body 50 in a positive-engagement manner by the retaining projection 89. Such positive-engagement support allows for support against a force direction F extending parallel to the machined surface 45, for example. Thus, the torque generated by the seal elements 36 and 80 rubbing against each other is supported by the flat body 50.

[0146] The sealing element 80 is connected to the flat body 50 by a positive engagement, i.e., latched, using a latching mechanism 84. The latching mechanism 84 includes a positive engagement projection 85 that projects toward the machined side 82 of the sealing element 80 and engages by positive engagement with a positive engagement housing 95 of the flat body 50. The positive engagement projection 85 and the positive engagement housing 95 are, for example, a plug-in projection and a plug-in housing.

[0147] The positive engagement projections 85 may engage with the positive engagement housing 95 by, for example, press-fitting, which occurs when the positive engagement projections 85 have grooves 85C, 85D, thereby forming insert segments 85A, 85B that are relatively movable toward and away from each other across the insertion shaft SA. In particular, such press-fitting is brought to the lateral support surface 98 of the positive engagement housing 95, which is used to support each positive engagement projection 85 for supporting a force F within the positive engagement housing 95. The support surface 98 supports, for example, the base region of each positive engagement projection 85, which is used to connect it to the seal body 83A.

[0148] The positive engagement projection 85 is configured, for example, as a retaining pin that engages with the retaining housing or the positive engagement housing 95.

[0149] Multiple rear gripping surfaces 97 are provided in the opposite direction to the insertion axis as the positive engagement projection 85 is inserted into the positive engagement housing 95. The rear gripping surfaces 97 are located in the extended section 96 of each positive engagement housing 95, where the head region 86 of each positive engagement projection 86 engages. The head region 86 also has multiple rear gripping surfaces 87 projecting transversely from the insertion axis SA in front of the base region or base section of each positive engagement projection 85. The positive engagement projection 85 is therefore supported by positive engagement in the positive engagement housing 95 in the direction of removal of the seal element 80 from the flat body 50. When the positive engagement projection 85 is inserted into the positive engagement housing 95, the insertion segments 85A and 85B move toward each other in the direction of the grooves 85C and 85D or in the direction of the narrower portions of the grooves 85C and 85D, so that the head region 86 passes through the support surface 98 and reaches the wider portion 96 of the positive engagement housing 95, where it can latch into the positive engagement housing 95.

[0150] Grooves 85C and 85D extend, for example, in a cross shape and / or at an angle to each other.

[0151] In addition to or instead of the latching means 84, adhesive bonding of the sealing element 80 to the flat body 50 may also be intended.

[0152] Alternatively, for example, a positive engagement projection may protrude from the flat body and engage with the positive engagement housing of the seal element. Therefore, for example, multiple projections may be provided on the flat body 50 to engage with the positive engagement housing of the seal element 80, which is provided in place of the positive engagement projection 85.

[0153] The positive engagement projections 85 are positioned on the seal element 80 at angular intervals, preferably equal or equidistant angular intervals, and protrude toward the machined side 82 of the element. The positive engagement projections 85 enter into the through opening 75 of the cover element 70, so that it is sandwiched between the seal element 80 and the flat body 50.

[0154] The multiple retaining contours 88 or retaining projections 89 form multiple additional retaining elements that secure the cover element 70 to the flat body 50. The retaining projections 89 are arranged, for example, at similar angular intervals from one another, and particularly at regular angular intervals from one another. It may be intended that the retaining projections 89 be provided only on or next to all, preferably every other, positive engagement projections 85.

[0155] Instead of the cover body 560 on which the abrasive means in the form of an abrasive sheet 90A may be directly placed, a cover body 60 may also be provided.

[0156] The cover body 60 is fixed to the flat body 50 by the machine side 61, for example, by adhesive bonding or by being removably connected thereto, which will become clearer below. For example, the support wall body 64 of the cover body 60 abuts against the flat body 50.

[0157] On the machining side 62 opposite the machine side 61, the cover body 60 has a machining wall body 65 used to fix and support the polishing means 90, particularly the polishing means 90A. For example, an adhesive layer 66 is located on the machining wall body 65, which can be connected to the adhesive layer 94 of the polishing means 90, for example, by a hook-and-loop connection.

[0158] A cushion body 67 made of foamed material or other elastic material is positioned 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 be deformed in the direction of the processing side 52 of the flat body 50 by the deformation of the cushion body 67, and conform to the contour of the workpiece W.

[0159] The support wall body 64 and the processing wall body 65 have flat sides 64F and 65F that are separated from each other (facing away from one another), of which the flat side 64F of the support wall body 64 is intended and configured to contact the flat body 50 of the polishing pads 60 and 160, and the flat side 65F of the processing wall body 65 has an adhesive layer 66.

[0160] The cover body 60 has a plurality of through-openings 63, which align with the inlet opening 58 when the cover body 60 is installed on the flat body 50, so that the dirty air S that flows into the cover body 60 through the through-openings 93 of the polishing means 90 flows into the inlet opening 63E of the cover body 60, flows out through the through-openings 63, flows out from the outlet opening 63A of the cover body 60, and can flow further through the flat body 50.

[0161] Instead of the adhesive layer 66, abrasive means, such as abrasive material or sand particles, can be easily placed directly on the cover body 60 or 560.

[0162] For example, the cover body 60 is bonded to the flat body 50 by adhesive.

[0163] On the other hand, the cover body 60 is advantageously releasably fixed to the flat body 150 of the polishing pad 140 by a screw 68B inserted into the cover body 160, for example, through a through opening 68, and screwed into a screw housing 68D of the flat body 150 located on its machining side 52. The screw 68B has a plurality of screw heads 68C supported on the machining side 62 of the cover body 60, which is configured as a flat side. Although not shown in the drawings, as shown by dashed lines in Figure 14, the screw heads 68C protrude into the machining side 52 or the machining wall body 65, because a plurality of troughs are formed therein to accommodate the screw heads 68C, and a substantially flat surface 62B is created on the machining side 62. To form such troughs, the grooves 68A extend from the through opening 68, for example, in a star shape, and they enable or facilitate deformation of the cover body 60 or trough formation in the area of ​​the screw heads 68C.

[0164] The polishing pad 160 has the flat body 150 described above, which has a machine side 51 on which the drive device holder 149 is installed. The drive device holder 149 is used to fix a tool holder 129 which has an eccentric bearing device 27, although it differs in some respects from the tool holder 59. A plurality of retaining protrusions 29A are provided on its outer circumference where the screw housing portion 29B is located. The retaining protrusions 29A are preferably housed in the drive device holder 149 by positive engagement, for example, by a matching housing contour. However, this is not absolutely necessary, because a plurality of screws 29C are provided that enter into the through opening 29D of the flat body 150 and are screwed into the screw housing portion 29B.

[0165] The flat body 150 is constructed similarly to the flat body 50, namely having a support wall 54 and an inlet opening 58 on its machining side, which are fluidly connected via a passage 59 to an outlet opening 53 on the machine side 51 of the flat body 150. A rib structure 155 reinforces and supports the support wall 54 and opens toward the machine side 51, namely having multiple cavities 57 between multiple ribs 156 of the rib structure 155. These cavities 57 are also covered by the machine side 51 in the case of the flat body 150 and therefore the polishing pad 140, so that dust and other undesirable substances do not enter the cavities 57.

[0166] The polishing pad 160 has a sealing element 180 which is integrally surrounded by a cover element 170. The machine side 81 of the sealing element 80 is used to ensure that the elastic ring body 37 and / or the opposing sealing element 36 abut against it to form a seal. The annular sealing surface 83B is positioned on the sealing body 83A of the sealing element 180 for sealing contact of the opposing sealing element 36 and extends around the through opening 83 of the sealing element 180. The cover element 170 is positioned radially outward of the sealing element 180 and annularly surrounds the sealing element 180 with an annular ring body 174.

[0167] The sealing element 180 is connected to the flat body 150 by welding and essentially covers its cavity 57, except for a rib structure that opens radially outward relative to the polishing pad 140.

[0168] Both the sealing element 180 and the cover element 170 have a plate shape. The sealing element 180 protrudes in front of the cover element 170 in a direction away from the flat body 150. Multiple retaining contours 188 may be provided on the sealing element 180, which are retaining projections that engage with the flat body 150, for example, supported by ribs 156 of its rib structure 155.

[0169] Furthermore, multiple positive engagement contours are advantageously provided on the machine side 51 of the flat body 150 and the machined side 82 of the seal element 180, which advantageously and / or at least during the assembly process and / or during the welding process of the two components, holding the two components relative to each other, so that the welding described below is successful with optimal precision. For example, multiple positive engagement projections 158A are provided on the machine side 51 of the flat body 150 in the form of, for example, centering projections or centering pins that engage with the positive engagement housing 178 of the cover element 170. The pairs of positive engagement housing 170 and positive engagement projections 158A are provided at angular intervals with respect to the rotation axis or central axis of the polishing pad 140.

[0170] Multiple welded projections 185 are provided on the machined side 82 of the seal element 180 and the machined side 72 of the cover element 170, i.e., on the same side of both components, the projections are supported by ribs 156 and connected to them by ultrasonic welding. The welded projections 185 extend partially annularly around the outflow opening 53 of the flat body 50, thereby closing a passage 59 from which incoming contaminated air can flow through the inflow opening 58 to the machined side 52 of the flat body 50. The course of the welded projections 185 is adapted to the course of the ribs 156, and for example, has multiple portions 185A extending substantially parallel to the outer circumference of the drive unit holder 149, from which multiple portions 185B extend away toward the drive unit holder 149 and reach there.

[0171] The sealing element 180 thus covers or seals the radially inner region of the machine side 51 of the flat body 150 surrounding the drive unit holder 159, and is welded to this region. The cavity 57 is radially outer covered by a cover element 170, which rests firmly on the end faces of the ribs 156, but is not welded or not fully welded to those end faces. However, a plurality of welded protrusions 177, such as punctate welded protrusions, are provided on the machine side 72 of the cover element 170 radially outer with respect to the rotation axis of the polishing pad 140 and are welded to the material of the flat body 150. For example, the plurality of welded protrusions 177 are provided and arranged adjacent to each other at circumferential angular spacing with respect to the rotation axis of the polishing pad 140. The welded protrusions 177 are located in the radially outer edge region of the cover element 170 with respect to the rotation axis of the polishing pad 140.

[0172] Multiple weld protrusions 177, for example, four, form a group of weld protrusions. Preferably, there is an angular gap between the groups of weld protrusions 177 where no weld protrusions are provided. Preferably, the weld protrusions 177 form multiple rows.

[0173] In the example of a seal element 180A that, in principle, corresponds to a seal element 180 including a cover element 170 positioned therein, there are multiple weld projections that have a linear shape and also enable optimal welding to the flat body 150 in the area of ​​the cover element 170. For example, there are multiple periphery weld projections 185D extending around the outer circumference of the cover element 170. Multiple annular weld projections 185E also extend, for example, around the screw housing 86D. Furthermore, multiple additional weld projections 185C extend radially outward in a star shape in the area of ​​the cover element 170. Overall, the weld projections of the seal element 180 basically form a rib shape, which complements the rib structure 155 so to speak, and therefore rest on or adjacent to the end face of the rib 156. For example, the elongated weld projections and the numerous weld projections can be welded using ultrasound, as in the case of the seal element 180A, by a correspondingly powerful welding system of 20 kilowatts or more.

[0174] The cushion body 67 of the cover body 60 is exposed to the outer circumference 69 of the cover body 60. Consequently, for example, if the polishing pad 140 comes into contact with an obstacle, it will not be protected from damage.

[0175] To solve this problem, alternative cover bodies 60A, 60B, 60C, 60D, 60E, 60F, and 60G are provided on the cover body 60, and connecting devices 110A, 110B, 110C, 110D, 110E, 110F, and 110G are provided on their outer circumference 69. Connecting devices 110A-110G protect their respective outer circumferences 69 from damage, i.e., the cushion body 67 is protected by connecting devices 100A-110G. For simplicity, it will also be referred to as connecting device 100 below. The basic structure of the cover bodies 60A, 60B, 60C, 60D, 60E, 60F, and 60G is the same as that of the cover body 60, i.e., they have a support wall body 64 and a processed wall body 65, with the cushion body 67 sandwiched between them in each.

[0176] For example, a seam 101 is provided on the cover body 60A that directly connects the support wall body 64 and the processed wall body 65 to each other. The seam 101 is preferably configured as a zigzag seam. It is particularly advantageous if the seam 101 is configured as a kind of border.

[0177] The support wall body 64 and / or the processed wall body 65 are made of, for example, rubber, cloth (textile material), composite material, etc.

[0178] The support wall body 64 and the processed wall body 65 are, so to speak, connected to each other at their edges by a connecting device 100A. One advantageous effect is that the connecting device 100A, in particular the seam 101, forms a peripheral portion 69B on the outer circumference 69, in which or there the wall bodies 64 and 65 are positioned directly adjacent to each other and fixedly connected to each other. Starting from there, the inclined portion 69A of the outer circumference 69 extends to a flat or essentially flat fixed plane 69C provided for fixing the grinding means 90. The inclined portion 69A extends obliquely to the fixed plane 69C.

[0179] The fixed plane 69C is preferably a flat plane, and the head of the screw 68B does not protrude in front of it, that is, it is fitted into the groove or groove 68A of the cushion body 67.

[0180] In place of or in addition to the seam 101, material bonding 101A, such as welding or adhesive bonding, is also possible. In all these cases, the wall bodies 64 and 65 are directly connected to each other, so that the cushion body 67 is surrounded by the outer perimeter 69 and is not independent.

[0181] To better form the inclined portion 69A, for example, a cavity 67A is provided between the cushion body 67 and the outer circumference 69. This is the case, for example, in the case of the cover body 60A2.

[0182] Advantageously, the maximum surface extension of the fixed plane 69C and / or therefore the intermediate region or central region or central region 69Z or the processed side 62 of the cover body 60A is configured such that there are no connecting parts that enter the cushion body 67, the support wall body 64, and the processed wall body 65, such as parts of the connecting device 100, i.e., no seams or material joints. While this is possible in principle, under certain circumstances the fixed plane 69C may have grooves or other similar notches.

[0183] In the case of the connecting device 100B, a ring body 102 is provided that, so to speak, surrounds the support wall body 64, the processed wall body 65, and the support wall 54. The ring body 102 has, for example, a peripheral wall portion 102A, from which leg portions 102B and 102C are inclined and protrude, for example, at a right angle. A U-shaped housing is formed therein, where the peripheral portion 65A of the processed wall body 65 and the peripheral portion 64A of the support wall body 64 are housed.

[0184] The ring body 102 preferably has a groove or clamp opening 102D so that it can be attached like a clamp around the outer circumference of the polishing pad 140 surrounding the flat body 150 and the cover body 60B.

[0185] The connecting device 100C has a similar concept to the connecting device 100B, and unlike the ring body 102, the ring body 103 simply sandwiches the support wall body 64 and the processed wall body 65. The ring body 103A has a peripheral wall portion 103, from which the leg portions 103B and 103C protrude at an angle, forming a housing portion that accommodates the peripheral portions 65A of the support wall body 64 and the processed wall body 65.

[0186] Like the ring body 102, the ring body 103 also has a groove or clamp opening 103D, so that it can be positioned on the cover body 60C and surround it like a clamp. In this case, it engages, for example, with a recess or periphery housing 54A of the flat body 150C. The recess or periphery housing 54A is located on the outer circumference of its support wall 54 and / or opens radially outward. Otherwise, the flat body 150C coincides with the flat body 150.

[0187] However, the flat body 150C is also suitable for a connecting device 100D having, so to speak, a two-part ring body 104, which is configured, for example, as a stamped bent part. The ring elements 104A and 104B are, for example, welded to each other and / or bonded to each other in the region of the peripheral portion 104E of the ring element 104A. The peripheral wall portion 104C extends away from the peripheral portion 104E and away from the ring element 104B, while the leg portion 104B is located on the opposite side of the ring element 104B, so that between these two components there is a accommodating portion into which the peripheral wall portions 64A and 65A engage or are housed.

[0188] An alternative concept is implemented in the connecting device 100E, in which the ring body 105 has ring elements 105B and 105C, which sandwich the peripheral portions 64A and 65A and connect them to one another. The ring elements 105B and 105C are, for example, annular, especially circular, plate bodies or wall bodies, and these bodies face each other at their end faces or flat sides. The peripheral portion 65A of the processed wall body 65 and one peripheral portion 64A of the support wall body 64 are housed between the end faces or flat sides.

[0189] For example, ring elements 105B and 105C are connected to each other by a connecting body 105A, for example, by rivets, screws, etc. These connecting bodies penetrate both ring elements 105B and 105C, and the support wall body 64 and the processed wall body 65, thereby fixing all components to each other. As a result, the cover body 60E is made compact at its outer circumference 69, is rigid, and advantageously impact-resistant. However, it is also conceivable that ring elements 105B and / or ring elements 105C are not installed, in which case the connecting body 105A directly connects the surrounding portions 64A and 65A to each other. It is also intended that only one of ring elements 105B and / or ring element 105C may be present.

[0190] However, the relatively soft outer circumference of the cover element 60F provides optimal protection for the cushion body 67. For example, the ring body 106 of the connecting device 105 is made of an elastic material such as plastic or rubber. The ring body 106 has a circumferential wall 106A which preferably has wall components 106B that are movable relative to each other. For example, the wall components 106B are aligned in a V shape or positioned in a V shape relative to each other. The wall components 106C and 106D extend away from the circumferential wall 106A and are connected to the support wall body 64 and the processed wall body 65 by means of material bonding, adhesive bonding, etc.

[0191] Furthermore, portion 106E of the ring body 106 engages with the aforementioned housing portion 64A of the flat body 150. It is advantageous that the flat body 150 having the support wall body 64 protrudes substantially to the peripheral wall portions 106D and 106C, thereby allowing it to implement additional mechanical protection for the cushion body 67.

[0192] However, as in the case of the connecting device 100G, the material housed between the wall bodies 64 and 65 may represent the connecting device, being more wear-resistant than the cushion body 67 but still flexible. There, for example, the ring body 107 is formed from a foamed material that is more wear-resistant than the foamed material of the cushion body 67, for example, being harder and / or having more closed cells. The ring body 107 extends to the outer circumference 69, where it is open forward, i.e., not covered by, for example, the support wall body 64 or the processed wall body 65. However, since the ring body 107 is more mechanically elastic than the cushion body 67, it is less sensitive to impact loads than the cushion body 67. The thickness of the ring body 107 is advantageously selected to be smaller than the thickness of the cushion body 67, and its thickness represents the distance between the support wall body 64 and the processed wall body 65. Thus, from the central region or main surface region of the cover body 60G, the inclined portion 69A extends to the peripheral portion 69B located rearward relative to the central portion.

[0193] It can be seen that the support wall body 64 is not necessary in all cases. For example, in the exemplary embodiment of the cover body 60C, there is no support wall body 64, and the ring body 103 directly connects the processed wall body 65 to the support wall 54, so that the cushion body 67 is surrounded between the support wall 54 and the processed wall body 65. In this case, the ring body 103 provides sufficient protection to the outer circumference 69.

[0194] Such embodiments are also possible in other exemplary embodiments, namely, without a support wall body. For example, in an exemplary embodiment of the cover body 60A, the processed wall body 65 may be directly connected to the flat body 50, i.e., the support wall 54, by means of a seam, welding, etc., at the outer circumference 69. [Explanation of Symbols]

[0195] 15 Thunder 26 Drive unit 36 Opposite Seal Elements 40 polishing pads 41 Machine side 42 Processing side 43 Outlet opening 44 Suction area 45 Machining surface 48 Inflow opening 49 Drive unit holder 54 Supporting wall 56 Ribs 57 Cavity 59 aisle 66 Adhesive layer 80 seal elements 90 Polishing means S Polluted air W Workpiece

Claims

1. This is a sanding pad for a sander (15), The drive device holder (49) is located on the machine side (41) of the polishing pad, and is fixed to the drive device (26) of the sander (15) so as not to rotate, so that the polishing pad (40) can be driven by the sander (15) in a rotational polishing motion and / or eccentric polishing motion suitable for polishing a workpiece (W). The polishing pad (40) has a processing side (42) on the opposite side of the machine side (41), which has a processing surface (45) on which a polishing means (90) for abrasive processing of a workpiece (W) can be fixed using an adhesive layer (66) or is removable. Multiple inlet openings (48) for dusty, dirty air (S) to flow in are located on the processing surface (45), and multiple outlet openings (43) fluidly connected to the inlet openings via passages (59) are located on the machine side (41), The outflow opening (43) is located in the inner suction region (44) of the annular sealing element (80) located on the machine side (41) to seal and contact the opposite sealing element (36) of the sander (15), The polishing pad (40) has a flat body (50) having a support wall (54) provided to support the polishing means (90), the support wall being reinforced by a rib structure (55), the multiple ribs (56) protruding beyond the support wall (54) toward the machine side (41), The rib (56) defines a plurality of cavities (57) that are closed to the processing side (42) by the support wall (54) and open to the machine side (41), In a polishing pad, the sealing element (80) covers at least some of the cavities (57) toward the machine side (41), A polishing pad characterized in that the support wall (54) of the flat body (50) has a plurality of recesses (59A) on the processing side (42) to form the inlet opening (48) and / or to provide at least a partial section of the passage (59).

2. This is a sanding pad for a sander (15), The drive device holder (49) is located on the machine side (41) of the polishing pad, and is fixed to the drive device (26) of the sander (15) so as not to rotate, so that the polishing pad (40) can be driven by the sander (15) in a rotational polishing motion and / or eccentric polishing motion suitable for polishing a workpiece (W). The polishing pad (40) has a processing side (42) on the opposite side of the machine side (41), which has a processing surface (45) on which a polishing means (90) for abrasive processing of a workpiece (W) can be fixed using an adhesive layer (66) or is removable. Multiple inlet openings (48) for dusty, dirty air (S) to flow in are located on the processing surface (45), and multiple outlet openings (43) fluidly connected to the inlet openings via passages (59) are located on the machine side (41), The outflow opening (43) is located in the inner suction region (44) of the annular sealing element (80) located on the machine side (41) to seal and contact the opposite sealing element (36) of the sander (15), The polishing pad (40) has a flat body (50) having a support wall (54) provided to support the polishing means (90), the support wall being reinforced by a rib structure (55), the multiple ribs (56) protruding beyond the support wall (54) toward the machine side (41), The rib (56) defines a plurality of cavities (57) that are closed to the processing side (42) by the support wall (54) and open to the machine side (41), In a polishing pad, the sealing element (80) covers at least some of the cavities (57) toward the machine side (41), A polishing pad characterized in that a cover body (60, 60A-60G, 560) having the aforementioned processed surface (45) and particularly closing a plurality of recesses (59A) in the flat body (50) is arranged on the support wall (54).

3. This is a sanding pad for a sander (15), The drive device holder (49) is located on the machine side (41) of the polishing pad, and is fixed to the drive device (26) of the sander (15) so as not to rotate, so that the polishing pad (40) can be driven by the sander (15) in a rotational polishing motion and / or eccentric polishing motion suitable for polishing a workpiece (W). The polishing pad (40) has a processing side (42) on the opposite side of the machine side (41), which has a processing surface (45) on which a polishing means (90) for abrasive processing of a workpiece (W) can be fixed using an adhesive layer (66) or is removable. Multiple inlet openings (48) for dusty, dirty air (S) to flow in are located on the processing surface (45), and multiple outlet openings (43) fluidly connected to the inlet openings via passages (59) are located on the machine side (41), The outflow opening (43) is located in the inner suction region (44) of the annular sealing element (80) located on the machine side (41) to seal and contact the opposite sealing element (36) of the sander (15), The polishing pad (40) has a flat body (50) having a support wall (54) provided to support the polishing means (90), the support wall being reinforced by a rib structure (55), the multiple ribs (56) protruding beyond the support wall (54) toward the machine side (41), The rib (56) defines a plurality of cavities (57) that are closed to the processing side (42) by the support wall (54) and open to the machine side (41), The sealing element (80) covers at least some of the cavities (57) toward the machine side (41), In a polishing pad having a cover element (70) that covers at least a portion of the cavity (57) on the machine side (41), The present invention further comprises a cover body (60A-60G) for or as a component of the polishing pad (40), The cover body (60A-60G) is configured as a cushion and has a support wall body (64) and a processed wall body (65), with an elastic and / or resilient cushion body (67) sandwiched between them. The support wall body (64) and the work wall body (65) each have flat sides (64F, 65F) facing away from each other, wherein the flat side (64F) of the support wall body (64) is intended and configured to contact one of the flat bodies of the polishing pad or the flat body, and the flat side (65F) of the work wall body (65) includes a polishing means (90) or includes an adhesive layer (66) for removably fixing the polishing means (90). The polishing pad is characterized in that the processed wall body (65) and the support wall body (64) are connected to each other by a connecting device (100A-100G) at the outer circumference (69) of the cover body (60A-60G), and the cushion body (67) is protected from mechanical damage at the outer circumference (69) of the cover body (60A-60G) by the support wall body (64), the processed wall body (65), and the connecting device (100A-100G).

4. The polishing pad according to any one of claims 1 to 3, characterized in that the sealing element (80) and the flat body (50) are an integral part, or the sealing element (80) and the flat body (50) are separate components fixedly connected to each other.

5. The polishing pad according to any one of claims 1 to 4, characterized in that at least one cavity (57) covered by the sealing element (80) on the machine side (41) is a release cavity formed by removing the casting core (GK) from the cavity (57).

6. The polishing pad according to any one of claims 1 to 5, characterized in that the sealing element (80) covers and / or tightly closes all cavities (57) of the flat body (50) in the suction region (44) and / or on the flat side of the flat body (50) and / or between the drive holder (49) and the edge region (47) of the flat body (50), except for the outflow opening (43).

7. The polishing pad according to any one of claims 1 to 6, characterized in that the sealing element (80) tightly closes at least some of the cavities (57), preferably all of the cavities (57), except for the outflow opening (43), so that the volume inside each cavity (57) is sealed in a dustproof manner.

8. The polishing pad according to any one of claims 1 to 7, characterized in that the sealing element (80) covers and / or tightly closes at least one, multiple or all of the cavities (57) provided and configured to form one or more passages (59) and / or at least one or all of the passages (59).

9. The polishing pad according to any one of claims 1 to 8, characterized in that the sealing element (80) rests flat on the end face of the rib (56) facing the sealing element (80).

10. The polishing pad according to any one of claims 1 to 9, characterized in that the sealing element (80) is connected to the flat body (50), particularly the rib (56), by welding, particularly by ultrasonic welding, and / or by adhesive bonding.

11. The polishing pad according to any one of claims 1 to 10, characterized in that the sealing element (80) and / or the flat body (50) have at least one welding projection, in particular a welding tip, for welding to the respective other components of the sealing element (80) or the flat body (50), or are welded to the respective other components of the sealing element (80) or the flat body (50) by the at least one welding projection.

12. The polishing pad according to any one of claims 1 to 11, characterized in that the flat body (50) and the sealing element (80) are supported by a positive engagement in a force direction (F) parallel to the machined surface (45).

13. The polishing pad according to any one of claims 1 to 12, characterized in that the sealing element (80) is detachably disposed on the flat body (50) in particular by clamping means and / or latching means (84) and / or detachable adhesive bonding.

14. The polishing pad according to any one of claims 1 to 13, characterized in that the sealing element (80) and the flat body (50) are connected to each other by positive engagement by at least one pair of positive engagement projections (85) and positive engagement housings (95) that extend transversely, particularly perpendicularly, to the machined surface (45).

15. The polishing pad according to any one of claims 1 to 14, characterized in that the sealing element (80) has at least one support contour, particularly a support housing and / or a support rib projecting in front of the sealing element (80) to make lateral contact with a rib (56) defining the cavity (57).

16. The polishing pad according to claim 15, wherein the sealing element (80) has two spaced-apart support contours and / or welded protrusions, in particular a plurality of support ribs that are arranged to contact or engage with opposing ribs (56) that define a cavity (57) or define a receiving portion.

17. The polishing pad according to claim 15 or 16, wherein the at least one support contour or the at least one welded projection has at least two support contours or welded projections, particularly support ribs, that extend inclined toward each other for support to inclined ribs (56).

18. The polishing pad according to any one of claims 15 to 17, characterized in that the at least one support contour or the at least one welded projection includes a support frame for later contact with the inner circumference of a cavity (57) defined by a plurality of ribs (56) of the rib structure (55).

19. The polishing pad according to any one of claims 15 to 18, characterized in that the at least one support contour forms or includes a weld projection for heat welding and / or ultrasonic welding the sealing element (80) to the flat body (50).

20. The polishing pad according to claim 3, characterized in that the cover element (70) is held to the flat body (50) by positive engagement and / or by the seal element (80) and / or by adhesive bonding, and / or is integrally formed with or fixedly connected to the seal element (80), or is formed by the seal element (80).

21. The polishing pad according to claim 3 or 20, wherein the cover element (70) has a plurality of openings, particularly through openings (78) and / or through openings (73), for a positive engagement element to secure the seal element (80) and the flat body (50) to each other by positive engagement, and / or for engaging with a plurality of retaining contours (88) of the seal element (80), and / or for the passage of contaminated air (S), and / or for the drive device holder (49).

22. The polishing pad according to any one of claims 1 to 21, characterized in that, except for the outlet opening (43) for the contaminated air (S) outside and / or inside the suction area (44), the cover element (70) or cover element (70) which at least partially covers the cavity (57) of the seal element (80) and / or the flat body (50), covers all of the cavity (57) of the flat body (50) on the machine side (41), and they are closed with respect to the outer circumference (69) of the flat body (50) between the machine side (41) and the processing side (42) or up to the outer edge of the polishing pad (40).

23. The polishing pad according to any one of claims 1 to 22, characterized in that at least a portion of the ribs (56) of the flat body (50) extends radially or radially from the drive device holder (49) to the edge region (47) of the polishing pad (40).

24. The polishing pad according to claim 3, characterized in that at least a portion of the ribs (56) of the flat body (50) extends to a common support plane (SE) on which the ribs (56) support the sealing element (80) and / or the cover element (70).

25. The polishing pad according to claim 2, wherein the cover body (60, 60A-60G, 560) includes or is formed by an elastic and / or resilient cushion body (67), and / or the cover body (60, 60A-60G, 560) covers the flat body (50) on the processing side (42) completely or except for an edge region away from the drive holder (49) and intended to extend behind the polishing means (90), and / or the cover body (60, 60A-60G, 560) has the polishing means (90) or has the adhesive layer (66) to removably fix the polishing means (90) to the polishing pad (40).

26. The polishing pad according to claim 2 or 25, characterized in that the cover body (60, 60A-60G, 560) is detachably fixed to the flat body (50) by bolts, particularly threaded bolts.

27. The present invention further comprises a cover body (60A-60G) for or as a component of the polishing pad (40), The cover body (60A-60G) is configured as a cushion and has a support wall body (64) and a processed wall body (65), with an elastic and / or resilient cushion body (67) sandwiched between them. The support wall body (64) and the work wall body (65) each have flat sides (64F, 65F) facing away from each other, wherein the flat side (64F) of the support wall body (64) is intended and configured to contact one of the flat bodies of the polishing pad or the flat body, and the flat side (65F) of the work wall body (65) includes a polishing means (90) or includes an adhesive layer (66) for removably fixing the polishing means (90). The polishing pad according to claim 1, characterized in that the processed wall body (65) and the support wall body (64) are connected to each other by a connecting device (100A-100G) at the outer circumference (69) of the cover body (60A-60G), and the cushion body (67) is protected from mechanical damage at the outer circumference (69) of the cover body (60A-60G) by the support wall body (64), the processed wall body (65), and the connecting device (100A-100G).

28. The polishing pad according to claim 3 or 27, characterized in that the support wall body (64) and / or the processed wall body (65) are made of a different material from the cushion body (67) and / or a material having higher tensile strength than the cushion body (67) and / or a material having higher impact resistance than the cushion body (67) and / or a material having a higher density than the cushion body (67) and / or a material being harder than the cushion body (67).

29. The polishing pad according to 3, 27, or 28, characterized in that the support wall body (64) and / or the processed wall body (65) are made of a woven material.

30. The connecting device (100A-100G) includes a seam (101) or a plurality of spaced-apart connecting bodies, or is formed by a seam (101) or a plurality of spaced-apart connecting bodies. The polishing pad according to any one of claims 3, 27 to 29, characterized in that the seam (101) or the connecting body connects the support wall body (64) and the processed wall body (65) to each other, particularly directly.

31. The connecting device (100A-100G) is formed by material bonding, or by material bonding (101A), particularly by welding and / or adhesive bonding. The polishing pad according to any one of claims 3, 27 to 30, characterized in that the material bond (101A) connects the support wall body (64) and the processed wall body to each other, particularly directly.

32. The polishing pad according to any one of claims 3, 27 to 31, characterized in that the connecting device (100A-100G) includes at least one ring body (102-107) that at least partially surrounds the outer circumference (69) of the cover body, particularly like a fastener.

33. The polishing pad according to claim 3 or 32, characterized in that the at least one ring body (102-107) has at least one peripheral wall portion (102A) that covers the cushion body (67) on the outer circumference (69) of the cover body (60A-60G), and / or has at least one leg portion (102B, 102C) that supports the flat side (64F) of the support wall body (64) or the flat side (65F) of the processed wall body (65) or the flat body of the polishing pad.

34. The polishing pad according to claim 3, 32, or 33, wherein the at least one ring body (102-107) clamps the processed wall body (65) to the support wall body (64) and / or the flat body and / or includes ring bodies (102-107) on opposite sides, particularly connected to each other by connecting bodies and / or rivets and / or bolts, wherein the processed wall body (65) and the support wall body (64) are held in a sandwich-like manner between the ring bodies.

35. The polishing pad according to claim 3, 32, 33, or 34, characterized in that the at least one ring body (102-107) is sandwiched between the processed wall body (65) and the support wall body (64), or has a section disposed between the processed wall body (65) and the support wall body (64).

36. The polishing pad according to any one of claims 3, 32 to 35, characterized in that the ring body (102-107) is elastic or has an elastic portion and is deformable by a force acting on the processed wall body (65) in the direction of the support wall body (64).

37. The cushion body (67) has a large central area (69Z) where it is positioned, and the connecting devices (100A-100G) extend around it. The polishing pad according to any one of claims 3, 27 to 36, characterized in that the central region (69Z) does not have a connecting portion that penetrates the cushion body (67) between the processed wall body (65) and the support wall body (64).

38. The polishing pad according to any one of claims 3, 27 to 37, characterized in that the processed wall body (65) has a large central region (69Z) that protrudes further in front of the support wall body (64) than the outer circumference (69) of the cover body (60A-60G).

39. The polishing pad according to any one of claims 3, 27 to 38, characterized in that a plurality of outlet openings (63E) for contaminated air are located on the flat side (65F) of the processed wall body (65) and are connected to a plurality of outlet openings (63A) on the flat side (64F) of the support wall body (64) via a plurality of passages (63).

40. The polishing pad according to any one of claims 3, 27 to 39, characterized in that the cavity (57) surrounded by the support wall body (64) and the processed wall body (65) is provided between the cushion body (67) and the outer circumference (69) of the cover body (60A to 60G).

41. A sander (15) having a drive motor (25) for driving an output unit (26), and a polishing pad (40) fixed to the output unit (26) according to any one of claims 1 to 40, A sander (15) having an anti-sealing element (36) for contacting the polishing pad (40) and / or the anti-sealing element (80) of the polishing pad (40).

42. The sander (15) according to claim 41, characterized in that the opposite sealing element (36) has an elastic ring body (37) made of an elastic material.

43. The sander (15) according to claim 42, characterized in that at least one contact body (38) made of a material harder than the elastic material, particularly metal, is embedded in the elastic ring body (37) and is provided for polishing contact with the sealing element (80).

44. The sander (15) according to any one of claims 41 to 43, characterized in that it has an eccentric bearing device (27) for eccentrically driving the polishing pad (40).

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