Cushion element for a disc tool, disc tool and machine tool having a disc tool

Abstract

The invention relates to a cushion element (50) for a disc tool (20), which is provided for use on a machine tool (10) for grinding and / or polishing a workpiece (WT), wherein the cushion element (50) has a cushion body (52) made of an elastic material and a retaining wall element (53) for retaining the cushion element (50) on a carrier (30) of the disc tool (20), wherein the cushion element (50) has at least one bolt through opening (60), extending along an insertion axis (S), for a retaining bolt (40) which can be inserted through the bolt through opening (60) along the insertion axis (S) and can be fastened in a retaining receptacle (27), in particular a screw receptacle (28), of the carrier (30) for fastening the cushion element (50) to the carrier (30) such that the cushion element (50) is held sandwiched, in particular tensioned or clamped, between a bolt head (41) of the retaining bolt (40) and the carrier (30), said bolt head being supported on the retaining wall element (53), and wherein on a machining side (BS) of the retaining wall element (53) facing away from the cushion body (52), a grinding means (100) or polishing means for grinding and / or polishing the workpiece (WT) is arranged. According to the invention, the cushion element (50) and / or the retaining wall element (53) has, at a radial distance to the insertion axis (S) of the at least one bolt through opening (60), at least one recess (71) which extends in the circumferential direction (U) about the insertion axis (S) of the bolt through opening (60) between lateral edge regions (72) of the at least one recess (71), wherein the lateral edge regions (72) are connected to one another at a side facing the bolt through opening (60) by means of a connection portion (75), more particularly a connection piece.

Description

[0001] Cushion element for a disc tool, disc tool and processing machine with disc tool

[0002] The invention relates to a cushion element for a disc tool, which is intended for use on a processing machine, in particular a grinding machine or polishing machine, for grinding and / or polishing during processing of a workpiece, wherein the cushion element has a cushion body made of an elastic material, in particular foam, and a retaining wall element for holding the cushion element on a carrier of the disc tool, wherein the cushion element has at least one bolt passage opening extending along a plug-in axis for a retaining bolt, which can be inserted through the bolt passage opening along the plug-in axis and can be fastened in a holding receptacle, in particular a screw receptacle, of the carrier for fastening the cushion element to the carrier,so that the cushion element, when fastened to the support, is held in a sandwich-like manner between a bolt head of the retaining bolt, which is supported on the retaining wall element, and the support, in particular tensioned or clamped, wherein an abrasive or polishing agent for grinding and / or polishing the workpiece is arranged on a processing side of the retaining wall element facing away from the cushion body or is releasably attachable to an adhesive layer arranged on the processing side of the retaining wall element. The invention further relates to a disk tool equipped with such a cushion element and to a processing machine with such a disk tool.

[0003] Such a cushion element is described, for example, in DE 10 2021 121 566. The cushion element has several bolt through-openings arranged in a ring around a center of the cushion element. The bolt through-openings are designed as recesses or have recesses so that a bolt head can penetrate into the respective recess. Radial slots are provided at the bolt through-openings so that the bolt head can displace material from the cushion element.

[0004] Further cushion elements for disc tools are explained, for example, in US 3,808,753 A, EP 1 524 077 A1 and DE 102016 226273 A1.

[0005] However, there is a risk that the material of the cushion element could slip through these slots at the bolt penetrations and get past the bolt heads. This could then cause the cushion element to detach from the support.

[0006] It is therefore the object of the present invention to provide an improved cushion element for a disc tool for a processing machine. A further object is to provide an improved disc tool equipped with a cushion element and a processing machine with an improved disc tool.

[0007] To achieve the object, in a cushion element of the type mentioned at the outset, it is provided that the cushion element and / or the retaining wall element has at least one recess at a radial distance from the plug-in axis of the at least one bolt passage opening, which recess extends in the circumferential direction around the plug-in axis of the bolt passage opening between side edge regions of the at least one recess, wherein the side edge regions are connected to one another on a side facing the bolt passage opening by a connecting section, in particular a connecting web.

[0008] To achieve the object, a plate tool with a cushion element according to the invention and a processing machine with a plate tool which has the cushion element are also provided.

[0009] The processing machine is preferably a grinding machine or a polishing machine, or a combined grinding and polishing machine. The processing machine is preferably a hand-held processing machine, in particular a hand-held grinding machine. The processing machine can be designed, for example, as a long-neck grinder, meaning that, for example, a handle of the processing machine has an elongated or rod-shaped configuration.

[0010] The processing machine has, for example, an electric or pneumatic drive motor.

[0011] The processing machine preferably has an eccentric gear and / or an oscillation gear and / or a gear for generating a hypercycloid drive movement of the tool holder to which the disk tool can be releasably fastened.

[0012] A fundamental concept of the present invention is that one or more recesses are arranged around a respective bolt passage opening on the cushion element and / or retaining wall element, which, however, are closed to the plug-in axis or the inner circumference of the bolt passage opening. This allows the bolt head to rest on the respective connecting web or connecting section, so that the cushion element has a better hold on the support.

[0013] A connecting section or connecting web can, for example, be connected to a head support area provided for supporting the bolt head of the retaining bolt, or can form a component of the head support area. Several connecting sections or connecting webs of recesses can form a, particularly closed, annular head support area around the bolt passage opening.

[0014] The at least one recess has, for example, angular and / or triangular and / or almond-shaped side edge regions, at least when the retaining bolt loads the cushion element in the area of ​​the recess toward the support. The at least one recess is, for example, approximately almond-shaped, especially when the retaining bolt loads the cushion element in the area of ​​the recess toward the support.

[0015] It is possible that only one or advantageously several recesses are arranged around the bolt passage opening, which have side edge regions connected to the bolt passage opening or its plug-in axis by a connecting section or a connecting web.

[0016] It is also possible for recesses in the form of slots or the like to extend around the bolt passage opening, which are designed as radial slots or the like, i.e. are not closed towards the bolt passage opening or its plug-in axis.

[0017] Furthermore, it is possible that only a single connecting section towards the bolt passage opening or its plug-in axis is provided on the recess, while the recess can be open radially outwards.

[0018] The retaining wall element is preferably intended and configured to be arranged on a side of the cushion element facing away from the support when the cushion element is mounted on the support, or to hold the cushion body to the support. Thus, the retaining wall element forms a component or side of the cushion element facing away from the support.

[0019] The bolt head of the retaining bolt, which rests on the retaining wall element or cushion element, forms a recess, for example, when the cushion element is mounted on the support and held to the support by the retaining bolt. The at least one recess enables or facilitates the formation of such a recess when the bolt head of the retaining bolt rests next to the recess on the outer circumference of the bolt passage opening.

[0020] It is advantageous if there is no recess and / or cutout for accommodating the bolt head on or next to the bolt passage opening if the retaining bolt does not load the cushion element in the direction of the support. For example, there is no recess for the bolt head on the cushion element, in particular the retaining wall element and / or the cushion body, extending around the bolt passage opening. A trough only forms in sections when the bolt head applies pressure to the cushion element in the direction of the support.

[0021] In principle, it is possible for the side edge regions of the recess which delimit the at least one recess with respect to the circumferential direction around the plug-in axis to have an angular distance from one another with respect to the circumferential direction.

[0022] This angular distance between the side edge regions with respect to the circumferential direction is, for example, at least 2 degrees, preferably at least 3 degrees, even more preferably at least 4 degrees. However, the angular distance can also be greater, for example 5 degrees, 7 degrees, 8 degrees, 9 degrees, or the like. Furthermore, it is advantageous if the angular distance is at least 10 degrees in the circumferential direction. Thus, the recess is, so to speak, wide open in the circumferential direction. In the radial direction with respect to the plug-in axis, however, it is advantageous that the inner circumference of the recess has no distance from one another, at least when it is not loaded by the at least one retaining bolt or its bolt head.

[0023] The lateral edge regions of the at least one recess preferably already have the angular spacing with respect to the circumferential direction when not acted upon by the bolt head and / or in a relaxed state and / or when the cushion element and / or the retaining wall element are not subjected to force. Thus, the angular spacing between the lateral edge regions of the at least one recess is already present even when no bolt head is acting on the cushion element and / or the retaining wall element. This distinguishes the recess from the slots of the known cushion element already mentioned above, which extend radially away from the bolt passage opening.At this point it should be mentioned that the aforementioned embodiment, whereby the lateral edge regions which delimit the at least one recess in the circumferential direction around the plug-in axis are at an angular distance from one another in the circumferential direction, does not necessarily require that this recess be connected to one another on a side facing the bolt passage opening by a connecting section, for example a connecting web. For example, the recess can be open or openable towards the bolt passage opening. It is also possible for sections of such a connecting section or connecting web to be present on such a recess, the lateral edge regions of which already have an angular distance from one another in the circumferential direction when not acted upon by the bolt head. These connecting sections are suitable, for example, for the bolt head to be supported on these connecting sections.It is also possible that there is only a single such connecting section, which extends from one side edge region towards the other side edge region, but is not connected to this other side edge region.

[0024] The angular distance between the side edge regions is preferably dimensioned such that it allows the at least one recess to expand radially relative to the plug-in axis when subjected to a load from the bolt head in the direction of the carrier. Thus, the at least one recess can expand radially when subjected to a load from the bolt head in the direction of the carrier.

[0025] An action on the cushion element by the bolt head within the meaning of this description is to be understood as the bolt head acting in the direction of the support and thus tensioning or clamping the cushion element against the support.

[0026] It is advantageously provided that the recess expands more in the radial direction than in the circumferential direction when the cushion element is subjected to a load by the bolt head in the direction of the carrier, and / or that the recess widens in the radial direction and narrows in the circumferential direction when subjected to a load by the bolt head. One embodiment can provide that the circumferential edge regions are spaced closer to one another than the lateral edge regions. Thus, the lateral edge regions are angularly spaced in the circumferential direction and further apart than the circumferential edge regions are spaced from one another in the radial direction.

[0027] It is possible for the peripheral edge regions of the at least one recess to have a greater radial distance from one another in the region of the side edge regions than between the side edge regions. For example, the recesses or an inner circumference of a respective recess can have a bone-like shape or a bone-like contour, i.e., the end regions are widened, for example, while a constriction or waist is present between the end regions.

[0028] It is advantageous if the at least one recess has an arcuate shape around the plug-in axis. For example, the recess is circular or has a circular or circular-segment-shaped shape. The peripheral edge regions, for example, have an arcuate or annular shape.

[0029] Each recess preferably extends only over an angular section with respect to the circumferential direction. The angular section is, for example, a maximum of 15 degrees, in particular a maximum of 10 degrees, more preferably a maximum of 5 degrees. Recesses can be provided that have a larger angular distance between their side edge regions and recesses that have a smaller angular distance between their side edge regions.

[0030] The cushion element is preferably configured such that the at least one recess forms part of an arrangement of a plurality of recesses extending circumferentially around the at least one bolt passage opening, which is explained below as a recess arrangement. The at least two recesses of the recess arrangement are angularly spaced from one another with respect to the circumferential direction and / or with respect to the insertion axis of the bolt passage opening. The at least two recesses or the plurality of recesses of the recess arrangement that extend around the bolt passage opening can have the same or substantially the same radial distance with respect to the insertion axis or the bolt passage opening.Advantageously, at least two of the recesses have side edge regions which are each connected to one another on their side facing the bolt passage opening by a connecting section, for example a connecting web.

[0031] With respect to the at least one bolt passage opening, the recess arrangement preferably has mutually opposing recesses, each of which is connected to the side facing the bolt passage opening by a connecting section, for example a connecting web. Thus, the bolt head can be supported on such a connecting section or connecting web on the opposite sides of the bolt passage opening.

[0032] The recess arrangement surrounds the at least one bolt through-opening in the circumferential direction, preferably in a ring shape around the plug-in axis, in a range of at least 180 degrees, preferably at least 220 degrees, or more preferably at least 270 degrees. It is particularly advantageous if the recess arrangement completely or essentially completely surrounds the bolt through-opening in the circumferential direction. Thus, several recesses are provided in a ring shape around the bolt through-opening, which are flexible within the meaning of the invention when the cushion element, and in particular the retaining wall element, is subjected to a force in the direction of the carrier by a force acting on the bolt head of a retaining bolt.

[0033] The recess arrangement, which extends around the at least one bolt passage opening, preferably comprises at least two arrangements of recesses extending in a ring shape around the bolt passage opening. These arrangements can, for example, be concentric. Thus, for example, arrangements of recesses extend along two rings, which can be concentric to one another but also eccentric, around the at least one bolt passage opening. At this point, it should be mentioned that the recesses preferably extend in a circular ring shape or in the shape of a circular segment around the recess, e.g., to form a circular arrangement. However, it is also possible for the recesses to extend in other shapes around the plug-in axis in a ring shape, for example, elliptically, rectangularly, or the like.

[0034] At least two recesses of the arrangement, which extend circumferentially around the at least one bolt passage opening, preferably have a radial distance and / or a circumferential distance from one another in the circumferential direction. The radial distance is a distance in the radial direction relative to the bolt passage opening or the insertion axis of the bolt passage opening.

[0035] A circumferential distance between recesses arranged directly adjacent to one another in the circumferential direction, which, for example, have the same radial distance with respect to the bolt through-hole or the plug-in axis of the bolt through-hole, is preferably smaller than a circumferential extent of at least one or both of the adjacently arranged recesses. Thus, in the circumferential direction, a greater recess length is present than a width of a spoke that forms the cushion element and / or the retaining wall element at the circumferential distance and / or for providing the circumferential distance.

[0036] The retaining wall element and / or the cushion element advantageously have a radial web between the side edge regions of recesses arranged directly adjacent to one another in the circumferential direction, which extend around the at least one bolt passage opening. The radial web is designed, for example, in the manner of a spoke.

[0037] Several radial webs or spokes may be provided at angular intervals from one another with respect to the circumferential direction.

[0038] If several annularly arranged arrangements of recesses are provided around the at least one bolt passage opening, it is advantageous if the radial webs provided between a respective ring of recesses are circumferentially spaced from one another with respect to the insertion axis of the at least one bolt passage opening or are offset from one another. Thus, in this embodiment, there is no radially continuous radial web that penetrates or divides several rings of annularly arranged recesses, but rather a type of stepped arrangement of radial webs formed with offsets in the circumferential direction.

[0039] The radial web preferably runs radially to the plug-in axis of the at least one bolt passage opening. This radial path can be strictly radial or straight radial, but can also have a different geometry, which will become clearer below.

[0040] The radial web may have, entirely or in a section, a directional component transverse to the radial direction with respect to the plug-in axis of the at least one bolt passage opening.

[0041] It is also possible for the radial web to run obliquely to the radial direction with respect to the plug-in axis, whereby the radial web has this oblique course entirely or in sections.

[0042] One embodiment of the invention, for example, provides several inclined radial webs. The radial webs each extend between recesses that extend circumferentially around the bolt passage opening. The inclined radial webs can be inclined in the same direction. However, it is also possible for two or more radial webs to be inclined in opposite directions. For example, a zigzag arrangement of radial webs is possible.

[0043] The radial web is preferably deformable, either entirely or at least in sections, in the circumferential direction around the bolt passage and / or radially relative to the plug-in axis when the cushion element is subjected to pressure by a bolt head that rests on the outer circumference of the at least one bolt passage. For example, the radial web can absorb a screw-rotary movement with which the bolt head is screwed or can deform in the sense of torsion as a result of a screw-rotary movement.

[0044] The radial web may have an entirely or essentially straight line.

[0045] However, it is also possible for the radial web to have one or more curved sections. The curved sections, for example, are curved in the same direction. However, it is also possible for the curved sections to be curved in opposite directions. A combination of oppositely curved and similarly curved sections is possible in a radial web.

[0046] An advantageous embodiment can provide for the curvatures of the radial web to decrease when pressure is applied by the cushion element through the bolt head in the direction of the support. For example, oppositely curved curved sections can be moved toward or away from each other when pressure is applied to the cushion element in the direction of the support by the bolt head.

[0047] The radial webs can, for example, be designed in the manner of spokes extending annularly around the at least one bolt passage opening. The radial webs preferably have angular spacings, in particular identical or different angular spacings, relative to one another in the circumferential direction.

[0048] The at least one recess is preferably delimited by a radial web at its opposing side edge regions or at its opposite side edge regions. The radial webs preferably have curved sections. The curvatures of the radial webs are advantageously oriented in opposite directions toward one another or away from one another, with the same radial distance relative to the insertion axis of the at least one bolt passage opening. Between at least two recesses extending in the circumferential direction around the at least one bolt passage opening or one of the bolt passage openings, there is preferably a circumferential distance with respect to the circumferential direction, wherein a third recess extends in the circumferential direction around the at least one bolt passage opening or the respective bolt passage opening over the circumferential distance between the at least two recesses.The third recess is spaced radially from the at least two recesses. For example, if a radial web is present between the first two recesses, this radial web extends only to the third recess and not beyond it.

[0049] The bolt passage opening can have a round inner circumference. However, it is also possible for the bolt passage opening to have a polygonal or polygonally rounded inner circumference, or a polygonal or polygonally rounded inner circumference contour. A polygonal inner circumference contour is, for example, approximately star-shaped.

[0050] Furthermore, it is possible for the bolt passage opening to have at least one slot extending radially relative to the plug-in axis up to the bolt passage opening. Thus, it is possible to have both: one or more slots extending up to the bolt passage opening, and one or more recesses that have lateral edge regions connected to one another by a connecting section or a connecting web on their side facing the bolt passage opening.

[0051] So far, only a single bolt through-opening and its one or more recesses extending around the bolt through-opening have been explained. Such a bolt through-opening can, for example, be arranged in a center of the cushion element. However, it is advantageous if several bolt through-openings are provided on the cushion element, of which at least two bolt through-openings, or most bolt through-openings, or even all bolt through-openings have at least one recess extending circumferentially around the respective bolt through-opening, the lateral edge regions of which are connected to one another on the side facing the respective bolt through-opening by a connecting section, for example a connecting web.

[0052] Advantageously, these bolt passage openings extend at equal angular intervals around a center of the cushion element.

[0053] The cushion element can have one or more flow openings and / or flow channels for the flow of dust-laden air or fresh air. When mounted on the support of the disc tool, these flow openings or flow channels are fluidly connected to flow channels on the support and / or the abrasive. For example, the flow openings can open out at the retaining wall element, meaning that they are aligned with openings in the abrasive when the abrasive is attached to the retaining wall element.

[0054] The adhesive layer of the retaining wall element or the retaining wall element as a whole is preferably designed as a hook-and-loop layer or has a hook-and-loop layer. The hook-and-loop layer preferably comprises hook-and-loop hooks. The abrasive or polishing agent can be detached or attached to the hook-and-loop layer using a hook-and-loop connection.

[0055] For example, the abrasive or polishing agent has loops or Velcro loops for attachment to the Velcro hook of the retaining wall element.

[0056] The cushion body is conveniently sandwiched between the retaining wall element and a support wall element. Thus, the cushion body acts as an intermediate layer between the retaining wall element and the support wall element.

[0057] The pillow body is preferably made of foam or a foam material.

[0058] The support wall element and / or the retaining wall element preferably have a higher tensile strength and / or shear strength than the cushion body. The support wall element preferably has an adhesive layer, in particular a hook-and-loop layer, or is designed as an adhesive layer or a hook-and-loop layer. The hook-and-loop layer preferably has hook-and-loop loops. Hook-and-loop hooks or a hook-and-loop layer are preferably arranged on the support, which interact with the support wall element. The adhesive layer can then also have, for example, form-fitting contours that can be brought into positive engagement with form-fitting contours arranged on the support.

[0059] The disc tool according to the invention comprises the carrier and at least one retaining receptacle for a screw bolt, wherein the carrier has one retaining receptacle or several retaining receptacles, in particular screw receptacles, for retaining bolts penetrating the cushion element. Advantageously, several retaining receptacles, in particular arranged in a ring shape, for screw bolts are arranged to fasten the cushion element to the carrier. Furthermore, it is advantageous if the carrier has an adhesive layer and / or Velcro layer on its side facing the cushion element, for example Velcro hooks, so that the cushion element can be fastened to the carrier not only by means of one or more retaining bolts, but also by means of an adhesive connection or Velcro connection.

[0060] The support and / or the cushion element are preferably disc-shaped or wall-like.

[0061] The retaining bolts preferably form part of the plate tool.

[0062] The retaining bolts are preferably made of plastic.

[0063] The support is preferably more rigid than the cushion element.

[0064] The cushion element and / or the support preferably have a round, in particular circular, outer peripheral contour. However, it is also possible for the support or the cushion element, or both, to have a polygonal, for example triangular or rectangular, outer peripheral contour. The outer peripheral contour is provided, for example, on the narrow sides of the cushion element and / or support. The side or surface with the largest extension, however, is provided, for example, by the retaining wall element.

[0065] It is advantageous if the cushion element has the at least one recess and / or the arrangement of the recesses at least in the region of the retaining wall element. However, it is also possible for the cushion element to have the above-described recess or recesses in other planes, for example in the region of the cushion body and / or the support wall element. The recesses are preferably provided as through-openings on the respective component of the cushion element or on the cushion element as a whole. Combinations of through-openings and trough-like recesses are readily possible. For example, the at least one recess on the retaining wall element can be a through-opening, while the cushion body has a depression in the region of the recess but no through-opening. The material of the cushion element is therefore somewhat weakened or less thick in the region of the recess.

[0066] The at least one bolt through-hole preferably extends through the cushion element as a whole. However, it is also possible for the bolt through-hole to be provided only on the retaining wall element, and for a respective retaining bolt to penetrate the cushion element and be screwable into the support, for example, by severing or piercing the cushion body and / or the support wall element.

[0067] The cushion body and the support wall element and / or the cushion body and the retaining wall element are preferably connected to one another in a planar manner, for example welded and / or glued to one another.

[0068] The pillow body, for example, is made of a foam material.

[0069] The support wall element and / or the retaining wall element preferably consist of a textile fabric or comprise a textile fabric. Exemplary embodiments of the invention are explained below with reference to the drawings. They show:

[0070] Figure 1 is a schematic sectional view of a processing machine with a plate tool and a cushion element according to the invention,

[0071] Figure 2 is a perspective oblique view from an underside or processing side of a disk tool with carrier, cushion element and abrasive in exploded view,

[0072] Figure 3 is a perspective oblique view of the cushion element according to Figure 2,

[0073] Figure 4 shows a partial section through the cushion element according to Figure 2, approximately along a section line AA in Figure 2,

[0074] Figure 5 is a perspective oblique view of a detail D1 of the cushion element according to Figure 3 in the state not loaded by a fastening bolt,

[0075] Figure 6 shows the detailed view corresponding to Figure 5, with the cushion element being loaded by a retaining bolt,

[0076] Figure 7 shows the detail according to Figure 6, but the retaining bolt is not shown,

[0077] Figure 8 is a frontal plan view of a first variant of an arrangement of recesses around a bolt passage opening, approximately corresponding to the detail D1 according to Figure 3

[0078] Figure 9 shows a further variant of a bolt passage opening with recesses arranged around it, also in a frontal plan view corresponding to detail D1, and Figure 10 shows a third variant of a bolt passage opening with recesses arranged around it, also approximately corresponding to the plan view of detail D1 according to Figure 3.

[0079] A processing machine 10 is shown in cross-section and partially schematically in Figure 1. For example, the processing machine 10 is a grinding machine and / or polishing machine. The processing machine 10 is hand-held or can be guided by hand. For example, an operator can grasp the processing machine 10 by a handle 12. The handle 12 protrudes, for example, from a housing 11 of the processing machine 10. The handle 12 can be fixedly arranged on the housing 11 or can be articulated. In particular, the handle 12 is designed as a handle bar so that the processing machine 10 can be conveniently guided along walls, ceilings, or the like, for example. The grinding tasks that arise there entail high mechanical stress, which a disc tool 20, which is arranged or can be arranged on the processing machine 10, takes into account. This will become clearer below.

[0080] A drive motor 13, for example, an electric or pneumatic drive motor, is arranged in the housing 11 of the processing machine 10. The drive motor 13 drives a tool holder 15 via a gear 14. The tool holder 15 is designed, for example, as a driving projection or driving receptacle for the disc tool 20. The disc tool 20, driven by the drive motor 13, is used for machining, for example, for grinding, a schematically illustrated workpiece WT.

[0081] The plate tool 20 has a drive receptacle 25 with which the plate tool 20 can be fastened to the tool holder 15, e.g., screwed thereto or the like. The tool holder 15 and the drive receptacle 25 can, for example, have matching and / or complementary form-fitting contours, bayonet contours, or the like. In any case, the plate tool 20 can be releasably fastened to the tool holder 15 using the drive receptacle 25. The drive receptacle 25 is arranged or formed on a tool holder body 21 of the plate tool 20. The tool holder body 21 has a base body 22, designed, for example, as a plate or plate-like, which is fastened to a base body 32 of a carrier 30 of the plate tool 20.For this purpose, for example, form-locking bodies 23, in particular form-locking projections which protrude from the base body 22, as well as form-locking receptacles 33 on a holding receptacle 31 of the carrier 30 for the tool holding body 21 are provided.

[0082] In addition, the tool holder body 21 is screwed to the carrier 30. For example, through-openings 34 are provided on the carrier 30 and screw receptacles 24 are provided on the tool holder body 21. Screws 24A, for example, are inserted through the through-openings 34 and screwed into the screw receptacles 24.

[0083] Thus, the tool holder body 21 is detachably attached or attachable to the carrier 30. Of course, the tool holder body 21 can be integral with the carrier 30 or formed by the carrier 30.

[0084] In any case, it can be seen that the fastening of the tool holding body 21 to the carrier 30 can transmit high torques and large forces.

[0085] For example, the gear 14 is an eccentric gear or has an eccentric gear. It is also possible for the gear 14 to generate a hypercycloid drive motion with which the tool holder 15 drives the disk tool 20. For example, the tool holder 15 is driven or drivable in a rotational and / or eccentric and / or hypercycloid manner about the tool axis W by the drive motor 13 and the gear 14.

[0086] Now, it would be possible in principle for a cushion element to be permanently arranged on the carrier 30, which carries the abrasive 100 explained in more detail below. However, in practice, wear also occurs with cushion elements, which is why the cushion element 50 explained below is detachably attached to the carrier 30. The carrier 30 has, on a side facing away from the drive mount 25, which can also be referred to as the processing side, an adhesive layer or hook-and-loop layer 35, to which the cushion element 50 can be detachably attached using an adhesive layer, in particular a hook-and-loop layer 55. For example, hook-and-loop hooks are arranged on the carrier 30, which can form a hook-and-loop connection with hook-and-loop loops of the hook-and-loop layer 55. Thus, the cushion element 50 is held or can be attached flat to the carrier 30.

[0087] The cushion element 50 has a sandwich-like construction. The cushion element 50 has a cushion body 52, for example, made of foam or other similar elastic material. The cushion body 52 is arranged between a support wall element 51 and a retaining wall element 53. The support wall element 51 and / or the retaining wall element 53 are more tensile-resistant or can withstand greater tensile loads than the cushion body 52. ​​Thus, the elements 51 and 53 serve, so to speak, a protective or retaining function for the cushion body 52.

[0088] For example, the adhesive layer, in particular adhesive layer, 55 of the cushion element 50 is arranged on the support wall element 51, namely on a side of the support wall element 51 facing away from the cushion body 52.

[0089] The support wall element 51 and / or the retaining wall element 53 are, for example, glued, welded or the like firmly connected to the cushion body 52.

[0090] On a side facing away from the cushion body 52, the retaining wall element 53 can, for example, directly comprise an abrasive or polishing agent, for example a granular material, a loop material, or the like. However, this is not the case in the exemplary embodiment. Rather, it is provided that an abrasive 100, which can also be a polishing agent, can be detachably fastened to the cushion element 50, namely to an adhesive layer 54, which the retaining wall element 53 has on its side facing away from the cushion body 52, which can be referred to as the processing side BS. For example, the adhesive layer comprises a hook-and-loop layer. The hook-and-loop layer expediently comprises hook-and-loop hooks. An adhesive layer 104 interacting with the adhesive layer 54 is arranged on the abrasive 100, which is designed, for example, as a grinding wheel.In any case, the abrasive 100 can be removably attached to the cushion element 50 by means of the adhesive layers 54, 104.

[0091] The abrasive 100 comprises a base body 102, which has an abrasive layer 105, for example, abrasive grains or the like, on its side facing away from the adhesive layer 104. The abrasive layer 105 can also be configured as a polishing layer. Furthermore, the abrasive layer 105 can comprise a knitted abrasive fabric or abrasive cloth.

[0092] Dust generated during the grinding of a workpiece can be extracted or conveyed away by the processing machine. For this purpose, inlet openings 106 are provided on the abrasive 100, flow openings 56 on the cushion element 50, which can also be referred to as throughflow openings, and inlet openings 36 on the carrier 30. The inlet openings 36 communicate fluidically with outlet openings arranged on the side of the drive mount 25 (not shown in the drawing), through which dust-laden air can escape from the disc tool 20 and be guided, for example, to a dust outlet on the housing 11 of the processing machine 10.

[0093] The inflow openings 36 have funnels 37. The flow openings 56 are arranged in row arrangements 57 that fluidically match the funnels 37. The inflow openings 106 are arranged in row arrangements 107 that correspond to the row arrangements 57. When the cushion element 50 is attached to the carrier 30 and the abrasive 100 is attached to the cushion element 50, the inflow openings 106, the flow openings 56, and the inflow openings 36 are fluidically connected and / or aligned with one another. The row arrangements 57 and 107 radiate from a center Z of the disc tool 20. The center Z corresponds to the tool axis W when the disc tool 20 is attached to the tool holder 15.

[0094] The plate tool 20 has a circular shape. Of course, the plate tool 20 could also have a polygonal shape, for example, triangular or rectangular, or be elliptical, or the like.

[0095] Advantageously, the cushion element 50 can already have a flat hold on the carrier 30 by the adhesive connection or Velcro connection using the adhesive layer 55 and the adhesive layer 35 when the cushion element 50 is fastened to the carrier 30.

[0096] In addition, a screw connection is also provided, namely using retaining bolts 40.

[0097] The retaining bolts 40 are arranged in a ring around the center Z. The retaining bolts 40 have bolt heads 41 from which screw portions 42 extend.

[0098] The retaining bolts 40 can be screwed into retaining receptacles 27, for example screw receptacles 28, of the support 30, penetrating the cushion element 50. Screw sections 29 are provided on the retaining receptacles 27, into which the screw sections 42 of the retaining bolts 40 can be screwed.

[0099] The retaining bolts 40 can be inserted with their screw sections 42 through the bolt passage openings 60 along plug-in axes S and screwed into the screw receptacles 28 of the carrier. For this purpose, tool actuation contours, for example slots 43, are provided on the bolt heads 41.

[0100] The bolt heads 41 have a flat shape so that they can be supported on the outer circumference of a respective bolt passage opening 60 against the material of the cushion element 50, in particular on the retaining wall element 53. However, this compresses and possibly also displaces the material of the cushion body 52, which could in itself lead to a bulging of the retaining wall element 53 in the periphery or outside around the respective bolt heads 41 if they apply force to the cushion element 50 in the direction of the support 30. The following measures have been taken to counteract this:

[0101] Starting from an inner circumferential contour 61 of a respective bolt passage opening 60, radial slots 62 extend into a head support region 63 provided for supporting the bolt head 41. These allow the material of the cushion element 50, for example, the cushion body 52, to expand slightly when a retaining bolt 40 acts on the cushion element 50 in the direction of the carrier 30.

[0102] In addition, however, the application of force to the cushion element 50 by the retaining bolt 40 or the bolt head 41 leads to the formation of a depression, for example a depression 58 shown in Figures 6 and 7, the formation of which is facilitated and improved by the measures explained below. In particular, it is avoided that the cushion element 50 forms a bulge around a respective bolt head 41 in the direction away from the carrier 30. In this case, the abrasive 100 would no longer lie flat in a plane, but would have contours protruding in the direction of the workpiece surface to be machined or in the direction of the abrasive layer or in front of the abrasive layer 105, which could lead to an uneven grinding pattern and / or premature wear of the abrasive 100 in the region where the cushion element 50 is attached to the carrier 30 by the retaining bolts 40.

[0103] Recess arrangements 70 with recesses 71 extend around the bolt passage openings 60. The recesses 71 are arranged in a ring around the plug-in axis S or the bolt passage opening 60 and have an annular contour. Each recess 71 has lateral edge regions 72 which have an angular distance WA in a circumferential direction U with respect to the plug-in axis S. Between the lateral edge regions 72 of a recess 71, radially inner circumferential edge regions 73 extend with respect to the bolt passage opening 60 or the plug-in axis S, as well as radially outer circumferential edge regions 74 opposite these. The circumferential edge regions 73 and 74 are provided by connecting sections 75 and 76, i.e. the recesses 71 are annular or closed at their edge regions. The connecting sections 75 are designed or formed, for example, as connecting webs 75A.

[0104] The radially inner peripheral edge regions 73 of the recesses 71 of the inner ring 77 are connected to one another in the circumferential direction with respect to the plug-in axis S and form the head support region 63.

[0105] A plurality of rings extend around a respective bolt passage opening 60, for example a ring 77 from the radial inside with respect to the plug-in axis S or bolt passage opening 60, another ring 78 with a greater radial distance from the plug-in axis S, a ring 79 with an even greater radial distance from the plug-in axis S, and finally an outer ring 80 which has the greatest distance of the rings 77, 78, 79 and 80 in the radial direction with respect to the plug-in axis S. Each of the rings 77, 78, 79, 80 has recesses 71 which are at an angular distance from one another in the circumferential direction with respect to the plug-in axis S.

[0106] As can be seen from Figure 5, the recesses 71 are slit-shaped or designed as slots in the still unloaded state of the cushion element 50, when no retaining bolt 40 is yet acting on the cushion element 50. Thus, the peripheral edge regions 73, 74 abut one another. However, when the compressive load of the retaining bolt 40 occurs in the direction of the support 30, i.e., when the retaining bolts 40 are screwed into the screw receptacles 28, the situation shown in Figure 6 arises. Then the recesses 71 widen in the radial direction, ie the peripheral edge regions 73 and 74 have greater distances from one another than when the cushion element 50 is still unloaded by the bolts 40. This also makes it possible for the material of the retaining wall element 53 to yield towards the bolt passage opening 60 in the sense of a tensile load and any bulging of the cushion element 50 in the outer circumference around a respective bolt passage opening 60 is avoided.

[0107] Between the recesses 71 of the inner ring 77, radial webs 77A are provided which are oriented radially to the plug-in axis S, the sides of which are facing away from each other each providing a side edge region 72 of immediately adjacent recesses 71.

[0108] The radially outermost ring 78 relative to the inner ring 77 has radial webs 78A between its recesses 71. The radially outermost ring 79 has radial webs 79A between its recesses 71. The outer ring 80 comprises radial webs 80A between its recesses 71.

[0109] The recesses 71 of adjacent rings 77 and 78, as well as 78 and 79, and 79 and 80, have an angular offset or angular spacing in the circumferential direction with respect to the plug-in axis S. Thus, the radial webs 77A between the recesses 71 of ring 77 are opposite the recesses 71 of ring 78, with the radial webs 77A of this ring being opposite the recesses 71 of the radially nearest ring 79. The radial webs 79A are opposite the recesses 71 of the outer ring 80. The radial webs 80A open, so to speak, into the largest surface of the cushion element 50 or the retaining wall element 53 and / or are integral with this largest surface.

[0110] The bolt passage openings 60 are arranged in a ring around the center Z of the plate tool 20. For example, a bolt passage opening 60 is provided between each two radially extending row arrangements 57 of the cushion element 50. It is advantageous if each bolt passage opening 60 is assigned a recess arrangement 70, so that the aforementioned effect, namely the formation of the trough 58 with, in particular, radial, widening of the recesses 71, is enabled at all bolt passage openings 60 without a bulge formation.

[0111] The embodiment according to Figure 8 represents a variation of the embodiment of Figures 2 to 7. Instead of the bolt passage openings 60, bolt passage openings 160 are provided in the only partially illustrated cushion element 150, which is otherwise similar to the cushion element 50. The bolt passage openings 160 have star-shaped inner circumferential contours 161, but no radial slots in the manner of the radial slots 62. The bolt passage openings 160 are surrounded by head support regions 163 for supporting the bolt heads 41, which surround the respective bolt passage opening 160 in an annular manner.

[0112] The bolt passage openings 160 are surrounded by recess arrangements 170, which include recesses 171 that are functionally similar to the recesses 71. Lateral edge regions 172 of the recesses 171 are at an angular distance relative to the plug-in axis S or bolt passage opening 160. An inner circumferential edge region 173 and a radially outer circumferential edge region 174 extend between the side edge regions 172 with respect to the plug-in axis S. The side edge regions 172 are already widened radially with respect to the plug-in axis S when not loaded by the retaining bolts 40 in the direction of the carrier 30, ie the circumferential edge regions 173, 174 are at a greater distance from one another in the region of the side edge regions 172 of the recesses 171 than at a distance from the side edge regions 172. Thus, the side edge regions 172 are, so to speak, widened radially with respect to the plug-in axis or have widenings.The peripheral edge regions 173, 174, however, are close to one another in terms of distance from the side edge regions 172 in the state in which the retaining bolts 40 are still unloaded in the direction of the carrier 30, so that an approximately bone-shaped shape of the recesses 171 is given in the state in which the retaining bolts 40 are still unloaded, as shown in Figure 8.

[0113] The recesses 171 are in turn arranged annularly in rings 77, 78, 79, and 80 around the bolt passage opening 160. Reference is made to the relevant explanations regarding the recess arrangement 70. Radial webs 77A, 78A, 79A, and 80A extend between the recesses 171 of the rings 77, 78, 79, and 80, respectively. The recesses 171 of adjacent rings 77 and 78, 78 and 79 and 79 and 80 have an angular offset WV or angular distance in the circumferential direction with respect to the plug-in axis S, so that, as in the exemplary embodiment of the recess arrangement 70, the radial webs 77A, 78A, 79A and 80A of immediately adjacent rings 77, 78, 79 and 80 are not radially aligned with one another, but have an angular offset WV or angular distance with respect to the circumferential direction around the plug-in axis S.

[0114] It is advantageously provided that, for example, the radial webs 77A, 79A and 78A and 80A are each aligned with one another in the radial direction with respect to the plug-in axis S or bolt passage opening 160.

[0115] However, in a manner not shown in the drawing, it is also possible that, for example, the radial webs of immediately adjacent rings, for example the radial webs 77A, 78A and / or the radial webs 78A and 79A and / or the radial webs 79A and 80A, are each aligned with one another in the radial direction with respect to the plug-in axis S or bolt passage opening 160.

[0116] It is advantageously provided that, for example, the recesses 171 of the inner ring 77 are shorter in the circumferential direction with respect to the plug-in axis S than the recesses 171 of the radially next outer ring 78, whose recesses are in turn shorter than the recesses 171 of the ring 79. The recesses 171 of the ring 80 have the greatest length in the circumferential direction with respect to the plug-in axis S or the bolt passage opening 160.

[0117] A recess arrangement 270 of a cushion element 250 has only a ring of recesses 272, so to speak, extending around the bolt passage opening 260 of the cushion element 250. The cushion element 250 is only partially shown, namely only in the area of ​​the recess arrangement 270, with the cushion element 250 otherwise corresponding, for example, to the cushion element 50. The bolt passage openings 260 and the recess arrangements 270 are provided instead of the bolt passage openings 60 and the recess arrangements 70.

[0118] The bolt passage opening 260 has a closed, annular, in particular circular, inner circumferential contour 261. There are no radial slots like the slots 62. However, a certain amount of play in the circumferential direction around the bolt passage opening 260 or its insertion axis S is still present, which is indicated by an arrow PR, namely, for example, by the type of arrangement and design of the recesses 271. For example, the arrow PR shows how a respective retaining bolt 40 is screwed into a retaining receptacle 27 or screw receptacle 28, whereby it is supported around the region of the retaining wall element 53 extending around the inner circumferential contour 161 and applies a certain torsional force to it.

[0119] The recesses 271 have obliquely extending side edge regions 272, the oblique inclination of which runs obliquely to a radial direction R with respect to the plug-in axis S or bolt passage opening 260. The oblique inclination is, for example, approximately 20 to 60 degrees, preferably 30 to 50 degrees, more preferably 35 to 45 degrees.

[0120] Radially inward with respect to the plug-in axis S or bolt passage opening 260, the recesses 272 are narrower, i.e. the distance between their side edge regions 272 is smaller radially inward with respect to the plug-in axis S. Radially outward with respect to the plug-in axis S or bolt passage opening 260, the recesses 271 are widely spaced in the circumferential direction, i.e. the side edge regions 272 have the greatest distance from one another at the greatest radial distance from the plug-in axis S.

[0121] Overall, a smaller circumferential edge region 272 of the recesses 271 results close to the plug-in axis S, which is in any case smaller than the circumferential edge region 274 between the side edge regions 272 in the region of the greatest radial distance with respect to the plug-in axis S.

[0122] The peripheral edge regions 273, 274 are formed by connecting sections 275 and 276. The connecting sections 275 of all recesses 271 are connected to one another around the plug-in axis S, so to speak, so that a circular disk-shaped inner peripheral connecting section 275 is formed, against which a respective bolt head 41 can be supported when a retaining bolt 40 penetrates a bolt passage opening 260 and is screwed into a screw receptacle 28.

[0123] The radially outer connecting sections 276 of the recesses 272 are also connected to one another, so to speak, so that a circular ring-shaped closed circumference of the retaining wall element 73 results around a respective bolt passage opening 260.

[0124] If the retaining bolt 40 is now inserted into the bolt passage opening 60 and screwed into a screw receptacle 28, it is supported on the radially inner connecting section 275 and acts on it in the sense of a torsion, which is represented by the arrow PR, wherein the obliquely inclined radial webs 277A located between the recesses 272 assume a smaller oblique inclination with respect to the radial direction in relation to the plug-in axis S, which is represented in dashed lines. The radial webs 277A extend between the recesses 272 and have the already explained oblique course in the radial direction with respect to the plug-in axis S. Thus, it is possible to form an inner ring, which is formed by the connecting sections 275, and e.g.forms a head support area 263 in the sense of torsion when screwing in a retaining bolt 40, whereby the radial webs 277A yield and follow this rotational movement at least radially inward and change their oblique inclination.

[0125] This measure advantageously contributes to an effective avoidance of bulges or the like in the cushion element 250.

[0126] A single bolt passage opening 360 with a recess arrangement 370 is also shown as an example of a cushion element 350. The bolt passage opening 360 and the recess arrangement 370 can be provided at those locations on the cushion element 350, which is otherwise similar to the cushion element 50, where the cushion element 50 has the bolt passage openings 60 and the recess arrangements 70. A head support region 363 for supporting a bolt head 41 extends around each bolt passage opening 360.

[0127] The recess arrangement 370 has recesses 371A, 371B, the side edge regions 372 of which are formed by radial webs 377A, 377B or are provided on radial webs 377A, 377B, which do not have a straight line but have curved lines.

[0128] The recess arrangement 370 comprises only a single ring 377 of recesses 371 extending around the bolt passage opening 360. This has an annular, in particular circular, inner circumferential contour 361 and, in the present embodiment, no radial slots relative to the plug-in axis S. However, this would also be entirely possible, which incidentally also applies as an option for the inner circumferential contour 261 of the bolt passage opening 260.

[0129] In any case, the recess arrangement 370 comprises only a single, so to speak inner ring 377 of recesses 371.

[0130] The radial webs 377A, 377B extend substantially radially with respect to the bolt passage opening 360 or plug-in axis S, but have two different types of radial webs 81 and 82, which have curved sections 83, 84 and 85 which merge into one another from the radially inside with respect to the plug-in axis S or bolt passage opening 360 to the radially outside to the bolt passage opening 360 or to the plug-in axis S.

[0131] The curved sections 83 of opposing radial webs 377A, 377B are curved in opposite directions. Likewise, the curved sections 84 and 85 of opposing radial webs 377A, 377B are curved in opposite directions. This results in different recess geometries for the recesses 371A and 371B.

[0132] The recesses 371A have an approximately cross-shaped configuration. Radially inward and radially outward with respect to the plug-in axis S or bolt passage opening 360, the recesses 371A are, so to speak, narrower in the circumferential direction, i.e., the side edge regions 372 are located radially inward (shown as region 87 in the drawing) and radially outward (shown as region 88 in the drawing) close to one another in the circumferential direction with respect to the plug-in axis S. In an intermediate region 89, namely in the region of the curved sections 84 of the radial webs 81 and 82, a respective recess 371A widens, where the side edge regions 372A are at their greatest distance from one another in the circumferential direction with respect to the plug-in axis S or bolt passage opening 360.

[0133] The recesses 371 B are, so to speak, complementary to the recesses 371 A and have, for example, an approximately T-shaped configuration.

[0134] Their largest sections 90 and 91 have the recesses 371 B radially inward and radially outward relative to the plug-in axis S or bolt passage opening 60, while a type of waist or constriction 92 is formed between them. There, the curved sections 84 of the radial webs 81 and 82 are closest to each other, so to speak, and are thus curved or arched toward each other, which results in the constriction in the central region (in the radial direction relative to the plug-in axis S) of the recesses 371 B.

[0135] However, the curved sections 83, 84 and 85 allow a radial play or a radial adjustment or facilitate a radial adjustment or loading of the radial webs 81 and 82 when a retaining bolt 40 is screwed into a respective screw receptacle 28 or exerts pressure on the cushion element 350 in the direction of the carrier 30.

[0136] Dashed lines show how the radial webs 81 and 82 can deform when the cushion element 50 is loaded by the bolt 40. In particular, the central curved sections 84 move closer together when a retaining bolt 40 exerts force on the cushion element 350 in the direction of the support 30, as indicated by arrows Px. Naturally, the curved sections 83, 84, and 85 also facilitate torsional loading, for example, in the sense of a torsional loading according to the arrow PR in Figure 9.

Claims

Claims 1. A cushion element for a disc tool (20) intended for use on a processing machine (10), in particular a grinding machine or polishing machine, for grinding and / or polishing a workpiece (WT), wherein the cushion element (50) has a cushion body (52) made of an elastic material, in particular foam, and a retaining wall element (53) for retaining the cushion element (50) on a support (30) of the disc tool (20), wherein the cushion element (50) has at least one bolt passage opening (60) extending along a plug-in axis (S) for a retaining bolt (40), which can be inserted through the bolt passage opening (60) along the plug-in axis (S) and can be secured in a retaining receptacle (27), in particular a screw receptacle (28), of the support (30) for securing the cushion element (50) to the support (30).so that the cushion element (50), in a state fastened to the carrier (20), is held in a sandwich-like manner between a bolt head (41) of the retaining bolt (40) supported on the retaining wall element (53) and the carrier (30), in particular tensioned or clamped, wherein an abrasive (100) or polishing agent for grinding and / or polishing the workpiece (WT) is arranged on a processing side (BS) of the retaining wall element (53) facing away from the cushion body (52) or is detachably fastened to an adhesive layer (54) arranged on the processing side (BS) of the retaining wall element (53), characterized in that the cushion element (50) and / or the retaining wall element (53) has at least one recess (71) at a radial distance from the insertion axis (S) of the at least one bolt passage opening (60),which extends in the circumferential direction (U) around the plug-in axis (S) of the bolt passage opening (60) between side edge regions (72) of the at least one recess (71), wherein the side edge regions (72) at one of the bolt passage openings (60) are facing side by a connecting section (75), in particular a connecting web (75A).

2. Cushion element (50) according to claim 1, characterized in that the side edge regions (72) which delimit the at least one recess (71) with respect to the circumferential direction (U) around the insertion axis (S) have an angular distance (WA) with respect to one another with respect to the circumferential direction (U).

3. Cushion element (50) according to claim 2, characterized in that the angular distance (WA) is at least 2 degrees, preferably at least 3 degrees, more preferably at least 4 degrees, even more preferably at least 5 degrees, and / or the angular distance (WA) is at most 15 degrees, in particular at most 10 degrees, more preferably at most 5 degrees.

4. Cushion element (50) according to claim 2 or 3, characterized in that the side edge regions (72) of the at least one recess (71) have the angular distance (WA) in the state not acted upon by the bolt head (41) and / or in a relaxed state and / or in the state not acted upon by force of the cushion element (50) and / or the retaining wall element (53).

5. Cushion element (50) according to one of claims 2, 3 or 4, characterized in that the angular distance (WA) between the side edge regions (72) of the at least one recess (71) is dimensioned such that it enables an expansion of the at least one recess (71) in the radial direction with respect to the plug-in axis (S) when acted upon by the bolt head (41).

6. Cushion element (50) according to one of the preceding claims, characterized in that the at least one recess (71) has opposing peripheral edge regions (73, 74) which extend in the circumferential direction (U) around the insertion axis (S) between the side edge regions (72).

7. Cushion element (50) according to claim 6, characterized in that the peripheral edge regions (73, 74) of the at least one recess (71) have a small have a smaller distance from each other than the side edge regions (72) of the at least one recess (71) have from each other.

8. Cushion element (50) according to claim 6 or 7, characterized in that the peripheral edge regions (73, 74) of the at least one recess (71) have a greater radial distance from one another in the region of the side edge regions (72) than between the side edge regions (72).

9. Cushion element (50) according to one of the preceding claims, characterized in that the at least one recess (71) has an arcuate course around the plug-in axis (S).

10. Cushion element (50) according to one of the preceding claims, characterized in that the at least one recess (71) forms a component of a recess arrangement (70) of a plurality of recesses (71) extending in the circumferential direction (U) around the at least one bolt passage opening (60), wherein at least two of the recesses (71) have side edge regions (72) which are each connected to one another on their side facing the bolt passage opening (60) by a connecting section (75), in particular a connecting web (75A).

11. Cushion element (50) according to claim 10, characterized in that the recess arrangement (70) has, with respect to the at least one bolt passage opening (60), opposite recesses (71), which are each connected to one another on their side facing the bolt passage opening (60) by a connecting section (75), in particular a connecting web (75A).

12. Cushion element (50) according to claim 10 or 11, characterized in that the recess arrangement (71) surrounds the at least one bolt passage opening (60) in the circumferential direction (U) in a ring shape around the plug-in axis (S) in a range of at least 180 degrees, preferably at least 220 degrees, more preferably at least 270 degrees, even more preferably completely or substantially completely.

13. Cushion element (50) according to one of claims 10 to 12, characterized in that the recess arrangement (71) around the at least one bolt passage opening (60) comprises at least two arrangements (77, 78, 79, 80) of recesses (71) extending annularly around the bolt passage opening (60), in particular concentric with the insertion axis (S) of the bolt passage opening (60).

14. Cushion element (50) according to one of the preceding claims, characterized in that at least two recesses (71) which extend in the circumferential direction (U) around the at least one bolt passage opening (60) have a radial distance and / or a circumferential distance in the circumferential direction (U) from one another.

15. Cushion element (50) according to one of the preceding claims, characterized in that a circumferential distance between recesses (71) arranged directly next to one another in the circumferential direction (U) is smaller than a circumferential extent of at least one or both of the recesses (71) arranged next to one another.

16. Cushion element (50) according to one of the preceding claims, characterized in that the cushion element (50) and / or the retaining wall element (53) has a radial web (77A, 78A, 79A, 80A, 277A, 377A, 377B) between side edge regions (72) of recesses (71) arranged directly next to one another in the circumferential direction (U), which extend around the at least one bolt passage opening (60), in particular designed in the manner of a spoke and running radially to the insertion axis (S) of the at least one bolt passage opening (60).

17. Cushion element (50) according to claim 16, characterized in that the radial web (277A, 377A, 377B) has at least one section or as a whole a directional component transverse to the radial direction with respect to the plug-in axis (S) of the at least one bolt passage opening (60) and / or that the radial web (277A) runs obliquely to the radial direction with respect to the plug-in axis (S).

18. Cushion element (50) according to claim 16 or 17, characterized in that the radial web (277A, 377A, 377B) as a whole or at least in sections is deformable in the circumferential direction (U) around the bolt passage opening (60) and / or radially with respect to the plug-in axis (S) when the cushion element (50) is subjected to pressure by a bolt head (41) which is supported on the outer circumference of the at least one bolt passage opening (60).

19. Cushion element (50) according to one of claims 16 to 18, characterized in that the radial web (77A, 78A, 79A, 80A) has an overall or substantially rectilinear course.

20. Cushion element (50) according to one of claims 16 to 19, characterized in that the radial web (377A, 377B) has at least one curved section (83, 84, 85) or several curved sections (83, 84, 85), in particular curved in opposite directions.

21. Cushion element (50) according to one of the preceding claims, characterized in that the at least one recess (71) is delimited at its opposite side edge regions (72) in each case by a radial web (377A, 377B), wherein the radial webs (377A, 377B) have curved sections (83, 84, 85), wherein curvatures of the radial webs (377A, 377B) have an opposite course oriented towards or away from each other at the same radial distance with respect to the plug-in axis (S) of the at least one bolt passage opening (60).

22. Cushion element (50) according to one of the preceding claims, characterized in that between at least two recesses (71) which extend in the circumferential direction (U) around the at least one bolt passage opening (60), a circumferential distance with respect to the circumferential direction (U) is present and a third recess (71) extends in the circumferential direction (U) around the at least one bolt passage opening (60) over the circumferential distance between the min- at least two recesses (71 ), wherein the third recess (71 ) has a radial distance from the at least two recesses (71 ).

23. Cushion element (50) according to one of the preceding claims, characterized in that the bolt passage opening (60) has a star-shaped inner circumferential contour (161) and / or has at least one slot (62) extending radially with respect to the plug-in axis (S) up to the bolt passage opening (60) and / or has no radial slot in the circumferential direction (U) around the plug-in axis (S) or has a closed annular shape or inner circumferential contour (61, 161).

24. Cushion element (50) according to one of the preceding claims, characterized in that it has a plurality of bolt passage openings (60) arranged in the circumferential direction (U) around a center of the cushion element (50), of which at least two bolt passage openings (60) or most of the bolt passage openings (60) or all of the bolt passage openings (60) have at least one recess (71) extending around the respective bolt passage opening (60) in the circumferential direction (U), the side edge regions (72) of which are connected to one another on their side facing the respective bolt passage opening (60) by a connecting section (75), in particular a connecting web (75A).

25. Cushion element (50) according to one of the preceding claims, characterized in that it has flow openings (56) for the flow of dust air or fresh air.

26. Cushion element (50) according to one of the preceding claims, characterized in that the adhesive layer (54) of the retaining wall element (53) or the retaining wall element (53) as a whole is designed as a hook and loop layer, in particular having hook and loop hooks, or has a hook and loop layer, wherein the abrasive means (100) or polishing means can be releasably fastened to the hook and loop layer by means of a hook and loop connection.

27. Cushion element (50) according to one of the preceding claims, characterized in that the cushion body (52) is arranged in a sandwich-like manner between the holding wall element (53) and a support wall element (51).

28. Cushion element (50) according to claim 27, characterized in that the support wall element (51) has an adhesive layer (55), in particular a Velcro layer, or is designed as an adhesive layer or Velcro layer, wherein the Velcro layer preferably has Velcro loops.

29. Disc tool (20) with a cushion element (50) according to one of the preceding claims and a carrier (30) to which the cushion element (50) is or can be fastened by means of at least one retaining bolt (40) passing through the cushion element (50) at the at least one bolt passage opening (60) and preferably also by means of a hook and loop connection.

30. Processing machine (10), in particular a grinding machine or polishing machine, with a disc tool (20) according to claim 29.

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