SANDING PAD HAVING A SEALING ELEMENT AND A RIB STRUCTURE, AND SANDING MACHINE

Abstract

A sanding pad (40) for a sanding machine (15), including comprising a drive holder (49), situated on the machine side (41) of the sanding pad, to be fastened in a non-rotatable manner to a drive (26) of the sanding machine (15), such that the sanding pad (40) can be driven by the sanding machine in an in particular rotational and/or eccentric sanding motion that is suitable for sanding a workpiece (W); wherein the sanding pad has a machining side (42), which is opposite the machine side (41) and has a machining face (45) on which a sanding means (90) for abrasive machining of a workpiece (W) can be arranged so as to be fixed or removable using an adhesive layer (66); wherein inflow openings (48) for dust-laden dirty air (S) to flow in are situated in the machining face (45), and outflow openings (43) fluidically connected to the inflow openings via through-channels (59) are situated on the machine side (41).

Claims

1. A sanding pad for a sanding machine, comprising a drive holder, situated on a machine side of the sanding pad, to be fastened in a non-rotatable manner to a drive of the sanding machine, such that the sanding pad can be driven by the sanding machine; wherein the sanding pad comprises a machining side, which is opposite the machine side and has a machining face on which a sanding means for abrasive machining of a workpiece can be arranged so as to be fixed or removable using an adhesive layer, wherein inflow openings for dust-laden dirty air to flow in are situated in the machining face, and outflow openings fluidically connected to the inflow openings via through-channels are situated on the machine side; wherein the outflow openings are situated in a suction zone within an annular sealing element that is situated on the machine side for sealingly contacting a counter-sealing element of the sanding machine, wherein the sanding pad comprises a planar body which has a supporting wall provided for supporting the sanding means, which supporting wall is reinforced by a rib structure, the ribs of which project beyond the supporting wall towards the machine side, wherein the ribs delimit cavities which are closed by the supporting wall with respect to the machining side and are open with respect to the machine side, and wherein the sealing element covers at least some of the cavities towards the machine side.

2. The sanding pad of claim 1, wherein the sealing element and the planar body are integral or the sealing element and the planar body are separate components which are fixedly connected to one another.

3. The sanding pad of claim 1, wherein at least one cavity covered by the sealing element on the machine side is a demolding cavity formed by removing a casting core from the cavity.

4. The sanding pad of claim 1, wherein the sealing element, except for the outflow openings, covers and/or tightly closes all cavities of the planar body within the suction zone and/or on a flat side of the planar body and/or between the drive holder and an edge region of the planar body.

5. The sanding pad of claim 1, wherein the sealing element, except for the outflow openings, tightly closes at least a part of the cavities, so that a volume located in the respective cavity is closed dust-tight.

6. The sanding pad of claim 1, wherein the sealing element covers and/or tightly closes at least one, multiple, or all of the cavities provided and configured to form one or more through channels and/or at least one or all through channels.

7. The sanding pad of claim 1, wherein the sealing element rests flatly on the end faces of the ribs facing toward the sealing element.

8. The sanding pad of claim 1, wherein the sealing element is connected by means of welding, and/or adhesive bonding to the planar body.

9. The sanding pad of claim 1, wherein the sealing element and/or the planar body have at least one welding projection, for welding to the respective other component of the sealing element or planar body or are welded by means of the at least one welding projection to the respective other component of sealing element or planar body.

10. The sanding pad of claim 1, wherein the planar body and the sealing element are supported on one another in a form-fitting manner in a force direction parallel to the working surface.

11. The sanding pad of claim 1, wherein the sealing element is detachably arranged on the planar body.

12. The sanding pad of claim 1, wherein the sealing element and the planar body are connected to one another in a form-fitting manner by at least one pairing of a form-fitting projection and a form-fitting receptacle which extend transversely, to the machining surface and interlock.

13. The sanding pad of claim 1, wherein the sealing element has at least one support contour and/or a support rib projecting in front of the sealing element for lateral contact on a rib delimiting a cavity.

14. The sanding pad of claim 13, wherein the sealing element has two support contours and/or welding projections spaced apart from one another, which are provided for contact on opposite ribs delimiting a cavity or delimit a receptacle for engaging a rib.

15. The sanding pad of claim 13, wherein the at least one support contour or the at least one welding projection has at least two support contours or welding projections extending at an angle to one another, for support on ribs angled in relation to one another.

16. The sanding pad of claim 13, wherein the at least one support contour or the at least one welding projection comprises a support frame for lateral contact on an inner circumference of a cavity delimited by ribs of the rib structure.

17. The sanding pad of claim 13, wherein the at least one support contour forms or comprises a welding projection for thermal welding and/or ultrasonic welding of the sealing element to the planar body.

18. The sanding pad of claim 1, further comprising a cover element which covers at least part of the cavities on the machine side.

19. The sanding pad of claim 18, wherein the cover element is held on the planar body in a form-fitting manner and/or by means of the sealing element and/or by means of an adhesive bond and/or is integrally formed or fixedly connected with the sealing element or is formed by the sealing element.

20. The sanding pad of claim 18, wherein the cover element has openings, for form-fitting elements, using which the sealing element and the planar body are fixed on one another in a form-fitting manner, and/or for engaging holding contours of the sealing element and/or for through-flow of dirty air and/or for the drive holder.

21. The sanding pad of claim 1, wherein the sealing element and/or the or a cover element at least partially covering the cavities of the planar body, except for the outflow openings for the dirty air outside and/or inside the suction zone cover all cavities of the planar body on the machine side, which are closed between the machine side and the machining side or to an outer edge of the sanding pad with respect to an outer circumference of the planar body.

22. The sanding pad of claim 1, wherein at least a part of the ribs of the planar body extend radially or radiating away from the drive holder to an edge region of the sanding pad.

23. The sanding pad of claim 1, wherein at least a part of the ribs of the planar body extend to a common support plane, in which the ribs support the sealing element and/or the cover element.

24. The sanding pad of claim 1, wherein the supporting wall of the planar body has recesses on the machining side to form the inflow openings and/or to provide at least partial portions of the through-channels.

25. The sanding pad of claim 1, wherein the machining face of the sanding pad is provided directly by the supporting wall or a cover body having the machining face.

26. The sanding pad of claim 25, wherein the cover body has or is formed by an elastic and/or resilient cushion body and/or the cover body covers the planar body on the machining side completely or except for an edge region which is remote from the drive holder and provided for reaching behind the sanding means and/or through-flow openings for dirty air and/or wherein the cover body has the sanding means or the adhesive layer for the detachable fastening of the sanding means on the sanding pad.

27. The sanding pad of claim 25, wherein the cover body is detachably fastened on the planar body by means of fastening bolts.

28. A cover body for a sanding pad or as part of a sanding pad, wherein the sanding pad comprises a machining side and has a machining face on which a sanding means for abrasive machining of a workpiece can be arranged so as to be fixed or removable using an adhesive layer, wherein inflow openings for dust-laden dirty air to flow in are situated in the machining face, and outflow openings fluidically connected to the inflow openings via through-channels are situated on the machine side; wherein the outflow openings are situated in a suction zone within an annular sealing element that is situated on the machine side for sealingly contacting a counter-sealing element of the sanding machine, wherein the sanding pad comprises a planar body which has a supporting wall provided for supporting the sanding means, which supporting wall is reinforced by a rib structure, the ribs of which project beyond the supporting wall towards the machine side, wherein the ribs delimit cavities which are closed by the supporting wall with respect to the machining side and are open with respect to the machine side, and wherein the sealing element covers at least some of the cavities towards the machine side, wherein the cover body is configured as a cushion and has a supporting wall body and a machining wall body, between which an elastic and/or resilient cushion body is held in a sandwich-like manner, wherein the supporting wall body and the machining wall body have flat sides facing away from one another, of which the flat side of the supporting wall body is provided and configured for contact on one or the planar body of the sanding pad and the flat side of the machining wall body contains a sanding means or an adhesive layer for the detachable fastening of a sanding means, wherein the machining wall body and the supporting wall body are connected to one another by a connecting device on an outer circumference of the cover body, so that the cushion body is protected against mechanical damage by the supporting wall body, the machining wall body, and the connecting device on the outer circumference of the cover body.

29. The cover body of claim 28, wherein the supporting wall body and/or the machining wall body consist of material which is different and/or has higher tensile strength and/or is more impact-resistant and/or denser and/or harder than the cushion body.

30. The cover body of claim 28, wherein the supporting wall body and/or the machining wall body consist of a textile material.

31. The cover body of claim 28, wherein the connecting device comprises a seam or connecting bodies spaced apart from one another or is formed by a seam or connecting bodies spaced apart from one another, wherein the seam or the connecting bodies connect the supporting wall body and the machining wall body to one another, in particular directly.

32. The cover body of claim 28, wherein the connecting device comprises a material bond or is formed by a material bond, wherein the material bond connects the supporting wall body and the machining body to one another.

33. The cover body of claim 28, wherein the connecting device comprises at least one ring body which at least partially encloses the outer circumference of the cover body.

34. The cover body of claim 33, wherein the at least one ring body has at least one peripheral wall portion overlapping the cushion body on the outer circumference of the cover body and/or has at least one leg portion on which a flat side of the supporting wall body or a flat side of the machining wall body or the planar body of the sanding pad is supported.

35. The cover body of claim 33, wherein the at least one ring body clamps the machining wall body to the supporting wall body and/or the planar body and/or comprises ring bodies that are opposite to one another and are connected to one another, and between which the machining wall body and the supporting wall body are held in a sandwich-like manner

36. The cover body of claim 33, wherein the at least one ring body is arranged in a sandwich-like manner between the supporting wall body and the machining wall body or has a section arranged between the supporting wall body and the machining wall body.

37. The cover body of claim 33, wherein the ring body is elastic or has an elastic part and is deformable by a force acting on the machining wall body in the direction of the supporting wall body.

38. The cover body of claim 28, further comprising a large-region central region in which the cushion body is arranged and around which the connecting device extends, and wherein in the central region there is no connection penetrating the cushion body between the machining wall body and the supporting wall body.

39. The cover body of claim 28, wherein the machining wall body has a large-region central region in which the machining wall body projects farther in front of the supporting wall body than on the outer circumference of the cover body.

40. The cover body of claim 28, wherein inflow openings for dirty air are arranged on the flat side of the machining wall body and are connected to outflow openings on the flat side of the supporting wall body via through-channels.

41. The cover body of claim 28, wherein a cavity enclosed by the supporting wall body and the machining wall body is provided between the cushion body and the outer circumference of the cover body.

42. A sanding machine having a drive motor for driving an output and having a sanding pad for fastening on the output, the sanding pad comprising a machining side and has a machining face on which a sanding means for abrasive machining of a workpiece can be arranged so as to be fixed or removable using an adhesive layer, wherein inflow openings for dust-laden dirty air to flow in are situated in the machining face, and outflow openings fluidically connected to the inflow openings via through-channels are situated on the machine side; wherein the outflow openings are situated in a suction zone within an annular sealing element that is situated on the machine side for sealingly contacting a counter-sealing element of the sanding machine, wherein the sanding pad comprises a planar body which has a supporting wall provided for supporting the sanding means, which supporting wall is reinforced by a rib structure, the ribs of which project beyond the supporting wall towards the machine side, wherein the ribs delimit cavities which are closed by the supporting wall with respect to the machining side and are open with respect to the machine side, and wherein, characterized in that the sealing element covers at least some of the cavities towards the machine side and/or having a sanding pad on which a cover body is arranged, the cover body being configured wherein the cover body is configured as a cushion and has a supporting wall body and a machining wall body, between which an elastic and/or resilient cushion body is held in a sandwich-like manner, wherein the supporting wall body and the machining wall body have flat sides facing away from one another, of which the flat side of the supporting wall body is provided and configured for contact on one or the planar body of the sanding pad and the flat side of the machining wall body contains a sanding means or an adhesive layer for the detachable fastening of a sanding means, characterized in that, wherein the machining wall body and the supporting wall body are connected to one another by a connecting device on an outer circumference of the cover body, so that the cushion body is protected against mechanical damage by the supporting wall body, the machining wall body, and the connecting device on the outer circumference of the cover body, wherein the sanding machine has a counter-sealing element for contact on the sanding pad and/or the sealing element of the sanding pad.

43. The sanding machine of claim 42, wherein the counter-sealing element has an elastic ring body made of an elastic material.

44. The sanding machine of claim 43, wherein at least one contact body provided for grinding contact on the sealing element and made of a material that is harder than the elastic material, is embedded in the ring body.

45. The sanding machine of claim 42, further comprising it has an eccentric bearing device for eccentrically driving the sanding pad.

Description

[0118] An exemplary embodiment of the invention is explained hereinafter with reference to the drawing. In the figures:

[0119] FIG. 1 shows a perspective diagonal view of a sanding machine in partial section having a sanding pad which is shown in

[0120] FIG. 2 in an exploded view diagonally from above and in detail enlargements D2, D3, and D4 and in

[0121] FIG. 3 assembled diagonally from above,

[0122] FIG. 4 shows an exploded view of the sanding pad according to the above figures, approximately corresponding to FIG. 2, but diagonally from below and with detail enlargements D5 and D6,

[0123] FIG. 5 shows the sanding pad according to the preceding figures diagonally from below,

[0124] FIG. 6 shows a top view of the sanding pad of the preceding figures frontally from above,

[0125] FIG. 7 shows a partial portion corresponding to a detail D1,

[0126] FIG. 8 shows the partial portion according to detail D1, but along a portion line B-B in FIG. 6 of detail D1,

[0127] FIG. 9 shows an exploded view of the sanding machine in partial section according to FIG. 1 having a sanding pad in a further embodiment,

[0128] FIG. 10 shows the sanding pad according to FIG. 9 diagonally from above,

[0129] FIG. 11 shows an exploded view of the sanding pad according to FIG. 10 diagonally from above,

[0130] FIG. 12 shows an exploded view of the sanding pad according to FIGS. 10, 11 diagonally from below,

[0131] FIG. 13 shows an alternative sealing element for the sanding pad according to FIGS. 9-12,

[0132] FIG. 14 shows a section along a section line C-C through the sanding pad according to FIG. 10,

[0133] FIG. 15 shows a section along a section line D-D through the sanding pad according to FIG. 10,

[0134] FIG. 16 shows a variant of the sanding pad according to the preceding figures, but with a cover element which is reinforced at the edge by a reinforcing device in a first embodiment,

[0135] FIG. 17 shows the sanding pad and in particular the cover body according to FIG. 16 diagonally from below,

[0136] FIG. 18 shows a detail D7 from FIG. 17,

[0137] FIG. 19 shows a variant of the sanding pad according to FIG. 16 having a smaller cushion body, approximately corresponding to a detail D8 in FIG. 16,

[0138] FIG. 20 shows a further cover body, a variant of a sanding pad, and a cover body having a ring body as the connecting device,

[0139] FIG. 21 shows a portion through the sanding pad according to FIG. 20, approximately corresponding to detail D8 in FIG. 16,

[0140] FIG. 22 shows the sanding pad according to FIG. 20 diagonally from above, but having an alternative ring body,

[0141] FIG. 23 shows a partial portion through an edge region of the sanding pad according to FIG. 22, approximately corresponding to detail D8,

[0142] FIG. 24 shows a further sanding pad and a further cover body having an edge-side adhesive bond or weld of the cover body,

[0143] FIG. 25 shows a detail of the sanding pad and cover body according to FIG. 24, approximately corresponding to detail D8,

[0144] FIG. 26 shows a further sanding pad and cover body having a stamped and bent part as a ring body and connecting device, of which in

[0145] FIG. 27 a detailed portion approximately corresponding to detail D8 is shown,

[0146] FIG. 28 shows a further sanding pad and cover body diagonally from below, of which in

[0147] FIG. 29 a detail portion, for example detail D8 is shown,

[0148] FIG. 30 shows a further sanding pad and cover body diagonally from below having an elastic edge protection, which is shown in detail in

[0149] FIG. 31 as a portional view (approximately corresponding to detail D8).

[0150] A sanding machine 15 is used for sanding a workpiece surface, for example, a wall surface of a space, a mobile workpiece W, or the like. The sanding machine 15 can be gripped at a handle 16 which, in contrast to the drawing, can be connected to a machine housing 20 of the sanding machine 15 fixedly or, as shown in the drawing, movably by means of a joint 17. The handle 16 can be an integral part of the machine body 20 and can protrude fixedly therefrom, in contrast to what is shown in the drawing. The handle 16, which is in particular rod-shaped, allows the sanding machine 15 to be guided along the remote workpiece surfaces, for example along ceilings or side walls of a room.

[0151] A drive motor 25 is accommodated in a motor portion 21 of the machine housing 20, for example an electronically commutated motor, a universal motor, or the like. An output 26 of the drive motor 25 drives an eccentric bearing device 27 which supports a tool shaft 28 in a rotatable manner, namely by means of one or more pivot bearings. The bearing device 27 has a tool holder 29 on which a sanding pad 40 can be detachably fastened using its drive holder 49. The drive holder 49 and the tool holder 29 have, for example, corresponding screw contours, bayonet contours, or similar other fastening means for detachable fastening. The tool shaft 28 has an eccentricity to a shaft of the drive motor 25 (not shown in more detail in the drawing), on which the output 26 is arranged, i.e., an axis of rotation E of the tool holder 29 is eccentric to an axis of rotation M of the drive motor 25. Therefore, a rotational but eccentric sanding movement or drive movement can be generated by the drive train of the sanding machine 25. Of course, this eccentricity is only one embodiment, i.e., the sanding machine 25 could in principle also drive the sanding pad 50 without such an eccentricity, for example if the tool holder 29 were arranged directly on the output 26 of the drive motor 25.

[0152] The sanding pad 40 is arranged within a protective body 23 which is designed, for example, in the manner of an suction hood or protective hood. The protective body 23 is held by a tool portion 22 of the motor housing 20 arranged on the motor portion 21 or is integral with it.

[0153] A machining face 45 of the sanding pad 40 projects in front of the protective body 23, i.e., in front of its edge 24 oriented or projecting towards the machining face 45.

[0154] An suction device 30 is used to extract dust that is produced when using the sanding machine 15 or the sanding pad 40, namely in that particles are removed from the workpiece W. The suction device 30 is arranged on the tool portion 22, for example. The suction device 30 has an suction fitting 31 to which a hose 12 of an suction device 11, for example a vacuum cleaner, is connectable. The suction device 11 generates a suction flow so that dirty air S can be extracted from the region of the machining surface 45. Of course, an suction device or a flow generator could also be provided directly on the sanding machine 15, in particular a fan wheel or the like. This can be drivable, for example, by the drive motor 25 or a separate drive motor.

[0155] The suction fitting 31 is fluidically connected to an suction chamber 32 which extends around the tool holder 29. If a machine side 41 of the sanding pad 40 is subjected to negative pressure or extracted, the outflow openings 43 for the dirty air S that are present there and are located in the suction chamber 32 are subjected to negative pressure.

[0156] Ambient air L furthermore flows from the outside around the sanding pad 40, for example through a gap 34 between the protective body 23, the suction hood, and the sanding pad 40 and/or through through-flow openings 33 of the protective body 23.

[0157] The through-flow openings 33 are provided on an edge region 47 of the sanding pad 40. An suction zone 44 in the center of the sanding pad 40, i.e., an suction zone that extends around the drive holder 49, is delimited by a sealing arrangement 35, which also encloses or houses the suction chamber 32.

[0158] The sealing arrangement 35 comprises a counter-sealing element 36 of the sanding machine 15 which, when the sanding pad 40 is mounted on the sanding machine 15, bears against a sealing element 80 of the sanding pad 40 to form a seal. The counter-sealing element 36 comprises, for example, an elastic ring body 37, in particular a type of sealing collar. The ring body consists for example of elastic plastic, rubber, or the like. The counter-sealing element 36 can have displacement contours, beads, or the like so that it is deformable relative to the substantially rigid or non-elastic sealing element 80.

[0159] To reduce wear of the counter-sealing element 36, contact bodies 38 are embedded in the ring body 37 and slide along the sealing element 80 of the sanding pad 40. The contact bodies 38 are made of a harder material than the ring body 37 and comprise, for example, metal pins.

[0160] The machining surface 45 of the sanding pad 40 is arranged on its machining side 42. Inflow openings 48 for the inflow of dirty air S are also located there. The inflow openings 48 communicate with through-channels 59 of the sanding pad 40, which are fluidically connected to the outflow openings 43.

[0161] The sealing element 80 extends around the suction zone 44 on the machine side 41. The outflow openings 43, which open into the suction chamber 32, so to speak, are arranged in the interior of the suction zone 44. The sealing element 80 thus annularly encloses the suction zone 44. An outer zone 46 is provided radially on the outside with respect to the drive holder 49, i.e., between the edge region 47 or the outer circumference of the sanding pad 40 and the sealing element 80, which is closed off towards the machine side 41, namely by a cover element 70. Only radially on the outside with respect to the drive holder 49, the in the edge region 47, a rib structure 45 of the sanding pad 40 is open, but not to the side 41, but also to the outer edge of the sanding pad 40, so that no dust deposits or the like are to be feared there.

[0162] The sanding pad 40 experiences its rigidity essentially due to the planar body 50, which is essentially rigid. For example, the planar body 50 consists of metal, of a thermosetting plastic, or the like. In addition, the planar body 50 is reinforced by the rib structure 45.

[0163] The planar body 50 is provided on its machine side 51 with a plurality of cavities 57 which are located between ribs 56 of the rib structure 55. The cavities 57 result essentially due to the demolding of the planar body 50 in the context of a casting process, for example when a casting core GK (shown schematically in FIG. 3) is removed from a respective cavity 57. Intermediate spaces between the ribs 56, therefore cavities 57, are thus open, while sections of a supporting wall 54 extend between the ribs 56 on the machining side 52 of the planar body 50.

[0164] At this point, however, it is to be mentioned that the supporting wall 54 has a plurality of recesses 59A, which communicate with the inflow openings of the sanding pad 40 or form them. portions of the recesses 59A can be represented by inflow openings 58, for example. The through-channels 59 communicate with outflow openings 53 on the machine side of the planar body 50 so that dirty air flowing into the recesses 59A and the inflow openings 58 can flow through the through-channels 59 to the outflow openings 53.

[0165] Insofar as the planar body 50 is open on its machining side 52 due to the recesses 59A, it is in any case closed or covered by a cover body 560.

[0166] The cover body 560 is arranged with its machine side 61 on the machining side 52 of the planar body 50, for example adhesively bonded to the planar body 50, connected in a form-fitting manner (not shown), or the like.

[0167] The cover body 560 has a plate-like shape. The cover body 560 has, for example, through-flow openings 63 which are fluidically connected to the inflow openings 58 of the planar body 50 or communicate with them. Furthermore, a passage opening 569 is provided on the cover body 560 in the region of the drive holder 49, so that, for example, a fastening screw or the like, using which the sanding pad 40 is connectable to the tool holder 29, is actuatable.

[0168] On its machining side 62, the cover body 560 preferably has an adhesive layer 66, for example a hook-and-loop layer, an adhesive layer, or the like, for a sanding means 90, in particular an abrasive sheet 90A. Of course, instead of the adhesive layer 66, a sanding means, for example a grit, a sanding means fabric, or the like, could be arranged directly.

[0169] The planar body 50 is essentially covered by a cover element 70 on the machine side 51.

[0170] The cover element 70 extends into the outer zone 46 and covers the rib structure 55 there towards the machine side. Thus, no dust or any other undesirable material can penetrate into the cavities 57 of the outer zone 46. The cover element 70 also essentially covers the cavities 57 of the rib structure 55 radially on the inside with respect to the sealing element 80.

[0171] A machining side 72 of the cover element 70 rests on the ribs 56 and can, for example, be adhesively bonded and/or welded to them, for example thermally welded.

[0172] In the exemplary embodiment, the cover element 70 is held in a form-fitting manner on the planar body 50, namely by the sealing element 80. Thus, for example, through-flow openings 73 of the cover element 70 are aligned with the outflow openings 53 of the planar body 50, so that they can represent the outflow openings 43 of the sanding pad 40. This is because the cover element 70 is not only provided in the region of the outer zone 46 to cover part of the cavities 57, but also in the suction zone 44. There the cover element 70 covers all the cavities 57 of the rib structure 55, except for the outflow openings 53 and the drive holder 49, for which through-flow opening 73 or passage openings 79, respectively, are provided.

[0173] The cover element 70 has further passage openings 78, namely for holding projections 89 and thus holding contours 88 which engage in the holding receptacles or passage openings 78 in a form-fitting manner For example, the holding projections 85 are polygonal or are provided in some other way with an anti-twist contour on their outer circumference, i.e., around their respective plug axis along which they are pluggable into the holding receptacles 78.

[0174] The sealing element 80 has a sealing body 83A which has a passage opening 83 and thus has an annular shape. The inner peripheral contour of the sealing body 83A delimiting the passage opening 83 delimits the suction zone 44. On the sealing body 83A, which is wall-like or plate-like, for example, a sealing surface 83B is provided on the machine side 81 of the sealing element 80, against which the counter-sealing element 36 can bear to form a seal, i.e, for example, can rub along.

[0175] The holding projections 89 penetrate the holding receptacles 78 or passage openings of the holding element 70 and protrude freely into the cavities 57. Of course, plug receptacles or similar other form-fitting holding contours could also be provided for the holding projections 89, so that the sealing element 80 can be fastened directly to the planar body 50 in a form-fitting manner by means of the holding projections 89. Such a form-fitting support enables, for example, support against a direction of force F, which extends parallel to the machining surface 45. Thus, for example, a torque generated by the sealing elements 36 and 80 rubbing against one another is supported on the planar body 50.

[0176] The sealing element 80 is connected in a form-fitting manner, namely latched, directly to the planar body 50 using latching means 84. The latching means 84 include form-fitting projections 85 which protrude towards the machining side 82 of the sealing element 80 and engage in a form-fitting manner in form-fitting receptacles 95 of the planar body 50. The form-fitting projections 85 and the form-fitting receptacles 95 are, for example, plug projections and plug receptacles.

[0177] The form-fitting projections 85 could engage in the form-fitting receptacles 95, for example with a press fit, which results, for example, in that the form-fitting projections 85 have slots 85C, 85D, so that plug segments 85A, 85B are formed, which are relatively movable toward one another and away from one another transversely to a plug axis SA. In particular, such a press fit is provided on lateral support surfaces 98 of the form-fitting receptacle 95, using which the respective form-fitting projection 85 for supporting the force F is supported on the form-fitting receptacle 95. The support surfaces 98 support, for example, a base region of a respective form-fitting projection 85, using which it is connected to the sealing body 83A.

[0178] The form-fitting projections 85 are configured, for example, like holding pins that engage in the holding receptacles or form-fitting receptacles 95.

[0179] Rear gripping surfaces 97 are provided counter to a plug axis direction, along which the form-fitting projections 85 are inserted into the form-fitting receptacles 95. The rear gripping surfaces 97 are located in an expanded section 96 of a respective form-fitting receptacle 95, into which a head region 86 of a respective form-fitting projection 86 engages. The head region 86 also has rear gripping surfaces 87 which protrude transversely to the plug axis SA in front of the base region or base section of a respective form-fitting projection 85. The form-fitting projections 85 are thus supported in a form-fitting manner in the form-fitting receptacles 95 in the direction of a removal of the sealing element 80 from the planar body 50. When the form-fitting projection 85 is inserted into the form-fitting receptacle 95, the plug segments 85A, 85B are displaced toward one another in the direction of the slots 85C, 85D or in the direction of a narrowing of the slots 85C, 85D, so that the head regions 86 can reach the widened portion 96 of the form-fitting receptacle 95 past the support surfaces 98 and latch there with the form-fitting receptacle 95.

[0180] The slots 85C, 85D extend, for example, in a cross shape and/or at an angle to one another.

[0181] Additionally or alternatively to the latching means 84, an adhesive bond of the sealing element 80 to the planar body 50 can also be provided.

[0182] Alternatively, it is also possible, for example, for form-fitting projections to protrude from the planar body and engage in form-fitting receptacles of a sealing element. Therefore, for example, projections could be provided on the planar body 50 which engage in form-fitting receptacles, which are provided instead of the form-fitting projections 85, of the sealing element 80.

[0183] The form-fitting projections 85 are arranged at angular intervals, preferably equal or equidistant angular intervals, on the sealing element 80 and protrude toward the machining side 82 of this element. The form-fitting projections 85 penetrate passage openings 75 of the cover element 70 so that this is held in a sandwich-like manner between the sealing element 80 and the planar body 50.

[0184] The holding contours 88 or holding projections 89 form additional holding elements which fix the cover element 70 with respect to the planar body 50. The holding projections 89 are, for example, likewise arranged at angular intervals from one another, in particular at regular angular intervals from one another. It can be provided that a holding projection 89 is provided next to or on each, preferably only every second, form-fitting projection 85.

[0185] Instead of the cover body 560, on which a sanding means in the form of the abrasive sheet 90A can be arranged directly, a cover body 60 can also be provided.

[0186] The cover body 60 is fastened to the planar body 50 with a machine side 61, for example adhesively bonded thereon or connected detachably to it, which will become even clearer hereinafter. For example, a supporting wall body 64 of the cover body 60 bears against the planar body 50.

[0187] On a machining side 62 opposite to the machine side 61, the cover body 60 has a machining wall body 65, which is used to fasten and support the sanding means 90, in particular the sanding means 90A. An adhesive layer 66 is arranged on the machining wall body 65, for example, which can be connected to the adhesive layer 94 of the sanding means 90, for example in the manner of a hook-and-loop connection.

[0188] A cushion body 67 made of a foam material or other elastic material is arranged between the supporting wall body 64 and the machining wall body 65, so that the machining side 62 or the machining wall body 65 can deform with deformation of the cushion body 67 in the direction of the machining side 52 of the planar body 50 in order to conform to contours of the workpiece W.

[0189] The supporting wall body 64 and the machining wall body 65 have flat sides 64F, 65F facing away from each other, of which the flat side 64F of the supporting wall body 64 is provided and configured for contact on the planar body 50 of the sanding pad 60, 160 and the flat side 65F of the machining wall body 65 has the adhesive layer 66

[0190] The cover body 60 has through-flow openings 63 which, when the cover body 60 is mounted on the planar body 50, are aligned with the inflow openings 58, so that dirty air S, which flows through the through-flow openings 93 of the sanding means 90 into the cover body 60, flows into the inflow openings 63E of the cover body 60 and through through-flow openings 63, can flow out of outflow openings 63A of the cover body 60 and can furthermore flow through the planar body 50.

[0191] Instead of the adhesive layer 66, a sanding means, for example an abrasive fabric, a grit material, or the like, could readily be arranged directly on the cover body 60 or 560.

[0192] The cover body 60 is adhesively bonded on the planar body 50, for example.

[0193] On the other hand, the cover body 60 is advantageously releasably fastenable on a planar body 150 of a sanding pad 140, namely, for example, by means of screws 68B that are inserted through passage openings 68 in the cover body 160 and screwed into screw receptacles 68D of the planar body 150 that are arranged on its machining side 52. The screws 68B have screw heads 68C, which are supported on the machining side 62 of the cover body 60, which is configured as a flat side. Contrary to what is shown in the drawing, but as indicated by dash-dotted lines in FIG. 14, the screw heads 68C plunge into the machining side 52 or the machining wall body 65 in such a way that troughs are formed therein which the screw heads 68C are accommodated, and a substantially flat surface 62B results on the machining side 62. To form such troughs, slots 68A extend from the passage openings 68, for example in a star shape, which enable or facilitate a deformation or trough formation of the cover body 60 in the region of the screw heads 68C.

[0194] The sanding pad 160 has the above-mentioned planar body 150, which has a machine side 51 on which a drive holder 149 is provided. The drive holder 149 is used to fasten a tool holder 129, which has certain differences from the tool holder 59, but also has an eccentric bearing device 27. Holding projections 29A are provided on its outer circumference, on which screw receptacles 29B are arranged. The holding projections 29A are preferably accommodated in the drive holder 149 in a form-fitting manner, for example by means of matching receptacle contours. However, this is not absolutely necessary, namely because screws 29C are provided which penetrate passage openings 29D of the planar body 150 and are screwed into the screw receptacles 29B.

[0195] The planar body 150 is constructed similarly to the planar body 50, i.e., it has a supporting wall 54 and inflow openings 58 on its machining side, which are fluidically connected via through-channels 59 to outflow openings 53 of a machine side 51 of the planar body 150. A rib structure 155 stiffens and supports the supporting wall 54 and is open toward the machine side 51, i.e., cavities 57 are present between ribs 156 of the rib structure 155. These cavities 57 are also covered on the machine side 51 in the case of the planar body 150 and thus the sanding pad 140, so that dust and similar other undesirable material does not penetrate into the cavities 57.

[0196] The sanding pad 160 has a sealing element 180 which is integrally enclosed by cover element 170. A machine side 81 of the sealing element 80 is used to ensure that the elastic ring body 37 and/or the counter-sealing element 36 bears against it to form a seal. An annular sealing surface 83B is provided on a sealing body 83A of the sealing element 180 for sealing contact of the counter-sealing element 36 and extends around a passage opening 83 of the sealing element 180. The cover element 170 is arranged radially on the outside on the sealing element 180, which annularly encloses the sealing element 180 with a ring body 174, which has an annular shape.

[0197] The sealing element 180 is connected to the planar body 150 by means of a weld and essentially covers its cavities 57, except for rib structures which are open radially outwards with respect to the sanding pad 140.

[0198] Both the sealing element 180 and the cover element 170 are plate-shaped. The sealing element 180 protrudes in front of the cover element 170 in a direction away from the planar body 150. Holding contours 188 can be provided on the sealing element 180, for example holding projections, which engage in the planar body 150, for example are supported on the ribs 156 of its rib structure 155.

[0199] Furthermore, form-fitting contours are advantageously provided on the machine side 51 of the planar body 150 and the machining side 82 of the sealing element 180 which advantageously and/or at least during an assembly process and/or welding process of the two components interlock in a form-fitting manner and hold the two components relative to each other, so that the welding described hereinafter succeeds with optimal accuracy. For example, form-fitting projections 158A are provided on the machine side 51 of the planar body 150, for example in the form of centering projections or centering pins, which engage in form-fitting receptacles 178 of the cover element 170. The pairs of form-fitting receptacle 170 and form-fitting projections 158A are provided at angular intervals with respect to the axis of rotation or central axis of the sanding pad 140.

[0200] Welding projections 185 are provided on the machining side 82 of the sealing element 180 and on the machining side 72 of the cover element 170, i.e. on the same side of both components, which projections are supported on the ribs 156 and are connected to them by means of ultrasonic welding. The welding projections 185 extend partially annularly around the outflow openings 53 of the planar body 50 and to this extent close through-channels 59 via which inflowing dirty air can flow via the inflow openings 58 on the machining side 52 of the planar body 50. The course of the welding projections 185 is adapted to the course of the ribs 156 and has, for example, portions 185A extending approximately parallel to the outer circumference of the drive holder 149, from which portions 185B extend away in the direction of the drive holder 149 and up to it.

[0201] The sealing element 180 thus covers or seals the radially inner region of the machine side 51 of the planar body 150 surrounding the drive holder 159 and is welded to this region. The cavities 57 are covered radially on the outside by the cover element 170, which rests tightly on the end faces of the ribs 156, but is not or not completely welded to them. However, welding projections 177, for example punctiform welding projections, are provided radially on the outside with respect to the axis of rotation of the sanding pad 140 on the machining side 72 of the cover element 170 and are welded to the material of the planar body 150. For example, multiple welding projections 177 are provided arranged adjacent to one another at angular intervals in the circumferential direction with respect to the axis of rotation of the sanding pad 140. The welding projections 177 are arranged on the radially outer edge region of the cover element 170 with respect to the axis of rotation of the sanding pad 140.

[0202] Multiple, for example four, welding projections 177 form a welding projection group, for example. Between the welding projection groups of welding projections 177, there are preferably angular intervals in which no welding projections are provided. The welding projections 177 preferably form multiple row arrangements.

[0203] In the example of a sealing element 180A, which in principle corresponds to the sealing element 180 including the cover element 170 arranged thereon, there are welding projections which have a linear shape and also enable optimal welding to the planar body 150 in the region of the cover element 170. For example, peripheral welding projections 185D extending on the outer circumference of the cover element 170 are provided. Annular welding projections 185E also extend, for example, around the screw receptacles 86D. Furthermore, further welding projections 185C extend radially outwards in a star shape in the region of the cover element 170. Overall, the welding projections of the sealing element 180 basically form a rib-like shape which is, so to speak, complementary to the rib structure 155 and thus comes to rest on or adjacent to the end faces of the ribs 156. With a correspondingly powerful welding system, for example at 20 kilowatts and more, elongated welding projections and a large number of welding projections, as in the case of the sealing element 180A, can also be welded using ultrasound.

[0204] The cushion body 67 of the cover body 60 is exposed on the outer circumference 69 of the cover body 60. As a result, for example, it is not protected against damage if the sanding pad 140 hits an obstacle.

[0205] To remedy this problem, alternative covering bodies 60A, 60B, 60C, 60D, 60E, 60F, 60G are provided to cover body 60, on the outer circumference 69 of which a connecting device 100A, 100B, 100C, 100D, 100E, 100F, 100G is provided. The connecting device 100A-100G protects the respective outer circumference 69 against damage, namely in that the cushion body 67 is protected by the connecting device 100A-100G, which may also be referred to hereinafter as the connecting device 100 for the sake of simplicity. The basic structure of the covering bodies 60A, 60B, 60C, 60D, 60E, 60F, 60G corresponds to the cover body 60, i.e., they have supporting wall bodies 64 and machining wall bodies 65, between which a cushion body 67 is accommodated in a sandwich-like manner in each case.

[0206] For example, a seam 101 is provided in the cover body 60A, which directly connects the supporting wall body 64 and the machining wall body 65 to one another. The seam 101 is preferably configured as a zigzag seam. It is particularly advantageous if the seam 101 is configured as a type of edge.

[0207] The supporting wall body 64 and/or the machining wall body 65 consists, for example, of rubber, cloth, composite materials, or the like.

[0208] The supporting wall body 64 and the machining wall body 65 are, so to speak, connected to one another at the edge by the connecting device 100A. One advantageous effect is that the connecting device 100A, in particular the seam 101, forms a peripheral part 69B on the outer circumference 69, in which or on which the wall bodies 64 and 65 are arranged directly adjacent to one another and are fixedly connected to one another. Proceeding from this, an inclined part 69A of the outer circumference 69 extends to a flat or essentially flat fastening plane 69C, which is provided for fastening the sanding means 90. The inclined part 69A extends obliquely with respect to the fastening plane 69C.

[0209] The fastening plane 69C is preferably a flat plane in front of which the heads of the screws 68B do not protrude, namely by plunging into the slots 68A or troughs of the cushion body 67.

[0210] Alternatively or additionally to the seam 101, a material connection 101A, for example welding, adhesive bonding, etc., is also possible. In all of these cases, the wall bodies 64 and 65 are connected directly to one another, so that the cushion body 67 is enclosed on the outer circumference 69 and is not freestanding.

[0211] In order to be able to form the inclined part 69A better, a cavity 67A is provided between the cushion body 67 and the outer circumference 69, for example. This is the case, for example, in a cover body 60A2.

[0212] Advantageously, the fastening plane 69C and/or thus a middle or central region or central region 69Z or the largest surface extension of the machining side 62 of the cover body 60A is configured in such a way that there is no connection penetrating the cushion body 67 and the supporting wall body 64 and the machining wall body 65 there, for example, no part of the connecting device 100, i.e., for example no seam, no material bond, or the like. Although this would be possible in principle, under certain circumstances it would have the result that the fastening plane 69C would have troughs or similar other indentations.

[0213] In the case of a connecting device 100B, a ring body 102 is provided which, so to speak, encloses the supporting wall body 64, the machining wall body 65, and also the supporting wall 54. The ring body 102 has, for example, a peripheral wall portion 102A from which leg portions 102B, 102C project at an angle, for example at right angles. A U-shaped receptacle is thereby formed, in which a peripheral part 65A of the machining wall body 65 as well as a peripheral part 64A of the supporting wall body 64 are accommodated.

[0214] The ring body 102 preferably has a slot or clamp opening 102D so that it is installable like a clamp around the outer circumference of the sanding pad 140, enclosing the planar body 150 and the cover body 60B.

[0215] A connecting device 100C has a similar concept as the connecting device 100B, wherein in contrast to the ring body 102, a ring body 103 only clamps the supporting wall body 64 and the machining wall body 65 together, so to speak. The ring body 103A has a peripheral wall portion 103 from which leg portions 103B and 103C project at an angle, so that a receptacle is thus formed in which the peripheral parts 65A of the supporting wall body 64 and the machining wall body 65 are accommodated.

[0216] Like the ring body 102, the ring body 103 also has a slot or clamp opening 103D so that it can be arranged on the cover body 60C enclosing it like a clamp. In doing so, it engages, for example, in a depression or peripheral receptacle 54A of a planar body 150C, which is arranged on the outer circumference of its supporting wall 54 and/or is open radially outwards. Otherwise, the planar body 150C corresponds to the planar body 150.

[0217] However, the planar body 150C is also suitable for a connecting device 100D which has a two-part ring body 104, so to speak. This is configured, for example, as a stamped and bent part. A ring element 104A and a ring element 104B are, for example, welded to one another and/or adhesively bonded to one another, for example in the region of a peripheral part 104E of the ring element 104A. A peripheral wall portion 104C extends from this peripheral part 104E in a direction away from the ring element 104B, while a leg 104B in turn lies opposite the ring element 104B, so that between these two latter components there is a receptacle into which the peripheral wall parts 64A and 65A engage or in which they are accommodated.

[0218] An alternative concept to this is implemented in a connecting device 100E, the ring body 105 of which has ring elements 105B and 105C, which accommodate the peripheral parts 64A and 65A in a sandwich-like manner and connect them to one another. The ring elements 105B and 105C are, for example, annular, in particular circularly annular, plate bodies or wall bodies which face toward one another with their end faces or flat sides, wherein the peripheral part 65A of the machining wall body 65 and the one peripheral part 64A of the supporting wall body 64 are accommodated between the end faces or flat sides.

[0219] For example, the ring elements 105B and 105C are connected to one another by connecting bodies 105A, e.g., rivets, screws, or the like, which penetrate both the ring elements 105B and 105C and also the supporting wall body 64 and the machining wall body 65 and thus fixedly connect all components to one another. As a result, the cover body 60E is compacted at its outer periphery 69 and is hard and advantageously impact-resistant. However, it would also be conceivable that the ring elements 105B and/or 105C are not provided, wherein then the connecting bodies 105A connect peripheral parts 64A and 65A directly to one another. It can be provided that only one of the ring elements 105B and/or 105C is present.

[0220] However, a relatively soft outer circumference of the cover element 60F also offers optimal protection for the cushion body 67. For example, a ring body 106 of the connecting device 105 is made of an elastic material, e.g., plastic, rubber, or the like. The ring body 106 has a peripheral wall 106A, which preferably has wall parts 106B which are movable relative to one another. For example, the wall parts 106B are aligned in a V-shape or are in a V-shape relative to one another. Wall portions 106C and 106D extend away from the peripheral wall 106A and are connected to the supporting wall body 64 and the peripheral wall body 65, for example by material bonding, adhesive bonding, or the like. wall po

[0221] Furthermore, a part 106E of the ring body 106 engages in the above-explained receptacle 64A of the planar body 150C. It is advantageous if the planar body 150C having the supporting wall 64 protrudes approximately up to the peripheral wall portions 106D and 106C, so that it can implement additional mechanical protection for the cushion body 67.

[0222] However, a material which is more wear-resistant than the cushion body 67 but which is nevertheless flexible and is accommodated between the wall bodies 64 and 65 can also represent a connecting device, as is the case with the connecting device 100G. There, for example, a ring body 107 is formed from a foam material which is more wear-resistant than the foam material of the cushion body 67, for example harder, and/or more closed cell or the like. The ring body 107 extends to the outer circumference 69, where it is frontally open, i.e., is not covered by the supporting wall body 64 or the machining wall body 65, for example. However, since the ring body 107 is more mechanically resilient than the cushion body 67, it is less sensitive to impact loads than the cushion body 67. A thickness of the ring body 107 is advantageously selected so that it is less than a thickness of the cushion body 67, wherein the thickness represents the distance between the supporting wall body 64 and the machining wall body 65. Thus, from the central region or main surface region of the cover body 60G, an inclined part 69A extends to a peripheral part 69B which is set back in relation to the central portion.

[0223] It can be seen that the supporting wall body 64 is not necessary in all cases. For example, it would be possible that in the exemplary embodiment of the cover body 60C, there is no supporting wall body 64, wherein then the ring body 103 connects the machining wall body 65 directly to the supporting wall 54, so that the cushion body 67 is enclosed between the supporting wall 54 and the machining wall body 65. In this case, the ring body 103 provides sufficient protection on the outer circumference 69.

[0224] Such a procedure is also possible in the other exemplary embodiments, i.e., there is no supporting wall body. For example, in the exemplary embodiment of the cover body 60A, the machining wall body 65 can be connected directly to the planar body 50, i.e., the supporting wall 54, at the outer circumference 69, for example, by a seam, a weld, or the like.