Dust suction device for a cut-off grinder

Abstract

The invention relates to a dust extraction device for a power tool (12), comprising a hood (1) having a cavity (2) bounded by a rear wall (3), a narrow wall (52) and a working opening (4) and a suction nozzle (5), a shaft extension piece (7) which projects into the cavity (2) with an output end (8) to which a circular disc-shaped processing tool (9) can be attached, which is rotatably attached to the rear wall (3) by a rotary bearing (10) and which has a drive end (11) to which an output shaft (13) of the power tool (12) can be attached, and a rotation-locking element (14) which can be attached to the power tool (12) to fix the hood (1) to the power tool (12) in a rotationally fixed manner.By having the rotary bearing (10) at such a distance from the working opening (4) that a circular segment (9') of the machining tool (9) protrudes outwards through the working opening (4), the dust extraction device is usable for an angle grinder.

Description

field of technology

[0001] The invention relates to a dust extraction device for a power tool, comprising a hood with a cavity bounded by a rear wall, a narrow wall and a working opening and a suction nozzle, with a shaft extension piece which projects into the cavity with an output end to which a circular disc-shaped processing tool can be attached, which is rotatably attached to the rear wall by means of a rotary bearing and which has an output end to which an output shaft of the power tool can be attached, and with a rotation-locking element which can be attached to the power tool in order to fix the hood to the power tool in a rotationally fixed manner. State of the art

[0002] US 2014 / 0271013 A1 describes an angle grinder with a hood covering the grinding wheel, wherein the grinding wheel is connected to an output shaft of the angle grinder by means of an extension piece.

[0003] JP 6684006 B1 describes an angle grinder with a cup-shaped dust extraction hood, which is secured against rotation by a rod attached to the head of the angle grinder. A hood-like body has a back panel to which a swivel bearing is attached, in which a shaft extension is inserted. An output end of the shaft extension projects into the bell-shaped housing. The output shaft of an angle grinder can be attached to a drive end of the shaft extension. A cup grinding wheel can be attached to the output end, protruding through a working opening opposite the back panel.

[0004] A dust extraction hood for a cutting disc is known from US patent 2003 / 0224707 A1.

[0005] EP 2 479 001 B1 describes a similar device with a housing in which a cup grinding wheel can rotate.

[0006] A device for milling grooves or shadow gaps is described in DE 37 22 818 A1. A milling disc is located in a housing and can be driven by an angle grinder. The angle grinder is attached to the housing by a locking device.

[0007] US 2003 / 0224707 A1 describes a dust extraction hood that can be attached as an accessory to an angle grinder.

[0008] US Patent 4,060,940 A describes an angle grinder with a guard that is rotatably attached to the machine housing relative to the drive axis of the grinding wheel. This is achieved by means of an angled metal strip and a fastening screw that engages in an arc-shaped slot in the guard.

[0009] A bellows is known from DE 102006052528 A1.

[0010] EP 1714735 A1 describes a hand drill with a dust extraction device which has a bellows through which the drill protrudes and which has an opening which can be supported on the workpiece. Summary of the invention

[0011] The invention is based on the objective of further developing a dust extraction device in which the hood can be attached to the power tool with a handle fastening screw of the power tool using a rotating locking element, in a way that is advantageous for use.

[0012] The problem is solved by the invention specified in claim 1. Preferred embodiments are defined in the dependent claims.

[0013] It is proposed that an angled metal strip has a first leg which is attached to the hood by a fastening element engaging in an arcuate slot in the rear wall, and a second leg for the passage of the handle fastening screw. According to the invention, the first leg is shorter than the second leg. The arcuate slot can extend around an axis of rotation about which a cutting disc or the like can rotate. The fastening element is preferably a fastening screw whose head has a square section with which the fastening screw is held in the arcuate slot in a rotationally fixed manner.

[0014] One object of the invention, namely to further develop a dust extraction device for a power tool in such a way as to make it more advantageous for use with cutting discs or the like, is achieved by positioning the rotary bearing at such a distance from the working opening that a segment of the processing tool projects outwards through the working opening. The working opening extends at a radial distance from the axis of rotation formed by the shaft extension piece. The housing has a rear wall that supports the rotary bearing. The housing forms a narrow wall that surrounds the outer edge of the processing tool over a circumferential angle of more than 180 degrees. The working opening is formed by the narrow wall. A front wall may be located opposite the rear wall, which only slightly covers one side surface of the processing tool.The cover can be made of plastic, sheet metal, or a metal casting and is, in particular, connectable to the power tool by means of an angled, flat metal strip, so that the cover is rotationally fixed to the power tool housing. According to the invention, the anti-rotation element formed by the metal strip is connected to the rear wall of the cover and, on the other hand, to the power tool by means of a screw that otherwise secures a handle to the power tool housing. The anti-rotation element has a short leg that is attached to the cover. For this purpose, the cover has an arc-shaped slot through which a fastening element, for example, the shank of a fastening screw, protrudes. The short leg can have an opening through which the shank of the fastening screw protrudes, onto which a nut can be screwed.The long leg has an elongated hole through which the aforementioned handle mounting screw can pass. The rotary bearing can be arranged in a bearing flange that projects from the rear wall away from the cavity in which the machining tool can rotate. According to the invention, a shaft cover is provided. The shaft cover is attached to the rear wall of the hood and, in particular, to the bearing flange. The axial length of the shaft cover is selected such that an opening in the shaft cover, which can be supported against a flange surface of the power tool surrounding the output shaft or can be attached to a flange of the power tool, is spaced axially from the drive end of the shaft extension.Between the opening of the shaft cover and the output end is a clearance into which an output shaft of the power tool can protrude and be connected to the output end of the shaft extension piece in a rotationally fixed manner. To enable the dust extraction device to be used with various power tools, particularly angle grinders, the shaft cover is axially adjustable in length. The shaft cover is preferably made of an elastic, particularly rubber-elastic, material and is designed as a bellows.In a relaxed state, where the dust extraction device is not connected to the power tool, the shaft cover extends axially beyond the free end of the drive end, leaving a gap between an opening in the shaft cover and the free end of the drive end of the shaft extension. When the shaft extension is coupled to the output shaft of the power tool, the output shaft can enter this gap. The output shaft may have a thread at its free end that can be screwed into an internal thread of the drive end. The shaft extension is preferably rotatably but axially fixed in the rotary bearing. The output end of the shaft extension may have a step against which the edge of a mounting opening of a cutting disc forming the cutting tool can rest.A threaded section of the output shaft can protrude through the mounting opening, onto which a mounting nut is screwed. To allow a screwdriver to be attached to the mounting nut, a front wall, running parallel to the rear wall, has an opening open towards the edge, which may have an arcuate edge, for example, extending along straight sections. The tool is visible through this opening. A base plate may be provided, extending in a plane perpendicular to the plane of rotation of the tool. The base plate can be attached to the housing by a pin, screws, or similar fasteners that can form a pivot axis. The working opening located in the narrow side of the housing may face the base plate. The base plate has a through-hole at this point, through which the tool can pass.The size of the segment of the circular-shaped machining tool, preferably a cutting disc, that passes through the opening can be adjusted by the pivot angle of the hood relative to the base plate. For this purpose, the base plate can be pivoted relative to the hood about the pivot axis located at the narrow edge of the working opening. The pivot axis preferably runs approximately in the plane of extension of the base plate and parallel to the axis formed by the axis of rotation of the shaft extension piece. A locking device can be provided to fix the pivot position of the hood relative to the base plate. The locking device can be a metal strip with a slot, in particular an arc-shaped slot. A clamping element can project into the arc-shaped slot. The clamping element can be the threaded shank of a screw that is fixed in a bore in the rear wall.A clamping nut can be screwed onto the threaded shank of the screw. The clamping nut can be a wing nut. The base plate can consist of two elements. The base plate can have a metal body to which the cover is attached. The metal body can be placed on the workpiece to be machined. Alternatively, the metal body can be arranged in a plastic tray manufactured by injection molding, which forms a contact surface with which the base plate can be placed on a surface-sensitive workpiece. Alternatively, the base plate can also consist entirely of a plastic part. Preferably, the base plate consists of a plastic tray, manufactured particularly by injection molding, which forms a contact surface with which the base plate can be placed on a workpiece. The plastic tray can have a rim that forms locking hooks.Within the rim extends a metal plate forming bearing lugs into which bearing journals, such as bearing screws, engage, forming the pivot axis. The bearing lugs can be sections cut from the metal plate and bent at right angles. The locking device can be a strip cut from the metal plate and bent substantially at right angles away from the plastic tray. The edges of the metal plate can be formed by angled ribs that are engaged by locking hooks. The base plate can have a substantially rectangular plan, with a corner recess being provided for this essentially rectangular plan. This corner recess can be used for inserting a handle of the power tool. The hood also has a dust extraction port located on the narrow side of the hood opposite the working opening.A vacuum cleaner's extraction hose can be connected to the extraction port to remove grinding dust generated during use of the machining tool. The shaft extension can have an external thread at its output end, onto which a locking nut can be screwed to securely fasten the machining tool to the shaft extension. The input end can have an internal thread into which an external thread of the power tool's output shaft can be screwed. The power tool's output shaft can be mounted in a swivel bearing, which may be surrounded by a flange onto which the shaft cover can be slid.

[0015] To solve the problem, a shaft extension piece is further provided, which projects into the cavity with an output end to which a circular disk-shaped machining tool can be attached, which is rotatably attached to the rear wall with a rotary bearing and which has a drive end to which an output shaft of the power tool can be attached, and with a sleeve-like shaft cover attached to the rear wall, into which the drive end projects and which has a first opening that points away from the rear wall, characterized in that the axial length of the shaft cover is variable.

[0016] A dust extraction device according to the invention is defined in claim 1. Brief description of the drawings

[0017] The invention will now be explained in more detail using exemplary embodiments. The figures shown are: Fig. 1 shows a perspective view of the dust extraction device of the exemplary embodiment, Fig. 2 a side view in the direction of arrow II. Figure 1 , Fig. 3 a view in the direction of arrow III in Figure 2 , Fig. 4 a bottom view, Fig. 5 the section along line VV in Figure 4 , Fig. 6 the section according to line VI-VI in Figure 5 , Fig. 7 the section according to line VII-VII in Figure 2 Fig. 8 is an exploded view of the essential features of the dust extraction device, Fig. 9 is a view of the dust extraction device with an angle grinder 12, Fig. 10 is a rear view with the angle grinder 12 mounted on the dust extraction device, and Fig. 11 is the section along line XI-XI. Figure 10 . Description of the embodiments

[0018] The figures show a dust extraction device that can be attached to an angle grinder 12 as an additional protective device. A housing, forming a hood 1 which may be made of plastic, surrounds a cutting tool 9 designed as a cutting disc. The hood 1 encompasses the cutting tool 9 at an angle of at least 180 degrees, preferably at an angle of at least 220 degrees. A portion of the area surrounding the cutting tool 9 is not enclosed by a narrow wall 52 of the hood. In this area, the hood forms a working opening 4, which is located at such a short distance to a rotational axis D of the cutting tool 9 that a circular segment 9' of the cutting tool 9 projects out of the hood.The machining tool 9 has a circumferential edge extending along a circular arc and made of an abrasive material, enabling the machining tool 9 to cut into a workpiece or to remove a part from a workpiece. The machining tool can also have teeth, for example, formed by a segmented blade.

[0019] An extraction port 5 is provided, which delimits the cavity 2 of the hood 1. The extraction port 5 adjoins the narrow wall 52. The narrow wall 52 extends from a narrow edge 21 of the working opening 4 to the extraction port 5, which in turn extends to an opposite narrow edge 20 of the working opening 4.

[0020] In the sectional view according to Figure 5The machining tool 9 rotates clockwise so that particles or dust removed from a workpiece (not shown) can be transported towards the extraction port 5, to which a vacuum cleaner can be connected.

[0021] The Figure 7 It can be seen that the hood 1 has a rear wall 3, which forms the rear wall of a cavity 2 in which the machining tool 9 can rotate. A front wall 42 forms the front wall of the cavity 2, which only partially delimits the cavity to the outside. The front wall 42 has an opening 43.

[0022] A bearing flange 16 is attached to the rear wall 3. The bearing flange 16 forms a cup-shaped recess 47 in which two ball bearings or roller bearings are arranged side by side. These bearings form a rotary bearing 10, which supports a shaft. The shaft is a shaft extension piece 7, with which an output shaft 13 of an angle grinder 12, which is rotatably driven by an electric motor, can be extended. For this purpose, the end of the output shaft 13 is, as shown in the Figure 11 The machining tool 9 is connected to a drive end 11 of the shaft extension piece 7. At an output end 8 of the shaft extension piece 7, the machining tool 9 is attached with a retaining nut 44, which is screwed onto an external thread of the output end 8, with a washer interposed.

[0023] The shaft extension piece 7 is inserted into the rotary bearing 10 from the outside, relative to the cavity 2. An annular step 46 rests against the rotary bearing 10. An annular groove is provided on the output end 8, which projects into the cavity 2, and a retaining ring 45 engages in this groove for axial securing.

[0024] A shaft cover 15, made of rubber or another elastic material, has a tubular shape and can be shortened axially against the restoring force of the elastic material. The shaft cover can also be formed by several sleeves that are telescopically displaceable relative to one another. An opening 15' has a radially outwardly projecting collar 48, and the end face of the collar 48 forms a contact surface with which the shaft cover 15 can abut a flange surface 17 of the power tool 12. A cylindrical inner section adjoins the opening 15' and can be fitted onto a flange of the power tool 12. The shaft cover 15 has the overall shape of a bellows. An opening 15" of the shaft cover 15, opposite the opening 15', rests on the bearing flange 16, which supports the rotary bearing 10. The length L of the shaft cover 15 can be shortened by axial pressure.The relaxed length L of the shaft cover 15 is dimensioned such that a clearance gap is formed between the opening 15' and an end face of the drive end 11, in which an internal thread may be located, into which the output shaft 13 of the power tool 12 can engage.

[0025] The distance between the first opening 15' of the shaft cover 15 and the end face of the drive end 11 is preferably more than twice the length L of the shaft cover 15. This distance can be such that an output shaft 13, which may have an external thread and protrudes from a flange surface 17 of the angle grinder 12, lies completely within the shaft cover 15. The external thread of the output shaft 13 can be screwed into an internal thread of the shaft extension piece 7.

[0026] The rear wall 3 of the housing forms an arc-shaped slot 28. With respect to the axis of rotation D of the shaft extension piece 7, the arc-shaped slot 28 is opposite the working opening 4. A fastening screw 29 is inserted into the arc-shaped slot 28. The fastening screw 29 has a head 29' to which a square section is attached, securing the fastening screw 29 in the arc-shaped slot 28 in a rotationally fixed manner.

[0027] The threaded shank 29" of the fastening screw 29 engages a longitudinal slot 50 of a short leg 27' of an anti-rotation element 14. The anti-rotation element 14 is formed by an L-shaped metal strip, the longer leg 27 of which forms an elongated hole 31. This slot allows the anti-rotation element 14 to be attached to the power tool 12, thus preventing the dust extraction unit from rotating to the power tool 12. The anti-rotation element 14 is preferably fastened with the handle fastening screw 32, which secures a handle 33 to the power tool 12. The handle fastening screw 32 extends through an elongated handle 33 of the power tool 12. The handle fastening screw 32 runs along the axis of the rotationally symmetrical handle 33. The handle fastening screw 32 passes through the elongated hole 31 and is screwed into a threaded bore 34.

[0028] The hood 1 is attached to a base plate 18. Specifically, it is attached to a sheet metal body 38, which can also be used as a support surface for machining workpieces even without the plastic tray 35 shown in the drawings. The working opening 4 faces the base plate 18. While the rear wall 3 adjoins the working opening 4 with a substantially straight edge, the front wall 42 forms an arc-shaped opening 43 adjacent to the working opening 4. The arc-shaped opening 43 provides access to the fastening nut 44 for loosening and changing the machining tool 9, which is preferably a cutting disc.

[0029] A pivot bearing is located at a narrow edge 20 of the working opening 4, forming a pivot axis S about which the hood 1 can be pivoted relative to the base plate 18 by a pivot angle α of at least 20 degrees in order to influence the size of the effective circular segment 9'. The pivot axis S is formed by two aligned screws 39 inserted into eyes 41. Alternatively, the pivot axis S can be formed by a single screw, which, for example, can pass through both eyes 41. The eyes 41 are formed by the base plate 18. These are angled, cut-out sections of a sheet metal body 38 of the base plate 18. The self-tapping threaded sections of the screws 39 are screwed into screw holes in the hood 1. The eyes 41 can also be welded to the sheet metal body 38 or formed by brackets screwed to the sheet metal body 38.

[0030] The pivot position of the hood 1 relative to the base plate 18 can be fixed. For this purpose, a clamping screw 25 engages in an arc-shaped elongated hole 23 formed by a metal strip 22 that is fixedly connected to the base plate 18. The clamping screw 25 has a head 25' with a square section that fits into a square bore in the rear panel 3, preventing the clamping screw 25 from turning. A nut, in this embodiment a wing nut 26, is screwed onto the threaded section 25" of the clamping screw 25. The clamping screw 25 can be adjacent to a second narrow edge 21, which is opposite the first narrow edge 20. The metal strip 22 can be an angled, cut-out section of the sheet metal body of the base plate 18. However, the metal strip 22 can also be welded or screwed to the sheet metal body 38.

[0031] The base plate 18 has a substantially rectangular plan, with a corner recess 51 provided within the rectangular plan, into which a gearbox housing of the power tool 12 can be inserted when it has a certain pivot position relative to the hood 1.

[0032] A plastic tray 35 is associated with the base plate 18. The plastic tray 35 forms the base surface on which the dust extraction device can be placed on a workpiece surface. The sheet metal body 38 is located inside the plastic tray 35. The plastic tray 35 has a rim 36 that forms a rib extending away from the base surface. The sheet metal body 38 extends within this rim 36, its rim forming a rib 40 that is engaged at various sections by locking hooks 37 of the rim 36, so that the plastic tray 35 is held securely to the metal plate formed by the sheet metal body 38.

[0033] The dust extraction device is used in conjunction with an angle grinder forming the power tool 12. The angle grinder has an elongated housing to which a handle 33 is attached with a fastening screw 32, which is screwed into a threaded bore 34. The output shaft 13 of the angle grinder protrudes from a flange, to which a flat flange surface 17 adjoins.

[0034] For assembly, an external threaded section of the output shaft 13 is screwed into an internal thread of the shaft extension piece 7. The collar 48 then rests against the flange surface 17. As the output shaft 13 engages in the recess of the shaft cover 15, the shaft cover 15 is compressed, thus reducing its length L. The material of the shaft cover 15 is sufficiently elastic that the collar 48 bears against the flange surface 17 under the force applied during the compression of the shaft cover 15. The other end 15" of the shaft cover 15 is firmly connected to the bearing flange 16. It can be held there by friction or it can be bonded to the cylindrical surface of the bearing flange 16.

[0035] The housing of the angle grinder is brought into a suitable rotational position. In this position, the housing is attached to the anti-rotation element 14 by means of the handle fastening screw 32. The handle fastening screw 32 passes through the elongated hole 31 and is screwed into the threaded bore 34. The anti-rotation element 14 is secured to the rear wall 3 by means of the nut 30 and the fastening screw 29.

[0036] The back wall 3 is dimensioned such that the distance a between the axis of rotation D and the edge of the back wall 3 adjacent to the working opening 4 is shorter than the diameter of the machining tool 9. The distance a is significantly shorter than the distance b from the axis of rotation D to a narrow side 52 that, with respect to the axis of rotation D, is opposite the working opening 4. The distance a can be at most one-third of the distance b. This ensures that a circular segment 9' of the disk-shaped tool 9 permanently projects through the working opening 4.

[0037] The Figure 5 This shows that the length of the working opening 4, i.e., the distance between the two narrow edges 20, 21, is greater than the diameter of the machining tool 9. In particular, the length of the working opening 4 is twice as large as the distance b, which denotes the distance of the inner wall of the narrow sides from the axis of rotation D. List of reference symbols 1 hood 25" threaded shaft 2 cavity 26 Mother 3 back panel 27 long thigh 4 Working opening 27' short thigh 5 Suction port 28 Arched slot 7 Shaft extension piece 29 fastening screw 8 Drive end 29' screw head 9 Machining tool 29" threaded shaft 9' segment of a circle 30 Mother 10 pivot bearing 31 Slotted hole 11 drive end 32 Handle mounting screw 12 angle grinder 33 Handle 13 Output shaft 34 Threaded hole 14 Rotation locking element 35 plastic tub 15 Wave cover 36 edge 15' opening 37 Locking hook 15" opening 38 Sheet metal body 16 bearing flange 39 screw 17 flange surface 40 web 18 Base plate 41 Mounting eye 19 Passage opening 42 front wall 20 Narrow edge 43 opening 21 Narrow edge 44 Fastening nut 22 Metal strips, locking devices 45 retaining ring 23 Slotted hole 46 Ring stage 24 Clamping element 47 cup-shaped depression 25 Clamping screw 48 collar 25' screw head 49 Interior section 50 longitudinal slot a Distance 51 Corner recess b Distance 52 narrow wall L length S Swivel axis D axis of rotation α Swivel angle

Claims

1. Dust extraction device for a power tool (12), having a hood (1) comprising a cavity (2) delimited by a back wall (3), a narrow wall (52) and a working opening (4) and comprising an extraction socket (5), having a shaft extension piece (7) which, with an output end (8) to which a circular-disc-shaped processing tool (9) is attachable, projects into the cavity (2), is rotatably fastened to the back wall (3) by means of a rotary bearing (10) and has a drive end (11) to which an output shaft (13) of the power tool (12) is attachable, wherein the hood (1) is attachable to the power tool (12) by means of a first leg (27') of an angle-shaped anti-rotation element (14), and the anti-rotation element (14) has a second leg (27) having an opening for a fastening screw (32) to pass through for fastening the power tool (12) to the anti-rotation element (14), characterized in that the first leg (27') is fastened to the back wall (3) of the hood (1) by means of a fastening element (29), wherein the hood (1) has an arcuate slot (28) through which the fastening element (29) projects, in that the opening of the second leg (27) is an elongated hole (31), wherein the first leg (27') is shorter than the second leg (27), and in that a sleeve-like shaft cover (15), the axial length (L) of which is variable, is fastened to the back wall (3), into which shaft cover the drive end (11) projects and which has a first opening (15') facing away from the back wall (3).

2. Dust extraction device according to claim 1, characterized in that an arcuate slot (28) of the back wall (3) extends around the axis of rotation (D) and the fastening element (29) is a fastening screw, the head of which has a square section with which the fastening screw (29) is inserted in a rotationally fixed manner in the arcuate slot (28).

3. Dust extraction device according to any of the preceding claims, characterized in that the anti-rotation element (14) is formed by a metal strip and is attachable to the power tool (12) by means of a handle fastening screw (32) of the power tool (12).

4. Dust extraction device according to any of the preceding claims, characterized in that the first opening (15') has a radially projecting collar (48) with which the shaft cover (15) can support itself on a flange surface (17) of the power tool (12).

5. Dust extraction device according to any of the preceding claims, characterized in that the shaft cover (15) is formed by a bellows made of an elastic material.

6. Dust extraction device according to any of the preceding claims, characterized in that the distance from the drive end (11) to the first opening (15') is greater than half the length (L) of the shaft cover (15).

7. Dust extraction device according to any of the preceding claims, characterized in that a second opening (15") of the shaft cover (15) opposite the first opening (15') is slid onto a bearing flange (16) projecting from the back wall (3).

8. Dust extraction device according to any of the preceding claims, characterized in that the axis of rotation (D) of the rotary bearing (10) is located at such a distance (a) from the working opening (4) that a circular segment (9') of the processing tool (9) projects outward through the working opening (4), wherein a base plate (18) having a passage opening (19) for the processing tool (9) is fastened to the hood (1) at a narrow edge (20) of the working opening (4) so as to be pivotable about a pivot axis (S) in such a way that the base plate (18) can be fixed in different pivoting positions relative to the hood (1).

9. Dust extraction device according to claim 1, characterized in that locking means (22, 23, 24, 25, 26) are provided in a region of the back wall (3) which, relative to the axis of rotation (D), is opposite the pivot axis (S), with which locking means the pivoting position of the hood (1) relative to the base plate (18) can be locked.

10. Dust extraction device according to claim 8 or 9, characterized in that the base plate (18) is pivotable through a pivot angle of at least 20 degrees.

11. Dust extraction device according to any of claims 8 to 10, characterized in that a shaft of the pivot axis (S), formed in particular by one or more screws (39), is mounted on bent, cut-out regions of a sheet-metal body (38) of the base plate (18).

12. Dust extraction device according to claim 11, characterized in that the locking means (22, 23, 24, 25, 26) comprise a clamping screw (25) which engages in an arcuate elongated hole (23) of a metal strip (22) which is firmly connected to the base plate (18), wherein the metal strip (22) is a bent, cut-out region of the sheet-metal body of the base plate (18).

13. Dust extraction device according to any of claims 11 or 12, characterized in that the base plate (18) forms a plastic tub (35) in which the sheet-metal body (38) is located.

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