extraction attachment

Abstract

Extraction attachment for a tool (300), in particular a drilling tool (302), comprising a housing (13) with an end-face opening (16) designed to receive the tool (300), a bearing unit (28) for mounting the extraction attachment (10) on the tool (300), an extraction opening (20) for coupling the extraction attachment (10) to an extraction device (11), wherein the end-face opening (16) and the extraction opening (20) form a transport channel (26), wherein the extraction attachment (10) is mounted axially movable and rotatable on the tool (300) by means of the bearing unit (28) such that the position of the extraction attachment (10) relative to the tool (300) changes with increasing bore depth, characterized in that the extraction attachment (10) has an actuating element (36) by means of which the position of the movable bearing element can be controlled. (32) is adjustable.

Description

State of the art

[0001] The invention relates to a suction attachment for a tool comprising a housing with an end-face opening designed to receive the tool, a bearing unit for mounting the suction attachment on the tool, and a suction opening for coupling the suction attachment to a suction device, wherein the end-face opening and the suction opening form a transport channel.

[0002] German patent application DE 10 2005 062 888 A1 describes a dust collection kit for connection to a dust extraction system designed to collect drilling dust during drilling operations. The dust collection kit is attached to the hand-held power tool. The following documents were cited during the testing procedure: DE 10 2005 062 888 A1, DE 10 2016 202 248 A1, DE 20 2007 010 514 U1, EP 2 138 254 B1 and DE 10 2012 200 543 A1. Disclosure of the invention

[0003] Based on the state of the art, it is proposed that the extraction attachment be mounted axially movable and rotatable on the tooling by means of the bearing unit, such that the position of the extraction attachment relative to the tooling changes with increasing borehole depth. This advantageously allows for optimal extraction results to be achieved with a very simple extraction attachment.

[0004] The tool can be designed, for example, as a drill bit, in particular as a masonry, wood, or metal drill bit, as a chisel, etc. The tool is specifically designed as a drill bit intended for use with a rotary hammer or impact drill. The tool has a shank end, a shaft section, and a drill head along its longitudinal axis. At its end opposite the drill head, the tool has a shank end designed for coupling with the power tool. Preferably, the tool is designed in the shank end region such that it can be coupled to a tool holder of the power tool. For example, the tool can have positive-locking elements in the shank end region, designed as special grooves, which form an SDS-plus or an SDS-max interface.To machine a workpiece, the tool is set into a rotating and / or linearly oscillating or impact state by means of a hand-held power tool. During machining, the drill bit penetrates the workpiece in the feed direction of the drill bit. The longitudinal axis of the drill bit corresponds, in particular, to a working or rotational axis of the drill bit. In this context, a drill head is understood to be, in particular, a region of the drill bit that has at least one cutting element. The cutting element has at least one cutting component. The at least one cutting component is, in particular, made of a hard metal. Preferably, the outer diameter of the drill head is larger than the outer diameter of the shank region. The outer diameter of the drill head is, in particular, formed by at least one cutting element.

[0005] The dust extraction attachment housing can be a single piece or made of multiple parts. In the one-piece design, the dust extraction attachment is connected to the tool, particularly by sliding it on. The dust extraction attachment can be slid onto the drill head with the front opening facing forward or with the rear opening facing forward. When connected, the front opening faces the drill head of the tool. If the housing is made of multiple parts, for example, two parts connected by a hinge, it is also conceivable that the dust extraction attachment could be connected to the tool via the shaft. For example, the dust extraction attachment could be folded around the shaft and snapped into place using connecting elements.

[0006] In the connected state, the degree of freedom of movement of the extraction attachment is preferably limited to two by the bearing unit. In particular, the extraction attachment on the drilling tool has one translational degree of freedom and one rotational degree of freedom. In particular, the rotational degree of freedom is configured perpendicular to the translational degree of freedom.

[0007] The extraction opening is preferably formed integrally with the housing. The extraction opening can, for example, be designed as a connection nozzle or another device known to those skilled in the art for connecting a housing to an extraction device or a suction hose. The cross-section or diameter of the extraction opening corresponds essentially to the cross-section or diameter of the end-face opening. In particular, the cross-section or diameter of the end-face opening is only insignificantly smaller than the cross-section or diameter of the extraction opening in order to ensure the highest possible air volume flow in the transport duct. The bearing unit is arranged at least partially within the transport duct. The transport duct can have a straight or a curved profile.

[0008] Furthermore, it is proposed that the front opening has a substantially flat contact surface, and that this contact surface encloses a longitudinal axis of the extraction attachment, the longitudinal axis corresponding to a working axis of the tool being used. Advantageously, the contact surface can improve the ergonomics of the extraction attachment. Preferably, the contact surface extends perpendicular to the longitudinal axis.

[0009] It is further proposed that the housing have at least one recess in the area of ​​the end-face opening, interrupting the contact surface. Advantageously, the recess can increase the air volume flow in the transport channel. In particular, the recess forms an area by which the extraction attachment, especially the housing of the extraction attachment, is spaced away from a flat workpiece during machining. Preferably, the recess is arranged on a side of the extraction attachment facing away from the extraction opening.

[0010] Furthermore, it is proposed that the recess have a central angle around the longitudinal axis of at least 10°, in particular at least 30°, preferably at least 60°, and preferably at least 90°. Advantageously, this allows for a sufficiently large air volume flow in the transport duct. The extraction attachment can have a single larger recess with a central angle greater than 60° or several smaller recesses, each with a central angle of at most 60°. It is also conceivable to combine larger and smaller recesses. Various arrangements for the multiple recesses are possible, including adjacent arrangements, uniform spacing, rotationally symmetrical arrangements, mirror symmetrical arrangements with respect to the longitudinal axis, and the like.

[0011] Furthermore, it is proposed that the contact surface be intersected twice by at least one straight line perpendicular to the longitudinal axis. In particular, the contact surface is designed such that it is additionally intersected twice by a further straight line perpendicular to the first. This advantageously ensures a secure hold of the extraction attachment on the workpiece without tilting.

[0012] It is further proposed that the mounting surface be circular or oval-shaped. In particular, the mounting surface is at least partially concave.

[0013] Furthermore, it is proposed that the housing have a fixing element in the area of ​​the front opening, designed to increase static friction between the workpiece being processed and the extraction attachment. In particular, the fixing element forms at least part of the contact surface. Preferably, the fixing element is designed as a rubber lip. Alternatively, it is also conceivable that the housing has a surface texture in the area of ​​the contact surface that increases friction. This advantageously prevents the extraction attachment or the insert tool from slipping on the workpiece.

[0014] Furthermore, it is proposed that the bearing unit has a stationary, in particular stationary and cylindrical, bearing element, wherein the stationary bearing element is designed in particular for backlash-free or backlash-free mounting of the extraction attachment. Advantageously, this allows for the realization of a cost-effective extraction attachment.

[0015] It is further proposed that the bearing unit comprises at least one movable bearing element, which is specifically designed for backlash-free mounting of the extraction attachment. In particular, the bearing unit comprises at least two movable bearing elements that are movable relative to each other. Specifically, the movable bearing element is designed to exert a force on the drilling tool. Preferably, the movable bearing element is designed to center the insert tool or to position the extraction attachment relative to the drilling tool. The length of the bearing unit is, in particular, at least 0.25, preferably at least 0.5, and more preferably at least 0.75 of the length of the extraction attachment, in order to advantageously achieve secure mounting with a compact design of the extraction attachment.

[0016] According to the invention, it is proposed that the extraction attachment has an actuating element by means of which the position of the movable bearing elements can be adjusted. Advantageously, the connection can thus be adjusted manually.

[0017] Furthermore, it is proposed that the movable bearing element be coupled to a deformable area of ​​the housing. Advantageously, the connection between the extraction attachment and the drilling tool can be adjusted by deforming the housing.

[0018] Furthermore, it is proposed that the movable bearing element be made of a plastic, in particular at least partially integral with the housing, or of a metallic material.

[0019] Furthermore, the invention relates to a system with a suction device and a suction attachment, as previously described. It is proposed that the minimum suction force of the suction attachment on a workpiece being processed be greater than the frictional force between the suction attachment and the tool being used. Advantageously, this prevents rotation of the suction attachment during machining of the workpiece. Drawings

[0020] Further advantages arise from the following description of the drawings. The drawings, the description, and the claims contain numerous features in combination. It is advantageous for those skilled in the art to also consider the features individually and combine them into meaningful further combinations. Reference numerals of features of different embodiments of the invention that are essentially identical are provided with the same number and with a letter that identifies the embodiment.

[0021] They show: Fig. 1 a schematic view of a tool system; Fig. 2a a longitudinal section of a first embodiment of a suction attachment; Fig. 2b a further longitudinal section of the first embodiment of the extraction attachment; Fig. 2c a perspective view of the first embodiment of the extraction attachment; Fig. 3a a longitudinal section of a second embodiment of the extraction attachment; Fig. 3b a perspective view of the second embodiment of the extraction attachment; Fig. 4 a longitudinal section of a third embodiment of the extraction attachment; Fig. 5a a cross-section through a coupling area of ​​a fourth embodiment of the extraction attachment; Fig. 5b a cross-section through a coupling area of ​​a fifth embodiment of the extraction attachment; Fig. 5c a cross-section through a coupling area of ​​a sixth embodiment of the extraction attachment; Fig. 5d a cross-section through a coupling area of ​​a seventh embodiment of the extraction attachment; Fig. 5e a cross-section through a coupling area of ​​an eighth embodiment of the extraction attachment; Description of the exemplary implementations

[0022] In Fig. Figure 1 shows a schematic view of a tool system 200. The tool system 200 comprises a tool insert 300, a hand-held power tool 400, a dust extraction attachment 10, and a dust extraction device 11. The hand-held power tool 400 is designed, by way of example, as a rotary hammer. The hand-held power tool 400 has a tool holder 402, which is designed to receive a tool insert 300, designed, by way of example, as a drill bit 302. The hand-held power tool 400 has a drive unit (not shown) comprising an electric motor and a gearbox comprising a pneumatic impact mechanism. Via the drive unit and the gearbox, the drill bit 302 can be driven rotaryally about a longitudinal axis 12 and linearly oscillating or impacting along the longitudinal axis 12 in the coupled state. The tool insert 300 is designed as a drill bit 302, in particular as a rock drill bit.

[0023] The drill tool 302 connected to the extraction attachment 10 is in Fig. 2a before the drilling process or during the initial drilling process and in Fig. Figure 2b shows the area inside the borehole during the drilling process. The drilling tool 302 is specifically designed to create a borehole in a workpiece 15, which is exemplified as a masonry structure. The drilling tool 302 has a shank 316 designed for coupling the drilling tool 302 to the hand-held power tool 400. The shank 316 is essentially cylindrical and has positive locking elements 318 designed as elongated grooves. The tool holder 402 of the hand-held power tool 400 has corresponding positive locking elements (not shown) which, in the coupled state, are connected to the positive locking elements 318 of the drilling tool 302.

[0024] Starting from the shank end 316, the drill tool 302 has a shank section 322 and a drill head 324 along its longitudinal extent. The front end of the drill tool 302 is formed by the drill head 324, and the rear end of the drill tool 302 is formed by the shank end 316. The drill tool 302 has a shank element 340, which forms the shank section 322 and the shank end 316. The drill tool 302 has a helical feed helix in the shank section 322, which is designed as an external groove in the shank element 340 extending helically around the longitudinal axis 12. Alternatively, it is also conceivable that the drill tool 302 has no feed helix or a differently designed one.

[0025] The drill head 324 has a cutting element 328 on its end face, which terminates in a tip 330. The cutting element 328 is, for example, designed as a carbide insert that is inserted into a face-face recess of the shank element 340 and is metallurgically bonded to it via a brazed connection. Alternatively, the cutting element 328 is also conceivable as a solid carbide head that is metallurgically bonded to a blunt face of the shank element 340 via a welded connection. The outer diameter of the drill head 324 is typically larger than the outer diameter of the drill bit 302 in the shank region 322 to prevent the drill bit 302 from tilting or seizing in the borehole. In particular, the outer diameter of the drill head 324 is determined by the cutting element 328.

[0026] The extraction attachment 10 has a housing 13 made of plastic. The housing 13 is, by way of example, formed in one piece and has a coupling area 14 located between an opening 16 on the front and an opening 18 on the rear of the housing 13. In the connected state, the drilling tool 302 is located in the coupling area 14. Furthermore, the extraction attachment 10 has an extraction opening 20, which is designed for coupling the extraction attachment 10 to the extraction device 11. The extraction opening 20 is, by way of example, designed as a connection nozzle 22. The connection nozzle 22 is formed in one piece with the housing 13. The connection nozzle 22 has, in particular, a conical shape. Specifically, the inner diameter of the housing 13 decreases continuously in the area of ​​the connection nozzle 22.The suction attachment 10 can be connected to the suction device 11, designed as an industrial vacuum cleaner, via the connection nozzle 22 using a hose 24 (see . Fig. 1).

[0027] The front opening 16 is connected to the extraction opening 20 in such a way that a transport channel 26 is formed. Within the transport channel 26, an airflow from the front opening 16 to the extraction opening 20 can preferably move essentially unimpeded.

[0028] The extraction attachment 10 has a bearing unit 28 designed to support the extraction attachment 10 on the tool 300. The coupling area 14 is radially bounded by the bearing unit 28 and axially bounded by the front opening 16 and the rear opening 18. The bearing unit 28 is designed as a radial bearing. It comprises a stationary bearing element 30 and a movable bearing element 32, which are connected by a return element 34. The ratio of the length of the bearing unit to the length of the extraction attachment is approximately 0.75. The stationary bearing element 30 is designed as a V-shaped rail, which is fixed to the housing 13 of the extraction attachment 10. The drilling tool 302 rests tangentially against two side surfaces of the stationary bearing element 30. Alternatively, it is also conceivable that the immobile bearing element 30 is formed in one piece with the housing 13.The movable bearing element 32 is also designed as a rail having a circular arc cross-section. The return element 34 is designed, in particular, as a spring clip that at least partially engages the bearing elements 30 and 32. The return element 34 is arranged within the suction attachment 10. The return element 34 applies a radial force to the movable bearing element 32, in particular a force directed towards the stationary bearing element 30. In particular, the movable bearing element 32 is held by the return element 34. The movable bearing element 32 is designed to be tiltable. The stationary bearing element 30 is closed off with the rear opening 18, while the movable bearing element 32 extends outwards through the rear opening 18 and forms an actuating element 36 outside the housing 13.The movement of the actuating element 36 is preferably coupled to that of the movable bearing element 32. In particular, the actuating element 36 and the movable bearing element 32 are formed as a single piece. A force can be manually applied to the movable bearing element 32 via the actuating element 36, which opposes the force of the return element 34.

[0029] Preferably, the extraction attachment 10 is designed such that it can be connected to a drill bit 302 connected to the hand-held power tool 400. To establish the connection, the extraction attachment 10 is slid over the drill head 324 of the drill bit 302 with its rear opening 18. As already described, the drill bit 302 has a larger diameter in the area of ​​the drill head 324 than in the shank area 322. To increase or maximize the distance between the bearing elements 30, 32 in the area of ​​the rear opening 18, the position of the movable bearing element 32 can be manually adjusted via the actuating element 36. While the drill head 324 is moved between the bearing elements 30, 32, their distance is kept essentially constant by the drill head 324. If the extraction attachment 10 is pushed on further, the drill head 324 leaves the bearing unit 28.Since the drill bit 302 has a smaller and constant diameter in the shank area, the movable bearing element 32 is pressed towards the drill bit 302 by means of the return element 34, resulting in a virtually backlash-free mounting of the extraction attachment 10 on the drill bit 302. The extraction attachment 10 is thus axially movable on the drill bit 302. Furthermore, the bearing unit 28 essentially corresponds to a sliding bearing, allowing rotation of the drill bit 302 within the extraction attachment 10 during machining of the workpiece 15. Advantageously, the backlash-free mounting centers the drill bit 302 and / or the extraction attachment 10.

[0030] Before the drilling process begins, the extraction attachment 10 can advantageously be pushed backwards on the drill bit 302 toward the hand-held power tool 400, providing a clear view of the tip 330 of the drill bit 302. The tip 330 can then be positioned at the desired location on the workpiece 15. Subsequently, with the extraction device 11 switched on, the extraction attachment 10 can be pushed forwards until a contact surface 38 rests against the workpiece 15. The contact surface 38 is flat and located in the area of ​​the end-face opening 16. The extraction device 11 creates a vacuum within the transport channel 26, which holds the extraction attachment 10 against the workpiece 15 during the drilling process.The extraction attachment 10 advantageously assists the user in positioning the drill bit 302 on the workpiece 15, as the negative pressure significantly improves the protection against slippage of the drill bit 302, which is centered in the extraction attachment 10. Furthermore, the extraction attachment 10 has a recess 40 in the area of ​​the end-face opening 16. The recess 40 interrupts the flat contact surface 38 and is, for example, located above the longitudinal axis 12, while the extraction opening 20 is located below the longitudinal axis 12. The recess 40 is specifically designed to increase the air volume flow in the transport channel 26.

[0031] In Fig. Figure 2b shows the tool system 200 during the drilling process. As the drilling depth increases, the drill bit 302 moves into the workpiece 15 or the borehole, while the suction attachment 10 is pressed against the workpiece 15 by the negative pressure. This results in a relative movement of the drill bit 302 to the suction attachment 10. Since the suction attachment 10 rests against the workpiece via the contact surface 38, all drilling dust or cuttings produced can be effectively captured and extracted by the suction attachment 10.

[0032] In Fig. Figure 2c shows a perspective view of the front of the extraction attachment 10. The insert tool 300 is shown schematically in this and the following drawings. In the area of ​​the end-face opening 16, the extraction attachment 10 has, in particular, a single larger recess 40. With respect to the longitudinal axis, the recess 40 has a central angle α of over 120°. The recess 40 interrupts the flat contact surface 38 in such a way that an airflow can enter the extraction attachment 10. The contact surface 38 is arc-shaped and extends essentially perpendicular to the longitudinal axis 12.

[0033] In Fig. 3a and Fig. Figure 3b shows an alternative embodiment of the extraction attachment 10a in a longitudinal section and a perspective view of the front. The extraction attachment 10a differs in particular in the design of the bearing unit 28a and the contact surface 38a. The bearing unit 28a has a single, stationary bearing element 30a. The bearing element 30a is, by way of example, made of a metallic material and metallurgically bonded to the plastic housing 13a. However, it is also conceivable that the movable bearing element 30a is integrally formed with the housing 13a and thus also made of plastic. The bearing element 30a is cylindrical. In particular, the bearing element 30a is designed as a tube with a constant diameter. The diameter of the bearing element 30a is selected such that the drill head 324 of the drill tool 302 can be received through the rear opening 18a.A tool insert 300, in which the diameter of the shank area 322 corresponds to the diameter of the drill head 324, is thus received without play; if the diameter of the drill head 324 is larger, the tool insert 300 is received with play or inserted from the rear into the front opening 16.

[0034] In the area of ​​the end-face opening 16, the extraction attachment 10a has four small recesses 40a. The recesses 40a have a central angle α of less than 70° with respect to the longitudinal axis 12. The contact surface 38a is thus interrupted at four points in the circumferential direction by the recesses 40a. With respect to the longitudinal axis 12a, the four sections of the contact surface 38a are arranged opposite each other in pairs. This advantageously prevents the extraction attachment 10a from tilting on the workpiece 15. However, a different number of recesses 40a and thus contact surfaces 38a is also conceivable.

[0035] The housing 13a of the extraction attachment 10a is shown as a single piece. However, it is also conceivable that the housing 13a is formed from two housing halves, each having a fixed bearing element 30a designed as a half-tube. The two housing halves can have a hinge above the longitudinal axis 12a and locking means below the longitudinal axis 12a to form a snap-fit ​​connection between the two housing halves. Advantageously, this allows for the realization of an extraction attachment that can be directly connected to the shaft area 322 of the insert tool 300.

[0036] In Fig. Figure 4 shows a further alternative embodiment of the extraction attachment 10b. This embodiment differs in particular in the design of the bearing unit 28b. The bearing unit 28b comprises two movable bearing elements 32b. The two bearing elements 32b are arranged opposite each other. The bearing elements 32b are formed integrally with the housing 13b, the housing 13b being made of an elastic plastic. The movable bearing elements 32b are designed as support elements that extend radially inwards from a wall delimiting the transport channel 26b and exert a force on the insert tool 300 to fix it in place.

[0037] In Fig. Sections 5a to 5e describe further embodiments of the bearing unit based on cross-sections through the coupling area.

[0038] In Fig. In section 5a, the bearing unit 28c has two movable bearing elements 32c, which are designed as resilient sheet metal strips. The bearing elements 32c are movable relative to each other and to the housing 13c of the extraction attachment 10c. The two bearing elements 32c are arranged essentially parallel to each other. The bearing elements 32c are positively connected to the housing 13c. When the extraction attachment 10c is connected to a drill bit 302, which has a larger diameter than the distance between the bearing elements 32c in the unconnected state, the drill bit 302 moves the bearing elements 32c radially outwards, thus increasing the distance between them. Due to the resilient nature of the bearing elements 32c, a radially opposing restoring force is exerted on the drill bit 302 by the movable bearing elements 32c. Advantageously, this results in centering.Thus, the movable bearing element 32c is formed integrally with the return element 34c. In other words, the function of both the movable bearing element 32c and the return element 34c is performed by the same component. Alternatively, it is also conceivable that the bearing unit 28c has another pair of bearing elements extending perpendicular to the first (indicated by a dashed line).

[0039] In Fig. In Figure 5b, the bearing unit 28d also has movable bearing elements 32d, which are integrally formed with the return element 34d. The bearing elements 32d are designed as spring bars, in particular as metallic spring bars, and are positively connected to the housing 13d at a first end. Alternatively, it is also conceivable that the bearing elements 32d are integrally formed with the housing 13d and are made of plastic. The bearing unit 28d has, in particular, three bearing elements 32d, which are arranged symmetrically around the longitudinal axis 12d. In the connected state, the return elements 34d bear tangentially against the drill 302 at a free second end opposite the first end. The bearing elements 32d are deflected depending on the diameter of the drill 300 and, in turn, exert a force on it based on the degree of deflection.

[0040] In Fig. Figure 5c shows a further alternative embodiment of the bearing unit 28e, which essentially corresponds to the bearing unit of the previous embodiment. However, the bearing unit 28e has additional restoring elements 39e that additionally apply a restoring force to the movable bearing elements 32e, which are designed as spring beams. The additional restoring elements 39e are, by way of example, designed as coil springs. Alternatively, however, other designs of the additional restoring elements 39e are conceivable that could be used instead of the coil spring. Advantageously, this allows for the realization of a particularly durable extraction attachment 10e.

[0041] The in Fig. The bearing unit 28f shown in Figure 5d has three cylindrical movable bearing elements 32f. The bearing elements 32f are rotatably mounted, with the axis of rotation of the bearing elements 32f running parallel to the longitudinal axis 12f. The bearing elements 32f are arranged at one end of the return elements 34f, which are designed as spring plates. The bearing unit 28f has three movable bearing elements 32f that are uniformly spaced apart from each other in the circumferential direction. Advantageously, the wear can be reduced by means of the rotatable bearing elements 32f.

[0042] In Fig.Figure 5e shows a further alternative embodiment of the bearing unit 28g. The housing 13g is designed in multiple parts and has at least one deformable housing part 17g. The deformable housing part 17g is designed such that it can be deformed from a rounded shape to a substantially triangular shape by external pressure. Three bearing elements 32g are attached to the inside of the deformable housing part 17g, which can be moved into different positions by deforming the housing part 17g. The bearing elements 32g are each designed as arms 42g, which have a rotatable roller 44g at their end, the roller 44g bearing against the drilling tool 302. The roller 44g is rotatable about a roller axis 46g that extends parallel to the longitudinal axis 12g.The deformation of the housing part 17g allows in particular the distance between the bearing elements 32g, especially the rollers 46g, to be adjusted so that the drilling tool 300 is mounted essentially without play.

Claims

[1] Extraction attachment for a tool (300), in particular a drilling tool (302), comprising a housing (13) with an end-face opening (16) designed to receive the tool (300), a bearing unit (28) for mounting the extraction attachment (10) on the tool (300), an extraction opening (20) for coupling the extraction attachment (10) to an extraction device (11), wherein the end-face opening (16) and the extraction opening (20) form a transport channel (26), wherein the extraction attachment (10) is mounted axially movable and rotatable on the tool (300) by means of the bearing unit (28) such that the position of the extraction attachment (10) relative to the tool (300) changes with increasing bore depth, characterized by , that the extraction attachment (10) has an actuating element (36) by which the position of the movable bearing element (32) can be adjusted. [2] Extraction attachment according to claim 1, characterized by, that the front opening (16) has a substantially flat contact surface (38) and the contact surface (38) encloses a longitudinal axis (12) of the extraction attachment (10), wherein the longitudinal axis (12) corresponds in particular to a working axis of the insert tool (300). [3] Extraction attachment according to claim 2, characterized by , that the housing (13) has at least one recess (40) in the area of ​​the front opening (16) which interrupts the contact surface (38). [4] Extraction attachment according to claim 3, characterized by , that the recess (40) assumes a central angle (α) about the longitudinal axis (12) of at least 10°, in particular at least 30°, preferably at least 60°, preferably at least 90°. [5] Extraction attachment according to any one of claims 2 to 4, characterized by , that the mounting surface (38) is intersected twice by at least one straight line perpendicular to the longitudinal axis (12). [6] Extraction attachment according to one of the preceding claims, characterized by , that the housing (13) has a fixing element in the area of ​​the front opening (16) which is designed to increase static friction between the workpiece to be machined and the extraction attachment. [7] Extraction attachment according to claim 6, characterized by that the fixing element is designed as a rubber lip. [8] Extraction attachment according to one of the preceding claims, characterized by , that the bearing unit (28a) has a fixed bearing element (30a), wherein the fixed bearing element (30a) is designed in particular for backlash-free bearing or for bearing with backlash of the suction attachment (10). [9] Extraction attachment according to one of the preceding claims, characterized by , that the bearing unit (28) has at least one movable bearing element (32) which is designed in particular for backlash-free bearing of the extraction attachment (10). [10] Extraction attachment according to claim 9, characterized by, that the movable bearing element (32) is designed to apply a force to the inserting tool (300). [11] Extraction attachment according to one of claims 9 to 10, characterized by , that the movable bearing element (32g) is coupled to a deformable area of ​​the housing (17g). [12] Extraction attachment according to one of claims 9 to 11, characterized by , that the movable bearing element (32b) is made of a plastic, in particular is formed at least partially in one piece with the housing (13b). [13] Suction attachment according to one of claims 9 to 12, characterized by , that the movable bearing element (32c) is at least partially made of a metallic material. [14] System comprising a suction device (11) and a suction attachment (10) according to any of the preceding claims, characterized by, that a minimum suction force of the extraction attachment (10) on a workpiece (15) to be processed is greater than a frictional force between the extraction attachment (10) and the tool used (300).

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