Tool device, hand-held power tool, and method for the production of such a tool device

Abstract

The invention relates to a tool device (10) for a hand-held power tool (12) with an oscillating drive, said tool device comprising at least one connection unit (14), which is provided for connecting to the drive of the hand-held power tool (12) for conjoint rotation therewith, and at least one tool unit (16), which is at least predominantly made of steel, for machining a workpiece, said tool unit having at least one main connection surface (18) on which the tool unit (16) is secured to the connection unit (14). According to the invention, the main connection surface (18) extends transversely to a main extension plane of the tool unit (16).

Description

[0001] Description

[0002] Tool device, hand tool and method for producing such a tool device

[0003] State of the art

[0004] A tool device for a hand-held power tool having an oscillating drive has already been proposed, comprising at least one connecting unit which is provided for a rotationally fixed connection to the drive of the hand-held power tool, and comprising at least one at least predominantly steel tool unit for machining a workpiece, which tool unit has at least one main connecting surface to which the tool unit is fastened to the connecting unit.

[0005] Disclosure of the invention

[0006] The invention is based on a tool device for a hand-held power tool having an oscillating drive, with at least one connecting unit which is provided for a rotationally fixed connection to the drive of the hand-held power tool, and with at least one at least predominantly steel tool unit for machining a workpiece, which has at least one main connecting surface to which the tool unit is fastened to the connecting unit.

[0007] It is proposed that the main connection surface extends transversely to a main extension plane of the tool unit. The connection unit is preferably provided for transmitting force and / or torque from the drive of the handheld power tool to the tool unit. The connection unit preferably defines a pivot axis of the tool device, which specifies a pivoting movement of the tool unit along a machining path about the pivot axis in order to machine the workpiece. The connection unit preferably comprises a device interface, which is provided for aligning the tool device with the drive.The device interface comprises, for example, at least one receiving element, such as an opening, a bulge, a blind hole or the like, which is intended to at least partially encompass a drive shaft or a gear element of the drive of the hand-held power tool, in particular over an angular span of at least 180°, in a pivot plane perpendicular to the pivot axis. The receiving element can have a round, square, U-shaped, star-shaped or otherwise shaped contour in the pivot plane. The tool device preferably comprises a radial direction, in particular a feed direction, which runs at least substantially perpendicular to the intended pivot axis and at least substantially perpendicular to the machining path.The expression “essentially perpendicular” is intended here in particular to define an orientation of a direction relative to a reference direction, wherein the direction and the reference direction, in particular viewed in a projection plane, enclose an angle of 90° and the angle has a maximum deviation of in particular less than 8°, advantageously less than 5° and particularly advantageously less than 2°. The tool device preferably has a maximum longitudinal extent along the radial direction. The tool unit and the connecting unit are preferably arranged one behind the other along the maximum longitudinal extent of the tool device, with the connecting unit being arranged closer to the pivot axis. The tool unit and the connecting unit are preferably connected to one another in a materially bonded manner, in particular welded to one another.

[0008] The connecting unit and / or the tool unit are preferably made of a plate-like material. Preferably, a main extension plane of the connecting unit and / or a main extension plane of the tool unit is at least substantially perpendicular to the pivot axis. A "main extension plane" of a structural unit is understood to mean, in particular, a plane that is parallel to a largest side surface of a smallest imaginary cuboid that just completely encloses the structural unit, and in particular, runs through the center of the cuboid.A material thickness of the connecting unit and / or a material thickness of the tool unit is preferably substantially smaller, in particular at least by a factor of 2, preferably at least by a factor of 5, particularly preferably by at least a factor of 10, than the maximum longitudinal extent of the tool device and / or than a maximum transverse extent of the tool device, which runs at least substantially perpendicular to the maximum longitudinal extent and the pivot axis. A maximum axial extent of the connecting unit and / or a maximum axial extent of the tool unit in a direction parallel to the pivot axis can be equal to or greater than their, in particular respective, material thickness. The maximum axial extent of the connecting unit and / or the maximum axial extent of the tool unit is preferably smaller than the maximum longitudinal extent and in particular smaller than the maximum transverse extent.

[0009] The tool device is preferably intended for machining the workpiece. The tool device can be designed specifically for machining a workpiece made of wood, metal, or plastic, or as a universal tool device. The tool unit preferably comprises a base body and at least one machining element formed integrally with the base body. “Integral” should be understood in particular to mean at least materially connected, for example by a welding process, an adhesive process, an injection molding process, and / or another process deemed appropriate by a person skilled in the art, and / or advantageously formed in one piece, for example by production from a single casting and / or by production using a single-component or multi-component injection molding process, and advantageously from a single blank.The at least one machining element is preferably intended for direct contact with the workpiece. The at least one machining element and the connecting unit are preferably arranged at ends of the base body facing away from one another in the radial direction. The base body preferably defines a maximum possible immersion depth of the tool device into the workpiece in the radial direction. A maximum extension of the at least one machining element in the radial direction is preferably smaller, in particular at least by a factor of two, particularly preferably at least by a factor of three, smaller than a maximum extension of the base body in the radial direction. The fact that the tool unit is at least predominantly made of steel should preferably be understood to mean that at least the base body is made of steel. The base body is preferably made of low-alloy steel.Particularly preferably, the base body has a carbon content of at least 0.3% and / or at most 0.7%. Preferably, the base body has a weldability of more than 1, in particular of at least 9, particularly preferably of at least 12. The weldability is S 42 • 10. 6 of a material is given by s = — - , where X is the thermal conductivity of the

[0010] material, the electrical conductivity of the material and T the melting point of the material. For example, the base body is made of 1 .8161. The at least one machining element can be made of a steel, for example a tool steel, in particular a high-speed steel (HSS), or a metal matrix composite material, in particular a hard metal or a cermet. The connecting unit is preferably made of a steel, in particular of the same or a different steel as the base body of the tool unit. The connecting unit is preferably made of a low-alloy steel. The connecting unit particularly preferably has a carbon content of at least 0.3% and / or of at most 0.7%. The connecting unit preferably has a welding inclination of more than 1, preferably of at least 9, in particular of at least 12. For example, the connecting unit is made of 1.8159 manufactured.

[0011] The main connection surface is preferably a surface of the base body which runs in particular transversely to a main extension plane of the base body. “Transversely” should preferably be understood to mean an angle of more than 10°, preferably of more than 30°, particularly preferably of at least 45°. In particular, the main connection surface runs at least substantially perpendicular to the main extension plane of the tool unit. The main connection surface is preferably a surface of the base body which runs in particular transversely to a main extension plane of the base body. The main connection surface preferably runs at least substantially perpendicular to the radial direction. The main connection surface is preferably intended for a materially bonded connection with the connection unit and is designed in particular as a welding surface.The main connecting surface preferably runs at least substantially perpendicular to the main extension plane of the base body. The main connecting surface can be flat, curved, or stepped perpendicular to the radial direction and in particular parallel or perpendicular to the pivot axis. The main connecting surface is preferably intended to be welded to the connecting unit. The main connecting surface can be fused to the connecting unit completely, in sections, or at specific points. The connecting unit and the tool unit are preferably arranged alongside one another without overlap along a direction parallel to the pivot axis. "Provided" is to be understood in particular as meaning specially programmed, designed, and / or equipped.The fact that an object is intended for a specific function should be understood in particular to mean that the object fulfils and / or executes this specific function in at least one application and / or operating state.

[0012] Due to the design according to the invention, particularly in contrast to a main connecting surface arranged parallel to the main extension plane of the tool unit, the connecting unit and / or the tool unit can be advantageously kept short in the radial direction and / or a mass moment of inertia of the tool device can be advantageously kept small. In particular, an advantageously large maximum immersion depth of the tool unit into the workpiece can be achieved, particularly with an advantageously small mass moment of inertia.

[0013] It is further proposed that the tool unit and the connecting unit be secured to one another by at least one butt weld on the main connecting surface. The butt weld is preferably designed as a full-bore weld. The butt weld is preferably designed as an I-shaped weld, alternatively as a V-shaped weld, U-shaped weld, or the like. Alternatively, the connecting unit and the tool unit have a flanged butt weld, a T-shaped butt weld, a slanted butt weld, or a corner butt weld. The inventive design allows the tool device to be advantageously kept flat in the direction parallel to the pivot axis.It is further proposed that the tool device comprise at least one weld seam connecting the tool unit and the connecting unit, in particular the aforementioned butt weld seam, which extends at least substantially completely across the entire maximum transverse extent of the tool unit at the main connecting surface. "Substantially completely" is to be understood as meaning, in particular, more than 30%, preferably more than 60%, particularly preferably more than 90%. The tool device can have precisely one continuous weld seam at the main connecting surface or several weld seam sections and / or spot welds distributed across the main connecting surface in the direction of the maximum transverse extent.In a configuration with multiple weld seam sections and / or spot welds, their combined length preferably corresponds at least substantially to the entire maximum transverse extent of the tool unit at the main connection surface. The configuration according to the invention advantageously allows the tool device to be held stable, particularly even with a relatively small main connection surface.

[0014] It is further proposed that the connecting unit comprise at least one device interface, in particular the one already mentioned, for connection to the handheld power tool and at least one tool fastening projecting away from the tool fastening, to which the tool unit is fastened, wherein a maximum extension of the tool fastening from the device interface to the tool unit is at least less than 45% of a maximum extension of the device interface. Preferably, the tool unit is arranged with the main connection surface on the tool fastening, in particular welded to the tool fastening. A main extension plane of the device interface and the tool fastening can be identical, offset parallel to one another, or run obliquely to one another.Preferably, the maximum extension of the tool attachment, starting from the device interface, in the radial direction is less than 40%, particularly preferably less than 35%, in particular less than 25%, of the maximum extension of the device interface in the radial direction. Due to the design according to the invention, the connecting unit advantageously comprises little material, can advantageously be manufactured cost-effectively, and has an advantageously low mass moment of inertia with respect to the pivot axis.

[0015] It is further proposed that the connecting unit and the tool unit are arranged at least substantially flush with one another on the main connecting surface in a direction perpendicular to the main extension plane. The tool unit preferably has two largest outer surfaces, namely a top side and a bottom side. The largest outer surfaces are preferably aligned at least substantially parallel to one another and in particular to the main extension plane of the tool unit. The term "substantially parallel" is to be understood here in particular as an alignment of a direction relative to a reference direction, in particular in a plane, wherein the direction has a deviation from the reference direction of in particular less than 8°, advantageously less than 5° and particularly advantageously less than 2°. In particular, the smallest distance between the largest outer surfaces is equal to the material thickness of the tool unit.The upper side is preferably intended to be arranged facing the handheld power tool when the tool device is arranged on the drive. The lower side is preferably intended to be arranged facing away from the handheld power tool when the tool device is arranged on the drive. The lower side can be arranged the same distance from or further away from the device interface than the upper side. Preferably, the lower side is aligned at least substantially flush with a surface of the tool attachment. The upper side can be aligned at least substantially flush with a surface or offset from a surface of the tool attachment. “Substantially flush” should preferably be understood to mean an offset of less than 15%, preferably less than 10%, particularly preferably less than 5% of the material thickness of the tool unit.In particular, an offset between two at least substantially flush surfaces is less than 0.3 mm, preferably less than 0.2 mm, particularly preferably less than 0.1 mm. In an alternative embodiment, the underside and the tool fastening are offset from one another, in particular by more than 0.3 mm, in a direction perpendicular to the pivoting plane, wherein such an offset is preferably less than 1 mm, preferably less than 0.75 mm, particularly preferably less than 0.5 mm. By means of the embodiment according to the invention, the risk of damage to a substrate when placing the tool device on the substrate and in particular when guiding the tool device along the substrate can be advantageously kept small.

[0016] It is further proposed that the tool device has a maximum immersion depth into the workpiece which is at least substantially equal to or greater than a maximum radial extent of the tool unit. The tool unit preferably has its maximum radial extent in the radial direction. The maximum radial extent can be the greatest extent of the tool unit or smaller than a maximum transverse extent of the tool unit perpendicular to the radial extent and a material thickness. Preferably, the base body has a smaller or equal material thickness than / as the machining element of the tool unit. The fact that two extents are “substantially equal” should preferably be understood to mean that they are equal to a deviation of less than 10%, preferably less than 7.5%, particularly preferably less than 5%, in particular less than 2.5% of the possibly greater extent.In some embodiments, the connecting unit forms a stop element which limits the maximum immersion depth. The stop element can, for example, be formed by a shoulder on the main connecting surface, which results when the material thickness of the connecting unit is greater than the material thickness of the main body of the tool unit. Alternatively, the main body and the connecting unit have at least substantially the same material thickness, in particular so that the maximum immersion depth extends radially beyond the main connecting surface. By means of the embodiment according to the invention, a maximum immersion depth to be provided can be achieved with an advantageously low mass moment of inertia of the tool device. In particular, an advantageously large immersion depth can be achieved with a predetermined maximum mass moment of inertia of the tool device.

[0017] It is further proposed that the tool unit comprise at least one blade element for machining the workpiece. The base body of the tool unit is preferably designed as a blade element. The machining element is particularly preferably designed as a cutting bar, which can be geometrically defined or undefined. The machining element can be designed, in particular, for sawing, scraping, grinding, and / or cutting. The configuration according to the invention makes it possible to provide an advantageous blade tool device with an advantageously high immersion depth.

[0018] Furthermore, a handheld tool with an oscillating drive and with a tool device according to the invention that can be connected to the drive is proposed. The drive is preferably intended to generate a back-and-forth movement of the tool device, in particular with a maximum frequency of more than 5 kHz, preferably more than 10 kHz, particularly preferably more than 15 kHz. The handheld tool can preferably be held with one hand and preferably operated with one hand, in particular the same hand. The handheld tool has in particular a mass of less than 5 kg, preferably less than 3 kg, particularly preferably less than 2 kg. The tool device, in particular the device interface, and the drive are preferably designed for non-destructive attachment and detachment of the tool device from the drive. The tool device is preferably designed as a replaceable accessory part of the handheld tool.The design according to the invention makes it possible to provide a hand-held tool with an advantageously large immersion depth and / or an advantageously low energy requirement due to an advantageously low mass moment of inertia of the tool device.

[0019] Furthermore, a method for producing a tool device according to the invention is proposed. Preferably, the tool unit and the connecting unit are manufactured in separate production steps as at least predominantly steel finished parts. Preferably, the tool unit is aligned with the main connecting surface facing the connecting unit and, in particular, is arranged on the tool fastening of the connecting unit. Preferably, the connecting unit, in particular the tool fastening, and the tool unit are connected to one another by fusion welding, in particular without welding aid or with welding aid. Particularly preferably, the tool unit and the connecting unit are connected to one another at the main connecting surface by laser welding, alternatively by resistance fusion welding, by arc fusion welding, or the like.The design according to the invention enables an advantageously large immersion depth of the tool device to be achieved.

[0020] It is further proposed that the tool unit and the connecting unit be butt-welded to one another. Preferably, the main connecting surface of the tool unit butts the tool fastening of the connecting unit. A main extension plane of the mating connecting surface of the tool fastening preferably runs transversely, in particular at least substantially perpendicular, to the pivoting plane. The mating connecting surface can be completely or partially flat, curved, or provided with steps. The mating connecting surface and the main connecting surface are, for example, complementary, rotationally symmetrical, and / or mirror-symmetrical to one another. The main connecting surface and the mating connecting surface are preferably arranged facing one another and subsequently welded together. The design according to the invention makes it possible to achieve an advantageously large immersion depth of the tool device.

[0021] The tool device according to the invention, the handheld power tool according to the invention, and / or the method according to the invention are not intended to be limited to the application and embodiment described above. In particular, the tool device according to the invention, the handheld power tool according to the invention, and / or the method according to the invention may, in order to fulfill a functionality described herein, have a number of individual elements, components, units, and method steps that differs from the number stated herein. Furthermore, in the value ranges specified in this disclosure, values ​​within the stated limits are also to be considered disclosed and can be used arbitrarily.

[0022] Drawings Further advantages will become apparent from the following description of the drawings. The drawings illustrate an exemplary embodiment of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0023] They show:

[0024] Fig. 1 is a schematic representation of a hand tool with a tool device according to the prior art,

[0025] Fig. 2 is a schematic representation of a hand tool according to the invention with a tool device according to the invention,

[0026] Fig. 3 is a schematic perspective view of the tool device according to the invention,

[0027] Fig. 4 is a schematic side view of the tool device according to the invention from a direction perpendicular to a pivot axis of the tool device according to the invention,

[0028] Fig. 5 is a schematic detailed view of a connection point of a connecting unit and a tool unit of the tool device according to the invention from the same direction as Fig. 4,

[0029] Fig. 6 is a schematic view of the tool device according to the invention from a direction parallel to the pivot axis and

[0030] Fig. 7 is a schematic flow diagram of a method according to the invention.

[0031] Description of the embodiment

[0032] Figure 1 shows a commercially available handheld power tool 12' with an oscillating drive and with a commercially available tool device 10' connected to the drive. The tool device 10' comprises at least one connecting unit 14', which is provided for a rotationally fixed connection to the drive of the handheld power tool 12'. The tool device 10' comprises a tool unit 16' for machining a workpiece. The tool unit 16', which has at least one main connecting surface 18', is fastened to the connecting unit 14' by means of the main connecting surface 18'. The main connecting surface 18' runs parallel to a main extension plane of the tool unit 16' and is fastened to the connecting unit 14' by means of several, here exemplary five, spot welds 44'.

[0033] Figure 2 shows a handheld power tool 12. The handheld power tool 12 comprises an oscillating drive. The handheld power tool 12 comprises a tool device 10 connectable to the drive, which is shown here in a state connected to the drive and in Figure 3 in a state detached from the drive. The drive preferably comprises at least one electric motor. The drive preferably comprises at least one gear for transmitting a force and / or a torque from the motor to the tool device 10. The handheld power tool 12 preferably comprises at least one electrical supply unit for supplying the motor with electrical energy. The electrical supply unit can comprise at least one rechargeable battery and / or a power supply unit for supplying the motor with electrical energy. The handheld power tool 12 preferably comprises at least one housing 46.Preferably, at least the drive and in particular the electrical supply unit are arranged in the housing 46. The tool device 10 preferably comprises a device interface 22 for reversibly connecting the tool device 10 to the drive. The drive preferably comprises at least one tool interface 47 compatible with the device interface 22. The drive is preferably provided to effect an oscillating pivoting movement of the tool device 10' about a pivot axis 36. The pivot axis 36 preferably runs at least substantially perpendicular to a maximum longitudinal extent of the handheld power tool 12.

[0034] Figures 3 to 6 show different views of the tool device

[0035] 10. The tool device 10 comprises at least one connecting unit 14, which is provided for a rotationally fixed connection to the drive of the handheld power tool 12. The connecting unit 14 preferably forms the device interface 22. The tool device 10 comprises at least one at least predominantly steel tool unit 16 for machining a workpiece. The tool unit 16 comprises a main connecting surface 18. The tool unit 16 is fastened to the connecting unit 14 by the main connecting surface 18. The main connecting surface 18 runs transversely to a main extension plane of the tool unit 16.

[0036] The tool unit 16 preferably comprises a base body and a processing element 34 fastened to the base body. The processing element 34 is preferably designed as a cutting bar. The processing element 34 can be designed for sawing, scraping, grinding, and / or cutting. The processing element 34 here, for example, has a plurality of teeth for processing the workpiece. The base body preferably forms a blade element 30 for the processing element 34. The base body is preferably plate-shaped and forms an upper side 48 and a lower side 50 as its largest outer surfaces. The upper side 48 and the lower side 50 preferably run at least substantially parallel to one another and to the main extension plane of the tool unit 16. The main extension plane of the tool unit 16 preferably runs at least substantially perpendicular to the pivot axis 36.The main connecting surface 18 preferably forms a side surface of the base body, which connects the top side 48 and the bottom side 50 to one another. The tool unit 16 preferably has a maximum radial extension 28 along a radial direction running perpendicular to the pivot axis 36. The radial extension 28 is in particular equal to a maximum longitudinal extension of the tool unit 16. The main connecting surface 18 is preferably formed by a side surface whose main extension plane runs at least substantially perpendicular to the maximum radial extension 28 of the tool unit 16 and in particular at least substantially parallel to the pivot axis 36. The main connecting surface 18 is preferably flat, alternatively curved or stepped. The main connecting surface 18 is in particular formed by the smallest side surface of the base body.The main connecting surface 18 and the machining element 34 are particularly preferably arranged at opposite ends of the base body of the tool unit 16 in the radial direction perpendicular to the pivot axis 36.

[0037] The connecting unit 14 comprises the device interface 22 for connection to the handheld power tool 12. The connecting unit 14 comprises at least one tool attachment 24 protruding from the device interface 22, to which the tool unit 16 is attached. A maximum radial extension 58 of the tool attachment 24 in the radial direction from the device interface 22 to the tool unit 16 is at least less than 45% of a maximum radial extension 56 of the device interface 22 (see Fig. 6). The tool attachment 24 here, for example, forms a ramp running transversely to the pivot axis 36. Alternatively, a main extension plane of the tool attachment 24 runs at least substantially perpendicular to the pivot axis 36. The tool attachment 24 preferably comprises a mating connection surface 38 (see Fig. 5) on which the main connection surface 18 of the tool unit 16 is arranged.A main extension plane of the counter-connection surface 38 preferably runs transversely, in particular at least substantially perpendicular to a main extension plane of the connecting unit 14 and in particular at least substantially parallel to the pivot axis 36.

[0038] The tool device 10 comprises a weld seam 20 connecting the tool unit 16 and the connecting unit 14, which extends at least substantially completely over an entire maximum transverse extent of the tool unit 16 at the main connecting surface 18. The maximum transverse extent preferably runs at least substantially perpendicular to the maximum radial extent 28 and the pivot axis 36. The weld seam 20 is designed as a butt weld seam.

[0039] Figure 5 shows a view of the tool device 10 from a perspective parallel to the main connecting surface 18. The connecting unit 14 and the tool unit 16 are arranged at least substantially flush with one another at the main connecting surface 18 in a direction perpendicular to the main extension plane of the tool unit 16. Particularly preferably, the underside 50 of the base body of the tool unit 16 is arranged at least substantially flush with an underside of the tool attachment 24. The underside 50 of the base body is preferably a side of the base body facing away from the handheld power tool 12 when the tool device 10 is connected to the drive. The top side 48 of the base body is preferably a side of the base body facing toward the handheld power tool 12 when the tool device 10 is connected to the drive.Preferably, a material thickness 40 of the tool attachment 24 is greater than a material thickness 42 of the base body of the tool unit 16, in particular so that the upper side 48 of the base body of the tool unit 16 and an upper side of the tool attachment 24 form a shoulder. The shoulder preferably extends at least over 0.2 mm, in particular over at least 0.4 mm, in a direction parallel to the pivot axis 36. Alternatively, the upper side is at least substantially flush with the tool attachment 24. The tool device 10 has a maximum immersion depth 26 (cf. Figure 4) into the workpiece, which is at least substantially equal to the maximum radial extent 28 of the tool unit 16. The maximum immersion depth 26 is limited in particular by the shoulder.The machining element 34 can have a machining width parallel to the pivot axis 36 which is the same size, as shown here by way of example, or greater than the material thickness 40 of the base body, in particular so that the maximum immersion depth 26 is not limited by the shoulder.

[0040] Figure 7 shows a flow chart of a method 32 for producing the tool device 10. The connecting unit 14 and the tool unit 16 are preferably manufactured separately from one another. The method 32 preferably comprises an arrangement step 52 in which the tool unit 16 is arranged on the connecting unit 14 such that the main connecting surface 18 faces the mating connecting surface 38. The method 32 preferably comprises a joining step 54 in which the tool unit 16 and the connecting unit 14 are butt-welded to one another. Preferably, the main connecting surface 18 and the mating connecting surface 38 are integrally joined to one another by fusion welding, in particular laser welding. Preferably, the connecting unit 14 and the tool unit 16 are joined with the single, continuous weld seam 20.

Claims

Claims 1. Tool device (10) for a hand-held tool (12) having an oscillating drive, with at least one connecting unit (14) which is provided for a rotationally fixed connection to the drive of the hand-held tool (12), and with at least one at least predominantly steel tool unit (16) for machining a workpiece, which has at least one main connecting surface (18) to which the tool unit (16) is fastened to the connecting unit (14), characterized in that the main connecting surface (18) runs transversely to a main extension plane of the tool unit (16).

2. Tool device (10) according to claim 1, characterized in that the tool unit (16) and the connecting unit (14) are fastened to one another by at least one butt weld on the main connecting surface (18).

3. Tool device (10) according to claim 1 or 2, characterized by at least one weld seam (20) connecting the tool unit (16) and the connecting unit (14), which extends at least substantially completely over an entire maximum transverse extent of the tool unit (16) on the main connecting surface (18).

4. Tool device (10) according to one of the preceding claims, characterized in that the connecting unit (14) comprises at least one device interface (22) for connection to the hand-held power tool (12) and at least one tool fastening (24) projecting away from the device interface (22) and to which the tool unit (16) is fastened, wherein a maximum extension of the tool fastening (24) from the device interface (22) to the tool unit (16) is at least less than 45% of a maximum extension of the device interface (22).

5. Tool device (10) according to one of the preceding claims, characterized in that the connecting unit (14) and the tool unit (16) are arranged at least substantially flush with one another in a direction perpendicular to the main extension plane on the main connecting surface (18).

6. Tool device (10) according to one of the preceding claims, characterized by a maximum immersion depth (26) into the workpiece which is at least substantially equal to or greater than a maximum radial extent (28) of the tool unit (16).

7. Tool device (10) according to one of the preceding claims, characterized in that the tool unit (16) comprises at least one blade element (30) for machining the workpiece.

8. Hand tool (12) with an oscillating drive and with a tool device (10) connectable to the drive according to one of the preceding claims.

9. Method (32) for producing a tool device (10) according to one of claims 1 to 7.

10. The method (32) according to claim 9, wherein the tool unit (16) and the connecting unit (14) are butt-welded together.

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