Cutting device fastening device, cutting device and mower

Abstract

The utility model relates to a cutting element fastening device (10a-10e) for a cutting device (12a-12e), in particular a lawn mower, preferably an automatic lawn mower, having a support unit (16a-16e) for rotatably supporting a cutting element (18a-18e) of the cutting device about an axis of rotation (20a-20e), the bearing surface (22a-22e) of the bearing unit has a bearing surface portion (26a-26e) which is angled in the axial direction (24a-24e) with respect to the axis of rotation. It is proposed that the ratio of the maximum longitudinal extent (32a-32e) of the angled bearing surface portion (26a-26e) parallel to the axis of rotation (20a-20e) to the maximum longitudinal extent (30a-30e) of the bearing surface (22a-22e) parallel to the axis of rotation (20a-20e) is at least 0.30. The utility model further relates to a cutting device and a mower.

Description

Technical Field

[0001] This application relates to a fastening device for a cutting device. Furthermore, this application relates to a cutting device and a lawnmower. Background Technology

[0002] A cutting element fastening device for a cutting apparatus has been proposed, the cutting element fastening device having a support unit for supporting the cutting element of the cutting apparatus rotatably about a rotation axis, wherein the support surface of the support unit has a support surface portion that is angled relative to the rotation axis in the axial direction. Utility Model Content

[0003] This application relates to a cutting device fastening device for a cutting device, particularly for a lawnmower, preferably for an automatic lawnmower, having a support unit for supporting the cutting element of the cutting device rotatably about a rotation axis, wherein the support surface of the support unit has a support surface portion that is angled relative to the rotation axis in the axial direction.

[0004] It is proposed that the ratio of the maximum longitudinal extension dimension of the angled support surface portion parallel to the axis of rotation to the maximum longitudinal extension dimension of the support surface parallel to the axis of rotation is at least 0.30, preferably at least 0.5, more preferably at least 0.7, and particularly preferably at least 0.9.

[0005] The configuration of the cutting device fastening device of this application achieves a particularly high level of user comfort. Advantageously, the cutting element can be fixed in a defined position in at least one operating state. Advantageously, undesirable axial movement with respect to the rotation axis of the cutting element can be prevented. Advantageously, clicking sounds from the cutting element during operation of the cutting device can be prevented. Advantageously, the generation of unwanted noise can be prevented. A particularly comfortable user experience can be achieved.

[0006] The cutting device fastening device is preferably constructed as a single part, two parts, or three parts. Alternatively, it can be considered that the cutting device fastening device consists of more than three parts. In particular, in at least one configuration, the cutting device fastening device preferably has two fastening elements. The support unit is preferably composed of one of the two fastening elements. The fastening element is preferably configured for fastening, in particular, directly, to the cutter head of the cutting device. It can be considered that the fastening element can be fastened to the cutter head in a detachable manner. In this context, "detachable" is particularly understood to mean "separable without damage". However, alternatively, it can also be considered that the fastening element is at least partially integral with the cutter head. "At least one unit or object and at least one other unit or object are at least partially integral with each other" should be understood in particular to mean that at least one element of the unit or object is integral with at least one other element of the other unit or object. "Integral" can be understood as at least a material-locking connection, such as by fusion welding, brazing, bonding, injection molding, and / or other processes that are meaningful to those skilled in the art, and / or advantageously as being formed into a single part, such as by manufacturing from a casting and / or by a single-component or multi-component injection molding process, and advantageously manufactured from a single blank. It can also be considered, particularly in the first configuration, that the cutter head is part of the cutting device fastening mechanism.

[0007] The fastening device for the cutting device preferably includes a stop element. The stop element is particularly configured to axially secure the cutting element about the axis of rotation. In at least one configuration, the stop element is preferably composed of the other of two fastening elements. This fastening element and the other fastening element are preferably detachably connected to each other, particularly fastened to each other, for example by means of screws, locking mechanisms, clamping connections, bayonet connections, etc. In particular, in at least one configuration, the other fastening element is constructed as a screw, preferably a bolt, or a stud.

[0008] The support unit has at least one support element. It is also possible that the support unit has two or more support elements. The support surface is formed by at least one support element. It is also possible that the support element is constructed separately from the fastening element and / or another fastening element. Alternatively, it is also possible that the support element is constructed integrally with the fastening element or the other fastening element.

[0009] Alternatively, particularly in at least one additional configuration of the cutting device fastening device, it may be considered that the cutting device fastening device has only one fastening element, wherein the stop element and / or support unit is particularly constituted by the fastening element. Preferably, in at least one additional configuration, the support unit and the stop element are constructed as one unit. Preferably, in at least one additional configuration, the fastening element is constructed as a screw, preferably as a bolt, or as a stud.

[0010] The cutting element is preferably constructed as a cutting blade, particularly as a lawnmower cutting blade. The cutting element preferably has a fixed slot. The support unit is preferably arranged in the fixed slot while the cutting element is mounted on the cutting device by means of a cutting device fastening device. The stop element preferably has a stop surface, on which the cutting element preferably rests in a planar manner, preferably axially, in its fixed position. The main extending plane of the stop surface preferably extends at least substantially perpendicular to the axis of rotation. The "main extending plane" of a structural unit or element can be understood as a plane parallel to the largest side of the smallest possible imaginary cube, particularly passing through the center point of the cube, which just completely encloses the structural unit. "Substantially perpendicular" can be understood as an orientation of a direction relative to a reference direction, wherein the direction and the reference direction, particularly when viewed in the projection plane, enclose an angle of 90°, which has a maximum deviation particularly less than 8°, advantageously less than 5°, and particularly advantageously less than 2°.

[0011] "Settings" should be understood as specially configured, specially designed, and / or specially equipped. "An object is set to determine a function" should be understood as the object satisfying and / or performing the determined function in at least one application state and / or operating state.

[0012] The angled support surface portion may have at least a straight orientation and / or at least a curved orientation. The support surface extends from the stop element, particularly from the stop surface, to the end of the angled support surface portion of the support surface that is farther away from the stop element. It is conceivable that the support surface is entirely composed of the angled support surface portion. The angled support surface portion is parallel to the axis of rotation, defining the support surface on at least one side, particularly on both sides in at least one configuration.

[0013] The maximum extension of the support surface parallel to the axis of rotation preferably extends from the stop element, especially the stop surface, through the angled support surface portion to the end of the angled support surface portion. Preferably, especially in at least one configuration, the distance from the angled support surface portion to the stop element, parallel to the axis of rotation, preferably to the stop surface, parallel to the axis of rotation, is less than the thickness of the cutting element, preferably at least less than the thickness of the cutting element in the region of the fixed slot.

[0014] Furthermore, it is proposed that the support unit, particularly by means of an angled support surface portion, is configured to move the cutting element in at least one driving state with an axial force about the axis of rotation toward a fixed position, wherein the cutting element has at least one contact portion with the angled support surface portion in the fixed position. This allows for particularly effective and / or reliable fixation of the cutting element. Advantageously, it can particularly reliably prevent the generation of undesirable noise due to clicking sounds from the cutting element in at least one driving state. Preferably, the cutting device, particularly the cutter head, rotates about a drive axis in at least one driving state. The drive axis preferably extends at least substantially perpendicular to the main extension plane of the cutter head and / or through the geometric center point of the cutter head. The drive axis extends, in particular, at least substantially parallel to the axis of rotation, and is preferably arranged offset from the axis of rotation. "Substantially parallel" here can be understood as an orientation of a direction relative to a reference direction, particularly an orientation in a plane, wherein this direction has a deviation of particularly less than 8°, advantageously less than 5°, and particularly advantageously less than 2° relative to the reference direction. At least one cutting element is configured to press against the support unit, preferably against an angled support surface portion, around the drive axis, particularly by the action of a cutting device, preferably a cutter head, in the at least one driving state, preferably radially outward about the drive axis, preferably with the surface of the cutting element's defined slot, and preferably against the support unit. It is conceivable that the fixed position is defined by a stop element, preferably by a stop surface, wherein the cutting element preferably stops in this fixed position, particularly abutting against the stop element, particularly the stop surface. However, alternatively, it is also conceivable that the fixed position is defined solely by the orientation of the angled support surface portion, independent of the stop element. It is also conceivable that the cutting element, in this fixed position in at least one driving state, has two contact portions with the angled support surface portion.

[0015] Furthermore, it is proposed that the angled support surface portion has an angle of at least 20° and a maximum of 60° relative to the axis of rotation. Advantageously, this allows for particularly effective and / or reliable positioning of the cutting element. It can particularly effectively and / or reliably prevent noise generation due to the clicking sound of the cutting element in at least one driving state. Preferably, the angle is at least 30°. Preferably, the angle is a maximum of 50°, more preferably a maximum of 40°. Particularly preferably, the angle is at least substantially 35°. In this context, "a parameter at least substantially corresponds to a pre-given value" should be understood in particular to mean that the deviation from the pre-given value is particularly less than 25%, preferably 10%, particularly preferably 5% of the pre-given value.

[0016] Furthermore, it is proposed that the support surface be constructed in a wedge or concave shape, especially a C-shape or U-shape, particularly through an angled support surface portion. Advantageously, positioning of the cutting element with particularly low friction can be achieved. Tilt and / or impact of the cutting element can be prevented particularly effectively. Noise generation due to clicking sounds from the cutting element can be prevented particularly effectively and / or reliably in at least one driving state.

[0017] Furthermore, it is proposed that the fixed position is arranged axially spaced apart from at least one end, preferably from the two ends of the support surface. Advantageously, positioning of the cutting element with particularly low friction can be achieved. Tilt and / or impact of the cutting element can be prevented particularly effectively. Noise generation due to clicking of the cutting element in at least one driving state can be prevented particularly effectively and / or reliably. Preferably, the angled portion of the support surface is spaced apart from the end of the support surface and / or from the stop element, which is the stop surface.

[0018] Furthermore, it is proposed that the cutting device fastening device has a stop element, particularly the aforementioned stop element, on which the cutting element, in a fixed position, is particularly surface-mounted, wherein the cutting element, in the fixed position and at least in a driving state, is loaded with an axial force toward the stop element, preferably the stop surface. Advantageously, this can support particularly secure contact of the cutting element with the stop element. It can particularly effectively and / or reliably prevent noise generation due to clicking sounds from the cutting element in at least one driving state. Preferably, the cutting element, in the fixed position, is abutted, particularly surface-mounted, against the stop surface, wherein, in particular, the cutting element, in the fixed position and at least in a driving state, is loaded with an axial force toward the stop element, preferably the stop surface.

[0019] Furthermore, it is proposed that at least a portion of the support unit is made of a material different from that constituting the stop element, particularly a non-ferrous metal, preferably brass. Advantageously, a particularly wear-resistant support unit can be provided. A particularly durable cutting device fastening device can be achieved. Advantageously, a support unit with particularly good sliding properties can be provided. Particularly reliable positioning of the cutting element in a fixed position can be achieved by means of the angled support surface portion. A cutting device fastening device with particularly advantageous support performance can be achieved, while simultaneously achieving particularly advantageous manufacturing costs. The stop element is made of, for example, iron or steel. However, alternatively, it is also conceivable that the stop element is made of another material that is meaningful to those skilled in the art. Preferably, at least one support element is made of a material different from that constituting the stop element, particularly a non-ferrous metal, preferably brass. However, alternatively, it is also conceivable that at least a portion of the support unit, particularly the support element and the stop element, is made of the same material.

[0020] Furthermore, it is proposed that at least one portion of the support unit, particularly the aforementioned portion, especially the at least one support element, is screwed onto the stop element. Advantageously, at least one portion of the support unit can be replaced particularly cost-effectively. The flexible replacement of this at least one portion of the support unit allows for particularly simple and / or cost-effective adaptation to different requirements, such as different cutting elements. Preferably, at least one portion of the support unit, especially the support element, can be screwed onto the stop element until it abuts against the stop surface of the stop element, or it can be screwed onto the stop element until it abuts against another support element. The stop element, especially another fastening element, preferably has threads, which are specifically designed to cooperate with the threads of the support element for fastening the support element to the stop element, preferably the fastening element. It is conceivable that the support surface is composed of two support elements, wherein one of these support elements can be screwed onto the stop unit. The support elements are preferably attached to each other in the assembled state, preferably to form a continuous support surface.

[0021] Furthermore, a cutting device, particularly the aforementioned cutting device, is proposed, having at least one cutting device fastening device and at least one cutting element. The configuration of the cutting device of this application allows for a particularly high level of user comfort. Advantageously, the cutting element can be fixed in a defined position in at least one operating state. Advantageously, undesirable axial movement with respect to the rotation axis of the cutting element can be prevented. Advantageously, clicking sounds from the cutting element during operation of the cutting device can be prevented. Advantageously, unwanted noise generation can be prevented. A particularly comfortable user experience can be achieved. Preferably, the cutting device has multiple cutting device fastening devices. Preferably, the cutting device has multiple cutting elements. Particularly preferably, the number of cutting device fastening devices corresponds to the number of cutting elements. The cutting device fastening devices are preferably arranged around a drive axis, preferably at the same distance from the drive axis. Preferably, the cutting device fastening devices are uniformly arranged around the drive axis. However, alternatively, it is also conceivable that the distance between the drive axis and the cutting device fastening devices is different and / or the cutting device fastening devices are non-uniformly arranged around the drive axis.

[0022] Furthermore, it is proposed that the cutting device has a cutter head, particularly the aforementioned cutter head, on which the cutting element can be fastened by means of a cutting device fastening device, wherein the stop surface of the cutting device fastening device, particularly a stop surface extending at least substantially perpendicular to the axis of rotation, preferably the aforementioned stop surface, is arranged on the end of the support surface away from the cutter head. Advantageously, particularly advantageous positioning of the cutting element can be achieved. Interference noise can be avoided particularly reliably by using the cutting element. Preferably, particularly in at least one embodiment, the fixed position is arranged on the end of the support surface away from the cutter head.

[0023] Furthermore, it is proposed that the minimum diameter of the fixing slot of the cutting element, especially the aforementioned fixing slot, is smaller than the maximum extension dimension of the stop surface. Advantageously, the cutting element can be connected to the cutter head in a way that prevents loss. A particularly high level of user safety can be achieved. The maximum extension dimension of the stop surface is preferably measured in a plane extending parallel to the main extension plane of the stop surface.

[0024] Furthermore, a lawnmower with a cutting device, particularly the aforementioned cutting device, and especially an automatic lawnmower, is proposed. The configuration of the lawnmower of this application allows for a particularly high level of user comfort. Advantageously, the cutting element can be fixed in a defined position in at least one operating state. Advantageously, undesirable axial movement with respect to the axis of rotation of the cutting element can be prevented. Advantageously, clicking sounds from the cutting element during operation of the cutting device can be prevented. Advantageously, unwanted noise generation can be prevented. A particularly comfortable user experience can be achieved. The lawnmower can be configured as an automatic lawnmower and / or a manually guided lawnmower.

[0025] In this application, the cutting device fastening device, the cutting device, and / or the lawnmower should not be limited to the applications and embodiments described above. In particular, to achieve the functional modes described herein, the cutting device fastening device, the cutting device, and / or the lawnmower may have a different number than the various elements, components, and units described herein. Furthermore, the values ​​within the vertical range given in this disclosure are also considered public and can be applied arbitrarily. Attached Figure Description

[0026] Further advantages arise from the description of the following figures. Five embodiments of the present application are illustrated in the figures. The figures, description, and claims contain numerous combinations of features. Those skilled in the art will also examine these features individually and generalize them into other meaningful combinations.

[0027] It is shown that:

[0028] Figure 1 The lawnmower is shown in 3D.

[0029] Figure 2 Show in 3D Figure 1 The cutting device of the lawnmower is part of the cutting device, which has a cutting device fastening device and a cutting element;

[0030] Figure 3 Shown in cross-sectional view Figure 2 Cutting device fastening device and cutting element;

[0031] Figure 4The cutting device fastening device and cutting element in the first alternative configuration are shown in cross-section.

[0032] Figure 5 The cutting device fastening device and cutting element in the second alternative configuration are shown in cross-sectional view;

[0033] Figure 6 The cutting device fastening device and cutting element in the third alternative configuration are shown in cross-sectional view; and

[0034] Figure 7 The cutting device fastening device and cutting element in the fourth alternative configuration are shown in cross-section. Detailed Implementation

[0035] Figure 1 A lawnmower 14a is shown. The lawnmower 14a has a cutting device 12a. Here, the lawnmower 14a is exemplary constructed as an automatic lawnmower. Alternatively, the lawnmower 14a can be constructed as a manually guided lawnmower.

[0036] The cutting device 12a has multiple cutting device fastening devices 10a and multiple cutting elements 18a (see...). Figure 2 In the accompanying drawings of this embodiment a, only one of the multiple cutting elements 18a and one of the multiple cutting device fastening devices 10a are shown. The cutting device 12a has a cutter head 42a, on which the cutting element 18a can be fastened by means of the cutting device fastening device 10a.

[0037] exist Figure 3 The diagram exemplarily illustrates one of a plurality of cutting device fastening devices 10a and one of a plurality of cutting elements 18a. The cutting device fastening device 10a has a support unit 16a for supporting the cutting element 18a rotatably about a rotation axis 20a.

[0038] The cutting device fastening device 10a is constructed as two parts. However, alternatively, the cutting device fastening device 10a may be constructed as one part, three parts, or more than three parts. It is also conceivable that the cutter head 42a is part of the cutting device fastening device 10a.

[0039] The cutting device fastening device 10a has two fastening elements 52a and 54a. The support unit 16a is composed of one of the two fastening elements 52a and 54a, fastening element 52a. The support unit 16a has a support element 60a. The support element 60a is composed of the fastening element 52a.

[0040] The fastening element 52a is configured for direct fastening, in particular, to the cutter head 42a. It is conceivable that the fastening element 52a can be fastened to the cutter head 42a in a detachable manner. However, alternatively, it is also conceivable that the fastening element 52a is at least partially integrated with the cutter head 42a. It is also conceivable that the cutter head 42a is part of the cutting device fastening device 10a.

[0041] Support unit 16a has a support surface 22a. Support element 60a has a support surface 22a. Support surface 22a has a support surface portion 26a that is angled relative to the rotation axis 20a in the axial direction 24a. Support element 60a has the angled support surface portion 26a.

[0042] The ratio of the maximum longitudinal extension dimension 32a of the angled support surface portion 26a parallel to the rotation axis 20a to the maximum longitudinal extension dimension 30a of the support surface 22a parallel to the rotation axis 20a is at least 0.30. The support surface 22a is entirely composed of the angled support surface portion 26a.

[0043] The cutting device fastening device 10a has a stop element 40a. The stop element 40a is configured to axially fix the cutting element 18a in an axial direction 24a with respect to the rotation axis 20a. The cutter head 42a and / or the fastening element 52a are configured to axially fix the cutting element 18a in another axial direction 56a with respect to the rotation axis 20a. The other axial direction 56a is opposite to the axial direction 24a.

[0044] The stop element 40a is composed of the other fastening element 54a, one of the two fastening elements 52a and 54a. The fastening elements 52a and 54a can be detachably connected to each other, particularly fastened to each other, for example by means of screw connection, locking connection, clamping connection, bayonet connection, etc. The other fastening element 54a has a screw-like structure, preferably a screw.

[0045] The cutting element 18a has a fixed slot 48a. The support unit 16a is arranged in the fixed slot 48a when the cutting element 18a is mounted on the cutting device 12a by means of the cutting device fastening device 10a. The stop element 40a has a stop surface 44a. The cutting element 18a rests against, preferably surface-to-surface against, the stop surface 44a in its fixed position (see...). Figure 3 The main extension plane of the stop surface 44a extends at least substantially perpendicular to the axis of rotation 20a.

[0046] The minimum diameter 46a of the fixing slot 48a of the cutting element 18a is smaller than the maximum extension dimension 50a of the stop surface 44a. The maximum extension dimension 50a of the stop surface 44a is measured in a plane parallel to the main extension plane of the stop surface 44a.

[0047] The angled support surface portion 26a has a straight orientation. The support surface 22a extends from the stop element 40a, and especially from the stop surface 44a, to the end of the angled support surface portion 26a that is away from the stop element 40a, and especially from the stop surface 44a. The stop surface 44a is constructed with the screw head of another fastening element 54a configured as a screw.

[0048] The distance from the angled support surface portion 26a to the stop element 40a, especially to the stop surface 44a, parallel to the rotation axis 20a, is less than the thickness of the cutting element 18a, preferably at least less than the thickness of the cutting element 18a in the region of the fixed slot 48a.

[0049] The support unit 16a, in particular by means of the angled support surface portion 26a, is configured to move the cutting element 18a in at least one driving state with a force acting axially about the rotation axis 20a toward a fixed position, wherein the cutting element 18a has at least one contact portion 34a with the angled support surface portion 26a in the fixed position.

[0050] The cutting device 12a, particularly the cutter head 42a, rotates about a drive axis (not shown) in at least one driving state. The drive axis extends at least substantially perpendicular to the main extension plane of the cutter head 42a and / or extends through the geometric center point of the cutter head 42b. The drive axis extends at least substantially parallel to the rotation axis 20a. The drive axis is arranged offset from the rotation axis 20a. The cutting element 18a is configured to be pressed against the support unit 16a, preferably against the angled support surface portion 26a, about the drive axis by a centrifugal force acting radially outward about the drive axis in at least one driving state, particularly due to the drive of the cutting device 12a, preferably the cutter head 42a.

[0051] The angled support surface portion 26a has an angle 36a of at least 20° and a maximum of 60° with respect to the axis of rotation 20a. For example, the angle 36a is 35°.

[0052] The cutting element 18a is in a fixed position, particularly in a surface-mounted manner, abutting against the stop element 40a, particularly the stop surface 44a. In the fixed position, the cutting element 18a is loaded with an axial force in at least one driving state towards the stop element 40a, particularly the stop surface 44a.

[0053] The stop surface 44a of the cutting device fastening device 10a is arranged on the end 38a of the support surface 22a, which is away from the cutter head 42a. The stop surface 44a extends at least substantially perpendicular to the rotation axis 20a. The stop surface 44a is arranged on the end 38a of the support surface 22a, which is away from the cutter head 42a.

[0054] Figures 4 to 7 Four other embodiments of this application are illustrated below. The following description and drawings are essentially limited to the differences between the embodiments, wherein, in principle, reference may also be made to other embodiments for components with the same names, especially components with the same reference numerals. Figures 1 to 3 The accompanying drawings and / or description of the embodiments are provided. To distinguish the embodiments, in... Figures 1 to 3 In the figures, the letter 'a' is placed after the reference numerals in the embodiments. Figures 4 to 7 In the embodiment, the letter 'a' is replaced by letters 'b' through 'e'.

[0055] Figure 4 A portion of a cutting apparatus 12b with a cutting device fastening device 10b and a cutting element 18b is shown. The cutting device fastening device 10b has a support unit 16b for supporting the cutting element 18b rotatably about a rotation axis 20b.

[0056] Support unit 16b has a support surface 22b. Support surface 22b has a support surface portion 26b that is angled relative to the rotation axis 20b in the axial direction 24b. Support unit 16b has two support elements 60b and 62b. Exemplarily, one of the two support elements 60b and 62b, support element 60b, has the angled support surface portion 26b. Exemplarily, the other support element 62b has a cylindrical support surface portion 58b. This other support element 62b is integrally constructed with the stop element 40b of the cutting device fastening device 10b, and in particular, the fastening element 52b of the cutting device fastening device 10b. Support surface 22b is composed of two support elements 60b and 62b, and in particular, of the cylindrical support surface portion 58b and the angled support surface portion 26b.

[0057] The ratio of the maximum longitudinal extension dimension 30b of the angled support surface portion 26b parallel to the rotation axis 20b to the maximum longitudinal extension dimension 32b of the support surface 22b parallel to the rotation axis 20b is at least 0.30.

[0058] The fastening element 52b is configured for direct fastening to the cutter head 42b of the cutting device 12b, exemplarily fastened by means of a screw connection. The fastening element 52b has threads. The cutter head 42b has threads. The threads of the fastening element 52b are configured for fastening to the cutter head 42b to cooperate with the threads of the cutter head 42b.

[0059] At least a portion of the support unit 16b is made of a material, particularly a non-ferrous metal, preferably brass, different from the material of the stop element 40b constituting the fastening device 10b of the cutting device. The support element 60b is made of a material, particularly a non-ferrous metal, preferably brass, different from the material of the stop element 40b constituting the fastening device 10b of the cutting device. The fastening element 52b has the stop element 40b. The stop element 40b is constituted by the fastening element 52b. The fastening element 52b is exemplarily constructed as a screw. The fastening element 52b, especially the stop element 40b, is made of, for example, steel or iron. However, alternatively, the support unit 16b and the stop element 40b may be made of the same material.

[0060] At least a portion of the support unit 16b, particularly the support element 60b, is screwed onto the stop element 40b. The support unit 16b, particularly the support element 60b, has threads. A portion of the support unit 16b, particularly the support element 60b, can be screwed onto the stop element 40b via the threads of the fastening element 52b. The threads of the support element 60b are configured for fastening onto the stop element 40b, particularly onto the fastening element 52b, to cooperate with the threads of the fastening element 52b. A cylindrical support surface portion 58b, viewed in the axial direction 24b, is arranged between the angled support surface portion 26b and the stop surface 44b of the stop element 40b. The end of the angled support surface portion 36b that is away from the stop surface 44b (particularly viewed parallel to the axis of rotation 20b) defines a support surface 22b at one end. The cylindrical support surface portion 58b, at its closest end relative to the stop surface 44b (especially when viewed parallel to the axis of rotation 20b), defines the support surface 22b at the other end.

[0061] Figure 5 A portion of a cutting apparatus 12c with a cutting device fastening device 10c and a cutting element 18c is shown. The cutting device fastening device 10c has a support unit 16c for supporting the cutting element 18c rotatably about a rotation axis 20c.

[0062] The support unit 16c has a support surface 22c. The support surface 22c has a support surface portion 26c that is angled relative to the rotation axis 20c in the axial direction 24c.

[0063] The ratio of the maximum longitudinal extension dimension 30c of the angled support surface portion 26c parallel to the rotation axis 20c to the maximum longitudinal extension dimension 32c of the support surface 22c parallel to the rotation axis 20c is at least 0.30.

[0064] The cutting device fastening device 10c has a fastening element 52c. The support unit 16c is composed of the fastening element 52c. The stop element 40c is composed of the fastening element 52c. The fastening element 52c is directly fastened to the cutter head 42c of the cutting device 12c.

[0065] The support surface 22c has a cylindrical support surface portion 58c. The cylindrical support surface portion 58c is arranged between the angled support surface portion 26c and the stop surface 44c when viewed along the axial direction 24c. The support surface 22c consists of the angled support surface portion 26c and the cylindrical support surface portion 58c.

[0066] Figure 6 A portion of a cutting apparatus 12d with a cutting device fastening device 10d and a cutting element 18d is shown. The cutting device fastening device 10d has a support unit 16d for supporting the cutting element 18d rotatably about a rotation axis 20d.

[0067] Support unit 16d has a support surface 22d. Support surface 22d has a support surface portion 26d that is angled relative to the rotation axis 20d in the axial direction 24d. The ratio of the maximum longitudinal extension dimension 32d of the angled support surface portion 26d parallel to the rotation axis 20d to the maximum longitudinal extension dimension 30d of the support surface 22d parallel to the rotation axis 20d is at least 0.30.

[0068] The fixed position is spaced apart from the ends 28d and 38d of the support surface 22d along the axial direction 24d. The fixed position of the cutting element 18d is defined independently of the stop element 40d of the cutting device fastening device 10d. In the fixed position, the cutting element 18d is spaced apart from the stop element 40d, especially from the stop surface 44d of the stop element 40d. The fixed position is defined only by the orientation of the angled support surface portion 26d. In the fixed position, the cutting element 18d has two contact portions 34d with the angled support surface portion 26d in at least one driving state. The support surface 22d is concave, especially C-shaped. The support surface 22d is entirely composed of the angled support surface portion 26d. The angled support surface portion 26d has a curved orientation.

[0069] The cutting device fastening device 10d has a fastening element 52d. The stop element 40d and the support unit 16d are composed of the fastening element 52d.

[0070] Figure 7 A portion of a cutting device 12e with a cutting device fastening device 10e and a cutting element 18e is shown. The cutting device fastening device 10e has a support unit 16e for rotatably supporting the cutting element 18e about a rotation axis 20e.

[0071] The support unit 16e has a support surface 22e. The support surface 22e has a support surface portion 26e that is angled relative to the rotation axis 20e along the axial direction 24e.

[0072] The ratio of the maximum longitudinal extension dimension 32e of the angled support surface portion 26e parallel to the rotation axis 20e to the maximum longitudinal extension dimension 30e of the support surface 22e parallel to the rotation axis 20e is at least 0.30.

[0073] The support surface 22e is wedge-shaped. The support surface 22e is entirely composed of angled support surface portions 26e. The angled support surface portions 26e are composed of two straight support surface segments extending at an angle to each other. The cutting element 18e has two contact portions 34e with the angled support surface portions 26e in a fixed position.

[0074] The cutting device fastening device 10e has a fastening element 52e. The stop element 40e and the support unit 16e are composed of the fastening element 52e.

Claims

1. A cutting element fastening device for a cutting apparatus, the cutting element fastening device having a support unit for supporting the cutting element of the cutting apparatus (12a-12e) rotatably about a rotation axis, wherein, The support surface of the support unit has a support surface portion that is angled relative to the axis of rotation in the axial direction, characterized in that the ratio of the maximum longitudinal extension dimension of the angled support surface portion parallel to the axis of rotation to the maximum longitudinal extension dimension of the support surface parallel to the axis of rotation is at least 0.

30.

2. The cutting device fastening device according to claim 1, characterized in that, The support unit is configured to move the cutting element in at least one driving state toward a fixed position with an axial force about the axis of rotation, wherein the cutting element has at least one contact portion (34a-34e) in the fixed position with respect to the angled support surface portion.

3. The cutting device fastening device according to claim 1 or 2, characterized in that, The angled support surface portion has an angle (36a) of at least 20° and at most 60° relative to the axis of rotation.

4. The cutting device fastening device according to claim 1 or 2, characterized in that, The support surface is wedge-shaped or concave.

5. The cutting device fastening device according to claim 2, characterized in that, The fixed positions are arranged spaced apart in the axial direction from at least one end of the support surface.

6. The cutting device fastening device according to claim 2, characterized in that, A stop element is provided, and the cutting element abuts against the stop element in the fixed position, wherein the cutting element in the fixed position is loaded in the direction of the axially acting force in the at least one driving state.

7. The cutting device fastening device according to claim 6, characterized in that, At least a portion of the support unit is made of a material different from the material constituting the stop element.

8. The cutting device fastening device according to claim 6 or 7, characterized in that, At least one part of the support unit is screwed onto the stop element.

9. The cutting device fastening device according to claim 1 or 2, characterized in that, The cutting device (12a-12e) is a lawnmower (14a).

10. The cutting device fastening device according to claim 9, characterized in that, The lawnmower (14a) is an automatic lawnmower.

11. The cutting device fastening device according to claim 2, characterized in that, The support unit is configured, by means of the angled support surface portion, to move the cutting element in at least one driving state with an axial force about the axis of rotation toward a fixed position.

12. The cutting device fastening device according to claim 4, characterized in that, The concave shape is C-shaped or U-shaped.

13. The cutting device fastening device according to claim 5, characterized in that, The fixed positions are arranged spaced apart from the two ends of the support surface in the axial direction.

14. The cutting device fastening device according to claim 6, characterized in that, The cutting element is abutted against the stop element in the fixed position.

15. The cutting device fastening device according to claim 7, characterized in that, At least a portion of the support unit is made of non-ferrous metal.

16. The cutting device fastening device according to claim 15, characterized in that, The non-ferrous metal is brass.

17. A cutting device, characterized in that, The cutting device (12a-12e) has at least one cutting device fastening device according to any one of claims 1 to 16 and at least one cutting element.

18. The cutting device according to claim 17, characterized in that, A cutter head (42a-42e) is provided, and the cutting element can be fastened to the cutter head by means of the cutting device fastening device (10a-10e), wherein the stop surface of the cutting device fastening device (10a-10e) is arranged on the end of the support surface that is away from the cutter head (42a-42e).

19. The cutting device according to claim 18, characterized in that, The minimum diameter (46a) of the fixing slot (48a) of the cutting element is smaller than the maximum extension dimension (50a) of the stop surface.

20. The cutting device according to claim 18, characterized in that, The stop surface extends perpendicular to the axis of rotation.

21. A lawnmower, characterized in that, The lawnmower has a cutting device (12a-12e) according to any one of claims 17 to 20.

22. The lawnmower according to claim 21, characterized in that, The lawnmower (14a) is an automatic lawnmower.

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