Edge trimming tool assembly and power tool

Abstract

An edge trimming tool assembly (1) configured to cut vegetation around an edge structure (50) is disclosed. The assembly (1) comprises a drive shaft (3) and a trimming tool (5) configured to be rotated by the drive shaft (3) about an axis of rotation (ax) such that a radially outer portion (5) of the trimming tool (5) is orbitally moved on a circular path (c). The assembly (1) comprises a shield (7) comprising a first shield portion (11) covering a portion of the area (A) formed within the circular path (c) when viewed in a first direction (d1) parallel to the rotation axis (ax) and a second shield portion (12) covering a portion of the area (A) formed within the circular path (c) when viewed in a second direction (d2) parallel to the rotation axis (ax). The second guard portion covers a portion of the area (A), where the second direction (d2) is opposite the first direction (d1). The present disclosure also relates to a power tool (2) comprising the edge trimming tool assembly (1).

Description

Technical Field

[0001] The present disclosure relates to an edge trimming tool assembly configured to cut vegetation around an edge structure. The present disclosure also relates to a power tool including the edge trimming tool assembly. Background Art

[0002] A trimmer device (also known as a string trimmer, line trimmer, and brush cutter) is a power tool used to cut grass and other types of vegetation. A trimmer device includes a trimming tool having a trimming line that rotates fast enough so that the centripetal force acting on the trimming line stiffens the trimming line, allowing the trimming line to cut vegetation as the trimming tool rotates. The trimming tool may be rotated, for example, using an electric motor or an internal combustion engine.

[0003] The trimmer device is usually designed to be held so that the trimming line moves along the track in a substantially horizontal plane during operation. In addition, the trimmer device usually includes a guard covering the top side of the trimming tool to prevent cutting residues and other types of objects and particles from flying from the trimmer device during use of the trimmer device.

[0004] There are some general issues when designing power tools, such as trimmer devices. One issue is ergonomics. That is, it is advantageous if a user can use a trimmer device in an easy ergonomic way. Another issue is user-friendliness. That is, it is advantageous if a trimmer device is designed so that it can be used in an easy and intuitive way. Another issue is the cutting result, which can be defined as the uniformity of the cut, where uniformity of the cut can be defined as the uniformity of the length of the cut vegetation, i.e. if the vegetation of an area is cut to a uniform length.

[0005] Another issue is safety. That is, a trimmer device is preferably designed so that it can be used in a safe manner. However, typically, a powerful motor is required to rotate the trimmer tool, and a high rotational speed is often required to allow the trimmer tool to cut vegetation, which can make it difficult to obtain a trimmer that is safe to use, at least for some specific tasks.

[0006] One of the challenging tasks to perform with a trimmer device is cutting vegetation around an edge structure comprising a substantially vertical cross-section. One example of such an edge structure is an edge structure surrounding a bunker on a golf course.

[0007] Currently, some users use trimmer devices of the type described above when trimming such edge structures and hold the trimmer device in an unintended operating position in which the trimming line moves along a track in a substantially vertical plane. Such operation can be dangerous to the user and bystanders, is not ergonomic, and can result in uneven cutting results.

[0008] In addition, some users (e.g., golf course superintendents at golf courses) convert different tools that can help them perform edge trimming in a proper manner. Those converted products are not developed by professionals for such use. In addition, they are often not ergonomically sound and the cutting results may be uneven. Furthermore, products converted for another purpose than the intended one may pose a danger to the user and bystanders.

[0009] Furthermore, it would generally be advantageous if products such as power tools and related components had conditions and / or properties suitable for manufacture and assembly in a cost-effective manner. Summary of the invention

[0010] It is an object of the present invention to overcome or at least alleviate at least some of the above mentioned problems and disadvantages.

[0011] According to a first aspect of the present invention, the object is achieved by an edge trimming tool assembly configured to cut vegetation around an edge structure. The assembly includes a drive shaft and a trimming tool connected to the drive shaft. The trimming tool is configured to rotate around a rotation axis by the drive shaft so that a radially outer portion of the trimming tool orbits along a circular path in a rotation plane. The assembly includes a guard member, the guard member including a first guard portion and a second guard portion, the first guard portion covering a portion of an area formed within the circular path as seen in a first direction parallel to the rotation axis, and the second guard portion covering a portion of the area as seen in a second direction parallel to the rotation axis, wherein the second direction is opposite to the first direction.

[0012] Since the guard of the pruning tool assembly comprises a first guard part and a second guard part, each guard part covering a part of the area as seen in a respective direction parallel to the axis of rotation, a pruning tool assembly is provided which has conditions for cutting vegetation around edge structures in a simple, ergonomic and safer manner, while providing conditions for improving the cutting results.

[0013] This is because one of the first guard part and the second guard part can be moved along a substantially vertical cross-section of the edge structure, thereby ensuring a predetermined distance between the rotation plane of the pruning tool and the edge structure. By ensuring a predetermined distance between the rotation plane of the pruning tool and the edge structure, the cutting result, i.e. the uniformity of the cutting, can be improved. In addition, a pruning tool assembly is provided that requires less skill from the user to obtain a more uniform cutting result around the edge structure. In other words, a pruning tool assembly is provided in which the skill of the user has a reduced influence on the cutting result.

[0014] Furthermore, since the first guard portion and the second guard portion of the guard of the pruning tool assembly each cover a portion of the area as seen in respective directions parallel to the rotation axis, a pruning tool assembly is provided that allows safer and more ergonomic operation of the pruning tool assembly while holding the pruning tool so that a radially outer portion of the pruning tool orbits in a substantially vertical rotation plane.

[0015] Therefore, a pruning tool assembly is provided which overcomes or at least mitigates at least some of the above problems and disadvantages. As a result, the above objects are achieved.

[0016] Optionally, each of the first guard portion and the second guard portion covers more than 30% or more than 50% of the area as seen in the respective first and second directions. Thus, a pruning tool assembly is provided having provisions for cutting vegetation around edge structures in a simple, ergonomic and safer manner while providing provisions for improving cutting results.

[0017] Optionally, each of the first guard portion and the second guard portion overlaps at least 70% of the other of the first guard portion and the second guard portion as seen along the respective first and second directions. Thus, a pruning tool assembly is provided having provisions for cutting vegetation around edge structures in a simple, ergonomic and safer manner while providing provisions for improving cutting results.

[0018] Optionally, the pruning tool comprises a tubular elongated support column, wherein the drive shaft is arranged inside the tubular elongated support column and comprises a connecting portion for connecting the output shaft of the power unit to the drive shaft. Thus, a pruning tool assembly is provided that has the conditions for use with a power unit in a simple, safe, ergonomic and intuitive manner.

[0019] Optionally, the guard is attached to an attachment section of the tubular elongated support column, and wherein the angle between the rotational plane and a vector directed from the attachment section to the connecting portion is in the range of 10 to 85 degrees, or in the range of 59 to 79 degrees. Thus, a pruning tool assembly is provided that allows for safer and more ergonomic operation of a pruning tool assembly, wherein the pruning tool is held in an orientation such that a radially outer portion of the pruning tool orbits in a substantially vertical rotational plane.

[0020] Optionally, the portion of the tubular elongated support column between the attachment section and the connecting portion is substantially straight. Thus, a pruning tool assembly is provided that has the benefit of being used with a power unit in a simple, safe, ergonomic and intuitive manner.

[0021] Optionally, the drive shaft is flexible and wherein the tubular elongated support column has a curved portion. Thus, a pruning tool assembly is provided having conditions for cutting vegetation around an edge structure in a simple, ergonomic and safe manner, while having conditions and characteristics suitable for manufacture and assembly in a cost-effective manner.

[0022] Optionally, the curved portion is arranged between the attachment section and the pruning tool. Thus, a pruning tool assembly is provided which has conditions for cutting vegetation around edge structures in a simple, ergonomic and safe manner, while having conditions and characteristics suitable for manufacturing and assembling in a cost-effective manner. Furthermore, a pruning tool assembly is provided which has conditions for being compact.

[0023] Optionally, each of the connecting portion and the first guard portion is arranged on a first side of the rotation plane.Therefore, a trimming tool assembly is provided which has provisions for cutting vegetation around an edge structure in a simple, ergonomic and safe manner.

[0024] Optionally, the cutting guard comprises a first edge portion arranged radially outside the pruning tool and wherein the first edge portion connects the first guard portion and the second guard portion. Thus, a pruning tool assembly is provided which has the conditions for cutting vegetation around the edge structure in an even safer manner. This is because the first edge portion prevents cutting residues and other types of objects and particles from being thrown from the pruning tool in a radial direction of the pruning tool.

[0025] Optionally, a tubular elongated support column is attached to the first edge portion. Thus, a pruning tool assembly is provided that has the conditions for cutting vegetation around an edge structure in a simple, ergonomic and safe manner, while having conditions and characteristics suitable for manufacturing and assembling in a cost-effective manner. In addition, a pruning tool assembly is provided that has the conditions for being rigid and durable.

[0026] Optionally, the first edge portion is arcuate with a radius of curvature in the range of 80% to 130% of the distance between the axis of rotation and the first edge portion. Thus, a pruning tool assembly is provided which has the conditions for cutting vegetation around an edge structure in a simple, ergonomic and safe manner while being compact and lightweight. Furthermore, a pruning tool assembly is provided in which the guard is less likely to get stuck, for example in vegetation, during operation.

[0027] Optionally, the arc length of the first edge portion is in the range of 50% to 500% of the distance between the rotation axis and the first edge portion, or in the range of 100% to 250% of the distance between the rotation axis and the first edge portion. Thus, a pruning tool assembly is provided that has provisions for cutting vegetation around an edge structure in an even safer manner. This is because the first edge portion prevents cutting residues and other types of objects and particles from the pruning tool from being splashed along a large part of the circumference of the circular path of the radially outer portion of the pruning tool.

[0028] Optionally, the guard comprises a second edge portion arranged opposite the first edge portion. Thus, a pruning tool assembly is provided which has the conditions for cutting vegetation around the edge structure in an even safer manner. This is because the second blade edge portion prevents cutting residues and other types of objects and particles from being splashed from the pruning tool in a radial direction of the pruning tool.

[0029] Optionally, the second edge portion connects the first guard portion and the second guard portion. Thus, a trimming tool assembly is provided which has provisions for cutting vegetation around an edge structure in an even safer manner.

[0030] Optionally, the second edge portion forms a ground engaging portion for maintaining a predetermined distance between the rotation axis and the ground by abutting contact against the ground. Thus, a pruning tool assembly is provided having provisions for cutting vegetation around an edge structure in an even simpler, more ergonomic and safer manner, while providing provisions for improving the cutting result. This is because the second edge portion can be used to maintain a predetermined distance between the rotation axis and the ground adjacent to a substantially vertical section of the edge structure, while one of the first guard portion and the second guard portion can be used to maintain a predetermined distance between the rotation plane of the pruning tool and the substantially vertical section of the edge structure.

[0031] In addition, since the second edge portion forms a ground engaging portion for maintaining a predetermined distance between the rotation axis and the ground, a trimming tool assembly is provided in which the splashing of objects and particles from the ground can be significantly reduced. As an example, when the trimming tool assembly according to embodiments herein is used to cut vegetation around an edge structure of a golf bunker, the second edge portion can be used to maintain a predetermined distance between the rotation axis and the sand surface of the bunker, thereby avoiding the splashing of sand during operation of the trimming tool assembly. Such splashing of sand can be dangerous to users and bystanders and can result in an undesirable transfer of sand from the bunker to an adjacent grass surface.

[0032] Optionally, the second edge portion is arcuate with a radius of curvature in the range of 80% to 130% of the distance between the axis of rotation and the second edge portion. Thus, a pruning tool assembly is provided which has the conditions for cutting vegetation around an edge structure in a simple, ergonomic and safe manner, while being compact and lightweight. Furthermore, a pruning tool assembly is provided in which the second guard portion is less likely to become stuck when moving over a surface such as the ground, the sand surface of a golf bunker, etc.

[0033] Optionally, the arc length of the second edge portion is in the range of 3% to 180% of the distance between the rotation axis and the second edge portion, or in the range of 25% to 90% of the distance between the rotation axis and the second edge portion. Thus, a trimming tool assembly is provided in which the second guard portion can be used to maintain a predetermined distance between the rotation axis and the ground in an effective manner.

[0034] Optionally, the guard surrounds the pruning tool in a plane parallel to the axis of rotation. Thus, a pruning tool assembly is provided that has the provision for cutting vegetation around edge structures in a simple, ergonomic and safer manner, while having the provision for a rigid and durable guard.

[0035] Optionally, the guard comprises a first aperture at a first side of a plane including the axis of rotation, and wherein the pruning tool has an effective radius greater than the distance from the axis of rotation to the edge of the first aperture. Thus, a pruning tool assembly is provided having provisions for cutting vegetation around an edge structure in a simple, effective, ergonomic and safe manner, the cutting being performed simply by moving the pruning tool assembly so that the first aperture at the first side of the plane moves towards the vegetation.

[0036] Optionally, the guard comprises a second aperture at the second side of the plane, and wherein the pruning tool has an effective radius greater than the distance from the axis of rotation to the edge of the second aperture. Thus, a pruning tool assembly is provided that has provisions for cutting vegetation around an edge structure in an even simpler, more efficient and more ergonomic manner. This is because the pruning tool assembly can be moved so that the first aperture at the first side of the plane or the second aperture at the second side of the plane is moved towards the vegetation.

[0037] Optionally, the pruning tool comprises a bevel gear assembly, and wherein the pruning tool is connected to the drive shaft via the bevel gear assembly. Thus, a pruning tool assembly is provided which has conditions for cutting vegetation around edge structures in a simple, ergonomic and safe manner, while having conditions and characteristics suitable for manufacturing and assembling in a cost-effective manner. In addition, a pruning tool assembly with compact conditions is provided.

[0038] According to a second aspect of the present invention, the object is achieved by a power tool comprising a power unit, which includes an output shaft and a motor configured to rotate the output shaft, wherein the power tool includes an edge trimming tool assembly according to some embodiments of the present disclosure, and wherein a drive shaft of the edge trimming tool assembly is connected to or connectable to the output shaft of the power unit.

[0039] Since the power tool according to some embodiments includes a trimming tool assembly, a power tool is provided having provisions for cutting vegetation around edge structures in a simple, ergonomic and safer manner, while providing provisions for improving the cutting results.

[0040] Furthermore, since the first guard portion and the second guard portion of the guard of the pruning tool assembly of the power tool each cover a portion of the area as seen in respective directions parallel to the rotation axis, a power tool is provided which allows safer and more ergonomic operation, wherein the pruning tool is held such that a radially outer portion of the pruning tool moves along an orbit in a substantially vertical rotation plane.

[0041] Therefore, a power tool is provided which overcomes or at least alleviates at least some of the above problems and disadvantages. As a result, the above objects are achieved.

[0042] Further features of, and advantages with, the present invention will become apparent when studying the appended claims and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Various aspects of the present invention, including its particular features and advantages, will be readily understood from the exemplary embodiments discussed in the following detailed description and accompanying drawings, in which:

[0044] Figure 1 A perspective view of a power tool according to some embodiments of the present disclosure is shown, wherein the power tool includes a power unit and a trimming tool assembly,

[0045] Figure 2 Shows Figure 1 An exploded view of some of the components of the trimming tool assembly is shown,

[0046] Figure 3 Shown along Figure 1 The second direction of observation shown Figure 1 The trimming tool assembly shown,

[0047] Figure 4 Shown along Figure 1 The first direction of observation shown Figure 1 The trimming tool assembly shown,

[0048] Figure 5 Shown is the edge structure held in the intended use position Figure 1 The trimming tool assembly shown,

[0049] Figure 6 Shown is a reference Figures 1 to 5 a second perspective view of the explained pruning tool assembly, and

[0050] Figure 7 Shown according to Figures 1 to 6 A cross section of a pruning tool, a gear assembly and a portion of a tubular elongated support post of a pruning tool assembly of the illustrated embodiment. DETAILED DESCRIPTION

[0051] Aspects of the present invention will now be described more fully. The same reference numerals represent the same elements throughout. For the sake of brevity and / or clarity, well-known functions or structures will not necessarily be described in detail.

[0052] Figure 1 A perspective view of a power tool 2 according to some embodiments of the present disclosure is shown. The power tool 2 includes a power unit 6, which includes an output shaft 4 and a motor 8 configured to rotate the output shaft 4. According to the embodiment shown, the motor 8 of the power unit 6 is an electric motor. According to other embodiments, the motor 8 of the power unit 6 can be an internal combustion engine.

[0053] According to the illustrated embodiment, the power unit 6 includes a handle portion 61, a safety switch 63, and an actuator 65, wherein each of the safety switch 63 and the actuator 65 is arranged at the handle portion 61 of the power unit 6. In addition, according to the illustrated embodiment, the power unit 6 includes a user interface 67 that allows the user to switch the power unit 6 between an activated state and a deactivated state. The user interface 67 may include an input unit, such as a button, a knob, etc., thereby allowing such a switch between the activated state and the deactivated state.

[0054] According to the illustrated embodiment, the power unit 6 includes a control device configured to activate the operation of the motor 8 when the power unit 6 is in an active state and each of the safety switch 63 and the actuator 65 is pressed, and thus activate the rotation of the output shaft 4 of the power unit 6. The drive shaft 4 of the power unit 6 is arranged in a tubular column 64 of the power unit 6. The outer surface of the tubular column 64 can be used as a second handle portion of the power unit 6.

[0055] The power tool 2 also includes an edge trimming tool assembly 1. As further explained herein, the edge trimming tool assembly 1 is specifically configured to cut vegetation around an edge structure. For the sake of brevity and clarity, the edge trimming tool assembly 1 is referred to as a "trimming tool assembly" or simply "assembly 1" in some places herein. Since the power tool 2 includes the trimming tool assembly 1, the power tool 2 as referred to herein may also be referred to as a trimmer device, an edge trimmer device, a lawn mower, a rope trimmer, a string trimmer, etc.

[0056] The pruning tool assembly 1 comprises a drive shaft 3 and a pruning tool 5 connected to the drive shaft 3. As further explained herein, the pruning tool 5 is configured to be rotated about a rotation axis by the drive shaft 3 so that a radially outer portion 5' of a pruning line of the pruning tool 5 performs an orbital motion along a circular path. According to the illustrated embodiment, the pruning tool assembly 1 comprises a tubular elongated support column 23, wherein the drive shaft 3 is arranged inside the tubular elongated support column 23. The pruning tool 5 may be any other type of pruning tool known in the art, such as a grass cutter.

[0057] According to the embodiment shown, the drive shaft 3 of the pruning tool assembly 1 is connectable to the output shaft 4 of the power unit 6. In more detail, according to the embodiment shown, the drive shaft 3 of the pruning tool assembly 1 includes a connecting portion 25 for connecting the output shaft 4 of the power unit 6 to the drive shaft 3. The power tool 2 may include a spline interface between the output shaft 4 of the power unit 6 and the connecting portion 25 of the drive shaft 3 of the pruning tool assembly 1. Furthermore, according to the embodiment shown, the power tool 2 includes a locking assembly 69 arranged on the tubular column 64 of the power unit 6 for locking the tubular column 64 against the tubular elongated support column 23 of the pruning tool assembly 1.

[0058] According to the embodiment shown, the pruning tool assembly 1 can be provided and sold as a separate unit intended for use with the power unit 6, for example according to Figure 1 The power unit 6 of the illustrated embodiment. However, the pruning tool assembly 1 according to the present disclosure may also be used with another type of power unit, for example a power unit comprising an internal combustion engine.

[0059] Furthermore, according to further embodiments, the power tool 2 as mentioned herein may be provided and sold as a separate unit, wherein the power tool 2 comprises a power unit 6 and a pruning tool assembly 1, wherein the drive shaft 3 of the pruning tool assembly 1 may be permanently connected to the output shaft 4 of the power unit 6. According to such an embodiment, the output shaft 4 of the power unit 6 and the drive shaft 3 of the pruning tool assembly 1 may be different parts of the same component.

[0060] Figure 2 Shows Figure 1 The exploded view of some parts of the trimming tool assembly 1 is shown. Figure 1 and Figure 2 .

[0061] According to the illustrated embodiment, the pruning tool assembly 1 comprises an elongated support column 23 in which the drive shaft 3 can be arranged. Furthermore, the pruning tool assembly 1 comprises a gear assembly 28, wherein the pruning tool 5 is connected to the drive shaft 3 via the gear assembly 28, as will be explained in further detail below.

[0062] Furthermore, the pruning tool assembly 1 comprises a guard 7. The guard 7 may also be referred to as a pruning guard or the like. The guard 7 comprises a first guard portion 11 covering a portion of the pruning tool 5 from a first side of a rotation plane of the radially outer portion 5' of the pruning tool 5. Furthermore, the guard 7 comprises a second guard portion 12 covering a portion of the pruning tool 5 from a second side of a rotation plane of the radially outer portion 5' of the pruning tool 5.

[0063] exist Figure 1 , a first direction d1 and a second direction d2 are indicated. The first direction d1 points to the first guard portion 11 of the guard 7 and is parallel to the rotation axis of the pruning tool 5. Likewise, the second direction d2 points to the second guard portion 12 of the guard 7 and is parallel to the rotation axis of the pruning tool 5. The second direction d2 is opposite to the first direction d1.

[0064] Figure 3 As shown along Figure 1 The second direction d2 indicated is viewed in the direction straight toward the second guard portion 12 of the guard member 7. Figure 1 The pruning tool assembly 1 is shown. Figure 3 In the figure, a portion of the tubular elongated support column 23 of the trimming tool assembly 1 has been omitted for the sake of brevity and clarity. Figure 3 In FIG. 5 , the rotation axis ax of the trimming tool 5 is indicated. As understood from the above, Figure 3 The viewing direction coincides with the direction of the rotation axis ax.

[0065] Below, unless otherwise specified, also refer to Figures 1 to 3As described above, the pruning tool 5 is configured to be rotated about the rotation axis ax by the drive shaft 3 so that the radially outer part 5' of the pruning tool 5 performs an orbital motion on a circular path c in a rotation plane. The rotation plane of the radially outer part 5' of the pruning tool 5 is perpendicular to the rotation axis of the pruning tool 5. According to the embodiment shown, the radially outer part 5' of the pruning tool 5 is the radially outer part 5' of the pruning line 51 of the pruning tool 5.

[0066] exist Figure 3 In FIG. 1 , the area A formed inside the circular path c is indicated. Figure 1 and Figure 3 As can be seen, the second guard portion 12 of the guard 7 covers a portion of the area A as seen in the second direction d2 parallel to the rotation axis ax.

[0067] Figure 4 As shown along Figure 1 The first direction d1 indicated is viewed in the direction straight toward the first guard portion 11 of the guard member 7. Figure 1 The pruning tool assembly 1 is shown. Figure 4 In the figure, a portion of the tubular elongated support column 23 of the trimming tool assembly 1 has been omitted for the sake of brevity and clarity. Figure 4 In FIG. 5 , the rotation axis ax of the pruning tool 5 is indicated. Figure 4 The viewing direction coincides with the direction of the rotation axis ax.

[0068] As in comparison Figure 1 and Figure 4 As can be seen, the first guard portion 11 of the guard 7 covers a portion of the area A formed within the circular path c, as seen in the first direction d1 parallel to the rotation axis ax. As mentioned herein, the area A formed within the circular path c may also be referred to as the area A surrounded by the circular path c of the radially outer portion 5 ' of the trimming tool 5.

[0069] Below, unless otherwise specified, also refer to Figures 1 to 4 The area A formed within the circular path c may be calculated by squaring the effective radius r of the pruning tool 5 and multiplying the squared effective radius r by π. The effective radius r may be an expected effective radius r of the pruning tool 5 and may correspond to a radius of a pruning line 51 of an expected length when stretched in a radial direction from the rotation axis ax of the pruning tool 5, the radius being measured in a radial direction from the rotation axis ax of the pruning tool 5 to a radially outer portion 5' of the pruning tool 5.

[0070] Since the guard 7 comprises the first guard part 11 and the second guard part 12, the trimming tool assembly 1 is provided with conditions for cutting vegetation around edge structures in a simple, ergonomic and safer manner, while providing conditions for improving the cutting results, as further explained herein.

[0071] Furthermore, since the first guard portion 11 and the second guard portion 12 of the guard 7 each cover a portion of the area A as seen in respective directions parallel to the axis of rotation, the pruning tool assembly 1 is arranged to allow safer and more ergonomic operation of the pruning tool assembly 1, wherein the pruning tool 5 is held such that the plane of rotation of the radially outer portion 5' of the pruning tool 5 is substantially vertical, as further explained herein.

[0072] According to the illustrated embodiment, each of the first and second guard portions 11, 12 covers approximately 65% ​​of the area A as seen in the respective first and second directions d1, d2. According to further embodiments, each of the first and second guard portions 11, 12 may cover more than 30% or more than 50% of the area A as seen in the respective first and second directions d1, d2.

[0073] In addition, as in the comparison Figure 3 and Figure 4 As can be seen, according to the illustrated embodiment, each of the first guard portion 11 and the second guard portion 12 overlaps the other of the first guard portion 11 and the second guard portion 12 by approximately 100%, as seen along the respective first and second directions d1 and d2. In other words, according to the illustrated embodiment, the surface area of ​​the first guard portion 11 as seen in the first direction d1 substantially corresponds to the surface area of ​​the second guard portion 12 as seen in the second direction d2. According to further embodiments, each of the first guard portion 11 and the second guard portion 12 may overlap the other of the first guard portion 11 and the second guard portion 12 by at least 70% or at least 85%, as seen along the respective first and second directions d1 and d2.

[0074] Figure 5 Shows Figure 1 The pruning tool assembly 1 is shown held in an intended use position relative to the edge structure 50 .

[0075] like Figure 5 As shown, the guard 7 is attached to the attachment section 23' of the tubular elongated support column 23. The attachment section 23' is also Figure 2 Instructions. Figure 5 In FIG. 5 , the rotation plane rP of the radially outer part of the pruning tool 5 is indicated.

[0076] If available Figure 5 As can be seen in the figure, according to the illustrated embodiment, each of the connecting portion 25 and the first guard portion 11 of the drive shaft 3 is arranged on a first side S1' of the rotation plane rP, and the gear assembly 28 is arranged on a second side S2' of the rotation plane rP, wherein the second side S2' is opposite to the first side S1'.

[0077] According to the embodiment shown, the angle a1 between the rotation plane rP and the vector v pointing from the attachment section 23 'to the connection part 25 is about 69 degrees. According to other embodiments, the angle a1 between the rotation plane rP and the vector v pointing from the attachment section 23 'to the connection part 25 may be in the range of 10 to 85 degrees, or may be in the range of 59 to 79 degrees. According to the embodiment shown, the angle a1 is measured in a plane including the rotation axis, i.e., in a plane perpendicular to the rotation plane rP of the trimming tool 5.

[0078] Below, unless otherwise specified, also refer to Figures 1 to 5 According to the embodiment shown, the drive shaft 3 of the pruning tool assembly 1 is flexible, wherein the tubular elongated support column 23 has a curved portion 26. Furthermore, according to the embodiment shown, the curved portion 26 is arranged between the attachment section 23' and the pruning tool 5. Furthermore, according to the embodiment shown, the portion 24 of the tubular elongated support column 23 between the attachment section 23' and the connecting portion 25 is substantially straight.

[0079] According to further embodiments, the portion 24 of the tubular elongated support column 23 between the attachment portion 23' and the connecting portion 25 may also include one or more curved portions. In addition, according to some embodiments, the drive shaft 3 of the pruning tool assembly 1 may be rigid, wherein all segments of the tubular elongated support column 23 are substantially straight. According to this embodiment and other embodiments described herein, the pruning tool assembly 1 may include one or more curved portions. Figure 2 and Figure 5 More gear assemblies 28 are depicted in FIG.

[0080] like Figures 1 to 5 As shown, according to the embodiment shown, the cutting guard 7 comprises a first edge portion 13 arranged radially outside the trimming tool 5, wherein the first edge portion 13 connects the first guard portion 11 and the second guard portion 12. According to the embodiment shown, the tubular elongated support column 23 is attached to the first edge portion 13 of the guard 7. However, the guard 7 may be attached to the tubular elongated support column 23 in another way.

[0081] like Figure 3As shown, according to the embodiment shown, the first edge portion 13 is arc-shaped, and its radius of curvature r13 is about 100% of the distance D13 between the rotation axis ax and the first edge portion 13. According to other embodiments, the radius of curvature r13 of the first edge portion 13 may be in the range of 80% to 130% of the distance D13 between the rotation axis ax and the first edge portion 13. The distance D13 between the rotation axis ax and the first edge portion 13 may be measured between the rotation axis ax of the trimming tool 5 and a radially outer portion of the first edge portion 13.

[0082] Furthermore, according to the illustrated embodiment, the arc length L13 of the first edge portion 13 is approximately 155% of the distance D13 between the rotation axis ax and the first edge portion 13. According to other embodiments, the arc length L13 of the first edge portion 13 may be in the range of 50% to 500% of the distance D13 between the rotation axis ax and the first edge portion 13, or may be in the range of 100% to 250% of the distance D13 between the rotation axis ax and the first edge portion 13.

[0083] In this way, the first edge portion 13 may prevent cutting residues and other types of objects and particles from flying out of the pruning tool 5 during operation of the pruning tool assembly 1 in an effective manner.

[0084] In addition, if Figures 1 to 5 As shown, according to the embodiment shown, the guard 7 includes a second edge portion 15. According to the embodiment shown, the second edge portion 15 is arranged opposite to the first edge portion 13 and also connects the first guard portion 11 and the second guard portion 12. According to another embodiment, the guard 7 may include an opening section radially outside the trimming tool 5 at a position opposite to the first edge portion 13.

[0085] According to the embodiment shown, the fact that each of the first edge portion 13 and the second edge portion 15 connects the first guard portion 11 and the second guard portion 12 means that the guard 7 surrounds the trimming tool 5 in a plane P2 parallel to the rotation axis ax, as shown in FIG. Figure 4 shown.

[0086] like Figure 3 As shown, according to the illustrated embodiment, the second edge portion 15 is arc-shaped, and its radius of curvature r15 is approximately 100% of the distance D15 between the rotation axis ax and the second edge portion 15. According to other embodiments, the radius of curvature r15 of the second edge portion 15 may be in the range of 80% to 130% of the distance D15 between the rotation axis ax and the second edge portion 15.

[0087] According to the embodiment shown, the arc length L15 of the second edge portion 15 is approximately 57% of the distance D15 between the rotation axis ax and the second edge portion 15, and according to other embodiments, the arc length L15 of the second edge portion 15 may be in the range of 3% to 80% of the distance D15 between the rotation axis ax and the second edge portion 15, or may be in the range of 25% to 90% of the distance D15 between the rotation axis ax and the second edge portion 15. The distance D15 between the rotation axis ax and the second edge portion 15 may be measured between the rotation axis ax of the trimming tool 5 and a radially outer portion of the second edge portion 15.

[0088] exist Figure 4 In FIG. 1 , a plane P1 is indicated that includes the rotation axis ax of the pruning tool 5. Since the plane P1 includes the rotation axis ax, the plane P1 extends through the rotation axis ax and is parallel to the rotation axis ax. In addition, according to the embodiment shown, the plane P1 extends through the tubular elongated support column 23 of the pruning tool assembly 1.

[0089] If available Figures 1 to 5 As can be seen in , according to the embodiment shown, the first and second guard portions 11, 12 and the first and second edge portions 13, 15 together form a disk-shaped object having one cut-out section on either side of a plane P1 including the axis of rotation ax.

[0090] In other words, Figure 4 As shown, according to the embodiment shown, the guard 7 comprises a first orifice 21 at a first side S1 of a plane P1 including the rotation axis ax and a second orifice 22 at a second side S2 of the plane P1 including the rotation axis ax. Figure 4 As can be seen in the figure, the pruning tool 5 has an effective radius r that is greater than the distance D21 from the rotation axis ax to the edge 21' of the first aperture 21, and an effective radius r that is greater than the distance D22 from the rotation axis ax to the edge 22' of the second aperture 22. In this way, the pruning tool assembly 1 can be used to cut vegetation around the edge structure 50 in a convenient, efficient and safe manner, as further explained below.

[0091] According to the embodiment shown, the plane P1 forms a symmetry plane of the guard 7, wherein the design and measurements of the guard 7 at the second side S2 of the plane P1 substantially correspond to the design and measurements of the guard 7 at the first side S1 of the plane P1. In other words, according to the embodiment shown, the design and measurements of the guard 7 at the second side S2 of the plane P1 substantially correspond to the mirror image of the design and measurements of the guard 7 at the first side S1 of the plane P1. Therefore, the plane P1 as mentioned herein may also be referred to as the symmetry plane P1 of the guard 7.

[0092] The edges 21', 22' of the first and second orifices 21, 22 form the delimiting surfaces of the cutout section of the above-mentioned disc-shaped object, i.e. the disc-shaped object formed by the first and second guard portions 11, 12 and the first and second edge portions 13, 15 of the guard 7. Figure 3 and Figure 4 As best seen in the figure, according to the embodiment shown, the edges 21', 22' of the first and second orifices 21, 22 are concave in a plane parallel to the plane of rotation of the pruning tool 5 and each edge has a radius of curvature greater than the effective radius r of the pruning tool 5. However, according to further embodiments, the guard 7 and the first and second orifices 21, 22 may have another design.

[0093] like Figure 5 As shown, according to the illustrated embodiment, the second edge portion 15 forms a ground engaging portion for maintaining a predetermined distance D15 between the rotation axis ax and the ground 52 by abutting contact against the ground 52 .

[0094] In more detail, Figure 5 In the embodiment of the invention, the edge structure 50 includes a vertical section 53 and a ground surface 52, which is positioned adjacent to and below the vertical section 53 as seen relative to the local gravity vector gv. The vertical section 53 of the edge structure 50 is substantially parallel to the local gravity vector. Figure 5 In FIG. 5 , a second ground surface 54 is indicated.

[0095] As mentioned above, in Figure 5 , the pruning tool assembly 1 is shown in an intended use position relative to the edge structure 50. In the intended use position of the pruning tool assembly 1 according to embodiments herein, the rotation plane rP of the pruning tool 5 is substantially parallel to the local gravity vector gv. In other words, when the pruning tool assembly 1 according to embodiments herein is in the intended use position, the rotation axis ax of the pruning tool 5 is substantially perpendicular to the local gravity vector gv. Furthermore, according to the embodiment shown, the pruning tool assembly 1 is configured such that the rotation axis ax of the pruning tool 5 points in a direction towards a user of the pruning tool assembly 1, as further explained herein.

[0096] As mentioned above, and as can be seen in Figure 5 As can be seen in the figure, the second edge portion 15 can be used to maintain a predetermined distance D15 between the rotation axis ax and the ground 52 by abutting contact against the ground 52. In addition, the first guard portion 11 is configured to maintain a predetermined distance D11 between the rotation plane rP of the trimming tool 5 and the substantially vertical section 53 of the edge structure 50 by abutting contact against the substantially vertical section 53 of the edge structure 50.

[0097] Therefore, due to the features of the pruning tool assembly 1, the user can guide the pruning tool assembly 1 so that the guard 7 and the pruning tool 5 move laterally along the edge structure 50 in either direction to cut vegetation at the substantially vertical section 53 of the edge structure in a safer, faster and more convenient manner. Since the first guard portion 11 can be used to maintain a predetermined distance D11 between the rotation plane rP of the pruning tool 5 and the substantially vertical section 53 of the edge structure 50, a predetermined and uniform cutting height can be obtained at the substantially vertical section 53 of the edge structure 50. The second edge portion 15 can be used to maintain a predetermined distance D15 between the rotation axis ax and the ground 52, thereby preventing materials such as sand from being splashed from the ground 52.

[0098] exist Figure 5 In the embodiment shown, the user can stand Figure 5 However, even if it is not optimal, the user can stand on the ground 52 and can use the second guard part 12 to maintain a predetermined distance between the rotation plane rP of the trimming tool 5 and the vertical section 53 of the edge structure 50.

[0099] According to the illustrated embodiment, the predetermined distances D11, D15 are fixed predetermined distances D11, D15. However, according to other embodiments, one or more portions of the guard 7 may be adjustably arranged relative to the trimming tool 5 to allow a user to adjust one or both of the predetermined distances D11, D15.

[0100] Figure 6 Shown is a reference Figures 1 to 5 A second perspective view of the trimming tool assembly 1 is shown. Figure 6 As best seen in FIG. 1 , according to the embodiment shown, the first guard portion 11 of the guard 7 includes a central opening 33. Figure 1 As seen in the first direction shown, the central opening 33 overlaps at least a portion of the pruning tool 5. The rotation axis of the pruning tool 5 extends through the central opening 33.

[0101] Figure 7 Shown according to Figures 1 to 6 The embodiment of the pruning tool assembly 1 of the embodiment shown is a cross-section of the pruning tool 5, the gear assembly 28 and a portion of the tubular elongated support column 23. Figure 7 In FIG. 1 , a portion of the drive shaft 3 can be seen.

[0102] As described above, the drive shaft 3 may be flexible. According to such an embodiment, the drive shaft 3 may include a high-strength wire winding, a coil-like body, etc., which is designed to transmit rotational motion and power through a curved path. According to the illustrated embodiment, the tubular elongated support column 23 includes a bushing 35 serving as a protective shell for the drive shaft 3, so that the drive shaft 3 can also rotate smoothly at the curved section of the tubular elongated support column 23.

[0103] According to the embodiment shown, the gear assembly 28 comprises a first bevel gear 37 connected to the drive shaft 3 and a second bevel gear 38 connected to the trimmer unit shaft 39. The trimming tool shaft 39 comprises an attachment section 41 for attaching the trimming tool 5 to the trimming tool shaft 39. According to the embodiment shown, the trimming tool 5 is attached to the attachment section 41 of the trimming tool shaft 39 by a fastener 43. According to the embodiment shown, the fastener 43 is a nut screwed onto a threaded portion of the trimming tool shaft 39. According to further embodiments, the trimming tool 5 may be attached to the attachment section 41 of the trimming tool shaft 39 in another way, for example by another type of fastener, such as a bolt.

[0104] Figure 6 The central opening 33 shown allows the user to access the fastener 43 in a quick and continuous manner without having to remove the guard 7 of the pruning tool assembly 1. According to the illustrated embodiment, the gear assembly 28 is attached to the second guard portion 12 of the guard 7 at the attachment section 45 of the gear assembly 28. The attachment section 45 of the gear assembly 28 is also Figure 5 The gear assembly 28 may be attached to the second guard portion 12 of the guard 7 by an elongated fastening element extending into the attachment section 45 of the gear assembly 28 .

[0105] According to the embodiment shown, the central opening 33 has a circular shape and, when measured in a direction perpendicular to the rotation axis ax of the pruning tool 5, the diameter of the central opening is smaller than the diameter of the pruning tool 5. A user of the pruning tool assembly 1 according to the embodiment shown can remove the pruning tool 5 from the guard 7 by removing the fastener 43 from the threaded portion of the pruning tool shaft 39 and removing the elongated fastener extending into the attachment section 45 of the gear assembly 28. The user can then remove the pruning tool 5 from the guard 7 via Figure 4 and Figure 5 One of the first and second apertures 21, 22 is shown to remove the pruning tool 5 from the guard 7. In this way, the user can remove the pruning tool 5 from the guard 7 in a quick and continuous manner without having to disassemble the guard 7 of the pruning tool assembly 1.

[0106] For example, when wanting to perform maintenance and care of the pruning tool 5, when wanting to clean the pruning tool 5 and / or the guard 7, and / or when wanting to replace the pruning line 51 of the pruning tool 5, the user may want to remove the pruning tool 5 from the guard 7. However, according to the embodiment shown, the user can also remove the pruning tool 5 by Figure 4 and Figure 5 One or both of the first and second apertures 21 , 22 shown provide access to the pruning tool 5 to change the pruning wire 51 of the pruning tool 5 without having to remove the pruning tool 5 from the guard 7 .

[0107] As understood from the above, the pruning tool shaft 39 is configured to rotate around the rotation axis ax of the pruning tool 5 during operation. The first bevel gear 37 and the second bevel gear 38 form a bevel gear assembly 27, wherein the pruning tool 5 is connected to the drive shaft 3 via the bevel gear assembly 27. The bevel gear assembly 27 allows the rotation axis ax3 of the drive shaft 3 to be angled relative to the rotation axis ax of the pruning tool 5. Therefore, the bevel gear assembly 27 reduces the need for a large curvature of the tubular elongated support column 23. According to further embodiments, the pruning tool assembly 1 may include another type of gear assembly, such as a spur gear assembly, etc.

[0108] Also refer to the following Figures 1 to 7 Provide explanation.

[0109] As used herein, the expression "substantially parallel to" may encompass angles between the referenced objects being less than 10 degrees, or less than 7 degrees.

[0110] As used herein, the expression "substantially perpendicular to" may encompass angles between the referenced objects being in the range of 80 to 100 degrees or in the range of 83 to 97 degrees.

[0111] As used herein, the expression "substantially straight" may encompass a shape in which the referenced object deviates from a straight plane by less than 10%.

[0112] As used herein, the expression “substantially vertical” may encompass that the angle between the referenced object and the local gravity vector gv at the location of the pruning tool assembly 1 is less than 20 degrees, or less than 10 degrees.

[0113] As used herein, the expression "substantially corresponds to" may encompass that the mentioned aspects, objects, distances or measurements deviate from each other by less than 10%.

[0114] It should be understood that the foregoing is an illustration of various exemplary embodiments, and the present invention is limited only by the appended independent claims. Those skilled in the art will recognize that the exemplary embodiments may be modified without departing from the scope of the present invention as defined by the appended independent claims, and that different features of the exemplary embodiments may be combined to create embodiments other than those described herein.

[0115] As used herein, the terms "comprise" or "include" are open ended and include one or more stated features, elements, steps, components or functions, but do not exclude the presence or addition of one or more other features, elements, steps, components, functions or combinations thereof.

Claims

1. An edge trimming tool assembly (1) configured to cut vegetation around an edge structure (50), the assembly (1) comprising a drive shaft (3) and a trimming tool (5) connected to the drive shaft (3), in, The pruning tool (5) is configured to be rotated about a rotation axis (ax) by means of the drive shaft (3) so that a radially outer portion (5') of the pruning tool (5) performs an orbital motion along a circular path (c) in a rotation plane (rP), The component (1) comprises a protective member (7), the protective member comprising a first protective portion (11) and a second protective portion (12), the first protective portion covering a portion of an area (A) formed inside the circular path (c) when viewed in a first direction (d1) parallel to the rotation axis (ax), and the second protective portion covering a portion of the area (A) when viewed in a second direction (d2) parallel to the rotation axis (ax), wherein the second direction (d2) is opposite to the first direction (d1), The protective member (7) comprises a first edge portion (13) and a second edge portion (15) which are arranged opposite to each other. Wherein, the second guard portion (35) forms a ground engaging portion for maintaining a predetermined distance (D15) between the rotation axis (ax) and the ground (52) by abutting contact against the ground (52).

2. The assembly (1) according to claim 1, wherein Each of the first and second guard portions (11, 12) covers more than 30% or more than 50% of the area (A) when viewed in the respective first (d1) and second (d2) directions.

3. Assembly (1) according to claim 1 or 2, wherein: Each of the first and second guard portions (11, 12) overlaps at least 70% of the other of the first and second guard portions (11, 12) when viewed along the respective first and second directions (d1, d2).

4. Assembly (1) according to any one of the preceding claims, wherein: The trimming tool (5) comprises a tubular elongated support column (23), wherein the drive shaft (3) is arranged inside the tubular elongated support column (23) and comprises a connecting portion (25) for connecting the output shaft (4) of the power unit (6) to the drive shaft (3).

5. Assembly (1) according to claim 4, wherein The guard (7) is attached to the attachment section (23') of the tubular slender support column (23), and wherein the angle (a1) between the rotation plane (rP) and the vector (v) pointing from the attachment section (23') to the connecting part (25) is in the range of 10 degrees to 85 degrees, or in the range of 59 degrees to 79 degrees.

6. Assembly (1) according to claim 4 or 5, wherein: The drive shaft (3) is flexible, and wherein the tubular elongated support column (23) has a curved portion (26).

7. Assembly (1) according to any one of claims 4 to 6, wherein: Each of the connecting portion (25) and the first guard portion (11) is arranged on a first side (S1') of the rotation plane (rP).

8. Assembly (1) according to any one of the preceding claims, wherein The cutting guard (7) comprises a first edge portion (13) which is arranged radially outside the trimming tool (5), and wherein the first edge portion (13) connects the first guard portion and the second guard portion (11, 12).

9. Assembly (1) according to any one of the preceding claims, wherein: The second edge portion (15) connects the first guard portion and the second guard portion (11, 12).

10. Assembly (1) according to any one of the preceding claims, wherein The second edge portion (15) is arc-shaped, and a radius of curvature (r15) of the arc is within a range of 80% to 130% of a distance (D15) between the rotation axis (ax) and the second edge portion (15).

11. Assembly (1) according to any one of the preceding claims, wherein The guard (7) surrounds the trimming tool (5) in a plane (P2) parallel to the axis of rotation (ax).

12. Assembly (1) according to any one of the preceding claims, wherein The guard (7) comprises a first aperture (21) at a first side (S1) of a plane (P1) comprising the rotation axis (ax), and wherein an effective radius (r) of the trimming tool (5) is greater than a distance (D21) from the rotation axis (ax) to an edge (21') of the first aperture (21).

13. Assembly (1) according to claim 12, wherein The guard (7) comprises a second aperture (22) at a second side (S2) of the plane (P1), and wherein the effective radius (r) of the trimming tool (5) is greater than the distance (D22) from the rotation axis (ax) to an edge (22') of the second aperture (22).

14. Assembly (1) according to any one of the preceding claims, wherein The pruning tool (5) comprises a bevel gear assembly (27), and wherein the pruning tool (5) is connected to the drive shaft (3) via the bevel gear assembly (27).

15. A power tool (2), comprising: A power unit (6) comprising an output shaft (4) and a motor (8) configured to rotate the output shaft (4), and An edge trimming tool assembly (1) according to any one of the preceding claims, Wherein, the drive shaft (3) of the edge trimming tool assembly (1) is connected or connectable to the output shaft (4) of the power unit (6).

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