trimmer

Abstract

The present disclosure relates to a trimmer (2) for cutting branches, comprising a handle portion (4), a cutting portion (6) comprising a pair of shears, a tube portion (8) interconnecting the handle portion (4) and the cutting portion (6), and an electric drive (12) for actuating at least one of the pair of shears. The drive (12) comprises an electric motor (14), a gear box (16) and a mechanism (18) for converting rotational motion into linear motion, the electric motor (14) and the gear box (16) being arranged within or at the handle portion (4), the mechanism (18) for converting rotational motion into linear motion being provided within or at the cutting portion (6). The drive (12) further comprises a rotatable drive shaft (20) extending through the tube portion (8) and being connected to the gear box (16) and to the mechanism (18) for converting rotational motion into linear motion.

Description

Technical Field

[0001] This invention relates to a pruning tool for cutting tree branches. Background Technology

[0002] A pruning shear is a gardening tool consisting of a pair of shear blades configured to cut twigs and / or branches of trees and / or shrubs. Compared to pruning shears and trimming shears, hand pruning shears have one or more long handles. Therefore, compared to a pair of pruning or trimming shear blades, a pruning shear has a longer reach and can provide greater cutting force.

[0003] Electric trimmers are known in the art. In such trimmers, an electric motor drives a pair of shear blades. For example, a lead screw can be used to move one of the shear blades relative to the other. The lead screw converts the rotation of the electric motor into linear motion. A gearbox can reduce the speed of the electric motor and increase the torque applied to the lead screw.

[0004] A trimmer known from KR 101306959 B1 discloses a pivotable joint at its cutting head, allowing the cutting portion to be arranged at different angles relative to its shank. For example, JP 2001-340023, WO 2018 / 205126, DE9401672 U1, CN 111 567 251A, and CN 108 184 470A disclose trimmers with a motor and a lead screw arranged in or at the handle of the respective trimmer. Linear motion is transmitted through a tube from the handle end to a pair of blades at the opposite end of the trimmer. Some of these trimmers even have a removable shaft segment that can be inserted into the trimmer shaft to extend the shaft.

[0005] EP 3000313 and US 5826341 disclose trimmers having an electric motor and a mechanism for actuating the shear blades, the mechanism being arranged at the shearing end of the tube opposite the handle end. Summary of the Invention

[0006] In trimmers with an electric motor and a lead screw arranged in the handle portion, the tube extending to the blades must be able to withstand high linear forces transmitted through the tube to prevent, for example, bending. Furthermore, if the tube is telescopic, special measures are required to withstand the high linear forces when fixing the telescopic components relative to each other in the extended position. Such trimmers require robust and correspondingly heavy tubes, making operation cumbersome, especially if the tube is long.

[0007] Pruners with a complete shear blade drive mechanism (including a motor located at the shear blade in the cutting section of the pruner) are heavy at the shear blade, making it difficult to control the pruner precisely. Furthermore, the pruner will have a large cutting section, making it difficult to reach, for example, certain small branches or twigs located in dense foliage.

[0008] It would be advantageous to implement an electric pruner that overcomes or at least mitigates some of the aforementioned disadvantages. In particular, it is desirable to provide an electric pruner that is easy to operate and can be precisely moved relative to the twigs and / or branches to be cut. To better address one or more of these problems, a pruner having the features defined in the independent claims is provided.

[0009] According to an aspect of the invention, a pruning tool for cutting tree branches is provided, the pruning tool comprising: a handle portion; a cutting portion including a pair of shear blades; a tube portion interconnecting the handle portion and the cutting portion; and an electric drive device for actuating at least one of the pair of shear blades. The drive device includes an electric motor, a gearbox, and a mechanism for converting rotational motion into linear motion, the electric motor and gearbox being disposed in or at the handle portion, and the mechanism for converting rotational motion into linear motion being disposed in or at the cutting portion. The drive device further includes a rotatable drive shaft extending through the tube portion and connected to the gearbox and the mechanism for converting rotational motion into linear motion.

[0010] Because the motor and gearbox are arranged in or at the handle section, and the mechanism for converting rotary motion into linear motion is arranged in or at the cutting section, the weight of the drive unit is distributed between the handle section and the cutting section of the trimmer. Two of these components of the drive unit are located in or at the handle section, and only one component is located in or at the cutting section. Therefore, the weight of the drive unit is distributed towards the handle section. Furthermore, because the drive unit includes a rotatable drive shaft extending through the tube section, the tube section primarily bears torsional loads, which can be supported by a tube section that is longer and lighter than the tube section that must support compressive and buckling loads. Therefore, the cutting section is light and slender, and the tube section is light, which facilitates easy operation and precise control of the trimmer and its cutting section.

[0011] Pruners can be household or commercial gardening tools. Pruners can be constructed for cutting twigs and / or branches of trees and / or shrubs.

[0012] The electric drive unit can be powered by a battery located within the trimmer or by the user of the trimmer, for example, carried in the user's backpack or in a belt around the waist. Alternatively, the electric drive unit can be powered by a mains power source via a power cord.

[0013] The handle portion is configured for the user to grip and operate the trimmer. The tube portion is designed to extend the user's reach of the trimmer so that it can be used to cut twigs and / or branches at a distance from the user, such as in the foliage of a tree or in dense shrubs.

[0014] The drive shaft can be journal-connected to the tube section.

[0015] In this document, the mechanism for converting rotary motion into linear motion may also be referred to as such a mechanism. This mechanism may be directly or indirectly connected to at least one of the blades. The mechanism for converting rotary motion into linear motion may, for example, include a lead screw or ball screw connected to at least one of the blades. Thus, one blade can move relative to the other blade to generate a cutting relative motion between the blades.

[0016] A gearbox can reduce the speed of an electric motor and increase the torque applied to the mechanism that converts rotary motion into linear motion.

[0017] According to some implementations, the tube portion can have a length of ≥1m, such as a length in the range of 1m to 5m or 1m to 6m. In this way, the trimmer can be configured to extend the user's reach to cut twigs and / or branches at a distance from the user, for example, in the foliage of a tree or in a shrub.

[0018] Furthermore, since the aforementioned buckling problem in existing trimmers where the motor and lead screw are arranged at the handle portion of the trimmer increases with the length of the trimmer, existing trimmers with a rotatable drive shaft extending through the tube portion and connected to the gearbox at the handle portion and to the aforementioned mechanism at the cutting portion are particularly advantageous for manufacturing long trimmers. That is, this trimmer may be particularly advantageous where the tube portion is in the upper part of the aforementioned range, such as 2.5m to 5m or 2.5m to 6m.

[0019] According to some embodiments, the tube portion may include extendable tube segments, and the rotatable drive shaft may include extendable shaft segments arranged within the extendable tube segments. In this way, the pruner can be configured to extend its reach. Therefore, the versatility of the pruner can be increased when the user can access twigs and / or branches from a greater distance.

[0020] Furthermore, as described above, since the motor and gearbox are arranged in or at the handle section, and the mechanism is arranged in or at the cutting section, and since the drive unit includes a rotatable drive shaft extending through the tube section, the tube section primarily bears torsional loads. In extendable tube sections, this torsional load can be easily supported compared to prior art trimmers configured to transmit compressive loads via the tube section. Therefore, lightweight extendable tube sections can be provided.

[0021] According to one embodiment, the tube portion may include separate insertable and removable tube segments. The drive shaft may include insertable and removable shaft segments arranged within the insertable and removable tube segments. In this way, the tube portion can be disassembled, or disassembled from one or more of the cutting portion and the handle portion.

[0022] Furthermore, as described above, since the motor and gearbox are arranged in or at the handle section, and the mechanism is arranged in or at the cutting section, and since the drive unit includes a rotatable drive shaft extending through the tube section, the tube section primarily bears torsional loads. In a separate insertable and removable tube segment, this torsional load can be easily supported compared to prior art trimmers configured to transmit compressive loads via the tube section. Therefore, lightweight separate insertable and removable tube segments can be provided.

[0023] Insertable and removable shaft segments can be inserted and removed as a unit within insertable and removable tube segments. Therefore, the insertable and removable shaft segments themselves do not need to be removed from the insertable and removable tube segments.

[0024] According to the embodiments, the rotatable drive shaft may have a non-circular cross-section, such as a square, hexagonal, or elliptical cross-section. In this way, engagement between the drive shaft and the gearbox, between the drive shaft and the mechanism for converting rotary motion into linear motion, and / or between segments of the drive shaft can be facilitated. That is, compared to a drive shaft with a circular cross-section, the risk of free rotation of the drive shaft is reduced when it is engaged with the gearbox and / or with the mechanism for converting rotary motion into linear motion, or when the segments of the drive shaft are engaged with each other.

[0025] According to one embodiment, the pruner may include a pivotable joint for positioning the cutting portion relative to the tube portion at at least two different angles. In this way, access to twigs and / or branches in the foliage of a tree or in dense shrubs can be improved through the cutting portion.

[0026] Further features and advantages of the invention will become apparent when examined in light of the appended claims and the following detailed description. Attached Figure Description

[0027] Various aspects and / or embodiments of the present invention, including their particular features and advantages, will be readily understood from the exemplary embodiments discussed in the following detailed description and accompanying drawings, in which:

[0028] Figures 1a to 1g A trimmer according to some implementations is shown.

[0029] Figure 2 The drive mechanism of the trimmer is shown schematically.

[0030] Figure 3a and Figure 3b The cross-section of the section passing through the extendable tube segment is shown.

[0031] Figure 4 Cross-sections are shown through multiple sections of a single, insertable, and removable tube segment, as well as

[0032] Figure 5 This shows a cross-section of a portion of the cut section that passes through the trimmer. Detailed Implementation

[0033] The aspects and / or embodiments of the invention will now be described more fully. Similar reference numerals refer to similar elements throughout. For the sake of brevity and / or clarity, well-known functions or structures need not be described in detail.

[0034] Figures 1a to 1g A pruner 2 according to an embodiment is shown. Pruner 2 is configured for cutting twigs and / or branches.

[0035] exist Figure 1a The image shows trimmer 2 in its fully extended state. Figure 1b The image shows the trimmer 2 in a compact, shortened state, and... Figures 1c to 1g The different parts of trimmer 2 are shown in the figure. As will be discussed below, trimmer 2 can have one or more extended states between a fully extended state and a shortened state.

[0036] The trimmer 2 includes a handle portion 4, a cutting portion 6, and a tube portion 8. The tube portion 8 connects the handle portion 4 and the cutting portion 6. The cutting portion 6 includes a pair of shear blades 10. The trimmer 2 further includes a drive mechanism, see below. Figure 2 The drive unit is configured to actuate one or both of the pair of scissor blades 10. The drive unit is powered, for example, by a battery or mains power.

[0037] The handle portion 4, and optionally the tube portion 8, can be gripped by a user for manipulating the trimmer 2. The tube portion 8 allows the user of the trimmer 2 to trim with a pair of scissor blades 10 from a position out of reach of the user's arm. The handle portion 4 includes a control device for operation by the user of the trimmer 2. This control device is configured at least to initiate cutting using the pair of scissor blades 10.

[0038] For this purpose, the length of the tube portion 8 may be ≥1m, such as being in the range of 1m to 4m, or in the range of 1m to 5m, or in the range of 1m to 6m. This length is the length when the tube portion 8 is fully extended, telescoping, and / or has one or more individual tube portions, as described below.

[0039] According to some embodiments, the tube portion 8 may form at least 50% of the total length of the trimmer 2. In this way, the tube portion 8 can substantially extend the length of the trimmer 2 and thus also extend the reach of the user of the trimmer 2. This length is the length when the tube portion 8 is fully extended, telescoping, and / or has one or more individual tube segments, as described below.

[0040] The tube section 8 includes one or more tube segments 81, 82, 83, such as an extendable tube segment 81, a separate insertable and removable tube segment 82, and a tube segment 83 that carries the cut section 6. Figure 1a In the diagram, the trimmer 2 is shown as having three tube segments: an extendable tube segment 81 connected to the handle portion 4, a separate insertable and removable tube segment 82, and a tube segment 83 carrying the cutting portion 6. Figure 1a and Figure 1d The image shows the extendable tube segment 81 in its extended state. Figure 1b In the diagram, the trimmer 2 is shown as having two pipe sections: an extendable pipe section 81 and a pipe section 83 that carries the cutting portion 6. Figure 1b and Figure 1c The image shows the extendable tube segment 81 in its shortened state.

[0041] Therefore, trimmer 2 can be divided into three separate parts, each including one of the tube segments 81, 82, and 83. (As from...) Figure 1a and Figure 1b It is understood that the trimmer 2 may or may not be fitted with an insertable and removable tube segment 82.

[0042] Different pipe sections 81, 82, and 83 are interconnected by internal threads 22 and external threads 24 located at the ends of the pipe sections 81, 82, and 83. The internal thread 22 may be located in a slot 26. Alternative components, such as bayonet couplings and spline couplings, may be provided for connecting the different pipe sections 81, 82, and 83.

[0043] According to some embodiments (such as the one shown), the pruner 2 may include a pivotable joint 28 for positioning the cutting portion 6 relative to the tube portion 8 at at least two different angles. Therefore, the versatility of the pruner 2 is increased because the cutting portion 6 can be used more effectively to reach twigs and / or branches. Specifically, in Figure 1f and Figure 1g The image clearly shows two different angles of the cutting portion 6 relative to the tube portion 8. The cutting portion 6 can be further positioned at an intermediate angle between the two shown angular positions.

[0044] Figure 2 The drive mechanism 12 of the trimmer is shown schematically. The trimmer can be the one shown in the above reference. Figures 1a to 1g The pruner 2 is discussed.

[0045] The drive unit 12 includes an electric motor 14, a gearbox 16, and a mechanism 18 for converting rotary motion into linear motion. The gearbox 16 may include, for example, planetary gears. The mechanism 18 for converting rotary motion into linear motion may include, for example, a lead screw or a ball screw.

[0046] The electric motor 14 and gearbox 16 are arranged in or at the handle portion 4 of the trimmer, and the mechanism 18 for converting rotary motion into linear motion is arranged in or at the cutting portion 6. Figure 2 In the diagram, exemplary positions of the handle portion 4 and the cutting portion 6 are schematically indicated by corresponding curly braces.

[0047] The drive unit 12 includes a rotatable drive shaft 20 extending through the tube portion 8. The drive shaft 20 is connected at one end to a gearbox 16 and at the opposite end to a mechanism 18. (As...) Figure 2 As indicated by the intermittent drive shaft 20, the tube portion 8 and the drive shaft 20 can be set and / or assembled into different lengths, which is also in conjunction with the above. Figures 1a to 1g And below Figure 3a and Figure 3b The subject of discussion.

[0048] As described above, the tube portion 8 may include one or more tube segments. Therefore, the rotatable drive shaft 20 may include one or more shaft segments arranged in one or more tube segments.

[0049] The rotatable drive shaft 20 can have a non-circular cross-section, such as a square, hexagonal, or elliptical shape. Therefore, torque transmission between the two shaft segments can be ensured. Furthermore, torque transmission between the drive shaft 20 and the gearbox 16, and between the drive shaft 20 and the mechanism 18, can be ensured.

[0050] The rotatable drive shaft 20 can be journal-connected to the tube portion 8. In this way, the drive shaft 20 can be slender and therefore lightweight. Supporting the drive shaft 20 in this way can reduce the negative effects of imbalance in the drive shaft 20. Also, in this way, the dimensions of the drive shaft 20 can be determined to transmit a specific maximum torque. It is not necessary to determine the dimensions to provide stiffness to withstand imbalance of the drive shaft 20 during nominal speeds.

[0051] This journal connection can be provided by one or more ball bearings, roller bearings, or thrust bearings. See below for further details. Figures 3a to 4 .

[0052] Since the rotatable drive shaft 20 can have a non-circular cross-section, bushings can be arranged around the drive shaft 20 for journal connection of the drive shaft.

[0053] As an example only, a pair of shear blades 10 and a drive unit 12 can be configured to cut branches up to 32 mm in diameter. For this purpose, the electric motor can have a rated power of 300 W at 18,000 rpm, the gearbox 16 can have a reduction ratio in the range of 10:1 to 80:1 (such as 40:1), and the lead screw of the mechanism 18 can have a diameter in the range of 8 mm to 12 mm, a pitch in the range of 4 mm to 8 mm, and 4 inlets. The torque transmitted via the drive shaft can be in the range of 5 Nm to 15 Nm.

[0054] According to some embodiments, during use of the trimmer 2, the rotatable drive shaft 20 can rotate at a speed ranging from 200 rpm to 800 rpm while transmitting torque from the gearbox 16 to the mechanism 18 for converting rotary motion into linear motion. In this way, the drive shaft 20 can rotate at a moderate speed, which helps to counteract any imbalance of the drive shaft 20 in the tube section 8. For example, it may be sufficient to connect the drive shaft 20 to journals along its length at fewer locations compared to when the drive shaft rotates at a higher speed. Furthermore, the bearings used for journal connections of the drive shaft 20 can be of a simple type, such as sliding bearings made of plastic material.

[0055] Figure 3a and Figure 3b Showed through Figures 1a to 1g The cross-section of a portion of the extendable tube segment 81 of the trimmer shown. Figure 3a and Figure 3b It shows Figure 1a The cross-section of the portion indicated by III. Therefore, also refer to... Figure 1a .

[0056] As described above, the tube portion 8 includes an extendable tube segment 81. Furthermore, the rotatable drive shaft 20 includes an extendable shaft segment 21 disposed within the extendable tube segment 81.

[0057] According to the illustrated embodiment, the extendable tube segment 81 may include a telescopic tube segment 811, and the extendable shaft segment 21 may include a telescopic shaft segment 211. In this way, the extendable tube segment 81 and the extendable shaft segment 21 can be designed in a compact and user-friendly manner to extend the reach of the trimmer.

[0058] Figure 3a A portion of the telescopic tube segment 811 in its extended state is shown. The inner first tube member 30 has been pulled outward from the outer second tube member 32 to the fully extended position of the first tube member 32. Consequently, the inner first shaft member 34 is also pulled outward from the outer second shaft member 36. Figure 3b The telescopic tube segment 811 in its shortened state is shown. The first tube member 30 has been fully inserted into the second tube member 32. In addition, the first shaft member 34 has been inserted into the second shaft member 36.

[0059] According to an alternative embodiment, the first tube member can form an outer tube member, and the second tube member can form an inner tube member. Similarly, the first shaft member can form an outer shaft member, and the second shaft member can form an inner shaft member.

[0060] For example, a clamping member 38 can be provided to secure the first tube member 30 and the second tube member 32 to each other. The clamping member 34 can be released to reposition the first tube member 30 and the second tube member 32 relative to each other. The first tube member 30 and the second tube member 32 can be positioned relative to each other and clamped together in an intermediate position between an extended state and a shortened state. Therefore, the telescopic tube segment 811 can be adjusted to different lengths.

[0061] The rotatable drive shaft 20 can be journal-connected to the telescopic tube segment 811. In this way, the drive shaft 20 can be rotatably supported in the telescopic tube segment 811. Therefore, safe rotation of the drive shaft 20 in the tube segment 8 can be provided.

[0062] In the illustrated embodiment, the drive shaft 20 is journal-connected to both ends of the first tube member 30.

[0063] The first journal of the drive shaft 20 is provided by a first bearing 39. The first bearing 39 includes: an outer bushing 40 disposed in and fixed to the first tube member 30; and an inner bushing 42 rotatably supported in the first bushing 40 and slidably disposed about the drive shaft 20. Thus, when the first bearing 39 is positioned within the second tube member 32, i.e., within the telescopic tube segment 811, the first bearing 39 follows the relevant end of the first tube member 30.

[0064] Another journal of the drive shaft 20 is provided by a second bearing 44 located at the opposite end of the first tube member 30. The outer bushing of the second bearing 44 is formed by the inner first tube member 30. The inner bushing 46 of the second bearing 44 is fixed to the drive shaft 20. The inner bushing 46 is rotatably supported by the inner tube member 30.

[0065] Figure 4 Showed through Figures 1a to 1g The diagram shows and includes combinations Figure 2 The trimmer of drive unit 12 discussed Figure 1e The cross-section of the separated insertable and removable tube segment 82 is shown. Therefore, please also refer to... Figures 1a to 2 .

[0066] As described above, the tube portion 8 includes a separate insertable and removable tube segment 82. Furthermore, the drive shaft 20 may include an insertable and removable shaft segment 48 disposed within the insertable and removable tube segment 82.

[0067] To enable the drive shaft 20 to transmit torque via insertable and removable shaft segments 48, spline connections can be provided between the segments of the drive shaft. Therefore, the insertable and removable shaft segments 48 may include: a first end 50 having a spline 52 configured to engage with a spline end of the drive shaft portion connected to the gearbox 16; and a second end 54 having a spline 56 configured to engage with a spline end of the drive shaft portion connected to the mechanism 18 to convert rotational motion into linear motion.

[0068] In the illustrated embodiment, the first end 50 is provided with an external spline 52, and the second end 54 is provided with an internal spline 56 arranged in a slot.

[0069] An insertable and removable shaft segment 48 is journal-connected at a first end 50 provided with spline 52 and a second end 54 provided with spline 56. In this way, the insertable and removable shaft segment 48 is rotatably supported in the insertable and removable tube segment 82.

[0070] In the illustrated embodiment, the insertable and removable shaft segment 48 is journal-connected by bearings 58 and 60, wherein the outer bushing is formed by a tube member 62 of the insertable and removable tube segment 82 and inner bushings 64 and 66 fixed to the insertable and removable shaft segment 48. The inner bushings 64 and 66 may be formed by corresponding first end 50 and second end 54 provided with splines 52 and 56.

[0071] Each of the first end 50 with spline 52 and the second end 54 with spline 56 can be made of a plastic material (such as polyamide). In this way, the ends 50 and 54 with splines 52 and 56 can be efficiently produced, for example, by injection molding. If the ends 50 and 54 with splines 52 and 56 form the bushings of bearings 58 and 60, the plastic material, such as polyamide, forms a durable material that withstands wear caused by rotation in the tube member 62.

[0072] The connection between the drive shaft segment of the cutting section 6 and the extendable shaft segment of the insertable and removable shaft segment 48 or the extendable tube segment 81 can be referenced above. Figure 4 The spline connection is set up in the same way as discussed.

[0073] Figure 5 A cross-section of a portion of the cutting section 6 through the trimmer is shown, as in the reference above. Figures 1a to 4 The pruner 2 is discussed.

[0074] The mechanism 18 for converting rotary motion into linear motion includes a threaded shaft 70 connected to a rotatable drive shaft 20 and a threaded engagement portion 72 engaging with the threaded shaft 70. The threaded engagement portion 72 is connected to at least one of the shear blades 10 to actuate the shear blades. In this way, a lead screw or ball screw can be provided to perform the cutting motion with the shear blades 10.

[0075] exist Figure 5 In the image, for clarity, the movable scissor blade connected to the threaded engagement portion 72 is indicated by a dashed line.

[0076] According to an alternative embodiment, the threaded engagement portion 72 may be connected to the drive shaft 20, and the threaded shaft 70 may be connected to at least one of the scissor blades 10 to actuate the scissor blades.

[0077] It should be understood that the foregoing is a description of various exemplary embodiments, and the invention is defined only by the appended claims. Those skilled in the art will recognize that exemplary embodiments can be modified, and different features of exemplary embodiments can be combined to create embodiments other than those described herein, without departing from the scope of the invention as defined by the appended claims.

Claims

1. A pruning tool (2) for cutting tree branches, comprising: A handle portion (4); a cutting portion (6) including a pair of scissor blades (10); a tube portion (8) interconnecting the handle portion (4) and the cutting portion (6); and an electric drive device (12) for actuating at least one of the scissor blades (10), wherein, The drive unit (12) includes a motor (14), a gearbox (16), and a mechanism (18) for converting rotational motion into linear motion. The motor (14) and gearbox (16) are arranged in or at the handle portion (4), and the mechanism (18) for converting rotational motion into linear motion is arranged in or at the cutting portion (6). The drive unit (12) further includes a rotatable drive shaft (20) that extends through the tube portion (8) and is connected to the gearbox (16) and the mechanism (18) for converting rotational motion into linear motion. The tube portion (8) includes a separate insertable and removable tube segment (82), and the drive shaft (20) includes an insertable and removable shaft segment (48) arranged in the insertable and removable tube segment (82). The insertable and removable shaft segment (48) is characterized in that it comprises: a first end (50) provided with a spline (52) configured to mate with a spline end of a portion of the drive shaft (20) connected to the gearbox (16); and a second end (54) provided with a spline (56) configured to engage with a spline end of a portion of the drive shaft (20) connected to the mechanism (18) for converting rotational motion into linear motion. The insertable and removable shaft segment (48) is inserted and removed as a unit by being arranged in the insertable and removable tube segment (82), such that the insertable and removable shaft segment (48) itself does not need to be removed from the insertable and removable tube segment (82).

2. The trimmer (2) according to claim 1, wherein, The tube section (8) has a length of ≥ 1 m.

3. The trimmer (2) according to claim 1, wherein, The length of the tube section (8) is in the range of 1 m to 5 m.

4. The trimmer (2) according to claim 1, wherein, The length of the tube section (8) is in the range of 1 m to 6 m.

5. The trimmer (2) according to claim 1 or 2, wherein, The tube portion (8) forms at least 50% of the total length of the trimmer (2).

6. The trimmer (2) according to claim 1 or 2, wherein, The rotatable drive shaft (20) is journal-connected in the tube section (8).

7. The trimmer (2) according to claim 1, wherein, The tube portion (8) includes an extendable tube segment (81), and wherein the rotatable drive shaft (20) includes an extendable shaft segment (21) arranged in the extendable tube segment (81).

8. The trimmer (2) according to claim 7, wherein, The extendable tube segment (81) includes a telescopic tube segment (811), and wherein the extendable shaft segment (21) includes a telescopic shaft segment (211).

9. The trimmer (2) according to claim 8, wherein, The rotatable drive shaft (20) is journal-connected in the telescopic tube segment (811).

10. The trimmer (2) according to claim 1, wherein, The rotatable drive shaft (20) is journal-connected to the first end (50) provided with spline (52) and the second end (54) provided with spline (56).

11. The trimmer (2) according to claim 1 or 10, wherein, Each of the first end (50) with spline (52) and the second end (54) with spline (56) is made of plastic material.

12. The trimmer (2) according to claim 11, wherein, The plastic material is polyamide.

13. The trimmer (2) according to claim 1 or 2, wherein, The rotatable drive shaft (20) has a non-circular cross-section.

14. The trimmer (2) according to claim 13, wherein, The non-circular cross-section is a square, hexagonal, or elliptical cross-section.

15. The trimmer (2) according to claim 1 or 2, wherein, The rotatable drive shaft (20) rotates at a speed in the range of 200 rpm to 800 rpm during the transmission of torque from the gearbox (16) to the mechanism (18) for converting rotational motion into linear motion.

16. The trimmer (2) according to claim 1 or 2, wherein, The mechanism (18) for converting rotational motion into linear motion includes a threaded shaft (70) connected to the rotatable drive shaft (20) and a threaded engagement portion (72) engaging with the threaded shaft (70), wherein the threaded engagement portion (72) is connected to at least one of the scissor blades (10) to actuate the at least one scissor blade.

17. The trimmer (2) according to claim 1 or 2, the trimmer comprising a pivotable joint (28) for positioning the cut portion (6) relative to the tube portion (8) at at least two different angles.

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