Brush cutter

Abstract

The invention relates to a brush cutter (1), which has a guide tube (2). A tool unit (3) is arranged at the end (42) of the guide tube (2). A handle crossbar (43) is fixed to the guide tube (2), which carries a handle (6, 7) at each end. Each handle (6, 7) has a rod (8) with a fixed end (9) and a free end (10), at which the handle (6, 7) is fixed to the handle crossbar (43). Each handle (6, 7) has a front side (27) facing the tool unit (3) and a rear side (30) opposite to it. The handles (6, 7) have inner sides (29) facing each other and outer sides (28) facing away from each other. At least one of the handles (6, 7) has a theropod support (33), which is configured as a bulge extending on the inner side (29) and the rear side (30) of the rod (8).

Description

Technical Field

[0001] The invention relates to a brush cutter. Background Art

[0002] From EP 2 845 460 A1 a brush cutter is known, on the guide tube of which a handle with two grips is arranged. Summary of the invention

[0003] The object of the invention is to provide a brush cutter of the generic type with which ergonomic and non-tiring work can be achieved.

[0004] This object is achieved by a brush cutter with a guide tube, wherein a tool unit is arranged at the end of the guide tube, wherein a handle crossbeam is fixed to the guide tube, the handle crossbeam carrying a handle at each end, wherein each handle has a rod with a fixed end and a free end, the handle being fixed to the handle crossbeam at the fixed end, wherein each handle has a front side facing the tool unit and an opposite rear side, wherein the handles have inner sides facing each other and outer sides facing away from each other, wherein at least one of the handles has a ball bearing portion, which is configured as a protuberance extending at the inner side and the rear side of the rod.

[0005] During operation of a brush cutter, forces must be applied by the user via the handles in different directions. In this case, it may be necessary to push or press the tool unit during operation. This is particularly advantageous when the tool unit includes a cutter. In order to be able to introduce forces forwards toward the tool unit via the handles, it is provided that at least one of the handles has an eminence support, which is configured as a bulge extending at the inner side and the rear side of the rod. The eminence of the operator can be supported via this eminence support. As a result, the hand can perform a rotational, pushing movement during operation and thus introduce forces forwards toward the tool unit in a very good and ergonomic manner.

[0006] In a particularly preferred design, the two handles have a paracromial support. As a result, the two paracromial supports can carry out a pushing movement forward and are in this case very well supported at the paracromial supports of the handles. The lateral force introduction is strengthened by the paracromial supports. The brush cutter is advantageously suspended on the harness in such a way that the brush cutter is freely suspended on the harness in the operating position. The center of gravity of the brush cutter is advantageously moved toward the tool unit relative to the suspension point. The brush cutter is thus suspended on the harness in such a way that the tool unit is arranged lower than the housing of the brush cutter.

[0007] The at least one apical support makes it possible to introduce forces particularly well for mowing with a brush cutter. During mowing, the brush cutter moves in a reciprocating motion. The brush cutter is pressed and pushed by the operator in order to carry out a feed motion. In this case, the introduction of forces in the lateral direction is intensified by the apical support.

[0008] Via at least one apical support, forces can be introduced particularly well for shredding with a brush cutter. During shredding, the brush cutter moves up and down. The forces for this movement are introduced by the operator by pulling the handle upwards and pressing the handle downwards. The forces for moving the tool unit downwards are applied at least partially, in particular to a large extent, by the weight of the brush cutter.

[0009] The at least one supramaxillary support enables an improved introduction of these forces, thereby achieving ergonomic working.

[0010] The thenar support part advantageously has a thenar support surface between two planes, the distance between these planes advantageously being less than 3 mm. The thenar support surface is thus a nearly planar surface. The thenar support surface is defined by these two planes. Sections of the rod that are not between the two planes are not considered part of the thenar support surface, even if the thenar rests on these sections.

[0011] The length of the thenar support surface measured in the longitudinal direction of the handle is advantageously at least 2.5 cm, in particular at least 3.5 cm. As a result, forces can be introduced via the thenar of the user in the circumferential direction over a sufficiently large length of the rod. The width of the thenar support surface is advantageously at least 8 mm, in particular at least 1 cm.

[0012] The maximum longitudinal spacing of the thenar support portion is advantageously at least 0.7 times, in particular at least 0.8 times, the diameter of the rod measured perpendicular to the maximum spacing and perpendicular to the longitudinal direction. The rear side surface has a radius of at least 10 mm, in particular at least 15 mm, at any position in the section plane perpendicular to the longitudinal direction at the thenar support surface. But in particular for the second handle, a smaller radius can also be provided in the edge region of the thenar support portion. Preferably, the rear side surface is constructed roughly planarly at the thenar support surface. The thenar support surface can be convexly and / or concavely arched in a section plane perpendicular to the longitudinal axis of the handle. Advantageously, the section of the thenar support surface located outside in the circumferential direction is convexly arched. The planar or concavely arched sections can extend in the circumferential direction between the convexly arched sections.

[0013] Advantageously, the thenar support is arranged in the half of the handle adjacent to the fixed end.

[0014] Preferably, the two handles have different shapes. Preferably, an operating element for operating a drive motor of the brush cutter is arranged at one of the handles. Preferably, the handle having at least one operating element is larger than the other handle. Preferably, the right handle is larger than the left handle.

[0015] In order to simplify the gripping of the handle and in particular also to simplify the pushing of the brush cutter with the sole of the foot, it is advantageously provided that at least one handle has a rubber part in at least one section of the rod. Preferably, the rubber part extends at least partially, in particular completely, on the sole of the foot support. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is an explanation of the embodiments of the present invention with reference to the accompanying drawings.

[0017] Figure 1 A schematic perspective view showing an operator and a brush cutter;

[0018] Figure 2 Show Figure 1 A perspective view of a first handle of a brush cutter;

[0019] Figure 3 Show Figure 2 A side view of the outer side of the handle;

[0020] Figure 4 Shown in Figure 3 The section through the handle in the direction of line IV-IV;

[0021] Figure 5 The rear side of the handle is shown in Figure 3 A side view in the direction of arrow V;

[0022] Figure 6 The inner side of the handle is shown in Figure 5 A side view in the direction of arrow VI;

[0023] Figure 7 Shown along Figure 6 A partial cross-sectional view along line VII-VII in FIG.

[0024] Figure 8 Shown along Figure 6 A partial cross-sectional view taken along line VIII-VIII in FIG.

[0025] Fig. 9 The front side of the handle is shown in Figure 3 A side view in the direction of the middle arrow IX-IX;

[0026] Fig.10 A perspective schematic diagram showing the thumb support surface of the handle;

[0027] Fig.11A schematic diagram showing an operating path of a third operating element of the handle;

[0028] Fig.12 A perspective view showing a third operating element in an unactuated position;

[0029] Fig.13 A perspective view showing the third operating element in an actuated position;

[0030] Figures 14 to 18 A schematic diagram showing different possible hand gestures at a first handle;

[0031] Fig.19 showing a side view of the second handle;

[0032] Fig. 20 Shown along Fig.19 The line XX-XX in the middle passes through the section of the thenar support of the second handle;

[0033] Fig.21 and 22 showing a perspective view of a second handle;

[0034] Fig.23 The rear side of the second handle is shown in Fig.19 A side view in the direction of arrow XXIII;

[0035] Fig.24 The outer side of the handle is shown in Fig.23 A side view in the direction of arrow XXIV;

[0036] Fig.25 Shown along Fig.19 A partial cross-sectional view of the line XXV-XXV passing through the thumb support surface;

[0037] Fig.26 A side view of a handlebar with two handles of a brush cutter is shown;

[0038] Fig. 27 Shown along Fig.26 A sectional view of the second handle on the left side through line XXVII-XXVII;

[0039] Fig.28 Shown along Fig.26 The line XXVII-XXVIII in the cross-sectional view passes through the first handle on the right. DETAILED DESCRIPTION

[0040] Figure 1A user 51 is schematically shown, who carries a handheld work tool, namely a brush cutter 1. The brush cutter 1 has a guide tube 2. A tool unit 3, in the present embodiment a tool head with a cutting tool 70, is arranged at the end 42 of the guide tube 2. A housing 4 is arranged at the other end 73 of the guide tube. In the present embodiment, a schematically shown drive motor 26 is arranged in the housing 4. The drive motor 26 can be, for example, an electric motor, in particular an electric motor supplied with energy by a battery, or an internal combustion engine.

[0041] The operator 51 carries the brush cutter 1 with the aid of a harness 74. The weight of the brush cutter 1 is at least partially, in particular largely, borne by the harness 74 during operation. The harness 74 holds the brush cutter 1 at the suspension point A. The brush cutter 1 is advantageously suspended on the harness 74 in such a way that the brush cutter 1 hangs freely on the harness 74 in the working position, i.e. in the position in which the tool unit 3 is arranged further below the housing 4. Figure 1 The center of gravity S of the brush cutter 1 and the weight F are schematically drawn in. The center of gravity S of the brush cutter 1 is advantageously shifted toward the tool unit 3 relative to the suspension point A. The brush cutter 1 is thus suspended on the harness 74 such that the tool unit 3 is arranged lower than the housing 4 of the brush cutter 1 .

[0042] To guide the brush cutter 1, a handle 5 is fixed to the guide tube 2. During operation, the force for advancing the tool is introduced via the handle 5. The advancing movement can be, for example, a reciprocating movement during mowing or an up and down striking movement during shredding operation. The direction of movement during mowing is Figure 1 It is schematically indicated by a double arrow M in the figure, and the direction of movement during crushing is indicated by a double arrow H.

[0043] The handlebar grip 5 is a so-called bicycle handlebar. The handlebar grip 5 comprises a handlebar crossbar 43. The handlebar crossbar 43 preferably extends approximately transversely to the guide tube 2. A handle 6 or 7 is arranged at each end of the handlebar crossbar 43. The handles 6 and 7 have inner sides 29 arranged facing each other. The handles 6 and 7 have outer sides 28 facing away from each other. The outer sides 28 of the handles 6 and 7 are placed against the palm 52 of the user 51. The inner sides 29 are thus the sides of the handles 6 and 7 that are close to each other, while the outer sides 28 are the sides of the handles 6 and 7 that are away from each other.

[0044] Figures 2 to 18 A first handle 6 is shown, in this embodiment the right-hand handle. Figures 19 to 25 A second handle 7 is shown, which in the present exemplary embodiment forms the left-hand handle of the brush cutter 1. The handles 6 and 7 can also be used in other handheld working tools, in particular blowers, spray tools and the like.

[0045] like Figure 2As shown, the first handle 6 has a rod 8. The rod 8 has a fixed end 9 and a free end 10. In the normal working posture of the brush cutter 2, the free end 10 points to the front and upward. In the present embodiment, a receptacle 44 is constructed at the fixed end 9, into which the handle crossbar 43 is inserted. The center axis of the receptacle 44 advantageously overlaps with the longitudinal axis 14 of the handle 6. In the present embodiment, the rod 8 of the handle 6 is composed of two half shells 71 and 72, which are in contact with each other in a dividing plane parallel to the longitudinal axis 40. The first handle 6 has a front side 27 extending between an outer side 28 and an inner side 29. The front side 27 is configured to be in contact with the fingers of the hand of the user 51. In addition, the handle 2 has a rear side 30, which is Figure 5 2 and is arranged opposite the front side 27. In the normal operating position, in the brush cutter, the rear side 30 faces the operator, while the front side 27 points in the direction of the tool unit 3.

[0046] In order to fix the handle 6 on the handle crossbar 43, a fixing screw (not shown) is advantageously provided, which passes through a fixing opening 59 in the handle 6. The fixing screw advantageously also passes through an opening in the handle crossbar 43 and thereby fixes the position of the handle 6 relative to the handle crossbar 43. Figure 2 The receiving portion 60 for fixing the nut is shown in FIG. Figure 3 As shown, the opposite outer side 28 has a receptacle 61 for a fastening screw, which can be screwed into a fastening nut on the opposite side of the handle 6 .

[0047] like Figure 2 It is also shown that a support surface 15 for the hand of a user 51 is formed at the free end 10 of the handle 6. The support surface 15 is circular in design and is adapted in size to the inner surface of the user's hand. Figure 2 It is also shown that the first handle 6 has a first operating element 11 and a third operating element 13 .

[0048] Figure 3 8 shows a second operating element 12 which is also arranged at the first handle 6. The rod 8 forms an elongated base of the first handle 6, on which the operating elements 11, 12 and 13 are arranged. The first operating element 11 is advantageously designed to control the drive motor 26. The first operating element 11 can be used to adjust the speed of the drive motor 26 and thus the speed of the tool. The second operating element 12 can advantageously prevent the drive motor 26 from being manipulated via the first operating element in the unoperated position, for example by blocking the first operating element 11. The third operating element can be, for example, a stop switch. However, other functions of the operating elements 11, 12 and 13 can also be advantageous.

[0049] like Figure 3As shown, the first operating element 11 protrudes from the rod 8 at the front side 27 with the operating section 23. The operating section 23 is the entire section of the first operating element 11 that protrudes from the rod 8 in the non-operated position of the first operating element 11. The first operating element 11 is arranged to be pivotable about a first pivot axis 21. The first pivot axis 21 is located closer to the free end 10 of the handle 6 than the operating section 23. The operating section 23 of the first operating element 11 has a first end 24 and a second end 25. The first end 24 is located closer to the fixed end 9 than the second end 25. The pivot axis 21 is located closer to the second end 25 of the operating section 23 than the first end 24. In the direction of the longitudinal axis 14, the pivot axis 21 is located closer to the free end 10 than the second end 25 of the operating section 23. The operating section 23 of the first operating element 11 has a length b measured in the direction of the longitudinal axis 14.

[0050] The second operating element 12 has an operating section 16 extending from the rod 8. The operating section 16 is the entire section of the second operating element 12 extending from the rod 8 in the non-operated position of the second operating element 12. The operating section 16 has a length c measured in the direction of the longitudinal axis 14. The lengths b and c can be approximately the same size. In the present embodiment, the length b is less than the length c.

[0051] The operating section 16 of the second operating element 12 has a first end 17 and a second end 18. The first end 17 is located closer to the fixed end 9 than the second end 18. The two operating sections 16 and 23 face the direction of the longitudinal axis 14. The second operating element 12 is arranged to be swingable about a swing axis 22. The swing axis 22 is located closer to the first end 17 of the operating section 16 than to the second end 18. In the present embodiment, in the direction of the longitudinal axis 14, the first end 17 has a greater distance from the fixed end 9 than the swing axis 22. In the present embodiment, the swing axis 22 is located between the first end 17 and the fixed end 9 in the direction of the longitudinal axis 14.

[0052] The operating sections 23 and 16 overlap in the length section 19 in the non-operated position of the operating elements 11 and 12. Both the operating section 23 and the operating section 16 extend in the length section 19, which has a length a measured in the direction of the longitudinal axis. The length a is advantageously at least 30% of the length b of the operating section 23 of the first operating element 11. The length a is preferably at least 50% of the length b.

[0053] The rod 8 of the first handle 6 has a grip section 45. The grip section 45 has an elongated, roughly cylindrical shape. In the direction toward the fixed end 9, a thickened section 46 is connected to the grip section 45. In the direction toward the free end 10, a thickened section 47 is connected to the grip section 45. The length t of the grip section 45 measured in the direction of the longitudinal axis 14 is advantageously one quarter to three quarters of the total length u of the handle 6. Here, the total length u is measured parallel to the longitudinal axis 14.

[0054] The handle 6 has a first half 48 extending from the fixed end 9 over half the length u. The handle 6 also has a second half 49, which is connected to the first half 48 and extends to the free end 10. The second half 49 extends over half of the length u. The grip section 45 is at least partially arranged in the first half 48. In the present embodiment, the grip section 45 extends in the first half 48 over at least 60% of its length t. The grip section 45 also extends into the second half 49. In the present embodiment, the overlap region 19 is completely arranged in the second half 49. It can also be arranged that the overlap region 19 partially extends into the first half 48.

[0055] The contact surface 15 transitions to the rear side 30 via a rounded portion 32. The rounded portion 32 is convex in design and extends in a circular shape in the present exemplary embodiment. Figure 3 In the side view of the outer side 28 shown in , the radius r of the circular portion 32 is at least 1.5 cm at any position, in particular at least 2 cm. A radius r of at least 3 cm is considered particularly advantageous. Here, the radius r can vary in the direction of the circular portion 32. Through the circular portion 32, a uniform transition from the rear side 30 to the support surface 15 is achieved. The hand of the user 51 can slide well along the circular portion 32. Due to the circular shape of the circular portion 32, a nearly constant spacing of the first operating elements 11 arranged opposite to each other can be maintained. This ensures that the user 51 can hold the operating element 11 in any set holding posture.

[0056] The rod 8 has a thenar support 33. The thenar support 33 is advantageously arranged at the grip section 45. Figure 3 As shown, the thenar support portion 33 has a length k measured parallel to the longitudinal axis 14. The length k is advantageously at least 2.5 cm, in particular at least 3.5 cm. In the present embodiment, the thenar support portion 33 extends to the vicinity of the thickened section 46.

[0057] Figure 4A section through the handle 6 is shown in the region of the thenar support 33. The section extends perpendicularly to the longitudinal axis 14. The thenar support 33 is formed as a ridge that protrudes outward from the otherwise advantageously approximately circular cross section of the grip section 45. In the present embodiment, the thenar support 33 extends at the medial side 29 and the rear side 30. Approximately in the region in which the medial side 29 and the rear side 30 adjoin each other, the thenar support 33 has its greatest radial extension. The thenar support 33 has an approximately planar thenar support surface 36. The thenar support surface 36 advantageously extends at the rear side 30. The thenar support 33 has a maximum spacing o from the longitudinal axis 14. Figure 4 The section in FIG. 1 extends in the region in which the thenar support 33 has a maximum distance o from the longitudinal axis 14. In the same section plane in which the maximum distance o exists, the handle 6 has a diameter p measured perpendicular to the maximum distance o. The maximum distance o is advantageously greater than half the diameter p. The maximum distance o is advantageously at least 0.7 times, in particular at least 0.8 times, the diameter p of the rod 8.

[0058] like Figure 4 It is also shown that the pivot axes 21 and 22 of the operating elements 11 and 12 are perpendicular to each other. The pivot axes 21 and 22 enclose an angle α that is advantageously less than 180°. The angle α is in particular less than 120°, preferably approximately 90°. In the present embodiment, the pivot axes 21 and 22 are spread out with the longitudinal axis 14 to form a coordinate system. The longitudinal axis 14 defines the y-direction of the coordinate system. The y-axis points from the fixed end 9 to the free end 10. The pivot axis 21 of the first operating element 11 corresponds to the z-axis, while the pivot axis 22 of the second operating element 12 corresponds to the x-axis. The x-axis is oriented from the rear side 30 to the front side 27. The z-axis is oriented from the inner side 29 to the outer side 28. The axes x, y and z form a right-handed system. The thenar support 33 extends in the negative z-direction and the negative x-direction. The thenar support surface 36 is inclined at an angle δ relative to the z-direction, which is advantageously less than 45°, in particular less than 30°, at any location. At the point at which the maximum distance o from the longitudinal axis 14 is present, the paramedian contact surface 36 has a distance v measured in the z direction which advantageously corresponds to at least 0.3 times the diameter p.

[0059] like Figure 5 and 6 As shown, the first handle 6 has a thumb surface 20. The thumb support surface 20 extends in a thickened section 47 at the inner side 29. The thumb support surface 20 has a width g measured perpendicular to the longitudinal axis 14. The thumb support surface 20 has a distance i measured in the direction of the longitudinal axis 14 from the free end 10. For the first handle 6, the distance i can be very small. The thumb support surface 20 can extend to the vicinity of the free end 10.

[0060] like Figure 5As shown, in the side view of the rear side 30 in the direction of the x-axis, the third operating element 13 is largely or completely hidden. The third operating element 13 is at least partially behind the thumb support surface 20 in this viewing direction. The third operating element 13 is covered by the cover 68. Figure 5 and 6 As shown, the third operating element 13 has a side surface 62 ( Figure 6 ). In the present embodiment, the third operating element 13 is oriented approximately parallel to the thumb support surface 20. The side surface 62 extends obliquely relative to the longitudinal axis 14. A recess 64 is formed on the handle 6 near the side surface 62, which facilitates the operation of the third operating element 13 at the side surface 62. In contrast to the recess 64, the third operating element 13 has a protrusion 63 at the side surface 62. The protrusion 63 is advantageously at least 1 mm, in particular at least 2 mm. As a result, the operating element 13 can also be reliably operated at the side surface 62 using gloves. Figure 5 It is also shown that the second operating element 12 has a distance e from the free end 10 measured parallel to the longitudinal axis 14 .

[0061] exist Figures 6 to 8 The orientation of the thumb support surface 20 is shown in FIG. Figure 6 As shown, the thumb support surface 20 is inclined at an angle β relative to the longitudinal axis 14 in the viewing direction toward the inner side 29 (i.e., when viewed in the direction of the z-axis). The angle β is at least 20° and at most 70° at any point of the thumb support surface 20. On the one hand, this allows an ergonomic hand position. On the other hand, due to the orientation of the thumb support surface 20, it is possible to achieve a very good introduction of forces ( Figure 1 ), thereby creating favorable force ratios, in particular for pushing and pressing tools.

[0062] exist Figure 6 In the side view shown, the thumb support surface 20 is preferably convexly curved. However, a flat or concavely curved design can also be advantageous. The thumb support surface 20 is located between two parallel planes 34 and 35. The planes 34 and 35 advantageously extend obliquely to the plane of the paper. The planes 34 and 35 do not extend parallel to the axes x, y and z of the coordinate system of the handle 6. The planes 34 and 35 are therefore Figure 6 Schematically shown in FIG. Here, the thumb support surface 20 is advantageously configured such that the distance h between the two planes 34 and 35 is less than 3 mm, in particular less than 2 mm. The width g of the thumb support surface 20 is advantageously at least 8 mm. Figure 6The length f of the thumb support surface 20 depicted in the drawing is advantageously at least 2.5 cm. Preferably, a length f of at least 3 cm, in particular at least 4 cm, is provided. Here, the length f and the width g are measured in the region between the planes 34 and 35. The surface sections adjoining the thumb support surface 20 outside the planes 34 and 35 are not currently considered to be part of the thumb support surface 20. The thumb support surface 20 advantageously has a curvature, the radius w of which is at least 10 mm, in particular at least 15 mm, advantageously at least 30 mm at any location. In the present embodiment, the radius of the curvature is at least 40 mm at any location. A planar design of the thumb support surface 20, i.e. an infinite radius, can also be advantageous. The thumb support surface 20 transitions to the inner side 29 of the handle 6 with a curvature 31. The curvature 31 is concavely configured.

[0063] like Figure 7 and 8 As shown, the thumb support surface 20 descends in the direction outward from the longitudinal axis 14. However, it may also be advantageous for the thumb support surface to rise slightly in this direction. In a sectional plane extending parallel to the longitudinal axis 14 and through the inner side 29 (i.e., a sectional plane in the yz plane), the thumb support surface 20 encloses an angle γ with the longitudinal axis 14 that is open toward the fixed end 9. The angle γ is advantageously 30º to 110º. Particularly preferably, the angle γ is 45º to 90º. The angle γ is preferably less than 90º. Figure 8 The projection 63 of the third operating element 13 that protrudes beyond the recess 64 can also be clearly seen. Figure 7 and 8 The design of the concave curvature 31 is shown. The curvature 31 has a radius s, which can be designed to be relatively small, ie less than 2 cm, in particular less than 1 cm. Here, the radius s does not have to be always the same size, but can vary, such as Figure 7 and 8 shown.

[0064] like Fig. 9 As shown, the actuating section 23 of the first actuating element 11 is at a distance d from the free end 10. The actuating section 16 of the second actuating element 12 is at a distance d from the free end 10. Figure 5 In the embodiment, the spacing e is greater than the spacing d. The spacing d and e are advantageously smaller than 7 cm, respectively. Thus, when the user 51 rests his hand on the support surface 15, the operating elements 11 and 12 can also be operated by the user 51.

[0065] Fig.10 FIG. 2 also shows the design of the thumb support surface 20 , the arch 31 and the inner side 29 adjoining thereto.

[0066] The second operating element 13 is arranged in such a way that even if the operator places his hand on the support surface 15 at the free end 10 of the lever 8, unintentional actuation of the second operating element 13 is avoided. Fig.11 Schematically, the second operating element 13 can, for example, operate a schematically shown switch 65. It can also be configured to operate a mechanical element. The switch 13 has a Fig.11 , the non-actuated position 39 and the actuated position 41, in which the switch 65 is completely actuated, are schematically shown in FIG. 1 . Between these positions, the operating element 13 can firstly travel an idle stroke 66. Within this idle stroke 66, the switch 65 is not actuated. The idle stroke 66 is followed by an actuating stroke 67, during which the switch 65 is pressed. The position of the third operating element 13, in which the operating element 13 has traveled the idle stroke 66 and has begun to carry out the actuating stroke 67, is now referred to as the actuating position 40. In order to prevent unintentional actuation of the switch 65, the actuating position 40, in which the actuating stroke 67 begins, is decisive. Actuation of the third operating element 30 within the idle stroke 66 is of no significance for the functioning of the brush cutter 1.

[0067] Fig.12 The third operating element 13 is shown in the unactuated position 39. In this exemplary embodiment, the second operating element 13 is covered by a cover 68 toward the thumb support surface 20 and the free end 10. The cover 68 is at least so large that the third operating element 13 in the actuated position 40 protrudes beyond the outer contour of the handle 6, 7 (i.e. beyond the cover 68) by a maximum of 1 mm when viewing the fastening end 9 in the direction of the longitudinal axis 14.

[0068] Fig.13 The third operating element 13 is shown in the operating position 41. In this embodiment, the operating element 13 is pressed deeper into the rod 8 than the recess 64, so that the recess 64 protrudes beyond the operating element 13 at the side 62. However, it can also be provided that the third operating element 13 ends in a plane with the bottom of the recess 64 or protrudes beyond the bottom. Due to the cover 68, the third operating element 13 can be moved out of the operating position 41 only when the operator actively presses the operating element 13. Fig.12 The unoperated position 39 shown in FIG. Fig.13 The operating position 41 shown in FIG. Due to the cover 68, unintentional operation is avoided.

[0069] Figures 14 to 18 Different possible gripping positions for the handle 6 are shown. Fig.14 The handle 6 is schematically shown, together with the hand 53 of the user 51 ( Figure 1 ). The hand 53 of the user 51 surrounds the grip section 45. The thenar eminence rests against the thenar eminence support 33. The palm 52 ( Fig.15) rests on the second operating element 12 and actuates it. The index finger 55 rests on the first operating element 11 and can actuate it. The middle finger 56, the ring finger 57 and the little finger 58 surround the grip section 45. For this hand posture, two possible positions for the thumb 54 are provided. Fig.15 An arrangement is shown in which the thumb 54 rests on the thumb support surface 20 and is supported thereon. Fig.16 In the position shown, the thumb 55 is located below the thickened section 47. The thumb 54 can surround the grip section 54 in this position. Fig.15 As shown, the thumb 54 can also operate the third operating element 13. In this case, the thumb 54 is located below the thickened portion 68 ( Fig.12 and 13 ).

[0070] like Fig.15 and 16 As shown in the view in the direction of the longitudinal axis 14 toward the fixed end 9, the third operating element 13 is completely covered by the cover 68 in this viewing direction. The third operating element 13 is not visible in this view. The thumb support surface 20 is advantageously designed to be relatively large. In the viewing direction of the longitudinal axis 14 toward the fixed end 9, the area of ​​the thumb support surface 20 is advantageously at least 10%, in particular at least 20%, preferably at least 25% of the total visible area of ​​the thickened section 47 of the first handle 6. Advantageously, in the viewing direction of the longitudinal axis 14 toward the fixed end 9, the area of ​​the thumb support surface 20 is less than 70%, in particular less than 50%, in particular less than 30% of the total visible area of ​​the thickened section 47 of the first handle 6.

[0071] exist Fig.15 1 shows the second operating element 12 in the operating position. In this position, the second operating element 12 advantageously protrudes only slightly or not at all from the outer contour of the rod 8. In the present embodiment, it is provided that the second operating element 12 protrudes beyond the outer contour of the rod 8 in the operating position with a protrusion j, which is at most 3 mm, in particular at most 2 mm. The protrusion j is advantageously no greater than 3 mm, in particular no greater than 2 mm, at any part of the second operating element 12.

[0072] Fig.17 The hand position is shown in which the hand 53 is partially supported on the support surface 15, more precisely advantageously with the inner side of the index finger 55. The middle finger 56 surrounds the thickening 47. The ring finger 57 and the little finger 58 are in contact with the first operating element 11 and can operate it. The palm 52 of the user 51 is arranged on the second operating element 12 and can operate the second operating element 12.

[0073] exist Fig.181 shows a hand gesture, in which the palm 52 of the hand 53 rests on the support surface 15. The second operating element 12 can be held by the little finger 58. The operation of the first operating element 11 is provided for the middle finger 56. The user 51 can also preferably operate with the index finger 55 or the ring finger 57. Since the distances d and e between the operating elements 11 and 12 and the free end 10 are less than 7 cm ( Figure 5 and 9 ), even in Fig.18 The hand position shown in FIG. 1 also allows easy actuation of the operating elements 11 and 12 .

[0074] Due to the continuous circle 32, the user 51 can switch between different hand positions by pushing the hand 53 along the circle 32. This also results in ergonomic work over a longer period of time.

[0075] Figures 19 to 25 The design of the second handle 7 is shown. The second handle 7 is advantageously the left handle. The second handle 7 has no operating elements in the present embodiment. The second handle 7 can thus be designed as a whole to be smaller than the first handle 6. The two handles 6 and 7 have different shapes. However, the second handle 7 also has a thumb support surface 20, a support surface 15 at the free end 10 and a thenar support surface 33, just like the first handle 6. For both handles, the same reference numerals indicate elements that correspond to each other.

[0076] The second handle 7 also has a rod 8 with a fixed end 9 and a free end 10. A not shown receptacle 44 for a handle crossbar 43 is provided at the fixed end 9. The second handle 7 also has a longitudinal axis 14 which advantageously overlaps with the y-axis. The y-axis points from the fixed end 9 to the free end 10. The x-axis extends from the rear side 30 to the front side 27. Fig. 20 As shown, the z-axis points from the outer side 28 to the inner side 29. These axes form a right-handed system.

[0077] like Fig.19As shown, the thumb support surface 20 encloses an angle β with the longitudinal axis 14. For the second handle 7, the angle β is also at least 20° and at most 70°. In the present embodiment, the angle β for the second handle 7 is slightly greater than the angle β for the first handle 6. By arranging the third operating element 13 in the second handle 7 in a manner not adjacent to the thumb support surface 20, the orientation of the thumb support surface 20 can be freely selected. The thumb support surface 20 of the second handle 7 is between planes 34 and 35, which advantageously have a spacing h of less than 3 mm, especially less than 2 mm. In the present embodiment, the thumb support surface 20 is slightly concavely arched. The convex section is connected to the concave section. The arched portion of the thumb support surface 20 has a radius w at any position, which is at least 10 mm, especially at least 15 mm. The minimum radius w of the second handle 7 is especially smaller than the minimum radius w of the first handle 6. The design of the plane of the thumb support surface 20 can also be advantageous. The thumb support surface 20 has a spacing e from the free end. In the present embodiment, the distance e is at least 1 cm for the second handle 7. The thumb support surface 20 has a length f, which is at least 2.5 cm, in particular at least 3 cm. The thumb support surface 20 has a width g, which is advantageously at least 8 mm, in particular at least 1 cm.

[0078] exist Fig. 20 The design of the thenar support 33 is shown in detail in FIG. The thenar support 33 forms a thenar support surface 36, which extends at the rear side 29 of the second handle 7. The thenar support surface 36 is approximately flat and can be slightly concavely curved in a section plane parallel to the longitudinal axis 14. A convex curvature is also possible. The maximum spacing o and its ratio to the diameter p correspond to the case of the first handle 6. As Fig. 20 As shown, in the section plane shown perpendicular to the y-axis, the thenar support surface 36 is inclined at an angle δ relative to the zy-plane. The angle δ of the thenar support surface 36 of the second handle 7 can be greater than the angle δ for the first handle 6. The same angle δ can also be set.

[0079] exist Fig.21 The width g and the length f of the thumb support surface 20 can be clearly seen in FIG. Fig. 22 As shown, the support surface 20 transitions to the inner side 29 with a curvature 31 which is significantly larger than in the case of the first handle 6. Fig.23 and Fig.25 It can also be seen in Fig.25 As shown, the radius s of the curvature 31 is advantageously greater than 2 mm, in particular greater than 5 mm. In a section plane 20 parallel to the longitudinal axis 14 , the thumb support surface 20 encloses an angle γ with the longitudinal axis 14 , which corresponds to the angle γ described for the first handle 6 .

[0080] like Fig.24 As shown, the thenar support surface 36 is arranged in the first half 48 of the grip section 45. Fig.24 As also shown, the thenar bearing surface 36 has a length k measured in the direction of the longitudinal axis 14. Fig.24 As shown, the thenar support surface 36 has a length k measured in the direction of the longitudinal axis 14. The length k is advantageously at least 2.5 cm, in particular at least 3.5 cm. Fig.24 The length u of the second handle 7 is preferably smaller than the length u of the first handle 6 .

[0081] Fig.26 The design of the handle grip 5 is shown. A fastening device 75 is shown on the handle crossbar 43, with which the handle crossbar 43 can be fastened to the guide tube 2. The fastening device 75 advantageously allows the position of the handle crossbar 43 to be adapted in the longitudinal direction of the guide tube 2 and / or allows the handle crossbar 43 to be pivoted about the fastening device 75, so that the inclination of the handle crossbar 43 and the inclination of the handles 6 and 7 can be adjusted in this way. Fig.26 Also shown are the movement directions M for the harvesting operation and H for the comminution operation.

[0082] Fig. 27 and 28 Accordingly, a section through the thenar support 33 is shown in the region in which the thenar support 33 has a maximum distance o from the longitudinal axis 14 .

[0083] like Fig. 27 As shown, the thenar support surface 36 of the second handle 7 has a width m. The width m is advantageously at least 8 mm, in particular at least 1 cm. The thenar support surface 36 is located between two planes 37 and 38 extending parallel to each other, spanning the width m and the length k. The two planes 37 and 38 have a spacing n of advantageously less than 3 mm from each other. The length k and the width m are measured in the region of the thenar support surface 36 between the planes 37 and 38.

[0084] like Fig.28 As shown, the thenar support surface 36 of the first handle 6 has a width m, which is advantageously at least 8 mm, in particular at least 1 cm. The thenar support surface 36 is located between two parallel planes 37 and 38, the distance n between these planes advantageously being at most 3 mm. Figure 3 ) and width m are measured in the region of the thenar support surface 36 between planes 37 and 38.

[0085] like Fig. 27 and 28It is also shown that the thenar support surface 36 (in particular the thenar support surface 36 of the first handle 6) has a radius q in the shown section plane perpendicular to the longitudinal axis 14, which is at least 10 mm, in particular at least 15 mm at any position. Here, the thenar support surface 36 can extend concavely and / or convexly in the shown section plane. The direction of at least the plane in sections or the direction of the continuous plane can also be advantageous. In particular, a smaller radius can also be set for the thenar support surface 36 of the second handle 7. The radius q of the middle concave area is advantageously at least 10 mm, in particular at least 15 mm. The convex area connected to it in the circumferential direction can have a radius of less than 10 mm.

[0086] Due to the orientation of the thenar support surface 36, a good force introduction in the force direction B can be achieved via the thenar support surface 36. The force directions B of the two handles 6 and 7 can extend obliquely relative to each other, such as Fig. 27 and 28 As shown. The force direction B advantageously extends transversely to the paracromial support surface 36. The force direction B extends in particular perpendicularly to the planes 37 and 38. The paracromial support surface 36 is advantageously oriented transversely (in particular perpendicularly) to the direction toward the tool unit 3. As a result, forces can be introduced well in the direction toward the tool unit 3 via the paracromial support surface 36.

[0087] By pressing on the apical bearing surface 36 of the handles 6, 7 and holding or pulling on the other handle 6, 7, force can be introduced in a simple and ergonomic manner in the direction of motion M for the harvesting operation. By pressing on the apical bearing surface 36, in particular on the apical bearing surface 36 of both handles 6, 7, the tool unit 3 can also be pressed downward, thereby introducing force in the direction of motion H for the shredding operation in a good and ergonomic manner.

[0088] The thenar support 33 is designed as a bulge extending on the inner side 29 and the rear side 30 of the rod 8. For both handles 6, 7, the thenar support 33 is at least partially, in particular completely, arranged in the first half 48 of the respective handle 6, 7. Fig. 20 For the second handle 7, the handle 7 has a rubber part 69. Advantageously, each handle 6, 7 has a rubber part at least in one section, in particular along the entire outer surface of the rod 8. This achieves a better hold of the hand 52 of the user 51 on the handle 6, 7.

[0089] The other features of the second handle 7 correspond to those of the first handle 6 , to which reference is made to the description thereof.

[0090] A handle with a supine support can also be advantageous for other tools, in particular for blow-off tools. A handle with a supine support can be advantageous for tools with a handle. A handle with a supine support can be advantageous for blow-off tools carried on the back.

Claims

1. A brush cutter having a guide tube (2), in, A tool unit (3) is arranged at the end (42) of the guide tube (2), wherein a handle crossbar (43) is fixed to the guide tube (2), the handle crossbar carrying a handle (6, 7) at each end, wherein each handle (6, 7) has a rod (8) with a fixed end (9) and a free end (10), at the fixed end the handle (6, 7) is fixed to the handle crossbar (43), wherein each handle (6, 7) has a front side (27) facing the tool unit (3) and an opposite rear side (30), wherein the handles (6, 7) have inner sides (29) facing each other and outer sides (28) facing away from each other, Characterized in that at least one of the handles (6, 7) has a thenar support portion (33), which is configured as a ridge extending on the inner side (29) and the rear side (30) of the rod (8), and the thenar support portion (33) has a thenar support surface (36) located between two planes, the spacing (n) between these planes is less than 3 mm, the length (k) of the thenar support surface (36) measured in the direction of the longitudinal axis (14) of the handles (6, 7) is at least 2.5 cm, and the width (m) of the thenar support surface (36) is at least 8 mm.

2. A brush cutter having a guide tube (2), in, A tool unit (3) is arranged at the end (42) of the guide tube (2), wherein a handle crossbar (43) is fixed to the guide tube (2), the handle crossbar carrying a handle (6, 7) at each end, wherein each handle (6, 7) has a rod (8) with a fixed end (9) and a free end (10), at the fixed end the handle (6, 7) is fixed to the handle crossbar (43), wherein each handle (6, 7) has a front side (27) facing the tool unit (3) and an opposite rear side (30), wherein the handles (6, 7) have inner sides (29) facing each other and outer sides (28) facing away from each other, It is characterized in that at least one of the handles (6, 7) has a thenar support (33), which is configured as a ridge extending on the inner side (29) and the rear side (30) of the rod (8), and the maximum distance (o) between the thenar support (33) and the longitudinal axis (14) of the handle is at least 0.7 times the diameter (p) of the rod (8) measured perpendicular to the maximum distance (o) and perpendicular to the longitudinal axis (14).

3. The brush cutter according to claim 1, It is characterized in that The rear side surface (30) has a radius (q) of at least 10 mm at any location in a section plane perpendicular to the longitudinal axis (14) at the thenar support surface (36).

4. The brush cutter according to claim 1, It is characterized in that The rear side (30) is designed to be approximately flat at the thenar contact surface (36) in a section plane perpendicular to the longitudinal axis (14).

5. The brush cutter according to claim 1, It is characterized in that The supramaxillary support (33) is arranged in the half (48) of the handle (6, 7) adjacent to the fixed end (9).

6. The brush cutter according to claim 1, It is characterized in that The two handles (6, 7) have different shapes.

7. The brush cutter according to claim 1, It is characterized in that The right handle (6) is configured to be larger than the left handle (7).

8. The brush cutter according to claim 1, It is characterized in that At least one handle (6, 7) has a rubber portion (69) in at least one section of the rod (8).

9. The brush cutter according to claim 1, It is characterized in that The handle (6) with the supine contact surface (36) has a first operating element (11) which is mounted so as to be pivotable about a first pivot axis (21).

10. The brush cutter according to claim 9, It is characterized in that The thenar support surface (36) is inclined at an angle (δ) relative to the first pivot axis (21) in a section plane perpendicular to the longitudinal axis of the handle (6), and the angle is less than 45° at any position.

11. The brush cutter according to claim 10, It is characterized in that The brush cutter (1) has a housing (4) in which a drive motor (26) is arranged, wherein the rotational speed of the drive motor (26) and thus of the tool can be adjusted by means of the first operating element (11).

12. The brush cutter according to claim 9, It is characterized in that The handle (6) with the thenar support surface (36) has a third operating element (13).

13. The brush cutter according to claim 9, It is characterized in that The brush cutter (1) comprises a housing (4) in which a drive motor (26) is arranged, the first operating element (11) being designed for operating the drive motor (26), the handle (6) having the hemisphere support surface (36) having a second operating element (12) which, in an unoperated position, can prevent the drive motor (26) from being operated via the first operating element (11), wherein the second operating element (12) comprises an operating section (16) which projects from the rod (8), wherein the operating section (16) of the second operating element (12) comprises a first end (17) and a second end (18), wherein the first end (17) is closer to the fixing end (9) than the second end (18), wherein the second operating element (12) is mounted so as to be pivotable about a second pivot axis (22), wherein the second pivot axis (22) is closer to the first end (17) than the second end (18) of the operating section (16).

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