WO2011056100A1

WO2011056100A1 - Cutting head for hand-held motor driven tools and a handheld battery powered working tool provided with a cutting head

Info

Publication number: WO2011056100A1
Application number: PCT/SE2009/051245
Authority: WO
Inventors: Johan Svennung; Patrik JÄGENSTEDT
Original assignee: Husqvarna Ab
Priority date: 2009-11-04
Filing date: 2009-11-04
Publication date: 2011-05-12

Abstract

The present invention relates to a cutting head (10) for a hand-held battery powered tool, such as a grass trimmer. The cutting head (10) includes a first cutting means carrier (18a) and a second cutting means carrier (18b). The first cutting means carrier (18a) is arranged to rotate along with a first cutting means (20a) about a first axis of rotation (22a). Similarly, the second cutting means carrier (18b) is arranged to rotate along with a second cutting means (20b) about a second axis of rotation (22b). The first axis of rotation (22a) is separated from the second axis of rotation (22b). The application also includes a hand-held battery powered working tool provided with a cutting head.

Description

Cutting head for hand-held motor driven tools and a hand^¬ held battery powered working tool provided with a cutting head.

Technical field

The invention relates to cutting heads for hand-held motor-driven tools, such as vegetation trimmers. In particular, it relates to cutting heads for battery powered grass trimmers.

Background

Vegetation trimmers are well-known power tools suitable for use in cutting vegetation, such as grass. Typically, such vegetation trimmers comprise a cutting head in which a rotor is arranged to be rotatably driven by a motor. The motor may be positioned in the cutting head or in another part of the trimmer. A cutting element, such as a cutting line or one or several cutting blades, is supported by the rotor. As the rotor rotates, an operative part of the cutting element, extending radially from the axis of the rotation of the rotor, is rotated as well, and will cut any light vegetation or grass that comes into its path.

The motor of the vegetation trimmer may be electrically or petrol driven, and if electrically driven, may be powered by mains electricity or by a battery pack. In known battery powered vegetation trimmers of this type, a battery pack powers an electric motor. A battery driven grass trimmer of this type is shown in EP 0 575 504 81 .

As the use of battery powered grass trimmers increases, the

requirements of the market become higher regarding the performance of trimmers of this type. The perfomance of a grass trimmer might concern the battery running time as well as the radial range of the cutting element.

For the convenience of the operator it is desirable to achieve a running time that is as long as possible before the battery needs to be recharged. One possibility is to use larger batteries. A problem with the use of larger batteries is that they are expensive and heavy. In order to reduce the time requested to treat a certain area of vegetation, and/or in order to increase the area that can be treated within a certain amount of time, the cutting diameter of the cutting element might be enlarged. The cutting diameter of the cutting element can be enlarged by making the operative part of cutting element longer and/or by extending the diameter of the rotor from which the operative part of the cutting element extends. However, both these alternatives have an injurious effect on the the aerodynamical properties of the rotor and cutting element, thus reducing the running time of the battery. Moreover, the use of long cutter blades gives rise to some practical difficulties.

Therefore, there remains a need for an improved battery powered vegetation trimmer, having an improved performance regarding battery running times as well as radial range of the cutting element. Summary

In view of the above, it is an objective to solve or at least reduce the problems discussed above. In particular, an objective is to provide an improved battery powered hand-held working tool, such as a grass trimmer, that achieves a longer running time of the battery without increasing a time required to process a certain area of vegetation.

This is achieved with a novel cutting head according to the preamble of claim 1 in which the cutting head includes a first cutting means carrier and a second cutting means carrier. The first cutting means carrier is arranged to rotate along with a first cutting means about a first axis of rotation. Similarly, the second cutting means carrier is arranged to rotate along with a second cutting means about a second axis of rotation. The first axis of rotation is separated from the second axis of rotation. The use of two cutting means, instead of a single larger cutting means, reduces a total sweep area of the cutting means. Thus, aerodynamic drag on the two cutting means is lesser than the aerodynamic drag on the single larger cutting means. The cutting head also enables the use of small aerodynamically shaped cutting means with less weight. The aforementioned factors also result in lower power consumption and hence, longer running time of the battery or batteries. According to claim 2, the first axis of rotation is essentially parallel to the second axis of rotation.

According to claim 3, the first and second cutting means carriers are arranged to rotate in one common plane P1 .

According to claim 4, a plane P2, which intersects the first and second axes of rotation of the first and second cutting means, is essentially perpendicular to a main direction of motion if the cutting head during operation of the hand-held battery powered tool. The orientations of the planes P1 and P2 imply that a combined effective cutting area of the first and second cutting means, in the main direction of motion of the cutting head, is substantially similar to a cutting area of a single larger cutting means. Thus, a time needed to process a certain area of vegetation is not increased by using two cutting means instead of a single larger cutting means.

According to claim 5, the cutting head includes at least one electrically driven driving means having an output shaft. The output shaft is rotatable upon energization of the driving means. The rotation of the output shaft is arranged to the cause the rotation of at least one cutting means carrier. In an aspect of the present invention, the at least one electrically driven driving means is an electric motor. Thus, the rotational speed of the output shaft may be controlled. The electric motor may also include one or more sensors to aid in control and/or detection of one or more abnormal conditions.

According to claim 6, only one electrically driven driving means is arranged to cause the rotation of the first and second cutting means.

The cutting means can be of different types. In various aspects of the present invention, at least one of the cutting means can be a flexible line member, a cutter blade, according to claims 7 and 8.

According to claim 9, the hand-held battery powered tool, which is configured for cutting or trimming vegetation, includes a handle portion, a cutting head according to any of the claims 1 -8, and an elongated tubular rod. The elongated tubular rod is utilized for positioning if the cutting head at a convenient distance from the handle portion. According to claiml O, the cutting head is rotatably connected to the elongated tubular rod. This enables the cutting head to be manipulated easily, especially on an uneven terrain. Brief description of the drawings

The invention will in the following be described in more detail with reference to the enclosed drawings, wherein:

Figure 1 shows a perspective view of an example hand-held battery powered tool incorporating some aspects of the present invention;

Figure 2a shows a perspective view of a cutting head employed in the hand-held battery powered grass trimmer, in accordance with an example embodiment of the present invention;

Figure 2b shows a side view of the cutting head, in accordance to an embodiment of the present invention;

Figure 2c shows a rear view of the cutting head, in accordance with an embodiment of the present invention; and

Figure 3 shows a schematic view of sweep areas of a first cutting means and a second cutting means which are employed in the hand-held battery powered grass trimmer, in accordance with an embodiment of the present invention.

Description of embodiments

The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which example embodiments of the invention incorporating one or more aspects of the present invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. For example, one or more aspects of the present invention can be utilized in other embodiments and even other types of devices. In the drawings, like numbers refer to like elements. Figure 1 shows a perspective view of an example hand-held battery powered grass trimmer 100 incorporating some aspects of the present invention. Although the described example in figure 1 is a grass trimmer, it should be understood that the present invention could be incorporated into any suitable type of power tool or hand-held power driven working tool and is not limited to merely use in a grass trimmer and, may be incorporated in different types of embodiments. In addition, any suitable size, shape or type of elements or materials could be used.

The grass trimmer 100 as shown in the figure 1 may include an elongated tubular rod 2 that has a first end 4 and a second end 6. The first end 4 may be attached to a handle portion 8 while the second end 6 may be coupled to a cutting head 10. Further, the elongated tubular rod 2 may provide a convenient distance between the handle portion 8 and the cutting head 10 that permit an easy manipulation of the cutting head 10. In an example embodiment of the present invention, the elongated tubular rod 2 may be detachably connected with the handle portion 8 and/or the cutting head 10. Moreover, the elongated tubular rod 2 may be telescopically attached with the handle portion 8 and/or the cutting deck 10 such that the distance between the handle portion 8 and the cutting head 10 may be adjustable to suit various needs. Further, in one example embodiment of the present invention, the elongated tubular rod 2 may be hollow to reduce weight and to encase various driving and control components (not shown in the figure).

In an embodiment of the present invention, the handle portion 8 may include a handle housing 12 and a battery pack 14. The handle housing 12 may be made of metal, plastic or the like. In an embodiment of the present invention, the handle housing 12 may include a rear handle 15. The rear handle 15 may be an integral part of the handle housing 12 or may be a separate component, which is affixed to the handle housing 12. Additionally, the handle housing 12 may include various control and indicator means (not shown in the figure), such as an on/off switch, a speed regulator, a mode selector, a battery charge indicator, a speed indicator, or the like. In an exemplary embodiment of the present invention, the battery pack 14 may be removably attached to the handle housing 12. This may enable the battery pack 14 to be charged at a remote location and then coupled to the handle housing 12. The battery pack 14 may include one or more batteries, which may include, but may not be limited to, lithium-ion batteries, nickel-cadmium batteries, or the like. In an embodiment of the present invention, the elongated tubular rod 2 may include one or more electrically conductive members (not shown in the figure) which may extend from the first end 4 to the second end 6. The electrically conductive members may be utilized to electrically couple the cutting head 10 with the battery pack 14. The one or more electrically conductive members may be provided on the inner surface of the elongated tubular rod 2 to prevent accidental contact, protect the conductive members from damage during operation and preclude exposure of the conductive members to detrimental elements such as moisture.

As shown in the figure 1 , the grass trimmer 1 may also include an assist handle 16 that may be affixed to the elongated tubular rod 2 at an intermediate location which is between the handle portion 8 and the cutting head 10. In certain embodiments of the present invention, the assist handle 16 may be in the shape of a closed loop. Further, the location of the assist handle 16, along a length of the elongated tubular rod 2, may be adjustable such that a distance between the rear handle 15 and the assist handle 16 may be altered to suit various needs. Additionally, suitable vibration damping means, such as, but not limited to, springs, rubber isolators, or the like, may be provided at an interface between the elongated tubular rod 2 and the assist handle 16. The vibration damping means may substantially reduce the transmission of vibrations from the elongated tubular 2 to the assist handle 16.

As shown in figure 1 , the grass trimmer 100 may have mutually perpendicular axes X1 , Y1 and Z1 . The elongated tubular rod 2 may be disposed substantially parallel to the X1 axis. In an embodiment of the present invention, the cutting head 10 may be rotatably connected to the second end 6 of the elongated tubular rod 2, such that an angular movement of the cutting head 10 may be permitted around one or more of the axes X1 , Y1 or Z1 . This may aid in the manipulation of the cutting head 10, especially on an uneven terrain. The cutting head 10 may be rotatably connected to the elongated tubular rod 2 by means of, but not limited to, a universal joint, a hinge joint, or the like. Additionally, in various embodiments of the present invention, the extent of the angular movement may be controlled or set within predetermined limits. Further, suitable vibration damping means, such as, but not limited to, springs, rubber isolators, or the like, may be provided at an interface between the elongated tubular rod 2 and the cutting head 10. The vibration damping means may substantially reduce the transmission of vibrations from the cutting head 10 to the elongated tubular rod 2.

As shown in figure 1 , a safety guard 17 may be disposed near a second end 6 of the elongated tubular rod 2. Typically, the safety guard 17 may prevent debris and the cutting head 10 to come in contact with an operator of the grass trimmer 100.

Figures 2a, 2b and 2c show a perspective view, a side view and a rear view of the cutting head 10 respectively. The cutting head 10 may include a first cutting means carrier 18a and a second cutting means carrier 18b that are configured to rotate about a first axis of rotation 22a and a second axis of rotation 18b respectively. In an embodiment of the present invention, the first and second cutting means carrier 18a and 18b may have, but not limited to, a disc-like shape. The cutting means carrier 18a and 18b may be made of metal, plastic or the like. In an embodiment of the present invention, a perpendicular distance between the first cutting means carrier 18a and the second end 6 of the elongated tubular rod 2 may be g reater than a perpendicular distance between the second cutting means carrier 18b and the second end 6 of the elongated tubular rod 2.

A first cutting means 20a and a second cutting means 20b may be mounted on the first cutting means carrier 18a and the second cutting means carrier 18b respectively, such that the cutting means 20a and 20b may extend in a radially outward direction with respect to the axes of rotation 22a and 22b. As a result, the cutting means 20a and 20b may rotate with the cutting means carrier 20a and 20b about the first and second axes of rotation 22a and 22b respectively. The cutting means 20a and 20b may be mounted on the cutting means carrier 18a and 18b such that the first axis of rotation 22a and the second axis of rotation 22b may be essentially an axis of symmetry for the cutting means 20a and 20b respectively. However, in certain embodiments of the present invention, the cutting means 20a and 20b may be asymmetrically mounted on the cutting means carrier 18a and 18b. The first and second cutting means 20a and 20b may be attached to the first and second cutting means carrier 18a and 18b by various means, such as, but not limited to, welding, brazing, adhesives, or the like. The cutting means carrier 18a and 18b may also include slots to aid in the attachment of the cutting means 22a and 22b. In an embodiment of the present invention, the cutting means 20a and 20b may be of substantially same dimensions with a length L. However, in another embodiment of the present invention, the cutting means 20a and 20b may be of dissimilar dimensions. In an embodiment of the present invention, one or more of the cutting means 20a and 20b may extend by a length L/2 in the radially outward direction on both sides of the axes of rotation 20a and 20b. In another embodiment of the present invention, one or more of the cutting means 20a and 20b may include two identical cutting members disposed on both sides of the axes of rotation 20a and 20b. Each of the cutting members may be of the length L/2. A person skilled in the art may acknowledge that there are no limitations on the number of cutting means and the corresponding number of cutting means carriers, and the example shown in the present invention is merely for illustration purposes and does not limit the scope of the invention.

In an embodiment of the present invention, at least one of the cutting means 20a and 20b may be a flexible line member, such as, but not limited to, a filament cutter. In another embodiment of the present invention, at least one of the cutting means 20a and 20b may be a cutter blade. The cutting means 20a and 20b may be made of metal, plastic, composite or the like. In certain embodiments of the present invention, at least one of the cutting means 20a and 20b may include a suitable coating to reduce wear, enhance cutting performance, or the like. Additionally, at least one of the cutting means 20a and 20b may be specially designed to reduce power consumption, increase cutting life, improve cutting action etc.

As shown in the figures 2a, 2b and 2c, the cutting head 10 may have three mutually perpendicular axes X2, Y2 and Z2 which may or may not be coincident with axes X1 , Y1 and Z1 . An X2-Y2 plane may essentially lie in the plane of the paper. The Z2 axis may be essentially parallel to an axis which is perpendicular to the plane of the paper. Consequently, an Y2-Z2 plane may be substantially parallel to a plane, which is perpendicular to the plane of the paper. During operation of the grass trimmer 100, a main direction of motion M of the cutting head 10 may be essentially parallel to the Z2 axis. A person skilled in the art may acknowledge that the main direction of motion M may also be essentially oriented at an angle of 180 degrees with respect to the axis Z2, without deviating from the essence of the present invention. In an embodiment of the present invention, the first axis of rotation 22a and the second axis of rotation 22b may be essentially parallel to one another and are offset by a distance D along an X2 axis. The distance D is at least equal to or more than the length L of the cutting means 20a or 20b. In case, the cutting means 20a and 20b are of dissimilar lengths, the distance D is at least equal to or more than an arithmetic mean of the respective lengths of the cutting means 20a and 20b.

In another embodiment of the present invention, the cutting means carrier 18a and 18b may be configured to rotate substantially in a common plane P1 . The plane P1 may be essentially parallel to the X2-Z2 plane. In yet another embodiment of the present invention, a plane P2, which intersects the axes of rotation 22a and 22b, may be essentially perpendicular to the main direction of motion M of the cutting head 10. Thus, the plane P2 may be essentially parallel to the X2-Y2 plane. In an embodiment of the present invention, the plane P2 may or may not be coincident with a plane X1 -Y1 .

In an embodiment of the present invention, the X2 axis may be oriented at a non-zero angle (not shown in the figures) with respect to the X1 axis in the plane P1 . Consequently, the cutting means carriers 18a and 18b may also be oriented at the non-zero angle with respect to the X1 axis in the plane P1 . In certain embodiments of the present invention, the non-zero angle may be adjustable by manual or automatic means. The non-zero angle may be adjusted to at least partially optimize cutting performance, power consumption etc. In another embodiment of the present invention, an angular orientation of the cutting means carriers 18a and 18b, relative to one another in at least one of the planes P1 and P2, may be adjustable.

As shown in figures 2a, 2b and 2c, the cutting head 10 may include a first electrically driven driving means 24a and a second electrically driven driving 24b. The electrically driven driving means 24a and 24b may include a first output shaft 26a and a second output shaft 26b respectively. In an embodiment of the present invention, the output shafts 26a and 26b may rotate upon energization of the corresponding electrically driven driving means 24a and 24b. The rotational speeds of the output shafts 26a and 26b may be similar or distinct. Further, the electrically driving means 24a and 24b may also be independently energized such that only one of the output shafts 26a and 26b may rotate. The cutting means carriers 18a and 18b may be configured to rotate with the output shafts 26a and 26b respectively. In an embodiment of the present invention, the cutting means carriers 18a and 18b may rotate at essentially the same rotational speed as corresponding output shafts 26a and 26b. The cutting means carriers 18a and 18b may be connected to the corresponding output shafts 26a and 26b by various means, such as, but not limited to, welding, brazing, adhesives or the like. In another embodiment of the present invention, transmission systems (not shown in the figures) may be provided at interfaces between the output shafts 26a and 26b, and the cutting means carriers 18a and 18b, such that the rotational speeds of the cutting means carriers 1 8a and 1 8b may be amplified or reduced by distinct ratios with respect to the rotational speeds of the corresponding output shafts 26a and 26b. The amplification or reduction ratios may at least partly depend on various parameters, for example, but not limited to, power consumption, cutting performance, terrain or the like. In another embodiment of the present invention, the transmission systems may be coupled with one another such that the change in the amplification or reduction ratio of one of the transmission systems may be relayed to the other transmission system. This may enable the changes in the rotational speeds, of the respective cutting means carriers 18a and 18b, to be synchronized.

In another embodiment of the present invention, one of the electrically driven driving means 24a or 24b may be present. Suitable transmission means (not shown in the figures) may be provided to transmit the rotation of one of the output shafts 26a or 26b to one or more of the cutting means carriers 18a and 18b. One or more of the cutting means carriers 18a and 18b may be selectively rotated based at least partly on various parameters, for example, power consumption, cutting performance, terrain etc. The cutting means carriers 1 8a and 1 8b may also be rotated at different rotational speeds. In an embodiment of the present invention, the transmission means may include one or more gears. Examples of gears may include, but not be limited to, spur gears, helical gears, bevel gears, worm gears, crown gears, planetary gears or belt drive.

In an embod iment of the present invention , at least one of the electrically driven driving means 24a and 24b may be any suitable electric motor, for example, but not limited to, AC induction motor, AC synchronous motor, stepper motor, brushless DC motor, brushed DC motor, servo motor etc. The electrically driven driving means 24a and 24b may be driven by electrical energy provided by the battery pack 14. In an embodiment of the present invention, openings may be provided, at the second end 6 of the elongated tubular rod 2, to permit wires to pass through and electrically link the electrically conductive members, present on the inner surface of the elongated tubular rod 2, to the electrical terminals of the electrically driven driving means 24a and 24b.

In an embodiment of the present invention, the cutting head 10 may include a covering (not shown in the figures) to enclose the wires and hence, prevent accidental contact with the wires, damage to the wires during operation and exposure of the wires to detrimental elements such as moisture. The covering may also be utilized to encase the electrically driven driving means 24a and 24b. In another embodiment of the present invention, the cutting head 10 may have integrated electrically conductive strips (not shown in the figures) which may couple the electrically conductive members to the electrical terminals of the electrically driven driving means 24a and 24b.

In an embodiment of the present invention, the electrically driven driving means 24a and 24b may be affixed to a connecting member 27. In the figures 2a and 2b, the connecting member 27 is i n the form of a rectangular plate. However, other shapes can be envisioned without deviating from the essence of the present invention. The connecting member 27 may be attached to the interface between the elongated tubular rod 2 and the cutting head 10, and thus may mechanically link the electrically driven driving means 24a and 24b to the elongated tubular rod 2. In an embodiment of the present invention, the output shafts 26a and 26b may extend through corresponding through holes (not shown in the figure) which may be provided in the connecting member 27. Moreover, clearances may be provided between the output shafts 26a and 26b, and the corresponding through holes. Suitable bearing means, such as, but not lim ited to, roller bearing, ball bearing, needle bearing, thrust bearing, fluid bearing, or the like may be present in the clearances to support the rotation of the output shafts 26a and 26b. Additionally, a suitable lubricant, such as, but not limited to, oil, grease, or the like, may be applied at the clearances to reduce frictional losses, protect against wear, and absorb generated heat during the rotation of the output shafts 26a and 26b.

In an embodiment of the present invention, energization of the electrically driven driving means 24a and 24b may be controlled independently by control means such as, but not limited to, one or more start/stop buttons present on the handle housing 12. Additionally, the rotational speeds of the output shafts 26a and 26b may be individually regulated by speed control means, for example, an analog dial or digital selectors. The electrical driven driving means 24a and 24b, and/or the output shafts 26a and 26b may include one or more sensors, for example, but not limited to, speed sensors, proximity sensors, current sensors, voltage sensors etc. Additionally, one or more sensors may be provided on the one or more cutting means carriers 18a and 18b and/or the one or more cutting means 20a and 20b. Safety devices, such as an emergency stop switch, may be provided to cut off electrical supply to the cutting head 10 in case one or more abnormal conditions are detected by one or more sensors. The one or more abnormal conditions may include, but not limited to, malfunction of the one or more electrically driven driving means 26a and 26b, detection of an obstacle, damage to the one or more cutting means carriers 18a and 18b and/or to the one or more cutting means 20a and 20b etc. A display panel may be provided on the handle housing 12 to show various parameters detected by the one or more sensors and/or to notify the one or more sensed abnormal conditions. An audible notification means, such as an alarm, may also be present to ind icate that the one or more abnormal conditions have been sensed.

Figure 3 shows a schematic view of the sweep areas of the first and second cutting means 20a and 20b. Each of the sweep areas of the first and second cutting means 20a and 20b may have a diameter equal to the length L. In an embodiment, the length L may be equal to 20 centimetres. In the figure, the plane P1 may essentially lie in the plane of the paper. The axes of rotation 22a and 22b of the cutting means 20a and 20b respectively may be parallel to an axis, which is perpendicular to the plane of the paper. Consequently, the plane P2 may also be perpendicular to the plane of the paper. As shown in the figure, the distance D between the axes of rotation 22a and 22b may be equal to the length L. A combined sweep area of the cutting means 20a and 20b may be equal to (TTL²)/2. In an embodiment of the present invention, the combined sweep area may be substantially equal to 628 cm². It is evident that the combined sweep area of the first and second cutting means 20a and 20b may be less than a sweep area of a single cutting means (not shown in the figure) with a length essentially equal to a length 2L. In particular, the combined sweep area may be essentially half of the sweep area of the single cutting means. However, a combined effective cutting area of the first and second cutting means 20a and 20b may be substantially equal to an effective cutting area of the single cutting means when the cutting head 10 is moved in the main direction of motion M. Typically, aerodynamic drag on any cutting means may at least partially depend on the sweep area of that particular cutting means. Thus, the first and second cutting means 20a and 20b may encounter less aerodynamic drag than the single cutting means without compromising on the effective cutting area. The exemplary numbers in this example embodiment are for illustrative purposes only and do not limit the scope of the present invention.

In the drawings and specification, there have been disclosed preferred embodiments and examples of the invention and, although specific terms are employed, they are used in a generic and descriptive sense only and not for the purpose of limitation, the scope of the invention being set forth in the following claims.

Claims

CLAIMS 1 . A cutting head for a hand-held battery powered tool, such as a grass trimmer, the cutting head (10) comprising:

a first cutting means carrier (18a), arranged to rotate therewith a first cutting means (20a) about a first axis (22a) of rotation;

a second cutting means carrier (18b), arranged to rotate therewith a second cutting means (20b) about a second axis (22b) of rotation,

the first axis (22a) of rotation being sepatared from the second (22b) axis of rotation.

2. The cutting head according to claim 1 , wherein the first axis (22a) of rotation is essentially parallel to the second axis (22b) of rotation.

3. The cutting head according to claim 2, wherein the first and the second cutting means carriers (18a, 18b) are arranged to rotate in one common plane (P1 ).

4. The cutting head according to any of claims 2 and 3, wherein a plane (P2) intersecting the axes of rotation (22a, 22b) of the first and second cutting means carriers (18a, 18b) is essentially perpendicular to a main direction of motion of the cutting head (10) during operation of the hand held battery powered tool (100).

5. The cutting head according to any of the preceding claims, wherein the cutting head (10) comprises at least one electrically driven driving means (24a, 24b), having an output shaft (26a, 26b), the output shaft (26a, 26b) being rotatable upon energization of the driving means (24a, 24b), wherein rotation of an output shaft (26a, 26b) is arranged to cause rotation of at least one cutting means carrier (18a, 18b).

6. The cutting head according to claim 5, wherein one electrically driven driving means (24a, 24b) is arranged to cause rotation of a plurality of cutting means carriers (18a, 18b).

7. The cutting head according to any of the preceding claims, wherein the cutting means (20a, 20b) comprises at least one flexible line member.

8. The cutting head according to any of claims 1 -7, wherein the cutting means (20a, 20b) comprises at least one cutter blade.

9. A hand-held battery powered tool, arranged for cutting/trimming vegetation, which hand held battery powered tool (100) comprises

a handle portion (8),

a cutting head (10) according to any of the previous claims, and an elongated tubular rod 2 for positioning the cutting head 10 at a convenient distance from the handle portion 8.

10. The hand held battery powered tool according to claim 10, wherein the cutting head (10) is rotatably connected to the elongated tubular rod (2).