CUTTING UNIT FOR A BRUSHCUTTER

Abstract

Cutting unit for a brush cutter (9), wherein the cutting unit (1) has a tool (2) driven in rotation by a motor of the brush cutter (9), comprising the tool (2), a base part (3) and a head part (5, 6), wherein the base part (3) is firmly connectable to an output of the brush cutter (9) and the tool (2) is held by the base part (3) and detachably connectable to the drive of the brush cutter (9), and wherein the base part (3) has a receptacle (32) for detachably holding the head part (5, 6), characterized by that the cutting unit (1) comprises a single base part (3) and at least two different head parts (5, 6) connectable to this base part (3), wherein the first head part (5) is designed to hold a cutting tool (22) and / or to guide a trimming line, and the second head part (6) is designed to form a brush, and that the cutting unit (1) enables the brush cutter (9) to be converted by attaching either a trimming tool (21) for trimming the grass, a cutting tool (22) for shortening branches, or a brushing tool (23) for brushing stones or slabs to the base part (3) as a tool (2), and that the head part (5, 6) is removable from the base part (3) in order to exchange the tool (21, 22, 23) held on the base part (3) for a similar tool (21; 22; 23) or to convert it to a different type of tool (22; 23; 21), and that the receptacle (32) of the base part (3) is designed as a bayonet lock or as a thread (31).

Description

The invention relates to a cutting unit for a motor snow according to the features of the preamble of claim 1.Such cutting units for motor genes or motor genes are well known to the person skilled in the art from practice. Motor blades are used to mow grass or lawns, for example, particularly in the area of lawn edges or under mountains. Such motors usually have trimming threads which are driven by a drive of the motor snow in rapid rotation and protrude radially due to centrifugal force and act as a cutting tool. Such trimming threads are excellently suitable for grass or lawn surfaces. However, as soon as it is concerned to mow meadow areas in which herbaceous growths or branches are present, it is necessary to use a so-called brush cutter. A brush cutter has as a cutting tool a rotationally driven cutting blade which, without counter-cutting, is capable, due to its rapid rotational movement, of cutting off even herbaceous crops or thinner branches. With such a brush cutter, meadows or smaller dentures can also be cut.A convertible motor antenna is known from US 2015 / 0245558 A1, for example.US 2002 / 0029483 A1 discloses, for example, a rotary cutting device with convertible tools.From JP H11-56065 A, for example, a mower of a hand lawn mower with trimming threads and cutting blades is known.A brush attachment for a hand tool with a driven rotating shaft is known from DE 10 2017 121 398 A1, for example.For example, DE 100 41 127 A1 discloses a thread cutter with a plurality of trimming threads.For example, US 2013 / 0205596 A1 discloses a multifunctional rotary cutting head for cutting devices.For example, US 2018 / 0368315 A1 discloses a motor antenna with a trimming head which can be fitted with a plurality of tools.The object of the present invention is to create a cutting unit for a motor snow or a motor snow which, with little structural complexity, enables a simple re-adjustment of the cutting tool.This object is achieved according to the invention by a cutting unit for a motor snow according to the features of claim 1.According to the invention, a cutting unit for a motor snow is provided, wherein the cutting unit has a tool which is driven in rotation by a motor of the motor snow, comprising a tool, a base part and a head part, wherein the base part is fixedly connectable to an output of the motor snow and the tool is held by the base part and is detachably connectable to the drive of the motor snow, and wherein the base part has a receptacle for detachably holding the head part. It is essential that the cutting unit enables the motor snow to be re-fitted by either a trimming tool for lawn trimming or a cutting tool for branch trimming or a brushing tool for brushing stones or plates being attachable to the base part as a tool, and that the head part is removable from the base part in order to replace the tool held on the base part with a similar tool or re-fit it with a different tool.An advantage of this embodiment is that the cutting unit comprises only relatively few parts, and therefore only a few parts are necessary for the conversion, that is to say an operator has to carry only a few parts.A further advantage is that the conversion can be effected with few manipulations, namely solely by removing the head part and inserting a new tool. That is, the conversion can take place directly in the field in a short time. This eliminates the need for a complex modification of the entrained motor snow or even the need for an exchange of the motor snow with respect to a brush cutter.It is also advantageous that the motor snow can be used not only for cutting or mowing but also for cleaning, in that the cutting unit is capable of also performing cleaning work with the brush by conversion to a brush tool.In particular, the cutting unit can be provided as a trim head for a motor snow, wherein the motor snow can be driven electrically or by means of fuel. An electric motor with mains operation or battery operation can be used, for example, as the drive of the motor series. Alternatively, an internal combustion engine can also be used as a drive for the engineense.Preferably, the motor of the motor winch has a rotating output which is set in rotation by the motor via a transmission. The base part of the cutting unit can be connected to the output drive in a rotationally fixed manner, so that it is driven in rotation by the motor of the motor snow.In particular, it is provided that the base part is designed as a receptacle or bearing for a tool and transmits the rotational movement to the tool in that the tool is held on the base part in a rotationally fixed manner. Via the head part which can be removed from the base part, the tool is held on the base part.It is preferably provided that the tool is changed over by removing the head part, wherein the removal of the head part is made possible in particular by a rotational movement of the head part. According to the invention, the receptacle of the base part is designed as a bayonet lock or as a thread.In one embodiment, it can be provided that the head part has a connecting piece which engages in a cylindrical receptacle of the base part, or that the base part has a connecting piece which engages in a cylindrical receptacle of the head part, and that the head part can be fixed and / or detached on the base part by a rotational movement relative to the latter.The rotationally fixed connection between the base part and the head part can provide, in particular, for the base part and / or the head part to be driven in rotation about a common axis of rotation.In a structural embodiment, it is preferably provided that the base part and / or the head part is configured rotationally symmetrically with respect to the axis of rotation, in particular that the base part and / or the head part each have a round outer contour.The following procedure can be adopted for forming or equipping the cutting unit with a trimming tool:It can be provided in particular that the base part has a receiving space for receiving one trimming thread or a plurality of trimming threads for lawn trimming.For example, it can be provided that when the head part is removed from the base part, a trimming thread or a thread cassette can be inserted into the base part, or that when the head part is removed from the base part, a plurality of trimming threads can be inserted into the base part.In this case, it can be provided that, when the head part is fixedly attached to the base part, a gap is formed between the base part and the head part, and a trimming thread or a plurality of the trimming threads protrude, in particular radially protrude, from the gap in order to form a trimming tool.The following procedure can be adopted for forming or equipping the cutting unit with a cutting tool:It can be provided that a cutting blade is held between the base part and the head part, in particular a two-wing or three-wing cutting blade is held.The fixing of the cutting blade can preferably be effected in that the base part has a driver device which fixes the cutting blade to the base part in a rotationally fixed manner by positive locking.For example, it can be provided that the driver device has at least one projection or pin formed on the base part, which engages in a positive-locking manner in at least one recess of the cutting blade, and / or that the driver device has at least one projection or pin formed on the cutting blade, which engages in a positive-locking manner in at least one recess of the base part.In a preferred embodiment, it can be provided that a plurality of projections or pins arranged radially circumferentially around the base part and / or head part are each arranged at a distance from one another in such a way that an intermediate space is formed between in each case two projections and / or pins, and that a trimming thread is guided in such an intermediate space.Preferably, it can be provided that the base part and the head part have mutually facing clamping surfaces, wherein the cutting blade is held between these clamping surfaces when the head part is mounted on the base part.A particularly simple conversion of the cutting unit between the trimming tool and / or the cutting tool and / or the brush tool can be made possible by providing, in a preferred embodiment, that the cutting device has a first head part for holding a cutting blade or for guiding trimming threads and a second head part for forming a brush.In this case, in particular the head part for forming a brush on the base part can be fixable interchangeably with the head part for holding a cutting blade.In one embodiment of the brush tool, it can be provided that the head part has a plurality of axially aligned bristles for forming a brush.Alternatively, it can also be provided that the head part for forming a brush has a multiplicity of axially aligned passage openings for guiding trimming threads in order to form a brush.According to the invention, the cutting unit comprises a single base part and at least two different head parts connectable to this base part, wherein the first head part is configured for holding a cutting tool and / or for guiding a trimming thread, and the second head part is configured for forming a brush.The invention is directed to a cutting unit for a motor snow, by means of which an existing motor snow can be equipped in order to ensure simple refitting of the motor snow and to expand its field of application in the process.Alternatively, the invention relates to a motor snow with a corresponding cutting unit according to the invention in order to provide a user with a motor snow which is easily convertible and which offers a universal field of application.Exemplary embodiments of the invention are illustrated in the figures and explained in the following description of the figures. The following are shown: FIG. 1 : a schematic view of a motor snow with a cutting tool; FIG. 2 : a schematic view of the motor snow with a brush tool; FIGS. 3 a, 3 b : views of the base part of the cutting unit; FIGS. 4 a, 4 b : views of a head part of the cutting unit; FIGS. 5 a, 5 b : views of a second head part of the cutting unit; FIG. 6 is a plan view of a cutting blade; FIG. 7 is a view of a cutting tool of the cutting unit; FIG. 8 is a view of a trimming tool of the cutting unit; FIG. 9 : a view of a brush tool of the cutting unit.The figures show, by way of example, a possible configuration of the invention. This embodiment serves to explain a possible implementation of the invention and should not be understood as limiting.FIG. 1 shows a schematic illustration, not according to the invention, of a motor snow 9 having a cutting unit 1. the motor snow 9 has a handle 91, on which a shield 12 and the cutting unit 1 are held. The shield 12 serves to protect the operator and outside persons from injury and flying parts. On the handle 91 of the motorense 9 there is arranged a motor, not shown, for driving the cutting unit 1 or the trimming unit. Furthermore, a grip for guiding the motor snow, which is not shown in the drawing, is arranged on the handle 91 of the motor snow 9.In the embodiment not according to the invention shown in FIG. 1, the cutting unit 1 is provided as a trimming head 11. The engine snow 9 is preferably driven electrically or by means of fuel. An electric motor with mains operation or battery operation can be used, for example, as the drive of the motor series 9. Alternatively, an internal combustion engine can also be used as a drive for the motorense 9. The motor of the motor nose 9 drives a rotating tool 2 which is mounted rotatably about the axis of rotation R. The tool 2 shown in FIG. 1 is designed as a cutting tool 22, which comprises a base part 3, a cutting blade 4 and a first head part 5. The cutting blade 4 is designed as a three-blade rotating cutting blade 4 and comprises three cutting blades 431, 432, 433. Each cutting blade has a blade 41 for cutting branches.The motor snow 9 not according to the invention shown in FIG. 2 is identical to the motor snow shown in FIG. 1, with the difference that the cutting unit 1 is equipped with the brush tool 23. The brush tool 23 has a base part 3 and a second head part 6, which is designed in such a way that it forms a brush by means of trimming threads.It is provided in particular that the cutting unit 1 of the motor winch 9 can be changed over. For this purpose, either the cutting tool 22 shown in FIG. 1 is short to the branch, or the brush tool 23 shown in FIG. 2 for brushing stones or plates, or a trimming tool 21, not shown, for trimming lawns, can be fastened to the base part 3 as the tool 2. For the conversion, it is provided in particular that the head part 5 or the head part 6 can be removed from the base part 3 in order to exchange the tool 21, 22, 23 held on the base part 3 with a similar tool 21, 22, 23 or convert a different tool 22, 23, 21.The base part 3 of the tool 2 is shown in FIGS. 3 aand 3 b. The base part 3 has a receptacle 32, which is designed as a thread 31 in this exemplary embodiment. Alternatively, the receptacle 32 can also be designed as a bayonet lock. The advantage of these embodiments is that the head part 5 and / or the head part 6 can be fixed to the base part 3 simply by turning it relative to it or can be removed from it. Furthermore, the base part 3 comprises a receiving space 36 for a trimming thread. In particular when using the trimming tool 21, the receiving space 36 for the thread is provided to receive an in particular loose trimming thread or a plurality of in particular loose trimming threads and / or a thread cassette which are used for lawn trimming.Furthermore, the base part 3 has a driver device 34, which preferably has a plurality of projections 341, 342, 343, 344 or pins, which are arranged circumferentially in such a way that intermediate spaces 351, 352 are formed between them. If the cutting tool 22 is provided as the tool 2, the projections 341, 342, 343, 344 or pins serve for the form-fitting mounting of the cutting blade 4. these fix the cutting blade 4 to the base part 3 in a rotationally fixed manner. As a result, the cutting blade 4 can rotate together with the base part 3 about the axis of rotation R.If the tool 2 is provided as a trimming tool 21, the intermediate spaces 351, 352 located between the projections 341, 342, 343, 344 or pins serve as guides for trimming threads.The base part 3 shown in FIG. 3 afurther comprises a clamping surface 33, which cooperates with the clamping surface 53 of the first head part 5 shown in FIG. 4 bfor holding the cutting blade 4. The cutting blade 4 is inserted between the clamping surfaces 33, 53 and clamped by fixing the head part 5 to the base part 3.FIGS. 4 aand 4 b show the first head part 5. The first head part 5 is used in particular if the tool 2 is provided as a trimming tool 21 or as a cutting tool 22. The first head part 5 has a connecting piece 52, on which a thread 51 is formed. Alternatively, a bayonet lock can also be provided on the connecting piece 52. The first head part 5 can be connected to the base part 3 by means of the connecting piece 52. The connecting piece 52 engages in the cylindrical receptacle 32 of the base part 3 and the first head part 5 can be fixed and / or detached on the base part 3 by means of the thread 31, 51 by a rotational movement relative to the latter. This ensures a quick and above all simple replacement of the tools 2 by the head part 5, 6 being released by means of a commercially available tool or preferably by hand, and thus being removable from the base part 3.FIGS. 5 aand 5 b show the second head part 6, which is used in particular when the tool 2 is provided as a brush tool 23. The second head part 6 then forms a brush and can be fixed interchangeably with the base part 3. For this purpose, the second head part 6 has a connecting piece 62, which has a thread 61. Alternatively, the connecting piece 62 can also have a bayonet lock. The connecting piece 62 engages in the cylindrical receptacle 32 of the base part 3 and can be fixed and / or detached on the base part 3 by means of the interacting threads 31 and 61 by a rotational movement relative to the latter.Furthermore, the second head part 6 has a plurality of axially aligned passage openings 631, 632, 633, 634 for guiding trimming threads. It is provided that the trimming threads protrude from the passage openings 631, 632, 633, 634 and thus form a brush.In FIG. 6, a cutting blade 4 is shown, which has three cutting wings 431, 432, 433. In an alternative embodiment variant, the cutting blade 4 can also be designed to be two-winged. Each of the cutting wings 431, 432, 433 has a cutting edge 41. As already described above, the cutting blade 4 has recesses 421, 422, 423, 424, which connect the cutting blade 4 to the base part 3 in a positive-locking manner. Because the base part 3 is connected in a rotationally fixed manner to an output of the motor, the cutting blade 4 can be rotatably driven. Due to the robust configuration of the cutting blade 4, preferably by steel or hardened steel, bushed growths and / or branches can be cut with the cutting blade 4.FIG. 7 does not show a cutting tool 22 as a tool 2 of the cutting unit 1 comprising the base part 3, the cutting blade 4 and the first head part 5.FIG. 8 does not show the trimming tool 21 as tool 2 of the cutting unit 1. The trimmer 21 includes the base part 3 and the first head part 5. This results in a gap 13 between the base part 3 and the first head part 5, through which a trimming thread or a plurality of trimming threads protrude. Preferably, the trimming thread is guided between two projections 341, 342, 343, 344 or pins, as shown in FIG. 3 a. The base part 3 of the trimming tool 21 is connected in a rotationally fixed manner to an output, preferably an output of the motor, as a result of which the trimming tool 21 is driven. Due to a high output speed, the protruding trimming thread or the protruding trimming threads are aligned radially due to the centrifugal force acting and act as a cutting edge. It is thus possible in particular to trim grass or lawn surfaces.FIG. 9, which is not according to the invention, shows the brush tool 23 as tool 2 of the cutting unit 1. the brush tool 23 comprises the base part 3 and the second head part 6, which is connected to the base part 3 in a rotationally fixed manner. The second head part has a plurality of passage openings 631, 632, 633, 634 for guiding trimming threads. The trimming threads advantageously protrude from the passage openings 631, 632, 633, 634 and thus form a brush. The base part 3 of the brush tool 23 is connected in a rotationally fixed manner to an output, preferably an output of the motor, as a result of which the brush tool 23 is driven. Due to a high output rotational speed, it is possible to easily remove stubborn soiling from surfaces. In particular for stones, pavements or slabs, the brush tool 23 is ideally suited for cleaning. In particular, the rotational speed of the motor can be adjustable in order to adapt the rotational speed of the tool to the respective intended use.List of reference characters1 Cutting unit 11 Trimming head 12 Shield 13 Gap 2 Tool 21 Trimming tool 22 Cutting tool 23 Brush tool 3 Base part 31 Thread 32 Receptacle 33 Clamping surface 34 Driver device 341 Projection 342 Projection 343 Projection 344 Projection 351 Intermediate space 352 Intermediate space 36 Receiving space for thread 4 Cutting blade 41 Blade 421 Recess 422 Recess 423 Recess 424 Recess 431 Cutting wing 432 Cutting wing 433 Cutting wing 5 First head part 51 Thread 52 Connecting piece 53 Clamping surface 6 Second head part 61 Thread 62 Connecting piece 631 Passage opening 632 Passage opening 633 Passage opening 634 Passage opening 9 Motor nose 91 Handle R Axis of rotation

Claims

Cutting unit for a motor snow (9), wherein the cutting unit (1) has a tool (2) driven in rotation by a motor of the motor snow (9), comprising the tool (2), a base part (3) and a head part (5, 6), wherein the base part (3) is firmly connectable to an output of the motor snow (9) and the tool (2) is held by the base part (3) and detachably connectable to the drive of the motor snow (9), and wherein the base part (3) has a receptacle (32) for detachably holding the head part (5, 6), characterized in that the cutting unit (1) comprises a single base part (3) and at least two different head parts (5, 6) connectable to this base part (3), wherein the first head part (5) is designed for holding a cutting tool (22) and / or for guiding a trimming thread, and the second head part (6) is designed for forming a brush, and in that the cutting unit (1) enables the motor nose (9) to be refitting by either a trimming tool (21) for lawn trimming or a cutting tool (22) for branch trimming or a brush tool (23) for brushing stones or plates being able to be fastened to the base part (3) as a tool (2), and in that the head part (5, 6) is removable from the base part (3) in order to exchange the tool (21, 22, 23) held on the base part (3) for a similar tool (21; 22; 23) or to refitting it for a different tool (22; 23; 21), and in that the receptacle (32) of the base part (3) is designed as a bayonet lock or as a thread (31).Cutting unit for a motor snow according to claim 1, characterised in that the head part (5, 6) has a connecting piece (52, 62) which engages in a cylindrical receptacle (32) of the base part (3), or in that the base part (3) has a connecting piece which engages in a cylindrical receptacle of the head part (5, 6), and in that the head part (5, 6) can be fixed and / or detached on the base part (3) by a rotational movement relative to the latter.Cutting unit for a motor snow according to claim 1 or 2, characterised in that the base part (3) and the head part (5, 6) are driven to rotate about a common axis of rotation (R).Cutting unit for a motor snow according to claim 3, characterised in that the base part (3) and / or the head part (5, 6) is designed to be rotationally symmetrical with respect to the axis of rotation (R), in particular in that the base part (3) and / or the head part (5, 6) each have a round outer contour.Cutting unit for a motor snow according to one of the preceding claims, characterized in that the base part (3) has a receiving space (36) for receiving one trimming thread or a plurality of trimming threads for lawn trimming.Cutting unit for a motor snow according to one of the preceding claims, characterized in that, when the head part (5) is removed from the base part (3), a trimming thread or a thread cassette can be inserted into the base part (3), or in that, when the head part (5) is removed from the base part (3), a plurality of trimming threads can be inserted into the base part (3).Cutting unit for a motor snow according to one of claims 5 or 6, characterised in that when the head part (5) is fixedly attached to the base part (3), a gap (13) is formed between the base part (3) and the head part (5) and one or more of the trimming threads protrude from the gap (13), in particular radially protrude, in order to form a trimming tool (21).Cutting unit for a motor snow according to one of the preceding claims, characterized in that a cutting blade (4) is held between the base part (3) and the head part (5), in particular a two-wing or three-wing cutting blade (4) is held.Cutting unit for a motor snow according to claim 8, characterised in that the base part (3) has a driver device (34) which fixes the cutting blade (4) to the base part (3) in a rotationally fixed manner by positive locking.Cutting unit for a motor snow according to claim 9, characterised in that the driver device (34) has at least one projection (341, 342, 343, 344) or pin which is integrally formed on the base part (3) and engages in a positive-locking manner in at least one recess (421, 422, 423, 424) of the cutting blade (4), and / or in that the driver device (34) has at least one projection or pin which is integrally formed on the cutting blade (4) and engages in a positive-locking manner in at least one recess of the base part (3).Cutting unit for a motory-zeese according to claim 10, characterised in that a plurality of projections (341, 342, 343, 344) or pins arranged radially circumferentially around the base part (3) and / or head part (5, 6) are each arranged at a distance from one another in such a way that an intermediate space (351, 352) is formed between in each case two projections and / or pins, and in that a trimming thread is guided in such an intermediate space (351, 352).Cutting unit for a motor snow according to one of Claims 8 to 11, characterized in that the base part (3) and the head part (5) have mutually facing clamping surfaces (33, 53), wherein the cutting blade (4) is held between these clamping surfaces (33, 53) when the head part (5) is mounted on the base part (3).Cutting unit for a motor brush according to one of the preceding claims, characterized in that the head part (6) for forming a brush on the base part (3) can be fixed in an exchangeable manner with the head part (5) for holding a cutting blade (4).Cutting unit for a motor snow according to one of the preceding claims, characterized in that the head part (6) for forming a brush has a multiplicity of axially aligned bristles.A cutting unit for a motor snow according to any one of the preceding claims, characterized in that the head part (6) for forming a brush has a plurality of axially aligned through openings (631, 632, 633, 634) for guiding trimming threads to form a brush.A motor winch (9) having a cutting unit (1) according to any one of the preceding claims.

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