Abstract:
The invention relates to a brush device for brushing, combing, grooming, massaging or detangling, in particular for the coat and skin care of domestic animals, comprising a cassette holder for receiving a brush cassette having a drivable brush belt. The cassette holder and the brush cassette are designed in such a way that the brush cassette can be inserted into, and removed again from, the cassette holder.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to a brush device for brushing, combing, grooming, massaging or detangling, in particular for the coat and skin care of domestic animals, and to a brush system having such a brush device with exchangeable brush cassettes. 
       BACKGROUND OF THE INVENTION 
       [0002]    Japanese patent application JP 20011 20098 A discloses a device for animal hair care. The device has a brush belt which revolves around two rollers and is equipped with care elements on the surface thereof. The brush belt is driven by means of a drive motor which is installed between the rollers. A suction device sucks off animal hair which adheres to the care elements of the belt. 
         [0003]    The problem addressed by the present invention is that of providing an improved brush device for brushing, combing, grooming, massaging or detangling, in particular for the coat and skin care of domestic animals. 
       SUMMARY OF THE INVENTION 
       [0004]    The present invention relates to a brush device including a cassette holder for receiving a brush cassette with a drivable brush belt. The cassette holder and the brush cassette are designed in such a way that the brush cassette can be inserted into, and removed again from, the cassette holder. As a result, a brush cassette can easily be exchanged with another brush cassette. For example, it is possible, as required, to insert brush cassettes having different brush belts that are optimized for the particular care treatments. Furthermore, it is possible to easily replace defective or worn brush belts. 
         [0005]    The cassette holder can be a housing made of metal or plastics, which is fully or partially open on one or more sides. As a result, a brush cassette can easily be inserted into, or removed from, the cassette holder. 
         [0006]    The brush belt is preferably made as a flat belt in the form of a continuous belt and can be produced from a flexible plastic material. The brush belt brushes in the longitudinal direction, similar to the natural brush movements when hair is brushed. The length of the brush belt is preferably designed so as to realize a sufficiently long longitudinal movement of hair to obtain the desired care success. For example, a belt length of about 30 cm is preferred for the care of long-haired dogs so as to achieve a longitudinal movement of the hair over a distance of about 10 cm. Depending on the case of application, the belt length can also be longer or shorter. 
         [0007]    When the brush belt is made of an elastic material, retensioning—which might otherwise be necessary—can be avoided. 
         [0008]    The brush belt is equipped with trimming material, e.g. bristles, teeth or pins or the like. The trimming material can be spring steel wire which has a round body and a U-shaped bend. The spring steel wire can have a horizontal bend in the horizontal lower central part of the U-shaped wire, and/or can be bent on the ends. The spring steel wire can also have rounded ends. Alternatively, the trimming material can also be plastics, natural fiber, other metals or combinations of said materials. 
         [0009]    The brush belt can be made with or without milled-in structures, such as holes, transverse grooves, grooves or the like, which facilitate the attachment of the trimming material. 
         [0010]    The brush belt is preferably made as a revolving brush belt (in the manner of a “conveyor belt”) and is driven via a drive axle supported in the brush cassette. The brush holder supports a drive pin for the mechanical coupling of this drive axle. The drive pin meshes with the drive axle when the brush cassette is inserted into the cassette holder. This serves to achieve a mechanical coupling of the brush cassette to the cassette holder via which the driving force can be transmitted from the drive pin to the drive axle. The drive pin can be made e.g. as an external hexagon. A person skilled in the art might also realize the coupling in an alternative way, e.g. by providing the drive axle of the brush cassette with a hexagonal pin which meshes with a drive device (transmission, motor shaft or the like). What matters here is that when a brush cassette is inserted into the cassette holder the drive axle of the brush cassette is coupled to a drive motor or transmission in a detachable manner, such that a driving force of a drive motor, optionally geared-down by means of the gearing-up effect of a transmission, is transmitted to the drive axle of the brush cassette. 
         [0011]    Furthermore, a drive motor can be attached to the cassette holder and drives the drive pin. This drive motor can be e.g. an electric motor or the like. The drive motor is preferably mounted on the cassette holder in such a way that it is fully or partially accommodated in the brush cassette when the brush cassette is inserted. Alternatively, the drive motor can also be attached to the outside of the cassette holder. The drive motor can be mounted directly or indirectly on the cassette holder. 
         [0012]    The brush cassette advantageously has an opening which is designed to insert the drive motor into the brush cassette when the brush cassette is inserted into the cassette holder. The drive motor can be fully or partially inserted into the brush cassette through this opening in the brush cassette, as a result of which this motor is fully or partially accommodated in the interior of the brush cassette when the brush cassette is inserted into the cassette holder. A space-saving design of the brush device is realized in this way. For example, the opening can be provided between two rollers via which the brush belt runs. The opening can be disposed e.g. approximately in the center of the brush cassette so as to achieve a balanced weight distribution of the brush device. 
         [0013]    The opening for receiving the drive motor can be designed in such a way that it allows an insertion of the drive motor into the brush cassette in a substantially form-fit fashion. A form-fit opening in the brush cassette is preferably made with some clearance to facilitate the insertion of the brush cassette into the cassette holder. Alternatively, the opening in the brush cassette can also have a different shape. For example, one side of the cassette holder might be fully or partially open, such that when the brush cassette is inserted into the cassette holder the drive motor is fully or partially inserted into the brush cassette through this open side. 
         [0014]    Alternatively, the drive motor can also be positioned on the outside of the cassette holder. In this case, it is not necessary to provide the brush cassette with an opening in order to receive the drive motor. 
         [0015]    The brush cassette preferably has two rollers which serve as revolving rollers and around which the brush belt runs. At least one of the rollers is mounted on the drive axle of the brush cassette as the driving roller, as a result of which the driving force of the drive motor is transmitted to this driving roller when the brush cassette is inserted. The driving roller can be designed so as to act as a friction clutch in the case of overload. 
         [0016]    Furthermore, a transmission can be mounted on the cassette holder and couples the drive motor with the drive pin. This transmission can be mounted on an outer side of the cassette holder. The drive motor can be attached directly to, or be firmly mounted in, the cassette holder. 
         [0017]    The cassette holder preferably has a recess which is designed to receive in form-fit fashion at least part of the brush cassette, as a result of which the brush cassette is held in a predetermined position when it is in the coupled state. 
         [0018]    The brush device can also have a locking mechanism which serves to lock the brush cassette in the inserted state. This locking mechanism can be e.g. a locking screw. 
         [0019]    The cassette holder can be open on one side, as a result of which the brush cassette can be inserted into, or removed again from, the cassette holder by a movement in the direction of the drive axle of the brush cassette. 
         [0020]    The described brush device can be driven electrically. The brush device can be supplied by means of an electric cable with electric power which drives an electric motor. 
         [0021]    A handle can be attached to the cassette holder, by means of which the brush device can be held and actuated. The cassette holder and handle might be made of several pieces or one piece. The cassette holder can preferably be operated via such a handle in one-handed fashion. Control elements, e.g. an on/off switch and/or a power regulator, can be provided on the handle and/or on the cassette holder. 
         [0022]    A suction channel can be provided on one end of the cassette holder and offers a connection option for an external suction device, e.g. a household vacuum cleaner. Soiling, hair or other particles in the brush region can thus be vacuumed off continuously during brushing. 
         [0023]    A brush system having a brush device as described above comprises a plurality of brush cassettes, all having different brush belts. The cassette holder of the brush device is designed to receive the plurality of brush cassettes in an exchangeable way. As a result, a brush cassette can easily be removed and be exchanged with another brush cassette. For example, it is possible by means of the brush system to insert, as required, brush cassettes having different brush belts, all optimized for special care treatments. 
         [0024]    The brush device according to the invention and/or the brush system according to the invention can be used for straightening the topcoat, combing out and detangling the undercoat, combing out and vacuuming off dead hair, in particular when the coat changes, combing out and vacuuming off dirt particles and dandruffs and aerating and massaging the coat and the skin. 
         [0025]    A brush belt according to an embodiment has a basic belt strip on which one or more comb elements are mounted in such a way that they are substantially perpendicular to the surface of the basic belt strip. A brush belt having one or more comb elements, is particularly suitable to thin out undercoat or remove died hair effectively and rapidly from the coat. The comb elements can consist of different materials and vary in shape, depending on the case of application (short-haired coat/long-haired coat). Four to six comb elements are preferably arranged on a brush belt. Furthermore, a plurality of bristle bundles can be provided on the brush belt strip and are attached to the basic belt strip between the comb elements. 
         [0026]    Further aspects and features of the present invention result from the dependent claims, the appended drawings and the below description of preferred embodiments. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         [0027]    Embodiments of the invention are now described by way of example and with reference to the appended drawings, wherein 
           [0028]      FIG. 1 a    shows a schematic diagram of an embodiment of the brush device according to the invention including a brush cassette and a cassette holder; 
           [0029]      FIG. 1 b    shows a schematic diagram of an embodiment of the brush device according to the invention in a view in which a brush cassette is removed from the cassette holder; 
           [0030]      FIG. 1 c    shows a schematic diagram of an embodiment of the brush device according to the invention in a front view; 
           [0031]      FIGS. 2 a  and 2 b    show a schematic diagram of a side view and a front view of an embodiment of a brush cassette, respectively; 
           [0032]      FIG. 3  shows schematically the insertion of a brush cassette into a cassette holder and the removal therefrom; 
           [0033]      FIGS. 4 a , 4 b  and 4 c    show a top view, a side view and a front view of an embodiment of the brush cassette, respectively; 
           [0034]      FIGS. 5 a , 5 b  and 5 c    show a side view, a front view and a top view of an embodiment for trimming material, respectively; 
           [0035]      FIGS. 6 a , 6 b  and 6 c    show a top view, a side view and a front view of a further embodiment of a brush cassette, respectively; 
           [0036]      FIG. 7  shows an exemplary brush belt in a state in which it is removed from the brush cassette; 
           [0037]      FIG. 8  shows an exemplary comb element; 
           [0038]      FIG. 9  shows a cam which is attached to a basic belt; 
           [0039]      FIGS. 10 a  and 10 b    show how to attach a comb element to a cam; and 
           [0040]      FIG. 11  shows a top view of a segment of an exemplary brush belt in  FIG. 7 . 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0041]      FIG. 1 a    shows by way of schematic diagram a side view of an embodiment of the brush device  1  according to the invention. A brush cassette  5 , which is inserted into a cassette holder  3  and substantially one side wall  5   a  of which is shown, has a brush belt  7 , which is made as a revolving flat belt. The rotary arrow in  FIG. 1  outlines the revolving movement of the brush belt  7  around a revolving roller ( 43  in  FIGS. 4 a  and 4 b   ) which is rotatably mounted in the brush cassette  5  via a revolving roller axle  9 . The brush belt  7  is equipped with fitting material  11  which is here made as bristles from spring steel wire. A transmission housing  13  is mounted on one side wall  3   a  of the cassette holder  3  and accommodates a transmission (not shown). The transmission couples a drive motor ( 31  in  FIG. 1 b   ) accommodated in the cassette holder  3  via a drive pin ( 33  in  FIG. 1 b   ) and a drive axle ( 35  in  FIGS. 4 a  and 4 b   ) to a driving roller ( 45  in  FIGS. 4 a  and 4 b   ). Furthermore, a handle  15  is attached to the cassette holder  3 . The brush device  1  can be held by means of this handle. A switch  17  is mounted on the handle  15 , said switch having three switch positions (forward-stop-reverse), by means of which the drive motor and thus the brush belt  7  can be changed into a forward operation, a stop operation and a reverse operation. The power of the drive motor  31  and thus the speed and/or the pulling force of the brush belt  7  can be regulated by means of a power regulator  19 . A suction opening  21  is disposed on the rear end of the brush device  1  and opens into a suction channel  23  to which a suction device, such as a household vacuum cleaner, can be connected. Furthermore, an electric cable  25  exits the rear end of the brush device  1  and serves to provide the brush device  1  with electric power for the operation of the drive motor. The electric cable extends through the interior of the brush device  1  to the drive motor  31  to supply the latter with electric power. 
         [0042]      FIG. 1 b    shows by way of schematic diagram the embodiment of the brush device  1  according to the invention in a view which shows the side of the brush device  1  that is opposite to that in the view of  FIG. 1   a.  In the view of  FIG. 1   b,  the brush cassette  5  is removed from the cassette holder  3  and is therefore not shown. The side wall  3   a  of the cassette holder  3  has a recess  27  for receiving part of the brush cassette  5 . The recess  27  has substantially the shape of a brush cassette  5  and has a depth of e.g. 3 mm, as a result of which a brush cassette  5  is partially buried in this recess  27  when the brush cassette  5  has been inserted and is thus held in the position provided by the recess  27 . A motor axle of a drive motor  31  mounted on the side wall  3   a  runs vertically through the side wall  3   a.  The rotation of the motor axle is transmitted to a drive pin  33  via a transmission  13  (see  FIGS. 1 a  and 1 c   ) mounted on the rear side of the side wall  3   a , said drive pin being made as an external hexagon. This drive pin  33  serves to couple the drive axle  35  of a brush cassette  5  when it is inserted into the cassette holder  3 . A locking pin  29  is attached to the housing of the drive motor  31  and is vertical to the side wall  3   a  of the cassette holder  3 . The cassette holder  3  is closed on the upper side and rear side by a rear wall  3   b,  which has a curved surface. The handle  15  including the switch  17 , the power regulator  19  and the electric cable  25  is mounted on this rear wall  3   b.  The rear end of the rear wall  3   b  has a suction opening  21  which opens into the suction channel  23 . 
         [0043]      FIG. 1  shows by way of schematic diagram the embodiment of the brush device  1  according to the invention in a front view. In this view, the brush cassette  5  is also removed and therefore not shown.  FIG. 1 c    shows the transmission housing  13  which is mounted on the outer side of the side wall  3   a  of the cassette holder  3  and accommodates a transmission. The transmission housing  13  and/or the transmission is mounted opposite to the drive motor  31 . The drive motor  31  is made as an electric motor. Only the motor housing is shown by way of diagram in the figures. A motor axle of the drive motor  31  extends into the transmission housing  13  and couples to the transmission disposed therein. 
         [0044]      FIGS. 2 a  and 2 b    show by way of schematic diagram a side view and a front view of an embodiment of a brush cassette  5 . The brush cassette  5  is shown in a state in which it was removed from the cassette holder  3 . The brush cassette  5  comprises a brush belt  7 , which is equipped with fitting material  11  that is here made as bristles from spring steel wire. The brush cassette  5  is confined on both longitudinal sides by a side wall  5   a  and  5   b , respectively. The side view of  FIG. 2 a    shows the side wall  5   a  of the brush cassette  5  which meshes with the recess  27  of the side wall  3   a  (see  FIG. 1 b   ) of the cassette holder  3  when the brush cassette  5  is inserted into the cassette holder  3 . A drive axle  35  is connected to a driving roller ( 45  in  FIGS. 4 a  and 4 b   ). The drive axle  35  is designed in such a way that, when the brush cassette  5  is inserted into the cassette holder  3 , the drive pin  33  meshes with the drive axle  35 .  FIG. 2 a    also shows a revolving roller axle  9  which is supported in the side walls  5   a  and  5   b  of the brush cassette  5  and which is connected to a revolving roller ( 43  in  FIGS. 4 a  and 4 b   ) and rotatably mounts the latter in the brush cassette  5 . A brush belt  7  equipped with fitting material  11  revolves around the driving roller and deflection roller. The side wall  5   a  of the brush cassette  5  also has a motor insertion opening  37 , through which the drive motor  31  is inserted into the brush cassette  5  when the brush cassette  5  is inserted into the cassette holder  3 . In the front view of  FIG. 2 b   , the insertion opening  37  is shown in dashed line. In the embodiment of the brush device  1  shown herein, the drive motor  31  has a cylindrical shape, such that the motor insertion opening  37  is made as a circular hole in the cassette wall  5   a.    
         [0045]    Furthermore, the front view of  FIG. 2 b    also shows a locking opening  39  in the side wall  5   b  of the brush cassette  5 . When the brush cassette  5  is inserted into the cassette holder  3 , the locking pin  29  is inserted into this locking opening  39  and is guided through the side wall  5   b.  The locking opening  39  fully penetrates the side wall  5   b.  In  FIG. 2 b   , the shown thickness of the side wall  5   b  also comprises a protrusion which merely exists in the outer edge region of the side wall. However, in the inner region, the side wall  5   b  has a thickness which corresponds to the locking opening  39 . The side wall  5   a  of the brush cassette  5  likewise has a protrusion in the outer edge region. 
         [0046]    Finally, a revolving direction of the brush belt  7  is outlined in  FIGS. 2 a  and 2 b    by an arrow. 
         [0047]      FIG. 3  shows by way of diagram the insertion of the brush cassette  5  into the cassette holder  3  and the removal therefrom. In order to insert the brush cassette  5  into the cassette holder  3 , the brush cassette  5  is inserted into the cassette holder  3  via an open side of the cassette holder  3  (in  FIG. 3  from the right), and therefore the drive motor  31  is inserted into the brush cassette  5  through the motor insertion opening  37  of the brush cassette  5 . When the brush cassette  5  has been fully inserted into the cassette holder  3 , part of the side wall  5   a  of the brush cassette is buried in form fit fashion in the recess  19  in the side wall  3   a  of the cassette holder  3 , said recess being provided for this purpose. The locking pin  29 , which is firmly connected to the housing of the drive motor  31 , is inserted into the locking opening  39  of the side wall  5   b  of the brush cassette  5  when the brush cassette  5  is inserted and is guided through the opening, as a result of which the locking pin  29  protrudes through the side wall  5   b  when the brush cassette  5  is in its inserted state. Having inserted the brush cassette  5  into the cassette holder  3 , the brush cassette  5  is locked by means of a locking screw  41  which is screwed onto the locking pin  29  protruding from the side wall  5   b.  For this purpose, the locking screw  41  has an internal thread which meshes with an external thread on the locking pin  29 . 
         [0048]      FIGS. 4 a , 4 b  and 4 c    show a top view, a side view and a front view of a first embodiment of the brush cassette  5 , respectively. The top view of  FIG. 4 a    and the side view of  FIG. 4 b    show in a dashed line schematically the revolving roller  43  disposed in the interior of the brush cassette  5  and the driving roller  45 . The two lateral edge portions of the revolving roller  43  and the driving roller  45  have a protrusion and thus a somewhat larger diameter compared to the central region, and therefore the brush belt  7 , which is shown in dashed line in  FIG. 4 b   , is safely transported. The fitting material  11  penetrates the brush belt  7 . The driving roller shows the driving roller axle  35  which has a depression in the form of hexagonal recess with which the drive pin  33  of the cassette holder  5  can mesh. The side view of  FIG. 4 b    shows in the center of the brush cassette  5  the motor insertion opening  37  in the side wall  5   a  and the cassette locking mechanism  39  disposed on the opposite side  5   b.  The brush cassette  5  of this embodiment has an exemplary length L of 15 cm, an exemplary width B of 7 cm and an exemplary height H of 5 cm. The outer edge regions of side walls  5   a  and  5   b  of the brush cassette  5  have a protrusion, as a result of which the revolving roller  43  and the driving roller  45  are shown in  FIG. 4 a    in a way partially covered by this protrusion. In the inner region, the thickness of the two side walls  5   a  and  5   b  corresponds to the depths of the openings  37  and  39 , respectively, as a result of which these openings  37  and  39  fully penetrate the side walls  5   a  and  5   b,  respectively. 
         [0049]      FIGS. 5 a , 5 b  and 5 c    show a side view, a front view and a top view of an embodiment for the fitting material  11 , respectively. The exemplary fitting material  11  is spring steel wire which has a length of about  4  cm and has a round body. The spring steel wire has a U-shaped bend as shown in the front view of  FIG. 5 b   . The spring steel wire has a horizontal bend in the horizontal, lower central part of the U-shaped wire, as shown in the top view of  FIG. 5 c   . In this embodiment, the bend has an exemplary angle of about 90°. As shown in the side view of  FIG. 5 a   , the ends of the spring steel wire are slightly bent rearwards. The bending angle is here e.g. 30° and the rearward bent parts of the spring steel wire each have a length of about 3 mm. In order to avoid scratching of the spring steel wire, the ends of the spring steel wire are rounded. The spring steel wire is inserted into a brush belt  7  from below, as a result of which the horizontal, lower central part of the U-shaped wire rests on the brush belt  7 . Therefore, the U-shaped spring steel wire inserted in such a way realizes two bristles for the coat care of domestic animals on the outer side of the brush belt  7 . 
         [0050]      FIGS. 6 a , 6 b  and 6 c    show a top view, a side view and a front view of a further embodiment of a brush cassette  5 , respectively. The brush cassette  5  of  FIGS. 6 a , 6 b  and 6 c    differs from the brush cassette  5  of  FIGS. 4 a , 4 b  and 4 c    merely in that an alternative embodiment of a brush belt  7  is used. The alternative brush belt  7  is an endless flat belt which is equipped with comb elements  51  which are mounted on the brush belt  7  in such a way that they are disposed substantially transversely to the running direction and are substantially perpendicular to the surface of the brush belt  7 . This brush belt  7  is particularly suited to thin out undercoat or remove dead hair effectively and rapidly from the coat. 
         [0051]    Five comb elements  51  are shown in the side view of  FIG. 6 b    and are arranged on the brush belt  7  at approximately equal distances. The brush belt  7  is equipped with bristle bundles  53  between the comb elements  51 , said bristle bundles being designed in such a way that they protrude from the brush belt approximately as much as the corresponding teeth  55  of the comb elements  51 . A bristle bundle  53  consists e.g. of a plurality of natural or plastic fibers, e.g. nylon. For the purpose of simplification,  FIGS. 6 a  and 6 c    only show one comb element  51  each. The bristle bundles  53  serve to render possible the most uniform contact pressure of the brush belt  7  on the coat, which makes the treatment more pleasant. In alternative embodiments, the bristle bundles  53  can also be omitted. 
         [0052]      FIG. 7  shows the brush belt  7  used in the brush cassette  5  of  FIGS. 6 a , 6 b  and 6 c    in a state in which it is removed from the brush cassette  5  (not shown in  FIG. 7 ). The brush belt  7  of  FIG. 7  is equipped with comb elements  51  and is used in an electric flat belt brush or cassette brush (see  FIGS. 6 a , 6 b , 6 c   ) which drives the belt. Hair, undercoat, soiling and other particles can be vacuumed off continuously in the brush region during brushing, as described above in connection with the brush device of  FIGS. 1 to 5 . 
         [0053]      FIG. 8  shows a front view of a comb element  51 . The comb element  51  has a plurality of teeth  55 . The comb element  51  can be made of plastics or metal. The intermediate spaces between the teeth preferably become narrower towards the end. The length of the teeth and/or slits and the width can vary depending on the field of application (long-haired coat, short-haired coat or coat type). The comb element  51  also has bores  61  which are provided e.g. with screws or pins (e.g. plastic pins or spring bars) like a screw or plug connection in order to attach the comb element  51  to a cam (see  59  in  FIGS. 10 a  and 10 b   ). 
         [0054]      FIG. 9  shows a cam  59  on a basic belt  57  (flat belt), to which a comb element  51  can be attached. The cam  59  has bores  62 , which serve to attach a comb element  51 . An upper half of the cam  59  has lateral cam recesses  65 , which run in the running direction of the strip. This leads in a lower half of the basic belt  57  to corresponding lateral cam protrusions  67  which mesh with the side walls of the brush cassette  5  (cf.  5   a  and  5   b  of  FIG. 4 a   ), and therefore the basic belt  57  and/or the brush belt  7  on the brush cassette  5  is held in position while revolving. The cam  59  can consist of a material, e.g. a plastic material, which is harder than the material of the basic belt on which it is mounted. Thus, the cam  59  offers a stable attachment possibility for the comb element  51  and the basic belt  57  offers sufficient flexibility for an easy run around the rollers. In one embodiment, a compact polyurethane plastics SNE of hardness 80 ShA is used as the material of the cam  59 , whereas a polyurethane plastics PU of hardness 60-70 ShA is used as a material of the basic belt  57 . 
         [0055]    The cross-sectional view of  FIG. 10 a    and the front view of  FIG. 10 b    show how to firmly connect a comb element  1  to a cam  59  by inserting a screw or a pin  63  into a bore ( 61 ,  62  in  FIGS. 8 and 9 ). Furthermore,  FIG. 10 a    shows two adjacent cams, each equipped with a bristle element  53 . 
         [0056]    Finally,  FIG. 11  shows a top view of a partial view of the brush belt  7 . A plurality of cams  59  are attached to a flat belt  57  and are equipped with respective bristle bundles  53 . The top view of  FIG. 11  does not show any comb elements  51  for reasons of simplification. 
       LIST OF REFERENCE SIGNS 
       [0000]    
       
           1  brush device 
           3  cassette holder 
           3   a  side wall of the cassette holder 
           3   b  rear wall of the cassette holder 
           5  brush cassette 
           5   a  side wall of the brush cassette 
           5   b  side wall of the brush cassette 
           7  brush belt 
           9  revolving roller axle 
           11  fitting material 
           13  transmission with transmission housing 
           15  handle 
           17  switch (forward-stop-reverse) 
           19  power regulator 
           21  suction opening 
           23  suction channel 
           25  electric cable 
           27  recess for positioning the brush cassette 
           29  locking pin 
           31  drive motor with drive motor housing 
           33  drive pin 
           35  drive axle 
           37  motor insertion opening of the brush cassette 
           39  locking opening 
           41  locking screw 
           43  revolving roller 
           45  driving roller 
           51  comb element 
           53  bristle bundle 
           55  teeth of the comb element 
           57  basic belt 
           59  cam 
           61  bores in the comb element 
           62  bores in the cam 
           63  screw or pin 
           65  cam recess 
           67  cam protrusion