EP2712705B1 - Portable sanding device for sanding a wall - Google Patents

Portable sanding device for sanding a wall Download PDF

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Publication number
EP2712705B1
EP2712705B1 EP13186470.4A EP13186470A EP2712705B1 EP 2712705 B1 EP2712705 B1 EP 2712705B1 EP 13186470 A EP13186470 A EP 13186470A EP 2712705 B1 EP2712705 B1 EP 2712705B1
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EP
European Patent Office
Prior art keywords
tool
shaft
central shaft
housing shell
tool plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13186470.4A
Other languages
German (de)
French (fr)
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EP2712705A3 (en
EP2712705A2 (en
Inventor
Bernaert Ruben
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Illinois Tool Works Inc
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Illinois Tool Works Inc
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Filing date
Publication date
Application filed by Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Publication of EP2712705A2 publication Critical patent/EP2712705A2/en
Publication of EP2712705A3 publication Critical patent/EP2712705A3/en
Application granted granted Critical
Publication of EP2712705B1 publication Critical patent/EP2712705B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/18—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like
    • B24B7/182—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like for walls and ceilings
    • B24B7/184—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like for walls and ceilings pole sanders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools

Definitions

  • the invention relates to a portable grinder for grinding a wall and a grinding head for a portable grinder for grinding a wall having the features of the preamble of claim 1.
  • portable grinders serve perpendicular to the floor surfaces, in particular walls on external facades or even inside buildings, grind or polish.
  • Such a device is from the CH-A5-652,065 known, wherein instead of the grinding head, a brush head is used. This can serve on the one hand to smooth a rough surface. On the other hand, it may also be necessary to clean a wall contaminated by radioactive material, for example, by grinding such material.
  • the abrasive action is thereby regularly achieved by a rotating, disk-like tool having a surface of or similar to sandpaper or with any other suitable structure and is attached to a grinding head.
  • the grinding head is then - either directly or by means of a longer grip portion of the grinder - held against the wall surface to be ground.
  • the problem with such a grinding device is that with a single rotating tool such as a disc, a uniform grinding action can not be readily achieved.
  • a stronger abrasive action regularly occurs at the outer parts of the disk which rotate at a higher speed than at the inner regions.
  • no grinding action occurs at all in the center of the rotating tool, since strictly speaking there is no rotation here.
  • the wear of the tool is correspondingly uneven as the grinding effect.
  • this non-uniform behavior can be compensated by appropriately compensating movements of the grinder by the operator.
  • this is cumbersome and requires a certain skill and experience on the part of the user. Consequently, the problem underlying the invention is to provide a sander which is both substantially uniform Grinding action on the surface is guaranteed as well as portable and can be guided and operated so that it is suitable for grinding a wall.
  • the problem is solved by the entirety of the features of claim 2, wherein this has a grinding head according to claim 1.
  • the problem of the invention is solved by the use of a grinder with a grinding head for grinding a wall. It is essential to realize that a particularly uniform grinding effect is achieved by the attachment of several rotating grinding tools on the grinder. So that the resulting increase in weight at the grinding head does not mean that the grinding head can no longer be conveniently guided on an extension arm-which enables the uniform and effective grinding of large-area wall surfaces-the relatively heavy motor required for the rotation of the grinding tools becomes housed in the main housing and thus close to a handle of the grinder.
  • the embodiments according to the invention relate to features which particularly facilitate the operation of the grinding device. So that large surfaces can be ground uniformly and over a longer period of time, it is necessary that the grinding head attached to a pipe arm can be guided precisely and with as little force as possible. For this, the weight distribution in the grinder and the grip options are of interest.
  • a light and thus controlled pressure is exerted on the wall during grinding.
  • This is easier if the grinding head is not simply attached to the end of a perfectly straight tube arm, but this has a type of hockey stick a lateral offset.
  • a reduction in unevenness in grinding can be achieved by using a plurality of juxtaposed abrasive tools in the grinding head of the sander. Just by reducing the radius of each grinding tool, this results in lower irregularities in the grinding behavior. However, areas remain in such a solution in which basically no abrasive effect occurs.
  • these include, in particular, the areas between the individual, regularly disk-like grinding tools.
  • a further improvement can be achieved if the grinding head not only has a plurality of individual, respectively disc-shaped and rotating grinding tools, but these are also arranged on a tool plate, which also rotates. Due to the resulting superimposed rotational movement, a largely uniform grinding action is achieved over the entire surface of the grinding head. According to precisely this preferred embodiment, therefore, a rotational movement must be generated both on the individual grinding tools and on the tool plate itself. All of these parts of the grinding head can be moved directly or indirectly through a drive or central shaft, which in turn is driven by a motor. A structure for the angular momentum transfer from such a central shaft to the plurality of grinding tools and to the tool plate is more complex than in the case of a single rotating grinding tool and requires additional components.
  • a preferred embodiment provides for weight savings, that the angular momentum is transmitted from the central shaft to the respective tool shaft only some grinding tools. Specifically, the rotation of the tool plate and the rest Grinding tools achieved in that by a Abicalzkranz, which is in engagement with the tool shafts of all grinding tools, a rotational movement of the tool shafts of the grinding tools can be mutually converted into a rotational movement of the turntable.
  • the inventive design of the grinder according to claim 2 provides an elegant way to compensate for an imbalance of the grinding head, which could result from the fact that the transmission of the angular momentum takes place on only a few or only a single tool shaft. This ensures a quieter rotational behavior of the tool plate.
  • the tool plate is equipped with a, preferably self-adjusting, balancing mass, which is adapted to offset a shift of the center of mass of the grinding head by the power transmission device so that the center of mass of the grinding head is located on an axis of the central shaft.
  • the particularly preferred embodiments according to claims 5 and 6 realize a particularly suitable mechanism for transmitting the angular momentum from the central shaft to the tool shaft of a grinding tool in the form of a belt drive.
  • Such a belt transmission on the one hand is able to transmit large forces in a comparatively simple and cost-effective design.
  • the belt can be replaced if necessary with relatively little effort.
  • the grinding head comprises a single closed cavity - namely the grinding head interior - which is enclosed by the tool plate on the one hand and the housing shell on the other hand.
  • this cavity all the essential components of the grinding head are arranged.
  • weight is saved by dispensing with intermediate dividing walls, and on the other hand minimizing the areas to be sealed.
  • all movable components can be easily detached from the rest of the grinding head for maintenance together with the tool plate.
  • Preferred embodiments of claim 7 in turn relate to a particularly preferred sealing arrangement in the form of a sealing ring between the tool plate and housing shell.
  • a sealing arrangement is on the one hand, the operation of the grinding head little hindering, easy to maintain, arranged compact and on the other hand ensures effective sealing of the grinding head interior before occurring during grinding in large quantities of contamination.
  • a suction device is provided according to a further preferred embodiment, which can carry away the abraded material, which regularly in an environment of Grinding head takes place. This suction can also lead to a negative pressure within the grinding head.
  • the housing shell has an air inlet opening with a filter element. Controlled air in this controlled way can enter polluted air and thus dissipate the negative pressure.
  • the preferred embodiments according to claim 11 in turn provide an arrangement of the Abdicalzkranzes on an inner edge of the housing shell and a training as a sun gear with correspondingly engaged corresponding wheels on the shafts of the grinding tools. This represents a particularly robust formation of a Abdozenslzkranzes.
  • the grinder 1 shown in the drawing is portable and can be used in particular for grinding or polishing a wall. It has a main housing 2 for receiving a motor 3, wherein the motor 3 is preferably an electric motor. Connected to the main housing 2 is a pipe arm 4. This pipe arm 4 is an elongate, rod-like device, which does not necessarily have to consist of a pipe in the strict sense. Furthermore, the grinding device 1 comprises a grinding head 5.
  • the grinding head 5 can, as shown here, be arranged directly or indirectly on the end remote from the main housing 2 of the pipe arm 4, thus allowing the processing of larger and higher wall surfaces.
  • a head joint 6 can be arranged between the grinding head 5 and the pipe arm 4.
  • the grinding head 5 comprises a group of tool shafts 7, which are rotatably mounted about a respective imaginary tool axis 8 and each have a tool fastening 9.
  • a group of tool shafts 7 consists of at least two tool shafts 7.
  • the tool fixtures 9 may be pins 9a, on which corresponding grinding tools 10 can be pushed. Alternatively, they may also be openings into which grinding tools can be inserted. Such a grinding tool 10 can, as shown, from a mounted on a support 11 foam disc 12 act on the underside turn sandpaper is attached or otherwise such a surface structure is formed. After attachment of the grinding tool 10 to the tool attachment 9, the grinding tool 10 rotates with the respective tool shaft 7.
  • the respective tool axes 8 are an axis of the respective tool shaft 7.
  • the main housing 2 has a main handle 13 and the pipe arm 4 has a secondary handle 14. Since the engine 3 regularly forms the heaviest single component of the grinder 1, the operator of the grinder 1 can keep this with the main handle 13 close to the body and thus with little effort.
  • the secondary handle 14 may in particular be a bow handle.
  • a head joint 6 is connected between the grinding head 5 and the pipe arm 4 via a holder 15 with the pipe arm 4.
  • This holder 15 is preferably angled or curved. Such a construction facilitates the operator's dosage of the pressing force of the grinding head 5 while reducing the risk that the grinding head 5 slips along a wall surface to be processed.
  • the holder 15 may, as in the present case, be a pair of bent plastic arms, which are connected on the one hand to the pipe arm 4 and on the other hand to the grinding head 5.
  • the grinding device 1 has a flexible drive shaft 16 driven by the motor 3, which is connected to the grinding head 5.
  • the flexible drive shaft 16 does not necessarily extend over the entire distance from the motor 3 to the grinding head 5.
  • a rigid drive shaft extend inside the pipe arm 4, the rotational movement is then transmitted to the flexible drive shaft 16 at the end of the pipe arm 4 ,
  • the grinding head 5 is advantageously set up for fastening a suction device 17 for removing abraded material.
  • this suction device 17 may in particular - As shown here - act around a ring-like attachment to the grinding head 5.
  • a suction hose 18 extends into the pipe arm 4, about to collect the extracted material then in a container provided for this purpose.
  • the power required for the suction can also be supplied by the motor 3.
  • the grinding head 5 preferably comprises a central shaft 19 and a tool plate 20 mounted rotatably about the central shaft 19 the tool shafts 7 stationary on the tool plate 20 and arranged eccentrically to the central shaft 19.
  • the stationary arrangement of the tool shafts 7 on the tool plate 20 means that the tool shafts 7 execute a corresponding translational movement with the tool plate 20 during a rotational movement of the tool plate 20.
  • tool axes 8 are aligned parallel to each other. Such an orientation can be - as in the present case - in particular also parallel to the central shaft 19.
  • the grinding head 5 has a gear construction 21 for converting a rotational movement of the center shaft 19 into a rotational movement of the tool plate 20 and into one of the rotational movement of the tool plate 20 comprises opposite rotational movement of each tool shaft 7.
  • such a gear construction 21 includes a rolling collar 22 for reciprocally converting the rotational movement of the tooling plate 20 into the opposite rotational motion of each tool shaft 7 and a power transmission device 23 connected to the center shaft 19 and to at least one direct tool shaft 7a of the group of tool shafts 7 is adapted to transmit the rotational movement of the central shaft 19 to the at least one direct tool shaft 7a.
  • Direct tool shafts 7a in this sense are thus all those tool shafts 7 of the group of tool shafts 7, which are connected to the power transmission device 23 so that the rotational movement of the central shaft 19 is transmitted to them.
  • the at least one direct tool shaft 7a therefore rotates in rotation from the Abracelzkranz 22 and thus pushes the tool plate 20 in a rotational direction of the tool plate 20 on. Conversely, a rotation of the tool plate 20 causes a translational movement of each tool shaft 7, in which then the Abracelzkranz 22 in turn sets the tool shaft 7 in a rotational movement, which is opposite to the rotational movement of the tool plate 20.
  • the invention provides that the tool plate 20 has a balancing mass which is adapted to offset a shift of the center of gravity of the grinding head 5 by the power transmission device 23 so that the center of mass of the Grinding head 5 is located on an axis of the central shaft 19.
  • this is a self-adjusting leveling compound. This can be achieved, for example, by virtue of the fact that the leveling compound is arranged so as to be frictional but movable in a slot in the tool plate 20.
  • At least one indirect tool shaft 7b of the group of tool shafts 7 is set up to be driven in its rotary motion only by the Abdicalzkranz 22.
  • This indirect tool shaft 7b is shown only hidden in the drawing.
  • Indirect tool shafts 7a in this sense are therefore all those tool shafts 7 of the group of tool shafts 7 which are adapted to be driven in their rotary motion exclusively by the Abdozenslzkranz 22 and not just by the power transmission device 23rd
  • under the tool shafts 7 at least one direct tool shaft 7a, which directly over the Power transmission device 23 is driven by the central shaft 19. The movement of the direct tool shaft 7a caused by this output causes a rotation of the tool disc 20 via the rolling ring 22.
  • At least one indirect tool shaft 7b which does not receive its rotational movement via the power transmission device 23 from the central shaft 19, but exclusively by means of the tool shafts 7 of the Abisselzkranzes 22 of the rotation of the tool plate 20. Further tool shafts 7 can either be driven by the power transmission device 23, only by the Abisselzkranz 22 or by both mechanisms.
  • the power transmission device 23 comprises a belt transmission 24.
  • this may be an open belt transmission 24 as in the present case.
  • the belt transmission 24 comprises a toothed belt 25.
  • a particularly simple construction results when the power transmission device 23 is connected to the central shaft 19 and exactly one direct tool shaft 7a. Thus, only one tool shaft, namely the single direct tool shaft 7a, is driven by the medium shaft 19 via the power transmission device 23. Thus, only a minimum of devices for power transmission from the central shaft 19 is required.
  • a particularly compact design of the grinding head 5 is obtained if, according to a preferred embodiment, this comprises a housing shell 26 which encloses a grinding head interior 27 with the tool plate 20. Preferably, this grinding head interior 27 is designed to be closed. The combination of housing shell 26 and tool plate 20 thus completely encloses this grinding head interior 27.
  • a grinding head 5 or its interior - ie the grinding head interior 27 - as described can be characterized in particular by the inevitably occurring dust and other abraded material sealed, that at least one sealing ring 28 for sealing the grinding head interior 27 circumferentially on the tool plate 20 between the tool plate 20 and the housing shell 26 is arranged.
  • at least one sealing ring 28 for sealing the grinding head interior 27 circumferentially on the tool plate 20 between the tool plate 20 and the housing shell 26 is arranged.
  • two Sealing rings 28 circumferentially arranged on the tool plate 20 between the tool plate 20 and the housing shell 26.
  • a still further preferred embodiment of the seal for the grinding head 5 results when the at least one sealing ring 28 exerts a force in the radial direction on the housing shell 26. This ensures a particularly good sealing effect. In particular, it is advantageous if the at least one sealing ring 28 exerts a force only in the radial direction on the housing shell 26.
  • the housing shell 26 comprises an air inlet opening 29 with a filter element 30.
  • the filter element 30 can be exchanged and is adapted to let through air but to block dirt particles.
  • a particularly suitable arrangement of the central shaft 19 in the housing shell 26 is obtained when the central shaft 19 between a central opening 32 of the housing shell 26 and a central shaft 19 enclosing central shaft receptacle 33 of the tool plate 20 is arranged.
  • the central shaft 19 preferably has a drive receptacle 34 for the drive shaft 16.
  • the drive receptacle 34 is aligned with the central opening 32 of the housing shell 26. It is further preferred that the central shaft 19 extends along a central axis 31 of the housing shell 26.
  • the grinding head 5 is then particularly easy to maintain, especially with regard to an exchange of wearing parts, when the tool plate 20 with the central shaft 19, the tool shafts 7, the tool mounts 9, preferably also with the power transmission device 23 forms a connected separation unit, which is set to be separated by removing the central shaft 19 from the central opening 32 of the housing shell 26, preferably also from the Abicalzkranz 22.
  • the center shaft 19 needs to be detached from the central opening 32 in which it is rotatably supported about the center axis 31 but locked along the central axis 31, to the separation unit comprising the center shaft 19, the tool plate 20, the tool shafts 7, Tool fasteners 9 and preferably also the power transmission device 23 replace.
  • this separation unit includes essential wear parts of the grinding head 5, these or the separation unit can be replaced as a whole and then reused in the grinding head 5. It follows that the engagement of the tool shafts 7 in the Abdozenslzkranz 22 is also such that the tool shafts 7 can be easily removed from the Abdozenslzkranz 22.
  • a preferred embodiment further provides that the grinding head interior 27 enclosed by the housing shell 26 and the tool plate 20 is a coherent cavity.
  • the grinding head interior 27 does not consist of several, separate or otherwise isolated individual cavities. As a result, only this single contiguous cavity must be sealed. Also, all components of the separation unit described above are easily accessible by this measure, when the separation unit was only separated from the rest of the grinding head 5.
  • a line of sight in the grinding head interior 27 between the tool plate 20 and the housing shell 26 is made. So there is no structure in the grinding head interior 27 is provided, which would be arranged within this cavity surface between the tool plate 20 and the housing shell 26 and thus the floor and ceiling surface formed by each would at least partially shield each other. Also, this absence of such a separation surface simplifies access to the individual components of the separation unit and reduces the weight of the grinding head 5 as a whole.
  • the Abicalzkranz 33 comprises a fixed to the housing shell 26 connected to the central shaft 19 concentric sun gear 36, which is adapted for a non-positive or positive engagement of the tool wheels 35.
  • the housing shell 26 has a substantially circular base surface 37 and a substantially perpendicular to the base 37, encompassing housing edge 38, wherein the sun gear 36 is connected along a circumference of the base 37 on the housing edge 38 with the housing shell 26.
  • a particularly suitable embodiment with a form fit between the sun gear 36 and the tool wheels 35 results from the fact that the sun gear 36 has teeth pointing radially in the direction of the central shaft 19, which teeth are set up for a positive engagement of corresponding counter teeth of the tool wheels 35. It is then so in both the sun gear 36 and the tool wheels 35 to gears.
  • a suction device 17 for removing abraded material for a grinding device 1 according to the invention is shown.
  • the suction device 17 according to the invention is characterized in that the suction device 17 is arranged with an inner edge 39 for attachment to an outer edge 40 of the grinding head 5.
  • the suction device 17 forms a further structural unit, which can be exchanged independently of the grinding head 5 as well as the already described separation unit of the grinding head 5 and, if necessary, maintained.
  • a design for the suction device 17 has proven to be particularly suitable, in which the suction device 17 comprises a housing ring 41 in the form of a torus cut open along a transverse surface to its axis of symmetry 42.
  • This symmetry axis 42 can be identical to the central axis 31 of the housing shell 26 as in the present case.
  • the corresponding transverse surface is then perpendicular to this axis of symmetry 42.
  • the suction device 17 is set up to surround the outer edge 40 of the housing shell 26 with the inner edge 39. In this way, the suction device 17 is arranged all around the grinding head 5 and can thus ensure that escaping particles can be detected by the suction device 17 in all directions.
  • the suction device 17 can then particularly effectively prevent the escape of particles from the grinding area, when the suction device 17 is designed so that an outer edge 43 of the suction device 17 when mounted on an outer edge 40 of the housing shell 26 relative to the grinding head 5 and in particular with respect to Tool plate 20 protrude in the direction of a grinding surface.
  • the suction device 17 So that as little dust or abraded material as possible can escape from the suction device 17 along the plane of the wall surface to be ground, it is further preferred for the suction device 17 to have brushes 44, which brushes 44 are aligned in the direction of a grinding surface.
  • Such lateral sealing against dust and abraded material is particularly effective if, as preferred, the brushes 44 are arranged on the outer edge 43 of the suction device 17 and if, as particularly advantageous, the brushes 44 are arranged circumferentially around the outer edge 43.
  • an inventive grinding head 5 for a portable grinder 1 for grinding a wall.
  • An inventive grinding head 5 comprises a group of tool shafts 7 which are rotatably mounted about a respective tool axis 8 and each having a tool attachment 9.
  • the grinding head 5 also includes a center shaft 19, a tool plate 20 rotatably mounted about the center shaft 19, the tool shafts 7 being fixedly mounted on the tool plate 20 and eccentric to the center shaft 19, and a gear construction 21 for converting a rotational movement of the center shaft 19 into one
  • This gear construction 21 comprises a Abicalzkranz 22 for mutual conversion of the rotational movement of the tool plate 20 in the opposite rotational movement of each tool shaft 7 and one with the central shaft 19 and at least a direct tool shaft 7a of the group of tool shafts 7 connected power transmission device 23 which is adapted to transmit the rotational movement of the central shaft 19 on the at least one direct tool shaft 7a.
  • the grinding head 5 according to the invention is characterized in that at least one indirect tool shaft 7b of the group of tool shafts 7 is adapted to be driven in its rotary motion exclusively by the Abicalzkranz 22.
  • Preferred embodiments of the grinding head 5 according to the invention result from the embodiments of the portable grinding apparatus 1 and the embodiments of the suction device 17.
  • the use of a grinder 1 with a grinding head 5 for grinding a wall is characterized in that the grinding head 5 comprises a group of tool shafts 7, which are rotatably mounted about a respective tool axis 8 and each have a tool attachment 9.

Description

Die Erfindung betrifft ein tragbares Schleifgerät zum Schleifen einer Wand und einen Schleifkopf für ein tragbares Schleifgerät zum Schleifen einer Wand mit den Merkmalen des Oberbegriffs von Anspruch 1. Die hier gegenständlichen tragbaren Schleifgeräte dienen dazu, senkrecht zum Boden verlaufende Oberflächen, insbesondere Wände an Außenfassaden oder auch innerhalb von Gebäuden, abzuschleifen oder zu polieren. Ein derartiges Gerät ist aus der CH-A5-652 065 bekannt, wobei anstelle des Schleifkopfs ein Bürstenkopf zum Einsatz kommt. Dies kann einerseits dazu dienen, eine raue Oberfläche zu glätten. Andererseits kann es auch notwendig sein, eine beispielsweise durch radioaktives Material kontaminierte Wand durch Abschleifen von solchem Material zu reinigen.
Die Schleifwirkung wird dabei regelmäßig durch ein rotierendes, scheibenartiges Werkzeug erreicht, welches eine Oberfläche aus oder ähnlich zu Schleifpapier oder mit einer sonstigen geeigneten Struktur aufweist und an einem Schleifkopf befestigt ist. Der Schleifkopf wird dann - entweder unmittelbar oder mittels eines längeren Griffabschnitts des Schleifgeräts - an die zu schleifende Wandfläche gehalten. Problematisch an einem solchen Schleifgerät ist, dass mit einem einzelnen rotierenden Werkzeug wie einer Scheibe eine gleichmäßige Schleifwirkung nicht ohne weiteres zu erreichen ist. So tritt regelmäßig eine stärkere Schleifwirkung an den äußeren, mit einer höheren Geschwindigkeit rotierenden Teilen der Scheibe auf als an den inneren Bereichen. Theoretisch tritt in der Mitte des rotierenden Werkzeugs überhaupt keine Schleifwirkung ein, da hier strenggenommen keine Rotation stattfindet. Entsprechend ungleichmäßig wie die Schleifwirkung ist dann auch die Abnutzung des Werkzeugs. Grundsätzlich lässt sich dieses ungleichmäßige Verhalten durch entsprechend ausgleichende Bewegungen des Schleifgeräts durch den Bediener kompensieren. Jedoch ist dies mühsam und setzt ein gewisses Können und eine bestimmte Erfahrung seitens des Benutzers voraus.
Folglich besteht das der Erfindung zugrundeliegende Problem darin, ein Schleifgerät zur Verfügung zu stellen, welches sowohl eine weitgehend gleichmäßige Schleifwirkung auf der Oberfläche gewährleistet als auch tragbar ist und so geführt und bedient werden kann, dass es zum Schleifen einer Wand geeignet ist.The invention relates to a portable grinder for grinding a wall and a grinding head for a portable grinder for grinding a wall having the features of the preamble of claim 1. The subject matter here portable grinders serve perpendicular to the floor surfaces, in particular walls on external facades or even inside buildings, grind or polish. Such a device is from the CH-A5-652,065 known, wherein instead of the grinding head, a brush head is used. This can serve on the one hand to smooth a rough surface. On the other hand, it may also be necessary to clean a wall contaminated by radioactive material, for example, by grinding such material.
The abrasive action is thereby regularly achieved by a rotating, disk-like tool having a surface of or similar to sandpaper or with any other suitable structure and is attached to a grinding head. The grinding head is then - either directly or by means of a longer grip portion of the grinder - held against the wall surface to be ground. The problem with such a grinding device is that with a single rotating tool such as a disc, a uniform grinding action can not be readily achieved. Thus, a stronger abrasive action regularly occurs at the outer parts of the disk which rotate at a higher speed than at the inner regions. Theoretically, no grinding action occurs at all in the center of the rotating tool, since strictly speaking there is no rotation here. The wear of the tool is correspondingly uneven as the grinding effect. Basically, this non-uniform behavior can be compensated by appropriately compensating movements of the grinder by the operator. However, this is cumbersome and requires a certain skill and experience on the part of the user.
Consequently, the problem underlying the invention is to provide a sander which is both substantially uniform Grinding action on the surface is guaranteed as well as portable and can be guided and operated so that it is suitable for grinding a wall.

Dieses Problem wird bei einem Schleifkopf gemäß dem Oberbegriff von Anspruch 1 durch die Merkmale des kennzeichnenden Teils von Anspruch 1 gelöst.This problem is solved in a grinding head according to the preamble of claim 1 by the features of the characterizing part of claim 1.

Bei einem tragbaren Schleifgerät gemäß Anspruch 2 wird das Problem durch die Gesamtheit der Merkmale des Anspruchs 2 gelöst, wobei dieses einen Schleifkopf gemäß Anspruch 1 aufweist. Schließlich wird das erfindungsgemäße Problem bei der Verwendung eines Schleifgeräts mit einem Schleifkopf zum Schleifen einer Wand gelöst. Wesentlich ist die Erkenntnis, dass eine besonders gleichmäßige Schleifwirkung durch das Anbringen von mehreren rotierenden Schleifwerkzeugen am Schleifgerät erreicht wird. Damit die daraus resultierende Gewichtserhöhung am Schleifkopf nicht dazu führt, dass der Schleifkopf nicht mehr bequem an einem Verlängerungsarm geführt werden kann - was erst das gleichmäßige und effektive Schleifen großflächiger Wandflächen ermöglicht - wird der verhältnismäßig schwere Motor, welcher für die Drehung der Schleifwerkzeuge erforderlich ist, in dem Hauptgehäuse und damit nahe an einem Griff des Schleifgeräts untergebracht.In a portable grinding apparatus according to claim 2, the problem is solved by the entirety of the features of claim 2, wherein this has a grinding head according to claim 1. Finally, the problem of the invention is solved by the use of a grinder with a grinding head for grinding a wall. It is essential to realize that a particularly uniform grinding effect is achieved by the attachment of several rotating grinding tools on the grinder. So that the resulting increase in weight at the grinding head does not mean that the grinding head can no longer be conveniently guided on an extension arm-which enables the uniform and effective grinding of large-area wall surfaces-the relatively heavy motor required for the rotation of the grinding tools becomes housed in the main housing and thus close to a handle of the grinder.

Die erfindungsgemäßen Ausgestaltungen beziehen sich auf Merkmale, welche das Bedienen des Schleifgeräts besonders vereinfachen. Damit große Flächen gleichmäßig und über einen längeren Zeitraum geschliffen werden können ist es notwendig, dass der an einem Rohrarm befestigte Schleifkopf präzise und mit möglichst wenig Kraftaufwand geführt werden kann. Hierzu sind die Gewichtsverteilung im Schleifgerät und die Griffmöglichkeiten von Interesse.The embodiments according to the invention relate to features which particularly facilitate the operation of the grinding device. So that large surfaces can be ground uniformly and over a longer period of time, it is necessary that the grinding head attached to a pipe arm can be guided precisely and with as little force as possible. For this, the weight distribution in the grinder and the grip options are of interest.

Bevorzugt wird während des Schleifens ein leichter und damit kontrollierter Druck auf die Wand ausgeübt. Dies geht einfacher, wenn der Schleifkopf nicht einfach an dem Ende eines vollkommen geraden Rohrarmes angebracht ist, sondern dieser in der Art eines Hockeyschlägers einen seitlichen Versatz aufweist. Wie beschrieben lässt sich eine Verringerung der Ungleichmäßigkeit beim Schleifen dadurch erreichen, dass mehrere, nebeneinander angeordnete Schleifwerkzeuge in dem Schleifkopf des Schleifgeräts eingesetzt werden. Schon allein durch die Verringerung des Radius jedes einzelnen Schleifwerkzeugs ergeben sich hieraus geringere Ungleichmäßigkeiten im Schleifverhalten. Jedoch bleiben auch bei einer solchen Lösung Bereiche übrig, in denen grundsätzlich keine Schleifwirkung eintritt. Hierzu zählen insbesondere neben den jeweiligen Rotationsachsen der einzelnen Schleifwerkzeuge auch die Bereiche zwischen den einzelnen, regelmäßig scheibenartigen Schleifwerkzeugen. Eine weitere Verbesserung kann dann erreicht werden, wenn der Schleifkopf nicht nur mehrere einzelne, jeweils scheibenförmige und rotierende Schleifwerkzeuge aufweist, sondern diese noch dazu auf einem Werkzeugteller angeordnet sind, welcher ebenfalls rotiert. Durch die im Ergebnis entstehende überlagerte Rotationsbewegung wird eine weitgehend gleichmäßige Schleifwirkung auf der gesamten Fläche des Schleifkopfes erreicht. Gemäß eben dieser bevorzugten Ausgestaltung muss also eine Drehbewegung sowohl an den einzelnen Schleifwerkzeugen als auch an dem Werkzeugteller selbst erzeugt werden. Es können alle diese Teile des Schleifkopfs dabei direkt oder indirekt durch eine Antriebs- oder Mittelwelle bewegt werden, welche wiederum von einem Motor angetrieben wird. Eine Konstruktion zur Drehimpulsübertragung von einer solchen Mittelwelle auf die Mehrzahl von Schleifwerkzeugen und auf den Werkzeugteller ist aufwändiger als im Falle eines lediglich einzelnen rotierenden Schleifwerkzeugs und erfordert zusätzliche Komponenten. Diese wiederum erhöhen das Gewicht am Schleifkopf, was das Schleifen großflächiger Wände erschwert. Eine bevorzugte Ausgestaltung sieht dabei zur Gewichtsersparnis vor, dass der Drehimpuls von der Mittelwelle auf die jeweilige Werkzeugwelle nur einiger Schleifwerkzeuge übertragen wird. Speziell wird die Drehung des Werkzeugtellers und der übrigen Schleifwerkzeuge dadurch erreicht, dass durch einen Abwälzkranz, welcher mit den Werkzeugwellen aller Schleifwerkzeuge in Eingriff steht, eine Drehbewegung der Werkzeugwellen der Schleifwerkzeuge in eine Drehbewegung des Drehtellers wechselseitig umgewandelt werden kann.Preferably, a light and thus controlled pressure is exerted on the wall during grinding. This is easier if the grinding head is not simply attached to the end of a perfectly straight tube arm, but this has a type of hockey stick a lateral offset. As described, a reduction in unevenness in grinding can be achieved by using a plurality of juxtaposed abrasive tools in the grinding head of the sander. Just by reducing the radius of each grinding tool, this results in lower irregularities in the grinding behavior. However, areas remain in such a solution in which basically no abrasive effect occurs. In addition to the respective axes of rotation of the individual grinding tools, these include, in particular, the areas between the individual, regularly disk-like grinding tools. A further improvement can be achieved if the grinding head not only has a plurality of individual, respectively disc-shaped and rotating grinding tools, but these are also arranged on a tool plate, which also rotates. Due to the resulting superimposed rotational movement, a largely uniform grinding action is achieved over the entire surface of the grinding head. According to precisely this preferred embodiment, therefore, a rotational movement must be generated both on the individual grinding tools and on the tool plate itself. All of these parts of the grinding head can be moved directly or indirectly through a drive or central shaft, which in turn is driven by a motor. A structure for the angular momentum transfer from such a central shaft to the plurality of grinding tools and to the tool plate is more complex than in the case of a single rotating grinding tool and requires additional components. These in turn increase the weight on the grinding head, which makes it difficult to sand large walls. A preferred embodiment provides for weight savings, that the angular momentum is transmitted from the central shaft to the respective tool shaft only some grinding tools. Specifically, the rotation of the tool plate and the rest Grinding tools achieved in that by a Abwälzkranz, which is in engagement with the tool shafts of all grinding tools, a rotational movement of the tool shafts of the grinding tools can be mutually converted into a rotational movement of the turntable.

Folglich reicht dann die Übertragung des Drehimpulses auf die Werkzeugwelle nur eines Schleifwerkzeug, um alle Schleifwerkzeuge und den Werkzeugteller anzutreiben. Die erfindungsgemäße Ausgestaltung des Schleifgeräts nach Anspruch 2 sieht eine elegante Möglichkeit vor, ein Ungleichgewicht des Schleifkopfes, welches sich daraus ergeben könnte, dass die Übertragung des Drehimpulses auf nur einige oder nur eine einzelne Werkzeugwelle erfolgt, zu kompensieren. Dies gewährleistet ein ruhigeres Drehverhalten des Werkzeugtellers. Hierfür ist der Werkzeugteller mit einer, vorzugsweise selbst einstellenden, Ausgleichsmasse ausgestattet, welche dazu eingerichtet ist, eine Verschiebung des Massenmittelpunkts des Schleifkopfs durch die Kraftübertragungsvorrichtung so auszugleichen, dass der Massenmittelpunkt des Schleifkopfs auf einer Achse der Mittelwelle liegt.Consequently, then the transmission of the angular momentum on the tool shaft only one grinding tool enough to drive all the grinding tools and the tool plate. The inventive design of the grinder according to claim 2 provides an elegant way to compensate for an imbalance of the grinding head, which could result from the fact that the transmission of the angular momentum takes place on only a few or only a single tool shaft. This ensures a quieter rotational behavior of the tool plate. For this purpose, the tool plate is equipped with a, preferably self-adjusting, balancing mass, which is adapted to offset a shift of the center of mass of the grinding head by the power transmission device so that the center of mass of the grinding head is located on an axis of the central shaft.

Die besonders bevorzugten Ausgestaltungen gemäß den Ansprüchen 5 und 6 verwirklichen einen besonders geeigneten Mechanismus zur Übertragung des Drehimpulses von der Mittelwelle auf die Werkzeugwelle eines Schleifwerkzeugs in Form eines Riemengetriebes. Ein solches Riemengetriebe ist einerseits in der Lage, bei vergleichsweise einfacher und kostengünstiger Bauweise auch große Kräfte zu übertragen. Andererseits kann der Riemen nötigenfalls mit vergleichsweise geringem Aufwand ersetzt werden.The particularly preferred embodiments according to claims 5 and 6 realize a particularly suitable mechanism for transmitting the angular momentum from the central shaft to the tool shaft of a grinding tool in the form of a belt drive. Such a belt transmission on the one hand is able to transmit large forces in a comparatively simple and cost-effective design. On the other hand, the belt can be replaced if necessary with relatively little effort.

Die bevorzugten Ausgestaltungen gemäß den Ansprüchen 7 und 8 bis 10 sehen erstens vor, dass der Schleifkopf einen einzelnen geschlossenen Hohlraum - nämlich den Schleifkopfinnenraum - umfasst, welcher von dem Werkzeugteller einerseits und der Gehäuseschale andererseits umschlossen wird. In diesem Hohlraum sind alle wesentlichen Komponenten des Schleifkopfs angeordnet. Auf diese Weise wird einerseits Gewicht gespart, indem auf Zwischentrennwände verzichtet wird, und andererseits eine Minimierung der abzudichtenden Stellen erreicht. Zweitens ist in diesen Ausgestaltungen vorgesehen, dass sämtliche beweglichen Komponenten zwecks Wartung zusammen mit dem Werkzeugteller auf einfache Weise von dem Rest des Schleifkopfs abgelöst werden können.The preferred embodiments according to claims 7 and 8 to 10 provide, firstly, that the grinding head comprises a single closed cavity - namely the grinding head interior - which is enclosed by the tool plate on the one hand and the housing shell on the other hand. In this cavity, all the essential components of the grinding head are arranged. In this way, on the one hand weight is saved by dispensing with intermediate dividing walls, and on the other hand minimizing the areas to be sealed. Second, it is provided in these embodiments that all movable components can be easily detached from the rest of the grinding head for maintenance together with the tool plate.

Bevorzugte Ausgestaltungen des Anspruchs 7 wiederum betreffen eine besonders bevorzugte Dichtungsanordnung in Form eines Dichtrings zwischen Werkzeugteller und Gehäuseschale. Eine solche Dichtungsanordnung ist einerseits der Funktionsweise des Schleifkopfs wenig hinderlich, leicht zu warten, kompakt angeordnet und gewährleistet andererseits eine wirksame Abdichtung des Schleifkopfinnenraums vor dem beim Schleifen in großer Menge auftretenden Verschmutzungsmaterial.
Um weiter zu vermeiden, dass abgeschliffenes Material an dem Einsatzort des Schleifgeräts freigesetzt wird oder gar die Funktionsfähigkeit der Mechanik des Schleifkopfs durch Verschmutzung beeinträchtigt, ist gemäß einer weiteren bevorzugten Ausgestaltung eine Absaugvorrichtung vorgesehen, welche das abgeschliffene Material abtransportieren kann, was regelmäßig in einer Umgebung des Schleifkopfes erfolgt. Dieses Absaugen kann auch zu einem Unterdruck innerhalb des Schleifkopfes führen. Damit es als Folge hieraus nicht zu einem unkontrollierten Einsaugen von möglicherweise mit abgeschliffenem Material verschmutzter Umgebungsluft kommt, ist gemäß einer ebenfalls bevorzugten Ausgestaltung vorgesehen, dass die Gehäuseschale eine Lufteinlassöffnung mit einem Filterelement aufweist. Auf diesem kontrollierten Wege kontrolliert Luft kann nicht verschmutzte Luft eintreten und somit den Unterdruck auflösen.Preferred embodiments of claim 7 in turn relate to a particularly preferred sealing arrangement in the form of a sealing ring between the tool plate and housing shell. Such a sealing arrangement is on the one hand, the operation of the grinding head little hindering, easy to maintain, arranged compact and on the other hand ensures effective sealing of the grinding head interior before occurring during grinding in large quantities of contamination.
To further avoid that abraded material is released at the site of the grinder or even impaired the functioning of the mechanics of the grinding head by contamination, a suction device is provided according to a further preferred embodiment, which can carry away the abraded material, which regularly in an environment of Grinding head takes place. This suction can also lead to a negative pressure within the grinding head. In order that, as a consequence, an uncontrolled sucking in of ambient air possibly contaminated with abraded material does not occur, it is provided according to a likewise preferred embodiment that the housing shell has an air inlet opening with a filter element. Controlled air in this controlled way can enter polluted air and thus dissipate the negative pressure.

Die bevorzugten Ausgestaltungen gemäß Anspruch 11 wiederum sehen eine Anordnung des Abwälzkranzes an einem Innenrand der Gehäuseschale und eine Ausbildung als Sonnenrad mit dazu in Eingriff stehenden entsprechenden Rädern auf den Wellen der Schleifwerkzeuge vor. Dies stellt eine besonders robuste Ausbildung eines Abwälzkranzes.The preferred embodiments according to claim 11 in turn provide an arrangement of the Abwälzkranzes on an inner edge of the housing shell and a training as a sun gear with correspondingly engaged corresponding wheels on the shafts of the grinding tools. This represents a particularly robust formation of a Abwälzkranzes.

Im Folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert. In der Zeichnung zeigt

Fig. 1
eine Gesamtansicht eines vorschlagsgemäßen Schleifgeräts, welches einen vorschlagsgemäßen Schleifkopf umfasst, mit einer vorschlagsgemäßen Absaugvorrichtung und
Fig. 2
eine Schnittansicht sowohl des vorschlagsgemäßen Schleifkopfes von dem Schleifgerät aus der Fig. 1 als auch der entsprechenden vorschlagsgemäßen Absaugvorrichtung.
In the following the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. In the drawing shows
Fig. 1
an overall view of a proposed grinder, which comprises a proposed grinding head, with a proposed suction and
Fig. 2
a sectional view of both the proposed grinding head of the grinder from the Fig. 1 as well as the corresponding proposed suction device.

Das in der Zeichnung dargestellte Schleifgerät 1 ist tragbar und kann insbesondere zum Schleifen oder Polieren einer Wand eingesetzt werden. Es weist ein Hauptgehäuse 2 zur Aufnahme eines Motors 3 auf, bei welchem Motor 3 es sich vorzugsweise um einen Elektromotor handelt. Mit dem Hauptgehäuse 2 verbunden ist ein Rohrarm 4. Bei diesem Rohrarm 4 handelt es sich um eine längliche, stabartige Vorrichtung, welche nicht notwendigerweise aus einem Rohr im engeren Sinne bestehen muss. Weiter umfasst das Schleifgerät 1 einen Schleifkopf 5.The grinder 1 shown in the drawing is portable and can be used in particular for grinding or polishing a wall. It has a main housing 2 for receiving a motor 3, wherein the motor 3 is preferably an electric motor. Connected to the main housing 2 is a pipe arm 4. This pipe arm 4 is an elongate, rod-like device, which does not necessarily have to consist of a pipe in the strict sense. Furthermore, the grinding device 1 comprises a grinding head 5.

Der Schleifkopf 5 kann, wie hier dargestellt, an dem von dem Hauptgehäuse 2 entfernten Ende des Rohrarms 4 direkt oder indirekt angeordnet werden um somit das Bearbeiten auch größerer und höherer Wandflächen zu erlauben. Insbesondere kann ein Kopfgelenk 6 zwischen dem Schleifkopf 5 und dem Rohrarm 4 angeordnet sein.The grinding head 5 can, as shown here, be arranged directly or indirectly on the end remote from the main housing 2 of the pipe arm 4, thus allowing the processing of larger and higher wall surfaces. In particular, a head joint 6 can be arranged between the grinding head 5 and the pipe arm 4.

Erfindungsgemäß umfasst der Schleifkopf 5 eine Gruppe von Werkzeugwellen 7, welche um eine jeweilige - gedachte - Werkzeugachse 8 drehbar gelagert sind und jeweils eine Werkzeugbefestigung 9 aufweisen. Eine solche Gruppe von Werkzeugwellen 7 besteht aus mindestens zwei Werkzeugwellen 7.According to the invention, the grinding head 5 comprises a group of tool shafts 7, which are rotatably mounted about a respective imaginary tool axis 8 and each have a tool fastening 9. Such a group of tool shafts 7 consists of at least two tool shafts 7.

Bei den Werkzeugbefestigungen 9 kann es sich um Zapfen 9a handeln, auf welche entsprechende Schleifwerkzeuge 10 geschoben werden können. Alternativ kann es sich auch um Öffnungen handeln, in welche Schleifwerkzeuge eingesetzt werden können. Ein solches Schleifwerkzeug 10 kann, wie vorliegend dargestellt, aus einer auf einem Träger 11 montierte Schaumstoffscheibe 12 handeln, auf deren Unterseite wiederum Schleifpapier befestigt ist oder sonst wie eine derartige Oberflächenstruktur gebildet wird. Nach der Befestigung des Schleifwerkzeugs 10 an der Werkzeugbefestigung 9 dreht sich das Schleifwerkzeug 10 mit der jeweiligen Werkzeugwelle 7 mit. Bei den jeweiligen Werkzeugachsen 8 handelt es sich um eine Achse der jeweiligen Werkzeugwelle 7.The tool fixtures 9 may be pins 9a, on which corresponding grinding tools 10 can be pushed. Alternatively, they may also be openings into which grinding tools can be inserted. Such a grinding tool 10 can, as shown, from a mounted on a support 11 foam disc 12 act on the underside turn sandpaper is attached or otherwise such a surface structure is formed. After attachment of the grinding tool 10 to the tool attachment 9, the grinding tool 10 rotates with the respective tool shaft 7. The respective tool axes 8 are an axis of the respective tool shaft 7.

Bevorzugt ist, dass das Hauptgehäuse 2 einen Hauptgriff 13 und der Rohrarm 4 einen Nebengriff 14 aufweist. Da der Motor 3 regelmäßig die schwerste Einzelkomponente des Schleifgeräts 1 bildet, kann der Bediener des Schleifgeräts 1 dieses mit dem Hauptgriff 13 nahe am Körper und damit mit geringer Anstrengung halten. Der Nebengriff 14, auf den entsprechend weniger Kraftaufwand zum reinen Tragen des Schleifgeräts 1 entfällt, wiederum gibt dem Bediener die Möglichkeit, das Schleifgerät 1 und insbesondere den Schleifkopf 5 präzise zu schwenken. Bei dem Nebengriff 14 kann es sich insbesondere um einen Bügelgriff handeln.It is preferred that the main housing 2 has a main handle 13 and the pipe arm 4 has a secondary handle 14. Since the engine 3 regularly forms the heaviest single component of the grinder 1, the operator of the grinder 1 can keep this with the main handle 13 close to the body and thus with little effort. The auxiliary handle 14, to which correspondingly less force is required for the pure wearing of the grinder 1, in turn gives the operator the ability to precisely pivot the grinder 1 and in particular the grinding head 5. The secondary handle 14 may in particular be a bow handle.

Darauf aufbauend ergeben sich besondere Vorteile, wenn der Massenmittelpunkt des Schleifgeräts 1 zwischen dem Hauptgriff 13 und dem Nebengriff 14 angeordnet sind.Based on this, particular advantages result if the center of mass of the grinding device 1 are arranged between the main handle 13 and the auxiliary handle 14.

Weiter ist bevorzugt, dass ein Kopfgelenk 6 zwischen dem Schleifkopf 5 und dem Rohrarm 4 über eine Halterung 15 mit dem Rohrarm 4 verbunden ist. Diese Halterung 15 ist bevorzugt winkelig oder gekrümmt ausgebildet. Eine solche Konstruktion erleichtert dem Bediener die Dosierung der Andruckkraft des Schleifkopfes 5 unter Verringerung des Risikos, dass der Schleifkopf 5 entlang einer zu bearbeitenden Wandfläche abrutscht. Bei der Halterung 15 kann es sich, wie vorliegend, um ein Paar gebogener Kunststoffarme handeln, welche einerseits mit dem Rohrarm 4 und andererseits mit dem Schleifkopf 5 verbunden sind.It is further preferred that a head joint 6 is connected between the grinding head 5 and the pipe arm 4 via a holder 15 with the pipe arm 4. This holder 15 is preferably angled or curved. Such a construction facilitates the operator's dosage of the pressing force of the grinding head 5 while reducing the risk that the grinding head 5 slips along a wall surface to be processed. In the holder 15 may, as in the present case, be a pair of bent plastic arms, which are connected on the one hand to the pipe arm 4 and on the other hand to the grinding head 5.

Um der Drehbarkeit des Schleifkopfes 5 mittels des Kopfgelenks 6 Rechnung zu tragen ist bevorzugt vorgesehen, dass das Schleifgerät 1 eine von dem Motor 3 angetriebene flexible Antriebswelle 16 aufweist, welche mit dem Schleifkopf 5 verbunden ist. Dabei verläuft die flexible Antriebswelle 16 nicht notwendigerweise über die gesamte Strecke von dem Motor 3 bis zu dem Schleifkopf 5. Wie vorliegend kann auch innerhalb des Rohrarmes 4 eine starre Antriebswelle verlaufen, deren Drehbewegung dann am Ende des Rohrarmes 4 auf die flexible Antriebswelle 16 übertragen wird.In order to take account of the rotatability of the grinding head 5 by means of the head joint 6, it is preferably provided that the grinding device 1 has a flexible drive shaft 16 driven by the motor 3, which is connected to the grinding head 5. In this case, the flexible drive shaft 16 does not necessarily extend over the entire distance from the motor 3 to the grinding head 5. As in the present case, a rigid drive shaft extend inside the pipe arm 4, the rotational movement is then transmitted to the flexible drive shaft 16 at the end of the pipe arm 4 ,

Um eine Verschmutzung der Umgebung der abzuschleifenden Wandfläche und auch des Schleifgeräts selbst zu vermeiden, ist vorteilhafterweise der Schleifkopf 5 zur Befestigung einer Absaugvorrichtung 17 zum Abtransport von abgeschliffenem Material eingerichtet. Bei dieser Absaugvorrichtung 17 kann es sich insbesondere - wie hier dargestellt - um einen ringartigen Aufsatz um den Schleifkopf 5 handeln. Von der Absaugvorrichtung 17 im eigentlichen Sinne verläuft ein Absaugschlauch 18 in den Rohrarm 4, etwa um das abgesaugte Material dann in einem hierfür vorgesehenen Behälter zu sammeln. Die für das Absaugen notwendige Leistung kann auch von dem Motor 3 geliefert werden.In order to avoid contamination of the surroundings of the wall surface to be abraded and also of the grinding device itself, the grinding head 5 is advantageously set up for fastening a suction device 17 for removing abraded material. In this suction device 17 may in particular - As shown here - act around a ring-like attachment to the grinding head 5. From the suction device 17 in the true sense, a suction hose 18 extends into the pipe arm 4, about to collect the extracted material then in a container provided for this purpose. The power required for the suction can also be supplied by the motor 3.

Um eine überlagerte Drehbewegung der einzelnen Werkzeugwellen 7 im Schleifkopf 5 - zusätzlich zu der Drehung der Werkzeugwellen 7 um ihre jeweils eigene Werkzeugachse 8 - zu erreichen, umfasst vorzugsweise der Schleifkopf 5 eine Mittelwelle 19 und einen drehbar um die Mittelwelle 19 gelagerten Werkzeugteller 20. Hierbei sind die Werkzeugwellen 7 ortsfest auf dem Werkzeugteller 20 und exzentrisch zu der Mittelwelle 19 angeordnet.In order to achieve a superimposed rotary motion of the individual tool shafts 7 in the grinding head 5, in addition to the rotation of the tool shafts 7 about their own tool axis 8, the grinding head 5 preferably comprises a central shaft 19 and a tool plate 20 mounted rotatably about the central shaft 19 the tool shafts 7 stationary on the tool plate 20 and arranged eccentrically to the central shaft 19.

Die ortsfeste Anordnung der Werkzeugwellen 7 auf dem Werkzeugteller 20 bedeutet, dass die Werkzeugwellen 7 bei einer Drehbewegung des Werkzeugtellers 20 eine entsprechende translatorische Bewegung mit dem Werkzeugteller 20 ausführen.The stationary arrangement of the tool shafts 7 on the tool plate 20 means that the tool shafts 7 execute a corresponding translational movement with the tool plate 20 during a rotational movement of the tool plate 20.

Bevorzugt ist, dass die Werkzeugachsen 8 zueinander parallel ausgerichtet sind. Eine solche Ausrichtung kann - wie vorliegend - insbesondere auch parallel zur Mittelwelle 19 sein.It is preferred that the tool axes 8 are aligned parallel to each other. Such an orientation can be - as in the present case - in particular also parallel to the central shaft 19.

Um eine Drehung sowohl des Werkzeugtellers 8 als auch der einzelnen Werkzeugwellen 9 über die Drehung der Mittelwelle 19 anzutreiben, ist bevorzugt, dass der Schleifkopf 5 eine Getriebekonstruktion 21 zur Umwandlung einer Drehbewegung der Mittelwelle 19 in eine Drehbewegung des Werkzeugtellers 20 und in eine zu der Drehbewegung des Werkzeugtellers 20 entgegengesetzte Drehbewegung jeder Werkzeugwelle 7 umfasst.In order to drive a rotation of both the tool plate 8 and the individual tool shafts 9 via the rotation of the central shaft 19, it is preferred that the grinding head 5 has a gear construction 21 for converting a rotational movement of the center shaft 19 into a rotational movement of the tool plate 20 and into one of the rotational movement of the tool plate 20 comprises opposite rotational movement of each tool shaft 7.

Insbesondere und wie vorliegend dargestellt umfasst eine solche Getriebekonstruktion 21 einen Abwälzkranz 22 zur wechselseitigen Umwandlung der Drehbewegung des Werkzeugtellers 20 in die entgegengesetzte Drehbewegung jeder Werkzeugwelle 7 und eine mit der Mittelwelle 19 und mit mindestens einer Direktwerkzeugwelle 7a der Gruppe von Werkzeugwellen 7 verbundene Kraftübertragungsvorrichtung 23, welche dazu eingerichtet ist, die Drehbewegung der Mittelwelle 19 auf die mindestens eine Direktwerkzeugwelle 7a zu übertragen.In particular, and as illustrated herein, such a gear construction 21 includes a rolling collar 22 for reciprocally converting the rotational movement of the tooling plate 20 into the opposite rotational motion of each tool shaft 7 and a power transmission device 23 connected to the center shaft 19 and to at least one direct tool shaft 7a of the group of tool shafts 7 is adapted to transmit the rotational movement of the central shaft 19 to the at least one direct tool shaft 7a.

Direktwerkzeugwellen 7a in diesem Sinne sind also alle diejenigen Werkzeugwellen 7 der Gruppe von Werkzeugwellen 7, welche mit der Kraftübertragungsvorrichtung 23 so verbunden sind, dass die Drehbewegung der Mittelwelle 19 auf sie übertragen wird.Direct tool shafts 7a in this sense are thus all those tool shafts 7 of the group of tool shafts 7, which are connected to the power transmission device 23 so that the rotational movement of the central shaft 19 is transmitted to them.

Die mindestens eine Direktwerkzeugwelle 7a wälzt sich also drehend von dem Abwälzkranz 22 ab und drückt somit den Werkzeugteller 20 in einer Drehrichtung des Werkzeugtellers 20 weiter. Umgekehrt bewirkt eine Drehung des Werkzeugtellers 20 eine Translationsbewegung jeder Werkzeugwelle 7, bei der dann der Abwälzkranz 22 wiederum die Werkzeugwelle 7 in eine Drehbewegung versetzt, welche zur Drehbewegung des Werkzeugtellers 20 entgegengesetzt ist.The at least one direct tool shaft 7a therefore rotates in rotation from the Abwälzkranz 22 and thus pushes the tool plate 20 in a rotational direction of the tool plate 20 on. Conversely, a rotation of the tool plate 20 causes a translational movement of each tool shaft 7, in which then the Abwälzkranz 22 in turn sets the tool shaft 7 in a rotational movement, which is opposite to the rotational movement of the tool plate 20.

Dadurch, dass die Kraftübertragungsvorrichtung 23 nicht alle Werkzeugwellen 7 mit der Mittelwelle 19 verbindet, kann sich eine asymmetrische Gewichtsverteilung innerhalb des Schleifkopfes 5 ergeben. Um sich hieraus möglicherweise ergebende Unwuchten bei der Drehung des Werkzeugtellers 20 zu vermeiden, ist erfindungsgemäß vorgesehen, dass der Werkzeugteller 20 eine Ausgleichsmasse aufweist, welche dazu eingerichtet ist, eine Verschiebung des Massenmittelpunkts des Schleifkopfs 5 durch die Kraftübertragungsvorrichtung 23 so auszugleichen, dass der Massenmittelpunkt des Schleifkopfs 5 auf einer Achse der Mittelwelle 19 liegt. Erfindungsgemäß handelt es sich dabei um eine sich selbst einstellende Ausgleichsmasse. Dies kann etwa dadurch erreicht werden, dass die Ausgleichsmasse reibungsbehaftet aber beweglich in einem Schlitz des Werkzeugtellers 20 angeordnet ist. Erfindungsgemäß ist mindestens eine Indirektwerkzeugwelle 7b der Gruppe von Werkzeugwellen 7 dazu eingerichtet, in ihrer Drehbewegung nur durch den Abwälzkranz 22 angetrieben zu werden. Diese Indirektwerkzeugwelle 7b ist in der Zeichnung nur verdeckt dargestellt. Indirektwerkzeugwellen 7a in diesem Sinne sind also alle diejenigen Werkzeugwellen 7 der Gruppe von Werkzeugwellen 7, welche dazu eingerichtet sind, in ihrer Drehbewegung ausschließlich durch den Abwälzkranz 22 angetrieben zu werden und eben nicht durch die Kraftübertragungsvorrichtung 23.
Mit anderen Worten gibt es gemäß dieser Ausführungsform unter den Werkzeugwellen 7 mindestens eine Direktwerkzeugwelle 7a, welche direkt über die Kraftübertragungsvorrichtung 23 von der Mittelwelle 19 angetrieben wird. Die durch diesen Abtrieb bewirkte Bewegung der Direktwerkzeugwelle 7a verursacht über den Abwälzkranz 22 eine Drehung des Werkzeugtellers 20. Erfindungsgemäß gibt es nun unter den Werkzeugwellen 7 mindestens eine Indirektwerkzeugwelle 7b, welche ihre Drehbewegung nicht über die Kraftübertragungsvorrichtung 23 von der Mittelwelle 19 erhält, sondern ausschließlich mittels des Abwälzkranzes 22 von der Drehung des Werkzeugtellers 20. Weitere Werkzeugwellen 7 können dabei entweder auch von der Kraftübertragungsvorrichtung 23, nur durch den Abwälzkranz 22 oder durch beide Mechanismen angetrieben werden.The fact that the power transmission device 23 does not connect all the tool shafts 7 to the central shaft 19 may result in an asymmetrical weight distribution within the grinding head 5. In order to avoid possible resulting imbalances in the rotation of the tool plate 20, the invention provides that the tool plate 20 has a balancing mass which is adapted to offset a shift of the center of gravity of the grinding head 5 by the power transmission device 23 so that the center of mass of the Grinding head 5 is located on an axis of the central shaft 19. According to the invention, this is a self-adjusting leveling compound. This can be achieved, for example, by virtue of the fact that the leveling compound is arranged so as to be frictional but movable in a slot in the tool plate 20. According to the invention, at least one indirect tool shaft 7b of the group of tool shafts 7 is set up to be driven in its rotary motion only by the Abwälzkranz 22. This indirect tool shaft 7b is shown only hidden in the drawing. Indirect tool shafts 7a in this sense are therefore all those tool shafts 7 of the group of tool shafts 7 which are adapted to be driven in their rotary motion exclusively by the Abwälzkranz 22 and not just by the power transmission device 23rd
In other words, there are according to this embodiment, under the tool shafts 7 at least one direct tool shaft 7a, which directly over the Power transmission device 23 is driven by the central shaft 19. The movement of the direct tool shaft 7a caused by this output causes a rotation of the tool disc 20 via the rolling ring 22. According to the invention, at least one indirect tool shaft 7b, which does not receive its rotational movement via the power transmission device 23 from the central shaft 19, but exclusively by means of the tool shafts 7 of the Abwälzkranzes 22 of the rotation of the tool plate 20. Further tool shafts 7 can either be driven by the power transmission device 23, only by the Abwälzkranz 22 or by both mechanisms.

Besonders bevorzugt ist nun, dass die Kraftübertragungsvorrichtung 23 ein Riemengetriebe 24 aufweist. Insbesondere kann es sich dabei wie vorliegend um ein offenes Riemengetriebe 24 handeln. Bevorzugt ist auch, dass das Riemengetriebe 24 einen Zahnriemen 25 umfasst.It is particularly preferred that the power transmission device 23 comprises a belt transmission 24. In particular, this may be an open belt transmission 24 as in the present case. It is also preferred that the belt transmission 24 comprises a toothed belt 25.

Eine besonders einfache Konstruktion ergibt sich dann, wenn die Kraftübertragungsvorrichtung 23 mit der Mittelwelle 19 und genau einer Direktwerkzeugwelle 7a verbunden ist. Es wird also nur genau eine Werkzeugwelle, nämlich die einzelne Direktwerkzeugwelle 7a, über die Kraftübertragungsvorrichtung 23 von der Mittelwelle 19 angetrieben. Damit ist nur ein Minimum an Vorrichtungen zur Kraftübertragung von der Mittelwelle 19 erforderlich.
Eine besonders kompakte Ausführung des Schleifkopfes 5 ergibt sich, wenn dieser gemäß einer bevorzugten Ausführungsform eine Gehäuseschale 26 umfasst, welche mit dem Werkzeugteller 20 einen Schleifkopfinnenraum 27 umschließt. Bevorzugt ist dieser Schleifkopfinnenraum 27 geschlossen gestaltet. Die Kombination aus Gehäuseschale 26 und Werkzeugteller 20 umhüllt also diesen Schleifkopfinnenraum 27 wesentlich vollständig.
Ein Schleifkopf 5 bzw. sein Innenraum - also der Schleifkopfinnenraum 27 - wie beschrieben kann insbesondere dadurch günstig vor dem unweigerlich auftretenden Staub und anderem abgeschliffenen Material abgedichtet werden, dass mindestens ein Dichtring 28 zum Abdichten des Schleifkopfinnenraums 27 umlaufend am Werkzeugteller 20 zwischen dem Werkzeugteller 20 und der Gehäuseschale 26 angeordnet ist. In dem vorliegend dargestellten Fall sind speziell zwei Dichtringe 28 umlaufend am Werkzeugteller 20 zwischen dem Werkzeugteller 20 und der Gehäuseschale 26 angeordnet.A particularly simple construction results when the power transmission device 23 is connected to the central shaft 19 and exactly one direct tool shaft 7a. Thus, only one tool shaft, namely the single direct tool shaft 7a, is driven by the medium shaft 19 via the power transmission device 23. Thus, only a minimum of devices for power transmission from the central shaft 19 is required.
A particularly compact design of the grinding head 5 is obtained if, according to a preferred embodiment, this comprises a housing shell 26 which encloses a grinding head interior 27 with the tool plate 20. Preferably, this grinding head interior 27 is designed to be closed. The combination of housing shell 26 and tool plate 20 thus completely encloses this grinding head interior 27.
A grinding head 5 or its interior - ie the grinding head interior 27 - as described can be characterized in particular by the inevitably occurring dust and other abraded material sealed, that at least one sealing ring 28 for sealing the grinding head interior 27 circumferentially on the tool plate 20 between the tool plate 20 and the housing shell 26 is arranged. In the case shown here are specifically two Sealing rings 28 circumferentially arranged on the tool plate 20 between the tool plate 20 and the housing shell 26.

Eine noch weiter bevorzugte Ausgestaltung der Dichtung für den Schleifkopf 5 ergibt sich, wenn der mindestens eine Dichtring 28 eine Kraft in radialer Richtung auf die Gehäuseschale 26 ausübt. Damit wird eine besonders gute Dichtwirkung gewährleistet. Insbesondere ist es vorteilhaft, wenn der mindestens eine Dichtring 28 eine Kraft nur in radialer Richtung auf die Gehäuseschale 26 ausübt.A still further preferred embodiment of the seal for the grinding head 5 results when the at least one sealing ring 28 exerts a force in the radial direction on the housing shell 26. This ensures a particularly good sealing effect. In particular, it is advantageous if the at least one sealing ring 28 exerts a force only in the radial direction on the housing shell 26.

Vorteilhafterweise umfasst die Gehäuseschale 26 eine Lufteinlassöffnung 29 mit einem Filterelement 30. Das Filterelement 30 lässt sich austauschen und ist dazu eingerichtet, Luft durchzulassen aber Schmutzpartikel zu blockieren.Advantageously, the housing shell 26 comprises an air inlet opening 29 with a filter element 30. The filter element 30 can be exchanged and is adapted to let through air but to block dirt particles.

Eine besonders geeignete Anordnung der Mittelwelle 19 in der Gehäuseschale 26 ergibt sich dann, wenn die Mittelwelle 19 zwischen einer Mittelöffnung 32 der Gehäuseschale 26 und einer die Mittelwelle 19 umschließenden Mittelwellenaufnahme 33 des Werkzeugtellers 20 angeordnet ist. Hierbei weist die Mittelwelle 19 bevorzugt eine Antriebsaufnahme 34 für die Antriebswelle 16 auf. Über diese Antriebsaufnahme 34 wird die Drehung der Antriebswelle 16 auf die Mittelwelle 19 übertragen. Die Antriebsaufnahme 34 fluchtet dabei mit der Mittelöffnung 32 der Gehäuseschale 26. Bevorzugt ist dabei weiter, dass die Mittelwelle 19 entlang einer Mittelachse 31 der Gehäuseschale 26 verläuft.A particularly suitable arrangement of the central shaft 19 in the housing shell 26 is obtained when the central shaft 19 between a central opening 32 of the housing shell 26 and a central shaft 19 enclosing central shaft receptacle 33 of the tool plate 20 is arranged. Here, the central shaft 19 preferably has a drive receptacle 34 for the drive shaft 16. About this drive receptacle 34, the rotation of the drive shaft 16 is transmitted to the central shaft 19. The drive receptacle 34 is aligned with the central opening 32 of the housing shell 26. It is further preferred that the central shaft 19 extends along a central axis 31 of the housing shell 26.

Der Schleifkopf 5 ist dann besonders einfach zu warten, vor allem im Hinblick auf einen Austausch von Verschleißteilen, wenn der Werkzeugteller 20 mit der Mittelwelle 19, den Werkzeugwellen 7, den Werkzeugbefestigungen 9, vorzugsweise auch mit der Kraftübertragungsvorrichtung 23 eine verbundene Trenneinheit bildet, welche dazu eingerichtet ist, durch ein Herausnehmen der Mittelwelle 19 aus der Mittelöffnung 32 von der Gehäuseschale 26, vorzugsweise auch von dem Abwälzkranz 22, getrennt zu werden. Mit anderen Worten muss lediglich die Mittelwelle 19 von der Mittelöffnung 32, in der sie um die Mittelachse 31 drehbar gelagert aber entlang der Mittelachse 31 arretiert ist, gelöst werden, um die Trenneinheit umfassend die Mittelwelle 19, den Werkzeugteller 20, den Werkzeugwellen 7, den Werkzeugbefestigungen 9 und vorzugsweise auch die Kraftübertragungsvorrichtung 23 abzulösen. Da diese Trenneinheit die wesentlichen Verschleißteile des Schleifkopfs 5 umfasst, können diese oder die Trenneinheit als Ganzes ersetzt und dann wieder in den Schleifkopf 5 eingesetzt werden. Hieraus ergibt sich, dass der Eingriff der Werkzeugwellen 7 in den Abwälzkranz 22 auch dergestalt ist, dass sich die Werkzeugwellen 7 vom Abwälzkranz 22 einfach abziehen lassen.The grinding head 5 is then particularly easy to maintain, especially with regard to an exchange of wearing parts, when the tool plate 20 with the central shaft 19, the tool shafts 7, the tool mounts 9, preferably also with the power transmission device 23 forms a connected separation unit, which is set to be separated by removing the central shaft 19 from the central opening 32 of the housing shell 26, preferably also from the Abwälzkranz 22. In other words, only the center shaft 19 needs to be detached from the central opening 32 in which it is rotatably supported about the center axis 31 but locked along the central axis 31, to the separation unit comprising the center shaft 19, the tool plate 20, the tool shafts 7, Tool fasteners 9 and preferably also the power transmission device 23 replace. Since this separation unit the includes essential wear parts of the grinding head 5, these or the separation unit can be replaced as a whole and then reused in the grinding head 5. It follows that the engagement of the tool shafts 7 in the Abwälzkranz 22 is also such that the tool shafts 7 can be easily removed from the Abwälzkranz 22.

Eine bevorzugte Ausführungsform sieht weiter vor, dass der von der Gehäuseschale 26 und dem Werkzeugteller 20 umschlossene Schleifkopfinnenraum 27 ein zusammenhängender Hohlraum ist. Das bedeutet, dass der Schleifkopfinnenraum 27 nicht aus mehreren, voneinander getrennten oder sonst wie isolierten einzelnen Hohlräumen besteht. Dadurch muss nur dieser einzelne zusammenhängende Hohlraum abgedichtet werden. Es sind auch alle Komponenten der oben beschriebenen Trenneinheit durch diese Maßnahme leicht zugänglich, wenn die Trenneinheit erst von dem Rest des Schleifkopfes 5 getrennt wurde.A preferred embodiment further provides that the grinding head interior 27 enclosed by the housing shell 26 and the tool plate 20 is a coherent cavity. This means that the grinding head interior 27 does not consist of several, separate or otherwise isolated individual cavities. As a result, only this single contiguous cavity must be sealed. Also, all components of the separation unit described above are easily accessible by this measure, when the separation unit was only separated from the rest of the grinding head 5.

Ebenso ist es bevorzugt, dass eine Sichtlinie in dem Schleifkopfinnenraum 27 zwischen dem Werkzeugteller 20 und der Gehäuseschale 26 besteht. Es ist also keine Struktur in dem Schleifkopfinnenraum 27 vorhanden, welche innerhalb dieses Hohlraumes flächig zwischen dem Werkzeugteller 20 und der Gehäuseschale 26 angeordnet wäre und damit die durch sie jeweils gebildete Boden- und Deckenfläche voneinander zumindest teilweise abschirmen würde. Auch diese Abwesenheit einer solchen Trennfläche vereinfacht den Zugang zu den einzelnen Komponenten der Trenneinheit und verringert das Gewicht des Schleifkopfes 5 insgesamt.Likewise, it is preferred that a line of sight in the grinding head interior 27 between the tool plate 20 and the housing shell 26 is made. So there is no structure in the grinding head interior 27 is provided, which would be arranged within this cavity surface between the tool plate 20 and the housing shell 26 and thus the floor and ceiling surface formed by each would at least partially shield each other. Also, this absence of such a separation surface simplifies access to the individual components of the separation unit and reduces the weight of the grinding head 5 as a whole.

Eine Ausgestaltung des Schleifkopfes 5 und speziell des Abwälzkranzes 22, welche die Übertragung großer Kräfte auf die Werkzeugwellen 7 und damit auch auf den Werkzeugteller 20 sowie eine gute Führung des ganzen Mechanismus erlaubt, sieht vor, dass an den Werkzeugwellen 7 Werkzeugräder 35 angeordnet sind. Weiter bevorzugt ist, dass der Abwälzkranz 33 ein fest mit der Gehäuseschale 26 verbundenes, zur Mittelwelle 19 konzentrisches Sonnenrad 36 umfasst, welches für einen kraft- oder formschlüssigen Eingriff der Werkzeugräder 35 eingerichtet ist.An embodiment of the grinding head 5 and especially the Abwälzkranzes 22, which allows the transmission of large forces on the tool shafts 7 and thus also on the tool plate 20 and a good guidance of the whole mechanism, provides that on the tool shafts 7 tool wheels 35 are arranged. It is further preferred that the Abwälzkranz 33 comprises a fixed to the housing shell 26 connected to the central shaft 19 concentric sun gear 36, which is adapted for a non-positive or positive engagement of the tool wheels 35.

Dabei ist besonders bevorzugt, dass die Gehäuseschale 26 eine wesentlich kreisförmige Grundfläche 37 und einen zur Grundfläche 37 wesentlich rechtwinkligen, umlaufenden Gehäuserand 38 umfasst, wobei das Sonnenrad 36 entlang eines Umfangs der Grundfläche 37 am Gehäuserand 38 mit der Gehäuseschale 26 verbunden ist.
Eine besonders geeignete Ausgestaltung mit einem Formschluss zwischen dem Sonnenrad 36 und den Werkzeugrädern 35 ergibt sich dadurch, dass das Sonnenrad 36 radial in Richtung der Mittelwelle 19 weisende Zähne aufweist, welche für einen formschlüssigen Eingriff entsprechender Gegenzähne der Werkzeugräder 35 eingerichtet sind. Es handelt sich dann also sowohl bei dem Sonnenrad 36 als auch bei den Werkzeugrädern 35 um Zahnräder.It is particularly preferred that the housing shell 26 has a substantially circular base surface 37 and a substantially perpendicular to the base 37, encompassing housing edge 38, wherein the sun gear 36 is connected along a circumference of the base 37 on the housing edge 38 with the housing shell 26.
A particularly suitable embodiment with a form fit between the sun gear 36 and the tool wheels 35 results from the fact that the sun gear 36 has teeth pointing radially in the direction of the central shaft 19, which teeth are set up for a positive engagement of corresponding counter teeth of the tool wheels 35. It is then so in both the sun gear 36 and the tool wheels 35 to gears.

Ebenfalls in den Fig. 1 und 2 ist eine Absaugvorrichtung 17 zum Abtransport von abgeschliffenem Material für ein erfindungsgemäßes Schleifgerät 1 dargestellt. Die erfindungsgemäße Absaugvorrichtung 17 zeichnet sich dadurch aus, dass die Absaugvorrichtung 17 mit einer Innenkante 39 zur Befestigung an einem äußeren Rand 40 des Schleifkopfs 5 eingerichtet ist.
Vorzugsweise bedeutet dies, dass die Absaugvorrichtung 17 zur Befestigung an einem äußeren Rand 40 der Gehäuseschale 26 eingerichtet ist. Auf diese Weise bildet die Absaugvorrichtung 17 eine weitere Baueinheit, welche unabhängig sowohl von dem Schleifkopf 5 als auch von der bereits beschriebenen Trenneinheit des Schleifkopfs 5 ausgetauscht und ggf. gewartet werden kann.
Als besonders geeignet hat sich eine Formgebung für die Absaugvorrichtung 17 erwiesen, bei der die Absaugvorrichtung 17 einen Gehäusering 41 in Form eines entlang einer Querfläche zu seiner Symmetrieachse 42 aufgeschnittenen Torus umfasst. Diese Symmetrieachse 42 kann wie vorliegend identisch zur Mittelachse 31 der Gehäuseschale 26 sein. Die entsprechende Querfläche ist dann senkrecht zu dieser Symmetrieachse 42.Also in the Fig. 1 and 2 a suction device 17 for removing abraded material for a grinding device 1 according to the invention is shown. The suction device 17 according to the invention is characterized in that the suction device 17 is arranged with an inner edge 39 for attachment to an outer edge 40 of the grinding head 5.
This preferably means that the suction device 17 is adapted for attachment to an outer edge 40 of the housing shell 26. In this way, the suction device 17 forms a further structural unit, which can be exchanged independently of the grinding head 5 as well as the already described separation unit of the grinding head 5 and, if necessary, maintained.
A design for the suction device 17 has proven to be particularly suitable, in which the suction device 17 comprises a housing ring 41 in the form of a torus cut open along a transverse surface to its axis of symmetry 42. This symmetry axis 42 can be identical to the central axis 31 of the housing shell 26 as in the present case. The corresponding transverse surface is then perpendicular to this axis of symmetry 42.

Bevorzugt ist weiterhin, dass die Absaugvorrichtung 17 dazu eingerichtet ist, mit der Innenkante 39 den äußeren Rand 40 der Gehäuseschale 26 zu umschließen. Auf diese Weise ist die Absaugvorrichtung 17 rundherum um den Schleifkopf 5 angeordnet und kann damit sicherstellen, dass entweichende Partikel in allen Richtungen von der Absaugvorrichtung 17 erfasst werden können.It is furthermore preferred that the suction device 17 is set up to surround the outer edge 40 of the housing shell 26 with the inner edge 39. In this way, the suction device 17 is arranged all around the grinding head 5 and can thus ensure that escaping particles can be detected by the suction device 17 in all directions.

Die Absaugvorrichtung 17 kann dann besonders wirksam ein Entweichen von Partikel aus dem Schleifbereich verhindern, wenn die Absaugvorrichtung 17 so ausgestaltet ist, dass eine Außenkante 43 der Absaugvorrichtung 17 bei einer Befestigung an einem äußeren Rand 40 der Gehäuseschale 26 gegenüber dem Schleifkopf 5 und insbesondere gegenüber dem Werkzeugteller 20 in Richtung einer Schleiffläche vorstehen.The suction device 17 can then particularly effectively prevent the escape of particles from the grinding area, when the suction device 17 is designed so that an outer edge 43 of the suction device 17 when mounted on an outer edge 40 of the housing shell 26 relative to the grinding head 5 and in particular with respect to Tool plate 20 protrude in the direction of a grinding surface.

Damit aus der Absaugvorrichtung 17 entlang der Ebene der zu schleifenden Wandoberfläche möglichst wenig Staub oder abgeschliffenes Material entweichen kann, ist weiter bevorzugt vorgesehen, dass die Absaugvorrichtung 17 Bürsten 44 aufweist, welche Bürsten 44 in Richtung einer Schleiffläche ausgerichtet sind.So that as little dust or abraded material as possible can escape from the suction device 17 along the plane of the wall surface to be ground, it is further preferred for the suction device 17 to have brushes 44, which brushes 44 are aligned in the direction of a grinding surface.

Ein solches seitliches Abdichten gegenüber Staub und abgeschliffenem Material ist dann besonders wirksam, wenn, wie bevorzugt, die Bürsten 44 an der Außenkante 43 der Absaugvorrichtung 17 angeordnet sind und wenn, wie besonders vorteilhaft, die Bürsten 44 umlaufend um die Außenkante 43 angeordnet sind.Such lateral sealing against dust and abraded material is particularly effective if, as preferred, the brushes 44 are arranged on the outer edge 43 of the suction device 17 and if, as particularly advantageous, the brushes 44 are arranged circumferentially around the outer edge 43.

In der Fig. 2 ist ein erfindungsgemäßer Schleifkopf 5 für ein tragbares Schleifgerät 1 zum Schleifen einer Wand dargestellt. Ein erfindungsgemäßer Schleifkopf 5 umfasst eine Gruppe von Werkzeugwellen 7, welche um eine jeweilige Werkzeugachse 8 drehbar gelagert sind und jeweils eine Werkzeugbefestigung 9 aufweisen. Der Schleifkopf 5 umfasst auch eine Mittelwelle 19, einen drehbar um die Mittelwelle 19 gelagerten Werkzeugteller 20, wobei die Werkzeugwellen 7 ortsfest auf dem Werkzeugteller 20 und exzentrisch zu der Mittelwelle 19 angeordnet sind, und eine Getriebekonstruktion 21 zur Umwandlung einer Drehbewegung der Mittelwelle 19 in eine Drehbewegung des Werkzeugtellers 20 und in eine zu der Drehbewegung des Werkzeugtellers 20 entgegengesetzte Drehbewegung jeder Werkzeugwelle 7. Diese Getriebekonstruktion 21 umfasst einen Abwälzkranz 22 zur wechselseitigen Umwandlung der Drehbewegung des Werkzeugtellers 20 in die entgegengesetzte Drehbewegung jeder Werkzeugwelle 7 und eine mit der Mittelwelle 19 und mit mindestens einer Direktwerkzeugwelle 7a der Gruppe von Werkzeugwellen 7 verbundene Kraftübertragungsvorrichtung 23 umfasst, welche dazu eingerichtet ist, die Drehbewegung der Mittelwelle 19 auf die mindestens eine Direktwerkzeugwelle 7a zu übertragen. Der erfindungsgemäße Schleifkopf 5 ist dadurch gekennzeichnet, dass mindestens eine Indirektwerkzeugwelle 7b der Gruppe von Werkzeugwellen 7 dazu eingerichtet ist, in ihrer Drehbewegung ausschließlich durch den Abwälzkranz 22 angetrieben zu werden.
Bevorzugte Ausführungsformen des erfindungsgemäßen Schleifkopf 5 ergeben sich aus den Ausführungsformen des tragbaren Schleifgeräts 1 und den Ausführungsformen der Absaugvorrichtung 17.In the Fig. 2 an inventive grinding head 5 is shown for a portable grinder 1 for grinding a wall. An inventive grinding head 5 comprises a group of tool shafts 7 which are rotatably mounted about a respective tool axis 8 and each having a tool attachment 9. The grinding head 5 also includes a center shaft 19, a tool plate 20 rotatably mounted about the center shaft 19, the tool shafts 7 being fixedly mounted on the tool plate 20 and eccentric to the center shaft 19, and a gear construction 21 for converting a rotational movement of the center shaft 19 into one This gear construction 21 comprises a Abwälzkranz 22 for mutual conversion of the rotational movement of the tool plate 20 in the opposite rotational movement of each tool shaft 7 and one with the central shaft 19 and at least a direct tool shaft 7a of the group of tool shafts 7 connected power transmission device 23 which is adapted to transmit the rotational movement of the central shaft 19 on the at least one direct tool shaft 7a. The grinding head 5 according to the invention is characterized in that at least one indirect tool shaft 7b of the group of tool shafts 7 is adapted to be driven in its rotary motion exclusively by the Abwälzkranz 22.
Preferred embodiments of the grinding head 5 according to the invention result from the embodiments of the portable grinding apparatus 1 and the embodiments of the suction device 17.

Die Verwendung eines Schleifgeräts 1 mit einem Schleifkopf 5 zum Schleifen einer Wand ist dadurch gekennzeichnet, dass der Schleifkopf 5 eine Gruppe von Werkzeugwellen 7 umfasst, welche um eine jeweilige Werkzeugachse 8 drehbar gelagert sind und jeweils eine Werkzeugbefestigung 9 aufweisen. The use of a grinder 1 with a grinding head 5 for grinding a wall is characterized in that the grinding head 5 comprises a group of tool shafts 7, which are rotatably mounted about a respective tool axis 8 and each have a tool attachment 9.

Claims (12)

  1. Sanding head (5) for a portable sander (1) for sanding a wall, having a group of tool shafts (7) which are mounted so as to rotate about respective tool axes (8) and each have a tool fastener (9),
    a central shaft (19),
    a tool plate (20) mounted so as to rotate about the central shaft (19),
    wherein the tool shafts (7) are arranged in a fixed position on the tool plate (20) and are arranged eccentrically to the central shaft (19),
    a transmission construction (21) for converting a rotary movement of the central shaft (19) into a rotary movement of the tool plate (20) and into a rotary movement of each tool shaft (7) counter to the rotary movement of the tool plate (20), wherein the transmission construction (21) comprises
    a roller ring (22) for reciprocally converting the rotary movement of the tool plate (20) into the opposite rotary movement of each tool shaft (7), and
    a force transmission device (23) connected to the central shaft (19) and to at least one direct tool shaft (7a) of the group of tool shafts (7), said force transmission device (23) being designed to transmit the rotary movement of the central shaft (19) to the at least one direct tool shaft (7a), wherein at least one indirect tool shaft (7b) of the group of tool shafts (7) is designed to be driven in rotary movement only by the roller ring (22),
    characterized
    in that the tool plate (20) has a self-setting compensating mass which is configured to compensate a displacement of the centre of mass of the sanding head (5) by way of the force transmission device (23) such that the centre of mass of the sanding head (5) lies on an axis of the central shaft (19).
  2. Portable sander (1) for sanding a wall, having
    a main housing (2) for accommodating a motor (3),
    a tube arm (4) which is connected to the main housing (2), and
    a sanding head (5) according to Claim 1.
  3. Portable sander (1) according to Claim 2, characterized in that the main housing (2) has a main handle (13) and the tube arm (4) has a secondary handle (14), preferably in that the centre of mass of the sander (1) is arranged between the main handle (13) and the secondary handle (14).
  4. Portable sander (1) according to Claim 2 or 3, characterized in that a head joint (6) between the sanding head (5) and the tube arm (4) is connected to the tube arm (4) via a mount (15) which is configured in an angular or curved manner, and/or in that the sander (1) has a flexible drive shaft (16) which is driven by the motor (3) and is connected to the sanding head (5).
  5. Portable sander (1) according to one of Claims 2 to 4, characterized in that the force transmission device (23) has a, preferably open, belt drive (24), wherein preferably the belt drive (24) comprises a toothed belt (25).
  6. Portable sander (1) according to one of Claims 2 to 5, characterized in that the force transmission device (23) is connected to the central shaft (19) and exactly one direct tool shaft (7a).
  7. Portable sander (1) according to one of Claims 2 to 6, characterized in that the sanding head (5) comprises a housing shell (26) which encloses, with the tool plate (20), a, preferably closed, sanding head interior (27), preferably in that at least one sealing ring (28) for sealing off the sanding head interior (27) is arranged in an encircling manner on the tool plate (20) between the tool plate (20) and the housing shell (26), more preferably in that the at least one sealing ring (28) exerts a force in a radial direction, preferably only in a radial direction, on the housing shell (26).
  8. Portable sander (1) according to Claim 7, characterized in that the central shaft (19), which preferably extends along a central axis (23) of the housing shell (26), is arranged between a central opening (32) in the housing shell (26) and a central-shaft receptacle (33), enclosing the central shaft (19), of the tool plate (20), preferably wherein the central shaft (19) has a drive receptacle (34) for the drive shaft (16).
  9. Portable sander (1) according to Claim 7 or 8, characterized in that the tool plate (20) forms, with the central shaft (19), the tool shafts (7) and the tool fasteners (9), preferably also with the force transmission device (23), a connected separable unit which is designed to be separated from the housing shell (26), preferably also from the roller ring (22), by the central shaft (19) being removed from the central opening (32).
  10. Portable sander (1) according to one of Claims 7 to 9, characterized in that the sanding head interior (27), which is enclosed by the housing shell (26) and the tool plate (20), is a cohesive cavity, preferably in that a line of sight exists in the sanding head interior (27) between the tool plate (20) and the housing shell (26).
  11. Portable sander (1) according to one of Claims 2 to 10, characterized in that tool wheels (35) are arranged on the tool shafts (7), preferably in that the roller ring (22) comprises a sun wheel (36) that is connected firmly to the housing shell (26) and is concentric with the central shaft (19), said sun wheel (36) being designed for force- or form-fitting engagement of the tool wheels (35), more preferably in that the housing shell (26) comprises a substantially circular base (37) and an encircling housing rim (38) that is substantially at right angles to the base (37), wherein the sun wheel (36) is connected to the housing shell (26), around a circumference of the base (37), at the housing rim (38), more preferably in that the sun wheel (36) has teeth directed radially in the direction of the central shaft (19), said teeth being designed for form-fitting engagement of corresponding counter-teeth on the tool wheels (35).
  12. Portable sander (1) according to one of Claims 2 to 11, characterized by a suction-extraction device (17) for transporting away sanded-off material, wherein the suction-extraction device (17) is designed with an inner edge (39) to be fastened to an outer rim (40) of the sanding head (5), preferably designed to be fastened to an outer rim (40) of the housing shell (26).
EP13186470.4A 2012-09-27 2013-09-27 Portable sanding device for sanding a wall Active EP2712705B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202012009284.7U DE202012009284U1 (en) 2012-09-27 2012-09-27 Portable grinder for grinding a wall

Publications (3)

Publication Number Publication Date
EP2712705A2 EP2712705A2 (en) 2014-04-02
EP2712705A3 EP2712705A3 (en) 2016-12-21
EP2712705B1 true EP2712705B1 (en) 2018-01-31

Family

ID=49293499

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13186470.4A Active EP2712705B1 (en) 2012-09-27 2013-09-27 Portable sanding device for sanding a wall

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EP (1) EP2712705B1 (en)
DE (1) DE202012009284U1 (en)

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CN106078388A (en) * 2016-06-22 2016-11-09 庄艳萍 A kind of wall polishing device
CA3098929A1 (en) * 2018-04-30 2019-11-07 Alfred Karcher Se & Co. Kg Ice-removal tool for an ice-removal machine, and hand-held ice-removal machine
CN108972259B (en) * 2018-07-02 2020-07-21 滨州学院 Civil engineering is with high accuracy equipment of polishing that can hand-carry
CN108942465B (en) * 2018-07-26 2020-06-12 合肥汇之新机械科技有限公司 Interior wall grinding device for building engineering
DE102018251715A1 (en) * 2018-12-27 2020-07-02 Robert Bosch Gmbh Hand tool
EP3812089A1 (en) 2019-10-23 2021-04-28 Black & Decker Inc. Pole sander
US11867224B2 (en) 2021-01-27 2024-01-09 Black & Decker Inc. Locking mechanism for two telescoping poles of a power tool
CN113696018A (en) * 2021-09-08 2021-11-26 李志武 Heat preservation outer wall basic unit repair system
CN115570460B (en) * 2022-10-28 2023-10-17 江苏大橡木集团有限公司 Wall surface grinding device for laboratory construction

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DE10316238A1 (en) * 2003-01-27 2004-08-05 Günther Böhler GmbH Motor driven handheld machining device for machining surface of workpiece, has driving unit which drives tool holding fixtures and second housing unit to rotate relative to first housing unit
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Also Published As

Publication number Publication date
DE202012009284U1 (en) 2014-01-22
EP2712705A3 (en) 2016-12-21
EP2712705A2 (en) 2014-04-02

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