EP3042738B1 - Long neck grinder with dust protection device - Google Patents

Long neck grinder with dust protection device Download PDF

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Publication number
EP3042738B1
EP3042738B1 EP15202098.8A EP15202098A EP3042738B1 EP 3042738 B1 EP3042738 B1 EP 3042738B1 EP 15202098 A EP15202098 A EP 15202098A EP 3042738 B1 EP3042738 B1 EP 3042738B1
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EP
European Patent Office
Prior art keywords
flange
recess
long
protective hood
grinding
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EP15202098.8A
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German (de)
French (fr)
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EP3042738A3 (en
EP3042738A2 (en
Inventor
Alexander Rohde
Oliver Nyber
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Metabowerke GmbH and Co
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Metabowerke GmbH and Co
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Publication of EP3042738A2 publication Critical patent/EP3042738A2/en
Publication of EP3042738A3 publication Critical patent/EP3042738A3/en
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    • 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
    • B24B7/186—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like with disc-type tools
    • 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 long-neck sander with a dust protection device.
  • Such long-neck grinders are usually used to work on walls, especially after filling work in dry construction or to prepare a wall painting after renovation work.
  • Typical long-neck grinders according to the prior art have a rotating or oscillating grinding wheel which is arranged in a head part of the grinder.
  • the head part is usually arranged on an elongated handle, along which a drive unit for driving the grinding wheel is usually attached - usually by means of a flexible shaft.
  • a dust protection device is usually implemented in the vicinity of the grinding wheel, by means of which a suction space that is largely closed off from the surroundings is formed.
  • the grinding dust is usually extracted from the extraction space by means of an additional extraction device such as a vacuum cleaner.
  • flaps are usually mechanically complex and prone to failure; furthermore, the opening and closing of the flaps (for Transition from grinding close to the edge to grinding away from the edge and vice versa) it is usually necessary to set the grinder down from the processed surface, which makes work even more difficult.
  • the present invention sets itself the task of creating a long-neck sander which enables the transition from grinding close to the edge to grinding away from the edge and vice versa in a mechanically robust and user-friendly manner.
  • the long-neck sander according to the invention has a drive unit for driving a rotatable or oscillatable grinding wheel, the grinding wheel being at least partially surrounded by a dust protection device.
  • the dust protection device has an at least partially encircling, in particular cylinder jacket-shaped, sealing flange for creating a suction space in the vicinity of the grinding wheel.
  • the sealing flange is provided with a recess in a certain circumferential section. The recess allows the grinding wheel to come closer to the edge when grinding close to the edge in order to be able to grind the processed surface as completely as possible.
  • the dust protection deposit is designed in two parts, the first part being formed by a protective hood.
  • the protective hood can in particular serve to cover the suction space in a direction vertical to the machined surface and can be designed essentially in the shape of a circular disk.
  • cylinder jacket-shaped - sealing flange in this way a pot-shaped space can be formed which, in cooperation with the machined surface, realizes a largely closed suction space.
  • the second part is formed by means of an adjustment flange that can be rotated with respect to the protective hood, the adjustment flange being rotated about an axis that is essentially vertical to the machined surface.
  • the sealing flange is arranged on the adjustment flange. In the case of a cylinder jacket-shaped design of the sealing flange, the rotation thus takes place in the circumferential direction of the dust protection device or the sealing flange.
  • the recess creates a connection between the suction space and the environment, so that the grinding wheel in this recess can maximally approach an adjacent surface and grinding close to the edge is possible.
  • the unwanted escape of grinding dust is avoided in that the recess is still covered by the adjacent wall and the grinding dust can be efficiently extracted from the suction space.
  • the recess In a second rotary position, the recess is covered so that a suction space that is largely closed off from the outside can be implemented when grinding away from the edge.
  • the recess is covered in the second rotational position, i.e. in the "grinding away from the edge" operating mode, in that an essentially ring segment-like sealing lip is arranged on the protective hood, which in the second rotational position overlaps the recess of the sealing flange and in particular covers it .
  • the sealing lip is arranged within the suction space and is able to cover the recess from the inside of the suction space in the second rotational position.
  • the protective hood can be connected to the adjustment flange in particular via a slide bearing.
  • the plain bearing can have two concentric, ring-shaped flanges be formed, of which the first connected to the protective hood and the second connected to the adjusting flange, in particular can be formed in one piece.
  • the two flanges can have similar or identical inner or outer radii and in particular can be arranged on top of one another.
  • the flanges can be held on top of one another by means of brackets. When twisted, the two flanges slide on one another in a rotational manner via their common axis of rotational symmetry.
  • the adjustment flange has a planar sliding section for sliding along, in particular on a wall or ceiling.
  • the sliding section is arranged in the area of the recess so that the grinding wheel can optimally reach the area of the surface to be machined close to the edge.
  • the planar sliding section can be used in an advantageous manner in order to cause the two parts of the dust protection device to rotate relative to one another when changing from one operating mode to the other.
  • the operator presses the dust protection device with the flat sliding section against the surface adjacent to the machined surface, that is to say, for example, when machining the ceiling, against the wall vertically adjoining underneath. Simply by turning the handle, the two parts of the dust protection device can be rotated in an ergonomically favorable manner without having to remove the grinder.
  • the flat sliding section shows a recess and is designed in such a way that the outer circumference of the grinding wheel approaches an adjacent room inner surface up to a distance of less than 10 mm, in particular less than 5 mm, complete processing of room inner surfaces by means of the Long-neck sander according to the invention are made possible.
  • locking elements can be provided to fix the protective hood and the adjustment flange against one another.
  • a locking element can be designed as a flat section on the adjustment flange; a latching element corresponding to this can also be designed as a flat section on a sealing lip. By placing both flat surfaces against one another, anti-twist protection can be implemented.
  • a locking element can be designed as a ring segment-like rib on the adjusting flange; a further latching element is in this case designed as a recess on the protective hood that corresponds to the ring segment-like rib.
  • a reverse arrangement is of course also possible.
  • Figure 1 is a schematic representation of a head part of a long-neck sander according to the invention.
  • the long-neck sander has a fork 1 into which a handle (not shown here) can usually be inserted.
  • the fork 1 is mounted on a swivel flange 3 so that it can be swiveled about an axis A, so that an ergonomically favorable angle can be set between the handle and the surface to be processed, depending on the respective work situation.
  • the swivel flange is in turn mounted pivotably about a longitudinal axis B by means of the bearing bracket 7 arranged on a protective hood 4, which results in a further possibility of enabling ergonomically favorable conditions when machining surfaces with a wide variety of orientations.
  • the swivel flange 3 has an opening 2 through which a flexible shaft, likewise not shown in the figure, for driving a sanding plate can pass in a manner known per se.
  • the flexible shaft is still guided in the hollow handle in the direction of a drive unit;
  • the hollow handle can also serve to enable dust extraction in a manner which is also known per se.
  • a vacuum cleaner for example, can be connected to the end of the handle facing away from the head part.
  • the dust protection device itself is designed in two parts using the protective hood 4 already described above and an outer adjustment flange 6.
  • the adjustment flange 6 is designed to be rotatable in the circumferential direction with respect to the protective hood 4 by means of a slide bearing.
  • an outer flange 41 of the protective hood 4 is provided with an in Figure 1 Not visible inner flange of the adjustment flange 6 is brought into congruence and held on this rotatably in the circumferential direction by means of holding brackets 5.
  • the adjustment flange 6 also has a planar sliding section 61 for sliding along, in particular on a wall or ceiling in the area of an inner edge of a room, the sliding section 61 being provided with an edge protection 62 which allows the head part to slide gently on the corresponding room edge enables.
  • the head part of the long-neck sander according to the invention is designed in such a way that the closest possible approach of a sanding plate to the corresponding edge is ensured in order to enable the respective surface to be processed as completely as possible. For this, reference is made to the following figures.
  • the planar design of the sliding section 61 essentially achieves two effects: On the one hand, it prevents the head part from applying too much pressure locally to the corresponding room edge, which could damage the neighboring surface, which may have already been finished.
  • the flat sliding section 61 can advantageously be used as a contact surface when the adjusting flange 6 is rotated relative to the protective hood 4, in particular when changing from grinding close to the edge to grinding away from the edge.
  • the user brings the flat sliding section 61 into contact with the neighboring surface, which is usually perpendicular to the surface being worked on, and uses this as an abutment when the adjusting flange 6 is rotated with respect to the protective hood 4. It is particularly advantageous that In contrast to the prior art, the user does not have to put down the long-neck sander in order to switch from one operating mode to the other. This enables ergonomic and, moreover, efficient work.
  • Figure 2 shows a further perspective view of a head part of a long-neck sander according to the invention from the side facing the surface to be sanded in the "sanding close to the edge" operating mode.
  • a foam pad 81 which is arranged on the only partially visible sanding plate 8, can be clearly seen here.
  • the foam pad 81 is designed in such a way that it can accommodate exchangeable grinding disks arranged thereon, for example by means of a Velcro fastener.
  • FIG. 2 Well recognizable in Figure 2 is a sealing flange designed as a circumferential brush ring 10, which is arranged on the adjustment flange 6 and to create a The suction chamber is largely sealed off from the environment.
  • the brush ring 10 has the recess 101 through which the foam pad 81 partially passes.
  • the recess 101 in the brush ring corresponds to a recess 613 in the planar sliding section 61.
  • the planar sliding section 61 is designed in such a way that the outer circumference of the foam pad 81 with a grinding wheel placed thereon comes in close proximity to that plane which passes through the Sanding plate facing away from the edge protection 62 is formed.
  • the grinding wheel arranged on the foam pad also reaches the outermost edge areas of room walls, that is to say those areas in which one wall meets another wall or the ceiling.
  • the suction space is formed by the interaction of the brush ring 10 with the adjoining wall or ceiling of the space, through which the recess 613 in the sliding section 61 is covered.
  • the sealing lip 11 arranged on the protective hood 4 which is not visible in the figure, can be seen. In the operating position shown, it is not required to seal off the suction space from the outside.
  • the sealing lip 11 is in the position opposite the recess 613 of the sliding section 61, that is to say in the "grinding close to the edge" operating mode. In this position, sanding work can be carried out along an edge, as close as possible to a wall.
  • Figure 4 shows a first possibility for locking the protective hood 4 and the adjustment flange 6 against one another in the "grinding away from the edge" operating mode. This is done on the in the upper part of the Figure 4 A flat section 111 is arranged, which in the said operating mode comes to rest against a corresponding flat section 64 of the adjustment flange 6 and, in combination with a formation of the sealing lip 11 made of an elastic material and its fixed connection with the protective hood 4, inhibits the protective hood 4 and the adjustment flange 6 guaranteed against twisting against each other.
  • the sealing lip can in particular be made from a silicone or another abrasion-resistant elastomer.
  • Figure 5 shows a further variant of a possible latching of protective hood 4 and adjusting flange 6 against one another.
  • the adjustment flange 6 is provided with a ring segment-like rib 65 in the example shown, which corresponds to a correspondingly shaped recess 45 in the protective hood 4.
  • the two elements mentioned are in engagement with each other and thus prevent unwanted rotation of the adjustment flange 6 relative to the protective cover 4.
  • the protective cover can also be provided with a recess and the adjustment flange with a corresponding rib.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Die Erfindung betrifft einen Langhalsschleifer mit einer Staubschutzeinrichtung. Derartige Langhalsschleifer werden üblicherweise zur Bearbeitung von Wänden insbesondere nach Spachtelarbeiten im Trockenbau oder zur Vorbereitung eines Wandanstriches nach Renovierungsarbeiten verwendet. Typische Langhalsschleifer nach dem Stand der Technik weisen eine rotier- oder oszillierbare Schleifscheibe auf, welche in einem Kopfteil des Schleifers angeordnet ist. Das Kopfteil ist in der Regel auf einem langestreckten Handgriff angeordnet, entlang dessen üblicherweise eine Antriebseinheit zum Antrieb der Schleifscheibe - meist mittels einer flexiblen Welle - angebracht ist. Um den Bediener und auch die Umgebung vor dem Austreten von Schleifstaub zu schützen, wird in der Umgebung der Schleifscheibe meist eine Staubschutzeinrichtung realisiert, durch welche ein gegenüber der Umgebung weitgehend abgeschlossener Absaugraum gebildet wird. Der Schleifstaub wird üblicherweise aus dem Absaugraum mittels einer zusätzlichen Absaugeinrichtung wie beispielsweise einen Staubsauger abgesaugt.The invention relates to a long-neck sander with a dust protection device. Such long-neck grinders are usually used to work on walls, especially after filling work in dry construction or to prepare a wall painting after renovation work. Typical long-neck grinders according to the prior art have a rotating or oscillating grinding wheel which is arranged in a head part of the grinder. The head part is usually arranged on an elongated handle, along which a drive unit for driving the grinding wheel is usually attached - usually by means of a flexible shaft. In order to protect the operator and the surroundings from the escape of grinding dust, a dust protection device is usually implemented in the vicinity of the grinding wheel, by means of which a suction space that is largely closed off from the surroundings is formed. The grinding dust is usually extracted from the extraction space by means of an additional extraction device such as a vacuum cleaner.

Eine besondere Herausforderung besteht jedoch in der Betriebsart "randnahes Schleifen" des Langhalsschleifers. In diesem Fall ist es erforderlich, die Schleifscheibe so weit wie möglich an eine angrenzende, üblicherweise zur bearbeiteten Fläche vertikal stehende weitere Fläche anzunähern. Diese Situation tritt üblicherweise bei der Bearbeitung von Randbereichen von Raumdecken oder auch bei der Bearbeitung von Wänden im Bereich von Zimmerecken auf. In diesem Fall würde ohne weitere Modifikation durch die Staubschutzeinrichtung eine angemessene Bearbeitung der beschriebenen Randbereiche erschwert beziehungsweise gänzlich verhindert. Der Stand der Technik enthält verschiedenste Ansätze zur Lösung dieses Problems. So wird beispielsweise vorgeschlagen, mittels öffenbarer Klappen einer Bereich zu schaffen, in welchem sich die Schleifscheibe maximal an eine angrenzende Fläche annähern kann. Derartige Klappen sind jedoch üblicherweise mechanisch aufwendig ausgeführt und störanfällig; ferner wird zum Öffnen und Schließen der Klappen (beim Übergang von randnahem Schleifen zu randfernen Schleifen und umgekehrt) üblicherweise ein Absetzen des Schleifers von der bearbeiteten Fläche erforderlich, was das Arbeiten zusätzlich erschwert. Eine Schleifmaschine, die dem Oberbegriff von Anspruch 1 zugrunde gelegt wurde, in aus DE102012111985 bekannt.However, there is a particular challenge in the "grinding close to the edge" operating mode of the long-neck sander. In this case it is necessary to bring the grinding wheel as close as possible to an adjoining further surface which is usually vertical to the surface being processed. This situation usually occurs when working on edge areas of room ceilings or when working on walls in the area of room corners. In this case, without further modification by the dust protection device, adequate processing of the described edge areas would be made difficult or even prevented entirely. The prior art contains a wide variety of approaches to solving this problem. For example, it is proposed to use openable flaps to create an area in which the grinding wheel can maximally approach an adjacent surface. However, such flaps are usually mechanically complex and prone to failure; furthermore, the opening and closing of the flaps (for Transition from grinding close to the edge to grinding away from the edge and vice versa) it is usually necessary to set the grinder down from the processed surface, which makes work even more difficult. A grinding machine on which the preamble of claim 1 was based, in from DE102012111985 known.

Hiervon ausgehend stellt sich die vorliegende Erfindung die Aufgabe, einen Langhalsschleifer zu schaffen, welcher auf mechanisch robuste und bedienerfreundliche Weise den Übergang von randnahem zu randfernem Schleifen und umgekehrt ermöglicht.Based on this, the present invention sets itself the task of creating a long-neck sander which enables the transition from grinding close to the edge to grinding away from the edge and vice versa in a mechanically robust and user-friendly manner.

Diese Aufgabe wird durch den Langhalsschleifer mit den im unabhängigen Anspruch 1 aufgeführten Merkmalen gelöst. Die Unteransprüche betreffen vorteilhafte Varianten und Ausführungsformen der Erfindung.This object is achieved by the long-neck sander with the features listed in independent claim 1. The subclaims relate to advantageous variants and embodiments of the invention.

Der erfindungsgemäße Langhalsschleifer weist eine Antriebseinheit zum Antrieb einer rotier- oder oszillierbaren Schleifscheibe auf, wobei die Schleifscheibe mindestens teilweise von einer Staubschutzeinrichtung umgeben ist. Die Staubschutzeinrichtung weist dabei einen mindestens teilweise umlaufenden, insbesondere zylindermantelförmigen Dichtflansch zur Schaffung eines Absaugraumes in der Umgebung der Schleifscheibe auf. Um ein randnahes Schleifen zu ermöglichen, ist der Dichtflansch in einem bestimmten Umfangsabschnitt mit einer Ausnehmung versehen. Die Ausnehmung ermöglicht dabei eine maximale Annäherung der Schleifscheibe bei einem randnahen Schleifen, um die bearbeitete Fläche möglichst vollständig schleifen zu können.The long-neck sander according to the invention has a drive unit for driving a rotatable or oscillatable grinding wheel, the grinding wheel being at least partially surrounded by a dust protection device. The dust protection device has an at least partially encircling, in particular cylinder jacket-shaped, sealing flange for creating a suction space in the vicinity of the grinding wheel. In order to enable grinding close to the edge, the sealing flange is provided with a recess in a certain circumferential section. The recess allows the grinding wheel to come closer to the edge when grinding close to the edge in order to be able to grind the processed surface as completely as possible.

Erfindungsgemäß ist die Staubschutzeinreichung zweiteilig ausgebildet, wobei der erste Teil durch eine Schutzhaube gebildet ist. Die Schutzhaube kann dabei insbesondere zur Abdeckung des Absaugraumes in einer zur bearbeiteten Fläche vertikalen Richtung dienen und im Wesentlichen kreisscheibenförmig ausgebildet sein. In Kombination mit dem - gegebenenfalls zylindermantelförmigen - Dichtflansch kann so ein topfförmiger Raum gebildet werden, welcher in Zusammenwirken mit der bearbeiteten Fläche einen weitgehend abgeschlossenen Absaugraum realisiert.According to the invention, the dust protection deposit is designed in two parts, the first part being formed by a protective hood. The protective hood can in particular serve to cover the suction space in a direction vertical to the machined surface and can be designed essentially in the shape of a circular disk. In combination with the - if necessary, cylinder jacket-shaped - sealing flange in this way a pot-shaped space can be formed which, in cooperation with the machined surface, realizes a largely closed suction space.

Der zweite Teil ist erfindungsgemäß mittels eines gegenüber der Schutzhaube verdrehbaren Verstellflansches gebildet, wobei die Verdrehung des Verstellflansches um eine im Wesentlichen zur bearbeiteten Fläche vertikale Achse erfolgt. Der Dichtflansch ist dabei auf dem Verstellflansch angeordnet. Im Falle einer zylindermantelförmigen Ausbildung des Dichtflansches erfolgt die Verdrehung also in Umfangsrichtung der Staubschutzeinrichtung bzw. des Dichtflansches.According to the invention, the second part is formed by means of an adjustment flange that can be rotated with respect to the protective hood, the adjustment flange being rotated about an axis that is essentially vertical to the machined surface. The sealing flange is arranged on the adjustment flange. In the case of a cylinder jacket-shaped design of the sealing flange, the rotation thus takes place in the circumferential direction of the dust protection device or the sealing flange.

In einer ersten Drehstellung wird durch die Ausnehmung eine Verbindung des Absaugraumes zur Umgebung geschaffen, so dass sich die Schleifscheibe in dieser Ausnehmung maximal an eine benachbarte Fläche annähern kann und ein randnahes Schleifen möglich ist. In diesem Fall wird das ungewollte Austreten von Schleifstaub dadurch vermieden, dass die Ausnehmung durch die benachbarte Wand nach wie vor abgedeckt wird und der Schleifstaub aus dem Absaugraum effizient abgesaugt werden kann.In a first rotary position, the recess creates a connection between the suction space and the environment, so that the grinding wheel in this recess can maximally approach an adjacent surface and grinding close to the edge is possible. In this case, the unwanted escape of grinding dust is avoided in that the recess is still covered by the adjacent wall and the grinding dust can be efficiently extracted from the suction space.

In einer zweiten Drehstellung ist die Ausnehmung abgedeckt, so dass bei randfernem Schleifen ein nach außen weitgehend abgeschlossener Absaugraum realisiert werden kann.In a second rotary position, the recess is covered so that a suction space that is largely closed off from the outside can be implemented when grinding away from the edge.

Die Abdeckung der Ausnehmung in der zweiten Drehstellung, also in der Betriebsart "randfernes Schleifen" wird dadurch erreicht, dass auf der Schutzhaube eine im wesentlichen ringsegmentartige Dichtlippe angeordnet ist, die in der zweiten Drehstellung zur Überlappung mit der Ausnehmung des Dichtflansches gelangt und insbesondere diese abdeckt.The recess is covered in the second rotational position, i.e. in the "grinding away from the edge" operating mode, in that an essentially ring segment-like sealing lip is arranged on the protective hood, which in the second rotational position overlaps the recess of the sealing flange and in particular covers it .

Erfindungsgemäß ist die Dichtlippe innerhalb des Absaugraumes angeordnet und vermag in der zweiten Drehstellung die Ausnehmung von der Innenseite des Absaugraumes abzudecken.According to the invention, the sealing lip is arranged within the suction space and is able to cover the recess from the inside of the suction space in the second rotational position.

Die Schutzhaube kann mit dem Verstellflansch insbesondere über ein Gleitlager verbunden sein. Das Gleitlager kann dabei über zwei konzentrische, ringförmige Flansche gebildet sein, von welchen der erste mit der Schutzhaube und der zweite mit dem Verstellflansch verbunden, insbesondere einteilig ausgebildet sein kann. Die beiden Flansche können ähnliche bzw. identische Innen- bzw. Außenradien aufweisen und insbesondere aufeinander angeordnet sein. Durch Haltewinkel können die Flansche aufeinander gehalten werden. Bei einem Verdrehen gleiten die beiden Flansche aufeinander rotatorisch über ihre gemeinsame Rotationssymmetrieachse.The protective hood can be connected to the adjustment flange in particular via a slide bearing. The plain bearing can have two concentric, ring-shaped flanges be formed, of which the first connected to the protective hood and the second connected to the adjusting flange, in particular can be formed in one piece. The two flanges can have similar or identical inner or outer radii and in particular can be arranged on top of one another. The flanges can be held on top of one another by means of brackets. When twisted, the two flanges slide on one another in a rotational manner via their common axis of rotational symmetry.

In einer vorteilhaften Ausführungsform der Erfindung zeigt der Verstellflansch einen eben ausgebildeten Gleitabschnitt zum Entlanggleiten insbesondere an einer Wand oder Decke. Dabei ist der Gleitabschnitt im Bereich der Ausnehmung angeordnet, so dass die Schleifscheibe den randnahen Bereich der zu bearbeitenden Fläche in optimaler Weise erreichen kann. Weiterhin kann der ebene Gleitabschnitt in vorteilhafter Weise genutzt werden, um eine Verdrehung der beiden Teile der Staubschutzvorrichtung gegeneinander beim Wechsel von einer Betriebsart zur anderen zu bewirken. Der Bediener drückt hierzu die Staubschutzvorrichtung mit dem ebenen Gleitabschnitt an die der bearbeiteten Fläche benachbarte Fläche, also beispielsweise beim Bearbeiten der Decke an die sich darunter vertikal anschließende Wand. Allein durch eine Drehung am Griff kann so eine Verdrehung der beiden Teile der Staubschutzvorrichtung ohne Absetzen des Schleifers auf ergonomisch günstige Weise erreicht werden.In an advantageous embodiment of the invention, the adjustment flange has a planar sliding section for sliding along, in particular on a wall or ceiling. The sliding section is arranged in the area of the recess so that the grinding wheel can optimally reach the area of the surface to be machined close to the edge. Furthermore, the planar sliding section can be used in an advantageous manner in order to cause the two parts of the dust protection device to rotate relative to one another when changing from one operating mode to the other. For this purpose, the operator presses the dust protection device with the flat sliding section against the surface adjacent to the machined surface, that is to say, for example, when machining the ceiling, against the wall vertically adjoining underneath. Simply by turning the handle, the two parts of the dust protection device can be rotated in an ergonomically favorable manner without having to remove the grinder.

Dadurch, dass der ebene Gleitabschnitt eine Ausnehmung zeigt und derart ausgeführt ist, dass sich der Außenumfang der Schleifscheibe bis zu einem Abstand von weniger als 10 mm, insbesondere von weniger als 5 mm an eine angrenzende Rauminnenfläche annähert, kann ein vollständiges Bearbeiten von Rauminnenflächen mittels des erfindungsgemäßen Langhalsschleifers ermöglicht werden.Due to the fact that the flat sliding section shows a recess and is designed in such a way that the outer circumference of the grinding wheel approaches an adjacent room inner surface up to a distance of less than 10 mm, in particular less than 5 mm, complete processing of room inner surfaces by means of the Long-neck sander according to the invention are made possible.

Zur Fixierung von Schutzhaube und Verstellflansch gegeneinander können in einer vorteilhaften Varianter der Erfindung Rastelemente vorhanden sein.In an advantageous variant of the invention, locking elements can be provided to fix the protective hood and the adjustment flange against one another.

Dabei kann ein Rastelement als ebener Abschnitt auf dem Verstellflansch ausgebildet sein; ein hierzu korrespondierendes Rastelement kann ebenfalls als ebener Abschnitt auf einer Dichtlippe ausgebildet sein. Durch die Anlage beider ebener Flächen aneinander kann so eine Verdrehsicherung realisiert werden.A locking element can be designed as a flat section on the adjustment flange; a latching element corresponding to this can also be designed as a flat section on a sealing lip. By placing both flat surfaces against one another, anti-twist protection can be implemented.

Zusätzlich oder alternativ kann ein Rastelement als ringsegmentartige Rippe auf dem Verstellflansch ausgebildet sein; ein weiteres Rastelement ist in diesem Fall als eine der ringsegmentartigen Rippe korrespondierende Ausnehmung auf der Schutzhaube ausgebildet. Selbstverständlich ist auch eine umgekehrte Anordnung möglich.Additionally or alternatively, a locking element can be designed as a ring segment-like rib on the adjusting flange; a further latching element is in this case designed as a recess on the protective hood that corresponds to the ring segment-like rib. A reverse arrangement is of course also possible.

Nachfolgend wird eine exemplarische Ausführungsform der Erfindung anhand der Zeichnung näher erläutert.An exemplary embodiment of the invention is explained in more detail below with reference to the drawing.

Es zeigt:

Figur 1
eine schematische Darstellung eines Ausführungsbeispiels eines Kopfteiles eines erfindungsgemäßen Langhalsschleifers,
Figur 2
eine weitere perspektivische Ansicht eines Kopfteiles eines erfindungsgemäßen Langhalsschleifers von der der zu schleifenden Oberfläche zugewandten Seite her,
Figur 3
in den Teilfiguren 3a und 3b eine Darstellung der beiden Betriebsarten "randnahes Schleifen" und "randfernes Schleifen",
Figur 4
eine erste Möglichkeit zum Verrasten von Schutzhaube und Verstellflansch; und
Figur 5
eine weitere Möglichkeit zum Verrasten von Schutzhaube und Verstellflansch.
It shows:
Figure 1
a schematic representation of an embodiment of a head part of a long-neck sander according to the invention,
Figure 2
a further perspective view of a head part of a long-neck sander according to the invention from the side facing the surface to be sanded,
Figure 3
in the sub-figures 3a and 3b a representation of the two operating modes "grinding close to the edge" and "grinding away from the edge",
Figure 4
a first possibility for locking the protective hood and adjustment flange; and
Figure 5
Another possibility for locking the protective hood and adjustment flange.

In Figur 1 ist eine schematische Darstellung eines Kopfteiles eines erfindungsgemäßen Langhalsschleifers gezeigt. In vorliegendem Beispiel weist der Langhalsschleifer eine Gabel 1 auf, in welche üblicherweise ein Griff (hier nicht dargestellt) eingesetzt werden kann. Die Gabel 1 ist an einem Schwenkflansch 3 um eine Achse A verschwenkbar gelagert, so dass abhängig von der jeweiligen Arbeitssituation ein ergonomisch günstiger Winkel zwischen dem Griff und der zu bearbeitenden Fläche eingestellt werden kann. Weiterhin ist der Schwenkflansch seinerseits mittels der auf einer Schutzhaube 4 angeordneten Lagerbügel 7 um eine Längsachse B schwenkbar gelagert, wodurch sich eine weitere Möglichkeit ergibt, ergonomisch günstige Verhältnisse beim Bearbeiten unterschiedlichst ausgerichteter Flächen zu ermöglichen. Ferner weist der Schwenkflansch 3 eine Öffnung 2 auf, durch welche eine in der Figur ebenfalls nicht dargestellte biegsame Welle zum Antrieb eines Schleiftellers in an sich bekannter Weise hindurchtreten kann. Die biegsame Welle ist weiterhin in dem hohlen Griff in Richtung einer Antriebseinheit geführt; ferner kann der hohle Griff auch dazu dienen, in ebenfalls an sich bekannter Weise eine Staubabsaugung zu ermöglichen. Hierzu kann an das dem Kopfteil abgewandte Ende des Griffes beispielsweise ein Staubsauger angeschlossen werden.In Figure 1 is a schematic representation of a head part of a long-neck sander according to the invention. In the present example, the long-neck sander has a fork 1 into which a handle (not shown here) can usually be inserted. The fork 1 is mounted on a swivel flange 3 so that it can be swiveled about an axis A, so that an ergonomically favorable angle can be set between the handle and the surface to be processed, depending on the respective work situation. Furthermore, the swivel flange is in turn mounted pivotably about a longitudinal axis B by means of the bearing bracket 7 arranged on a protective hood 4, which results in a further possibility of enabling ergonomically favorable conditions when machining surfaces with a wide variety of orientations. Furthermore, the swivel flange 3 has an opening 2 through which a flexible shaft, likewise not shown in the figure, for driving a sanding plate can pass in a manner known per se. The flexible shaft is still guided in the hollow handle in the direction of a drive unit; Furthermore, the hollow handle can also serve to enable dust extraction in a manner which is also known per se. For this purpose, a vacuum cleaner, for example, can be connected to the end of the handle facing away from the head part.

Im gezeigten Beispiel ist die Staubschutzeinrichtung selbst zweiteilig unter Verwendung der bereits oben beschriebenen Schutzhaube 4 und eines äußeren Verstellflansches 6 ausgebildet. Dabei ist der Verstellflansch 6 gegenüber der Schutzhaube 4 in Umfangsrichtung mittels eines Gleitlagers drehbar ausgebildet. Hierzu wird ein Außenflansch 41 der Schutzhaube 4 mit einem in Figur 1 nicht sichtbaren Innenflansch des Verstellflansches 6 zur Deckung gebracht und auf diesem in Umfangsrichtung drehbar mittels Haltewinkeln 5 gehalten.In the example shown, the dust protection device itself is designed in two parts using the protective hood 4 already described above and an outer adjustment flange 6. The adjustment flange 6 is designed to be rotatable in the circumferential direction with respect to the protective hood 4 by means of a slide bearing. For this purpose, an outer flange 41 of the protective hood 4 is provided with an in Figure 1 Not visible inner flange of the adjustment flange 6 is brought into congruence and held on this rotatably in the circumferential direction by means of holding brackets 5.

Der Verstellflansch 6 weist weiterhin einen eben ausgebildeten Gleitabschnitt 61 zum Entlanggleiten insbesondere an einer Wand oder Decke im Bereich einer Innenkante eines Raumes auf, wobei der Gleitabschnitt 61 mit einem Kantenschutz 62 versehen ist, welcher ein schonendes Abgleiten des Kopfteiles an der entsprechenden Raumkante ermöglicht. Der Kopfteil des erfindungsgemäßen Langhalsschleifers ist dabei in der Weise ausgebildet, dass ein möglichst dichtes Annähern eines Schleiftellers an die entsprechende Kante gewährleistet wird, um eine möglichst vollständige Bearbeitung der jeweiligen Fläche zu ermöglichen. Hierzu wird auf die nachfolgenden Figuren verwiesen. Durch die ebene Ausbildung des Gleitabschnittes 61 werden im Wesentlichen zwei Effekte erreicht: Einerseits wird vermieden, dass lokal ein zu großer Anpressdruck des Kopfteiles an die entsprechende Raumkante entsteht, was zu Beschädigungen der gegebenenfalls bereits endbearbeiteten Nachbarfläche führen könnte. Andererseits kann der ebene Gleitabschnitt 61 in vorteilhafter Weise als Anlagefläche bei einem Verdrehen des Verstellflansches 6 gegenüber der Schutzhaube 4 insbesondere bei einem Wechsel von randnahem zu randfernem Schleifen verwendet werden. Hierzu bringt der Benutzer während der Betriebsart "randnahes Schleifen" den ebenen Gleitabschnitt 61 in Anlage mit der benachbarten, üblicherweise zur aktuell bearbeiteten Fläche senkrechten Nachbarfläche und verwendet diese als Widerlager bei einer Verdrehung des Verstellflansches 6 gegenüber der Schutzhaube 4. Besonders vorteilhaft ist dabei, dass der Benutzer im Unterschied zum Stand der Technik den Langhalsschleifer nicht absetzen muss, um von einer Betriebsart in die andere überzugehen. Auf diese Weise wird ein ergonomisches und darüber hinaus effizientes Arbeiten ermöglicht.The adjustment flange 6 also has a planar sliding section 61 for sliding along, in particular on a wall or ceiling in the area of an inner edge of a room, the sliding section 61 being provided with an edge protection 62 which allows the head part to slide gently on the corresponding room edge enables. The head part of the long-neck sander according to the invention is designed in such a way that the closest possible approach of a sanding plate to the corresponding edge is ensured in order to enable the respective surface to be processed as completely as possible. For this, reference is made to the following figures. The planar design of the sliding section 61 essentially achieves two effects: On the one hand, it prevents the head part from applying too much pressure locally to the corresponding room edge, which could damage the neighboring surface, which may have already been finished. On the other hand, the flat sliding section 61 can advantageously be used as a contact surface when the adjusting flange 6 is rotated relative to the protective hood 4, in particular when changing from grinding close to the edge to grinding away from the edge. For this purpose, during the "grinding close to the edge" operating mode, the user brings the flat sliding section 61 into contact with the neighboring surface, which is usually perpendicular to the surface being worked on, and uses this as an abutment when the adjusting flange 6 is rotated with respect to the protective hood 4. It is particularly advantageous that In contrast to the prior art, the user does not have to put down the long-neck sander in order to switch from one operating mode to the other. This enables ergonomic and, moreover, efficient work.

Figur 2 zeigt eine weitere perspektivische Ansicht eines Kopfteiles eines erfindungsgemäßen Langhalsschleifers von der der zu schleifenden Oberfläche zugewandten Seite her in der Betriebsart "randnahes Schleifen". Gut erkennbar ist hier ein Schaumstoffpad 81, welches auf dem nur teilweise sichtbaren Schleifteller 8 angeordnet ist. Das Schaumstoffpad 81 ist dabei in der Weise ausgebildet, dass es beispielsweise mittels eines Klettverschlusses darauf angeordnete wechselbare Schleifscheiben aufnehmen kann. Figure 2 shows a further perspective view of a head part of a long-neck sander according to the invention from the side facing the surface to be sanded in the "sanding close to the edge" operating mode. A foam pad 81, which is arranged on the only partially visible sanding plate 8, can be clearly seen here. The foam pad 81 is designed in such a way that it can accommodate exchangeable grinding disks arranged thereon, for example by means of a Velcro fastener.

Gut erkennbar in Figur 2 ist ein als umlaufender Bürstenring 10 ausgebildeter Dichtflansch, welcher auf dem Verstellflansch 6 angeordnet ist und zur Schaffung eines gegenüber der Umgebung weitgehend abgedichteten Absaugraumes dient. Der Bürstenring 10 weist jedoch, um ein randnahes Schleifen zu ermöglichen, die Ausnehmung 101 auf, durch welche das Schaumstoffpad 81 teilweise hindurchtritt. In der gezeigten Betriebsart korrespondiert der Ausnehmung 101 im Bürstenring mit einer Ausnehmung 613 im ebenen Gleitabschnitt 61. Dabei ist der ebene Gleitabschnitt 61 derart ausgeführt, dass der Außenumfang des Schaumstoffpads 81 mit einer darauf angeordneten Schleifscheibe in unmittelbare Nähe derjenigen Ebene gelangt, welche durch die dem Schleifteller abgewandte Seite des Kantenschutzes 62 gebildet wird. Mit anderen Worten erreicht die auf dem Schaumstoffpad angeordnete Schleifscheibe auch die äußersten Randbereiche von Raumwänden, also diejenigen Bereiche, in welchen eine Wand auf eine andere Wand oder die Raumdecke trifft. In der hier gezeigten Betriebsstellung "randnahes Arbeiten" wird der Absaugraum durch das Zusammenwirken des Bürstenringes 10 mit der angrenzenden Wand bzw. Decke des Raumes gebildet, durch welche die Ausnehmung 613 im Gleitabschnitt 61 abgedeckt wird.Well recognizable in Figure 2 is a sealing flange designed as a circumferential brush ring 10, which is arranged on the adjustment flange 6 and to create a The suction chamber is largely sealed off from the environment. However, in order to allow grinding close to the edge, the brush ring 10 has the recess 101 through which the foam pad 81 partially passes. In the mode of operation shown, the recess 101 in the brush ring corresponds to a recess 613 in the planar sliding section 61. The planar sliding section 61 is designed in such a way that the outer circumference of the foam pad 81 with a grinding wheel placed thereon comes in close proximity to that plane which passes through the Sanding plate facing away from the edge protection 62 is formed. In other words, the grinding wheel arranged on the foam pad also reaches the outermost edge areas of room walls, that is to say those areas in which one wall meets another wall or the ceiling. In the operating position "working close to the edge" shown here, the suction space is formed by the interaction of the brush ring 10 with the adjoining wall or ceiling of the space, through which the recess 613 in the sliding section 61 is covered.

Auf der dem Gleitabschnitt 61 abgewandten Seite des Kopfteiles ist die auf der in der Figur nicht sichtbaren Schutzhaube 4 angeordnete Dichtlippe 11 zu erkennen. In der gezeigten Betriebsstellung wird sie zur Abdichtung des Absaugraumes nach außen nicht benötigt.On the side of the head part facing away from the sliding section 61, the sealing lip 11 arranged on the protective hood 4, which is not visible in the figure, can be seen. In the operating position shown, it is not required to seal off the suction space from the outside.

Die Funktion der Dichtlippe 11 in Zusammenwirken mit dem Verstellflansch 6 wird anhand der nachfolgenden Figuren 3a und 3b verdeutlicht, in welchen zur Verbesserung der Übersicht lediglich Verstellflansch 6 und Schutzhaube 4 mit den darauf unmittelbar angeordneten Teilen dargestellt sind.The function of the sealing lip 11 in cooperation with the adjusting flange 6 is illustrated by the following Figures 3a and 3b illustrates in which, to improve the overview, only the adjusting flange 6 and protective hood 4 with the parts directly arranged thereon are shown.

In der Figur 3a befindet sich die Dichtlippe 11 in der der Aussparung 613 des Gleitabschnittes 61 gegenüberliegenden Position, also in der Betriebsart "randnahes Schleifen". In dieser Position sind Schleifarbeiten entlang einer Kante, möglichst nah an einer Wand durchführbar.In the Figure 3a the sealing lip 11 is in the position opposite the recess 613 of the sliding section 61, that is to say in the "grinding close to the edge" operating mode. In this position, sanding work can be carried out along an edge, as close as possible to a wall.

Im Unterschied hierzu ist in der Figur 3b die Betriebsart "randfernes Schleifen" dargestellt. Gegenüber der Darstellung in Figur 3a sind Verstellflansch 6 und Schutzhaube 4 um 180° verdreht. In dieser Stellung dichtet die Dichtlippe 11 den Absaugraum nach außen ab und verhindert das Austreten von Schleifstaub in den Außenraum.In contrast to this, the Figure 3b the operating mode "grinding away from the edge" is shown. Compared to the representation in Figure 3a adjustment flange 6 and protective hood 4 are rotated by 180 °. In this position, the sealing lip 11 seals the suction space from the outside and prevents grinding dust from escaping into the outside space.

Figur 4 zeigt eine erste Möglichkeit zum Verrasten von Schutzhaube 4 und Verstellflansch 6 gegeneinander in der Betriebsart "randfernes Schleifen". Hierzu ist an der im oberen Teil der Figur 4 dargestellten Dichtlippe ein ebener Abschnitt 111 angeordnet, welcher in der genannten Betriebsart an einen korrespondierenden ebenen Abschnitt 64 des Verstellflansches 6 zur Anlage kommt und in Kombination mit einer Ausbildung der Dichtlippe 11 aus einem elastischen Material und ihrer festen Verbindung mit der Schutzhaube 4 eine Hemmung der Schutzhaube 4 und des Verstellflansches 6 gegenüber einem Verdrehen gegen einander gewährleistet. Figure 4 shows a first possibility for locking the protective hood 4 and the adjustment flange 6 against one another in the "grinding away from the edge" operating mode. This is done on the in the upper part of the Figure 4 A flat section 111 is arranged, which in the said operating mode comes to rest against a corresponding flat section 64 of the adjustment flange 6 and, in combination with a formation of the sealing lip 11 made of an elastic material and its fixed connection with the protective hood 4, inhibits the protective hood 4 and the adjustment flange 6 guaranteed against twisting against each other.

Die Dichtlippe kann insbesondere aus einem Silikon oder einem anderen abriebfesten Elastomer hergestellt sein.The sealing lip can in particular be made from a silicone or another abrasion-resistant elastomer.

Figur 5 zeigt eine weitere Variante einer möglichen Verrastung von Schutzhaube 4 und Verstellflansch 6 gegen einander. In dieser - zu der in Figur 4 gezeigten Anordnung zusätzlichen oder alternativen - Variante ist der Verstellflansch 6 mit einer im gezeigten Beispiel ringsegmentartigen Rippe 65 versehen, welcher eine entsprechend geformte Ausnehmung 45 in der Schutzhaube 4 korrespondiert. In der Betriebsart "randfernes Schleifen" stehen die beiden genannten Elemente mit einander in Eingriff und verhindern so ein ungewolltes Verdrehen des Verstellflansches 6 gegenüber der Schutzhabe 4. Selbstverständlich kann auch die Schutzhaube mit einer Ausnehmung und der Verstellflansch mit einer entsprechenden Rippe versehen sein. Figure 5 shows a further variant of a possible latching of protective hood 4 and adjusting flange 6 against one another. In this - to the in Figure 4 The arrangement shown, additional or alternative variant, the adjustment flange 6 is provided with a ring segment-like rib 65 in the example shown, which corresponds to a correspondingly shaped recess 45 in the protective hood 4. In the "grinding away from the edge" operating mode, the two elements mentioned are in engagement with each other and thus prevent unwanted rotation of the adjustment flange 6 relative to the protective cover 4. Of course, the protective cover can also be provided with a recess and the adjustment flange with a corresponding rib.

Claims (8)

  1. A long-neck sander with a drive unit for driving a rotatable or oscillating grinding wheel, and with a two-part dust protection device with an at least partially circumferential sealing flange (10) for creating an extraction space in the vicinity of the grinding wheel, the grinding wheel being at least partially surrounded by the dust protection device and the sealing flange (10) being provided with a recess (101) in a specific circumferential section, wherein the first part of the dust protection device is formed by a protective hood (4) and the second part is formed by means of an adjustment flange (6) rotatable relative to the protective hood (4) about an axis substantially orthogonal to a disc plane of the grinding disc, wherein the sealing flange (10) is arranged on the adjusting flange (6), wherein in a first rotational position of the adjusting flange (6) a connection of the suction chamber to the surroundings is created by the recess (101) and in a second rotational position of the adjusting flange (6) the recess (101) is thereby covered, in that a sealing lip (11) which is essentially ring-segment-like is arranged on the protective hood (4) and, in the second rotational position, overlaps the recess of the sealing flange (6),
    characterized in that
    the sealing lip (11) is arranged inside the suction chamber and in the second rotary position is able to cover the recess (101) from the inside of the suction chamber.
  2. The long neck sander according to claim 1,
    characterized in that
    the protective hood (4) is connected to the adjustment flange (6) via a slide bearing.
  3. The long-neck sander according to one of the preceding claims,
    characterized in that
    the adjusting flange (6) has, in the region of the recess (101), a sliding portion (61) of flat design for sliding along an adjacent surface inclined to the surface to be machined, in particular a wall or ceiling.
  4. The long neck sander according to claim 3,
    characterized in that
    the flat sliding portion (61) has a recess (613) and is designed in such a way that the outer circumference of the grinding wheel approaches the adjacent surface up to a distance of less than 10 mm, in particular of less than 5 mm.
  5. The long neck grinder according to any of the foregoing claims,
    characterized in that
    locking elements (111, 64, 65, 45) are provided for mutual fixing of the protective hood (4) and the adjustment flange (6).
  6. The long neck sander according to claim 5,
    characterized in that
    a detent element (64) is formed as a flat section on the adjusting flange (6) and a corresponding detent element (111) is formed as a flat section on the sealing lip (11).
  7. The long neck sander according to claim 5 or 6,
    characterized in that
    a detent element is formed as an annular segment-like rib (65) on the adjusting flange (6) and a further detent element is formed as a recess (45) in the protective hood (4) corresponding to the annular segment-like rib (65).
  8. Method for changing between the operating modes of a long-necked grinder according to one of the preceding claims, according to which the long-necked grinder is operated during a first operating mode for grinding away from the edge and during a second operating mode for grinding close to the edge, wherein a two-part dust protection device at least partially surrounding the grinding wheel of the long-neck grinder with an at least partially circumferential sealing flange (10) is used to form an extraction space, wherein the sealing flange (10) is provided with a recess (101) in a certain circumferential portion, wherein the first part of the dust protection device is formed by a protective hood (4) and the second part is formed by means of an adjustment flange (6) on which the sealing flange (10) is arranged, wherein the adjustment flange (6) is rotated relative to the protective hood (4) about an axis substantially orthogonal to a disc plane of the grinding disc from a first rotational position to a second rotational position for changing between the operating modes, wherein the recess (101) is covered for operation of the long-necked sander in the first operating mode and creates a connection of the suction chamber to the environment for operation of the long-necked sander in the second operating mode,
    characterized in that
    a sliding portion (61) of the adjusting flange (6), which is formed flat in the region of the recess (101), is pressed against an adjacent surface inclined to the surface to be machined, after which a handle of the long-neck sander, which is connected to the protective hood (4), is rotated to cause the rotation of the protective hood (4) relative to the adjusting flange (6).
EP15202098.8A 2015-01-07 2015-12-22 Long neck grinder with dust protection device Active EP3042738B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015100118.7A DE102015100118A1 (en) 2015-01-07 2015-01-07 Long-necked sander with dust protection device

Publications (3)

Publication Number Publication Date
EP3042738A2 EP3042738A2 (en) 2016-07-13
EP3042738A3 EP3042738A3 (en) 2016-10-19
EP3042738B1 true EP3042738B1 (en) 2020-08-12

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Application Number Title Priority Date Filing Date
EP15202098.8A Active EP3042738B1 (en) 2015-01-07 2015-12-22 Long neck grinder with dust protection device

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EP (1) EP3042738B1 (en)
DE (1) DE102015100118A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016106782A1 (en) 2016-04-13 2017-10-19 Festool Gmbh Hand machine tool with a cover device
EP3812089A1 (en) 2019-10-23 2021-04-28 Black & Decker Inc. Pole sander
DE102020125135A1 (en) 2020-09-25 2022-03-31 Jöst Gmbh Grinding wheel, grinding device and use of a grinding wheel
US11867224B2 (en) 2021-01-27 2024-01-09 Black & Decker Inc. Locking mechanism for two telescoping poles of a power tool

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Publication number Priority date Publication date Assignee Title
EP2186600B1 (en) * 2008-11-12 2011-11-02 Collomix Rühr-und Mischgeräte GmbH Surface grinder, especially concrete grinder
US8523637B2 (en) * 2009-07-21 2013-09-03 Dustless Depot, Llc Angle grinder dust shroud with slideable access hatch
DE102012111985A1 (en) * 2012-12-07 2014-06-12 Flex-Elektrowerkzeuge Gmbh Hand-held grinding machine has coupling device which is partially surrounded by annular or ring-shaped extraction channel portion of suction apparatus to couple transmission shaft with tool receiver

Non-Patent Citations (1)

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Title
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EP3042738A2 (en) 2016-07-13
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