EP2962809B1 - Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool - Google Patents

Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool Download PDF

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Publication number
EP2962809B1
EP2962809B1 EP15177840.4A EP15177840A EP2962809B1 EP 2962809 B1 EP2962809 B1 EP 2962809B1 EP 15177840 A EP15177840 A EP 15177840A EP 2962809 B1 EP2962809 B1 EP 2962809B1
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EP
European Patent Office
Prior art keywords
protective cover
blocking
rotation
electric power
power tool
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.)
Expired - Lifetime
Application number
EP15177840.4A
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German (de)
French (fr)
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EP2962809A1 (en
Inventor
Mike Voigt
Albert Kleider
Kurt Neef
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP2962809A1 publication Critical patent/EP2962809A1/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
    • 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
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools

Definitions

  • the invention is based on a protective hood according to the preamble of claim 1.
  • a protective hood is made EP 978 353 A known.
  • the invention proposes a protective cover according to claim 1.
  • the blocking means is formed by an outwardly projecting blocking lug on the protective hood, which abuts against a stop, should the guard rotate on a clamping neck in the direction of rotation.
  • the Blocking nose welded to the protective cover, glued or screwed.
  • the blocking nose can also be retrofitted. Alternatively, this may also be directed inwards at a suitable location.
  • the inventive design of the guard can both a security against contact of the insert tool improved; as well as a protective function; be ensured even with a bursting of the insert tool. Now apart flying fragments of the same can no longer rotate the guard so far on the drive shaft that the fragments endanger an operator. A blockage of the twisting of the protective cover in case of damage is independent of a tightening torque of attachment of the guard.
  • the blocking agent can be worked inexpensively and inexpensively directly from the sheet metal of the guard.
  • the blocking means is formed by a stop cam in a fastening flange which extends substantially parallel to the axis of rotation.
  • the protective hood is attached to the flange on the power tool and therefore allows a space-saving and easy-to-use arrangement of the rotation.
  • the stop cam can be directed inwards. Likewise, an arrangement with an outwardly directed stop cam is possible. The person skilled in the art will select a suitable arrangement according to the power tool used.
  • the blocking agent is formed by a stop cam in a tension band connected to the flange, an increased degree of safety can be obtained with an easily manufactured means.
  • the anti-rotation is not dependent on a clamping force, which is given by a tightening torque of a clamping screw with which the strap is mounted on a clamping neck. Even if the clamping screw has been tightened by mistake, the anti-twist protection is effective. If the stop cam encounters a stop, the guard is reliably held in this position.
  • the anti-rotation lock is arranged completely inside the protective hood.
  • the anti-twist device can be arranged to save space.
  • the blocking lug can be arranged on a surface extending substantially perpendicular to the axis of rotation adjacent to a recess for a drive shaft of the insert tool which is to be covered by the protective hood.
  • the blocking nose then conveniently does not protrude into the working area of an operator.
  • the invention proposes a power tool according to claim 9.
  • a rotation of the protective hood about an axis of rotation of the insert tool can be at least limited. This can both a security against contact of the insert tool improved and a protective function can be ensured even with a bursting of the insert tool. Flying fragments of the insert tool can no longer rotate the protective cover so far on the drive shaft that the fragments endanger an operator.
  • twisting of the protective hood can be restricted to a narrow angle range or completely prevented.
  • a clamping neck has an insertion groove with a limiting groove arranged at an angle thereto, a tightening strap with a stop cam pushed through on the inside can be inserted.
  • a twisting of the guard is possible only within the Begrenzungsnut, which limits the angular range of the guard.
  • the guard can be mounted in any position within the Begrenzungsnut.
  • a blocking lug and / or a stop cam can strike there and the protective hood can be obstructed in an undesired rotational movement.
  • the invention further proposes a system of protective hood and power tool according to claim 13.
  • the blocking means is formed by an outwardly projecting blocking lug on the protective hood, which abuts against a stop, should the guard rotate on a clamping neck in the direction of rotation.
  • the blocking means may be directly part of the protective hood, such as a cam, or may be provided on a fastening, with which the protective hood is connected to the power tool. A twisting of the guard beyond the stop is reliably avoided.
  • the safety of the operator can be guaranteed in case of failure.
  • the guard can be twisted at most in an angular range, which still ensures the protective function. Installation of the protective hood in a normal for the normal function of the power tool position is not hindered.
  • the power tool is designed as an angle grinder whose grinding wheel is at least partially covered with a protective hood.
  • the protective hood can no longer be pulled so far away from the fragments in the original direction of rotation that the operator can be hit by fragments.
  • the rotation is independent of a torque of attachment of the guard to a collet.
  • a power tool in the form of a preferred angle grinder is in Fig. 1 shown.
  • a housing 10 an unillustrated electric motor is arranged through which an insert tool 14, here a grinding wheel, is driven in rotation.
  • an insert tool 14 here a grinding wheel
  • an output shaft of the electric motor is arranged perpendicular to a drive shaft of the insert tool.
  • the angle grinder can be held and guided on an angularly projecting handle 12.
  • a protective cover 16 covers the insertion tool 14 so far that a contact protection for an operator is ensured.
  • the protective hood 16 is designed as a semicircle with a circumferentially projecting, peripheral flange which covers one half of the surface and edge of the grinding wheel 14.
  • the protective hood 16 has, for example, a flange 30 projecting centrally in its imaginary circular area and extending essentially parallel to a rotation axis 18 with a tensioning band 26 fastened thereto and is thus fastened to a clamping neck 24 ( Fig. 2-5 ).
  • a rotation 20 is provided according to the invention, which at least limits a rotation of the protective cover 16 about an axis of rotation of the insert tool 14 and the clamping neck 24 ,
  • Fig. 2 to Fig. 5 show a first preferred embodiment of an anti-rotation device 20.
  • a blocking means in the form of a stop cam 32 is provided on the protective hood side, which is formed in a clamping band 26 for fastening a protective hood 16 on the clamping collar 24 and is pressed to the inside of the clamping band 26 ( Fig. 4 ).
  • a substantially vertically extending insertion 36 is provided with an angle thereto arranged Begrenzungsnut 34 which forms a stop cam 32 corresponding to the stop means.
  • the limiting groove 34 limits a possible rotation about an axis of rotation 18 to an angle range ⁇ (FIG. Fig. 3 ).
  • the rotation is independent of a tightening torque of a clamping screw 28, with which the clamping band 26 is tightened around the clamping collar 24 around, blocked by one or the other end of the Begrenzungsnut 34.
  • the tension band 26 is more detailed in FIG Fig. 4 shown.
  • the clamping band 26 surrounds a protruding from the protective cover 16 flange 30 and clamps the flange 30 of the protective cover 16 on the clamping neck 24 of the drive shaft 22 fixed.
  • the stop cam 32 is inserted via the insertion groove 36 into the limiting groove 34.
  • the clamping screw 28 is screwed into a screw receptacle 38. By tightening the clamping screw 28, the protective cover 16 can be clamped more or less firmly on the clamping neck 24.
  • the limiting groove 34 expediently extends from the insertion groove 36 in the direction of rotation of the insertion tool 14. A rotation of the protective hood 16 is only possible to a maximum extent in the angular range ⁇ over which the limiting groove 34 extends (FIG. Fig. 3 ).
  • Fig. 5 shows a plan view of the arrangement.
  • an exhaust 44 may be integrated, can be removed with the dusts that arise when working with the insert tool 14.
  • the stop cam 32 is pressed on the inside of the tension band 26, with which the protective cover 16 is attached to the clamping neck 24, and projects into the limiting groove 34 of the clamping neck 24.
  • FIG. 6 Another preferred embodiment of the anti-rotation device 20 is in Fig. 6 shown.
  • a blocking lug 40 is formed on the protective cover 16, which is machined out of the sheet of the protective cover 16 by partial punching and bending.
  • the blocking lug 40 may also be welded, glued or screwed.
  • the blocking lug 40 projects outwardly from a surface of the protective hood 16 such that it can come into contact with a stop 42 which is attached to the housing 10.
  • the stop 42 may be incorporated directly into the housing 10 or welded, glued or screwed.
  • the stop 42 or the blocking lug 40 can also be retrofitted.
  • a blocking lug 40 'from a perpendicular to the axis of rotation 18 aligned wall of the protective cover 16 can be worked out by partial punching and bending.
  • the blocking lug 40 abuts against the stop 42, should the protective cover 16 rotate on the clamping neck 24 in the direction of rotation.
  • the protective cover 16 may be fastened to the clamping neck 24 with a conventional tensioning band 26.
  • the tension band 26 may additionally be equipped with an anti-rotation device 20 according to the invention, as described in the preceding figures.
  • the protective cover 16 can be suitably mounted so that the blocking means 32, 40 are each adjacent as closely as possible to the stop means 34, 42 adjacent. A rotation of the protective cover 16 on the clamping neck 24, which is caused by a bursting of the insert tool 14, can be minimized thereby.

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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

Stand der TechnikState of the art

Die Erfindung geht aus von einer Schutzhaube nach dem Oberbegriff des Anspruchs 1. Eine solche Schutzhaube ist aus EP 978 353 A bekannt.The invention is based on a protective hood according to the preamble of claim 1. Such a protective hood is made EP 978 353 A known.

Es ist bekannt, bei Elektrowerkzeugmaschinen mit rotierend antreibbaren Einsatzwerkzeugen, insbesondere bei Winkelschleifern, Schutzhauben vorzusehen, um einen Bediener vor Verletzungen zu schützen, die bei einem Zerbersten des Einsatzwerkzeugs durch umherfliegende Bruchstücke drohen.It is known to provide for power tools with rotating drivable tools, especially in angle grinders, protective hoods to protect an operator from injuries that threaten at a bursting of the tool through flying fragments.

Aus EP 599 090 A1 ist bereits eine Schutzhaube für eine Elektrowerkzeugmaschine mit einem rotierend antreibbaren Einsatzwerkzeug bekannt, mit der das Einsatzwerkzeug zumindest bereichsweise abdeckbar ist. Diese Schutzhaube weist zumindest ein Blockiermittel auf, das dazu vorgesehen ist, ein Verdrehen der Schutzhaube um eine Drehachse des Einsatzwerkzeugs zumindest zu behindern.Out EP 599 090 A1 already a protective hood for a power tool with a rotating drivable insert tool is known, with which the insert tool is at least partially coverable. This protective hood has at least one blocking means, which is provided to hinder at least a rotation of the protective hood about an axis of rotation of the insertion tool.

Offenbarung der ErfindungDisclosure of the invention

Die Erfindung schlägt eine Schutzhaube gemäß dem Anspruch 1 vor.The invention proposes a protective cover according to claim 1.

Es wird vorgeschlagen, dass das Blockiermittel durch eine an der Schutzhaube nach außen abstehende Blockiernase gebildet ist, die an einen Anschlag stößt, sollte sich die Schutzhaube auf einem Spannhals in Drehrichtung verdrehen. Optional kann die Blockiernase mit der Schutzhaube verschweißt, geklebt oder geschraubt sein. Die Blockiernase lässt sich auch nachträglich installieren. Alternativ kann diese an geeigneter Stelle auch nach innen gerichtet sein. Durch die erfindungsgemäße Ausgestaltung der Schutzhaube kann sowohl eine Sicherheit gegen Berührung des Einsatzwerkzeugs verbessert; als auch eine Schutzfunktion; auch bei einem Zerbersten des Einsatzwerkzeugs gewährleistet werden. Nunmehr können auseinander fliegende Bruchstücke desselben die Schutzhaube nicht mehr so weit auf der Antriebswelle verdrehen, dass die Bruchstücke einen Bediener gefährden. Eine Blockierung des Verdrehens der Schutzhaube im Schadensfall ist unabhängig von einem Anzugsmoment einer Befestigung der Schutzhaube. Zudem kann das Blockiermittel preiswert und unaufwendig direkt aus dem Blech der Schutzhaube gearbeitet werden.It is proposed that the blocking means is formed by an outwardly projecting blocking lug on the protective hood, which abuts against a stop, should the guard rotate on a clamping neck in the direction of rotation. Optionally, the Blocking nose welded to the protective cover, glued or screwed. The blocking nose can also be retrofitted. Alternatively, this may also be directed inwards at a suitable location. The inventive design of the guard can both a security against contact of the insert tool improved; as well as a protective function; be ensured even with a bursting of the insert tool. Now apart flying fragments of the same can no longer rotate the guard so far on the drive shaft that the fragments endanger an operator. A blockage of the twisting of the protective cover in case of damage is independent of a tightening torque of attachment of the guard. In addition, the blocking agent can be worked inexpensively and inexpensively directly from the sheet metal of the guard.

Bevorzugt ist das Blockiermittel durch einen Anschlagnocken in einem zur Befestigung dienenden Flansch, der sich im Wesentlichen parallel zur Drehachse erstreckt, gebildet. Die Schutzhaube wird mit dem Flansch an der Elektrowerkzeugmaschine angebracht und erlaubt daher eine platzsparende und einfach zu handhabende Anordnung der Verdrehsicherung. Der Anschlagnocken kann nach innen gerichtet sein. Ebenso ist eine Anordnung mit einem nach außen gerichteten Anschlagnocken möglich. Der Fachmann wird entsprechend der verwendeten Elektrowerkzeugmaschine eine geeignete Anordnung auswählen.Preferably, the blocking means is formed by a stop cam in a fastening flange which extends substantially parallel to the axis of rotation. The protective hood is attached to the flange on the power tool and therefore allows a space-saving and easy-to-use arrangement of the rotation. The stop cam can be directed inwards. Likewise, an arrangement with an outwardly directed stop cam is possible. The person skilled in the art will select a suitable arrangement according to the power tool used.

Ist das Blockiermittel durch einen Anschlagnocken in einem mit dem Flansch verbundenen Spannband gebildet, kann mit einem leicht herstellbaren Mittel ein erhöhtes Maß an Sicherheit gewonnen werden. Die Verdrehsicherung ist nicht von einer Klemmkraft abhängig, die durch ein Anzugsmoment einer Klemmschraube gegeben ist, mit dem das Spannband auf einem Spannhals befestigt ist. Auch wenn versehentlich die Klemmschraube zu schwach angezogen wurde, ist die Verdrehsicherung wirksam. Trifft der Anschlagnocken auf einen Anschlag, wird die Schutzhaube in dieser Position zuverlässig festgehalten.If the blocking agent is formed by a stop cam in a tension band connected to the flange, an increased degree of safety can be obtained with an easily manufactured means. The anti-rotation is not dependent on a clamping force, which is given by a tightening torque of a clamping screw with which the strap is mounted on a clamping neck. Even if the clamping screw has been tightened by mistake, the anti-twist protection is effective. If the stop cam encounters a stop, the guard is reliably held in this position.

Ist der Anschlagnocken in montiertem Zustand zu einem Spannhals hin gerichtet, kann am Spannhals der Elektrowerkzeugmaschine ein entsprechender Anschlag vorgesehen werden. Die Verdrehsicherung ist vollständig im Innenbereich der Schutzhaube angeordnet.If the stop cam in the assembled state is directed towards a clamping neck, a corresponding stop can be provided on the clamping neck of the electric machine tool. The anti-rotation lock is arranged completely inside the protective hood.

Ist die Blockiernase an dem Flansch angeordnet, kann die Verdrehsicherung platzsparend angeordnet werden.If the blocking lug is arranged on the flange, the anti-twist device can be arranged to save space.

Ebenso kann die Blockiernase an einer sich im Wesentlichen senkrecht zur Drehachse erstreckenden Fläche benachbart zu einer Ausnehmung für eine Antriebswelle des Einsatzwerkzeugs, das von der Schutzhaube abgedeckt werden soll, angeordnet sein. Die Blockiernase ragt dann günstigerweise nicht in den Arbeitsbereich eines Bedieners hinein.Likewise, the blocking lug can be arranged on a surface extending substantially perpendicular to the axis of rotation adjacent to a recess for a drive shaft of the insert tool which is to be covered by the protective hood. The blocking nose then conveniently does not protrude into the working area of an operator.

Weiterhin schlägt die Erfindung eine Elektrowerkzeugmaschine gemäß dem Anspruch 9 vor.Furthermore, the invention proposes a power tool according to claim 9.

Es wird vorgeschlagen, eine Verdrehsicherung vorzusehen, die eine Freigabe des Einsatzwerkzeugs in Richtung eines Bedieners zumindest behindert. Ein Verdrehen der Schutzhaube um eine Drehachse des Einsatzwerkzeugs kann zumindest begrenzt werden. Damit kann sowohl eine Sicherheit gegen Berührung des Einsatzwerkzeugs verbessert als auch eine Schutzfunktion auch bei einem Zerbersten des Einsatzwerkzeugs gewährleistet werden. Umherfliegende Bruchstücke des Einsatzwerkzeugs können die Schutzhaube nicht mehr so weit auf der Antriebswelle verdrehen, dass die Bruchstücke einen Bediener gefährden.It is proposed to provide an anti-rotation device which at least hampers release of the insertion tool in the direction of an operator. A rotation of the protective hood about an axis of rotation of the insert tool can be at least limited. This can both a security against contact of the insert tool improved and a protective function can be ensured even with a bursting of the insert tool. Flying fragments of the insert tool can no longer rotate the protective cover so far on the drive shaft that the fragments endanger an operator.

Weist die Verdrehsicherung ein mit dem Blockiermittel korrespondierendes Anschlagmittel auf, kann ein Verdrehen der Schutzhaube auf einen engen Winkelbereich beschränkt oder ganz unterbunden werden.If the rotation lock has a stop means corresponding to the blocking means, twisting of the protective hood can be restricted to a narrow angle range or completely prevented.

Weist ein Spannhals eine Einführnut mit einer winklig dazu angeordneten Begrenzungsnut auf, kann ein Spannband mit auf dessen Innenseite durchgedrücktem Anschlagnocken eingeführt werden. Ein Verdrehen der Schutzhaube ist nur innerhalb der Begrenzungsnut möglich, was den Winkelbereich der Schutzhaube beschränkt. Die Schutzhaube kann in jeder Position innerhalb der Begrenzungsnut befestigt werden.If a clamping neck has an insertion groove with a limiting groove arranged at an angle thereto, a tightening strap with a stop cam pushed through on the inside can be inserted. A twisting of the guard is possible only within the Begrenzungsnut, which limits the angular range of the guard. The guard can be mounted in any position within the Begrenzungsnut.

Ist an dem Gehäuse ein winklig abstehender Anschlag vorgesehen, kann eine Blockiernase und/oder ein Anschlagnocken dort anschlagen und die Schutzhaube in einer unerwünschten Drehbewegung behindert werden.If an angled protruding stop is provided on the housing, a blocking lug and / or a stop cam can strike there and the protective hood can be obstructed in an undesired rotational movement.

Die Erfindung schlägt weiterhin ein System aus Schutzhaube und Elektrowerkzeugmaschine gemäß dem Anspruch 13 vor.The invention further proposes a system of protective hood and power tool according to claim 13.

Es wird vorgeschlagen, dass das Blockiermittel durch eine an der Schutzhaube nach außen abstehende Blockiernase gebildet ist, die an einen Anschlag stößt, sollte sich die Schutzhaube auf einem Spannhals in Drehrichtung verdrehen. Das Blockiermittel kann unmittelbar Bestandteil der Schutzhaube sein, etwa auch ein Nocken, oder an einer Befestigung vorgesehen sein, mit der die Schutzhaube mit der Elektrowerkzeugmaschine verbunden ist. Ein Verdrehen der Schutzhaube über den Anschlag hinaus wird zuverlässig vermieden. Durch die Abstimmung von Blockiermittel und Anschlag kann ein zulässiger Winkelbereich, in dem ein Verdrehen möglich ist, gezielt vorgegeben werden.It is proposed that the blocking means is formed by an outwardly projecting blocking lug on the protective hood, which abuts against a stop, should the guard rotate on a clamping neck in the direction of rotation. The blocking means may be directly part of the protective hood, such as a cam, or may be provided on a fastening, with which the protective hood is connected to the power tool. A twisting of the guard beyond the stop is reliably avoided. By adjusting the blocking agent and stop a permissible angle range in which twisting is possible, can be specified.

Ist eine Verdrehsicherung durch Einwirken des Einsatzwerkzeugs auf die Schutzhaube auslösbar, kann im Fehlerfall die Sicherheit des Bedieners gewährleistet werden. Die Schutzhaube kann höchstens in einem Winkelbereich verdreht werden, der die Schutzfunktion noch gewährleistet. Eine Montage der Schutzhaube in eine für die normale Funktion des Elektrowerkzeugs übliche Position wird nicht behindert.Is an anti-rotation triggered by the action of the insert tool on the guard, the safety of the operator can be guaranteed in case of failure. The guard can be twisted at most in an angular range, which still ensures the protective function. Installation of the protective hood in a normal for the normal function of the power tool position is not hindered.

Besonders bevorzugt ist die Elektrowerkzeugmaschine als Winkelschleifmaschine ausgebildet, deren Schleifscheibe zumindest bereichsweise mit einer Schutzhaube abgedeckt ist. Die Schutzhaube kann beim Zerbersten der Schleifscheibe nicht mehr so weit von den Bruchstücken in der ursprünglichen Drehrichtung mitgenommen werden, dass der Bediener von Bruchstücken getroffen werden kann. Die Verdrehsicherung ist unabhängig von einem Anzugsmoment einer Befestigung der Schutzhaube an einem Spannhals.Particularly preferably, the power tool is designed as an angle grinder whose grinding wheel is at least partially covered with a protective hood. When the grinding wheel bursts, the protective hood can no longer be pulled so far away from the fragments in the original direction of rotation that the operator can be hit by fragments. The rotation is independent of a torque of attachment of the guard to a collet.

Zeichnungdrawing

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung sind zwei Ausführungsbeispiele der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawing, two embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Es zeigen:

Fig. 1
einen bevorzugten Winkelschleifer,
Fig. 2
schematisch eine seitliche Ansicht gemäß einem ersten Ausführungsbeispiel,
Fig. 3
eine Darstellung eines maximalen Winkelbereichs bei einer Verdrehung der Schutzhaube,
Fig. 4
eine schematische Ansicht eines Spannbands zum Befestigen der Schutzhaube,
Fig. 5
eine Aufsicht auf eine Schutzhaube mit Spannband,
Fig. 6
eine Verdrehsicherung gemäß einem zweiten Ausführungsbeispiel.
Show it:
Fig. 1
a preferred angle grinder,
Fig. 2
schematically a side view according to a first embodiment,
Fig. 3
a representation of a maximum angular range during a rotation of the protective hood,
Fig. 4
a schematic view of a tension band for attaching the guard,
Fig. 5
a view of a protective hood with strap,
Fig. 6
an anti-rotation device according to a second embodiment.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Eine Elektrowerkzeugmaschine in Gestalt eines bevorzugten Winkelschleifers ist in Fig. 1 dargestellt. In einem Gehäuse 10 ist ein nicht dargestellter Elektromotor angeordnet, durch den ein Einsatzwerkzeug 14, hier eine Schleifscheibe, rotierend antreibbar ist. Bei einem Winkelschleifer ist üblicherweise eine Abtriebswelle des Elektromotors senkrecht zu einer Antriebswelle des Einsatzwerkzeugs angeordnet. Der Winkelschleifer kann an einem winklig abstehenden Handgriff 12 gehalten und geführt werden. Eine Schutzhaube 16 deckt das Einsatzwerkzeug 14 soweit ab, dass ein Berührschutz für einen Bediener gewährleistet ist. Die Schutzhaube 16 ist als Halbkreis mit einem am Umfang nach unten ragenden, umfangseitigen Flansch ausgeführt, der die eine Hälfte der Fläche und Kante der Schleifscheibe 14 überdeckt. Die Schutzhaube 16 weist beispielsweise einen mittig in ihrer gedachten Kreisfläche nach oben ragenden, im Wesentlichen parallel zu einer Drehachse 18 verlaufenden Flansch 30 mit einem daran befestigten Spannband 26 auf und ist damit an einem Spannhals 24 befes-tigt (Fig. 2 - 5).A power tool in the form of a preferred angle grinder is in Fig. 1 shown. In a housing 10, an unillustrated electric motor is arranged through which an insert tool 14, here a grinding wheel, is driven in rotation. In an angle grinder usually an output shaft of the electric motor is arranged perpendicular to a drive shaft of the insert tool. The angle grinder can be held and guided on an angularly projecting handle 12. A protective cover 16 covers the insertion tool 14 so far that a contact protection for an operator is ensured. The protective hood 16 is designed as a semicircle with a circumferentially projecting, peripheral flange which covers one half of the surface and edge of the grinding wheel 14. The protective hood 16 has, for example, a flange 30 projecting centrally in its imaginary circular area and extending essentially parallel to a rotation axis 18 with a tensioning band 26 fastened thereto and is thus fastened to a clamping neck 24 ( Fig. 2-5 ).

Damit bei einem Zerbersten des Einsatzwerkzeugs 14 die Schutzhaube 16 nicht so weit verdreht wird, dass Bruchstücke den Bediener treffen können, ist erfindungsgemäß eine Verdrehsicherung 20 vorgesehen, die ein Verdrehen der Schutzhaube 16 um eine Drehachse des Einsatzwerkzeugs 14 bzw. um den Spannhals 24 zumindest begrenzt.So that when a bursting of the insert tool 14, the protective cover 16 is not rotated so far that fragments can hit the operator, a rotation 20 is provided according to the invention, which at least limits a rotation of the protective cover 16 about an axis of rotation of the insert tool 14 and the clamping neck 24 ,

Fig. 2 bis Fig. 5 zeigen ein erstes bevorzugtes Ausführungsbeispiel einer Verdrehsicherung 20. In den Figuren sind grundsätzlich gleiche Teile mit den gleichen Bezugszeichen beziffert. An einem Spannhals 24 einer Antriebswelle 22 ist schutzhaubenseitig ein Blockiermittel in Form eines Anschlagnockens 32 vorgesehen, der in einem Spannband 26 zur Befestigung einer Schutzhaube 16 auf dem Spannhals 24 gebildet und zur Innenseite des Spannbands 26 durchgedrückt ist (Fig. 4). Im Spannhals 24 ist eine im Wesentlichen senkrecht verlaufende Einführnut 36 mit einer winklig dazu angeordneten Begrenzungsnut 34 vorgesehen, die ein zum Anschlagnocken 32 korrespondierendes Anschlagmittel bildet. Wird die Schutzhaube 16 beim Zerbersten des Einsatzwerkzeugs 14 verdreht, begrenzt die Begrenzungsnut 34 eine mögliche Verdrehung um eine Drehachse 18 auf einen Winkelbereich α (Fig. 3). Die Verdrehung wird unabhängig von einem Anzugsmoment einer Klemmschraube 28, mit der das Spannband 26 um den Spannhals 24 herum festgezogen wird, durch das eine oder andere Ende der Begrenzungsnut 34 blockiert. Fig. 2 to Fig. 5 show a first preferred embodiment of an anti-rotation device 20. In the figures, basically the same parts are numbered with the same reference numerals. At a clamping neck 24 of a drive shaft 22, a blocking means in the form of a stop cam 32 is provided on the protective hood side, which is formed in a clamping band 26 for fastening a protective hood 16 on the clamping collar 24 and is pressed to the inside of the clamping band 26 ( Fig. 4 ). In the clamping neck 24 is a substantially vertically extending insertion 36 is provided with an angle thereto arranged Begrenzungsnut 34 which forms a stop cam 32 corresponding to the stop means. If the protective hood 16 is rotated when the insertion tool 14 bursts, the limiting groove 34 limits a possible rotation about an axis of rotation 18 to an angle range α (FIG. Fig. 3 ). The rotation is independent of a tightening torque of a clamping screw 28, with which the clamping band 26 is tightened around the clamping collar 24 around, blocked by one or the other end of the Begrenzungsnut 34.

Das Spannband 26 ist detaillierter in Fig. 4 dargestellt. Das Spannband 26 umgibt einen von der Schutzhaube 16 abstehenden Flansch 30 und klemmt den Flansch 30 der Schutzhaube 16 auf dem Spannhals 24 der Antriebswelle 22 fest. Zur Montage der Schutzhaube 16 wird der Anschlagnocken 32 über die Einführnut 36 in die Begrenzungsnut 34 eingeführt. Die Klemmschraube 28 wird in eine Schraubenaufnahme 38 eingeschraubt. Durch Festdrehen der Klemmschraube 28 kann die Schutzhaube 16 mehr oder weniger fest auf den Spannhals 24 geklemmt werden. Zweckmäßigerweise erstreckt sich die Begrenzungsnut 34 von der Einführnut 36 ausgehend in Drehrichtung des Einsatzwerkzeugs 14. Eine Verdrehung der Schutzhaube 16 ist nur maximal im Winkelbereich α möglich, über den sich die Begrenzungsnut 34 erstreckt (Fig. 3).The tension band 26 is more detailed in FIG Fig. 4 shown. The clamping band 26 surrounds a protruding from the protective cover 16 flange 30 and clamps the flange 30 of the protective cover 16 on the clamping neck 24 of the drive shaft 22 fixed. For mounting the protective cover 16, the stop cam 32 is inserted via the insertion groove 36 into the limiting groove 34. The clamping screw 28 is screwed into a screw receptacle 38. By tightening the clamping screw 28, the protective cover 16 can be clamped more or less firmly on the clamping neck 24. The limiting groove 34 expediently extends from the insertion groove 36 in the direction of rotation of the insertion tool 14. A rotation of the protective hood 16 is only possible to a maximum extent in the angular range α over which the limiting groove 34 extends (FIG. Fig. 3 ).

Fig. 5 zeigt eine Aufsicht auf die Anordnung. In die Schutzhaube 16 kann auch eine Absaugung 44 integriert sein, mit der Stäube entfernt werden können, die beim Arbeiten mit dem Einsatzwerkzeug 14 entstehen. Der Anschlagnocken 32 ist auf der Innenseite des Spannbands 26, mit dem die Schutzhaube 16 am Spannhals 24 befestigt ist, durchgedrückt und ragt in die Begrenzungsnut 34 des Spannhalses 24 hinein. Fig. 5 shows a plan view of the arrangement. In the protective cover 16, an exhaust 44 may be integrated, can be removed with the dusts that arise when working with the insert tool 14. The stop cam 32 is pressed on the inside of the tension band 26, with which the protective cover 16 is attached to the clamping neck 24, and projects into the limiting groove 34 of the clamping neck 24.

Ein weiteres bevorzugtes Ausführungsbeispiel der Verdrehsicherung 20 ist in Fig. 6 dargestellt. Dort ist eine Blockiernase 40 an der Schutzhaube 16 ausgebildet, welche aus dem Blech der Schutzhaube 16 durch teilweises Ausstanzen und Umbiegen herausgearbeitet ist. Optional kann die Blockiernase 40 auch angeschweißt, geklebt oder angeschraubt sein. Die Blockiernase 40 ragt derart aus einer Oberfläche der Schutzhaube 16 nach außen, dass sie mit einem Anschlag 42 in Kontakt kommen kann, der am Gehäuse 10 angebracht ist. Der Anschlag 42 kann direkt in das Gehäuse 10 eingearbeitet oder angeschweißt, geklebt oder angeschraubt sein. Der Anschlag 42 oder die Blockiernase 40 können auch nachträglich montiert werden. Alternativ zur Blockiernase 40 kann eine Blockiernase 40' aus einer senkrecht zur Drehachse 18 ausgerichteten Wand der Schutzhaube 16 durch teilweises Ausstanzen und Umbiegen herausgearbeitet sein.Another preferred embodiment of the anti-rotation device 20 is in Fig. 6 shown. There is a blocking lug 40 is formed on the protective cover 16, which is machined out of the sheet of the protective cover 16 by partial punching and bending. Optionally, the blocking lug 40 may also be welded, glued or screwed. The blocking lug 40 projects outwardly from a surface of the protective hood 16 such that it can come into contact with a stop 42 which is attached to the housing 10. The stop 42 may be incorporated directly into the housing 10 or welded, glued or screwed. The stop 42 or the blocking lug 40 can also be retrofitted. Alternative to Blocking lug 40, a blocking lug 40 'from a perpendicular to the axis of rotation 18 aligned wall of the protective cover 16 can be worked out by partial punching and bending.

Die Blockiernase 40 stößt an den Anschlag 42, sollte sich die Schutzhaube 16 auf dem Spannhals 24 in Drehrichtung verdrehen. Die Schutzhaube 16 kann mit einem üblichen Spannband 26 am Spannhals 24 befestigt sein. Das Spannband 26 kann zusätzlich ebenfalls mit einer erfindungsgemäßen Verdrehsicherung 20 ausgestattet sein, wie sie in den vorangegangenen Figuren beschrieben wurde.The blocking lug 40 abuts against the stop 42, should the protective cover 16 rotate on the clamping neck 24 in the direction of rotation. The protective cover 16 may be fastened to the clamping neck 24 with a conventional tensioning band 26. The tension band 26 may additionally be equipped with an anti-rotation device 20 according to the invention, as described in the preceding figures.

Die Schutzhaube 16 kann zweckmäßigerweise so montiert werden, dass das Blockiermittel 32, 40 jeweils möglichst eng benachbart zum Anschlagmittel 34, 42 benachbart ist. Ein Verdrehen der Schutzhaube 16 auf dem Spannhals 24, welches durch ein Zerbersten des Einsatzwerkzeugs 14 verursacht wird, kann dadurch minimiert werden. The protective cover 16 can be suitably mounted so that the blocking means 32, 40 are each adjacent as closely as possible to the stop means 34, 42 adjacent. A rotation of the protective cover 16 on the clamping neck 24, which is caused by a bursting of the insert tool 14, can be minimized thereby.

Claims (15)

  1. Protective cover for an electric power tool having an application tool (14) that is drivable in rotation, the application tool (14) being at least regionally coverable with said protective cover, and having at least one blocking means (40) provided to at least impede any turning of the protective cover about an axis of rotation (18) of the application tool (14), characterized in that the blocking means (40) is formed by an outwardly protruding blocking lug (40) on the protective cover, said blocking lug (40) being arranged on a flange (30) that serves for fastening and butting against a stop (42) if the protective cover (16) turns in a direction of rotation on a clamping neck (24).
  2. Protective cover according to Claim 1, characterized in that the blocking lug (40) is arranged on a face extending substantially perpendicularly to the axis of rotation (18), next to a cutout for a drive shaft (22) .
  3. Protective cover according to either of the preceding claims, characterized in that the blocking lug (40) is a constituent part of the protective cover (16), with which the protective cover is connected to the electric power tool.
  4. Protective cover according to one of the preceding claims, characterized in that the blocking lug (40) is provided on a fastening means, with which the protective cover is connected to the electric power tool.
  5. Protective cover according to one of the preceding claims, characterized in that the blocking lug (40) has been worked out of the sheet metal of the protective cover (16) by being partially punched out and bent.
  6. Protective cover according to one of the preceding claims, characterized in that the blocking lug (40) has been welded, screwed or adhesively bonded to the protective cover (16).
  7. Protective cover according to one of the preceding claims, characterized in that the protective cover (16) is fastened to the clamping neck (24) by a clamping band (26), wherein the clamping band (26) is equipped with the anti-turn device (20).
  8. Protective cover according to one of the preceding claims, characterized in that the protective cover (16) can expediently be mounted such that the blocking lug (40) is in each case as close as possible to the stop (42).
  9. Electric power tool having an electric motor arranged in a housing (10), an application tool (14) being drivable in rotation with said electric motor, characterized in that an anti-turn device (20) is provided, which at least impedes any release of the application tool (14) in the direction of an operator, wherein the anti-turn device (20) has a stop means (42), corresponding with a blocking means (40) of a protective cover (16) according to one of Claims 1 to 8, for the blocking means (40), such that turning of the protective cover (16) is limited to an angular range (a).
  10. Electric power tool according to Claim 9, characterized in that a clamping neck (24) has an introduction slot (36) with a limiting slot (34) arranged at an angle thereto.
  11. Electric power tool according to either of Claims 9 and 10, characterized in that a stop (42) protruding at an angle is provided on the housing (10).
  12. Electric power tool according to one of Claims 9 to 11, characterized in that the protective cover (16) is fastened to the clamping neck (24) by a clamping band (26), wherein the clamping band (26) is equipped with the anti-turn device (20).
  13. System of a protective cover according to one of Claims 1 to 8 and an electric power tool according to one of Claims 9 to 12, characterized in that the blocking means (40) is formed by an outwardly protruding blocking lug (40) on the protective cover, said blocking lug (40) butting against a stop (42) if the protective cover (16) turns in a direction of rotation on a clamping neck (24).
  14. System according to Claim 13, characterized in that the anti-turn device (20) is able to be activated by the application tool (14) acting on the protective cover (16).
  15. Angle grinder, the grinding wheel of which is covered at least regionally by a protective cover (16) according to one of Claims 1 to 8.
EP15177840.4A 2003-10-17 2004-07-30 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool Expired - Lifetime EP2962809B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10348395A DE10348395A1 (en) 2003-10-17 2003-10-17 Protective cover for a power tool, power tool and system with protective hood and power tool
PCT/DE2004/001716 WO2005044514A1 (en) 2003-10-17 2004-07-30 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool
EP04762561.1A EP1677948B1 (en) 2003-10-17 2004-07-30 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP04762561.1A Division-Into EP1677948B1 (en) 2003-10-17 2004-07-30 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool
EP04762561.1A Division EP1677948B1 (en) 2003-10-17 2004-07-30 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool

Publications (2)

Publication Number Publication Date
EP2962809A1 EP2962809A1 (en) 2016-01-06
EP2962809B1 true EP2962809B1 (en) 2019-06-12

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EP15177840.4A Expired - Lifetime EP2962809B1 (en) 2003-10-17 2004-07-30 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool
EP04762561.1A Expired - Lifetime EP1677948B1 (en) 2003-10-17 2004-07-30 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool

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EP04762561.1A Expired - Lifetime EP1677948B1 (en) 2003-10-17 2004-07-30 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool

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US (2) US20060286910A1 (en)
EP (2) EP2962809B1 (en)
CN (1) CN1867425B (en)
DE (1) DE10348395A1 (en)
WO (1) WO2005044514A1 (en)

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Publication number Publication date
US8011997B2 (en) 2011-09-06
US20060286910A1 (en) 2006-12-21
EP1677948B1 (en) 2016-09-07
EP1677948A1 (en) 2006-07-12
US20100248599A1 (en) 2010-09-30
CN1867425B (en) 2013-07-31
CN1867425A (en) 2006-11-22
DE10348395A1 (en) 2005-05-19
WO2005044514A1 (en) 2005-05-19
EP2962809A1 (en) 2016-01-06

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