EP2464494B1 - Machine tool having a protective cover - Google Patents

Machine tool having a protective cover Download PDF

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Publication number
EP2464494B1
EP2464494B1 EP10724080.6A EP10724080A EP2464494B1 EP 2464494 B1 EP2464494 B1 EP 2464494B1 EP 10724080 A EP10724080 A EP 10724080A EP 2464494 B1 EP2464494 B1 EP 2464494B1
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EP
European Patent Office
Prior art keywords
stop
power tool
flange
tool according
counterpart
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EP10724080.6A
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German (de)
French (fr)
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EP2464494A1 (en
Inventor
Florian Esenwein
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • 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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools

Definitions

  • the invention relates to a machine tool, in particular an angle grinder, with a tool covering a protective hood, according to the preamble of claim 1.
  • a machine tool with a rotating tool in the form of a grinding wheel is known, which is overlapped by a protective hood, which is attached to a machine-side flange.
  • the protective cover has a clamping collar, which can be placed on the flange and is fastened to the flange by means of a clamp.
  • the guard can be fixed in different angular positions on the flange. To change the angular position, the clamp is loosened, after which the guard can be pivoted to the desired position.
  • the pivoting range is limited to a defined angle range;
  • a stop device is arranged on the machine tool, consisting of a projection on the clamp and a counterpart on the housing of the machine tool.
  • the clamp forms with the guard a common component, so that upon rotation of the guard and the clamp is rotated until it reaches the counterpart on the housing of the machine tool.
  • the one-piece clamp and guard provides a relatively complex design. Moreover, this embodiment is not suitable to reliably limit the rotation of the guard in a case of breakage of the disc-shaped tool to a maximum allowable angle. Due to the relatively large mass of the guard there is a risk that despite reaching the stop on the stop device on the clamp of the hood body is rotated beyond the allowable angle range by the action of the inertial forces.
  • the DE 10 2007 057 032 A1 discloses a hand tool with a protective hood with a receiving collar, which also forms a clamping band and can be placed on a flange neck of the machine tool.
  • a stop On the strap is a stop, which cooperates with a housing-side counter-stop.
  • the invention has for its object to increase safety in the event of tool breakage on a machine tool.
  • the machine tool according to the invention is preferably a hand-held machine tool, in particular an electric hand tool such as an angle grinder whose tool is at least partially covered by a protective hood, which is provided with a clamping collar whose axis of rotation is coaxial with the central axis of the tool shaft.
  • the clamping collar is provided, for example, cylindrical or faceted with continuous or closed or perforated or segmented lateral surface.
  • the clamping collar of the guard is attached to a machine-side flange, which has a contact surface for the clamping collar for this purpose.
  • About the clamping device of the clamping collar with a radial clamping force against the contact surface on the machine side flange is subjected to force.
  • a stop device is provided in the transmission path between the guard and the flange, which limits the relative rotational movement between the guard and flange to an acceptable level.
  • the stop device comprises a stop element on the protective hood, in the stop position an associated counterpart on the flange or a component connected to the housing of the machine tool is applied.
  • the protective hood and the clamping device are designed here as separate components.
  • the guard and the clamping device usually a clamp - separate components, so that the guard without loss of function can be made easier.
  • the clamping device as a separate component acts on the protective cover in the region of the clamping collar and presses it against the contact surface on the machine-side or housing-side flange of the machine tool.
  • the stop element is arranged directly on the guard, which on the one hand ensures that the stop element is at a sufficient distance from the axis of rotation through the clamping collar of the guard and thus act at a given moment lower forces on the stop member.
  • the functionality of the stop device is ensured independently of the clamping device, so that even in the case of failure of the clamping device, the guard can only be rotated until reaching the stop.
  • the protective hood in a neutral working position in the direction of rotation has a twisting area up to the stop of the stop device.
  • the neutral working position is defined by parallel alignment of the axis of symmetry of the hood body with the armature longitudinal axis of the electric drive motor. Starting from this neutral working position, there is expediently a turning range of a maximum of 60 ° in the direction of rotation of the tool.
  • the protective hood is thus arranged in its neutral working position at a distance from the stop, so that the stop is effective only when the guard is pivoted about the allowable angle of rotation.
  • a safety margin is given, since in the case of a strong impact on the hood, the hood rotation is first inhibited or braked on the clamping device between clamping collar and bearing surface on the flange, so that until reaching the stop on the friction between the flange and Spanbund energy is dissipated and accordingly the pulse is reduced when reaching the stop.
  • the protective cover is rotated together with the clamping device, being already dissipated energy during this common rotational movement due to the friction between the clamping collar of the guard and the stop surface on the flange. Also in this case, the pulse is thus lower when reaching the stop.
  • the stop element is arranged on a hood body of the protective hood, which engages over the tool of the machine tool.
  • the hood body is formed part-circular in the rule, wherein the stop member advantageously protrudes angularly at an end edge of the hood body and extends in particular in the axial direction.
  • the stop element is expediently formed integrally with the protective hood.
  • the stop element is arranged on the clamping collar of the protective hood and in particular is designed in one piece with the clamping collar.
  • the stop element protrudes, for example, angularly on the clamping collar, such that a portion of the stop element extends parallel to the outer wall of the clamping collar in the axial direction.
  • a design as a stop hook on the outer wall of the clamping collar, wherein a portion of the stop hook extends in the circumferential direction of the clamping collar.
  • Machine or housing side also come different versions for the counterpart into consideration, which is part of the stop device and on which the stop element, which is arranged on the guard, strikes.
  • the counterpart according to the invention is arranged on the clamping device, which serves for clamping the clamping collar of the protective hood on the flange.
  • the clamping device is advantageously positively or non-positively secured against rotation on the flange. This is done for example by screwing the clamping device on the flange or on the housing or another machine-side component.
  • the counterpart is formed, for example, on an actuating device which serves to clamp the clamping device.
  • the counterpart is arranged on the flange or on the housing of the machine tool.
  • the counterpart is designed, for example, as a component protruding beyond the lateral surface of the flange, which component lies in the path of rotation of the stop element, which is formed on the protective hood.
  • the counterpart is designed as the end of a receiving groove, in which the stop element protrudes on the protective hood.
  • the stop element can be pivoted so far in the receiving groove until the counterpart forming groove end is reached.
  • the stop device comprises a damping element.
  • the damping element absorbs rotational energy of the protective hood and thereby leads to a reduction of the pulse at the moment of striking the stop element on the counterpart.
  • the damping element is either carried out in one piece with one of the stop partners or as a separate component, which is integrated in the stop travel between stop element and counterpart.
  • Basically come spring elements, rubber elements or other components as damping elements into consideration, which are suitable due to their structural design or their material properties to absorb energy.
  • the flange is provided on its collar with a profiling on which the inside of the clamping collar of the protective hood with corresponding profiling rests positively.
  • hand tool 1 shown is an angle grinder with an electric drive motor in a housing 2, wherein the drive movement of the electric drive motor is transmitted via a gear 3 to an orthogonal to the motor shaft output shaft 4, with a tool forming a grinding wheel 5 releasably connect is.
  • the hand tool 1 has a protective hood 6, consisting of an at least approximately semicircular hood body 7, which is approximately parallel to the grinding wheel 5 in the mounted position, a clamping collar 8 and a peripheral edge region 9 on the hood body 7.
  • the hood body 7, the clamping collar 8 and Edge region 9 are made in one piece.
  • the protective cover 6 is detachably connected to the power tool 1.
  • An angular stop element 10 is integrally formed in the region of an end edge of the hood body 7; the stop element is located radially in the region between the clamping collar 8 and the radially outer edge region 9.
  • the stop element 10 bent at an angle extends at least approximately in the axial direction of the output shaft 4.
  • the clamping collar 8 with the protective hood 6 is pushed onto a machine-side flange 11 with a flange neck which has a cylindrical lateral surface which forms a contact surface 12 for the clamping collar 8.
  • a clamp 13 is provided, which is placed around the clamping collar 8 and a screw 14, which forms an actuator is put under tension, so that the clamping collar 8 of the clamp 13 with a radial Clamping force against the contact surface 12 on the flange 11 is pressed.
  • the stop element on the protective hood 6 is located on the side facing away from the edge region 9 and together with a radially outwardly directed, the screw 14 receiving portion of the clamp 13 is a stop device for limiting the rotation of the protective hood to the Axle of the output shaft 4.
  • the radially outwardly facing, the screw 14 receiving portion here forms a counterpart 15 to the stop element 10;
  • the abutment means thus consists of the stop member 10 and the counterpart 15.
  • the stop element 10 In the neutral working position, the stop element 10 is located on the protective cover 6 at a distance from the counterpart 15 on the clamp 13.
  • the angular distance is a maximum of 60 °. In the case of a high force on the protective cover 6, this can rotate about the axis of the output shaft 4 on the flange 11 until the stop element 10 comes into contact with the counterpart 15 on the clamp 13. Upon reaching the stop further rotation of the guard against the flange is excluded.
  • Fig. 2 are the protective cover 6 and the flange 11 shown again in detail.
  • the stop element 10 at the front end edge of the hood body 7 is located radially approximately in the middle between the clamping collar 8 and the outer edge region 9.
  • the stop element 10 extends in the axial direction so far that on the one hand a secure system lying on the axially below the guard Counterpart 15 on the clamp 13 is possible and on the other hand, the guard 7 in the event of a high external force until the stop can be freely pivoted on the flange 11.
  • Fig. 3 a variant embodiment is shown, in which the stop element is designed in one piece with the clamping collar 8 on the protective cover 6.
  • the stop element 8 is formed angularly and connected to the edge region 9 facing end side with the clamping collar 8. A portion of the stop element extends from the end side, starting in the axial direction and is located at a radial distance from the outer surface of the clamping collar. 8
  • the stop element 10 is integrally formed with the outer wall of the clamping collar 8 on the protective cover 6.
  • the stop element 10 forms a stop hook, wherein the free hook portion is at a radial distance from the outer surface of the clamping collar 8 and extends at least approximately in the circumferential direction.
  • the stop element 10 is located axially at a distance from both end faces of the chip collar 8.
  • the counterpart to the stop element 10 forms a Schellennut 16, which is introduced into the clamp 13 and extends in the circumferential direction.
  • the stop is formed by the groove end of the clip groove, in which the stop element 10 is guided.
  • struts 17 extending in the axial direction are provided, which engage over the clamp groove 16.
  • the struts 17 are arcuate in order to allow a collision-free sliding along the stop element 10 in the Schellennut 16.
  • the clip groove 16 tapers toward the groove end to decelerate the guard movement prior to reaching the groove end.
  • the guided in the Schellennut stop element 10 experiences by the tapered Schellnut a clamping force which causes the braking operation.
  • a braking in a relative rotational movement of the protective cover 6 about the axis of the output shaft 4 can also be achieved that the Schellennut 16 is not at a constant distance to the foot of the flange 11, but reduced towards the Nutende towards the axial distance to the Flanschfuß, so that with increasing Rotation of the protective cover 6, the lower end face of the clamping collar 8 rests on the flange and is decelerated there due to the resulting frictional force. Even by changing the radial distance of the Schellennut to the contact surface of the flange braking can be achieved.
  • Fig. 5 another embodiment is shown.
  • the clamp 13 is carried out in a conventional manner and is fastened to its radially projecting collar via the screw 14 on the contact surface 12 of the flange 11.
  • the guide of the protective hood via a flange groove 18, which is introduced in the region of the contact surface 12 in the flange 11.
  • In the upper section of the Flange 11 is an axially extending insertion opening 19, which extends from the upper end face of the flange to the flanged groove 18.
  • a radially inwardly directed stop element is formed on the inner side of the clamping collar, for example a pin which is slid axially over the insertion opening 19 onto the flange 11 until it reaches the flanged groove 18 during assembly.
  • the pin slides in the flange groove 18 along and moves away from the axial insertion opening 19, whereby an axial locking is achieved.
  • the twisting movement of the guard is limited by stops in the flange groove 18, in particular by the groove end of the flange groove 18th
  • an element 15 is arranged as a counterpart to the stop element on the guard.
  • the associated stop element on the protective cover is expediently located on the inner side of the clamping collar.
  • a groove 20 is introduced, projects into the mounted position in an axially projecting stop element on the protective hood, in particular on the front side of the clamping collar. Upon rotation of the protective cover, the stop element can travel in the groove 20 until reaching the groove end, which forms the counterpart.
  • Fig. 8 forms the radially projecting collar of the clamp 13 and designed as a screw 14 actuator for tensioning the clamp the counterpart 15 to the stop element on the guard.
  • the screw 14 is screwed to the gear housing 21 of the machine tool, so that the clamp 13 is immovably fixed to the housing of the machine tool and a Relatiwerwindung the clamp around the contact surface of the flange 11 is excluded even with a high force in the event of pivoting of the guard.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Motor Or Generator Frames (AREA)
  • Sawing (AREA)

Description

Die Erfindung bezieht sich auf eine Werkzeugmaschine, insbesondere einen Winkelschleifer, mit einer ein Werkzeug überdeckenden Schutzhaube, nach dem Oberbegriff des Anspruches 1.The invention relates to a machine tool, in particular an angle grinder, with a tool covering a protective hood, according to the preamble of claim 1.

Stand der TechnikState of the art

Aus der WO 2009/054275 A1 ist eine Werkzeugmaschine mit rotierendem Werkzeug in Form einer Schleifscheibe bekannt, die von einer Schutzhaube übergriffen ist, welche an einem maschinenseitigen Flansch befestigt ist. Die Schutzhaube weist einen Spannbund auf, der auf den Flansch aufsetzbar ist und mithilfe einer Spannschelle an dem Flansch befestigt wird. Die Schutzhaube kann in verschiedenen Winkelpositionen an dem Flansch fixiert werden. Zum Ändern der Winkelposition wird die Spannschelle gelockert, woraufhin die Schutzhaube in die gewünschte Lage verschwenkt werden kann. Der Verschwenkbereich ist auf einen definierten Winkelbereich eingeschränkt; hierfür ist eine Anschlagseinrichtung an der Werkzeugmaschine angeordnet, bestehend aus einem Vorsprung an der Spannschelle und einem Gegenstück am Gehäuse der Werkzeugmaschine. Die Spannschelle bildet mit der Schutzhaube ein gemeinsames Bauteil, so dass bei einem Verdrehen der Schutzhaube auch die Spannschelle bis zum Erreichen des Gegenstücks am Gehäuse der Werkzeugmaschine verdreht wird.From the WO 2009/054275 A1 a machine tool with a rotating tool in the form of a grinding wheel is known, which is overlapped by a protective hood, which is attached to a machine-side flange. The protective cover has a clamping collar, which can be placed on the flange and is fastened to the flange by means of a clamp. The guard can be fixed in different angular positions on the flange. To change the angular position, the clamp is loosened, after which the guard can be pivoted to the desired position. The pivoting range is limited to a defined angle range; For this purpose, a stop device is arranged on the machine tool, consisting of a projection on the clamp and a counterpart on the housing of the machine tool. The clamp forms with the guard a common component, so that upon rotation of the guard and the clamp is rotated until it reaches the counterpart on the housing of the machine tool.

Die Einteiligkeit von Spannschelle und Schutzhaube stellt eine verhältnismäßig aufwändige Ausführung dar. Außerdem ist diese Ausführung nicht geeignet, im Falle eines Bruchs des scheibenförmigen Werkzeugs die Verdrehung der Schutzhaube zuverlässig auf einen maximal zulässigen Winkelbetrag zu begrenzen. Aufgrund der verhältnismäßig großen Masse der Schutzhaube besteht die Gefahr, dass trotz des Erreichens des Anschlags über die Anschlagseinrichtung an der Spannschelle der Haubenkörper sich durch die Wirkung der Trägheitskräfte über den zulässigen Winkelbereich hinausgehend verdreht.The one-piece clamp and guard provides a relatively complex design. Moreover, this embodiment is not suitable to reliably limit the rotation of the guard in a case of breakage of the disc-shaped tool to a maximum allowable angle. Due to the relatively large mass of the guard there is a risk that despite reaching the stop on the stop device on the clamp of the hood body is rotated beyond the allowable angle range by the action of the inertial forces.

Die DE 10 2007 057 032 A1 offenbart eine Handwerkzeugmaschine mit einer Schutzhaube mit einem Aufnahmebund, der zugleich ein Spannband bildet und auf einen Flanschhals der Werkzeugmaschine aufsetzbar ist. An dem Spannband befindet sich ein Anschlag, der mit einem gehäuseseitigen Gegenanschlag zusammenwirkt.The DE 10 2007 057 032 A1 discloses a hand tool with a protective hood with a receiving collar, which also forms a clamping band and can be placed on a flange neck of the machine tool. On the strap is a stop, which cooperates with a housing-side counter-stop.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt die Aufgabe zugrunde, die Sicherheit im Falle eines Werkzeugbruchs an einer Werkzeugmaschine zu erhöhen.The invention has for its object to increase safety in the event of tool breakage on a machine tool.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Anspruches 1 gelöst. Die Unteransprüche geben zweckmäßige Weiterbildungen an.This object is achieved with the features of claim 1. The dependent claims indicate expedient developments.

Bei der erfindungsgemäßen Werkzeugmaschine handelt es sich vorzugsweise um eine handgeführte Werkzeugmaschine, insbesondere um ein Elektrohandwerkzeug wie beispielsweise ein Winkelschleifer, dessen Werkzeug zumindest teilweise von einer Schutzhaube überdeckt ist, welche mit einem Spannbund versehen ist, dessen Drehachse koaxial zur Mittelachse der Werkzeugwelle liegt. Der Spannbund ist beispielsweise zylindrisch oder facettiert mit durchgehender bzw. geschlossener oder durchbrochener bzw. segmentierter Mantelfläche versehen. Mittels einer Spanneinrichtung wird der Spannbund der Schutzhaube an einem maschinenseitigen Flansch befestigt, der zu diesem Zweck eine Anlagefläche für den Spannbund aufweist. Über die Spanneinrichtung wird der Spannbund mit einer radialen Klemmkraft gegen die Anlagefläche an dem maschinenseitigen Flansch kraftbeaufschlagt.The machine tool according to the invention is preferably a hand-held machine tool, in particular an electric hand tool such as an angle grinder whose tool is at least partially covered by a protective hood, which is provided with a clamping collar whose axis of rotation is coaxial with the central axis of the tool shaft. The clamping collar is provided, for example, cylindrical or faceted with continuous or closed or perforated or segmented lateral surface. By means of a clamping device, the clamping collar of the guard is attached to a machine-side flange, which has a contact surface for the clamping collar for this purpose. About the clamping device of the clamping collar with a radial clamping force against the contact surface on the machine side flange is subjected to force.

Des Weiteren ist im Übertragungsweg zwischen der Schutzhaube und dem Flansch eine Anschlagseinrichtung vorgesehen, welche die relative Drehbewegung zwischen Schutzhaube und Flansch auf ein zulässiges Maß begrenzt. Erfindungsgemäß ist vorgesehen, dass die Anschlagseinrichtung ein Anschlagselement an der Schutzhaube umfasst, das in Anschlagsposition an einem zugeordneten Gegenstück am Flansch bzw. eine mit dem Gehäuse der Werkzeugmaschine verbundenen Bauteil anliegt. Die Schutzhaube und die Spanneinrichtung sind hierbei als separate Bauteile ausgeführt.Furthermore, a stop device is provided in the transmission path between the guard and the flange, which limits the relative rotational movement between the guard and flange to an acceptable level. According to the invention, it is provided that the stop device comprises a stop element on the protective hood, in the stop position an associated counterpart on the flange or a component connected to the housing of the machine tool is applied. The protective hood and the clamping device are designed here as separate components.

Diese Ausführung weist gegenüber dem Stand der Technik verschiedene Vorteile auf. Zum einen bilden die Schutzhaube und die Spanneinrichtung - in der Regel eine Spannschelle - separate Bauteile, so dass die Schutzhaube ohne Funktionseinbuße einfacher hergestellt werden kann. Die Spanneinrichtung als separates Bauteil beaufschlagt die Schutzhaube im Bereich des Spannbundes und drückt diesen gegen die Anlagefläche am maschinenseitigen bzw. gehäuseseitigen Flansch der Werkzeugmaschine.This embodiment has several advantages over the prior art. First, the guard and the clamping device - usually a clamp - separate components, so that the guard without loss of function can be made easier. The clamping device as a separate component acts on the protective cover in the region of the clamping collar and presses it against the contact surface on the machine-side or housing-side flange of the machine tool.

Des Weiteren ist es vorteilhaft, dass das Anschlagselement unmittelbar an der Schutzhaube angeordnet ist, wodurch zum einen sichergestellt ist, dass das Anschlagselement mit einem hinreichenden Abstand zur Drehachse durch den Spannbund der Schutzhaube liegt und somit bei einem gegebenen Moment geringere Kräfte auf das Anschlagselement wirken. Zum andern erfolgt eine unmittelbare Kraftübertragung zwischen der Schutzhaube und dem Gegenstück der Anschlagseinrichtung ohne zwischengeschaltete Bauelemente, so wie dies im Stand der Technik der Fall ist. Aufgrund der unmittelbaren, direkten Kraftübertragung ist die Bruchgefahr durch den übertragenen Impuls mit dem Erreichen des Anschlags reduziert.Furthermore, it is advantageous that the stop element is arranged directly on the guard, which on the one hand ensures that the stop element is at a sufficient distance from the axis of rotation through the clamping collar of the guard and thus act at a given moment lower forces on the stop member. On the other hand, there is an immediate power transmission between the protective hood and the counterpart of the stop device without intermediate components, as is the case in the prior art. Due to the direct, direct power transmission, the risk of breakage is reduced by the transmitted pulse with the arrival of the attack.

Schließlich ist die Funktionstüchtigkeit der Anschlagseinrichtung unabhängig von der Spanneinrichtung gewährleistet, so dass auch im Falle eines Versagens der Spanneinrichtung die Schutzhaube nur bis zum Erreichen des Anschlags verdreht werden kann.Finally, the functionality of the stop device is ensured independently of the clamping device, so that even in the case of failure of the clamping device, the guard can only be rotated until reaching the stop.

Gemäß einer vorteilhaften Ausführung ist vorgesehen, dass die Schutzhaube in einer neutralen Arbeitsposition in Drehrichtung einen Verdrehbereich bis zum Anschlag der Anschlagseinrichtung aufweist. Die neutrale Arbeitsposition ist definiert durch parallele Ausrichtung der Symmetrieachse des Haubenkörpers mit der Ankerlängsachse des elektrischen Antriebsmotors. Von dieser neutralen Arbeitsposition ausgehend besteht in Drehrichtung des Werkzeugs zweckmäßigerweise ein Verdrehbereich von maximal 60°.According to an advantageous embodiment, it is provided that the protective hood in a neutral working position in the direction of rotation has a twisting area up to the stop of the stop device. The neutral working position is defined by parallel alignment of the axis of symmetry of the hood body with the armature longitudinal axis of the electric drive motor. Starting from this neutral working position, there is expediently a turning range of a maximum of 60 ° in the direction of rotation of the tool.

Die Schutzhaube ist somit in ihrer neutralen Arbeitsposition auf Abstand zum Anschlag angeordnet, so dass der Anschlag erst wirksam wird, wenn die Schutzhaube um den zulässigen Verdrehwinkel verschwenkt wird. Auf diese Weise ist eine Sicherheitsreserve gegeben, da im Falle einer starken Einwirkung auf die Schutzhaube die Haubenverdrehung zunächst über die Spanneinrichtung zwischen Spannbund und Lagefläche am Flansch gehemmt bzw. gebremst wird, so dass bis zum Erreichen des Anschlags über die Reibung zwischen Flansch und Spannbund Energie abgebaut wird und dementsprechend der Impuls beim Erreichen des Anschlages reduziert ist.The protective hood is thus arranged in its neutral working position at a distance from the stop, so that the stop is effective only when the guard is pivoted about the allowable angle of rotation. In this way, a safety margin is given, since in the case of a strong impact on the hood, the hood rotation is first inhibited or braked on the clamping device between clamping collar and bearing surface on the flange, so that until reaching the stop on the friction between the flange and Spanbund energy is dissipated and accordingly the pulse is reduced when reaching the stop.

Möglich ist es aber auch, dass die Schutzhaube gemeinsam mit der Spanneinrichtung verdreht wird, wobei bereits während dieser gemeinsamen Drehbewegung Energie aufgrund der Reibung zwischen dem Spannbund der Schutzhaube und der Anschlagsfläche am Flansch dissipiert wird. Auch in diesem Fall ist somit der Impuls bei Erreichen des Anschlags geringer.But it is also possible that the protective cover is rotated together with the clamping device, being already dissipated energy during this common rotational movement due to the friction between the clamping collar of the guard and the stop surface on the flange. Also in this case, the pulse is thus lower when reaching the stop.

Gemäß einer weiteren zweckmäßigen Ausführung ist vorgesehen, dass das Anschlagselement an einem Haubenkörper der Schutzhaube angeordnet ist, welche das Werkzeug der Werkzeugmaschine übergreift. Der Haubenkörper ist in der Regel teilkreisförmig ausgebildet, wobei das Anschlagselement vorteilhafterweise an einer Stirnkante des Haubenkörpers winkelförmig übersteht und sich insbesondere in Achsrichtung erstreckt. Das Anschlagselement ist zweckmäßigerweise einteilig mit der Schutzhaube ausgebildet.According to a further expedient embodiment, it is provided that the stop element is arranged on a hood body of the protective hood, which engages over the tool of the machine tool. The hood body is formed part-circular in the rule, wherein the stop member advantageously protrudes angularly at an end edge of the hood body and extends in particular in the axial direction. The stop element is expediently formed integrally with the protective hood.

Gemäß einer weiteren Ausführung ist vorgesehen, dass das Anschlagselement am Spannbund der Schutzhaube angeordnet ist und insbesondere einteilig mit dem Spannbund ausgeführt ist. Das Anschlagselement ragt beispielsweise winkelförmig am Spannbund ab, derart, dass ein Abschnitt des Anschlagselements sich parallel zur Außenwand des Spannbundes in Achsrichtung erstreckt. Möglich ist aber auch eine Ausführung als Anschlagshaken an der Außenwand des Spannbundes, wobei ein Abschnitt des Anschlagshakens sich in Umfangsrichtung des Spannbundes erstreckt.According to a further embodiment it is provided that the stop element is arranged on the clamping collar of the protective hood and in particular is designed in one piece with the clamping collar. The stop element protrudes, for example, angularly on the clamping collar, such that a portion of the stop element extends parallel to the outer wall of the clamping collar in the axial direction. However, it is also possible to use a design as a stop hook on the outer wall of the clamping collar, wherein a portion of the stop hook extends in the circumferential direction of the clamping collar.

Maschinen- bzw. gehäuseseitig kommen ebenfalls verschiedene Ausführungen für das Gegenstück in Betracht, welches Bestandteil der Anschlagseinrichtung ist und an dem das Anschlagselement, welches an der Schutzhaube angeordnet ist, anschlägt. So ist das Gegenstück erfindungsgemäß an der Spanneinrichtung angeordnet, die zum Festklemmen des Spannbundes der Schutzhaube an dem Flansch dient. Um jedoch sicherzugehen, dass im Falle hoher Krafteinwirkung das Gegenstück an der Spanneinrichtung die Impulskräfte beim Anschlagen des Anschlagselementes aufnimmt, ist die Spanneinrichtung vorteilhafterweise form- oder kraftschlüssig gegen ein Verdrehen am Flansch gesichert. Dies erfolgt beispielsweise über ein Verschrauben der Spanneinrichtung am Flansch oder am Gehäuse bzw. einem sonstigen maschinenseitigen Bauteil. Das Gegenstück ist beispielsweise an einer Betätigungseinrichtung ausgebildet, die zum Spannen der Spanneinrichtung dient.Machine or housing side also come different versions for the counterpart into consideration, which is part of the stop device and on which the stop element, which is arranged on the guard, strikes. Thus, the counterpart according to the invention is arranged on the clamping device, which serves for clamping the clamping collar of the protective hood on the flange. However, to ensure that in the case of high force the counterpart on the clamping device absorbs the momentum forces when striking the stop element, the clamping device is advantageously positively or non-positively secured against rotation on the flange. This is done for example by screwing the clamping device on the flange or on the housing or another machine-side component. The counterpart is formed, for example, on an actuating device which serves to clamp the clamping device.

Gemäß einer weiteren Ausführung ist vorgesehen, dass das Gegenstück am Flansch oder am Gehäuse der Werkzeugmaschine angeordnet ist. Im Falle einer Ausführung am Flansch ist das Gegenstück beispielsweise als ein über die Mantelfläche des Flansches überstehendes Bauteil ausgeführt, das im Verdrehweg des Anschlagselementes liegt, welches an der Schutzhaube ausgebildet ist.According to a further embodiment it is provided that the counterpart is arranged on the flange or on the housing of the machine tool. In the case of a design on the flange, the counterpart is designed, for example, as a component protruding beyond the lateral surface of the flange, which component lies in the path of rotation of the stop element, which is formed on the protective hood.

Gemäß einer weiteren Ausführung ist vorgesehen, dass das Gegenstück als das Ende einer Aufnahmenut ausgeführt ist, in die das Anschlagselement an der Schutzhaube einragt. Das Anschlagselement kann in der Aufnahmenut so weit verschwenkt werden, bis das das Gegenstück bildende Nutende erreicht ist.According to a further embodiment it is provided that the counterpart is designed as the end of a receiving groove, in which the stop element protrudes on the protective hood. The stop element can be pivoted so far in the receiving groove until the counterpart forming groove end is reached.

Gemäß noch einer weiteren zweckmäßigen Ausführung ist vorgesehen, dass die Anschlagseinrichtung ein Dämpfungselement umfasst. Das Dämpfungselement absorbiert Rotationsenergie der Schutzhaube und führt dadurch zu einer Reduzierung des Impulses im Augenblick des Anschlagens des Anschlagselementes am Gegenstück. Das Dämpfungselement ist entweder einteilig mit einem der Anschlagspartner ausgeführt oder als separates Bauteil, welches in den Anschlagsweg zwischen Anschlagselement und Gegenstück integriert ist. Grundsätzlich kommen Federelemente, Gummielemente oder sonstige Bauteile als Dämpfungselemente in Betracht, die aufgrund ihres konstruktiven Aufbaus oder ihrer Materialbeschaffenheit geeignet sind, Energie zu absorbieren. Beispielsweise ist es auch möglich, das Dämpfungselement nach Art einer Knautschzone mit einem Verformungsabschnitt auszuführen, der sich elastisch oder plastisch verformt und hierdurch Bewegungsenergie abbaut.According to yet another expedient embodiment, it is provided that the stop device comprises a damping element. The damping element absorbs rotational energy of the protective hood and thereby leads to a reduction of the pulse at the moment of striking the stop element on the counterpart. The damping element is either carried out in one piece with one of the stop partners or as a separate component, which is integrated in the stop travel between stop element and counterpart. Basically come spring elements, rubber elements or other components as damping elements into consideration, which are suitable due to their structural design or their material properties to absorb energy. For example, it is also possible to carry out the damping element in the manner of a crumple zone with a deformation section which deforms elastically or plastically and thereby degrades kinetic energy.

In einer weiteren vorteilhaften Ausführung ist der Flansch an seinem Bund mit einer Profilierung versehen ist, an der die Innenseite des Spannbundes der Schutzhaube mit korrespondierender Profilierung formschlüssig anliegt. Der Vorteil dieser Ausführung ist, dass bei einem Durchrutschen der Schutzhaube bereits an der Profilierung Bewegungsenergie abgebaut wird, bevor der Anschlag erreicht wird. Außerdem wird durch das Spannen der Spanneinrichtung, die um den Spannbund der Schutzhaube gelegt ist, welcher sandwichartig zwischen Spanneinrichtung und Flansch liegt, eine radiale Klemmkraft generiert, die die Profilierungen in der ineinandergreifenden, formschlüssigen Position halten. Dies ermöglicht es, die radiale Höhe der Profilierung ohne Einschränkung des Energieabbaus verhältnismäßig gering zu halten.In a further advantageous embodiment, the flange is provided on its collar with a profiling on which the inside of the clamping collar of the protective hood with corresponding profiling rests positively. The advantage of this design is that with a slipping of the guard already on the profiling kinetic energy is dissipated before the stop is reached. In addition, by clamping the clamping device, which is placed around the clamping collar of the guard, which sandwiched between Clamping device and flange is generated, a radial clamping force that hold the profilings in the intermeshing, positive position. This makes it possible to keep the radial height of the profiling relatively low without limiting the energy dissipation.

Weitere Vorteile und zweckmäßige Ausführungen sind den weiteren Ansprüchen, der Figurenbeschreibung und den Zeichnungen zu entnehmen. Es zeigen:

Fig. 1
eine perspektivische Ansicht einer als Winkelschleifer ausgebildeten Werkzeugmaschine, mit einer Schleifscheibe und einer Schutzhaube in Explosionsdarstellung,
Fig. 2
in Einzeldarstellung ein maschinenseitiger Flansch mit einer Spannschelle und einer Schutzhaube, die mit ihrem Spannbund auf den Flansch aufsetzbar ist, wobei am Haubenkörper der Schutzhaube ein Anschlagselement angeformt ist,
Fig. 3
ein weiteres Ausführungsbeispiel, bei dem der Anschlag am Spannbund der Schutzhaube angeformt ist,
Fig. 4
ein Ausführungsbeispiel mit einem hakenförmigen Anschlagselement am Spannbund,
Fig. 5
der maschinenseitige Flansch einschließlich einer Spannschelle in einer weiteren Ausführung,
Fig. 6
ein Ausschnitt aus dem maschinenseitigen Flansch mit darauf angeordnetem Gegenstück,
Fig. 7
eine weitere Ausführung eines Flansches mit einer am Fuß des Flansches eingebrachten Aufnahmenut zur Aufnahme eines Anschlagselementes an der Schutzhaube,
Fig. 8
eine Darstellung einer am Getriebegehäuse der Werkzeugmaschine verschraubten Spannschelle.
Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:
Fig. 1
a perspective view of an angle grinder designed as a machine tool, with a grinding wheel and a protective hood in an exploded view,
Fig. 2
in detail a machine-side flange with a clamp and a protective hood, which is placed with its clamping collar on the flange, wherein on the hood body of the protective hood a stop element is formed,
Fig. 3
a further embodiment in which the stop on the clamping collar of the protective hood is formed,
Fig. 4
an embodiment with a hook-shaped stop element on the clamping collar,
Fig. 5
the machine-side flange including a clamp in a further embodiment,
Fig. 6
a section of the machine-side flange with a counterpart arranged thereon,
Fig. 7
a further embodiment of a flange with an introduced at the foot of the flange receiving groove for receiving a stop element on the guard,
Fig. 8
a representation of a screwed on the gear housing of the machine tool clamp.

In den Figuren sind gleiche Bauteile mit gleichen Bezugszeichen versehen.In the figures, the same components are provided with the same reference numerals.

Bei der in Fig. 1 dargestellten Handwerkzeugmaschine 1 handelt es sich um einen Winkelschleifer mit einem elektrischen Antriebsmotor in einem Gehäuse 2, wobei die Antriebsbewegung des elektrischen Antriebsmotors über ein Getriebe 3 auf eine orthogonal zur Motorwelle stehenden Abtriebswelle 4 übertragen wird, mit der eine ein Werkzeug bildende Schleifscheibe 5 lösbar zu verbinden ist. Die Handwerkzeugmaschine 1 weist eine Schutzhaube 6 auf, bestehend aus einem zumindest annährend halbkreisförmigen Haubenkörper 7, der in montierter Position etwa parallel zur Schleifscheibe 5 liegt, einem Spannbund 8 und einem umlaufenden Randbereich 9 am Haubenkörper 7. Der Haubenkörper 7, der Spannbund 8 und der Randbereich 9 sind einteilig ausgeführt. Über den Spannbund 8 wird die Schutzhaube 6 lösbar mit der Handwerkzeugmaschine 1 verbunden.At the in Fig. 1 hand tool 1 shown is an angle grinder with an electric drive motor in a housing 2, wherein the drive movement of the electric drive motor is transmitted via a gear 3 to an orthogonal to the motor shaft output shaft 4, with a tool forming a grinding wheel 5 releasably connect is. The hand tool 1 has a protective hood 6, consisting of an at least approximately semicircular hood body 7, which is approximately parallel to the grinding wheel 5 in the mounted position, a clamping collar 8 and a peripheral edge region 9 on the hood body 7. The hood body 7, the clamping collar 8 and Edge region 9 are made in one piece. About the clamping collar 8, the protective cover 6 is detachably connected to the power tool 1.

Im Bereich einer Stirnkante des Haubenkörpers 7 ist ein winkliges Anschlagselement 10 stückig angeformt, das Anschlagselement befindet sich radial im Bereich zwischen dem Spannbund 8 und dem radial außen liegenden Randbereich 9. Das winklig abgebogene Anschlagselement 10 erstreckt sich zumindest annähernd in Achsrichtung der Abtriebswelle 4.An angular stop element 10 is integrally formed in the region of an end edge of the hood body 7; the stop element is located radially in the region between the clamping collar 8 and the radially outer edge region 9. The stop element 10 bent at an angle extends at least approximately in the axial direction of the output shaft 4.

In der montierten Position ist der Spannbund 8 mit der Schutzhaube 6 auf einen maschinenseitigen Flansch 11 mit einem Flanschhals aufgeschoben, der eine zylindrische Mantelfläche aufweist, welche eine Anlagefläche 12 für den Spannbund 8 bildet. Zur Befestigung der Schutzhaube 6 an der Handwerkzeugmaschine 1 ist eine Spannschelle 13 vorgesehen, die um den Spannbund 8 gelegt ist und über eine Schraube 14, die eine Betätigungseinrichtung bildet, unter Spannung gesetzt wird, so dass der Spannbund 8 von der Spannschelle 13 mit einer radialen Klemmkraft gegen die Anlagefläche 12 am Flansch 11 gedrückt wird.In the mounted position, the clamping collar 8 with the protective hood 6 is pushed onto a machine-side flange 11 with a flange neck which has a cylindrical lateral surface which forms a contact surface 12 for the clamping collar 8. To attach the protective cover 6 to the power tool 1, a clamp 13 is provided, which is placed around the clamping collar 8 and a screw 14, which forms an actuator is put under tension, so that the clamping collar 8 of the clamp 13 with a radial Clamping force against the contact surface 12 on the flange 11 is pressed.

Als Betätigungseinrichtung zum Spannen der Spanneinrichtung kommt auch ein Spannhebel in Betracht.As an actuating device for clamping the clamping device is also a clamping lever into consideration.

Das Anschlagselement an der Schutzhaube 6 befindet sich auf der dem Randbereich 9 abgewandten Seite und bildet gemeinsam mit einem radial nach außen gerichteten, die Schraube 14 aufnehmenden Abschnitt der Spannschelle 13 eine Anschlagseinrichtung zur Begrenzung der Verdrehung der Schutzhaube um die Achse der Abtriebswelle 4. Der radial nach außen weisende, die Schraube 14 aufnehmende Abschnitt bildet hierbei ein Gegenstück 15 zum Anschlagselement 10; die Anschlagseinrichtung besteht somit aus dem Anschlagselement 10 und dem Gegenstück 15. Beim Anschlagen des Anschlagselements 10 am Gegenstück 15 kommt das Anschlagselement 10 mit dem Kopf der Schraube 14 in Kontakt, so dass die Schraube 14 als Betätigungseinrichtung der Spannschelle im weiteren Sinne ebenfalls zum Gegenstück 15 gerechnet werden kann.The stop element on the protective hood 6 is located on the side facing away from the edge region 9 and together with a radially outwardly directed, the screw 14 receiving portion of the clamp 13 is a stop device for limiting the rotation of the protective hood to the Axle of the output shaft 4. The radially outwardly facing, the screw 14 receiving portion here forms a counterpart 15 to the stop element 10; The abutment means thus consists of the stop member 10 and the counterpart 15. When striking the stop member 10 on the counterpart 15, the stop member 10 comes into contact with the head of the screw 14, so that the screw 14 as an actuating device of the clamp in a broader sense also to the counterpart 15th can be expected.

In der neutralen Arbeitsposition liegt das Anschlagselement 10 an der Schutzhaube 6 auf Abstand zum Gegenstück 15 an der Spannschelle 13. Der Winkelabstand beträgt maximal 60°. Im Falle einer hohen Krafteinwirkung auf die Schutzhaube 6 kann diese sich um die Achse der Abtriebswelle 4 am Flansch 11 verdrehen, bis das Anschlagselement 10 in Kontakt mit dem Gegenstück 15 an der Spannschelle 13 gelangt. Mit Erreichen des Anschlags ist eine weitere Verdrehung der Schutzhaube gegenüber dem Flansch ausgeschlossen.In the neutral working position, the stop element 10 is located on the protective cover 6 at a distance from the counterpart 15 on the clamp 13. The angular distance is a maximum of 60 °. In the case of a high force on the protective cover 6, this can rotate about the axis of the output shaft 4 on the flange 11 until the stop element 10 comes into contact with the counterpart 15 on the clamp 13. Upon reaching the stop further rotation of the guard against the flange is excluded.

In Fig. 2 sind die Schutzhaube 6 und der Flansch 11 nochmals in Einzeldarstellung gezeigt. Das Anschlagselement 10 an der vorderen Stirnkante des Haubenkörpers 7 befindet sich radial annähernd in der Mitte zwischen dem Spannbund 8 und dem außen liegenden Randbereich 9. Das Anschlagselement 10 erstreckt sich in Achsrichtung so weit, dass einerseits eine sichere Anlage an dem axial unterhalb der Schutzhaube liegenden Gegenstück 15 an der Spannschelle 13 möglich ist und andererseits die Schutzhaube 7 im Falle einer hohen äußeren Krafteinwirkung bis zum Erreichen des Anschlags ungehindert am Flansch 11 verschwenkt werden kann.In Fig. 2 are the protective cover 6 and the flange 11 shown again in detail. The stop element 10 at the front end edge of the hood body 7 is located radially approximately in the middle between the clamping collar 8 and the outer edge region 9. The stop element 10 extends in the axial direction so far that on the one hand a secure system lying on the axially below the guard Counterpart 15 on the clamp 13 is possible and on the other hand, the guard 7 in the event of a high external force until the stop can be freely pivoted on the flange 11.

In Fig. 3 ist eine Ausführungsvariante dargestellt, bei der das Anschlagselement einteilig mit dem Spannbund 8 an der Schutzhaube 6 ausgeführt ist. Das Anschlagselement 8 ist winkelförmig ausgebildet und an der dem Randbereich 9 zugewandten Stirnseite mit dem Spannbund 8 verbunden. Ein Abschnitt des Anschlagselementes erstreckt sich von der Stirnseite ausgehend in Achsrichtung und liegt mit radialem Abstand zur äußeren Mantelfläche des Spannbundes 8.In Fig. 3 a variant embodiment is shown, in which the stop element is designed in one piece with the clamping collar 8 on the protective cover 6. The stop element 8 is formed angularly and connected to the edge region 9 facing end side with the clamping collar 8. A portion of the stop element extends from the end side, starting in the axial direction and is located at a radial distance from the outer surface of the clamping collar. 8

Auf Seiten des Flansches 11 wirkt der radial auskragende Abschnitt der Spannschelle 13 als Gegenstück 15 mit dem Anschlagselement 10 zusammen.On the side of the flange 11 of the radially projecting portion of the clamp 13 acts as a counterpart 15 with the stop element 10 together.

Im Ausführungsbeispiel gemäß Fig. 4 ist das Anschlagselement 10 einteilig mit der Außenwand des Spannbundes 8 an der Schutzhaube 6 ausgebildet. Das Anschlagselement 10 bildet einen Anschlagshaken, wobei der freie Hakenabschnitt auf radialem Abstand zur äußeren Mantelfläche des Spannbundes 8 liegt und sich zumindest annähernd in Umfangsrichtung erstreckt. Das Anschlagselement 10 liegt axial mit Abstand zu beiden Stirnseiten des Spanbundes 8.In the embodiment according to Fig. 4 the stop element 10 is integrally formed with the outer wall of the clamping collar 8 on the protective cover 6. The stop element 10 forms a stop hook, wherein the free hook portion is at a radial distance from the outer surface of the clamping collar 8 and extends at least approximately in the circumferential direction. The stop element 10 is located axially at a distance from both end faces of the chip collar 8.

Das Gegenstück zum Anschlagselement 10 bildet eine Schellennut 16, die in die Spannschelle 13 eingebracht ist und sich in Umfangsrichtung erstreckt. Der Anschlag wird gebildet durch das Nutende der Schellennut, in der das Anschlagselement 10 geführt wird. Zur Stabilisierung der durch die Schellennut geteilten Spannschelle 13 sind sich in Achsrichtung erstreckende Verstrebungen 17 vorgesehen, die die Schellennut 16 übergreifen. Die Verstrebungen 17 sind bogenförmig ausgeführt, um ein kollisionsfreies Entlanggleiten des Anschlagselementes 10 in der Schellennut 16 zu erlauben.The counterpart to the stop element 10 forms a Schellennut 16, which is introduced into the clamp 13 and extends in the circumferential direction. The stop is formed by the groove end of the clip groove, in which the stop element 10 is guided. In order to stabilize the tension clamp 13 divided by the clamp groove, struts 17 extending in the axial direction are provided, which engage over the clamp groove 16. The struts 17 are arcuate in order to allow a collision-free sliding along the stop element 10 in the Schellennut 16.

Gegebenenfalls verjüngt sich die Schellennut 16 zu dem Nutende hin, um die Schutzhaubenbewegung noch vor dem Erreichen des Nutendes abzubremsen. Das in der Schellennut geführte Anschlagselement 10 erfährt durch die sich verjüngende Schellennut eine Klemmkraft, die den Bremsvorgang bewirkt.Optionally, the clip groove 16 tapers toward the groove end to decelerate the guard movement prior to reaching the groove end. The guided in the Schellennut stop element 10 experiences by the tapered Schellnut a clamping force which causes the braking operation.

Ein Abbremsen bei einer Relativdrehbewegung der Schutzhaube 6 um die Achse der Abtriebswelle 4 kann auch dadurch erreicht werden, dass die Schellennut 16 nicht mit konstantem Abstand zum Fuß des Flansches 11 liegt, sondern zum Nutende hin den axialen Abstand zum Flanschfuß verringert, so dass mit zunehmender Verdrehung der Schutzhaube 6 die untere Stirnseite des Spannbundes 8 am Flanschboden aufliegt und dort aufgrund der entstehenden Reibkraft abgebremst wird. Auch durch eine Änderung des radialen Abstandes der Schellennut zur Anlagefläche des Flansches kann ein Abbremsen erreicht werden.A braking in a relative rotational movement of the protective cover 6 about the axis of the output shaft 4 can also be achieved that the Schellennut 16 is not at a constant distance to the foot of the flange 11, but reduced towards the Nutende towards the axial distance to the Flanschfuß, so that with increasing Rotation of the protective cover 6, the lower end face of the clamping collar 8 rests on the flange and is decelerated there due to the resulting frictional force. Even by changing the radial distance of the Schellennut to the contact surface of the flange braking can be achieved.

In Fig. 5 ist ein weiteres Ausführungsbeispiel dargestellt. Die Spannschelle 13 ist in herkömmlicher Weise ausgeführt und wird an ihrem radial auskragenden Bund über die Schraube 14 an der Anlagefläche 12 des Flansches 11 befestigt. Die Führung der Schutzhaube erfolgt über eine Flanschnut 18, die im Bereich der Anlagefläche 12 in den Flansch 11 eingebracht ist. Im oberen Abschnitt des Flansches 11 befindet sich eine axial verlaufende Einführöffnung 19, die sich von der oberen Stirnseite des Flansches bis zur Flanschnut 18 erstreckt.In Fig. 5 another embodiment is shown. The clamp 13 is carried out in a conventional manner and is fastened to its radially projecting collar via the screw 14 on the contact surface 12 of the flange 11. The guide of the protective hood via a flange groove 18, which is introduced in the region of the contact surface 12 in the flange 11. In the upper section of the Flange 11 is an axially extending insertion opening 19, which extends from the upper end face of the flange to the flanged groove 18.

Auf Seiten der Schutzhaube ist auf der Spannbundinnenseite ein radial nach innen gerichtetes Anschlagselement ausgebildet, beispielsweise ein Pin, der bei der Montage axial über die Einführöffnung 19 auf den Flansch 11 bis zum Erreichen der Flanschnut 18 aufgeschoben wird. Beim Verdrehen der Schutzhaube 6 gleitet der Pin in der Flanschnut 18 entlang und entfernt sich von der axialen Einführöffnung 19, wodurch eine axiale Verriegelung erreicht wird. Die Verdrehbewegung der Schutzhaube ist über Anschläge in der Flanschnut 18 begrenzt, insbesondere durch das Nutende der Flanschnut 18.On the side of the protective hood, a radially inwardly directed stop element is formed on the inner side of the clamping collar, for example a pin which is slid axially over the insertion opening 19 onto the flange 11 until it reaches the flanged groove 18 during assembly. When rotating the protective cover 6, the pin slides in the flange groove 18 along and moves away from the axial insertion opening 19, whereby an axial locking is achieved. The twisting movement of the guard is limited by stops in the flange groove 18, in particular by the groove end of the flange groove 18th

Im Ausführungsbeispiel gemäß Fig. 6 ist auf der axialen Stirnseite des Flansches 11 innerhalb des Radius der Anlagefläche 12 ein Element 15 als Gegenstück zum Anschlagselement an der Schutzhaube angeordnet. Das zugehörige Anschlagselement an der Schutzhaube befindet sich zweckmäßigerweise an der Spannbundinnenseite.In the embodiment according to Fig. 6 is on the axial end face of the flange 11 within the radius of the contact surface 12, an element 15 is arranged as a counterpart to the stop element on the guard. The associated stop element on the protective cover is expediently located on the inner side of the clamping collar.

Im Ausführungsbeispiel gemäß Fig. 7 ist in den Fußbereich des Flansches 11 eine Nut 20 eingebracht, in die in montierter Position ein axial überstehendes Anschlagselement an der Schutzhaube, insbesondere an der Stirnseite des Spannbundes einragt. Bei einer Verdrehung der Schutzhaube kann das Anschlagselement in der Nut 20 bis zum Erreichen des Nutendes entlang wandern, welches das Gegenstück bildet.In the embodiment according to Fig. 7 is in the foot region of the flange 11, a groove 20 is introduced, projects into the mounted position in an axially projecting stop element on the protective hood, in particular on the front side of the clamping collar. Upon rotation of the protective cover, the stop element can travel in the groove 20 until reaching the groove end, which forms the counterpart.

Im Ausführungsbeispiel gemäß Fig. 8 bildet der radial auskragende Bund der Spannschelle 13 bzw. die als Schraube 14 ausgeführte Betätigungseinrichtung zum Spannen der Spannschelle das Gegenstück 15 zum Anschlagselement an der Schutzhaube. Die Schraube 14 ist mit dem Getriebegehäuse 21 der Werkzeugmaschine verschraubt, so dass die Spannschelle 13 unverrückbar am Gehäuse der Werkzeugmaschine festgelegt ist und eine Relatiwerdrehung der Spannschelle um die Anlagefläche des Flansches 11 auch bei einer hohen Krafteinwirkung im Falle eines Verschwenkens der Schutzhaube ausgeschlossen ist.In the embodiment according to Fig. 8 forms the radially projecting collar of the clamp 13 and designed as a screw 14 actuator for tensioning the clamp the counterpart 15 to the stop element on the guard. The screw 14 is screwed to the gear housing 21 of the machine tool, so that the clamp 13 is immovably fixed to the housing of the machine tool and a Relatiwerdrehung the clamp around the contact surface of the flange 11 is excluded even with a high force in the event of pivoting of the guard.

Claims (15)

  1. Power tool, in particular an angle grinder, having a protective hood (6) which at least partly covers a tool and has a clamping collar (8) which can be fastened to a machine-side flange (11) by means of a clamping device (13), wherein the flange (11) has a bearing surface (12) for the clamping collar (8), and the clamping collar (8) is subjected to a clamping force via the clamping device (13) to press it against the bearing surface (12) on the flange (11), wherein a stop device limiting a relative movement between the protective hood (6) and the flange (11) is provided in the transmission path between the protective hood (6) and the flange (11), which stop device comprises a stop element (10) on the protective hood (6), characterized in that the stop element (10) on the protective hood (6) bears in the stop position against an associated counterpart (15) on a component (13) connected to the housing (2) of the power tool (1), wherein the protective hood (6) and the clamping device (13) are embodied as separate components and the counterpart (15) is arranged on the clamping device (13), wherein the stop element (10) on the protective hood (6) forms a stop with the counterpart (15) on the clamping device.
  2. Power tool according to Claim 1, characterized in that the protective hood (6), in the neutral working position, has a rotary range in the direction of rotation until the counterpart (15) of the stop device is reached.
  3. Power tool according to Claim 1 or 2, characterized in that the stop element (10) is arranged on a hood body (7) overlapping the tool of the power tool (1).
  4. Power tool according to Claim 3, characterized in that the hood body (7) is designed in the shape of a circle segment and the stop element (10) projects in an angular manner on an end edge of the hood body (7).
  5. Power tool according to one of Claims 1 to 3, characterized in that the stop element (10) is arranged on the clamping collar (8) of the protective hood (6).
  6. Power tool according to Claim 5, characterized in that the stop element (10) projects in an angular manner on the clamping collar (8) and a section of the stop element (10) extends parallel to the outer wall of the clamping collar (8).
  7. Power tool according to Claim 5 or 6, characterized in that the stop element (10) is arranged as a stop hook on the outer wall of the clamping collar (8), and a section of the stop hook extends in the circumferential direction of the clamping collar (8).
  8. Power tool according to one of Claims 1 to 7, characterized in that an actuating device on the clamping device (13), which actuating device serves for the tightening, forms the counterpart (15) of the stop device.
  9. Power tool according to one of Claims 1 to 8, characterized in that the counterpart (15) is formed on the flange (11).
  10. Power tool according to Claim 9, characterized in that the counterpart (15) is designed as a component which projects beyond the lateral surface of the flange (11).
  11. Power tool according to one of Claims 1 to 10, characterized in that the counterpart (15) is designed as the end of an accommodating slot (16, 18), into which the stop element (10) on the protective hood (6) projects.
  12. Power tool according to one of Claims 1 to 11, characterized in that the stop device comprises a damping element.
  13. Power tool according to Claim 12, characterized in that the damping element is formed in one piece with the stop element (10) on the protective hood (6) and/or the counterpart (15).
  14. Power tool according to one of Claims 1 to 13, characterized in that the clamping device (13) is locked against rotation on the flange (11) in a positive-locking or frictional manner.
  15. Power tool according to one of Claims 1 to 14, characterized in that the protective hood (6) is arranged so as to be rotatable relative to the clamping device (13).
EP10724080.6A 2009-08-10 2010-06-10 Machine tool having a protective cover Active EP2464494B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910028404 DE102009028404A1 (en) 2009-08-10 2009-08-10 Machine tool with a protective hood
PCT/EP2010/058123 WO2011018254A1 (en) 2009-08-10 2010-06-10 Machine tool having a protective cover

Publications (2)

Publication Number Publication Date
EP2464494A1 EP2464494A1 (en) 2012-06-20
EP2464494B1 true EP2464494B1 (en) 2016-03-30

Family

ID=42340772

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10724080.6A Active EP2464494B1 (en) 2009-08-10 2010-06-10 Machine tool having a protective cover

Country Status (7)

Country Link
US (1) US9085063B2 (en)
EP (1) EP2464494B1 (en)
JP (1) JP5518192B2 (en)
CN (1) CN102470503B (en)
DE (1) DE102009028404A1 (en)
RU (1) RU2550443C2 (en)
WO (1) WO2011018254A1 (en)

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Also Published As

Publication number Publication date
CN102470503B (en) 2015-12-16
US9085063B2 (en) 2015-07-21
WO2011018254A1 (en) 2011-02-17
US20120190280A1 (en) 2012-07-26
DE102009028404A1 (en) 2011-02-17
RU2012108435A (en) 2013-09-20
CN102470503A (en) 2012-05-23
RU2550443C2 (en) 2015-05-10
JP5518192B2 (en) 2014-06-11
JP2013501635A (en) 2013-01-17
EP2464494A1 (en) 2012-06-20

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