EP1741521A1 - Hand tool with protective hood - Google Patents

Hand tool with protective hood Download PDF

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Publication number
EP1741521A1
EP1741521A1 EP06116064A EP06116064A EP1741521A1 EP 1741521 A1 EP1741521 A1 EP 1741521A1 EP 06116064 A EP06116064 A EP 06116064A EP 06116064 A EP06116064 A EP 06116064A EP 1741521 A1 EP1741521 A1 EP 1741521A1
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EP
European Patent Office
Prior art keywords
hand tool
clamping means
device housing
tool according
counter
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.)
Granted
Application number
EP06116064A
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German (de)
French (fr)
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EP1741521B1 (en
Inventor
Louis Widmer
Christian Koschel
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Hilti AG
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Hilti AG
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Publication date
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Publication of EP1741521A1 publication Critical patent/EP1741521A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028Angle tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00Safety 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
    • B24B55/04Protective covers for the grinding wheel
    • B24B55/05Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25FCOMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02Construction of casings, bodies or handles

Definitions

  • the invention relates to a hand tool, in particular an angle grinder, with a motor housing a device housing.
  • a hand tool in particular an angle grinder
  • a motor housing a device housing.
  • a device housing for this protrudes at a housing opening out of the motor driven by a drive shaft tool shaft, on which a disk-shaped tool by means of a tool holder can be fixed.
  • a protective cover for partially covering the tool can be fixed to the device housing.
  • the protective hood is held by a relative to the device housing rotationally fixed axial support in the direction of the drive axis, but it is rotatable about the drive axis.
  • a rotary lock is provided on the device housing, which has a locking position in which it is in the protective hood with locking elements of the protective hood engaged. From this locking position out the rotary lock against the force of a spring in an unlocked position is movable to set the guard in different rotational positions relative to the device housing can.
  • Such hand tooling can be used for various applications, such as grinding or cutting work.
  • the mounting arrangement allows for each application to set a suitable rotational position of the guard relative to the device housing.
  • the twist lock ensures a secure fixing of the guard in the selected rotational position.
  • a disadvantage of the known hand tool that results in a high assembly cost due to the high number of elements that is required for the axial and radial fixing of the protective cover on the device housing.
  • the present invention has for its object to avoid the disadvantages mentioned in a hand tool with protective hood and to simplify the assembly.
  • the object is achieved in that the Axialabstützung and the twist lock are components of an independently of the device housing and the protective cover preassembled mounting arrangement having a detachable connection with the device housing.
  • the elements required for the complete definition of the protective cover relative to the device housing form a pre-assembly group, which can be manufactured and pre-assembled separately from the actual hand-held power tool and the protective cover.
  • the pre-assembly can be attached as a closed unit on the device housing, whereby the assembly cost is significantly reduced.
  • the mounting arrangement comprises a support element on which the axial support and the rotation lock are completely, i. in all directions and thus captive, can be fixed.
  • a stable connection of the two elements to each other with the interposition of the support element can be achieved with inexpensive to be produced form of the axial support and the rotation lock.
  • all necessary for the determination of the guard elements form a pre-assembled unit that can be manufactured and transported separately from the other hand tool.
  • the carrier element has first clamping means which cooperate with corresponding first counter clamping means of the axial support. This allows a particularly simple pre-assembly of the axial support on the support element.
  • the fastening arrangement has an abutment element which can be fixed completely to the carrier element with the interposition of the rotational locking.
  • multi-part rotary locks for example, have one or more locking body and at least one acting as a locking means or a bias generating spring element can be easily and captive held on the support member.
  • the carrier element has second clamping means which cooperate with corresponding second counter clamping means of the counter bearing element.
  • the pre-assembly of the mounting arrangement is further simplified.
  • the second clamping means are advantageously formed by elastic screw domes of the support element and the second counter-clamping means by receiving openings of the counter-bearing element, wherein the receiving openings for producing a clamping action each have a smaller free cross section than a respective cross section of the screw domes.
  • the second clamping means can take on a further function as a receptacle for fastening screws, whereby a more cost-effective production of the carrier element is achieved.
  • the carrier element is completely formed of an elastic plastic, whereby this is simpler and less expensive to produce together with the clamping means formed on it.
  • the fastening arrangement is releasably secured via a plurality of screw connections on the device housing, which are arranged around the tool shaft.
  • a stable releasable connection of the mounting arrangement is made possible on the device housing, which can be easily replaced, for example, for repair purposes or for attachment of another protective cover.
  • Fig. 1 shows an exploded view of a hand tool 2 in the form of an angle grinder, with a device housing 4, in which a motor 6 is housed, which drives a tool shaft 8 about a drive axis A in a manner not shown, at a housing opening 10 from the Appliance housing 4 protrudes out.
  • a tool holder 12 is provided, which serves for fixing a disk-shaped tool, not shown, such as a grinding or cutting disc.
  • a fastening arrangement designated as a whole with 20 can be attached to this device neck 14, by means of which a protective cover 22 can be fixed to the device neck 14.
  • the screws 18 are screwed into corresponding holes 24 which are provided on the base plate 16.
  • the mounting assembly 20 has an annular support member 26 which is formed entirely of elastic plastic. From this extend to one side, two first clamping means 28 in the form of cylindrical clamping bodies. These act, as shown by the arrows K1, together with corresponding first counter-clamping means 30 in the form of bores of an axial support 32 acting as annular plate.
  • the first clamping means 28 and the first counter-clamping means 30 are matched to one another in shape and size such that they produce a press fit in the mounted state. In this way, the axial support 32 can be held captive on the carrier element 26.
  • the carrier element 26 For receiving the screws 18, the carrier element 26 has four receiving bores 34, two of which extend through a respective screw mandrel 36a, 36b.
  • the screw mandrel 36a serves as a pivot bearing for a two-armed locking member 38 of a rotary lock 40.
  • the locking member 38 has for this purpose a bearing bore 44 through which the screw mandrel 36a extends therethrough.
  • the twist lock 40 is in addition to the locking part 38 of a leaf spring 42nd
  • the screw domes 36a, 36b which, like the rest of the carrier element 26, are formed from the elastic plastic are used as second clamping means.
  • the screw domes 36a, 36b act, as shown by the arrows K2, together with two second counter-clamping means 46, which are formed in the form of holes on a counter-bearing element 48 acting sheet metal part.
  • the screw domes 36a, 36b have a cross section with an outer diameter a which is slightly larger than an inner diameter b of a free cross section of the second counter clamping means 46, as can be seen from FIG.
  • the rotary lock 40 can be held captive on the carrier element 26.
  • the entire mounting assembly 20 forms a pre-assembly, which can be completely pre-assembled and transported independently of the other hand tool 2, to be subsequently secured by the screws 18 on the device housing 4.
  • the protective hood 22 has a fastening collar 50, from which four cams 52 protrude in the radial direction.
  • the four cams 52 cooperate with four at a inner edge 54 of the Axialabstützung 32 correspondingly arranged and dimensioned radial recesses 56 together as coding. This causes the four cams 52 are only in a single rotational position over 360 ° with respect to the axial support 32 exactly aligned with the four radial recesses 56.
  • the mounting collar 50 can be pushed into the mounting assembly 20 only in this rotational position, to axially fix the guard 22 by subsequent rotation of the mounting assembly 20 in the manner of a bayonet closure.
  • the four cams 52 are no longer in alignment with the radial recesses 56 and thus at least partially engage behind the axial support 32, as indicated in FIG. 2.
  • the fastening arrangement 20 in FIG. 2 with removed abutment element 48 is shown.
  • a plurality of locking elements 60 formed by axially extending recesses 60 are formed on a free edge 58 of the fastening collar 50, which interact with the rotary lock 40.
  • two locking cams 62 inside which are arranged and dimensioned to each other so that they engage in a locking position shown in two of the locking elements 60.
  • the locking member 38 by the leaf spring 42 which is connected to a End is clamped in a corresponding spring retainer 64 of the support member 26, biased in the locking position.
  • the screws 18 may be released and the previous attachment assembly 20 may be replaced with another preassembled attachment assembly 20.

Abstract

The hand tool has a motor (6) housed in a housing (4). Tools (8) are propelled around an axis (A) by the motor with a work piece part (12) rising out for a disk-shaped tool. A protection hood (22) for the partial cover of the tool is defined being held opposite the housing and axially supported (32) toward the axis and being rotatable around the axis. At the housing a turning lock (40) is provided which has a bolting device position. The axial support and the turning lock are components of a pre-mountable attachment arrangement (20), which connect to the equipment housing.

Description

Die Erfindung betrifft ein Handwerkzeuggerät, insbesondere ein Winkelschleifgerät, mit einem einen Motor aufnehmenden Gerätegehäuse. Aus diesem ragt an einer Gehäuseöffnung eine vom Motor um eine Antriebsachse angetriebene Werkzeugwelle heraus, an der ein scheibenförmiges Werkzeug mittels einer Werkzeugaufnahme festlegbar ist. Ferner ist an dem Gerätegehäuse eine Schutzhaube zur teilweisen Abdeckung des Werkzeuges festlegbar. Die Schutzhaube ist durch eine gegenüber dem Gerätegehäuse drehfeste Axialabstützung in Richtung der Antriebsachse gehalten, wobei sie jedoch um die Antriebsachse herum verdrehbar ist. Dabei ist an dem Gerätegehäuse eine Drehverriegelung vorgesehen, die eine Verriegelungsstellung aufweist, in der sie bei angebrachter Schutzhaube mit Verriegelungselementen der Schutzhaube in Eingriff steht. Aus dieser Verriegelungsstellung heraus ist die Drehverriegelung gegen die Kraft einer Feder in eine Entriegelungsstellung bewegbar, um die Schutzhaube in verschiedenen Drehstellungen gegenüber dem Gerätegehäuse festlegen zu können.The invention relates to a hand tool, in particular an angle grinder, with a motor housing a device housing. For this protrudes at a housing opening out of the motor driven by a drive shaft tool shaft, on which a disk-shaped tool by means of a tool holder can be fixed. Furthermore, a protective cover for partially covering the tool can be fixed to the device housing. The protective hood is held by a relative to the device housing rotationally fixed axial support in the direction of the drive axis, but it is rotatable about the drive axis. In this case, a rotary lock is provided on the device housing, which has a locking position in which it is in the protective hood with locking elements of the protective hood engaged. From this locking position out the rotary lock against the force of a spring in an unlocked position is movable to set the guard in different rotational positions relative to the device housing can.

Derartige Handwerkzeuggeräte können für verschiedene Anwendungen, wie beispielsweise Schleif- oder Schneidearbeiten, verwendet werden. Die Befestigungsanordnung ermöglicht für jede Anwendung das Einstellen einer geeigneten Drehstellung der Schutzhaube gegenüber dem Gerätegehäuse. Dabei sorgt die Drehverriegelung für eine sichere Festlegung der Schutzhaube in der jeweils gewählten Drehstellung.Such hand tooling can be used for various applications, such as grinding or cutting work. The mounting arrangement allows for each application to set a suitable rotational position of the guard relative to the device housing. The twist lock ensures a secure fixing of the guard in the selected rotational position.

Aus der DE 103 43 060 A1 ist eine Handwerkzeugmaschine mit einer Schutzhaube bekannt, bei der eine Drehposition der Schutzhaube gegenüber einem Gerätegehäuse durch einen Rasthebel arretierbar ist. Dieser ist neben einem Gerätehals schwenkbar am Gerätegehäuse gehalten und greift in entsprechende Eingriffsöffnungen an der Schutzhaube. Um eine andere Drehposition der Schutzhaube einstellen zu können, wird der Rasthebel entgegen der Kraft einer Schraubenfeder verschwenkt, die sich zwischen dem Rasthebel und dem Gerätegehäuse abstützt. In axialer Richtung wird die Schutzhaube über Radialnocken gehalten, die einen Ringwulst am Gerätehals hintergreifen.From the DE 103 43 060 A1 is a hand tool with a protective hood known in which a rotational position of the guard against a device housing can be locked by a locking lever. This is pivotally held next to a device neck on the device housing and engages in corresponding engagement openings on the guard. In order to set a different rotational position of the guard, the locking lever is pivoted against the force of a coil spring which is supported between the locking lever and the device housing. In the axial direction, the guard is held by radial cams, which engage behind an annular bead on the neck of the device.

Nachteilig an dem bekannten Handwerkzeuggerät ist, daß durch die hohe Anzahl von Elementen, die für die axiale und radiale Festlegung der Schutzhaube an dem Gerätegehäuse benötigt wird, ein hoher Montageaufwand resultiert. Darüber hinaus ist es erforderlich das gesamte Handwerkzeuggerät an die vorgesehene Schutzhaube anzupassen, wodurch die Verwendung verschiedener Schutzhauben am gleichen Handwerkzeuggerät nicht oder nur mit erheblichen konstruktiven Veränderungen möglich ist.A disadvantage of the known hand tool that results in a high assembly cost due to the high number of elements that is required for the axial and radial fixing of the protective cover on the device housing. In addition, it is necessary to adapt the entire hand tool to the intended protective cover, whereby the use of different protective hoods on the same hand tool is not possible or only with considerable structural changes.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, bei einem Handwerkzeuggerät mit Schutzhaube die genannten Nachteile zu vermeiden und die Montage zu vereinfachen.The present invention has for its object to avoid the disadvantages mentioned in a hand tool with protective hood and to simplify the assembly.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, daß die Axialabstützung und die Drehverriegelung Bestandteile einer unabhängig vom Gerätegehäuse und der Schutzhaube vormontierbaren Befestigungsanordnung sind, die eine lösbare Verbindung mit dem Gerätegehäuse aufweist. Hierdurch bilden die für die vollständige Festlegung der Schutzhaube gegenüber dem Gerätegehäuse erforderlichen Elemente eine Vormontagegruppe, die separat zum eigentlichen Handwerkzeuggerät und zur Schutzhaube hergestellt und vormontiert werden kann. Anschließend kann die Vormontagegruppe als eine geschlossene Einheit am Gerätegehäuse befestigt werden, wodurch der Montageaufwand erheblich reduziert wird. Zudem ist es auf diese Weise möglich, durch bloßen Austausch der Vormontagegruppe verschiedene Schutzhauben am selben Handwerkzeuggerät zu verwenden.According to the invention the object is achieved in that the Axialabstützung and the twist lock are components of an independently of the device housing and the protective cover preassembled mounting arrangement having a detachable connection with the device housing. As a result, the elements required for the complete definition of the protective cover relative to the device housing form a pre-assembly group, which can be manufactured and pre-assembled separately from the actual hand-held power tool and the protective cover. Subsequently, the pre-assembly can be attached as a closed unit on the device housing, whereby the assembly cost is significantly reduced. In addition, it is possible in this way to use different protective hoods on the same hand tool by simply replacing the pre-assembly.

In einer besonders bevorzugten Ausführungsform weist die Befestigungsanordnung ein Trägerelement auf, an dem die Axialabstützung und die Drehverriegelung vollständig, d.h. in alle Richtungen und somit unverlierbar, festlegbar sind. Hierdurch kann bei kostengünstig herzustellender Form der Axialabstützung und der Drehverriegelung eine stabile Verbindung beider Elemente zueinander unter Zwischenlage des Trägerelementes erzielt werden. Auf diese Weise bilden alle für die Festlegung der Schutzhaube erforderlichen Elemente eine vormontierbare Einheit, die separat zum sonstigen Handwerkzeuggerät hergestellt und transportiert werden kann.In a particularly preferred embodiment, the mounting arrangement comprises a support element on which the axial support and the rotation lock are completely, i. in all directions and thus captive, can be fixed. In this way, a stable connection of the two elements to each other with the interposition of the support element can be achieved with inexpensive to be produced form of the axial support and the rotation lock. In this way, all necessary for the determination of the guard elements form a pre-assembled unit that can be manufactured and transported separately from the other hand tool.

Vorteilhafterweise weist das Trägerelement erste Klemmmittel auf, die mit entsprechenden ersten Gegenklemmmitteln der Axialabstützung zusammen wirken. Hierdurch wird eine besonders einfache Vormontage der Axialabstützung am Trägerelement ermöglicht.Advantageously, the carrier element has first clamping means which cooperate with corresponding first counter clamping means of the axial support. This allows a particularly simple pre-assembly of the axial support on the support element.

Bevorzugterweise weist die Befestigungsanordnung ein Gegenlagerelement auf, das unter Zwischenlage der Drehverriegelung vollständig an dem Trägerelement festlegbar ist. Auf diese Weise können auch mehrteilige Drehverriegelungen, die beispielsweise einen oder mehrere Verriegelungskörper und wenigstens ein als Rastmittel wirkendes oder ein Vorspannung erzeugendes Federelement aufweisen, einfach und unverlierbar an dem Trägerelement gehalten werden.Preferably, the fastening arrangement has an abutment element which can be fixed completely to the carrier element with the interposition of the rotational locking. On In this way, multi-part rotary locks, for example, have one or more locking body and at least one acting as a locking means or a bias generating spring element can be easily and captive held on the support member.

Vorteilhafterweise weist das Trägerelement zweite Klemmmittel auf, die mit entsprechenden zweiten Gegenklemmmitteln des Gegenlagerelementes zusammen wirken. Hierdurch wird die Vormontage der Befestigungsanordnung weiter vereinfacht.Advantageously, the carrier element has second clamping means which cooperate with corresponding second counter clamping means of the counter bearing element. As a result, the pre-assembly of the mounting arrangement is further simplified.

Ferner sind die zweiten Klemmmittel vorteilhafterweise durch elastische Schraubdome des Trägerelementes und die zweiten Gegenklemmmittel durch Aufnahmeöffnungen des Gegenlagerelementes gebildet, wobei die Aufnahmeöffnungen zur Herstellung einer Klemmwirkung jeweils einen kleineren freien Querschnitt aufweisen als ein betreffender Querschnitt der Schraubdome. Hierdurch wird eine stabile Festlegung des Gegenlagerelementes an dem Trägerelement möglich. Dabei können die zweiten Klemmmittel eine weitere Funktion als Aufnahme für Befestigungsschrauben übernehmen, wodurch eine kostengünstigere Herstellung des Trägerelementes erzielt wird.Furthermore, the second clamping means are advantageously formed by elastic screw domes of the support element and the second counter-clamping means by receiving openings of the counter-bearing element, wherein the receiving openings for producing a clamping action each have a smaller free cross section than a respective cross section of the screw domes. As a result, a stable fixing of the abutment element on the support element is possible. In this case, the second clamping means can take on a further function as a receptacle for fastening screws, whereby a more cost-effective production of the carrier element is achieved.

In einer besonders vorteilhaften Ausführungsform ist das Trägerelement vollständig aus einem elastischen Kunststoff gebildet, wodurch dieses zusammen mit den an ihm ausgebildeten Klemmmitteln einfacher und kostengünstiger herstellbar ist.In a particularly advantageous embodiment, the carrier element is completely formed of an elastic plastic, whereby this is simpler and less expensive to produce together with the clamping means formed on it.

Vorteilhafterweise ist die Befestigungsanordnung über mehrere Schraubverbindungen am Gerätegehäuse lösbar befestigt, die um die Werkzeugwelle herum angeordnet sind. Auf diese Weise wird eine stabile lösbare Verbindung der Befestigungsanordnung an dem Gerätegehäuse ermöglicht, die beispielsweise zu Reparaturszwecken oder zur Befestigung einer anderen Schutzhaube leicht ausgetauscht werden kann.Advantageously, the fastening arrangement is releasably secured via a plurality of screw connections on the device housing, which are arranged around the tool shaft. In this way, a stable releasable connection of the mounting arrangement is made possible on the device housing, which can be easily replaced, for example, for repair purposes or for attachment of another protective cover.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles näher erläutert. Es zeigen:

Fig. 1
eine perspektivische Explosionsdarstellung eines erfindungsgemässen Handwerkzeuggerätes mit Schutzhaube und
Fig. 2
eine Draufsicht auf eine vormontierte Befestigungsanordnung in Richtung II aus Fig. 1, bei abgenommenem Gegenlagerelement.
The invention will be explained in more detail below with reference to an embodiment. Show it:
Fig. 1
an exploded perspective view of an inventive hand tool with protective hood and
Fig. 2
a plan view of a preassembled mounting assembly in the direction II of FIG. 1, with removed abutment element.

Fig. 1 zeigt in explodierter Darstellung ein Handwerkzeuggerät 2 in Form eines Winkelschleifgerätes, mit einem Gerätegehäuse 4, in dem ein Motor 6 untergebracht ist, der in nicht näher dargestellter Weise eine Werkzeugwelle 8 um eine Antriebsachse A antreibt, die an einer Gehäuseöffnung 10 aus dem Gerätegehäuse 4 heraus ragt. An der Werkzeugwelle 8 ist eine Werkzeugaufnahme 12 vorgesehen, die zur Festlegung eines nicht dargestellten scheibenförmigen Werkzeuges, wie einer Schleif- oder Trennscheibe, dient.Fig. 1 shows an exploded view of a hand tool 2 in the form of an angle grinder, with a device housing 4, in which a motor 6 is housed, which drives a tool shaft 8 about a drive axis A in a manner not shown, at a housing opening 10 from the Appliance housing 4 protrudes out. On the tool shaft 8, a tool holder 12 is provided, which serves for fixing a disk-shaped tool, not shown, such as a grinding or cutting disc.

Um die Werkzeugwelle 8 herum ist ein Gerätehals 14 angeordnet, der sich von einer Grundplatte 16 in axialer Richtung bezogen auf die Antriebsachse A weg erstreckt, wobei die Grundplatte 16 fest mit dem Gerätegehäuse 4 verbunden ist.Around the tool shaft 8 around a device neck 14 is arranged, which extends away from a base plate 16 in the axial direction with respect to the drive axis A, wherein the base plate 16 is fixedly connected to the device housing 4.

An diesem Gerätehals 14 ist durch Befestigung von vier Schrauben 18 entlang einer Montagerichtung M eine insgesamt mit 20 bezeichnete Befestigungsanordnung anbringbar, mittels der eine Schutzhaube 22 an dem Gerätehals 14 festgelegt werden kann. Dabei werden die Schrauben 18 in entsprechende Bohrungen 24 eingedreht, die an der Grundplatte 16 vorgesehen sind.By attaching four screws 18 along a mounting direction M, a fastening arrangement designated as a whole with 20 can be attached to this device neck 14, by means of which a protective cover 22 can be fixed to the device neck 14. The screws 18 are screwed into corresponding holes 24 which are provided on the base plate 16.

Die Befestigungsanordnung 20 weist ein ringförmiges Trägerelement 26 auf, das vollständig aus elastischem Kunststoff gebildet ist. Von diesem erstrecken sich zu einer Seite hin zwei erste Klemmmittel 28 in Form von zylindrischen Klemmkörpern. Diese wirken, wie durch die Pfeile K1 dargestellt, zusammen mit entsprechenden ersten Gegenklemmmitteln 30 in Form von Bohrungen eines als Axialabstützung 32 fungierenden ringförmigen Bleches. Die ersten Klemmmittel 28 und die ersten Gegenklemmmittel 30 sind dabei in Form und Größe derart aufeinander abgestimmt, daß sie im montierten Zustand eine Presspassung erzeugen. Auf diese Weise kann die Axialabstützung 32 unverlierbar an dem Trägerelement 26 gehalten werden.The mounting assembly 20 has an annular support member 26 which is formed entirely of elastic plastic. From this extend to one side, two first clamping means 28 in the form of cylindrical clamping bodies. These act, as shown by the arrows K1, together with corresponding first counter-clamping means 30 in the form of bores of an axial support 32 acting as annular plate. The first clamping means 28 and the first counter-clamping means 30 are matched to one another in shape and size such that they produce a press fit in the mounted state. In this way, the axial support 32 can be held captive on the carrier element 26.

Zur Aufnahme der Schrauben 18 weist das Trägerelement 26 vier Aufnahmebohrungen 34 auf, von denen sich zwei durch jeweils einen Schraubendom 36a, 36b hindurch erstrecken. Der Schraubendom 36a dient dabei als Drehlager für ein zweiarmiges Verriegelungsteil 38 einer Drehverriegelung 40. Das Verriegelungsteil 38 weist hierzu eine Lagerbohrung 44 auf, durch die sich der Schraubendom 36a hindurch erstreckt. Die Drehverriegelung 40 besteht zusätzlich zum Verriegelungsteil 38 aus einer Blattfeder 42.For receiving the screws 18, the carrier element 26 has four receiving bores 34, two of which extend through a respective screw mandrel 36a, 36b. The screw mandrel 36a serves as a pivot bearing for a two-armed locking member 38 of a rotary lock 40. The locking member 38 has for this purpose a bearing bore 44 through which the screw mandrel 36a extends therethrough. The twist lock 40 is in addition to the locking part 38 of a leaf spring 42nd

Um die Drehverriegelung 40 am Trägerelement 26 halten zu können werden die Schraubdome 36a, 36b, die wie das restliche Trägerelement 26 aus dem elastischen Kunststoff geformt sind, als zweite Klemmmittel verwendet. Die Schraubdome 36a, 36b wirken dabei, wie durch die Pfeile K2 dargestellt, zusammen mit zwei zweiten Gegenklemmmitteln 46, die in Form von Bohrungen an einem als Gegenlagerelement 48 fungierenden Blechteil ausgebildet sind. Die Schraubdome 36a, 36b weisen zur Erzielung einer stabilen Presspassung einen Querschnitt mit einem Aussendurchmesser a auf, der geringfügig größer ist als ein Innendurchmesser b eines freien Querschnittes der zweiten Gegenklemmmittel 46, wie aus Fig. 2 zu entnehmen ist. Hierdurch kann die Drehverriegelung 40 unverlierbar am Trägerelement 26 gehalten werden.In order to hold the twist lock 40 on the carrier element 26, the screw domes 36a, 36b, which, like the rest of the carrier element 26, are formed from the elastic plastic are used as second clamping means. The screw domes 36a, 36b act, as shown by the arrows K2, together with two second counter-clamping means 46, which are formed in the form of holes on a counter-bearing element 48 acting sheet metal part. To achieve a stable press fit, the screw domes 36a, 36b have a cross section with an outer diameter a which is slightly larger than an inner diameter b of a free cross section of the second counter clamping means 46, as can be seen from FIG. As a result, the rotary lock 40 can be held captive on the carrier element 26.

Auf diese Weise ist es möglich, sowohl die Axialabstützung 32 als auch die Drehverriegelung 40 allein über Klemmverbindungen an dem Trägerelement 26 zu halten. Somit bildet die gesamte Befestigungsanordnung 20 eine Vormontagegruppe, die unabhängig vom übrigen Handwerkzeuggerät 2 komplett vormontiert und transportiert werden kann, um anschließend durch die Schrauben 18 am Gerätegehäuse 4 befestigt zu werden.In this way it is possible to hold both the axial support 32 and the rotation lock 40 alone via clamping connections on the carrier element 26. Thus, the entire mounting assembly 20 forms a pre-assembly, which can be completely pre-assembled and transported independently of the other hand tool 2, to be subsequently secured by the screws 18 on the device housing 4.

Um nun die Schutzhaube 22 über die Befestigungsanordnung 20 an dem Gerätegehäuse 4 befestigen zu können, weist die Schutzhaube 22 einen Befestigungskragen 50 auf, von dem vier Nocken 52 in radialer Richtung abstehen. Die vier Nocken 52 wirken mit vier an einem Innenrand 54 der Axialabstützung 32 entsprechend angeordneten und dimensionierten Radialausnehmungen 56 zusammen als Codierung. Diese bewirkt, daß die vier Nocken 52 lediglich in einer einzigen Drehstellung über 360° gegenüber der Axialabstützung 32 genau in Flucht zu den vier Radialausnehmungen 56 stehen. Somit kann der Befestigungskragen 50 nur in dieser Drehstellung in die Befestigungsanordnung 20 hinein geschoben werden, um die Schutzhaube 22 durch anschließendes Verdrehen an der Befestigungsanordnung 20 in der Art eines Bajonettverschlusses axial festzulegen. Hierbei stehen die vier Nocken 52 nun nicht mehr in einer Flucht mit den Radialausnehmungen 56 und hintergreifen somit zumindest teilweise die Axialabstützung 32, wie in Fig. 2 angedeutet. Zum besseren Verständnis ist hierbei die Befestigungsanordnung 20 in Fig. 2 mit abgenommenem Gegenlagerelement 48 dargestellt.In order to be able to fasten the protective hood 22 to the device housing 4 via the fastening arrangement 20, the protective hood 22 has a fastening collar 50, from which four cams 52 protrude in the radial direction. The four cams 52 cooperate with four at a inner edge 54 of the Axialabstützung 32 correspondingly arranged and dimensioned radial recesses 56 together as coding. This causes the four cams 52 are only in a single rotational position over 360 ° with respect to the axial support 32 exactly aligned with the four radial recesses 56. Thus, the mounting collar 50 can be pushed into the mounting assembly 20 only in this rotational position, to axially fix the guard 22 by subsequent rotation of the mounting assembly 20 in the manner of a bayonet closure. Here, the four cams 52 are no longer in alignment with the radial recesses 56 and thus at least partially engage behind the axial support 32, as indicated in FIG. 2. For better understanding, in this case the fastening arrangement 20 in FIG. 2 with removed abutment element 48 is shown.

Wie ferner aus Fig. 1 und 2 zu entnehmen ist, sind an einem freien Rand 58 des Befestigungskragens 50 mehrere durch sich axial erstreckende Ausnehmungen geformte Verriegelungselemente 60 ausgebildet, die mit der Drehverriegelung 40 zusammenwirken. Hierzu ragen, wie insbesondere aus Fig. 2 zu entnehmen ist, an einem ersten Arm des Verriegelungsteiles 38 zwei Rastnocken 62 nach Innen, die so zueinander angeordnet und dimensioniert sind, daß sie in einer dargestellten Verriegelungsstellung in zwei der Verriegelungselemente 60 eingreifen. Dabei ist das Verriegelungsteil 38 durch die Blattfeder 42, die an einem Ende in einer Entsprechenden Federaufnahme 64 des Trägerelementes 26 eingespannt ist, in die Verriegelungsstellung vorgespannt.As can also be seen from FIGS. 1 and 2, a plurality of locking elements 60 formed by axially extending recesses 60 are formed on a free edge 58 of the fastening collar 50, which interact with the rotary lock 40. To this end, as can be seen in particular from Fig. 2, on a first arm of the locking member 38, two locking cams 62 inside, which are arranged and dimensioned to each other so that they engage in a locking position shown in two of the locking elements 60. In this case, the locking member 38 by the leaf spring 42 which is connected to a End is clamped in a corresponding spring retainer 64 of the support member 26, biased in the locking position.

Durch Druck auf einen am zweiten Arme des Verriegelungsteils 38 ausgeformten Knopf 64 wird dieses um den Schraubendom 36a herum in eine strichpunktiert dargestellte Entriegelungsstellung verschwenkt, in der die Rastnocken 62 ausser Eingriff mit den Verriegelungselementen 60 stehen. In dieser Entriegelungsstellung kann die Schutzhaube 22 somit gegenüber der Befestigungsanordnung 20 und somit gegenüber dem Gerätegehäuse 4 entlang einer Drehrichtung D verdreht werden. Hierdurch kann beispielsweise eine für eine bestimmte Anwendung günstige Drehposition der Schutzhaube 20 eingestellt oder die Nocken 52 können in axiale Flucht mit den Radialausnehmungen 56 gebracht werden, um den Befestigungskragen 50 wieder aus der Befestigungsanordnung 20 bewegen zu können und dadurch die Schutzhaube 22 vom Handwerkzeuggerät 2 zu trennen.By pressing on a button 64 formed on the second arm of the locking part 38, it is pivoted about the screw boss 36a into an unlocking position shown in phantom in which the locking cams 62 are out of engagement with the locking elements 60. In this unlocking position, the protective cover 22 can thus be rotated relative to the fastening arrangement 20 and thus relative to the device housing 4 along a direction of rotation D. As a result, for example, a favorable for a particular application rotational position of the guard 20 set or the cam 52 can be brought into axial alignment with the Radialausnehmungen 56 to move the mounting collar 50 back out of the mounting assembly 20 and thereby the guard 22 from the power tool 2 separate.

Im Falle, daß an der Befestigungsanordnung 20 eine Beschädigung auftritt oder eine andere Ausführungsvariante der Befestigungsanordnung 20 zur Anbringung einer anderen Schutzhaube 22 verwendet werden soll, können die Schrauben 18 wieder gelöst und die bisherige Befestigungsanordnung 20 kann durch eine andere vormontierte Befestigungsanordnung 20 ausgetauscht werden.In the event that damage occurs to the attachment assembly 20 or another embodiment of the attachment assembly 20 is to be used to attach another guard 22, the screws 18 may be released and the previous attachment assembly 20 may be replaced with another preassembled attachment assembly 20.

Claims (8)

Handwerkzeuggerät (2), insbesondere Winkelschleifgerät, mit einem einen Motor (6) aufnehmenden Gerätegehäuse (4),
aus dem eine vom Motor (6) um eine Antriebsachse (A) angetriebene Werkzeugwelle (8) heraus ragt, an der eine Werkzeugaufnahme (12) zur Festlegung eines scheibenförmigen Werkzeuges vorgesehen ist,
und an dem eine Schutzhaube (22) zur teilweisen Abdeckung des Werkzeuges festlegbar ist, die an einer gegenüber dem Gerätegehäuse (4) drehfesten Axialabstützung (32) in Richtung der Antriebsachse (A) gehalten und um die Antriebsachse (A) herum verdrehbar ist,
wobei an dem Gerätegehäuse (4) eine Drehverriegelung (40) vorgesehen ist, die eine Verriegelungsstellung aufweist, in der sie mit Verriegelungselementen (60) der Schutzhaube (22) in Eingriff bringbar ist und aus der sie in eine Entriegelungsstellung bewegbar ist, um die Schutzhaube (22) in verschiedenen Drehstellungen gegenüber dem Gerätegehäuse (4) festlegen zu können,
dadurch gekennzeichnet, daß die Axialabstützung (32) und die Drehverriegelung (40) Bestandteile einer vormontierbaren Befestigungsanordnung (20) sind, die eine lösbare Verbindung mit dem Gerätegehäuse (4) aufweist.
Hand tool (2), in particular angle grinder, with a motor housing (6) receiving device housing (4),
from which a tool shaft (8) driven by the motor (6) about a drive axis (A) protrudes, on which a tool holder (12) for fixing a disk-shaped tool is provided,
and on which a protective hood (22) for partially covering the tool can be fixed, which is held on a relative to the device housing (4) non-rotatable axial support (32) in the direction of the drive axis (A) and around the drive axis (A) around,
wherein on the device housing (4) a rotary lock (40) is provided which has a locking position in which it is engageable with locking elements (60) of the protective cover (22) and from which it is movable to an unlocked position to the protective hood (22) to be set in different rotational positions relative to the device housing (4),
characterized in that the axial support (32) and the pivot lock (40) are components of a preassembled mounting arrangement (20) having a releasable connection to the device housing (4).
Handwerkzeuggerät nach Anspruch 1, dadurch gekennzeichnet, daß die Befestigungsanordnung (20) ein Trägerelement (26) aufweist, an dem die Axialabstützung (32) und die Drehverriegelung (40) vollständig festlegbar sind.Hand tool according to Claim 1, characterized in that the fastening arrangement (20) has a carrier element (26) on which the axial support (32) and the rotary lock (40) are completely fixable. Handwerkzeuggerät nach Anspruch 2, dadurch gekennzeichnet, daß das Trägerelement (32) erste Klemmmittel (28) aufweist, die mit entsprechenden ersten Gegenklemmmitteln (30) der Axialabstützung (32) zusammen wirken.Hand tool according to Claim 2, characterized in that the carrier element (32) has first clamping means (28) which cooperate with corresponding first counter-clamping means (30) of the axial support (32). Handwerkzeuggerät nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Befestigungsanordnung (20) ein Gegenlagerelement (48) aufweist, das unter Zwischenlage der Drehverriegelung (40) vollständig an dem Trägerelement (26) festlegbar ist.Hand tool according to Claim 2 or 3, characterized in that the fastening arrangement (20) has an abutment element (48) which can be fixed completely to the carrier element (26) with the interposition of the rotary lock (40). Handwerkzeuggerät nach Anspruch 4, dadurch gekennzeichnet, daß das Trägerelement (32) zweite Klemmmittel aufweist, die mit entsprechenden zweiten Gegenklemmmitteln (46) des Gegenlagerelementes (48) zusammen wirken.Hand tool according to Claim 4, characterized in that the carrier element (32) has second clamping means which cooperate with corresponding second counter clamping means (46) of the counter bearing element (48). Handwerkzeuggerät nach Anspruch 5, dadurch gekennzeichnet, daß die zweiten Klemmmittel durch elastische Schraubdome (36a, 36b) und die zweiten Gegenklemmmittel (46) durch Ausnehmungen des Gegenlagerelementes (48) gebildet sind, wobei die Gegenklemmmittel (46) zur Herstellung einer Klemmwirkung jeweils einen kleineren freien Querschnitt aufweisen als ein betreffender Querschnitt der Schraubdome (36a, 36b).Hand tool according to claim 5, characterized in that the second clamping means by elastic screw domes (36a, 36b) and the second counter clamping means (46) are formed by recesses of the counter bearing element (48), wherein the counter clamping means (46) for producing a clamping effect in each case a smaller have free cross-section than a respective cross-section of the screw domes (36a, 36b). Handwerkzeuggerät nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß das Trägerelement (26) vollständig aus einem elastischen Kunststoff gebildet ist.Hand tool according to one of claims 2 to 6, characterized in that the carrier element (26) is formed entirely from an elastic plastic. Handwerkzeuggerät nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Befestigungsanordnung (20) über mehrere Schraubverbindungen am Gerätegehäuse (4) lösbar befestigt ist, die um die Werkzeugwelle (8) herum angeordnet sind.Hand tool according to one of claims 1 to 7, characterized in that the fastening arrangement (20) via a plurality of screw on the device housing (4) is releasably attached, which are arranged around the tool shaft (8) around.
EP20060116064 2005-07-05 2006-06-26 Hand tool with protective hood Active EP1741521B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510000085 DE102005000085A1 (en) 2005-07-05 2005-07-05 Hand tool with protective hood

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EP1741521B1 EP1741521B1 (en) 2009-01-21

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US20140080391A1 (en) * 2012-09-18 2014-03-20 Ingersoll-Rand Company Grinding Tools With Guards
WO2017055125A1 (en) * 2015-09-29 2017-04-06 Robert Bosch Gmbh Hand-held power tool having at least one machine-side contact element
EP3112090A4 (en) * 2014-02-28 2017-09-27 Hitachi Koki Co., Ltd. Electric tool

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DE3913898A1 (en) * 1989-04-27 1990-10-31 Licentia Gmbh Adjustable guard for portable power tools - has indent mechanism for angular adjustment and finger pressure actuated fastening to spindle nose
DE19914855A1 (en) * 1999-04-01 2000-10-05 Metabowerke Kg Manual grinder has protective cover on machine housing, holder ring, collar, catches and catch-shaped, spring element
DE10115635C1 (en) * 2001-03-23 2002-10-24 Flex Elektrowerkzeuge Gmbh Protective hood for grinding wheel set at right-angles to axis of hand tool is shaped as semicircle and covers arc of circle under motor and has ratchet system to help hold it in place
US20050037702A1 (en) 2003-08-11 2005-02-17 Christian Koschel Hood mounting
DE10343060A1 (en) * 2003-09-16 2005-04-07 Robert Bosch Gmbh Protective cowl for hand power tool especially for angle grinder has an adjustable fitting with a finger pressure ratchet lever engaging ratchet holes in cowl mounting

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US5637035A (en) * 1995-06-28 1997-06-10 Milwaukee Electric Tool Corporation Adjustable guard arrangement for power tool

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DE3913898A1 (en) * 1989-04-27 1990-10-31 Licentia Gmbh Adjustable guard for portable power tools - has indent mechanism for angular adjustment and finger pressure actuated fastening to spindle nose
DE19914855A1 (en) * 1999-04-01 2000-10-05 Metabowerke Kg Manual grinder has protective cover on machine housing, holder ring, collar, catches and catch-shaped, spring element
DE10115635C1 (en) * 2001-03-23 2002-10-24 Flex Elektrowerkzeuge Gmbh Protective hood for grinding wheel set at right-angles to axis of hand tool is shaped as semicircle and covers arc of circle under motor and has ratchet system to help hold it in place
US20050037702A1 (en) 2003-08-11 2005-02-17 Christian Koschel Hood mounting
DE10343060A1 (en) * 2003-09-16 2005-04-07 Robert Bosch Gmbh Protective cowl for hand power tool especially for angle grinder has an adjustable fitting with a finger pressure ratchet lever engaging ratchet holes in cowl mounting

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140080391A1 (en) * 2012-09-18 2014-03-20 Ingersoll-Rand Company Grinding Tools With Guards
US9352445B2 (en) * 2012-09-18 2016-05-31 Ingersoll-Rand Company Grinding tools with guards
EP3112090A4 (en) * 2014-02-28 2017-09-27 Hitachi Koki Co., Ltd. Electric tool
WO2017055125A1 (en) * 2015-09-29 2017-04-06 Robert Bosch Gmbh Hand-held power tool having at least one machine-side contact element
US20180272494A1 (en) * 2015-09-29 2018-09-27 Robert Bosch Gmbh Hand-Held Power Tool Having at Least One Machine-Side Contact Element
US10857645B2 (en) 2015-09-29 2020-12-08 Robert Bosch Gmbh Hand-held power tool having at least one machine-side contact element

Also Published As

Publication number Publication date
EP1741521B1 (en) 2009-01-21
DE102005000085A1 (en) 2007-01-11
DE502006002688D1 (en) 2009-03-12

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