EP1618990B1 - Power tool, especially angle grinder - Google Patents

Power tool, especially angle grinder Download PDF

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Publication number
EP1618990B1
EP1618990B1 EP05012497A EP05012497A EP1618990B1 EP 1618990 B1 EP1618990 B1 EP 1618990B1 EP 05012497 A EP05012497 A EP 05012497A EP 05012497 A EP05012497 A EP 05012497A EP 1618990 B1 EP1618990 B1 EP 1618990B1
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EP
European Patent Office
Prior art keywords
locking
hand
machine tool
locking ring
tool according
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EP05012497A
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German (de)
French (fr)
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EP1618990A1 (en
Inventor
Jiri Blazek
Manfred Kirchner
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Narex Ceska Lipa AS
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Narex Ceska Lipa AS
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Publication of EP1618990A1 publication Critical patent/EP1618990A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • 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 hand tool, in particular angle grinder, with a drive shaft for driving a rotating tool during operation and a spindle shaft to the drive shaft, with a protective cover is removably connectable, which has a pluggable on the spindle neck guard collar and rotatable in the connected state and in successive Angle positions is arranged latching, wherein on the circumference of the spindle neck a circumferential, radially outwardly open and accessible by at least one axial naturalung in the axial direction and the guard hood at least one suitable by the respective passage recess and guided during rotation of the connected guard in the guide groove guide member is arranged ,
  • angle grinders have a protective cover, which covers the grinding wheel with the exception of the attacking on the respective workpiece area and thus protects the user from injury.
  • the protective hood can be brought into the favorable for the respective workpiece machining rotational position. This twisting can be done by hand, with the guard locked in the successive angular positions.
  • the guard has radially outwardly open tooth gaps, which is assigned a manually operable housing-fixed locking device with a latch and associated control button.
  • the latch engages in one of the tooth gaps.
  • the locking lug exits so that the protective cover can be rotated.
  • the present invention the object of providing a hand tool of the type mentioned above, in which the guard not only tool-free up and can be removed but also can be easily rotated in handling in different angular positions. Furthermore, the effort required for this should be relatively low.
  • the guard When attaching the guard to the power tool, the guard is placed with its guard collar in such a rotational position on the spindle neck that the guide member passes through the passage to the guide groove. If you twist the protective cover from this Monday-rotational position, the guide member and this is the guard in the axial direction secured to the spindle neck. Simultaneously with the attachment of the guard collar on the spindle neck, the driving member reaches the locking ring, so that the locking ring rotates when turning the guard and locked in each rotational position with the locking disc.
  • an electrically operated angle grinder 1 which is an elongated, at the same time serving as a handle housing part 2, in which a drive motor is housed, and then a machine head 3, in which a deflection gear is included, via which a perpendicular to the longitudinal direction of the housing part 2 extending drive shaft 4 is driven.
  • the drive shaft 4 protrudes through a fixedly arranged on the underside of the machine head 3 spindle neck 5 to the outside.
  • the drive shaft 4 can be connected to a grinding wheel or, in the case of another hand tool, to another tool rotating during operation.
  • the region of the drive shaft 4 protruding in front of the spindle neck 5 has a thread onto which the grinding wheel, not shown, can be screwed.
  • the angle grinder 1 is associated with a protective hood 6, which can be removably connected to the coaxial with the drive shaft 4 spindle neck 5.
  • the protective cover 6 covers the grinding wheel towards the user.
  • the protective cover 6 releases the grinding wheel side opposite the machine head.
  • the protective hood 6 extends only over a part of the circumference, so that a circumferential area of the grinding wheel remains uncovered, with which the respective workpiece is machined.
  • the protective cover 6 has a protective hood collar 7, which is of annular design and is inserted onto the spindle neck 5.
  • a substantially radially projecting cover wall 8 is attached, which extends over only a portion of the circumference, so that the required for workpiece machining peripheral area remains free.
  • the outer circumference of the cover wall 8 is attached to a circular arc extending axially directed peripheral wall 9, which is associated with the grinding wheel circumference.
  • the circumferential wall 9 does not extend over the entire circumference of the grinding wheel and also leaves free the grinding wheel area required for workpiece machining.
  • the protective hood collar 7 is arranged coaxially with the drive shaft 4 on the spindle neck 5.
  • the protective hood collar 7 and thus the protective cover 6 can be rotated about the spindle neck 5, so that the peripheral region of the protective hood left free for the workpiece machining can be turned into the angular position required for the respective workpiece machining.
  • the guard performs, so to speak, a ratcheting motion, i. it automatically locks in the successive angular positions at short intervals, in such a way that the latching is automatically canceled again upon further rotation. In this way, the guard 6 keeps by itself in the set rotational position.
  • a circumferential, radially outwardly open guide groove 10 is arranged on the outer circumference of the spindle neck, which is accessible in the axial direction by one or more circumferentially distributed, axially directed passage recesses 11.
  • axial direction is meant in the present description, the axial direction of the drive shaft 4.
  • At the guard collar 7 at least one guide member 12 is arranged, wherein the number of guide members 12 of the number of passage openings 11 on the guard collar. 7 equivalent. In the illustrated case three distributed over the circumference arranged guide members 12 and accordingly three passage recesses 11 are provided.
  • the protective cover 6 To attach the protective hood collar 7 on the spindle neck 7, the protective cover 6 must be held in a mounting rotational position, in which the guide members 12 are arranged in the axial direction in alignment with the passage openings 11.
  • the guide members 12 are dimensioned so that they pass through the passage recesses 11, so that they pass through the passage recesses 11 to the guide groove 10 when attaching the protective hood collar 7. If you then twisted the protective cover 6, the guide members 12 are secured in the axial direction and are guided in the circumferential direction.
  • the protective cover 6 is in the assembly rotational position.
  • the open guard area is then turned back towards the user. In this position usually no workpiece machining takes place.
  • the protective hood 6 is rotated through approximately 180 °.
  • At the guard collar 7 at least one driving member 15 is arranged, which passes when attaching the guard collar 7 on the spindle neck 5 in rotational engagement with the locking ring 14, so that it is taken during rotation in the direction of rotation.
  • Each entrainment member 15 - in the embodiment, only one such entrainment member 15 is present - is assigned to the outer circumference of the locking ring 14, a rotary driving recess 16, in which the respective driving member 15 engages.
  • the driving member 15 is formed so narrow in the axial direction that it engages only on the locking ring 14.
  • the locking disk 13 and the locking ring 14 are in the axial direction outwardly of the guide groove 10 upstream.
  • the locking disc 13 is expediently located on the side facing away from the machine head 3 of the locking ring 14 and is thus in the axial direction outwardly preceded the locking ring.
  • the outer diameter of the locking disc 13 and the locking ring 14 substantially corresponds to the inner diameter of the protective hood collar 7.
  • the at least one push-through recess 17 of the fixed locking disk 13 is arranged in alignment with the at least one passage recess 11 through which the guide groove 10 is accessible.
  • the at least one push-through recess 18 of the rotatable locking ring 14, however, is arranged only in the assembly rotational position (eg, FIG.
  • each guide member 12 there is the locking ring 14 in the assembly rotational position when plugging or removing the guard collar 7 from the spindle neck 5 on the locking disc 13 and the locking ring 14 move past.
  • the locking ring 14 is, as already mentioned, arranged in view from below expediently behind the locking disc 13. Therefore, on the outer circumference of the locking disc 13, a through-hole 19 for inserting the arranged on the protective hood collar 7 driving member 15 is arranged so that the driving member 15 during assembly and disassembly of the protective cover 6 can move past the locking disc 13. If the diameter of the locking disk 13 were correspondingly smaller than the diameter of the locking ring 14, the through-hole 19 of the locking disk could be omitted.
  • the rotary driving recess 16 of the locking ring 14 is arranged in the assembly rotational position ( Figure 3) of the protective cover 6 in alignment with the through-recess 19 of the locking disc 13.
  • the driving member 15 engages behind the locking disc 13, you can see from the push-through recesses 17, which, however, may be smaller than the driving element 15.
  • guard 6 encloses the guard collar 7, the locking disc 13 and the locking ring 14.
  • the guide groove 10 can be enclosed.
  • the at least one guide member 12 and the at least one driving member 15 are arranged on the inside of the protective hood collar 7. They are arranged offset in the axial direction of the distance between the guide groove 10 and the locking ring 14 corresponding to each other.
  • the locking ring 14 rotates when turning the protective cover 6, as already mentioned, so to speak ratcheting past the locking disc 13.
  • a sliding ring 20 is arranged, on which the locking ring 14 is slidably mounted.
  • the locking ring 14 and the locking disc 13 are sufficiently firmly held against each other in the axial direction, so that the locking ring 14 in the individual angular positions can be rotated latching.
  • expediently extending in the axial direction fastening screws 21 are provided which pass through the locking disc 13 and the locking ring 14 and then screwed to the locking disc and the locking ring in the spindle neck 5, so that the locking disc and the locking ring by means of the heads of the fastening screws 21 toward each other and held against the spindle neck.
  • three detent balls are arranged on the detent disk 13, distributed over the circumference and projecting in the axial direction towards the detent ring 14, which are assigned a ring of detent recesses 23 arranged sequentially in the circumferential direction on the detent ring 14 ,
  • the number of locking recesses 23 corresponds to the number of angular positions in which the protective cover 6 is locked.
  • the arrangement could also be reversed so that the locking balls on the locking ring and the locking recesses are arranged on the locking disc. Furthermore, it could also be in the place of the locking recesses 23 to latching recesses. Furthermore, the locking balls 22 could also be replaced by other locking projections. In addition, more or less than three locking balls 22 and locking projections could be present.
  • the locking balls 22 sit in each case in a spherical, to the locking ring 14 towards open indentation 24 of the locking disc 13 and are available from the respective indentation 24 to the locking ring 14 towards.
  • the latching recesses 23 are likewise expediently spherical indentations 25 on the latching ring 14.
  • each angular position of the protective hood 6 the locking balls 22 each engage in one of the locking recesses 23.
  • the detent balls 22 emerge from the detent recesses 23 and then latch into the respective next detent recesses 23.
  • the locking disc 13 is resilient at least in the region of the locking balls 22 in the axial direction.
  • the locking disc 13 expediently made of spring steel.
  • locking disk and the locking ring could be designed to be resilient in the axial direction.
  • the protective hood collar 7 is slotted and can be changed in diameter by means of a tensioning device 26 so that the protective hood collar 7, which is otherwise rotatable on the spindle neck 5, can be tightened on the spindle neck 5.
  • the protective hood collar 7 consists of strip-shaped material, whose end regions 27, 28 are angled radially outwards and lie opposite each other with the formation of a slot 29.
  • the distance between the two end regions 27, 28 can be changed by means of a clamping screw 30, which passes through the two end regions 27, 28.
  • the two end portions 27, 28 are arranged between the clamping screw head 31 and another end screwed onto the clamping screw 30 clamping nut 32, so that when screwing the clamping screw 30 relative to the clamping nut 32, the distance between the end portions 27, 28 changes.
  • a washer or the like may be arranged between the clamping screw head 31 and the facing end portion 27, .

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

Description

Die Erfindung betrifft eine Handwerkzeugmaschine, insbesondere Winkelschleifer, mit einer Antriebswelle zum Antreiben eines beim Betrieb rotierenden Werkzeugs und einem zur Antriebswelle koaxialen Spindelhals, mit dem eine Schutzhaube entfernbar verbindbar ist, die einen auf den Spindelhals steckbaren Schutzhaubenkragen aufweist und im verbundenen Zustand verdrehbar und in aufeinanderfolgenden Winkelstellungen verrastend angeordnet ist, wobei am Umfang des Spindelhalses eine umlaufende, radial außen offene und durch mindestens eine axiale Durchtrittsausnehmung in axialer Richtung zugängliche Führungsnut und am Schutzhaubenkragen mindestens ein durch die jeweilige Durchtrittsausnehmung passendes und beim Verdrehen der verbundenen Schutzhaube in der Führungsnut geführtes Führungsglied angeordnet ist.The invention relates to a hand tool, in particular angle grinder, with a drive shaft for driving a rotating tool during operation and a spindle shaft to the drive shaft, with a protective cover is removably connectable, which has a pluggable on the spindle neck guard collar and rotatable in the connected state and in successive Angle positions is arranged latching, wherein on the circumference of the spindle neck a circumferential, radially outwardly open and accessible by at least one axial Durchtrittsausnehmung in the axial direction and the guard hood at least one suitable by the respective passage recess and guided during rotation of the connected guard in the guide groove guide member is arranged ,

Insbesondere Winkelschleifer weisen eine Schutzhaube auf, die die Schleifscheibe mit Ausnahme im am jeweiligen Werkstück angreifenden Bereich abdeckt und somit den Benutzer vor Verletzungen schützt. Dabei kann die Schutzhaube in die für die jeweilige Werkstückbearbeitung günstige Drehlage gebracht werden. Dieses Verdrehen kann von Hand erfolgen, wobei die Schutzhaube in den aufeinanderfolgenden Winkelstellungen verrastet.In particular, angle grinders have a protective cover, which covers the grinding wheel with the exception of the attacking on the respective workpiece area and thus protects the user from injury. In this case, the protective hood can be brought into the favorable for the respective workpiece machining rotational position. This twisting can be done by hand, with the guard locked in the successive angular positions.

Bei einer aus der DE 295 13 331 U1 gemäß dem Oberbegriff des Anspruchs 1 bekannten Handwerkzeugmaschine der eingangs genannten Art weist die Schutzhaube nach radial außen hin offene Zahnlücken auf, denen eine manuell betätigbare gehäusefeste Verriegelungsvorrichtung mit einer Rastnase und zugehöriger Bedientaste zugeordnet ist. In der jeweiligen Drehstellung greift die Rastnase in eine der Zahnlücken ein. Durch Niederdrücken der Bedientaste tritt die Rastnase aus, sodass die Schutzhaube verdreht werden kann.In one known from DE 295 13 331 U1 according to the preamble of claim 1 hand tool of the type mentioned, the guard has radially outwardly open tooth gaps, which is assigned a manually operable housing-fixed locking device with a latch and associated control button. In the each rotational position, the latch engages in one of the tooth gaps. By depressing the control button, the locking lug exits so that the protective cover can be rotated.

Ausgehend hiervon liegt der vorliegenden Erfindung die Aufgabe zu Grunde, eine Handwerkzeugmaschine der oben genannten Art zu schaffen, bei der die Schutzhaube nicht nur werkzeuglos auf- und abmontiert werden kann sondern auch auf in der Handhabung einfache Weise in verschiedene Winkelstellungen verdreht werden kann. Ferner soll der dafür erforderliche Aufwand verhältnismäßig gering sein.Proceeding from this, the present invention, the object of providing a hand tool of the type mentioned above, in which the guard not only tool-free up and can be removed but also can be easily rotated in handling in different angular positions. Furthermore, the effort required for this should be relatively low.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass am Spindelhals in axialer Richtung hintereinander koaxial zur Antriebswelle und in axialer Richtung der Führungsnut nach außen hin vorgelagert eine feststehende Rastscheibe und ein verdrehbares, beim Verdrehen in aufeinanderfolgenden Winkelstellungen in axialer Richtung mit der Rastscheibe verrastender Rastring angeordnet sind und dass am Schutzhaubenkragen mindestens ein Mitnahmeglied angeordnet ist, das beim Aufstecken des Schutzhaubenkragens in Drehmitnahmeeingriff mit dem Rastring gelangt.This object is achieved in that the spindle neck in the axial direction one behind the other coaxial with the drive shaft and in the axial direction of the guide outwardly preceded by a fixed detent disc and a rotatable, when rotating in successive angular positions in the axial direction with the locking disc latching latching ring are arranged and in that at least one driving element is arranged on the protective hood collar, which engages with the locking ring when the protective hood collar is put into rotational driving engagement.

Beim Anbringen der Schutzhaube an der Handwerkzeugmaschine wird die Schutzhaube mit ihrem Schutzhaubenkragen in einer solchen Drehstellung auf den Spindelhals gesteckt, dass das Führungsglied durch die Durchtrittsausnehmung zur Führungsnut gelangt. Verdreht man die Schutzhaube aus dieser Montag-Drehstellung, ist das Führungsglied und über dieses die Schutzhaube in axialer Richtung am Spindelhals gesichert. Gleichzeitig mit dem Aufstecken des Schutzhaubenkragens auf den Spindelhals gelangt das Mitnahmeglied zum Rastring, sodass sich der Rastring beim Verdrehen der Schutzhaube mitdreht und dabei in jeder Drehstellung mit der Rastscheibe verrastet.When attaching the guard to the power tool, the guard is placed with its guard collar in such a rotational position on the spindle neck that the guide member passes through the passage to the guide groove. If you twist the protective cover from this Monday-rotational position, the guide member and this is the guard in the axial direction secured to the spindle neck. Simultaneously with the attachment of the guard collar on the spindle neck, the driving member reaches the locking ring, so that the locking ring rotates when turning the guard and locked in each rotational position with the locking disc.

Zum Wegnehmen der Schutzhaube muss diese nur in die genannte Montage-Drehstellung gedreht werden. Sie lässt sich dann ohne Weiteres vom Spindelhals abziehen.To remove the protective cover, it must only be turned into the aforementioned assembly rotary position. It can then be easily removed from the spindle neck.

Somit ergibt sich eine werkzeuglose Montage. Dabei ist die Handhabung denkbar einfach. Ferner sind die erforderlichen Maßnahmen ohne besonderen Aufwand zu verwirklichen.This results in a tool-free installation. The handling is very easy. Furthermore, the necessary measures can be implemented without any special effort.

Zweckmäßige Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous embodiments of the invention are specified in the subclaims.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung erläutert. Es zeigen:

Figur 1
einen erfindungsgemäßen Winkelschleifer zusammen mit einer Schutzhaube im nicht miteinander verbundenen Zustand in Schrägansicht,
Figur 2
den Winkelschleifer mit Schutzhaube gemäß Figur 1, ebenfalls in Schrägansicht, in explodierter Darstellungsweise, d.h. die Rastscheibe, der Rastring und der Gleitring sind im vom Spindelhals abgehobenen Zustand dargestellt,
Figur 3
die am Spindelhals montierte Schutzhaube in Ansicht von unten her gemäß Pfeil III in Figur 1,
Figur 4
die Anordnung nach Figur 3 in Schrägansicht und
Figur 5
die Anordnung gemäß den Figuren 3 und 4 im Schnitt gemäß der Schnittlinie A-A in Figur 3.
An embodiment of the invention will be explained with reference to the drawing. Show it:
FIG. 1
an angle grinder according to the invention together with a protective hood in the unconnected state in an oblique view,
FIG. 2
the angle grinder with protective cover according to FIG. 1, likewise in an oblique view, in an exploded manner of representation, ie the latching disc, the latching ring and the sliding ring are shown in the state raised from the spindle neck,
FIG. 3
the protective hood mounted on the spindle neck in a view from below according to arrow III in FIG. 1,
FIG. 4
the arrangement of Figure 3 in an oblique view and
FIG. 5
the arrangement according to Figures 3 and 4 in section along the section line AA in Figure 3.

Bei der aus der Zeichnung hervorgehenden Handwerkzeugmaschine handelt es sich um einen elektrisch betriebenen Winkelschleifer 1, der eine längliche, gleichzeitig als Handgriff dienende Gehäusepartie 2, in der ein Antriebsmotor untergebracht ist, und daran anschließend einen Maschinenkopf 3 aufweist, in dem ein Umlenkgetriebe enthalten ist, über das eine rechtwinkelig zur Längsrichtung der Gehäusepartie 2 verlaufende Antriebswelle 4 angetrieben wird. Die Antriebswelle 4 ragt durch einen feststehend an der Unterseite des Maschinenkopfes 3 angeordneten Spindelhals 5 nach außen. Die Antriebswelle 4 kann mit einer Schleifscheibe oder im Falle einer anderen Handwerkzeugmaschine mit einem anderen beim Betrieb rotierenden Werkzeug verbunden werden. Im dargestellten Falle weist der vor den Spindelhals 5 vorstehende Bereich der Antriebswelle 4 ein Gewinde auf, auf das die nicht dargestellte Schleifscheibe aufgeschraubt werden kann.In the resulting from the drawing hand tool is an electrically operated angle grinder 1, which is an elongated, at the same time serving as a handle housing part 2, in which a drive motor is housed, and then a machine head 3, in which a deflection gear is included, via which a perpendicular to the longitudinal direction of the housing part 2 extending drive shaft 4 is driven. The drive shaft 4 protrudes through a fixedly arranged on the underside of the machine head 3 spindle neck 5 to the outside. The drive shaft 4 can be connected to a grinding wheel or, in the case of another hand tool, to another tool rotating during operation. In the illustrated case, the region of the drive shaft 4 protruding in front of the spindle neck 5 has a thread onto which the grinding wheel, not shown, can be screwed.

Der Aufbau solcher Winkelschleifer ist allseits bekannt, so dass sich eine weitere allgemeine Beschreibung erübrigt.The construction of such angle grinder is well known, so that a further general description is unnecessary.

Dem Winkelschleifer 1 ist eine Schutzhaube 6 zugeordnet, die mit dem zur Antriebswelle 4 koaxialen Spindelhals 5 entfernbar verbunden werden kann. Im verbundenen Zustand deckt die Schutzhaube 6 die Schleifscheibe zum Benutzer hin ab. Dabei lässt die Schutzhaube 6 die dem Maschinenkopf entgegengesetzte Schleifscheibenseite frei. Ferner erstreckt sich die Schutzhaube 6 nur über einen Teil des Umfangs, so dass ein Umfangsbereich der Schleifscheibe unabgedeckt bleibt, mit dem das jeweilige Werkstück bearbeitet wird.The angle grinder 1 is associated with a protective hood 6, which can be removably connected to the coaxial with the drive shaft 4 spindle neck 5. In the connected state, the protective cover 6 covers the grinding wheel towards the user. In this case, the protective cover 6 releases the grinding wheel side opposite the machine head. Furthermore, the protective hood 6 extends only over a part of the circumference, so that a circumferential area of the grinding wheel remains uncovered, with which the respective workpiece is machined.

Die Schutzhaube 6 weist einen Schutzhaubenkragen 7 auf, der ringförmig umlaufend ausgebildet ist und auf den Spindelhals 5 gesteckt wird. An den Kragen 7 ist eine im Wesentlichen radial abstehende Abdeckwand 8 angesetzt, die sich nur über einen Teil des Umfangs erstreckt, so dass der für die Werkstückbearbeitung benötigte Umfangsbereich frei bleibt. An den Außenumfang der Abdeckwand 8 ist eine sich entlang einem Kreisbogen erstreckende, axial gerichtete Umfangswand 9 angesetzt, die dem Schleifscheibenumfang zugeordnet ist. Die Umfangswand 9 erstreckt sich wie die Abdeckwand 8 nicht über den ganzen Umfang der Schleifscheibe und lässt ebenfalls den für die Werkstückbearbeitung benötigten Schleifscheibenbereich frei.The protective cover 6 has a protective hood collar 7, which is of annular design and is inserted onto the spindle neck 5. At the collar 7 a substantially radially projecting cover wall 8 is attached, which extends over only a portion of the circumference, so that the required for workpiece machining peripheral area remains free. To the The outer circumference of the cover wall 8 is attached to a circular arc extending axially directed peripheral wall 9, which is associated with the grinding wheel circumference. Like the cover wall 8, the circumferential wall 9 does not extend over the entire circumference of the grinding wheel and also leaves free the grinding wheel area required for workpiece machining.

Im befestigten Zustand ist der Schutzhaubenkragen 7 koaxial zur Antriebswelle 4 auf dem Spindelhals 5 angeordnet. Dabei kann der Schutzhaubenkragen 7 und somit die Schutzhaube 6 um den Spindelhals 5 verdreht werden, so dass der für die Werkstückbearbeitung frei gelassene Umfangsbereich der Schutzhaube in die für die jeweilige Werkstückbearbeitung erforderliche Winkelstellung gedreht werden kann. Bei diesem Verdrehen führt die Schutzhaube sozusagen eine ratschende Bewegung aus, d.h. sie verrastet in den mit kurzen Abständen aufeinander folgenden Winkelstellungen jeweils selbsttätig, und zwar so, dass die Verrastung bei einem weiteren Verdrehen selbsttätig wieder aufgehoben wird. Auf diese Weise hält die Schutzhaube 6 von selbst in der eingestellten Drehstellung.In the attached state, the protective hood collar 7 is arranged coaxially with the drive shaft 4 on the spindle neck 5. In this case, the protective hood collar 7 and thus the protective cover 6 can be rotated about the spindle neck 5, so that the peripheral region of the protective hood left free for the workpiece machining can be turned into the angular position required for the respective workpiece machining. In this twisting, the guard performs, so to speak, a ratcheting motion, i. it automatically locks in the successive angular positions at short intervals, in such a way that the latching is automatically canceled again upon further rotation. In this way, the guard 6 keeps by itself in the set rotational position.

Zur Befestigung der Schutzhaube 6 am Spindelhals 5 ist am Au-ßenumfang des Spindelhalses eine umlaufende, radial außen offene Führungsnut 10 angeordnet, die durch eine oder mehrere in Umfangsrichtung verteilte, axial gerichtete Durchtrittsausnehmungen 11 in axialer Richtung zugänglich ist.For attachment of the protective cover 6 on the spindle neck 5, a circumferential, radially outwardly open guide groove 10 is arranged on the outer circumference of the spindle neck, which is accessible in the axial direction by one or more circumferentially distributed, axially directed passage recesses 11.

Mit "axialer Richtung" ist in vorliegender Beschreibung die Achsrichtung der Antriebswelle 4 gemeint.By "axial direction" is meant in the present description, the axial direction of the drive shaft 4.

Am Schutzhaubenkragen 7 ist mindestens ein Führungsglied 12 angeordnet, wobei die Anzahl der Führungsglieder 12 der Anzahl der Durchtrittsausnehmungen 11 am Schutzhaubenkragen 7 entspricht. Im dargestellten Falle sind drei über den Umfang verteilt angeordnete Führungsglieder 12 und dementsprechend drei Durchtrittsausnehmungen 11 vorgesehen. Zum Aufstecken des Schutzhaubenkragens 7 auf den Spindelhals 7 muss die Schutzhaube 6 in einer Montage-Drehstellung gehalten werden, in der die Führungsglieder 12 in axialer Richtung fluchtend zu den Durchtrittsausnehmungen 11 angeordnet sind. Die Führungsglieder 12 sind so bemaßt, dass sie durch die Durchtrittsausnehmungen 11 passen, so dass sie beim Aufstecken des Schutzhaubenkragens 7 durch die Durchtrittsausnehmungen 11 hindurch zur Führungsnut 10 gelangen. Verdreht man dann die Schutzhaube 6, sind die Führungsglieder 12 in axialer Richtung gesichert und werden in Umfangsrichtung geführt.At the guard collar 7 at least one guide member 12 is arranged, wherein the number of guide members 12 of the number of passage openings 11 on the guard collar. 7 equivalent. In the illustrated case three distributed over the circumference arranged guide members 12 and accordingly three passage recesses 11 are provided. To attach the protective hood collar 7 on the spindle neck 7, the protective cover 6 must be held in a mounting rotational position, in which the guide members 12 are arranged in the axial direction in alignment with the passage openings 11. The guide members 12 are dimensioned so that they pass through the passage recesses 11, so that they pass through the passage recesses 11 to the guide groove 10 when attaching the protective hood collar 7. If you then twisted the protective cover 6, the guide members 12 are secured in the axial direction and are guided in the circumferential direction.

In den Figuren 1 bis 3 befindet sich die Schutzhaube 6 in der Montage-Drehstellung. Der offene Schutzhaubenbereich ist dann nach hinten zum Benutzer hin gewandt. In dieser Stellung findet normalerweise keine Werkstückbearbeitung statt. In Figur 4 ist die Schutzhaube 6 dagegen um etwa 180° gedreht.In the figures 1 to 3, the protective cover 6 is in the assembly rotational position. The open guard area is then turned back towards the user. In this position usually no workpiece machining takes place. In contrast, in FIG. 4, the protective hood 6 is rotated through approximately 180 °.

Bezüglich der Figur 4 ist noch darauf hinzuweisen, dass der Schutzhaubenkragen 7 aufgeschnitten gezeichnet ist, so dass der dahinter liegende Spindelhals 5 sichtbar wird.With reference to FIG. 4, it should also be pointed out that the protective hood collar 7 is cut open so that the spindle neck 5 located behind it becomes visible.

Das beim Verdrehen der in der geschilderten Weise mit dem Spindelhals 5 verbundenen Schutzhaube 6 in den aufeinanderfolgenden Winkelstellungen auftretende lösbare Verrasten erfolgt mittels einer Rastscheibe 13 und eines Rastrings 14, die am Spindelhals 5 in axialer Richtung hintereinander koaxial zur Antriebswelle 4 angeordnet sind. Dabei ist die Rastscheibe 13 feststehend und der Rastring 14 verdrehbar angeordnet. Der Rastring 14 ist in Drehrichtung mit der Schutzhaube 6 gekoppelt, so dass er sich beim Verdrehen der Schutzhaube 7 mit dieser dreht. Bei seinem Verdrehen verrastet der Rastring 14 in den aufeinanderfolgenden Winkelstellungen in axialer Richtung mit der Rastscheibe 13.The connected in the manner described with the spindle neck 5 protective hood 6 occurring in the successive angular positions releasable locking takes place by means of a locking disc 13 and a locking ring 14 which are arranged on the spindle neck 5 in the axial direction one behind the other coaxial to the drive shaft 4. In this case, the locking disc 13 is fixed and the locking ring 14 rotatably arranged. The locking ring 14 is coupled in the direction of rotation with the protective cover 6, so that it rotates when turning the protective cover 7 with this. When twisting locked the Locking ring 14 in the successive angular positions in the axial direction with the locking disc thirteenth

Am Schutzhaubenkragen 7 ist mindestens ein Mitnahmeglied 15 angeordnet, das beim Aufstecken des Schutzhaubenkragens 7 auf den Spindelhals 5 in Drehmitnahmeeingriff mit dem Rastring 14 gelangt, so dass dieser beim Verdrehen in Drehrichtung mitgenommen wird.At the guard collar 7 at least one driving member 15 is arranged, which passes when attaching the guard collar 7 on the spindle neck 5 in rotational engagement with the locking ring 14, so that it is taken during rotation in the direction of rotation.

Jedem Mitnahmeglied 15 - beim Ausführungsbeispiel ist nur ein solches Mitnahmeglied 15 vorhanden - ist am Außenumfang des Rastrings 14 eine Drehmitnahme-Ausnehmung 16 zugeordnet, in die das betreffende Mitnahmeglied 15 eingreift. Das Mitnahmeglied 15 ist in axialer Richtung so schmal ausgebildet, dass es nur am Rastring 14 angreift.Each entrainment member 15 - in the embodiment, only one such entrainment member 15 is present - is assigned to the outer circumference of the locking ring 14, a rotary driving recess 16, in which the respective driving member 15 engages. The driving member 15 is formed so narrow in the axial direction that it engages only on the locking ring 14.

Die Rastscheibe 13 und der Rastring 14 sind in axialer Richtung nach außen hin der Führungsnut 10 vorgelagert. Dabei befindet sich die Rastscheibe 13 zweckmäßigerweise an der dem Maschinenkopf 3 abgewandten Seite des Rastrings 14 und ist somit in axialer Richtung nach außen hin dem Rastring vorgelagert.The locking disk 13 and the locking ring 14 are in the axial direction outwardly of the guide groove 10 upstream. In this case, the locking disc 13 is expediently located on the side facing away from the machine head 3 of the locking ring 14 and is thus in the axial direction outwardly preceded the locking ring.

Der Außendurchmesser der Rastscheibe 13 und des Rastrings 14 entspricht im Wesentlichen dem Innendurchmesser des Schutzhaubenkragens 7. In diesem Zusammenhang ist es zweckmäßig, dass am Außenumfang der Rastscheibe 13 und des Rastrings 14 eine in der Anzahl den Führungsgliedern 12 entsprechende Anzahl von Durchsteck-Aussparungen 17 bzw. 18 angeordnet ist, die zum Durchstecken des mindestens einen Führungsgliedes 12 beim Aufstecken oder Entfernen der Schutzhaube 6 dienen. Dabei ist die mindestens eine Durchsteck-Aussparung 17 der feststehenden Rastscheibe 13 fluchtend zur mindestens einen Durchtrittsausnehmung 11 angeordnet, durch die die Führungsnut 10 zugänglich ist. Die mindestens eine Durchsteck-Aussparung 18 des verdrehbaren Rastrings 14 ist dagegen nur in der Montage-Drehstellung (z.B. Figur 3) der Schutzhaube 6 fluchtend zur mindestens einen Durchtrittsausnehmung 11 angeordnet. Auf diese Weise kann sich jedes Führungsglied 12, befindet sich der Rastring 14 in der Montage-Drehstellung, beim Aufstecken oder Abziehen des Schutzhaubenkragens 7 vom Spindelhals 5 an der Rastscheibe 13 und dem Rastring 14 vorbei bewegen.The outer diameter of the locking disc 13 and the locking ring 14 substantially corresponds to the inner diameter of the protective hood collar 7. In this context, it is expedient that on the outer circumference of the locking disc 13 and the locking ring 14 in the number of guide members 12 corresponding number of push-through recesses 17 and 18 is arranged, which serve for the insertion of the at least one guide member 12 when attaching or removing the protective cover 6. In this case, the at least one push-through recess 17 of the fixed locking disk 13 is arranged in alignment with the at least one passage recess 11 through which the guide groove 10 is accessible. The at least one push-through recess 18 of the rotatable locking ring 14, however, is arranged only in the assembly rotational position (eg, FIG. 3) of the protective hood 6 in alignment with the at least one through-passage 11. In this way, each guide member 12, there is the locking ring 14 in the assembly rotational position when plugging or removing the guard collar 7 from the spindle neck 5 on the locking disc 13 and the locking ring 14 move past.

Wäre der Durchmesser der Rastscheibe 13 und/oder des Rastrings 14 kleiner; könnten die Durchsteck-Aussparungen 17 bzw. 18 weggelassen werden.If the diameter of the locking disk 13 and / or the locking ring 14 were smaller; could the through-cutouts 17 and 18 are omitted.

Der Rastring 14 ist, wie bereits erwähnt, in Ansicht von unten her zweckmäßigerweise hinter der Rastscheibe 13 angeordnet. Daher ist am Außenumfang der Rastscheibe 13 eine Durchsteck-Ausnehmung 19 zum Durchstecken des am Schutzhaubenkragen 7 angeordneten Mitnahmegliedes 15 angeordnet, so dass sich das Mitnahmeglied 15 bei der Montage und Demontage der Schutzhaube 6 an der Rastscheibe 13 vorbei bewegen kann. Wäre der Durchmesser der Rastscheibe 13 entsprechend kleiner als der Durchmesser des Rastrings 14, könnte die Durchsteck-Ausnehmung 19 der Rastscheibe weggelassen werden.The locking ring 14 is, as already mentioned, arranged in view from below expediently behind the locking disc 13. Therefore, on the outer circumference of the locking disc 13, a through-hole 19 for inserting the arranged on the protective hood collar 7 driving member 15 is arranged so that the driving member 15 during assembly and disassembly of the protective cover 6 can move past the locking disc 13. If the diameter of the locking disk 13 were correspondingly smaller than the diameter of the locking ring 14, the through-hole 19 of the locking disk could be omitted.

Die Drehmitnahme-Ausnehmung 16 des Rastrings 14 ist in der Montage-Drehstellung (Figur 3) der Schutzhaube 6 fluchtend zur Durchsteck-Ausnehmung 19 der Rastscheibe 13 angeordnet. In allen anderen Winkelstellungen der Schutzhaube hintergreift das Mitnahmeglied 15 die Rastscheibe 13, sieht man von den Durchsteck-Aussparungen 17 ab, die jedoch kleinflächiger als das Mitnahmeglied 15 sein können. Bei mit dem Spindelhals 5 verbundener Schutzhaube 6 umschließt der Schutzhaubenkragen 7 die Rastscheibe 13 und den Rastring 14. Außerdem kann die Führungsnut 10 umschlossen werden.The rotary driving recess 16 of the locking ring 14 is arranged in the assembly rotational position (Figure 3) of the protective cover 6 in alignment with the through-recess 19 of the locking disc 13. In all other angular positions of the guard, the driving member 15 engages behind the locking disc 13, you can see from the push-through recesses 17, which, however, may be smaller than the driving element 15. When connected to the spindle neck 5 guard 6 encloses the guard collar 7, the locking disc 13 and the locking ring 14. In addition, the guide groove 10 can be enclosed.

Das mindestens eine Führungsglied 12 und das mindestens eine Mitnahmeglied 15 sind an der Innenseite des Schutzhaubenkragens 7 angeordnet. Dabei sind sie in axialer Richtung dem Abstand zwischen der Führungsnut 10 und dem Rastring 14 entsprechend versetzt zueinander angeordnet.The at least one guide member 12 and the at least one driving member 15 are arranged on the inside of the protective hood collar 7. They are arranged offset in the axial direction of the distance between the guide groove 10 and the locking ring 14 corresponding to each other.

Der Rastring 14 dreht sich beim Verdrehen der Schutzhaube 6, wie bereits erwähnt, sozusagen ratschend an der Rastscheibe 13 vorbei. An der der Rastscheibe 13 entgegengesetzten Seite des Rastrings 14 ist ein Gleitring 20 angeordnet, an dem der Rastring 14 gleitend gelagert ist.The locking ring 14 rotates when turning the protective cover 6, as already mentioned, so to speak ratcheting past the locking disc 13. At the latching disc 13 opposite side of the locking ring 14, a sliding ring 20 is arranged, on which the locking ring 14 is slidably mounted.

Der Rastring 14 und die Rastscheibe 13 werden in axialer Richtung ausreichend fest gegeneinander gehalten, so dass der Rastring 14 in den einzelnen Winkelstellungen verrastend verdrehbar ist. Hierzu sind zweckmäßigerweise in axialer Richtung verlaufende Befestigungsschrauben 21 vorgesehen, die die Rastscheibe 13 und den Rastring 14 durchgreifen und anschließend an die Rastscheibe und den Rastring in den Spindelhals 5 eingeschraubt sind, so dass die Rastscheibe und der Rastring mittels der Köpfe der Befestigungsschrauben 21 aufeinander zu und gegen den Spindelhals gehalten werden.The locking ring 14 and the locking disc 13 are sufficiently firmly held against each other in the axial direction, so that the locking ring 14 in the individual angular positions can be rotated latching. For this purpose, expediently extending in the axial direction fastening screws 21 are provided which pass through the locking disc 13 and the locking ring 14 and then screwed to the locking disc and the locking ring in the spindle neck 5, so that the locking disc and the locking ring by means of the heads of the fastening screws 21 toward each other and held against the spindle neck.

Um das Verrasten in den aufeinanderfolgenden Winkelstellungen zu erreichen, sind an der Rastscheibe 13 drei über den Umfang verteilt angeordnete, in axialer Richtung zum Rastring 14 hin vorstehende Rastkugeln gelagert, denen an dem Rastring 14 ein Kranz von in Umfangsrichtung aufeinander folgend angeordneten Rastvertiefungen 23 zugeordnet ist. Die Anzahl der Rastvertiefungen 23 entspricht der Anzahl der Winkelstellungen, in denen die Schutzhaube 6 verrastet.In order to achieve locking in the successive angular positions, three detent balls are arranged on the detent disk 13, distributed over the circumference and projecting in the axial direction towards the detent ring 14, which are assigned a ring of detent recesses 23 arranged sequentially in the circumferential direction on the detent ring 14 , The number of locking recesses 23 corresponds to the number of angular positions in which the protective cover 6 is locked.

Die Anordnung könnte auch umgekehrt so getroffen sein, dass die Rastkugeln am Rastring und die Rastvertiefungen an der Rastscheibe angeordnet sind. Ferner könnte es sich an Stelle der Rastvertiefungen 23 auch um Rastausnehmungen handeln. Des Weiteren könnten die Rastkugeln 22 auch durch andere Rastvorsprünge ersetzt sein. Außerdem könnten auch mehr oder weniger als drei Rastkugeln 22 bzw. Rastvorsprünge vorhanden sein.The arrangement could also be reversed so that the locking balls on the locking ring and the locking recesses are arranged on the locking disc. Furthermore, it could also be in the place of the locking recesses 23 to latching recesses. Furthermore, the locking balls 22 could also be replaced by other locking projections. In addition, more or less than three locking balls 22 and locking projections could be present.

Die Rastkugeln 22 sitzen jeweils in einer kugeligen, zum Rastring 14 hin offenen Einbauchung 24 der Rastscheibe 13 und stehen aus der jeweiligen Einbauchung 24 zum Rastring 14 hin vor.The locking balls 22 sit in each case in a spherical, to the locking ring 14 towards open indentation 24 of the locking disc 13 and are available from the respective indentation 24 to the locking ring 14 towards.

Bei den Rastvertiefungen 23 handelt es sich ebenfalls zweckmäßigerweise um kugelige Eindrückungen 25 am Rastring 14.The latching recesses 23 are likewise expediently spherical indentations 25 on the latching ring 14.

In jeder Winkelstellung der Schutzhaube 6 greifen die Rastkugeln 22 jeweils in eine der Rastvertiefungen 23 ein. Beim weiteren Verdrehen der Schutzhaube 6 treten die Rastkugeln 22 aus den Rastvertiefungen 23 aus und rasten dann in die jeweils nächsten Rastvertiefungen 23 ein.In each angular position of the protective hood 6, the locking balls 22 each engage in one of the locking recesses 23. Upon further rotation of the protective cover 6, the detent balls 22 emerge from the detent recesses 23 and then latch into the respective next detent recesses 23.

Um dieses ratschende Vorbeigleiten des Rastrings 14 an der Rastscheibe 13 zu ermöglichen, ist die Rastscheibe 13 zumindest im Bereich der Rastkugeln 22 in axialer Richtung federnd ausgebildet. Hierzu besteht die Rastscheibe 13 zweckmäßigerweise aus Federstahl.In order to enable this ratcheting sliding past the locking ring 14 on the locking disc 13, the locking disc 13 is resilient at least in the region of the locking balls 22 in the axial direction. For this purpose, the locking disc 13 expediently made of spring steel.

Anstelle der Rastscheibe könnte auch der Rastring oder könnten sowohl die Rastscheibe als auch der Rastring in axialer Richtung federnd ausgebildet sein.Instead of the locking disk and the locking ring or both the locking disc and the locking ring could be designed to be resilient in the axial direction.

Es gibt Anwendungsfälle, bei denen ein Feststellen der Schutzhaube 6 in der jeweiligen Winkelstellung erwünscht ist. Zu diesem Zwecke ist zweckmäßigerweise vorgesehen, dass der Schutzhaubenkragen 7 geschlitzt und mittels einer Spanneinrichtung 26 im Durchmesser veränderbar ist, so dass der ansonsten verdrehbar auf dem Spindelhals 5 sitzende Schutzhaubenkragen 7 auf dem Spindelhals 5 festgespannt werden kann.There are applications in which a determination of the protective cover 6 in the respective angular position is desired. For this purpose, it is expediently provided that the protective hood collar 7 is slotted and can be changed in diameter by means of a tensioning device 26 so that the protective hood collar 7, which is otherwise rotatable on the spindle neck 5, can be tightened on the spindle neck 5.

Der Schutzhaubenkragen 7 besteht aus bandförmigem Material, dessen Endbereiche 27, 28 nach radial außen hin abgewinkelt sind und sich unter Bildung eines Schlitzes 29 mit Abstand gegenüberliegen. Der Abstand zwischen den beiden Endbereichen 27, 28 kann mittels einer Spannschraube 30 verändert werden, die die beiden Endbereiche 27, 28 durchgreift. Die beiden Endbereiche 27, 28 sind zwischen dem Spannschraubenkopf 31 und einer andernends auf die Spannschraube 30 geschraubten Spannmutter 32 angeordnet, so dass sich beim Verschrauben der Spannschraube 30 relativ zur Spannmutter 32 der Abstand zwischen den Endbereichen 27, 28 verändert. Zwischen dem Spannschraubenkopf 31 und dem zugewandten Endbereich 27 kann eine Unterlegscheibe oder dergleichen angeordnet sein.The protective hood collar 7 consists of strip-shaped material, whose end regions 27, 28 are angled radially outwards and lie opposite each other with the formation of a slot 29. The distance between the two end regions 27, 28 can be changed by means of a clamping screw 30, which passes through the two end regions 27, 28. The two end portions 27, 28 are arranged between the clamping screw head 31 and another end screwed onto the clamping screw 30 clamping nut 32, so that when screwing the clamping screw 30 relative to the clamping nut 32, the distance between the end portions 27, 28 changes. Between the clamping screw head 31 and the facing end portion 27, a washer or the like may be arranged.

Claims (16)

  1. Hand-operated machine tool, in particular angle grinder, with a drive shaft (4) for driving a tool rotating in operation and with a spindle neck (5) coaxial with the drive shaft (4), to which a wheel guard (6), which has a wheel guard collar (7) capable of being fitted to the spindle neck (5) and is, in the connected state, rotatable and lockable in successive angular positions, can be removably connected, wherein a continuous guide groove (10) open in the radially outward direction and accessible in the axial direction through at least one axial through-opening (11) is provided on the circumference of the spindle neck (5) and at least one guide element (12) fitting through the relevant through-opening (11) and guided in the guide groove (10) while the wheel guard (6) is turned is located on the wheel guard collar (7), characterised in that a fixed locking disk (13) and a rotatable locking ring (14) locked to the locking disk (13) in the axial direction in successive angular positions while being rotated are located on the spindle neck (5) one behind the other in the axial direction and coaxial with the drive shaft (4) in front of the guide groove (10) towards the outside in the axial direction, and in that at least one driving element (15) coming into rotary driving engagement with the locking ring (14) is located on the wheel guard collar (7).
  2. Hand-operated machine tool according to claim 1, characterised in that the locking disk (13) and the locking ring (14) are located in front of the guide groove (10) towards the outside in the axial direction.
  3. Hand-operated machine tool according to claim 2, characterised in that at least one circumferentially open through-recess (17 or 18) is provided on the outer circumference of the locking disk (13) or the locking ring (14) for passing through the at least one guide element (12) when installing or removing the wheel guard (6), wherein the at least one through-recess (17) of the fixed locking disk (13) is in alignment with the at least one through-hole (11) and wherein the at least one through-recess (18) of the locking ring (14) is in alignment with the at least one through-hole (11) in an installed rotary position of the wheel guard (6).
  4. Hand-operated machine tool according to any of claims 1 to 3, characterised in that the locking disk (13) is located in front of the locking ring (14) in the axial direction.
  5. Hand-operated machine tool according to any of claims 1 to 4, characterised in that the locking disk (13) and/or the locking ring (14) are/is designed to be resilient in the axial direction.
  6. Hand-operated machine tool according to claim 5, characterised in that the locking disk (13) and/or the locking ring (14) are/is made of spring steel.
  7. Hand-operated machine tool according to any of claims 1 to 6, characterised in that the locking disk (13) and the locking ring (14) are secured to the spindle neck (5) and held to one another by mounting screws (21) passing through the locking disk and the locking ring.
  8. Hand-operated machine tool according to any of claims 1 to 7, characterised in that at least one rotary driving recess (16) for engagement with the at least one driving element (15) is located on the outer circumference of the locking ring (14).
  9. Hand-operated machine tool according to any of claims 4 to 8, characterised in that at least one through-hole (19) for passing through the at least one driving element (15) is located on the outer circumference of the locking disk (13).
  10. Hand-operated machine tool according to claim 9, characterised in that the at least one rotary driving recess (16) of the locking ring (14) is in alignment with the at least one through-hole 19 of the locking disk (13) in an installed rotary position of the wheel guard (6).
  11. Hand-operated machine tool according to any of claims 1 to 10, characterised in that the wheel guard collar (7) surrounds the locking disk (13) and the locking ring (14) in the connected position of the wheel guard (6).
  12. Hand-operated machine tool according to claim 11, characterised in that the at least one guide element (12) and the at least one driving element (15) are located on the inside of the wheel guard collar.
  13. Hand-operated machine tool according to any of claims 1 to 12, characterised in that the side of the locking ring (14) which is remote from the locking disk (13) bears on a face seal ring (20).
  14. Hand-operated machine tool according to any of claims 1 to 13, characterised in that at least one axially protruding locking projection (locking ball 22) is located on the locking disk (13) or the locking ring and in that a rim of circumferentially successive locking recesses or locking pockets (23) acting together with the at least one locking projection is located on the locking ring (14) or the locking disk.
  15. Hand-operated machine tool according to claim 14, characterised in that the at least one locking projection is represented by a locking ball (22) mounted on the locking disk (13) or the locking ring.
  16. Hand-operated machine tool according to any of claims 1 to 15, characterised in that the wheel guard collar (7) is slotted and its diameter can be changed by means of a clamping mechanism (26), enabling the wheel guard (6) to be clamped to the spindle neck (5) in the current angular position.
EP05012497A 2004-07-16 2005-06-10 Power tool, especially angle grinder Active EP1618990B1 (en)

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DE102004034441A DE102004034441A1 (en) 2004-07-16 2004-07-16 Hand tool, in particular angle grinder

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EP1864754A1 (en) * 2006-06-06 2007-12-12 Nederlandse Organisatie voor Toegepast-Natuuurwetenschappelijk Onderzoek TNO Protective cover for an electric grinding machine
DE102006027576A1 (en) 2006-06-14 2007-12-20 Robert Bosch Gmbh Guard attachment device
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DE102008000888A1 (en) 2008-03-31 2009-10-01 Robert Bosch Gmbh Hand tool, in particular hand-held angle grinder
DE102008002548B4 (en) * 2008-06-20 2021-11-11 Robert Bosch Gmbh Machine tool, in particular hand machine tool
DE102008044403A1 (en) * 2008-12-05 2010-06-10 Robert Bosch Gmbh Protection hood device, particular angular grinder protection hood device for hand tool machine, has fixing unit which is provided for fixing protection hood in different turning positions
EP2603354A1 (en) * 2010-08-11 2013-06-19 Bosch Power Tools (China) Co., Ltd. Portable angle grinder with improved protective guard
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CN103158071B (en) * 2011-12-14 2016-03-09 株式会社牧田 Grinder
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DE102014222987A1 (en) * 2014-11-11 2016-05-12 Robert Bosch Gmbh Angle grinder with an extension section
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CN106764380A (en) * 2016-12-29 2017-05-31 江苏省无锡探矿机械总厂有限公司 Fast Installation protective cover

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RU2463151C2 (en) * 2006-11-13 2012-10-10 Роберт Бош Гмбх Machining system built around hand-held machine
RU2465117C2 (en) * 2006-11-13 2012-10-27 Роберт Бош Гмбх Device for locking protective case assembly
RU2465118C2 (en) * 2006-11-13 2012-10-27 Роберт Бош Гмбх Device for locking protective case assembly
CN101534998B (en) * 2006-11-13 2013-12-18 罗伯特·博世有限公司 Portable power tool system

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DE502005000442D1 (en) 2007-04-19
DE102004034441A1 (en) 2006-02-16

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