EP1663575A1 - Portable power tool with protective cover - Google Patents

Portable power tool with protective cover

Info

Publication number
EP1663575A1
EP1663575A1 EP04762465A EP04762465A EP1663575A1 EP 1663575 A1 EP1663575 A1 EP 1663575A1 EP 04762465 A EP04762465 A EP 04762465A EP 04762465 A EP04762465 A EP 04762465A EP 1663575 A1 EP1663575 A1 EP 1663575A1
Authority
EP
European Patent Office
Prior art keywords
housing
protective hood
hand tool
tool according
lever
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
EP04762465A
Other languages
German (de)
French (fr)
Other versions
EP1663575B1 (en
Inventor
Peter Stierle
Juergen Wiker
Maria-Margareta Sulea
Stefan Heess
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1663575A1 publication Critical patent/EP1663575A1/en
Application granted granted Critical
Publication of EP1663575B1 publication Critical patent/EP1663575B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor

Definitions

  • the present invention is based on a hand tool according to the preamble of claim 1.
  • a hand tool which is designed as an angle grinder and is provided with a protective hood, the rotational position of which can be fixed in the circumferential direction with a simple, releasable locking mechanism.
  • Whose locking member consists essentially of a leaf spring, the projections for adjusting the protective hood can be brought out of engagement with recesses of the protective hood by hand and whose locking forces are impaired by deformation of the locking member under hard construction site operation.
  • the invention with the features of claim 1 has the advantage that a protective hood with associated robust, simple protective hood locking device can be installed on conventional hand-held power tools, in particular angle grinders, with which the protective hood can be reliably fixed in any rotational position.
  • the locking lever is arranged transversely to the longitudinal axis of the angle grinder and can be pivoted about an axis arranged essentially parallel to the housing, the movement paths of the locking lever are fixed and changes in the locking characteristics of the protective hood are thus excluded.
  • the protective hood can be secured in a non-positive or positive manner in this position.
  • the locking lever carries a push button at the free end and at the other end and / or in the middle at least one locking cam which engages in the protective hood and holds this form-fitting, an easy-to-use, robust and accurate locking means is created.
  • the locking lever is pivotally mounted on the housing, in particular on the gear housing, the function and assembly of the locking lever can only be achieved by loosening and re-screwing a flange screw.
  • the push button of the locking lever extends transversely to the transmission housing and beyond its circumference makes it easily accessible for at least one finger, in particular the index finger of the operating hand that grips the housing in the working position, the protective hood can be adjusted quickly and easily and incorrect operation is prevented.
  • the protective hood can be positively engaged with the rigid locking cams, it is possible to position the protective hood in any rotational position in a largely play-free manner and secure against unintentional loosening.
  • the gear housing has a flange that can be screwed onto the housing, with one of the flange screws also serving as the axis of rotation of the locking lever, the locking means of the angle grinder protection hood can be easily attached to conventional angle grinders.
  • the protective hood has latching openings on a pitch circle for engaging latching cams of the latching lever, a secure, positive locking of the protective hood in predetermined rotational positions with respect to the hand-held power tool is possible.
  • the protective hood is made of several parts, the first part being a ring-like collar, in particular with an angled edge area, made of strong material, and the second part being a disk-like base body, the protective hood can be produced from different materials in a particularly cost-effective manner because the parts are independent are easier to edit from each other and the protective hood can be manufactured as a lightweight component.
  • the second part namely the protective hood basic body, be made of particularly thin material, because only the collar part absorbs the locking forces between the locking openings and the locking cams of the locking lever.
  • the attachment area of the gearbox housing that carries the protective cover can be made of relatively roughly tolerated plastic, because the ring leaf spring Compensates for dimensional deviations or wear in the fastening area.
  • the gear housing has a fastening area for the protective hood designed as a cylindrical plastic neck, which belongs to a bearing flange concentrically encompassing the output shaft, can save weight on the gear housing and thus on the entire hand tool, so that the hand tool is more manageable and can be handled without fatigue ,
  • FIG. 1 shows the handheld power tool with protective hood in an exploded view
  • FIG. 2 shows the hand-held power tool according to FIG. 1 with the protective hood assembled before assembly
  • FIG. 3 shows the individual parts of a two-part exemplary embodiment of the protective hood
  • FIG. 4 assembles the protective hood according to FIG. 3,
  • FIG. 5 shows a second exemplary embodiment of a two-part protective hood — in an exploded view
  • FIG. 6 shows the exemplary embodiment according to FIG. 5, assembled
  • Figure 7 is a two-part protective hood with plastic collar and metal body and Figure 8 is a one-piece protective hood made of metal.
  • FIG. 1 shows the front area of a hand tool 10 designed as an angle grinder, the elongated housing 12 of which defines a longitudinal axis 13 of the hand tool 10.
  • a gear housing 14 is flanged to the housing 12, from which an output shaft 16 emerges at right angles to the longitudinal axis 13.
  • a grinding wheel At its free end a grinding wheel, not shown, can be fastened, which is encased by a protective hood 43 to protect the operator of the handheld power tool 10 from flying chips or parts of the grinding wheel.
  • the gear housing 14 is fastened to the housing 12 with flange screws 18 which engage in flange bores 20 running parallel to the longitudinal axis 13 and it carries a bearing flange 22 which surrounds the output shaft 16 in a ring-like manner.
  • the bearing flange 22 is designed in a plate-like manner in the area facing the gear housing 14 and can be connected to the gear housing 14 via a flange screw connection 23 arranged essentially parallel to the output shaft 16.
  • the bearing flange 22 has a cylindrical neck 24 emerging at right angles to the longitudinal axis 13, which receives the protective hood 43 on its outer circumference and which, for this purpose, has an annular groove 26 axially approximately centrally, its outer bead-like annular groove limitation 27 being interspersed at regular intervals by axial grooves 28, the corresponding radial cams 46 in the collar 44 are assigned to the protective hood 43 and which - to match one another - can be coupled in a plug-and-turn movement, such as a key-keyhole or bayonet lock system.
  • the protective hood 43 consists of a disk-like, crescent-shaped base body 53 with a central hole 55, the outer edge 54 of which is angled and thus runs like a partial cylinder jacket.
  • This base body 50 encompasses approximately half the circumference of a circular disk-shaped grinding body, not shown, which is rotatably carried along by the drive shaft 16, as is customary in the case of angle grinders.
  • the base body 50 is connected to an annular collar 44 which has an area 45 which is angled laterally outwards in the manner of a hat. This runs parallel to the perforated disk 52 of the base body 50 and concentrically to the central hole 55 of the perforated disk 52.
  • the collar 44 can be connected to the base body 50 by gluing, welding, soldering or the like.
  • the collar 44 has latching openings 48, into which latching cams 32 of a latching lever 30 fit and enter and thus secure the protective hood 43 against twisting on the gear housing 14.
  • the respective different widths and the corresponding height of the radial cams 46 are dimensionally matched to the matching, uniformly wide ring 26 and differently wide axial grooves 28 on the neck 24. It is only possible to guide protective hoods 43 with their collar axially over the neck 24 and to fasten them in a manner suitable for the operation.
  • a particularly slotted snap ring-like ring spring 40 has to be pushed axially over the neck 24 by the manufacturer, its spring cam 42 having to be passed through one of the axial grooves 28 and then - if necessary after radial rotation - caulked in the ring groove 26 or by opening or bending fixed in a pocket 41 on the lower edge of the neck 24 and thus secured against loss.
  • the protective hood 43 with the radial cams 46 is then guided over the axial grooves 28 of the neck 24 until the radial cams 46 abut the lower edge of the annular groove 26 and the protective hood 43 can only be rotated, the radial cams 46 being laterally inserted into the annular groove 26 in the manner of a bayonet lock enter and hold in there against axial emergence, axially pretensioned and thus kept free of play by the ring spring 40.
  • the latching lever 30 On its side remote from the housing, the latching lever 30 has an area with latching cams 32 which are intended to engage in the latching openings 48.
  • the locking lever 30 carries at one end a bore which is offset by approximately 90 from the locking cams 32 and through which a flange screw 18 can be guided, for screwing into a specific flange bore 20 and which serves as the pivot axis 34 of the locking lever.
  • the locking lever 30 carries a transversely projecting, captively attachable compression spring 36, with which the locking lever 30 is pretensioned on the gear housing 14 so that it always has a minimum force with its cams 32 on the bend 45 of the bracket.
  • gens 44 can support and the entry of the locking cams 32 is secured in the locking openings 48.
  • the base body 50 of the protective hood 43 has welding holes 53 through which the base body 50 can be welded or soldered to the collar 44 or to the bend 45.
  • FIG. 2 shows, like FIG. 1, the three-dimensional view of hand-held power tool 10 with protective hood 43, protective hood 43 being completed and joined by welding at welding holes 53 and forming a unit with collar 44.
  • FIG. 2 shows an axial arrow 58, according to which the protective hood 43 must be pushed over the neck 24 and then rotated according to a rotating arrow 60 such that the rounding of the base body 50 is rotated relative to the position shown.
  • a rotating arrow 60 such that the rounding of the base body 50 is rotated relative to the position shown.
  • an end region of the latching lever 30 designed as a pushbutton 38 must be pivoted away from the protective hood 43 toward the transmission housing 14, so that the two latching cams 32 emerge from the two opposite latching openings 48 and do not hinder a rotation of the protective hood 43 , Only in the desired rotational position is the locking lever 30 released so that it can be biased by the compression spring 36 with its locking cams 32 to engage in the locking openings 48 and protect the protective hood 43 against unintentional adjustment.
  • FIG. 3 shows a further exemplary embodiment of a protective hood 430, which differs from the protective hood 43 from FIGS. 1 and 2 in that the collar 440 is made of plastic or metal, which engages with corresponding snap-in projections 65 of the base body 500 with snap hooks 64 that extend radially outward can by going through the central hole 51 is inserted and fixed by snapping, so that its angled, hat-like region 66 comes to rest on the base body 500.
  • the latching openings 48 are arranged in the base body 500, which must accordingly have a larger dimension in order to be able to absorb the latching forces or retaining forces for fixing the protective hood 24 on the transmission housing 14 by means of the latching lever 30.
  • FIG. 4 shows the protective hood 430 in the assembled state, it being recognizable that the snap hooks 64 stand radially outward and overlap the base body 500 and secure it in position with respect to the collar 440.
  • FIG. 5 shows a further example of a dismantled protective hood 432, the collar 441 of which is welded to the base body 501 and thus essentially corresponds to the protective hood 43 according to FIG. 2.
  • FIG. 6 shows the protective hood 432, it going beyond the previous figures that the welding holes 53 are welded to the collar 44.
  • FIG. 7 shows a protective hood 434, the collar ring 48 of which is made of plastic, which is molded onto the base body 504 in the region of the central hole 51.
  • FIG. 8 shows a one-piece protective hood 433 made of steel, in which, as in FIG. 7, the latching openings 48 are arranged in the base body 502 (504), the advantage of this protective hood being that it can be produced in a single operation, even if in this case, the material expenditure is more complex than with the other variants.

Abstract

The invention relates to a portable power tool, especially an angle grinder (10), comprising an elongate housing (12) which receives a motor for driving a driven shaft (16) that is bent relative to the housing (12). Said shaft is rotatably mounted in a transmission housing (14) and projects therefrom with one free provided for receiving an abrasive body. A protective cover (43) enclosing the abrasive body is fastened on the transmission housing (14) so as to be adjusted by rotation, the rotational position thereof being lockable by means of a detent lever (30). The aim of the invention is to provide a portable power tool of the aforementioned type that can be manufactured in a functionally reliable and cost-effective manner. For this purpose, the detent lever (30) is mounted perpendicularly to the longitudinal axis of the angle grinder (10) and can be swiveled about an axis (34) that is substantially parallel to the housing (12).

Description

Handwerkzeugmaschine mit SchutzhaubeHand tool with protective hood
Stand der TechnikState of the art
Die vorliegende Erfindung geht aus von einer Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1.The present invention is based on a hand tool according to the preamble of claim 1.
Aus der DE 199 14 855 AI ist bereits eine Handwerkzeugmaschine bekannt, die als Winkelschleifer ausgestaltet ist und die mit einer Schutzhaube versehen ist, deren Drehposition in Umfangsrichtung mit einem einfachen, lösbaren Arretiermechanismus festlegbar ist. Dessen Arretierglied besteht im wesentlichen aus einer Blattfeder, deren Vorsprünge zum Verstellen der Schutzhaube von Hand außer Eingriff mit Vertiefungen der Schutzhaube bringbar sind und deren Arretierkräfte unter hartem Baustellenbetrieb durch Verformung des Arretiergliedes beeinträchtigt sind.From DE 199 14 855 AI a hand tool is already known, which is designed as an angle grinder and is provided with a protective hood, the rotational position of which can be fixed in the circumferential direction with a simple, releasable locking mechanism. Whose locking member consists essentially of a leaf spring, the projections for adjusting the protective hood can be brought out of engagement with recesses of the protective hood by hand and whose locking forces are impaired by deformation of the locking member under hard construction site operation.
Vorteile der ErfindungAdvantages of the invention
Die Erfindung mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass an herkömmlichen Handwerkzeugmaschinen, insbesondere Winkelschleifern, ohne konstruktive Veränderung eine Schutzhaube mit zugehöriger robuster, einfacher Schutzhaubenarretierung einbaubar ist, mit der die Schutzhaube in jeder Drehposition zuverlässig festlegbar ist.The invention with the features of claim 1 has the advantage that a protective hood with associated robust, simple protective hood locking device can be installed on conventional hand-held power tools, in particular angle grinders, with which the protective hood can be reliably fixed in any rotational position.
Dadurch, dass der Rasthebel quer zur Längsachse des Winkelschleifers angeordnet und um eine im wesentlichen parallel zum Gehäuse angeordnete Achse schwenkbar ist, sind die Bewegungsbahnen des Rasthebels festgelegt und damit Veränderungen in der Arretiercharakteristik der Schutzhaube auszuschließen.Characterized in that the locking lever is arranged transversely to the longitudinal axis of the angle grinder and can be pivoted about an axis arranged essentially parallel to the housing, the movement paths of the locking lever are fixed and changes in the locking characteristics of the protective hood are thus excluded.
Dadurch, dass der Rasthebel in einer Rastposition die Schutzhaube berührt, ist in dieser Position die Schutzhaube kraft- oder formschlüssig sicherbar.Because the locking lever touches the protective hood in a locking position, the protective hood can be secured in a non-positive or positive manner in this position.
Dadurch, dass der Rasthebel zur Schutzhaube weisend elastisch vorgespannt ist, ist ein ständiger Kontakt zwischen dem Rasthebel und der Schutzhaube gesichert.Due to the fact that the locking lever is elastically pretensioned pointing towards the protective hood, constant contact between the locking lever and the protective hood is ensured.
Dadurch, dass der Rasthebel am freien Ende eine Drucktaste und am anderen Ende und/oder mittig mindestens einen Rastnocken trägt, der in die Schutzhaube eingreift und diese formschlüssig festhält, ist ein einfach bedienbares, robustes und genaues Rastmittel geschaffen.Characterized in that the locking lever carries a push button at the free end and at the other end and / or in the middle at least one locking cam which engages in the protective hood and holds this form-fitting, an easy-to-use, robust and accurate locking means is created.
Dadurch, dass der Rasthebel am Gehäuse, insbesondere am Getriebegehäuse, schwenkbar gelagert ist, sind Funktion und Montage des Rasthebels nur durch Lösen und neu Ver- schrauben einer Flanschschraube herstellbar.Due to the fact that the locking lever is pivotally mounted on the housing, in particular on the gear housing, the function and assembly of the locking lever can only be achieved by loosening and re-screwing a flange screw.
Dadurch, dass die Drucktaste des Rasthebels quer zum Getriebegehäuse und über dessen Umfang hinaussteht, ist sie leicht zugänglich für mindestens einen Finger, insbesondere den Zeigefinger der das Gehäuse in Arbeitsposition umgreifenden Bedienhand ist die Schutzhaube bequem und schnell einstellbar und Fehlbedienung ausgeschlossen.The fact that the push button of the locking lever extends transversely to the transmission housing and beyond its circumference makes it easily accessible for at least one finger, in particular the index finger of the operating hand that grips the housing in the working position, the protective hood can be adjusted quickly and easily and incorrect operation is prevented.
Dadurch, dass die Schutzhaube formschlüssig mit den starren Rastnocken in Eingriff bringbar ist, ist eine weitgehend spielfreie, gegen ungewolltes Lösen sichere Positionierung der Schutzhaube in beliebigen Drehpositionen möglich.Because the protective hood can be positively engaged with the rigid locking cams, it is possible to position the protective hood in any rotational position in a largely play-free manner and secure against unintentional loosening.
Dadurch, dass das Getriebegehäuse einen Flansch hat, der an das Gehäuse schraubbar ist, wobei eine der Flansschrauben zugleich als Drehachse des Rasthebels dient, sind die Arretiermittel der Winkelschleiferschutzhäube leicht an herkömmliche Winkelschleifer anbaubar.Because the gear housing has a flange that can be screwed onto the housing, with one of the flange screws also serving as the axis of rotation of the locking lever, the locking means of the angle grinder protection hood can be easily attached to conventional angle grinders.
Dadurch, dass die Schutzhaube auf einem Teilkreis Rastöffnungen zum Eingriff von Rastnocken des Rasthebels aufweist, ist eine sichere, formschlüssige Arretierung der Schutzhaube in vorbestimmten Drehpositionen gegenüber der Handwerkzeugmaschine möglich.Because the protective hood has latching openings on a pitch circle for engaging latching cams of the latching lever, a secure, positive locking of the protective hood in predetermined rotational positions with respect to the hand-held power tool is possible.
Dadurch, dass die Schutzhaube mehrteilig ausgebildet ist, wobei als erster Teil ein ringartiger Kragen, insbesondere mit abgewinkeltem Randbereich, aus starkem Material besteht, und ein zweiter Teil ein scheibenartiger Grundkörper ist, ist die Schutzhaube aus unterschiedlichen Werkstoffen besonders kostengünstig herstellbar, weil die Teile unabhängig voneinander günstiger bearbeitbar sind und die Schutzhaube als Leichtbauteil herstellbar ist.Due to the fact that the protective hood is made of several parts, the first part being a ring-like collar, in particular with an angled edge area, made of strong material, and the second part being a disk-like base body, the protective hood can be produced from different materials in a particularly cost-effective manner because the parts are independent are easier to edit from each other and the protective hood can be manufactured as a lightweight component.
Dadurch, dass der ringartige Kragenteil einen abgewinkelten, hutrandartigen Bereich aufweist, der die Rastöffnungen trägt, kann der zweite Teil, nämlich der Schutzhauben- grundkörper, aus besonders dünnem Material gefertigt sein, weil allein das Kragenteil die Arretierungskräfte zwischen den Rastöffnungen und den Rastnocken des Rasthebels aufnimmt.Because the ring-like collar part has an angled, hat-like region which carries the latching openings, the second part, namely the protective hood basic body, be made of particularly thin material, because only the collar part absorbs the locking forces between the locking openings and the locking cams of the locking lever.
Dadurch, dass im Befestigungsbereich der Winkelschleiferschutzhaube am Hals des Getriebegehäuses eine Ringblattfeder vorgesehen ist, die die Schutzhaube axial spielfrei radial drehbar am Getriebegehäuse hält, kann der Befestigungsbereich des Getriebegehäuses, der die Schutzhaube trägt, aus verhältnismäßig grob toleriertem Kunststoff bestehen, weil die Ring-Blattfeder Maßabweichungen bzw. Verschleiß im Befestigungsbereich ausgleicht.Due to the fact that an annular leaf spring is provided in the attachment area of the angle grinder protective cover on the neck of the gearbox housing, which holds the protective cover axially free of rotation and radially on the gearbox housing, the attachment area of the gearbox housing that carries the protective cover can be made of relatively roughly tolerated plastic, because the ring leaf spring Compensates for dimensional deviations or wear in the fastening area.
Dadurch, dass das Getriebegehäuse einen als zylindrischen Kunststofϊhals ausgestalteten Befestigungsbereich für die Schutzhaube hat, der zu einem die Abtriebswelle konzentrisch umgreifenden Lagerflansch gehört, kann am Getriebegehäuse und damit an der gesamten Handwerkzeugmaschine Gewicht eingespart werden, so dass die Handwerkzeugmaschine handlicher ist und ermüdungsfrei gehandhabt werden kann.The fact that the gear housing has a fastening area for the protective hood designed as a cylindrical plastic neck, which belongs to a bearing flange concentrically encompassing the output shaft, can save weight on the gear housing and thus on the entire hand tool, so that the hand tool is more manageable and can be handled without fatigue ,
ZeichungenDrawings
Nachstehend ist die Erfindung anhand eines Ausfuhrungsbeispiels mit zugehörigen Zeichnungen näher erläutert.The invention is explained in more detail below on the basis of an exemplary embodiment with associated drawings.
Es zeigenShow it
Figur 1 die Handwerkzeugmaschine mit Schutzhaube in Explosionsdarstellung,FIG. 1 shows the handheld power tool with protective hood in an exploded view,
Figur 2 die Handwerkzeugmaschine gemäß Figur 1 mit zusammengebauter Schutzhaube vor dem Zusammenfügen, Figur 3 die Einzelteile eines zweiteiligen Ausfuhrungsbeispiels der Schutzhaube Figur 4 die Schutzhaube gemäß Figur 3 zusammengebaut,2 shows the hand-held power tool according to FIG. 1 with the protective hood assembled before assembly, FIG. 3 shows the individual parts of a two-part exemplary embodiment of the protective hood, FIG. 4 assembles the protective hood according to FIG. 3,
Figur 5 ein zweites Ausführungsbeispiel einer zweiteiligen Schutzhaube - in Explosionsdarstellung, Figur 6 das Ausführungsbeispiel gemäß Figur 5, zusammengebaut,5 shows a second exemplary embodiment of a two-part protective hood — in an exploded view, FIG. 6 shows the exemplary embodiment according to FIG. 5, assembled,
Figur 7 eine zweiteilige Schutzhaube mit Kunststoffkragen und Metallgrundkörper und Figur 8 eine einstückige erfϊndungsgemäße Schutzhaube aus Metall.Figure 7 is a two-part protective hood with plastic collar and metal body and Figure 8 is a one-piece protective hood made of metal.
Ausführungsbeispielembodiment
Figur 1 zeigt den vorderen Bereich einer als Winkelschleifer ausgestalteten Handwerk- zeugmaschine 10, deren längliches Gehäuse 12 eine Längsachse 13 der Handwerkzeugmaschine 10 bestimmt. An das Gehäuse 12 ist ein Getriebegehäuse 14 angeflanscht, aus dem rechrwinklig zur Längsachse 13 eine Abtriebswelle 16 tritt. An deren freies Ende ist eine nicht dargestellte Schleifscheibe befestigbar, die zum Schutz des die Handwerkzeugmaschine 10 Bedienenden vor umherfliegenden Spänen bzw. Teilen der Schleifscheibe von einer Schutzhaube 43 umgriffen wird.FIG. 1 shows the front area of a hand tool 10 designed as an angle grinder, the elongated housing 12 of which defines a longitudinal axis 13 of the hand tool 10. A gear housing 14 is flanged to the housing 12, from which an output shaft 16 emerges at right angles to the longitudinal axis 13. At its free end a grinding wheel, not shown, can be fastened, which is encased by a protective hood 43 to protect the operator of the handheld power tool 10 from flying chips or parts of the grinding wheel.
Das Getriebegehäuse 14 ist am Gehäuse 12 mit Flanschschrauben 18 befestigt, die in parallel zur Längsachse 13 verlaufende Flanschbohrungen 20 greifen und es trägt einen Lagerflansch 22, der die Abtriebswelle 16 ringartig umgreift. Der Lagerflansch 22 ist in dem dem Getriebegehäuse 14 zugewandten Bereich plattenartig ausgestaltet und über eine im Wesentlichen parallel zur Abtriebswelle 16 angeordnete Flanschverschraubung 23 mit dem Getriebegehäuse 14 verbindbar.The gear housing 14 is fastened to the housing 12 with flange screws 18 which engage in flange bores 20 running parallel to the longitudinal axis 13 and it carries a bearing flange 22 which surrounds the output shaft 16 in a ring-like manner. The bearing flange 22 is designed in a plate-like manner in the area facing the gear housing 14 and can be connected to the gear housing 14 via a flange screw connection 23 arranged essentially parallel to the output shaft 16.
Der Lagerflansch 22 ragt hat einen rechtwinklig zur Längsachse 13 oben austretenden zylindrischen Hals 24, der auf seinem Außenumfang die Schutzhaube 43 aufnimmt und der dazu axial etwa mittig eine Ringnut 26 trägt, wobei seine äußere wulstartige Ringnutbegrenzung 27 in regelmäßigem Abstand von Axialnuten 28 durchsetzt ist, die entsprechenden Radialnocken 46 im Kragen 44 der Schutzhaube 43 zugeordnet sind und die - zueinander passend - in einer Steck-Drehbewegung zu kuppeln sind, wie ein Schlüssel-Schlüsselloch- bzw. Bajonettverschluss-System.The bearing flange 22 has a cylindrical neck 24 emerging at right angles to the longitudinal axis 13, which receives the protective hood 43 on its outer circumference and which, for this purpose, has an annular groove 26 axially approximately centrally, its outer bead-like annular groove limitation 27 being interspersed at regular intervals by axial grooves 28, the corresponding radial cams 46 in the collar 44 are assigned to the protective hood 43 and which - to match one another - can be coupled in a plug-and-turn movement, such as a key-keyhole or bayonet lock system.
Die Schutzhaube 43 besteht aus einem scheibenartigen, halbmondförmigen Grundkörper 53 mit einem zentralen Loch 55, dessen äußerer Rand 54 abgewinkelt ist und dadurch teilzylindermantelartig verläuft. Dieser Grundkörper 50 umgreift etwa hälftig den Umfang eines kreisscheibenfÖrmigen, nicht dargestellten Schleifkörpers, der von der Ab- trϊebswelle 16 drehend mitgenommen wird, wie bei Winkelschleifern üblich. Der Grundkörper 50 ist mit einem kreisringförmigen Kragen 44 verbunden, der einen hutrandartig seitlich nach außen abgewinkelten Bereich 45 hat. Dieser verläuft parallel zur Lochscheibe 52 des Grundkörpers 50 und konzentrisch zum zentralen Loch 55 der Lochscheibe 52. Der Kragen 44 ist durch Kleben, Schweißen, Löten oder dergl. mit dem Grundkörper 50 verbindbar. Er hat eingeprägte, radial nach innen vorstehende Radialnocken 46. Diese stimmen maßlich mit den Axialnuten 28 im Hals 24 des Lagerflansches 22 so überein, dass sie diese durch axiales Stecken durchtreten, um dann in die Ringnut 26 durch radiales Drehen einzutreten und dort die Schutzhaube 43 axial gesichert festzuhalten. In seinem hutrandartig abgewinkelten Bereich trägt der Kragen 44 Rastöffnungen 48, in die Rastnocken 32 eines Rasthebels 30 passen und eintreten und damit die Schutzhaube 43 gegen Verdrehen am Getriebegehäuse 14 zu sichern.The protective hood 43 consists of a disk-like, crescent-shaped base body 53 with a central hole 55, the outer edge 54 of which is angled and thus runs like a partial cylinder jacket. This base body 50 encompasses approximately half the circumference of a circular disk-shaped grinding body, not shown, which is rotatably carried along by the drive shaft 16, as is customary in the case of angle grinders. The base body 50 is connected to an annular collar 44 which has an area 45 which is angled laterally outwards in the manner of a hat. This runs parallel to the perforated disk 52 of the base body 50 and concentrically to the central hole 55 of the perforated disk 52. The collar 44 can be connected to the base body 50 by gluing, welding, soldering or the like. It has embossed, radially inwardly projecting radial cams 46. These correspond in size to the axial grooves 28 in the neck 24 of the bearing flange 22 in such a way that they penetrate them by axial insertion, in order then to enter the annular groove 26 by radial rotation and there the protective cover 43 to hold axially secured. In its hat-like angled area, the collar 44 has latching openings 48, into which latching cams 32 of a latching lever 30 fit and enter and thus secure the protective hood 43 against twisting on the gear housing 14.
Die jweilige unterschiedlichen Breiten und die übereinstimmende Höhe der Radialnocken 46 sind maßlich auf die damit übereinstimmend, einheitlich breite Ring- 26 und unterschiedlich breiten Axialnuten 28 am Hals 24 abgestimmt. Es können nur zum jeweilig codierbar genuteten Hals 24 passende Schutzhauben 43 mit ihrem Kragen axial über den Hals 24 geführt und an diesem betriebsgerecht befestigt werden. Dazu ist zuvor herstel- lerseitig eine insbesondere geschlitzte sprengringartige Ringfeder 40 axial über den Hals 24 zu schieben, wobei ihr Fedemocken 42 durch eine der Axialnuten 28 zu flihren ist und sodann - ggf. nach radialem Verdrehen - in der Ringnut 26 verstemmt oder durch Aufoder Umbiegen in einer Tasche 41 am Unterrand des Halses 24 fixiert und damit gegen Verlieren gesichert.The respective different widths and the corresponding height of the radial cams 46 are dimensionally matched to the matching, uniformly wide ring 26 and differently wide axial grooves 28 on the neck 24. It is only possible to guide protective hoods 43 with their collar axially over the neck 24 and to fasten them in a manner suitable for the operation. For this purpose, a particularly slotted snap ring-like ring spring 40 has to be pushed axially over the neck 24 by the manufacturer, its spring cam 42 having to be passed through one of the axial grooves 28 and then - if necessary after radial rotation - caulked in the ring groove 26 or by opening or bending fixed in a pocket 41 on the lower edge of the neck 24 and thus secured against loss.
Bedienerseitig wird dann die Schutzhaube 43 mit den Radialnocken 46 über die Axialnuten 28 des Halses 24 geführt, bis die Radialnocken 46 am unteren Rand der Ringnut 26 anschlagen und die Schutzhaube 43 nur noch verdreht werden kann, wobei die Radialnocken 46 bajonettverschlussartig seitlich in die Ringnut 26 eintreten und sich darin gegen axiales Heraustreten festhalten, axial vorgespannt und damit spielfrei gehalten durch die Ringfeder 40.On the operator side, the protective hood 43 with the radial cams 46 is then guided over the axial grooves 28 of the neck 24 until the radial cams 46 abut the lower edge of the annular groove 26 and the protective hood 43 can only be rotated, the radial cams 46 being laterally inserted into the annular groove 26 in the manner of a bayonet lock enter and hold in there against axial emergence, axially pretensioned and thus kept free of play by the ring spring 40.
Der Rasthebel 30 weist auf seiner gehäusefernen Seite oben einen Bereich mit Rastnocken 32 auf, die zum Eingriff in die Rastöffnungen 48 bestimmt sind. Außerdem trägt der Rasthebel 30 am einen Ende eine zu den Rastnocken 32 um etwa 90 versetzt verlaufende Bohrung, durch die eine Flanschschraube 18 führbar ist, zum Einschrauben in eine bestimmte Flanschbohrung 20 und die als Schwenkachse 34 des Rasthebels dient. Etwa mittig trägt der Rasthebel 30 eine quer abstehende, unverlierbar befestigbare Druckfeder 36, mit der sich der Rasthebel 30 am Getriebegehäuse 14 vorgespannt so abstützt, dass er sich stets mit einer Mindestkraft mit seinen Nocken 32 an der Abwinkelung 45 des Kra- gens 44 abstützen kann und der Eintritt der Rastnocken 32 in die Rastöffnungen 48 gesichert ist.On its side remote from the housing, the latching lever 30 has an area with latching cams 32 which are intended to engage in the latching openings 48. In addition, the locking lever 30 carries at one end a bore which is offset by approximately 90 from the locking cams 32 and through which a flange screw 18 can be guided, for screwing into a specific flange bore 20 and which serves as the pivot axis 34 of the locking lever. Approximately in the middle, the locking lever 30 carries a transversely projecting, captively attachable compression spring 36, with which the locking lever 30 is pretensioned on the gear housing 14 so that it always has a minimum force with its cams 32 on the bend 45 of the bracket. gens 44 can support and the entry of the locking cams 32 is secured in the locking openings 48.
Der Grundkörper 50 der Schutzhaube 43 weist Schweißlöcher 53 auf, durch die hindurch der Grundkörper 50 mit dem Kragen 44 bzw. mit der Abwinkelung 45 verschweißbar bzw. verlötbar sind.The base body 50 of the protective hood 43 has welding holes 53 through which the base body 50 can be welded or soldered to the collar 44 or to the bend 45.
Figur 2 zeigt, wie die Figur 1, die räumliche Ansicht der Handwerkzeugmaschine 10 mit der Schutzhaube 43, wobei die Schutzhaube 43 komplettiert und durch Schweißen an den Schweißlöchern 53 zusammengefügt ist und mit dem Kragen 44 eine Einheit bildet.FIG. 2 shows, like FIG. 1, the three-dimensional view of hand-held power tool 10 with protective hood 43, protective hood 43 being completed and joined by welding at welding holes 53 and forming a unit with collar 44.
An der Handwerkzeugmaschine 10 ist in Figur 2 nur das Getriebegehäuse 14 gezeigt, wobei die in Figur 1 explosionsartig auseinandergezogen gezeigten Einzelteile in der fertig montierten Position liegen und daraus die Anordnung des Rasthebels 30 deutlich klar wird. Über die Figur 1 hinausgehend zeigt Figur 2 einen Axialpfeil 58, dem entsprechend die Schutzhaube 43 über den Hals 24 zu schieben und sodann gemäß einem Drehpfeil 60 derart zu verdrehen ist, dass die Rundung des Grundkörpers 50 gegenüber der gezeigten Position verdreht ist. Damit sind in der Verlängerung der Längsachse 13 hinter der Werkzeugeingriffsstelle befindliche Bedienpersonen entsprechend gegen Staub, Späne, Splitter oder dergl. geschützt.Only the gear housing 14 is shown on the hand-held power tool 10 in FIG. 2, the individual parts shown exploded in FIG. 1 lying in the fully assembled position, and the arrangement of the latching lever 30 is clearly evident therefrom. Going beyond FIG. 1, FIG. 2 shows an axial arrow 58, according to which the protective hood 43 must be pushed over the neck 24 and then rotated according to a rotating arrow 60 such that the rounding of the base body 50 is rotated relative to the position shown. In this way, operators located in the extension of the longitudinal axis 13 behind the tool engagement point are appropriately protected against dust, chips, splinters or the like.
Zum Verdrehen der Schutzhaube 43 aus einer gewählten Rastposition muss ein als Drucktaste 38 ausgebildeter Endbereich des Rasthebels 30 zum Getriebegehäuse 14 hin von der Schutzhaube 43 weggeschwenkt werden, damit die zwei Rastnocken 32 aus den zwei gegenüberliegenden Rastöffnungen 48 austreten und ein Verdrehen der Schutzhaube 43 nicht behindern. Erst in der gewünschten Drehposition wird der Rasthebel 30 losgelassen, so dass er vorgespannt durch die Druckfeder 36 mit seinen Rastnocken 32 in die Rastöffnungen 48 eingreifen und die Schutzhaube 43 gegen ungewolltes Verstellen sichern kann.To rotate the protective hood 43 from a selected latching position, an end region of the latching lever 30 designed as a pushbutton 38 must be pivoted away from the protective hood 43 toward the transmission housing 14, so that the two latching cams 32 emerge from the two opposite latching openings 48 and do not hinder a rotation of the protective hood 43 , Only in the desired rotational position is the locking lever 30 released so that it can be biased by the compression spring 36 with its locking cams 32 to engage in the locking openings 48 and protect the protective hood 43 against unintentional adjustment.
Figur 3 zeigt ein weiteres Ausführungsbeispiel einer Schutzhaube 430, die sich dadurch von der Schutzhaube 43 aus Figur 1 und 2 unterscheidet, dass der Kragen 440 aus Kunststoff oder Metall besteht, der mit radial nach außen tretenden Schnapphaken 64 in entsprechende Rastvorsprünge 65 des Grundkörpers 500 eingreifen kann, indem er durch das zentrale Loch 51 gesteckt wird und durch Überrasten fixiert wird, so dass sein abgewinkelter, hutrandartiger Bereich 66 zur Anlage an den Grundkörper 500 kommt.FIG. 3 shows a further exemplary embodiment of a protective hood 430, which differs from the protective hood 43 from FIGS. 1 and 2 in that the collar 440 is made of plastic or metal, which engages with corresponding snap-in projections 65 of the base body 500 with snap hooks 64 that extend radially outward can by going through the central hole 51 is inserted and fixed by snapping, so that its angled, hat-like region 66 comes to rest on the base body 500.
Die Rastöffnungen 48 sind in diesem Fall im Grundkörper 500 angeordnet, der dementsprechend stärker dimensioniert sein muss, um die Rastkräfte bzw. Festhaltekräfte zum Festlegen der Schutzhaube 24 am Getriebegehäuses 14 durch den Rasthebel 30 aufnehmen zu können.In this case, the latching openings 48 are arranged in the base body 500, which must accordingly have a larger dimension in order to be able to absorb the latching forces or retaining forces for fixing the protective hood 24 on the transmission housing 14 by means of the latching lever 30.
Figur 4 zeigt die Schutzhaube 430 in montiertem Zustand, wobei erkennbar ist, dass die Schnapphaken 64 radial nach außen stehen und den Grundkörper 500 übergreifen und gegenüber dem Kragen 440 lagesichern. Figur 5 zeigt ein weiteres Alisführungsbeispiel einer demontierten Schutzhaube 432, deren Kragen 441 mit dem Grundkörper 501 verschweißt ist und dadurch im Wesentlichen der Schutzhaube 43 gemäß Figur 2 entspricht.FIG. 4 shows the protective hood 430 in the assembled state, it being recognizable that the snap hooks 64 stand radially outward and overlap the base body 500 and secure it in position with respect to the collar 440. FIG. 5 shows a further example of a dismantled protective hood 432, the collar 441 of which is welded to the base body 501 and thus essentially corresponds to the protective hood 43 according to FIG. 2.
Figur 6 zeigt die Schutzhaube 432, wobei über die vorhergehenden Figuren hinausgeht, dass die Schweißlöcher 53 verschweißt mit dem Kragen 44 zeigen.FIG. 6 shows the protective hood 432, it going beyond the previous figures that the welding holes 53 are welded to the collar 44.
Figur 7 zeigt eine Schutzhaube 434, deren Kragenring 48 aus Kunststoff besteht, der an den Grundkörper 504 im Bereich des zentralen Lochs 51 an dieses angespritzt ist.FIG. 7 shows a protective hood 434, the collar ring 48 of which is made of plastic, which is molded onto the base body 504 in the region of the central hole 51.
Figur 8 zeigt eine einstückige Schutzhaube 433 aus Stahl, bei der, wie auch in Figur 7, die Rastöffnungen 48 im Grundkörper 502 (504) angeordnet sind, wobei der Vorteil dieser Schutzhaube darin besteht, dass sie in einem einzigen Arbeitsgang herstellbar ist, wenn auch der Materialaufwand in diesem Fall aufwändiger ist, als bei den anderen Varianten. FIG. 8 shows a one-piece protective hood 433 made of steel, in which, as in FIG. 7, the latching openings 48 are arranged in the base body 502 (504), the advantage of this protective hood being that it can be produced in a single operation, even if in this case, the material expenditure is more complex than with the other variants.

Claims

Ansprüche Expectations
1. Handwerkzeugmaschine, insbesondere Winkelschleifer (10), mit einem länglichen Gehäuse (12) zur Aufnahme eines Motors zum Antrieb einer zum Gehäuse (12) abgewinkelten Abtriebswelle (16), die in einem Getriebegehäuse (14) drehbar gelagert ist und aus diesem mit einem freien Ende heraustritt, das zur Aufnahme eines Schleifkörpers vorgesehen ist, wobei eine den Schleifkörper umgreifende Schutzhaube (43) am Getriebegehäuse (14) dreheinstellbar befestigbar und deren Drehposition mittels eines Rasthebels (30) arretierbar ist, dadurch gekennzeichnet, dass der Rasthebel (30) quer zur Längsachse des Winkelschleifers (10) angeordnet und um eine i.w. parallel zum Gehäuse (12) angeordnete Achse 3 ) schwenkbar ist.1. hand tool, in particular angle grinder (10), with an elongated housing (12) for receiving a motor for driving an output shaft (16) angled to the housing (12), which is rotatably mounted in a gear housing (14) and from this with a comes out free end, which is provided for receiving a grinding wheel, a protective hood (43) surrounding the grinding wheel being rotatably attachable to the gear housing (14) and the rotational position of which can be locked by means of a locking lever (30), characterized in that the locking lever (30) is transverse arranged to the longitudinal axis of the angle grinder (10) and by an iw axis 3) arranged parallel to the housing (12) can be pivoted.
2. Handwerkzeugmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der Rasthebel (30) in einer Rastposition die Schutzhaube (43) berührt2. Hand tool according to claim 1, characterized in that the latching lever (30) touches the protective hood (43) in a latching position
3. Handwerkzeugmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Rasthebel (30) zur Schutzhaube (43) hin gerichtet elastisch vorgespannt ist3. Hand tool according to claim 1 or 2, characterized in that the locking lever (30) towards the protective hood (43) is elastically biased towards
4. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeich- net,dass der Rasthebel (30) mittig zur Schutzhaube gerichtete Eingriffsnocken (32) und am freien Ende eine Drückertaste (38) hat.4. Hand tool according to one of claims 1 to 3, characterized in that the latching lever (30) has engagement cams (32) centered on the protective hood and a push button (38) at the free end.
5. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeich- net,dass der Rasthebel (30) am Gehäuse (12, 14) , insbesondere am Getriebegehäuse (14), befestigt ist.5. Hand tool according to one of claims 1 to 4, characterized in that the locking lever (30) on the housing (12, 14), in particular on the gear housing (14), is attached.
6. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 5, dadurch gekennzeich- net,dass die Drückertaste (38) des Rasthebels (30) quer zum Getrϊebegehäuse (14) und dessen Umfang hinaussteht, so dass sie bequem zugänglich ist für mindestens einen Finger, insbesondere den Zeigefinger, der das Gehäuse (12) in Arbeitsposition umgreifenden Bedienhand.6. Hand tool according to one of claims 1 to 5, characterized in that the push button (38) of the latching lever (30) extends transversely to the gear housing (14) and its circumference, so that it is easily accessible for at least one finger, in particular the index finger of the operating hand that grips the housing (12) in the working position.
7. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 6, dadurch gekennzeich- net,dass das Getriebegehäuse (14) einen Getriebeflansch (17) hat, der an das Gehäuse (12) schraubbar ist, wobei eine der Flanschschrauben (18) zugleich als Schwenkachse (34) des Rasthebels (30) dient.7. Hand tool according to one of claims 1 to 6, characterized in that the gear housing (14) has a gear flange (17) which is attached to the housing (12) can be screwed, one of the flange screws (18) also serving as the pivot axis (34) of the locking lever (30).
8. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 7 ', dadurch gekennzeich- net,dass die Schutzhaube (43) formschlüssig mit den Eingriffs nocken (32) des Rasthebels (30) koppelbar ist.8. Hand tool according to one of claims 1 to 7 ' , characterized in that the protective hood (43) can be positively coupled to the engagement cam (32) of the latching lever (30).
9. Handwerkzeugmaschine nach einem der Ansprüche 1 bis 8., dadurch gekennzeich- net,dass die Schutzhaube (32) auf einem Teilkreis Eingriffsöffnungen (48) trägt, in die die Eingriffsnocken (32) des Rasthebels (30) einrastbar ist. 9. Hand tool according to one of claims 1 to 8, characterized in that the protective hood (32) carries on a pitch circle engagement openings (48) into which the engagement cams (32) of the latching lever (30) can be latched.
EP04762465A 2003-09-16 2004-07-22 Portable power tool with protective cover Active EP1663575B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10343060A DE10343060A1 (en) 2003-09-16 2003-09-16 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
PCT/DE2004/001615 WO2005035190A1 (en) 2003-09-16 2004-07-22 Portable power tool with protective cover

Publications (2)

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EP1663575A1 true EP1663575A1 (en) 2006-06-07
EP1663575B1 EP1663575B1 (en) 2008-01-02

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US (1) US7063606B2 (en)
EP (1) EP1663575B1 (en)
CN (1) CN100515677C (en)
DE (2) DE10343060A1 (en)
WO (1) WO2005035190A1 (en)

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DE502004005855D1 (en) 2008-02-14
CN1852785A (en) 2006-10-25
DE10343060A1 (en) 2005-04-07
US20050215186A1 (en) 2005-09-29
WO2005035190A1 (en) 2005-04-21
CN100515677C (en) 2009-07-22
EP1663575B1 (en) 2008-01-02
US7063606B2 (en) 2006-06-20

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