EP2651600A1 - Electric hand-power tool device with tool securing means - Google Patents

Electric hand-power tool device with tool securing means

Info

Publication number
EP2651600A1
EP2651600A1 EP12710267.1A EP12710267A EP2651600A1 EP 2651600 A1 EP2651600 A1 EP 2651600A1 EP 12710267 A EP12710267 A EP 12710267A EP 2651600 A1 EP2651600 A1 EP 2651600A1
Authority
EP
European Patent Office
Prior art keywords
tool
electric hand
spindle
hand tool
force
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
EP12710267.1A
Other languages
German (de)
French (fr)
Other versions
EP2651600B1 (en
Inventor
Ludwig KÜTHER
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.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke GmbH and Co
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 Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Publication of EP2651600A1 publication Critical patent/EP2651600A1/en
Application granted granted Critical
Publication of EP2651600B1 publication Critical patent/EP2651600B1/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
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • 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
    • 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
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power 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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/26—Accessories, e.g. stops

Definitions

  • the invention relates to an electric hand tool, in particular an angle grinder, in which a tool is arranged on a rotatable tool spindle.
  • the tool is usually mounted on the tool spindle in such a way that it tightens when Ar ⁇ BEITEN due to the force exerted by the workpiece on the tool counter-torque to the drive torque of the engine jostä- tig.
  • Elektrohand- were recently tool, in particular angle grinder, equipped with so-called spindle brakes that allow the user to brake the trailing tool, for example by means of a ticket ⁇ plate brake to apply the electric hand tool faster aside and can proceed to the next step.
  • the tension between the prior art flanges also depends on the nature of the braking process itself, that is, depending on whether the operator brakes more or less, said tension between the flanges will be higher or lower.
  • the above procedure leads to the fact that for the desired Lö ⁇ sen of the tool, in particular for a tool change, practically in each case a different torque must be applied by the operator;
  • the tension between the two flanges may have increased due to the previous braking operations such that a simple release of the tool by the operator is no longer possible, whereby he must resort to tools such as a pipe wrench to the tool at all to be able to change.
  • the present invention has the object, a simple and ro ⁇ buste security against the automatic release of a tool an electric hand tool device when braking to create, where ⁇ yet a simple tool change by an operator remains possible.
  • This object is achieved by the device having the features listed in claim 1.
  • the dependent claims relate to advantageous embodiments and variants of the invention.
  • the electric hand tool device according to the invention shows a ro ⁇ tierable tool spindle for receiving a tool, wherein the tool spindle has a support member for supporting the work ⁇ zeugs.
  • the support element is designed in the manner of ⁇ that the tool after it arrives at the receiving of the tool on the tool spindle in touching contact with the support element, on a path L against a force (F) along the tool spindle axially in the direction of the electric ⁇ hand tool device can be moved.
  • a counterforce is exerted on the work ⁇ tool when screwing the tool and the associated axial movement of the support element, which counteracts the axial movement of the tool.
  • the tool can, for example, be fixable on the tool spindle by means of a fastening nut; It is also conceivable that the tool itself has a thread which cooperates with a thread on the tool spindle.
  • Such tools in particular grinding or grinding discs, are also known by the term “Hubbed Wheel”. It is thus produced by the tightening of the tool on the tool spindle, a defined force F in the manner of a pre ⁇ stress, which improves the frictional engagement between the threads involved in fi ⁇ xieren the tool on the tool spindle.
  • the features described have the effect that the tool on the tool spindle against unintentional Lö ⁇ sen, as it can happen especially when braking the rotating tool spindle by means of a spindle brake, is secured.
  • This assurance is based essentially on the fact that even with a slight rotation of the threads involved in the release direction, the bias described above is at least partially maintained and thus still sufficient frictional engagement between the threads remains to hal still the tool on the tool spindle ⁇ Without the pretensioning described, the frictional engagement between the threads would be greatly reduced even with a slight rotation in the release direction, which would facilitate inadvertent complete loosening of the threads involved and thus inadvertent loss of the tool.
  • the described solution is largely independent of the way in which the tool is fastened to the tool spindle.
  • the solution according to the invention is also applicable to tools which themselves have a thread for fixing on a corresponding thread on the workpiece. have a generating spindle, so that there is a comparatively wei ⁇ tes field of application for the inventive solution.
  • a further advantage of the solution according to the invention is that the tool spindle can be braked rapidly due to the inventive measures, so that the operator can quickly set aside the handheld power tool equipped with the solution according to the invention after switching off and can turn to other tasks.
  • the implementation of the solution according to the invention requires no instruction from the operators, since the process of mounting a tool on an electric hand tool device equipped with the solution according to the invention differs nothing from the procedure with conventional electric hand tool devices.
  • the release of the tool is done over the prior art in an unchanged manner, in particular for Lö ⁇ sen of the present invention secured tool no increased force required; Also, no separate release mechanism must be operated by the operator.
  • the solution according to the invention is characterized in that it can be realized by means of a relatively simple, robust construction.
  • the support element can be designed as a resiliently deformable element in the axial direction, for example, from a hard rubber.
  • the support member may be formed as a movable in the axial direction against the force F element.
  • the support element in turn can be supported on an axially movable intermediate element and the intermediate element can be mounted on a spring element, which is ⁇ neterrorism supported on a fixed flange in the axial direction on the tool spindle.
  • Both the intermediate element and the spring element can be arranged rotationally fixed, but axially movable on the tool spindle.
  • the variant described also allows ⁇ if a structurally comparatively simple implementation of the invention. In this case, a desired force curve along the path L can be adjusted by the choice of the spring element.
  • the spring element may be a Tellerfe ⁇ of a spring ring or an alternative resilient element.
  • a stop for limiting the axial movement of the tool in the direction of the electric hand tool device is present, a defined preload can be set become. Furthermore, it is achieved by the stop that an operator when fixing the tool on the tool spindle receives a tactile feedback to the effect that the tool is ⁇ fixed sufficiently firmly.
  • the force F can be selected independently of the distance traveled along the entire path L, in particular constant.
  • Such a force curve can be achieved in particular by the Ver ⁇ use of a plate spring.
  • the force curve described causes the frictional engagement between the threads involved when braking the tool at a slight rotation of the thread initially increased in the release direction and thus enters the desired securing effect.
  • the force F can also increase monotonically along the path L.
  • the figure shows in a sectional view schematically roughly that portion of an electric hand tool device, in ahead ⁇ case of an angle grinder, which the tool, in this case carries a grinding wheel 1,.
  • a tool spindle in a transmission housing 2 3 rotatably mounted.
  • the bearing takes place in the case shown ⁇ game by means of a rolling bearing 4 and a ball bearing 5.
  • Also shown in the figure is rotatably connected to the tool spindle 3 ring gear 6, which is in engagement with a pinion 7 of a drive shaft 8.
  • the ball bearing 5 is adjoined on the tool spindle 3 by the flange 9 which is connected in a rotationally fixed manner to the tool spindle 3 and which, in the example shown, is screwed to the tool spindle 3.
  • a plate spring 10 is mounted as a spring element, on wel ⁇ cher a two-edge 11 is arranged as an intermediate element. The two-edge 11 is against the spring force of the plate spring
  • the axial movement of the two-edge 11 is on the device side by the stop 12 be ⁇ limits.
  • the two-edge 11 also carries the support element arranged on the tool spindle 3 in the direction of the grinding wheel, which in the present example is designed as a support flange 13.
  • the grinding wheel 1 is fixed in the example shown by means of the fastening nut 14 on the tool spindle 3.
  • the grinding wheel 1 is at least partially surrounded by the protective hood 15.
  • the grinding wheel 1 can be turned off after a shut-off.
  • the device can be brought to a standstill quickly by an operator.
  • the diaphragm spring 10 may in particular have a characteristic curve in which the force F first increases and subsequently falls from ⁇ .
  • the tool 1 itself a thread for solid ⁇ screws on the tool spindle 3 on.
  • erüb ⁇ is rigt the use of both of the fastening nut 14 and the support flange 13.
  • the tool may then, for example, to the intermediate element 11 as a supporting element in the sense of vorlie ⁇ constricting invention or to an intermediate member 11 corresponding element are applied.
  • the support ⁇ lement can also be formed in other ways.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Portable Power Tools In General (AREA)

Abstract

The invention relates to an electric hand-power tool device comprising a rotatable tool spindle for receiving a tool, said tool spindle having a supporting element for supporting the tool. The supporting element (13) is designed such that the tool (1) can be moved on a path L in an axial manner along the tool spindle (3) in the direction of the electric hand-power tool against a force (F) after said tool comes into contact with the supporting element (13) when the tool (1) is received on the tool spindle (3).

Description

Elektrohandwerkzeuggerät mit Werkzeugverlustsicherung  Electric hand tool with tool loss protection
Die Erfindung betrifft ein Elektrohandwerkzeug, insbesondere einen Winkelschleifer, bei welchem auf einer rotierbaren Werkzeugspindel ein Werkzeug angeordnet ist. Bei derartigen Elektrohandwerkzeugen wird üblicherweise das Werkzeug auf der Werkzeugspindel in der Weise befestigt, dass es sich beim Ar¬ beiten aufgrund des vom Werkstück auf das Werkzeug ausgeübte Gegendrehmoment zum Antriebsdrehmoment der Maschine selbsttä- tig festzieht. In jüngerer Zeit wurden jedoch Elektrohand- werkzeuge, insbesondere Winkelschleifer, mit sogenannten Spindelbremsen ausgestattet, die es dem Benutzer erlauben, das nachlaufende Werkzeug beispielsweise mittels einer Schei¬ benbremse abzubremsen, um das Elektrohandwerkzeug schneller beiseite legen zu können und zum nächsten Arbeitsschritt übergehen zu können. Die Verwendung von Spindelbremsen birgt jedoch eine gewisse Problematik dahingehend, dass sich beim Einsatz der Spindelbremse die Drehmomentverhältnisse zwischen dem Werkzeug und der Spindel bzw. einer Befestigungsmutter, mittels welcher das Werkzeug an der Spindel befestigt ist, gegenüber dem üblichen Betrieb des Werkzeugs umkehren. Mit anderen Worten übt beim Bremsen der Werkzeugspindel das Werkzeug selbst aufgrund seines Trägheitsmoments auf die Befesti¬ gungsmutter ein Drehmoment aus, welches die Befestigungsmut- ter lösen könnte. Hierdurch entsteht die Gefahr einer Lockerung oder im Extremfall des Abspringens des noch rotierenden Werkzeugs von der Werkzeugspindel, was schon allein aus Si¬ cherheitsgründen inakzeptabel ist. In der Vergangenheit wurden verschiedene Ansätze verfolgt, der oben beschriebenen Problematik zu begegnen. So wird bspw. in der internationalen Patentanmeldung WO 93/05927 AI eine Handwerkzeugmaschine vorgestellt, bei der sich ein Werkzeug, insbesondere eine Schleifscheibe, zwischen einem Innenflansch und einem Außenflansch befindet. Dabei ist auf der dem Werk- zeug abgewandten Seite des Innenflansches ein Keilkörper vorgesehen, der zwei Keilflächen aufweist, welche beim Abbremsen der Werkzeugspindel aneinander aufgleiten und so den Druck zwischen den beiden genannten Flanschen erhöhen, wodurch einem Lösen des Werkzeugs von der Werkzeugspindel entgegenge- wirkt werden soll. Nachteilig an der beschriebenen Lösung ist jedoch, dass praktisch jeglicher Bremsvorgang tendenziell die Spannung zwischen den Flanschen erhöht. Insbesondere hängt die Spannung zwischen den Flanschen nach dem beschriebenen Stand der Technik auch von der Art des Bremsvorgangs selbst ab, das heißt, je nachdem, ob der Bediener stärker oder schwächer bremst, wird die genannte Spannung zwischen den Flanschen höher oder geringer sein. Im Ergebnis führt die oben dargestellte Vorgehensweise dazu, dass zum gewollten Lö¬ sen des Werkzeugs, insbesondere für einen Werkzeugwechsel, praktisch in jedem einzelnen Fall ein unterschiedliches Drehmoment seitens des Bedieners aufgebracht werden muss; darüber hinaus kann sich in vielen Fällen die Spannung zwischen den beiden Flanschen aufgrund der vorhergegangenen Bremsvorgänge derart erhöht haben, dass ein einfaches Lösen des Werkzeugs durch den Bediener nicht mehr möglich ist, wodurch er zu Hilfsmitteln wie beispielsweise einer Rohrzange greifen muss, um das Werkzeug überhaupt noch wechseln zu können. The invention relates to an electric hand tool, in particular an angle grinder, in which a tool is arranged on a rotatable tool spindle. In such an electric hand tools, the tool is usually mounted on the tool spindle in such a way that it tightens when Ar ¬ BEITEN due to the force exerted by the workpiece on the tool counter-torque to the drive torque of the engine selbsttä- tig. However Elektrohand- were recently tool, in particular angle grinder, equipped with so-called spindle brakes that allow the user to brake the trailing tool, for example by means of a ticket ¬ plate brake to apply the electric hand tool faster aside and can proceed to the next step. However, the use of spindle brakes has a certain problem in that when using the spindle brake, the torque relationships between the tool and the spindle or a fastening nut, by means of which the tool is attached to the spindle, reverse the usual operation of the tool. In other words, the tool performs during braking of the tool spindle itself due to its inertia on the Fixed To ¬ supply nut torque of which could solve the fork fixing ter. This creates the risk of loosening or in the extreme case of Abspringens the still rotating tool of the tool spindle, which is unacceptable if only for Si ¬ cherheitsgründen. Various approaches have been taken in the past to address the problem described above. Thus, for example. in international patent application WO 93/05927 AI a hand tool presented, in which a tool, in particular a grinding wheel, is located between an inner flange and an outer flange. In this case, a wedge body is provided on the side facing away from the tool of the inner flange, which has two wedge surfaces which slide together when braking the tool spindle and thus increase the pressure between the two said flanges, thereby counteracting a loosening of the tool from the tool spindle shall be. A disadvantage of the described solution, however, is that virtually any braking tends to increase the tension between the flanges. In particular, the tension between the prior art flanges also depends on the nature of the braking process itself, that is, depending on whether the operator brakes more or less, said tension between the flanges will be higher or lower. As a result, the above procedure leads to the fact that for the desired Lö ¬ sen of the tool, in particular for a tool change, practically in each case a different torque must be applied by the operator; Moreover, in many cases, the tension between the two flanges may have increased due to the previous braking operations such that a simple release of the tool by the operator is no longer possible, whereby he must resort to tools such as a pipe wrench to the tool at all to be able to change.
Ausgehend von dem beschriebenen Stand der Technik stellt sich die vorliegende Erfindung die Aufgabe, eine einfache und ro¬ buste Sicherung gegen das selbsttätige Lösen eines Werkzeugs eines Elektrohandwerkzeuggeräts beim Bremsen zu schaffen, wo¬ bei dennoch ein einfacher Werkzeugwechsel durch einen Bedie- ner möglich bleibt. Diese Aufgabe wird gelöst durch die Vorrichtung mit den in Anspruch 1 aufgeführten Merkmalen. Die Unteransprüche betreffen vorteilhafte Aus führungs formen und Varianten der Erfindung . Das erfindungsgemäße Elektrohandwerkzeuggerät zeigt eine ro¬ tierbare Werkzeugspindel zur Aufnahme eines Werkzeugs, wobei die Werkzeugspindel ein Stützelement zum Abstützen des Werk¬ zeugs aufweist. Dabei ist das Stützelement in der Weise aus¬ gestaltet, dass das Werkzeug, nachdem es bei der Aufnahme des Werkzeugs auf die Werkzeugspindel in Berührungskontakt mit dem Stützelement kommt, auf einem Weg L gegen eine Kraft (F) entlang der Werkzeugspindel axial in Richtung des Elektro¬ handwerkzeuggeräts bewegt werden kann. Mit anderen Worten wird über das Stützelement auf das Werk¬ zeug beim Festschrauben des Werkzeuges und der damit verbundenen axialen Bewegung eine Gegenkraft ausgeübt, welcher der axialen Bewegung des Werkzeuges entgegengewirkt. Das Werkzeug kann bspw. mittels einer Befestigungsmutter auf der Werkzeugspindel fixierbar sein; ebenso ist es denkbar, dass das Werkzeug selbst ein Gewinde aufweist, das mit einem Gewinde auf der Werkzeugspindel zusammenwirkt. Derartige Werkzeuge, insbesondere Schleif- oder Schruppscheiben, sind auch unter dem Begriff "Hubbed Wheel" bekannt. Es wird also durch das Festschrauben des Werkzeuges auf der Werkzeugspindel eine definierte Kraft F in der Art einer Vor¬ spannung erzeugt, die den Reibschluss zwischen den beim Fi¬ xieren des Werkzeuges auf der Werkzeugspindel beteiligten Ge- winden verbessert. Based on the described prior art, the present invention has the object, a simple and ro ¬ buste security against the automatic release of a tool an electric hand tool device when braking to create, where ¬ yet a simple tool change by an operator remains possible. This object is achieved by the device having the features listed in claim 1. The dependent claims relate to advantageous embodiments and variants of the invention. The electric hand tool device according to the invention shows a ro ¬ tierable tool spindle for receiving a tool, wherein the tool spindle has a support member for supporting the work ¬ zeugs. In this case the support element is designed in the manner of ¬ that the tool after it arrives at the receiving of the tool on the tool spindle in touching contact with the support element, on a path L against a force (F) along the tool spindle axially in the direction of the electric ¬ hand tool device can be moved. In other words, a counterforce is exerted on the work ¬ tool when screwing the tool and the associated axial movement of the support element, which counteracts the axial movement of the tool. The tool can, for example, be fixable on the tool spindle by means of a fastening nut; It is also conceivable that the tool itself has a thread which cooperates with a thread on the tool spindle. Such tools, in particular grinding or grinding discs, are also known by the term "Hubbed Wheel". It is thus produced by the tightening of the tool on the tool spindle, a defined force F in the manner of a pre ¬ stress, which improves the frictional engagement between the threads involved in fi ¬ xieren the tool on the tool spindle.
Die beschriebenen Merkmale haben die Wirkung, dass das Werkzeug auf der Werkzeugspindel gegen ein unbeabsichtigtes Lö¬ sen, wie es insbesondere bei einem Abbremsen der rotierenden Werkzeugspindel mittels einer Spindelbremse geschehen kann, gesichert ist. Diese Sicherung beruht im Wesentlichen darauf, dass selbst bei einer geringfügigen Drehung der beteiligten Gewinde in Löserichtung die oben beschriebene Vorspannung zumindest teilweise erhalten bleibt und somit nach wie vor ein ausreichender Reibschluss zwischen den Gewinden vorhanden bleibt, um das Werkzeug noch auf der Werkzeugspindel zu hal¬ ten. Ohne die beschriebene Vorspannung würde der Reibschluss zwischen den Gewinden bereits bei einer geringen Rotation in Löserichtung stark vermindert werden, wodurch ein unbeabsich- tigtes vollständiges Lösen der beteiligten Gewinde und damit ein unbeabsichtigter Verlust des Werkzeugs begünstigt würde. The features described have the effect that the tool on the tool spindle against unintentional Lö ¬ sen, as it can happen especially when braking the rotating tool spindle by means of a spindle brake, is secured. This assurance is based essentially on the fact that even with a slight rotation of the threads involved in the release direction, the bias described above is at least partially maintained and thus still sufficient frictional engagement between the threads remains to hal still the tool on the tool spindle ¬ Without the pretensioning described, the frictional engagement between the threads would be greatly reduced even with a slight rotation in the release direction, which would facilitate inadvertent complete loosening of the threads involved and thus inadvertent loss of the tool.
Dadurch, dass die Vorspannung durch Komponenten erzeugt wird, die sich vollständig auf der dem Elektrohandwerkzeuggerät zu- gewandten Seite der Werkzeugspindel befinden, kann erreicht werden, dass die beschriebene Lösung weitgehend unabhängig von der Art der Befestigung des Werkzeugs auf der Werkzeugspindel ist. Insbesondere ist die erfindungsgemäße Lösung auch für Werkzeuge anwendbar, welche selbst ein Gewinde zur Fixierung auf einem korrespondierenden Gewinde auf der Werk- zeugspindel aufweisen, so dass sich ein vergleichsweise wei¬ tes Anwendungsfeld für die erfindungsgemäße Lösung ergibt. By virtue of the fact that the prestressing is produced by components which are located completely on the side of the tool spindle facing the electric hand tool device, it can be achieved that the described solution is largely independent of the way in which the tool is fastened to the tool spindle. In particular, the solution according to the invention is also applicable to tools which themselves have a thread for fixing on a corresponding thread on the workpiece. have a generating spindle, so that there is a comparatively wei ¬ tes field of application for the inventive solution.
Selbst in dem Fall, in dem ein Bediener das Werkzeug nur mit einem leichten Anzugsdrehmoment auf der Werkzeugspindel ver¬ schraubt, wird spätestens beim ersten Einschalten des Elekt- rohandwerkzeuggeräts das Werkzeug aufgrund seines Trägheits¬ momentes beim Anlaufen der Werkzeugspindel weiter festgezo¬ gen, so dass auch in diesem Fall die gewünschte Vorspannung erreicht wird. Even in the case where an operator, the tool screwed ¬ only with a slight torque on the tool spindle ver, is later than the first time the elec- the tool festgezo ¬ gen rohandwerkzeuggeräts due to its inertia ¬ torque at start-up of the tool spindle further so that also in this case the desired preload is achieved.
Ein weiterer Vorteil der erfindungsgemäßen Lösung besteht darin, dass die Werkzeugspindel aufgrund der erfindungsgemäßen Maßnahmen schnell abgebremst werden kann, so dass der Bedie- ner das mit der erfindungsgemäßen Lösung ausgestattete Elekt- rohandwerkzeuggerät nach dem Abschalten schnell beiseitelegen und sich weiteren Aufgaben zuwenden kann. Daneben bedarf es bei der Realisation der erfindungsgemäßen Lösung keinerlei Einweisung der Bediener, da sich der Prozess der Montage ei- nes Werkzeugs auf einem mit der erfindungsgemäßen Lösung ausgestatteten Elektrohandwerkzeuggerät durch nichts von dem Vorgehen bei konventionellen Elektrohandwerkzeuggeräten unterscheidet . Auch das Lösen des Werkzeugs geschieht gegenüber dem Stand der Technik auf unveränderte Weise, insbesondere ist zum Lö¬ sen des erfindungsgemäß gesicherten Werkzeugs kein erhöhter Kraftaufwand erforderlich; auch muss kein gesonderter Lösemechanismus seitens des Bedieners betätigt werden. Daneben zeichnet sich die erfindungsgemäße Lösung dadurch aus, dass sie mittels einer relativ einfachen, robusten Konstruktion realisiert werden kann . So kann das Stützelement selbst in einer einfachen Ausführungsform der Erfindung als ein elastisch in axialer Richtung deformierbares Element, bspw. aus einem Hartgummi ausgebildet sein . Ferner kann das Stützelement als ein in axialer Richtung entgegen der Kraft F bewegbares Element ausgebildet sein. A further advantage of the solution according to the invention is that the tool spindle can be braked rapidly due to the inventive measures, so that the operator can quickly set aside the handheld power tool equipped with the solution according to the invention after switching off and can turn to other tasks. In addition, the implementation of the solution according to the invention requires no instruction from the operators, since the process of mounting a tool on an electric hand tool device equipped with the solution according to the invention differs nothing from the procedure with conventional electric hand tool devices. Also, the release of the tool is done over the prior art in an unchanged manner, in particular for Lö ¬ sen of the present invention secured tool no increased force required; Also, no separate release mechanism must be operated by the operator. In addition, the solution according to the invention is characterized in that it can be realized by means of a relatively simple, robust construction. Thus, even in a simple embodiment of the invention, the support element can be designed as a resiliently deformable element in the axial direction, for example, from a hard rubber. Further, the support member may be formed as a movable in the axial direction against the force F element.
Dabei kann sich das Stützelement seinerseits auf einem axial bewegbaren Zwischenelement abstützen und das Zwischenelement kann auf einem Federelement gelagert sein, welches sich sei¬ nerseits auf einem in axialer Richtung festen Flansch auf der Werkzeugspindel abstützt. In this case, the support element in turn can be supported on an axially movable intermediate element and the intermediate element can be mounted on a spring element, which is ¬ nerseits supported on a fixed flange in the axial direction on the tool spindle.
Sowohl das Zwischenelement als auch das Federelement können dabei drehfest, aber axial beweglich auf der Werkzeugspindel angeordnet sein. Die beschriebene Variante ermöglicht eben¬ falls eine konstruktiv vergleichsweise einfache Realisierung der Erfindung. Dabei kann durch die Wahl des Federelements ein gewünschter Kraftverlauf entlang des Weges L eingestellt werden. Bei dem Federelement kann es sich um eine Tellerfe¬ der, einen Federring oder auch um ein alternatives elastisches Element handeln. Both the intermediate element and the spring element can be arranged rotationally fixed, but axially movable on the tool spindle. The variant described also allows ¬ if a structurally comparatively simple implementation of the invention. In this case, a desired force curve along the path L can be adjusted by the choice of the spring element. The spring element may be a Tellerfe ¬ of a spring ring or an alternative resilient element.
Dadurch, dass ein Anschlag zur Begrenzung der axialen Bewe- gung des Werkzeugs in Richtung des Elektrohandwerkzeuggerätes vorhanden ist, kann eine definierte Vorspannung eingestellt werden. Ferner wird durch den Anschlag erreicht, dass ein Be- diener beim Fixieren des Werkzeuges auf der Werkzeugspindel eine taktile Rückmeldung dahingehend erhält, dass das Werk¬ zeug hinreichend fest fixiert ist. Because a stop for limiting the axial movement of the tool in the direction of the electric hand tool device is present, a defined preload can be set become. Furthermore, it is achieved by the stop that an operator when fixing the tool on the tool spindle receives a tactile feedback to the effect that the tool is ¬ fixed sufficiently firmly.
Die Kraft F kann unabhängig von der entlang des Gesamtweges L zurückgelegten Strecke, insbesondere konstant, gewählt sein. The force F can be selected independently of the distance traveled along the entire path L, in particular constant.
Daneben ist es denkbar, dass die Kraft F beim Fixieren des Werkzeugs während der Axialbewegung in Richtung des Elektro- handwerkzeuggeräts zunächst ansteigt und sich nachfolgend verringert . In addition, it is conceivable that the force F during the fixing of the tool during the axial movement in the direction of the electric hand tool device first increases and subsequently decreases.
Ein derartiger Kraftverlauf kann insbesondere durch die Ver¬ wendung einer Tellerfeder erreicht werden. Der beschriebene Kraftverlauf bewirkt, dass sich der Reibschluss zwischen den beteiligten Gewinden beim Abbremsen des Werkzeuges bei einer leichten Drehung der Gewinde in Löserichtung zunächst erhöht und damit die gewünschte Sicherungswirkung eintritt. Such a force curve can be achieved in particular by the Ver ¬ use of a plate spring. The force curve described causes the frictional engagement between the threads involved when braking the tool at a slight rotation of the thread initially increased in the release direction and thus enters the desired securing effect.
Alternativ kann die Kraft F entlang des Weges L auch monoton ansteigen . Alternatively, the force F can also increase monotonically along the path L.
Nachfolgend wird ein exemplarisches Ausführungsbeispiel der Erfindung anhand der einzigen Figur erläutert. Hereinafter, an exemplary embodiment of the invention will be explained with reference to the single figure.
Die Figur zeigt in einer Schnittdarstellung grob schematisch denjenigen Bereich eines Elektrohandwerkzeuggeräts , im vor¬ liegenden Fall eines Winkelschleifers, welcher das Werkzeug, hier eine Schleifscheibe 1, trägt. Zur Aufnahme der Schleif¬ scheibe 1 ist in einem Getriebegehäuse 2 eine Werkzeugspindel 3 drehbar gelagert. Die Lagerung erfolgt im gezeigten Bei¬ spiel mittels eines Wälzlagers 4 und eines Kugellagers 5. Ebenfalls dargestellt in der Figur ist das drehfest mit der Werkzeugspindel 3 verbundene Tellerrad 6, welches in Ein- griff mit einem Ritzel 7 einer Antriebswelle 8 steht. The figure shows in a sectional view schematically roughly that portion of an electric hand tool device, in ahead ¬ case of an angle grinder, which the tool, in this case carries a grinding wheel 1,. To accommodate the grinding ¬ disc 1 is a tool spindle in a transmission housing 2 3 rotatably mounted. The bearing takes place in the case shown ¬ game by means of a rolling bearing 4 and a ball bearing 5. Also shown in the figure is rotatably connected to the tool spindle 3 ring gear 6, which is in engagement with a pinion 7 of a drive shaft 8.
An das Kugellager 5 schließt sich auf der Werkzeugspindel 3 der drehfest mit der Werkzeugspindel 3 verbundene Flansch 9 an, der im gezeigten Beispiel mit der Werkzeugspindel 3 ver- schraubt ist. The ball bearing 5 is adjoined on the tool spindle 3 by the flange 9 which is connected in a rotationally fixed manner to the tool spindle 3 and which, in the example shown, is screwed to the tool spindle 3.
Auf der der Schleifscheibe 1 zugewandten Seite des FlanschesOn the grinding wheel 1 facing side of the flange
9 ist eine Tellerfeder 10 als Federelement gelagert, auf wel¬ cher ein Zweikant 11 als Zwischenelement angeordnet ist. Der Zweikant 11 ist dabei entgegen der Federkraft der Tellerfeder9, a plate spring 10 is mounted as a spring element, on wel ¬ cher a two-edge 11 is arranged as an intermediate element. The two-edge 11 is against the spring force of the plate spring
10 in axialer Richtung, also insbesondere auch in Richtung des Elektrohandwerkzeuggeräts, beweglich. Die axiale Bewegung des Zweikants 11 wird geräteseitig durch den Anschlag 12 be¬ grenzt. Der Zweikant 11 trägt ferner das auf der Werk- zeugspindel 3 in Richtung der Schleifscheibe angeordnete Stützelement, das im vorliegenden Beispiel als Stützflansch 13 ausgebildet ist. Die Schleifscheibe 1 ist im gezeigten Beispiel mittels der Befestigungsmutter 14 auf der Werkzeugspindel 3 fixiert. 10 in the axial direction, ie in particular in the direction of the electric hand tool, movable. The axial movement of the two-edge 11 is on the device side by the stop 12 be ¬ limits. The two-edge 11 also carries the support element arranged on the tool spindle 3 in the direction of the grinding wheel, which in the present example is designed as a support flange 13. The grinding wheel 1 is fixed in the example shown by means of the fastening nut 14 on the tool spindle 3.
Ferner ist die Schleifscheibe 1 zumindest teilweise von der Schutzhaube 15 umgeben. Furthermore, the grinding wheel 1 is at least partially surrounded by the protective hood 15.
Mittels einer Spindelbremse 16 mit einer auf der Antriebswel- le 8 angeordneten Bremsscheibe 162 und auf diese einwirkende Bremsklötze 161 kann die Schleifscheibe 1 nach einem Abschal- ten des Geräts durch einen Bediener schnell zum Stillstand gebracht werden. By means of a spindle brake 16 with a brake disk 162 arranged on the drive shaft 8 and brake pads 161 acting thereon, the grinding wheel 1 can be turned off after a shut-off. The device can be brought to a standstill quickly by an operator.
Beim Festziehen der Befestigungsmutter 14 durch einen Bedie- ner wirkt auf die Schleifscheibe 1 eine Kraft in axialer Richtung, insbesondere in Richtung des Elektrohandwerkzeugge- räts, welche sich auf den axial beweglichen Stützflansch 13 und den Zweikant 11 überträgt. Somit wird die gesamte Anord¬ nung bestehend aus Befestigungsmutter 14, Schleifscheibe 1, Stützflansch 13 und Zweikant 11 entgegen der von der Tellerfeder 10 ausgeübten Kraft F bis zum Anschlag 12 bewegt. Auf diese Weise wird bei der Montage der Schleifscheibe 1 eine Vorspannung auf die Befestigungsmutter 14 erzeugt. Die Tellerfeder 10 kann dabei insbesondere eine Kennlinie aufweisen, bei welcher die Kraft F zunächst ansteigt und nachfolgend ab¬ fällt. Auf diese Weise kann erreicht werden, dass sich der Reibschluss zwischen der Befestigungsmutter 14 und der Werkzeugspindel 3 bei einem ersten Lösen der Befestigungsmutter 14 bspw. bei einem Bremsvorgang zunächst erhöht, so dass ei- nem weiteren Lösen der Befestigungsmutter 14 entgegen gewirkt wird . When the fastening nut 14 is tightened by a user, a force acts in the axial direction on the grinding wheel 1, in particular in the direction of the electric hand tool device, which transmits to the axially movable supporting flange 13 and the two edge 11. Thus, the entire Anord ¬ tion consisting of fastening nut 14, grinding wheel 1, support flange 13 and two edge 11 against the force exerted by the plate spring 10 force F is moved to the stop 12. In this way, a bias is generated on the mounting nut 14 during assembly of the grinding wheel 1. The diaphragm spring 10 may in particular have a characteristic curve in which the force F first increases and subsequently falls from ¬ . In this way it can be achieved that the frictional engagement between the fastening nut 14 and the tool spindle 3 initially increases during a first release of the fastening nut 14 during a braking operation, for example, so that further loosening of the fastening nut 14 is counteracted.
Dadurch, dass der Anschlag 12 vorhanden ist, wird gewährleis¬ tet, dass der Bediener beim Fixieren der Schleifscheibe 1 auf der Werkzeugspindel 3 eine definierte taktile Rückmeldung darüber erhält, ab welchem Punkt die Schleifscheibe 1 hinrei¬ chend auf der Werkzeugspindel 3 fixiert ist. Selbst in denje¬ nigen Fällen, in welchen der Bediener es versäumt, die Befestigungsmutter 14 bis zum Erreichen des Anschlags 12 festzu- ziehen, wird das Elektrohandwerkzeuggerät beim ersten Ein¬ schalten aufgrund des Trägheitsmoments der Schleifscheibe 1 die Befestigungsmutter 14 automatisch bis zum Erreichen des Anschlags 12 festziehen und damit die Schleifscheibe 1 prak¬ tisch verliersicher auf der Werkzeugspindel 3 fixieren. In einer in der Figur nicht gezeigten Aus führungs form der Erfindung weist das Werkzeug 1 selbst ein Gewinde zum Fest¬ schrauben auf der Werkzeugspindel 3 auf. In diesem Fall erüb¬ rigt sich die Verwendung sowohl der Befestigungsmutter 14 als auch des Stützflansches 13. Das Werkzeug kann dann bspw. an das Zwischenelement 11 als Stützelement im Sinne der vorlie¬ genden Erfindung oder an ein dem Zwischenelement 11 entsprechendes Element angelegt werden; alternativ kann das Stütze¬ lement auch auf andere Weise ausgebildet sein. Characterized in that the stop 12 is present is legal slightest ¬ tet that the operator in securing the wheel 1 on the tool spindle 3 is a defined tactile feedback as to the point at which the grinding wheel 1 is rea ¬ accordingly fixed on the tool spindle. 3 Even in denje ¬ Nigen instances where the operator fails to festzu- tighten the fixing nut 14 until it reaches the stop 12, the electrical hand tool device in the first ¬ A is switched due to the inertia of the grinding wheel 1 automatically tighten the fixing nut 14 until it reaches the stop 12 and thus fix the grinding wheel 1 prak ¬ table captive on the tool spindle. 3 In an embodiment of the invention, not shown in the figure, the tool 1 itself a thread for solid ¬ screws on the tool spindle 3 on. In this case erüb ¬ is rigt the use of both of the fastening nut 14 and the support flange 13. The tool may then, for example, to the intermediate element 11 as a supporting element in the sense of vorlie ¬ constricting invention or to an intermediate member 11 corresponding element are applied. alternatively, the support ¬ lement can also be formed in other ways.

Claims

Patentansprüche claims
1. Elektrohandwerkzeuggerät mit einer rotierbaren Werk¬ zeugspindel zur Aufnahme eines Werkzeugs, wobei die Werk- zeugspindel ein Stützelement zum Abstützen des Werkzeugs aufweist, 1. Electric hand tool device with a rotatable tool spindle ¬ tool for receiving a tool, wherein the tool spindle has a support member for supporting the tool,
dadurch gekennzeichnet, dass das Stützelement (11) in der Weise ausgestaltet ist, dass das Werkzeug (1), nachdem es bei der Aufnahme des Werkzeugs (1) auf die Werkzeugspin- del (3) in Berührungskontakt mit dem Stützflansch (13) kommt, auf einem Weg L gegen eine Kraft (F) entlang der Werkzeugspindel (3) axial in Richtung des Elektrohand- werkzeuggeräts bewegt werden kann.  characterized in that the support element (11) is designed in such a way that the tool (1), after it comes into contact with the support flange (13) when the tool (1) is received on the tool spindle (3), on a path L against a force (F) along the tool spindle (3) can be moved axially in the direction of the electric hand tool device.
2. Elektrohandwerkzeuggerät nach Anspruch 1, 2. Electric hand tool device according to claim 1,
dadurch gekennzeichnet, dass das Werkzeug (1) mittels ei¬ ner Befestigungsmutter (14) auf der Werkzeugspindel (3) fixierbar ist. characterized in that the tool (1) by means of ei ¬ ner fastening nut (14) on the tool spindle (3) is fixable.
3. Elektrohandwerkzeuggerät nach Anspruch 1, 3. Electric hand tool device according to claim 1,
dadurch gekennzeichnet, dass das Werkzeug (1) selbst ein Gewinde aufweist, das mit einem Gewinde auf der Werk¬ zeugspindel zusammenwirkt. characterized in that the tool (1) itself has a thread which cooperates with a thread on the work ¬ tool spindle.
4. Elektrohandwerkzeuggerät nach einem der Ansprüche 1 bis 3, 4. Electric hand tool device according to one of claims 1 to 3,
dadurch gekennzeichnet, dass das Stützelement (11) als elastisch in axialer Richtung deformierbares Element ausgebildet ist. characterized in that the support element (11) is designed as elastically deformable in the axial direction element.
5. Elektrohandwerkzeuggerät nach einem der Ansprüche 1 bis 4, 5. Electric hand tool device according to one of claims 1 to 4,
dadurch gekennzeichnet, dass das Stützelement (11, 13) als ein in axialer Richtung entgegen die Kraft (F) bewegbares Element ausgebildet ist.  characterized in that the supporting element (11, 13) is designed as a movable in the axial direction against the force (F) element.
6. Elektrohandwerkzeuggerät nach Anspruch 5, 6. Electric hand tool device according to claim 5,
dadurch gekennzeichnet, dass sich der Stützflansch (13) seinerseits auf einem axial bewegbaren Stützelement (11) abstützt und das Stützelement (11) auf einem Federelement (10) gelagert ist, welches sich seinerseits auf einem in axialer Richtung festen Flansch (9) auf der Werkzeugspindel (3) abstützt.  characterized in that the support flange (13) in turn on an axially movable support member (11) is supported and the support member (11) on a spring element (10) is mounted, which in turn on a fixed flange in the axial direction (9) on the Tool spindle (3) supported.
7. Elektrohandwerkzeuggerät nach einem der Ansprüche 1 bis 6, 7. Electric hand tool device according to one of claims 1 to 6,
dadurch gekennzeichnet, dass ein Anschlag (12) zur Be¬ grenzung der axialen Bewegung des Werkzeugs (1) vorhanden ist . characterized in that a stop (12) for limiting Be ¬ the axial movement of the tool (1) is present.
8. Elektrohandwerkzeuggerät nach einem der Ansprüche 1 bis 7, 8. Electric hand tool device according to one of claims 1 to 7,
dadurch gekennzeichnet, dass die Kraft (F) unabhängig von der entlang des Gesamtweges L zurückgelegten Strecke gewählt ist.  characterized in that the force (F) is selected independently of the traveled along the entire path L route.
9. Elektrohandwerkzeuggerät nach einem der Ansprüche 1 bis 7, 9. Electric hand tool device according to one of claims 1 to 7,
dadurch gekennzeichnet, dass die Kraft (F) beim Fixieren des Werkzeugs (1) während der Axialbewegung in Richtung des Elektrohandwerkzeuggeräts zunächst ansteigt und sich nachfolgend verringert. characterized in that the force (F) during the fixing of the tool (1) during the axial movement in the direction of the electric power tool first increases and subsequently decreases.
10. Elektrohandwerkzeuggerät nach einem der Ansprüche 1 bis 7, 10. Electric hand tool device according to one of claims 1 to 7,
dadurch gekennzeichnet, dass die Kraft (F) entlang des Weges L monoton ansteigt.  characterized in that the force (F) increases monotonically along the path L.
Elektrohandwerkzeuggerät nach einem der Ansprüche 1 bis 10, Electric hand tool according to one of claims 1 to 10,
dadurch gekennzeichnet, dass es sich bei dem Elektrohand¬ werkzeuggerät um einen Winkelschleifer mit einer Spindelbremse (16) handelt. 12. Elektrohandwerkzeuggerät nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die axiale Bewegung des Werkzeuges (1) bei einem Einschalten des Elektrohandwerkzeuggeräts selbsttätig erfolgen kann. characterized in that it is in the electric hand tool apparatus ¬ at an angle grinder having a spindle brake (16). 12. Electric hand tool according to one of claims 1 to 11, characterized in that the axial movement of the tool (1) can be carried out automatically when switching on the electric hand tool.
EP12710267.1A 2011-03-23 2012-03-22 Electric hand-power tool device with tool securing means Active EP2651600B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011005952A DE102011005952A1 (en) 2011-03-23 2011-03-23 Electric hand tool with tool loss protection
PCT/EP2012/055110 WO2012126997A1 (en) 2011-03-23 2012-03-22 Electric hand-power tool device with tool securing means

Publications (2)

Publication Number Publication Date
EP2651600A1 true EP2651600A1 (en) 2013-10-23
EP2651600B1 EP2651600B1 (en) 2017-05-10

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US (1) US9399278B2 (en)
EP (1) EP2651600B1 (en)
DE (1) DE102011005952A1 (en)
WO (1) WO2012126997A1 (en)

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DE102013200867A1 (en) * 2013-01-21 2014-07-24 Robert Bosch Gmbh Machine tool braking device
US10076832B2 (en) * 2016-07-27 2018-09-18 Robert Bosch Tool Corporation Accessory system for a power tool
EP3960384B1 (en) 2020-08-28 2024-06-05 Black & Decker Inc. Airflow intake configuration in power tool

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Publication number Publication date
EP2651600B1 (en) 2017-05-10
US20140080387A1 (en) 2014-03-20
WO2012126997A1 (en) 2012-09-27
US9399278B2 (en) 2016-07-26
DE102011005952A1 (en) 2012-09-27

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