EP1790434B1 - Motor driven hand tool with a rapid clamping device - Google Patents

Motor driven hand tool with a rapid clamping device Download PDF

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Publication number
EP1790434B1
EP1790434B1 EP05025876A EP05025876A EP1790434B1 EP 1790434 B1 EP1790434 B1 EP 1790434B1 EP 05025876 A EP05025876 A EP 05025876A EP 05025876 A EP05025876 A EP 05025876A EP 1790434 B1 EP1790434 B1 EP 1790434B1
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EP
European Patent Office
Prior art keywords
hollow shaft
power tool
clamping
tool according
bolt
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EP05025876A
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German (de)
French (fr)
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EP1790434A1 (en
Inventor
Martin Baumann
Jürgen Bilckle
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Metabowerke GmbH and Co
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Metabowerke GmbH and Co
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Application filed by Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Priority to EP05025876A priority Critical patent/EP1790434B1/en
Priority to AT05025876T priority patent/ATE389510T1/en
Priority to DE502005003376T priority patent/DE502005003376D1/en
Publication of EP1790434A1 publication Critical patent/EP1790434A1/en
Application granted granted Critical
Publication of EP1790434B1 publication Critical patent/EP1790434B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • 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
    • B24B23/022—Spindle-locking devices, e.g. for mounting or removing the tool
    • 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

Definitions

  • the invention relates to a motor-driven tool device, in particular a hand tool with a planar tool, such as a cutting disc, roughing wheel, grinding wheel, and a quick-clamping device for the planar tool, comprising a clamping lever, by the operation of the quick-clamping device of a clamping tool firmly clamped in a tool a loosening of the tool permitting release position can be transferred and vice versa, a hollow shaft with a therein insertable in the longitudinal direction of the hollow shaft bolt, wherein the hollow shaft and the bolt clamp clamping carry between which the tool is clamped.
  • a motor-driven tool device in particular a hand tool with a planar tool, such as a cutting disc, roughing wheel, grinding wheel, and a quick-clamping device for the planar tool, comprising a clamping lever, by the operation of the quick-clamping device of a clamping tool firmly clamped in a tool a loosening of the tool permitting release position can be transferred and vice versa, a hollow shaft
  • Such an electric hand tool device is, for example, in DE 100 39 739 A1 described.
  • the clamping force is applied by a provided inside the hollow shaft compression spring, which is supported between an inner collar of the hollow shaft and a piston means in the interior of the hollow shaft.
  • the piston means has a threaded bore extending in the longitudinal direction of the sleeve into which the previously mentioned bolt can be screwed.
  • About said clamping lever and a cam mentioned piston means can be pressed against the spring force together with the bolt screwed therein down, so that the clamping flange is released on the bolt of the clamping flange on the hollow shaft.
  • the quick-clamping device is complicated due to the large number of components within the hollow shaft and it is not easy to use, since for tightening and loosening a tool always the bolt must be screwed or unscrewed.
  • rollers inside a hollow shaft use that occur when pressing an actuator in escape areas, causing wedges lose their locking effect and a clamping flange is displaced in the axial direction, which then allows the release of a tool clamping clamping nut on the clamping flange.
  • the device is constructed overall extremely complicated and cumbersome to use in view of the réelleschraubende here component.
  • the present invention is based on the object to improve a tool device of the type mentioned in terms of a simple, yet safe construction of a quick-release device.
  • the hollow shaft has at least one window-like opening in which a clamping body is arranged, and that the clamping body against the inside and against the pin against a spring-loaded inclined surface can be applied, so that the bolt on the clamping body in consequence of Spring load of the inclined surface is clamped in the hollow shaft and thereby held in the hollow shaft.
  • clamping bodies are therefore used directly for transmitting a clamping force or clamping force to the bolt.
  • the bolt transmits this clamping force via its clamping flange on the tool.
  • By the clamp body of the bolt is forced in the axial direction.
  • a particular advantage of the embodiment of the quick-release device according to the invention is the fact that it adjusts itself almost automatically to different thicknesses of the tool, that is to say in particular different sawing, grinding, cutting or roughing wheel thicknesses.
  • the tool is positioned on the clamping flange of the hollow shaft and then simply needs the bolt to be inserted into the hollow shaft until its clamping flange rests snugly on the surface of the tool.
  • the mentioned spring-loaded inclined surface forces the clamping body against the bolt and generates and transmits in this way a clamping force on the bolt.
  • the inclined surface is oriented and spring-loaded in such a way that a force directed in the insertion direction of the bolt is transmitted to the clamping body or the bolt via the clamping body. It is understood that preferably two such window-like receptacles and clamping body and spring-loaded inclined surfaces are provided.
  • the clamping body are formed by cylindrical roller bodies and the bolt in the area concerned a flattened, preferably flat surface having.
  • window-like opening is advantageously formed elongated hole-shaped or elongated in the longitudinal direction of the hollow shaft, so a corresponding travel can be realized.
  • the window-like opening can be made by milling transverse to the longitudinal direction of the hollow shaft in a simple manner.
  • the mentioned inclined surface could be formed per se of any construction elements, in particular of longitudinally or transversely displaceable wedge-shaped bodies. It turns out in development of the invention, however, to be particularly advantageous if the Inclined surface of a hollow shaft surrounding in the circumferential direction body, in particular is formed with a cylindrical basic geometry. This body then preferably has a longitudinally extending cylindrical bore, which corresponds substantially to the outer diameter of the hollow shaft, so that the body can be slid over the hollow shaft on this.
  • the aforementioned inclined surface in the body can be advantageously formed by a free-milling dipping into the body transversely to the longitudinal direction of the hollow shaft.
  • the at least one clamping body is a cylindrical roller and if the bolt in the region of the window-like opening has a flattened surface which interacts with the clamping body.
  • the bolt has a complementary shape to the shape of the clamping body formed surface shape, over a longitudinal extent which is greater than the window-like opening in the hollow shaft. In this way, it is possible that the quick-clamping device can automatically adjust to different thicknesses of the tool.
  • the clamping body has a diameter which is 0.5 to 8 times the wall thickness of the hollow shaft in this area.
  • a particularly good clamping effect is achieved when the inclined surface has a tendency to the longitudinal direction of the hollow shaft of 1 to 15 °.
  • the tensioning lever is in a preferred embodiment of the power tool according to the invention an eccentric lever which is pivotable about a fixed axis relative to the housing and rolls against a cam which indirectly or directly displaces the spring-loaded inclined surface against its spring bias.
  • the clamping body is brought out of clamping position, and the bolt can be pulled out of the hollow shaft.
  • the bolt need not be screwed or unscrewed; no screwing in or unscrewing movements has to be carried out.
  • the bolt is only inserted into the hollow shaft until it fits snugly against the surface of the tool, the tool thickness is automatically accommodated. Accordingly, the bolt for disassembly of the tool needs to be pulled out of the hollow shaft again in the axial direction after loosening the clamping body.
  • the spring preload of the inclined surface can take place in any desired manner in that one spring is supported at one end relative to an abutment provided on the hollow shaft and at the other end the oblique surface or a body forming the inclined surface is loaded. It proves to be advantageous if the inclined surface is loaded by a plate spring package, which surrounds the hollow shaft in particular concentric and is supported at one end against the hollow shaft. The disc spring assembly can then be supported in a structurally simple manner against a collar on the outside of the hollow shaft or against radially projecting projections on the hollow shaft.
  • the quick-clamping device is designed so that it can adapt tool thicknesses of 1 to 12 mm without changing other components.
  • FIG. 1 shows a generally designated by the reference numeral 2 quick-clamping device in a tool device, in particular hand tool, with a planar tool 4, for example in the form of a cutting disc, grinding wheel or grinding wheel or a saw blade.
  • the tool device is indicated only by a housing 6.
  • the quick-clamping device 2 comprises a clamping lever 8, which is a housing-fixed axis 10 between a in FIG. 1 assumed clamping position and a release position shown by the arrow 12 is pivotable.
  • the quick-clamping device 2 comprises a hollow shaft 14 with a clamping flange 16 and a bolt 18 with a clamping flange 20-
  • the bolt 18 can be inserted in the longitudinal direction 22 of the hollow shaft 14 in this.
  • the hollow shaft in the illustrated exemplary case, two window-like openings 28 which are introduced transversely to the longitudinal direction 22 in the hollow shaft 14.
  • a roller-shaped or roller-shaped clamping body 30 is arranged in each case, whose roller diameter is greater than the wall thickness of the hollow shaft 14.
  • the respective clamping body 30 is therefore in the interior 32 of the hollow shaft 14 and outwardly of the hollow shaft fourteenth in front.
  • the respective clamping body cooperates on the outside with a respective inclined surface 34, which is inclined to the longitudinal direction 22 of the hollow shaft 14.
  • the oblique surface 34 is formed by a body 36 having a substantially circular-cylindrical basic geometry, as illustrated by way of example. It surrounds the hollow shaft 14 concentrically in the circumferential direction and for this purpose has a circular cylindrical opening extending in the longitudinal direction 22, with which it is pushed onto the hollow shaft 14. He also has a transverse to the longitudinal direction 22 of the hollow shaft 14 introduced from one side free-milling 38, the best of FIG. 2 it can be seen, wherein the said inclined surfaces 34 are formed by this free-cutting in the interior of the body 36.
  • the body 36 is pretensioned via a disk spring package 40 in the direction of the tensioning lever 8, that is to say away from the clamping flanges 16, 20.
  • the plate spring package 40 is supported against a merely schematically indicated abutment 42 on the outer circumference of the hollow shaft 14 from.
  • the clamping body 30 - with inserted pin 18 - pressed against the outer surface of the bolt 18 and pull the bolt 18 while in the direction of arrow 44, so that its clamping flange 20 against the clamping flange 16 the hollow shaft 14 is forced. In this way, the tool 4 between the clamping flanges 16, 20 holding clamping force is generated and maintained.
  • a directly or indirectly acted upon by the clamping lever 8 actuator 46 in the example shown in the form of a cup-shaped geometry formed body provided, which is designed to be displaceable in the longitudinal direction 22 and in the direction of the clamping lever 8 by a per se any spring means 48 is biased. If the clamping lever 8, starting from the in FIG. 1 pivoted position shown in the direction of arrow 12 in the release position, so presses the eccentric clamping lever 46 in the longitudinal direction 22 against the arrow 44 down until the actuator starts after a certain travel against the body 36 and this also against the action of the plate spring package 40th moved down. As a result, but reach the clamping body 30 except clamping position and the bolt 18 can be performed without a screwing movement, are pulled down from the hollow shaft 14.
  • the tool 4 can then be replaced with a new one.
  • the bolt 18 is again inserted into the hollow shaft 14, and for clamping the newly inserted tool, the clamping lever 8 is again in the in FIG. 1 moved back position shown.
  • the body 36 is moved in the direction of Adjusted arrow 44, whereby the clamping body 30 are forced back into clamping position.
  • the actuator 46 is finally lifted under the action of the spring means 48 of the located in its Klemmend ein body 36 and in the in FIG. 1 moved back home position shown.
  • the spring means 48 could of course also be provided a different positive coupling between clamping lever and actuator. It would also be conceivable that the tensioning lever acts directly on the adjusting element 46 via suitable eccentric areas.
  • the tool device is then further designed so that the described components consisting of hollow shaft 14, body 36 with inclined surfaces 34, including plate spring package 40 and pin 18 are driven in rotation or oscillating.
  • a drive gear is seated, which in the schematic representation of FIG. 1 but not shown. Only indicated is a radial bearing 50.
  • FIG. 2 again schematically shows a perspective view of hollow shaft 14 with inserted pin 18 and body 36 with inclined surfaces 34 and clamping bodies 30. Further indicated is the plate spring package 40. It can be seen the window-like openings 28 which are introduced by free grooves from radially outside into the hollow shaft 14.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Clamps And Clips (AREA)

Abstract

The device has a quick clamping device (2), a hollow shaft (14) with a bolt (18) extending in the longitudinal direction of the shaft and a window-like opening (28), in which a clamp body (30) is arranged. A tool is clamped between clamping surfaces. The clamp body is attached against the bolt and against a spring-loaded inclined plane (34) so that the bolt is clamped by the clamp body as a result of the spring loading of the inclined plane and is held in the hollow shaft.

Description

Die Erfindung betrifft ein motorisch antreibbares Werkzeuggerät, insbesondere ein Handwerkzeuggerät mit einem flächenhaften Werkzeug, wie eine Trennscheibe, Schruppscheibe, Schleifscheibe, und einer Schnellspanneinrichtung für das flächenhafte Werkzeug, umfassend einen Spannhebel, durch dessen Betätigung die Schnellspanneinrichtung von einer das Werkzeug fest einspannenden Spannstellung in eine ein Lösen des werkzeugs erlaubende Freigabestellung überführbar ist und umgekehrt, eine Hohlwelle mit einem darin in Längsrichtung der Hohlwelle einsteckbaren Bolzen, wobei die Hohlwelle und der Bolzen Klemmflansche tragen zwischen denen das Werkzeug klemmbar ist.The invention relates to a motor-driven tool device, in particular a hand tool with a planar tool, such as a cutting disc, roughing wheel, grinding wheel, and a quick-clamping device for the planar tool, comprising a clamping lever, by the operation of the quick-clamping device of a clamping tool firmly clamped in a tool a loosening of the tool permitting release position can be transferred and vice versa, a hollow shaft with a therein insertable in the longitudinal direction of the hollow shaft bolt, wherein the hollow shaft and the bolt clamp clamping carry between which the tool is clamped.

Ein derartiges Elektrohandwerkzeuggerät ist beispielsweise in DE 100 39 739 A1 beschrieben. Bei der Schnellspanneinrichtung dieses bekannten Handwerkzeuggeräts wird die Klemmkraft durch eine im Inneren der Hohlwelle vorgesehene Druckfeder aufgebracht, die sich zwischen einem inneren Bund der Hohlwelle und einem Kolbenmittel im Inneren der Hohlwelle abstützt. Das Kolbenmittel verfügt über eine in Längsrichtung der Hülse verlaufende Gewindebohrung, in die der vorausgehend genannte Bolzen einschraubbar ist. Über den erwähnten Spannhebel und einen Nocken kann das erwähnte Kolbenmittel entgegen der Federkraft zusammen mit dem darin eingeschraubten Bolzen nach unten gedrückt werden, so dass der Klemmflansch am Bolzen von dem Klemmflansch an der Hohlwelle freikommt. Auf diese weise wird eine Klemmkraft überwunden und der Bolzen lässt sich samt Klemmflansch aus dem Kolbenmittel ausschrauben und aus der Hohlwelle abziehen, so dass eine neue Schleif- oder Trennscheibe eingesetzt werden kann. Danach wird der Bolzen wieder in die Hohlwelle gesteckt und nur leicht in das Kolbenmittel eingeschraubt. Wenn der Spannhebel in Spannrichtung bewegt wird, so wird durch die erwähnte Feder die Klemmkraft zum Halten des Werkzeugs zwischen den Klemmflanschen aufgebracht.Such an electric hand tool device is, for example, in DE 100 39 739 A1 described. In the quick release device of this known hand tool, the clamping force is applied by a provided inside the hollow shaft compression spring, which is supported between an inner collar of the hollow shaft and a piston means in the interior of the hollow shaft. The piston means has a threaded bore extending in the longitudinal direction of the sleeve into which the previously mentioned bolt can be screwed. About said clamping lever and a cam mentioned piston means can be pressed against the spring force together with the bolt screwed therein down, so that the clamping flange is released on the bolt of the clamping flange on the hollow shaft. In this way, a clamping force is overcome and the bolt can be unscrewed together with clamping flange of the piston means and subtract from the hollow shaft, so that a new grinding or cutting disc can be used. Thereafter, the bolt is inserted back into the hollow shaft and only slightly screwed into the piston means. When the cocking lever is moved in the tensioning direction, the clamping force for holding the tool between the clamping flanges is applied by the mentioned spring.

Die Schnellspanneinrichtung ist jedoch aufwändig auf Grund der Vielzahl von Komponenten innerhalb der Hohlwelle und sie ist wenig bedienungsfreundlich, da zum Festspannen und Lösen eines Werkzeugs stets der Bolzen eingeschraubt beziehungsweise ausgeschraubt werden muss.However, the quick-clamping device is complicated due to the large number of components within the hollow shaft and it is not easy to use, since for tightening and loosening a tool always the bolt must be screwed or unscrewed.

Aus DE 44 26 969 A1 und ähnlich auch in EP 0 231 500 A2 ist eine sehr aufwändig konstruierte nicht gattungsgemäße Schnellspanneinrichtung bekannt, bei der eine vielzahl von Teilen an schwer zugänglichen Stellen benötigt werden.Out DE 44 26 969 A1 and similarly in EP 0 231 500 A2 is a very elaborately constructed non-generic quick-release device known in which a variety of parts are needed in hard to reach places.

Es finden auch Rollen im Inneren einer Hohlwelle Verwendung, die bei Drücken eines Betätigungselements in Ausweichräume treten, wodurch Keile ihre Sperrwirkung verlieren und ein Klemmflansch in axialer Richtung verschieblich ist, was dann das Lösen einer das Werkzeug klemmenden Spannmutter am Klemmflansch ermöglicht. Die vorrichtung ist insgesamt äußerst kompliziert aufgebaut und im Hinblick auf die auch hier aufzuschraubende Komponente beschwerlich zu bedienen.There are also rollers inside a hollow shaft use that occur when pressing an actuator in escape areas, causing wedges lose their locking effect and a clamping flange is displaced in the axial direction, which then allows the release of a tool clamping clamping nut on the clamping flange. The device is constructed overall extremely complicated and cumbersome to use in view of the aufzuschraubende here component.

Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, ein Werkzeuggerät der eingangs genannten Art im Hinblick auf eine einfache und dennoch sichere Konstruktion einer Schnellspanneinrichtung zu verbessern.The present invention is based on the object to improve a tool device of the type mentioned in terms of a simple, yet safe construction of a quick-release device.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Hohlwelle wenigstens eine fensterartige Öffnung aufweist, in der ein Klemmkörper angeordnet ist, und dass der Klemmkörper innen gegen den Bolzen und außen gegen eine federbelastete Schrägfläche anlegbar ist, so dass der Bolzen über den Klemmkörper in Folge der Federbelastung der Schrägfläche in der Hohlwelle klemmbar ist und hierdurch in der Hohlwelle gehalten wird.This object is achieved in that the hollow shaft has at least one window-like opening in which a clamping body is arranged, and that the clamping body against the inside and against the pin against a spring-loaded inclined surface can be applied, so that the bolt on the clamping body in consequence of Spring load of the inclined surface is clamped in the hollow shaft and thereby held in the hollow shaft.

Erfindungsgemäß werden also Klemmkörper unmittelbar zur Übertragung einer Klemmkraft oder Spannkraft auf den Bolzen verwendet. Der Bolzen überträgt diese Klemmkraft über seinen Klemmflansch auf das Werkzeug. Durch die Klemmkörper wird der Bolzen in axialer Richtung gezwungen. Ein besonderer Vorteil der erfindungsgemäßen Ausführung der Schnellspanneinrichtung ist darin zu sehen, dass sie sich quasi automatisch auf unterschiedliche Dicken des Werkzeugs, also auf insbesondere unterschiedliche Säge-, Schleif-, Trenn- oder Schruppscheibendicken einstellt. Das Werkzeug wird am Klemmflansch der Hohlwelle positioniert und dann braucht einfach der Bolzen in die Hohlwelle eingesteckt zu werden, bis sein Klemmflansch auf der Oberfläche des Werkzeugs satt anliegt. Wenn dann der Spannhebel in Klemmstellung gebracht wird, so zwingt die erwähnte federbelastete Schrägfläche den Klemmkörper gegen den Bolzen und erzeugt und überträgt auf diese Weise eine Klemmkraft auf den Bolzen. Die Schrägfläche ist dabei derart orientiert und federbelastet, dass über den Klemmkörper eine in Einsteckrichtung des Bolzens gerichtete Kraft auf den Klemmkörper beziehungsweise den Bolzen übertragen wird. Es versteht sich, dass vorzugsweise zwei solcher fensterartigen Aufnehmungen und Klemmkörper und federbelastete Schrägflächen vorgesehen sind. Obschon an sich verschiedene Geometrien für die Klemmkörper denkbar sind und dementsprechend vorzugsweise komplementär zu dieser Geometrie ausgebildete Wirkflächen bei dem Bolzen, erweist es sich als vorteilhaft, wenn die Klemmkörper von zylindrischen Rollenkörpern gebildet sind und der Bolzen in dem betreffenden Bereich eine abgeflachte, vorzugsweise ebene Oberfläche aufweist.According to the invention, clamping bodies are therefore used directly for transmitting a clamping force or clamping force to the bolt. The bolt transmits this clamping force via its clamping flange on the tool. By the clamp body of the bolt is forced in the axial direction. A particular advantage of the embodiment of the quick-release device according to the invention is the fact that it adjusts itself almost automatically to different thicknesses of the tool, that is to say in particular different sawing, grinding, cutting or roughing wheel thicknesses. The tool is positioned on the clamping flange of the hollow shaft and then simply needs the bolt to be inserted into the hollow shaft until its clamping flange rests snugly on the surface of the tool. Then, when the clamping lever is brought into the clamping position, so the mentioned spring-loaded inclined surface forces the clamping body against the bolt and generates and transmits in this way a clamping force on the bolt. The inclined surface is oriented and spring-loaded in such a way that a force directed in the insertion direction of the bolt is transmitted to the clamping body or the bolt via the clamping body. It is understood that preferably two such window-like receptacles and clamping body and spring-loaded inclined surfaces are provided. Although different geometries for the clamping body are conceivable per se and accordingly preferably complementary to this geometry formed active surfaces in the bolt, it proves to be advantageous if the clamping body are formed by cylindrical roller bodies and the bolt in the area concerned a flattened, preferably flat surface having.

Wenn die fensterartige Öffnung in vorteilhafter Weise langlochförmig oder in Längsrichtung der Hohlwelle langgestreckt ausgebildet ist, so kann ein entsprechender Stellweg realisiert werden.If the window-like opening is advantageously formed elongated hole-shaped or elongated in the longitudinal direction of the hollow shaft, so a corresponding travel can be realized.

In vorteilhafter Weise kann die fensterartige Öffnung durch eine Fräsung quer zur Längsrichtung der Hohlwelle auf einfache weise hergestellt werden.Advantageously, the window-like opening can be made by milling transverse to the longitudinal direction of the hollow shaft in a simple manner.

Die erwähnte Schrägfläche könnte an sich von beliebigen Konstruktionselementen, insbesondere von in Längsrichtung oder in Querrichtung verschieblichen keilförmigen Körpern gebildet werden. Es erweist sich in Weiterbildung der Erfindung jedoch als besonders vorteilhaft, wenn die Schrägfläche von einem die Hohlwelle in Umfangsrichtung umgebenden Körper, insbesondere mit zylindrischer Grundgeometrie gebildet ist. Dieser Körper weist dann vorzugsweise eine in Längsrichtung verlaufende zylindrische Bohrung auf, die im Wesentlichen dem Außendurchmesser der Hohlwelle entspricht, so dass der Körper über die Hohlwelle auf diese aufgeschoben sein kann. Die erwähnte Schrägfläche in dem Körper kann in vorteilhafter Weise durch eine quer zur Längsrichtung der Hohlwelle in den Körper eintauchende Freifräsung gebildet werden.The mentioned inclined surface could be formed per se of any construction elements, in particular of longitudinally or transversely displaceable wedge-shaped bodies. It turns out in development of the invention, however, to be particularly advantageous if the Inclined surface of a hollow shaft surrounding in the circumferential direction body, in particular is formed with a cylindrical basic geometry. This body then preferably has a longitudinally extending cylindrical bore, which corresponds substantially to the outer diameter of the hollow shaft, so that the body can be slid over the hollow shaft on this. The aforementioned inclined surface in the body can be advantageously formed by a free-milling dipping into the body transversely to the longitudinal direction of the hollow shaft.

Wie bereits erwähnt erweist es sich als vorteilhaft, wenn der wenigstens eine Klemmkörper eine Zylinderrolle ist und wenn der Bolzen im Bereich der fensterartigen Öffnung eine abgeflachte Oberfläche aufweist, die mit dem Klemmkörper zusammenwirkt.As already mentioned, it proves to be advantageous if the at least one clamping body is a cylindrical roller and if the bolt in the region of the window-like opening has a flattened surface which interacts with the clamping body.

Des Weiteren erweist es sich als vorteilhaft, wenn der Bolzen eine komplementär zur Form des Klemmkörpers ausgebildete Oberflächengestalt aufweist, und zwar über eine Längserstreckung, die größer ist als die fensterartige Öffnung in der Hohlwelle. Auf diese Weise ist es möglich, dass sich die Schnellspanneinrichtung auf verschiedene Dicken des Werkzeugs automatisch einstellen kann.Furthermore, it proves to be advantageous if the bolt has a complementary shape to the shape of the clamping body formed surface shape, over a longitudinal extent which is greater than the window-like opening in the hollow shaft. In this way, it is possible that the quick-clamping device can automatically adjust to different thicknesses of the tool.

Des Weiteren erweist es sich als vorteilhaft, wenn der Klemmkörper einen Durchmesser aufweist, der das 0,5 bis 8-fache der wanddicke der Hohlwelle in diesem Bereich beträgt.Furthermore, it proves to be advantageous if the clamping body has a diameter which is 0.5 to 8 times the wall thickness of the hollow shaft in this area.

Eine besonders gute Klemmwirkung wird erreicht, wenn die Schrägfläche eine Neigung zur Längsrichtung der Hohlwelle von 1 bis 15° aufweist.A particularly good clamping effect is achieved when the inclined surface has a tendency to the longitudinal direction of the hollow shaft of 1 to 15 °.

Der Spannhebel ist bei einer bevorzugten Ausführungsform des erfindungsgemäßen Werkzeuggeräts ein Exzenterhebel, der über eine gegenüber dem Gehäuse feste Achse verschwenkbar ist und gegen einen Nocken abrollt, der mittelbar oder unmittelbar die federbelastete Schrägfläche entgegen ihrer Federvorspannung verdrängt. Auf diese Weise wird der Klemmkörper außer Klemmstellung gebracht, und der Bolzen kann aus der Hohlwelle herausgezogen werden. An dieser Stelle sei auch erwähnt, dass es sich als besonders vorteilhaft erweist, dass bei der erfindungsgemäßen Schnellspanneinrichtung der Bolzen nicht eingeschraubt oder ausgeschraubt zu werden braucht; es müssen keinerlei Ein- oder Ausschraubbewegungen ausgeführt werden. Der Bolzen wird lediglich in die Hohlwelle eingesteckt bis er satt gegen die Oberfläche des Werkzeugs anliegt, wobei die Werkzeugdicke automatisch akkommodiert wird. Entsprechend braucht der Bolzen zur Demontage des Werkzeugs nach Lösen der Klemmkörper lediglich aus der Hohlwelle wieder in axialer Richtung herausgezogen werden.The tensioning lever is in a preferred embodiment of the power tool according to the invention an eccentric lever which is pivotable about a fixed axis relative to the housing and rolls against a cam which indirectly or directly displaces the spring-loaded inclined surface against its spring bias. In this way, the clamping body is brought out of clamping position, and the bolt can be pulled out of the hollow shaft. It should also be mentioned at this point that it proves to be particularly advantageous that in the quick-release device according to the invention the bolt need not be screwed or unscrewed; no screwing in or unscrewing movements has to be carried out. The bolt is only inserted into the hollow shaft until it fits snugly against the surface of the tool, the tool thickness is automatically accommodated. Accordingly, the bolt for disassembly of the tool needs to be pulled out of the hollow shaft again in the axial direction after loosening the clamping body.

Die Federvorspannung der Schrägfläche kann in an sich beliebiger Weise dadurch erfolgen, dass sich eine Feder gegenüber einem an der Hohlwelle vorgesehenen Widerlager einenends abstützt und anderenends die Schrägfläche beziehungsweise einen die Schrägfläche bildenden Körper belastet. Es erweist sich als vorteilhaft, wenn die Schrägfläche von einem Tellerfederpaket belastet ist, welches die Hohlwelle insbesondere konzentrisch umgibt und sich einenends gegen die Hohlwelle abstützt. Das Tellerfederpaket kann dann in konstruktiv einfacher Weise gegen einen Ringbund an der Außenseite der Hohlwelle oder gegen radial vorstehende Vorsprünge an der Hohlwelle abgestützt sein.The spring preload of the inclined surface can take place in any desired manner in that one spring is supported at one end relative to an abutment provided on the hollow shaft and at the other end the oblique surface or a body forming the inclined surface is loaded. It proves to be advantageous if the inclined surface is loaded by a plate spring package, which surrounds the hollow shaft in particular concentric and is supported at one end against the hollow shaft. The disc spring assembly can then be supported in a structurally simple manner against a collar on the outside of the hollow shaft or against radially projecting projections on the hollow shaft.

Es erweist sich als besonders vorteilhaft, wenn die Schnellspanneinrichtung so ausgebildet ist, dass sie Werkzeugdicken von 1 bis 12 mm ohne Veränderung weiterer Komponenten adaptieren kann.It proves to be particularly advantageous if the quick-clamping device is designed so that it can adapt tool thicknesses of 1 to 12 mm without changing other components.

Weitere Merkmale, Einzelheiten und vorteile der Erfindung ergeben sich aus der beigefügten zeichnerischen Darstellung und nachfolgenden Beschreibung einer bevorzugten Ausführungsform des erfindungsgemäßen Werkzeuggeräts. In der zeichnung zeigt:

Figur 1
eine schematische Darstellung einer Schnellspanneinrichtung bei einem erfindungsgemäßen Werkzeuggerät, teilweise im Schnitt;
Figur 2
eine perspektivische Darstellung der Schnellspanneinrichtung nach Figur 1.
Further features, details and advantages of the invention will become apparent from the accompanying drawings and the following description of a preferred embodiment of the inventive tooling device. In the drawing shows:
FIG. 1
a schematic representation of a quick-release device in a power tool according to the invention, partly in section;
FIG. 2
a perspective view of the quick release device according to FIG. 1 ,

Figur 1 zeigt eine insgesamt mit dem Bezugszeichen 2 bezeichnete Schnellspanneinrichtung bei einem Werkzeuggerät, insbesondere Handwerkzeuggerät, mit einem flächenhaften werkzeug 4, beispielsweise in Form einer Trennscheibe, Schruppscheibe oder Schleifscheibe oder eines Sägeblatts. Das Werkzeuggerät ist lediglich durch eine Gehäusewandung 6 angedeutet. Die Schnellspanneinrichtung 2 umfasst einen Spannhebel 8, der um eine gehäusefeste Achse 10 zwischen einer in Figur 1 eingenommenen Spannstellung und einer durch den Pfeil 12 dargestellten Freigabestellung verschwenkbar ist. FIG. 1 shows a generally designated by the reference numeral 2 quick-clamping device in a tool device, in particular hand tool, with a planar tool 4, for example in the form of a cutting disc, grinding wheel or grinding wheel or a saw blade. The tool device is indicated only by a housing 6. The quick-clamping device 2 comprises a clamping lever 8, which is a housing-fixed axis 10 between a in FIG. 1 assumed clamping position and a release position shown by the arrow 12 is pivotable.

Des Weiteren umfasst die Schnellspanneinrichtung 2 eine Hohlwelle 14 mit einem Klemmflansch 16 und einen Bolzen 18 mit einem Klemmflansch 20- Der Bolzen 18 ist in Längsrichtung 22 der Hohlwelle 14 in diese einsteckbar.Furthermore, the quick-clamping device 2 comprises a hollow shaft 14 with a clamping flange 16 and a bolt 18 with a clamping flange 20- The bolt 18 can be inserted in the longitudinal direction 22 of the hollow shaft 14 in this.

Anlageflächen 24, 26 der Klemmflansche 16 und 20 sind dann einander zugewandt und können das flächenhafte Werkzeug 4 zwischen sich halten und festklemmen. Je nach Dicke d des Werkzeugs 4 ist der Bolzen 18 mehr oder weniger weit in die Hohlwelle 14 eingeschoben bis die Anlageflächen 24, 26 der Klemmflansche 16, 20 in flächenhafte satte Anlage an die Oberfläche des Werkzeugs 4 gelangen.Contact surfaces 24, 26 of the clamping flanges 16 and 20 are then facing each other and can hold and clamp the planar tool 4 between them. Depending on the thickness d of the tool 4, the bolt 18 is inserted more or less far into the hollow shaft 14 until the contact surfaces 24, 26 of the clamping flanges 16, 20 reach the surface of the tool 4 in a flat fit.

Zur Fixierung des Bolzens 18 und zur Einleitung einer Klemmkraft auf die Klemmflansche 16, 20 umfasst die Hohlwelle im dargestellten beispielhaften Fall zwei fensterartige Öffnungen 28, die quer zur Längsrichtung 22 in die Hohlwelle 14 eingebracht sind. In diesen fensterartigen Öffnungen 28 ist jeweils ein im beispielhaft dargestellten Fall walzen- oder rollenförmiger Klemmkörper 30 angeordnet, dessen Rollendurchmesser größer ist als die Wanddicke der Hohlwelle 14. Der jeweilige Klemmkörper 30 steht daher in das Innere 32 der Hohlwelle 14 und nach außerhalb der Hohlwelle 14 vor. Der jeweilige Klemmkörper wirkt außen mit einer jeweiligen Schrägfläche 34 zusammen, die zur Längsrichtung 22 der Hohlwelle 14 geneigt ist. Die Schrägfläche 34 ist von einem Körper 36 mit im beispielhaft dargestellten Fall im Wesentlichen kreiszylindrischer Grundgeometrie gebildet. Er umgibt die Hohlwelle 14 konzentrisch in Umfangsrichtung und weist hierfür eine in Längsrichtung 22 verlaufende kreiszylindrische Öffnung auf, mit der er auf die Hohlwelle 14 aufgeschoben ist. Außerdem besitzt er eine quer zur Längsrichtung 22 der Hohlwelle 14 von einer Seite eingebrachte Freifräsung 38, die am Besten aus Figur 2 ersichtlich ist, wobei durch diese Freifräsung im Inneren des Körpers 36 die genannten Schrägflächen 34 gebildet sind. Der Körper 36 ist im beispielhaft dargestellten Fall über ein Tellerfederpaket 40 in Richtung auf den Spannhebel 8, also von den Klemmflanschen 16, 20 weg, vorgespannt. Das Tellerfederpaket 40 stützt sich gegen ein lediglich schematisch angedeutetes Widerlager 42 am Außenumfang der Hohlwelle 14 ab. Durch die vorspannung des Körpers 36 und damit der Schrägflächen 34 werden die Klemmkörper 30 - bei eingestecktem Bolzen 18 - gegen die äußere Oberfläche des Bolzens 18 gedrückt und ziehen den Bolzen 18 dabei in Richtung des Pfeils 44, so dass sein Klemmflansch 20 gegen den Klemmflansch 16 der Hohlwelle 14 gezwungen wird. Auf diese weise wird eine das Werkzeug 4 zwischen den Klemmflanschen 16, 20 haltende Spannkraft erzeugt und aufrechterhalten.For fixing the bolt 18 and for introducing a clamping force on the clamping flanges 16, 20, the hollow shaft in the illustrated exemplary case, two window-like openings 28 which are introduced transversely to the longitudinal direction 22 in the hollow shaft 14. In these window-like openings 28 a roller-shaped or roller-shaped clamping body 30 is arranged in each case, whose roller diameter is greater than the wall thickness of the hollow shaft 14. The respective clamping body 30 is therefore in the interior 32 of the hollow shaft 14 and outwardly of the hollow shaft fourteenth in front. The respective clamping body cooperates on the outside with a respective inclined surface 34, which is inclined to the longitudinal direction 22 of the hollow shaft 14. The oblique surface 34 is formed by a body 36 having a substantially circular-cylindrical basic geometry, as illustrated by way of example. It surrounds the hollow shaft 14 concentrically in the circumferential direction and for this purpose has a circular cylindrical opening extending in the longitudinal direction 22, with which it is pushed onto the hollow shaft 14. He also has a transverse to the longitudinal direction 22 of the hollow shaft 14 introduced from one side free-milling 38, the best of FIG. 2 it can be seen, wherein the said inclined surfaces 34 are formed by this free-cutting in the interior of the body 36. In the case illustrated by way of example, the body 36 is pretensioned via a disk spring package 40 in the direction of the tensioning lever 8, that is to say away from the clamping flanges 16, 20. The plate spring package 40 is supported against a merely schematically indicated abutment 42 on the outer circumference of the hollow shaft 14 from. By the bias of the body 36 and thus the inclined surfaces 34, the clamping body 30 - with inserted pin 18 - pressed against the outer surface of the bolt 18 and pull the bolt 18 while in the direction of arrow 44, so that its clamping flange 20 against the clamping flange 16 the hollow shaft 14 is forced. In this way, the tool 4 between the clamping flanges 16, 20 holding clamping force is generated and maintained.

Zum Lösen des Werkzeugs ist ein von dem Spannhebel 8 mittelbar oder unmittelbar beaufschlagtes Stellelement 46, im beispielhaft dargestellten Fall in Form eines mit topfförmiger Geometrie ausgebildeten Körpers, vorgesehen, welches in Längsrichtung 22 verschieblich ausgebildet ist und in Richtung auf den Spannhebel 8 durch ein an sich beliebiges Federmittel 48 vorgespannt ist. Wird der Spannhebel 8 ausgehend von der in Figur 1 dargestellten Position in Richtung des Pfeils 12 in Freigabestellung verschwenkt, so drückt der exzentrische Spannhebel das Stellelement 46 in Längsrichtung 22 entgegen der Pfeilrichtung 44 nach unten, bis das Stellelement nach einem gewissen Stellweg gegen den Körper 36 anläuft und diesen ebenfalls entgegen der Wirkung des Tellerfederpakets 40 nach unten bewegt. Hierdurch gelangen aber die Klemmkörper 30 außer Klemmstellung und der Bolzen 18 kann ohne dass eine Schraubbewegung ausgeführt werden muss, nach unten aus der Hohlwelle 14 abgezogen werden. Das Werkzeug 4 kann dann gegen ein neues ausgetauscht werden. Dann wird der Bolzen 18 wieder in die Hohlwelle 14 eingesteckt, und zum Festspannen des neu eingesetzten Werkzeugs wird der Spannhebel 8 wieder in die in Figur 1 dargestellte Position zurückbewegt. Währenddessen wird unter der Wirkung des Tellerfederpakets 40 der Körper 36 in Richtung des Pfeils 44 verstellt, wodurch die Klemmkörper 30 wieder in Klemmstellung gezwungen werden. Das Stellelement 46 wird schließlich unter der Wirkung des Federmittels 48 von dem in seiner Klemmendstellung befindlichen Körper 36 abgehoben und in die in Figur 1 dargestellte Ausgangsposition zurückbewegt. An Stelle des Federmittels 48 könnte selbstverständlich auch eine sonstige Zwangskopplung zwischen Spannhebel und Stellelement vorgesehen sein. Es wäre auch denkbar, dass der Spannhebel über geeignete exzentrische Bereiche direkt auf das Stellelement 46 einwirkt.For releasing the tool, a directly or indirectly acted upon by the clamping lever 8 actuator 46, in the example shown in the form of a cup-shaped geometry formed body provided, which is designed to be displaceable in the longitudinal direction 22 and in the direction of the clamping lever 8 by a per se any spring means 48 is biased. If the clamping lever 8, starting from the in FIG. 1 pivoted position shown in the direction of arrow 12 in the release position, so presses the eccentric clamping lever 46 in the longitudinal direction 22 against the arrow 44 down until the actuator starts after a certain travel against the body 36 and this also against the action of the plate spring package 40th moved down. As a result, but reach the clamping body 30 except clamping position and the bolt 18 can be performed without a screwing movement, are pulled down from the hollow shaft 14. The tool 4 can then be replaced with a new one. Then, the bolt 18 is again inserted into the hollow shaft 14, and for clamping the newly inserted tool, the clamping lever 8 is again in the in FIG. 1 moved back position shown. Meanwhile, under the action of the cup spring package 40, the body 36 is moved in the direction of Adjusted arrow 44, whereby the clamping body 30 are forced back into clamping position. The actuator 46 is finally lifted under the action of the spring means 48 of the located in its Klemmendstellung body 36 and in the in FIG. 1 moved back home position shown. Instead of the spring means 48 could of course also be provided a different positive coupling between clamping lever and actuator. It would also be conceivable that the tensioning lever acts directly on the adjusting element 46 via suitable eccentric areas.

Das Werkzeuggerät ist dann weiter so ausgebildet, dass die beschriebenen Komponenten bestehend aus Hohlwelle 14, Körper 36 mit Schrägflächen 34, einschließlich Tellerfederpaket 40 und Bolzen 18 rotierend oder oszillierend antreibbar sind. Hierfür wäre es beispielsweise denkbar, dass auf der Hohlwelle 14 ein Antriebszahnrad sitzt, das in der schematischen Darstellung der Figur 1 aber nicht gezeigt ist. Lediglich angedeutet ist ein Radiallager 50.The tool device is then further designed so that the described components consisting of hollow shaft 14, body 36 with inclined surfaces 34, including plate spring package 40 and pin 18 are driven in rotation or oscillating. For this purpose, it would be conceivable, for example, that on the hollow shaft 14, a drive gear is seated, which in the schematic representation of FIG. 1 but not shown. Only indicated is a radial bearing 50.

Figur 2 zeigt wiederum schematisch eine perspektivische Darstellung von Hohlwelle 14 mit eingestecktem Bolzen 18 sowie Körper 36 mit Schrägflächen 34 und Klemmkörpern 30. Ferner angedeutet ist das Tellerfederpaket 40. Man erkennt die fensterartigen Öffnungen 28, die durch Freifräsungen von radial außen in die Hohlwelle 14 eingebracht sind. FIG. 2 again schematically shows a perspective view of hollow shaft 14 with inserted pin 18 and body 36 with inclined surfaces 34 and clamping bodies 30. Further indicated is the plate spring package 40. It can be seen the window-like openings 28 which are introduced by free grooves from radially outside into the hollow shaft 14.

Claims (13)

  1. Power tool, in particular a hand-held power tool, with a planar tool (4), such as a cutoff wheel, roughing wheel, grinding disc or saw-blade, and with a quick-clamping device (2) for the planar tool, comprising a clamping lever (8), through the activation of which the quick-clamping device (2) can be transferred from a clamping position where it firmly clamps the tool (4) into a release position allowing the tool to be released, and vice versa, a hollow shaft (14), with a bolt (18) which can be inserted into the hollow shaft (14) in the longitudinal direction (22) thereof, the hollow shaft (14) and the bolt (18) having gripping flanges (16, 20) between which the tool (4) can be gripped, characterised in that the hollow shaft (14) has at least one window-like aperture (28) in which a gripping member (30) is arranged, and in that the gripping member (30) can be applied to the bolt (18) on the inside and to a spring-loaded inclined face (34) on the outside, so that the bolt (18), because of the spring-loading of the inclined face (34), can be gripped in the hollow shaft (14) by means of the gripping member (30) and is thus held in the hollow shaft (14).
  2. Power tool according to claim 1, characterised in that two window-like apertures (28) and two gripping members (30) are provided.
  3. Power tool according to either claim 1 or claim 2, characterised in that the window-like aperture (28) is slot-shaped.
  4. Tool according to any one of claims 1, 2, and 3, characterised in that the window-like aperture (28) is formed by a milled cut transverse to the longitudinal direction (22) of the hollow shaft (14).
  5. Power tool according to any one of the preceding claims, characterised in that the inclined face (34) is formed from a member (36) surrounding the hollow shaft (14) in the circumferential direction, in particular with a fundamentally cylindrical shape.
  6. Power tool according to claim 5, characterised in that the inclined face (34) is formed in the body (36) by an open milled cut transverse to the longitudinal direction (22) of the hollow shaft (14).
  7. Power tool according to any one of the preceding claims, characterised in that the at least one gripping member (30) is a cylinder roll.
  8. Power tool according to any one of the preceding claims, characterised in that the bolt (18) in the region of the window-like aperture has a levelled upper surface, which interacts with the gripping member (30).
  9. Power tool according to any one of the preceding claims, characterised in that the gripping member (30) has a diameter which is 0.5 - 8 times the thickness of the walls of the hollow shaft (14) in this region.
  10. Power tool according to any one of the preceding claims, characterised in that the inclined face (34) has an inclination of 1 - 15 degrees to the longitudinal direction (22) of the hollow shaft (14).
  11. Power tool according to any one of the preceding claims, characterised in that the clamping lever (8) is a cam lever or knee-lever.
  12. Power tool according to any one of the preceding claims, characterised in that the inclined face (34) is loaded by a disc spring pack (40), which surrounds the hollow shaft (14) and rests against the hollow shaft at one end.
  13. Power tool according to any one of the preceding claims, characterised in that the quick-clamping device (2) can adapt to a tool thickness (d) of 1 - 12 mm without the alteration of any other components.
EP05025876A 2005-11-28 2005-11-28 Motor driven hand tool with a rapid clamping device Active EP1790434B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05025876A EP1790434B1 (en) 2005-11-28 2005-11-28 Motor driven hand tool with a rapid clamping device
AT05025876T ATE389510T1 (en) 2005-11-28 2005-11-28 TOOL WITH QUICK CLAMPING DEVICE
DE502005003376T DE502005003376D1 (en) 2005-11-28 2005-11-28 Tool device with quick clamping device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05025876A EP1790434B1 (en) 2005-11-28 2005-11-28 Motor driven hand tool with a rapid clamping device

Publications (2)

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EP1790434A1 EP1790434A1 (en) 2007-05-30
EP1790434B1 true EP1790434B1 (en) 2008-03-19

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EP05025876A Active EP1790434B1 (en) 2005-11-28 2005-11-28 Motor driven hand tool with a rapid clamping device

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EP (1) EP1790434B1 (en)
AT (1) ATE389510T1 (en)
DE (1) DE502005003376D1 (en)

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CN102528768A (en) * 2010-12-07 2012-07-04 南京德朔实业有限公司 Power tool
US10144110B2 (en) 2012-02-03 2018-12-04 Makita Corporation Work tool
US11045939B2 (en) 2018-03-28 2021-06-29 Makita Corporation Power tool
RU2752491C2 (en) * 2016-10-18 2021-07-28 Роберт Бош Гмбх Quick-clamping device for a portable technological machine having at least one rotating output shaft, in particular an angle grinder

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EP2371487B1 (en) * 2010-03-30 2014-09-17 Monti-Werkzeuge Gmbh Rotatable rotating tool device
DE102010064372B4 (en) * 2010-12-30 2022-06-23 Robert Bosch Gmbh Hand machine tool clamping device
US9174354B2 (en) * 2011-05-18 2015-11-03 Chevron (Hk) Limited Power tool
JP2013094905A (en) * 2011-11-01 2013-05-20 Makita Corp Working tool
JP6403589B2 (en) * 2015-02-02 2018-10-10 株式会社マキタ Work tools
DE102016220343A1 (en) * 2016-10-18 2018-04-19 Robert Bosch Gmbh Quick-clamping device for a portable power tool having at least one output shaft which can be driven in rotation, in particular an angle grinder
DE102017218622A1 (en) * 2017-04-12 2018-10-18 Robert Bosch Gmbh Abrasive device, in particular grinding plate device or support plate device
US11590593B2 (en) 2019-11-28 2023-02-28 Makita Corporation Power tool
US11660690B2 (en) 2019-11-28 2023-05-30 Makita Corporation Power tool
JP7422538B2 (en) 2019-12-26 2024-01-26 株式会社マキタ Work tools
JP7330914B2 (en) 2020-02-13 2023-08-22 株式会社マキタ vibration tool

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DE3603384A1 (en) 1986-02-05 1987-08-06 Bosch Gmbh Robert DEVICE FOR DETACHABLE FASTENING OF A DISC-SHAPED TOOL
DE59101383D1 (en) * 1991-01-16 1994-05-19 Fein C & E Portable grinder with quick clamping device.
DE4336620C2 (en) * 1993-10-27 1997-07-03 Fein C & E Power tool with a clamping device that can only be operated when the engine is switched off
DE4426969B4 (en) 1994-07-29 2004-12-09 Robert Bosch Gmbh Hand machine tool with a work spindle carrying a disk-shaped, detachably fastened tool
DE10039739A1 (en) 2000-08-16 2002-02-28 C & E Fein Gmbh & Co Kg Power tool with quick release device

Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN102528768A (en) * 2010-12-07 2012-07-04 南京德朔实业有限公司 Power tool
CN102528768B (en) * 2010-12-07 2014-10-15 南京德朔实业有限公司 Power tool
US10144110B2 (en) 2012-02-03 2018-12-04 Makita Corporation Work tool
RU2752491C2 (en) * 2016-10-18 2021-07-28 Роберт Бош Гмбх Quick-clamping device for a portable technological machine having at least one rotating output shaft, in particular an angle grinder
US11045939B2 (en) 2018-03-28 2021-06-29 Makita Corporation Power tool

Also Published As

Publication number Publication date
ATE389510T1 (en) 2008-04-15
EP1790434A1 (en) 2007-05-30
DE502005003376D1 (en) 2008-04-30

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