EP2291264B1 - Power tool, particularly a hand-held power tool - Google Patents
Power tool, particularly a hand-held power tool Download PDFInfo
- Publication number
- EP2291264B1 EP2291264B1 EP09765664.9A EP09765664A EP2291264B1 EP 2291264 B1 EP2291264 B1 EP 2291264B1 EP 09765664 A EP09765664 A EP 09765664A EP 2291264 B1 EP2291264 B1 EP 2291264B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- power tool
- clamping
- clamping band
- tool according
- band
- 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.)
- Not-in-force
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/04—Protective covers for the grinding wheel
- B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
- B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
Definitions
- the invention relates to a machine tool, in particular a hand tool, such as an angle grinder, according to the preamble of claim 1.
- the DE 102 59 520 A1 discloses an electric hand tool with a disc-shaped, rotating tool, which is overlapped by a protective hood, which is fastened by means of a clamp on a clamping neck of the machine tool.
- the clamp has radially projecting end portions which are held together by a screw, with increasing screwing the screw, the clamp is further tensioned and exerts a radial clamping force on the clamping neck of the machine tool.
- the clamp is provided with a locking member which is articulated on the outside of the clamp band and having a locking member which protrudes through a recess in the clamp band and engages latching in a toothing on the outer surface of the clamping neck.
- the catch component is to be manually pivoted between the latching and the non-latching position.
- the positive connection which is set via the locking component, prevents rotation of the guard on the clamping neck, whereby the safety is improved, in particular in the event of tool breakage.
- the DE 10 2007 041 840 A1 discloses an angle grinder with a protective cover which is to be fastened on a clamping neck of the angle grinder with the aid of a tension band.
- the tension band extends over an angular range of slightly more than 270 °, wherein the remaining angle portion is bridged by a rocker which is pivotally supported on a hinge of the tension band. To attach a screw is screwed into a threaded section on the rocker.
- the invention has for its object to make a machine tool, in particular a hand tool, with respect to the attachment of their guard to the effect that can be realized even with short travel for the user a simple and secure structure.
- the diameter of the clamping band can also be widened with little manual effort, so that the clamping band as a whole, including optionally arranged thereon locking elements or latching means can be brought into the release position.
- a preferred embodiment are accordingly preferably on the pivot portion, but possibly also on the supporting part of this strap additional locking means to provide or to actuate such locking means on the pivot portion and / or this supporting part of the clamping band, said locking means quickly and safely into the locking position or the emergency stop position can be transferred.
- the machine tool, against the clamping neck of the protective cover is to be determined by means of the clamping band is circumferentially provided on the clamping neck expediently with a circumferentially extending teeth.
- This toothing is used to engage the locking band provided on the tensioning band, in particular on the pivoting portion of the tensioning band, when the tensioning band is tensioned.
- a groove extending in the circumferential direction is additionally introduced on the clamping neck, which preferably serves for axial securing by a pin or pin or the like, which is formed on the clamping band or on the guard, engages in this circumferential groove.
- Possible is both a separate execution of the circumferential groove and extending in the circumferential direction toothing and a coupled embodiment in which the toothing extends with the individual circumferentially successive tooth-shaped recesses starting directly from the circumferential groove in the axial direction.
- the protective hood according to the invention is used for a machine tool, in particular a hand-held power tool such as an angle grinder, wherein the protective cover rotates stored tool of the machine tool overlaps and attach by means of a fastening device to a clamping neck of the machine tool.
- the fastening device has a clamping band to be laid around the clamping neck, which is to be tensioned by means of an actuating element.
- a portion of the clamping collar to be laid around the clamping neck is designed as a pivoting section, which is held pivotably in relation to an adjacent section on the clamping band. With the release of the actuating element of the pivoting portion of the clamping band is to be converted into a radially pivoted position.
- the pivoting portion is located on the inside of the clamping band, in particular in the region of the pivot portion at least one locking element, which rests with tensioned tensioning strap on the clamping neck and preferably engages positively in an associated recess on the outside of the clamping neck.
- the radially inwardly extending latching element is automatically transferred to the pivoting of the pivoting portion in the non-latching position.
- the pivoting portion is pivoted from a pivoted position into a position approximating the clamping neck for fastening the protective hood, whereby at the same time the locking elements on the inside of the pivoting portion reach the locking position.
- the pivoting of the pivot portion is expediently so far pronounced that the locking elements are on the inside in the pivoted state in the non-latching position.
- the tensioned state which also marks the locking position, however, takes the pivot portion expediently the same curvature as the adjacent clamping band sections, so that the clamping band including pivot portion has a circular shape.
- a locking element on a portion of the clamping band outside the pivot portion.
- This locking element or the locking elements may be additionally or alternatively provided to the locking element on the pivoting portion.
- the transfer of the pivoting portion in the pivoted position takes place by acting on the actuating element.
- the head or the free end of the screw is located on a component of the pivot portion and adjusted the pivot portion either active in the pivoted position or allows pivoting by spring force, in the latter case, the actuator is not active in the swing section in the pivoted state transferred, but holds the pivot portion against the force of the spring element in the cocked position.
- the transfer of the actuating element in the relaxed position is thus either actively or passively transferred the pivot portion of the actuating element in the pivoted position.
- the component on the pivoting portion, which is acted upon by the actuating element, according to the invention is designed as a hold-down, wherein the actuating element when releasing the hold-down acts on the pivot portion in such a manner that the pivoting portion is transferred to a radially pivoted position.
- the hold-down may extend radially outward on the tension band, but is also possible a version with additional tangential component.
- the screw presses against the hold-down and thereby acts on the pivoting portion in the expanded position.
- the pivot portion is spring loaded in the expanded position, wherein in the fastened state, the screw acts on the hold-down and thereby secures the pivot portion in the pivoted position.
- the pivoting portion With the release of the screw, the pivoting portion can swing outward under the action of the spring force.
- the spring force is generated either via a separate spring element, which may for example be arranged in the joint of the pivot portion, or by the residual stress of the pivot portion, which can be achieved, for example, by a corresponding embossing of the joint connecting the pivot portion with the remaining portions of the tension band.
- the joint is preferably designed in the manner of a film hinge as a section with reduced wall thickness in the clamping band or by an impression that allows pivoting of the pivoting portion.
- a protective hood which also forms a replacement and / or retrofit component as a functional unit with its fastening device, can also be used in many machine tools - at least without much adaptation effort - in exchange for protective hoods of a different design.
- the invention also relates to the tension band as such that is provided in particular for fixing the guard on the clamping neck of the machine tool and this fast, easy, safe and possibly lockable with little effort and easy for the user operation allows that it has a swing-out peripheral portion as a pivot portion, which is acted upon by the actuating element and which is pivotable in a radially pivoted release position, said pivoting is actively accessible via the actuating element or, after release by the actuating element also passively via a spring arrangement or the like.
- Fig. 1 shows a protective hood 1, which is attached to a machine tool, in particular to a power tool such as an angle grinder.
- a fastening device 5 which surrounds a cylindrical, integrally formed with the main body of the protective cover 1 collar 4, which on a clamping neck of the machine tool is postponed.
- a bearing 3 for rotatably supporting the tool.
- the fastening device 5 for fastening the protective cover 1 on the clamping neck 2 comprises a clamping band 6, which is designed as a clamp and is to be tensioned by a screw 10.
- the screw 10 forms an actuating element for tensioning and loosening the tensioning band 6 and is guided through end-side, radially projecting end portions 6a and 6b of the tensioning band, which are each provided with recesses through which the screw is passed.
- the screw is secured by a nut on the strap.
- the longitudinal axis of the screw 10 extends relative to the clamping band 6 in the closed state in the tangential direction.
- the tension band 6 has a pivoting portion 7, which is part of the tension band and extends over an angular segment of the tension band and is placed around the tension neck 2 of the machine tool.
- the pivoting portion 7 is connected via a rotary or pivot joint 9 with an immediately adjacent portion 8 of the clamping band, wherein the hinge 9 has an axis of rotation which is parallel to the axis of rotation of the tool.
- the hinge 9 allows the pivot portion 7 to pivot about the hinge to a radially expanded position.
- Fig. 1 the tensioning band 6 is shown in the cocked position, in which the screw 10 is tightened so far that the clamping band 6 is tightened around the clamping neck 2 and exerts a radial clamping force on the clamping neck, via which the protective hood is connected to the clamping neck.
- two radially inwardly directed locking elements 11 are arranged, which lie in the tensioned state of the clamping band 6 in a latching position with associated recesses in the lateral surface of the clamping neck 2.
- a latching fuse which acts in the circumferential direction and expediently also in the axial direction.
- a further latching element 14 is arranged on the inside of the clamping band 6 outside of the pivoting portion 7. This additional locking element 14 is used in particular for axial securing on the clamping neck.
- a radially projecting hold-down 12 with which the head of the screw 10 is in contact.
- the hold-down 12 has the task to support the Aufschwenkiolo the pivot portion when loosening the screw 10.
- Fig. 2 the fastening device 5 is shown in the released state, in which the pivoting portion 7 is pivoted radially about its hinge 9, so that the pivot portion 7 is at a radial distance from the inner diameter 13, which is enclosed by the clamping band 6 in the tensioned state.
- the head of the screw presses against the hold-down 12. Since the hold-down 12 is arranged at a distance from the axis of the joint 9 on the pivot portion 7, by the contact between the screw and hold-down and unscrewing the Screw from the end-side end portions 6a and 6b of the clamping band 6 of the pivot portion 7 pivoted about its hinge 9.
- the hinge 9 between the pivot portion 7 and the adjacent portion 8 of the tension band 6 can be prepared in a simple mechanical manner, characterized in that the end portion of the pivot portion 7 is bent over a hook and engages around a journal, which at the associated, end face of the section 8 formed or is arranged.
- the spring element may be formed integrally with the tension band 6, for example, in that the joint 9 is formed only as a tapered wall portion or as an impression in the tension band and the pivot portion 7, a bias is applied. But it is possible to form the spring element as a separate component, which is arranged for example in the region of the joint 9 and the force applied to the pivoting portion in one of its end positions.
- the tension band 6 is also equipped with a radially swing-pivoting portion 7, which is rotatably connected via the hinge 9 with the adjacent portion 8 of the tension band.
- the front end portions 6a and 6b are not formed as a radial projection, but as circumferentially extending and overlapping portions which are held together by the screw 10, wherein the screw 10 extends in the radial direction.
- the hold-down 12 abuts the head of the screw 10 and extends on the outside of the pivot portion 7 with a radial component and a component in the circumferential direction.
- the free end face of the blank holder 12 is located on the head of the screw 10, so that with the loosening of the screw 10 of the hold-down is bent back and thereby creates a force that leads together with the distance to the hinge 9 to a aufschwenkenden moment.
- the embodiment according to Fig. 4 illustrates a combination of the embodiments Fig. 1 and Fig. 3 at Fig. 4 are the front end portions of the clamping band 6 radially projecting, wherein in this area the screw 10 is guided as an actuating element by recesses in the end portions and holds them together with a clamping force.
- the hold-down 12, the free end face rests on the head of the screw 10 is formed in a similar manner as in the embodiment 3 and extends on the outside of the pivot portion 7 with a component in both the radial direction and in the circumferential direction.
- a bearing flange 19 of the machine tool comprising a base plate 20 and the integrally formed with the base plate clamping neck 2, in which the bearing 3 is received for the drive spindle 4.
- a toothing 21 is introduced, consisting of a plurality extending in the axial direction and distributed over the circumference tooth-shaped depressions, which are associated with the locking element of the locking member, wherein the locking element protrudes in the latching position in each case a tooth-shaped recess.
- the tooth-shaped depressions each extend axially from a circumferential groove 22, which extends over the entire circumference of the clamping neck 2.
- the locking element of the locking member can be moved.
- a detent element separately formed component such as a pin or the like in the circumferential groove and thereby secures the clamp and the protective cover in the axial direction on the clamping neck.
- the toothing 21 is formed separately from the circumferential groove 22.
- the toothing 21 is adjacent to the top of the base plate 20, the circumferential groove 22, however, adjacent to the end face of the clamping neck 2.
- a separately formed by the locking member component protrudes into the circumferential groove 22, such as a pin or the like.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Clamps And Clips (AREA)
Description
Die Erfindung betrifft eine Werkzeugmaschine, insbesondere eine Handwerkzeugmaschine wie beispielsweise einen Winkelschleifer, gemäß dem Oberbegriff des Anspruch 1.The invention relates to a machine tool, in particular a hand tool, such as an angle grinder, according to the preamble of
Die
Die Spannschelle ist mit einem Rastbauteil versehen, welches auf der Außenseite des Spannschellenbandes gelenkig gelagert ist und ein Rastglied aufweist, das durch eine Ausnehmung im Spannschellenband hindurchragt und in eine Verzahnung am Außenmantel des Spannhalses verrastend eingreift. Das Rastbauteil ist manuell zwischen der Rast- und der Außerrastposition zu verschwenken. Der Formschluss, welcher über das Rastbauteil eingestellt wird, verhindert ein Verdrehen der Schutzhaube am Spannhals, wodurch die Sicherheit insbesondere für den Fall eines Werkzeugbruches verbessert wird.The clamp is provided with a locking member which is articulated on the outside of the clamp band and having a locking member which protrudes through a recess in the clamp band and engages latching in a toothing on the outer surface of the clamping neck. The catch component is to be manually pivoted between the latching and the non-latching position. The positive connection, which is set via the locking component, prevents rotation of the guard on the clamping neck, whereby the safety is improved, in particular in the event of tool breakage.
Die
Der Erfindung liegt die Aufgabe zugrunde, eine Werkzeugmaschine, insbesondere eine Handwerkzeugmaschine, hinsichtlich der Befestigung ihrer Schutzhaube dahingehend zu gestalten, dass sich auch bei für den Benutzer kurzen Stellwegen ein einfacher und sicherer Aufbau realisieren lässt.The invention has for its object to make a machine tool, in particular a hand tool, with respect to the attachment of their guard to the effect that can be realized even with short travel for the user a simple and secure structure.
Diese Aufgabe wird mit den Merkmalen des Anspruches 1 erfingdungsgemäß gelöst.This object is achieved erfingdungsgemäß with the features of
Bei der erfindungsgemäßen Werkzeugmaschine wird durch das Aufschwenken des Schwenkabschnittes beim Lösen des Spannbandes nicht nur die vom Spannband erzeugte, radial auf den Spannhals wirkende Klemmkraft gelöst, sondern es ergibt sich, allein schon durch das Lösen der Klemmkraft, zugleich eine gewisse Aufweitung des Durchmessers des Spannbandes. Auch der Durchmesser des Spannbandes kann zudem mit geringem manuellem Kraftaufwand aufgeweitet werden, so dass das Spannband insgesamt, einschließlich gegebenenfalls daran angeordneter Rastelemente bzw. Rastmittel in die Löseposition gebracht werden kann. Dabei kann, bezogen auf ein Stellweg des Betätigungselementes, auf die Größe der Aufweitung im Durchmesser des Spannbandes sowie auch auf die Größe des Schwenkwinkels des Schwenkabschnittes, in mehrfacher Hinsicht Einfluss genommen werden, so beispielsweise durch die in Umfangsrichtung gegebene Länge des Schwenkabschnittes, durch die Biegeelastizität des Schwenkabschnittes des Spannbandes im Verhältnis zur Biegeelastizität des den Schwenkabschnitt tragenden Teiles des Spannbandes, durch die Materialwahl und/oder die jeweilige Querschnittsbemessung und Formgebung. Es können dadurch für den Benutzer Arbeitsverhältnisse realisiert werden, die abgestimmt auf die jeweilige Gesamtkonstruktion ein schnelles und sicheres Spannen und Lösen ermöglichen, und dies auch unter Berücksichtigung eventuell geforderter unterschiedlicher radialer Stellwege im Bereich des Schwenkabschnittes und im Bereich des den Schwenkabschnitt tragenden Teiles des Spannbandes, ungeachtet der Möglichkeit, über nur ein Betätigungselement zu spannen und gegebenenfalls auch zu verrasten.In the machine tool according to the invention not only the clamping force generated by the clamping band, radially acting on the clamping neck clamping force is achieved by the pivoting of the pivot portion, but it is, alone by releasing the clamping force, at the same time a certain expansion of the diameter of the clamping band , Also, the diameter of the clamping band can also be widened with little manual effort, so that the clamping band as a whole, including optionally arranged thereon locking elements or latching means can be brought into the release position. It can, based on a travel of the actuating element, on the size of the expansion in the diameter of the clamping band as well as on the size of the pivot angle of the pivot portion, in be influenced in several ways, such as by the given in the circumferential direction length of the pivot portion, by the bending elasticity of the pivot portion of the clamping band in relation to the bending elasticity of the pivot portion bearing portion of the clamping band, by the choice of materials and / or the respective cross-sectional design and shape. It can be realized for the user working conditions, which matched to the respective overall design a fast and safe Allow clamping and releasing, and this also taking into account possibly required different radial travel paths in the region of the pivot portion and in the region of the pivot portion carrying part of the clamping band, regardless of the possibility to stretch over only one actuator and possibly also to lock.
Gemäß einer bevorzugten Ausführungsform sind dementsprechend bevorzugt am Schwenkabschnitt, gegebenenfalls aber auch an dem diesen tragenden Teil des Spannbandes zusätzliche Rastmittel vorzusehen oder solche Rastmittel über den Schwenkabschnitt und/oder den diesen tragenden Teil des Spannbandes zu betätigen, wobei diese Rastmittel schnell und sicher in die Rastposition oder die Außerrastposition überführt werden können.According to a preferred embodiment are accordingly preferably on the pivot portion, but possibly also on the supporting part of this strap additional locking means to provide or to actuate such locking means on the pivot portion and / or this supporting part of the clamping band, said locking means quickly and safely into the locking position or the emergency stop position can be transferred.
Die Werkzeugmaschine, gegen deren Spannhals die Schutzhaube mittels des Spannbandes festzulegen ist, ist umfangsseitig am Spannhals zweckmäßigerweise mit einer in Umfangsrichtung sich erstreckenden Verzahnung versehen. Diese Verzahnung dient zum Eingriff des am Spannband, insbesondere am Schwenkabschnitt des Spannbandes vorgesehenen Rastmittels bei gespanntem Spannband. Gegebenenfalls ist am Spannhals zusätzlich eine in Umfangsrichtung sich erstreckende Nut eingebracht, die bevorzugt zur axialen Sicherung dient, indem ein Pin oder Zapfen oder dergleichen, welcher am Spannband oder an der Schutzhaube ausgebildet ist, in diese Umfangsnut eingreift. Möglich ist sowohl eine separate Ausführung der Umfangsnut und der sich in Umfangsrichtung erstreckenden Verzahnung als auch eine gekoppelte Ausführung, bei der sich die Verzahnung mit den einzelnen in Umfangsrichtung aufeinander folgenden zahnförmigen Vertiefungen unmittelbar von der Umfangsnut ausgehend in Achsrichtung erstreckt.The machine tool, against the clamping neck of the protective cover is to be determined by means of the clamping band is circumferentially provided on the clamping neck expediently with a circumferentially extending teeth. This toothing is used to engage the locking band provided on the tensioning band, in particular on the pivoting portion of the tensioning band, when the tensioning band is tensioned. Optionally, a groove extending in the circumferential direction is additionally introduced on the clamping neck, which preferably serves for axial securing by a pin or pin or the like, which is formed on the clamping band or on the guard, engages in this circumferential groove. Possible is both a separate execution of the circumferential groove and extending in the circumferential direction toothing and a coupled embodiment in which the toothing extends with the individual circumferentially successive tooth-shaped recesses starting directly from the circumferential groove in the axial direction.
Die erfindungsgemäße Schutzhaube wird für eine Werkzeugmaschine, insbesondere eine Handwerkzeugmaschine wie beispielsweise einem Winkelschleifer, verwendet, wobei die Schutzhaube ein rotierend gelagertes Werkzeug der Werkzeugmaschine übergreift und mithilfe einer Befestigungseinrichtung an einem Spannhals der Werkzeugmaschine zu befestigen ist. Die Befestigungseinrichtung weist ein um den Spannhals zu legendes Spannband auf, das mithilfe eines Betätigungselements zu spannen ist. Ein Abschnitt des um den Spannhals zu legenden Spannbandes ist als Schwenkabschnitt ausgebildet, der gegenüber einem angrenzenden Abschnitt am Spannband schwenkbeweglich gehalten ist. Mit dem Lösen des Betätigungselementes ist der Schwenkabschnitt des Spannbandes in eine radial aufgeschwenkte Position zu überführen.The protective hood according to the invention is used for a machine tool, in particular a hand-held power tool such as an angle grinder, wherein the protective cover rotates stored tool of the machine tool overlaps and attach by means of a fastening device to a clamping neck of the machine tool. The fastening device has a clamping band to be laid around the clamping neck, which is to be tensioned by means of an actuating element. A portion of the clamping collar to be laid around the clamping neck is designed as a pivoting section, which is held pivotably in relation to an adjacent section on the clamping band. With the release of the actuating element of the pivoting portion of the clamping band is to be converted into a radially pivoted position.
In bevorzugter Ausführung befindet sich auf der Innenseite des Spannbandes, insbesondere im Bereich des Schwenkabschnittes mindestens ein Rastelement, das bei gespanntem Spannband am Spannhals anliegt und vorzugsweise in eine zugeordnete Rastausnehmung auf der Außenseite des Spannhalses formschlüssig eingreift. Das sich radial nach innen erstreckende Rastelement wird mit dem Aufschwenken des Schwenkabschnittes automatisch in die Außerrastposition überführt. In Gegenrichtung wird zum Befestigen der Schutzhaube der Schwenkabschnitt aus einer aufgeschwenkten Position in eine dem Spannhals angenäherte Position verschwenkt, wodurch zugleich die Rastelemente auf der Innenseite des Schwenkabschnittes in die Rastposition gelangen.In a preferred embodiment is located on the inside of the clamping band, in particular in the region of the pivot portion at least one locking element, which rests with tensioned tensioning strap on the clamping neck and preferably engages positively in an associated recess on the outside of the clamping neck. The radially inwardly extending latching element is automatically transferred to the pivoting of the pivoting portion in the non-latching position. In the opposite direction, the pivoting portion is pivoted from a pivoted position into a position approximating the clamping neck for fastening the protective hood, whereby at the same time the locking elements on the inside of the pivoting portion reach the locking position.
Die Schwenkbarkeit des Schwenkabschnittes ist zweckmäßigerweise so weit ausgeprägt, dass die Rastelemente auf der Innenseite im aufgeschwenkten Zustand in der Außerrastposition stehen. Im gespannten Zustand, der zugleich die Rastposition markiert, nimmt dagegen der Schwenkabschnitt zweckmäßigerweise die gleiche Krümmung ein wie die angrenzenden Spannbandabschnitte, so dass das Spannband einschließlich Schwenkabschnitt Kreisform besitzt.The pivoting of the pivot portion is expediently so far pronounced that the locking elements are on the inside in the pivoted state in the non-latching position. In the tensioned state, which also marks the locking position, however, takes the pivot portion expediently the same curvature as the adjacent clamping band sections, so that the clamping band including pivot portion has a circular shape.
Gegebenenfalls befindet sich ein Rastelement an einem Abschnitt des Spannbandes außerhalb des Schwenkabschnittes. Dieses Rastelement bzw. die Rastelemente können zusätzlich oder alternativ zum Rastelement am Schwenkabschnitt vorgesehen sein. Die Überführung des Schwenkabschnittes in die aufgeschwenkte Position erfolgt durch Beaufschlagung über das Betätigungselement. Bei dem als Schraube ausgebildeten Betätigungselement liegt der Kopf oder die freie Stirnseite der Schraube an einem Bauteil des Schwenkabschnittes an und verstellt den Schwenkabschnitt entweder aktiv in die aufgeschwenkte Position oder ermöglicht ein Aufschwenken durch Federkraft, wobei im letztgenannten Fall das Betätigungselement den Schwenkabschnitt nicht aktiv in den aufgeschwenkten Zustand überführt, sondern den Schwenkabschnitt gegen die Kraft des Federelementes in der gespannten Position hält. Mit dem Überführen des Betätigungselementes in die entspannte Position wird somit entweder aktiv oder passiv der Schwenkabschnitt vom Betätigungselement in die aufgeschwenkte Position überführt.Optionally, there is a locking element on a portion of the clamping band outside the pivot portion. This locking element or the locking elements may be additionally or alternatively provided to the locking element on the pivoting portion. The transfer of the pivoting portion in the pivoted position takes place by acting on the actuating element. In the trained as a screw actuator, the head or the free end of the screw is located on a component of the pivot portion and adjusted the pivot portion either active in the pivoted position or allows pivoting by spring force, in the latter case, the actuator is not active in the swing section in the pivoted state transferred, but holds the pivot portion against the force of the spring element in the cocked position. With the transfer of the actuating element in the relaxed position is thus either actively or passively transferred the pivot portion of the actuating element in the pivoted position.
Das Bauteil am Schwenkabschnitt, welches von dem Betätigungselement beaufschlagt wird, ist erfindungsgemäß als Niederhalter ausgeführt, wobei das Betätigungselement beim Lösen den Niederhalter am Schwenkabschnitt in der Weise beaufschlagt, dass der Schwenkabschnitt in eine radial aufgeschwenkte Position überführt wird. Der Niederhalter kann sich radial nach außen am Spannband erstrecken, möglich ist aber auch eine Ausführung mit zusätzlicher tangentialer Komponente. Beim Lösen des erfindungsgemäß als Schraube ausgeführten Betätigungselementes drückt die Schraube gegen den Niederhalter und beaufschlagt dadurch den Schwenkabschnitt in die aufgeweitete Position. Gegebenenfalls ist der Schwenkabschnitt in die aufgeweitete Position federbelastet, wobei im befestigten Zustand die Schraube auf den Niederhalter wirkt und hierdurch den Schwenkabschnitt in der eingeschwenkten Position sichert. Mit dem Lösen der Schraube kann der Schwenkabschnitt unter der Wirkung der Federkraft nach außen aufschwenken. Die Federkraft wird entweder über ein separates Federelement erzeugt, welches beispielsweise im Gelenk des Schwenkabschnittes angeordnet sein kann, oder durch die Eigenspannung des Schwenkabschnittes, was beispielsweise durch eine entsprechende Prägung des den Schwenkabschnitt mit den übrigen Abschnitten des Spannbandes verbindenden Gelenkes erreicht werden kann. In diesem Fall ist das Gelenk bevorzugt nach Art eines Filmscharniers als Abschnitt mit reduzierter Wandstärke im Spannband ausgeführt oder durch eine Einprägung, die ein Aufschwenken des Schwenkabschnittes ermöglicht.The component on the pivoting portion, which is acted upon by the actuating element, according to the invention is designed as a hold-down, wherein the actuating element when releasing the hold-down acts on the pivot portion in such a manner that the pivoting portion is transferred to a radially pivoted position. The hold-down may extend radially outward on the tension band, but is also possible a version with additional tangential component. When releasing the present invention designed as a screw actuator, the screw presses against the hold-down and thereby acts on the pivoting portion in the expanded position. Optionally, the pivot portion is spring loaded in the expanded position, wherein in the fastened state, the screw acts on the hold-down and thereby secures the pivot portion in the pivoted position. With the release of the screw, the pivoting portion can swing outward under the action of the spring force. The spring force is generated either via a separate spring element, which may for example be arranged in the joint of the pivot portion, or by the residual stress of the pivot portion, which can be achieved, for example, by a corresponding embossing of the joint connecting the pivot portion with the remaining portions of the tension band. In this case, the joint is preferably designed in the manner of a film hinge as a section with reduced wall thickness in the clamping band or by an impression that allows pivoting of the pivoting portion.
Eine Schutzhaube, die als Funktionseinheit mit ihrer Befestigungseinrichtung auch ein Ersatz- und/oder Nachrüstteil bildet, lässt sich - zumindest ohne größeren Anpassungsaufwand - auch im Austausch für Schutzhauben anderer Konstruktion bei vielen Werkzeugmaschinen einsetzen.A protective hood, which also forms a replacement and / or retrofit component as a functional unit with its fastening device, can also be used in many machine tools - at least without much adaptation effort - in exchange for protective hoods of a different design.
Weiter betrifft die Erfindung auch das Spannband als solches, dass insbesondere zum Festlegen der Schutzhaube auf dem Spannhals der Werkzeugmaschine vorgesehen ist und das diese Festlegung schnell, einfach, sicher und gegebenenfalls auch verrastbar bei geringem Aufwand und bei für den Benutzer einfacher Betätigung dadurch ermöglicht, dass es einen ausschwenkbaren Umfangsabschnitt als Schwenkabschnitt aufweist, der über das Betätigungselement beaufschlagt ist und der in eine radial ausgeschwenkte Löseposition verschwenkbar ist, wobei diese Verschwenkung aktiv über das Betätigungselement oder, nach Freigabe durch das Betätigungselement auch passiv über eine Federanordnung oder dergleichen erreichbar ist.Furthermore, the invention also relates to the tension band as such that is provided in particular for fixing the guard on the clamping neck of the machine tool and this fast, easy, safe and possibly lockable with little effort and easy for the user operation allows that it has a swing-out peripheral portion as a pivot portion, which is acted upon by the actuating element and which is pivotable in a radially pivoted release position, said pivoting is actively accessible via the actuating element or, after release by the actuating element also passively via a spring arrangement or the like.
Weitere Vorteile und zweckmäßige Ausführungen sind den weiteren Ansprüchen, der Figurenbeschreibung und den Zeichnungen zu entnehmen. Es zeigen:
- Fig. 1
- in Ansicht einen Ausschnitt einer Werkzeugmaschine, auf deren Spannhals eine Schutzhaube über ihre Befestigungseinrichtung befestigt ist, wobei die Befestigungseinrichtung ein Spannband umfasst, das einen Schwenkabschnitt aufweist, welcher im gelösten Zustand des Spannbandes über ein Gelenk in eine aufgeweitete Position verschwenkt werden kann,
- Fig. 2
- eine
Fig. 1 entsprechende Darstellung, jedoch im gelösten Zustand der Befestigungseinrichtung, bei dem der Schwenkabschnitt sich in der aufgeschwenken, radial aufgeweiteten Position befindet, - Fig. 3
- eine Schutzhaube mit Befestigungseinrichtung in einer modifizierten Ausführung,
- Fig. 4
- Schutzhaube und Befestigungseinrichtung in noch einer modifizierten Ausführung,
- Fig. 5
- ein Lagerflansch der Werkzeugmashine mit einem Spannhals, in welchem ein Lager für ein Werkzeug der Werkzeugmaschine aufgenommen ist, wobei in die äußere Mantelfläche des die Schutzhaube tragenden Spannhalses eine Umfangsnut mit einer Verzahnung eingebracht ist, mit der ein Rastelement auf der Innenseite des Spannbandes in eine Rastposition zu verbringen ist,
- Fig. 6
- einer Lagerflansch ähnlich wie
Fig. 5 , jedoch mit einer getrennten, axial versetzten Ausführung von Umfangsnut und einer sich über den Umfang erstreckenden Verzahnung.
- Fig. 1
- in view of a section of a machine tool, on the clamping neck a protective hood is fastened via its fastening device, wherein the fastening device comprises a clamping band having a pivoting portion, which in dissolved Condition of the tensioning band can be pivoted about a joint in an expanded position,
- Fig. 2
- a
Fig. 1 corresponding representation, but in the released state of the fastening device, wherein the pivot portion is in the pivot, radially expanded position, - Fig. 3
- a protective hood with fastening device in a modified embodiment,
- Fig. 4
- Protective cover and fastening device in a still further modified version,
- Fig. 5
- a bearing flange of the machine tool with a clamping neck, in which a bearing for a tool of the machine tool is received, wherein in the outer circumferential surface of the guard wearing clamping neck a circumferential groove is introduced with a toothing, with a locking element on the inside of the clamping band in a detent position to spend is
- Fig. 6
- a bearing flange similar to
Fig. 5 but with a separate axially staggered circumferential groove configuration and circumferentially extending teeth.
In den Figuren sind gleiche Bauteile mit gleichen Bezugszeichen versehen.In the figures, the same components are provided with the same reference numerals.
Die Befestigungseinrichtung 5 zur Befestigung der Schutzhaube 1 am Spannhals 2 umfasst ein Spannband 6, welches als Spannschelle ausgebildet ist und über eine Schraube 10 zu spannen ist. Die Schraube 10 bildet ein Betätigungselement zum Spannen und Lösen des Spannbandes 6 und ist durch stirnseitige, radial auskragende Endabschnitte 6a und 6b des Spannbandes hindurchgeführt, die jeweils mit Ausnehmungen versehen sind, durch die die Schraube hindurchgesteckt ist. Die Schraube wird über eine Mutter am Spannband gesichert. Die Längsachse der Schraube 10 verläuft bezogen auf das Spannband 6 im geschlossenen Zustand in Tangentialrichtung.The
Das Spannband 6 weist einen Schwenkabschnitt 7 auf, der Bestandteil des Spannbandes ist und sich über ein Winkelsegment des Spannbandes erstreckt und um den Spannhals 2 der Werkzeugmaschine gelegt ist. Der Schwenkabschnitt 7 ist über ein Dreh- bzw. Schwenkgelenk 9 mit einem unmittelbar angrenzenden Abschnitt 8 des Spannbandes verbunden, wobei das Gelenk 9 eine Drehachse aufweist, die parallel zur Rotationsachse des Werkzeuges verläuft. Das Gelenk 9 erlaubt es, dass der Schwenkabschnitt 7 um das Gelenk in eine radial aufgeweitete Position aufgeschwenkt werden kann.The
In
Auf der nach innen weisenden Seite sind am Schwenkabschnitt 7 zwei radial nach innen gerichtete Rastelemente 11 angeordnet, die im gespannten Zustand des Spannbandes 6 in eine Rastposition mit zugeordneten Ausnehmungen in der Mantelfläche des Spannhalses 2 liegen. Über die Rastelemente 11 wird im gespannten Zustand des Spannbandes eine Rastsicherung erreicht, die in Umfangsrichtung wirkt und zweckmäßigerweise auch in Achsrichtung. Diese Rastsicherung verhindert, dass die Schutzhaube 1 sich am Spannhals 2 verdrehen kann und, soweit die Rastsicherung auch in Achsrichtung wirksam ist, dass die Schutzhaube 1 sich vom Spannhals in Achsrichtung lösen kann.On the inwardly facing side of the pivoting
Ein weiteres Rastelement 14 ist auf der Innenseite des Spannbandes 6 außerhalb des Schwenkabschnittes 7 angeordnet. Dieses zusätzliche Rastelement 14 dient insbesondere zur Axialsicherung am Spannhals.A further latching
Auf der außen liegenden Seite befindet sich am Schwenkabschnitt 7 benachbart zur Schraube 10 ein radial überstehender Niederhalter 12, mit dem der Kopf der Schraube 10 auf Kontakt liegt. Der Niederhalter 12 hat die Aufgabe, die Aufschwenkbewegung des Schwenkabschnittes beim Lösen der Schraube 10 zu unterstützen.On the outer side is located on the
In
Das Gelenk 9 zwischen dem Schwenkabschnitt 7 und dem angrenzenden Abschnitt 8 des Spannbandes 6 kann in einfacher mechanischer Weise dadurch hergestellt werden, dass der Endbereich des Schwenkabschnittes 7 hakenförmig umgebogen ist und einen Achszapfen umgreift, welcher am zugeordneten, stirnseitigen Ende des Abschnittes 8 gebildet bzw. angeordnet ist.The
Des Weiteren kann es zweckmäßig sein, den Schwenkabschnitt 7 durch die Kraft eines Federelementes entweder in seine Spannposition oder in seine aufgeschwenkte Position zu belasten. Das Federelement kann einteilig mit dem Spannband 6 ausgebildet sein, beispielsweise dadurch, dass das Gelenk 9 lediglich als verjüngter Wandabschnitt oder als Einprägung im Spannband ausgebildet ist und dem Schwenkabschnitt 7 eine Vorspannung aufgegeben wird. Möglich ist aber eine Ausbildung des Federelementes als separates Bauteil, das beispielsweise im Bereich des Gelenkes 9 angeordnet ist und den Schwenkabschnitt in eine seiner Endpositionen kraftbeaufschlagt.Furthermore, it may be appropriate to load the pivoting
Im Ausführungsbeispiel nach
Der Niederhalter 12 liegt am Kopf der Schraube 10 an und erstreckt sich auf der Außenseite des Schwenkabschnittes 7 mit einer radialen Komponente sowie einer Komponente in Umfangsrichtung. Die freie Stirnseite des Niederhalters 12 liegt auf dem Kopf der Schraube 10 an, so dass mit dem Lösen der Schraube 10 der Niederhalter zurückgebogen wird und hierdurch eine Kraft entsteht, die gemeinsam mit dem Abstand zum Gelenk 9 zu einem aufschwenkenden Moment führt.The hold-down 12 abuts the head of the
Das Ausführungsbeispiel gemäß
In
Die zahnförmigen Vertiefungen erstrecken sich jeweils axial von einer Umfangsnut 22 ausgehend, die sich über den gesamten Umfang des Spannhalses 2 erstreckt. Entlang der Umfangsnut 22 kann das Rastelement des Rastbauteils verschoben werden. Gegebenenfalls ragt jedoch ein vom Rastelement separat ausgebildetes Bauteil wie zum Beispiel ein Pin oder dergleichen in die Umfangsnut ein und sichert dadurch die Spannschelle sowie die Schutzhaube in Achsrichtung am Spannhals.The tooth-shaped depressions each extend axially from a
Im Ausführungsbeispiel gemäß
Claims (13)
- Power tool, in particular portable power tool, such as an angle grinder for example, having a protective hood (1) which is intended to be fastened to a clamping neck (2) of the power tool via a clamping band (6) which is intended to be placed around the clamping neck (2) and to be clamped via an actuating element (10), said clamping band having a pivoting section (7) which is acted upon by the actuating element (10) and is pivotable into a radially pivoted-out position, wherein the pivoting section (7) is held in a pivotable manner on an adjoining section (8) of the clamping band (6), wherein, during the releasing operation, the pivoting section (7) is acted upon by the actuating element (10), which is in the form of a screw (10), and is transferable into the radially pivoted-up position, characterized in that a component on the pivoting section (7) is embodied as a holding-down means (12) and is acted upon by the screw (10), wherein, during the releasing operation, the screw (10) acts upon the holding-down means (12) on the pivoting section (7) in such a way that the pivoting section (7) is transferred into a radially pivoted-up position.
- Power tool according to Claim 1,
characterized in that the clamping neck (2) of the power tool has a toothing (21) which extends in the circumferential direction and in which a latching element (11) of the pivoting section (7) engages in the latching position. - Power tool according to Claim 1 or 2,
characterized in that a circumferential groove (22) is provided on the clamping neck (2). - Power tool according to Claim 3,
characterized in that, starting from the circumferential groove (22) on the clamping neck (2), tooth-like, axially extending depressions are introduced into the lateral surface of the clamping neck (2). - Power tool according to one of Claims 1 to 4,
characterized in that at least one latching element (11) is arranged on the inner side of the pivoting section (7) on the clamping band (6), said latching element (11) resting against the clamping neck (2) when the clamping band (6) is clamped. - Power tool according to one of Claims 1 to 5,
characterized in that, during the releasing operation, the actuating element (10) acts upon the holding-down means (12) by way of a component that radially widens the pivoting section (7). - Power tool according to one of Claims 1 to 6,
characterized in that the holding-down means (12) extends radially towards the outside on the clamping band (6). - Power tool according to one of Claims 1 to 7,
characterized in that the holding-down means (12) extends with a tangential component on the clamping band (6). - Power tool according to one of Claims 1 to 8,
characterized in that the screw (10) is guided through radially widened end sections (6a, 6b) of the clamping band (6) and extends at least substantially tangentially to the clamping band (6). - Power tool according to one of Claims 1 to 8,
characterized in that the screw (10) extends radially to the clamping band (6) and, in the clamped position, connects overlapping end sections (6a, 6b) of the clamping band (6). - Power tool according to one of Claims 1 to 10,
characterized in that the pivoting section (7) is connected to the adjoining section (8) of the clamping band (6) in an articulated manner via a pivot joint (9). - Power tool according to Claim 11,
characterized in that the pivot joint (9) is in the form of a discrete component which is held on the clamping band (6). - Power tool according to Claim 11,
characterized in that the pivot joint (9) is in the form of a section having a reduced wall thickness.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008002451A DE102008002451A1 (en) | 2008-06-16 | 2008-06-16 | Machine tool, in particular hand tool |
PCT/EP2009/054789 WO2009153084A1 (en) | 2008-06-16 | 2009-04-22 | Power tool, particularly a hand-held power tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2291264A1 EP2291264A1 (en) | 2011-03-09 |
EP2291264B1 true EP2291264B1 (en) | 2014-01-15 |
Family
ID=40863507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09765664.9A Not-in-force EP2291264B1 (en) | 2008-06-16 | 2009-04-22 | Power tool, particularly a hand-held power tool |
Country Status (6)
Country | Link |
---|---|
US (1) | US20110086583A1 (en) |
EP (1) | EP2291264B1 (en) |
CN (1) | CN102066051A (en) |
DE (1) | DE102008002451A1 (en) |
RU (1) | RU2011101499A (en) |
WO (1) | WO2009153084A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008002468A1 (en) * | 2008-06-17 | 2009-12-24 | Robert Bosch Gmbh | Machine tool, in particular hand tool |
DE102011089754A1 (en) * | 2011-12-23 | 2013-06-27 | Robert Bosch Gmbh | Guard anti |
DE102011089758A1 (en) * | 2011-12-23 | 2013-06-27 | Robert Bosch Gmbh | Guard anti |
DE102012210766A1 (en) * | 2012-06-25 | 2014-01-02 | Robert Bosch Gmbh | system |
DE102012210762A1 (en) * | 2012-06-25 | 2014-01-02 | Robert Bosch Gmbh | Guard device |
WO2014047122A1 (en) * | 2012-09-18 | 2014-03-27 | Ingersoll-Rand Company | Grinding tools with guards |
DE102017002327B4 (en) * | 2016-04-11 | 2021-05-27 | Mann+Hummel Gmbh | Filter device |
JP6581725B2 (en) * | 2017-03-29 | 2019-09-25 | 日東工器株式会社 | Power tool |
CN113237298A (en) * | 2021-05-31 | 2021-08-10 | 倪叶杲 | Drying device for automobile ornaments and use method thereof |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3126488C2 (en) * | 1981-07-04 | 1983-04-21 | Fa. A. Raymond, 7850 Lörrach | Pipe clamp |
DE3708065A1 (en) * | 1987-03-12 | 1988-09-22 | Toni Messer | Pipe clip having a screw which is screwed on beforehand |
DE10259520A1 (en) * | 2002-12-19 | 2004-07-01 | Robert Bosch Gmbh | Electric hand tool |
DE10316182A1 (en) * | 2003-04-09 | 2004-10-28 | Robert Bosch Gmbh | Hand grinder with protective hood |
DE102007041840A1 (en) | 2006-11-13 | 2008-05-15 | Robert Bosch Gmbh | Hand tool with protective hood, in particular angle grinder |
-
2008
- 2008-06-16 DE DE102008002451A patent/DE102008002451A1/en not_active Withdrawn
-
2009
- 2009-04-22 US US12/997,477 patent/US20110086583A1/en not_active Abandoned
- 2009-04-22 RU RU2011101499/02A patent/RU2011101499A/en not_active Application Discontinuation
- 2009-04-22 WO PCT/EP2009/054789 patent/WO2009153084A1/en active Application Filing
- 2009-04-22 EP EP09765664.9A patent/EP2291264B1/en not_active Not-in-force
- 2009-04-22 CN CN2009801226962A patent/CN102066051A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
RU2011101499A (en) | 2012-07-27 |
WO2009153084A1 (en) | 2009-12-23 |
US20110086583A1 (en) | 2011-04-14 |
DE102008002451A1 (en) | 2009-12-17 |
CN102066051A (en) | 2011-05-18 |
EP2291264A1 (en) | 2011-03-09 |
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