EP2252430B1 - Hand-held power tool, in particular hand-guided grinding machine - Google Patents
Hand-held power tool, in particular hand-guided grinding machine Download PDFInfo
- Publication number
- EP2252430B1 EP2252430B1 EP20080872878 EP08872878A EP2252430B1 EP 2252430 B1 EP2252430 B1 EP 2252430B1 EP 20080872878 EP20080872878 EP 20080872878 EP 08872878 A EP08872878 A EP 08872878A EP 2252430 B1 EP2252430 B1 EP 2252430B1
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- EP
- European Patent Office
- Prior art keywords
- locking
- leg
- spring
- power tool
- neck
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- 230000001681 protective effect Effects 0.000 claims description 43
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims 1
- 230000000875 corresponding effect Effects 0.000 description 22
- 239000011241 protective layer Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 3
- 230000009172 bursting Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 210000002023 somite Anatomy 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/04—Protective covers for the grinding wheel
- B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
- B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
Definitions
- the invention relates to a hand tool, in particular a hand-held, preferably designed as an angle grinder grinding machine, according to the preamble of claim 1.
- a protective cover is provided which is arranged on a hub part on the bearing neck of the housing side bearing flange of the drive spindle and rotationally fixed in several rotational positions via a locking device.
- the hub part is designed as a hat-shaped metal cap, which is axially fixed to the bearing neck against this axially positively fixed.
- the locking device with effective between the hub portion and the bearing neck locking members comprises a lying between a shoulder of the bearing flange and the brim of the hat-shaped, the hub portion sheet metal cap ring body which is rotationally fixed to the bearing flange and the one against the brim and axially, ie against the brim having resiliently biased ring portion.
- This ring portion carries as a locking member a locking lug, which correspond to the side of the brim circumferentially spaced recesses as receiving locking members.
- the bolt nose bearing Ring section is provided with an actuating button, which is to lift the torsion-free locking manually to adjust the rotational position of the guard.
- the tension band is articulated at one end of a radially swing in an open position cocking lever, the connected to the other end of the clamping band via a Wellfederglied and pivoted in the clamping position via a dead center against the clamping band.
- a latching fixing a guided on a clamping neck of an angle grinder protective hood is taken from the considered in the preamble of claim 1 DE 199 14 855 A1 known.
- an axially resiliently supported to the machine housing locking member is provided in the form of a locking lug, which are assigned bead-shaped latching contours in the radially to the clamping neck radially lying back of the guard over which a respective rotational position of the guard to the machine housing is given torsionally elastic.
- the latching resistance between the respective, resiliently supported latching member and the protective contours provided in the protective contours is chosen so that on the one hand an unintentional, beyond the elastic range beyond pivoting the guard is prevented, on the other hand, the guard by hand, overcoming the given by the locking holding forces can be pivoted.
- a clamping device which has arranged in a receiving chamber of the clamping neck clamping elements.
- the receiving chamber is open radially outward against the collar surrounding the clamping collar of the protective cover, so that is to fix by tightening the preferably elastic clamping elements of the collar of the guard to the clamping neck.
- the clamping of the clamping elements takes place relative to two lying in the circumferential direction of the clamping neck in succession in the receiving chamber clamping elements via an eccentric cam lying between the clamping elements, which is pivotable via a hand lever, whereby all rotational positions of the guard fixed to the clamping neck braced, thus fixed in the direction of rotation, adjustable are.
- each desired rotational positions of the guard to the bearing neck is done manually by taking place in the direction of extension of the bearing neck acting on the guard, such that the corresponding wave pattern of the clutch discs come out of engagement due to the axial elasticity of the annular body.
- the guard is rotationally rigidly supported in their respective locked rotational position.
- the torsionally rigid support has the consequence that in case of tool damage, for example when bursting a grinding wheel and an associated wedging of disc parts against the protective hood or jamming of a workpiece between the tool and protective cover, in particular the protective cover and / or their locking can be damaged.
- the invention is based on the object, without substantial additional effort such cases of damage to avoid or at least to reduce their extent of damage and also, optionally independently thereof, to provide a particularly simple and montageeschreib favorable locking arrangement.
- the starting point for the solution according to the invention is the definition of the circumference overlapping the tool provided protective hood in a particular predetermined by the operating conditions and purpose rotary position by a respective locking arrangement.
- a respective desired position is thus predetermined for the protective hood, from which the protective hood can yield in the circumferential direction while maintaining the locking with the corresponding application of force due to the elastically yielding support.
- the elastically yielding support is provided by the locking device, in particular in an arrangement in which the protective cover is elastically supported in the driving direction of rotation of the drive spindle.
- a respective protective layer is determined by a pivoting area about a locking position, within which the protective hood is pivotable at elastically resilient support to this locking position.
- spring means in the form of a U-shaped leg spring connected via its U-shaped vertex arc has a locking leg and mounting legs, of which the mounting leg is fixed to the housing side and the locking leg provided on the side of the hub side clamping neck locking members accessing locking members carries and extends transversely to the axis of the drive spindle.
- the leg spring can be arranged in the context of the invention with transversely to the axis of the drive spindle extending spring plane or, which is another solution according to the invention, extending in the direction of the axis of the drive spindle spring plane. In both cases, by the design as a leg spring and the connection of the legs on the vertex and a compliance in the direction of extension of the legs to achieve, resulting in the elastically resilient support of the guard in a protective layer to a respective given locking position.
- the leg spring is formed as a leaf spring with in the direction of the spring plane over the vertex arc against each other, each transverse to the spring plane flat locking leg and mounting leg, which can be high clamping forces and for the elastic support high support forces to realize for the locking.
- These forces can be influenced in their height as well as in their relation to one another further by the fact that the fastening leg and the locking leg extend at an angle to one another in the direction of the spring plane, so that a tilting of the leg spring results in the area of the vertex arc.
- Such a set also has the advantage that the legs extend at an angle to each other transversely to the plane of the spring, so that a fixing leg passing through in the vicinity of the vertex arc fastening screw outside the overlapping region of the locking leg and thus is easily accessible.
- FIG. 1 and 2 are mutually corresponding representations of a power tool in the form of a hand-held grinding machine 1 shown in a side view.
- the grinding machine 1 is formed in the embodiment as an electrically driven machine and has a housing 2, which, which is not shown in a known manner receives a drive with motor and downstream gear and the axially connected at one of its ends in the embodiment with a bearing flange 3 , is screwed in the embodiment.
- Associated axial screw connections are indicated at 4.
- the bearing flange 3 is, as in Fig. 3 illustrated penetrated by a drive spindle 5, the driving direction of rotation is denoted by 38, and terminates in a bearing neck 6.
- the drive spindle 5 extends to the bearing neck 6, at least in approximation coaxially.
- the rotational and longitudinal axis in the drive spindle 5 is denoted by 7.
- the drive spindle 5 carries at the end aus convincedd, which is not shown in detail, a tool 8.
- the tool 8 is preferably in the form of a rotating grinding or cutting disc. At least over part of its circumference, the tool 8 is surrounded by a protective hood 9, which is rotatably guided on the bearing neck 6 via its hub part in the form of a clamping neck 10 and axially fixed to the bearing neck 6, which is not shown.
- the clamping collar 10 is formed by a laterally, that is, in the direction of the rotational and longitudinal axis 7 to the protective hood 9 projecting and the bearing neck 6 overlapping collar.
- the protective cover 9 is to set the rotational and longitudinal axis 7 in different rotational positions as protective layers.
- a locking arrangement 11 which in a first embodiment according to Fig. 1 to 3
- Spring means 12 which are associated with locking members 13, to which provided by the protective cover 9, the clamping neck 10 associated locking members 14 correspond.
- locking members 13 are formed as projecting tabs 15, which correspond to recesses 16 as provided on the side of the clamping neck 10 locking members 14.
- the spring means 12 are in the embodiment according to Fig. 1 to 3 designed as a U-shaped leg spring 17 with a locking leg 18, a mounting leg 19 and a connecting these legs U-shaped vertex arch 20.
- the spring plane of the U-shaped leg spring 17 extends according to their arrangement Fig.1 to 3 axially, that is to say in the longitudinal direction of the rotational and longitudinal axes 7, and thus in relation to the view according to FIG Fig. 1 and 2 parallel to the drawing plane, and based on the sectional view according to Fig. 3 perpendicular to the drawing plane.
- the tabs 15 axially engage with radial overlap in the recesses 16 in their locking position ( Fig. 1 ) and are substantially axially from the recesses 16 as shown in FIG Fig. 2 swung.
- the U-shaped leg spring 17 is preferred as in FIGS Fig. 1 to 3 illustrated, designed as a U-shaped curved leaf spring, namely at the spring plane transverse broad sides 22 and extending in the direction of the spring plane narrow sides 23, in particular from the Fig. 5 to 7 seen.
- Fig. 5 to 7 especially in Fig. 6 is also illustrated that in a plan view of the U-shaped leg spring 17 according to arrow VI in Fig. 5 the locking leg 18 and the mounting leg 19 preferably extend at an angle 24 to each other, by the in the plan view according to Fig. 5 the screw 4 associated with screw hole 25 in the mounting leg 19 at least partially, preferably at least substantially unobstructed to the locking leg 18 and thus allows a simple screwing of the spring means 12 in the form of the leg spring 17 frontally to the bearing flange 3, as is made Fig. 1 and 2 is apparent.
- leg spring 17 in the region of the vertex arc 20 also gives the possibility of an arrangement of the leg spring 17 with respect to the circumferential direction of the bearing neck 6 in opposite directions extension of locking leg 18 and mounting leg 19, wherein the locking leg 18 transverse to the rotational and longitudinal axis 7 substantially tangent to the bearing neck 6 runs and how Fig. 6 shows, in the area provided on the locking leg 18, formed by the tabs 15 locking members 13 is bulged radially outward, so that one of the peripheral contour of the clamping neck 10 corresponding contour contour of the locking leg 18 results in the locking area.
- the U-shaped leg spring 17 additionally designed to the effect that the locking leg 18 is not only resilient in the direction of the locking plane, and thus transversely to its extension, but is also connected to the mounting leg 19, that he at corresponding load of the protective cover 9 is resiliently supported in the circumferential direction in its longitudinal direction, it follows depending on the protective hood 9 supported torque corresponding to the elastically resilient support while maintaining the respective locking position in the circumferential direction shifted protective layer.
- a sector is determined as the pivoting range, over which the protective layer can change depending on the torque to be supported.
- Fig. 7 illustrates positions of the locking leg 18 of the leg spring 17 in its unassembled starting position, which is shown in solid lines.
- the dot-dashed center position of the leg spring 18 corresponds to a locking position according to Fig. 1 and a location according to Fig. 5 in which a clamping force corresponding to the pivoting path 29 is constructed.
- the Leg spring 17 is thus biased to its locking position and for displacement in the unlocked position, which is shown in dashed lines as a third position, an enlarged pivoting 30 is overcome, so possibly also with increase in torque applied to the protective cover 9 and optionally to a Actuation of the locking leg 18 leads in the direction of its unlocked position, correspondingly larger biasing forces are constructed.
- the solution according to the invention is thus characterized not only by a robust, simple construction and a sensible handling, but also by a high degree of locking security.
- both the protective hood 9 as well as the locking arrangement 11 and / or the drive spindle 5 and their storage are at least normally protected from damage, which cause a replacement of these parts and thus trigger a repair case.
- Fig. 1 to 3 Go, as described, from an arrangement of a leg spring 17 with in the longitudinal direction of the rotational and longitudinal axis 7 extending spring level.
- Fig. 4 shows in a basic construction of the Fig. 3 corresponding representation of a different arrangement of a U-shaped leg spring 31, the analogous to Fig. 1 to 3 in turn, a locking leg 32, a mounting leg 33 and a U-shaped, these legs 32, 33 connecting vertex 34 have.
- the fastening leg 32 is, as shown symbolically, supported by a screw connection 37, for example, on a support bump 35, which is provided axially projecting on the bearing flange 3.
- Deviating from the design according to Fig. 1 to 3 is the leg spring 31 in the solution according to Fig.
- the leg spring 31 is preferably a leaf spring with running in the direction of the spring plane narrow sides and transverse formed to the spring plane broad sides 22.
- the protective hood 9 can be achieved in its protective position in a respective locking position to the protective hood 9 befindaji locking arrangement by an inherently elastic design of the locking arrangement elastically yielding supported pivoting range, the elastic in itself education are achieved for example by spring means 12, as in Form of the leg springs 17 or 31 are explained vorildert.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Sawing (AREA)
- Harvester Elements (AREA)
Description
Die Erfindung betrifft eine Handwerkzeugmaschine, insbesondere eine handgeführte, bevorzugt als Winkelschleifmaschine ausgebildete Schleifmaschine, gemäß dem Oberbegriff des Anspruches 1.The invention relates to a hand tool, in particular a hand-held, preferably designed as an angle grinder grinding machine, according to the preamble of
Bei einer aus der
Das Nabenteil ist als hutförmige Blechkappe ausgebildet, die auf den Lagerhals axial aufgeschoben gegen diesen axial formschlüssig festgelegt ist.The hub part is designed as a hat-shaped metal cap, which is axially fixed to the bearing neck against this axially positively fixed.
Die Verriegelungsvorrichtung mit zwischen dem Nabenteil und dem Lagerhals wirksamen Verriegelungsgliedern umfasst einen zwischen einer Schulter des Lagerflansches und der Krempe der hutförmigen, das Nabenteil bildenden Blechkappe liegenden Ringkörper, der zum Lagerflansch drehfixiert ist und der einen gegen die Krempe ausgebogenen und axial, also gegen die Krempe federnd vorgespannten Ringabschnitt aufweist. Dieser Ringabschnitt trägt als Verriegelungsglied eine Riegelnase, der seitens der Krempe in Umfangsrichtung beabstandete Ausnehmungen als aufnehmende Verriegelungsglieder entsprechen. Der die Riegelnase tragende Ringabschnitt ist mit einer Betätigungstaste versehen, über die zur Verstellung der Drehlage der Schutzhaube deren drehstarre Verriegelung manuell aufzuheben ist.The locking device with effective between the hub portion and the bearing neck locking members comprises a lying between a shoulder of the bearing flange and the brim of the hat-shaped, the hub portion sheet metal cap ring body which is rotationally fixed to the bearing flange and the one against the brim and axially, ie against the brim having resiliently biased ring portion. This ring portion carries as a locking member a locking lug, which correspond to the side of the brim circumferentially spaced recesses as receiving locking members. The bolt nose bearing Ring section is provided with an actuating button, which is to lift the torsion-free locking manually to adjust the rotational position of the guard.
Bei einer weiteren, aus der
Auch bei einer aus der
Eine verrastende Fixierung einer auf einem Spannhals eines Winkelschleifers geführt abgestützten Schutzhaube ist aus der im Oberbegriff des Anspruches 1 berücksichtigten
Zur Sicherung der jeweils gewählten Drehlage der Schutzhaube eines Winkelschleifers gegenüber dessen Spannhals sieht die
Zur Abstützung einer Schutzhaube auf dem Lagerhals eines Winkelschleifers und zur Festlegung der Drehstellung der Schutzhaube ist es aus der
Bei all diesen Lösungen ist die Schutzhaube in ihrer jeweils verriegelten Drehstellung drehstarr abgestützt.In all these solutions, the guard is rotationally rigidly supported in their respective locked rotational position.
Die drehstarre Abstützung hat zur Folge, dass bei Werkzeugschäden, zum Beispiel beim Platzen einer Schleifscheibe und einem damit verbundenen Verkeilen von Scheibenteilen gegen die Schutzhaube oder beim Verklemmen eines Werkteiles zwischen Werkzeug und Schutzhaube, insbesondere die Schutzhaube und/oder deren Verriegelung beschädigt werden kann.The torsionally rigid support has the consequence that in case of tool damage, for example when bursting a grinding wheel and an associated wedging of disc parts against the protective hood or jamming of a workpiece between the tool and protective cover, in particular the protective cover and / or their locking can be damaged.
Der Erfindung liegt die Aufgabe zugrunde, ohne wesentlichen Zusatzaufwand derartige Schadensfälle zu vermeiden oder in ihrem Schadensumfang zumindest zu reduzieren sowie auch, gegebenenfalls unabhängig hiervon, eine besonders einfache und montagemäßig günstige Verriegelungsanordnung zu schaffen.The invention is based on the object, without substantial additional effort such cases of damage to avoid or at least to reduce their extent of damage and also, optionally independently thereof, to provide a particularly simple and montageemäßig favorable locking arrangement.
Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Anspruches 1 gelöst. Die Unteransprüche geben zweckmäßige Weiterbildungen und hinsichtlich der Ausgestaltung der Verriegelungsanordnung auch eigenständige Ausbildungen an.This object is achieved with the features of
Ausgangspunkt für die erfindungsgemäße Lösung ist die Festlegung der umfangsseitig überdeckend zum Werkzeug vorgesehenen Schutzhaube in einer insbesondere durch Einsatzbedingungen und Arbeitszweck vorgegebenen Drehstellung durch eine jeweilige Verriegelungsanordnung. Über diese Verriegelungsanordnung wird für die Schutzhaube somit eine jeweilige Solllage vorgegeben, aus der die Schutzhaube unter Aufrechterhaltung der Verriegelung bei entsprechender Krafteinwirkung aufgrund der elastisch nachgiebigen Abstützung in Umfangsrichtung ausweichen kann. Die elastisch nachgiebige Abstützung wird seitens der Verriegelungsvorrichtung vorgesehen, insbesondere in einer Anordnung, bei der die Schutzhaube in Antriebsdrehrichtung der Antriebsspindel elastisch abgestützt ist. Für die Schutzhaube ist somit eine jeweilige Schutzlage durch einen Schwenkbereich um eine Verriegelungsstellung bestimmt, innerhalb dessen die Schutzhaube bei elastisch nachgiebiger Abstützung auf diese Verriegelungsstellung verschwenkbar ist.The starting point for the solution according to the invention is the definition of the circumference overlapping the tool provided protective hood in a particular predetermined by the operating conditions and purpose rotary position by a respective locking arrangement. By means of this locking arrangement, a respective desired position is thus predetermined for the protective hood, from which the protective hood can yield in the circumferential direction while maintaining the locking with the corresponding application of force due to the elastically yielding support. The elastically yielding support is provided by the locking device, in particular in an arrangement in which the protective cover is elastically supported in the driving direction of rotation of the drive spindle. For the protective hood thus a respective protective layer is determined by a pivoting area about a locking position, within which the protective hood is pivotable at elastically resilient support to this locking position.
Hierzu ergibt sich ein besonders einfacher und zweckmäßiger Aufbau durch die elastisch nachgiebige Abstützung der Schutzhaube über die Federmittel in Umfangsrichtung des Lagerhalses in ihrer jeweiligen Verriegelungsstellung durch die Vorspannung die Verriegelungsglieder der Verriegelungsvorrichtung auf ihre Eingriffsstellung.This results in a particularly simple and expedient construction by the elastically yielding support of the guard on the spring means in the circumferential direction of the bearing neck in their respective locking position by the bias of the locking members of the locking device to its engaged position.
Dies lässt sich besonders einfach mit Federmitteln in Form einer U-förmig gebogenen Schenkelfeder erreichen, die über ihren U-förmigen Scheitelbogen verbunden einen Verriegelungsschenkel und Befestigungsschenkel aufweist, von denen der Befestigungsschenkel gehäuseseitig festgelegt ist und der Verriegelungsschenkel auf Seiten des nabenseitigen Spannhalses vorgesehene Verriegelungsglieder zugreifende Verriegelungsglieder trägt und sich quer zur Achse der Antriebsspindel erstreckt.This is particularly easy to achieve with spring means in the form of a U-shaped leg spring connected via its U-shaped vertex arc has a locking leg and mounting legs, of which the mounting leg is fixed to the housing side and the locking leg provided on the side of the hub side clamping neck locking members accessing locking members carries and extends transversely to the axis of the drive spindle.
Die Schenkelfeder kann im Rahmen der Erfindung mit quer zur Achse der Antriebsspindel verlaufender Federebene oder, was eine weitere erfindungsgemäße Lösung darstellt, mit in Richtung der Achse der Antriebsspindel verlaufender Federebene angeordnet sein. In beiden Fällen ist durch die Gestaltung als Schenkelfeder und die Verbindung der Schenkel über den Scheitelbogen auch eine Nachgiebigkeit in Erstreckungsrichtung der Schenkel zu erreichen, aus der die elastisch nachgiebige Abstützung der Schutzhaube in einer Schutzlage zu einer jeweils gegebenen Verriegelungsstellung resultiert.The leg spring can be arranged in the context of the invention with transversely to the axis of the drive spindle extending spring plane or, which is another solution according to the invention, extending in the direction of the axis of the drive spindle spring plane. In both cases, by the design as a leg spring and the connection of the legs on the vertex and a compliance in the direction of extension of the legs to achieve, resulting in the elastically resilient support of the guard in a protective layer to a respective given locking position.
Zweckmäßigerweise ist die Schenkelfeder als Blattfeder mit in Richtung der Federebene über den Scheitelbogen gegeneinander verschwenkbaren, jeweils quer zur Federebene flächigem Verriegelungsschenkel und Befestigungsschenkel ausgebildet, wodurch sich für die Verriegelung hohe Spannkräfte und für die elastische Abstützung hohe Stützkräfte realisieren lassen. Beeinflussen lassen sich diese Kräfte in ihrer Höhe wie auch in ihrem Verhältnis zueinander ferner dadurch, dass der Befestigungsschenkel und der Verriegelungsschenkel sich in Richtung der Federebene gesehen winklig zueinander erstrecken, so dass sich eine Schränkung der Schenkelfeder im Bereich des Scheitelbogens ergibt. Eine solche Schränkung hat ferner auch den Vorteil, dass die Schenkel quer zur Federebene winkelversetzt zueinander verlaufen, so dass eine den Befestigungsschenkel im Nahbereich zum Scheitelbogen durchsetzende Befestigungsschraube außerhalb des Überdeckungsbereiches des Verriegelungsschenkels liegt und somit gut zugänglich ist.Conveniently, the leg spring is formed as a leaf spring with in the direction of the spring plane over the vertex arc against each other, each transverse to the spring plane flat locking leg and mounting leg, which can be high clamping forces and for the elastic support high support forces to realize for the locking. These forces can be influenced in their height as well as in their relation to one another further by the fact that the fastening leg and the locking leg extend at an angle to one another in the direction of the spring plane, so that a tilting of the leg spring results in the area of the vertex arc. Such a set also has the advantage that the legs extend at an angle to each other transversely to the plane of the spring, so that a fixing leg passing through in the vicinity of the vertex arc fastening screw outside the overlapping region of the locking leg and thus is easily accessible.
Weitere Vorteile und zweckmäßige Ausführungen sind den weiteren Ansprüchen, der Figurenbeschreibung und den Zeichnungen zu entnehmen. Es zeigen:
- Fig. 1
- eine schematisierte Draufsicht auf eine Handwerkzeugmaschine in Form einer handgeführten Schleifmaschine bei zur Zeichenebene parallel verlaufender, ein Werkzeug, bevorzugt in Form einer Schleif- oder Trennscheibe, tragender Antriebsspindel und zur Antriebsspindel umschließendem Lagerhals, auf dem eine Schutzhaube drehbar angeordnet ist, die über eine Verriegelungsanordnung, welche sich in ihrer Verriegelungsstellung befindet, in einer dargestellten Schutzlage abgestützt ist,
- Fig. 2
- eine der
Fig. 1 entsprechende Darstellung, bei der die Verriegelungsanordnung in ihrer Entriegelungsstellung gezeigt ist, - Fig. 3
- eine schematisierte Darstellung entsprechend einer Schnittführung III-III in
Fig. 1 , wobei die Verriegelungsanordnung Federmittel umfasst, deren Federebene quer, insbesondere senkrecht zur Zeichenebene, somit etwa in Längsrichtung der Achse der Antriebsspindel, also axial verläuft, - Fig. 4
- eine der
Fig. 3 entsprechende Grunddarstellung, bei der im Gegensatz zuFig. 3 Federmittel gezeigt sind, deren Federebene längs der Zeichenebene, insbesondere parallel zur Zeichenebene und somit quer, insbesondere radial zur Achse der Antriebsspindel verläuft, und - Fig. 5
bis 7 - separate Darstellungen der in
Fig. 1 veranschaulichten Federmittel, die in Form einer Schenkelfeder ausgebildet sind, die einen Verriegelungsschenkel und einen Befestigungsschenkel aufweist, wobeibis 3Fig. 5 entsprechend der Darstellung gemäßFig. 1 die Schenkelfeder in Seitenansicht quer zur Federebene und in einer ihrer Verriegelungsstellung entsprechenden Federstellung undFig. 6 die Schenkelfeder gemäßFig. 5 in Blickrichtung gemäß Pfeil VI darstellt und wobeiFig. 7 in einer Seitenansicht gemäßFig. 5 verschiedene Federstellungen der Schenkelfeder veranschaulicht, in denen die Schenkelfeder zunächst in Volllinien in ihrer ungespannten Grundform gezeigt ist, darauf folgend - strichpunktiert - in Richtung ihrer Spannebene versetzt und vorgespannt, in einer derFig. 1 entsprechenden Verriegelungsstellung und schließlich, darauf folgend, strichliert in einer derFig. 2 entsprechenden Entriegelungsstellung, in der der Verriegelungsschenkel weiter ausgeschwenkt und dementsprechend stärker vorgespannt ist.
- Fig. 1
- 1 is a schematic plan view of a hand tool in the form of a hand-held grinding machine with a parallel to the drawing plane, a tool, preferably in the form of a grinding or cutting disc, carrying drive spindle and the drive spindle enclosing bearing neck, on which a protective cover is rotatably mounted, via a locking arrangement, which is in its locking position, is supported in a protective layer shown,
- Fig. 2
- one of the
Fig. 1 corresponding representation in which the locking arrangement is shown in its unlocked position, - Fig. 3
- a schematic representation corresponding to a section III-III in
Fig. 1 in which the locking arrangement comprises spring means whose spring plane is transverse, in particular perpendicular to the plane of the drawing, thus approximately in the longitudinal direction of the axis of the drive spindle, that is to say axially, - Fig. 4
- one of the
Fig. 3 corresponding basic representation, in contrast toFig. 3 Spring means are shown, the spring plane along the plane, in particular parallel to the plane and thus transverse, in particular extends radially to the axis of the drive spindle, and - Fig. 5 to 7
- separate representations of in
Fig. 1 to 3 illustrated spring means which are formed in the form of a leg spring having a locking leg and a mounting leg, whereinFig. 5 as shown in FIGFig. 1 the leg spring in side view transversely to the spring plane and in one of their locking position corresponding spring position andFig. 6 the leg spring according toFig. 5 in the direction indicated by arrow VI and whereFig. 7 in a side view according toFig. 5 illustrates different spring positions of the leg spring, in which the leg spring is first shown in solid lines in their unstretched basic shape, subsequently - dash-dotted - offset in the direction of its clamping plane and biased in one ofFig. 1 corresponding locking position and finally, subsequently, dashed in one ofFig. 2 corresponding unlocking position, in which the locking leg is further swung and accordingly biased stronger.
In den
Der Lagerflansch 3 ist, wie in
Der Spannhals 10 ist durch einen seitlich, das heißt in Richtung der Dreh- und Längsachse 7 zur Schutzhaube 9 auskragenden und zum Lagerhals 6 überlappenden Bund gebildet.The clamping
Entsprechend den Arbeitserfordernissen ist die Schutzhaube 9 zur Dreh- und Längsachse 7 in verschiedenen Drehstellungen als Schutzlagen festzulegen.According to the work requirements, the
Hierzu dient eine Verriegelungsanordnung 11, die in einer ersten Ausgestaltungsform gemäß
Die Federmittel 12 sind im Ausführungsbeispiel gemäß
In entsprechender Weise greifen die Laschen 15 bei radialer Überlappung axial in die Ausnehmungen 16 in ihrer Verriegelungsstellung ein (
Erreicht wird dies dadurch, dass bei im Wesentlichen U-förmig verbundenem Verriegelungsschenkel 18 und Befestigungsschenkel 19 diese in Achsrichtung versetzt über den sich in Achsrichtung erstreckenden Scheitelbogen 20 verbunden sind, so dass die Schenkel 18, 19 gegeneinander, und dadurch auch die zum freien Ende des Verriegelungsschenkels 18 endseitig auslaufend vorgesehene Handhabe 21, um eine durch den Scheitelbogen 20 bestimmte imaginäre Schwenkachse verschwenkbar sind.This is achieved by the fact that in substantially U-shaped connected locking
Die U-förmige Schenkelfeder 17 ist bevorzugt, wie in den
In den
Eine über den Befestigungsschenkel 19 und den U-förmigen Scheitelbogen 20 quer zur Dreh- und Längsachse 7 im Wesentlichen unnachgiebige Abstützung des Verriegelungsschenkels 18 hätte zur Folge, dass in Verriegelungsstellung die Schutzhaube 9 drehfest, das heißt in Umfangsrichtung des Lagerhalses 6 in ihrer jeweiligen Drehstellung drehfest fixiert wäre.An over the mounting
Eine solche Abstützung der Schutzhaube 9 über die Schenkelfeder 17 in ihrer geschilderten Ausbildung ist zwar gegenüber bekannten Lösungen durchaus vorteilhaft, da sie unter Montage- und Gestaltungsgesichtspunkten mit einfachen Mitteln, und damit preisgünstig eine Grundeinstellung der Schutzhaube 9 in verschiedenen Verriegelungsstellungen ermöglicht, und dies allein aufgrund der federnden Nachgiebigkeit des Verriegelungsschenkels 18 in Richtung der in
Wird im Rahmen der erfindungsgemäßen Lösung die U-förmige Schenkelfeder 17 zusätzlich dahingehend ausgestaltet, dass der Verriegelungsschenkel 18 nicht nur in Richtung der Verriegelungsebene, und damit quer zu seiner Erstreckung federnd nachgiebig ist, sondern zusätzlich derart mit dem Befestigungsschenkel 19 verbunden ist, dass er bei entsprechender Belastung der Schutzhaube 9 in Umfangsrichtung in seiner Längsrichtung nachgiebig abgestützt ist, so ergibt sich je nach auf die Schutzhaube 9 abgestütztem Drehmoment eine entsprechend der elastisch nachgiebigen Abstützung unter Beibehaltung der jeweiligen Verriegelungsstellung in Umfangsrichtung verlagerte Schutzlage. Es wird mit anderen Worten bezogen auf eine jeweilige Verriegelungsstellung durch die elastisch nachgiebige Abstützung ein Sektor als Schwenkbereich bestimmt, über dem sich die Schutzlage in Abhängigkeit vom abzustützenden Drehmoment verändern kann.Is in the context of the inventive solution, the
Die in ihrer Schutzlage in Drehrichtung elastisch nachgiebige Abstützung der Schutzhaube 9 in einer, oder bezogen auf eine jeweilige Verriegelungsstellung wird bei der vorgeschilderten Gestaltung durch eine entsprechende Nachgiebigkeit der Federmittel 12, also der Schenkelfeder 17, erreicht, die ihrerseits über den Befestigungsschenkel 19 starr zum Lagerflansch 3, und damit auch zum Lagerhals 6, festgelegt ist. Ein entsprechender Effekt lässt sich im Rahmen der Erfindung zumindest teilweise, oder auch ergänzend dadurch realisieren, dass der Befestigungsschenkel 19 statt der starren Schraubverbindung 4 über eine elastische Verbindung zum Lagerflansch 3 oder einem anderen gehäusefesten Teil festgelegt ist.The in their protective layer in the direction of rotation elastically yielding support the
Im Hinblick auf die nachgiebige Abstützung des Verriegelungsschenkels 18 in Richtung der Federebene und/oder im Hinblick auf die durch eine jeweilige Verriegelungsstellung der Verriegelungsanordnung 11 vorgegebene Ausgangslage für eine zu dieser Ausgangslage durch in Drehrichtung elastisch nachgiebige Abstützung der Schutzhaube 9 erreichbare Schutzlage erweist es sich als zweckmäßig, die Schenkelfeder 17 im Bereich ihres U-förmigen Scheitelbogens 20 und/oder des oder der davon ausgehenden Bereiche des Verriegelungsschenkels 18 und/oder des Befestigungsschenkels 19 über ihrem Querschnitt zu verändern, wobei eine bevorzugte Lösung in
Die erfindungsgemäße Lösung zeichnet sich somit nicht nur durch einen robusten, einfachen Aufbau und eine sinnfällige Handhabung aus, sondern auch durch große Verriegelungssicherheit.The solution according to the invention is thus characterized not only by a robust, simple construction and a sensible handling, but also by a high degree of locking security.
Insbesondere ist durch die erfindungsgemäße Gestaltung auch gewährleistet, dass auch bei schlagartig auftretenden Drehmomentbelastungen, die sich zum Beispiel beim Bersten von Schleif- und/oder Trennscheiben und Verklemmen von Scheibenteilen, Scheibenbruchstücken und/oder sonstigen Gegenständen zwischen Antriebsspindel 5 und Schutzhaube 9 ergeben können, sowohl die Schutzhaube 9 wie auch die Verriegelungsanordnung 11 und/oder die Antriebsspindel 5 sowie deren Lagerung zumindest im Regelfall vor Beschädigungen geschützt sind, die ein Auswechseln dieser Teile bedingen und damit einen Reparaturfall auslösen.In particular, it is also ensured by the design according to the invention that even with abruptly occurring torque loads, which can result, for example, when bursting grinding and / or cutting discs and jamming of disc parts, disc fragments and / or other objects between
Die
Funktional sind bei Berücksichtigung der Unterschiede zwischen radialem und axialem Zugriff der Verriegelungsglieder 13 auf den Spannhals 10 einander weitgehend entsprechende Verhältnisse gegeben, denen zusätzlich durch konstruktive Anpassungen in einfacher Weise Rechnung getragen werden kann, so dass für die beiden in den
Durch die Erfindung werden somit mehrere Lösungen aufgezeigt, für die Schutzhaube 9 in ihrer Schutzlage einen durch elastische Nachgiebigkeit bestimmten Schwenkbereich vorzugeben. Dies einmal dadurch, dass die Schutzhaube in ihrer Schutzlage zu einer in einer jeweiligen Verriegelungsstellung befindlichen Verriegelungsanordnung einen elastisch nachgiebigen Schwenkbereich aufweist, sei es durch eine drehelastische Abstützung zwischen den Verriegelungsgliedern oder eine nachgeordnet im Übergang auf die Schutzhaube 9 liegende drehelastische Verbindung. In einer weiteren Ausgestaltung kann für die Schutzhaube 9 in ihrer Schutzlage bei in einer jeweiligen Verriegelungsstellung zur Schutzhaube 9 befindlicher Verriegelungsanordnung 11 durch gehäuseseitig elastische Anbringung der Verriegelungsanordnung 11 ein elastisch nachgiebiger Schwenkbereich geschaffen werden. Schließlich kann erfindungsgemäß die Schutzhaube 9 in ihrer Schutzlage bei in einer jeweiligen Verriegelungsstellung zur Schutzhaube 9 befindlicher Verriegelungsanordnung durch eine in sich elastische Ausbildung der Verriegelungsanordnung ein elastisch nachgiebig abgestützter Schwenkbereich erreicht werden, wobei die in sich elastische Ausbildung beispielsweise durch Federmittel 12 erreicht werden, wie sie in Form der Schenkelfedern 17 oder 31 vorgeschildert erläutert sind.Thus, several solutions are shown by the invention, to specify for the
Claims (7)
- Portable power tool, in particular hand-held sanding machine (1), having a tool (8) that is carried via a drive spindle (5), and a protective hood (9) that at least partially covers the tool (8), is arranged in a rotatable manner on a bearing neck (6) and has at least one protective position in the direction of rotation towards the bearing neck (6), said protective position being defined by a respective locking position of a locking arrangement (11), wherein the protective hood (9) is supported via the locking arrangement (11) in a torsionally elastically resilient manner in its protective position, corresponding to the respective locking position, relative to the bearing neck (6), with locking being maintained in the circumferential direction, and wherein the locking arrangement (11) has fixing locking members (13, 14), the one locking member (13) of which is pretensioned in the direction of its manually reversible locking position with respect to the other locking member (14) via spring means (12), wherein the locking members (13), provided on the side of the spring means (12), of the locking arrangement (11) are pretensioned towards their locking position, characterized in that the locking arrangement has locking members (13, 14) that fix with respect to a clamping neck (10) of the protective hood (9), and in that the spring means (12) are formed by a leg spring (17, 31) which is formed in a manner curved in a U shape and has a locking leg (18, 32) that is resiliently pretensioned with respect to the clamping neck (10), said locking leg (18, 32) carrying the locking members (13) that engage with the locking members (14) provided on the side of the clamping neck (10) and having a fastening leg (19, 33) that is angled with respect to the locking leg (18, 32), said fastening leg (19, 33), starting from the U-shaped apex curve (20, 34) of the leg spring (17, 31), being fixed on the housing side.
- Portable power tool according to Claim 1, characterized in that the leg spring (31) has a spring plane extending transversely to the axis (7) of the drive spindle (5).
- Portable power tool according to Claim 1, characterized in that the leg spring (17) has a spring plane extending in the direction of the axis (7) of the drive spindle (5).
- Portable power tool according to Claim 2 or 3, characterized in that the locking members (13) provided on the locking leg (18, 32) are provided as projecting tabs (15).
- Portable power tool according to one of Claims 1 to 4, characterized in that the leg spring (17, 31) is configured as a leaf spring having broadsides of locking leg (18, 32) and fastening leg (19, 33) that are pivotable with respect to one another in the direction of the spring plane via the U-shaped apex curve (20, 34) and are each located transversely to the spring plane.
- Portable power tool according to Claim 5, characterized in that the fastening leg (19, 33) and the locking leg (18, 32) extend at an angle to one another as seen in the direction of the spring plane.
- Portable power tool according to Claim 6, characterized in that the leg spring (17, 31) is put crosswise in the region of the U-shaped apex curve (20, 34).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008010977A DE102008010977A1 (en) | 2008-02-25 | 2008-02-25 | Hand tool, in particular hand-guided grinding machine |
PCT/EP2008/065379 WO2009106163A1 (en) | 2008-02-25 | 2008-11-12 | Hand-held power tool, in particular hand-guided grinding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2252430A1 EP2252430A1 (en) | 2010-11-24 |
EP2252430B1 true EP2252430B1 (en) | 2015-04-29 |
Family
ID=40373544
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20080872878 Active EP2252430B1 (en) | 2008-02-25 | 2008-11-12 | Hand-held power tool, in particular hand-guided grinding machine |
Country Status (6)
Country | Link |
---|---|
US (1) | US8512104B2 (en) |
EP (1) | EP2252430B1 (en) |
CN (1) | CN101959646B (en) |
DE (1) | DE102008010977A1 (en) |
RU (1) | RU2495740C2 (en) |
WO (1) | WO2009106163A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012240127A (en) * | 2011-05-16 | 2012-12-10 | Makita Corp | Grinder |
US9120202B2 (en) | 2011-06-30 | 2015-09-01 | Black & Decker Inc. | Shield assembly for a power tool |
DE102012112621A1 (en) | 2012-12-19 | 2014-06-26 | C. & E. Fein Gmbh | Hand tool e.g. angle grinder, has fuse elements cooperated together at actuator and clamping portion in each working position by positively locking protective cover at spindle neck movable in axial retaining element on spindle neck |
CN103551952B (en) * | 2013-10-19 | 2015-10-21 | 沈阳黎明航空发动机(集团)有限责任公司 | The sanding apparatus of gas-turbine unit high-pressure turbine guider outer shroud block coating |
US11338426B2 (en) | 2015-11-02 | 2022-05-24 | Black & Decker, Inc. | Cordless power cutter |
EP3251791B1 (en) | 2016-05-06 | 2019-03-27 | Black & Decker Inc. | Reversible lever for a guard assembly for a power tool |
US10307886B2 (en) * | 2017-03-17 | 2019-06-04 | G.A.W. Inc. | Guard and control apparatus for safe operation of a rotary cutter |
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US3969856A (en) * | 1973-09-25 | 1976-07-20 | Andreas Stihl Maschinenfabrik | Adjustable protective hood for a rotary tool |
DE3805991A1 (en) * | 1987-07-20 | 1989-02-02 | Festo Kg | PLATE GRINDING MACHINE |
DE4021510A1 (en) * | 1990-07-05 | 1992-01-09 | Bosch Gmbh Robert | CLAMPING DEVICE FOR CLAMPING A PROTECTIVE HOOD ON THE CLAMP NECK OF A HAND MACHINE TOOL |
DE4113641A1 (en) | 1991-04-26 | 1992-10-29 | Bosch Gmbh Robert | HAND MACHINE TOOL |
US5140754A (en) * | 1991-09-24 | 1992-08-25 | Textron Inc. | Power tool protective hood positioning system and method of manufacturing the same |
SE9201990L (en) * | 1992-06-29 | 1993-12-30 | Atlas Copco Tools Ab | Pneumatic rotary grinder |
DE4344571A1 (en) | 1993-12-24 | 1995-06-29 | Bosch Gmbh Robert | Electric hand tool with safety shield |
SE506590C2 (en) * | 1996-05-13 | 1998-01-19 | Electrolux Ab | Explosion protection for circular tool |
SE507264C2 (en) * | 1996-06-13 | 1998-05-04 | Atlas Copco Tools Ab | Handheld power tool |
US5713785A (en) * | 1997-01-17 | 1998-02-03 | Linax Co., Ltd. | Vacuum type portable sander |
RU2152862C2 (en) * | 1998-08-10 | 2000-07-20 | Закрытое Акционерное Общество "Энерпред" | Hand-grinding machine |
DE19914855B4 (en) * | 1999-04-01 | 2004-04-22 | Metabowerke Gmbh | Hand grinder with a protective hood that can be adjusted in the circumferential direction |
DE10000701A1 (en) * | 2000-01-10 | 2001-07-12 | Bosch Gmbh Robert | Angle grinder protection hood |
DE10110119A1 (en) * | 2001-03-02 | 2002-09-12 | Bosch Gmbh Robert | Hand tool |
DE10124439A1 (en) * | 2001-05-18 | 2002-11-21 | Bosch Gmbh Robert | Protective hood of an electric angle grinder has an expanding clamp band held around a shaped housing collar about which it may be turned and clamped |
CN2557286Y (en) * | 2002-07-30 | 2003-06-25 | 阿特拉斯·科普柯长春电动工具有限公司 | Universal directional grinding machine |
DE10259520A1 (en) * | 2002-12-19 | 2004-07-01 | Robert Bosch Gmbh | Electric hand tool |
SE525836C2 (en) * | 2003-03-31 | 2005-05-10 | Atlas Copco Tools Ab | Grinding machine with explosion protection and spindle lock |
DE10336873B4 (en) * | 2003-08-11 | 2007-09-20 | Hilti Ag | Guard assembly |
DE10343060A1 (en) * | 2003-09-16 | 2005-04-07 | Robert Bosch Gmbh | Protective cowl for hand power tool especially for angle grinder has an adjustable fitting with a finger pressure ratchet lever engaging ratchet holes in cowl mounting |
DE10348395A1 (en) * | 2003-10-17 | 2005-05-19 | Robert Bosch Gmbh | Protective cover for a power tool, power tool and system with protective hood and power tool |
RU60934U1 (en) * | 2006-09-18 | 2007-02-10 | Открытое акционерное общество "Научно-исследовательский институт полупроводникового машиностроения" ОАО "НИИПМ" | GLASS PACKING SLIDING DEVICE |
-
2008
- 2008-02-25 DE DE102008010977A patent/DE102008010977A1/en not_active Withdrawn
- 2008-11-12 RU RU2010139286/02A patent/RU2495740C2/en not_active IP Right Cessation
- 2008-11-12 CN CN200880127453.3A patent/CN101959646B/en active Active
- 2008-11-12 EP EP20080872878 patent/EP2252430B1/en active Active
- 2008-11-12 WO PCT/EP2008/065379 patent/WO2009106163A1/en active Application Filing
- 2008-11-12 US US12/866,957 patent/US8512104B2/en active Active
Also Published As
Publication number | Publication date |
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EP2252430A1 (en) | 2010-11-24 |
US8512104B2 (en) | 2013-08-20 |
RU2010139286A (en) | 2012-04-10 |
CN101959646B (en) | 2016-03-23 |
US20100323595A1 (en) | 2010-12-23 |
DE102008010977A1 (en) | 2009-08-27 |
WO2009106163A1 (en) | 2009-09-03 |
RU2495740C2 (en) | 2013-10-20 |
CN101959646A (en) | 2011-01-26 |
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