EP2252430B1 - Hand-held power tool, in particular hand-guided grinding machine - Google Patents

Hand-held power tool, in particular hand-guided grinding machine Download PDF

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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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EP20080872878
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German (de)
French (fr)
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EP2252430A1 (en
Inventor
Attila Nagy
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2252430A1 publication Critical patent/EP2252430A1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00Safety 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
    • B24B55/04Protective covers for the grinding wheel
    • B24B55/05Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02Portable 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 claim 1.

Stand der TechnikState of the art

Bei einer aus der EP 0 583 270 B1 bekannten, als handgeführter Winkelschleifer ausgebildeten Handwerkzeugmaschine ist für das von einer Antriebsspindel getragene Werkzeug eine Schutzhaube vorgesehen, die über ein Nabenteil auf dem Lagerhals des gehäuseseitigen Lagerflansches der Antriebsspindel angeordnet und in mehreren Drehlagen über eine Verriegelungsvorrichtung drehstarr zu fixieren ist.At one of the EP 0 583 270 B1 known hand tool designed as handheld angle grinder hand tool for the tool carried by a drive spindle, 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.

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 DE 37 44 218 A1 bekannten Verriegelungsvorrichtung für eine auf dem Lagerhals der Antriebsspindel einer Winkelschleifmaschine drehbar abgestützte Schutzhaube erfolgt der verriegelnde Zugriff nicht axial, sondern radial und in einer Ausführung über einen zweiarmigen Hebel, der gehäuseseitig über eine zur Achse der Arbeitsspindel parallele Schwenkachse angelenkt ist. Der Schwenkhebel ist an seinem einen Ende mit einem Verriegelungsglied in Form einer Riegelnase versehen, der an einem zum Lagerhals umschließenden Nabenteil der Schutzhaube, umfangsseitig und in Umfangsrichtung beabstandet, radiale Ausnehmungen zugeordnet sind. Der andere Arm des Kipphebels dient als Betätigungstaste und ist in der der Eingriffsrichtung der Riegelnase in die jeweilige Aufnahme entsprechenden Schwenkrichtung federbelastet.At another, from the DE 37 44 218 A1 known locking device for a rotatably supported on the bearing neck of the drive spindle of an angle grinder protective hood locking access is not axially, but radially and in a version of a two-armed lever, which is hinged on the housing side via a parallel to the axis of the work spindle pivot axis. The pivot lever is provided at its one end with a locking member in the form of a locking lug, which are assigned to a bearing neck enclosing hub part of the guard, circumferentially and circumferentially spaced radial recesses. The other arm of the rocker arm serves as an actuating button and is spring-loaded in the direction of engagement of the locking lug in the respective receptacle corresponding pivoting direction.

Auch bei einer aus der DE 101 24 439 A1 bekannten, als Winkelschleifer ausgebildeten Werkzeugmaschine ist auf den die Antriebsspindel aufnehmenden Lagerhals eine auf verschiedene Drehpositionen einstellbare halbkreisförmige Schutzhaube vorgesehen. Diese weist radial innen einen axialen Spannbund auf und ist über ein zu Spannbund und Spannhals umgreifendes Spannband lagefest gegen den Spannhals zu fixieren. Spannband und Spannhals sind über Teile ihres Umfangs miteinander entsprechenden, axial verlaufenden, mäanderförmigen Konturen versehen, die bei nicht gespanntem Spannband, und einer vorgegebenen, einer Nichtbetriebsstellung der Schutzhaube entsprechenden Ausrichtung aufeinander aufzuschieben sind und die, bezogen auf eine hierzu verdrehte Lage von Schutzhaube und Spannband die axiale Lage der Schutzhaube zum Spannhals unverlierbar sichern. Über das Spannband ist in dessen Spannstellung eine in Drehrichtung reibschlüssige Abstützung des Spannbundes zum Spannhals gegeben. Zur Verspannung des Spannbandes ist an dessen einem Ende ein radial in eine Offenstellung ausschwenkbarer Spannhebel angelenkt, der mit dem anderen Endes des Spannbandes über ein Wellfederglied verbunden und in Spannstellung über eine Totpunktlage eingeschwenkt gegen das Spannband anliegt.Even with one from the DE 101 24 439 A1 known, designed as angle grinder machine tool is provided on the drive spindle receiving bearing neck adjustable to various rotational positions semicircular guard. This has radially on the inside an axial clamping collar and is to be fixed in a fixed position against the clamping neck via a tensioning band and clamping collar encompassing clamping band. Tensioning strap and clamping neck are mutually corresponding, axially extending, meandering contours over parts of their circumference, which are to be postponed to each other at a non-tensioned strap, and a predetermined, a non-operating position of the guard alignment and, based on a twisted this position of guard and strap Securely secure the axial position of the guard to the clamping neck. About the clamping band in the clamping position is given a frictional in the direction of rotation support of the clamping collar to the clamping neck. For clamping 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.

Eine verrastende Fixierung einer auf einem Spannhals eines Winkelschleifers geführt abgestützten Schutzhaube ist aus der im Oberbegriff des Anspruches 1 berücksichtigten DE 199 14 855 A1 bekannt. Hierzu ist ein zum Maschinengehäuse axial federnd abgestütztes Rastglied in Form einer Rastnase vorgesehen, der im zum Spannhals radial liegenden Rücken der Schutzhaube sickenförmige Rastkonturen zugeordnet sind, über die eine jeweilige Drehlage der Schutzhaube zum Maschinengehäuse drehelastisch vorgegeben ist. Der Rastwiderstand zwischen dem jeweiligen, federnd abgestützten Rastglied und den in der Schutzhaube vorgesehenen Rastkonturen ist so gewählt, dass einerseits ein unbeabsichtigtes, über den elastischen Bereich hinausgehendes Verschwenken der Schutzhaube unterbunden wird, andererseits aber die Schutzhaube von Hand unter Überwindung der durch die Verrastung gegebenen Haltekräfte verschwenkt werden kann.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. For this purpose, 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.

Zur Sicherung der jeweils gewählten Drehlage der Schutzhaube eines Winkelschleifers gegenüber dessen Spannhals sieht die DE 43 44 571 A1 eine Klemmvorrichtung vor, die in einer Aufnahmekammer des Spannhalses angeordnete Klemmelemente aufweist. Die Aufnahmekammer ist radial nach außen gegen den zum Spannhals umschließenden Ringbund der Schutzhaube offen, so dass durch Verspannung der bevorzugt elastischen Klemmelemente der Ringbund der Schutzhaube zum Spannhals zu fixieren ist. Die Verspannung der Klemmelemente erfolgt bezogen auf zwei in Umfangsrichtung des Spannhalses hintereinander in der Aufnahmekammer liegende Klemmelemente über einen zwischen den Klemmelementen liegenden Exzenternocken, der über einen Handhebel verschwenkbar ist, womit alle Drehlagen der Schutzhaube zum Spannhals lagegesichert verspannt, somit auch in Drehrichtung fixiert, einstellbar sind.To secure the selected rotational position of the guard of an angle grinder against the clamping neck sees the DE 43 44 571 A1 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.

Zur Abstützung einer Schutzhaube auf dem Lagerhals eines Winkelschleifers und zur Festlegung der Drehstellung der Schutzhaube ist es aus der DE 197 19 461 A1 bekannt, einen im Querschnitt U-förmigen, axial elastischen Ringkörper mit zum Lagerhals umschließenden Steg mit seinen Schenkeln zwischen radialen Flanschen des Lagerhalses und einem Ringbund der Schutzhaube formschlüssig drehfest anzuordnen. Zu einem der Schenkel des Ringkörpers und dem angrenzenden radialen Flansch des Lagerhalses sind Kupplungsscheiben festgelegt, die über ihren Umfang mit korrespondierenden Wellenmustern versehen, auf ihre wechselseitige Eingriffslage über den Ringkörper beaufschlagt und dadurch für den Betrieb des Winkelschleifers gegeneinander drehfest abgestützt sind. Die Einstellung jeweils gewünschter Drehlagen der Schutzhaube zum Lagerhals erfolgt manuell durch in Erstreckungsrichtung des Lagerhalses erfolgende Beaufschlagung der Schutzhaube, derart, dass die korrespondierenden Wellenmuster der Kupplungsscheiben aufgrund der axialen Elastizität des Ringkörpers außer Eingriff kommen.To support a protective hood on the bearing neck of an angle grinder and to determine the rotational position of the guard is it from the DE 197 19 461 A1 known to arrange a cross-sectionally U-shaped, axially elastic annular body with the neck surrounding the bearing neck with its legs between radial flanges of the bearing neck and a collar of the guard positively rotationally fixed. To one of the legs of the annular body and the adjacent radial flange of the bearing neck clutch discs are fixed, which provided over its circumference with corresponding shaft patterns, acted upon their mutual engagement position on the ring body and thereby rotatably supported against each other for the operation of the angle grinder. The setting of 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.

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.

Offenbarung der ErfindungDisclosure of the invention

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 claim 1. The dependent claims give expedient developments and in terms of the design of the locking arrangement also independent training.

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 zu Fig. 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 bis 3 veranschaulichten Federmittel, die in Form einer Schenkelfeder ausgebildet sind, die einen Verriegelungsschenkel und einen Befestigungsschenkel aufweist, wobei Fig. 5 entsprechend der Darstellung gemäß Fig. 1 die Schenkelfeder in Seitenansicht quer zur Federebene und in einer ihrer Verriegelungsstellung entsprechenden Federstellung und Fig. 6 die Schenkelfeder gemäß Fig. 5 in Blickrichtung gemäß Pfeil VI darstellt und wobei Fig. 7 in einer Seitenansicht gemäß Fig. 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 der Fig. 1 entsprechenden Verriegelungsstellung und schließlich, darauf folgend, strichliert in einer der Fig. 2 entsprechenden Entriegelungsstellung, in der der Verriegelungsschenkel weiter ausgeschwenkt und dementsprechend stärker vorgespannt ist.
Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:
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 to Fig. 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, wherein Fig. 5 as shown in FIG Fig. 1 the leg spring in side view transversely to the spring plane and in one of their locking position corresponding spring position and Fig. 6 the leg spring according to Fig. 5 in the direction indicated by arrow VI and where Fig. 7 in a side view according to Fig. 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 of Fig. 1 corresponding locking position and finally, subsequently, dashed in one of Fig. 2 corresponding unlocking position, in which the locking leg is further swung and accordingly biased stronger.

In den Fig. 1 und 2 sind einander entsprechende Darstellungen einer Handwerkzeugmaschine in Form einer handgeführten Schleifmaschine 1 in einer Seitenansicht gezeigt. Die Schleifmaschine 1 ist im Ausführungsbeispiel als elektrisch angetriebene Maschine ausgebildet und weist ein Gehäuse 2 auf, das, was nicht gezeigt ist, in bekannter Weise einen Antrieb mit Motor und nachgeordnetem Getriebe aufnimmt und das im Ausführungsbeispiel axial an einem seiner Enden mit einem Lagerflansch 3 verbunden, im Ausführungsbeispiel verschraubt ist. Diesbezügliche axiale Schraubverbindungen sind bei 4 angedeutet.In the 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.

Der Lagerflansch 3 ist, wie in Fig. 3 veranschaulicht, von einer Antriebsspindel 5 durchsetzt, deren Antriebsdrehrichtung mit 38 bezeichnet ist, und läuft in einem Lagerhals 6 aus. Die Antriebsspindel 5 verläuft zum Lagerhals 6 zumindest in Annäherung koaxial. Die Dreh- und Längsachse in der Antriebsspindel 5 ist mit 7 bezeichnet. Die Antriebsspindel 5 trägt endseitig auslaufend, was nicht näher dargestellt ist, ein Werkzeug 8. Das Werkzeug 8 ist bevorzugt in Form einer rotierend angetriebenen Schleif- oder Trennscheibe ausgebildet. Zumindest über einen Teil seines Umfangs ist das Werkzeug 8 von einer Schutzhaube 9 umschlossen, die auf dem Lagerhals 6 über ihren Nabenteil in Form eines Spannhalses 10 drehbar geführt und zum Lagerhals 6, was nicht dargestellt ist, axial festgelegt ist.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 auslaufend, 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.

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 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.

Entsprechend den Arbeitserfordernissen ist die Schutzhaube 9 zur Dreh- und Längsachse 7 in verschiedenen Drehstellungen als Schutzlagen festzulegen.According to the work requirements, the protective cover 9 is to set the rotational and longitudinal axis 7 in different rotational positions as protective layers.

Hierzu dient eine Verriegelungsanordnung 11, die in einer ersten Ausgestaltungsform gemäß Fig. 1 bis 3 Federmittel 12 aufweist, denen Verriegelungsglieder 13 zugeordnet sind, zu denen seitens der Schutzhaube 9 vorgesehene, dem Spannhals 10 zugeordnete Verriegelungsglieder 14 korrespondieren. Im Ausführungsbeispiel sind die seitens der Federmittel 12 vorgesehenen Verriegelungsglieder 13 als auskragende Laschen 15 ausgebildet, denen als seitens des Spannhalses 10 vorgesehene Verriegelungsglieder 14 Ausnehmungen 16 entsprechen.For this purpose, 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. In the exemplary embodiment provided on the part of the spring means 12 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.

Die Federmittel 12 sind im Ausführungsbeispiel gemäß Fig. 1 bis 3 als U-förmige Schenkelfeder 17 mit einem Verriegelungsschenkel 18, einem Befestigungsschenkel 19 und einem diese Schenkel verbindenden U-förmigen Scheitelbogen 20 gestaltet. Die Federebene der U-förmigen Schenkelfeder 17 erstreckt bei deren Anordnung gemäß Fig.1 bis 3 axial, das heißt in Längsrichtung der Dreh- und Längsachse 7, und somit bezogen auf die Ansicht gemäß Fig. 1 und 2 parallel zur Zeichenebene, und bezogen auf die Schnittdarstellung gemäß Fig. 3 senkrecht zur Zeichenebene.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.

In entsprechender Weise greifen die Laschen 15 bei radialer Überlappung axial in die Ausnehmungen 16 in ihrer Verriegelungsstellung ein (Fig. 1) und sind im Wesentlichen axial aus den Ausnehmungen 16 entsprechend der Darstellung gemäß Fig. 2 ausgeschwenkt.In a corresponding manner, 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.

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 leg 18 and mounting leg 19th these offset in the axial direction over the extending in the axial direction vertex bend 20 are connected so that the legs 18, 19 against each other, and thereby also the free end of the locking leg 18 expiring end provided handle 21, pivotable about an imaginary pivot axis defined by the vertex 20 are.

Die U-förmige Schenkelfeder 17 ist bevorzugt, wie in den Fig. 1 bis 3 dargestellt, als U-förmig gekrümmte Blattfeder gestaltet, und zwar bei zur Federebene quer liegenden Breitseiten 22 und in Richtung der Federebene verlaufenden Schmalseiten 23, wie insbesondere auch aus den Fig. 5 bis 7 ersichtlich.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.

In den Fig. 5 bis 7, insbesondere in Fig. 6, ist auch veranschaulicht, dass sich in einer Draufsicht auf die U-förmige Schenkelfeder 17 gemäß Pfeil VI in Fig. 5 der Verriegelungsschenkel 18 und der Befestigungsschenkel 19 bevorzugt unter einem Winkel 24 zueinander erstrecken, durch den in der Draufsicht gemäß Fig. 5 das der Schraubverbindung 4 zugeordnete Schraubloch 25 im Befestigungsschenkel 19 zumindest teilweise, bevorzugt zumindest im Wesentlichen überdeckungsfrei zum Verriegelungsschenkel 18 liegt und somit eine einfache Verschraubung der Federmittel 12 in Form der Schenkelfeder 17 stirnseitig zum Lagerflansch 3 ermöglicht, wie dies aus Fig. 1 und 2 ersichtlich ist. Die Verschränkung der Schenkelfeder 17 im Bereich des Scheitelbogens 20 gibt darüber hinaus die Möglichkeit einer Anordnung der Schenkelfeder 17 mit bezogen auf die Umfangsrichtung des Lagerhalses 6 gegensinniger Erstreckung von Verriegelungsschenkel 18 und Befestigungsschenkel 19, wobei der Verriegelungsschenkel 18 quer zur Dreh- und Längsachse 7 im Wesentlichen tangential zum Lagerhals 6 verläuft und, wie Fig. 6 zeigt, im Bereich der am Verriegelungsschenkel 18 vorgesehenen, durch die Laschen 15 gebildeten Verriegelungsglieder 13 nach radial außen ausgewölbt ist, so dass sich eine der Umfangskontur des Spannhalses 10 im Verriegelungsbereich entsprechende Verlaufskontur des Verriegelungsschenkels 18 ergibt.In the 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. The entanglement of the 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.

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 leg 19 and the U-shaped vertex arch 20 transversely to the rotational and longitudinal axis 7 substantially unyielding support of the locking leg 18 would have the consequence that in the locked position, the guard 9 rotatably, that is rotationally fixed in the circumferential direction of the bearing neck 6 in their respective rotational position would be fixed.

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 Fig. 1 bis 3 längs der Dreh- und Längsachse 7 verlaufenden Verriegelungsebene. Eine solche Verriegelungsanordnung verkörpert dementsprechend auch schon eine eigenständige erfindungsgemäße Gestaltung.Such a support of the protective cover 9 on the leg spring 17 in its described training is indeed advantageous over known solutions, as it allows simple installation and design considerations with simple means, and thus reasonably priced a basic setting of the guard 9 in different locking positions, and this alone the resilient compliance of the locking leg 18 in the direction of in Fig. 1 to 3 along the rotational and longitudinal axis 7 extending locking plane. Accordingly, such a locking arrangement already embodies an independent design according to the invention.

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 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. In other words, based on a respective locking position by the elastically yielding support, a sector is determined as the pivoting range, over which the protective layer can change depending on the torque to be supported.

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 guard 9 in one, or based on a respective Locking position is achieved in the pre-formed design by a corresponding compliance of the spring means 12, so the leg spring 17, which in turn is fixed via the mounting legs 19 rigidly to the bearing flange 3, and thus also to the bearing neck 6. In the context of the invention, a corresponding effect can be realized at least partially or additionally by fixing the fastening leg 19 instead of the rigid screw connection 4 via an elastic connection to the bearing flange 3 or another part fixed to the housing.

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 Fig. 6 dargestellt ist, die für den Verriegelungsschenkel 18 zulaufend auf seinen die Laschen 15 als Verriegelungsglieder 13 tragenden ausgewölbten Bereich 26 eine größere Breite 27 vorsieht als für den durch den Scheitelbogen 20 gebildeten Bereich, der eine Breite 28 aufweist. Entsprechende Effekte lassen sich, gegebenenfalls auch verstärkt, durch Veränderungen des jeweils tragenden Querschnittes, zum Beispiel über Ausnehmungen, Verrippungen oder dergleichen erzielen, was nicht dargestellt ist.With regard to the resilient support of the locking leg 18 in the direction of the spring plane and / or in view of the predetermined by a respective locking position of the locking assembly 11 starting position for a to this starting position by elastically resilient in the direction of rotation support of the protective cover 9 protective layer proves to be appropriate to change the leg spring 17 in the region of its U-shaped apex arc 20 and / or the one or more outgoing areas of the locking leg 18 and / or the mounting leg 19 over its cross-section, wherein a preferred solution in Fig. 6 is shown, which for the locking leg 18 tapering on its the tabs 15 as a locking members 13 bearing bulging portion 26 provides a greater width 27 than for the portion formed by the apex arc 20 having a width 28. Corresponding effects can be achieved, possibly also reinforced, by changes in the respective supporting cross-section, for example via recesses, ribbing or the like, which is not shown.

Fig. 7 veranschaulicht Stellungen des Verriegelungsschenkels 18 der Schenkelfeder 17 in ihrer nicht montierten Ausgangslage, die in Volllinien dargestellt ist. Die strichpunktiert dargestellte Mittellage der Schenkelfeder 18 entspricht einer Verriegelungsstellung gemäß Fig. 1 und einer Lage gemäß Fig. 5, in der eine dem Schwenkweg 29 entsprechende Spannkraft aufgebaut ist. Die Schenkelfeder 17 ist somit auf ihre Verriegelungsstellung vorgespannt und zur Verlagerung in die Entriegelungsstellung, die als dritte Stellung strichliert dargestellt ist, ist ein vergrößerter Schwenkweg 30 zu überwinden, so dass gegebenenfalls auch mit Vergrößerung des Drehmomentes, das die Schutzhaube 9 beaufschlagt und das gegebenenfalls zu einer Beaufschlagung des Verriegelungsschenkels 18 in Richtung auf seine Entriegelungsstellung führt, entsprechend größere Vorspannkräfte aufgebaut werden. 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.

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 drive spindle 5 and protective cover 9, 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.

Die Fig. 1 bis 3, gehen, wie geschildert, von einer Anordnung einer Schenkelfeder 17 mit in Längsrichtung der Dreh- und Längsachse 7 verlaufender Federebene aus. Fig. 4 zeigt in einer im Grundaufbau der Fig. 3 entsprechenden Darstellung eine abweichende Anordnung einer U-förmigen Schenkelfeder 31, die analog zu Fig. 1 bis 3 wiederum einen Verriegelungsschenkel 32, einen Befestigungsschenkel 33 und einen U-förmigen, diese Schenkel 32, 33 verbindenden Scheitelbogen 34 aufweisen. Der Befestigungsschenkel 32 ist, wie symbolisch gezeigt ist, über eine Schraubverbindung 37 beispielsweise an einem Stützhöcker 35 abgestützt, der axial überstehend am Lagerflansch 3 vorgesehen ist. Abweichend zur Gestaltung gemäß Fig. 1 bis 3 ist die Schenkelfeder 31 bei der Lösung gemäß Fig. 4 so angeordnet, dass zum Spannhals 10 zwischen dargestellter Verriegelungsstellung und nicht dargestellter Entriegelungsstellung ein zur Dreh- und Längsachse 7 radialer Schwenkweg 36 für den Verriegelungsschenkel 32 gegeben ist, somit eine zur Zeichenebene gemäß Fig. 4 parallele Federebene mit bezogen auf die Dreh- und Längsachse 7 radialem Eingriff der über eine Handhabe 21 des Verriegelungsschenkels 32 verstellbaren, durch Laschen 15 gebildeten Verriegelungsglieder 13. Auch bei dieser Lösung ist die Schenkelfeder 31 bevorzugt als Blattfeder mit in Richtung der Federebene verlaufende Schmalseiten und quer zur Federebene liegenden Breitseiten 22 ausgebildet.The 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. 4 arranged so that the clamping neck 10 between the illustrated locking position and not shown unlocking position is given to a rotational and longitudinal axis 7 radial pivoting path 36 for the locking leg 32, thus according to the plane of the drawing Fig. 4 parallel spring plane with respect to the rotational and longitudinal axis 7 radial engagement of a handle 21 of the locking leg 32 adjustable, formed by tabs 15 locking members 13. Also in this solution, 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.

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 Fig. 3 und 4 analog dargestellten Ausgestaltungsformen die Ausführungen zu Fig. 1 bis 3 in entsprechender Anpassung gelten.Functionally, given the differences between radial and axial access of the locking members 13 on the clamping neck 10 given each other largely corresponding conditions, which can be additionally taken into account by constructive adjustments in a simple manner, so that for the two in the Fig. 3 and 4 analogously illustrated embodiments, the comments on Fig. 1 to 3 in appropriate adjustment apply.

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 protective hood 9 in their protective layer a pivoting range determined by elastic compliance. This once by the fact that the protective cover in its protective position to a located in a respective locking position locking arrangement has an elastically resilient pivoting range, be it by a torsionally elastic support between the locking members or a downstream lying in the transition to the guard 9 torsionally elastic connection. In a further embodiment, an elastically yielding pivoting area can be created for the protective hood 9 in its protective position in a respective locking position to the protective hood 9 befindlicher locking assembly 11 by the housing side elastic attachment of the locking assembly 11. After all According to the invention, the protective hood 9 can be achieved in its protective position in a respective locking position to the protective hood 9 befindlicher 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.

Claims (7)

  1. 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.
  2. 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).
  3. 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).
  4. 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).
  5. 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.
  6. 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.
  7. 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).
EP20080872878 2008-02-25 2008-11-12 Hand-held power tool, in particular hand-guided grinding machine Active EP2252430B1 (en)

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

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US (1) US8512104B2 (en)
EP (1) EP2252430B1 (en)
CN (1) CN101959646B (en)
DE (1) DE102008010977A1 (en)
RU (1) RU2495740C2 (en)
WO (1) WO2009106163A1 (en)

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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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