EP2428316B1 - Hand tool machine, in particular manual angle grinder - Google Patents

Hand tool machine, in particular manual angle grinder Download PDF

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Publication number
EP2428316B1
EP2428316B1 EP11188526A EP11188526A EP2428316B1 EP 2428316 B1 EP2428316 B1 EP 2428316B1 EP 11188526 A EP11188526 A EP 11188526A EP 11188526 A EP11188526 A EP 11188526A EP 2428316 B1 EP2428316 B1 EP 2428316B1
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EP
European Patent Office
Prior art keywords
clamping
exciting
clamp
respect
fixed
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EP11188526A
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German (de)
French (fr)
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EP2428316A1 (en
Inventor
Albrecht Hofmann
Thomas Schomisch
Florian Esenwein
Hongqun Chen
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2428316A1 publication Critical patent/EP2428316A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools

Definitions

  • the invention relates to a hand tool, in particular a hand-held angle grinder, according to the preamble of claim 1.
  • Hand tool machines of the aforementioned type with disk-shaped, rotationally driven tool and covering the tool covering protective hood are known in many embodiments from practice.
  • the guard has radially outward to its flat, semi-circular edge on an axially bent towards the tool edge and radially inside a axially extending in the opposite direction support collar on which the tool-carrying drive shaft enclosing the housing side bearing neck is seated.
  • a clamp which is formed in the manner of pipe clamps, as an open clamping ring with end radially issued Exciting, which are connected in the direction of a bearing neck approximately tangentially extending clamping axis via a clamping device.
  • clamping forces can be kept relatively small, but are to loosen the clamping device correspondingly large, so that the setting of different protective layers of the guard by turning around the bearing neck is difficult, especially if the guard in their respective locking position not only frictionally, but optionally also determined by appropriate training of support collar and bearing neck form-fitting and accordingly for adjusting support collar and neck a relatively large clearance is necessary.
  • A1 known hand-held angle grinder is on the bearing neck for the grinding wheel shaft a Supported grinding wheel overlapping guard. This via a support collar of the support hood, which surrounds the bearing neck and is supported against the bearing neck via a clamping collar on the outside of the support collar in different rotational positions fixed. At their open and converging ends of the clamp is provided with radially projecting clamping ends, which are connected via a clamping device.
  • This clamping device has a tangent to the circumference of the bearing neck and clamping collar clamping screw, which passes through the exciting and which is freely displaceable against the tensioned by the screw head of the clamping screw exciting.
  • the clamping screw in the direction of its clamping axis via a threaded connection is axially adjustable, so that the displacement of the clamping screw is limited against the acted upon by the screw tension over the screw head only in the clamping direction by conditioning the screw head at the exciting.
  • Another clamping device for the defined adjustment of the diameter of clamps on one of their exciting passing through the clamping screw of clamping devices is from the GB 1 278 732 A known, in which the clamping screw against the one of the exciting is also axially fixed via two abutment, one of which is formed by the screw head of the clamping screw and the other by a screw shaft fixed to the abutment disc.
  • the invention is based on the object in manual power tools of the aforementioned type, regardless of the respective structurally predetermined bias for the clamp to make the adjustment of the guard in a simple manner and controlled possible.
  • the protective cover to the bearing neck is to be fixed via a clamp which is adjustable via the associated clamping device not only in the clamping direction, but also in the opening direction, so that the amount of over the clamping clamp applied clamping forces between the extremes - maximum clamping and clamping force zero - adjustable.
  • Such a variable adjustment of the clamping force is achieved with a clamping device in which the exciting of the clamp are connected via a clamping element which is supported during clamping and relaxing for a exciting axially adjustable and the other exciting axially positionally stable.
  • a clamping screw as a clamping element, which is supported on the one exciting over a threaded connection and the other exciting freely rotatable, but axially secured in position is supported.
  • the axially positionally stable and rotatable securing relative to the screw head side exciting is achieved in that the clamping element, with rotatable and axial adjustability to the other exciting, by axially mutual supports, as an abutment between the clamping element and exciting, with cross-sectional intersections to clamping element and exciting, the to the screw head relative to the exciting opposing abutment is formed by an engaging in an undercut portion of the screw shaft supporting element.
  • the support member may be formed separately by a washer or a snap ring, or by a forked exciting.
  • the screw-head side exciting may optionally be recorded with axial clearance between the screw head and lock washer, the clamping screw as a tensioning element, recorded.
  • the threaded connection of the one exciting to trained in particular as a clamping screw clamping element may also be provided on the head side to the clamping screw in axially position-secured support to the other exciting.
  • the protective hood 1 of a hand-held power tool designed as an angle grinder is shown, from the in Fig. 2 only the housing-side bearing flange 2 is shown, which is penetrated by the drive shaft, not shown, which is partially covered by the protective cover 1 supporting tool and having a bearing neck 3, on which the protective cover 1 via its axially, that is in the direction of the axis. 5 the bearing neck 3 extending, radially inner support collar 4 is supported.
  • the user side lying, semi-circular edge 6 also covers the support collar 4 substantially only one half of the bearing neck 3, wherein the support collar 4 extends in the direction of the housing of the machine tool, and thus opposite to the projecting over the tool, radially outside the protective cover 1 provided screen edge 7 of the protective hood.
  • the bearing collar 3 surrounds the support collar 4 and the opposite at its open end, radially extending clamping ends. 9 , 10, transverse to which the clamping axis 11 of a clamping device 16 extends, as in different embodiments with reference to FIG Fig. 3 to 11 is explained.
  • support collar 4 When clamped over the clamping collar 8 to the bearing neck 3 support collar 4 basically results in a frictional connection and hedging the respective rotational position of the guard 1 to the axis 5, wherein the corresponding frictional forces are dependent, inter alia, on the tension clamp 8 applied clamping forces.
  • Fig. 1 is indicated that by appropriate profiling in the contact surface between the support collar 4 and the bearing neck 3 in addition a positive rotation can be achieved, wherein in Fig. 1 In this regard, only one of the support collar 4 given profiling 13 is indicated, which corresponds to a not shown, corresponding counter-profile on the bearing neck 3.
  • the clamp 8 in turn in the opposite region of the support collar 4 is provided with at least one thickening 14 which corresponds to a recess in the neck 3, on the trough-shaped design, the clamp 8 can be secured in its axial position to the bearing neck 3. Furthermore, a limitation of the range of rotation between clamp 8 and protective cover 1 can be made via the thickening 14, for example, even in the case of a trough-shaped design.
  • the thickening can also serve to specify the bearing neck 3 with a corresponding counter-profile a rotational position for the clamp 8 and / or to achieve a radial support of the clamp 8 outside their coverage area to the support collar 4 in a height of the support collar 4 approximately corresponding distance.
  • the clamp 8 Regardless of the extent to which the clamp 8 is in turn biased towards its clamping position, to what extent so, if appropriate corresponding bias, the clamp 8 must be expanded to a rotation, or a clearance and a rotation of the support collar 4 relative to the bearing neck. 3 to make a respective rotational position possible, the rotation in the inventive solution by simple and targeted possible that the exciting 9, 10 of the clamp 8 are forcibly coupled via the clamping device 16 in the clamping direction, ie in the clamping and opening direction, so that targeted and quickly a rotational position change for the protective cover 1 and a lock in the respective protective layer can be made.
  • a first embodiment of such a clamping device 16 show the 3 and 4 in which a clamping screw 18 is provided as the clamping element 17, which extends in the direction of the clamping axis 11 and connects the opposing clamping ends 9 and 10 by passing.
  • the clamping screw 18 has a shaft 19 which is connected to the exciting end 10 via a threaded connection 20 axially adjustable, the threaded connection 20 is formed by the tension end 10 by a connected to the exciting 10 nut or a flared threaded neck.
  • the opposite exciting 9 has for the shaft 19 has a through hole and it is the end of the screw head 21 is provided, which loaded via an issued, in particular cut, tab-shaped portion 22 of the exciting 9 in the direction of its investment to the exciting 9 and held in abutment with this becomes.
  • the section 22 may be a kind of Federlasche be designed so that it springs when inserting the clamping screw 18 in the overlap position to the screw head 21.
  • the clamp 8 can not only be tightened by twisting the clamping screw 18, but also spread, so that, depending on the type of connection between Support collar 4 and neck 3, either the friction is reduced so much that a rotation of the protective cover 1 is possible, or at not only frictional, but also positive connection between the support collar 4 and bearing neck 3, the support collar 4 so far lifted from the bearing neck 3 can be that a corresponding adjustment of the protective cover 1 is possible.
  • Fig. 5 shows one of the design according to Fig. 3 essentially corresponding solution, but here lying on the part of the screw head 21 exciting 9 ends aus convincedd is taken over the screw head 21, so a bent, end-side section 23 of the exciting 9 holds the screw head 21 in its axial abutment to the exciting 9.
  • Fig. 6 is that on the basis of Fig. 3 and 5 explained principle for securing the axial position of the screw head 21 relative to the exciting 9 realized using an additional support member 24 which is in the manner of a washer between the screw head 21 and exciting 9 and secured in the exciting 10 screwed clamping screw 18 is also secured in this intermediate position.
  • the holding element 24 has one, or more, from its lying between the screw head 21 and exciting 9 disc part 25 outgoing tabs 26 which are inflected over the screw head 21, and thereby secure the screw head 21 to the disc part 25. Further, starting from the disk part 25, at least one, preferably a plurality of tabs 27 are provided, which are laterally supported over the latter for exciting purposes.
  • the tabs 27 may also be taken to run counter to the chuck 21 on the exciting 9, so that regardless of the tension of the clamping screw 18 a position securing the same with respect to the exciting 9 is achievable.
  • the location and formation of the flaps 26, 27 in Fig. 6 Although preferred within the scope of the invention, but only by way of example with regard to the desired function.
  • FIGS. 7 and 8 illustrate another solution of a clamping device 16 with clamping screw 18, wherein the clamping screw 18 in turn has a threaded shaft 19 and a screw head 21 and wherein subsequent to the screw head 21 of the shaft 19 has an undercut 28 formed by an annular groove 29 in the shaft 19th
  • the clamping screw 18 can be secured to the exciting 9, for example, that, as in Fig.
  • the recess 30 laterally bounding legs 32, 33 are bent together. In a corresponding manner, a positional fixation can be achieved even with corresponding resilient resilience of the legs 32, 33, in particular if the recess 30 has at its inner end a corresponding to the cross section of the shaft 19 in the region of the undercut 28 expansion.
  • Fig. 9 illustrates a further embodiment in which the axial position of the clamping screw 18 is fixed to the exciting 9, that with respect to the exciting 9 opposite to the screw head 21 of the shaft 19 has a groove-shaped undercut 34, in the abutment 35 is a slotted disc or the like becomes.
  • the disc forming the abutment 35 is arranged in this embodiment at an axial distance from the screw head 21, which is greater than the thickness of the tension end 9, so that via the screw head 21 and the abutment 25, the clamping screw 18 is set with some axial play to exciting 9 ,
  • exciting the clamping device 37 associated clamping screw 18 is rotatably supported but axially fixed position, illustrated by both sides of the exciting 39 to the threaded shaft 19 axially positional abutment, for example, by engaging in undercut portions of the shaft 19 support plates 41, 42nd or the like may be formed.
  • a corresponding axially fixed position, rotatable support of the clamping screw 18 can also according to Fig. 11 be designed, in which solution as the exciting 39 flared portion 45 a tab 43 is provided which forms an end stop for the head 21 opposite the end of the shaft 19.
  • the axially positionally stable, possibly with a certain clearance attribution of the shank 19 of the screw 18 to the exciting 39 requires a corresponding securing position of the shaft 19 to the tab 43, which takes place via an abutment 44 which is associated with the shaft 19 on the side remote from the head 21 and which in turn is formed, for example, by a support disk or the like engaging in a groove of the shank 19.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Clamps And Clips (AREA)
  • Jigs For Machine Tools (AREA)

Description

Die Erfindung bezieht sich auf eine Handwerkzeugmaschine, insbesondere eine handgeführte Winkelschleifmaschine, gemäß dem Oberbegriff des Anspruches 1.The invention relates to a hand tool, in particular a hand-held angle grinder, according to the preamble of claim 1.

Stand der TechnikState of the art

Handwerkzeugmaschinen der vorgenannten Art mit scheibenförmigen, rotierend angetriebenem Werkzeug und zum Werkzeug überdeckend liegender Schutzhaube sind in vielen Ausgestaltungen aus der Praxis bekannt. Generell weist die Schutzhaube radial außen zu ihrer flächigen, halbkreisförmigen Flanke einen axial in Richtung auf das Werkzeug abgebogenen Rand und radial innen einen sich axial in Gegenrichtung erstreckenden Stützbund auf, der auf dem die das Werkzeug tragende Antriebswelle umschließenden gehäuseseitigen Lagerhals aufsitzt. Zum Lagerhals ist der Stützbund über eine Spannschelle verspannt, die, nach Art von Rohrschellen, als offener Spannring mit endseitig radial ausgestellten Spannenden ausgebildet ist, welche in Richtung einer zum Lagerhals sich etwa tangential erstreckenden Spannachse über eine Spannvorrichtung verbunden sind. In Abhängigkeit von der Vorspannung der Spannschelle können beim Festziehen derselben die über die Spannvorrichtung aufzubringenden Spannkräfte verhältnismäßig klein gehalten werden, sind dafür aber zum Lösen der Spannvorrichtung entsprechend groß, so dass die Einstellung unterschiedlicher Schutzlagen der Schutzhaube durch Verdrehen um den Lagerhals erschwert wird, zumal wenn die Schutzhaube in ihrer jeweiligen Verriegelungslage nicht nur reibschlüssig, sondern durch entsprechende Ausbildung von Stützbund und Lagerhals gegebenenfalls auch formschlüssig festgelegt ist und dementsprechend zur Verstellung Stützbund und Lagerhals ein verhältnismäßig großes Freimaß nötig ist.Hand tool machines of the aforementioned type with disk-shaped, rotationally driven tool and covering the tool covering protective hood are known in many embodiments from practice. Generally, the guard has radially outward to its flat, semi-circular edge on an axially bent towards the tool edge and radially inside a axially extending in the opposite direction support collar on which the tool-carrying drive shaft enclosing the housing side bearing neck is seated. To camp neck of the support collar is clamped by a clamp, which is formed in the manner of pipe clamps, as an open clamping ring with end radially issued Exciting, which are connected in the direction of a bearing neck approximately tangentially extending clamping axis via a clamping device. Depending on the bias of the clamp when tightening the same applied over the clamping device clamping forces can be kept relatively small, but are to loosen the clamping device correspondingly large, so that the setting of different protective layers of the guard by turning around the bearing neck is difficult, especially if the guard in their respective locking position not only frictionally, but optionally also determined by appropriate training of support collar and bearing neck form-fitting and accordingly for adjusting support collar and neck a relatively large clearance is necessary.

Bei einer aus der DE 10 2006 022 386 A1 bekannten handgeführten Winkelschleifmaschine ist auf deren Lagerhals für die Schleifscheibenwelle eine die Schleifscheibe übergreifende Schutzhaube abgestützt. Dies über einen Stützbund der Stützhaube, der den Lagerhals umgreift und gegen den Lagerhals über eine am Stützbund außenseitig anliegende Spannschelle in unterschiedlichen Drehlagen fixierbar abgestützt ist. An ihren offenen und aufeinander zulaufenden Enden ist die Spannschelle mit radial auskragenden Spannenden versehen, die über eine Spannvorrichtung verbunden sind. Diese Spannvorrichtung weist eine zum Umfang von Lagerhals und Spannschelle tangential verlaufende Spannschraube auf, welche die Spannenden durchsetzt und welche gegen das vom Schraubkopf der Spannschraube beaufschlagete Spannende frei verschiebbar ist. Zum anderen Spannende ist die Spannschraube in Richtung ihrer Spannachse über eine Gewindeverbindung axial verstellbar, so dass der Verschiebeweg der Spannschraube gegen das vom Schraubkopf beaufschlagte Spannende über den Schraubkopf lediglich in Spannrichtung durch Anlage des Schraubkopfes am Spannende begrenzt ist.At one of the DE 10 2006 022 386 A1 known hand-held angle grinder is on the bearing neck for the grinding wheel shaft a Supported grinding wheel overlapping guard. This via a support collar of the support hood, which surrounds the bearing neck and is supported against the bearing neck via a clamping collar on the outside of the support collar in different rotational positions fixed. At their open and converging ends of the clamp is provided with radially projecting clamping ends, which are connected via a clamping device. This clamping device has a tangent to the circumference of the bearing neck and clamping collar clamping screw, which passes through the exciting and which is freely displaceable against the tensioned by the screw head of the clamping screw exciting. On the other exciting, the clamping screw in the direction of its clamping axis via a threaded connection is axially adjustable, so that the displacement of the clamping screw is limited against the acted upon by the screw tension over the screw head only in the clamping direction by conditioning the screw head at the exciting.

Bei insbesondere für Batterieanschlüsse vorgesehenen und somit kleine Stellwege erfordernden Spannvorrichtungen eines solchen Grundaufbaus ist es aus der FR 931 202 A bekannt, diese so auszubilden, dass eine definierte Verstellung der Spannschelle sowohl in Öffnungsrichtung wie auch entgegengesetzt in Schließrichtung möglich ist. Hierzu ist das schraubkopfseitige Spannende der Spannschelle zur Spannschraube axial dadurch festgelegt, dass dieses zwischen zwei zum Schraubschaft lagefesten Widerlagern liegt, deren eines durch den Schraubkopf und deren anderes durch eine auf den Schraubschaft aufgefädelte und zum Schraubschaft insbesondere durch Verschweißen fixierte Stützscheibe gebildet ist.When provided in particular for battery connections and thus small travel paths requiring clamping devices of such a basic structure, it is from the FR 931 202 A known to form these so that a defined adjustment of the clamp in both the opening direction as well as opposite in the closing direction is possible. For this purpose, the schraubkopfseitige exciting the clamp for clamping screw axially defined by the fact that this is between two fixed to the screw shank abutments, one of which is formed by the screw head and the other by a threaded onto the screw shaft and fixed to the screw shaft in particular by welding support disk.

Eine weitere Spannvorrichtung zur definierten Verstellung des Durchmessers von Spannschellen über eine deren Spannenden durchsetzende Spannschraube von Spannvorrichtungen ist aus der GB 1 278 732 A bekannt, bei der die Spannschraube gegen das eine der Spannenden axial ebenfalls über zwei Widerlager festgelegt ist, deren eines durch den Schraubkopf der Spannschraube und deren anderes durch eine zum Schraubschaft fixierte Widerlagerscheibe gebildet ist.Another clamping device for the defined adjustment of the diameter of clamps on one of their exciting passing through the clamping screw of clamping devices is from the GB 1 278 732 A known, in which the clamping screw against the one of the exciting is also axially fixed via two abutment, one of which is formed by the screw head of the clamping screw and the other by a screw shaft fixed to the abutment disc.

Ferner ist aus der US 3 503 431 A1 eine Lagesicherung für einen zwei flächig aneinander anliegende Bauteile durchsetzenden Schraubbolzen bekannt, bei der der Schraubbolzen in seiner Einstecklage zu einer diese Bauteile durchsetzenden Bohrung dadurch gesichert ist, dass der Bolzenschaft gegenüberliegend zum auf einem der Bauteile abgestützten Bolzenkopf in seinem über das andere Bauteil hinausragenden, Bereich einen im Durchmesser hinterschnittenden Axialbereich aufweist, in den als zum Bolzenkopf gegenüberliegendes Widerlager ein Haltekragen eingreift und so die Axiallage des Schraubbolzens zu den von ihm durchsetzten Bauteilen sichert.Furthermore, from the US Pat. No. 3,503,431 A1 a position assurance for a two-surface abutting components passing through bolt known, in which the bolt is secured in its insertion position to a these components passing through hole, that the bolt shank opposite to the supported on one of the components bolt head in its projecting beyond the other component, area having an undercut axial diameter in the axial region, in the opposite than the bolt head abutment engages a retaining collar and thus secures the axial position of the bolt to the interspersed by him components.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt die Aufgabe zugrunde, bei Handwerkzeugmaschinen der vorgenannten Art unabhängig von der jeweils konstruktiv vorgegebenen Vorspannung für die Spannschelle die Verstellung der Schutzhaube in einfacher Weise und kontrolliert möglich zu machen.The invention is based on the object in manual power tools of the aforementioned type, regardless of the respective structurally predetermined bias for the clamp to make the adjustment of the guard in a simple manner and controlled possible.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Anspruches 1 gelöst. Die Unteransprüche geben zweckmäßige Weiterbildungen an.This object is achieved with the features of claim 1. The dependent claims indicate expedient developments.

Bei der erfindungsgemäßen Lösung ist die Schutzhaube zum tragenden Lagerhals über eine Spannschelle zu fixieren, die über die zugeordnete Spannvorrichtung nicht nur in Spannrichtung, sondern auch in Öffnungsrichtung verstellbar ist, so dass über die Spannvorrichtung die Höhe der über die Spannschelle aufzubringenden Spannkräfte zwischen den Extremen - maximale Verspannung und Spannkraft Null - einstellbar ist. Dadurch kann einerseits für die Schutzhaube eine sichere Betriebslage ungeachtet der jeweils gegebenen Vorspannung der Spannschelle erreicht werden, und andererseits, wiederum unabhängig von der Vorspannkraft, die Spannschelle so eingestellt werden, dass die Verdrehung der Schutzhaube um den Lagerhals mit einem auf die Bedürfnisse des Benutzers jeweils abgestimmten Kraftaufwand möglich ist.In the solution according to the invention, the protective cover to the bearing neck is to be fixed via a clamp which is adjustable via the associated clamping device not only in the clamping direction, but also in the opening direction, so that the amount of over the clamping clamp applied clamping forces between the extremes - maximum clamping and clamping force zero - adjustable. As a result, on the one hand for the guard a safe operating position regardless of the given bias of the clamp can be achieved, and on the other hand, again independent of the biasing force, the clamp are adjusted so that the rotation of the guard to the stock neck with a to the needs of the user respectively coordinated effort is possible.

Eine solche variable Einstellung der Spannkraft wird mit einer Spannvorrichtung erreicht, bei der die Spannenden der Spannschelle über ein Spannelement verbunden sind, das beim Spannen und beim Entspannen zum einen Spannende axial verstellbar und zum anderen Spannende axial lagefest abgestützt ist. Dies mit einer Spannschraube als Spannelement, die zum einen Spannende über eine Gewindeverbindung abgestützt ist und die zum andern Spannende frei drehbar, aber axial lagegesichert abgestützt ist.Such a variable adjustment of the clamping force is achieved with a clamping device in which the exciting of the clamp are connected via a clamping element which is supported during clamping and relaxing for a exciting axially adjustable and the other exciting axially positionally stable. This with a clamping screw as a clamping element, which is supported on the one exciting over a threaded connection and the other exciting freely rotatable, but axially secured in position is supported.

Die axial lagefeste und verdrehbare Sicherung gegenüber dem schraubkopfseitigen Spannende wird dadurch erreicht, dass das Spannelement, bei drehbarer und axialer Verstellbarkeit zum anderen Spannende, durch axial wechselseitige Abstützungen, als Widerlager zwischen Spannelement und Spannende, mit Querschnittsüberschneidungen zu Spannelement und Spannende gehalten wird, wobei das zum Schraubkopf bezogen auf das Spannende gegenüberliegende Widerlager durch ein in einen hinterschnittenen Bereich des Schraubschaftes eingreifendes Stützelement gebildet wird. Das Stützelement kann separat durch eine Scheibe oder einen Sicherungsring, oder durch ein gegabeltes Spannende gebildet sein. Ferner kann das schraubenkopfseitige Spannende gegebenenfalls mit axialem Spiel zwischen Schraubkopf und Sicherungsscheibe, zur Spannschraube als Spannelement lagegesichert, aufgenommen sein.The axially positionally stable and rotatable securing relative to the screw head side exciting is achieved in that the clamping element, with rotatable and axial adjustability to the other exciting, by axially mutual supports, as an abutment between the clamping element and exciting, with cross-sectional intersections to clamping element and exciting, the to the screw head relative to the exciting opposing abutment is formed by an engaging in an undercut portion of the screw shaft supporting element. The support member may be formed separately by a washer or a snap ring, or by a forked exciting. Furthermore, the screw-head side exciting may optionally be recorded with axial clearance between the screw head and lock washer, the clamping screw as a tensioning element, recorded.

In analoger Weise kann die Gewindeverbindung des einen Spannendes zum insbesondere als Spannschraube ausgebildeten Spannelement auch kopfseitig zur Spannschraube vorgesehen sein, bei axial lagegesicherter Abstützung zum andern Spannende.In an analogous manner, the threaded connection of the one exciting to trained in particular as a clamping screw clamping element may also be provided on the head side to the clamping screw in axially position-secured support to the other exciting.

Weitere Vorteile und zweckmäßige Ausführungen ergeben sich aus den Ansprüchen, der Figurenbeschreibung und den Zeichnungen. Es zeigen:

Fig. 1
eine isolierte Darstellung der Schutzhaube einer als Winkelschleifer ausgebildeten Handwerkzeugmaschine in einer Ansicht auf die dem Benutzer zugewandte Flanke mit einer einem Stützbund der Schutzhaube zugeordneten Spannschelle,
Fig. 2
in einer der Fig. 1 weitgehend entsprechenden Darstellung der Schutzhaube eine Ansicht von der Gegenseite, also der Werkzeugseite, wobei in dieser Darstellung der Lagerhals zusätzlich gezeigt ist, auf dem die Schutzhaube mit ihrem Stützbund angeordnet ist und der als Bestandteil eines gehäuseseitigen Lagerflansches von der nicht gezeigten, das Werkzeug tragenden Antriebswelle durchsetzt ist.
Fig. 3 und 4
eine ausschnittsweise Darstellung der Spannschelle, über die der Stützbund der Schutzhaube gegen den Lagerhals verspannbar ist, in einer Ansicht und in einer Draufsicht gemäß Pfeil IV,
Fig. 5 und 6
weitere Ausführungsbeispiele in der Fig. 3 entsprechender Darstellung,
Fig. 7 und 8
ein weiteres Ausführungsbeispiel in Fig. 3 und 4 entsprechenden Darstellungen,
Fig. 9
eine weitere Ausführungsform in Fig. 3 entsprechender Darstellung,
Fig. 10
eine weitere Ausgestaltung in der Fig. 3 entsprechenden Ansicht, und
Fig. 11
eine dem Ausschnitt XI in Fig. 10 entsprechende Darstellung einer weiteren Lösung zur drehbaren, aber axial lagefesten Abstützung des Schraubschaftes gegenüber einem Spannende.
Further advantages and expedient embodiments will become apparent from the claims, the description of the figures and the drawings. Show it:
Fig. 1
an isolated view of the protective hood designed as an angle grinder hand tool in a view of the User facing flank with a support collar of the protective hood associated clamp,
Fig. 2
in one of the Fig. 1 largely corresponding representation of the protective cover a view from the opposite side, ie the tool side, in which the bearing neck is additionally shown, on which the protective hood is arranged with its support collar and as part of a housing-side bearing flange of the drive shaft, not shown, carrying the tool is interspersed.
3 and 4
a detail of the clamping collar, over which the support collar of the protective cover can be braced against the bearing neck, in a view and in a plan view according to arrow IV,
FIGS. 5 and 6
further embodiments in the Fig. 3 corresponding representation,
FIGS. 7 and 8
another embodiment in 3 and 4 corresponding representations,
Fig. 9
another embodiment in Fig. 3 corresponding representation,
Fig. 10
another embodiment in the Fig. 3 appropriate view, and
Fig. 11
a section XI in Fig. 10 corresponding representation of another solution for rotatable, but axially fixed position support of the screw shaft against a exciting.

In den Fig. 1 und 2 ist die Schutzhaube 1 einer als Winkelschleifmaschine ausgebildeten Handwerkzeugmaschine dargestellt, von der in Fig. 2 nur der gehäuseseitige Lagerflansch 2 gezeigt ist, der von der nicht gezeigten, das über die Schutzhaube 1 teilweise abgedeckte Werkzeug tragenden Antriebswelle durchsetzt ist und der einen Lagerhals 3 aufweist, auf dem die Schutzhaube 1 über ihren sich axial, das heißt in Richtung der Achse 5 des Lagerhalses 3 sich erstreckenden, radial innen liegenden Stützbund 4 abgestützt ist.In the Fig. 1 and 2 the protective hood 1 of a hand-held power tool designed as an angle grinder is shown, from the in Fig. 2 only the housing-side bearing flange 2 is shown, which is penetrated by the drive shaft, not shown, which is partially covered by the protective cover 1 supporting tool and having a bearing neck 3, on which the protective cover 1 via its axially, that is in the direction of the axis. 5 the bearing neck 3 extending, radially inner support collar 4 is supported.

Entsprechend der Gestaltung der Schutzhaube 1 mit, bezogen auf die Anordnung am Werkzeug, benutzerseitig liegender, halbkreisförmiger Flanke 6 überdeckt auch der Stützbund 4 im Wesentlichen lediglich die eine Hälfte des Lagerhalses 3, wobei der Stützbund 4 sich in Richtung auf das Gehäuse der Werkzeugmaschine erstreckt, und damit entgegengesetzt zum über das Werkzeug auskragenden, radial außen zur Schutzhaube 1 vorgesehenen Schirmrand 7 der Schutzhaube 1.According to the design of the protective hood 1 with respect to the arrangement on the tool, the user side lying, semi-circular edge 6 also covers the support collar 4 substantially only one half of the bearing neck 3, wherein the support collar 4 extends in the direction of the housing of the machine tool, and thus opposite to the projecting over the tool, radially outside the protective cover 1 provided screen edge 7 of the protective hood. 1

Zur Festlegung der Schutzhaube 1 in verschiedenen Drehlagen zum Lagerhals 3 - entsprechend jeweils gegebenen Arbeitsbedingungen - dient eine im Ausführungsbeispiel als Spannband ausgebildete Spannschelle 8, die übergreifend zum Stützbund 4 den Lagerhals 3 umschließt und die an ihrem offenen Ende einander gegenüberliegende, sich radial erstreckende Spannenden 9, 10 aufweist, quer zu denen sich die Spannachse 11 einer Spannvorrichtung 16 erstreckt, wie sie in unterschiedlichen Ausgestaltungsformen anhand der Fig. 3 bis 11 erläutert wird.Laying down the guard 1 in different rotational positions of the bearing neck 3 - corresponding to each given working conditions - is used in the embodiment as a clamping band clamp 8, the bearing collar 3 surrounds the support collar 4 and the opposite at its open end, radially extending clamping ends. 9 , 10, transverse to which the clamping axis 11 of a clamping device 16 extends, as in different embodiments with reference to FIG Fig. 3 to 11 is explained.

Bei über die Spannschelle 8 zum Lagerhals 3 verspanntem Stützbund 4 ergibt sich grundsätzlich eine reibschlüssige Verbindung und Absicherung der jeweiligen Drehlage der Schutzhaube 1 zur Achse 5, wobei die entsprechenden Reibkräfte unter anderem von den über die Spannschelle 8 aufgebrachten Spannkräften abhängig sind. In Fig. 1 ist angedeutet, dass durch entsprechende Profilierungen in der Berührfläche zwischen dem Stützbund 4 und dem Lagerhals 3 zusätzlich eine formschlüssige Verdrehsicherung erreicht werden kann, wobei in Fig. 1 diesbezüglich lediglich eine seitens des Stützbundes 4 gegebene Profilierung 13 angedeutet ist, der ein nicht gezeigtes, entsprechendes Gegenprofil am Lagerhals 3 entspricht. Fig. 1 veranschaulicht weiter, dass die Spannschelle 8 ihrerseits im zum Stützbund 4 gegenüberliegenden Bereich zweckmäßigerweise mit wenigstens einer Aufdickung 14 versehen ist, der im Lagerhals 3 eine Vertiefung entspricht, über die bei muldenförmiger Gestaltung die Spannschelle 8 in ihrer Axiallage zum Lagerhals 3 gesichert werden kann. Ferner kann - zum Beispiel auch bei rinnenförmiger Gestaltung - über die Aufdickung 14 eine Begrenzung des Drehbereiches zwischen Spannschelle 8 und Schutzhaube 1 vorgenommen werden. Die Verdickung kann auch dazu dienen, zum Lagerhals 3 bei entsprechendem Gegenprofil eine Drehlage für die Spannschelle 8 vorzugeben und/oder eine radiale Abstützung der Spannschelle 8 außerhalb ihres Überdeckungsbereiches zum Stützbund 4 in einem der Höhe des Stützbundes 4 etwa entsprechenden Abstand zu erreichen.When clamped over the clamping collar 8 to the bearing neck 3 support collar 4 basically results in a frictional connection and hedging the respective rotational position of the guard 1 to the axis 5, wherein the corresponding frictional forces are dependent, inter alia, on the tension clamp 8 applied clamping forces. In Fig. 1 is indicated that by appropriate profiling in the contact surface between the support collar 4 and the bearing neck 3 in addition a positive rotation can be achieved, wherein in Fig. 1 In this regard, only one of the support collar 4 given profiling 13 is indicated, which corresponds to a not shown, corresponding counter-profile on the bearing neck 3. Fig. 1 illustrates further that the clamp 8 in turn in the opposite region of the support collar 4 is provided with at least one thickening 14 which corresponds to a recess in the neck 3, on the trough-shaped design, the clamp 8 can be secured in its axial position to the bearing neck 3. Furthermore, a limitation of the range of rotation between clamp 8 and protective cover 1 can be made via the thickening 14, for example, even in the case of a trough-shaped design. The thickening can also serve to specify the bearing neck 3 with a corresponding counter-profile a rotational position for the clamp 8 and / or to achieve a radial support of the clamp 8 outside their coverage area to the support collar 4 in a height of the support collar 4 approximately corresponding distance.

Ist lediglich eine reibschlüssige Verbindung zwischen dem Lagerhals 3 und dem Stützbund 4 im entsprechend verspannten Zustand gegeben, so bedarf es nur einer entsprechenden Absenkung der Spannkraft, um die Drehlage der Schutzhaube 1 zu verändern. Ist zusätzlich eine formschlüssige Verbindung, etwa in Form einer Profilierung als Well-, Rippen- oder Stufenprofil gegeben, so muss - zur Verdrehung - die Schutzhaube 1 in Richtung des Pfeiles 15 (Fig. 2) so weit vom Lagerhals 3 abgehoben werden, dass die Formschlusselemente außer Eingriff kommen. Dies bedeutet, dass die Spannschelle 8 über das zur Aufhebung der Reibschlussverbindung hinausgehende Maß entspannt, also geöffnet werden muss, damit der Formschluss aufgehoben und eine Verdrehung der Schutzhaube 1 zum Lagerhals 3 möglich wird.Is only a frictional connection between the bearing neck 3 and the support collar 4 given in accordance with the braced state, so it only requires a corresponding reduction in the clamping force to change the rotational position of the guard 1. Is additionally a positive connection, given in the form of a profiling as corrugated, rib or step profile, so must - for rotation - the protective cover 1 in the direction of arrow 15 (FIG. Fig. 2 ) are lifted so far from the bearing neck 3, that the interlocking elements are disengaged. This means that the clamping collar 8 has to be relaxed over the measure that is beyond the frictional connection, ie it must be opened, so that the positive connection is released and a rotation of the protective hood 1 to the bearing neck 3 becomes possible.

Unabhängig davon, inwieweit die Spannschelle 8 ihrerseits in Richtung auf ihre Spannlage vorgespannt ausgebildet ist, inwieweit also, bei gegebenenfalls entsprechender Vorspannung, die Spannschelle 8 aufgeweitet werden muss, um eine Verdrehung, bzw. einen Freigang und eine Verdrehung des Stützbundes 4 gegenüber dem Lagerhals 3 zur Einstellung einer jeweiligen Drehlage möglich zu machen, ist die Verdrehung bei der erfindungsgemäßen Lösung dadurch einfach und auch gezielt möglich, dass die Spannenden 9, 10 der Spannschelle 8 über die Spannvorrichtung 16 in Spannrichtung, also in Spann- und Öffnungsrichtung zwangsgekoppelt sind, so dass gezielt und schnell eine Drehlagenveränderung für die Schutzhaube 1 und eine Verriegelung in der jeweiligen Schutzlage vorgenommen werden kann.Regardless of the extent to which the clamp 8 is in turn biased towards its clamping position, to what extent so, if appropriate corresponding bias, the clamp 8 must be expanded to a rotation, or a clearance and a rotation of the support collar 4 relative to the bearing neck. 3 to make a respective rotational position possible, the rotation in the inventive solution by simple and targeted possible that the exciting 9, 10 of the clamp 8 are forcibly coupled via the clamping device 16 in the clamping direction, ie in the clamping and opening direction, so that targeted and quickly a rotational position change for the protective cover 1 and a lock in the respective protective layer can be made.

Eine erste Ausgestaltung einer solchen Spannvorrichtung 16 zeigen die Fig. 3 und 4, bei denen als Spannelement 17 eine Spannschraube 18 vorgesehen ist, die sich in Richtung der Spannachse 11 erstreckt und die die einander gegenüberliegenden Spannenden 9 und 10 durchsetzend verbindet. Die Spannschraube 18 weist einen Schaft 19 auf, der zum Spannende 10 über eine Gewindeverbindung 20 axial verstellbar verbunden ist, wobei die Gewindeverbindung 20 seitens des Spannendes 10 durch eine mit dem Spannende 10 verbundene Mutter oder einen ausgestellten Gewindehals gebildet ist. Das gegenüberliegende Spannende 9 weist für den Schaft 19 eine Durchgangsöffnung auf und es ist endseitig der Schraubkopf 21 vorgesehen, der über einen ausgestellten, insbesondere freigeschnittenen, laschenförmigen Abschnitt 22 des Spannendes 9 in Richtung auf seine Anlage zum Spannende 9 belastet und in Anlage zu diesem gehalten wird. Der Abschnitt 22 kann nach Art einer Federlasche gestaltet sein, so dass er beim Einsetzen der Spannschraube 18 in die Überdeckungslage zum Schraubkopf 21 einfedert. Durch die einerseits gegebene Längsverstellbarkeit der Spannschraube 18 zum Spannende 10 und die andererseits zum Spannende 9 axial lagefeste Positionierung des Schraubkopfes 21 kann durch Verdrehen der Spannschraube 18 die Spannschelle 8 nicht nur zusammengezogen, sondern auch aufgespreizt werden, so dass, je nach Art der Verbindung zwischen Stützbund 4 und Lagerhals 3, entweder die Reibung so weit herabgesetzt wird, dass ein Verdrehen der Schutzhaube 1 möglich ist, oder aber bei nicht nur reibschlüssiger, sondern auch formschlüssiger Verbindung zwischen Stützbund 4 und Lagerhals 3, der Stützbund 4 so weit vom Lagerhals 3 abgehoben werden kann, dass eine entsprechende Verstellung der Schutzhaube 1 möglich ist.A first embodiment of such a clamping device 16 show the 3 and 4 in which a clamping screw 18 is provided as the clamping element 17, which extends in the direction of the clamping axis 11 and connects the opposing clamping ends 9 and 10 by passing. The clamping screw 18 has a shaft 19 which is connected to the exciting end 10 via a threaded connection 20 axially adjustable, the threaded connection 20 is formed by the tension end 10 by a connected to the exciting 10 nut or a flared threaded neck. The opposite exciting 9 has for the shaft 19 has a through hole and it is the end of the screw head 21 is provided, which loaded via an issued, in particular cut, tab-shaped portion 22 of the exciting 9 in the direction of its investment to the exciting 9 and held in abutment with this becomes. The section 22 may be a kind of Federlasche be designed so that it springs when inserting the clamping screw 18 in the overlap position to the screw head 21. By the one hand given Längsverstellbarkeit the clamping screw 18 to the exciting end 10 and the other to the exciting 9 axially positional positioning of the screw head 21, the clamp 8 can not only be tightened by twisting the clamping screw 18, but also spread, so that, depending on the type of connection between Support collar 4 and neck 3, either the friction is reduced so much that a rotation of the protective cover 1 is possible, or at not only frictional, but also positive connection between the support collar 4 and bearing neck 3, the support collar 4 so far lifted from the bearing neck 3 can be that a corresponding adjustment of the protective cover 1 is possible.

Fig. 5 zeigt eine der Gestaltung gemäß Fig. 3 im Wesentlichen entsprechende Lösung, wobei hier aber das seitens des Schraubenkopfes 21 liegende Spannende 9 endseitig auslaufend über den Schraubkopf 21 eingeschlagen ist, also ein eingebogener, endseitiger Abschnitt 23 des Spannendes 9 den Schraubkopf 21 in seiner axialen Anlage zum Spannende 9 hält. Fig. 5 shows one of the design according to Fig. 3 essentially corresponding solution, but here lying on the part of the screw head 21 exciting 9 ends auslaufend is taken over the screw head 21, so a bent, end-side section 23 of the exciting 9 holds the screw head 21 in its axial abutment to the exciting 9.

Bei der Ausgestaltung gemäß Fig. 6 ist das anhand der Fig. 3 und 5 erläuterte Prinzip zur axialen Lagesicherung des Schraubkopfes 21 gegenüber dem Spannende 9 unter Verwendung eines zusätzlichen Haltelementes 24 realisiert, das nach Art einer Beilagscheibe zwischen Schraubkopf 21 und Spannende 9 liegt und bei in das Spannende 10 eingeschraubter Spannschraube 18 auch in dieser Zwischenlage gesichert ist. Das Halteelement 24 weist eine, oder auch mehrere, von seinem zwischen Schraubkopf 21 und Spannende 9 liegenden Scheibenteil 25 ausgehende Laschen 26 auf, die über den Schraubkopf 21 eingebogen sind, und dadurch den Schraubkopf 21 zum Scheibenteil 25 sichern. Weiter sind vom Scheibenteil 25 ausgehend zumindest eine, bevorzugt mehrere Laschen 27 vorgesehen, die zum Spannende seitlich übergreifend gegen dieses abgestützt sind. Gegebenenfalls können die Laschen 27 auch gegenüberliegend zum Spannkopf 21 auf das Spannende 9 auslaufend eingeschlagen sein, so dass unabhängig von der Verspannung der Spannschraube 18 eine Lagesicherung derselben gegenüber dem Spannende 9 erreichbar ist. Die Lage und Ausbildung der Laschen 26, 27 in Fig. 6 ist zwar im Rahmen der Erfindung bevorzugt, aber nur beispielhaft im Hinblick auf die angestrebte Funktion.In the embodiment according to Fig. 6 is that on the basis of Fig. 3 and 5 explained principle for securing the axial position of the screw head 21 relative to the exciting 9 realized using an additional support member 24 which is in the manner of a washer between the screw head 21 and exciting 9 and secured in the exciting 10 screwed clamping screw 18 is also secured in this intermediate position. The holding element 24 has one, or more, from its lying between the screw head 21 and exciting 9 disc part 25 outgoing tabs 26 which are inflected over the screw head 21, and thereby secure the screw head 21 to the disc part 25. Further, starting from the disk part 25, at least one, preferably a plurality of tabs 27 are provided, which are laterally supported over the latter for exciting purposes. Optionally, the tabs 27 may also be taken to run counter to the chuck 21 on the exciting 9, so that regardless of the tension of the clamping screw 18 a position securing the same with respect to the exciting 9 is achievable. The location and formation of the flaps 26, 27 in Fig. 6 Although preferred within the scope of the invention, but only by way of example with regard to the desired function.

Fig. 7 und 8 veranschaulichen eine weitere Lösung einer Spannvorrichtung 16 mit Spannschraube 18, wobei die Spannschraube 18 wiederum einen mit Gewinde versehenen Schaft 19 und einen Schraubkopf 21 aufweist und wobei anschließend an den Schraubkopf 21 der Schaft 19 einen Hinterschnitt 28 aufweist, gebildet durch eine Ringnut 29 im Schaft 19. Zu dieser korrespondiert, als Durchstecköffnung für den Schaft 19, im Spannende 9 eine randoffene, von dessen stirnseitigem Ende ausgehende und im Querschnitt U-förmige Ausnehmung 30, die ein Einschieben des Spannendes 9 im Bereich der Ringnut 29, also über den im Durchmesser verringerten Schaftteil 31 der Spannschraube 18 ermöglicht. In ihrer eingeschobenen Lage kann die Spannschraube 18 zum Spannende 9 zum Beispiel dadurch gesichert werden, dass, wie in Fig. 8 gezeigt, die die Ausnehmung 30 seitlich begrenzenden Schenkel 32, 33 zusammengebogen werden. In entsprechender Weise kann eine Lagefixierung auch bei entsprechend federnder Nachgiebigkeit der Schenkel 32, 33 erreicht werden, insbesondere wenn die Ausnehmung 30 an ihrem inneren Ende eine dem Querschnitt des Schaftes 19 im Bereich der Hinterschneidung 28 entsprechende Aufweitung aufweist. FIGS. 7 and 8 illustrate another solution of a clamping device 16 with clamping screw 18, wherein the clamping screw 18 in turn has a threaded shaft 19 and a screw head 21 and wherein subsequent to the screw head 21 of the shaft 19 has an undercut 28 formed by an annular groove 29 in the shaft 19th To this corresponds, as an insertion opening for the shaft 19, in the exciting 9 an open-edged, emanating from its frontal end and in cross-section U-shaped recess 30, the insertion of the exciting end 9 in the region of the annular groove 29, so reduced over the diameter Shank portion 31 of the clamping screw 18 allows. In its retracted position, the clamping screw 18 can be secured to the exciting 9, for example, that, as in Fig. 8 shown, the recess 30 laterally bounding legs 32, 33 are bent together. In a corresponding manner, a positional fixation can be achieved even with corresponding resilient resilience of the legs 32, 33, in particular if the recess 30 has at its inner end a corresponding to the cross section of the shaft 19 in the region of the undercut 28 expansion.

Fig. 9 veranschaulicht eine weitere Ausführungsform, bei der die axiale Lage der Spannschraube 18 zum Spannende 9 dadurch festgelegt ist, dass bezogen auf das Spannende 9 gegenüberliegend zum Schraubkopf 21 der Schaft 19 einen nutförmigen Hinterschnitt 34 aufweist, in den als Widerlager 35 eine geschlitzte Scheibe oder dergleichen eingesetzt wird. Die das Widerlager 35 bildende Scheibe ist in diesem Ausführungsbeispiel in einem axialen Abstand zum Schraubkopf 21 angeordnet, der größer als die Dicke des Spannendes 9, so dass über den Schraubkopf 21 und das Widerlager 25 die Spannschraube 18 mit gewissem axialen Spiel zum Spannende 9 festgelegt ist. Fig. 9 illustrates a further embodiment in which the axial position of the clamping screw 18 is fixed to the exciting 9, that with respect to the exciting 9 opposite to the screw head 21 of the shaft 19 has a groove-shaped undercut 34, in the abutment 35 is a slotted disc or the like becomes. The disc forming the abutment 35 is arranged in this embodiment at an axial distance from the screw head 21, which is greater than the thickness of the tension end 9, so that via the screw head 21 and the abutment 25, the clamping screw 18 is set with some axial play to exciting 9 ,

Die vorbeschriebenen Ausführungsformen gehen sämtlich davon aus, dass zum Spannende 9 der Schraubkopf 21 benachbart liegt, somit das Spannende 9 ein schraubkopfseitiges Spannende bildet, zu dem gegenüberliegend ein gewindeseitiges Spannende 10 vorgesehen ist. Dass im Rahmen der Erfindung auch eine Umkehrung dieser Verhältnisse unter Beibehalt der erfindungsgemäßen Vorteile möglich ist, veranschaulichen die Fig. 10 und 11. So zeigt Fig. 10 zum Schraubkopf 21 benachbart ein Spannende 40 einer Spannschelle 38, zu dem als Spannelement 17 die Spannschraube 18 über eine Gewindeverbindung 36 axial verstellbar ist, wobei die Gewindeverbindung 36 durch ein in das Spannende 40 eingeschnittenes Gewinde gebildet ist oder, als weitere Möglichkeit, eine zum Spannende 40 angesetzte und mit dem Spannende 40 verbundenen Mutter vorgesehen ist.The above-described embodiments all assume that the exciting 9, the screw head 21 is adjacent, thus the exciting 9 forms a schraubkopfseitiges exciting, to the opposite a thread-side exciting end 10 is provided. That in the context of the invention, a reversal of these conditions while retaining the advantages of the invention is possible, illustrate the 10 and 11 , So shows Fig. 10 to the screw head 21 adjacent to an exciting 40 a clamp 38, to which as clamping element 17 the Clamping screw 18 via a threaded connection 36 is axially adjustable, wherein the threaded connection 36 is formed by a cut into the exciting 40 thread or, as a further possibility, provided for exciting 40 and connected to the exciting 40 nut is provided.

Zum gegenüberliegenden, hier mit 39 bezeichneten Spannende ist die dieser Spannvorrichtung 37 zugehörige Spannschraube 18 drehbar, aber axial lagefest abgestützt, veranschaulicht durch beiderseits des Spannendes 39 zum Gewindeschaft 19 axial lagefeste Widerlager, die beispielsweise durch in hinterschnittene Bereiche des Schaftes 19 eingreifende Stützscheiben 41, 42 oder dergleichen gebildet sein können.To the opposite, here designated 39 exciting the clamping device 37 associated clamping screw 18 is rotatably supported but axially fixed position, illustrated by both sides of the exciting 39 to the threaded shaft 19 axially positional abutment, for example, by engaging in undercut portions of the shaft 19 support plates 41, 42nd or the like may be formed.

Anstelle der vorgeschilderten axialen Festlegung des Gewindeschaftes 19 zum jeweiligen Spannende, so beispielsweise zum Spannende 39 über formschlüssig in diesen eingreifende Stützscheiben 41, 42 kann eine Festlegung auch über zum Gewindeschaft 19 verspannte, gegegebenenfalls gekonterte Muttern erfolgen.Instead of the above-described axial fixing of the threaded shank 19 to the respective exciting, so for example to the exciting 39 via positively engaging in these support plates 41, 42 can be made a fixation on the threaded shaft 19 braced, possibly countered nuts.

Eine entsprechende axial lagefeste, drehbare Abstützung der Spannschraube 18 kann auch gemäß Fig. 11 gestaltet sein, wobei in dieser Lösung als zum Spannende 39 ausgestellter Abschnitt 45 eine Lasche 43 vorgesehen ist, die einen Endanschlag für das dem Kopf 21 gegenüberliegende Ende des Schaftes 19 bildet. Die axial lagefeste, gegebenenfalls mit gewissem Spiel erfolgende Zuordnung des Schaftes 19 der Schraube 18 zum Spannende 39 bedingt eine entsprechende Lagesicherung des Schaftes 19 zur Lasche 43, die über ein Widerlager 44 erfolgt, das dem Schaft 19 auf der vom Kopf 21 abgelegenen Seite zugeordnet ist und das beispielsweise wiederum durch eine in eine Nut des Schaftes 19 eingreifende Stützscheibe oder dergleichen gebildet ist.A corresponding axially fixed position, rotatable support of the clamping screw 18 can also according to Fig. 11 be designed, in which solution as the exciting 39 flared portion 45 a tab 43 is provided which forms an end stop for the head 21 opposite the end of the shaft 19. The axially positionally stable, possibly with a certain clearance attribution of the shank 19 of the screw 18 to the exciting 39 requires a corresponding securing position of the shaft 19 to the tab 43, which takes place via an abutment 44 which is associated with the shaft 19 on the side remote from the head 21 and which in turn is formed, for example, by a support disk or the like engaging in a groove of the shank 19.

Somit stehen die Fig. 10 und 11 als Beispiele für Ausgestaltungen, die in Umkehrung der Anordnungen gemäß Fig. 3 bis 9 im Rahmen der Erfindung liegen.Thus, the stand 10 and 11 as examples of embodiments which, in reversal of the arrangements according to Fig. 3 to 9 within the scope of the invention.

Claims (5)

  1. Portable power tool, in particular hand-held angle grinder machine, having a tool that is carried by a drive shaft passing through the bearing neck (3) and is partially covered by a protective hood (1) which has a support collar (4) sitting on the bearing neck (3) and which is intended to be fixed with respect to the bearing neck (3) via a surrounding clamp (8) which clamps the support collar (4) against the bearing neck (3) and the radial clamping ends (9, 10) of which, which are located opposite one another in the direction of a clamping axis (11), are connected together via a clamping device (16) that has a clamping element passing through the clamping ends (9, 10), the clamping ends being displaceable with respect to one another in a forcibly coupled manner both in the clamping direction and in the opening direction via said clamping element, and said clamping element being axially adjustable with respect to one of the clamping ends (10) via a threaded connection (20),
    characterized in that the clamping element (17) is in the form of a clamping bolt (18) which is supported in an axially fixed position with respect to the other of the clamping ends (9) in the direction of the clamping axis (11), such that the clamping bolt (18) is fixed with respect to the other clamping end (9), fixed in the direction of the clamping axis, by a portion, provided in the region of this clamping end (9), of the clamp (8).
  2. Portable power tool according to Claim 1,
    characterized in that the clamping bolt (18) is fixed by a section (22) of the clamp that projects with respect to the clamp (8).
  3. Portable power tool according to Claim 1,
    characterized in that the clamping bolt (18) is fixed by a curved-in, end section (23) of the clamp (8).
  4. Portable power tool according to Claim 2 or 3,
    characterized in that the clamping bolt (18) is supported, at its bolt head (21), against the clamping end (9) that is fixed in the direction of the clamping axis, by the projecting or curved-in section (22, 23) of the clamp (8).
  5. Portable power tool according to one of the preceding claims,
    characterized in that the clamping bolt (18) is supported, with respect to the clamping end (10) that is adjustable via the threaded connection (20), via a threaded neck that projects with respect to said clamping end (10).
EP11188526A 2008-03-31 2008-11-19 Hand tool machine, in particular manual angle grinder Active EP2428316B1 (en)

Applications Claiming Priority (2)

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DE200810000888 DE102008000888A1 (en) 2008-03-31 2008-03-31 Hand tool, in particular hand-held angle grinder
EP08873780A EP2276609B1 (en) 2008-03-31 2008-11-19 Hand machine tool, particularly manually guided angle grinder

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EP2428316A1 EP2428316A1 (en) 2012-03-14
EP2428316B1 true EP2428316B1 (en) 2013-03-06

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EP08873780A Active EP2276609B1 (en) 2008-03-31 2008-11-19 Hand machine tool, particularly manually guided angle grinder

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CN (1) CN101983115A (en)
DE (1) DE102008000888A1 (en)
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WO2012019342A1 (en) * 2010-08-11 2012-02-16 Bosch Power Tools (China) Co., Ltd. Portable angle grinder with improved protective guard
KR200452942Y1 (en) 2010-12-03 2011-03-29 이창엽 Dust cover for hand grinder
DE102012214834A1 (en) * 2012-08-21 2014-02-27 Robert Bosch Gmbh Guard device

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GB1278732A (en) * 1970-03-13 1972-06-21 Kabel Metallwerke Ghh Mounting clamp for securing a waveguide of elliptical cross-section
SU716792A1 (en) * 1978-04-07 1980-02-25 Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Механизированного И Ручного Строительно-Монтажного Инструмента, Вибраторов И Строительно-Отделочных Машин Vibration-insulated hand-operated tool
DE3919649A1 (en) * 1989-06-16 1990-12-20 Bosch Gmbh Robert Quick adjusting guard for angle grinder - has clamping ring secured by stud with left and right threaded ends
US6464573B1 (en) 2000-06-30 2002-10-15 Porter-Cable Corporation Guard attachment system with knurled clamp ring
DE102004034441A1 (en) 2004-07-16 2006-02-16 Narex Česká Lípa a.s. Hand tool, in particular angle grinder
FR2884563B1 (en) * 2005-04-13 2011-03-18 Caillau Ets CLAMPING DEVICE WITH REINFORCED CLAMPING EARS
DE102006022386A1 (en) * 2006-05-12 2007-11-15 Robert Bosch Gmbh Protective hood for a hand tool and hand tool with protective hood

Also Published As

Publication number Publication date
WO2009121432A1 (en) 2009-10-08
EP2276609A1 (en) 2011-01-26
EP2428316A1 (en) 2012-03-14
CN101983115A (en) 2011-03-02
RU2010144312A (en) 2012-05-10
RU2502589C2 (en) 2013-12-27
DE102008000888A1 (en) 2009-10-01
EP2276609B1 (en) 2013-02-27
DE102008000888A8 (en) 2010-06-17

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