EP1965949B1 - Protective hood with clamping device - Google Patents

Protective hood with clamping device Download PDF

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Publication number
EP1965949B1
EP1965949B1 EP06819248A EP06819248A EP1965949B1 EP 1965949 B1 EP1965949 B1 EP 1965949B1 EP 06819248 A EP06819248 A EP 06819248A EP 06819248 A EP06819248 A EP 06819248A EP 1965949 B1 EP1965949 B1 EP 1965949B1
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EP
European Patent Office
Prior art keywords
rotation
protective hood
hood according
clamping ring
locking
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EP06819248A
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German (de)
French (fr)
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EP1965949A1 (en
Inventor
Sinisa Andrasic
Cornelius Boeck
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1965949A1 publication Critical patent/EP1965949A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • 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 protective hood for a tool according to the preamble of claim 1.
  • Protective hoods for tools with a rotary tool such as angle grinder
  • Such protective hoods have a covering area covering the rotary tool and a rotary tool releasing area.
  • the overlap area serves to protect the operator from material removal and flying sparks as well as from the parts of bursting rotary tools, such as grinding wheels.
  • the protective hood In order for the rotary tool release area, depending on the field of application of the tool and working position of the operator, to be in a favorable position relative to the workpiece to be machined, it is known to design the protective hood so that it can be mounted in different angular positions relative to the tool. For this purpose, designed as a clamping ring clamping devices for attachment to a machine neck of the tools are known.
  • a protective hood for a hand tool with a rotary tool with a designed as a clamping ring clamping device for attachment to a machine neck of the tool, and with a rotation for fixing the angular position of the protective cover relative to the tools proposed in the non-depositing on the clamping ring to form the rotation at least one, with an anti-rotation counter element of the machine neck cooperable anti-rotation element is arranged.
  • an anti-rotation on the clamping ring itself results.
  • Cooperative means that the operator, a compound, in particular an operative connection can be made.
  • the anti-rotation element is designed as an increase and the anti-rotation counter element as a recess. This results in a clear assignment, for example by latching.
  • the anti-rotation element as a recess and the anti-rotation counter element as an increase. It results in just such a clear assignment as above, but with reverse geometry.
  • the clamping ring as an open clamping ring.
  • the chip ring is not self-contained, but has an opening for change in size. This opening can be closed by a closing device, for example by a screw connection and / or by a lever mechanism, for the purpose of fastening the protective hood to the machine neck.
  • the clamping ring is at least partially formed as a clamping band.
  • tension band is meant a substantially elastic or resilient embodiment, for example in an embodiment as a band or leaf spring or as a reversibly deformable sheet metal part or in a similar manner. This results in an always identical shape of a region of the clamping ring, regardless of whether it is open or closed, and a shape variable, namely designed as a clamping band.
  • a further preferred embodiment provides that the clamping ring has a lever clamping device.
  • a lever clamping device is essentially one in which a lever is articulated on one end region of the preferably open clamping ring, with an axis of rotation of the lever, and wherein in the region of the lever a further axis exists, in the region of which the other end of the clamping ring is articulated, so that when the lever is opened, the clamping device is opened and the closing device is closed when the lever is closed.
  • the clamping ring has a spring element on its inner wall.
  • the spring element is a leaf or bow spring.
  • the spring width of the spring element is less than the ring height of the clamping ring. This means that the Federte of the spring element is smaller than the ring height of the clamping ring in the axial direction. This causes the spring is not the spring force of the full width of the clamping ring, but only in a region thereof is effective.
  • the spring element can be cooperated with recesses formed on the machine neck and / or at least one annular groove.
  • the machine neck has recesses and / or an annular groove into which the spring element engages when the tensioning device is correctly positioned.
  • the anti-rotation element is trapezoidal.
  • Trapezoidal means that the anti-rotation element has the shape of a Trapezzahnes in cross section. In this way, a simple locking or locking in the corresponding anti-rotation counter-element can be achieved, with a twisting With a loose clamping ring a slight exiting and sliding of the anti-rotation element can be done in the anti-rotation locking element.
  • the anti-rotation element is trapezoidal shaped on one side. In this way it can be accomplished that the protective hood is easily rotatable in one direction with the clamping ring open, whereas in the other direction preferably a blocking effect occurs. Again, a slight slipping in and out is guaranteed in or out of the corresponding (s) anti-rotation counter element.
  • a preferred embodiment of the invention provides that the unilaterally trapezoidal-shaped formation has a steep section, which is aligned with the opening. This means that the flat rising part of the Trapezzahnes is oriented to the side facing away from the opening, the steep section but towards the opening. This ensures by the thus predetermined force curve that even with strong vibrations, the strap does not loosen and in particular the anti-rotation element can not slip out of the anti-rotation element, which would lead to a displacement of the guard and at worst to a release.
  • the arrangement can also be mirror-image (steep section away from the opening oriented); but this is not quite as advantageous.
  • a further preferred embodiment provides that on the inside of the clamping ring several anti-rotation elements of different increase are present. This means that several of the aforementioned anti-rotation elements in different axial extent in the clamping ring (to the imaginary axis of the rotary tool) are present.
  • a particularly preferred embodiment has a plurality of anti-rotation elements of different elevation, which have a rising height profile. This means that the height / extent of each anti-rotation element in the clamping ring is greater than the height of the preceding anti-rotation element. This results in an increasing height geometry of the anti-rotation elements, which allows a slight intentional displacement with only a small opening of the clamping ring, but nevertheless ensures a safe and complete engagement.
  • the anti-rotation element is cylindrical. It may be this standing on the clamping ring cylinder, ie those whose axis is perpendicular to the inner wall of the clamping ring, thus in the radial direction, or even those, for example, lying partially sunk in the axial direction. It is only important that a clear and secure engagement occurs when closing the clamping ring and a clear position assignment in a certain angular position.
  • the invention further comprises a tool with a machine neck, wherein the machine neck has at least one anti-rotation counter element, which cooperates with at least one anti-rotation element.
  • FIG. 1 shows a protective hood 1 for a hand tool, not shown.
  • the protective hood has a hood body 2, which consists of an axial wall 3, with the one piece, a collar 4 on the inner peripheral side and a collar 5 are formed on the outer peripheral side in one piece.
  • the hood body 2 forms approximately a semicircular ring segment, wherein the collar 4, the axial wall on the inner peripheral side and the collar 5, the axial wall outer peripheral side limited.
  • the collar 4 and the collar 5 are angled in opposite directions from the axial wall 3, wherein they each include approximately a 90 ° angle.
  • the collar 4 is encompassed by a tensioning device 6.
  • the clamping device 6 consists of a clamping ring 7 and a clamping band 8, wherein the clamping ring 7 is formed as an open clamping ring 9.
  • the clamping ring 7 has an opening 10, at one end of a bearing block 11 is mounted, in the bridging of the opening 10, a clamping pin 12 is inserted, which is formed at the opposite end of the clamping ring 7, which is designed as a clamping band 8, via a perpendicular to its longitudinal axis inserted into it transverse pin 13 is frictionally connected to an actuating handle 14.
  • the actuating handle 14 is articulated in a second bearing block 15 by means of a second transverse pin 16 at the opening end 17 of the clamping band 8.
  • the actuating handle 14 forms, together with the bearing block 11, the clamping pin 12, the transverse pin 13, the second bearing block 15 and the second transverse pin 16 via the opening 10, a lever clamping device 18.
  • the clamping ring 7 has in the region of the clamping band 8 non-pivotable anti-rotation elements 19. These are formed in the form of a unilateral Trapezzahnes 20 as an increase 25 on the inside of the clamping band 8, which means that the cross section of each anti-rotation element 19 forms a unilateral trapezoidal tooth 20, wherein the oblique side 21 of each unilateral Trapezzahnes 20 of the opening 10 is oriented away, so that the steep portion 22 of each unilateral trapezoidal tooth 20 is oriented in the direction of the opening 10.
  • a spring element 23 is further formed, the longitudinal extent of which rises along the inner shell wall 26 of the tension band 8.
  • the width b of the spring element 23 (narrow side) is less than the height h of the tension band 8.
  • the arrangement of the spring element 23 in the region of different axial extent of the height h of the clamping ring 8 can be together with an annular groove, not shown, or other interventions on the Machine neck not shown form a coding system that allows the use of the guard 1 only with such machines for the specification (in particular maximum speed), the guard is built and approved.
  • a spring element 23 may also be provided in one piece with the strap 8 device connected in the form of a nose 24. It is only important here that a defined arrangement of a certain width b as axial extension having, nose-shaped element in the height h of the clamping ring 8 takes place in such a way that a defined assignment to a counter element on the machine neck is possible.
  • the radius of the clamping ring is extended, so that the clamping ring with the protective cover 1 can be slipped over the machine neck, not shown.
  • the operating handle 14 is to close, whereby the radius of the Clamping ring is reduced again, and the anti-rotation elements 19 engage in the anti-rotation counter-elements of the machine neck, not shown, and the spring element 23 and the nose 24 in a non-illustrated counter element, such as an annular groove, not shown on the machine neck.
  • a regulating screw not shown here in the region of the clamping pin 12 and preferably of the bearing block 11 may be provided, for example by execution of the clamping pin 12 as a threaded pin / screw. As a result, a fine adjustment of the clamping diameter is possible.
  • the protective cover After opening the clamping ring 7 (namely by pressing the operating handle 14) to bring in different angular positions relative to the tools, this being possible in such an area, as the anti-rotation elements 19 correspond to the anti-rotation counter-elements not shown.
  • the anti-rotation elements 19 can not engage, so that a closing of the clamping ring is not possible and the guard can not be fixed in such a faulty manner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Sawing (AREA)

Abstract

The invention relates to a protective hood for a portable tool with a rotary tool, having a clamping device designed as a clamping ring for fastening to a machine neck of the portable tool, and having an anti-rotation locking means for fixing the angular position of the protective hood relative to the portable tool. It is proposed that at least one rotation-locking element (19) which can interact with a rotation-locking element (19) of the machine neck be arranged in a fixed position on the clamping ring (7) for forming the anti-rotation locking means. A portable tool having such a protective hood (1) is also proposed.

Description

Die Erfindung betrifft eine Schutzhaube für ein Handwerkszeug nach dem Oberbegriff des Anspruchs 1.The invention relates to a protective hood for a tool according to the preamble of claim 1.

Stand der TechnikState of the art

Schutzhauben für Handwerkszeuge mit einem Rotationswerkzeug, beispielsweise Winkelschleifer, sind bekannt. Solche Schutzhauben weisen einen das Rotationswerkzeug überdeckenden Überdeckungsbereich und einen Rotationswerkzeugfreigabebereich auf. Der Überdeckungsbereich dient dem Schutz des Bedieners vor Materialabtrag und Funkenflug sowie vor den Teilen berstender Rotationswerkszeuge, beispielsweise von Schleifscheiben. Damit der Rotationswerkzeugfreigabebereich, je nach Anwendungsbereich des Handwerkszeugs und Arbeitshaltung des Bedieners, in einer günstigen Lage zu dem zu bearbeitenden Werkstück liegt, ist es bekannt, die Schutzhaube so auszugestalten, dass sie in unterschiedlichen Winkelpositionen relativ zum Handwerkszeug angebracht werden kann. Hierzu sind als Spannring ausgebildete Spannvorrichtungen zur Befestigung an einem Maschinenhals des Handwerkszeugs bekannt. In DE 102 59 520 ist ferner eine Verdrehsicherung zur Festlegung der Winkelposition der Schutzhaube relativ zum Handwerkszeug beschrieben. Hieran ist nachteilig, dass die Spannvorrichtung so ausgestaltet ist, dass zum Lösen und zum Anbringen der Schutzhaube auf dem Maschinenhals des Handwerkszeugs ein Werkzeug benötigt wird, während zur Festlegung der Winkelposition der Schutzhaube eine Hebelspannvorrichtung mit einer an einem Spannhebel angeordneten Sperrklinke als Verdrehsicherung vorgesehen ist. Die Handhabung einer solchen Schutzhaube ist aufwendig.Protective hoods for tools with a rotary tool, such as angle grinder, are known. Such protective hoods have a covering area covering the rotary tool and a rotary tool releasing area. The overlap area serves to protect the operator from material removal and flying sparks as well as from the parts of bursting rotary tools, such as grinding wheels. In order for the rotary tool release area, depending on the field of application of the tool and working position of the operator, to be in a favorable position relative to the workpiece to be machined, it is known to design the protective hood so that it can be mounted in different angular positions relative to the tool. For this purpose, designed as a clamping ring clamping devices for attachment to a machine neck of the tools are known. In DE 102 59 520 Furthermore, an anti-rotation device for fixing the angular position of the protective hood relative to the tool is described. This has the disadvantage that the clamping device is designed so that for releasing and attaching the guard on the machine neck of the tool a tool is required while defining the angular position of the protective hood, a lever clamping device is provided with a clamping lever arranged on a pawl as rotation. The handling of such a protective cover is expensive.

Vorteile der ErfindungAdvantages of the invention

Dem gegenüber wird eine Schutzhaube für ein Handwerkszeug mit einem Rotationswerkzeug, mit einer als Spannring ausgebildeten Spannvorrichtung zur Befestigung an einem Maschinenhals des Handwerkszeugs, und mit einer Verdrehsicherung zur Festlegung der Winkelposition der Schutzhaube relativ zum Handwerkszeug vorgeschlagen, bei der unverlagerbar am Spannring zur Bildung der Verdrehsicherung mindestens ein, mit einem Drehsicherungsgegenelement des Maschinenhalses zusammenwirkbares Drehsicherungselement angeordnet ist. Durch diese Ausführung ergibt sich eine Verdrehsicherung am Spannring selbst. Zusammenwirkbar bedeutet, dass vom Bediener eine Verbindung, insbesondere eine Wirkverbindung, hergestellt werden kann.In contrast, a protective hood for a hand tool with a rotary tool, with a designed as a clamping ring clamping device for attachment to a machine neck of the tool, and with a rotation for fixing the angular position of the protective cover relative to the tools proposed in the non-depositing on the clamping ring to form the rotation at least one, with an anti-rotation counter element of the machine neck cooperable anti-rotation element is arranged. By this design, an anti-rotation on the clamping ring itself results. Cooperative means that the operator, a compound, in particular an operative connection can be made.

In einer weiteren Ausführungsform ist vorgesehen, dass das Drehsicherungselement als Erhöhung und das Drehsicherungsgegenelement als Vertiefung ausgebildet ist. Hierdurch erfolgt eine eindeutige Zuordnung, beispielsweise durch Einrastung.In a further embodiment it is provided that the anti-rotation element is designed as an increase and the anti-rotation counter element as a recess. This results in a clear assignment, for example by latching.

In einer weiteren Ausführungsform ist vorgesehen, das Drehsicherungselement als Vertiefung und das Drehsicherungsgegenelement als Erhöhung auszubilden. Es ergibt sich eine eben solche eindeutige Zuordnung wie vorstehend, allerdings mit umgekehrter Geometrie.In a further embodiment, it is provided to form the anti-rotation element as a recess and the anti-rotation counter element as an increase. It results in just such a clear assignment as above, but with reverse geometry.

In einer weiteren Ausführungsform ist vorgesehen, den Spannring als offenen Spannring auszubilden. Damit ist gemeint, dass der Spanring nicht in sich geschlossen ist, sondern eine Öffnung zur Umfangsveränderung aufweist. Diese Öffnung kann zum Zwecke der Befestigung der Schutzhaube am Maschinenhals durch eine Schließungsvorrichtung, beispielsweise durch eine Verschraubung und/oder durch einen Hebelmechanismus, geschlossen werden.In a further embodiment, it is provided to form the clamping ring as an open clamping ring. By that is meant that the chip ring is not self-contained, but has an opening for change in size. This opening can be closed by a closing device, for example by a screw connection and / or by a lever mechanism, for the purpose of fastening the protective hood to the machine neck.

In einer weiteren Ausführungsform ist vorgesehen, dass der Spannring zumindest abschnittsweise als Spannband ausgebildet ist. Unter Spannband ist eine im Wesentlichen elastische oder federnde Ausführungsform gemeint, beispielsweise in einer Ausführung als Band- oder Blattfeder oder als reversibel verformbares Blechteil oder in ähnlicher Weise. Es ergibt sich damit eine stets formgleiche Ausformung eines Bereiches des Spannrings, unabhängig davon, ob dieser geöffnet oder geschlossen ist, und eine formvariable, nämlich die als Spannband ausgebildete.In a further embodiment it is provided that the clamping ring is at least partially formed as a clamping band. Under tension band is meant a substantially elastic or resilient embodiment, for example in an embodiment as a band or leaf spring or as a reversibly deformable sheet metal part or in a similar manner. This results in an always identical shape of a region of the clamping ring, regardless of whether it is open or closed, and a shape variable, namely designed as a clamping band.

Eine weitere bevorzugte Ausführungsform sieht vor, dass der Spannring eine Hebelspannvorrichtung aufweist. Eine Hebelspannvorrichtung ist im Wesentlichen eine solche, bei der an einem Endbereich des vorzugsweise offenen Spannringes ein Hebel angelenkt ist, mit einer Drehachse des Hebels, und wobei im Bereich des Hebels eine weitere Achse existiert, in deren Bereich das andere Ende des Spannrings angelenkt ist, so dass beim Öffnen des Hebels die Spannvorrichtung geöffnet und bei Schließen des Hebels die Spannvorrichtung geschlossen wird.A further preferred embodiment provides that the clamping ring has a lever clamping device. A lever clamping device is essentially one in which a lever is articulated on one end region of the preferably open clamping ring, with an axis of rotation of the lever, and wherein in the region of the lever a further axis exists, in the region of which the other end of the clamping ring is articulated, so that when the lever is opened, the clamping device is opened and the closing device is closed when the lever is closed.

In einer weiteren bevorzugten Ausführungsform ist vorgesehen, dass der Spannring an seiner Innenwandung ein Federelement aufweist. Mit einem solchen Federelement wird bei Öffnen der Spannvorrichtung erreicht, dass sich die Innenfläche des Spannrings von der Außenfläche des Maschinenhalses durch die Federkraft des Federelementes abhebt, da das am Spannring angeordnete Federelement die Außenwandung des Maschinenhalses mit Federkraft beaufschlagt und somit den Spannring von demselben abdrückt.In a further preferred embodiment it is provided that the clamping ring has a spring element on its inner wall. With such a spring element is achieved when opening the clamping device, that the inner surface of the clamping ring from the outer surface of the machine neck lifts by the spring force of the spring element, since the clamping ring arranged on the spring element acts on the outer wall of the machine neck with spring force and thus suppresses the clamping ring of the same.

In einer weiteren bevorzugten Ausführungsform ist vorgesehen, dass das Federelement eine Blatt- oder Bogenfeder ist. Durch diese Ausgestaltung, vorzugsweise mit einem Konvexbogen in Richtung des Maschinenhalses, wird eine einfach herzustellende und hochwirksame Ausführung des Federelements vorgeschlagen.In a further preferred embodiment it is provided that the spring element is a leaf or bow spring. By this embodiment, preferably with a convex arc in the direction of the machine neck, a simple to produce and highly effective design of the spring element is proposed.

In einer weiteren bevorzugten Ausführungsform ist vorgesehen, dass die Federbreite des Federelements geringer als die Ringhöhe des Spannrings ist. Damit ist gemeint, dass die Federbereite des Federelements kleiner als die Ringhöhe des Spannrings in Axialrichtung ist. Dadurch wird bewirkt, dass die Feder nicht die volle Breite des Spannrings federkraftbeaufschlagt, sondern nur in einem Bereich derselben wirksam ist.In a further preferred embodiment, it is provided that the spring width of the spring element is less than the ring height of the clamping ring. This means that the Federbereite of the spring element is smaller than the ring height of the clamping ring in the axial direction. This causes the spring is not the spring force of the full width of the clamping ring, but only in a region thereof is effective.

In einer weiteren besonders bevorzugten Ausführungsform ist vorgesehen, dass das Federelement in mit am Maschinenhals ausgebildeten Vertiefungen und/oder mindestens einer Ringnut zusammenwirkbar ist. Damit ist gemeint, dass der Maschinenhals Vertiefungen und/oder eine Ringnut aufweist, in die das Federelement bei korrekter Positionierung der Spannvorrichtung eingreift. Auf diese Weise lässt sich eine Kodierung ausbilden, die bestimmte Zuordnungen von mit der Spannvorrichtung ausgerüsteten Schutzhauben zu bestimmten Maschinentypen zulässt, beispielsweise, um zu verhindern, dass eine Schutzhaube mit einer Maschine betrieben wird, die zwar einen gleichen oder ganz ähnlichen Maschinenhals aufweist, aber eine höhere Drehzahl, und für die die Schutzhaube nicht zugelassen wäre.In a further particularly preferred embodiment, it is provided that the spring element can be cooperated with recesses formed on the machine neck and / or at least one annular groove. By this is meant that the machine neck has recesses and / or an annular groove into which the spring element engages when the tensioning device is correctly positioned. In this way, a coding can be formed which allows certain assignments of clamping devices equipped with the clamping device to certain types of machines, for example, to prevent that a protective hood is operated with a machine that has a same or very similar machine neck, but a higher speed, and for which the guard would not be allowed.

In einer bevorzugten Ausführungsform ist vorgesehen, dass das Drehsicherungselement trapezzahnförmig ausgebildet ist. Trapezzahnförmig meint, dass das Drehsicherungselement im Querschnitt die Form eines Trapezzahnes aufweist. Auf diese Weise lässt sich eine einfache Verrastung oder Verriegelung in dem entsprechenden Drehsicherungsgegenelement erreichen, wobei bei einem Verdrehen mit gelöstem Spannring ein leichtes Aus- und Eingleiten des Drehsicherungselements in das Drehsicherungsgegenelement erfolgen kann.In a preferred embodiment it is provided that the anti-rotation element is trapezoidal. Trapezoidal means that the anti-rotation element has the shape of a Trapezzahnes in cross section. In this way, a simple locking or locking in the corresponding anti-rotation counter-element can be achieved, with a twisting With a loose clamping ring a slight exiting and sliding of the anti-rotation element can be done in the anti-rotation locking element.

In einer weiteren Ausführungsform ist vorgesehen, dass das Drehsicherungselement einseitig trapezzahnförmig ausgebildet ist. Auf diese Weise lässt sich bewerkstelligen, dass die Schutzhaube bei geöffnetem Spannring leicht in eine Richtung drehbar ist, wohingegen in die andere Richtung bevorzugt eine Sperrwirkung eintritt. Auch hier ist ein leichtes Ein- beziehungsweise Ausgleiten in das beziehungsweise aus dem entsprechende(n) Drehsicherungsgegenelement gewährleistet.In a further embodiment it is provided that the anti-rotation element is trapezoidal shaped on one side. In this way it can be accomplished that the protective hood is easily rotatable in one direction with the clamping ring open, whereas in the other direction preferably a blocking effect occurs. Again, a slight slipping in and out is guaranteed in or out of the corresponding (s) anti-rotation counter element.

Eine bevorzugte Ausführungsform der Erfindung sieht vor, dass die einseitig trapezzahnförmige Ausbildung einen Steilabschnitt aufweist, der zur Öffnung hin ausgerichtet ist. Dies bedeutet, dass der flach ansteigende Teil des Trapezzahnes auf die der Öffnung abgewandten Seite, der Steilabschnitt aber zur Öffnung hin orientiert ist. Dies sorgt durch den damit vorgegebenen Kräfteverlauf dafür, dass auch bei starken Vibrationen sich das Spannband nicht lockern und insbesondere das Drehsicherungselement nicht aus dem Drehsicherungsgegenelement ausgleiten kann, was zu einem Verschieben der Schutzhaube und schlimmstenfalls zu einem Lösen führen würde. Die Anordnung kann auch spiegelbildlich erfolgen (Steilabschnitt weg von der Öffnung orientiert); diese ist aber nicht ganz so vorteilhaft.A preferred embodiment of the invention provides that the unilaterally trapezoidal-shaped formation has a steep section, which is aligned with the opening. This means that the flat rising part of the Trapezzahnes is oriented to the side facing away from the opening, the steep section but towards the opening. This ensures by the thus predetermined force curve that even with strong vibrations, the strap does not loosen and in particular the anti-rotation element can not slip out of the anti-rotation element, which would lead to a displacement of the guard and at worst to a release. The arrangement can also be mirror-image (steep section away from the opening oriented); but this is not quite as advantageous.

Eine weitere bevorzugte Ausführungsform sieht vor, dass innenseitig am Spannring mehrere Drehsicherungselemente unterschiedlicher Erhöhung vorliegen. Dies bedeutet, dass mehrere der genannten Drehsicherungselemente in unterschiedlicher axialer Erstreckung in den Spannring (zur gedachten Achse des Rotationswerkzeuges) vorliegen.A further preferred embodiment provides that on the inside of the clamping ring several anti-rotation elements of different increase are present. This means that several of the aforementioned anti-rotation elements in different axial extent in the clamping ring (to the imaginary axis of the rotary tool) are present.

Eine besonders bevorzugte Ausführungsform weist mehrere Drehsicherungselemente unterschiedlicher Erhöhung auf, die ein ansteigendes Höhenprofil aufweisen. Dies bedeutet, dass die Höhe/Erstreckung eines jeden Drehsicherungselementes in den Spannring hinein größer ist als die Höhe des ihm vorhergehenden Drehsicherungselementes. Es ergibt sich damit eine ansteigende Höhengeometrie der Drehsicherungselemente, die ein leichtes gewolltes Verschieben bei nur geringer Öffnung des Spannringes zulässt, gleichwohl aber einen sicheren und vollständigen Eingriff gewährleistet.A particularly preferred embodiment has a plurality of anti-rotation elements of different elevation, which have a rising height profile. This means that the height / extent of each anti-rotation element in the clamping ring is greater than the height of the preceding anti-rotation element. This results in an increasing height geometry of the anti-rotation elements, which allows a slight intentional displacement with only a small opening of the clamping ring, but nevertheless ensures a safe and complete engagement.

In einer weiteren Ausführungsform ist vorgesehen, dass das Drehsicherungselement zylinderförmig ausgebildet ist. Es kann sich hierbei um auf dem Spannring stehende Zylinder, also um solche handeln, deren Achse senkrecht zur Innenwandung des Spannrings verläuft, mithin in Radialrichtung, oder auch um solche, die, beispielsweise teilweise versenkt liegend, in Axialrichtung verlaufen. Wichtig ist lediglich, dass ein eindeutiges und sicheres Einrasten bei Schließen des Spannrings und eine eindeutige Lagezuordnung in einer bestimmten Winkelposition erfolgt.In a further embodiment it is provided that the anti-rotation element is cylindrical. It may be this standing on the clamping ring cylinder, ie those whose axis is perpendicular to the inner wall of the clamping ring, thus in the radial direction, or even those, for example, lying partially sunk in the axial direction. It is only important that a clear and secure engagement occurs when closing the clamping ring and a clear position assignment in a certain angular position.

Die Erfindung umfasst ferner ein Handwerkszeug mit einem Maschinenhals, wobei der Maschinenhals mindestens ein Verdrehsicherungsgegenelement aufweist, das mit mindestens einem Drehsicherungselement zusammenwirkt. Auf diese Weise lässt sich einfach ein System von Handwerkszeugen und korrespondierenden Schutzhauben zusammenstellen, wobei unterschiedlichen Maschinentypen unterschiedliche Ausführungsformen von beispielsweise Federelementen, Drehsicherungselementen et cetera im Sinne der vorstehend beschriebenen Kodierungen entspricht.The invention further comprises a tool with a machine neck, wherein the machine neck has at least one anti-rotation counter element, which cooperates with at least one anti-rotation element. In this way, it is easy to assemble a system of hand tools and corresponding protective hoods, different machine types corresponding to different embodiments of, for example, spring elements, anti-rotation elements et cetera in the sense of the above-described codes.

Die Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.The invention will be explained in more detail with reference to drawings.

Es zeigt

Figur 1
eine Schutzhaube mit Spannvorrichtung.
It shows
FIG. 1
a protective hood with tensioning device.

Figur 1 zeigt eine Schutzhaube 1 für ein nicht dargestelltes Handwerkszeug. Die Schutzhaube weist einen Haubenkörper 2 auf, der aus einer Axialwand 3 besteht, mit der einstückig ein Bund 4 innenumfangsseitig sowie ein Kragen 5 außenumfangsseitig einstückig ausgebildet sind. Der Haubenkörper 2 bildet in etwa ein halbkreisförmiges Ringsegment aus, wobei der Bund 4 die Axialwand innenumfangsseitig und der Kragen 5 die Axialwand außenumfangsseitig begrenzt. Der Bund 4 und der Kragen 5 sind in entgegengesetzte Richtungen von der Axialwand 3 abgewinkelt, wobei sie jeweils näherungsweise einen 90°-Winkel einschließen. Der Bund 4 wird von einer Spannvorrichtung 6 umgriffen. Die Spannvorrichtung 6 besteht aus einem Spannring 7 und einem Spannband 8, wobei der Spannring 7 als offener Spannring 9 ausgebildet ist. Der Spannring 7 weist eine Öffnung 10 auf, an deren einem Ende ein Lagerbock 11 angebracht ist, in den zur Überbrückung der Öffnung 10 ein Spannstift 12 eingesetzt ist, der an dem gegenüberliegenden Ende des Spannrings 7, das als Spannband 8 ausgebildet ist, über einen senkrecht zu seiner Längsachse in ihn eingesetzten Querstift 13 mit einem Betätigungsgriff 14 kraftschlüssig verbunden ist. Der Betätigungsgriff 14 ist in einem zweiten Lagerbock 15 mittels eines zweiten Querstiftes 16 am öffnungsseitigen Ende 17 des Spannbandes 8 angelenkt. Der Betätigungsgriff 14 bildet zusammen mit dem Lagerbock 11, dem Spannstift 12, dem Querstift 13, dem zweiten Lagerbock 15 und dem zweiten Querstift 16 über die Öffnung 10 eine Hebelspannvorrichtung 18 aus. Der Spannring 7 weist im Bereich des Spannbandes 8 unverlagerbar Drehsicherungselemente 19 auf. Diese sind in der Form eines einseitigen Trapezzahnes 20 als Erhöhung 25 über der Innenseite des Spannbandes 8 ausgebildet, was bedeutet, dass der Querschnitt eines jedes Drehsicherungselementes 19 einen einseitigen Trapezzahn 20 ausbildet, wobei die Schrägseite 21 eines jeden einseitigen Trapezzahnes 20 von der Öffnung 10 weg orientiert ist, so dass der Steilabschnitt 22 eines jeden einseitigen Trapezzahnes 20 in Richtung der Öffnung 10 orientiert ist. Zusammen mit nicht dargestellten Drehsicherungsgegenelementen an dem nicht dargestellten Maschinenhals, in die die Drehsicherungselemente formschlüssig eingreifen können, bilden diese eine Verdrehsicherung, und, wenn die Anzahl der Drehsicherungsgegenelemente größer ist als die der Drehsicherungselemente, eine Winkelposition-Arretierung. An dem Spannband 8 ist ferner ein Federelement 23 ausgebildet, dessen Längserstreckung sich entlang der Innenmantelwand 26 des Spannbandes 8 erhebt. Die Breite b, des Federelements 23 (schmalseitig) ist hierbei geringer als die Höhe h des Spannbandes 8. Durch die Anordnung des Federelementes 23 im Bereich unterschiedlicher Axialerstreckung der Höhe h des Spannrings 8 lässt sich zusammen mit einer nicht dargestellten Ringnut oder anderen Eingriffen an dem nicht dargestellten Maschinenhals ein Codiersystem ausbilden, das die Verwendung der Schutzhaube 1 nur mit solchen Maschinen zulässt, für deren Spezifikation (insbesondere Höchstdrehzahl) die Schutzhaube gebaut und zugelassen ist. FIG. 1 shows a protective hood 1 for a hand tool, not shown. The protective hood has a hood body 2, which consists of an axial wall 3, with the one piece, a collar 4 on the inner peripheral side and a collar 5 are formed on the outer peripheral side in one piece. The hood body 2 forms approximately a semicircular ring segment, wherein the collar 4, the axial wall on the inner peripheral side and the collar 5, the axial wall outer peripheral side limited. The collar 4 and the collar 5 are angled in opposite directions from the axial wall 3, wherein they each include approximately a 90 ° angle. The collar 4 is encompassed by a tensioning device 6. The clamping device 6 consists of a clamping ring 7 and a clamping band 8, wherein the clamping ring 7 is formed as an open clamping ring 9. The clamping ring 7 has an opening 10, at one end of a bearing block 11 is mounted, in the bridging of the opening 10, a clamping pin 12 is inserted, which is formed at the opposite end of the clamping ring 7, which is designed as a clamping band 8, via a perpendicular to its longitudinal axis inserted into it transverse pin 13 is frictionally connected to an actuating handle 14. The actuating handle 14 is articulated in a second bearing block 15 by means of a second transverse pin 16 at the opening end 17 of the clamping band 8. The actuating handle 14 forms, together with the bearing block 11, the clamping pin 12, the transverse pin 13, the second bearing block 15 and the second transverse pin 16 via the opening 10, a lever clamping device 18. The clamping ring 7 has in the region of the clamping band 8 non-pivotable anti-rotation elements 19. These are formed in the form of a unilateral Trapezzahnes 20 as an increase 25 on the inside of the clamping band 8, which means that the cross section of each anti-rotation element 19 forms a unilateral trapezoidal tooth 20, wherein the oblique side 21 of each unilateral Trapezzahnes 20 of the opening 10 is oriented away, so that the steep portion 22 of each unilateral trapezoidal tooth 20 is oriented in the direction of the opening 10. Together with non-illustrated anti-rotation counter-elements on the machine neck, not shown, in which the anti-rotation elements can engage positively, they form an anti-rotation, and, if the number of anti-rotation counter-elements is greater than the anti-rotation elements, an angular position lock. On the tension band 8, a spring element 23 is further formed, the longitudinal extent of which rises along the inner shell wall 26 of the tension band 8. The width b of the spring element 23 (narrow side) is less than the height h of the tension band 8. The arrangement of the spring element 23 in the region of different axial extent of the height h of the clamping ring 8 can be together with an annular groove, not shown, or other interventions on the Machine neck not shown form a coding system that allows the use of the guard 1 only with such machines for the specification (in particular maximum speed), the guard is built and approved.

Anstelle eines Federelementes 23 kann auch eine einstückig mit dem Spannband 8 verbundene Vorrichtung in Form einer Nase 24 vorgesehen sein. Wichtig ist hierbei lediglich, dass eine definierte Anordnung eines eine bestimmte Breite b als Axialerstreckung aufweisenden, nasenförmigen Elementes im Bereich der Höhe h des Spannringes 8 dergestalt erfolgt, dass eine definierte Zuordnung zu einem Gegenelement an dem Maschinenhals möglich ist.Instead of a spring element 23 may also be provided in one piece with the strap 8 device connected in the form of a nose 24. It is only important here that a defined arrangement of a certain width b as axial extension having, nose-shaped element in the height h of the clamping ring 8 takes place in such a way that a defined assignment to a counter element on the machine neck is possible.

Bei Öffnen des Spannringes 7 durch Betätigen des Betätigungsgriffs 14 und dadurch Lösen/Lockern des Spannbandes 8 wird der Radius des Spannrings erweitert, so dass der Spannring mit der Schutzhaube 1 über den nicht dargestellten Maschinenhals gestülpt werden kann. Um die Schutzhaube 1 an dem Maschinenhals zu befestigen, ist der Betätigungsgriff 14 zu schließen, wodurch der Radius des Spannrings wieder verkleinert wird, und die Drehsicherungselemente 19 in die nicht dargestellten Drehsicherungsgegenelemente des nicht dargestellten Maschinenhalses sowie das Federelement 23 beziehungsweise die Nase 24 in ein nicht dargestelltes Gegenelement, beispielsweise eine nicht dargestellte Ringnut, an dem nicht dargestellten Maschinenhals eingreifen. Nur, wenn dieser Eingriff in richtiger Weise erfolgt, wenn also jedem Drehsicherungselement ein entsprechendes Drehsicherungsgegenelement gegenüber liegt und auch dem Federelement 23 beziehungsweise der Nase 24 ein entsprechendes nicht dargestelltes Gegenelement gegenüber liegt, lässt sich der Spannring 7 schließen und die Schutzhaube 1 an dem Maschinenhals befestigen. Für eine erstmalige Einstellung des für den jeweiligen Maschinenhals zutreffenden Umfangs kann eine hier nicht dargestellte Regulierschraube im Bereich des Spannstiftes 12 und vorzugsweise des Lagerbocks 11 vorgesehen sein, beispielsweise durch Ausführung des Spannstifts 12 als Gewindestift/-schraube. Hierdurch ist eine Feinjustage des Spanndurchmessers möglich. Zum Abnehmen der Schutzhaube 1 von dem Maschinenhals wird der Betätigungsgriff 14 geöffnet, wodurch die Drehsicherungselemente 19 und das Federelement 23 beziehungsweise die Nase 24 aus den entsprechenden Drehsicherungsgegenelementen beziehungsweise dem Gegenelement gelöst werden. Bei Ausbildung des Federelements 23 wird zu dem durch Federkraftbeaufschlagung des Spannrings 8 in Richtung der Rotationsachse des nicht dargestellten Rotationswerkzeugs im Maschinenhals ein Öffnen des Spannrings 7 bewirkt. Die Drehsicherungselemente sowie das Federelement 23 beziehungsweise die Nase 24 kommen so aus dem Eingriff der jeweiligen Drehsicherungsgegenelemente beziehungsweise des Gegenelementes, und die Schutzhaube 1 kann vom Maschinenhals abgenommen werden.When opening the clamping ring 7 by pressing the operating handle 14 and thereby loosening / loosening the clamping band 8, the radius of the clamping ring is extended, so that the clamping ring with the protective cover 1 can be slipped over the machine neck, not shown. To attach the protective cover 1 to the machine neck, the operating handle 14 is to close, whereby the radius of the Clamping ring is reduced again, and the anti-rotation elements 19 engage in the anti-rotation counter-elements of the machine neck, not shown, and the spring element 23 and the nose 24 in a non-illustrated counter element, such as an annular groove, not shown on the machine neck. Only if this intervention takes place in the right way, so if each anti-rotation element is opposite anti-rotation element and also the spring element 23 and the nose 24 is a corresponding unillustrated counter element opposite, the clamping ring 7 can close and attach the guard 1 to the machine neck , For an initial setting of the applicable for the respective machine neck circumference, a regulating screw, not shown here in the region of the clamping pin 12 and preferably of the bearing block 11 may be provided, for example by execution of the clamping pin 12 as a threaded pin / screw. As a result, a fine adjustment of the clamping diameter is possible. To remove the protective cover 1 from the machine neck of the operating handle 14 is opened, whereby the anti-rotation elements 19 and the spring element 23 and the nose 24 are released from the corresponding anti-rotation counter-elements or the counter-element. When forming the spring element 23, an opening of the clamping ring 7 is effected by the Federkraftbeaufschlagung of the clamping ring 8 in the direction of the axis of rotation of the rotary tool, not shown, in the machine neck. The anti-rotation elements and the spring element 23 and the nose 24 come out of engagement of the respective anti-rotation counter-elements or the counter-element, and the protective cover 1 can be removed from the machine neck.

Durch Ausbildung einer Vielzahl von Drehsicherungsgegenelementen an dem nicht dargestellten Maschinenhals ist es möglich, die Schutzhaube nach Öffnen des Spannrings 7 (nämlich durch Betätigen des Betätigungsgriffs 14) in unterschiedliche Winkelpositionen relativ zum Handwerkszeug zu bringen, wobei dies in einem solchen Bereich möglich ist, als die Drehsicherungselemente 19 den nicht dargestellten Drehsicherungsgegenelementen entsprechen. Wo solche am Maschinenhals nicht ausgebildet sind, können die Drehsicherungselemente 19 nicht eingreifen, so dass ein Schließen des Spannrings nicht möglich ist und sich die Schutzhaube nicht in einer solchen fehlerhaften Weise befestigen lässt.By forming a plurality of anti-rotation counter-elements on the machine neck, not shown, it is possible, the protective cover after opening the clamping ring 7 (namely by pressing the operating handle 14) to bring in different angular positions relative to the tools, this being possible in such an area, as the anti-rotation elements 19 correspond to the anti-rotation counter-elements not shown. Where such are not formed on the machine neck, the anti-rotation elements 19 can not engage, so that a closing of the clamping ring is not possible and the guard can not be fixed in such a faulty manner.

Werden mehrere Drehsicherungselemente 19 in jeweils unterschiedlicher Erhöhung 25 ausgebildet, dergestalt, dass die Erhöhung 25 mit jedem Drehsicherungselement 19 steigt oder aber fällt, so dass sich ein ansteigendes oder ein fallendes Höhenprofil ergibt, lässt sich sehr vorteilhaft eine gute, sichere Verstellung bei gleichzeitig nur geringer Öffnungsweite des Spannrings 7 bewirken. Dennoch lässt sich die Schutzhaube 1 nicht unabsichtlich vom nicht dargestellten Maschinenhals lösen, und gleichzeitig ist ein jederzeit sicherer Eingriff in die nicht dargestellten Drehsicherungsgegenelemente gegeben.If a plurality of anti-rotation elements 19 each formed in a different elevation 25, such that the increase 25 with each anti-rotation element 19 rises or falls, so that there is a rising or falling height profile, can be very beneficial good, safe adjustment at the same time only lower Opening the opening of the clamping ring 7 effect. Nevertheless, the protective cover 1 can not unintentionally release from the machine neck, not shown, and at the same time there is an always secure engagement in the anti-rotation counter-elements, not shown.

Claims (17)

  1. Protective hood (1) for a portable tool having a rotary tool, comprising a clamping device (6) designed as a clamping ring (7) for fastening to a machine neck of the portable tool, and comprising an anti-rotation locking means for fixing the angular position of the protective hood relative to the portable tool, characterized in that at least one rotation-locking element (19) interacting with a rotation-locking mating element of the machine neck is arranged in a fixed position on the clamping ring (7) for forming the anti-rotation locking means.
  2. Protective hood according to Claim 1, characterized in that the rotation-locking element (19) is designed as a prominence and the rotation-locking mating element is designed as a recess.
  3. Protective hood according to Claim 1, characterized in that the rotation-locking element (19) is designed as a recess and the rotation-locking mating element is designed as a prominence.
  4. Protective hood according to one or more of the preceding claims, characterized in that the clamping ring (7) is designed as an open clamping ring (9) having an opening (10).
  5. Protective hood according to one or more of the preceding claims, characterized in that at least a section of the clamping ring (7) is designed as a clamping band (8).
  6. Protective hood according to one or more of the preceding claims, characterized in that the clamping ring (7) has a lever clamping device (18).
  7. Protective hood according to one or more of the preceding claims, characterized in that the clamping ring (7) has a spring element (23) on its inner wall.
  8. Protective hood according to Claim 8, characterized in that the spring element (23) is a leaf or bow spring.
  9. Protective hood according to one or more of Claims 7 to 8, characterized in that the spring width of the spring element (23) is smaller than the ring height of the clamping ring (7).
  10. Protective hood according to one or more of Claims 7 to 9, characterized in that the spring element (23) can interact with recesses and/or at least one annular groove formed in the machine neck.
  11. Protective hood according to one or more of the preceding claims, characterized in that the rotation-locking element (19) is designed in the shape of a trapezoidal tooth.
  12. Protective hood according to one or more of the preceding claims, characterized in that the rotation-locking element (19) is designed in the shape of a one-sided trapezoidal tooth.
  13. Protective hood according to Claim 12, characterized in that the embodiment in the shape of a one-sided trapezoidal tooth has a steep section (22) which is oriented towards the opening (10).
  14. Protective hood according to one or more of the preceding claims, characterized by a plurality of rotation-locking elements (19) having different prominences (25).
  15. Protective hood according to one or more of the preceding claims, characterized in that the rotation-locking elements (19) have a rising height profile.
  16. Protective hood according to one or more of the preceding claims, characterized in that the rotation-locking element (19) is of cylindrical design.
  17. Portable tool comprising a machine neck and a protective hood according to one or more of the preceding claims, characterized in that the machine neck has at least one rotation-locking mating element which can interact with at least one rotation-locking element (19).
EP06819248A 2005-12-23 2006-11-03 Protective hood with clamping device Active EP1965949B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005061867A DE102005061867A1 (en) 2005-12-23 2005-12-23 Protective hood with clamping device for hand-held tool has turning lock element acting with turn lock counter-element on machine neck of tool
PCT/EP2006/068083 WO2007073970A1 (en) 2005-12-23 2006-11-03 Protective hood with clamping device

Publications (2)

Publication Number Publication Date
EP1965949A1 EP1965949A1 (en) 2008-09-10
EP1965949B1 true EP1965949B1 (en) 2011-01-19

Family

ID=37734942

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EP06819248A Active EP1965949B1 (en) 2005-12-23 2006-11-03 Protective hood with clamping device

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US (1) US7628682B2 (en)
EP (1) EP1965949B1 (en)
CN (1) CN101346212B (en)
DE (2) DE102005061867A1 (en)
WO (1) WO2007073970A1 (en)

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US8591293B2 (en) * 2007-11-21 2013-11-26 Hitachi Koki Co., Ltd. Power tool
DE102008002468A1 (en) * 2008-06-17 2009-12-24 Robert Bosch Gmbh Machine tool, in particular hand tool
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JP5297392B2 (en) * 2009-07-06 2013-09-25 株式会社マキタ Thunder
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US10293421B2 (en) 2016-09-15 2019-05-21 Dustless Depot, Llc Circular saw dust collection shroud
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Also Published As

Publication number Publication date
US20080207098A1 (en) 2008-08-28
DE102005061867A1 (en) 2007-07-05
CN101346212A (en) 2009-01-14
DE502006008782D1 (en) 2011-03-03
US7628682B2 (en) 2009-12-08
EP1965949A1 (en) 2008-09-10
CN101346212B (en) 2013-07-24
WO2007073970A1 (en) 2007-07-05

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