EP0732174B1 - Clamping device for fixing a tool - Google Patents

Clamping device for fixing a tool Download PDF

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Publication number
EP0732174B1
EP0732174B1 EP95120336A EP95120336A EP0732174B1 EP 0732174 B1 EP0732174 B1 EP 0732174B1 EP 95120336 A EP95120336 A EP 95120336A EP 95120336 A EP95120336 A EP 95120336A EP 0732174 B1 EP0732174 B1 EP 0732174B1
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EP
European Patent Office
Prior art keywords
clamping device
nut member
disc
spring
clamping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95120336A
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German (de)
French (fr)
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EP0732174A3 (en
EP0732174A2 (en
Inventor
Erich Preis
Siegfried STÄMMELE
Alfred Schmidt
Herbert Piater
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Techtronic Industries GmbH
Original Assignee
Atlas Copco Electric Tools GmbH
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Publication date
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Publication of EP0732174A2 publication Critical patent/EP0732174A2/en
Publication of EP0732174A3 publication Critical patent/EP0732174A3/en
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Publication of EP0732174B1 publication Critical patent/EP0732174B1/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
    • 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
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/16—Bushings; Mountings

Definitions

  • the invention relates to a clamping device for Setting a disc-shaped tool, in particular Grinding wheel, on a threaded spindle Hand machine tool, one on the threaded spindle screw-on nut part a clamping disc against that Tool presses and between your mother part and the An axial roller bearing is arranged.
  • tensioning device for example a grinding wheel attached to an angle grinder will.
  • the tensioning device is an independent part, so that angle grinders with usual threaded spindles can also be retrofitted with the clamping device.
  • Such a tensioning device is in the DE-OS 21 56 770 described.
  • Through the axial roller bearing should be the friction between the tool or on it adjacent washer and your nut part in be essentially canceled. This pulls the Mother not firm in the company. So the mother has to go Sufficient start of operation with a wrench be tightened, the torque of the Transfer threaded spindle to the grinding wheel. In practice, this requires a wrench. At this construction will use the entire torque a flange of the threaded spindle on the grinding wheel transfer. The tension disc itself does not transmit anything Torque on the grinding wheel.
  • DE 37 05 638 C1 is a tensioning device described in which for torque transmission Spring washer wedged to the nut part by clamping parts becomes. To relax the tensioning device Clamping parts by actuating a rotary ring radially Approved. This tensions under extreme loads Mother part accordingly firm. A Slip clutch function has the tensioning device of the DE 37 05 638 C1 does not. The overall height of this Tensioning device is comparatively large, which is what Work disturbs. Since the rotating ring is close to the Grinding wheel is in use in practice little convenient.
  • DE 42 43 328 C1 is a quick release device described with a disc spring.
  • the disc spring should prevent the quick release device when Decelerate the grinding wheel by itself from the Threaded spindle releases. When working with the grinding wheel the disc spring is ineffective; it does not lead to one Overload slip clutch effect.
  • the object of the invention is a tensioning device propose the type mentioned above, which is a simple and safe manual clamping and loosening connected with a slip clutch function in the event of overload.
  • the above task is for a Clamping device of the type mentioned in the introduction solved that between the spring washer and the nut part the axial roller bearing on his Outer circumference Spring is arranged wherein the spring for transmitting the torque from the Threaded spindle on the tool a frictional connection forms between the nut part and the spring washer and the thrust roller bearing axially the washer on the nut part supports, and that when exceeding an upper Limit value of the torque (overload) the mother part slips against the tension disc, the Axial roller bearing rotates.
  • the mother part is used to release the clamping device operated. It is a tension and loosening of the Clamping device possible by hand without auxiliary tools.
  • Embodiment of the invention on the mother part pivotable flap be stored. With this it is Screwing of the nut part is easy.
  • tensioning device Another advantage of the tensioning device is that that all angle grinders have the usual standard threaded spindle are easy to retrofit. It is also favorable that the tensioning device is flat can be made.
  • the tensioning device has a nut part that a nut (1) and a positive on this non-rotatably arranged bell (2).
  • the mother (1) is with an internal thread (3) on a not shown Threaded spindle of a hand machine tool, for example Angle grinder, screwable.
  • the lead screw is provided with a flange against which one is not closer shown grinding wheel is pressed.
  • a tensioning disc (4) can be rotated and with low stroke axially displaceable.
  • An outer edge (6) of the bell (2) is in front of the Outer circumference of the tension disc (4).
  • An annular surface (7) is on the tensioning disc (4) trained, which serves to abut the grinding wheel.
  • the grinding wheel is thus between the above Flange of the threaded spindle and the ring surface (7).
  • a hardened washer (8) lies in the bell (2). Between the bell (2) or the washer (8) and the tension disk (4) is an axial needle bearing (9) arranged, the washer (8) as a tread serves. Between the washer (8) and the Spring washer (4) is an annular disc spring (10) provided that with its inner edge (11) on the Intermediate disc (8) and with its outer edge (12) on the Bracing washer (4) supported. Encloses the disc spring (10) the needle bearing (9) on its outer circumference. So there are two mechanically parallel transmission means between the Mother part (1) and the clamping washer (4), namely on the one hand the axial needle bearing (9) and on the other hand the plate spring (10). Instead of the plate spring (10) could also other such springs, for example corrugated springs, be provided. A spring (10) could also be a rubber elastic ring can be used. The disc spring (10) or the ring seals the space in which the Axial needle bearing (9) is located on the outside.
  • a flap (13) is pivotably mounted on the mother part (1, 2) by means of locking lugs (14).
  • the flap (13) extends approximately 180 o and is provided with depressions (15).
  • the stopper tabs (14) are loaded by a further spring plate (16) and designed so that the flap (13) is locked in a flat on the bell (2) resting position and in a by about 80 o raised position.
  • the further plate spring (16) is dimensioned such that the flap (13) automatically moves from the folded-up position into the position in which it is on the bell (2 ) rests.
  • Auxiliary holes (17) can be provided on the bell (2), with which the mother part (1,2) in particular Malfunctions by inserting a standard two-hole nut driver is solvable.
  • the disc spring (10) caused rotationally fixed frictional connection between the nut part (1,2) and the spring washer (4) and thus also a rotationally fixed friction connection between the Spring washer (4) and the grinding wheel.
  • the upper Limit of the transferable torque is by the Clamping force of the disc spring (10) and another Axial needle bearing (9) preventing the disk spring (10) from tightening limited. It is dimensioned for normal operation of the grinding wheel is sufficient.
  • the tensioning device easily without tools possible because the torque limit described excessive tightening of the tensioning disc (4) prevented from the nut part (1,2) and the axial needle bearing (9) is provided.
  • the Belleville washer (10) ensure that the tensioning washer (4) loosens against the nut part (1,2) before the The clamping disc (4) detaches from the grinding disc. This is cheap, because otherwise the tensioning device in the braced Condition would be unscrewed from the threaded spindle.
  • the described mode of action takes place in a flat Characteristic range of the plate spring (10) instead.
  • the Spring distance is only a fraction of a um, for example 2/10 ⁇ m.
  • the The clamping device has a diaphragm spring (10) Preload.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Die Erfindung betrifft eine Spanneinrichtung zum Festlegen eines scheibenförmigen Werkzeugs, insbesondere Schleifscheibe, an einer Gewindespindel einer Handwerkzeugmaschine, wobei ein auf die Gewindespindel aufschraubbares Mutterteil eine Spannscheibe gegen das Werkzeug drückt und zwischen dein Mutterteil und der Spannscheibe ein Axial-Wälzlager angeordnet ist.The invention relates to a clamping device for Setting a disc-shaped tool, in particular Grinding wheel, on a threaded spindle Hand machine tool, one on the threaded spindle screw-on nut part a clamping disc against that Tool presses and between your mother part and the An axial roller bearing is arranged.

Mit einer solchen Spanneinrichtung soll beispielsweise eine Schleifscheibe an einem Winkelschleifer befestigt werden. Die Spanneinrichtung ist ein selbständiges Teil, so daß sich Winkelschleifer mit üblichen Gewindespindeln auch mit der Spanneinrichtung nachrüsten lassen.With such a tensioning device, for example a grinding wheel attached to an angle grinder will. The tensioning device is an independent part, so that angle grinders with usual threaded spindles can also be retrofitted with the clamping device.

Eine derartige Spanneinrichtung ist in der DE-OS 21 56 770 beschrieben. Durch das Axial-Wälzlager soll die Reibung zwischen dem Werkzeug bzw. der an ihm anliegenden Spannscheibe und dein Mutterteil im wesentlichen aufgehoben werden. Dadurch zieht sich die Mutter im Betrieb nicht fester. Die Mutter muß also vor Betriebsbeginn mittels eines Spannschlüssels hinreichend festgezogen werden, uni das Drehmoment von der Gewindespindel auf die Schleifscheibe zu übertragen. Hierfür ist in der Praxis ein Spannschlüssel nötig. Bei dieser Konstruktion wird das gesamte Drehmoment über einen Flansch der Gewindespindel auf die Schleifscheibe übertragen. Die Spannscheibe selbst überträgt kein Drehmoment auf die Schleifscheibe.Such a tensioning device is in the DE-OS 21 56 770 described. Through the axial roller bearing should be the friction between the tool or on it adjacent washer and your nut part in be essentially canceled. This pulls the Mother not firm in the company. So the mother has to go Sufficient start of operation with a wrench be tightened, the torque of the Transfer threaded spindle to the grinding wheel. In practice, this requires a wrench. At this construction will use the entire torque a flange of the threaded spindle on the grinding wheel transfer. The tension disc itself does not transmit anything Torque on the grinding wheel.

In der DE 37 05 638 C1 ist eine Spanneinrichtung beschrieben, bei der zur Drehmomentübertragung die Spannscheibe mit den Mutterteil durch Klemmteile verkeilt wird. Zum Entspannen der Spanneinrichtung werden die Klemmteile durch Betätigen eines Drehringes radial freigegeben. Bei extremer Belastung spannt sich das Mutterteil entsprechend fest. Eine Rutschkupplungsfunktion hat die Spanneinrichtung der DE 37 05 638 C1 nicht. Die Bauhöhe dieser Spanneinrichtung ist vergleichsweise groß, was beim Arbeiten stört. Da der Drehring nahe bei der Schleifscheibe steht, ist die Betätigung in der Praxis wenig bequem.DE 37 05 638 C1 is a tensioning device described in which for torque transmission Spring washer wedged to the nut part by clamping parts becomes. To relax the tensioning device Clamping parts by actuating a rotary ring radially Approved. This tensions under extreme loads Mother part accordingly firm. A Slip clutch function has the tensioning device of the DE 37 05 638 C1 does not. The overall height of this Tensioning device is comparatively large, which is what Work disturbs. Since the rotating ring is close to the Grinding wheel is in use in practice little convenient.

In der DE 40 31 725 A1 ist eine ähnliche Schnellspanneinrichtung beschrieben. Kugelförmige Wälzkörper zwischen dein Mutterteil, der Spannscheibe und dein Drehring laufen auf besonders gestalteten Laufbahnen. Auch hier besteht keine Rutschkupplungsfunktion.DE 40 31 725 A1 is a similar one Quick release device described. Spherical Rolling elements between your nut part, the tension disc and Your rotating ring runs on specially designed careers. There is no slip clutch function here either.

Bei der Spanneinrichtung nach der WO 92/04 549 A1 ist zwischen dem Mutterteil und der Spannscheibe ein Gleitstoffring angeordnet. Bei extremer Belastung wird die Mutter so stark angezogen, daß sie nur schwer von Hand gelöst werden kann. Zur Betätigung der Mutter ist an ihr eine schwenkbare Klappe vorgesehen.In the tensioning device according to WO 92/04 549 A1 between the nut part and the spring washer Lubricant ring arranged. With extreme load the mother attracted so much that she was hardly Hand can be released. To operate the mother is on you provided a hinged flap.

In der DE 42 43 328 C1 ist eine Schnellspanneinrichtung mit einer Tellerfeder beschrieben. Die Tellerfeder soll verhindern, daß sich die Schnellspanneinrichtung beim Abbremsen der Schleifscheibe von selbst von der Gewindespindel löst. Beim Arbeiten mit der Schleifscheibe ist die Tellerfeder wirkungslos; sie führt nicht zu einem Überlast-Rutschkupplungseffekt.DE 42 43 328 C1 is a quick release device described with a disc spring. The disc spring should prevent the quick release device when Decelerate the grinding wheel by itself from the Threaded spindle releases. When working with the grinding wheel the disc spring is ineffective; it does not lead to one Overload slip clutch effect.

Aufgabe der Erfindung ist es, eine Spanneinrichtung der eingangs genannten Art vorzuschlagen, die ein einfaches und sicheres manuelles Spannen und Lösen, verbunden mit einer Rutschkupplungsfunktion bei Überlast, gestattet.The object of the invention is a tensioning device propose the type mentioned above, which is a simple and safe manual clamping and loosening connected with a slip clutch function in the event of overload.

Erfindungsgemäß ist obige Aufgabe bei einer Spanneinrichtung der eingangs genannten Art dadurch gelöst, daß zwischen der Spannscheibe und dem Mutterteil eine das Axial-Wälzlager an seinem Außenumfang umschließende Feder angeordnet ist, wobei die Feder zur Übertragung des Drehmoments von der Gewindespindel auf das Werkzeug eine Reibschlußverbindung zwischen dem Mutterteil und der Spannscheibe bildet und das Axial-Wälzlager die Spannscheibe am Mutterteil axial abstützt, und daß bei Überschreiten eines oberen Grenzwertes des Drehmoments (Überlast) das Mutterteil gegenüber der Spannscheibe durchrutscht, wobei das Axial-Wälzlager rotiert.According to the invention, the above task is for a Clamping device of the type mentioned in the introduction solved that between the spring washer and the nut part the axial roller bearing on his Outer circumference Spring is arranged wherein the spring for transmitting the torque from the Threaded spindle on the tool a frictional connection forms between the nut part and the spring washer and the thrust roller bearing axially the washer on the nut part supports, and that when exceeding an upper Limit value of the torque (overload) the mother part slips against the tension disc, the Axial roller bearing rotates.

Beim Anziehen des Mutterteils an der Gewindespindel drückt die Feder auf die Spannscheibe, so daß diese gegen das Werkzeug gepreßt wird. Es besteht damit eine reibschlüssige Verbindung zur Übertragung des Drehmoments von dein Mutterteil auf die Spannscheibe bzw. das Werkzeug. Beim Betriebsbeginn zieht sich die Verbindung bis zum Erreichen eines durch die Vorspannung der Tellerfeder vorbestimmten Drehmomentwerts fest. Das Axial-Wälzlager stützt die Spannscheibe am Mutterteil axial ab.When tightening the nut part on the threaded spindle presses the spring on the spring washer, so that this against the tool is pressed. So there is one frictional connection for transmission of the torque from your mother part to the spring washer or that Tool. At the start of operation, the connection is pulled until one is reached by the preload Belleville spring predetermined torque value. The Axial roller bearings support the tension plate on the nut part axially.

Bei Überlast, also beim Überschreiten des Grenzwertes des Drehmoments, beispielsweise beim Verkanten der Schleifscheibe, rutscht die Spannscheibe gegenüber dem Mutterteil. Dadurch ist eine Rutschkupplungsfunktion erreicht, durch die ein Getriebe der Werkzeugmaschine gegen Überlast geschützt ist. In the event of an overload, i.e. when the limit value of the Torque, for example when tilting the Grinding wheel, the tensioning wheel slips opposite the Mother part. This is a slip clutch function achieved through which a gear of the machine tool is protected against overload.

Zum Lösen der Spanneinrichtung wird das Mutterteil betätigt. Es ist ein Spannen und Lösen der Spanneinrichtung ohne Hilfswerkzeug von Hand möglich. Zur Erleichterung der Bedienbarkeit kann in bevorzugter Ausgestaltung der Erfindung am Mutterteil eine schwenkbare Klappe gelagert sein. Mit dieser ist das Schrauben des Mutterteils bequem möglich.The mother part is used to release the clamping device operated. It is a tension and loosening of the Clamping device possible by hand without auxiliary tools. For Ease of use may be preferred Embodiment of the invention on the mother part pivotable flap be stored. With this it is Screwing of the nut part is easy.

Ein weiterer Vorteil der Spanneinrichtung besteht darin, daß alle Winkelschleifer mit üblicher Standard-Gewindespindel leicht nachrüstbar sind. Günstig ist auch, daß die Spanneinrichtung sich in flacher Bauweise herstellen läßt.Another advantage of the tensioning device is that that all angle grinders have the usual standard threaded spindle are easy to retrofit. It is also favorable that the tensioning device is flat can be made.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus der folgenden Beschreibung eines Ausführungsbeispiels. In der Zeichnung zeigen:

  • Figur 1 eine Aufsicht einer Spanneinrichtung für eine Spannscheibe eines Winkelschleifers,
  • Figur 2 einen Schnitt längs der Linie II-II nach Fig. 1,
  • Figur 3 eine Klappe zur Betätigung des Mutterteils in Aufsicht und
  • Figur 4 eine Seiten-Schnittansicht der Klappe.
    • Further advantageous refinements of the invention result from the following description of an exemplary embodiment. The drawing shows:
  • FIG. 1 shows a top view of a clamping device for a clamping disk of an angle grinder,
  • 2 shows a section along the line II-II of FIG. 1,
  • Figure 3 is a flap for actuating the nut part in supervision and
  • Figure 4 is a side sectional view of the flap.

    • Die Spanneinrichtung weist ein Mutterteil auf, das aus einer Mutter(1) und einer an dieser formschlüssig drehfest angeordneten Glocke(2) besteht. Die Mutter(1) ist mit einem Innengewinde(3) auf eine nicht dargestellte Gewindespindel einer Handwerkzeugmaschine, beispielsweise Winkelschleifer, aufschraubbar. Die Gewindespindel ist mit einem Flansch versehen, gegen den eine nicht näher dargestellte Schleifscheibe andrückbar ist. The tensioning device has a nut part that a nut (1) and a positive on this non-rotatably arranged bell (2). The mother (1) is with an internal thread (3) on a not shown Threaded spindle of a hand machine tool, for example Angle grinder, screwable. The lead screw is provided with a flange against which one is not closer shown grinding wheel is pressed.

    An der Mutter(1) ist eine Spannscheibe(4) drehbar und mit geringem Hub axial verschieblich gelagert. Ein Ringrand (5) der Mutter(1) hält die Spannscheibe(4) an der Mutter (1). Ein Außenrand(6) der Glocke(2) steht vor dem Außenumfang der Spannscheibe(4).On the nut (1) a tensioning disc (4) can be rotated and with low stroke axially displaceable. A ring edge (5) the nut (1) holds the spring washer (4) on the nut (1). An outer edge (6) of the bell (2) is in front of the Outer circumference of the tension disc (4).

    An der Spannscheibe(4) ist eine Ringfläche(7) ausgebildet, die zur Anlage an der Schleifscheibe dient. Die Schleifscheibe steht also zwischen dem genannten Flansch der Gewindespindel und der Ringfläche(7).An annular surface (7) is on the tensioning disc (4) trained, which serves to abut the grinding wheel. The grinding wheel is thus between the above Flange of the threaded spindle and the ring surface (7).

    In der Glocke(2) liegt eine gehärtete Zwischenscheibe(8). Zwischen der Glocke(2) bzw. der Zwischenscheibe(8) und der Spannscheibe(4) ist ein Axial-Nadellager(9) angeordnet, dem die Zwischenscheibe(8) als Lauffläche dient. Zwischen der Zwischenscheibe(8) und der Spannscheibe(4) ist eine ringförmige Tellerfeder(10) vorgesehen, die sich mit ihrem Innenrand(11) an der Zwischenscheibe(8) und mit ihrem Außenrand(12) an der Spannscheibe(4) abstützt. Die Tellerfeder(10) umschließt das Nadellager(9) an seinem Außenumfang. Es bestehen also zwei mechanisch parallele Übertragungsmittel zwischen dem Mutterteil(1) und der Spannscheibe(4), nämlich einerseits das Axial-Nadellager(9) und andererseits die Tellerfeder (10). Anstelle der Tellerfeder(10) könnte auch eine andere derartige Feder, beispielsweise Wellfeder, vorgesehen sein. Als Feder(10) könnte auch ein gummielastischer Ring verwendet werden. Die Tellerfeder (10) bzw. der Ring dichtet den Raum, in dem sich das Axial-Nadellager(9) befindet, nach außen ab.A hardened washer (8) lies in the bell (2). Between the bell (2) or the washer (8) and the tension disk (4) is an axial needle bearing (9) arranged, the washer (8) as a tread serves. Between the washer (8) and the Spring washer (4) is an annular disc spring (10) provided that with its inner edge (11) on the Intermediate disc (8) and with its outer edge (12) on the Bracing washer (4) supported. Encloses the disc spring (10) the needle bearing (9) on its outer circumference. So there are two mechanically parallel transmission means between the Mother part (1) and the clamping washer (4), namely on the one hand the axial needle bearing (9) and on the other hand the plate spring (10). Instead of the plate spring (10) could also other such springs, for example corrugated springs, be provided. A spring (10) could also be a rubber elastic ring can be used. The disc spring (10) or the ring seals the space in which the Axial needle bearing (9) is located on the outside.

    Am Mutterteil(1,2) ist eine Klappe(13) mittels Arretiernasen(14) schwenkbar gelagert. Die Klappe(13) erstreckt sich etwa über 180o und ist mit Vertiefungen(15) versehen. Die Arretiernasen(14) sind durch eine weitere Tellerfeder(16) belastet und so gestaltet, daß die Klappe(13) in einer flach auf der Glocke(2) aufliegenden Stellung und in einer um etwa 80o hochgeschwenkten Stellung arretiert ist. Die weitere Tellerfeder(16) ist so bemessen, daß sich die Klappe(13) bei rotierender Gewindespindel, d.h. rotierenden Mutterteil(1,2) von selbst unter Fliehkraftwirkung aus der hochgeklappten Stellung in die Stellung begibt, in der sie auf der Glocke(2) aufliegt.A flap (13) is pivotably mounted on the mother part (1, 2) by means of locking lugs (14). The flap (13) extends approximately 180 o and is provided with depressions (15). The stopper tabs (14) are loaded by a further spring plate (16) and designed so that the flap (13) is locked in a flat on the bell (2) resting position and in a by about 80 o raised position. The further plate spring (16) is dimensioned such that the flap (13) automatically moves from the folded-up position into the position in which it is on the bell (2 ) rests.

    An der Glocke(2) können Hilfslöcher(17) vorgesehen sein, mit denen das Mutterteil(1,2) in besonderen Störungsfällen durch Einsetzen eines Standard-Zweilochmutterndrehers lösbar ist.Auxiliary holes (17) can be provided on the bell (2), with which the mother part (1,2) in particular Malfunctions by inserting a standard two-hole nut driver is solvable.

    Die Funktionsweise der beschriebenen Spanneinrichtung ist im wesentlichen folgende:The functioning of the clamping device described is essentially the following:

    Nach dem Aufsetzen der Schleifscheibe auf den Flansch der Gewindespindel wird die Spanneinrichtung auf die Gewindespindel aufgesetzt und das Mutterteil(1,2) wird bei hochgeklappter Klappe(13) mittels dieser aufgeschraubt. Dabei legt sich die Ringfläche(7) der Spannscheibe(4) an die Schleifscheibe an und wird unter Spannung der Tellerfeder(10) gegen die Schleifscheibe gespannt.After placing the grinding wheel on the flange of the Threaded spindle is the clamping device on the Threaded spindle placed and the nut part (1,2) with the flap (13) folded up by means of this screwed on. The ring surface (7) lies down Clamping disc (4) on the grinding wheel and is under Tension the disc spring (10) against the grinding wheel curious; excited.

    Dabei oder spätestens beim Arbeiten mit der Werkzeugmaschine entsteht eine durch die Tellerfeder(10) hervorgerufene drehfeste Reibschlußverbindung zwischen dem Mutterteil(1,2) und der Spannscheibe(4) und damit auch eine drehfeste Reibschlußverbindung zwischen der Spannscheibe(4) und der Schleifscheibe. Der obere Grenzwert des übertragbaren Drehmoments ist durch die Spannkraft der Tellerfeder(10) und durch das ein weiteres Festspannen der Tellerfeder(10) verhinderndes Axial-Nadellagers(9) begrenzt. Es ist so bemessen, daß es für den normalen Betrieb der Schleifscheibe ausreicht.At the same time or at the latest when working with the Machine tool is created by the disc spring (10) caused rotationally fixed frictional connection between the nut part (1,2) and the spring washer (4) and thus also a rotationally fixed friction connection between the Spring washer (4) and the grinding wheel. The upper Limit of the transferable torque is by the Clamping force of the disc spring (10) and another Axial needle bearing (9) preventing the disk spring (10) from tightening limited. It is dimensioned for normal operation of the grinding wheel is sufficient.

    Im Normalbetrieb findet im Nadellager(9) keine Relativbewegung statt. Es stützt die Spannscheibe(4) über die Zwischenscheibe(8) an der Glocke(2) des Mutterteils (1,2) ab.In normal operation there is none in the needle bearing (9) Relative movement instead. It supports the spring washer (4) the washer (8) on the bell (2) of the nut part (1,2).

    Bei Überlast an der Schleifscheibe, also beim Überschreiten des oberen Grenzwertes des Drehmoments, ergibt sich eine Relativdrehung zwischen der Spannscheibe (4) und der Glocke(2). Die Tellerfeder(10) rutscht also mit ihrem Innenrand(11) an der Zwischenscheibe(8) bzw. der Glocke(2) durch. Das Axial-Nadellager(9) rotiert nun. Es stützt weiterhin die Spannscheibe(4) an dem Mutterteil (1,2) ab. Durch diese Begrenzung des übertragbaren Drehmoments, d.h. Rutschkupplungsfunktion, ist gewährleistet, daß das Getriebe der Werkzeugmaschine gegen Überlast und auch gegen dauernde und stoßartige Überlast geschützt ist und daß sich das Mutterteil(1,2) nicht so fest mit der Spannscheibe(4) verspannt, daß später ein manuelles Lösen kaum mehr möglich ist.If there is an overload on the grinding wheel, that is Exceeding the upper limit of the torque, there is a relative rotation between the spring washer (4) and the bell (2). The plate spring (10) slips with its inner edge (11) on the intermediate disc (8) or the bell (2) through. The axial needle bearing (9) now rotates. It also supports the clamping washer (4) on the nut part (1,2). By limiting the transferable Torque, i.e. Slip clutch function is ensures that the gear of the machine tool against overload and also against permanent and shock-like Overload is protected and that the nut part (1,2) not so tightly clamped with the spring washer (4) that manual release is hardly possible later.

    Es könnte jedoch auch zwischen der Zwischenscheibe(8) und dem Innenrand(11) der Tellerfeder(10) gezielt ein Reib- oder Formschluß gestaltet sein, so daß die Tellerfeder (10) bei Überlast mit ihrem Außenrand(12) an deren Spannscheibe(4) durchrutscht. Dies hat den Vorteil, daß ein größerer Teil der Axialkräfte über das Axiallager(9) übertragen wird. Dadurch wird das zum Lösen der Spanneinrichtung nötige Drehmoment erniedrigt.However, it could also between the washer (8) and the inner edge (11) of the plate spring (10) specifically a friction or Form fit to be designed so that the plate spring (10) with overload with their outer edge (12) on their Spring washer (4) slips. This has the advantage that a larger part of the axial forces via the thrust bearing (9) is transmitted. This will solve the problem Tightening device required torque reduced.

    Zum Lösen der Spanneinrichtung wird die Klappe(13) hochgeklappt und es wird mit ihr das Mutterteil(1,2) gelockert, wobei sich die Tellerfeder(10) entspannt und sich dadurch die Ringfläche(7) der Spannscheibe(4) von der Schleifscheibe löst. Im Normalfall ist das Abschrauben der Spanneinrichtung ohne Hilfsmittel leicht möglich, weil die beschriebene Drehmomentbegrenzung ein übertrieben festes Verspannen der Spannscheibe(4) gegenüber dem Mutterteil(1,2) verhindert und das Axial-Nadellager(9) vorgesehen ist. Außerdem stellt die Tellerfeder(10) sicher, daß sich die Spannscheibe(4) gegenüber dem Mutterteil(1,2) lockert, bevor sich die Spannscheibe(4) von der Schleifscheibe löst. Dies ist günstig, weil sonst die Spanneinrichtung im verspannten Zustand von der Gewindespindel abgeschraubt würde.To release the tensioning device, the flap (13) folded up and it becomes the mother part (1,2) loosened, the disc spring (10) relaxing and thereby the annular surface (7) of the spring washer (4) the grinding wheel loosens. Usually it is Unscrew the tensioning device easily without tools possible because the torque limit described excessive tightening of the tensioning disc (4) prevented from the nut part (1,2) and the axial needle bearing (9) is provided. In addition, the Belleville washer (10) ensure that the tensioning washer (4) loosens against the nut part (1,2) before the The clamping disc (4) detaches from the grinding disc. This is cheap, because otherwise the tensioning device in the braced Condition would be unscrewed from the threaded spindle.

    Die beschriebene Wirkungsweise findet in einem flachen Kennlinienbereich der Tellerfeder(10) statt. Die Federstrecke beträgt dabei nur Bruchteile eines um, beispielsweise 2/10 um. Im zusammengebauten Zustand der Spanneinrichtung hat die Tellerfeder(10) eine Vorspannung.The described mode of action takes place in a flat Characteristic range of the plate spring (10) instead. The Spring distance is only a fraction of a um, for example 2/10 µm. When assembled, the The clamping device has a diaphragm spring (10) Preload.

    Claims (11)

    1. Clamping device for fixing a disc-shaped tool, in particular a grinding disc, on a threaded spindle of a hand-held machine tool, wherein a nut member capable of being screwed on to the threaded spindle presses a clamping disc against the tool and an axial roller bearing is disposed between the nut member and the clamping disc, characterised in that between the clamping disc (4) and the nut member (1, 2) is disposed a spring (10) which encloses the axial roller bearing on its outer circumference and which, in order to transmit the torque from the threaded spindle to the tool, forms a friction locking connection between the nut member (1, 2) and the clamping disc (4) and the axial roller bearing (9) axially supports the clamping disc (4) on the nut member (1, 2), and in that if an upper torque limit value is exceeded (overload) the nut member (1, 2) slips relative to the clamping disc (4) and the axial roller bearing (9) rotates.
    2. Clamping device according to claim 1, characterised in that the spring is a cup spring (10).
    3. Clamping device according to claim 1 or 2, characterised in that the spring (10) is under stress and the implementation and release of the friction locking connection is effected in a flat characteristic line region.
    4. Clamping device according to one of the preceding claims, characterised in that the axial roller bearing is a needle bearing (9).
    5. Clamping device according to one of the preceding claims, characterised in that the cup spring (10) encloses the axial roller bearing (9) in the radial plane.
    6. Clamping device according to one of the preceding claims characterised in that the cup spring (10) bears on an intermediate disc (8) which is in communication with the nut member (1, 2).
    7. Clamping device according to one of the preceding claims, characterised in that the nut member is formed by a nut (1) and a bell (2) non-rotatably disposed thereon.
    8. Clamping device according to claim 7, characterised in that the bell (2) encloses the clamping disc (4) on the outside.
    9. Clamping device according to one of the preceding claims, characterised in that on the nut member (1, 2) a pivotable flap (13) for actuating the nut member (1, 2) is mounted.
    10. Clamping device according to claim 9, characterised in that the flap (13) is loaded by means of a spring (16) in the locked position.
    11. Clamping device according to claim 9 or 10, characterised in that the flap (13) is so formed and disposed that under centrifugal force of the rotating nut member (1, 2) it moves out of the open position to lie against the nut member (1, 2).
    EP95120336A 1995-03-14 1995-12-21 Clamping device for fixing a tool Expired - Lifetime EP0732174B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19509147 1995-03-14
    DE19509147A DE19509147C1 (en) 1995-03-14 1995-03-14 Clamp attaching disc=shaped implement, esp. grinding wheel, to threaded spindle of hand tool machine

    Publications (3)

    Publication Number Publication Date
    EP0732174A2 EP0732174A2 (en) 1996-09-18
    EP0732174A3 EP0732174A3 (en) 1997-07-23
    EP0732174B1 true EP0732174B1 (en) 1998-07-08

    Family

    ID=7756613

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95120336A Expired - Lifetime EP0732174B1 (en) 1995-03-14 1995-12-21 Clamping device for fixing a tool

    Country Status (3)

    Country Link
    US (1) US5707275A (en)
    EP (1) EP0732174B1 (en)
    DE (2) DE19509147C1 (en)

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    USD424076S (en) * 1999-02-24 2000-05-02 Black & Decker Inc. Mounting device for a cutting tool
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    US8087976B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Trigger assembly for angle grinder
    US8087977B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder

    Also Published As

    Publication number Publication date
    EP0732174A3 (en) 1997-07-23
    DE59502759D1 (en) 1998-08-13
    US5707275A (en) 1998-01-13
    EP0732174A2 (en) 1996-09-18
    DE19509147C1 (en) 1996-05-23

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