EP0732174A2 - Clamping device for fixing a tool - Google Patents
Clamping device for fixing a tool Download PDFInfo
- Publication number
- EP0732174A2 EP0732174A2 EP95120336A EP95120336A EP0732174A2 EP 0732174 A2 EP0732174 A2 EP 0732174A2 EP 95120336 A EP95120336 A EP 95120336A EP 95120336 A EP95120336 A EP 95120336A EP 0732174 A2 EP0732174 A2 EP 0732174A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- nut part
- clamping device
- spring
- roller bearing
- 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.)
- Granted
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Classifications
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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
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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
- 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
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- 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 fixing a disk-shaped tool, in particular grinding wheel, to a threaded spindle of a hand-held power tool, a nut part that can be screwed onto the threaded spindle presses a clamping disk against the tool and an axial roller bearing is arranged between your nut part and the clamping disk.
- a grinding wheel is to be attached to an angle grinder.
- the clamping device is an independent part, so that angle grinders can also be retrofitted with conventional threaded spindles with the clamping device.
- Such a tensioning device is described in DE-OS 21 56 770.
- the axial roller bearing is intended to substantially eliminate the friction between the tool or the tensioning washer lying against it and your nut part. As a result, the mother does not pull tighter in the company.
- the nut must therefore be tightened sufficiently before starting operation by means of a wrench to transmit the torque from the threaded spindle to the grinding wheel. In practice, this requires a wrench. At In this design, the entire torque is transmitted to the grinding wheel via a flange of the threaded spindle.
- the tensioning wheel itself does not transmit any torque to the grinding wheel.
- DE 37 05 638 C1 describes a tensioning device in which the tensioning disk is wedged with the nut part by clamping parts for torque transmission. To relax the clamping device, the clamping parts are released radially by actuating a rotating ring. The nut part tightens accordingly under extreme loads.
- the tensioning device of DE 37 05 638 C1 does not have a slip clutch function. The overall height of this clamping device is comparatively large, which bothers when working. Since the rotating ring is close to the grinding wheel, actuation is not very convenient in practice.
- a lubricant ring is arranged between the nut part and the tensioning disk. Under extreme loads, the nut is tightened so much that it can only be loosened by hand.
- a pivotable flap is provided on the nut for actuating it.
- DE 42 43 328 C1 describes a quick release device with a plate spring.
- the disc spring is intended to prevent the quick release device from detaching itself from the threaded spindle when the grinding wheel is braked.
- the disc spring has no effect when working with the grinding wheel; it does not lead to one Overload slip clutch effect.
- the object of the invention is to propose a tensioning device of the type mentioned at the outset, which allows simple and safe manual tensioning and loosening, combined with a slip clutch function in the event of an overload.
- the above object is achieved in a tensioning device of the type mentioned in that a spring is arranged next to the axial roller bearing between the tensioning disk and the nut part, the spring for transmitting the torque from the threaded spindle to the tool a frictional connection between the nut part and forms the tensioning washer and the axial roller bearing axially supports the tensioning washer on the nut part, and that when an upper limit value of the torque (overload) is exceeded, the nut part slips relative to the tensioning disk, the axial roller bearing rotating.
- the spring presses on the clamping washer so that it is pressed against the tool. There is thus a frictional connection for the transmission of the torque from your nut part to the clamping washer or the tool.
- the connection is tightened until a torque value predetermined by the preload of the plate spring is reached.
- the axial roller bearing axially supports the tension plate on the nut part.
- the nut part is actuated to release the clamping device.
- the tensioning device can be tensioned and released by hand without auxiliary tools.
- a pivotable flap can be mounted on the mother part to facilitate operability. With this the screwing of the nut part is easily possible.
- clamping device Another advantage of the clamping device is that all angle grinders can be easily retrofitted with a standard threaded spindle. It is also favorable that the clamping device can be manufactured in a flat design.
- the tensioning device has a nut part which consists of a nut (1) and a bell (2) which is arranged in a rotationally fixed manner thereon.
- the nut (1) can be screwed with an internal thread (3) onto a threaded spindle, not shown, of a hand machine tool, for example an angle grinder.
- the threaded spindle is provided with a flange against which a grinding wheel, not shown, can be pressed.
- a tensioning disc (4) is rotatable on the nut (1) and axially displaceable with a small stroke.
- a ring edge (5) of the nut (1) holds the tensioning washer (4) on the nut (1).
- An outer edge (6) of the bell (2) stands in front of the outer circumference of the tensioning disc (4).
- An annular surface (7) is formed on the tensioning disc (4) and is used for contact with the grinding disc.
- the grinding wheel is thus between the flange of the threaded spindle and the annular surface (7).
- a hardened washer (8) lies in the bell (2).
- An axial needle bearing (9) is arranged between the bell (2) or the intermediate disk (8) and the tensioning disk (4), and the intermediate disk (8) serves as a running surface.
- An annular disc spring (10) is provided between the intermediate disc (8) and the clamping disc (4), which is supported with its inner edge (11) on the intermediate disc (8) and with its outer edge (12) on the clamping disc (4).
- the plate spring (10) surrounds the needle bearing (9) on its outer circumference.
- the plate spring (10) instead of the plate spring (10), another spring of this type, for example a corrugated spring, could also be provided.
- a rubber-elastic ring could also be used as the spring (10).
- the plate spring (10) or the ring seals the space in which the axial needle bearing (9) is located from 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 locking lugs (14) are loaded by a further plate spring (16) and designed so that the flap (13) in a flat position on the bell (2) and in about 80 o swung up position is locked.
- the further disc 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), by means of which the nut part (1, 2) can be released in special malfunctions by inserting a standard two-hole nut driver.
- the functioning of the clamping device described is essentially as follows: After the grinding wheel has been placed on the flange of the threaded spindle, the clamping device is placed on the threaded spindle and the nut part (1, 2) is screwed on by means of the flap (13) when it is folded up.
- the ring surface (7) of the tensioning wheel (4) lies against the grinding wheel and is tensioned against the grinding wheel while the plate spring (10) is under tension.
- a non-rotatable frictional connection is created between the nut part (1, 2) and the tensioning disc (4) caused by the plate spring (10) and thus also a non-rotatable frictional connection between the tensioning disc (4) and the grinding wheel.
- the upper limit of the transmittable torque is limited by the tensioning force of the plate spring (10) and by the axial needle bearing (9) preventing further clamping of the plate spring (10). It is dimensioned so that it is sufficient for normal operation of the grinding wheel.
- a friction or form fit could also be specifically designed between the washer (8) and the inner edge (11) of the plate spring (10), so that the plate spring (10) with its outer edge (12) on the tension plate (4 ) slips through.
- This has the advantage that a larger part of the axial forces is transmitted via the thrust bearing (9). This lowers the torque required to release the tensioning device.
- the flap (13) is folded up and the nut part (1, 2) is loosened with it, whereby the plate spring (10) relaxes and the ring surface (7) of the tensioning disk (4) is released from the grinding disk .
- the plate spring (10) ensures that the tension disc (4) loosens in relation to the nut part (1,2) before the tensioning disc (4) detaches from the grinding disc. This is cheap because otherwise the clamping device would be unscrewed from the threaded spindle in the clamped state.
- the described mode of operation takes place in a flat characteristic area of the plate spring (10).
- the spring distance is only a fraction of a ⁇ m, for example 2/10 ⁇ m.
- the plate spring (10) is preloaded.
Abstract
Bei einer Spanneinrichtung zum Festlegen eines scheibenförmigen Werkzeugs an einer Gewindespindel einer Handwerkzeugmaschine drückt ein auf die Gewindespindel aufschraubbares Mutterteil(1,2) eine Spannscheibe(4) gegen das Werkzeug. Zwischen dem Mutterteil(1,2) und der Spannscheibe(4) ist ein Axial-Wälzlager(9) angeordnet. Um ein einfaches und sicheres manuelles Spannen und Lösen, verbunden mit einer Rutschkupplungfunktion bei Überlast, zu erreichen, ist zwischen der Spannscheibe(4) und dem Mutterteil(1,2) neben dem Axial-Wälzlager(9) eine Feder(10) angeordnet. Die Feder(10) bildet eine drehfeste Reibschlußverbindung zwischen dein Mutterteil(1,2) und der Spannscheibe(4). Das Axial-Nadellager(9) stützt die Spannscheibe(4) am Mutterteil(1,2) ab. Bei Überschreiten eines oberen Grenzwertes des übertragenen Drehmoments rutscht das Mutterteil(1,2) gegenüber der Spannscheibe(4) durch und das Axial-Wälzlager(9) rotiert. <IMAGE>In a clamping device for fixing a disk-shaped tool to a threaded spindle of a hand-held power tool, a nut part (1, 2) that can be screwed onto the threaded spindle presses a clamping disk (4) against the tool. An axial roller bearing (9) is arranged between the nut part (1, 2) and the spring washer (4). In order to achieve simple and safe manual tensioning and loosening, combined with a slip clutch function in the event of an overload, a spring (10) is arranged between the tensioning disc (4) and the nut part (1,2) next to the axial roller bearing (9). The spring (10) forms a non-rotatable frictional connection between your nut part (1,2) and the clamping washer (4). The axial needle bearing (9) supports the tensioning disc (4) on the nut part (1,2). If an upper limit value of the transmitted torque is exceeded, the nut part (1,2) slips against the tensioning disc (4) and the axial roller bearing (9) rotates. <IMAGE>
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 fixing a disk-shaped tool, in particular grinding wheel, to a threaded spindle of a hand-held power tool, a nut part that can be screwed onto the threaded spindle presses a clamping disk against the tool and an axial roller bearing is arranged between your nut part and the clamping disk.
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 clamping device, for example, a grinding wheel is to be attached to an angle grinder. The clamping device is an independent part, so that angle grinders can also be retrofitted with conventional threaded spindles 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 described in DE-OS 21 56 770. The axial roller bearing is intended to substantially eliminate the friction between the tool or the tensioning washer lying against it and your nut part. As a result, the mother does not pull tighter in the company. The nut must therefore be tightened sufficiently before starting operation by means of a wrench to transmit the torque from the threaded spindle to the grinding wheel. In practice, this requires a wrench. At In this design, the entire torque is transmitted to the grinding wheel via a flange of the threaded spindle. The tensioning wheel itself does not transmit any torque to 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 describes a tensioning device in which the tensioning disk is wedged with the nut part by clamping parts for torque transmission. To relax the clamping device, the clamping parts are released radially by actuating a rotating ring. The nut part tightens accordingly under extreme loads. The tensioning device of DE 37 05 638 C1 does not have a slip clutch function. The overall height of this clamping device is comparatively large, which bothers when working. Since the rotating ring is close to the grinding wheel, actuation is not very convenient in practice.
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.A similar quick release device is described in DE 40 31 725 A1. Spherical rolling elements between your nut part, the spring washer and your rotating ring run on specially designed raceways. 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, a lubricant ring is arranged between the nut part and the tensioning disk. Under extreme loads, the nut is tightened so much that it can only be loosened by hand. A pivotable flap is provided on the nut for actuating it.
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 describes a quick release device with a plate spring. The disc spring is intended to prevent the quick release device from detaching itself from the threaded spindle when the grinding wheel is braked. The disc spring has no effect when working with the grinding wheel; 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 to propose a tensioning device of the type mentioned at the outset, which allows simple and safe manual tensioning and loosening, combined with a slip clutch function in the event of an overload.
Erfindungsgemäß ist obige Aufgabe bei einer Spanneinrichtung der eingangs genannten Art dadurch gelöst, daß zwischen der Spannscheibe und dem Mutterteil neben dem Axial-Wälzlager eine 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 object is achieved in a tensioning device of the type mentioned in that a spring is arranged next to the axial roller bearing between the tensioning disk and the nut part, the spring for transmitting the torque from the threaded spindle to the tool a frictional connection between the nut part and forms the tensioning washer and the axial roller bearing axially supports the tensioning washer on the nut part, and that when an upper limit value of the torque (overload) is exceeded, the nut part slips relative to the tensioning disk, the axial roller bearing rotating.
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, the spring presses on the clamping washer so that it is pressed against the tool. There is thus a frictional connection for the transmission of the torque from your nut part to the clamping washer or the tool. At the start of operation, the connection is tightened until a torque value predetermined by the preload of the plate spring is reached. The axial roller bearing axially supports the tension plate on the nut part.
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 is exceeded, for example when the grinding wheel is tilted, the tensioning wheel slips relative to the nut part. A slipping clutch function is thereby achieved, by means of 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 nut part is actuated to release the clamping device. The tensioning device can be tensioned and released by hand without auxiliary tools. In a preferred embodiment of the invention, a pivotable flap can be mounted on the mother part to facilitate operability. With this the screwing of the nut part is easily possible.
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 clamping device is that all angle grinders can be easily retrofitted with a standard threaded spindle. It is also favorable that the clamping device can be manufactured in a flat design.
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.
- 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 which consists of a nut (1) and a bell (2) which is arranged in a rotationally fixed manner thereon. The nut (1) can be screwed with an internal thread (3) onto a threaded spindle, not shown, of a hand machine tool, for example an angle grinder. The threaded spindle is provided with a flange against which a grinding wheel, not shown, can be 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).A tensioning disc (4) is rotatable on the nut (1) and axially displaceable with a small stroke. A ring edge (5) of the nut (1) holds the tensioning washer (4) on the nut (1). An outer edge (6) of the bell (2) stands in front of the outer circumference of the tensioning 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 formed on the tensioning disc (4) and is used for contact with the grinding disc. The grinding wheel is thus between the flange of the threaded spindle and the annular 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). An axial needle bearing (9) is arranged between the bell (2) or the intermediate disk (8) and the tensioning disk (4), and the intermediate disk (8) serves as a running surface. An annular disc spring (10) is provided between the intermediate disc (8) and the clamping disc (4), which is supported with its inner edge (11) on the intermediate disc (8) and with its outer edge (12) on the clamping disc (4). The plate spring (10) surrounds the needle bearing (9) on its outer circumference. There are therefore two mechanically parallel transmission means between the nut part (1) and the tensioning disk (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), another spring of this type, for example a corrugated spring, could also be provided. A rubber-elastic ring could also be used as the spring (10). The plate spring (10) or the ring seals the space in which the axial needle bearing (9) is located from 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 locking lugs (14) are loaded by a further plate spring (16) and designed so that the flap (13) in a flat position on the bell (2) and in about 80 o swung up position is locked. The further disc 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), by means of which the nut part (1, 2) can be released in special malfunctions by inserting a standard two-hole nut driver.
Die Funktionsweise der beschriebenen Spanneinrichtung ist im wesentlichen folgende:
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.The functioning of the clamping device described is essentially as follows:
After the grinding wheel has been placed on the flange of the threaded spindle, the clamping device is placed on the threaded spindle and the nut part (1, 2) is screwed on by means of the flap (13) when it is folded up. The ring surface (7) of the tensioning wheel (4) lies against the grinding wheel and is tensioned against the grinding wheel while the plate spring (10) is under tension.
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.When doing this or at the latest when working with the machine tool, a non-rotatable frictional connection is created between the nut part (1, 2) and the tensioning disc (4) caused by the plate spring (10) and thus also a non-rotatable frictional connection between the tensioning disc (4) and the grinding wheel. The upper limit of the transmittable torque is limited by the tensioning force of the plate spring (10) and by the axial needle bearing (9) preventing further clamping of the plate spring (10). It is dimensioned so that it is sufficient for normal operation of the grinding wheel.
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 no relative movement in the needle bearing (9). 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 the grinding wheel is overloaded, i.e. if the upper limit of the torque is exceeded, there is a relative rotation between the tensioning wheel (4) and the bell (2). The disc spring (10) slips with its inner edge (11) on the washer (8) or the bell (2). 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, it is ensured that the gear of the machine tool is protected against overload and also against permanent and shock-like overload and that the nut part (1,2) is not so tightly clamped with the clamping disc (4) that later manual release is hardly possible is.
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, a friction or form fit could also be specifically designed between the washer (8) and the inner edge (11) of the plate spring (10), so that the plate spring (10) with its outer edge (12) on the tension plate (4 ) slips through. This has the advantage that a larger part of the axial forces is transmitted via the thrust bearing (9). This lowers the torque required to release the tensioning device.
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) is folded up and the nut part (1, 2) is loosened with it, whereby the plate spring (10) relaxes and the ring surface (7) of the tensioning disk (4) is released from the grinding disk . Normally, unscrewing the tensioning device is easily possible without tools, because the torque limitation described prevents the tensioning disk (4) from being over-tightened relative to the nut part (1, 2) and the axial needle bearing (9) is provided. In addition, the plate spring (10) ensures that the tension disc (4) loosens in relation to the nut part (1,2) before the tensioning disc (4) detaches from the grinding disc. This is cheap because otherwise the clamping device would be unscrewed from the threaded spindle in the clamped state.
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 operation takes place in a flat characteristic area of the plate spring (10). The spring distance is only a fraction of a µm, for example 2/10 µm. In the assembled state of the tensioning device, the plate spring (10) is preloaded.
Claims (11)
dadurch gekennzeichnet,
daß zwischen der Spannscheibe(4) und dem Mutterteil(1,2) neben dem Axial-Wälzlager(9) eine Feder(10) angeordnet ist, wobei die Feder zur Übertragung des Drehmoments von der Gewindespindel auf das Werkzeug eine Reibschlußverbindung zwischen dem Mutterteil(1,2) und der Spannscheibe(4) bildet und das Axial-Wälzlager(9) die Spannscheibe(4) am Mutterteil(1,2) axial abstützt, und daß bei Überschreiten eines oberen Grenzwertes des Drehmoments (Überlast) das Mutterteil(1,2) gegenüber der Spannscheibe(4) durchrutscht, wobei das Axial-Wälzlager (9) rotiert.Clamping device for fixing a disk-shaped tool, in particular a grinding wheel, to a threaded spindle of a hand machine tool, a nut part which can be screwed onto the threaded spindle presses a clamping disk against the tool and an axial roller bearing is arranged between the nut part and the clamping disk,
characterized,
that between the tensioning disc (4) and the nut part (1,2) next to the axial roller bearing (9) a spring (10) is arranged, the spring for transmitting the torque from the threaded spindle to the tool a frictional connection between the nut part ( 1,2) and the spring washer (4) and the axial roller bearing (9) axially supports the spring washer (4) on the nut part (1,2), and that when an upper limit value of the torque (overload) is exceeded, the nut part (1 , 2) slips relative to the tensioning disc (4), the axial roller bearing (9) rotating.
dadurch gekennzeichnet,
daß die Feder eine Tellerfeder(10) ist.Clamping device according to claim 1,
characterized,
that the spring is a plate spring (10).
dadurch gekennzeichnet,
daß die Feder(10) unter einer Vorspannung steht und das Einstellen und Lösen der Reibschlußverbindung in einem flachen Feder-Kennlinienbereich erfolgt.Clamping device according to claim 1 or 2,
characterized,
that the spring (10) is under a prestress and the setting and releasing of the frictional connection takes place in a flat spring characteristic range.
dadurch gekennzeichnet,
daß das Axial-Wälzlager ein Nadellager(9) ist.Clamping device according to one of the preceding claims,
characterized,
that the axial roller bearing is a needle bearing (9).
dadurch gekennzeichnet,
daß die Tellerfeder(10) das Axial-Wälzlager(9) in der radialen Ebene umschließt.Clamping device according to one of the preceding claims,
characterized,
that the plate spring (10) surrounds the axial roller bearing (9) in the radial plane.
dadurch gekennzeichnet,
daß sich die Tellerfeder(10) an einer Zwischenscheibe(8) abstützt, die mit dein Mutterteil(1,2) in Verbindung steht.Clamping device according to one of the preceding claims,
characterized,
that the plate spring (10) is supported on an intermediate plate (8) which is connected to your nut part (1, 2).
dadurch gekennzeichnet,
daß das Mutterteil von einer Mutter(1) und einer an dieser verdrehfest angeordneten Glocke(2) gebildet ist.Clamping device according to one of the preceding claims,
characterized,
that the nut part is formed by a nut (1) and a bell (2) arranged on it in a manner fixed against relative rotation.
dadurch gekennzeichnet,
daß die Glocke(2) die Spannscheibe(4) außen umgreift.Clamping device according to claim 7,
characterized,
that the bell (2) engages around the clamping disc (4) on the outside.
dadurch gekennzeichnet,
daß am Mutterteil(1,2) eine schwenkbare Klappe(13) zur Betätigung des Mutterteils(1,2) gelagert ist.Clamping device according to one of the preceding claims,
characterized,
that a pivotable flap (13) for actuating the nut part (1,2) is mounted on the nut part (1,2).
dadurch gekennzeichnet,
daß die Klappe(13) mittels einer Feder(16) in Arretierstellung belastet ist.Clamping device according to claim 9,
characterized,
that the flap (13) is loaded in the locking position by means of a spring (16).
dadurch gekennzeichnet,
daß die Klappe(13) so gestaltet und angeordnet ist, daß sie sich unter Fliehkraftwirkung des rotierenden Mutterteils(1,2) aus der aufgeklappten Stellung an dieses anlegt.Clamping device according to claim 9 or 10,
characterized,
that the flap (13) is designed and arranged so that it bears against the centrifugal force of the rotating nut part (1, 2) from the unfolded position.
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 true EP0732174A2 (en) | 1996-09-18 |
| EP0732174A3 EP0732174A3 (en) | 1997-07-23 |
| EP0732174B1 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19732263A1 (en) * | 1997-07-26 | 1999-01-28 | Schaeffler Waelzlager Ohg | Clamping device for releasably fastening a disk-shaped tool |
| US10818450B2 (en) | 2017-06-14 | 2020-10-27 | Black & Decker Inc. | Paddle switch |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD424076S (en) * | 1999-02-24 | 2000-05-02 | Black & Decker Inc. | Mounting device for a cutting tool |
| USD417598S (en) * | 1999-02-24 | 1999-12-14 | Black & Decker Inc. | Rotatable cutting tool |
| US6439091B1 (en) * | 1999-04-19 | 2002-08-27 | Black & Decker Inc. | Clutch mechanism |
| DE10017457A1 (en) * | 2000-04-07 | 2001-10-11 | Bosch Gmbh Robert | Grinder tool holder |
| DE10017458A1 (en) * | 2000-04-07 | 2001-10-18 | Bosch Gmbh Robert | Tool holder for a grinding machine has insert tool actively connected to drive shaft through follower device with positive engagement through spring-tensioned detent element |
| DE10030586A1 (en) * | 2000-06-21 | 2002-01-10 | Bruno Schmitz Schleifmittelwer | Tool |
| US6645058B2 (en) | 2000-11-30 | 2003-11-11 | Black & Decker Inc. | Clamp mechanism for rotary tool disc |
| US6863596B2 (en) * | 2001-05-25 | 2005-03-08 | 3M Innovative Properties Company | Abrasive article |
| DE10136459A1 (en) * | 2001-07-26 | 2003-02-13 | Bosch Gmbh Robert | System with implement holder, especially grinding disc has detent movably mounted against spring force, with hub ad axial protuberance |
| US6743085B2 (en) | 2001-11-20 | 2004-06-01 | 3M Innovative Properties Company | Rotating back up abrasive disc assembly |
| DE10205848C2 (en) * | 2002-02-13 | 2003-12-04 | Metabowerke Gmbh | Clamping nut for fixing a disk-shaped tool |
| US8087977B2 (en) | 2005-05-13 | 2012-01-03 | Black & Decker Inc. | Angle grinder |
| DE102014102705B4 (en) | 2014-02-28 | 2020-06-18 | Metabowerke Gmbh | Clamping nut |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2156770A1 (en) * | 1971-11-16 | 1973-05-30 | Hermann Hefner | DEVICE FOR THE RELEASABLE FIXING OF A GRINDING DISC OR THE SAME ON A DRIVE SPINDLE |
| DE3012836A1 (en) * | 1980-04-02 | 1981-10-08 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Angle-grinder disc clamping equipment - has clamping flange supported by spring from nut with centring boss |
| WO1990006210A1 (en) * | 1988-12-07 | 1990-06-14 | Robert Bosch Gmbh | Hand tool with a multipart, manually operated quick-change clamping device |
| DE4238466C1 (en) * | 1992-11-16 | 1994-01-20 | Metabowerke Kg | Quick acting clamping nut for securing grinding wheels etc. - has wheel forced against spindle flange by spring loaded disk which holds wheel away from nut face after nut is loosened by spindle braking |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3644979A1 (en) * | 1986-12-24 | 1988-07-07 | Pav Praezisions Apparatebau Ag | Slide gauge |
| DE3644441A1 (en) * | 1986-12-24 | 1988-07-07 | Bosch Gmbh Robert | TENSIONING DEVICE FOR DETACHABLE FASTENING OF A TOOL, IN PARTICULAR A DISC |
| DE3702142C2 (en) * | 1987-01-24 | 1995-09-21 | Bosch Gmbh Robert | Clamping device for axially clamping a tool, in particular a cutting tool designed as a disk |
| DE3705638C1 (en) * | 1987-02-21 | 1988-09-08 | Bosch Gmbh Robert | Clamping device for axially clamping a disk-shaped tool, in particular a grinding wheel, on a flange of a driven spindle |
| DE3917345A1 (en) * | 1989-05-27 | 1990-11-29 | Licentia Gmbh | Non-slip wheel clamping device for angle grinder - has serrated collar and wheel flange faces to increase clamping according to wheel loading |
| HUT70006A (en) * | 1990-09-12 | 1995-09-28 | Matthews | Fastener particularly for grinding wheel |
| DE4031725A1 (en) * | 1990-10-06 | 1992-04-09 | Bosch Gmbh Robert | QUICK-RELEASE DEVICE, IN PARTICULAR FOR FASTENING DISC-SHAPED TOOLS ON A DRIVE SPINDLE OF A HAND TOOL |
| JPH081805Y2 (en) * | 1991-03-20 | 1996-01-24 | リョービ株式会社 | Tool attachment / detachment device |
| FR2698032B1 (en) * | 1992-11-16 | 1995-10-06 | Metabowerke Gmbh | QUICK TIGHTENING DEVICE FOR AXIAL TIGHTENING OF A DISC-SHAPED TOOL. |
| DE4243328C1 (en) * | 1992-12-22 | 1994-06-09 | Metabowerke Kg | Quick clamping device for axial fixture of disc-shaped tool, partic. grinding disc - has flange of driven spindle with clamping component provided with thread screwable with thread of spindle |
-
1995
- 1995-03-14 DE DE19509147A patent/DE19509147C1/en not_active Expired - Lifetime
- 1995-12-21 DE DE59502759T patent/DE59502759D1/en not_active Expired - Lifetime
- 1995-12-21 EP EP95120336A patent/EP0732174B1/en not_active Expired - Lifetime
-
1996
- 1996-01-31 US US08/594,472 patent/US5707275A/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2156770A1 (en) * | 1971-11-16 | 1973-05-30 | Hermann Hefner | DEVICE FOR THE RELEASABLE FIXING OF A GRINDING DISC OR THE SAME ON A DRIVE SPINDLE |
| DE3012836A1 (en) * | 1980-04-02 | 1981-10-08 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Angle-grinder disc clamping equipment - has clamping flange supported by spring from nut with centring boss |
| WO1990006210A1 (en) * | 1988-12-07 | 1990-06-14 | Robert Bosch Gmbh | Hand tool with a multipart, manually operated quick-change clamping device |
| DE4238466C1 (en) * | 1992-11-16 | 1994-01-20 | Metabowerke Kg | Quick acting clamping nut for securing grinding wheels etc. - has wheel forced against spindle flange by spring loaded disk which holds wheel away from nut face after nut is loosened by spindle braking |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19732263A1 (en) * | 1997-07-26 | 1999-01-28 | Schaeffler Waelzlager Ohg | Clamping device for releasably fastening a disk-shaped tool |
| WO1999004928A2 (en) * | 1997-07-26 | 1999-02-04 | INA Wälzlager Schaeffler oHG | Clamping device for fixing a disk-shaped tool capable of being released |
| WO1999004928A3 (en) * | 1997-07-26 | 1999-04-15 | Schaeffler Waelzlager Ohg | Clamping device for fixing a disk-shaped tool capable of being released |
| US10818450B2 (en) | 2017-06-14 | 2020-10-27 | Black & Decker Inc. | Paddle switch |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0732174B1 (en) | 1998-07-08 |
| DE59502759D1 (en) | 1998-08-13 |
| EP0732174A3 (en) | 1997-07-23 |
| US5707275A (en) | 1998-01-13 |
| DE19509147C1 (en) | 1996-05-23 |
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