EP1417074B1 - Manual machine-tool comprising a braking means - Google Patents
Manual machine-tool comprising a braking means Download PDFInfo
- Publication number
- EP1417074B1 EP1417074B1 EP02742716A EP02742716A EP1417074B1 EP 1417074 B1 EP1417074 B1 EP 1417074B1 EP 02742716 A EP02742716 A EP 02742716A EP 02742716 A EP02742716 A EP 02742716A EP 1417074 B1 EP1417074 B1 EP 1417074B1
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- EP
- European Patent Office
- Prior art keywords
- power tool
- annular
- portable power
- braking means
- tool according
- 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
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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
- B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
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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
- B24B23/005—Auxiliary devices used in connection with portable grinding machines, e.g. holders
Definitions
- the invention relates to a hand tool according to the preamble of claim 1.
- the document DE 199 52 108 A1 discloses a hand tool machine, in particular a motor-driven hand grinding machine, which has a motor arranged in a housing with a drive shaft.
- the drive shaft is connected with its side facing away from the motor via an eccentric sleeve with a sanding pad.
- a second annular means with a radially inwardly facing, with the first rolling surface corresponding, second rolling surface is rotatably mounted on the eccentric sleeve via a second bearing coaxial with the central axis of the drive shaft of the motor.
- the second means is surrounded by a portion of an elastic band which forms a braking means.
- the second annular means rotatably fixed.
- the first rolling surface of the first annular means may roll on the second rolling surface of the second annular means, resulting in a rotational movement of the grinding plate. If the brake means is released, the second means is rotatable, and a positive drive is inhibited.
- the invention is based on a hand tool, in particular an eccentric grinding machine, which has a motor arranged in a housing with a drive shaft, wherein the drive shaft is connected with its side facing away from the motor via an eccentric with a sanding pad on an annular, rotatably mounted and braking means via a braking means is rollable.
- the annular means is mounted in the brake means.
- components, in particular bearing components, and space can be saved, and it is a robust and inexpensive device achievable, which builds compact especially in the axial direction.
- an encapsulated construction with internal friction surfaces can be realized, whereby they can be particularly easily protected against contamination, in particular by grinding dust.
- a high rotational speed of the grinding disc can be achieved by a friction prevailing in a grinding pad bearing and by the absence of friction between the grinding pad and the material.
- the annular means is permanently in operative connection with the sanding pad, it can be advantageously prevented by a forced friction between the annular means and the braking means that the sanding disc is being turned up.
- a separate component for speed reduction, in particular a rotatably connected to the housing rubber lip is avoidable. It can be avoided additional friction on the sanding pad and a resulting additional stress on the sanding pad.
- the annular means has a toothing on which the sanding pad can be rolled over a corresponding toothing, it is advantageously possible to achieve a secure and slip-free connection with a high level of efficiency.
- the connection between the annular means and the sanding pad may also be formed as a pure friction connection or as a connection with an undefined toothing.
- the annular means formed by a belt a low-cost standard component can be used, which has a low weight.
- the belt is made of rubber, a high friction with a small contact pressure can advantageously be achieved between the annular means and the brake means.
- the belt can also be made of other components and / or other materials that make the expert as appropriate appear, be formed, such as plastic, aluminum, etc.
- the annular means is formed by a gear made of aluminum, it is particularly advantageous friction heat can be removed via the annular means.
- annular means is trapezoidal in cross-section, a large contact surface is achieved between the braking means and the annular means, with which the torque occurring between the annular means and the braking means can advantageously be transferred. Furthermore, an advantageous guidance of the annular means in the brake means can be achieved.
- annular means and the braking means are used purely to avoid a high rotation of the sanding pad.
- a torque acting between the annular means and the braking means is particularly advantageously adjustable via a switching device. If the annular means locked in rotation in the braking means, a positive drive can be achieved, and the sanding pad can roll on the annular means. Due to the rolling motion, an orbital movement of the grinding disc mounted eccentrically to the motor shaft can be combined with a rotational movement of the grinding disc, and a movement of the grinding disc can be achieved with which a high removal of the material to be machined can be achieved.
- the braking means open and is the annular Means rotatably mounted in the brake means, a freewheeling of the sanding pad and a particularly fine machining of a surface can be achieved.
- the braking means is loaded via at least one spring element, a constant effect of the moment acting on the annular means can be achieved, namely when the spring element acts in the closing direction of the braking means, or a secure opening of the braking means can be achieved if the spring element in the opening direction the braking agent acts. If the spring element acts in the closing direction, wear between the annular means and the braking means can be compensated. If the spring element acts in the opening direction of the brake means, it is always possible to ensure reliable opening of the brake means and operation with a low removal of material.
- the spring element may be formed by a separate component, such as a loaded on train or pressure coil spring, etc., or may be integral with the brake means, for example by the braking means is formed of spring steel.
- a braking effect is generated by a force acting in the axial direction of the braking means, whereby jamming of the annular means in the braking means can be safely avoided. Furthermore, cost-effective braking means and annular means can be achieved with simple cross-sectional geometries.
- the braking means can be made in one or more parts. However, if the braking means is at least in two parts, a particularly simple assembly can be achieved, wherein the braking means can be divided into different levels that appear appropriate to a person skilled in the art.
- the braking means has at least two, about a pivot axis pivoting jaws. It can be achieved structurally simple advantageous advantageous loading of the annular means by the braking means.
- the pivot axis is arranged on a side opposite the switching device. It is a large lever arm accessible via which the annular means in the braking means on the switching device with a small force can be locked, and the power tool can be switched with little effort in the forced mode.
- the jaws can be integrally connected to each other in the region of the pivot axis or can be designed to be split in the region of the pivot axis, for example by being held together by a joint shell molded onto the housing.
- FIG. 1 shows a partial section of an eccentric grinder with an electric motor 12 arranged in a housing 10 and having a drive shaft 14. On a side facing away from the electric motor 12, the drive shaft 14 is connected via an eccentric 18 with a sanding pad 16.
- the sanding pad 16 is rotatably mounted eccentrically to the drive shaft 14 via a pin 38 and a sanding pad bearing 40 in the eccentric 18 and is connected via a screw 42 fixed to the pin 38.
- the sanding pad 16 has, on its side facing the electric motor 12, a sanding pad carrier 44 carrying a sanding pad 66 with a collar 46 pointing in the axial direction to the electric motor 12 (FIG. 1).
- the federal government 46 indicates its radially outwardly facing side a toothing 26 which engages in a corresponding, radially inwardly facing toothing 24 of an annular means 20 and is permanently in operative connection with the toothing 24 of the annular means 20.
- the annular means 20 formed by a rubber belt has a trapezoidal cross-section and is rotatably mounted in a trapezoidal in cross-section recess 48 of a substantially annular braking means 22 ( Figures 1 and 2).
- the concentric with the drive shaft 14 rotatably mounted in the housing 10 brake means 22 surrounds the rubber belt 20 almost completely in its circumferential direction.
- the braking means 22 has a first, the sanding pad 16 facing away from and a second, the sanding pad 16 facing unit, wherein the units are each divided into two semi-circular jaws 34, 36.
- the jaws 34, 36 are pivotably mounted about a pivot axis 32 in a joint shell 74 formed on the housing 10. On the opposite side of the pivot axis 32, the jaws 34, 36 are connected via a switching device 28 (FIG. 2).
- a first and on the jaws 34, a second extending in the radial direction extension 50, 52 is integrally formed on the jaws 36 (FIG. 2).
- An outer side of the first extension 50 is connected to an eccentric 54 of the switching device 28 in operative connection, while an outer side of the second extension 52 is supported on the housing 10.
- a pressure-loaded helical compression spring 30 is supported with its ends on the opposite inner sides of the extensions 50, 52 and loads the brake means 22 in its opening direction.
- the eccentric 54 is connected via a screw 56 to a lever 58 of the switching device 28 (FIG. 2).
- a torque acting between the rubber belt 20 and the braking means 22 can be adjusted by an operator via the lever 58 and the eccentric 54 of the switching device 28 on the brake means 22.
- the eccentric grinder is in its freewheeling mode, pushes the helical compression spring 30 via the extensions 50, 52, the braking means 22 apart so far that the rubber belt 20 is mounted virtually frictionless in the recess 48. A remaining residual friction between the braking means 22 and the rubber belt 20 prevents unwanted upward rotation of the grinding plate 16, when it is lifted during operation of a surface to be machined.
- the brake means 22 is loaded via the eccentric 54 against a spring force of the helical compression spring 30, namely until the rubber belt 20 is held against rotation in the brake means 22, whereby a positive drive is produced.
- the eccentrically mounted sanding pad 16 can roll with its teeth 26 on the toothing 24 of the concentric and rotationally fixed in the brake means 22 mounted rubber belt 20 at a constant speed. In addition to the orbital movement of the sanding pad 16 this performs a rotational movement by rolling on the rubber belt 20 by.
- Fig. 3 shows an alternative to Fig. 1 and 2 brake means 62.
- Substantially identical components are basically numbered by the same reference numerals.
- the brake means 62 which faces away in the axial direction into a first, one sanding pad and into a second, the sanding pad facing unit is loadable via a switching device 28 in the axial direction to generate a braking effect.
- the units each have a circular jaw 64, 64 ', each having in the radially outer region each pointing to the other unit collar 68, 70, wherein a rubber ring 72 with a substantially rectangular cross section in the radial direction through the collars 68, 70 out is.
- a plurality of helical compression springs 60 are arranged, which load the brake means 62 in its opening direction.
- the jaw 64 is adjustable via an eccentric 54 in the axial direction.
- the jaws 64, 64 'could also be adjusted in the axial direction by other devices which appear to be suitable for a person skilled in the art, such as a thread, etc.
- a corrugated disc spring could also be used, which is located between one of the two circular jaws 64, 64 'and the rubber ring 72 could be arranged.
- the corrugated diaphragm spring could be there Compensate tolerances and wear between the individual components.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Braking Arrangements (AREA)
- Automatic Tool Replacement In Machine Tools (AREA)
Abstract
Description
Die Erfindung geht aus von einer Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a hand tool according to the preamble of claim 1.
Aus der Druckschrift DE 199 52 108 A1 ist eine Handwerkzeugmaschine, insbesondere eine motorgetriebene Handschleifmaschine, bekannt, die einen in einem Gehäuse angeordneten Motor mit einer Antriebswelle aufweist. Die Antriebswelle ist mit ihrer dem Motor abgewandten Seite über eine Exzenterhülse mit einem Schleifteller verbunden. Am Schleifteller, der über ein erstes Lager auf der Exzenterhülse exzentrisch zur Antriebswelle gelagert ist, ist ein erstes ringförmiges Mittel angeformt, das eine erste, radial nach außen weisende Wälzfläche aufweist. Ein zweites ringförmiges Mittel mit einer radial nach innen weisenden, mit der ersten Wälzfläche korrespondierenden, zweiten Wälzfläche ist über ein zweites Lager koaxial zur zentrischen Achse der Antriebswelle des Motors drehbar auf der Exzenterhülse gelagert.The document DE 199 52 108 A1 discloses a hand tool machine, in particular a motor-driven hand grinding machine, which has a motor arranged in a housing with a drive shaft. The drive shaft is connected with its side facing away from the motor via an eccentric sleeve with a sanding pad. On the sanding pad, which is mounted eccentrically to the drive shaft via a first bearing on the eccentric sleeve, a first annular means is formed, which has a first, radially outwardly facing rolling surface. A second annular means with a radially inwardly facing, with the first rolling surface corresponding, second rolling surface is rotatably mounted on the eccentric sleeve via a second bearing coaxial with the central axis of the drive shaft of the motor.
Das zweite Mittel ist über einen Teilbereich von einem elastischen Band umgeben, das ein Bremsmittel bildet. Über das Bremsmittel ist für einen Zwangsantrieb bzw. für einen eine orbitale Bewegung überlagerten rotierenden Antrieb des Schleiftellers das zweite ringförmige Mittel drehfest fixierbar. Die erste Wälzfläche des ersten ringförmigen Mittels kann sich auf der zweiten Wälzfläche des zweiten ringförmigen Mittels abwälzen, was zu einer Drehbewegung des Schleiftellers führt. Wird das Bremsmittel gelöst, ist das zweite Mittel drehbar, und ein Zwangsantrieb wird unterbunden.The second means is surrounded by a portion of an elastic band which forms a braking means. About the braking means for a positive drive or for an orbital motion superimposed rotary drive of the sanding pad, the second annular means rotatably fixed. The first rolling surface of the first annular means may roll on the second rolling surface of the second annular means, resulting in a rotational movement of the grinding plate. If the brake means is released, the second means is rotatable, and a positive drive is inhibited.
Die Erfindung geht aus von einer Handwerkzeugmaschine, insbesondere von einer Exzenterschleifmaschine, die einen in einem Gehäuse angeordneten Motor mit einer Antriebswelle aufweist, wobei die Antriebswelle mit ihrer dem Motor abgewandten Seite über einen Exzenter mit einem Schleifteller verbunden ist, der auf einem ringförmigen, drehbar gelagerten und über ein Bremsmittel bremsbaren Mittel abwälzbar ist.The invention is based on a hand tool, in particular an eccentric grinding machine, which has a motor arranged in a housing with a drive shaft, wherein the drive shaft is connected with its side facing away from the motor via an eccentric with a sanding pad on an annular, rotatably mounted and braking means via a braking means is rollable.
Es wird vorgeschlagen, daß das ringförmige Mittel im Bremsmittel gelagert ist. Vorteilhaft können Bauteile, insbesondere Lagerbauteile, und Bauraum eingespart werden, und es ist eine robuste und kostengünstige Vorrichtung erreichbar, die insbesondere in axialer Richtung kompakt baut. Ferner ist eine abgekapselte Bauweise mit innenliegenden Reibflächen realisierbar, wodurch diese besonders einfach gegen eine Verschmutzung, insbesondere durch Schleifstaub, geschützt werden können.It is proposed that the annular means is mounted in the brake means. Advantageously, components, in particular bearing components, and space can be saved, and it is a robust and inexpensive device achievable, which builds compact especially in the axial direction. Furthermore, an encapsulated construction with internal friction surfaces can be realized, whereby they can be particularly easily protected against contamination, in particular by grinding dust.
Hebt ein Bediener die Handwerkzeugmaschine während des Betriebs von einer zu bearbeitenden Oberfläche eines Werkstoffs, kann durch eine in einem Schleiftellerlager vorherrschende Reibung und durch das Fehlen einer Reibung zwischen dem Schleifteller und dem Werkstoff eine hohe Drehzahl des Schleiftellers erreicht werden. Steht das ringförmige Mittel mit dem Schleifteller permanent in Wirkverbindung, kann durch eine Zwangsreibung zwischen dem ringförmigen Mittel und dem Bremsmittel ein Hochdrehen des Schleiftellers vorteilhaft verhindert werden. Ein separates Bauteil zur Drehzahlreduzierung, insbesondere eine mit dem Gehäuse drehfest verbundene Gummilippe, ist vermeidbar. Es kann eine zusätzliche Reibung am Schleifteller und eine daraus resultierende zusätzliche Beanspruchung des Schleiftellers vermieden werden.If an operator raises the hand tool machine during operation from a surface of a material to be machined, a high rotational speed of the grinding disc can be achieved by a friction prevailing in a grinding pad bearing and by the absence of friction between the grinding pad and the material. If the annular means is permanently in operative connection with the sanding pad, it can be advantageously prevented by a forced friction between the annular means and the braking means that the sanding disc is being turned up. A separate component for speed reduction, in particular a rotatably connected to the housing rubber lip is avoidable. It can be avoided additional friction on the sanding pad and a resulting additional stress on the sanding pad.
Weist das ringförmige Mittel eine Verzahnung auf, auf der der Schleifteller über eine korrespondierende Verzahnung abwälzbar ist, kann vorteilhaft eine sichere und schlupffreie Verbindung mit einem hohen Wirkungsgrad erreicht werden. Die Verbindung zwischen dem ringförmigen Mittel und dem Schleifteller kann jedoch auch als reine Reibverbindung oder auch als Verbindung mit einer undefinierten Verzahnung ausgebildet sein.If the annular means has a toothing on which the sanding pad can be rolled over a corresponding toothing, it is advantageously possible to achieve a secure and slip-free connection with a high level of efficiency. However, the connection between the annular means and the sanding pad may also be formed as a pure friction connection or as a connection with an undefined toothing.
Ist das ringförmige Mittel von einem Riemen gebildet, kann ein kostengünstiges Standardbauteil verwendet werden, welches ein geringes Gewicht aufweist. Ist der Riemen aus Gummi, kann zwischen dem ringförmigen Mittel und dem Bremsmittel vorteilhaft eine hohe Reibung mit einer kleinen Anpreßkraft erreicht werden. Der Riemen kann jedoch auch von anderen Bauteilen und/oder aus anderen Materialien, die dem Fachmann als sinnvoll erscheinen, gebildet sein, wie z.B. aus Kunststoff, Aluminium usw. Wird das ringförmige Mittel von einem Zahnrad aus Aluminium gebildet, kann besonders vorteilhaft Reibungswärme über das ringförmige Mittel abgeführt werden.If the annular means formed by a belt, a low-cost standard component can be used, which has a low weight. If the belt is made of rubber, a high friction with a small contact pressure can advantageously be achieved between the annular means and the brake means. However, the belt can also be made of other components and / or other materials that make the expert as appropriate appear, be formed, such as plastic, aluminum, etc. If the annular means is formed by a gear made of aluminum, it is particularly advantageous friction heat can be removed via the annular means.
Ist das ringförmige Mittel in seinem Querschnitt trapezförmig ausgebildet, ist zwischen dem Bremsmittel und dem ringförmigen Mittel eine große Kontaktfläche erreichbar, mit der das zwischen dem ringförmigen Mittel und dem Bremsmittel auftretende Moment vorteilhaft übertragen werden kann. Ferner kann eine vorteilhafte Führung des ringförmigen Mittels im Bremsmittel erreicht werden.If the annular means is trapezoidal in cross-section, a large contact surface is achieved between the braking means and the annular means, with which the torque occurring between the annular means and the braking means can advantageously be transferred. Furthermore, an advantageous guidance of the annular means in the brake means can be achieved.
Grundsätzlich ist denkbar, daß das ringförmige Mittel und das Bremsmittel rein zur Vermeidung eines Hochdrehens des Schleiftellers genutzt werden. Besonders vorteilhaft ist jedoch ein zwischen dem ringförmigen Mittel und dem Bremsmittel wirkendes Moment über eine Schaltvorrichtung einstellbar. Wird das ringförmige Mittel drehfest im Bremsmittel arretiert, kann ein Zwangsantrieb erreicht werden, und der Schleifteller kann sich auf dem ringförmigen Mittel abwälzen. Durch die Abwälzbewegung ist eine Orbitalbewegung des zur Motorwelle exzentrisch gelagerten Schleiftellers mit einer Rotationsbewegung des Schleiftellers kombinierbar, und es ist eine Bewegung des Schleiftellers erreichbar, mit der ein hoher Abtrag am zu bearbeitenden Werkstoff erreicht werden kann. Wird das eingestellte Moment überschritten, kann ein Rutschen des ringförmigen Mittels im Bremsmittel erreicht werden, und ein Überlasten des Motors, insbesondere bei einem Blockieren des Schleiftellers, kann vorteilhaft vermieden werden. Ist das Bremsmittel geöffnet und ist das ringförmige Mittel im Bremsmittel drehbar gelagert, kann ein Freilauf des Schleiftellers und eine besonders feine Bearbeitung einer Oberfläche erreicht werden.In principle, it is conceivable that the annular means and the braking means are used purely to avoid a high rotation of the sanding pad. However, a torque acting between the annular means and the braking means is particularly advantageously adjustable via a switching device. If the annular means locked in rotation in the braking means, a positive drive can be achieved, and the sanding pad can roll on the annular means. Due to the rolling motion, an orbital movement of the grinding disc mounted eccentrically to the motor shaft can be combined with a rotational movement of the grinding disc, and a movement of the grinding disc can be achieved with which a high removal of the material to be machined can be achieved. If the set torque is exceeded, slippage of the annular means in the braking means can be achieved, and overloading of the motor, in particular when the grinding disc is blocked, can advantageously be avoided. Is the braking means open and is the annular Means rotatably mounted in the brake means, a freewheeling of the sanding pad and a particularly fine machining of a surface can be achieved.
Ist das Bremsmittel über zumindest ein Federelement belastet, kann eine gleichbleibende Wirkung des auf das ringförmige Mittel wirkenden Moments erreicht werden, und zwar wenn das Federelement in Schließrichtung des Bremsmittels wirkt, oder es kann ein sicheres Öffnen des Bremsmittels erreicht werden, wenn das Federelement in Öffnungsrichtung des Bremsmittels wirkt. Wirkt das Federelement in Schließrichtung, kann ein Verschleiß zwischen dem ringförmigen Mittel und dem Bremsmittel ausgeglichen werden. Wirkt das Federelement in Öffnungsrichtung des Bremsmittels, kann stets ein sicheres Öffnen des Bremsmittels und ein Betrieb mit einem geringen Materialabtrag sichergestellt werden. Das Federelement kann von einem separaten Bauteil gebildet sein, wie beispielsweise von einer auf Zug oder Druck belasteten Schraubendruckfeder usw., oder kann einstückig mit dem Bremsmittel ausgeführt sein, beispielsweise indem das Bremsmittel aus Federstahl gebildet ist.If the braking means is loaded via at least one spring element, a constant effect of the moment acting on the annular means can be achieved, namely when the spring element acts in the closing direction of the braking means, or a secure opening of the braking means can be achieved if the spring element in the opening direction the braking agent acts. If the spring element acts in the closing direction, wear between the annular means and the braking means can be compensated. If the spring element acts in the opening direction of the brake means, it is always possible to ensure reliable opening of the brake means and operation with a low removal of material. The spring element may be formed by a separate component, such as a loaded on train or pressure coil spring, etc., or may be integral with the brake means, for example by the braking means is formed of spring steel.
In einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, daß eine Bremswirkung durch eine in axialer Richtung wirkenden Kraft auf das Bremsmittel erzeugt ist, wodurch ein Verklemmen des ringförmigen Mittels im Bremsmittel sicher vermieden werden kann. Ferner können kostengünstige Bremsmittel und ringförmige Mittel mit einfachen Querschnittsgeometrien erreicht werden.In a further embodiment of the invention it is proposed that a braking effect is generated by a force acting in the axial direction of the braking means, whereby jamming of the annular means in the braking means can be safely avoided. Furthermore, cost-effective braking means and annular means can be achieved with simple cross-sectional geometries.
Das Bremsmittel kann einteilig oder mehrteilig ausgeführt werden. Ist das Bremsmittel jedoch zumindest zweiteilig ausgeführt, ist eine besonders einfache Montage erreichbar, wobei das Bremsmittel in verschiedenen, dem Fachmann als sinnvoll erscheinenden Ebenen geteilt sein kann.The braking means can be made in one or more parts. However, if the braking means is at least in two parts, a particularly simple assembly can be achieved, wherein the braking means can be divided into different levels that appear appropriate to a person skilled in the art.
Ferner wird vorgeschlagen, daß das Bremsmittel zumindest zwei, um eine Schwenkachse schwenkbare Backen aufweist. Es kann konstruktiv einfach eine vorteilhaft gleichmäßige Belastung des ringförmigen Mittels durch das Bremsmittel erreicht werden.It is also proposed that the braking means has at least two, about a pivot axis pivoting jaws. It can be achieved structurally simple advantageous advantageous loading of the annular means by the braking means.
Besonders vorteilhaft ist die Schwenkachse auf einer der Schaltvorrichtung gegenüberliegenden Seite angeordnet. Es ist ein großer Hebelarm erreichbar, über den das ringförmige Mittel im Bremsmittel über die Schaltvorrichtung mit einer kleinen Kraft arretierbar ist, und die Handwerkzeugmaschine kann mit geringem Kraftaufwand in den Zwangsmodus geschaltet werden. Die Backen können im Bereich der Schwenkachse einstückig miteinander verbunden oder können im Bereich der Schwenkachse geteilt ausgeführt sein, beispielsweise indem diese über eine an das Gehäuse angeformte Gelenkschale zusammengehalten werden.Particularly advantageously, the pivot axis is arranged on a side opposite the switching device. It is a large lever arm accessible via which the annular means in the braking means on the switching device with a small force can be locked, and the power tool can be switched with little effort in the forced mode. The jaws can be integrally connected to each other in the region of the pivot axis or can be designed to be split in the region of the pivot axis, for example by being held together by a joint shell molded onto the housing.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination.Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination.
Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.
Es zeigen:
- Fig. 1
- einen Teilschnitt durch einen Exzenterschleifer,
- Fig. 2
- einen Schnitt entlang der Linie II-II in Fig. 1 und
- Fig. 3
- einen Ausschnitt eines alternativen Bremsmittels.
- Fig. 1
- a partial section through an eccentric grinder,
- Fig. 2
- a section along the line II-II in Fig. 1 and
- Fig. 3
- a section of an alternative braking means.
Fig. 1 zeigt einen Teilschnitt eines Exzenterschleifers mit einem in einem Gehäuse 10 angeordneten Elektromotor 12, der eine Antriebswelle 14 aufweist. An einer dem Elektromotor 12 abgewandten Seite ist die Antriebswelle 14 über einen Exzenter 18 mit einem Schleifteller 16 verbunden. Der Schleifteller 16 ist über einen Zapfen 38 und über ein Schleiftellerlager 40 drehbar im Exzenter 18 exzentrisch zur Antriebswelle 14 gelagert und ist über eine Schraube 42 fest mit dem Zapfen 38 verbunden.1 shows a partial section of an eccentric grinder with an
Der Schleifteller 16 weist an seiner dem Elektromotor 12 zugewandten Seite einen ein Schleifkissen 66 tragenden Schleifkissenträger 44 mit einem in axialer Richtung zum Elektromotor 12 weisenden Bund 46 auf (Fig. 1). Der Bund 46 weist an seiner radial nach außen weisenden Seite eine Verzahnung 26 auf, die in eine korrespondierende, radial nach innen weisende Verzahnung 24 eines ringförmigen Mittels 20 greift und permanent mit der Verzahnung 24 des ringförmigen Mittels 20 in Wirkverbindung steht.The
Das von einem Gummiriemen gebildete ringförmige Mittel 20 besitzt einen trapezförmigen Querschnitt und ist drehbar in einer im Querschnitt trapezförmigen Ausnehmung 48 eines im wesentlichen ringförmigen Bremsmittels 22 gelagert (Fig. 1 und 2). Das konzentrisch zur Antriebswelle 14 drehfest im Gehäuse 10 gelagerte Bremsmittel 22 umschließt den Gummiriemen 20 nahezu vollständig in dessen Umfangsrichtung. Das Bremsmittel 22 besitzt eine erste, dem Schleifteller 16 abgewandte und eine zweite, dem Schleifteller 16 zugewandte Einheit, wobei die Einheiten jeweils in zwei halbkreisförmige Backen 34, 36 geteilt sind.The annular means 20 formed by a rubber belt has a trapezoidal cross-section and is rotatably mounted in a trapezoidal in
Die Backen 34, 36 sind in einer an das Gehäuse 10 angeformten Gelenkschale 74 um eine Schwenkachse 32 schwenkbar gelagert. Auf der der Schwenkachse 32 gegenüberliegenden Seite sind die Backen 34, 36 über eine Schaltvorrichtung 28 verbunden (Fig. 2).The
Auf der der Schaltvorrichtung 28 zugewandten Seite ist an den Backen 36 ein erster und an den Backen 34 ein zweiter sich in radialer Richtung erstreckender Fortsatz 50, 52 angeformt (Fig. 2). Eine Außenseite des ersten Fortsatzes 50 steht mit einem Exzenter 54 der Schaltvorrichtung 28 in Wirkverbindung, während eine Außenseite des zweiten Fortsatzes 52 sich am Gehäuse 10 abstützt. Eine auf Druck belastete Schraubendruckfeder 30 stützt sich mit ihren Enden an den gegenüberliegenden Innenseiten der Fortsätze 50, 52 ab und belastet das Bremsmittel 22 in seine Öffnungsrichtung.On the side facing the switching
Der Exzenter 54 ist über eine Schraube 56 mit einem Hebel 58 der Schaltvorrichtung 28 verbunden (Fig. 2). Ein zwischen dem Gummiriemen 20 und dem Bremsmittel 22 wirkendes Moment kann von einem Bediener über den Hebel 58 und den Exzenter 54 der Schaltvorrichtung 28 am Bremsmittel 22 eingestellt werden.The eccentric 54 is connected via a
Befindet sich der Exzenterschleifer in seinem Freilaufmodus, drückt die Schraubendruckfeder 30 über die Fortsätze 50, 52 das Bremsmittel 22 so weit auseinander, daß der Gummiriemen 20 nahezu reibungsfrei in der Ausnehmung 48 drehbar gelagert ist. Eine verbleibende Restreibung zwischen dem Bremsmittel 22 und dem Gummiriemen 20 verhindert ein unerwünschtes Hochdrehen des Schleiftellers 16, wenn dieser während des Betriebs von einer zu bearbeitenden Oberfläche abgehoben wird.The eccentric grinder is in its freewheeling mode, pushes the
Betätigt der Bediener den Hebel 58, wird das Bremsmittel 22 über den Exzenter 54 gegen eine Federkraft der Schraubendruckfeder 30 belastet, und zwar bis der Gummiriemen 20 im Bremsmittel 22 drehfest gehalten ist, wodurch ein Zwangsantrieb entsteht. Beim Zwangsantrieb kann sich der exzentrisch gelagerte Schleifteller 16 mit seiner Verzahnung 26 auf der Verzahnung 24 des konzentrisch und drehfest im Bremsmittel 22 gelagerten Gummiriemens 20 mit einer konstanten Drehzahl abwälzen. Zusätzlich zur Orbitalbewegung des Schleiftellers 16 führt dieser eine Rotationsbewegung durch das Abwälzen auf dem Gummiriemen 20 durch.If the operator actuates the
Fig. 3 zeigt ein zu Fig. 1 und 2 alternatives Bremsmittel 62. Im wesentlichen gleichbleibende Bauteile sind grundsätzlich mit den gleichen Bezugszeichen beziffert. Ferner kann bezüglich gleichbleibender Merkmale und Funktionen auf die Beschreibung zum Ausführungsbeispiel in den Fig. 1 und 2 verwiesen werden. Die nachfolgende Beschreibung beschränkt sich im wesentlichen auf die Unterschiede zum Ausführungsbeispiel in den Fig. 1 bis 2.Fig. 3 shows an alternative to Fig. 1 and 2 brake means 62. Substantially identical components are basically numbered by the same reference numerals. Furthermore, reference can be made to the description of the embodiment in Figs. 1 and 2 with respect to the same features and functions. The following description is essentially limited to the differences from the exemplary embodiment in FIGS. 1 to 2.
Das in axialer Richtung in eine erste, einem Schleifteller abgewandte und in eine zweite, dem Schleifteller zugewandte Einheit geteilte Bremsmittel 62 ist über eine Schaltvorrichtung 28 in axialer Richtung zur Erzeugung einer Bremswirkung belastbar. Die Einheiten besitzen jeweils einen kreisförmigen Backen 64, 64', die jeweils im radial äußeren Bereich einen jeweils zur anderen Einheit weisenden Bund 68, 70 aufweisen, wobei ein Gummiring 72 mit einem im wesentlichen rechteckigen Querschnitt in radiale Richtung durch die Bünde 68, 70 geführt ist. In axialer Richtung zwischen den Bünden 68, 70 sind über den Umfang verteilt mehrere Schraubendruckfedern 60 angeordnet, die das Bremsmittel 62 in seine Öffnungsrichtung belasten. Der Backen 64 ist über einen Exzenter 54 in axialer Richtung verstellbar.The brake means 62, which faces away in the axial direction into a first, one sanding pad and into a second, the sanding pad facing unit is loadable via a
Die Backen 64, 64' könnten jedoch auch über andere, dem Fachmann als sinnvoll erscheinende Vorrichtungen in axialer Richtung verstellt werden, wie beispielsweise über ein Gewinde usw. Anstatt mehreren Schraubendruckfedern 60 könnte auch eine gewellte Tellerfeder verwendet werden, die zwischen einem der beiden kreisförmigen Backen 64, 64' und dem Gummiring 72 angeordnet sein könnte. Die gewellte Tellerfeder könnte dabei Toleranzen und Verschleiß zwischen den einzelnen Bauteilen ausgleichen.The
- 1010
- Gehäusecasing
- 1212
- Motorengine
- 1414
- Antriebswelledrive shaft
- 1616
- Schleiftellersanding pad
- 1818
- Exzentereccentric
- 2020
- Mittelmedium
- 2222
- Bremsmittelbraking means
- 2424
- Verzahnunggearing
- 2626
- Verzahnunggearing
- 2828
- Schaltvorrichtungswitching device
- 3030
- Federelementspring element
- 3232
- Schwenkachseswivel axis
- 3434
- Backento bake
- 3636
- Backento bake
- 3838
- Zapfenspigot
- 4040
- SchleiftellerlagerSanding pad bearings
- 4242
- Schraubescrew
- 4444
- SchleifkissenträgerSanding pad carrier
- 4646
- BundFederation
- 4848
- Ausnehmungrecess
- 5050
- Fortsatzextension
- 5252
- Fortsatzextension
- 5454
- Exzentereccentric
- 5656
- Schraubescrew
- 5858
- Hebellever
- 6060
- Federelementspring element
- 6262
- Bremsmittelbraking means
- 6464
- Backento bake
- 6666
- Schleifkissensanding pad
- 6868
- BundFederation
- 7070
- BundFederation
- 7272
- Mittelmedium
- 7474
- Gelenkschalejoint shell
Claims (11)
- Portable power tool, in particular a random orbit sander, which has a motor (12) arranged in a housing (10) and having a drive shaft (14), the drive shaft (14), on its side remote from the motor (12), being connected via an eccentric (18) to a sanding plate (16) which can roll on an annular, rotatably mounted means (20, 72) which can be braked via a braking means (22, 62), characterized in that the annular means (20, 72) is mounted in the braking means (22, 62).
- Portable power tool according to Claim 1, characterized in that the annular means (20, 72) is permanently in operative connection with the sanding plate (16).
- Portable power tool according to Claim 1 or 2, characterized in that the annular means (20, 72) has a tooth system (24), on which the sanding plate (16) can roll via a corresponding tooth system (26).
- Portable power tool according to one of the preceding claims, characterized in that the annular means (20, 72) is formed by a belt.
- Portable power tool according to one of the preceding claims, characterized in that the annular means (20) is of trapezoidal design in cross section.
- Portable power tool according to one of the preceding claims, characterized in that a moment acting between the annular means (20, 72) and the braking means (22, 62) can be set via a control device (28).
- Portable power tool according to one of the preceding claims, characterized in that the braking means (22, 62) is loaded via at least one spring element (30, 60).
- Portable power tool according to one of the preceding claims, characterized in that a braking effect is produced on the braking means (62) by a force acting in the axial direction.
- Portable power tool according to one of the preceding claims, characterized in that the braking means (22, 62) is made at least in two parts.
- Portable power tool according to one of the preceding claims, characterized in that the braking means (22, 62) has at least two jaws (34, 36) pivotable about a pivot axis (32).
- Portable power tool according to Claims 6 and 10, characterized in that the pivot axis (32) is arranged on a side opposite the control device (28).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10134308A DE10134308A1 (en) | 2001-07-14 | 2001-07-14 | Hand tool |
| DE10134308 | 2001-07-14 | ||
| PCT/DE2002/001637 WO2003008150A1 (en) | 2001-07-14 | 2002-05-07 | Manual machine-tool comprising a braking means |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1417074A1 EP1417074A1 (en) | 2004-05-12 |
| EP1417074B1 true EP1417074B1 (en) | 2006-12-27 |
Family
ID=7691805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02742716A Expired - Lifetime EP1417074B1 (en) | 2001-07-14 | 2002-05-07 | Manual machine-tool comprising a braking means |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6890247B2 (en) |
| EP (1) | EP1417074B1 (en) |
| CN (1) | CN1246123C (en) |
| AT (1) | ATE349297T1 (en) |
| DE (2) | DE10134308A1 (en) |
| WO (1) | WO2003008150A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7128641B1 (en) * | 2005-06-08 | 2006-10-31 | Gison Machinery Co., Ltd. | Grinder capable of seizing rotary shaft |
| CN100395468C (en) * | 2005-08-08 | 2008-06-18 | 刘海平 | Automatic buncher |
| CN101890671B (en) * | 2009-02-17 | 2014-05-28 | C.&E.泛音有限公司 | Tool for grinding or polishing for an oscillation drive |
| DE102010043182A1 (en) * | 2010-10-29 | 2012-05-03 | Robert Bosch Gmbh | Portable machine tool |
| WO2013016123A1 (en) * | 2011-07-26 | 2013-01-31 | 3M Innovative Properties Company | Modular dual-action devices and related methods |
| CN103862350B (en) * | 2012-12-12 | 2017-06-27 | 苏州宝时得电动工具有限公司 | Angle grinder with push-down stop mechanism |
| DE102013100085A1 (en) | 2013-01-07 | 2014-07-10 | C. & E. Fein Gmbh | Oscillating powered machine tool |
| EP3055585B1 (en) * | 2013-10-10 | 2021-06-09 | Arbortech Industries Ltd | Rotary gear transmission for tools |
| DE102014109904A1 (en) * | 2014-07-15 | 2016-01-21 | C. & E. Fein Gmbh | Random Orbit Sander |
| DE102015121305A1 (en) * | 2015-12-08 | 2017-06-08 | Festool Gmbh | The handheld machine tool |
| US10632589B2 (en) | 2016-08-29 | 2020-04-28 | Black & Decker Inc. | Power tool |
| CN111515813A (en) * | 2020-04-30 | 2020-08-11 | 陈英杰 | Connecting device and tool unit provided with same |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3609441A1 (en) * | 1986-03-20 | 1987-09-24 | Bosch Gmbh Robert | Eccentric grinder with a device for changing the grinding movement |
| DE3642741A1 (en) * | 1986-12-13 | 1988-06-23 | Bosch Gmbh Robert | Eccentric grinder |
| DE3809930A1 (en) * | 1988-03-24 | 1989-10-05 | Bosch Gmbh Robert | Eccentric grinder |
| DE4206753A1 (en) * | 1992-03-04 | 1993-09-09 | Bosch Gmbh Robert | Eccentric disc grinder |
| DE4233729A1 (en) * | 1992-10-07 | 1994-04-14 | Bosch Gmbh Robert | Eccentric disc grinder with grinding disc brake |
| US5392568A (en) * | 1993-12-22 | 1995-02-28 | Black & Decker Inc. | Random orbit sander having braking member |
| GB9415011D0 (en) * | 1994-07-26 | 1994-09-14 | Black & Decker Inc | Improved oscillating hand tool |
| GB9423848D0 (en) * | 1994-11-25 | 1995-01-11 | Black & Decker Inc | Improved oscillating hand tool |
| JP3316622B2 (en) * | 1996-03-08 | 2002-08-19 | 株式会社マキタ | Sanda |
| DE19952108B4 (en) * | 1999-10-29 | 2007-09-20 | Robert Bosch Gmbh | Exzentertellerschleifmaschine |
| US6264539B1 (en) * | 2000-01-12 | 2001-07-24 | Tony Chen | Mechanism for slowing down idling shoe of an electric polisher |
-
2001
- 2001-07-14 DE DE10134308A patent/DE10134308A1/en not_active Ceased
-
2002
- 2002-05-07 EP EP02742716A patent/EP1417074B1/en not_active Expired - Lifetime
- 2002-05-07 US US10/333,084 patent/US6890247B2/en not_active Expired - Fee Related
- 2002-05-07 WO PCT/DE2002/001637 patent/WO2003008150A1/en active IP Right Grant
- 2002-05-07 DE DE50209089T patent/DE50209089D1/en not_active Expired - Lifetime
- 2002-05-07 CN CN02801436.7A patent/CN1246123C/en not_active Expired - Fee Related
- 2002-05-07 AT AT02742716T patent/ATE349297T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP1417074A1 (en) | 2004-05-12 |
| US6890247B2 (en) | 2005-05-10 |
| CN1462223A (en) | 2003-12-17 |
| ATE349297T1 (en) | 2007-01-15 |
| US20040038622A1 (en) | 2004-02-26 |
| WO2003008150A1 (en) | 2003-01-30 |
| DE10134308A1 (en) | 2003-01-30 |
| DE50209089D1 (en) | 2007-02-08 |
| CN1246123C (en) | 2006-03-22 |
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