EP1182019B1 - Electric power tool with quick clamping device for working tool - Google Patents

Electric power tool with quick clamping device for working tool Download PDF

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Publication number
EP1182019B1
EP1182019B1 EP20010810763 EP01810763A EP1182019B1 EP 1182019 B1 EP1182019 B1 EP 1182019B1 EP 20010810763 EP20010810763 EP 20010810763 EP 01810763 A EP01810763 A EP 01810763A EP 1182019 B1 EP1182019 B1 EP 1182019B1
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EP
European Patent Office
Prior art keywords
clamping
spindle
electric power
power tool
tool
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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EP20010810763
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German (de)
French (fr)
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EP1182019A1 (en
Inventor
Markus Hartmann
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Hilti AG
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Hilti AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories
    • B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
    • B27B5/32—Devices for securing circular saw blades to the saw spindle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/16—Longitudinal screw clamp
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/33—Member applies axial force component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/59—Manually releaseable latch type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18888—Reciprocating to or from oscillating
    • Y10T74/1892—Lever and slide
    • Y10T74/1896—Cam connections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20636—Detents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9377—Mounting of tool about rod-type shaft
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9377—Mounting of tool about rod-type shaft
    • Y10T83/9379—At end of shaft
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9403—Disc type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9461—Resiliently biased connection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9464—For rotary tool

Definitions

  • the invention relates to a power tool according to the preamble of claim 1.
  • Power tools of the type mentioned above have a quick-release device to allow a manual change of a tool.
  • no auxiliary tool is necessary with clamp-type clamping devices in order to relax or tension the clamping device.
  • a known clamping device consist of a threaded rod with a fixedly attached to this clamping flange and a nut.
  • the user is forced to use a fork wrench as an auxiliary tool, for example, to change the tool.
  • the quick-release device can be actuated for example via a clamping lever, for example, to change the tool.
  • Such a power tool is from the DE-C2-4336620 known, with a motor mounted in a housing, which drives a hollow spindle and has a quick-release device for receiving a tool.
  • the quick-clamping device has a clamping spindle which is mounted coaxially displaceably in the hollow spindle and which is secured by an elastic element axially braced.
  • the clamping device can be adjusted between a clamping position and a change position by means of a clamping lever arranged at an end of the clamping spindle facing away from the tool. In the clamping position, the tool is set between the hollow spindle and a clamping flange.
  • an eccentric is arranged, which rests on a bolt on the clamping spindle.
  • An advantage of this known solution is that the tool without auxiliary tools, such as a wrench, can be changed.
  • the user sets the clamping lever in the change position and turns the clamping flange of the clamping spindle and thus can remove the tool, for example, from the clamping device or reposition.
  • the actuating characteristic of the clamping lever affects.
  • the operating force to be applied by the user for the adjusting process is great, since high friction losses occur between the tensioning lever and the clamping spindle.
  • the clamping lever can be in an intermediate position in which the clamping device is neither clamped nor relaxed.
  • a device for rotating disk-shaped tools, such as grinding wheels, circular saw blades or the like.
  • This document discloses a quick-release device for rotating disk-shaped tools, such as grinding wheels, circular saw blades or the like.
  • the tool is clamped between a clamping flange arranged on a rotary spindle and a clamping element, wherein the clamping element is movable in the direction of the axis of rotation of the tool relative to the stationary in this direction clamping flange due to a clamping force.
  • the clamping force is applied by a spring.
  • the present invention has for its object to provide a power tool with a quick-release device that can be braced and relaxed by the user without much operator. Furthermore, the quick release device should clearly be in one of the two states and be economically producible.
  • the clamping lever has a designed as an axle bearing on an annular bearing element formed sliding element
  • the user applied by the operating force is small, since the friction between the clamping spindle and the sliding element is very small.
  • this feature brings a significant reduction in the applied operating force.
  • the sliding element an adjustment possibility to the required clamping force of the elastic element. If a large clamping force is required, for example, it is possible to use costly sliding elements and thus to achieve very good sliding properties.
  • the wear phenomena are lower when using a sliding element, which significantly prolongs the service life even with excessive stress on the power tool.
  • the dimensioning of the contact surface ensures the most compact construction of the quick-release mechanism in the power tool and thus promotes, among other things, its manageability.
  • the deflection is 30 ° to 120 ° to ensure a good control characteristic of the quick release device.
  • the choice of the deflection also determines the stroke between the hollow spindle and clamping spindle. The greater the deflection, the greater the stroke between the clamping position and the change position. However, a large stroke also means a less compact design of the quick release device, since the expansion of the contact surface increases with the deflection. In particular, for example, with hand-held circular saws, a deflection of 80 ° has proven to be optimal.
  • the clamping lever pivots either in the clamping position or in the change position.
  • the exact position of the clamping lever is determined by, for example, a stop surface. If necessary, the end angle ensures pivoting into the change position. The greater the end angle is selected, the more stroke is lost by the backward movement of the clamping spindle against the direction of the tool. On the other hand, the end angle ensures snapping into the change position.
  • the end angle is 10 ° to ensure optimum snap in a compact design yet.
  • the sliding element is advantageously formed by a bearing axis parallel to the axis of rotation bearing element with a radius to ensure an economical and at the same time suitable for high clamping forces solution.
  • Bearing elements are extremely high load and are characterized by low friction and a long service life. In addition, their production is economical, since there is a great need for such elements.
  • the radius corresponds to 0.2 to 0.6 times, in particular 0.4 times, the distance.
  • Fig. 1 and 2 is a power tool according to the invention with a motor mounted in a housing 1, not shown, which drives a hollow spindle 2 and a quick-release device for receiving a tool 3 in cross section.
  • the quick-clamping device has a clamping spindle 4, which is mounted coaxially displaceably in the hollow spindle 2 and which is axially braced by an elastic element 5.
  • the elastic element 5 is mounted with one end in a arranged on the tool side end facing away from the hollow spindle 2 tap hole and is held at the opposite end by a, attached to the clamping spindle 4 flange 13.
  • the sliding element 8 has a radial distance a from a rotation axis 9 of the tensioning lever 6. In this position, the clamping flange 7 can be rotated without the aid of an auxiliary tool to replace, for example, the tool 3 mounted between clamping flange 7 and hollow spindle 2.
  • the tensioning lever 6 is pressed against a stop surface 12 of the housing 1.
  • Fig. 2 represents the tensioning lever 6 in a position in which it is in contact with the clamping spindle 4, but still exerts no force on the elastic element 5.
  • the longitudinal axis of the clamping spindle 4 encloses with the radial distance a between the rotation axis 9 and the sliding member 8 an angle ⁇ , which is about 80 °.
  • a contact surface 11 has an extension K in the pivoting direction which corresponds approximately to the sin ( ⁇ ) -fold of the distance a.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Gripping On Spindles (AREA)
  • Sawing (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Die Erfindung betrifft ein Elektrowerkzeug nach dem Oberbegriff des Anspruchs 1.The invention relates to a power tool according to the preamble of claim 1.

Elektrowerkzeuge der oben genannten Art weisen eine Schnellspanneinrichtung auf, um ein manuelles Wechseln eines Werkzeuges zu ermöglichen. Im Gegensatz zu bekannten Spanneinrichtungen ist bei Schellspanneinrichtungen kein Hilfswerkzeug nötig, um die Spanneinrichtung zu entspannen oder zu spannen. Beispielsweise kann eine derartige bekannte Spanneinrichtung aus einer Gewindestange mit einem fest an dieser befestigten Spannflansch und einer Mutter bestehen. Bei dieser bekannten Lösung ist der Anwender gezwungen, einen Gabelschlüssel als Hilfswerkzeug zu benutzen, um beispielsweise das Werkzeug zu wechseln. Im Gegensatz dazu, kann die Schnellspanneinrichtung beispielsweise über einen Spannhebel betätigt werden, um beispielsweise das Werkzeug zu wechseln.Power tools of the type mentioned above have a quick-release device to allow a manual change of a tool. In contrast to known clamping devices, no auxiliary tool is necessary with clamp-type clamping devices in order to relax or tension the clamping device. For example, such a known clamping device consist of a threaded rod with a fixedly attached to this clamping flange and a nut. In this known solution, the user is forced to use a fork wrench as an auxiliary tool, for example, to change the tool. In contrast, the quick-release device can be actuated for example via a clamping lever, for example, to change the tool.

Ein derartiges Elektrowerkzeug ist aus der DE-C2-4336620 bekannt, mit einem in einem Gehäuse gelagerten Motor, der eine Hohlspindel antreibt und eine Schnellspanneinrichtung zur Aufnahme eines Werkzeuges aufweist. Die Schnellspanneinrichtung weist eine in der Hohlspindel koaxial verschieblich gelagerte Spannspindel auf, die durch ein elastisches Element axial verspannt ist. Mittels eines an einem werkzeugseitig abgewandten Ende der Spannspindel angeordneten Spannhebels, ist die Schnellspanneinrichtung zwischen einer Spannposition und einer Wechselposition stellbar. In der Spannposition ist das Werkzeug zwischen der Hohlspindel und einem Spannflansch festgelegt. An einem Erde mit dem der Spannhebel an einer Drehachse festgelegt ist, ist ein Exzenter angeordnet, der über einen Bolzen an der Spannspindel anliegt. Durch Schwenken des Spannhebels in die Wechselposition wird die Spannspindel durch den Exzenter gegen die Kraft des elastischen Elementes und der zwischen dem Exzenter und dem Bolzen entstehenden Reibung axial in Richtung Werkzeug verschoben. In dieser Position kann der Spannflansch ohne Zuhilfenahme eines Hilfswerkzeuges verdreht werden, um beispielsweise das Werkzeug auszuwechseln.Such a power tool is from the DE-C2-4336620 known, with a motor mounted in a housing, which drives a hollow spindle and has a quick-release device for receiving a tool. The quick-clamping device has a clamping spindle which is mounted coaxially displaceably in the hollow spindle and which is secured by an elastic element axially braced. The clamping device can be adjusted between a clamping position and a change position by means of a clamping lever arranged at an end of the clamping spindle facing away from the tool. In the clamping position, the tool is set between the hollow spindle and a clamping flange. At an earth with which the clamping lever is fixed to a rotation axis, an eccentric is arranged, which rests on a bolt on the clamping spindle. By pivoting the clamping lever in the change position, the clamping spindle is moved by the eccentric against the force of the elastic element and the resulting between the eccentric and the bolt friction axially towards the tool. In this position, the clamping flange can be rotated without the aid of an auxiliary tool, for example, to replace the tool.

Vorteilhaft an dieser bekannten Lösung ist, dass das Werkzeug ohne Hilfswerkzeug, wie beispielsweise einem Gabelschlüssel, gewechselt werden kann. Der Anwender stellt den Spannhebel in die Wechselposition und dreht die Spannflansch von der Spannspindel ab und kann somit das Werkzeug beispielsweise aus der Spannvorrichtung entnehmen oder auch neu positionieren.An advantage of this known solution is that the tool without auxiliary tools, such as a wrench, can be changed. The user sets the clamping lever in the change position and turns the clamping flange of the clamping spindle and thus can remove the tool, for example, from the clamping device or reposition.

Nachteilig an der bekannten Lösung wirkt sich die Stellcharakteristik des Spannhebels aus. Einerseits ist die vom Anwender aufzubringende Bedienkraft für den Stellvorgang gross, da hohe Reibungsverluste zwischen Spannhebel und Spannspindel auftreten. Und andererseits kann sich der Spannhebel in einer Zwischenstellung befinden, in der die Spannvorrichtung weder verspannt noch entspannt ist.A disadvantage of the known solution, the actuating characteristic of the clamping lever affects. On the one hand, the operating force to be applied by the user for the adjusting process is great, since high friction losses occur between the tensioning lever and the clamping spindle. And on the other hand, the clamping lever can be in an intermediate position in which the clamping device is neither clamped nor relaxed.

Aus der DE 35 23 746 A1 ist eine Vorrichtung gemäß dem Oberbegriff des Anspruchs 1 bekannt. Dieser Dokument offenbart eine Schnellspannvorrichtung für rotierende scheibenförmige Werkzeuge, wie Schleifscheiben, Kreissägeblätter oder dgl., bekannt. Bei dieser Schnellspannvorrichtung ist das Werkzeug zwischen einem auf einer Drehspinde angeordneten Spannflansch und einem Spannelement einspannbar, wobei das Spannelement Richtung der Rotationsachse des Werkzeugs relativ zum in dieser Richtung ortsfesten Spannflansch aufgrund einer Spannkraft bewegbar ist. Die Spannkraft wird dabei von einer Feder aufgebracht.From the DE 35 23 746 A1 a device according to the preamble of claim 1 is known. This document discloses a quick-release device for rotating disk-shaped tools, such as grinding wheels, circular saw blades or the like., Known. In this quick-release device, the tool is clamped between a clamping flange arranged on a rotary spindle and a clamping element, wherein the clamping element is movable in the direction of the axis of rotation of the tool relative to the stationary in this direction clamping flange due to a clamping force. The clamping force is applied by a spring.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Elektrowarkzeug mit einer Schnellspanneinrichtung zu schaffen, die ohne grosse Bedienkraft vom Anwender verspannt und entspannt werden kann. Ferner soll sich die Schnellspannvorrichtung eindeutig in einem der beiden Zustände befinden und wirtschaftlich herstellbar sein.The present invention has for its object to provide a power tool with a quick-release device that can be braced and relaxed by the user without much operator. Furthermore, the quick release device should clearly be in one of the two states and be economically producible.

Erfindungsgemäss wird die Aufgabe durch die kennzeichenden Merkmalen des Anspruchs 1 gelöst.According to the invention, the object is achieved by the characterizing features of claim 1.

Dadurch, dass der Spannhebel ein als auf einer Achse angeordnetes ringförmiges Lagerelement ausgebildetes Gleitelement aufweist, ist die vom Anwender aufzubringende Bedienkraft klein, da die Reibung zwischen der Spannspindel und dem Gleitelement sehr klein ist. Insbesondere bei Schnellspannvorrichtungen mit hoher Spannkraft bringt dieses Merkmal eine erhebliche Reduzierung der aufzubringenden Bedienkraft. Ferner besteht durch die Wahl des Gleitelementes eine Anpassungsmöglichkeit an die geforderte Spannkraft des elastischen Elements. Wird eine grosse Spannkraft gefordert, so besteht beispielsweise die Möglichkeit, kostspielige Gleitelemente einzusetzen und somit sehr gute Gleiteigenschaften zu erreichen. Ausserdem sind, im Gegensatz zu bekannten Lösungen mit Schnellspanneinrichtungen, beim Einsatz eines Gleitelementes die Verschleisserscheinungen geringer, was die Standzeit auch bei übermässiger Beanspruchung des Elektrowerkzeuges erheblich verlängert. Die Dimensionierung der Kontaktfläche gewährleistet eine möglichst kompakte Konstruktion des Schnellspannmechanismus im Elektrowerkzeug und fördert damit unter anderem dessen Handlichkeit.Characterized in that the clamping lever has a designed as an axle bearing on an annular bearing element formed sliding element, the user applied by the operating force is small, since the friction between the clamping spindle and the sliding element is very small. Especially with quick-release devices with high clamping force, this feature brings a significant reduction in the applied operating force. Furthermore, by the choice of the sliding element an adjustment possibility to the required clamping force of the elastic element. If a large clamping force is required, for example, it is possible to use costly sliding elements and thus to achieve very good sliding properties. In addition, in contrast to known solutions with quick-release devices, the wear phenomena are lower when using a sliding element, which significantly prolongs the service life even with excessive stress on the power tool. The dimensioning of the contact surface ensures the most compact construction of the quick-release mechanism in the power tool and thus promotes, among other things, its manageability.

In einer bevorzugten Ausführungsform beträgt die Auslenkung 30° bis 120°, um eine gute Stellcharakteristik der Schnellspannvorrichtung zu gewährleisten. Die Wahl der Auslenkung bestimmt ferner den Hubweg zwischen Hohlspindel und Spannspindel. Je grösser die Auslenkung, desto grösser ist der Hubweg zwischen der Spannposition und der Wechselposition. Jedoch bedeutet ein grosser Hubweg auch eine weniger kompakte Ausbildung der Schnellspannvorrichtung, da sich die Ausdehnung der Kontaktfläche mit der Auslenkung vergrössert. Insbesondere hat sich beispielsweise bei handgeführten Kreissägen, eine Auslenkung von 80° als optimal erwiesen.In a preferred embodiment, the deflection is 30 ° to 120 ° to ensure a good control characteristic of the quick release device. The choice of the deflection also determines the stroke between the hollow spindle and clamping spindle. The greater the deflection, the greater the stroke between the clamping position and the change position. However, a large stroke also means a less compact design of the quick release device, since the expansion of the contact surface increases with the deflection. In particular, for example, with hand-held circular saws, a deflection of 80 ° has proven to be optimal.

Vorteilhafterweise beträgt in der Wechselposition der durch den Abstand und die Längsachse eingeschlossene Endwinkel zwischen 5° und 30°. Damit werden undefinierte Zwischenstellungen der Schnellspannvorrichtung ausgeschlossen. Der Spannhebel schwenkt entweder in die Spannposition oder in die Wechselposition. Insbesondere in der Wechselposition, ist durch beispielsweise eine Anschlagfläche die genaue Position des Spannhebels festgelegt. Der Endwinkel stellt gegebenenfalls ein Schwenken in die Wechselposition sicher. Je grösser der Endwinkel gewählt wird, desto mehr Hubweg geht durch die Rückwärtsbewegung der Spannspindel entgegen der Richtung des Werkzeuges verloren. Andererseits stellt der Endwinkel ein Einschnappen in die Wechselposition sicher.Advantageously, in the change position the trapped by the distance and the longitudinal axis end angle between 5 ° and 30 °. This undefined intermediate positions of the quick release device are excluded. The clamping lever pivots either in the clamping position or in the change position. In particular, in the change position, the exact position of the clamping lever is determined by, for example, a stop surface. If necessary, the end angle ensures pivoting into the change position. The greater the end angle is selected, the more stroke is lost by the backward movement of the clamping spindle against the direction of the tool. On the other hand, the end angle ensures snapping into the change position.

Vorzugsweise beträgt der Endwinkel 10°, um ein optimales Einschnappen bei einer dennoch kompakten Bauweise sicherzustellen.Preferably, the end angle is 10 ° to ensure optimum snap in a compact design yet.

Das Gleitelement wird vorteilhafterweise durch ein zur Drehachse achsenparalleles Lagerelement mit einem Radius gebildet, um eine wirtschaftliche und zugleich für hohe Spannkräfte geeignete Lösung zu gewährleisten. Lagerelemente sind überaus hoch belastbar und zeichnen sich durch eine geringe Reibung und eine lange Lebensdauer aus. Ausserdem ist deren Herstellung wirtschaftlich, da ein grosser Bedarf an derartigen Elementen besteht.The sliding element is advantageously formed by a bearing axis parallel to the axis of rotation bearing element with a radius to ensure an economical and at the same time suitable for high clamping forces solution. Bearing elements are extremely high load and are characterized by low friction and a long service life. In addition, their production is economical, since there is a great need for such elements.

Um eine optimale Stellcharakteristik zu erhalten, entspricht der Radius in einer bevorzugten Ausführungsform dem 0,2- bis 0,6-fachen, insbesondere 0,4-fache des Abstandes.In order to obtain an optimum actuating characteristic, in a preferred embodiment the radius corresponds to 0.2 to 0.6 times, in particular 0.4 times, the distance.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles näher erläutert. Es zeigen:

Fig. 1
einen Querschnitt der Schnellspanneinrichtung in einer Wechselposition
Fig. 2
einen Querschnitt der Schnellspanneinrichtung in einer Position, in der eine Spann- spindel in Kontakt mit einem Gleitelement ist.
The invention will be explained in more detail below with reference to an embodiment. Show it:
Fig. 1
a cross section of the quick-release device in a change position
Fig. 2
a cross section of the quick-release device in a position in which a clamping spindle is in contact with a sliding element.

In den Fig. 1 und 2 ist ein erfindungsgemässes Elektrowerkzeug mit einem in einem Gehäuse 1 gelagerten, nicht dargestellten Motor, der eine Hohlspindel 2 antreibt und einer Schnellspanneinrichtung zur Aufnahme eines Werkzeuges 3 im Querschnitt dargestellt. Die Schnellspanneinrichtung weist eine in der Hohlspindel 2 koaxial verschieblich gelagerten Spannspindel 4 auf, die durch ein elastisches Element 5 axial verspannt ist. Das elastische Element 5 ist mit einem Ende in einer an dem werkzeugseitig abgewandten Ende der Hohlspindel 2 angeordneten Stufenlochbohrung gelagert und wird am gegenüberliegenden Ende durch ein, an der Spannspindel 4 befestigten Flansch 13 gehalten. Mittels eines an einem werkzeugseitig abgewandten Ende der Spannspindel 4 angeordneten Spannhebels 6, ist die Schnellspanneinrichtung zwischen einer Spannposition, wie sie insbesondere aus Fig. 1 ersichtlich ist, und einer, insbesondere in Fig. 2 dargestellten Wechselposition stellbar. In der Spannposition ist das Werkzeug 3 zwischen der Hohlspindel 2 und einem Spannflansch 7 festgelegt.In the Fig. 1 and 2 is a power tool according to the invention with a motor mounted in a housing 1, not shown, which drives a hollow spindle 2 and a quick-release device for receiving a tool 3 in cross section. The quick-clamping device has a clamping spindle 4, which is mounted coaxially displaceably in the hollow spindle 2 and which is axially braced by an elastic element 5. The elastic element 5 is mounted with one end in a arranged on the tool side end facing away from the hollow spindle 2 tap hole and is held at the opposite end by a, attached to the clamping spindle 4 flange 13. By means of an arranged on a tool end facing away from the clamping spindle 4 clamping lever 6, the quick-clamping device between a clamping position, as in particular Fig. 1 is apparent, and one, in particular in Fig. 2 adjustable position shown adjustable. In the clamping position, the tool 3 between the hollow spindle 2 and a clamping flange 7 is fixed.

Durch Schwenken des Spannhebels 6 von der, insbesondere in Fig. 1 dargestellten, Spannposition in die Wechselposition, welche insbesondere in Fig. 2 dargestellt ist, wird die Spannspindel 4 durch ein Gleitelement 8, insbesondere durch ein ringförmiges Lagerelement, gegen die Kraft des elastischen Elementes 5 axial in Richtung Werkzeug 3 verschoben. Das Gleitelement 8 weist einen radialen Abstand a von einer Drehachse 9 des Spannhebels 6 auf. In dieser Position kann der Spannflansch 7 ohne Zuhilfenahme eines Hilfswerkzeuges verdreht werden um beispielsweise das zwischen Spannflansch 7 und Hohlspindel 2 gelagerte Werkzeug 3 auszuwechseln. Ein durch den Abstand a und die Längsachse der Spannspindel 4 eingeschlossener Endwinkel β, stellt ein Verharren der Spannspindel 4 in der Wechselposition sicher. Dabei wird der Spannhebel 6 gegen eine Anschlagfläche 12 des Gehäuses 1 gedrückt.By pivoting the clamping lever 6 of the, in particular in Fig. 1 shown, clamping position in the change position, which in particular in Fig. 2 is shown, the clamping spindle 4 is displaced axially by a sliding element 8, in particular by an annular bearing element against the force of the elastic element 5 in the direction of tool 3. The sliding element 8 has a radial distance a from a rotation axis 9 of the tensioning lever 6. In this position, the clamping flange 7 can be rotated without the aid of an auxiliary tool to replace, for example, the tool 3 mounted between clamping flange 7 and hollow spindle 2. A trapped by the distance a and the longitudinal axis of the clamping spindle 4 end angle β, provides a persistence of the clamping spindle 4 in the exchange position safe. In this case, the tensioning lever 6 is pressed against a stop surface 12 of the housing 1.

Fig. 2 stellt den Spannhebel 6 in einer Position dar, in der er in Kontakt mit der Spannspindel 4 steht, jedoch noch keine Kraft auf das elastische Element 5 ausübt. In dieser Position schliesst die Längsachse der Spannspindel 4 mit dem radialen Abstand a zwischen der Drehachse 9 und dem Gleitelement 8 einen Winkel α ein, der etwa 80° beträgt. Eine Kontaktfläche 11 weist in Schwenkrichtung eine Ausdehnung K auf, die etwa dem sin(α)-fachen des Abstandes a entspricht. Fig. 2 represents the tensioning lever 6 in a position in which it is in contact with the clamping spindle 4, but still exerts no force on the elastic element 5. In this position, the longitudinal axis of the clamping spindle 4 encloses with the radial distance a between the rotation axis 9 and the sliding member 8 an angle α, which is about 80 °. A contact surface 11 has an extension K in the pivoting direction which corresponds approximately to the sin (α) -fold of the distance a.

Claims (8)

  1. Electric power tool, in particular a circular saw and the like, with a motor mounted in a housing (1), the motor drives a hollow spindle (2) and a quick-clamping device for receiving a tool (3), the quick-clamping device having a clamping spindle (4) mounted coaxially displaceably in the hollow spindle (2), the clamping spindle (4) can be tensioned axially by an elastic element (5) and is movable - by means of a clamping lever (6) arranged on an end of the clamping spindle (4) oriented away from the tool (3), the clamping lever (6) having at one end a rotational axis (9) - between a clamping position in which the tool (3) is clamped non-rotatably on the hollow spindle (2) and an exchange position, the tool (3) beir g mounted in a tensionable manner between a clamping flange (7) which can be fitted to the tool-holding end of the clamping spindle (4) and the hollow spindle (2), the clamping lever (6) having at a radial distance (a) a slide element (8) which can be brought into contact with the end of the clamping spindle (4) opposite to the tool (3) by swivelling the clamping lever (6) about the rotational axis (9) through a deflection (α) with respect to the longitudinal axis of the clamping spindle (4), and the clamping spindle (4) having a contact surface (11) with an extension (K) in the swivelling d rection which is at least equal to the distance (a) times sin (α), characterised in that the slide element (8) is formed by an annular bearing element arranged on an axis.
  2. Electric power tool according to Claim 1, characterised in that the deflection (α) extends over from 30° to 120°.
  3. Electric power tool according to Claim 2, characterised in that the deflection (α) is 80°.
  4. Electric power tool according to any one of Claims 1 to 3, characterised in that in the exchange position the final angle (β) included by the distance (a) and the longitudinal axis extends over from 5° to 30°.
  5. Electric power tool according to Claim 4, characterised in that the final angle (β) is 10°.
  6. Electric power tool according to any one of Claims 1 to 5, characterised in that the annular bearing element is axially parallel to the rotational axis (9) and has a radius (R).
  7. Electric power tool according to Claim 6, characterised in that the radius (R) is equal to 0.2 to 0.6 times the distance (a).
  8. Electric power tool according to Claim 7, characterised in that the radius (R) is equal to 0.4 times the distance (a).
EP20010810763 2000-08-17 2001-08-07 Electric power tool with quick clamping device for working tool Expired - Lifetime EP1182019B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000140330 DE10040330A1 (en) 2000-08-17 2000-08-17 Power tool with clamping device
DE10040330 2000-08-17

Publications (2)

Publication Number Publication Date
EP1182019A1 EP1182019A1 (en) 2002-02-27
EP1182019B1 true EP1182019B1 (en) 2009-07-15

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EP20010810763 Expired - Lifetime EP1182019B1 (en) 2000-08-17 2001-08-07 Electric power tool with quick clamping device for working tool

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US (1) US6953197B2 (en)
EP (1) EP1182019B1 (en)
JP (1) JP4827336B2 (en)
DE (2) DE10040330A1 (en)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004020982A1 (en) * 2004-04-23 2005-11-17 C. & E. Fein Gmbh Powered hand tool with clamping device for a tool
US8117542B2 (en) * 2004-08-16 2012-02-14 Microsoft Corporation User interface for displaying selectable software functionality controls that are contextually relevant to a selected object
EP2214615A4 (en) 2007-11-13 2012-04-25 Orthopediatrics Corp Cast removal system
DE202009001440U1 (en) * 2009-01-30 2010-07-01 C. & E. Fein Gmbh Powered hand tool with clamping device for a tool
US8454028B1 (en) * 2009-03-25 2013-06-04 Honda Motor Co., Ltd. Fixture for holding a chamfering tool during cutting insert preset operation
US20110039482A1 (en) * 2009-07-29 2011-02-17 Terry Timmons Grinder
ITTO20091046A1 (en) * 2009-12-28 2011-06-29 Cnh Italia Spa LOCK WITH A REMOTE ACTUATOR FOR A VEHICLE PANEL
DE102010064371B4 (en) * 2010-12-30 2021-12-16 Robert Bosch Gmbh Hand tool clamping device with switching element
DE102011003100A1 (en) * 2011-01-25 2012-07-26 Robert Bosch Gmbh Tool clamping device
DE102011003098A1 (en) * 2011-01-25 2012-07-26 Robert Bosch Gmbh Tool clamping device
US9393711B2 (en) 2011-04-11 2016-07-19 Milwaukee Electric Tool Corporation Hand-held knockout punch driver
US9089986B2 (en) 2011-08-22 2015-07-28 Milwaukee Electric Tool Corporation Draw stud connector
JP5746645B2 (en) 2012-02-03 2015-07-08 株式会社マキタ Work tools
US9186788B2 (en) 2012-11-15 2015-11-17 Techtronic Power Tools Technology Limited Lockout mechanism
US9339927B2 (en) * 2012-12-29 2016-05-17 Chervon (Hk) Limited Accessory clamping mechanism and power tool having the same
JP2014131824A (en) * 2013-01-07 2014-07-17 Makita Corp Work tool
WO2017036403A1 (en) * 2015-08-31 2017-03-09 苏州宝时得电动工具有限公司 Hand-held tool and clamping device thereof
US20170259348A1 (en) * 2016-03-09 2017-09-14 Ac (Macao Commercial Offshore) Limited Toolless blade release mechanism for a power tool
DE102016220362A1 (en) * 2016-10-18 2018-04-19 Robert Bosch Gmbh Quick-clamping device for a portable power tool having at least one output shaft which can be driven in rotation, in particular an angle grinder
CN109986513A (en) * 2017-12-29 2019-07-09 宝时得科技（中国）有限公司 Power tool
JP7096032B2 (en) 2018-03-28 2022-07-05 株式会社マキタ Multi tool
US11052475B2 (en) * 2018-11-27 2021-07-06 Zhejiang Burley Tools Co., Ltd. Rapid replacing structure for multi-purpose saw
WO2020123737A1 (en) * 2018-12-14 2020-06-18 Fisher Controls International Llc Stabilized cutting tool assemblies
US11660690B2 (en) 2019-11-28 2023-05-30 Makita Corporation Power tool
US11590593B2 (en) 2019-11-28 2023-02-28 Makita Corporation Power tool
JP7422538B2 (en) 2019-12-26 2024-01-26 株式会社マキタ Work tools
JP7330914B2 (en) 2020-02-13 2023-08-22 株式会社マキタ vibration tool
US11667051B2 (en) * 2020-09-23 2023-06-06 Wilson Tool International Inc. Punch assemblies and toolless systems thereof for tip retention and release

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0152564B1 (en) * 1984-02-18 1989-08-23 C. & E. FEIN GmbH & Co. Tool mounting
DE3523746A1 (en) 1985-07-03 1987-01-08 Metabowerke Kg Quick-action clamping device for rotating disc-shaped tools
DE3623555A1 (en) * 1986-07-12 1988-02-04 Fein C & E FASTENING DEVICE FOR DISC-SHAPED TOOLS ON THE TOOL SPINDLE OF A PORTABLE ELECTRIC TOOL MACHINE
DE3741484C1 (en) * 1987-12-08 1989-08-24 Fein C & E Hand machine tool with automatic locking of the work spindle
DE3902874A1 (en) * 1989-02-01 1990-08-09 Fein C & E ADAPTER FOR ATTACHING AN ADDITIONAL TOOL
DE59101383D1 (en) * 1991-01-16 1994-05-19 Fein C & E Portable grinder with quick clamping device.
US5303688A (en) * 1992-04-03 1994-04-19 Chiuminatta Edward R Mounting arbor for saw cutting blades
DE4336620C2 (en) 1993-10-27 1997-07-03 Fein C & E Power tool with a clamping device that can only be operated when the engine is switched off
JP3343506B2 (en) * 1998-04-16 2002-11-11 株式会社貝印刃物開発センター Protective member locking device for circular blade type cutter

Also Published As

Publication number Publication date
DE50114985D1 (en) 2009-08-27
US6953197B2 (en) 2005-10-11
US20020035882A1 (en) 2002-03-28
JP4827336B2 (en) 2011-11-30
JP2002126944A (en) 2002-05-08
EP1182019A1 (en) 2002-02-27
DE10040330A1 (en) 2002-02-28

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