EP4227040A1 - Clamping device and hand-held power tool - Google Patents
Clamping device and hand-held power tool Download PDFInfo
- Publication number
- EP4227040A1 EP4227040A1 EP23173701.6A EP23173701A EP4227040A1 EP 4227040 A1 EP4227040 A1 EP 4227040A1 EP 23173701 A EP23173701 A EP 23173701A EP 4227040 A1 EP4227040 A1 EP 4227040A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- clamping device
- coupling module
- clamping
- screw
- drive spindle
- 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.)
- Pending
Links
- 230000008878 coupling Effects 0.000 claims abstract description 55
- 238000010168 coupling process Methods 0.000 claims abstract description 55
- 238000005859 coupling reaction Methods 0.000 claims abstract description 55
- 229920001971 elastomer Polymers 0.000 claims description 11
- 239000000806 elastomer Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
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
- 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
- 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
- B24B23/028—Angle tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
-
- 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
Definitions
- the present invention relates to a clamping device for the axial clamping of a tool disk on a flange assigned to a drive spindle of a hand-held power tool.
- the clamping device has a screw which, in order to clamp the tool disk, is to be screwed into an internal thread of the drive spindle.
- clamping devices are basically known from the prior art. Also known from the prior art are clamping devices with a clamping nut, in particular designed as a two-hole nut, which is to be fastened to the drive spindle with a corresponding tool. However, the present invention relates to a different class of clamping devices, namely those that have a screw that is to be screwed into an end internal thread of the drive spindle.
- the object is achieved in that the screw is mounted in a coupling module of the clamping device, the coupling module having an inner contour which is paired or can be paired with the drive spindle in a form-fitting, non-rotatable manner in the circumferential direction.
- the clamping device has the advantage that it can neither be tightened nor loosened during operation of the hand-held power tool because the coupling module, as part of the clamping device, is paired with the drive spindle in a form-fitting, non-rotatable manner.
- the inner contour of the coupling module is designed as a hexagonal profile.
- a corresponding outer contour of the drive spindle is preferably designed as an external hexagon.
- Alternative form-locking non-rotating pairings for example in the sense of a form-locking shaft-hub connection, can be used.
- the internal thread of the drive spindle is preferably an end internal thread.
- the internal thread can be positioned in the axial direction opposite a top surface of the drive spindle be reset.
- the screw preferably protrudes in the axial direction beyond the coupling module, in particular opposite the cylindrical section of the coupling module.
- the coupling module is preferably of cylindrical design.
- the coupling module has a cylindrical section that can protrude through a central opening of the tool disk.
- the cylindrical section of the coupling module can protrude into a central opening of the flange.
- the tensioning device has a hand knob which is formed in a form-fitting, non-rotatable manner with the screw in the circumferential direction.
- the clamping device can be handled particularly easily. There is no need for an additional assembly tool, such as an assembly wrench.
- the clamping device has a clamping element, which can be subjected to an axial clamping force by means of the coupling module, in order to clamp the tool disk against the flange in this way.
- the clamping element is particularly preferably designed as a spring steel sheet.
- the spring plate can be disc-shaped.
- the screw is mounted in the coupling module via a roller bearing. Because head friction of the clamping element can be reduced with the aid of the roller bearing, an increased clamping force of the clamping device is achieved.
- the roller bearing is particularly preferably designed as an angular ball bearing.
- the angular contact ball bearing preferably has a contact angle between 35° and 45°.
- the contact angle can be 40°. Due to the diagonal contact angle of the rolling elements, especially in an angular contact ball bearing, the clamping device wedges radially towards the end of the clamping process. This provides increased security against accidental loosening.
- the clamping device has a clamping element in the form of a spring plate, which is preferred, the clamping device has increased insensitivity to settlement, since the spring plate is in frictional contact with the tool disk, which compensates for thermal expansion.
- the tensioning device has an elastomer ring, which is preferably arranged between a head of the screw and a collar of the coupling module.
- the clamping device can have a retaining ring, by means of which the coupling module is held on the screw.
- a plate spring can also be provided instead of an elastomer ring.
- the disc spring can serve to to seal a grease space between the screw head and the collar of the coupling mode.
- the disk spring can also prestress the hand knob axially.
- the tensioning device has a stop, via which a deflection of the tensioning member is directly or indirectly limited.
- the stop is preferably designed as an annular collar and is arranged between the spring plate and the tool disk to be accommodated. If the tool disk comes into contact with the stop during the clamping process, a deflection of the spring element in the axial direction is limited.
- a hand-held power tool preferably in the form of a grinder or cut-off grinder, with a drive spindle, which preferably has an internal thread at the end, and with a clamping device of the type described above Inner contour of the coupling module is paired or pairable.
- the hand-held power tool comprises a flange which is or can be connected to the drive spindle in a form-fitting, non-rotatable manner by means of an anti-rotation device in the circumferential direction.
- the handheld power tool according to the invention can be advantageously further developed in a corresponding manner by the features explained with reference to the clamping device.
- a preferred embodiment of a clamping device 10 according to the invention is shown in 1 shown.
- the clamping device 10 serves to clamp a tool disk 300 in the axial direction AR.
- the tool disk 300 is to be braced between the clamping device 10 and a flange 30 , the flange 30 being associated with a drive spindle 20 of a hand-held power tool 100 .
- the flange 30 has an anti-twist device 24 in the form of a lateral recess, so that the flange placed on the drive spindle 20 is positively connected to the drive spindle 20 in the circumferential direction U so that it cannot be twisted.
- the clamping device 10 has a screw 2 which is to be screwed into an end internal thread 22 of the drive spindle 20 in order to clamp the tool disk 300 .
- a coupling module 1 of the clamping device 10 provided according to the invention can already be seen to some extent, in which the screw 2 is centrally mounted.
- the inner contour of the invention is later with reference to 2 explained in more detail.
- the clamping device 10 has a hand knob 3 .
- This is used for manually screwing the screw 2 into the internal thread 22 and thus for axially clamping the tool disk 300 between the clamping device 10 and the flange 30.
- a head of the screw 12 has an outer hexagonal contour, for example, which is embedded in a corresponding inner hexagonal contour of the hand knob 3 .
- almost any other suitable contour can also be used as an alternative to the hexagonal contour.
- the drive spindle 20 has an outer contour, which is present, for example, designed as a hexagonal profile.
- An inner contour of the coupling module 1, not shown here, can be paired with a form fit to this outer contour 26.
- a form-fitting non-rotating pairing between the coupling module 1 and the outer contour 26 is achieved when the clamping device 10 is clamped, with the coupling module 1 at least partially passing through a central opening 301 of the tool disk 300 protrudes.
- FIG. 2 now shows the clamping device 10 of 1 in top view ( Figure 2A ) as well as in bottom view ( Figure 2B ).
- the Tensioning device 10 also has a tensioning element, which is designed here, for example, in the form of a plate-shaped spring plate 4 .
- the actual clamping force is applied to the tool disk 300 by means of the spring plate 4 .
- FIG 2B the central screw 2 of the clamping device 10 is clearly visible.
- the screw is mounted in the coupling module 1 of the clamping device 10, more precisely, the screw 2 is mounted coaxially in the coupling module 1.
- a cylindrical section 13 of the coupling module 1 is clearly visible, with the cylindrical section 13 protruding at least in sections through the central opening 301 of the tool disk 300 when the tool disk 300 is clamped (cf. 1 ) runs.
- the coupling module 1 has an inner contour 16 which, in the circumferential direction UR, is positively secured against rotation with the drive spindle 20 (cf. 1 ) can be paired.
- the inner contour 16 is designed as a hexagonal profile.
- FIG. 3 now shows the preferred embodiment of the clamping device 10 of the previous figures in an exploded view.
- the screw 2 can be seen with its screw head 12 which, for example, has an external hexagonal contour.
- a thread 14 of the screw 2 can be seen in the lower area, which turns into an internal thread (cf. 1 : internal thread 22) is to be screwed in.
- the screw 2 is mounted in the coupling module 1 via a roller bearing, preferably an angular contact ball bearing 5 .
- An elastomer ring 6 shown below the hand knob 3 serves, among other things, to hold the outer contour of the screw head 12 within a corresponding inner contour of the hand knob 3. This is evident in particular from FIG 4 apparent.
- the coupling module 1 can be seen below the elastomer ring 6 , which in addition to the already described cylindrical section 13 and the hexagonal inner contour 16 also has a collar 11 .
- the collar 11 is designed and provided to transmit a clamping force applied via the hand knob 3 and the screw 2 to the spring plate 4 .
- the coupling module 1 can be paired with the spring plate 4 in a form-fitting, non-rotatable manner, in the assembled state.
- the coupling module 1 has a module contour 19 below the collar 11 of the coupling module 1 , which corresponds to an inner contour of the spring plate 4 .
- the module contour 19 is designed as an external square.
- a retaining ring 7 by means of which the coupling module 1 is held on the screw 2 can be seen below the coupling module 1 .
- the clamping element here in the form of the spring plate 4, is held on the coupling module 1 by means of a retaining ring 8.
- the function of the clamping device 10 according to the invention is now with reference to 4 be explained in more detail.
- the flange 30 (cf. 1 ) is plugged onto the drive spindle 20 of the hand-held power tool 100 .
- the anti-twist device 24 connects the flange 30 in the circumferential direction U in a form-fitting, non-twistable manner to the drive spindle 20 .
- the cutting wheel 300 is inserted.
- the inner contour 16 here a hexagon socket
- the inner contour 16 first comes into positive, non-rotatable engagement with the outer contour 26 of the drive spindle 20 . This is preferably done before the thread 14 of the screw 2 enters the internal thread 22 of the drive spindle 20 .
- roller bearing that is preferably provided is designed as an angular contact ball bearing 5, which, for example, has a contact angle BW of 40° (cf. also figure 5 ) having. This increases head friction on the screw head 2, which prevents the clamping device 10 from being released unintentionally.
- a locking ring 8 shown below the spring plate 4 serves to hold the clamping plate 4 on the coupling module 1.
- the clamping force is transmitted in the axial direction AR via a collar 11 of the coupling module 1 to the spring plate 4 and from there to the tool disk 300 .
- the spring plate 4 and the coupling module 1 are coupled to one another in a form-fitting, non-rotatable manner.
- FIG. 1 shows another preferred exemplary embodiment of a clamping device 10 according to the invention.
- a roller bearing in the form of an angular contact ball bearing 5 is provided between coupling module 1 and screw 2, which has a contact angle BW of 40° (example).
- BW contact angle
- the embodiment of figure 5 a stop 9, via which a deflection of the clamping member, which is designed here as a spring plate 4, can be limited.
- FIG 5a Another preferred embodiment of a clamping device 10 according to the invention is shown.
- a roller bearing in the form of an angular contact ball bearing 5 is provided between the coupling module 1 and the screw 2, which has a contact angle BW of 40° (example).
- a disk spring 6a is provided instead of the elastomer ring 6 for sealing and preloading of the hand knob 3, a disk spring 6a.
- the disc spring 6a is positioned between an underside of the hand knob 3 and an upper side of the collar of the coupling module 11, so that the spring force of the disc spring 6a acts on the underside of the hand knob 3 and the upper side of the collar of the coupling module 11.
- the plate spring 6a positioned in this way serves, among other things, to hold the outer contour of the screw head 12 within a corresponding inner contour of the hand knob 3.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Clamps And Clips (AREA)
- Portable Power Tools In General (AREA)
Abstract
Spannvorrichtung (10) zum axialen (AR) Verspannen einer Werkzeugscheibe (300) an einem einer Antriebsspindel (20) einer Handwerkzeugmaschine (100) zugeordneten Flansch (30), wobei die Spannvorrichtung (100) eine Schraube (2) aufweist, die, zum Festspannen der Werkzeugscheibe (300), in ein Innengewinde (22) der Antriebsspindel (20) einzuschrauben ist, wobei die Schraube (2) in einem Koppelmodul (1) der Spannvorrichtung (10) gelagert ist, wobei das Koppelmodul (1) eine Innenkontur (16) aufweist, die in Umfangsrichtung (U) formschlüssig verdrehsicher mit der Antriebsspindel (20) gepaart oder paarbar ist.Clamping device (10) for the axial (AR) clamping of a tool disk (300) on a flange (30) assigned to a drive spindle (20) of a hand-held power tool (100), the clamping device (100) having a screw (2) which, for clamping of the tool disk (300) is to be screwed into an internal thread (22) of the drive spindle (20), the screw (2) being mounted in a coupling module (1) of the clamping device (10), the coupling module (1) having an inner contour (16 ) which is paired or can be paired with the drive spindle (20) in a form-fitting, non-rotatable manner in the circumferential direction (U).
Description
Die vorliegende Erfindung betrifft eine Spannvorrichtung zum axialen Verspannen einer Werkzeugscheibe an einem eine Antriebsspindel einer Handwerkzeugmaschine zugeordneten Flansch. Die Spannvorrichtung weist eine Schraube auf, die, zum Festspannen der Werkzeugscheibe, in ein Innengewinde der Antriebsspindel einzuschrauben ist.The present invention relates to a clamping device for the axial clamping of a tool disk on a flange assigned to a drive spindle of a hand-held power tool. The clamping device has a screw which, in order to clamp the tool disk, is to be screwed into an internal thread of the drive spindle.
Solche Spannvorrichtungen sind grundsätzlich aus dem Stand der Technik bekannt. Ebenfalls aus dem Stand der Technik bekannt sind Spannvorrichtungen mit einer Spannmutter, insbesondere ausgebildet als Zweilochmutter, die mit einem entsprechenden Werkzeug auf der Antriebsspindel zu befestigen sind. Die vorliegende Erfindung betrifft allerdings eine andere Klasse von Spannvorrichtungen, nämlich solche, die eine Schraube aufweisen, die in ein endseitiges Innengewinde der Antriebsspindel einzuschrauben ist.Such clamping devices are basically known from the prior art. Also known from the prior art are clamping devices with a clamping nut, in particular designed as a two-hole nut, which is to be fastened to the drive spindle with a corresponding tool. However, the present invention relates to a different class of clamping devices, namely those that have a screw that is to be screwed into an end internal thread of the drive spindle.
Es ist Aufgabe der vorliegenden Erfindung, eine Spannvorrichtung zu schaffen, die ein Selbstlösen der Spannvorrichtung - und somit einem Lockern der Werkzeugscheibe im Betrieb der Handwerkzeugmaschine - entgegenwirkt.It is the object of the present invention to provide a clamping device which counteracts the clamping device releasing itself—and thus counteracting the tool disk becoming loose during operation of the hand-held power tool.
Die Aufgabe wird dadurch gelöst, dass die Schraube in einem Koppelmodul der Spannvorrichtung gelagert ist, wobei das Koppelmodul eine Innenkontur aufweist, die in Umfangsrichtung formschlüssig verdrehsicher mit der Antriebsspindel gepaart oder paarbar ist.The object is achieved in that the screw is mounted in a coupling module of the clamping device, the coupling module having an inner contour which is paired or can be paired with the drive spindle in a form-fitting, non-rotatable manner in the circumferential direction.
Die erfindungsgemäße Spannvorrichtung hat den Vorteil, dass sie sich im Betrieb der Handwerkzeugmaschine weder festziehen noch lösen kann, weil das Koppelmodul als Teil der Spannvorrichtung formschlüssig verdrehsicher mit der Antriebsspindel gepaart ist. Dies als Gegenstück zu einem vorzugsweise formschlüssig verdrehsicher mit der Antriebsspindel gepaarten Flansch.The clamping device according to the invention has the advantage that it can neither be tightened nor loosened during operation of the hand-held power tool because the coupling module, as part of the clamping device, is paired with the drive spindle in a form-fitting, non-rotatable manner. This as a counterpart to a flange that is preferably paired with the drive spindle in a form-fitting, non-rotatable manner.
Es hat sich als vorteilhaft herausgestellt, wenn die Innenkontur des Koppelmoduls als Sechskantprofil ausgebildet ist. Vorzugsweise ist eine korrespondierende Außenkontur der Antriebsspindel als Außensechskant ausgebildet. Alternative formschlüssig verdrehsichere Paarungen, beispielsweise im Sinne einer formschlüssigen Welle-Nabe-Verbindungen, können zum Einsatz kommen.It has proven to be advantageous if the inner contour of the coupling module is designed as a hexagonal profile. A corresponding outer contour of the drive spindle is preferably designed as an external hexagon. Alternative form-locking non-rotating pairings, for example in the sense of a form-locking shaft-hub connection, can be used.
Vorzugsweise ist das Innengewinde der Antriebsspindel ein endseitiges Innengewinde. Das Innengewinde kann in axialer Richtung gegenüber einer Kopffläche der Antriebsspindel zurückgesetzt sein. Vorzugsweise steht die Schraube in axialer Richtung über das Koppelmodul, insbesondere gegenüber dem zylinderförmigen Teilabschnitt des Koppelmoduls hinaus. Das Koppelmodul ist vorzugsweise zylindrisch ausgebildet. Vorzugsweise weist das Koppelmodul einen zylindrischen Teilabschnitt auf, der durch eine zentrale Öffnung der Werkzeugscheibe hindurchragen kann. Der zylindrische Teilabschnitt des Koppelmoduls kann in eine zentrale Öffnung des Flansches hineinragen.The internal thread of the drive spindle is preferably an end internal thread. The internal thread can be positioned in the axial direction opposite a top surface of the drive spindle be reset. The screw preferably protrudes in the axial direction beyond the coupling module, in particular opposite the cylindrical section of the coupling module. The coupling module is preferably of cylindrical design. Preferably, the coupling module has a cylindrical section that can protrude through a central opening of the tool disk. The cylindrical section of the coupling module can protrude into a central opening of the flange.
In einer bevorzugten Ausgestaltung weist die Spannvorrichtung einen Handknauf auf, der in Umfangsrichtung formschlüssig verdrehsicher mit der Schraube ausgebildet ist. Dadurch ist eine besonders einfache Handhabung der Spannvorrichtung möglich. Auf ein zusätzliches Montagewerkzeug, wie beispielsweise einen Montageschlüssel, kann verzichtet werden.In a preferred embodiment, the tensioning device has a hand knob which is formed in a form-fitting, non-rotatable manner with the screw in the circumferential direction. As a result, the clamping device can be handled particularly easily. There is no need for an additional assembly tool, such as an assembly wrench.
In einer besonders bevorzugten Ausgestaltung weist die Spannvorrichtung ein Spannglied auf, das mittels des Koppelmoduls mit einer axialen Spannkraft beaufschlagt werden kann, um derart die Werkzeugscheibe gegen den Flansch zu verspannen. Besonders bevorzugt ist das Spannglied als Federblech ausgebildet. Das Federblech kann scheibenförmig ausgebildet sein.In a particularly preferred embodiment, the clamping device has a clamping element, which can be subjected to an axial clamping force by means of the coupling module, in order to clamp the tool disk against the flange in this way. The clamping element is particularly preferably designed as a spring steel sheet. The spring plate can be disc-shaped.
In einer bevorzugten Ausgestaltung ist die Schraube über ein Wälzlager in dem Koppelmodul gelagert. Dadurch, dass eine Kopfreibung des Spannelements mithilfe des Wälzlagers reduziert werden kann, wird eine erhöhte Klemmkraft der Spannvorrichtung realisiert.In a preferred embodiment, the screw is mounted in the coupling module via a roller bearing. Because head friction of the clamping element can be reduced with the aid of the roller bearing, an increased clamping force of the clamping device is achieved.
Besonders bevorzugt ist das Wälzlager als Schrägkugellager ausgebildet. Das Schrägkugellager weist vorzugsweise einen Berührungswinkel zwischen 35° und 45° auf. Der Berührungswinkel kann 40° betragen. Durch den diagonalen Druckwinkel der Wälzkörper, insbesondere in einem Schrägkugellager, verkeilt sich die Spannvorrichtung gegen Ende des Spannvorgangs radial. Dies bietet eine erhöhte Sicherung gegen unbeabsichtigtes Lösen.The roller bearing is particularly preferably designed as an angular ball bearing. The angular contact ball bearing preferably has a contact angle between 35° and 45°. The contact angle can be 40°. Due to the diagonal contact angle of the rolling elements, especially in an angular contact ball bearing, the clamping device wedges radially towards the end of the clamping process. This provides increased security against accidental loosening.
Sofern die Spannvorrichtung über ein Spannglied in Form eines Federblechs verfügt, was bevorzugt ist, erhält die Spannvorrichtung eine erhöhte Unempfindlichkeit gegen Setzung, da sich das Federblech im Kraftschluss zur Werkzeugscheibe befindet, was thermische Dehnungen ausgleicht.If the clamping device has a clamping element in the form of a spring plate, which is preferred, the clamping device has increased insensitivity to settlement, since the spring plate is in frictional contact with the tool disk, which compensates for thermal expansion.
In einer weiteren Ausgestaltung weist die Spannvorrichtung einen Elastomerring auf, der vorzugsweise zwischen einem Kopf der Schraube und einem Kragen des Koppelmoduls angeordnet ist. Alternativ oder zusätzlich kann die Spannvorrichtung einen Haltering aufweisen, mittels dem das Koppelmodul an der Schraube gehalten wird.In a further embodiment, the tensioning device has an elastomer ring, which is preferably arranged between a head of the screw and a collar of the coupling module. Alternatively or additionally, the clamping device can have a retaining ring, by means of which the coupling module is held on the screw.
Gemäß einer vorteilhaften Ausführungsform der vorliegenden Erfindung kann anstelle eines Elastomerrings auch eine Tellerfeder vorgesehen sein. Die Tellerfeder kann dabei dazu dienen, einen Fettraum zwischen dem Schraubenkopf und dem Kragen des Koppelmodus abzudichten. Darüber hinaus kann die Tellerfeder auch den Handknauf axial vorspannen.According to an advantageous embodiment of the present invention, a plate spring can also be provided instead of an elastomer ring. The disc spring can serve to to seal a grease space between the screw head and the collar of the coupling mode. In addition, the disk spring can also prestress the hand knob axially.
Es ist entsprechend einer weiteren vorteilhaften Ausführungsform weiterhin möglich, dass anstelle des Elastomerrings eine Kombination aus Elastomerelement und mechanischer Feder verwendet wird.According to a further advantageous embodiment, it is also possible for a combination of an elastomer element and a mechanical spring to be used instead of the elastomer ring.
Es hat sich als vorteilhaft herausgestellt, wenn das Spannglied mittels eines Sicherungsrings am Koppelmodul gehalten wird.It has proven to be advantageous if the tensioning element is held on the coupling module by means of a retaining ring.
In einer weiteren bevorzugten Ausgestaltung weist die Spannvorrichtung einen Anschlag auf, über den eine Auslenkung des Spannglieds mittelbar oder unmittelbar begrenzt ist. Vorzugsweise ist der Anschlag als ringförmiger Kragen ausgebildet und zwischen Federblech und aufzunehmender Werkzeugscheibe angeordnet. Kommt die Werkzeugscheibe im Zuge des Spannvorgangs mit dem Anschlag in Berührung, so wird eine Auslenkung des Federelements in axialer Richtung begrenzt.In a further preferred embodiment, the tensioning device has a stop, via which a deflection of the tensioning member is directly or indirectly limited. The stop is preferably designed as an annular collar and is arranged between the spring plate and the tool disk to be accommodated. If the tool disk comes into contact with the stop during the clamping process, a deflection of the spring element in the axial direction is limited.
Die Aufgabe wird ebenfalls gelöst durch eine Handwerkzeugmaschine, vorzugsweise in Form eines Schleifers oder Trennschleifers, mit einer Antriebsspindel, die ein vorzugsweise endseitiges Innengewinde aufweist, und mit einer Spannvorrichtung der vorbeschriebenen Art. Die Antriebsspindel weist eine Außenkontur auf, die in Umfangsrichtung formschlüssig verdrehsicher mit der Innenkontur des Koppelmoduls gepaart oder paarbar ist.The object is also achieved by a hand-held power tool, preferably in the form of a grinder or cut-off grinder, with a drive spindle, which preferably has an internal thread at the end, and with a clamping device of the type described above Inner contour of the coupling module is paired or pairable.
Es hat sich als vorteilhaft herausgestellt, wenn die Handwerkzeugmaschine einen Flansch umfasst, der mittels einer Verdrehsicherung in Umfangsrichtung formschlüssig verdrehsicher mit der Antriebsspindel verbunden oder verbindbar ist.It has proven to be advantageous if the hand-held power tool comprises a flange which is or can be connected to the drive spindle in a form-fitting, non-rotatable manner by means of an anti-rotation device in the circumferential direction.
Die erfindungsgemäße Handwerkzeugmaschine kann durch die mit Bezug auf die Spannvorrichtung erläuterten Merkmale in entsprechender Weise vorteilhaft weitergebildet sein.The handheld power tool according to the invention can be advantageously further developed in a corresponding manner by the features explained with reference to the clamping device.
Weitere Vorteile ergeben sich aus der folgenden Figurenbeschreibung. In den Figuren sind verschiedene Ausführungsbeispiele der vorliegenden Erfindung dargestellt. Die Figuren, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages result from the following description of the figures. Various exemplary embodiments of the present invention are shown in the figures. The figures, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into further meaningful combinations.
In den Figuren sind gleiche und gleichartige Komponenten mit gleichen Bezugszeichen beziffert. Es zeigen:
- Fig. 1
- ein bevorzugtes Ausführungsbeispiel einer erfindungsgemäßen Spannvorrichtung zusammen mit einer Werkzeugscheibe und einer Handwerkzeugmaschine;
- Fig. 2
- die Spannvorrichtung der
Fig. 1 in Vorder- und Rückansicht; - Fig. 3
- die Spannvorrichtung der
Figuren 1 und2 in Explosionsdarstellung; - Fig. 4
- die Spannvorrichtung der vorgehenden Figuren in Schnittdarstellung;
- Fig. 5
- ein zweites Ausführungsbeispiel einer erfindungsgemäßen Spannvorrichtung im Teilschnitt; und
- Fig. 5a
- ein drittes Ausführungsbeispiel einer erfindungsgemäßen Spannvorrichtung im Teilschnitt.
- 1
- a preferred embodiment of a clamping device according to the invention together with a tool disc and a hand tool;
- 2
- the clamping device
1 in front and rear view; - 3
- the clamping device
figures 1 and2 in exploded view; - 4
- the clamping device of the preceding figures in a sectional view;
- figure 5
- a second embodiment of a clamping device according to the invention in partial section; and
- Figure 5a
- a third embodiment of a clamping device according to the invention in partial section.
Ein bevorzugtes Ausführungsbeispiel einer erfindungsgemäßen Spannvorrichtung 10 ist in
Der Flansch 30 weist eine Verdrehsicherung 24 in Form einer seitlichen Ausnehmung auf, sodass der auf die Antriebsspindel 20 gesetzte Flansch in Umfangsrichtung U formschlüssig verdrehsicher mit der Antriebsspindel 20 verbunden ist.The
Wie der
Wie der
Wie der
Gut zu erkennen in
In
Erfindungsgemäß weist das Koppelmodul 1 eine Innenkontur 16 auf, die in Umfangsrichtung UR formschlüssig verdrehsicher mit der Antriebsspindel 20 (vgl.
Ein unterhalb des Handknaufs 3 gezeigter Elastomerring 6 dient unter anderem dem Halten der Außenkontur des Schraubenkopfs 12 innerhalb einer korrespondierenden Innenkontur des Handknaufs 3. Dies wird insbesondere aus der
Das Koppelmodul 1 ist in Umfangsrichtung U formschlüssig verdrehsicher mit dem Federblech 4 paarbar, in montiertem Zustand gepaart. Dies gilt vorzugsweise für alle Ausführungsbeispiele. Dazu weist das Koppelmodul 1 unterhalb des Kragens 11 des Koppelmoduls 1 eine Modulkontur 19 auf, die mit einer inneren Kontur des Federblechs 4 korrespondiert. Beispielhaft ist die Modulkontur 19 als Außenvierkant ausgebildet. Unterhalb des Koppelmoduls 1 zu erkennen ist ein Haltering 7, mittels dem das Koppelmodul 1 an der Schraube 2 gehalten wird.In the circumferential direction U, the coupling module 1 can be paired with the
Das Spannglied, hier in Form des Federblechs 4, wird mittels eines Sicherungsrings 8 am Koppelmodul 1 gehalten. Die Funktion der erfindungsgemäßen Spannvorrichtung 10 soll nunmehr mit Bezug auf
Zunächst wird gegebenenfalls der Flansch 30 (vgl.
Beim Eindrehen der Spannvorrichtung 10 wird eine Handkraft über ein Bedienelement, das beispielhaft als Handknauf 3 ausgebildet ist, auf die Schraube 2 übertragen. Dies dadurch, dass der Kopf 12 der Schraube 2 in Umfangsrichtung formschlüssig verdrehsicher in den Handknauf 3 eingebettet ist. Spätestens, wenn das Federblech 4 auf der Werkzeugscheibe 300 aufliegt, gleitet der Kopf 12 der Schraube 2 über das Schrägkugellager 5 relativ zum Koppelmodul 1, bis am Ende des Federwegs des Federblechs 4 eine radiale Verspannung vorherrscht. Es wirkt hierdurch sowohl eine axiale als auch radiale Verspannung zwischen dem Kopf 12 der Schraube 2 zum Koppelmodul 1, wobei insbesondere die radiale Verspannung die höhere Haltewirkung erzeugt. Die radiale Verspannung wird dadurch erreicht, dass das vorzugsweise vorgesehene Wälzlager als Schrägkugellager 5 ausgebildet ist, welches beispielhaft einen Berührungswinkel BW von 40° (vgl. auch
Der zwischen dem Koppelmodul 1 und dem Kopf 12 der Schraube 2 befindliche Elastomerring 6 drückt zum einen einen Abschnitt des Knaufs 3 gegen den Schraubenkopf 12. Und dient somit der Vermeidung eines Schmiermittelaustritts aus dem Wälzkörperraum. Andererseits hält der Elastomerring 6 im Zusammenspiel mit dem Haltering 7 das Koppelmodul 1 an der Schraube 2. Ein unterhalb des Federblechs 4 dargestellter Sicherungsring 8 dient dem Halten des Spannblechs 4 am Koppelmodul 1.The
Wie der
In
- 11
- Koppelmodulcoupling module
- 22
- Schraubescrew
- 33
- Handknaufhand knob
- 44
- Federblechspring plate
- 55
- SchrägkugellagerAngular ball bearing
- 66
- Elastomerringelastomer ring
- 6a6a
- Tellerfederdisc spring
- 77
- Halteringretaining ring
- 88th
- Sicherungsringlocking ring
- 99
- Anschlagattack
- 1010
- Spannvorrichtungclamping device
- 1111
- Kragen des Koppelmodulscollar of the coupling module
- 1212
- Kopf der Schraubehead of the screw
- 1313
- zylindrischer Teilabschnittcylindrical section
- 1414
- Gewindethread
- 1616
- Innenkonturinner contour
- 1919
- Modulkonturmodule contour
- 2020
- Antriebsspindeldrive spindle
- 2222
- Innengewindeinner thread
- 2424
- Verdrehsicherunganti-rotation device
- 2626
- Aussenkonturouter contour
- 3030
- Flanschflange
- 100100
- Handwerkzeugmaschinehand tool
- 300300
- Werkzeugscheibetool disc
- 301301
- zentrale Durchgangsöffnungcentral passage opening
- ARAR
- axiale Richtungaxial direction
- BWBW
- Berührungswinkelcontact angle
- Uu
- Umfangsrichtungcircumferential direction
Claims (11)
dadurch gekennzeichnet, dass die Schraube (2) in einem Koppelmodul (1) der Spannvorrichtung (10) gelagert ist, wobei das Koppelmodul (1) eine Innenkontur (16) aufweist, die in Umfangsrichtung (UR) formschlüssig verdrehsicher mit der Antriebsspindel (20) gepaart oder paarbar ist.Clamping device (10) for the axial (AR) clamping of a tool disk (300) on a flange (30) associated with a drive spindle (20) of a hand-held power tool (100), the clamping device (10) having a screw (2) which, for clamping the tool disk (300) is to be screwed into an internal thread (22) of the drive spindle (20),
characterized in that the screw (2) is mounted in a coupling module (1) of the clamping device (10), the coupling module (1) having an inner contour (16) which in the circumferential direction (UR) is positively locked against rotation with the drive spindle (20) is paired or pairable.
dadurch gekennzeichnet, dass die Spannvorrichtung (10) einen Handknauf (3) aufweist, der in Umfangsrichtung (UR) formschlüssig verdrehsicher mit der Schraube (2) ausgebildet ist.Clamping device (10) according to claim 1,
characterized in that the clamping device (10) has a hand knob (3) which is formed in a form-fitting, non-rotatable manner with the screw (2) in the circumferential direction (UR).
dadurch gekennzeichnet, dass die Spannvorrichtung (10) ein Spannglied, vorzugsweise in Form eines Federblechs (4) aufweist, das mittels des Koppelmoduls (1) mit einer axialen Spannkraft beaufschlagt werden kann um derart die Werkzeugscheibe (300) gegen den Flansch (30) zu verspannen.Clamping device (10) according to claim 1 or 2,
characterized in that the clamping device (10) has a clamping element, preferably in the form of a spring plate (4), which can be subjected to an axial clamping force by means of the coupling module (1) in order in this way to press the tool disk (300) against the flange (30). tense up
dadurch gekennzeichnet, dass die Schraube (2) über ein Wälzlager in dem Koppelmodul (1) gelagert ist.Clamping device (10) according to one of the preceding claims,
characterized in that the screw (2) is mounted in the coupling module (1) via a roller bearing.
dadurch gekennzeichnet, dass das Wälzlager als Schrägkugellager (5) ausgebildet ist, wobei das Schrägkugellager vorzugsweise einen Berührungswinkel (BW) zwischen 35 Grad und 45 Grad aufweist.Clamping device (10) according to claim 4,
characterized in that the roller bearing is designed as an angular ball bearing (5), the angular ball bearing preferably having a contact angle (BW) of between 35 degrees and 45 degrees.
dadurch gekennzeichnet, dass die Spannvorrichtung (10) einen Elastomerring (6) aufweist, der vorzugsweise zwischen einem Kopf (2') der Schraube (2) und einem Kragen (11) des Koppelmoduls (1) angeordnet ist.Clamping device (10) according to one of the preceding claims,
characterized in that the clamping device (10) has an elastomer ring (6) which is preferably arranged between a head (2') of the screw (2) and a collar (11) of the coupling module (1).
dadurch gekennzeichnet, dass die Spannvorrichtung (10) einen Haltering (7) aufweist mittels dem das Koppelmodul (1) an der Schraube (2) gehalten wird.Clamping device (10) according to claim 6,
characterized in that the clamping device (10) has a retaining ring (7) by means of which the coupling module (1) is held on the screw (2).
dadurch gekennzeichnet, dass das Spannglied mittels eines Sicherungsrings (8) am Koppelmodul (1) gehalten wird.Clamping device (10) according to one of claims 3 to 7,
characterized in that the clamping element is held on the coupling module (1) by means of a locking ring (8).
dadurch gekennzeichnet, dass die Spannvorrichtung (10) einen Anschlag (9) aufweist über den eine Auslenkung des Spannglieds mittelbar oder unmittelbar begrenzt ist.Clamping device (10) according to one of claims 3 to 8,
characterized in that the clamping device (10) has a stop (9) via which a deflection of the clamping member is directly or indirectly limited.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17198870.2A EP3476539A1 (en) | 2017-10-27 | 2017-10-27 | Tensioning device and handheld machine tool |
PCT/EP2018/078225 WO2019081275A1 (en) | 2017-10-27 | 2018-10-16 | Clamping device and hand-held power tool |
EP18783530.1A EP3700710B1 (en) | 2017-10-27 | 2018-10-16 | Tensioning device and handheld machine tool |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18783530.1A Division-Into EP3700710B1 (en) | 2017-10-27 | 2018-10-16 | Tensioning device and handheld machine tool |
EP18783530.1A Division EP3700710B1 (en) | 2017-10-27 | 2018-10-16 | Tensioning device and handheld machine tool |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4227040A1 true EP4227040A1 (en) | 2023-08-16 |
Family
ID=60190723
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17198870.2A Withdrawn EP3476539A1 (en) | 2017-10-27 | 2017-10-27 | Tensioning device and handheld machine tool |
EP18783530.1A Active EP3700710B1 (en) | 2017-10-27 | 2018-10-16 | Tensioning device and handheld machine tool |
EP23173701.6A Pending EP4227040A1 (en) | 2017-10-27 | 2018-10-16 | Clamping device and hand-held power tool |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17198870.2A Withdrawn EP3476539A1 (en) | 2017-10-27 | 2017-10-27 | Tensioning device and handheld machine tool |
EP18783530.1A Active EP3700710B1 (en) | 2017-10-27 | 2018-10-16 | Tensioning device and handheld machine tool |
Country Status (5)
Country | Link |
---|---|
US (1) | US12011802B2 (en) |
EP (3) | EP3476539A1 (en) |
JP (1) | JP7097957B2 (en) |
CN (1) | CN111278601A (en) |
WO (1) | WO2019081275A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112846385B (en) * | 2021-01-08 | 2022-07-26 | 山东聊城鼎诚激光设备有限公司 | Equidistant cutting equipment for bulletproof glass fiber board |
CN113696107A (en) * | 2021-09-08 | 2021-11-26 | 江苏锋泰工具有限公司 | Shock attenuation light-duty rubber diamond grinding wheel |
CN113681474A (en) * | 2021-09-08 | 2021-11-23 | 江苏锋泰工具有限公司 | Preparation method of shock-absorbing light rubber diamond grinding wheel |
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EP3202533A1 (en) * | 2016-02-02 | 2017-08-09 | HILTI Aktiengesellschaft | Clamping device |
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JPS6124153U (en) * | 1984-07-13 | 1986-02-13 | 芝浦メカトロニクス株式会社 | disc grinder |
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JPH0727121A (en) * | 1993-06-30 | 1995-01-27 | Jacobs Japan Inc | Screw for tightening |
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JP4964642B2 (en) * | 2007-03-27 | 2012-07-04 | 株式会社マキタ | Rotating blade fixing device |
CN201284780Y (en) * | 2008-08-18 | 2009-08-05 | 强网工业股份有限公司 | Easily detachable locking device |
WO2015075001A1 (en) * | 2013-11-25 | 2015-05-28 | Robert Bosch Gmbh | Tool free bolt system for a saw blade |
JP6400460B2 (en) * | 2014-01-30 | 2018-10-03 | 株式会社マキタ | Cutting machine |
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-
2017
- 2017-10-27 EP EP17198870.2A patent/EP3476539A1/en not_active Withdrawn
-
2018
- 2018-10-16 WO PCT/EP2018/078225 patent/WO2019081275A1/en unknown
- 2018-10-16 EP EP18783530.1A patent/EP3700710B1/en active Active
- 2018-10-16 US US16/755,749 patent/US12011802B2/en active Active
- 2018-10-16 CN CN201880068975.4A patent/CN111278601A/en active Pending
- 2018-10-16 EP EP23173701.6A patent/EP4227040A1/en active Pending
- 2018-10-16 JP JP2020521581A patent/JP7097957B2/en active Active
Patent Citations (4)
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DE6909435U (en) * | 1969-03-07 | 1969-07-10 | Metabowerke Kg | CLAMPING DEVICE FOR THE SAW BLADE ON A CIRCULAR SAW |
JPH07299743A (en) * | 1994-05-10 | 1995-11-14 | Ryobi Ltd | Tool fastening device |
EP2123380A1 (en) * | 2007-01-09 | 2009-11-25 | Makita Corporation | Rotary blade tool fixing device |
EP3202533A1 (en) * | 2016-02-02 | 2017-08-09 | HILTI Aktiengesellschaft | Clamping device |
Also Published As
Publication number | Publication date |
---|---|
EP3700710B1 (en) | 2023-07-26 |
CN111278601A (en) | 2020-06-12 |
WO2019081275A1 (en) | 2019-05-02 |
US12011802B2 (en) | 2024-06-18 |
EP3700710A1 (en) | 2020-09-02 |
US20200324385A1 (en) | 2020-10-15 |
JP2020536760A (en) | 2020-12-17 |
JP7097957B2 (en) | 2022-07-08 |
EP3476539A1 (en) | 2019-05-01 |
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