EP0152564B1 - Tool mounting - Google Patents

Tool mounting Download PDF

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Publication number
EP0152564B1
EP0152564B1 EP19840114612 EP84114612A EP0152564B1 EP 0152564 B1 EP0152564 B1 EP 0152564B1 EP 19840114612 EP19840114612 EP 19840114612 EP 84114612 A EP84114612 A EP 84114612A EP 0152564 B1 EP0152564 B1 EP 0152564B1
Authority
EP
European Patent Office
Prior art keywords
spindle
tool
grinding wheel
draw
displacement
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
Application number
EP19840114612
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German (de)
French (fr)
Other versions
EP0152564A3 (en
EP0152564A2 (en
Inventor
& E. Fein Gmbh & Co. C.
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Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27191695&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0152564(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19843405885 external-priority patent/DE3405885C1/en
Priority claimed from DE19843414148 external-priority patent/DE3414148A1/en
Priority claimed from DE19843431901 external-priority patent/DE3431901A1/en
Application filed by Individual filed Critical Individual
Publication of EP0152564A2 publication Critical patent/EP0152564A2/en
Publication of EP0152564A3 publication Critical patent/EP0152564A3/en
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Publication of EP0152564B1 publication Critical patent/EP0152564B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/022—Spindle-locking devices, e.g. for mounting or removing the tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools
    • 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

Definitions

  • the invention relates to a device for fastening a tool in portable angle grinders, which allows the attachment to be released without an auxiliary tool.
  • the fastening flange which is firmly connected to the grinding spindle, must be held with an auxiliary tool. Then the counter flange, which is screwed onto the grinding spindle, can be loosened with a second auxiliary tool. This procedure is extremely cumbersome, involves great risk of injury and is also very time-consuming.
  • z. B. proposed in DE-PS-2 926 469 to lock the grinding spindle via a device integrated in the gear housing.
  • the advantage of this solution is that only one auxiliary tool is required to loosen the counter flange.
  • the user of such an angle grinder will often look for the auxiliary tool for loosening the counter flange, which is just not at hand.
  • a number of cases are known from practice in which the tool attachment was then forcibly released. The tool was damaged in many cases.
  • the user is not spared the hand holding the auxiliary tool to make a movement relative to the cutting edge of the tool, which keeps the risk of injury the same as compared to the old method.
  • An additional disadvantage is the design effort that must be made to secure the angle grinder against unintentional switching on.
  • a polishing device with a hollow spindle in which a tension spindle is held spring-loaded.
  • a pressure plate is provided which serves as a system for a polishing plate fastened to the pull spindle, so that a polishing cloth can be clamped between the polishing plate and the pressure plate.
  • the polishing cloth is clamped between the pressure plate and the polishing plate by the tension spindle spring-loaded in the direction away from the tool. Removal of the polishing cloth is possible in that the pull spindle can be acted on axially via a push button held on the polishing device, so that it moves together with the polishing plate away from the pressure plate and releases the polishing cloth clamped between them.
  • the invention has for its object to provide a device for releasably clamping a tool, in particular a grinding wheel, a hand-held angle grinder, in which no auxiliary tool for releasing and tightening the device when clamping the tool is required, so far usual tools, ie previously known grinding wheels are said to be usable.
  • a portable angle grinder with a device for fastening a tool which comprises a motor, an angular gear and a clamping point for the tool, the angular gear essentially comprising a motor pinion, a bevel gear and a drive shaft, with a hollow grinding spindle , which carries a counter flange on the tool side, with a traction spindle that can be displaced in the axial direction towards the tool in this grinding spindle against the force of spring elements and with a manually operable displacement device, by means of which an end piece of the traction spindle can be acted on from outside a gear housing and thus the traction spindle in the direction of the Tool is displaceable, solved in that the displacement device is designed to remain in a position exciting the tool and in a position releasing the tool, and an actuating element and one connected to it and with one transverse to it Axial direction of the grinding spindle extending inclined surface provided lifting element, the lifting element acting upon actuation of the displacement device
  • a tool attachment in which, after actuation of a displacement device, a spindle is displaced in the axial direction in a hollow drive shaft.
  • the displacement device is located at one end of the spindle, and the spindle is threaded at the other end.
  • the thread is used to screw on a nut. With this nut, the tool is pressed onto a counter flange, which is firmly connected to the drive shaft. The drive movement of the drive shaft can thus be transferred to the tool will wear.
  • a further variant of the present invention is based on the object, likewise a device for releasably clamping a tool, in particular a grinding wheel, of a hand-held angle grinder to create, in which no auxiliary tool for loosening or tightening the device when clamping the tool is required, previously common tools, ie Previously known grinding wheels should be usable and the device should also be designed so that the tool is no longer changed by turning a nut.
  • a portable angle grinder with a device for fastening a tool which comprises a motor, an angular gear and a clamping point for the tool, the angular gear essentially comprising a motor pinion, a bevel gear and a drive shaft, with a Hollow grinding spindle, which carries a counter flange, with an axially displaceable traction spindle in the grinding spindle, and with a displacement device for the traction spindle, solved in that the displacement device is designed in a position that excites the tool and remains in a position releasing the tool, that the position in which Hollow grinding spindle arranged pulling spindle is provided on its end facing away from the displacement device with a gripping device which can be actuated by sliding the pulling spindle, and that the tool can be clamped between a flange which can be gripped by the gripping device and the counterflange.
  • the screw fastening was thus replaced by a plug fastening.
  • a bore is machined on the end face of the spindle, which has a cross section similar to that of a pin facing it on the end face of the fastening bolt.
  • the spindle has slots in the area of the bore, in the manner of a collet, so that the jaws of this clamping device can move in the radial direction. This radial movement is achieved in that the spindle is displaced axially in a hollow drive shaft by the displacement device and an outer cone provided in the slotted area of the spindle can slide onto an inner cone provided at a corresponding point on the drive shaft.
  • the lateral surface of the pin and the wall of the bore have transverse grooves, so that they can engage with one another under radial pressure on the slotted spindle.
  • a groove with a resilient locking element attached to it is provided on the outer surface of the fastening bolt.
  • the resilient locking element snaps into a corresponding groove in the hollow drive shaft as soon as it has reached it.
  • the fastening bolt is designed so that when this locking point is not reached, the fastening bolt is only loosely seated in the drive shaft, which makes it easy to see that it must be pressed in even deeper.
  • the object of a further variant of the invention is to provide a device for releasably clamping a tool, in particular a grinding wheel, to create a hand-held angle grinder, in which no auxiliary tool for releasing or tightening the device when clamping the tool is required, and which is also designed so that the clamping of the tool with strong acceleration forces, ie e.g. B. does not solve when braking the rotating grinding wheel.
  • a portable angle grinder with a device for fastening a tool which comprises a motor, an angular gear and a clamping point for the tool, the angular gear essentially consisting of a motor pinion, a bevel gear and a drive shaft, with an in a grinding spindle axially displaceable traction spindle, with a displacement device, by means of which the traction spindle can be displaced in the direction of the tool, and with a counter flange held on the tool side on the grinding spindle, solved according to the invention in that the displacement device remains in a position exciting the tool and in a position releasing the tool is designed that a bolt can be screwed into the tool spindle and the front side, that the bolt is provided with a flange on its end remote from the spindle, that with the flange via an intermediate sleeve which is also provided with a flange, the work Stuff is pressed onto the counter flange, and that the sleeve
  • This solution provides that a pin is inserted on the end face of the spindle which is axially displaceably mounted in the hollow drive shaft is screwed, which is provided on its end facing away from the spindle with a flange, with which he presses the tool on the counterflange of the drive shaft via an intermediate sleeve which is also provided with a flange.
  • the sleeve is provided on the outer surface of its cylindrical part with teeth in the axial direction. This axial movement of the spindle lifts the nut, which presses the tool onto the counter flange, from the tool. Then you can easily loosen the knurled nut from the spindle by turning it. An auxiliary tool for loosening the nut is not necessary with this arrangement.
  • the effort to manufacture the displacement device is roughly equivalent to what it has to be done to integrate a spindle lock in the gear housing.
  • the angle grinder shown in FIG. 1 essentially shows a motor 14 shown broken off, a gear 1 connected to it and a tool 23.
  • the rotational movement of the motor is transmitted via a pinion 13 to a bevel gear 15 which is connected in a rotationally fixed manner to a drive shaft 16.
  • the drive shaft 16 is supported by two bearings 3 and 17 on opposite sides in the transmission housing 2. At one end of the drive shaft 16 there is a displacement device 6 to be actuated from outside the transmission housing 2. At the other end, the drive shaft 16 projects so far out of the transmission housing 2 out that on its periphery a counter flange 22, which serves to fasten the tool 23, can be rigidly connected to it.
  • the drive shaft 16 is hollow for receiving a spindle 20.
  • the spindle 20 protrudes over the end faces of the drive shaft 16.
  • the spindle 16 is z over a certain range.
  • B. provided with teeth 18.
  • the teeth 18 find their correspondence in the inner bore of the drive shaft 16. This positive connection ensures that the spindle 20 rotates synchronously with the drive shaft 16. The possibility that the spindle 20 can be moved in the axial direction relative to the drive shaft 16 remains.
  • a lever 12 arranged outside the transmission housing 2 is screwed into the transmission housing 2 with its cylindrical extension 9.
  • the axis of the threaded bore in the gear housing 2 and that of the cylindrical extension 9 lies in the extension of the axis of the spindle 20.
  • the drive shaft 16, which is rotatably supported by the two bearings 3 and 17, is on its end projecting beyond the bearing 3 with a provided sleeve-shaped cover 11, which has a circular opening for the spindle 20 in its bottom part 10.
  • a spring 4 is arranged, which presses a concentric extension 5 of the spindle 20 against the bottom part 10.
  • An end piece 7 of the spindle 20, which projects through the opening in the base part 10, extends into a recess 8 of the cylindrical extension 9.
  • the mutually facing surfaces on the end piece 7 and the depression 8 are designed in such a way that that when starting the machine, the frictional force between the two surfaces is sufficient to bring the lever 12 into the "closed position".
  • FIGS. 2, 3 and 4 are variants of the displacement device 6 according to FIG. 1, which have the effect that the dimensions of the gear housing can be kept smaller.
  • the spindle 20 is axially displaced via a displacement device 25.
  • the displacement device 25 consists of a slide button 27, which can slide on rails 29 in the gear housing 2.
  • the sliding button 27 projects with a grip surface 26 through an opening 28 and beyond the outer contour of the transmission housing 2.
  • the slide button 27 is provided with two cover strips 24 each extending over the opening 28.
  • the sliding button 27 has an inclined surface 30 on its side facing the spindle 20.
  • the displacement device 33 is arranged so that it z. B. is not inadvertently adjusted when putting down the angle grinder.
  • 2 troughs 32 are provided in the gear housing in each case in the area of the meeting of the two side surfaces and the side of the gear housing 2 facing away from the tool 23.
  • These troughs 32 have openings for a push rod 35 which can be moved transversely to the axis of the drive shaft 16.
  • the push rod 35 is guided laterally past the end piece 34.
  • a spring element 36 mounted obliquely on the push rod 35 presses a bead on the end piece 34 in the direction of the clamping point.
  • the inclined spring element 36 thus has the same effect as the inclined surface 30 according to the exemplary embodiment in FIG. 2.
  • the end piece 34 can also rotate if the user has forgotten the push rod 35 before switching on of the motor in the "close" position.
  • the angle grinder shown in FIG. 5 essentially has a motor 7 ', a gear 1' and a tool 21 '.
  • the rotational movement of the motor 7 ' is transmitted to a bevel gear 20' via a pinion 6 '.
  • the bevel gear 20 ' is non-rotatably and axially immovably connected to a drive shaft 5'.
  • the drive shaft 5 ' is supported in two bearings which are fixed in the housing 2' of the transmission 1 '.
  • a spindle 3' guided in the hollow drive shaft 5 ' can be displaced in the axial direction, as is described for FIG. 1.
  • the slots 18 ' allow the end of the spindle 3' to be pressed in the radial direction. This pressure should arise when the fastening bolt 12 'has been inserted into the drive shaft 5' and the pin 11 'is in the bore 10'. Then the displacement device is brought into the "closing" position and thus the spindle 3 'is moved away from the tool 21'. The pin 11 'is then clamped in the bore 10' of the spindle 3 'by an outer cone 9' of the spindle 3 'in the region of the slots 18' and a corresponding inner cone 8 'on the drive shaft 5'. In order to achieve a positive connection, the pin 11 'is provided on its lateral surface and the bore 10' on its wall with transverse grooves.
  • a resilient locking element 16 ' is inserted in a circumferential groove 14' of the fastening bolt 12 '. Only when the resilient locking element 16 'engages in a groove 17' of the hollow drive shaft 5 'is the point reached at which a positive connection between the pin 11' and the spindle 3 'can be established. Otherwise, the tolerances between the fastening bolt 12 'and the drive shaft 5' are selected such that the fastening bolt 12 'is only loosely guided in the drive shaft 5'.
  • the gear head 1 has, on one side, a displacement device 6" protruding from the transmission housing 2 ".
  • the displacement device 6" consists essentially of an actuating element 12 "and a lifting element 9".
  • the lifting element 9" firmly connected to the actuating element 12 "is screwed in or out of the thread provided in the gear housing 2".
  • the screwing or unscrewing takes place in the axial direction of a drive shaft 16 "mounted in the transmission housing 2".
  • a spindle 20 is axially displaceably mounted in the hollow drive shaft 16" and, as shown in the first-mentioned exemplary embodiment, can be displaced in the axial direction against the force of spring elements 4 "by the displacement device 6".
  • the drive shaft 16 is provided at one end with a sleeve-shaped cover 11", which has a circular opening for the spindle 20 “in its bottom part 10".
  • the spring elements 4 ′′ are arranged which press a concentric shoulder 5 ′′ of the spindle 20 ′′ against the base part 10 ′′.
  • An end piece 7 ′′ of the spindle 20 ", which protrudes through the opening in the bottom part 10" extends into a recess 8 "of the cylindrical extension 9".
  • a counter flange 22 is provided on the drive shaft 16".
  • a tool 23 "bears against this counter flange 22".
  • the tool 23 is centered by a shoulder on the counter flange 22".
  • the tool 23 is pressed against the counter flange 22" by a flange 57 “of a bolt 56" indirectly through the flange 53 "of a sleeve 54".
  • the contact pressure is generated in that the bolt 56 "is inserted through the cylindrical part 55" of the sleeve 54 "and with its threaded front part is screwed into a corresponding internal thread of the spindle 20" and, after screwing in the bolt 56 ", the actuating element 12" of the displacement device 6 "is brought into the” closing "position. This achieves a sufficient contact pressure for the use of the tool 23".
  • the hollow drive shaft 16 ′′ has an enlarged bore in the area of the counter flange 22 ′′.
  • the wall of the enlarged bore is provided with longitudinal grooves 51 ".
  • the corresponding toothing 52" on the lateral surface of the cylindrical part 55 "of the sleeve 54" can be inserted into the longitudinal grooves 51 ". This ensures a positive transmission of the rotary movement of the drive shaft 16" the sleeve 54 ".

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

Description

Gegenstand der Erfindung ist eine Einrichtung zum Befestigen eines Werkzeugs bei tragbaren Winkelschleifern, die das Lösen der Befestigung ohne Hilfswerkzeug erlaubt.The invention relates to a device for fastening a tool in portable angle grinders, which allows the attachment to be released without an auxiliary tool.

Um bei den derzeit bekannten Winkelschleifern die Schleifscheibe wechseln zu können, muß mit einem Hilfswerkzeug der Befestigungsflansch, der mit der Schleifspindel fest verbunden ist, gehalten werden. Dann kann der Gegenflansch, der auf die Schleifspindel aufgeschraubt ist, mit einem zweiten Hilfswerkzeug gelöst werden. Dieses Verfahren ist äußerst umständlich, birgt große Verletzungsgefahren und ist auch noch sehr zeitraubend.In order to be able to change the grinding wheel in the currently known angle grinders, the fastening flange, which is firmly connected to the grinding spindle, must be held with an auxiliary tool. Then the counter flange, which is screwed onto the grinding spindle, can be loosened with a second auxiliary tool. This procedure is extremely cumbersome, involves great risk of injury and is also very time-consuming.

Aus diesem Grund wurde z. B. in der DE-PS-2 926 469 vorgeschlagen, die Schleifspindel über eine fest ins Getriebegehäuse integrierte Vorrichtung zu arretieren. Der Vorteil dieser Lösung liegt darin, daß nur noch ein Hilfswerkzeug zum Lösen des Gegenflansches gebraucht wird. Doch wird der Benützer eines derartigen Winkelschleifers öfters nach dem, gerade nicht griffbereiten, Hilfswerkzeug zum Lösen des Gegenflansches suchen. Aus der Praxis sind etliche Fälle bekannt, bei denen es dann zum gewaltsamen Lösen der Werkzeugbefestigung kam. Dabei wurde in vielen Fällen das Werkzeug beschädigt. Weiter bleibt dem Benützer nicht erspart mit der Hand, die das Hilfswerkzeug hält, eine Relativbewegung zur Schneidkante des Werkzeugs durchzuführen, was die Gefahr der Verletzung gegenüber der alten Methode gleich groß hält. Als zusätzlicher Nachteil ist der konstruktive Aufwand zu betrachten, der erbracht werden muß, um den Winkelschleifer gegen unbeabsichtigtes Einschalten zu sichern.For this reason, z. B. proposed in DE-PS-2 926 469 to lock the grinding spindle via a device integrated in the gear housing. The advantage of this solution is that only one auxiliary tool is required to loosen the counter flange. However, the user of such an angle grinder will often look for the auxiliary tool for loosening the counter flange, which is just not at hand. A number of cases are known from practice in which the tool attachment was then forcibly released. The tool was damaged in many cases. Furthermore, the user is not spared the hand holding the auxiliary tool to make a movement relative to the cutting edge of the tool, which keeps the risk of injury the same as compared to the old method. An additional disadvantage is the design effort that must be made to secure the angle grinder against unintentional switching on.

Aus dem deutschen Gebrauchsmuster 1 824 252 ist ein Poliergerät mit einer hohlen Spindel bekannt, in welcher eine Zugspindel federbeaufschlagt gehalten ist. Am werkzeugseitigen Ende der hohlen Spindel ist eine Druckplatte vorgesehen, welche als Anlage für eine an der Zugspindel befestigte Polierplatte dient, so daß zwischen der Polierplatte und der Druckplatte ein Poliertuch einklemmbar ist. Durch die in Richtung von dem Werkzeug weg federbeaufschlagte Zugspindel wird das Poliertuch zwischen der Druckplatte und der Polierplatte eingeklemmt gehalten. Eine Entfernung des Poliertuchs ist dadurch möglich, daß über einem am Poliergerät gehaltenen Druckknopf in axialer Richtung auf die Zugspindel eingewirkt werden kann, so daß sich diese zusammen mit der Polierplatte von der Druckplatte wegbewegt und das zwischen diesen eingespannte Poliertuch freigibt.From German utility model 1 824 252 a polishing device with a hollow spindle is known, in which a tension spindle is held spring-loaded. At the tool-side end of the hollow spindle, a pressure plate is provided which serves as a system for a polishing plate fastened to the pull spindle, so that a polishing cloth can be clamped between the polishing plate and the pressure plate. The polishing cloth is clamped between the pressure plate and the polishing plate by the tension spindle spring-loaded in the direction away from the tool. Removal of the polishing cloth is possible in that the pull spindle can be acted on axially via a push button held on the polishing device, so that it moves together with the polishing plate away from the pressure plate and releases the polishing cloth clamped between them.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Einrichtung zum lösbaren Einspannen eines Werkzeugs, insbesondere einer Schleifscheibe, eines handgeführten Winkelschleifers zu schaffen, bei welcher kein Hilfswerkzeug zum Lösen und Anziehen der Einrichtung beim Einspannen des Werkzeugs benötigt wird, wobei bisher übliche Werkzeuge, d.h. bisher bekannte Schleifscheiben, verwendbar sein sollen.Based on this prior art, the invention has for its object to provide a device for releasably clamping a tool, in particular a grinding wheel, a hand-held angle grinder, in which no auxiliary tool for releasing and tightening the device when clamping the tool is required, so far usual tools, ie previously known grinding wheels are said to be usable.

Diese Aufgabe wird bei einem tragbaren Winkelschleifer versehen mit einer Einrichtung zum Befestigen eines Werkzeugs welcher einen Motor, ein Winkelgetriebe und eine Einspannstelle für das Werkzeug, wobei das Winkelgetriebe im wesentlichen aus einem Motorritzel, einem Kegelrad und einer Antriebswelle besteht, umfassen, mit einer hohlen Schleifspindel, welche werkzeugseitig einen Gegenflansch trägt, mit einer in dieser Schleifspindel gegen die Kraft von Federelementen in axialer Richtung auf das Werkzeug zu verschiebbaren Zugspindel und mit einer handbetätigbaren Verschiebeeinrichtung, durch welche von außerhalb eines Getriebegehäuses ein Endstück der Zugspindel beaufschlagbar und somit die Zugspindel in Richtung des Werkzeugs verschiebbar ist, dadurch gelöst, daß die Verschiebeeinrichtung in einer das Werkzeug spannenden Stellung und in einer das Werkzeug freigebenden Stellung verharrend ausgebildet ist und ein Betätigungselement und ein mit diesem verbundenes sowie mit einer quer zur Achsrichtung der Schleifspindel verlaufenden schrägen Fläche versehenes Hubelement aufweist, wobei das Hubelement bei Betätigung der Verschiebeeinrichtung durch die schräge Fläche auf das Endstück einwirkt, daß die Zugspindel werkzeugseitig mit einem Gewindezapfen versehen ist, auf welchen in der das Werkzeug freigebenden Stellung eine Mutter von Hand aufschraubbar ist, und daß das Werkzeug zwischen dem Gegenflansch und der Mutter einspannbar ist.This object is provided in a portable angle grinder with a device for fastening a tool, which comprises a motor, an angular gear and a clamping point for the tool, the angular gear essentially comprising a motor pinion, a bevel gear and a drive shaft, with a hollow grinding spindle , which carries a counter flange on the tool side, with a traction spindle that can be displaced in the axial direction towards the tool in this grinding spindle against the force of spring elements and with a manually operable displacement device, by means of which an end piece of the traction spindle can be acted on from outside a gear housing and thus the traction spindle in the direction of the Tool is displaceable, solved in that the displacement device is designed to remain in a position exciting the tool and in a position releasing the tool, and an actuating element and one connected to it and with one transverse to it Axial direction of the grinding spindle extending inclined surface provided lifting element, the lifting element acting upon actuation of the displacement device through the inclined surface on the end piece that the traction spindle is provided on the tool side with a threaded pin on which a nut can be screwed on by hand in the position releasing the tool , and that the tool can be clamped between the counter flange and the nut.

Durch diese axiale Bewegung der Spindel wird die Mutter, die das Werkzeug auf den Gegenflansch drückt, vom Werkzeug abgehoben. Danach kann man leicht die mit einer Rändel versehene Mutter von der Spindel durch Drehen lösen. Ein Hilfswerkzeug zum Lösen der Mutter ist bei dieser Anordnung nicht nötig. Außerdem ist der Aufwand zur Herstellung der Verschiebeeinrichtung in etwa dem gleichzusetzen, wie er erbracht werden muß, um eine Spindelarretierung im Getriebegehäuse zu integrieren. Dadurch, daß man die Mutter beim Montieren und Lösen direkt mit der Hand anfaßt und nicht mit einem Hilfswerkzeug auf- oder abschraubt, kommt die Hand mit der Schneidkante nicht mehr in Berührung. Das verringert die Verletzungsgefahr durch das Werkzeug.This axial movement of the spindle lifts the nut, which presses the tool onto the counter flange, from the tool. Then you can easily loosen the knurled nut from the spindle by turning it. An auxiliary tool for loosening the nut is not necessary with this arrangement. In addition, the effort to manufacture the displacement device is roughly equivalent to what it has to be done to integrate a spindle lock in the gear housing. By touching the nut directly with the hand during assembly and loosening and not screwing it on or off with an auxiliary tool, the hand no longer comes into contact with the cutting edge. This reduces the risk of injury from the tool.

In vorstehender Beschreibung ist eine Werkzeugbefestigung dargestellt, bei der nach Betätigung einer Verschiebeeinrichtung eine Spindel in einer hohl ausgebildeten Antriebswelle in axialer Richtung verschoben wird. An dem einen Ende der Spindel befindet sich die Verschiebeeinrichtung, am anderen Ende ist die Spindel mit einem Gewinde versehen. Das Gewinde dient zum Aufschrauben einer Mutter. Mit dieser Mutter wird das Werkzeug auf einen Gegenflansch gedrückt, der fest mit der Antriebswelle verbunden ist. Die Antriebsbewegung der Antriebswelle kann somit auf das Werkzeug übertragen werden.In the above description, a tool attachment is shown in which, after actuation of a displacement device, a spindle is displaced in the axial direction in a hollow drive shaft. The displacement device is located at one end of the spindle, and the spindle is threaded at the other end. The thread is used to screw on a nut. With this nut, the tool is pressed onto a counter flange, which is firmly connected to the drive shaft. The drive movement of the drive shaft can thus be transferred to the tool will wear.

Diese Befestigungsart gestattet somit eine wesentlich einfachere Handhabung beim Werkzeugwechsel als bisher möglich war.This type of fastening thus allows much easier handling when changing tools than was previously possible.

Weitere vorteilhafte Ausführungsbeispiele sind Gegenstand der Unteransprüche 2 bis 9.Further advantageous exemplary embodiments are the subject matter of subclaims 2 to 9.

Um den Werkzeugwechsel noch schneller vornehmen zu können und vor allem, um den Werkzeugwechsel bei der Handhabung durch Roboter zu erleichtern, liegt eine weitere Variante der vorliegenden Erfindung die Aufgabe zugrunde, ebenfalls eine Einrichtung zum lösbaren Einspannen eines Werkzeugs, insbesondere einer Schleifscheibe, eines handgeführten Winkelschleifers zu schaffen, bei welcher kein Hilfswerkzeug zum Lösen oder Anziehen der Einrichtung beim Einspannen des Werkzeugs benötigt wird, wobei bisher übliche Werkzeuge, d.h. bisher bekannte Schleifscheiben, verwendbar sein sollen und außerdem die Einrichtung so gestaltet sein soll, daß das Wechseln des Werkzeugs nicht mehr durch Drehen einer Mutter erfolgt.In order to be able to carry out the tool change even more quickly and above all to facilitate the tool change when handling by robots, a further variant of the present invention is based on the object, likewise a device for releasably clamping a tool, in particular a grinding wheel, of a hand-held angle grinder to create, in which no auxiliary tool for loosening or tightening the device when clamping the tool is required, previously common tools, ie Previously known grinding wheels should be usable and the device should also be designed so that the tool is no longer changed by turning a nut.

Diese Aufgabe wird erfindungsgemäß bei einem tragbaren Winkelschleifer versehen mit einer Einrichtung zum Befestigen eines Werkzeugs, welcher einen Motor, ein Winkelgetriebe und eine Einspannstelle für das Werkzeug, wobei das Winkelgetriebe im wesentlichen aus einem Motorritzel, einem Kegelrad und einer Antriebswelle besteht, umfassen, mit einer hohlen Schleifspindel, welche einen Gegenflansch trägt, mit einer in der Schleifspindel axial verschiebbaren Zugspindel, und mit einer Verschiebeeinrichtung für die Zugspindel, dadurch gelöst, daß die Verschiebeeinrichtung in einer das Werkzeug spannenden und einer das Werkzeug freigebenden Stellung verharrend ausgebildet ist, daß die in der hohlen Schleifspindel angeordnete Zugspindel auf ihrem der Verschiebeeinrichtung abgekehrten Ende mit einer durch Verschieben der Zugspindel betätigbaren Greifeinrichtung versehen ist, und daß das Werkzeug zwischen einem durch die Greifeinrichtung greifbaren Flansch und dem Gegenflansch einspannbar ist.This object is provided according to the invention in a portable angle grinder with a device for fastening a tool, which comprises a motor, an angular gear and a clamping point for the tool, the angular gear essentially comprising a motor pinion, a bevel gear and a drive shaft, with a Hollow grinding spindle, which carries a counter flange, with an axially displaceable traction spindle in the grinding spindle, and with a displacement device for the traction spindle, solved in that the displacement device is designed in a position that excites the tool and remains in a position releasing the tool, that the position in which Hollow grinding spindle arranged pulling spindle is provided on its end facing away from the displacement device with a gripping device which can be actuated by sliding the pulling spindle, and that the tool can be clamped between a flange which can be gripped by the gripping device and the counterflange.

Bei der erfindungsgemäßen Lösung wurde somit die Schraubbefestigung durch eine Steckbefestigung ersetzt. Um einen Befestigungsbolzen in die Spindel stecken zu können, ist auf der Stirnseite der Spindel eine Bohrung eingearbeitet, die einen ähnlichen Querschnitt hat wie ein ihr zugekehrter Zapfen auf der Stirnseite des Befestigungsbolzens. Die Spindel weist im Bereich der Bohrung, nach Art einer Spannzange, Schlitze auf, so daß die Backen dieser Spanneinrichtung sich in radialer Richtung bewegen können. Diese radiale Bewegung wird dadurch erreicht, daß die Spindel in einer hohlen Antriebswelle durch die Verschiebeeinrichtung axial verschoben wird und ein im geschlitzten Bereich der Spindel vorgesehener Außenkonus auf einen an entsprechender Stelle der Antriebswelle vorgesehenen Innenkonus gleiten kann. Damit ein sicherer Formschluß zwischen Zapfen und Bohrung erreicht wird, weist die Mantelfläche des Zapfens und die Wandung der Bohrung Quernuten auf, so daß sie beim radialen Druck auf die geschlitzte Spindel ineinander greifen können. Um festzustellen, ob der Befestigungsbolzen genügend weit in die Spannstelle eingedrückt wurde, ist eine Nut mit darauf angebrachtem federndem Rastelement auf der Mantelfläche des Befestigungsbolzens vorgesehen. Das federnde Rastelement rastet in eine entsprechende Nut in der hohlen Antriebswelle ein, sobald sie diese erreicht hat. Der Befestigungsbolzen ist so ausgebildet, daß bei Nichterreichen dieses Rastpunkts der Befestigungsbolzen nur locker in der Antriebswelle sitzt, wodurch es leicht zu erkennen ist, daß er noch tiefer eingedrückt werden muß.In the solution according to the invention, the screw fastening was thus replaced by a plug fastening. In order to be able to insert a fastening bolt into the spindle, a bore is machined on the end face of the spindle, which has a cross section similar to that of a pin facing it on the end face of the fastening bolt. The spindle has slots in the area of the bore, in the manner of a collet, so that the jaws of this clamping device can move in the radial direction. This radial movement is achieved in that the spindle is displaced axially in a hollow drive shaft by the displacement device and an outer cone provided in the slotted area of the spindle can slide onto an inner cone provided at a corresponding point on the drive shaft. So that a secure positive connection between the pin and the bore is achieved, the lateral surface of the pin and the wall of the bore have transverse grooves, so that they can engage with one another under radial pressure on the slotted spindle. In order to determine whether the fastening bolt has been pressed sufficiently far into the clamping point, a groove with a resilient locking element attached to it is provided on the outer surface of the fastening bolt. The resilient locking element snaps into a corresponding groove in the hollow drive shaft as soon as it has reached it. The fastening bolt is designed so that when this locking point is not reached, the fastening bolt is only loosely seated in the drive shaft, which makes it easy to see that it must be pressed in even deeper.

Weitere vorteilhafte Ausführungsformen dieser Variante sind Gegenstand der Unteransprüche 11 bis 19.Further advantageous embodiments of this variant are the subject of subclaims 11 to 19.

Damit jedoch, zum Beispiel bei einem Winkelschleifer mit Bremseinrichtung beim Abbremsen oder Anlaufen des Winkelschleifers das Werkzeug sich nicht von selber löst oder eine Schraubbefestigung festdreht, liegt einer weiteren Variante der Erfindung die Aufgabe zugrunde, eine Einrichtung zum lösbaren Einspannen eines Werkzeugs, insbesondere einer Schleifscheibe, eines handgeführten Winkelschleifers zu schaffen, bei welcher kein Hilfswerkzeug zum Lösen oder Anziehen der Einrichtung beim Einspannen des Werkzeugs benötigt wird, und die außerdem noch so ausgebildet ist, daß sich die Einspannung des Werkzeugs bei starken Beschleunigungskräften, d.h. z. B. beim Abbremsen der rotierenden Schleifscheibe, nicht löst.However, so that, for example, in an angle grinder with a braking device when the angle grinder brakes or starts up, the tool does not loosen itself or a screw fastening is tightened, the object of a further variant of the invention is to provide a device for releasably clamping a tool, in particular a grinding wheel, to create a hand-held angle grinder, in which no auxiliary tool for releasing or tightening the device when clamping the tool is required, and which is also designed so that the clamping of the tool with strong acceleration forces, ie e.g. B. does not solve when braking the rotating grinding wheel.

Diese Aufgabe wird bei einem tragbaren Winkelschleifer versehen mit einer Einrichtung zum Befestigen eines Werkzeugs, welche einen Motor, ein Winkelgetriebe und eine Einspannstelle für das Werkzeug, wobei das Winkelgetriebe im wesentlichen aus einem Motorritzel, einem Kegelrad und einer Antriebswelle besteht, umfassen, mit einer in einer Schleifspindel axial verschiebbaren Zugspindel, mit einer Verschiebeeinrichtung, durch welche die Zugspindel in Richtung des Werkzeugs verschiebbar ist, und mit einem werkzeugseitig an der Schleifspindel gehaltenen Gegenflansch, erfindungsgemäß dadurch gelöst, daß die Verschiebeeinrichtung in einer das Werkzeug spannenden und einer das Werkzeug freigebenden Stellung verharrend ausgebildet ist, daß in die Zugspindel werkzeugseitig und stirnseitig ein Bolzen einschraubbar ist, daß der Bolzen auf seinem der Zugspindel abgekehrten Ende mit einem Flansch versehen ist, daß mit dem Flansch über eine ebenfalls mit einem Flansch versehene Zwischenhülse das Werkzeug auf den Gegenflansch gedrückt ist, und daß die Hülse axial verschieblich und durch Formschluß drehfest in die hohle Schleifspindel eingreift.This object is provided in a portable angle grinder with a device for fastening a tool, which comprises a motor, an angular gear and a clamping point for the tool, the angular gear essentially consisting of a motor pinion, a bevel gear and a drive shaft, with an in a grinding spindle axially displaceable traction spindle, with a displacement device, by means of which the traction spindle can be displaced in the direction of the tool, and with a counter flange held on the tool side on the grinding spindle, solved according to the invention in that the displacement device remains in a position exciting the tool and in a position releasing the tool is designed that a bolt can be screwed into the tool spindle and the front side, that the bolt is provided with a flange on its end remote from the spindle, that with the flange via an intermediate sleeve which is also provided with a flange, the work Stuff is pressed onto the counter flange, and that the sleeve engages axially displaceably and non-rotatably in the hollow grinding spindle.

Diese Lösung sieht vor, daß auf die in der hohl ausgebildeten Antriebswelle axial verschiebbar gelagerte Spindel stirnseitig ein Bolzen eingeschraubt wird, der auf seinem der Spindel abgekehrten Ende mit einem Flansch versehen ist, mit dem er über eine ebenfalls mit einem Flansch versehene Zwischenhülse das Werkzeug auf den Gegenflansch der Antriebswelle drückt. Die Hülse ist auf der Außenfläche ihres zylindrischen Teils mit einer Verzahnung in axialer Richtung versehen. Durch diese axiale Bewegung der Spindel wird die Mutter, die das Werkzeug auf den Gegenflanschen drückt, vom Werkzeug abgehoben. Danach kann man leicht die mit einer Rändel versehene Mutter von der Spindel durch Drehen lösen. Ein Hilfswerkzeug zum Lösen der Mutter ist bei dieser Anordnung nicht nötig. Außerdem ist der Aufwand zur Herstellung der Verschiebeeinrichtung in etwa dem gleichzusetzen, wie er erbracht werden muß, um eine Spindelarretierung im Getriebegehäuse zu integrieren. Dadurch, daß man die Mutter beim Montieren und Lösen direkt mit der Hand anfaßt und nicht mit einem Hilfswerkzeug auf- oder abschraubt, kommt die Hand mit der Schneidkante nicht mehr in Berührung. Das verringert die Verletzungsgefahr durch das Werkzeug.This solution provides that a pin is inserted on the end face of the spindle which is axially displaceably mounted in the hollow drive shaft is screwed, which is provided on its end facing away from the spindle with a flange, with which he presses the tool on the counterflange of the drive shaft via an intermediate sleeve which is also provided with a flange. The sleeve is provided on the outer surface of its cylindrical part with teeth in the axial direction. This axial movement of the spindle lifts the nut, which presses the tool onto the counter flange, from the tool. Then you can easily loosen the knurled nut from the spindle by turning it. An auxiliary tool for loosening the nut is not necessary with this arrangement. In addition, the effort to manufacture the displacement device is roughly equivalent to what it has to be done to integrate a spindle lock in the gear housing. By touching the nut directly with the hand during assembly and loosening and not screwing it on or off with an auxiliary tool, the hand no longer comes into contact with the cutting edge. This reduces the risk of injury from the tool.

Weitere vorteilhafte Ausführungsformen sind Gegenstand der Unteransprüche 21 bis 31.Further advantageous embodiments are the subject of dependent claims 21 to 31.

Die Erfindung ist anhand von Zeichnungen näher erläutert.The invention is explained in more detail with reference to drawings.

Es zeigen:

  • Fig. 1 einen Längsschnitt durch einen Winkelschleifer, wobei der Motor nur angedeutet ist;
  • Fig. 2 einen Schnitt nach der Linie 11 - 11 in Fig. 1, der eine Variante darstellt;
  • Fig. 3 eine Variante nach Fig. 2;
  • Fig. 4 einen Schnitt nach der Linie IV - IV in Fig. 3, Fig. 5 einen Längsschnitt durch ein Winkelschleifergetriebe, mit Spannhülse
  • Fig. 6 einen Schnitt durch ein Getriebegehäuse eines Winkelschleifers, wobei die bekannten Getriebeelemente weggelassen wurden.
Show it:
  • Figure 1 shows a longitudinal section through an angle grinder, the motor is only indicated.
  • FIG. 2 shows a section along the line 11-11 in FIG. 1, which represents a variant;
  • 3 shows a variant according to FIG. 2;
  • Fig. 4 shows a section along the line IV - IV in Fig. 3, Fig. 5 shows a longitudinal section through an angle grinder gear, with adapter sleeve
  • Fig. 6 shows a section through a gear housing of an angle grinder, wherein the known gear elements have been omitted.

Der in Fig. 1 dargestellte Winkelschleifer zeigt im wesentlichen einen abgebrochen dargestellten Motor 14, ein daran anschließendes Getriebe 1 und ein Werkzeug 23. Über ein Ritzel 13 wird die Rotationsbewegung des Motors auf ein Kegelrad 15 übertragen, das drehfest mit einer Antriebswelle 16 verbunden ist. Gelagert ist die Antriebswelle 16 durch zwei Lager 3 und 17 an jeweils gegenüberliegenden Seiten im Getriebegehäuse 2. Am einen Ende der Antriebswelle 16 befindet sich eine von außerhalb des Getriebegehäuses 2 zu betätigende Verschiebeeinrichtung 6. Am anderen Ende ragt die Antriebswelle 16 so weit aus dem Getriebegehäuse 2 heraus, daß an ihrem Umfang ein Gegenflansch 22, der zur Befestigung des Werkzeugs 23 dient, starr mit ihr verbunden werden kann. Die Antriebswelle 16 ist zur Aufnahme einer Spindel 20 hohl ausgebildet. Die Spindel 20 ragt über die Stirnseiten der Antriebswelle 16 heraus. Auf der einen Seite, um mit der Verschiebeeinrichtung 6 zusammen zu wirken, auf der anderen mit einem Gewindezapfen 19, auf den eine Mutter 21 aufgeschraubt werden kann. Gegenflansch 22 und Mutter 21 bilden die Einspannstelle für das Werkzeug 23. Damit Antriebswelle 16 und Spindel 20 synchron laufen, ist die Spindel 16 über einen gewissen Bereich z. B. mit einer Zahnung 18 versehen. Die Zahnung 18 findet ihre Entsprechung in der Innenbohrung der Antriebswelle 16. Durch diese formschlüssige Verbindung wird erreicht, daß die Spindel 20 sich synchron zur Antriebswelle 16 dreht. Die Möglichkeit, daß die Spindel 20 in Achsrichtung relativ zur Antriebswelle 16 verschoben werden kann, bleibt erhalten.The angle grinder shown in FIG. 1 essentially shows a motor 14 shown broken off, a gear 1 connected to it and a tool 23. The rotational movement of the motor is transmitted via a pinion 13 to a bevel gear 15 which is connected in a rotationally fixed manner to a drive shaft 16. The drive shaft 16 is supported by two bearings 3 and 17 on opposite sides in the transmission housing 2. At one end of the drive shaft 16 there is a displacement device 6 to be actuated from outside the transmission housing 2. At the other end, the drive shaft 16 projects so far out of the transmission housing 2 out that on its periphery a counter flange 22, which serves to fasten the tool 23, can be rigidly connected to it. The drive shaft 16 is hollow for receiving a spindle 20. The spindle 20 protrudes over the end faces of the drive shaft 16. On the one hand, in order to cooperate with the displacement device 6, on the other with a threaded pin 19 onto which a nut 21 can be screwed. Counter flange 22 and nut 21 form the clamping point for the tool 23. So that the drive shaft 16 and spindle 20 run synchronously, the spindle 16 is z over a certain range. B. provided with teeth 18. The teeth 18 find their correspondence in the inner bore of the drive shaft 16. This positive connection ensures that the spindle 20 rotates synchronously with the drive shaft 16. The possibility that the spindle 20 can be moved in the axial direction relative to the drive shaft 16 remains.

Diese Verschiebung wird durch die Verschiebeeinrichtung 6 erzielt. Ein außerhalb des Getriebegehäuses 2 angeordneter Hebel 12 ist mit seinem zylinderförmigen Ansatz 9 in das Getriebegehäuse 2 eingeschraubt. Die Achse der Gewindebohrung im Getriebegehäuse 2 und die des zylinderförmigen Ansatzes 9 liegt in der Verlängerung der Achse der Spindel 20. Die Antriebswelle 16, die durch die beiden Lager 3 und 17 drehbar gelagert ist, ist auf ihrem über das Lager 3 hinausragenden Ende mit einer büchsenförmigen Abdeckung 11 versehen, die in ihrem Bodenteil 10 einen kreisrunden Durchbruch für die Spindel 20 aufweist. In dem verbleibenden Abstand zwischen Stirnfläche der Antriebswelle 16 und Bodenteil 10 der büchsenförmigen Abdeckung 11 ist eine Feder 4 angeordnet, die einen konzentrischen Ansatz 5 der Spindel 20 gegen das Bodenteil 10 drückt. Ein Endstück 7 der Spindel 20, das durch den Durchbruch im Bodenteil 10 ragt, reicht in eine Vertiefung 8 des zylinderförmigen Ansatzes 9.This displacement is achieved by the displacement device 6. A lever 12 arranged outside the transmission housing 2 is screwed into the transmission housing 2 with its cylindrical extension 9. The axis of the threaded bore in the gear housing 2 and that of the cylindrical extension 9 lies in the extension of the axis of the spindle 20. The drive shaft 16, which is rotatably supported by the two bearings 3 and 17, is on its end projecting beyond the bearing 3 with a provided sleeve-shaped cover 11, which has a circular opening for the spindle 20 in its bottom part 10. In the remaining distance between the end face of the drive shaft 16 and the bottom part 10 of the sleeve-shaped cover 11, a spring 4 is arranged, which presses a concentric extension 5 of the spindle 20 against the bottom part 10. An end piece 7 of the spindle 20, which projects through the opening in the base part 10, extends into a recess 8 of the cylindrical extension 9.

Wird der Hebel 12 um die Achse des zylinderförmigen Ansatzes 9 geschwenkt, so wird der zylinderförmige Ansatz 9 weiter in das Getriebegehäuse 2 ein- oder herausgeschraubt. Beim Einschrauben wird das Endstück 7 und somit die ganze Spindel 20 gegen die Kraft der Feder 4 axial verschoben. Diese axiale Verschiebung bewirkt, daß die Mutter 21 von der Seitenfläche des Werkzeugs 23 abgehoben wird. Da man nun zum Lösen der Mutter 21 nicht mehr die Anpreßkraft zwischen Mutter 21 und Werkzeug 23 überwinden muß, reicht es völlig aus, wenn man die, z. B. mit einer Rändel versehene, Mutter 21 von Hand von dem Gewindezapfen 19 abschraubt.If the lever 12 is pivoted about the axis of the cylindrical extension 9, the cylindrical extension 9 is screwed further into or out of the gear housing 2. When screwing in, the end piece 7 and thus the entire spindle 20 is axially displaced against the force of the spring 4. This axial displacement causes the nut 21 to be lifted off the side surface of the tool 23. Since you no longer have to overcome the contact pressure between the nut 21 and the tool 23 to loosen the nut 21, it is entirely sufficient if the z. B. provided with a knurled nut 21 by hand from the threaded pin 19.

Um das Werkzeug 23 zu montieren, wird es auf den Gegenflansch 22 aufgesteckt. Danach wird die Mutter 21 auf den Gewindezapfen 19 geschraubt, wobei es unerheblich ist, ob die Mutter 21 am Werkzeug 23 fest oder nur lose anliegt. Nach dem Anlaufen des Motors zieht sich die Mutter 21 auf den Gewindezapfen 19 von selbst fest.In order to assemble the tool 23, it is plugged onto the counter flange 22. Thereafter, the nut 21 is screwed onto the threaded pin 19, it being irrelevant whether the nut 21 is tight against the tool 23 or only loosely. After the motor has started, the nut 21 tightens itself on the threaded pin 19.

Für den Fall, daß versäumt wurde, den Hebel 12 in seine "Schließstellung" zurückzuschwenken, sind die einander zugekehrten Flächen auf dem Endstück 7 und der Vertiefung 8 so ausgebildet, daß beim Anlaufen der Maschine die Reibkraft zwischen den beiden Flächen ausreicht, um den Hebel 12 in die "Schließstellung" zu bringen.In the event that the lever 12 has not been pivoted back into its "closed position", the mutually facing surfaces on the end piece 7 and the depression 8 are designed in such a way that that when starting the machine, the frictional force between the two surfaces is sufficient to bring the lever 12 into the "closed position".

Es ist auch denkbar, daß statt des Hebels 12, bei entsprechender Wahl der Gewindesteigung am zylinderförmigen Ansatz 9, ein anderes Drehelement verwendet wird, z. B. ein Drehknopf mit den Raststellen "Schließen" und "Öffnen".It is also conceivable that instead of the lever 12, with a corresponding choice of the thread pitch on the cylindrical extension 9, another rotary element is used, for. B. a rotary knob with the locking points "close" and "open".

Die in den Fig. 2, 3 und 4 dargestellten Ausführungen sind Varianten der Verschiebeeinrichtung 6 nach Fig. 1, die bewirken, daß das Getriebegehäuse in seinen Abmessungen kleiner gehalten werden kann.The designs shown in FIGS. 2, 3 and 4 are variants of the displacement device 6 according to FIG. 1, which have the effect that the dimensions of the gear housing can be kept smaller.

In der Ausführung nach Fig. 2 wird die Spindel 20 über eine Verschiebeeinrichtung 25 axial verschoben. Die Verschiebeeinrichtung 25 besteht aus einem Schiebeknopf 27, der auf Schienen 29 im Getriebegehäuse 2 gleiten kann. Der Schiebeknopf 27 ragt mit einer Grifffläche 26 durch eine Öffnung 28 und über die Außenkontur des Getriebegehäuses 2 hinaus. Um beim Verschieben des Schiebeknopfes 27 das Eindringen von z. B. Staub in das Getriebegehäuse 2 zu verhindern, ist der Schiebeknopf 27 mit zwei jeweils über die Öffnung 28 sich erstreckenden Abdeckleisten 24 versehen. Der Schiebeknopf 27 weist auf seiner der Spindel 20 zugekehrten Seite eine schräge Fläche 30 auf. Beim Verschieben des Schiebeknopfes 27 von der einen Endstellung "Schließen" zu der anderen Endstellung "Öffnen" wird die schräge Fläche 30 über das Endstück 31 geschoben, so daß sich die Spindel 20 in Richtung Einspannstelle bewegt.2, the spindle 20 is axially displaced via a displacement device 25. The displacement device 25 consists of a slide button 27, which can slide on rails 29 in the gear housing 2. The sliding button 27 projects with a grip surface 26 through an opening 28 and beyond the outer contour of the transmission housing 2. To prevent the penetration of z. B. to prevent dust in the gear housing 2, the slide button 27 is provided with two cover strips 24 each extending over the opening 28. The sliding button 27 has an inclined surface 30 on its side facing the spindle 20. When sliding the push button 27 from one end position "closing" to the other end position "opening", the inclined surface 30 is pushed over the end piece 31 so that the spindle 20 moves in the direction of the clamping point.

In dem Ausführungsbeispiel nach Fig. 3 und 4 ist die Verschiebeeinrichtung 33 so angeordnet, daß sie z. B. beim Ablegen des Winkelschleifers nicht unbeabsichtigt verstellt wird. Dazu sind im Getriebegehäuse 2 Mulden 32 jeweils im Bereich des Zusammentreffens der beiden Seitenflächen und der dem Werkzeug 23 abgekehrten Seite des Getriebegehäuses 2 vorgesehen. Diese Mulden 32 haben Durchbrüche für eine quer zur Achse der Antriebswelle 16 bewegbare Schiebestange 35. Die Schiebestange 35 wird seitlich am Endstück 34 vorbeigeführt. Beim Verschieben der Schiebestange 35 drückt ein schräg auf der Schiebestange 35 montiertes Federelement 36 einen Wulst am Endstück 34 in Richtung Einspannstelle. Das schräg eingebaute Federelement 36 hat somit die gleiche Wirkung wie die schräge Fläche 30 nach dem Ausführungsbeispiel in Fig. 2. Wie Fig. 4 zeigt, kann das Endstück 34 sich auch dann drehen, wenn der Benützer vergessen hat, die Schiebestange 35 vor dem Einschalten des Motors in die Stellung "Schließen" zu bringen.In the embodiment of FIGS. 3 and 4, the displacement device 33 is arranged so that it z. B. is not inadvertently adjusted when putting down the angle grinder. For this purpose, 2 troughs 32 are provided in the gear housing in each case in the area of the meeting of the two side surfaces and the side of the gear housing 2 facing away from the tool 23. These troughs 32 have openings for a push rod 35 which can be moved transversely to the axis of the drive shaft 16. The push rod 35 is guided laterally past the end piece 34. When the push rod 35 is displaced, a spring element 36 mounted obliquely on the push rod 35 presses a bead on the end piece 34 in the direction of the clamping point. The inclined spring element 36 thus has the same effect as the inclined surface 30 according to the exemplary embodiment in FIG. 2. As shown in FIG. 4, the end piece 34 can also rotate if the user has forgotten the push rod 35 before switching on of the motor in the "close" position.

Mit diesen Anordnungen ist es möglich, einen äußerst einfachen Wechsel des Werkzeugs am Winkelschleifer zu erreichen. Durch die kompakte Bauweise wird das Getriebegehäuse in seinen Abmessungen kaum größer. Die Funktionssicherheit wird erhöht, denn der Motor kann eingeschaltet werden, ohne daß im Getriebegehäuse ein Teil blockiert ist.With these arrangements it is possible to achieve an extremely simple change of the tool on the angle grinder. Due to the compact design, the dimensions of the gearbox housing are hardly larger. Functional safety is increased because the motor can be switched on without any part being blocked in the gearbox.

Der in Fig. 5 dargestellte Winkelschleifer weist im wesentlichen einen Motor 7', ein Getriebe 1' und ein Werkzeug 21' auf. Die Rotationsbewegung des Motors 7' wird über ein Ritzel 6' auf ein Kegelrad 20' übertragen. Das Kegelrad 20' ist drehfest und axial unverschiebbar mit einer Antriebswelle 5' verbunden. Gelagert ist die Antriebswelle 5' in zwei Lagern, die im Gehäuse 2' des Getriebes 1' fixiert sind.The angle grinder shown in FIG. 5 essentially has a motor 7 ', a gear 1' and a tool 21 '. The rotational movement of the motor 7 'is transmitted to a bevel gear 20' via a pinion 6 '. The bevel gear 20 'is non-rotatably and axially immovably connected to a drive shaft 5'. The drive shaft 5 'is supported in two bearings which are fixed in the housing 2' of the transmission 1 '.

Mit einer Verschiebeeinrichtung 4' kann eine in der hohlen Antriebswelle 5' geführte Spindel 3' in Achsrichtung verschoben werden, wie dies für Fig. 1 beschrieben ist.With a displacement device 4 ', a spindle 3' guided in the hollow drive shaft 5 'can be displaced in the axial direction, as is described for FIG. 1.

Auf dem der Verschiebeeinrichtung 4' abgekehrten Ende der Antriebswelle 5' befindet sich ein aus dem Getriebegehäuse 2' herausragender Gegenflansch 19'. An diesem Gegenflansch 19' wird das Werkzeug 21' angelegt. Wenn das Werkzeug 21' an dem Gegenflansch 19' anliegt, kann ein Befestigungsbolzen 12' durch ein Aufnahmeloch im Werkzeug 21' in die hohle Antriebswelle 5' gesteckt werden. Der Befestigungsbolzen 12' weist auf seiner Stirnseite einen Zapfen 11' auf. Dieser Zapfen 11' gelangt gleichzeitig mit dem Einstecken des Befestigungsbolzens 12' in die Antriebswelle 5, in eine entsprechende Bohrung 10' der Spindel 3'. Die Spindel 3' ist im Bereich der Bohrung 10' mit Schlitzen 18' versehen. Die Schlitze 18' ermöglichen, daß das Ende der Spindel 3' in radialer Richtung gedrückt werden kann. Dieser Druck soll dann entstehen, wenn der Befestigungsbolzen 12' in die Antriebswelle 5' eingesteckt worden ist und der Zapfen 11' sich in der Bohrung 10' befindet. Dann wird die Verschiebeeinrichtung in Stellung "Schließen" gebracht und somit die Spindel 3' vom Werkzeug 21' wegbewegt. Durch einen Außenkonus 9' der Spindel 3' im Bereich der Schlitze 18' und einen entsprechenden Innenkonus 8' auf der Antriebswelle 5' wird dann der Zapfen 11' in der Bohrung 10' der Spindel 3' festgeklemmt. Um einen Formschluß zu erreichen, ist der Zapfen 11' auf seiner Mantelfläche und die Bohrung 10' an ihrer Wandung mit Quernuten versehen. Nach dem Festspannen des Zapfens 11' wird der ganze Befestigungsbolzen 12' in Richtung Verschiebeeinrichtung 4' gezogen und somit das Werkzeug 21' festgespannt. Damit zwischen Antriebswelle 5' und Befestigungsbolzen 12' bei der Rotation keine Relativbewegung entsteht, weisen beide Teile eine entsprechende Verzahnung 13' auf.On the end of the drive shaft 5 'facing away from the displacement device 4' there is a counter flange 19 'protruding from the gear housing 2'. The tool 21 'is placed on this counter flange 19'. When the tool 21 'abuts the counter flange 19', a fastening bolt 12 'can be inserted into the hollow drive shaft 5' through a receiving hole in the tool 21 '. The fastening bolt 12 'has a pin 11' on its end face. This pin 11 'arrives simultaneously with the insertion of the fastening bolt 12' into the drive shaft 5, into a corresponding bore 10 'of the spindle 3'. The spindle 3 'is provided with slots 18' in the region of the bore 10 '. The slots 18 'allow the end of the spindle 3' to be pressed in the radial direction. This pressure should arise when the fastening bolt 12 'has been inserted into the drive shaft 5' and the pin 11 'is in the bore 10'. Then the displacement device is brought into the "closing" position and thus the spindle 3 'is moved away from the tool 21'. The pin 11 'is then clamped in the bore 10' of the spindle 3 'by an outer cone 9' of the spindle 3 'in the region of the slots 18' and a corresponding inner cone 8 'on the drive shaft 5'. In order to achieve a positive connection, the pin 11 'is provided on its lateral surface and the bore 10' on its wall with transverse grooves. After the pin 11 'has been tightened, the entire fastening bolt 12' is pulled in the direction of the displacement device 4 'and the tool 21' is thus tightened. So that there is no relative movement between the drive shaft 5 'and the fastening bolt 12' during rotation, both parts have a corresponding toothing 13 '.

In einer umlaufenden Nut 14' des Befestigungsbolzens 12' ist ein federndes Rastelement 16' eingelegt. Erst wenn das federnde Rastelement 16' in eine Nut 17' der hohlen Antriebswelle 5' eingreift, ist der Punkt erreicht, an dem eine formschlüssige Verbindung zwischen Zapfen 11' und Spindel 3' hergestellt werden kann. Ansonsten sind die Toleranzen zwischen Befestigungsbolzen 12' und Antriebswelle 5' so gewählt, daß der Befestigungsbolzen 12' nur lose in der Antriebswelle 5' geführt ist.A resilient locking element 16 'is inserted in a circumferential groove 14' of the fastening bolt 12 '. Only when the resilient locking element 16 'engages in a groove 17' of the hollow drive shaft 5 'is the point reached at which a positive connection between the pin 11' and the spindle 3 'can be established. Otherwise, the tolerances between the fastening bolt 12 'and the drive shaft 5' are selected such that the fastening bolt 12 'is only loosely guided in the drive shaft 5'.

Der Getriebekopf 1" weist auf der einen Seite, eine aus dem Getriebegehäuse 2" herausragende Verschiebeeinrichtung 6" auf. Die Verschiebeeinrichtung 6" besteht im wesentlichen aus einem Betätigungselement 12" und einem Hubelement 9". Durch Drehen des Betätigungselements 12" wird das mit dem Betätigungselement 12" fest verbundene Hubelement 9" in oder aus dem, im Getriebegehäuse 2" vorgesehenen, Gewinde ein- oder ausgeschraubt. Das Ein- oder Ausschrauben geschieht in Achsrichtung einer im Getriebegehäuse 2" gelagerten Antriebswelle 16". In der hohl ausgebildeten Antriebswelle 16" ist eine Spindel 20" axial verschiebbar gelagert und kann, wie im erstgenannten Ausführungsbeispiel dargestellt, gegen die Kraft von Federelementen 4", durch die Verschiebeeinrichtung 6", in Achsrichtung verschoben werden. Die Antriebswelle 16" ist an ihrem einen Ende mit einer büchsenförmigen Abdeckung 11" versehen, die in ihrem Bodenteil 10" einen kreisrunden Durchbruch für die Spindel 20" aufweist. In dem verbleibenden Abstand zwischen Stirnfläche der Antriebswelle 16" und Bodenteil 10" der büchsenförmigen Abdeckung 11" sind die Federelemente 4" angeordnet, die einen konzentrischen Ansatz 5" der Spindel 20" gegen das Bodenteil 10" drückt. Ein Endstück 7" der Spindel 20", das durch den Durchbruch im Bodenteil 10" ragt, reicht in eine Vertiefung 8" des zylinderförmigen Ansatzes 9". Auf dem der Verschiebeeinrichtung 6" abgekehrten Ende der Antriebswelle 16" ist an der Antriebswelle 16" ein Gegenflansch 22" vorgesehen. An diesem Gegenflansch 22" liegt ein Werkzeug 23" an. Durch einen Absatz am Gegenflansch 22" ist das Werkzeug 23" zentriert. Das Werkzeug 23" wird durch einen Flansch 57" eines Bolzens 56" mittelbar durch den Flansch 53" einer Hülse 54" an den Gegenflansch 22" gedrückt. Die Anpreßkraft wird dadurch erzeugt, daß der Bolzen 56" durch den zylindrischen Teil 55" der Hülse 54" gesteckt wird und mit seinem, mit einem Gewinde versehenen, Vorderteil in ein entsprechendes Innengewinde der Spindel 20" eingeschraubt wird und, nach dem Einschrauben des Bolzens 56", das Betätigungselement 12" der Verschiebeeinrichtung 6" in Stellung "Schließen" gebracht wird. Dadurch wird eine zum Einsatz des Werkzeugs 23" ausreichende Anpreßkraft erreicht.The gear head 1 "has, on one side, a displacement device 6" protruding from the transmission housing 2 ". The displacement device 6" consists essentially of an actuating element 12 "and a lifting element 9". By turning the actuating element 12 ", the lifting element 9" firmly connected to the actuating element 12 "is screwed in or out of the thread provided in the gear housing 2". The screwing or unscrewing takes place in the axial direction of a drive shaft 16 "mounted in the transmission housing 2". A spindle 20 "is axially displaceably mounted in the hollow drive shaft 16" and, as shown in the first-mentioned exemplary embodiment, can be displaced in the axial direction against the force of spring elements 4 "by the displacement device 6". The drive shaft 16 "is provided at one end with a sleeve-shaped cover 11", which has a circular opening for the spindle 20 "in its bottom part 10". In the remaining distance between the end face of the drive shaft 16 ″ and the base part 10 ″ of the sleeve-shaped cover 11 ″, the spring elements 4 ″ are arranged which press a concentric shoulder 5 ″ of the spindle 20 ″ against the base part 10 ″. An end piece 7 ″ of the spindle 20 ", which protrudes through the opening in the bottom part 10", extends into a recess 8 "of the cylindrical extension 9". On the end of the drive shaft 16 "facing away from the displacement device 6", a counter flange 22 "is provided on the drive shaft 16". A tool 23 "bears against this counter flange 22". The tool 23 "is centered by a shoulder on the counter flange 22". The tool 23 "is pressed against the counter flange 22" by a flange 57 "of a bolt 56" indirectly through the flange 53 "of a sleeve 54". The contact pressure is generated in that the bolt 56 "is inserted through the cylindrical part 55" of the sleeve 54 "and with its threaded front part is screwed into a corresponding internal thread of the spindle 20" and, after screwing in the bolt 56 ", the actuating element 12" of the displacement device 6 "is brought into the" closing "position. This achieves a sufficient contact pressure for the use of the tool 23".

Die hohle Antriebswelle 16" weist im Bereich des Gegenflansches 22" eine erweiterte Bohrung auf. Die Wandung der erweiterten Bohrung ist mit Längsnuten 51" versehen. In die Längsnuten 51" kann die entsprechende Verzahnung 52" an der Mantelfläche des zylindrischen Teils 55" der Hülse 54" eingeschoben werden. Das gewährleistet eine formschlüssige Übertragung der Drehbewegung der Antriebswelle 16" auf die Hülse 54".The hollow drive shaft 16 ″ has an enlarged bore in the area of the counter flange 22 ″. The wall of the enlarged bore is provided with longitudinal grooves 51 ". The corresponding toothing 52" on the lateral surface of the cylindrical part 55 "of the sleeve 54" can be inserted into the longitudinal grooves 51 ". This ensures a positive transmission of the rotary movement of the drive shaft 16" the sleeve 54 ".

Damit beim zwangsweisen Abbremsen der Antriebswelle 16" der Bolzen 56" nicht aus dem Gewinde der Spindel 20" herausgedreht wird, sind die Flansche 53" und 57" auf den einander zugekehrten Flächen mit in radialer Richtung angeordneten Verzahnungen 58" und 50" versehen. Durch diese Verzahnungen 58" und 50" wird erreicht, daß auch der Bolzen 56" die Drehbewegung der Antriebswelle 16" mit durchführt, solange das Betätigungselement 12" in der Stellung "Schließen" verharrt. Eine kranzförmige Anordnung der Verzahnungen 58" und 50" auf den einander zugekehrten Flächen der Flansche 53" und 57" gewährleistet, daß die Anpreßkraft durch den Flansch 57" auch nachfedern kann.So that when the drive shaft 16 "is braked, the bolt 56" is not unscrewed from the thread of the spindle 20 ", the flanges 53" and 57 "are provided on the mutually facing surfaces with teeth 58" and 50 "arranged in the radial direction this toothing 58 "and 50" is achieved that the bolt 56 "also carries out the rotary movement of the drive shaft 16" as long as the actuating element 12 "remains in the" closing "position. A ring-shaped arrangement of the teeth 58 "and 50" on the mutually facing surfaces of the flanges 53 "and 57" ensures that the contact pressure can also spring back through the flange 57 ".

Damit man den Bolzen 56" bequem aus der Spindel 20" ausschrauben kann, empfiehlt es sich, die Randbereiche des Flansches 57" so zu gestalten, daß sie mit der Hand gut zu greifen sind. Das kann man zum Beispiel dadurch erreichen, daß man sie mit einer Rändel versieht und/oder mit einem weichelastischen Material überzieht.So that the bolt 56 "can be easily unscrewed from the spindle 20", it is advisable to design the edge regions of the flange 57 "in such a way that they can be easily gripped by hand knurled and / or covered with a soft elastic material.

Zum Abnehmen des Werkzeugs 23" muß das Betätigungselement 12" in die Stellung "Öffnen" gebracht werden, wodurch die Verschiebeeinrichtung 6" die Spindel 20" gegen die Kraft der Federelemente 4" verschiebt. Diese Hubbewegung ist ausreichend, um die am Flansch 57" des Bolzens 56" angeordneten Zähne 50" mit den Zähnen 58" des Flansches 53" der Hülse 54" außer Eingriff zu bringen. Danach kann der Bolzen 56" aus der Spindel 20" herausgeschraubt, die Hülse 54" aus der Antriebswelle 16" herausgezogen und das Werkzeug 23" gewechselt werden.In order to remove the tool 23 ", the actuating element 12" must be brought into the "open" position, as a result of which the displacement device 6 "displaces the spindle 20" against the force of the spring elements 4 ". This stroke movement is sufficient to move the flange 57" of the Disengage bolt 56 "arranged teeth 50" from teeth 58 "of flange 53" of sleeve 54 ". Then bolt 56" can be unscrewed from spindle 20 ", sleeve 54" pulled out of drive shaft 16 "and that Tool 23 "can be changed.

Claims (31)

1. A portable angle grinder provided with a device for securing a tools comprising a motor, a mitre gear and a fixing point for the tool, the mitre gear essentially comprising a motor pinion, a bevel gear and a drive shaft, with a hollow grinding wheel spindle, which on the side facing the tool supports a counter flange with a draw spindle which can be displaced inside said grinding wheel spindle against the force of spring elements in an axial direction towards the tool and with a hand-operated displacement device, by means of which an end part of the draw spindle can be acted upon from outside of a gear housing and the draw spindle can thereby be displaced in the direction of the tool, characterised
- in that the displacement device is designed so as to remain in a position fixing the tool and in a position releasing the tool and comprises an operating element, and a displacement element, which is connected with the operating element and which is provided with an inclined surface extending transversely relative to the axial direction of the grinding wheel spindle, the displacement element acting via the inclined surface upon the end part when the displacement device is actuated,
- in that the draw spindle is provided on the side facing the tool with a threaded journal, onto which a nut car be screwed manually in the position releasing the tool,
- and in that the tool can be secured between the counter flange and the nut.
2. A device according, to claim 1, characterised in that the draw spindle is rotationally rigidly held in the grinding wheel spindle.
3. A device according to claim 2, characterised in that the draw. spindte is provided with a toothing, which finds its counterpart in the hollow grinding wheel spindle.
4. A device according to one of the preceding claims, characterised in that the spring elements are arranged between an end face of the grinding wheel spindle and a shoulder of the draw spindle.
5. A device according to one of the preceding claims, characterised in that a lifting movement of the spring elements is limited by a bushing-shaped cover secured on the grinding wheel spindle.
6. A device according to one of the preceding claims, characterised in that the displacement element is a cylindrical extension of the displacement device, in that the inclined surface of the displacement element is a thread, by means of which the cylindrical extension can be screwed into or unscrewed from a threaded bore in the gear housing, as a result of which the cylindrical extension acts upon the end part of the draw spindle.
7. A device according to claim 6, characterised in that the cylindrical extension is arranged coaxial to the grinding wheel spindle.
8. A device according to one of claims 1 to 5, characterised in that the operating element is a sliding knob, which is displaceable in a guide of the gear housing and in that, on its side projecting into the gear housing, the sliding knob bears the displacement element with the inclined surface.
9. A device according to one of claims 1 to 5, characterised in that hollows are provided in the corners between lateral surfaces and a surface of the gear housing lying opposite the tool, which hollows comprise an opening for receiving a push rod designed as an operating element, and in that in its centre and on a side facing the end part, the push rod comprises a spring designed as a displacement element, which bears the inclined surface, which is itself arranged inclined relative to the direction of displacement of the push rod.
10. A portable angle grinder provided with a device for fixing a tool comprising a motor, a mitre gear and a fixing point for the tool, the mitre gear essentially comprising a motor pinion, a bevel gear and a drive shaft, with a hollow grinding wheel spindle, which supports a counter flange with a draw spindle, which is axially displaceable in the grinding wheel spindle and with a displacement device for the draw spindle, characterised
- in that the displacement device is designed so as to remain in a position fixing the tool and in a position releasing the tool,
- in that the draw spindle arranged in the hollow grinding wheel spindle is provided at its end facing away from the displacement device with a gripper device which can be actuated by the displacement of the draw spindle,
- and in that the tool can be secured between a flange, which can be gripped of the gripper device and the counter flange.
11. A device according to claim 10, characterised in that the gripper device is designed such that the draw spindle is slotted in the manner of a collet and is provided in the slotted region on the outer surface with a cone.
12. A device according to claim 11, characterised in that in the region of the cone of the draw spindle, the grinding wheel spindle comprises a corresponding inner cone.
13. A device according to claim 12, characterised in that the draw spindle is provided on an end face of its slotted end with a bore.
14. A device according to claim 13, characterised in that the bore comprises on its wall a form-locking shape, e.g. transverse slots.
15. A device according to one of the preceding claims 10 to 14, characterised in that a securing bolt comprising the flange can be releasably connected with the draw spindle by means of the gripper device.
16. A device according to claim 15, characterised in that the securing bolt is provided on its side facing the gripper device with a journal which on its outer surface comprises a form-locking shape, e.g. transverse slots, corresponding to the wall or the bore.
17. A device according to claim 15 or 16, characterised in that the securing bolt is provided with a circumferential groove, which is used to receive a resilient locking element.
18. A device according to one of claims 10 to 17, characterised in that the draw spindle is displaceable within the grinding wheel spindle against the force of a spring element in the direction of the tool.
19. A device according to one of claims 10 to 18, characterised in that by means of the displacement device, an end part of the draw spindle can be acted upon from outside the gear housing and the draw spindle can thereby be displaced in the direction of the tool and in that the displacement device comprises an operating element and a displacement element, which is connected with the operating element, is provided with an inclined surface extending transversely relative to the axial direction of the grinding wheel spindle and acts upon the end part via the inclined surface when the displacement device is actuated.
20. A portable angle grinder provided with a device for securing a tool comprising a motor, a mitre gear and a fixing point for the tool, the mitre gear essentially comprising a motor pinion, a bevel gear and a drive shaft, with a draw spindle, which is axially displaceable in a grinding wheel spindle, with a displacement device by means of which the draw spindle can be displaced in the direction of the tool and with a counter flange held on the grinding wheel spindle on the side facing the tool,
characterised
- in that the displacement device is designed so as to remain in a position securing the tool and in a position releasing the tool,
- in that a bolt can be screwed into the draw spindle at the side facing the tool and at the end face,
- in that the bolt is provided on its end facing away from the draw spindle with a flange,
- in that the tool is pressed onto the counter flange by means of the flange via an intermediate sleeve, which is also provided with a flange,
- and in that the sleeve is axially displaceable and engages in a rotationally rigid manner by form-locking in the hollow grinding wheel spindle.
21. A device according to claim 20, characterised in that the sleeve is provided in the cylindrical region on its outer surface with a form-locking shape, preferably a toothing in an axial direction.
22. A device according to one of claims 20 or 21, characterised in that a toothing is provided between the flanges and in that the depth of the toothing is less than one displacement stroke of the draw spindle.
23. A device according to claim 22, characterised in that the toothing between the flanges extends over a partial area of the radial extension of said flanges.
24. A device according to one of claims 20 to 23, characterised in that the bolt is provided at the edge of the flange with a structure increasing the gripping capacity.
25. A device according to one of claims 20 to 24, characterised in that the bolt is provided at the end facing away from the flange with a thread.
26. A device according to one of claims 20 to 25, characterised in that the draw spindle is displaceable relative to the grinding wheel spindle against the force of spring elements in the direction of the tool.
27. A device according to claim 26, characterised in that the spring elements are arranged between an end face of the grinding wheel spindle and a shoulder of the draw spindle.
28. A device according to claim 27, characterised in that a lifting movement of the spring elements is limited by a bushing-shaped cover.
29. A device according to one of claims 20 to 28, characterised in that by means of the displacement device, an end part of the draw spindle can be acted upon from outside the gear housing.
30. A device according to claim 29, characterised in that the displacement device comprises an operating element, which acts upon the end part via a displacement element provided with an inclined surface which extends transversely to the axial direction of the grinding wheel spindle.
31. A device according to one of claims 20 to 30, characterised in that the draw spindle is rotationally rigidly held in the grinding wheel spindle.
EP19840114612 1984-02-18 1984-12-01 Tool mounting Expired EP0152564B1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE19843405885 DE3405885C1 (en) 1984-02-18 1984-02-18 Device for fastening a grinding wheel on the grinding spindle of a portable angle grinder
DE3405885 1984-02-18
DE19843414148 DE3414148A1 (en) 1984-04-14 1984-04-14 Tool-fastening means
DE3414148 1984-04-14
DE3431901 1984-08-30
DE19843431901 DE3431901A1 (en) 1984-08-30 1984-08-30 Tool-fastening means with intermediate sleeve

Publications (3)

Publication Number Publication Date
EP0152564A2 EP0152564A2 (en) 1985-08-28
EP0152564A3 EP0152564A3 (en) 1986-12-30
EP0152564B1 true EP0152564B1 (en) 1989-08-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840114612 Expired EP0152564B1 (en) 1984-02-18 1984-12-01 Tool mounting

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US (2) US4597227A (en)
EP (1) EP0152564B1 (en)

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Also Published As

Publication number Publication date
USRE33335E (en) 1990-09-18
EP0152564A3 (en) 1986-12-30
EP0152564A2 (en) 1985-08-28
US4597227A (en) 1986-07-01

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