EP0521259B1 - Portable power tool - Google Patents

Portable power tool Download PDF

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Publication number
EP0521259B1
EP0521259B1 EP92107613A EP92107613A EP0521259B1 EP 0521259 B1 EP0521259 B1 EP 0521259B1 EP 92107613 A EP92107613 A EP 92107613A EP 92107613 A EP92107613 A EP 92107613A EP 0521259 B1 EP0521259 B1 EP 0521259B1
Authority
EP
European Patent Office
Prior art keywords
clamping
machine tool
tool according
fork
securing element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92107613A
Other languages
German (de)
French (fr)
Other versions
EP0521259A1 (en
Inventor
Hans Hermann Rottmerhusen
Boris Rudolf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
C&E Fein GmbH and Co
Original Assignee
C&E Fein GmbH and Co
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.)
Filing date
Publication date
Priority claimed from DE19914122320 external-priority patent/DE4122320A1/en
Priority claimed from DE19914134072 external-priority patent/DE4134072A1/en
Application filed by C&E Fein GmbH and Co filed Critical C&E Fein GmbH and Co
Publication of EP0521259A1 publication Critical patent/EP0521259A1/en
Application granted granted Critical
Publication of EP0521259B1 publication Critical patent/EP0521259B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F3/00—Associations of tools for different working operations with one portable power-drive means; Adapters 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

Definitions

  • the invention relates to a portable machine tool, in particular an angle grinder, with a motor for driving a tool via an angular gear, with a hollow spindle, at one end of which the tool can be fastened between two flanges, with a clamping bolt, via which the tool can be clamped in a rotationally fixed manner, and with a securing element for the rotationally fixed securing of the tool with a manually operable clamping device which can be moved against the force of at least one elastic element between a clamping position in which the tool is clamped in the axial direction and a release position in which the tool is relieved for manual change , and wherein the elastic element is arranged between an axial fixed stop and an axially displaceable stop.
  • An angle grinder of this type is known from DE 34 05 885 C1, in which the grinding tool can be clamped in a rotationally fixed manner by means of a quick-action clamping device without the aid of an additional tool.
  • the known angle grinder is driven by a motor via an angular gear, by which a grinding spindle is driven.
  • a clamping bolt is arranged axially displaceably within the grinding spindle, which is designed as a hollow spindle, and the grinding wheel is received between two flanges at the grinding wheel end.
  • the clamping bolt can be moved axially between a clamping position and a release position against the force of spring elements via a manually operable clamping device. In the release position, the clamping bolt is axially displaced in the direction of the grinding wheel. This relieves the pressure on the outer flange, which is screwed onto a threaded pin of the clamping bolt on the grinding wheel side, so that it can be unscrewed from the threaded pin for changing the grinding wheel without the aid
  • the clamping device After changing the grinding wheel and after manually screwing the outer flange onto the threaded pin, the clamping device is brought into the clamping position by turning the clamping lever. As a result, the clamping bolt is axially displaced so that the grinding wheel is clamped in a rotationally fixed manner between the two flanges under the action of the spring elements.
  • the grinding tool is fixed on the tool side by screwing the outer flange onto the threaded pin.
  • the operator can slip easily, which can result in injuries to the sharp grinding wheel.
  • the invention is therefore based on the object of providing a portable machine tool in which the clamping of various tools is readily possible without additional aids and in which the risk of injury is reduced.
  • this object is achieved in a portable hand tool of the type mentioned in that the securing element is provided on the side of the clamping bolt facing away from the tool, and in that the securing element is acted upon by the displaceable stop in the clamping position in order to rotate the tool to secure.
  • any tools can be clamped between the two flanges without the use of an additional tool. It is also possible to use cranked tools, brush tools, etc., since the tool is only frictionally clamped between two flanges, the outer flange being provided on the tool-side end of the clamping bolt.
  • the securing element is positively secured in the clamping position.
  • the displaceable stop is sleeve-shaped and arranged coaxially on the hollow spindle.
  • the spring elements which are supported on one side on the fixed stop, are enclosed by the sleeve-shaped, displaceable stop on the other side, so that the seat of the spring elements is defined at the same time.
  • the securing element can be designed as a clamping nut which can be screwed onto a thread of the clamping bolt.
  • the clamping nut can be screwed onto the thread without the aid of a tool, whereupon the clamping device is brought into the clamping position, whereby the tool is clamped in a rotationally fixed manner.
  • the clamping device is brought back into the release position.
  • the clamping nut can now be unscrewed from the thread of the clamping bolt and the clamping bolt can be pulled out of the hollow spindle so that the tool can be removed.
  • the clamping bolt is put through its central opening again and fastened at its other end by screwing on the clamping nut. Then the Bring the clamping device into the clamping position, whereby the tool is clamped in a rotationally fixed manner between the two flanges and at the same time the clamping nut is positively secured in the clamping position.
  • the form-fitting securing can be achieved in a simple manner in that the displaceable stop and the securing element have a spur toothing, whereby the securing element is positively secured when it rests on the displaceable stop.
  • the securing element can be positively secured to the clamping bolt by means of a bayonet catch.
  • the bayonet lock can be locked in various axial positions.
  • the axial locking positions are expediently matched to the different tool thicknesses specified by standardization.
  • bayonet pitch grooves are provided on the clamping bolt, which are connected for locking by a locking pin via an axial groove.
  • the securing element can be designed in a simple manner as a knurled knob, from which the locking pin protrudes radially.
  • the tensioning device has a tension fork which is rotatably mounted about a fixed axis of rotation and which acts with its free fork ends on the displaceable stop for axial displacement.
  • the displaceable stop which is preferably arranged coaxially on the hollow spindle, can be axially displaced in a simple manner by rotating the clamping fork.
  • the clamping device can have a clamping fork which is rotatably mounted on its two fork ends on a fixed axis of rotation and acts with its central region on the displaceable stop for axial displacement.
  • relief of the securing element is achieved when the common end of the clamping fork opposite the two fork ends is displaced in the direction of the tool.
  • the relief of the securing element takes place in the aforementioned embodiment when the common end of the tension fork is moved in the opposite direction.
  • rolling elements for reducing friction are provided on the contact surface between the clamping fork and the displaceable stop.
  • a clamping lever can be provided, by means of which the common end of the clamping fork facing away from the axis of rotation can be displaced in the axial direction.
  • the clamping lever can have a long lever end for actuation, which is rotatably mounted on the housing via a pin and is connected to a short lever end, via which the common end of the clamping fork can be displaced when the clamping lever is actuated.
  • the clamping lever is rotatably attached to the housing via an eccentric, which acts on the common end of the clamping fork via an axially movable pressure piece for axial displacement.
  • the clamping fork is additionally lifted from the displaceable stop by a spring in the clamping position.
  • the clamping lever in the second embodiment can be stored outside the housing, since the clamping lever is actuated by the eccentric of the clamping lever via the axially displaceable pressure piece becomes.
  • the storage of the tension lever outside the housing has the advantage that sealing problems when sealing the gearbox to the outside are reduced.
  • the sealing of the transmission housing to the outside is improved in that a seal is arranged between the fixed stop and the housing.
  • the clamping device is expediently designed so that the axial displacement path between the clamping position and the release position is at least so large that when the frictional connection between the tool and the flanges in the release position is removed, the stroke of the form-fitting securing of the securing element can also be overcome.
  • the positive locking preferably has a stroke that is as short as possible, for which purpose a fine ribbing can be provided, for example, in the case of a spur toothing, for example a 64 division.
  • the clamping lever can be locked with its free end on the housing in the clamping position.
  • This measure has the advantage that accidental actuation or release of the tensioning lever is reliably avoided.
  • the free end of the tensioning lever is designed to protrude outward from the housing.
  • This measure has the advantage that the tensioning lever can be better gripped at its free end in the tensioning position in which the tensioning lever is folded against the housing.
  • the clamping device ensures a non-rotatable clamping of the tool in the clamping position via friction.
  • a positive locking of the clamping bolt on the hollow spindle can be provided.
  • clamping bolt has a polygonal section, e.g. in the form of a triangle, which engages positively in the flange at the outer end of the hollow spindle.
  • FIGS. 1 and 2 As the first embodiment of a machine tool according to the invention, an angle grinder is shown in FIGS. 1 and 2, which is designated overall by the number 10.
  • a hollow spindle 14 is rotatably connected to the driven gear 15 of an angular gear which is driven by an electric motor.
  • a tool 12 which is designed as a grinding wheel, is clamped between two flanges 16, 18. While the inner, machine-side flange 18 is molded onto the end of the hollow spindle 14, the outer flange 16 is formed at the end of a clamping bolt 22 which is inserted through a central opening 17 of the tool 12.
  • the hollow spindle is supported by means of two ball bearings 56, 58, which are arranged on both sides of the driven wheel 15 of the angular gear.
  • the clamping bolt 22 has at its end facing away from the tool a thread 32 which projects outwards from the hollow spindle 14 and onto which a securing element 20 in the form of a clamping nut can be screwed.
  • a fixed stop 28 in the form of an annular flange is arranged on the hollow spindle 14 and bears against the inner ring of the ball bearing 56, which faces away from the tool 12.
  • a sleeve-shaped displaceable stop 30 is also arranged on the hollow spindle 14.
  • Spring elements 26 are located between the displaceable stop 30 and the fixed stop 28 held, which are designed as disc springs and which are enclosed on the outside by the movable stop 30. The spring force is about 1000 - 5000 N.
  • the displaceable stop 30 can be displaced in the axial direction with the aid of a clamping device 24 via a clamping fork 34 which can be actuated via a clamping lever 38.
  • the sleeve-shaped stop 30 has an outer annular shoulder 31 against which two free fork ends 36 of the clamping fork 34 can be pressed.
  • the clamping fork 34 has an approximately U-shaped basic shape and is rotatably mounted on the housing 42 via two lateral pins 41.
  • the two fork ends 36 are connected via a cross piece 35, from the center of which a common fork end 37 projects, by means of which the clamping fork 34 can be pivoted about the two lateral pins 41.
  • the pins 41 are arranged offset from the fork ends 36 in the direction of the common fork end 37, the fork ends 36 protrude outward from the axis of rotation fixed by the pins 41. If the pivot fork is removed from the tool at its common end 37, this therefore leads to a pivoting of the fork ends 36 in the direction of the annular shoulder 31 of the displaceable stop 30.
  • the tensioning lever 38 is pivotably mounted with a long lever end 46 in a recess in the housing 42 by means of a pin 48. From the pin 48, the clamping lever 38 is extended via a short lever end 44, on which a roller 50 is provided, which abuts the common end 37 of the clamping fork 34.
  • the tensioning lever 38 projects laterally from the housing 42 with a cranked section 43 of its long lever end 46 and, after a short straight section, merges into an approximately trapezoidal section 45, which covers the clamping bolt 22 with the screwed-on securing element 20 from the outside in the clamping position shown.
  • the trapezoidal section 45 finally merges again into a straight section, on which the clamping lever 38 is locked on the housing 42 by means of a catch 52.
  • the clamping lever end 54 is bent laterally outwards from the housing 42 in order to make it easy to grip.
  • the displaceable stop 30 protrudes somewhat outwards from the housing surface, so that the securing element 20 screwed onto the thread 32 rests directly on the annular surface of the displaceable stop 30 and is thus acted upon by the force of the spring elements 26.
  • the two mutually facing surfaces of the securing element 20 and the displaceable stop 30 have end teeth 21, by means of which the securing element 20 is positively secured to the displaceable stop 30.
  • the clamping bolt 22 has a polygonal section in the form of a triangle with three circular segments 25 on its outer grinding wheel-side area, which are each connected via straight sections 27.
  • the polygonal section 19 engages in a form-fitting manner in a correspondingly shaped recess on the flange 18 of the hollow spindle 14.
  • the polygonal section 19 is followed by a cylindrical section 23 of the clamping bolt 22, which engages in the opening 17 of the tool 12 and to which the flange 16 is connected.
  • the tensioning lever 38 is gripped at its end 54 and pivoted away from the housing 42 to overcome the force of the locking means 52.
  • This moves the short Lever end 44 with its roller 50 in a direction opposite the tool 12, whereby the two fork ends 36 are pressed onto the annular shoulder 31 and the displaceable stop 30 is thus displaced in the direction of the tool 12.
  • the positive connection between the securing element 20 and the displaceable stop 30 is released and the securing element is relieved of the force of the spring elements 26, so that the nut can be unscrewed from the thread 32 of the clamping bolt 22 without the aid of a tool.
  • clamping bolt 22 can be pulled out of the hollow spindle 14 so that the tool 12 can be removed.
  • a new tool 12 is secured after inserting the clamping bolt 22 through its central opening 17 and then secured in a rotationally fixed manner in the reverse manner after the clamping nut has been screwed on.
  • a seal 57 is arranged between the fixed stop 28 and the housing seat of the ball bearing 56.
  • a rolling element 39 in the form of a roller is embedded in each fork end 36, as a result of which the friction is considerably reduced and thus seizing due to incorrect operation is prevented.
  • FIGS. 4 and 5 A slightly modified embodiment is shown in FIGS. 4 and 5.
  • a hollow spindle 64 is supported by means of two ball bearings 106, 108 and driven via the driven gear 65 of an angular gear.
  • a grinding tool 62 is held in a corresponding manner between a flange 68 at the outer end of the hollow spindle 64 and a flange 66 of a clamping bolt 72 inserted into the hollow spindle 64.
  • the clamping bolt 72 is secured in a corresponding manner with the aid of a polygonal section 69 on the flange 68 of the hollow spindle 64.
  • the polygonal section 69 of the clamping bolt 64 is followed by a cylindrical section 73, which is closed off by the flange 66.
  • the clamping bolt 72 protrudes outward from the housing 92 with its end facing away from the tool 62 and is fixed at its end via a bayonet catch 82 with a securing element 70.
  • a fixed stop 78 is arranged on the hollow spindle 64, to which a displaceable stop 80 is assigned. Between the fixed stop 78 and the displaceable stop 80, spring elements 76 are provided, by means of which the sleeve-shaped, displaceable stop 80 is urged outwards against the securing element 70.
  • the securing element 70 is thus acted upon in a direction opposite to the tool 62, as a result of which the tool 62 is clamped in a rotationally fixed manner between the two flanges 66 and 68.
  • a clamping device 74 is also provided, through which the displaceable stop 80 by shifting a clamping lever 88 in the direction of the tool 62 is displaceable, whereby the securing element 70 is relieved of the force of the spring elements 76 so that it can be released from the end of the clamping bolt 72 and the clamping bolt 72 from the opening 67 of the tool 62nd can be pulled out.
  • a bayonet lock 82 is provided instead of a clamping nut in the embodiment according to FIG. 3.
  • the securing element 70 is designed as a simple knurled knob on which a radial locking pin 79 is arranged.
  • an axial groove 83 is provided, from which a plurality of oblique pitch grooves 85 extend.
  • the securing element 70 can be inserted in the release position from the end of the clamping bolt 72 through the axial groove 83 with its locking pin 79 and can be latched laterally into one of the pitch grooves 85. If a tool of a different thickness is to be fastened, the locking pin 79 can be locked in another pitch groove 85.
  • the locking pin 79 is held at the end of a slope groove 85, so that the securing element is secured in this position.
  • the clamping device 74 has a clamping fork 84 with a U-shaped basic shape, the two fork ends 86 of which are connected via a central web 96, from which a common fork end 87 protrudes.
  • the clamping fork 84 can be pivoted about an axis of rotation 90 fixed to the device by actuating the common fork end 87.
  • the tensioning fork 84 is supported on its two fork ends 86 on the housing 92 by means of laterally projecting pins 91.
  • the axis of rotation of the Tensioning fork 84 thus runs through the two fork ends 86.
  • rolling elements 89 are arranged in the form of rollers to reduce friction.
  • the contact surface between the annular shoulder 81 of the displaceable stop 80 and the clamping fork 84 is thus formed by the rolling elements 89 in the central region 93 of the clamping fork.
  • the tensioning lever 88 is pivotally mounted outside the housing 92 by means of a pin 98. At this end, the tensioning lever 88 is designed as an eccentric 95, which bears against a pressure piece 97 which is axially displaceable in the housing 92. The end of the pressure piece 97 lies against the common end 87 of the clamping fork 84. The tensioning fork 84 is urged against the pressure piece 97 by a spring 99, so that the tensioning fork 84 is lifted off the displaceable stop 80 in the tensioned position shown.
  • the tensioning lever 88 extends from the eccentric 95 with an approximately trapezoidal section 94 over the end of the tensioning bolt 72, and the securing element 70 and lies with its end with a flat section on the housing 92, from which a bent section 104 extends outwards protrudes.
  • the locking pin 79 of the securing element 70 is relieved of load, so that the locking pin 79 is moved through the gradient groove 85 to the axial groove 83 of the bayonet catch 82 can and can be pulled out through the axial groove 83 from the clamping bolt 72.
  • the tool 62 can now be changed in a known manner by pulling out the clamping bolt 72.

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

Description

Die Erfindung betrifft eine tragbare Werkzeugmaschine, insbesondere Winkelschleifgerät, mit einem Motor zum Antrieb eines Werkzeugs über ein Winkelgetriebe, mit einer Hohlspindel, an deren einem Ende das Werkzeug zwischen zwei Flanschen befestigbar ist, mit einem Spannbolzen, über welchen das Werkzeug drehfest einspannbar ist, und mit einem Sicherungselement zur drehfesten Sicherung des Werkzeuges mit einer handbetätigbaren Spanneinrichtung, welche gegen die Kraft mindestens eines elastischen Elementes zwischen einer Spannstellung, in welcher das Werkzeug in Axialrichtung gespannt ist, und einer Lösestellung, in welcher das Werkzeug zum manuellen Wechsel entlastet ist, bewegbar ist, und wobei das elastische Element zwischen einem axialen Festanschlag und einem axial verschiebbaren Anschlag angeordnet sind.The invention relates to a portable machine tool, in particular an angle grinder, with a motor for driving a tool via an angular gear, with a hollow spindle, at one end of which the tool can be fastened between two flanges, with a clamping bolt, via which the tool can be clamped in a rotationally fixed manner, and with a securing element for the rotationally fixed securing of the tool with a manually operable clamping device which can be moved against the force of at least one elastic element between a clamping position in which the tool is clamped in the axial direction and a release position in which the tool is relieved for manual change , and wherein the elastic element is arranged between an axial fixed stop and an axially displaceable stop.

Aus der DE 34 05 885 C1 ist ein Winkelschleifgerät dieser Art bekannt, bei welchem das Schleifwerkzeug mittels einer Schnellspanneinrichtung ohne Zuhilfenahme eines zusätzlichen Werkzeuges drehfest einspannbar ist. Das bekannte Winkelschleifgerät ist von einem Motor über ein Winkelgetriebe angetrieben, von dem eine Schleifspindel angetrieben ist. Innerhalb der Schleifspindel, die als Hohlspindel ausgebildet ist, ist ein Spannbolzen axial verschiebbar angeordnet, an dessen schleifscheibenseitigem Ende die Schleifscheibe zwischen zwei Flanschen aufgenommen ist. Der Spannbolzen ist gegen die Kraft von Federelementen über eine handbetätigbare Spanneinrichtung axial zwischen einer Spannstellung und einer Lösestellung verschiebbar. In der Lösestellung ist der Spannbolzen in Richtung auf die Schleifscheibe axial verschoben. Dadurch ist der äußere Flansch, der auf einen schleifscheibenseitigen Gewindezapfen des Spannbolzens aufgeschraubt ist, entlastet, so daß dieser ohne Zuhilfenahme eines Werkzeuges vom Gewindezapfen zum Wechsel der Schleifscheibe abgeschraubt werden kann.An angle grinder of this type is known from DE 34 05 885 C1, in which the grinding tool can be clamped in a rotationally fixed manner by means of a quick-action clamping device without the aid of an additional tool. The known angle grinder is driven by a motor via an angular gear, by which a grinding spindle is driven. A clamping bolt is arranged axially displaceably within the grinding spindle, which is designed as a hollow spindle, and the grinding wheel is received between two flanges at the grinding wheel end. The clamping bolt can be moved axially between a clamping position and a release position against the force of spring elements via a manually operable clamping device. In the release position, the clamping bolt is axially displaced in the direction of the grinding wheel. This relieves the pressure on the outer flange, which is screwed onto a threaded pin of the clamping bolt on the grinding wheel side, so that it can be unscrewed from the threaded pin for changing the grinding wheel without the aid of a tool.

Nach dem Wechsel der Schleifscheibe und nach dem manuellen Aufschrauben des äußeren Flansches auf den Gewindezapfen wird die Spanneinrichtung durch Verdrehen des Spannhebels in die Spannstellung gebracht. Hierdurch wird der Spannbolzen axial verschoben, so daß die Schleifscheibe unter der Wirkung der Federelemente zwischen den beiden Flanschen reibschlüssig drehfest eingespannt wird.After changing the grinding wheel and after manually screwing the outer flange onto the threaded pin, the clamping device is brought into the clamping position by turning the clamping lever. As a result, the clamping bolt is axially displaced so that the grinding wheel is clamped in a rotationally fixed manner between the two flanges under the action of the spring elements.

Bei der vorbekannten Anordnung hat es sich als nachteilig erwiesen, daß das Schleifwerkzeug werkzeugseitig durch Aufschrauben des äußeren Flansches auf den Gewindezapfen fixiert wird. Hierbei kann der Bediener leicht abrutschen, was Verletzungen an der scharfen Schleifscheibe zur Folge haben kann.In the known arrangement, it has proven to be disadvantageous that the grinding tool is fixed on the tool side by screwing the outer flange onto the threaded pin. The operator can slip easily, which can result in injuries to the sharp grinding wheel.

Darüber hinaus ist die vorbekannte Anordnung nur zum Einspannen bestimmter Werkzeuge geeignet. Abgekröpfte Werkzeuge, Stahldrahtbürsten, Schleiftöpfe und sonstige Spezialwerkzeuge können nicht ohne weiteres befestigt werden; hierzu sind spezielle Hilfswerkzeuge oder Adapter notwendig.In addition, the previously known arrangement is only suitable for clamping certain tools. Cranked tools, steel wire brushes, cup wheels and other special tools cannot be easily attached; special auxiliary tools or adapters are required for this.

Der Erfindung liegt demnach die Aufgabe zugrunde, eine tragbare Werkzeugmaschine zu schaffen, bei welcher die Einspannung verschiedener Werkzeuge ohne zusätzliche Hilfsmittel ohne weiteres möglich ist und bei welcher die Verletzungsgefahr verringert wird.The invention is therefore based on the object of providing a portable machine tool in which the clamping of various tools is readily possible without additional aids and in which the risk of injury is reduced.

Gemäß der vorliegenden Erfindung wird diese Aufgabe bei einer tragbaren Handwerkzeugmaschine der eingangs genannten Art dadurch gelöst, daß das Sicherungselement auf der dem Werkzeug abgewandten Seite des Spannbolzens vorgesehen ist, und daß das Sicherungselement in der Spannstellung durch den verschiebbaren Anschlag beaufschlagt ist, um das Werkzeug drehfest zu sichern.According to the present invention, this object is achieved in a portable hand tool of the type mentioned in that the securing element is provided on the side of the clamping bolt facing away from the tool, and in that the securing element is acted upon by the displaceable stop in the clamping position in order to rotate the tool to secure.

Auf diese Weise können beliebige Werkzeuge zwischen den beiden Flanschen ohne Zuhilfenahme eines Zusatzwerkzeuges gespannt werden. Dabei ist auch die Verwendung von gekröpften Werkzeugen, Bürstenwerkzeugen usw. möglich, da das Werkzeug lediglich zwischen zwei Flanschen reibschlüssig eingespannt wird, wobei der äußere Flansch am werkzeugseitigen Ende des Spannbolzens vorgesehen ist.In this way, any tools can be clamped between the two flanges without the use of an additional tool. It is also possible to use cranked tools, brush tools, etc., since the tool is only frictionally clamped between two flanges, the outer flange being provided on the tool-side end of the clamping bolt.

Da der Spannbolzen lediglich durch die zentrale Öffnung des Werkzeuges hindurchgesteckt werden muß und im übrigen keinerlei Manipulation an der Werkzeugseite erforderlich ist, wird das Verletzungsrisiko erheblich reduziert.Since the clamping bolt only has to be inserted through the central opening of the tool and no manipulation on the tool side is required, the risk of injury is considerably reduced.

In weiterer Ausgestaltung der Erfindung ist das Sicherungselement in der Spannstellung formschlüssig gesichert.In a further embodiment of the invention, the securing element is positively secured in the clamping position.

Da Schleifscheiben grundsätzlich ein gewisses Spiel aufweisen und während des Schleifbetriebes Vibrationen auftreten, könnte sich eine einfache Verschraubung lösen. Durch eine formschlüssige Sicherung wird eine sichere Befestigung des Werkzeuges bei allen Anwendungsfällen und selbst bei Fehlbedienung sichergestellt.Since grinding wheels generally have a certain amount of play and vibrations occur during grinding operation, a simple screw connection could come loose. A form-fit securing ensures that the tool is securely attached in all applications and even in the event of incorrect operation.

Bei einer weiteren Ausgestaltung der Erfindung ist der verschiebbare Anschlag büchsenförmig ausgebildet und koaxial auf der Hohlspindel angeordnet.In a further embodiment of the invention, the displaceable stop is sleeve-shaped and arranged coaxially on the hollow spindle.

Bei dieser Ausführung sind die Federelemente, die auf einer Seite an dem Festanschlag abgestützt sind, von dem büchsenförmigen, verschiebbaren Anschlag auf der anderen Seite umschlossen, so daß gleichzeitig der Sitz der Federelemente festgelegt ist.In this embodiment, the spring elements, which are supported on one side on the fixed stop, are enclosed by the sleeve-shaped, displaceable stop on the other side, so that the seat of the spring elements is defined at the same time.

Das Sicherungselement kann als Spannmutter ausgebildet sein, die auf ein Gewinde des Spannbolzens aufschraubbar ist.The securing element can be designed as a clamping nut which can be screwed onto a thread of the clamping bolt.

Nachdem die Spanneinrichtung in die Lösestellung gebracht ist, kann die Spannmutter ohne Zuhilfenahme eines Werkzeuges auf das Gewinde aufgeschraubt werden, woraufhin die Spanneinrichtung in die Spannstellung gebracht wird, wodurch das Werkzeug drehfest eingespannt wird. Zum Wechsel des Werkzeuges wird die Spanneinrichtung wieder in die Lösestellung gebracht. Die Spannmutter kann nun vom Gewinde des Spannbolzens abgeschraubt werden und der Spannbolzen aus der Hohlspindel herausgezogen werden, so daß das Werkzeug abgenommen werden kann. Nach Aufsetzen eines neuen Werkzeuges wird der Spannbolzen wieder durch dessen zentrale Öffnung hindurchgesteckt und an seinem anderen Ende durch Aufschrauben der Spannmutter befestigt. Anschließend wird die Spanneinrichtung in die Spannstellung gebracht, wodurch das Werkzeug zwischen den beiden Flanschen drehfest eingespannt wird und gleichzeitig die Spannmutter formschlüssig in der Spannstellung gesichert ist.After the clamping device is brought into the release position, the clamping nut can be screwed onto the thread without the aid of a tool, whereupon the clamping device is brought into the clamping position, whereby the tool is clamped in a rotationally fixed manner. To change the tool, the clamping device is brought back into the release position. The clamping nut can now be unscrewed from the thread of the clamping bolt and the clamping bolt can be pulled out of the hollow spindle so that the tool can be removed. After putting on a new tool, the clamping bolt is put through its central opening again and fastened at its other end by screwing on the clamping nut. Then the Bring the clamping device into the clamping position, whereby the tool is clamped in a rotationally fixed manner between the two flanges and at the same time the clamping nut is positively secured in the clamping position.

Die formschlüssige Sicherung kann auf einfache Weise dadurch erreicht werden, daß der verschiebbare Anschlag und das Sicherungselement eine Stirnverzahnung aufweisen, wodurch das Sicherungselement bei Anlage auf dem verschiebbaren Anschlag formschlüssig gesichert ist.The form-fitting securing can be achieved in a simple manner in that the displaceable stop and the securing element have a spur toothing, whereby the securing element is positively secured when it rests on the displaceable stop.

In alternativer Weise kann das Sicherungselement an dem Spannbolzen über einen Bajonettverschluß formschlüssig gesichert werden.Alternatively, the securing element can be positively secured to the clamping bolt by means of a bayonet catch.

Hierbei ergibt sich der besondere Vorteil, daß auf einfache Weise das Sicherungselement am Spannbolzen festgelegt werden kann, wobei gleichzeitig die formschlüssige Sicherung erreicht wird.This has the particular advantage that the securing element can be fixed to the clamping bolt in a simple manner, with positive locking being achieved at the same time.

In vorteilhafter Weiterbildung ist der Bajonettverschluß in verschiedenen axialen Positionen verrastbar.In an advantageous development, the bayonet lock can be locked in various axial positions.

Hierdurch ist es möglich, Werkzeuge verschiedener Stärke auf einfache Weise zu sichern. Die axialen Rastpositionen sind hierbei zweckmäßigerweise auf die verschiedenen, durch Normung vorgegebenen Werkzeugstärken abgestimmt.This makes it possible to easily secure tools of different strengths. The axial locking positions are expediently matched to the different tool thicknesses specified by standardization.

In zweckmäßiger Ausgestaltung sind am Spannbolzen Bajonettsteigungsrillen vorgesehen, welche zur Verrastung mit einem Arretierstift über eine Axialnut verbunden sind. Hierbei kann das Sicherungselement in einfacher Weise als Rändelknopf ausgebildet sein, aus dem der Arretierstift radial hervorsteht.In an expedient embodiment, bayonet pitch grooves are provided on the clamping bolt, which are connected for locking by a locking pin via an axial groove. Here, the securing element can be designed in a simple manner as a knurled knob, from which the locking pin protrudes radially.

In vorteilhafter Weiterbildung weist die Spanneinrichtung eine um eine feste Drehachse drehbar gelagerte Spanngabel auf, welche mit ihren freien Gabelenden zur axialen Verschiebung auf den verschiebbaren Anschlag einwirkt.In an advantageous further development, the tensioning device has a tension fork which is rotatably mounted about a fixed axis of rotation and which acts with its free fork ends on the displaceable stop for axial displacement.

Bei dieser Ausführung kann der verschiebbare Anschlag, der vorzugsweise koaxial auf der Hohlspindel angeordnet ist, durch Verdrehen der Spanngabel auf einfache Weise axial verschoben werden.In this embodiment, the displaceable stop, which is preferably arranged coaxially on the hollow spindle, can be axially displaced in a simple manner by rotating the clamping fork.

In alternativer Ausführung kann die Spanneinrichtung eine Spanngabel aufweisen, welche an ihren beiden Gabelenden an einer festen Drehachse drehbar gelagert ist und mit ihrem mittleren Bereich zur axialen Verschiebung auf den verschiebbaren Anschlag einwirkt. Bei dieser Ausführung wird eine Entlastung des Sicherungselementes dann erreicht, wenn das den beiden Gabelenden gegenüberliegende gemeinsame Ende der Spanngabel in Richtung auf das Werkzeug verschoben wird. Dagegen erfolgt die Entlastung des Sicherungselementes bei der vorgenannten Ausführung dann, wenn das gemeinsame Ende der Spanngabel in entgegengesetzter Richtung verschoben wird.In an alternative embodiment, the clamping device can have a clamping fork which is rotatably mounted on its two fork ends on a fixed axis of rotation and acts with its central region on the displaceable stop for axial displacement. In this embodiment, relief of the securing element is achieved when the common end of the clamping fork opposite the two fork ends is displaced in the direction of the tool. In contrast, the relief of the securing element takes place in the aforementioned embodiment when the common end of the tension fork is moved in the opposite direction.

Da Fehlbedienungen grundsätzlich nicht auszuschließen sind, muß damit gerechnet werden, daß die Maschine eingeschaltet wird, obwohl sich die Spanneinrichtung noch in der Lösestellung befindet. In diesem Falle drückt die Spanngabel auf den verschiebbaren Anschlag. Beim Einschalten des Antriebes wäre ein Festfressen der Spanngabel auf dem verschiebbaren Anschlag die Folge.Since incorrect operation cannot be ruled out, it must be expected that the machine will be switched on, even though the clamping device is still in the release position. In this case, the clamping fork presses on the sliding stop. When the drive is switched on, the clamping fork would seize on the movable stop.

Um dies zu vermeiden, sind in vorteilhafter Weiterbildung an der Kontaktfläche zwischen Spanngabel und verschiebbarem Anschlag Wälzelemente zur Reibungsverminderung vorgesehen.In order to avoid this, in an advantageous further development, rolling elements for reducing friction are provided on the contact surface between the clamping fork and the displaceable stop.

Zur Betätigung der Spanngabel kann ein Spannhebel vorgesehen sein, über welchen das gemeinsame, der Drehachse abgewandte Ende der Spanngabel in Axialrichtung verschiebbar ist.To actuate the clamping fork, a clamping lever can be provided, by means of which the common end of the clamping fork facing away from the axis of rotation can be displaced in the axial direction.

Durch Umlegen des Spannhebels läßt sich so auf einfache Weise eine Verschiebung des verstellbaren Anschlages zwischen Spannstellung und Lösestellung erreichen.By moving the clamping lever, a displacement of the adjustable stop between the clamping position and the release position can be achieved in a simple manner.

Bei einer ersten Ausführung kann hierzu der Spannhebel ein langes Hebelende zur Betätigung aufweisen, welches über einen Stift am Gehäuse drehbar gelagert ist und mit einem kurzen Hebelende verbunden ist, über welches das gemeinsame Ende der Spanngabel bei Betätigung des Spannhebels verschiebbar ist.In a first embodiment, the clamping lever can have a long lever end for actuation, which is rotatably mounted on the housing via a pin and is connected to a short lever end, via which the common end of the clamping fork can be displaced when the clamping lever is actuated.

Bei einer alternativen Ausführung ist der Spannhebel am Gehäuse über einen Exzenter drehbar festgelegt, welcher über ein axial bewegliches Druckstück auf das gemeinsame Ende der Spanngabel zur axialen Verschiebung einwirkt.In an alternative embodiment, the clamping lever is rotatably attached to the housing via an eccentric, which acts on the common end of the clamping fork via an axially movable pressure piece for axial displacement.

In vorteilhafter Weiterbildung wird hierbei zusätzlich die Spanngabel in der Spannstellung durch eine Feder vom verschiebbaren Anschlag abgehoben.In an advantageous further development, the clamping fork is additionally lifted from the displaceable stop by a spring in the clamping position.

Während bei der erstgenannten Ausführung der Spannhebel innerhalb des Gehäuses gelagert sein muß, um mit seinem kurzen Hebelende auf die Spanngabel einzuwirken, kann der Spannhebel bei der zweiten Ausführung außerhalb des Gehäuses gelagert werden, da der Spannhebel über das axial verschiebliche Druckstück vom Exzenter des Spannhebels betätigt wird.While in the first-mentioned embodiment the clamping lever must be mounted within the housing in order to act on the clamping fork with its short lever end, the clamping lever in the second embodiment can be stored outside the housing, since the clamping lever is actuated by the eccentric of the clamping lever via the axially displaceable pressure piece becomes.

Die Lagerung des Spannhebels außerhalb des Gehäuses hat den Vorteil, daß Dichtungsprobleme bei der Abdichtung des Getriebes nach außen reduziert werden.The storage of the tension lever outside the housing has the advantage that sealing problems when sealing the gearbox to the outside are reduced.

In vorteilhafter Weiterbildung wird die Abdichtung des Getriebegehäuses nach außen dadurch verbessert, daß zwischen dem Festanschlag und dem Gehäuse eine Dichtung angeordnet ist.In an advantageous development, the sealing of the transmission housing to the outside is improved in that a seal is arranged between the fixed stop and the housing.

Die Spanneinrichtung ist zweckmäßigerweise so ausgelegt, daß der axiale Verschiebeweg zwischen der Spannstellung und der Lösestellung mindestens so groß ist, daß bei Aufhebung des Reibschlusses zwischen dem Werkzeug und den Flanschen in der Lösestellung auch der Hub der formschlüssigen Sicherung des Sicherungselementes überwindbar ist.The clamping device is expediently designed so that the axial displacement path between the clamping position and the release position is at least so large that when the frictional connection between the tool and the flanges in the release position is removed, the stroke of the form-fitting securing of the securing element can also be overcome.

Da der insgesamt erforderliche Hub durch eine zusätzliche formschlüssige Sicherung des Sicherungselementes vergrößert wird, weist die formschlüssige Sicherung vorzugsweise einen möglichst geringen Hub auf, wozu beispielsweise im Falle der Verwendung einer Stirnverzahnung eine feine Verrippung vorgesehen werden kann, zum Beispiel eine 64er-Teilung.Since the overall required stroke is increased by an additional positive locking of the securing element, the positive locking preferably has a stroke that is as short as possible, for which purpose a fine ribbing can be provided, for example, in the case of a spur toothing, for example a 64 division.

In vorteilhafter Weiterbildung ist der Spannhebel mit seinem freien Ende am Gehäuse in der Spannstellung verrastbar.In an advantageous development, the clamping lever can be locked with its free end on the housing in the clamping position.

Diese Maßnahme hat den Vorteil, daß ein versehentliches Betätigen oder Lösen des Spannhebels sicher vermieden wird.This measure has the advantage that accidental actuation or release of the tensioning lever is reliably avoided.

Bei einer weiteren Ausgestaltung der Erfindung ist das freie Ende des Spannhebels nach außen vom Gehäuse abstehend ausgebildet.In a further embodiment of the invention, the free end of the tensioning lever is designed to protrude outward from the housing.

Diese Maßnahme hat den Vorteil, daß sich der Spannhebel in der Spannstellung, in welcher der Spannhebel an das Gehäuse angeklappt ist, besser an seinem freien Ende ergreifen läßt.This measure has the advantage that the tensioning lever can be better gripped at its free end in the tensioning position in which the tensioning lever is folded against the housing.

Durch die Spanneinrichtung ist eine drehfeste Einspannung des Werkzeuges in der Spannstellung über Reibschluß gewährleistet.The clamping device ensures a non-rotatable clamping of the tool in the clamping position via friction.

In zusätzlicher Weiterbildung kann eine formschlüssige Sicherung des Spannbolzens an der Hohlspindel vorgesehen sein.In an additional development, a positive locking of the clamping bolt on the hollow spindle can be provided.

Hierdurch ist eine drehfeste Verbindung zwischen der Hohlspindel und dem Spannbolzen gewährleistet.This ensures a rotationally fixed connection between the hollow spindle and the clamping bolt.

Dies kann auf einfache Weise dadurch erreicht sein, daß der Spannbolzen einen Mehrkantabschnitt, z.B. in Form eines Dreikants, aufweist, der formschlüssig in den Flansch am äußeren Ende der Hohlspindel eingreift.This can be achieved in a simple manner in that the clamping bolt has a polygonal section, e.g. in the form of a triangle, which engages positively in the flange at the outer end of the hollow spindle.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
einen Längsschnitt durch den vorderen Bereich einer erfindungsgemäßen Werkzeugmaschine in schematischer Darstellung;
Fig. 2
eine Ansicht des Spannbolzens mit verschiebbarem Anschlag und Spanngabel gemäß Fig. 1 von oben nach Abnahme des Sicherungselementes;
Fig. 3
einen Schnitt längs der Linie III-III gemäß Fig. 1;
Fig. 4
einen Längsschnitt einer erfindungsgemäßen Werkzeugmaschine in einer gegenüber Fig. 1 leicht abgewandelten Ausführung und
Fig. 5
eine Ansicht des Spannbolzens gemäß Fig. 3 mit verschiebbarem Anschlag und Spanngabel von oben nach Abnahme des Sicherungselementes.
Exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the following description. Show it:
Fig. 1
a longitudinal section through the front region of a machine tool according to the invention in a schematic representation;
Fig. 2
a view of the clamping bolt with a movable stop and clamping fork according to Figure 1 from above after removal of the securing element.
Fig. 3
a section along the line III-III of FIG. 1;
Fig. 4
a longitudinal section of a machine tool according to the invention in a slightly modified embodiment compared to FIG. 1 and
Fig. 5
a view of the clamping bolt according to FIG. 3 with a movable stop and clamping fork from above after removal of the securing element.

Als erstes Ausführungsbeispiel einer erfindungsgemäßen Werkzeugmaschine ist in den Figuren 1 und 2 ein Winkelschleifgerät dargestellt, das insgesamt mit der Ziffer 10 bezeichnet ist.As the first embodiment of a machine tool according to the invention, an angle grinder is shown in FIGS. 1 and 2, which is designated overall by the number 10.

Eine Hohlspindel 14 ist mit dem Abtriebsrad 15 eines Winkelgetriebes drehfest verbunden, welches von einem Elektromotor angetrieben ist.A hollow spindle 14 is rotatably connected to the driven gear 15 of an angular gear which is driven by an electric motor.

Ein Werkzeug 12, welches als Schleifscheibe ausgebildet ist, ist zwischen zwei Flanschen 16, 18 eingespannt. Während der innere, maschinenseitige Flansch 18 an das Ende der Hohlspindel 14 angeformt ist, ist der äußere Flansch 16 am Ende eines Spannbolzens 22 ausgebildet, der durch eine zentrale Öffnung 17 des Werkzeuges 12 hindurchgesteckt ist.A tool 12, which is designed as a grinding wheel, is clamped between two flanges 16, 18. While the inner, machine-side flange 18 is molded onto the end of the hollow spindle 14, the outer flange 16 is formed at the end of a clamping bolt 22 which is inserted through a central opening 17 of the tool 12.

Die Hohlspindel ist mittels zweier Kugellager 56, 58, die beidseitig des Abtriebsrades 15 des Winkelgetriebes angeordnet sind, gelagert.The hollow spindle is supported by means of two ball bearings 56, 58, which are arranged on both sides of the driven wheel 15 of the angular gear.

Der Spannbolzen 22 weist an seinem dem Werkzeug abgewandten Ende ein Gewinde 32 auf, das aus der Hohlspindel 14 nach außen hervorsteht, und auf das ein Sicherungselement 20 in Form einer Spannmutter aufschraubbar ist.The clamping bolt 22 has at its end facing away from the tool a thread 32 which projects outwards from the hollow spindle 14 and onto which a securing element 20 in the form of a clamping nut can be screwed.

Auf der Hohlspindel 14 ist ein Festanschlag 28 in Form eines Ringflansches angeordnet, welcher an dem Innenring des Kugellagers 56, welches dem Werkzeug 12 abgewandt ist, anliegt. Auf der Hohlspindel 14 ist ferner ein büchsenförmig ausgebildeter verschiebbarer Anschlag 30 angeordnet. Zwischen dem verschiebbaren Anschlag 30 und dem Festanschlag 28 sind Federelemente 26 gehalten, die als Tellerfedern ausgebildet sind und die außen von dem verschiebbaren Anschlag 30 umschlossen werden. Die Federkraft beträgt etwa 1000 - 5000 N.A fixed stop 28 in the form of an annular flange is arranged on the hollow spindle 14 and bears against the inner ring of the ball bearing 56, which faces away from the tool 12. A sleeve-shaped displaceable stop 30 is also arranged on the hollow spindle 14. Spring elements 26 are located between the displaceable stop 30 and the fixed stop 28 held, which are designed as disc springs and which are enclosed on the outside by the movable stop 30. The spring force is about 1000 - 5000 N.

Der verschiebbare Anschlag 30 ist mit Hilfe einer Spanneinrichtung 24 über eine Spanngabel 34, welche über einen Spannhebel 38 betätigbar ist, in Axialrichtung verschiebbar. Der büchsenförmige Anschlag 30 weist eine äußere Ringschulter 31 auf, gegen die zwei freie Gabelenden 36 der Spanngabel 34 anpreßbar sind.The displaceable stop 30 can be displaced in the axial direction with the aid of a clamping device 24 via a clamping fork 34 which can be actuated via a clamping lever 38. The sleeve-shaped stop 30 has an outer annular shoulder 31 against which two free fork ends 36 of the clamping fork 34 can be pressed.

Die Spanngabel 34 weist eine etwa U-förmige Grundform auf und ist über zwei seitliche Stifte 41 drehbar am Gehäuse 42 gelagert. Die beiden Gabelenden 36 sind über einen Quersteg 35 verbunden, von dessen Mitte ein gemeinsames Gabelende 37 absteht, über welches die Spanngabel 34 um die beiden seitlichen Stifte 41 verschwenkt werden kann.The clamping fork 34 has an approximately U-shaped basic shape and is rotatably mounted on the housing 42 via two lateral pins 41. The two fork ends 36 are connected via a cross piece 35, from the center of which a common fork end 37 projects, by means of which the clamping fork 34 can be pivoted about the two lateral pins 41.

Da die Stifte 41 von den Gabelenden 36 in Richtung auf das gemeinsame Gabelende 37 hin versetzt angeordnet sind, stehen die Gabelenden 36 von der durch die Stifte 41 festgelegten gerätefesten Drehachse nach außen hervor. Wird die Schwenkgabel an ihrem gemeinsamen Ende 37 vom Werkzeug entfernt, so führt dies daher zu einer Verschwenkung der Gabelenden 36 in Richtung auf die Ringschulter 31 des verschiebbaren Anschlages 30.Since the pins 41 are arranged offset from the fork ends 36 in the direction of the common fork end 37, the fork ends 36 protrude outward from the axis of rotation fixed by the pins 41. If the pivot fork is removed from the tool at its common end 37, this therefore leads to a pivoting of the fork ends 36 in the direction of the annular shoulder 31 of the displaceable stop 30.

Der Spannhebel 38 ist mit einem langen Hebelende 46 in einer Ausnehmung des Gehäuses 42 mittels eines Stiftes 48 verschwenkbar gelagert. Vom Stift 48 aus ist der Spannhebel 38 über ein kurzes Hebelende 44 verlängert, an welchem eine Rolle 50 vorgesehen ist, welche an dem gemeinsamen Ende 37 der Spanngabel 34 anliegt.The tensioning lever 38 is pivotably mounted with a long lever end 46 in a recess in the housing 42 by means of a pin 48. From the pin 48, the clamping lever 38 is extended via a short lever end 44, on which a roller 50 is provided, which abuts the common end 37 of the clamping fork 34.

In der gezeichneten Spannstellung steht der Spannhebel 38 mit einem gekröpften Abschnitt 43 seines langen Hebelendes 46 seitlich aus dem Gehäuse 42 hervor und geht nach einem kurzen geraden Abschnitt in einen etwa trapezförmigen Abschnitt 45 über, welcher den Spannbolzen 22 mit dem aufgeschraubten Sicherungselement 20 in der gezeigten Spannstellung von außen überdeckt. Der trapezförmige Abschnitt 45 geht schließlich wieder in einen geraden Abschnitt über, an welchem der Spannhebel 38 mittels einer Raste 52 am Gehäuse 42 arretiert ist. Das Spannhebelende 54 ist seitlich nach außen vom Gehäuse 42 abgebogen, um ein einfaches Ergreifen zu ermöglichen.In the tensioned position shown, the tensioning lever 38 projects laterally from the housing 42 with a cranked section 43 of its long lever end 46 and, after a short straight section, merges into an approximately trapezoidal section 45, which covers the clamping bolt 22 with the screwed-on securing element 20 from the outside in the clamping position shown. The trapezoidal section 45 finally merges again into a straight section, on which the clamping lever 38 is locked on the housing 42 by means of a catch 52. The clamping lever end 54 is bent laterally outwards from the housing 42 in order to make it easy to grip.

In der gezeigten Spannstellung steht der verschiebbare Anschlag 30 aus der Gehäuseoberfläche etwas nach außen hervor, so daß das auf das Gewinde 32 aufgeschraubte Sicherungselement 20 unmittelbar auf der Ringfläche des verschiebbaren Anschlages 30 anliegt und somit durch die Kraft der Federelemente 26 beaufschlagt ist.In the clamping position shown, the displaceable stop 30 protrudes somewhat outwards from the housing surface, so that the securing element 20 screwed onto the thread 32 rests directly on the annular surface of the displaceable stop 30 and is thus acted upon by the force of the spring elements 26.

Die beiden einander zugewandten Flächen des Sicherungselementes 20 und des verschiebbaren Anschlages 30 weisen eine Stirnverzahnung 21 auf, durch welche das Sicherungselement 20 an dem verschiebbaren Anschlag 30 formschlüssig gesichert ist.The two mutually facing surfaces of the securing element 20 and the displaceable stop 30 have end teeth 21, by means of which the securing element 20 is positively secured to the displaceable stop 30.

Der Spannbolzen 22 weist gemäß den Figuren 1 und 3 an seinem äußeren schleifscheibenseitigen Bereich einen Mehrkantabschnitt in Form eines Dreikants mit drei Kreissegmenten 25 auf, welche jeweils über gerade Abschnitte 27 verbunden sind. Der Mehrkantabschnitt 19 greift formschlüssig in eine entsprechend geformte Ausnehmung am Flansch 18 der Hohlspindel 14 ein. An den Mehrkantabschnitt 19 schließt sich ein zylindrischer Abschnitt 23 des Spannbolzens 22 an, welcher in die Öffnung 17 des Werkzeugs 12 eingreift und an welchen sich der Flansch 16 anschließt.According to FIGS. 1 and 3, the clamping bolt 22 has a polygonal section in the form of a triangle with three circular segments 25 on its outer grinding wheel-side area, which are each connected via straight sections 27. The polygonal section 19 engages in a form-fitting manner in a correspondingly shaped recess on the flange 18 of the hollow spindle 14. The polygonal section 19 is followed by a cylindrical section 23 of the clamping bolt 22, which engages in the opening 17 of the tool 12 and to which the flange 16 is connected.

Ein Werkzeugwechsel geschieht nun auf folgende Weise:A tool change now takes place in the following way:

Zunächst wird der Spannhebel 38 an seinem Ende 54 ergriffen und unter Überwindung der Kraft der Rastarretierung 52 vom Gehäuse 42 weg nach vorn verschwenkt. Dadurch bewegt sich das kurze Hebelende 44 mit seiner Rolle 50 in einer dem Werkzeug 12 entgegengesetzten Richtung, wodurch die beiden Gabelenden 36 auf die Ringschulter 31 gedrückt werden und der verschiebbare Anschlag 30 somit in Richtung auf das Werkzeug 12 verschoben wird. Dadurch wird die formschlüssige Verbindung zwischen dem Sicherungselement 20 und dem verschiebbaren Anschlag 30 aufgehoben und das Sicherungselement von der Kraft der Federelemente 26 entlastet, so daß die Mutter ohne Zuhilfenahme eines Werkzeuges vom Gewinde 32 des Spannbolzens 22 abgeschraubt werden kann.First, the tensioning lever 38 is gripped at its end 54 and pivoted away from the housing 42 to overcome the force of the locking means 52. This moves the short Lever end 44 with its roller 50 in a direction opposite the tool 12, whereby the two fork ends 36 are pressed onto the annular shoulder 31 and the displaceable stop 30 is thus displaced in the direction of the tool 12. As a result, the positive connection between the securing element 20 and the displaceable stop 30 is released and the securing element is relieved of the force of the spring elements 26, so that the nut can be unscrewed from the thread 32 of the clamping bolt 22 without the aid of a tool.

Nun kann der Spannbolzen 22 aus der Hohlspindel 14 herausgezogen werden, so daß das Werkzeug 12 abgenommen werden kann. Ein neues Werkzeug 12 wird nach Durchstecken des Spannbolzens 22 durch seine zentrale Öffnung 17 gesichert und anschließend in umgekehrter Weise nach Aufschrauben der Spannmutter drehfest gesichert.Now the clamping bolt 22 can be pulled out of the hollow spindle 14 so that the tool 12 can be removed. A new tool 12 is secured after inserting the clamping bolt 22 through its central opening 17 and then secured in a rotationally fixed manner in the reverse manner after the clamping nut has been screwed on.

Um einen Austritt von Schmiermittel aus dem Getriebe nach außen zu verhindern, ist zwischen dem Festanschlag 28 und dem Gehäusesitz des Kugellagers 56 eine Dichtung 57 angeordnet.In order to prevent lubricant from escaping from the transmission to the outside, a seal 57 is arranged between the fixed stop 28 and the housing seat of the ball bearing 56.

Bei einer Fehlbedienung wäre es denkbar, daß die Maschine eingeschaltet wird, während sich der Spannhebel 38 in der Lösestellung befindet, also vom Gehäuse nach vorn abgeschwenkt ist. In dieser Stellung liegen die beiden Gabelenden 36 unmittelbar auf der Ringschulter 31 des verschiebbaren Anschlages 30 an.In the event of incorrect operation, it would be conceivable for the machine to be switched on while the tensioning lever 38 is in the release position, that is to say it has been pivoted forward from the housing. In this position, the two fork ends 36 rest directly on the annular shoulder 31 of the displaceable stop 30.

Um ein Festfressen zwischen den Gabelenden 36 und der Ringschulter 31 zu vermeiden, ist in jedem Gabelende 36 ein Wälzelement 39 in Form einer Rolle eingelassen, wodurch die Reibung erheblich vermindert wird und so ein Festfressen infolge einer Fehlbedienung verhindert wird.In order to avoid seizing between the fork ends 36 and the annular shoulder 31, a rolling element 39 in the form of a roller is embedded in each fork end 36, as a result of which the friction is considerably reduced and thus seizing due to incorrect operation is prevented.

Eine leicht abgewandelte Ausführung ist in den Figuren 4 und 5 dargestellt.A slightly modified embodiment is shown in FIGS. 4 and 5.

Auch hierbei ist eine Hohlspindel 64 mittels zweier Kugellager 106, 108 gelagert und über das Abtriebsrad 65 eines Winkelgetriebes angetrieben. Ein Schleifwerkzeug 62 ist in entsprechender Weise zwischen einem Flansch 68 am äußeren Ende der Hohlspindel 64 und einem Flansch 66 eines in die Hohlspindel 64 eingeführten Spannbolzens 72 gehalten. Der Spannbolzen 72 ist in entsprechender Weise mit Hilfe eines Mehrkantabschnittes 69 formschlüssig am Flansch 68 der Hohlspindel 64 gesichert. Zur Zentrierung des Werkzeugs 62 schließt sich an den Mehrkantabschnitt 69 des Spannbolzens 64 ein zylindrischer Abschnitt 73 an, welcher vom Flansch 66 abgeschlossen wird.Here, too, a hollow spindle 64 is supported by means of two ball bearings 106, 108 and driven via the driven gear 65 of an angular gear. A grinding tool 62 is held in a corresponding manner between a flange 68 at the outer end of the hollow spindle 64 and a flange 66 of a clamping bolt 72 inserted into the hollow spindle 64. The clamping bolt 72 is secured in a corresponding manner with the aid of a polygonal section 69 on the flange 68 of the hollow spindle 64. To center the tool 62, the polygonal section 69 of the clamping bolt 64 is followed by a cylindrical section 73, which is closed off by the flange 66.

Der Spannbolzen 72 steht mit seinem dem Werkzeug 62 abgewandten Ende aus dem Gehäuse 92 nach außen hervor und ist an seinem Ende über einen Bajonettverschluß 82 mit einem Sicherungselement 70 festgelegt.The clamping bolt 72 protrudes outward from the housing 92 with its end facing away from the tool 62 and is fixed at its end via a bayonet catch 82 with a securing element 70.

Entsprechend der vorgenannten Ausführung ist auf der Hohlspindel 64 ein Festanschlag 78 angeordnet, dem ein verschiebbarer Anschlag 80 zugeordnet ist. Zwischen dem Festanschlag 78 und dem verschiebbaren Anschlag 80 sind Federelemente 76 vorgesehen, durch die der büchsenförmig ausgebildete, verschiebbare Anschlag 80 nach außen gegen das Sicherungselement 70 beaufschlagt ist.In accordance with the aforementioned embodiment, a fixed stop 78 is arranged on the hollow spindle 64, to which a displaceable stop 80 is assigned. Between the fixed stop 78 and the displaceable stop 80, spring elements 76 are provided, by means of which the sleeve-shaped, displaceable stop 80 is urged outwards against the securing element 70.

In der gezeichneten Spannstellung wird also das Sicherungselement 70 in einer dem Werkzeug 62 entgegengesetzten Richtung beaufschlagt, wodurch das Werkzeug 62 zwischen den beiden Flanschen 66 und 68 drehfest eingespannt ist.In the drawn clamping position, the securing element 70 is thus acted upon in a direction opposite to the tool 62, as a result of which the tool 62 is clamped in a rotationally fixed manner between the two flanges 66 and 68.

Zum Wechseln des Werkzeuges 62 ist auch hierbei eine Spanneinrichtung 74 vorgesehen, durch welche der verschiebbare Anschlag 80 durch Umlegen eines Spannhebels 88 in Richtung auf das Werkzeug 62 verschiebbar ist, wodurch das Sicherungselement 70 von der Kraft der Federelemente 76 entlastet wird, so daß dieses vom Ende des Spannbolzens 72 gelöst werden kann und der Spannbolzen 72 aus der Öffnung 67 des Werkzeuges 62 herausgezogen werden kann.To change the tool 62, a clamping device 74 is also provided, through which the displaceable stop 80 by shifting a clamping lever 88 in the direction of the tool 62 is displaceable, whereby the securing element 70 is relieved of the force of the spring elements 76 so that it can be released from the end of the clamping bolt 72 and the clamping bolt 72 from the opening 67 of the tool 62nd can be pulled out.

Zur Sicherung des Sicherungselementes 70 ist anstelle einer Spannmutter bei der Ausführung gemäß Fig. 3 ein Bajonettverschluß 82 vorgesehen. Das Sicherungselement 70 ist als einfacher Rändelknopf ausgeführt, an dem ein radialer Arretierstift 79 angeordnet ist. Am Ende des Spannbolzens 72 ist eine Axialnut 83 vorgesehen, von welcher aus mehrere schräge Steigungsrillen 85 abgehen. Das Sicherungselement 70 kann in der Lösestellung vom Ende des Spannbolzens 72 aus durch die Axialnut 83 mit seinem Arretierstift 79 eingeführt werden und seitlich in einer der Steigungsrillen 85 eingerastet werden. Soll ein Werkzeug anderer Stärke befestigt werden, so kann der Arretierstift 79 in einer anderen Steigungsrille 85 verrastet werden.To secure the securing element 70, a bayonet lock 82 is provided instead of a clamping nut in the embodiment according to FIG. 3. The securing element 70 is designed as a simple knurled knob on which a radial locking pin 79 is arranged. At the end of the clamping bolt 72, an axial groove 83 is provided, from which a plurality of oblique pitch grooves 85 extend. The securing element 70 can be inserted in the release position from the end of the clamping bolt 72 through the axial groove 83 with its locking pin 79 and can be latched laterally into one of the pitch grooves 85. If a tool of a different thickness is to be fastened, the locking pin 79 can be locked in another pitch groove 85.

In der gezeichneten Spannstellung ist der Arretierstift 79 am Ende einer Steigungsrille 85 gehalten, so daß das Sicherungselement in dieser Stellung gesichert ist.In the tensioned position shown, the locking pin 79 is held at the end of a slope groove 85, so that the securing element is secured in this position.

Die Spanneinrichtung 74 weist in entsprechender Weise eine Spanngabel 84 mit U-förmiger Grundform auf, deren beide Gabelenden 86 über einen Mittelsteg 96 verbunden sind, von dem ein gemeinsames Gabelende 87 absteht. Die Spanngabel 84 kann durch Betätigung des gemeinsamen Gabelendes 87 um eine gerätefeste Drehachse 90 verschwenkt werden.In a corresponding manner, the clamping device 74 has a clamping fork 84 with a U-shaped basic shape, the two fork ends 86 of which are connected via a central web 96, from which a common fork end 87 protrudes. The clamping fork 84 can be pivoted about an axis of rotation 90 fixed to the device by actuating the common fork end 87.

Im Unterschied zur zuvor beschriebenen Ausführung ist die Spanngabel 84 an ihren beiden Gabelenden 86 über seitlich hervorstehende Stifte 91 am Gehäuse 92 gelagert. Die Drehachse der Spanngabel 84 verläuft also durch die beiden Gabelenden 86. Im mittleren Bereich 93 der Spanngabel 84 sind Wälzelemente 89 in Form von Rollen zur Reibungsverminderung angeordnet. Die Kontaktfläche zwischen der Ringschulter 81 des verschiebbaren Anschlages 80 und der Spanngabel 84 wird also durch die Wälzelemente 89 im mittleren Bereich 93 der Spanngabel gebildet.In contrast to the previously described embodiment, the tensioning fork 84 is supported on its two fork ends 86 on the housing 92 by means of laterally projecting pins 91. The axis of rotation of the Tensioning fork 84 thus runs through the two fork ends 86. In the central region 93 of the tensioning fork 84, rolling elements 89 are arranged in the form of rollers to reduce friction. The contact surface between the annular shoulder 81 of the displaceable stop 80 and the clamping fork 84 is thus formed by the rolling elements 89 in the central region 93 of the clamping fork.

Der Spannhebel 88 ist außerhalb des Gehäuses 92 mittels eines Stiftes 98 verschwenkbar gelagert. An diesem Ende ist der Spannhebel 88 als Exzenter 95 ausgebildet, welcher an einem im Gehäuse 92 axial verschieblichen Druckstück 97 anliegt. Das Ende des Druckstückes 97 liegt an dem gemeinsamen Ende 87 der Spanngabel 84 an. Die Spanngabel 84 ist durch eine Feder 99 gegen das Druckstück 97 beaufschlagt, so daß die Spanngabel 84 in der gezeichneten Spannstellung vom verschiebbaren Anschlag 80 abgehoben ist.The tensioning lever 88 is pivotally mounted outside the housing 92 by means of a pin 98. At this end, the tensioning lever 88 is designed as an eccentric 95, which bears against a pressure piece 97 which is axially displaceable in the housing 92. The end of the pressure piece 97 lies against the common end 87 of the clamping fork 84. The tensioning fork 84 is urged against the pressure piece 97 by a spring 99, so that the tensioning fork 84 is lifted off the displaceable stop 80 in the tensioned position shown.

Der Spannhebel 88 erstreckt sich von dem Exzenter 95 aus mit einem etwa trapezförmigen Abschnitt 94 über das Ende des Spannbolzens 72, und das Sicherungselement 70 und liegt mit seinem Ende mit einem flachen Abschnitt am Gehäuse 92 an, von dem aus ein gebogener Abschnitt 104 nach außen absteht.The tensioning lever 88 extends from the eccentric 95 with an approximately trapezoidal section 94 over the end of the tensioning bolt 72, and the securing element 70 and lies with its end with a flat section on the housing 92, from which a bent section 104 extends outwards protrudes.

Wird nun der Spannhebel 88 aus der gezeichneten Spannstellung vom Gehäuse 92 weg nach vorn verschwenkt, so wird das Druckstück 97 über den Exzenter 95 in Richtung auf das Werkzeug 62 verschoben. Dadurch wird die Spanngabel 84 an ihrem gemeinsamen Ende 87 in Richtung auf das Werkzeug 62 bewegt, wodurch der verschiebbare Anschlag 80 in Richtung auf das Werkzeug 62 verschoben wird.If the clamping lever 88 is now pivoted away from the housing 92 from the clamping position shown, the pressure piece 97 is displaced via the eccentric 95 in the direction of the tool 62. As a result, the clamping fork 84 is moved at its common end 87 in the direction of the tool 62, as a result of which the displaceable stop 80 is displaced in the direction of the tool 62.

Dadurch wird der Arretierstift 79 des Sicherungselementes 70 entlastet, so daß der Arretierstift 79 durch die Steigungsrille 85 bis zur Axialnut 83 des Bajonettverschlusses 82 bewegt werden kann und durch die Axialnut 83 nach außen vom Spannbolzen 72 abgezogen werden kann.As a result, the locking pin 79 of the securing element 70 is relieved of load, so that the locking pin 79 is moved through the gradient groove 85 to the axial groove 83 of the bayonet catch 82 can and can be pulled out through the axial groove 83 from the clamping bolt 72.

Nun kann das Werkzeug 62 in bekannter Weise durch Herausziehen des Spannbolzens 72 gewechselt werden.The tool 62 can now be changed in a known manner by pulling out the clamping bolt 72.

Claims (21)

  1. Portable machine tool, in particular an angle grinding apparatus, having a motor for driving a tool (12, 62) by means of an angular gear, having a hollow spindle (14, 64) at one end of which the tool (12, 62) can be secured between two flanges (16, 18; 66, 68), having a clamping bolt (22, 72) by means of which the tool (12, 62) can be clamped such that it is fixed for rotation, and having a securing element (20, 70) for securing the tool (12, 62) such that it is fixed for rotation with a clamping device (24, 74) which can be manually operated and which can be moved against the force of at least one resilient element (26, 76) between a clamping position in which the tool (12, 62) is clamped in the axial direction and a releasing position in which the tool (12, 62) is released in order to be changed manually, the resilient element (26, 76) being disposed between an axial fixed stop (28, 78) and an axially displaceable stop (30, 80), characterized in that the securing element (20, 70) is provided at the end of the clamping bolt (22, 72) remote from the tool (12, 62); and in that the displaceable stop (30, 80) acts on the securing element (20, 70) in the clamping position in order to secure the tool (12, 62) such that it is fixed for rotation.
  2. Machine tool according to Claim 1, characterized in that the securing element (20, 70) is positively secured in the clamping position.
  3. Machine tool according to Claim 1 or 2, characterized in that the displaceable stop (30, 80) is sleeve-shaped and disposed coaxially on the hollow spindle (14, 64).
  4. Machine tool according to any one of the preceding claims, characterized in that the securing element (20) is in the form of a tightening nut which can be screwed onto a thread (32) of the clamping bolt (22).
  5. Machine tool according to any one of the preceding claims, characterized in that the securing element (70) can be positively secured on the clamping bolt (72) by means of a bayonet-type locking device (82).
  6. Machine tool according to Claim 5, characterized in that the bayonet-type locking device (82) can be locked in various axial positions.
  7. Machine tool according to Claim 6, characterized in that inclined bayonet grooves (85) are provided on the clamping bolt (72) and are connected for locking to a locking pin (79) by an axial slot (83).
  8. Machine tool according to any one of Claims 1 - 6, characterized in that the displaceable stop (30) and the securing element (20) comprise serrations (21) by means of which the securing element (20) is positively secured in the clamping position.
  9. Machine tool according to any one of the preceding claims, characterized in that the clamping device (24) comprises a clamping fork (34) which is mounted so as to be rotatable about a fixed axis of rotation (40) and of which the free fork ends (36) act on the displaceable stop (30) for axial displacement.
  10. Machine tool according to any one of Claims 1 - 8, characterized in that the clamping device (74) comprises a clamping fork (84) which is mounted at its two fork ends (86) so as to rotate at a fixed axis of rotation (90) and of which the central region (93) acts on the displaceable stop (80) for axial displacement.
  11. Machine tool according to Claim 9 or 10, characterized in that rolling elements (39, 99) for reducing friction are provided on the contact surface between the clamping fork (34, 84) and the displaceable stop (30, 80).
  12. Machine tool according to any one of the preceding claims, characterized in that a clamping lever (38, 88) by means of which the common end of the clamping fork (34, 84) remote from the axis of rotation (40, 90) can be displaced in the axial direction is provided for actuating the clamping fork (34, 84).
  13. Machine tool according to any one of Claims 9 - 12, characterized in that the clamping lever (38) comprises, for actuation, a long lever end (46) which is rotatably mounted on the housing (42) by means of a pin (48) and is connected to a short lever end (44) by means of which the common end (37) of the clamping fork (34) can be axially displaced when the clamping lever (38) is actuated.
  14. Machine tool according to any one of Claims 9 - 12, characterized in that the clamping lever (88) is rotatably mounted on the housing (92) by means of an eccentric (95) which acts on the common end (87) of the clamping fork (84) by means of an axially movable thrust member (97) for axial displacement.
  15. Machine tool according to Claim 14, characterized in that the clamping fork (84) is raised off the displaceable stop (80) in the clamping position by means of a spring (99).
  16. Machine tool according to any one of Claims 2 - 15, characterized in that the axial displacement path between the clamping position and the releasing position is at least so great that when the frictional engagement between the tool (12, 62) and the flanges (16, 18; 66, 68) is eliminated in the releasing position the lift of the positive securing system of the securing element (20, 70) can also be overcome.
  17. Machine tool according to any one of the preceding claims, characterized in that a seal (57, 107) is disposed between the fixed stop (28, 78) and the housing (42, 92) for sealing the mechanism housing externally.
  18. Machine tool according to any one of Claims 12 - 17, characterized in that the clamping lever (38) can be locked in the clamping position with its free end on the housing (42).
  19. Machine tool according to any one of Claims 12 - 18, characterized in that the free end (54, 104) of the clamping lever (38, 88) projects externally from the housing (42, 92).
  20. Machine tool according to any one of the preceding claims, characterized in that the clamping bolt (22, 72) is connected such that it is fixed for rotation to the hollow spindle (14, 64) by means of a positive securing system.
  21. Machine tool according to Claim 20, characterized in that the clamping bolt (22, 72) comprises a polygonal portion (19, 69) which engages positively the flange (18, 68) at the outer end of the hollow spindle (14, 64).
EP92107613A 1991-07-05 1992-05-06 Portable power tool Expired - Lifetime EP0521259B1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE4122320 1991-07-05
DE19914122320 DE4122320A1 (en) 1991-07-05 1991-07-05 Hand-held power driven grinder - has clamping device to hold grinding wheel which does not require use of additional tools
DE19914134072 DE4134072A1 (en) 1991-10-15 1991-10-15 Portable machine tool spindle
DE4134072 1991-10-15
DE4134887 1991-10-23
DE4134887 1991-10-23

Publications (2)

Publication Number Publication Date
EP0521259A1 EP0521259A1 (en) 1993-01-07
EP0521259B1 true EP0521259B1 (en) 1994-07-27

Family

ID=27202689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92107613A Expired - Lifetime EP0521259B1 (en) 1991-07-05 1992-05-06 Portable power tool

Country Status (5)

Country Link
US (1) US5263283A (en)
EP (1) EP0521259B1 (en)
JP (1) JP2980269B2 (en)
DE (1) DE59200319D1 (en)
ES (1) ES2066512T3 (en)

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Also Published As

Publication number Publication date
JPH05185363A (en) 1993-07-27
DE59200319D1 (en) 1994-09-01
JP2980269B2 (en) 1999-11-22
US5263283A (en) 1993-11-23
EP0521259A1 (en) 1993-01-07
ES2066512T3 (en) 1995-03-01

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