EP0447408B1 - Hand tool with a multipart, manually operated quick-change clamping device - Google Patents

Hand tool with a multipart, manually operated quick-change clamping device Download PDF

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Publication number
EP0447408B1
EP0447408B1 EP89911766A EP89911766A EP0447408B1 EP 0447408 B1 EP0447408 B1 EP 0447408B1 EP 89911766 A EP89911766 A EP 89911766A EP 89911766 A EP89911766 A EP 89911766A EP 0447408 B1 EP0447408 B1 EP 0447408B1
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EP
European Patent Office
Prior art keywords
threaded part
rolling
hand tool
tool according
thrust plate
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP89911766A
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German (de)
French (fr)
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EP0447408A1 (en
Inventor
Günter Schaal
Walter Barth
Gerd Berner
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to AT89911766T priority Critical patent/ATE84253T1/en
Publication of EP0447408A1 publication Critical patent/EP0447408A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9377—Mounting of tool about rod-type shaft
    • Y10T83/9379—At end of shaft
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9464—For rotary tool

Definitions

  • the invention relates to a hand-held machine tool with a multi-part, manually operated quick-action clamping device for disc-shaped tools according to the generic preamble of the main claim.
  • Hand machine tools according to the generic term are primarily grinding machines. Such a machine is known with a quick release device according to WO 88/05386.
  • the disk-shaped tools are held on one side on a shoulder of a drive spindle and can be acted upon by a pressure plate of the clamping device on the other side.
  • the pressure plate concentrically engages around a threaded part, which is axially secured to it and is rotatably arranged.
  • a hand screw part surrounds the pressure plate in a sleeve-like manner and forms an annular space with this and the pressure plate, in which at least one roller bearing and a gear unit coupling the hand screw part, the threaded part and the pressure plate are arranged.
  • a disadvantage of the known handheld power tool is a relatively high and uncontrollable clamping force between the pressure plate and the tool as a result of the automatic clamping when this machine is in operation.
  • Another disadvantage is the complicated and fault-prone construction of the tensioning device. Vibrations and dust, in particular, impair the efficiency of the transmission.
  • the handheld power tool 1 shown in FIG. 1 has a quick-action clamping device 2, which holds a disk-shaped tool 3, in particular a grinding wheel, against a shoulder 4 of a drive spindle 5.
  • the quick release device 2 is screwed onto a thread 6 of the drive spindle 5 of the hand machine tool 1.
  • An annular disc-shaped pressure plate 7 of the quick-action clamping device 2 transmits its clamping force to the tool 3.
  • the pressure plate 7 is provided on the side facing away from the tool 3 with a circular groove 7 'in cross section, in which spherical rolling elements 8 of a first rolling bearing 9 are provided a cage 16, rollable storage.
  • an inner, ring-like plate spring 10' serves as a running surface which is positively coupled, entrainingly, to a hand screw part 11 on its outer diameter.
  • a second roller bearing 12, provided with a cage 17, is supported on a roll between the plate spring 10 'and an end face of a threaded part 13 of the quick release device 2.
  • the pressure plate 7 surrounds the threaded part 13 concentrically in a ring-like manner and is opposite this by a locking ring 15 against axial displacement secured.
  • the hand screw part 11 surrounds the pressure plate 7 and the threaded part 13 sleeve-like and is axially secured relative to these by appropriately designed stop-like projections 13 'and by sealing rings 18, 18'.
  • An annular space 14 is formed in the interior of the quick-action clamping device 2 by the arrangement of the pressure plate 7, the threaded part 13 and the screw-on screw part 11 described above.
  • a tool is clamped by means of the quick-action clamping device 2 in the following way:
  • the entire quick-action clamping device 2 is screwed - in the direction of the tool 3 - until the pressure plate 7 is in contact with the tool 3, that is to say a positive connection is achieved.
  • the threaded part 13 is rotated synchronously with the manual screw part 11, as long as the friction between the threaded part 13 and the thread of the drive spindle 5 or between the pressure plate 7 and the tool 3 - hereinafter referred to as "external” friction, is lower.
  • the friction of the parts forming a rolling planetary gear within the annular space 14 - hereinafter referred to as "internal" friction.
  • the size of the torque that can be transmitted can be defined in a defined manner by appropriate design of the rolling planetary gear, in particular by prestressing and dimensioning plate spring 10 or 19, dimensioning the rolling elements 8 and selecting the appropriate material.
  • sealing rings 18, 18 ' are arranged, which are to be sealed surfaces 18' on the hand screw part 11 and the threaded part 13 are assigned.
  • the threaded part 13 may rust on the drive spindle 5 the threaded part 13 is provided with engagement points 21, which enable the use of a separate tool for releasing the quick release device 2.
  • the roller bearing 9 is in direct frictional engagement with the hand screw part 11, as if the inner plate spring 10 'from FIG. 1 were a rigid, one-piece component of the hand screw part 11 in the form of a projection 20
  • the second roller bearing 12 is arranged such that it can roll between the projection 20 and an outer plate spring 19.
  • the outer plate spring 19 is braced on one side on the roller bearing 12 and on the other side on the threaded part 13 supported on a stop-like projection 13 '.
  • the arrangement of the plate spring 19 is provided for tolerance compensation within the quick-action clamping device or for producing the minimal frictional engagement required for a rolling planetary gear.
  • ball, roller or needle bearings can be used as roller bearings as required.
  • the quick release device 2 can also be designed as a screw instead of a nut.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Gripping On Spindles (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Earth Drilling (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)

Abstract

PCT No. PCT/DE89/00687 Sec. 371 Date May 24, 1991 Sec. 102(e) Date May 24, 1991 PCT Filed Oct. 26, 1989 PCT Pub. No. WO90/06210 PCT Pub. Date Jun. 14, 1990.For a hand power tool (1) with a multi-part manually operable quick-action chuck (2) for a disc-shaped tool (3) which is held on a shoulder (4) of a drive spindle (5) and onto which a force can be loaded from the other side by a pressure plate (7), with the pressure plate (7) concentrically embracing a threaded part (13) and being arranged positionally secured in relation to the threaded part and rotatable, with a hand screw part (11) embracing the threaded part (13) and th pressure plate (7) like a sleeve, and forming an annulus (14) with these, which contains at least a rolling contact bearing (9) and a drive which couples together the hand screw part (11), the threaded part (13), and the pressure plate (7), for improved function and a simplified design, and for a limitation of the maximum clamping pressure on the tool, a rolling planetary drive is formed from at least one of the rolling contact bearings (9, 12) in conjunction with a springly element (10), the drive which couples the pressure plate (7), the threaded part (13), and the hand screw part (11).

Description

Die Erfindung betrifft eine Handwerkzeugmaschine mit einer mehrteiligen, handbetätigbaren Schnellspanneinrichtung für scheibenförmige Werkzeuge nach dem gattungsbildenden Oberbegriff des Hauptanspruchs. Handwerkzeugmaschinen entsprechend dem Oberbegriff sind vor allem Schleifmaschinen. Eine derartige Maschine ist mit einer Schnellspanneinrichtung gemäß der WO 88/05386 bekannt. Bei der Bekannten Handwerkzeugmaschine sind die scheibenförmigen Werkzeuge auf einer Seite an einer Schulter einer Antriebsspindel gehalten und auf der anderen Seite von einer Druckplatte der Spanneinrichtung kraftbeaufschlagbar. Dabei umgreift die Druckplatte konzentrisch ein Gewindeteil, das axial zu dieser lagegesichert und drehbar angeordnet ist. Ein Handschraubteil umgreift die Druckplatte hülsenartig und bildet mit dieser und der Druckplatte einen Ringraum, in dem mindestens ein Wälzlager sowie ein das Handschraubteil, das Gewinde- teil und die Druckplatte miteinander koppelndes Getriebe angeordnet ist. Beim Anschrauben und Festziehen der Spanneinrichtung wird die Druckplatte axial gegen das Werkzeug gedrückt und dadurch das Werk- zeug gegen die spindelseitige Schulter gepreßt. Ein selbsttätiges Nachziehen der Spanneinrichtung geschieht beim Einschalten der Handwerkzeugmaschine. Das Getriebe ermöglicht eine Übersetzung mit Drehmomenterhöhung beim Festziehen. Die Drehmomenterhöhung wird auch beim Lösen der Spanneinrichtung durch Drehen des Handschraubteiles wirksam. Dabei wird der Reibschluß zwischen der Druckplatte und dem Werkzeug aufgehoben. Sobald dieser Reibschluß nicht mehr besteht, ist die Spanneinrichtung im Ganzen lösbar.The invention relates to a hand-held machine tool with a multi-part, manually operated quick-action clamping device for disc-shaped tools according to the generic preamble of the main claim. Hand machine tools according to the generic term are primarily grinding machines. Such a machine is known with a quick release device according to WO 88/05386. In the known hand-held power tool, the disk-shaped tools are held on one side on a shoulder of a drive spindle and can be acted upon by a pressure plate of the clamping device on the other side. The pressure plate concentrically engages around a threaded part, which is axially secured to it and is rotatably arranged. A hand screw part surrounds the pressure plate in a sleeve-like manner and forms an annular space with this and the pressure plate, in which at least one roller bearing and a gear unit coupling the hand screw part, the threaded part and the pressure plate are arranged. When the clamping device is screwed on and tightened, the pressure plate is pressed axially against the tool, thereby pressing the tool against the spindle-side shoulder. The tensioning device is automatically retightened when the hand-held power tool is switched on. The gearbox enables a transmission with torque increase when tightening. The torque increase is also effective when the clamping device is released by turning the hand screw part. The friction between the pressure plate and the tool is eliminated. As soon as this frictional connection no longer exists, the clamping device can be released as a whole.

Nachteil für die bekannte Handwerkzeugmaschine ist eine verhältnismäßig hohe und unkontrollierbare Spannkraft zwischen der Druckplatte und dem Werkzeug infolge des selbsttätigen Spannens beim Betrieb dieser Maschine. Ein weiterer Nachteil ist die komplizierte und störanfällige Konstruktion der Spanneinrichtung. Insbesondere Schwingungen und Staub verschlechtern den Wirkungsgrad des Getriebes.A disadvantage of the known handheld power tool is a relatively high and uncontrollable clamping force between the pressure plate and the tool as a result of the automatic clamping when this machine is in operation. Another disadvantage is the complicated and fault-prone construction of the tensioning device. Vibrations and dust, in particular, impair the efficiency of the transmission.

Vorteile der ErfindungAdvantages of the invention

Für die erfindungsgemäße Handwerkzeugmaschine mit den kennzeichnenden Merkmalen des Hauptanspruchs ergeben sich folgende Vorteile: Nach einem Werkzeugwechsel ohne jegliche Hilfswerkzeuge mit nachfolgender Inbetriebnahme der Handwerkzeugmaschine sind die Spannkräfte auf das Werkzeug durch das rutschkupplungsartig wirkende Kugelumlaufgetriebe definiert und begrenzt. Das Getriebe der Spanneinrichtung ist gegen Staub und Schwingungen unempfindlich bzw. auch im zusammengebauten Zustand leicht zu reinigen. Auch bereits vorhandene andere Handwerkzeugmaschinen mit scheibenförmigen Werkzeugen können ohne besonderen Umbau mit der Spanneinrichtung der erfindungsgemäßen Handwerkzeugmaschine nachgerüstet werden. Durch die in den Unteransprüchen aufgeführten Merkmole sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Spanneinrichtung charakterisiert.The following advantages result for the hand-held power tool according to the invention with the characterizing features of the main claim: After a tool change without any auxiliary tools and subsequent start-up of the hand-held power tool, the clamping forces on the tool are defined and limited by the spherical gear mechanism acting like a slipping clutch. The gear unit of the tensioning device is insensitive to dust and vibrations or easy to clean even when assembled. Existing other handheld power tools with disk-shaped tools can also be retrofitted with the clamping device of the handheld power tool according to the invention without any special modifications. Advantageous further developments and improvements of the tensioning device specified in the main claim are characterized by the features listed in the subclaims.

Zeichnungdrawing

Zwei Ausführungsbeispiele der Erfindung sind nachstehend anhand der Figuren 1 und 2 der Zeichnung erläutert. Die Figuren zeigen jeweils eine Handwerkzeugmaschine mit eingespannter Schleifscheibe, dargestellt im Schnitt.Two embodiments of the invention are explained below with reference to Figures 1 and 2 of the drawing. The figures each show a hand tool with a clamped grinding wheel, shown in section.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die in Figur 1 gezeigte Handwerkzeugmaschine 1 hat eine Schnellspanneinrichtung 2, die ein scheibenförmiges Werkzeug 3, insbesondere eine Schleifscheibe, gegen eine Schulter 4 einer Antriebsspindel 5 hält. Die Schnellspanneinrichtung 2 ist dabei auf ein Gewinde 6 der Antriebsspindel 5 der Handwerkzeugmaschine 1 geschraubt.The handheld power tool 1 shown in FIG. 1 has a quick-action clamping device 2, which holds a disk-shaped tool 3, in particular a grinding wheel, against a shoulder 4 of a drive spindle 5. The quick release device 2 is screwed onto a thread 6 of the drive spindle 5 of the hand machine tool 1.

Eine ringscheibenförmige Druckplatte 7 der Schnellspanneinrichtung 2 überträgt deren Spannkraft auf das Werkzeug 3. Die Druckplatte 7 ist auf der dem Werkzeug 3 abgewandten Seite mit einer im Querschnitt kreisbogenförmigen, umlaufenden Nut 7′ versehen, in der kugelförmige Wälzkörper 8 eines ersten Wälzlagers 9, versehen mit einem Käfig 16, rollbar lagern. Auf der der Nut 7′ abgewandten Seite der Wälzkörper 8 dient diesen eine innere, ringartige Tellerfeder 10′ als Lauffläche, die an ihrem Außendurchmesser formschlüssig, mitnehmend mit einem Handschraubteil 11 gekoppelt ist. Ein zweites Wälzlager 12, versehen mit einem Käfig 17, stützt sich rollbar zwischen der Tellerfeder 10′ und einer Stirnfläche eines Gewindeteiles 13 der Schnellspanneinrichtung 2 ab.An annular disc-shaped pressure plate 7 of the quick-action clamping device 2 transmits its clamping force to the tool 3. The pressure plate 7 is provided on the side facing away from the tool 3 with a circular groove 7 'in cross section, in which spherical rolling elements 8 of a first rolling bearing 9 are provided a cage 16, rollable storage. On the side facing away from the groove 7 'of the rolling elements 8, an inner, ring-like plate spring 10' serves as a running surface which is positively coupled, entrainingly, to a hand screw part 11 on its outer diameter. A second roller bearing 12, provided with a cage 17, is supported on a roll between the plate spring 10 'and an end face of a threaded part 13 of the quick release device 2.

Die Druckplatte 7 umgibt das Gewindeteil 13 konzentrisch ringartig und ist gegenüber diesem durch einen Sicherungsring 15 gegen axiale Verschiebung gesichert. Das Handschraubteil 11 umgibt die Druckplatte 7 und auch das Gewindeteil 13 hülsenartig und ist durch entsprechend ausgebildete anschlagartige Vorsprünge 13′ und durch Dichtringe 18,18′ gegenüber diesen axial lagegesichert. Durch die vorbeschriebene Anordnung der Druckplatte 7, des Gewindeteils 13 und des Hanbschraubteils 11 wird ein Ringraum 14 im Inneren der Schnellspanneinrichtung 2 gebildet. Durch Anordnung des Sicherungsringes 15 mit Sitz in einer Nut 23 im Gewindeteil 13 sind die vorgenannten, den Ringraum 14 bildenden Teile in ihrer Lage zueinander axial gesichert.The pressure plate 7 surrounds the threaded part 13 concentrically in a ring-like manner and is opposite this by a locking ring 15 against axial displacement secured. The hand screw part 11 surrounds the pressure plate 7 and the threaded part 13 sleeve-like and is axially secured relative to these by appropriately designed stop-like projections 13 'and by sealing rings 18, 18'. An annular space 14 is formed in the interior of the quick-action clamping device 2 by the arrangement of the pressure plate 7, the threaded part 13 and the screw-on screw part 11 described above. By arranging the locking ring 15 with a seat in a groove 23 in the threaded part 13, the aforementioned parts forming the annular space 14 are axially secured in relation to one another.

Entscheidend für die erfindungsgemäße Funktion der vorbeschriebenen Ausbildung ist der drehfeste Formschluß zwischen dem Käfig 16 des ersten Wälzlagers 9 und dem Gewindeteil 13.Decisive for the function according to the invention of the above-described training is the non-rotatable form fit between the cage 16 of the first roller bearing 9 and the threaded part 13.

Das Spannen eines Werkzeuges mittels der Schnellspanneinrichtung 2 geschieht in folgender Weise: Durch Drehen am Handschraubteil 11 wird die gesamte Schnellspanneinrichtung 2 - in Richtung auf das Werkzeug 3 zu - schraubend bewegt, bis die Druckplatte 7 an dem Werkzeug 3 anliegt, also Kraftschluß erreicht ist. Während dieser ersten Schraubphase wird das Gewindeteil 13 synchron mit dem Handschraubteil 11 gedreht, solange die Reibung zwischen dem Gewindeteil 13 und dem Gewinde der Antriebsspindel 5 bzw. zwischen der Druckplatte 7 und dem Werkzeug 3 - nachfolgend als "äußere" Reibung bezeichnet, geringer ist, als die Reibung der ein Wälzumlaufgetriebe bildenden Teile innerhalb des Ringraumes 14 - nachfolgend als "innere" Reibung bezeichnet.A tool is clamped by means of the quick-action clamping device 2 in the following way: By turning the hand screw part 11, the entire quick-action clamping device 2 is screwed - in the direction of the tool 3 - until the pressure plate 7 is in contact with the tool 3, that is to say a positive connection is achieved. During this first screwing phase, the threaded part 13 is rotated synchronously with the manual screw part 11, as long as the friction between the threaded part 13 and the thread of the drive spindle 5 or between the pressure plate 7 and the tool 3 - hereinafter referred to as "external" friction, is lower. as the friction of the parts forming a rolling planetary gear within the annular space 14 - hereinafter referred to as "internal" friction.

Sobalb die "äußere" die "innere" Reibung übersteigt, setzt die Wirkung des Wälzumlaufgetriebes in der folgenden Weise ein: Die Druckplatte 7 steht gegenüber dem Werkzeug 3 still. Die Wälzkörper 8 des Wälzlogers 9 rollen auf der Druckplatte 7, angetrieben durch die Tellerfeder 10′ sowie das Hanbschraubteil 11, ab. Dabei übertrogen die Wälzkörper 8 die Umlaufbewegung des Käfigs 16 auf das Gewindeteil 17. Entsprechend den Gesetzmäßigkeiten eines Wälzumlaufgetriebes bewegt sich das Gewindeteil 13 mit der halben Umdrehungsgeschwindigkeit des Hanbschraubteiles 11. Verbunben mit dieser Untersetzung ist eine Erhöhung des übertragbaren Drehmomentes auf das Doppelte des am Handschraubteil 11 wirkenden Eingangsdrehmomentes verbunben, d.h. mit geringer Betätigungskraft am Handschraubteil 11 wird am Gewindeteil 17 ein hohes Anzugsmoment erreicht. Dieses ist begrenzt auf das von Hand aufbringbare Höchstanzugsmoment.As soon as the "external" friction exceeds the "internal" friction, the effect of the roller epicyclic gear sets in the following manner: The pressure plate 7 stands still with respect to the tool 3. The rolling elements 8 of the roller logger 9 roll on the pressure plate 7, driven by the plate spring 10 'and the lifting screw part 11, from. In doing so, the rolling elements 8 overreact the rotational movement of the cage 16 on the threaded part 17. According to the laws of a rolling planetary gear, the threaded part 13 moves at half the speed of rotation of the hand screw part 11. Connected to this reduction is an increase in the transmittable torque to twice the input torque acting on the hand screw part 11, ie With a low actuating force on the hand screw part 11, a high tightening torque is achieved on the threaded part 17. This is limited to the maximum tightening torque that can be applied by hand.

Durch die rutschkupplungsartige Wirkung des Wälzumlaufgetriebes insbesondere in Verbindung mit dem Lager 12 ist ein selbsttätiges Anziehen der Schnellspanneinrichtung über das Höchstanzugsmoment hinaus ausgeschlossen : Ist das Bremsmoment zwischen dem Werkzeug 3 und einem zu bearbeitenden Werkstück größer als das zwischen der Schulter 4 und der Druckplatte 7 wirkende Klemmoment an dem Werkzeug 3, so dreht sich das Werkzeug 3 relativ zur Werkzeugspindel 5 unter Mitnahme der Druckplatte 7. Das Gewindeteil 17 steht dabei gegenüber der Werkzeugspindel 5 still, das Handschraubteil 11 dreht sich mit der doppelten Geschwindigkeit der Druckplatte 7.Due to the slipping clutch-like effect of the rolling planetary gear, in particular in connection with the bearing 12, automatic tightening of the quick-action clamping device beyond the maximum tightening torque is precluded: If the braking torque between the tool 3 and a workpiece to be machined is greater than the clamping torque acting between the shoulder 4 and the pressure plate 7 on the tool 3, the tool 3 rotates relative to the tool spindle 5, taking the pressure plate 7 with it. The threaded part 17 is stationary with respect to the tool spindle 5, the hand screw part 11 rotates at twice the speed of the pressure plate 7.

Durch entsprechende Ausbildung des Wälzumlaufgetriebes insbesondere durch Vorspannung und Dimensionierung von Tellerfeder 10 bzw. 19, Dimensionierung der Wälzkörper 8 und entsprechende Werkstoffwahl ist die Größe des übertragbaren Momentes definiert festlegbar.The size of the torque that can be transmitted can be defined in a defined manner by appropriate design of the rolling planetary gear, in particular by prestressing and dimensioning plate spring 10 or 19, dimensioning the rolling elements 8 and selecting the appropriate material.

Zum Zweck der Abdichtung des Ringraumes 14 und damit des Wälzumlaufgetriebes gegen Staub und Feuchtigkeit sind Dichtringe 18, 18′ angeordnet, denen zu dichtende Flächen 18˝ am Handschraubteil 11 und am Gewindeteil 13 zugeordnet sind.For the purpose of sealing the annular space 14 and thus the roller gear against dust and moisture, sealing rings 18, 18 'are arranged, which are to be sealed surfaces 18' on the hand screw part 11 and the threaded part 13 are assigned.

Für Extremfälle bei besonders harten Einsatzbedingungen, d.h. bei eventuellem Festrosten des Gewindeteiles 13 auf der Antriebsspindel 5 ist das Gewindeteil 13 mit Eingriffstellen 21 versehen, die den Einsatz eines gesonderten Werkzeuges zum Lösen der Schnellspanneinrichtung 2 ermöglichen.For extreme cases in particularly tough operating conditions, ie if the threaded part 13 may rust on the drive spindle 5 the threaded part 13 is provided with engagement points 21, which enable the use of a separate tool for releasing the quick release device 2.

Bei dem in Figur 2 dargestellten zweiten Ausführungsbeispiel steht im Unterschied zu Figur 1 das Wälzlager 9 in unmittelbarem Reibschluß mit dem Handschraubteil 11, so als wäre die innere Tellerfeder 10′ aus Figur 1 hier ein starrer, einstückiger Bestandteil des Handschraubteils 11 in Form eines Vorsprungs 20. Das zweite Wälzlager 12 ist rollbar zwischen dem Vorsprung 20 und einer äußeren Tellerfeder 19 angeordnet.In the second exemplary embodiment shown in FIG. 2, in contrast to FIG. 1, the roller bearing 9 is in direct frictional engagement with the hand screw part 11, as if the inner plate spring 10 'from FIG. 1 were a rigid, one-piece component of the hand screw part 11 in the form of a projection 20 The second roller bearing 12 is arranged such that it can roll between the projection 20 and an outer plate spring 19.

Die äußere Tellerfeder 19 ist auf der einen Seite am Wälzlager 12 und auf der anderen Seite am Gewindeteil 13 an einem anschlagartigen Vorsprung 13′ abgestützt verspannt. Die Anordnung der Tellerfeder 19 ist zum Toleranzausgleich innerhalb der Schnellspanneinrichtung bzw. zur Herstellung des für ein Wälzumlaufgetriebe notwendigen minimalen Reibschlusses vorgesehen.The outer plate spring 19 is braced on one side on the roller bearing 12 and on the other side on the threaded part 13 supported on a stop-like projection 13 '. The arrangement of the plate spring 19 is provided for tolerance compensation within the quick-action clamping device or for producing the minimal frictional engagement required for a rolling planetary gear.

Die gleiche Funktion wie die äußere Tellerfeder 19 hat die innere Tellerfeder 10′ aus Figur 1. Diese bewirkt, daß für die Bedienung der Schnellspanneinrichtung 2 eine radiale Krafteinwirkung auf das Handschraubteil 11, ohne zusätzliche axiale Kraft genügt.The same function as the outer plate spring 19 has the inner plate spring 10 'from Figure 1. This causes that for the operation of the quick release device 2, a radial force on the hand screw part 11 is sufficient without additional axial force.

Bei allen Ausführungsbeispielen können als Wälzlager je nach Bedarf Kugel-, Rollen- oder Nadellager eingesetzt werden.In all of the exemplary embodiments, ball, roller or needle bearings can be used as roller bearings as required.

Die Schnellspanneinrichtung 2 kann auch als Schraube statt als Mutter ausgeführt sein.The quick release device 2 can also be designed as a screw instead of a nut.

Claims (10)

  1. Powered hand tool (1) having a multipiece, manually operable quick-acting clamping device (2) for disc-shaped tools (3) which are held on a drive spindle (5) and can be acted upon by force on one side by a thrust plate (7) of the quick-acting clamping device (2), the thrust plate (7) concentrically enclosing a threaded part (13) of the quick-acting clamping device (2) and being secured in position relative to this threaded part (13) and being rotatably arranged, a hand-screw part (11) surrounding the threaded part (13) and the thrust plate (7) like a sleeve and forming with the threaded part (13) and the thrust plate (7) an annular space (14) containing at least one rolling-contact bearing (9, 12) as well as a transmission coupling the hand-screw part (11), the threaded part (13) and the thrust plate (7) to one another, characterised in that the transmission is a rolling-contact epicyclic transmission, in particular an epicyclic ball transmission.
  2. Powered hand tool according to Claim 1, characterised in that at least one of the rolling-contact bearings (9, 12), in combination with spring-elastic means, forms the transmission member which couples the thrust plate (7), the threaded part (13) and the hand-screw part (11).
  3. Powered hand tool according to Claim 2, characterised in that the spring-elastic means are formed by a disc spring (10).
  4. Powered hand tool according to Claim 2 or 3, characterised in that the rolling-contact bodies (8) of one rolling-contact bearing (9) are coupled to the threaded part (13) in such a way as to transmit motion.
  5. Powered hand tool according to Claim 4, characterised in that, on the one hand, there is positive anti-rotation locking between the threaded part (13) and one rolling-contact bearing (9) and in that, on the other hand, there is a frictional connection between the rolling-contact bodies (8) of the rolling-contact bearing (9) and the hand-screw part (11) as well as the thrust plate (7).
  6. Powered hand tool according to Claim 5, characterised in that the threaded part (13) is provided with a locking ring (15) at the area concentrically enclosed by the thrust plate (7).
  7. Powered hand tool according to Claim 6, characterised in that the annular space (14) is sealed off in a frictionally engaged manner in particular by sealing rings (18, 18′) mounted in grooves (23).
  8. Powered hand tool according to Claim 7, characterised in that an axial ball bearing (9) supported on the thrust plate (7) runs on one end face of the disc spring (10′) and an axial roller bearing (12) supported on the threaded part (13) runs on the other end face.
  9. Powered hand tool according to Claims 2 to 8, characterised in that the disc spring (10′) is designed as a projection (20) in one piece with the hand-screw part, and in that a further disc spring (19) is supported in a restrained manner between the threaded part (13) and the axial roller bearing (12) and is at the same time the running surface of the latter.
  10. Powered hand tool according to Claim 9, characterised in that the disc spring (19) is in frictional connection with a sealing ring (18) in the hand-screw part (11).
EP89911766A 1988-12-07 1989-10-26 Hand tool with a multipart, manually operated quick-change clamping device Expired - Lifetime EP0447408B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89911766T ATE84253T1 (en) 1988-12-07 1989-10-26 HAND TOOL WITH A MULTI-PART, MANUALLY OPERATED QUICK-CLAMPING DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3841181 1988-12-07
DE3841181A DE3841181A1 (en) 1988-12-07 1988-12-07 HAND MACHINE TOOL WITH A MULTI-PIECE MANUAL QUICK-RELEASE DEVICE

Publications (2)

Publication Number Publication Date
EP0447408A1 EP0447408A1 (en) 1991-09-25
EP0447408B1 true EP0447408B1 (en) 1993-01-07

Family

ID=6368624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89911766A Expired - Lifetime EP0447408B1 (en) 1988-12-07 1989-10-26 Hand tool with a multipart, manually operated quick-change clamping device

Country Status (7)

Country Link
US (1) US5161334A (en)
EP (1) EP0447408B1 (en)
JP (1) JPH04502128A (en)
AT (1) ATE84253T1 (en)
BR (1) BR8907809A (en)
DE (2) DE3841181A1 (en)
WO (1) WO1990006210A1 (en)

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US7343841B2 (en) 2002-02-15 2008-03-18 Black & Decker Inc. Blade clamp assembly

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US20060024142A1 (en) * 2004-08-02 2006-02-02 Ducret Lucien C Torque-limiting stud
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CN102126183B (en) * 2010-01-12 2012-11-28 无锡佳特机械制造有限公司 Grinding head of roasting plate grinding processing equipment
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US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch
EP3476539A1 (en) * 2017-10-27 2019-05-01 HILTI Aktiengesellschaft Tensioning device and handheld machine tool
CN111515441A (en) * 2020-05-06 2020-08-11 河南柴油机重工有限责任公司 Cutter assembly, device and application for machining side wall of bearing seat

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US7343841B2 (en) 2002-02-15 2008-03-18 Black & Decker Inc. Blade clamp assembly
US7832319B2 (en) 2002-02-15 2010-11-16 Black & Decker Inc. Blade clamp assembly

Also Published As

Publication number Publication date
JPH04502128A (en) 1992-04-16
US5161334A (en) 1992-11-10
DE3841181A1 (en) 1990-06-13
DE3841181C2 (en) 1990-11-29
EP0447408A1 (en) 1991-09-25
WO1990006210A1 (en) 1990-06-14
DE58903244D1 (en) 1993-02-18
BR8907809A (en) 1991-08-13
ATE84253T1 (en) 1993-01-15

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