EP0605602B1 - Device fitted on hand power tools - Google Patents

Device fitted on hand power tools Download PDF

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Publication number
EP0605602B1
EP0605602B1 EP92920854A EP92920854A EP0605602B1 EP 0605602 B1 EP0605602 B1 EP 0605602B1 EP 92920854 A EP92920854 A EP 92920854A EP 92920854 A EP92920854 A EP 92920854A EP 0605602 B1 EP0605602 B1 EP 0605602B1
Authority
EP
European Patent Office
Prior art keywords
tool
shank
grooves
tool holder
locking bodies
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
EP92920854A
Other languages
German (de)
French (fr)
Other versions
EP0605602A1 (en
Inventor
Alfred Odendahl
Karl Wanner
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0605602A1 publication Critical patent/EP0605602A1/en
Application granted granted Critical
Publication of EP0605602B1 publication Critical patent/EP0605602B1/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
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084—Rotating chucks or sockets
    • B25D17/088—Rotating chucks or sockets with radial movable locking elements co-operating with bit shafts specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0003—Details of shafts of percussive tool bits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0034—Details of shank profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/003—Details relating to chucks with radially movable locking elements
    • B25D2217/0038—Locking members of special shape
    • B25D2217/0042—Ball-shaped locking members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17042—Lost motion
    • Y10T279/17068—Rotary socket

Definitions

  • the invention is based on a device on handheld power tools according to the preamble of claim 1.
  • a tool holder designed as a drill chuck is known, the rotary driving elements of which are formed by a plurality of gripping segments lying one above the other.
  • the gripping segments have an approximately trapezoidal or circular cross-sectional shape, are curved in profile and merge into curves.
  • the side surfaces of the rotary drivers are therefore uneven and are unfavorable for the transmission of a torque relative to the direction of force application.
  • the device according to the invention with the characterizing features of claim 1 has the advantage that the rotary drivers are both optimally aligned to the requirements for effective torque transmission and also offer reliable guidance and centering of the drilling tool.
  • the device has the further advantage that, despite the possibility of accommodating tool shanks of different thicknesses, the weakening of the tool shank is kept as small as possible for a large torque transmission by the rotary drivers fixedly arranged in the receiving bore.
  • the rotary drivers have guide sections which are at a distance of 4, 5 or approximately 6 mm from the central axis of the receiving bore. This means that tools with 8, 10 or 12 mm shanks can be optimally guided, which ensures excellent concentricity.
  • the arrangement of locking bodies in the area of the rotary drivers is also particularly advantageous. As a result, a weakening of the tool shank is kept within narrow limits. Elastic, flexibly mounted locking bodies automatically withdraw when a tool is inserted and then snap into the tool's axial locking grooves. This increases the ease of use.
  • the axial locking bodies engage in the receiving bore to different extents depending on the shank diameter of the tool used, this can advantageously be used to scan the diameter of the drilling tool and the speed can be set accordingly. It is particularly advantageous here that the scanning takes place purely mechanically and the information obtained is also mechanically passed on via a sleeve, so that the scanning device is insensitive to contamination and remains functional even in rough construction site operation.
  • Tools according to claims 7 ff have the particular advantage that not a unitary shank is required, but depending on the diameter of the tool head, thinner and thicker tool shanks can be inserted into the same tool holder. This is achieved by means of stepped rotary driving grooves, the more steps have to be provided, the greater the difference in diameter of the tools.
  • Figure 1 shows a device on hand machine tools in cross section with a tool shaft of small diameter used.
  • Figures 2 and 3 show the same device with different sized tool shanks.
  • FIG. 4 shows a device with two rotary drivers in a further exemplary embodiment.
  • FIG. 5 shows a longitudinal section through a tool holder according to FIG. 2.
  • the device according to the invention essentially consists of a tool holder 10 and a tool 22 held therein.
  • a basic body 11 with a receiving bore 12 is shown in section of the tool holder 10.
  • three uniformly designed immovable rotary drivers 14 protrude into the receiving bore 12.
  • the rotary drivers 14 are of stepped design, with plane flank portions 16 running radially with respect to a central axis 15 of the tool holder 10 alternating with guide sections 17 which are formed in the circumferential direction in the form of a cylinder jacket.
  • the locating bore 12 itself acts as a guide section.
  • the stepped design of the rotary driver 14 is selected so that the guide sections 17 are located coaxially to the central axis 15 on a cylinder jacket surface with a diameter of 6, 8 and 10 mm.
  • the receiving bore 12 has a diameter of 12 mm.
  • the rotary drivers 14 extend along the receiving bore 12 over a certain distance. Approximately in the middle of this distance, the rotary drivers 14 are penetrated by an opening 19, which also penetrates the base body 11. Locking bodies 20 are inserted into the openings 19, which project beyond the projection surface of the rotary drivers 14 by a certain amount.
  • a tool 22 is clamped in the tool receptacle 10 and has grooves 23 which open out towards its shaft end and extend along the shaft for rotational driving.
  • these are in each case simple, non-stepped grooves with flat side walls 25 arranged radially to the tool axis 24 and an approximately flat base surface 26 connecting the side walls 25.
  • the tool 22 has three troughs 28, one each Represent expansion of the grooves 23.
  • the troughs 28 are advantageously elongated in the axial direction of the tool 22 and are longer than the locking body 20 by the idle travel of the tool.
  • the tool holder 10 has a sliding sleeve 29 which surrounds the base body 11 and the locking body 20 and is longitudinally displaceable within limits (see also FIG. 5). It contains a thickening or a retaining ring 30, which holds the locking body 20 in the troughs 28. On the holding ring 30 there is a sheet metal ring 31 on the side, which has extensions 32 in the area of the locking body 20. The sheet metal ring 31 is pressed by a compression spring 33 onto the sliding sleeve 29 or onto the retaining ring 30.
  • Retaining ring 30 and sheet metal ring 31 can be matched to the locking body 20 so that the position of the sheet metal ring 31 indicates the depth of penetration of the locking body 20 and thus the shank diameter of the inserted tool.
  • the position of the sheet metal ring 31 or a corresponding sleeve can then be used to adjust the speed of the drive motor.
  • the troughs 28, contrary to the illustration in FIGS. 1 to 4, would have to be of different depths depending on the shaft diameter.
  • FIG. 2 shows the same tool holder 10 as shown in FIG. 1, with the only difference that a tool shaft 30 with a larger diameter is now used.
  • the tool 30 also has longitudinal grooves 33, which are each formed from two pairs of side walls 35 offset in the circumferential direction.
  • the grooves 33 are thus stepped, with radial sections 37 being formed between the side walls 35.
  • the radial sections 37 are adapted to the guide sections 17 of the tool holder 10 and extend along a cylindrical surface.
  • FIG. 3 shows a third tool 40 in the tool holder 10 which has remained unchanged.
  • the shank of the tool 40 has a diameter of 12 mm and lies against the receiving bore 12.
  • the grooves 43 are now designed in two stages instead of two stages as in the previous figure. Three pairs of side walls 45 alternate with radial sections 47. Otherwise, the tool 40 corresponds to the tools 22 and 30 previously shown.
  • the second exemplary embodiment according to FIG. 4 differs from the first exemplary embodiment only in that two rotary drivers 14 are formed on the tool holder 10 ′ and only two grooves 33 on the tool 50. It has the particular advantage that tools with two or four grooves can be clamped on the shank.
  • the rotary drivers 14 are brought into register with the grooves 23 and the tool 22 is inserted into the receiving bore 12.
  • the locking bodies 20 When the end of the tool shank reaches the locking bodies 20, they preferably deflect radially outward and snap back into the troughs 28 when the tool is pushed further. It is not readily possible to pull out the tool 23 because the locking bodies 20 are prevented from evading in this direction, for example by a sleeve.
  • this sleeve must first be operated by the operator.
  • the tool 22 is centered and guided on the rotary drivers 14 by the guide sections 17. Despite the immovable rotary driver 14, this results in good concentricity properties.
  • either the rotary drivers can be chamfered on their front edge or the grooves 23 can be chamfered at the shaft end.
  • the centering and guiding is improved by further guide sections 17.
  • the device according to the invention for the transmission of a rotary and / or impact movement to a tool is suitable for its stepped design of the rotary drivers 14 for different shank diameters, without having to change anything on the tool holder 10.
  • Drilling tools with drilling diameters between 4 and 8 mm have a shank diameter of 8 mm and are inserted into the tool holder 10 according to FIG. 1.
  • Tools with a Drill diameters between 8 and 12 mm are given a 10 mm shank according to FIG. 2.
  • Tools with drill diameters greater than 12 mm are equipped with a shank diameter of 12 mm and fit into the tool holder 10 according to the invention according to FIG. 3.
  • the device according to the invention can also be used for mechanical scanning of the size of the tool used.
  • the troughs 28 are designed to be more or less deep with respect to the receiving bore 17. Accordingly, the locking bodies 20 engage in different degrees.
  • the end position of the locking body 20 determines the position of a scanning sleeve within the tool holder, as described in DE 35 06 008 A1 (GB 21 71 340 B), which becomes the content of this document.
  • the speed of the drill is set correctly according to the drill diameter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Jigs For Machine Tools (AREA)
  • Drilling And Boring (AREA)
  • Telephone Function (AREA)
  • Surgical Instruments (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Manipulator (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Drilling Tools (AREA)

Abstract

PCT No. PCT/DE92/00820 Sec. 371 Date Mar. 25, 1994 Sec. 102(e) Date Mar. 25, 1994 PCT Filed Sep. 24, 1992 PCT Pub. No. WO93/05929 PCT Pub. Date Apr. 1, 1993.A device on machine tools for transmitting a rotational and/or percussive movement to a tool (22) has two or three rotational drivers (14) which are arranged so as to be symmetrical with respect to rotation. The rotational drivers (14) are stepped and flank parts (16) extending radially to the center axis (15) alternate with guide portions (17) extending along a cylindrical outer surface. Locking members (20) which engage in depressions (28) at the tool (22) are arranged in the region of the rotational drivers (14) for the axial locking of the tools (10). With the tool holder (10) according to the invention, tool shafts having diameters between 8 and 12 mm can be clamped without converting or modifying the tool shafts. Good true running characteristics can be achieved in spite of the stationary rotational drivers (14).

Description

Die Erfindung geht aus von einer Einrichtung an Handwerkzeugmaschinen nach dem Oberbegriff des Anspruchs 1. Aus dem DE-U 85 10 262 ist ein als Bohrfutter ausgebildeter Werkzeughalter bekannt, dessen Drehmitnahmeelemente durch mehrere übereinanderliegende Greifsegmente gebildet sind. Die Greifsegmete haben eine etwa trapezförmige bzw. kreisförmige Querschnittsform, sind im Profil gekrümmt und gehen in Rundungen ineinander über. Die Seitenflächen der Drehmitnehmer sind demnach uneben und liegen relativ zur Kraftangriffsrichtung für die Übertragung eines Drehmoments ungünstig.The invention is based on a device on handheld power tools according to the preamble of claim 1. From DE-U 85 10 262 a tool holder designed as a drill chuck is known, the rotary driving elements of which are formed by a plurality of gripping segments lying one above the other. The gripping segments have an approximately trapezoidal or circular cross-sectional shape, are curved in profile and merge into curves. The side surfaces of the rotary drivers are therefore uneven and are unfavorable for the transmission of a torque relative to the direction of force application.

Aus der EP-A-433 876 ist ferner bekannt, am Umfang des Werkzeugschaftes und der Werkzeugaufnahme mehrere Drehmitnahmen anzuordnen, welche verschiedene Querschnitte aufweisen. Dadurch wird der Querschnitt des Werkzeugschaftes geschwächt, was insbesondere bei leistungsstarken Werkzeugen mit großem Arbeitsdurchmesser bzw. bei Meißelwerkzeugen mit auftretender Stoßwellenbelastung ungünstig ist, da es zum Ausbrechen des Schaftendes führen kann.From EP-A-433 876 it is also known to arrange a plurality of rotary drivers on the circumference of the tool shank and the tool holder, which have different cross-sections. As a result, the cross section of the tool shank is weakened, which is particularly unfavorable in the case of powerful tools with a large working diameter or in the case of chisel tools with the occurrence of shock wave stress, since it can lead to the end of the shank breaking out.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Einrichtung mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß die Drehmitnehmer sowohl optimal auf die Anforderungen an eine wirkungsvolle Drehmomentübertragung ausgerichtet sind als auch eine zuverlässige Führung und Zentrierung des Bohrwerkzeugs bieten. Die Einrichtung hat den weiteren Vorteil, daß trotz der Möglichkeit, verschieden dicke Werkzeugschäfte aufzunehmen, die Schwächung des Werkzeugschafts für eine große Drehmomentübertragung durch die fest in der Aufnahmebohrung angeordneten Drehmitnehmer möglichst gering gehalten ist.The device according to the invention with the characterizing features of claim 1 has the advantage that the rotary drivers are both optimally aligned to the requirements for effective torque transmission and also offer reliable guidance and centering of the drilling tool. The device has the further advantage that, despite the possibility of accommodating tool shanks of different thicknesses, the weakening of the tool shank is kept as small as possible for a large torque transmission by the rotary drivers fixedly arranged in the receiving bore.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Einrichtung möglich. Besonders vorteilhaft ist es, wenn die Drehmitnehmer Führungsabschnitte aufweisen, die in einem Abstand von 4, 5 oder etwa 6 mm von der Mittelachse der Aufnahmebohrung entfernt sind. Damit können Werkzeuge mit 8-, 10- oder 12 mm-Schaft optimal geführt werden, was einen hervorragenden Rundlauf gewährleistet. Besonders vorteilhaft ist auch die Anordnung von Verriegelungskörpern im Bereich der Drehmitnehmer. Dadurch wird weiter eine Schwächung des Werkzeugschafts in engen Grenzen gehalten. Elastisch nachgiebig gelagerte Verriegelungskörper weichen beim Einstecken eines Werkzeugs selbsttätig zurück und rasten hinterher in Axialverriegelungsnuten des Werkzeugs ein. Dies erhöht den Bedienungskomfort. Wenn die Axialverriegelungskörper je nach Schaftdurchmesser des eingesetzten Werkzeugs unterschiedlich weit in die Aufnahmebohrung eingreifen, so kann dies vorteilhaft zur Abtastung des Bohrwerkzeugdurchmessers genutzt werden und dementsprechend die Drehzahl eingestellt werden. Besonders vorteilhaft ist hierbei, daß die Abtastung rein mechanisch erfolgt und die gewonnene Information auch mechanisch über eine Hülse weitergegeben wird, so daß die Abtasteinrichtung unempfindlich gegen Verschmutzung ist und auch bei rauhem Baustellenbetrieb funktionstüchtig bleibt.The measures listed in the dependent claims allow advantageous refinements and improvements of the device specified in claim 1. It is particularly advantageous if the rotary drivers have guide sections which are at a distance of 4, 5 or approximately 6 mm from the central axis of the receiving bore. This means that tools with 8, 10 or 12 mm shanks can be optimally guided, which ensures excellent concentricity. The arrangement of locking bodies in the area of the rotary drivers is also particularly advantageous. As a result, a weakening of the tool shank is kept within narrow limits. Elastic, flexibly mounted locking bodies automatically withdraw when a tool is inserted and then snap into the tool's axial locking grooves. This increases the ease of use. If the axial locking bodies engage in the receiving bore to different extents depending on the shank diameter of the tool used, this can advantageously be used to scan the diameter of the drilling tool and the speed can be set accordingly. It is particularly advantageous here that the scanning takes place purely mechanically and the information obtained is also mechanically passed on via a sleeve, so that the scanning device is insensitive to contamination and remains functional even in rough construction site operation.

Werkzeuge gemäß den Ansprüchen 7 ff haben den besonderen Vorteil, daß nicht ein Einheitsschaft erforderlich ist, sondern je nach Durchmesser des Werkzeugkopfes dünnere und dickere Werkzeugschäfte in die gleiche Werkzeugaufnahme eingesetzt werden können. Dies wird erreicht durch abgestufte Drehmitnahmenuten, wobei je mehr Stufen vorzusehen sind, je größer der Durchmesserunterschied der Werkzeuge ist.Tools according to claims 7 ff have the particular advantage that not a unitary shank is required, but depending on the diameter of the tool head, thinner and thicker tool shanks can be inserted into the same tool holder. This is achieved by means of stepped rotary driving grooves, the more steps have to be provided, the greater the difference in diameter of the tools.

Zeichnungdrawing

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Figur 1 zeigt eine Einrichtung an Handwerkzeugmaschinen im Querschnitt mit einem eingesetzten Werkzeugschaft von geringem Durchmesser. Die Figuren 2 und 3 zeigen die gleiche Einrichtung mit verschieden großen eingesetzten Werkzeugschäften. Figur 4 zeigt in einem weiteren Ausführungsbeispiel eine Einrichtung mit zwei Drehmitnehmern. Figur 5 zeigt einen Längsschnitt durch eine Werkzeugaufnahme gemäß Figur 2.Two embodiments of the invention are shown in the drawing and explained in more detail in the following description. Figure 1 shows a device on hand machine tools in cross section with a tool shaft of small diameter used. Figures 2 and 3 show the same device with different sized tool shanks. FIG. 4 shows a device with two rotary drivers in a further exemplary embodiment. FIG. 5 shows a longitudinal section through a tool holder according to FIG. 2.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die erfindungsgemäße Einrichtung besteht im wesentlichen aus einer Werkzeugaufnahme 10 und einem darin gehaltenen Werkzeug 22. Von der Werkzeugaufnahme 10 ist im Schnitt ein Grundkörper 11 mit einer Aufnahmebohrung 12 gezeigt. In die Aufnahmebohrung 12 ragen im ersten Ausführungsbeispiel drei gleichförmig ausgebildete unbewegliche Drehmitnehmer 14 hinein. Die Drehmitnehmer 14 sind stufig ausgebildet, wobei sich bezüglich einer Mittelachse 15 der Werkzeugaufnahme 10 radial verlaufende ebene Flankenpartien 16 mit in Umfangsrichtung zylindermantelförmig ausgebildeten Führungsabschnitten 17 abwechseln. Auch die Aufnahmebohrung 12 selbst wirkt als Führungsab schnitt. Die stufige Ausbildung der Drehmitnehmer 14 ist so gewählt, daß die Führungsabschnitte 17 auf einer Zylindermantelflache mit dem Durchmesser 6, 8 und 10 mm koaxial zur Mittelachse 15 gelegen sind. Die Aufnahmebohrung 12 hat einen Durchmesser von 12 mm.The device according to the invention essentially consists of a tool holder 10 and a tool 22 held therein. A basic body 11 with a receiving bore 12 is shown in section of the tool holder 10. In the first exemplary embodiment, three uniformly designed immovable rotary drivers 14 protrude into the receiving bore 12. The rotary drivers 14 are of stepped design, with plane flank portions 16 running radially with respect to a central axis 15 of the tool holder 10 alternating with guide sections 17 which are formed in the circumferential direction in the form of a cylinder jacket. The locating bore 12 itself acts as a guide section. The stepped design of the rotary driver 14 is selected so that the guide sections 17 are located coaxially to the central axis 15 on a cylinder jacket surface with a diameter of 6, 8 and 10 mm. The receiving bore 12 has a diameter of 12 mm.

Die Drehmitnehmer 14 erstrecken sich längs der Aufnahmebohrung 12 über eine gewisse Strecke. Etwa in der Mitte dieser Strecke sind die Drehmitnehmer 14 von einer Durchbrechung 19 durchsetzt, die ebenfalls den Grundkörper 11 durchdringt. In die Durchbrechungen 19 sind jeweils Verriegelungskörper 20 eingesetzt, die die Projektionsfläche der Drehmitnehmer 14 um ein gewisses Maß überragen. Die Verriegelungskörper 20 sind vorteilhafterweise als Kugeln, Walzen oder abgestufte Sperrkörper gemäß DE 35 06 008 A1 (= GB 21 71 340) ausgebildet. Der Inhalt dieser Schrift wird zum Bestandteil dieser Anmeldung erklärt.The rotary drivers 14 extend along the receiving bore 12 over a certain distance. Approximately in the middle of this distance, the rotary drivers 14 are penetrated by an opening 19, which also penetrates the base body 11. Locking bodies 20 are inserted into the openings 19, which project beyond the projection surface of the rotary drivers 14 by a certain amount. The locking bodies 20 are advantageously designed as balls, rollers or stepped locking bodies according to DE 35 06 008 A1 (= GB 21 71 340). The content of this document is declared part of this application.

In der Werkzeugaufnahme 10 ist ein Werkzeug 22 gespannt, das zu seinem Schaftende hin offen ausmündende, sich längs des Schafts erstreckende Nuten 23 zur Drehmitnahme aufweisen. Bei dem Werkzeug in Figur 1 sind dies jeweils einfache, ungestufte Nuten mit radial zur Werkzeugachse 24 angeordneten ebenen Seitenwänden 25 und einer die Seitenwände 25 verbindenden, etwa ebenen Grundfläche 26. Im Bereich der Verriegelungskörper 20 hat das Werkzeug 22 jeweils drei Mulden 28, die eine Erweiterung der Nuten 23 darstellen. Die Mulden 28 sind vorteilhafterweise in Achsrichtung des Werkzeugs 22 länglich ausgebildet und sind um den Leerlaufweg des Werkzeugs länger als die Verriegelungskörper 20.A tool 22 is clamped in the tool receptacle 10 and has grooves 23 which open out towards its shaft end and extend along the shaft for rotational driving. In the case of the tool in FIG. 1, these are in each case simple, non-stepped grooves with flat side walls 25 arranged radially to the tool axis 24 and an approximately flat base surface 26 connecting the side walls 25. In the area of the locking bodies 20, the tool 22 has three troughs 28, one each Represent expansion of the grooves 23. The troughs 28 are advantageously elongated in the axial direction of the tool 22 and are longer than the locking body 20 by the idle travel of the tool.

Die Werkzeugaufnahme 10 weist eine den Grundkörper 11 und die Verriegelungskörper 20 umgebende Schiebehülse 29 auf, die in Grenzen längsverschieblich ist (siehe auch Figur 5). Sie enthält eine Verdickung oder einen Haltering 30, der die Verriegelungskörper 20 in den Mulden 28 festhält. An dem Haltering 30 liegt seitlich ein Blechring 31 an, der im Bereich der Verriegelungskörper 20 Fortsatze 32 aufweist. Der Blechring 31 wird von einer Druckfeder 33 an die Schiebehülse 29 bzw. an den Haltering 30 angedrückt.The tool holder 10 has a sliding sleeve 29 which surrounds the base body 11 and the locking body 20 and is longitudinally displaceable within limits (see also FIG. 5). It contains a thickening or a retaining ring 30, which holds the locking body 20 in the troughs 28. On the holding ring 30 there is a sheet metal ring 31 on the side, which has extensions 32 in the area of the locking body 20. The sheet metal ring 31 is pressed by a compression spring 33 onto the sliding sleeve 29 or onto the retaining ring 30.

Die Verriegelungskörper 20 weichen beim Einschieben eines Werkzeugs in die Aufnahmebohrung 17 radial gegen die Kraft der Druckfeder 33 zurück, wie dies in Figur 5 gestrichelt dargestellt ist. Sie werden bei ganz eingeschobenem Werkzeugschaft von der Druckfeder 33 wieder in ihre verriegelnde Ausgangslage zurückgedrängt. Die konstruktive Ausführung und Funktionsweise entspricht im übrigen der Darstellung in der DE 32 05 063 C2 (GB 20 96 045 B2), deren Inhalt Bestandteil dieser Schrift ist.When a tool is inserted into the receiving bore 17, the locking bodies 20 withdraw radially against the force of the compression spring 33, as is shown in broken lines in FIG. 5. With the tool shank fully inserted, they are again pressed by the compression spring 33 pushed back into their locking starting position. The constructive design and mode of operation otherwise correspond to the representation in DE 32 05 063 C2 (GB 20 96 045 B2), the content of which is part of this document.

Haltering 30 und Blechring 31 können so auf die Verriegelungskörper 20 abgestimmt werden, daß die Stellung des Blechrings 31 die Eindringtiefe der Verriegelungskörper 20 und damit den Schaftdurchmesser des eingesteckten Werkzeugs anzeigt. Die Stellung des Blechrings 31 oder einer entsprechenden Hülse kann dann zur Einstellung der Drehzahl des Antriebsmotors herangezogen werden. In diesem Fall müßten die Mulden 28 entgegen der Darstellung in den Figuren 1 bis 4 je nach Schaftdurchmesser unterschiedlich tief ausgebildet werden.Retaining ring 30 and sheet metal ring 31 can be matched to the locking body 20 so that the position of the sheet metal ring 31 indicates the depth of penetration of the locking body 20 and thus the shank diameter of the inserted tool. The position of the sheet metal ring 31 or a corresponding sleeve can then be used to adjust the speed of the drive motor. In this case, the troughs 28, contrary to the illustration in FIGS. 1 to 4, would have to be of different depths depending on the shaft diameter.

In Figur 2 ist dieselbe Werkzeugaufnahme 10 wie in Figur 1 gezeigt, nur mit dem Unterschied, daß nun ein Werkzeugschaft 30 mit größerem Durchmesser eingesetzt ist. Das Werkzeug 30 weist ebenfalls längsverlaufende Nuten 33 auf, die aus jeweils zwei in Umfangsrichtung versetzten Paaren von Seitenwänden 35 gebildet sind. Die Nuten 33 sind also gestuft, wobei zwischen den Seitenwänden 35 Radialabschnitte 37 ausgebildet sind. Die Radialabschnitte 37 sind an die Führungsabschnitte 17 der Werkzeugaufnahme 10 angepaßt und erstrecken sich entlang einer Zylindermantelfläche.FIG. 2 shows the same tool holder 10 as shown in FIG. 1, with the only difference that a tool shaft 30 with a larger diameter is now used. The tool 30 also has longitudinal grooves 33, which are each formed from two pairs of side walls 35 offset in the circumferential direction. The grooves 33 are thus stepped, with radial sections 37 being formed between the side walls 35. The radial sections 37 are adapted to the guide sections 17 of the tool holder 10 and extend along a cylindrical surface.

In Figur 3 ist ein drittes Werkzeug 40 in der unverändert gebliebenen Werkzeugaufnahme 10 gezeigt. Der Schaft des Werkzeugs 40 hat einen Durchmesser von 12 mm und liegt an der Aufnahmebohrung 12 an. Die Nuten 43 sind statt wie in der vorigen Figur zweistufig nun dreistufig ausgebildet. Drei Paare von Seitenwänden 45 wechseln sich mit Radialabschnitten 47 ab. Im übrigen entspricht das Werkzeug 40 den vorher gezeigten Werkzeugen 22 und 30.FIG. 3 shows a third tool 40 in the tool holder 10 which has remained unchanged. The shank of the tool 40 has a diameter of 12 mm and lies against the receiving bore 12. The grooves 43 are now designed in two stages instead of two stages as in the previous figure. Three pairs of side walls 45 alternate with radial sections 47. Otherwise, the tool 40 corresponds to the tools 22 and 30 previously shown.

Das zweite Ausführungsbeispiel nach Figur 4 unterscheidet sich lediglich dadurch vom ersten Ausführungsbeispiel, daß jeweils zwei Drehmitnehmer 14 an der Werkzeugaufnahme 10' und jeweils nur zwei Nuten 33 an dem Werkzeug 50 ausgebildet sind. Es hat den besonderen Vorteil, daß auch Werkzeuge mit zwei oder vier Nuten am Schaft gespannt werden können.The second exemplary embodiment according to FIG. 4 differs from the first exemplary embodiment only in that two rotary drivers 14 are formed on the tool holder 10 ′ and only two grooves 33 on the tool 50. It has the particular advantage that tools with two or four grooves can be clamped on the shank.

Zum Einsetzen eines Werkzeugs 22 in den Werkzeughalter 10 werden die Drehmitnehmer 14 mit den Nuten 23 zur Deckung gebracht und das Werkzeug 22 in die Aufnahmebohrung 12 eingeschoben. Erreicht das Ende des Werkzeugschafts die Verriegelungskörper 20, so weichen diese vorzugsweise radial nach außen aus und rasten beim Weiterschieben des Werkzeugs in die Mulden 28 wieder ein. Ein Herausziehen des Werkzeugs 23 ist nicht ohne weiteres möglich, weil die Verriegelungskörper 20 in dieser Richtung beispielsweise durch eine Hülse am Ausweichen gehindert sind. Zur Entnahme eines Werkzeugs muß dann diese Hülse zunächst von der Bedienungsperson betätigt werden. Das Werkzeug 22 wird durch die Führungsabschnitte 17 an den Drehmitnehmern 14 zentriert und geführt. Dies ergibt trotz der unbeweglichen Drehmitnehmer 14 gute Rundlaufeigenschaften. Um das Einsetzen eines Werkzeugs zu erleichtern, können entweder die Drehmitnehmer an ihrer Vorderkante abgeschrägt oder die Nuten 23 am Schaftende angefast sein. Bei dem Werkzeug mit 10 mm-Schaft gemäß Figur 2 und 4 ist die Zentrierung und Führung durch weitere Führungsabschnitte 17 verbessert.To insert a tool 22 into the tool holder 10, the rotary drivers 14 are brought into register with the grooves 23 and the tool 22 is inserted into the receiving bore 12. When the end of the tool shank reaches the locking bodies 20, they preferably deflect radially outward and snap back into the troughs 28 when the tool is pushed further. It is not readily possible to pull out the tool 23 because the locking bodies 20 are prevented from evading in this direction, for example by a sleeve. To remove a tool, this sleeve must first be operated by the operator. The tool 22 is centered and guided on the rotary drivers 14 by the guide sections 17. Despite the immovable rotary driver 14, this results in good concentricity properties. In order to facilitate the insertion of a tool, either the rotary drivers can be chamfered on their front edge or the grooves 23 can be chamfered at the shaft end. In the tool with a 10 mm shank according to FIGS. 2 and 4, the centering and guiding is improved by further guide sections 17.

Die erfindungsgemäße Einrichtung zur Übertragung einer Dreh- und/oder Schlagbewegung auf ein Werkzeug eignet sich durch seine stufenweise Ausbildung der Drehmitnehmer 14 für verschiedene Schaftdurchmesser, ohne daß an der Werkzeugaufnahme 10 etwas geändert werden müßte. Bohrwerkzeuge mit Bohrdurchmessern zwischen 4 und 8 mm erhalten einen Schaftdurchmesser von 8 mm und werden gemäß Figur 1 in die Werkzeugaufnahme 10 eingesetzt. Werkzeuge mit einem Bohrdurchmesser zwischen 8 und 12 mm erhalten einen 10 mm-Schaft gemäß Figur 2. Werkzeuge mit Bohrerdurchmessern größer als 12 mm werden mit einem Schaftdurchmesser von 12 mm ausgerüstet und passen gemäß Figur 3 in die erfindungsgemäße Werkzeugaufnahme 10.The device according to the invention for the transmission of a rotary and / or impact movement to a tool is suitable for its stepped design of the rotary drivers 14 for different shank diameters, without having to change anything on the tool holder 10. Drilling tools with drilling diameters between 4 and 8 mm have a shank diameter of 8 mm and are inserted into the tool holder 10 according to FIG. 1. Tools with a Drill diameters between 8 and 12 mm are given a 10 mm shank according to FIG. 2. Tools with drill diameters greater than 12 mm are equipped with a shank diameter of 12 mm and fit into the tool holder 10 according to the invention according to FIG. 3.

Die erfindungsgemäße Einrichtung kann auch zur mechanischen Abtastung der Größe des eingesetzten Werkzeugs genutzt werden. Je nach Bohrkopfdurchmesser sind die Mulden 28 in Bezug auf die Aufnahmebohrung 17 mehr oder weniger tief ausgebildet. Dementsprechend fallen die Verriegelungskörper 20 unterschiedlich weit ein. Die Endstellung der Verriegelungskörper 20 bestimmt die Lage einer Abtasthülse innerhalb der Werkzeugaufnahme, wie dies in der DE 35 06 008 A1 (GB 21 71 340 B), die zum Inhalt dieser Schrift wird, beschrieben ist. Je nach Stellung der Abtasthülse wird die Drehzahl der Bohrmaschine entsprechend dem Bohrerdurchmesser richtig eingestellt.The device according to the invention can also be used for mechanical scanning of the size of the tool used. Depending on the drill head diameter, the troughs 28 are designed to be more or less deep with respect to the receiving bore 17. Accordingly, the locking bodies 20 engage in different degrees. The end position of the locking body 20 determines the position of a scanning sleeve within the tool holder, as described in DE 35 06 008 A1 (GB 21 71 340 B), which becomes the content of this document. Depending on the position of the scanning sleeve, the speed of the drill is set correctly according to the drill diameter.

Claims (10)

  1. Tool holder fitted on hand power tools, in particular on hand-held drilling or percussion implements, which is suitable for transmitting a rotary and/or percussion motion to a tool (22) having a plurality of grooves (23), open towards the shank end, for the rotary driving and which has a location bore (12) having rotary drivers (14) which are firmly arranged therein, project to the inside and engage in the grooves (23) of the tool (22), characterized in that the rotary drivers (14) have flanks (16) which are stepped on at least one side in the peripheral direction, run flatly and radially and are each connected by guide sections (17) which are formed by strip-shaped sections running in the longitudinal direction of the location bore (12).
  2. Tool holder according to Claim 1, characterized in that the guide sections (17) of the rotary drivers (14), as a cylindrical surface, are at a distance of approximately 4, 5 and 6 mm from the centre axis (15) of the location bore (12) in order to centre the tool shanks (22a, 30a, 40a) to be received.
  3. Tool holder according to either of the preceding Claims 1 or 2, characterized in that at least two rotary drivers (14) are arranged opposite one another in the location bore (12).
  4. Tool holder according to one of the preceding claims, characterized in that locking bodies (20) are arranged in a region of the axial extent of the rotary drivers (14), which locking bodies (20), in their locking position, protrude by a cross-sectional region (x) beyond the area of projection of the rotary drivers (14), as viewed in the axial direction of the location bore.
  5. Tool holder according to one of the preceding claims, characterized in that the locking bodies (20) are mounted in an elastically yielding manner relative to an action of a tool shank (22a) which can be inserted from the open end of the tool holder (10).
  6. Tool holder according to one of the preceding claims, characterized in that the axial locking bodies (20), in the locked position, reach into the location bore (12) to a different distance depending on the shank diameter of the inserted tool (22, 30, 40, 50).
  7. Tool holder according to Claim 6, characterized in that the position of the axial locking bodies (20) is sensed by a sleeve or a sheet-metal ring (31) and utilized for setting the rotational speed of the drive motor of the hand power tool.
  8. Tool for use in drill chucks or in tool holders of hand-held drilling or percussion implements in particular according to Claim 1, having a shank (22a, 30a, 40a), any tool head and a shank end, the shank having grooves (23, 33, 43) which are at equal angular distances at its periphery and are open towards the shank end, characterized in that the grooves (23, 33, 43) have, on at least one side, a plurality of flat side walls (25, 35, 45) which are arranged in a stepped manner approximately radially to the tool axis (24) and are connected by strip-shaped sections (37, 47) running in the longitudinal direction of the shank.
  9. Tool according to Claim 8, characterized in that the grooves (33, 43) are stepped repeatedly, in which case the side walls (35, 45) and the sections (37, 47) connecting them, which are preferably in the shape of a cylindrical surface, form the steps.
  10. Tool according to Claim 8 or 9, characterized in that hollows (28) for receiving locking bodies (20) are formed in a region of the axial extent of the grooves (23, 33, 43), which hollows form a widened portion of the grooves (23, 33, 43).
EP92920854A 1991-09-26 1992-09-24 Device fitted on hand power tools Expired - Lifetime EP0605602B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4132023 1991-09-26
DE4132023A DE4132023A1 (en) 1991-09-26 1991-09-26 FITTING ON HAND MACHINE TOOLS
PCT/DE1992/000820 WO1993005929A1 (en) 1991-09-26 1992-09-24 Device fitted on hand power tools

Publications (2)

Publication Number Publication Date
EP0605602A1 EP0605602A1 (en) 1994-07-13
EP0605602B1 true EP0605602B1 (en) 1996-07-17

Family

ID=6441528

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Application Number Title Priority Date Filing Date
EP92920854A Expired - Lifetime EP0605602B1 (en) 1991-09-26 1992-09-24 Device fitted on hand power tools

Country Status (8)

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US (2) US5474139A (en)
EP (1) EP0605602B1 (en)
JP (1) JP3253618B2 (en)
AT (1) ATE140414T1 (en)
DE (2) DE4132023A1 (en)
DK (1) DK0605602T3 (en)
ES (1) ES2090693T3 (en)
WO (1) WO1993005929A1 (en)

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Also Published As

Publication number Publication date
US5474139A (en) 1995-12-12
JP3253618B2 (en) 2002-02-04
ES2090693T3 (en) 1996-10-16
EP0605602A1 (en) 1994-07-13
ATE140414T1 (en) 1996-08-15
DE59206789D1 (en) 1996-08-22
DE4132023A1 (en) 1993-04-01
DK0605602T3 (en) 1996-11-25
WO1993005929A1 (en) 1993-04-01
US5706903A (en) 1998-01-13
JPH06510710A (en) 1994-12-01

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