EP0483703B1 - Chuck for tool inserts, particularly for screwdriver bits - Google Patents

Chuck for tool inserts, particularly for screwdriver bits Download PDF

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Publication number
EP0483703B1
EP0483703B1 EP91118289A EP91118289A EP0483703B1 EP 0483703 B1 EP0483703 B1 EP 0483703B1 EP 91118289 A EP91118289 A EP 91118289A EP 91118289 A EP91118289 A EP 91118289A EP 0483703 B1 EP0483703 B1 EP 0483703B1
Authority
EP
European Patent Office
Prior art keywords
chuck
main body
locking plate
shank
pick
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
EP91118289A
Other languages
German (de)
French (fr)
Other versions
EP0483703A1 (en
Inventor
Wilfried Eimer
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.)
Willi Hahn GmbH and Co KG
Original Assignee
Willi Hahn GmbH and Co KG
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Filing date
Publication date
Application filed by Willi Hahn GmbH and Co KG filed Critical Willi Hahn GmbH and Co KG
Publication of EP0483703A1 publication Critical patent/EP0483703A1/en
Application granted granted Critical
Publication of EP0483703B1 publication Critical patent/EP0483703B1/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
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/0007—Connections or joints between tool parts
    • B25B23/0035—Connection means between socket or screwdriver bit and tool
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S279/00—Chucks or sockets
    • Y10S279/904—Quick change socket
    • 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
    • Y10T279/17863—Shouldered-tang holding
    • Y10T279/17871—Cap
    • 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
    • Y10T279/23—Chucks or sockets with magnetic or electrostatic means

Definitions

  • the invention relates to a chuck for tool inserts according to the preamble of claim 1.
  • a base body serving as a handle has a square receptacle for the square shaft of the tool.
  • a coupling sleeve is rotatably mounted and held axially.
  • the cap sleeve is formed on the end face with a locking plate which has a square opening, the cross section of which corresponds to the cross section of the shaft and the side length of which corresponds to the circular diameter of locking grooves which are arranged in the square shaft.
  • the angle of twist of the coupling sleeve is limited by a screw which penetrates an arc slot of the locking plate and is inserted into the base body between a position in which the opening of the locking plate is aligned with the cross-sectional profile of the receptacle and a position in which the opening of the locking plate against the cross-sectional profile of the receptacle is twisted.
  • the union sleeve is locked by a radially spring-loaded locking ball. If the union sleeve is turned to the position in which its opening comes to coincide with the receptacle, the shaft of the tool insert can be freely inserted or pulled out.
  • the locking tab engages in a locking groove in the shaft and locks it.
  • the twisting of the union sleeve between the two positions must be effected against the resistance of the locking ball. The shaft therefore does not lock itself automatically in the base body of the handle.
  • DE-A-38 29 331 describes a chuck for tool inserts, in which the tool insert used is held in a force-fitting manner by means of a self-locking ball, in that the ball is inserted between one of the six surfaces of the shank of the tool insert inserted into the chuck and the narrowing Wall surface of an axially displaceable sleeve is clamped.
  • the ball To remove the tool insert (bits), the ball must be relieved by moving the sleeve.
  • a disadvantage of chucks of this type is the use of a ball which can be displaced and clamped in the chuck, which makes complex construction necessary for the ball guide and the function of which can be impaired by impurities (such as foreign bodies) entering the chuck.
  • the invention has for its object to provide a chuck of the type mentioned above, which has a high operational reliability, is easy to use and is structurally simple.
  • the locking of the tool insert is effected with a locking plate which is inserted in a union sleeve, whereby the coupling sleeve is arranged rotatably about the axial axis of the chuck.
  • a breakthrough of the locking plate with the cross-sectional profile of the chuck receptacle coincides, so that the tool insert can be freely inserted into the receptacle or pulled out of it. If the sleeve is rotated into a locking position, the locking plate engages in the locking groove of the shaft, for. B.
  • the axial dimension of the chuck according to the invention is shorter than in the known chucks with axially displaceable elements, which makes it advantageously possible to shape the free end of the screwdriver bits longer.
  • the chuck has a clamping pin 2 on which a sleeve-shaped base body 4 is fastened (see FIG. 2).
  • a stop 6 is used in the base body 4, which serves to limit the insertion depth of the tool inserts.
  • This stop 6 can advantageously also consist of a magnet which is used to use the tool inserts, e.g. B. screwdriver bits to exert a magnetic force on the screw.
  • the base body 4 has a hexagon socket 8, the cross-sectional profile of which corresponds to the cross-section of the hexagonal shaft 10 or 30 of a screwdriver bit 11 or 28.
  • a sleeve 12 is rotatably seated on the base body 4, which extends beyond the base body 4 at both ends.
  • the coupling sleeve 12 engages over the clamping pin-side end of the base body 4 inwards up to the outer circumference of the clamping shaft 2.
  • a locking plate 14 rests on the insertion-side end face of the base body 4 and sits firmly in the coupling sleeve 12.
  • the locking plate 14 has a circular central opening 15, the inner circle diameter of which corresponds to the diameter of the locking groove 26 of the hexagonal shaft 10 of standardized tool inserts (DIN 3126 Form C).
  • the opening 15 is widened beyond its circular inner circumference by six essentially triangularly shaped, equidistantly arranged recesses 17 which correspond in profile to the hexagonal corners of the shank 10 and 30 of the tool insert.
  • a coil spring 16 sits on the clamping shaft 2 between the ends of the base body 4 and the coupling sleeve 12.
  • the two spring ends 18a and 18b of the coil spring 16 are each under the torsional force of the coil spring 16 on spring contact surfaces 20a and 20b, respectively, on the base body 4 or the sleeve 12 are recessed.
  • the angle of rotation between the base body 4 and the union sleeve 12 is limited by a radial pin 22 inserted into the base body 4, which engages in a slot 24 running in the union sleeve 12 in the circumferential direction (see FIG. 1).
  • the torsional tension of the helical spring 16 holds the pin 22 at a stop end of the slot 24.
  • the triangular recesses 17 of the locking plate 14 do not coincide with the profile corners of the hexagon socket 8 of the base body 4.
  • the base body 4 and the sleeve 12 can against the spring tension over the length of the slot 24 against each other manually into the other stop position from Pin 22 and slot 24 are rotated.
  • the recesses 17 of the locking plate 14 come to coincide with the profile corners of the hexagon receptacle 8.
  • tool inserts 11, z. B. screwdriver bits that have a locking groove 26 according to DIN 3126-C (Fig. 2).
  • Tool inserts 28 can also be used, the shank 30 of which is rounded from the active side to the area of such a locking groove 26 (FIG. 3).
  • the union sleeve 12 is rotated on the base body 4 against the spring action of the helical spring 16 in the release position (FIG. 4a), in which the breakthrough profile 36 of the locking plate 14 with the cross-sectional profile of the hexagon receptacle 8 Cover comes and the shaft 10 or 30 can be inserted through the locking plate 14 into the base body 4.
  • the screwdriver bit 11 inserted into the hexagon receptacle 8 is then held in a form-fitting manner by the locking plate 14 which snaps back into the locking position (FIG. 4b) by means of the spring force and engages in the locking groove 26.
  • the locking plate 14 bears against the rounded effective end 34 of the shaft 30.
  • the coupling sleeve 12 is rotated counter to the spring force until, in the release position (FIG. 4a), the breakthrough profile 36 of the locking plate 14 is aligned with the profile of the hexagon receptacle 8 of the base body 4. The tool insert 11 or 28 is then easily removable.
  • a slight inclination of the slot 24 against the plane perpendicular to the axis causes on the one hand that the locking plate 14 lifts off the end face of the base body 4 during rotation into the release position and the rotation is not impeded by friction.
  • the tool insert 11 or 28 is also relieved in this way.
  • the tool insert 11 or 28 is pressed slightly axially by the locking plate 14 axially into the hexagon receptacle 8 (in particular in the embodiment of FIG. 3) and axially fixed to the stop 6.
  • the outer surface of the sleeve 12 is shaped as a corrugated handle 38 so that the sleeve 12 can be easily rotated against the base body 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Gripping On Spindles (AREA)

Description

Die Erfindung betrifft ein Spannfutter für Werkzeugeinsätze gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a chuck for tool inserts according to the preamble of claim 1.

Ein solches Spannfutter ist aus der US-A-2 592 978 bekannt. Ein als Handgriff dienender Grundkörper weist eine vierkantige Aufnahme für den vierkantigen Schaft des Werkzeuges auf. An dem aufnahmeseitigen Ende des Grundkörpers ist eine Überwurfhülse drehbar gelagert und axial gehalten. Die Überwurfhülse ist stirnseitig mit einem Verriegelungsblättchen ausgebildet, welches einen vierkantigen Durchbruch aufweist, dessen Querschnitt dem Querschnitt des Schaftes entspricht und dessen Seitenlänge dem Kreisdurchmesser von Rastrillen entspricht, die in dem vierkantigen Schaft angeordnet sind. Der Verdrehwinkel der Überwurfhülse ist durch eine einen Kreisbogenschlitz des Verriegelungsblättchens durchsetzende, in den Grundkörper eingesetzte Schraube begrenzt zwischen einer Stellung, in welcher der Durchbruch des Verriegelungsblättchens mit dem Querschnittsprofil der Aufnahme fluchtet und einer Stellung, in welcher der Durchbruch des Verriegelungsblättchens gegen das Querschnittsprofil der Aufnahme verdreht ist. In beiden Endstellungen wird die Überwurfhülse durch eine radial federbelastete Rastkugel arretiert. Wird die Überwurfhülse in die Stellung verdreht, in welcher ihr Durchbruch mit der Aufnahme zur Deckung kommt, so kann der Schaft des Werkzeugeinsatzes frei eingesetzt oder herausgezogen werden. Wird die Überwurfhülse bei eingesetztem Schaft verdreht, so greift das Verriegelungsblättchen in eine Rastrille des Schaftes und verriegelt diesen. Das Verdrehen der Überwurfhülse zwischen den beiden Stellungen muß jeweils gegen den Widerstand der Rastkugel bewirkt werden. Der Schaft verriegelt sich daher nicht selbsttätig in dem Grundkörper des Griffes.Such a chuck is known from US-A-2 592 978. A base body serving as a handle has a square receptacle for the square shaft of the tool. At the receiving end of the base body, a coupling sleeve is rotatably mounted and held axially. The cap sleeve is formed on the end face with a locking plate which has a square opening, the cross section of which corresponds to the cross section of the shaft and the side length of which corresponds to the circular diameter of locking grooves which are arranged in the square shaft. The angle of twist of the coupling sleeve is limited by a screw which penetrates an arc slot of the locking plate and is inserted into the base body between a position in which the opening of the locking plate is aligned with the cross-sectional profile of the receptacle and a position in which the opening of the locking plate against the cross-sectional profile of the receptacle is twisted. In both end positions the union sleeve is locked by a radially spring-loaded locking ball. If the union sleeve is turned to the position in which its opening comes to coincide with the receptacle, the shaft of the tool insert can be freely inserted or pulled out. If the sleeve is rotated while the shaft is inserted, the locking tab engages in a locking groove in the shaft and locks it. The twisting of the union sleeve between the two positions must be effected against the resistance of the locking ball. The shaft therefore does not lock itself automatically in the base body of the handle.

Weiter ist in der DE-A-38 29 331 ein Spannfutter für Werkzeugeinsätze beschrieben, bei dem der eingesetzte Werkzeugeinsatz mittels einer selbsthemmenden Kugel kraftschlüssig festgehalten wird, indem die Kugel zwischen eine der sechs Flächen des in das Spannfutter eingesetzten Schaftes des Werkzeugeinsatzes und der sich verengenden Wandfläche einer in axialer Richtung verschieblichen Überwurfhülse geklemmt wird. Zum Entnehmen des Werkzeugeinsatzes (Bits) muß die Kugel durch Verschieben der Überwurfhülse entlastet werden.Furthermore, DE-A-38 29 331 describes a chuck for tool inserts, in which the tool insert used is held in a force-fitting manner by means of a self-locking ball, in that the ball is inserted between one of the six surfaces of the shank of the tool insert inserted into the chuck and the narrowing Wall surface of an axially displaceable sleeve is clamped. To remove the tool insert (bits), the ball must be relieved by moving the sleeve.

Ein Nachteil bei Spannfuttern dieser Art ist der Einsatz einer im Spannfutter verschiebbaren und klemmenden Kugel, die für die Kugelführung eine aufwendige Konstruktion notwendig macht und deren Funktion durch in das Spannfutter gelangende Verunreinigungen (wie z.B. Fremdkörper) beeinträchtigt werden kann.A disadvantage of chucks of this type is the use of a ball which can be displaced and clamped in the chuck, which makes complex construction necessary for the ball guide and the function of which can be impaired by impurities (such as foreign bodies) entering the chuck.

Nach DIN-Norm DIN 31 26-C ist es bekannt, Werkzeugeinsätze mit einem sechskantigen Schaft auszubilden, wobei in den Längskanten des sechskantigen Schaftes Kerben eingeformt sind, die eine Rastrille im Umfang des Schaftes bilden. Der sechskantige Schaft wird in der Sechskantaufnahme eines Spannfutters eingerastet, indem ein in der Sechskantaufnahme gelagerter Federring in diese Rastrille eingreift. Aus DE 35 38 675 A1 ist es dabei weiter bekannt, den sechskantigen Schaft des Werkzeugeinsatzes von der Werkzeugseite her bis zu dieser Rastrille abzudrehen, so daß der Federring des Spannfutters vor den abgedrehten sechskantigen Schaft greift.According to DIN standard DIN 31 26-C, it is known to design tool inserts with a hexagonal shank, with notches being formed in the longitudinal edges of the hexagonal shank, which form a locking groove in the circumference of the shank. The hexagonal shaft is snapped into the hexagon socket of a chuck by a spring ring mounted in the hexagon socket engaging in this locking groove. From DE 35 38 675 A1 it is also known to twist off the hexagonal shank of the tool insert from the tool side up to this locking groove, so that the spring ring of the chuck engages in front of the turned hexagonal shank.

Bei diesen Spannfuttern wird der Werkzeugeinsatz durch die Federwirkung des Federringes gehalten. Eine hohe Federkraft des Federringes behindert das Auswechseln des Werkzeugeinsatzes, während eine schwache Federkraft einen unzuverlässigen Halt des Werkzeugeinsatzes bedeutet. Außerdem führt auch eine Ermüdung des Federringes zu einer unzuverlässigen Befestigung des Werkzeugeinsatzes.With these chucks, the tool insert is held by the spring action of the spring ring. A high spring force of the spring ring hinders the replacement of the tool insert, while a weak spring force means that the tool insert is not reliably held. Fatigue of the spring washer also leads to an unreliable fastening of the tool insert.

Der Erfindung liegt die Aufgabe zugrunde, ein Spannfutter der oben genannten Art zu schaffen, das eine hohe Betriebszuverlässigkeit aufweist, einfach zu handhaben ist und konstruktiv einfach aufgebaut ist.The invention has for its object to provide a chuck of the type mentioned above, which has a high operational reliability, is easy to use and is structurally simple.

Diese Aufgabe wird erfindungsgemäß durch die im Anspruch 1 angegebenen Merkmale gelöst. Vorteilhafte Ausführungsbeispiele sind in den Unteransprüchen angegeben.This object is achieved by the features specified in claim 1. Advantageous exemplary embodiments are specified in the subclaims.

Bei dem erfindungsgemäßen Spannfutter wird die Verriegelung des Werkzeugeinsatzes mit einem Verriegelungsplättchen bewirkt, das in einer Überwurfhülse eingesetzt ist, wobei die Überwurfhülse um die Axialachse des Spannfutters drehbar angeordnet ist. In einer Freigabestellung der Überwurfhülse kommt ein Durchbruch des Verriegelungsplättchens mit dem Querschnittprofil der Aufnahme des Spannfutters zur Deckung, so daß der Werkzeugeinsatz frei in die Aufnahme eingeführt oder aus dieser herausgezogen werden kann. Wird die Überwurfhülse in eine Verriegelungsstellung gedreht, so greift das Verriegelungsplättchen in die Rastrille des Schaftes, z. B. in die bei Schraubendrehereinsätzen gemäß DIN 3126 Form C im Sechskantschaft vorhandene Rastrille oder vor den von der Wirkseite her entsprechend DE 35 38 675 A1 bis zu dieser Rastrille abgedrehten Schaft des Schraubendrehereinsatzes und wird in dieser Position mittels der Überwurfhülse, die federbelastet ist, gehalten. Dadurch ist die Anzahl der beweglichen Teile des Spannfutters minimiert. Weiterhin ist der Werkzeugeinsatz im Spannfutter ausschließlich formschlüssig arretiert, wodurch ein einseitig radial auf den Werkzeugeinsatz ausgeübter Druck und der Materialermüdung unterworfene federnde Klemmelemente vermieden werden. Da nur zwangsgeführte Elemente und keine frei beweglichen Klemmelemente (wie z. B. eine Klemmkugel) verwendet sind, kann die Betriebssicherheit und Zuverlässigkeit des Spannfutters weniger durch Verunreinigungen beeinträchtigt werden. Die Reduzierung der Bauteile erlaubt zudem eine einfache und damit kostengünstige Herstellung des Spannfutters.In the chuck according to the invention, the locking of the tool insert is effected with a locking plate which is inserted in a union sleeve, whereby the coupling sleeve is arranged rotatably about the axial axis of the chuck. In a release position of the coupling sleeve, a breakthrough of the locking plate with the cross-sectional profile of the chuck receptacle coincides, so that the tool insert can be freely inserted into the receptacle or pulled out of it. If the sleeve is rotated into a locking position, the locking plate engages in the locking groove of the shaft, for. B. in the case of screwdriver bits in accordance with DIN 3126 Form C in the hexagonal shaft or in front of the shaft of the screwdriver bit turned from the active side according to DE 35 38 675 A1 up to this locking groove and is held in this position by means of the union sleeve, which is spring-loaded . This minimizes the number of moving parts of the chuck. Furthermore, the tool insert in the chuck is only locked in a form-fitting manner, as a result of which resilient clamping elements which are exerted radially on the tool insert and are subjected to material fatigue are avoided. Since only positively driven elements and no freely movable clamping elements (such as a clamping ball) are used, the operational safety and reliability of the chuck can be less affected by contamination. The reduction in the number of components also allows the chuck to be manufactured simply and therefore cost-effectively.

Durch das Fixieren des Werkzeugeinsatzes mittels des verdrehbaren Verriegelungsplättchens ist das axiale Baumaß des erfindungsgemäßen Spannfutters kürzer als bei den bekannten Spannfuttern mit axial verschiebbaren Elementen, wodurch es vorteilhaft möglich ist, das freie Ende der Schraubendreherbits länger auszuformen.By fixing the tool insert by means of the rotatable locking plate, the axial dimension of the chuck according to the invention is shorter than in the known chucks with axially displaceable elements, which makes it advantageously possible to shape the free end of the screwdriver bits longer.

Nachfolgend wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels weiter erläutert. Es zeigen:

Figur 1
eine Seitenansicht eines ein Schraubendreherbit aufnehmenden Spannfutters,
Figur 2
einen Längsschnitt durch das Spannfutter mit eingesetztem Schraubendreherbit mit einer Rastrille,
Figur 3
einen Teillängsschnitt durch das Spannfutter mit eingesetztem Schraubendreherbit mit abgedrehtem Schaft,
Figur 4a
einen Querschnitt des Spannfutters entlang der Linie IV-IV in Figur 2 in der Freigabestellung und
Figur 4b
einen entsprechenden Querschnitt des Spannfutters in Verriegelungsstellung.
The invention is based on one in the drawing illustrated embodiment further explained. Show it:
Figure 1
2 shows a side view of a chuck receiving a screwdriver bit,
Figure 2
a longitudinal section through the chuck with inserted screwdriver bit with a locking groove,
Figure 3
a partial longitudinal section through the chuck with inserted screwdriver bit with turned shaft,
Figure 4a
a cross section of the chuck along the line IV-IV in Figure 2 in the release position and
Figure 4b
a corresponding cross section of the chuck in the locked position.

Das Spannfutter besitzt einen Einspannzapfen 2, auf dem ein hülsenförmiger Grundkörper 4 befestigt ist (s. Fig. 2). Im mittleren Bereich ist in dem Grundkörper 4 ein Anschlag 6 eingesetzt, der dazu dient, die Einstecktiefe der Werkzeugeinsätze zu begrenzen. Dieser Anschlag 6 kann vorteilhaft auch aus einem Magneten bestehen, der dazu dient, über die Werkzeugeinsätze, z. B. Schraubendreherbits, eine Magnetkraft auf die Schraube auszuüben. Im vorderen Bereich weist der Grundkörper 4 eine Sechskantaufnahme 8 auf, deren Querschnittprofil dem Querschnitt des sechskantigen Schaftes 10 bzw. 30 eines Schraubendreherbits 11 bzw. 28 entspricht.The chuck has a clamping pin 2 on which a sleeve-shaped base body 4 is fastened (see FIG. 2). In the central area, a stop 6 is used in the base body 4, which serves to limit the insertion depth of the tool inserts. This stop 6 can advantageously also consist of a magnet which is used to use the tool inserts, e.g. B. screwdriver bits to exert a magnetic force on the screw. In the front area, the base body 4 has a hexagon socket 8, the cross-sectional profile of which corresponds to the cross-section of the hexagonal shaft 10 or 30 of a screwdriver bit 11 or 28.

Auf dem Grundkörper 4 sitzt drehbar eine Überwurfhülse 12, die den Grundkörper 4 an beiden Enden überragt. Die Überwurfhülse 12 übergreift das spannzapfenseitige Ende des Grundkörpers 4 nach innen bis zum Außenumfang des Einspannschaftes 2. An der einsteckseitigen Stirnfläche des Grundkörpers 4 liegt ein Verriegelungsplättchen 14 an, das fest in der Überwurfhülse 12 sitzt. Das Verriegelungsplättchen 14 weist einen kreisrunden mittigen Durchbruch 15 auf, dessen innerer Kreisdurchmesser dem Durchmesser der Rastrille 26 des sechskantigen Schaftes 10 genormter Werkzeugeinsätze (DIN 3126 Form C) entspricht. Der Durchbruch 15 ist über seinen kreisförmigen Innenumfang hinaus durch sechs im wesentlichen dreieckig ausgeformte äquidistant angeordnete Ausnehmungen 17 aufgeweitet, die im Profil den Sechskantecken des Schaftes 10 bzw. 30 des Werkzeugeinsatzes entsprechen.A sleeve 12 is rotatably seated on the base body 4, which extends beyond the base body 4 at both ends. The coupling sleeve 12 engages over the clamping pin-side end of the base body 4 inwards up to the outer circumference of the clamping shaft 2. A locking plate 14 rests on the insertion-side end face of the base body 4 and sits firmly in the coupling sleeve 12. The locking plate 14 has a circular central opening 15, the inner circle diameter of which corresponds to the diameter of the locking groove 26 of the hexagonal shaft 10 of standardized tool inserts (DIN 3126 Form C). The opening 15 is widened beyond its circular inner circumference by six essentially triangularly shaped, equidistantly arranged recesses 17 which correspond in profile to the hexagonal corners of the shank 10 and 30 of the tool insert.

Zwischen den spannzapfenseitigen Enden des Grundkörpers 4 und der Überwurfhülse 12 sitzt eine Schraubenfeder 16 auf dem Einspannschaft 2. Die beiden Federenden 18a bzw. 18b der Schraubenfeder 16 liegen jeweils unter der Torsionskraft der Schraubenfeder 16 an Federanlageflächen 20a bzw. 20b an, die an dem Grundkörper 4 bzw. der Überwurfhülse 12 ausgespart sind. Der Verdrehwinkel zwischen dem Grundkörper 4 und der Überwurfhülse 12 wird durch einen in den Grundkörper 4 eingesetzten radialen Stift 22 begrenzt, der in einen in der Überwurfhülse 12 in Umfangsrichtung verlaufenden Schlitz 24 (s. Fig. 1) eingreift. Die Torsionsspannung der Schraubenfeder 16 hält den Stift 22 an einem Anschlagende des Schlitzes 24. In dieser Verriegelungsstellung kommen die dreieckigen Ausnehmungen 17 des Verriegelungsplättchens 14 nicht mit den Profilecken der Sechskantaufnahme 8 des Grundkörpers 4 zur Deckung. Der Grundkörper 4 und die Überwurfhülse 12 können gegen die Federspannung über die Länge des Schlitzes 24 gegeneinander manuell bis in die andere Anschlagstellung von Stift 22 und Schlitz 24 verdreht werden. In dieser Freigabestellung kommen die Ausnehmungen 17 des Verriegelungsplättchens 14 mit den Profilecken der Sechskantaufnahme 8 zur Deckung.A coil spring 16 sits on the clamping shaft 2 between the ends of the base body 4 and the coupling sleeve 12. The two spring ends 18a and 18b of the coil spring 16 are each under the torsional force of the coil spring 16 on spring contact surfaces 20a and 20b, respectively, on the base body 4 or the sleeve 12 are recessed. The angle of rotation between the base body 4 and the union sleeve 12 is limited by a radial pin 22 inserted into the base body 4, which engages in a slot 24 running in the union sleeve 12 in the circumferential direction (see FIG. 1). The torsional tension of the helical spring 16 holds the pin 22 at a stop end of the slot 24. In this locking position, the triangular recesses 17 of the locking plate 14 do not coincide with the profile corners of the hexagon socket 8 of the base body 4. The base body 4 and the sleeve 12 can against the spring tension over the length of the slot 24 against each other manually into the other stop position from Pin 22 and slot 24 are rotated. In this release position, the recesses 17 of the locking plate 14 come to coincide with the profile corners of the hexagon receptacle 8.

Zur Bestückung des Spannfutters eignen sich Werkzeugeinsätze 11, z. B. Schraubendreherbits, die eine Rastrille 26 nach DIN 3126-C aufweisen (Fig. 2). Auch können Werkzeugeinsätze 28 verwendet werden, deren Schaft 30 von der Wirkseite her bis zum Bereich einer solchen Rastrille 26 gerundet sind (Fig. 3). Zum Einstecken des Werkzeugeinsatzes 11 bzw. 28 in das Spannfutter wird die Überwurfhülse 12 auf dem Grundkörper 4 gegen die Federwirkung der Schraubenfeder 16 in die Freigabestellung (Fig. 4a) verdreht, in welcher das Durchbruchsprofil 36 des Verriegelungsplättchens 14 mit dem Querschnittsprofil der Sechskantaufnahme 8 zur Deckung kommt und der Schaft 10 bzw. 30 durch das Verriegelungsplättchen 14 hindurch in den Grundkörper 4 eingeführt werden kann. Das in die Sechskantaufnahme 8 eingesteckte Schraubendreherbit 11 wird dann durch das mittels der Federkraft in die Verriegelungsstellung (Fig. 4b) zurückschnappende Verriegelungsplättchen 14 formschlüssig gehalten, das in die Rastrille 26 eingreift. Bei Werkzeugeinsätzen 28, bei denen der Schaft axial bis an die Rastrille abgerundet ist, liegt das Verriegelungsplättchen 14 an dem abgerundeten wirkseitigen Ende 34 des Schaftes 30 an.To insert the chuck, tool inserts 11, z. B. screwdriver bits that have a locking groove 26 according to DIN 3126-C (Fig. 2). Tool inserts 28 can also be used, the shank 30 of which is rounded from the active side to the area of such a locking groove 26 (FIG. 3). To insert the tool insert 11 or 28 into the chuck, the union sleeve 12 is rotated on the base body 4 against the spring action of the helical spring 16 in the release position (FIG. 4a), in which the breakthrough profile 36 of the locking plate 14 with the cross-sectional profile of the hexagon receptacle 8 Cover comes and the shaft 10 or 30 can be inserted through the locking plate 14 into the base body 4. The screwdriver bit 11 inserted into the hexagon receptacle 8 is then held in a form-fitting manner by the locking plate 14 which snaps back into the locking position (FIG. 4b) by means of the spring force and engages in the locking groove 26. In the case of tool inserts 28 in which the shaft is rounded axially up to the latching groove, the locking plate 14 bears against the rounded effective end 34 of the shaft 30.

Zum Abziehen des Schraubendreherbits 11 bzw. 28 wird die Überwurfhülse 12 entgegen der Federkraft gedreht, bis in der Freigabestellung (Fig. 4a) das Durchbruchsprofil 36 des Verriegelungsplättchens 14 mit dem Profil der Sechskantaufnahme 8 des Grundkörpers 4 zur Deckung gebracht ist. Der Werkzeugeinsatz 11 bzw. 28 ist dann leicht entnehmbar.To remove the screwdriver bit 11 or 28, the coupling sleeve 12 is rotated counter to the spring force until, in the release position (FIG. 4a), the breakthrough profile 36 of the locking plate 14 is aligned with the profile of the hexagon receptacle 8 of the base body 4. The tool insert 11 or 28 is then easily removable.

Eine leichte Schrägstellung des Schlitzes 24 gegen die zur Achse senkrechte Ebene bewirkt einerseits, daß bei der Drehung in die Freigabestellung das Verriegelungsplättchen 14 von der Stirnfläche des Grundkörpers 4 abhebt und die Drehung nicht durch Reibung behindert wird. Ebenso wird hierdurch der Werkzeugeinsatz 11 bzw. 28 entlastet. Bei der Drehung in die Verriegelungsstellung wird andererseits der Werkzeugeinsatz 11 bzw. 28 durch das Verriegelungsplättchen 14 leicht axial in die Sechskantaufnahme 8 gedrückt (insbesondere in der Ausführungsform der Fig. 3) und axial an dem Anschlag 6 festgelegt.A slight inclination of the slot 24 against the plane perpendicular to the axis causes on the one hand that the locking plate 14 lifts off the end face of the base body 4 during rotation into the release position and the rotation is not impeded by friction. The tool insert 11 or 28 is also relieved in this way. When rotating into the locking position, on the other hand, the tool insert 11 or 28 is pressed slightly axially by the locking plate 14 axially into the hexagon receptacle 8 (in particular in the embodiment of FIG. 3) and axially fixed to the stop 6.

Die Außenmantelfläche der Überwurfhülse 12 ist als geriffelte Handhabe 38 ausgeformt, so daß die Überwurfhülse 12 bequem gegen den Grundkörper 4 verdreht werden kann.The outer surface of the sleeve 12 is shaped as a corrugated handle 38 so that the sleeve 12 can be easily rotated against the base body 4.

Claims (4)

  1. A chuck for tool inserts (11;28), which have a non-round shank (10,30), with a main body (4) having a non-round pick-up (8) for the shank (10;30) of the tool inserts (11;28), with an outer casing (12) axially positioned and mounted on the main body (4) so that it can turn against this and with a thin locking plate (14) firmly fixed to the outer casing (12) at the pick-up (8) end of the main body (4), wherein the locking plate (14) has a central opening (15), the circle-diameter of which corresponds to the diameter of a slotted groove (26) in the shank (10;30), wherein this circle-diameter is smaller than the diameter of the range of the non-round pick-up (8), wherein the opening (15) is extended by recesses (17) corresponding to the profile section of the pick-up (8) and wherein the outer casing (12) can be turned against the main body (4) between a release position in which the opening (15) of the locking plate (14) is matched to the profile section of the pick-up (8) and a lock position in which the locking plate (14) engages in the groove (26) in the shank (10;30), characterised in that the chuck has a spring (16) which exercises, within the range of the angle of twist of the outer casing (12), a torsional force on this outer casing (12) in the direction of the lock position.
  2. A tool insert according to claim 1, characterised in that the swing angle of the outer cover (12) against the main body (4) is restricted by means of a peg (22) and slot (24) to a turn between the release position and the lock position.
  3. A chuck according to claim 2, characterised in that the slot (24) is slightly tilted against a plane vertical to the axis of the chuck, so that, when turning into the release position, the outer casing (12) is pushed slightly forward axially on the main body (4).
  4. A chuck according to one of claims 1 to 3, characterised in that a magnet is inserted in the pick-up (8) of the main body (4) as a buffer (6) for the shank (10;30).
EP91118289A 1990-10-31 1991-10-26 Chuck for tool inserts, particularly for screwdriver bits Expired - Lifetime EP0483703B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9014997U 1990-10-31
DE9014997U DE9014997U1 (en) 1990-10-31 1990-10-31 Chucks for tool inserts, especially screwdriver bits

Publications (2)

Publication Number Publication Date
EP0483703A1 EP0483703A1 (en) 1992-05-06
EP0483703B1 true EP0483703B1 (en) 1995-05-03

Family

ID=6858903

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91118289A Expired - Lifetime EP0483703B1 (en) 1990-10-31 1991-10-26 Chuck for tool inserts, particularly for screwdriver bits

Country Status (4)

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US (1) US5195761A (en)
EP (1) EP0483703B1 (en)
DE (2) DE9014997U1 (en)
ES (1) ES2075298T3 (en)

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US5779404A (en) * 1994-05-02 1998-07-14 Jore; Matthew B. Reversible drill/driver tool
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Also Published As

Publication number Publication date
DE59105379D1 (en) 1995-06-08
US5195761A (en) 1993-03-23
DE9014997U1 (en) 1992-03-19
EP0483703A1 (en) 1992-05-06
ES2075298T3 (en) 1995-10-01

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