EP0134975B1 - Tool holding fixture, especially for screw driver bits - Google Patents

Tool holding fixture, especially for screw driver bits Download PDF

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Publication number
EP0134975B1
EP0134975B1 EP84107851A EP84107851A EP0134975B1 EP 0134975 B1 EP0134975 B1 EP 0134975B1 EP 84107851 A EP84107851 A EP 84107851A EP 84107851 A EP84107851 A EP 84107851A EP 0134975 B1 EP0134975 B1 EP 0134975B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
ball
lobe
wing
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84107851A
Other languages
German (de)
French (fr)
Other versions
EP0134975A1 (en
Inventor
Karl Lieser
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.)
Wera Werk Hermann Werner GmbH and Co KG
Original Assignee
Wera Werk Hermann Werner GmbH and Co KG
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 Wera Werk Hermann Werner GmbH and Co KG filed Critical Wera Werk Hermann Werner GmbH and Co KG
Priority to AT84107851T priority Critical patent/ATE29977T1/en
Publication of EP0134975A1 publication Critical patent/EP0134975A1/en
Application granted granted Critical
Publication of EP0134975B1 publication Critical patent/EP0134975B1/en
Expired 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
    • Y10S279/905—Quick change socket with ball detent
    • 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
    • Y10T279/17666—Radially reciprocating jaws
    • Y10T279/17692—Moving-cam actuator
    • Y10T279/17743—Reciprocating cam sleeve
    • Y10T279/17752—Ball or roller jaws
    • 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
    • Y10T279/17761—Side detent
    • Y10T279/17811—Reciprocating sleeve
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/94—Tool-support
    • Y10T408/95—Tool-support with tool-retaining means

Definitions

  • the invention relates to a chuck for non-circular shaft ends of tool inserts, in particular screwdriver bits, with a sleeve corresponding to the non-circular cross-section in its cavity and a ball acting on the shaft, which is assigned a sleeve which is displaceable against spring action in such a way that one towards the free end downward wedge-shaped clamping surface presses on the ball, the sleeve which can be shifted to the release position in the insertion direction of the shaft receives the ball in a projecting wing and the clamping surface sits on the inner flank of an end ring comprising the edge of the sleeve and the wing.
  • the sleeve can only be displaced in the longitudinal direction of the chuck due to its connection to the wing and rotates with the rotation of the sleeve. Furthermore, only a limited torque can be transmitted to the tool insert with the known chuck, since the mechanical fixing of the insert shank is only designed for normal load cases due to the wing extending to the lower edge of the chuck.
  • the object of the invention is based on the object of developing a chuck of this type in such a way that, with the same size, a higher torque can be transmitted with improved adjustment and handling.
  • the sleeve is provided with a recess which is delimited near the opening of the cavity by an annular zone, the inner surface of which corresponds to the inner surface of the other cavity, that the wing is slidably guided in the recess, which is relatively represents part movable to the sleeve, wherein the wing is acted on the one hand by the spring and that on the other hand stops are provided such that the wing can be moved by the sleeve against the force of the spring.
  • a chuck is specified, which is distinguished on the one hand by a more stable design and on the other hand by improved handling.
  • the wing has an outwardly directed tab which engages over an inwardly directed shoulder of the sleeve and forms part of the support surface for the sleeve spring.
  • the shoulder takes the tab and thus the wing, the ball of which comes into a release position.
  • the sleeve spring After releasing the sleeve, the sleeve spring returns the sleeve and the wing to the basic position. The assembly can be carried out very easily. For the time being, the sleeve spring is pushed onto the sleeve.
  • the wing is inserted in such a way that part of the sleeve spring is supported on the outwardly directed tab of the wing.
  • the sleeve is to be pushed open at this point and the end ring is to be clamped.
  • the chuck has a bushing 1 continuing at its upper end into a clamping pin 2. From the free end 1 'of the bushing 1, a hollow 3 with a non-circular cross section is incorporated. In the present case, it is a hexagonal cross section which is adapted to that of the shaft 4 of a screwdriver bit 5. Regarding the latter, it is one for Phillips screws.
  • the end 1 'of the sleeve 1 opposite the clamping shaft 2 is stepped.
  • a shoulder 6 is produced, on which one end of a helical compression spring 7 supported on the end 1 'is supported.
  • the other end of this finds a stop on an inwardly directed shoulder 8 of a sleeve 9 which is arranged on the bush 1 both longitudinally displaceably and rotatably.
  • a part of the supporting surface for this other end of the helical compression spring 7 is formed by a outwardly directed tab 20 of a wing 10 ", which According to the flap 20, spring loading occurs against the shoulder 8.
  • the latter connects two guide surfaces F and F 1 of the sleeve 9 of different sizes.
  • One guide surface F 1 slides on the stepped end 1 'of the sleeve, while the other guide surface F crosses the larger part the can includes.
  • the wing 10 ′′ coupled with the sleeve 9 is designed in the form of a segment in cross section in such a way that its inner flat surface 10 ′ is flush with a flank of the cavity 3.
  • the end 1 ′ of the bush 1 is provided with a recess 11 ′. provided so that the wing 10 "with the remaining cross-section of the end 1 'at the same height complements to a circular shape, see Fig. 4.
  • the length of the recess 11' is greater than the length of the wing 10".
  • the recess 11 ' ends at a distance from the free end edge of the end 1', so that the sleeve 1 forms a ring zone Z which has a cross-section beyond the wing 10 ".
  • wing 10 ′′ there is a bearing bore 12 arranged transversely to the longitudinal direction of the sleeve 9 for receiving a ball 13.
  • the diameter of the ball 13 is larger than the thickness of the wing 10 ′′ lying in the radial direction. Falling out of the ball 13 from the bearing bore 12 is prevented by an inward edge R. However, it is ensured that the ball 13 has sufficient play in the radial direction.
  • the inner flank 3 'of the ring zone Z has a polygonal shape, in an angular position to the polygonal surfaces of the cavity 3, so that this also gives an enlarged contact surface for the shaft 4 of the screwdriver bit 5.
  • the end ring 14 forms an inner clamping surface 15 which slopes in a wedge shape towards the free end and with which it presses against the ball 13.
  • the clamping surface 15 continues via a step 16 into a cavity 17 which is adapted to the outer circumference of a stepped free end 9 'of the sleeve 9 while allowing the sleeve 9 to move freely.
  • the shoulder 8 of the sleeve 9 acts on the tab 20 of the wing 10 ′′ and takes it with the ball 13 therein, which then comes out of the clamping position between the clamping surface 15 and the shaft 4, see FIG. 5.
  • the screwdriver bit 5 can If the screwdriver bit 5 has been removed, the compression spring 7 returns the sleeve together with the wing 10 "to the basic position, the sleeve 9 stepping against the upper end edge 14 'of the end ring 14 with a step 18'.
  • the tab 20 then acts on the shoulder 8.
  • the wing When the screwdriver bit 5 is inserted, the wing can still be displaced by a certain amount within the recess 11 'in the direction of the ring zone Z with the effect of a re-tensioning effect. Accordingly, when the screwdriver bit 5 is inserted, the tab 20 also lies at a short distance in front of the shoulder 8 of the sleeve 9.

Abstract

A chuck for non-circular ends of tool shanks having a bushing forming a chamber corresponding in cross-section to the tool shank and a ball which acts on the shank and is clamped by a spring biased sleeve which forms a wedge against the ball. The ball is mounted in a separate wing which is engaged by the sleeve and is displaceable relative to the bushing so that the ball engages a clamping surface formed by an end ring and the tool shank in a clamping position.

Description

Die Erfindung betrifft ein Spannfutter für unrund gestaltete Schaftenden von Werkzeug-Einsatzstücken, insbesondere Schraubendreherbits, mit einer in ihrer Höhlung dem unrunden Querschnitt entsprechenden Büchse und einer auf den Schaft einwirkenden Kugel, welcher eine entgegen Federwirkung verschiebbare Hülse zugeordnet ist derart, daß eine zum freien Ende hin keilförmig abfallende Spannfläche auf die Kugel drückt, wobei die zum Übertritt in die Freigabestellung in Einsteckrichtung des Schaftes verlagerbare Hülse in einem vorstehenden Flügel die Kugel aufnimmt und die Spannfläche an der Innenflanke eines den Rand der Büchse und den Flügel umfassenden Endringes sitzt.The invention relates to a chuck for non-circular shaft ends of tool inserts, in particular screwdriver bits, with a sleeve corresponding to the non-circular cross-section in its cavity and a ball acting on the shaft, which is assigned a sleeve which is displaceable against spring action in such a way that one towards the free end downward wedge-shaped clamping surface presses on the ball, the sleeve which can be shifted to the release position in the insertion direction of the shaft receives the ball in a projecting wing and the clamping surface sits on the inner flank of an end ring comprising the edge of the sleeve and the wing.

Aus der DE-A1-3 243 389 (veröffentlicht am 24.5.1984) ist ein Spannfutter der eingangs genannten Art bekannt, bei dem die Hülse zur Freigabe des Werkzeug-Einsatzstückes in Einsteckrichtung des Einsatzstückes verlagert werden muß. Der Vorteil einer solchen Ausgestaltung besteht im wesentlichen darin, daß beim Verlagern der Hülse auch bei unzureichend festem Sitz des Spannfutters in der Halterung einer Bohrmaschine das Spannfutter nicht aus der Halterung herausbewegt wird. Bei der bekannten Ausbildung des Spannfutters ist der Flügel einstückig mit der Hülse verbunden. Da der Flügel einem den unrunden Querschnitt der Büchse formenden Segment entspricht, läßt sich die Hülse aufgrund ihrer Verbindung mit dem Flügel ausschließlich in Längsrichtung tles Spannfutters verlagern und dreht beim Umlauf der Büchse mit. Ferner kann mit dem bekannten Spannfutter nur ein begrenztes Drehmoment auf das Werkzeug-Einsatzstück übertragen werden, da die mechanische Festlegung des Einsatzstückschaftes aufgrund des sich bis zum unteren Rand des Spannfutters erstreckenden Flügels nur für normale Belastungsfälle ausgelegt ist.From DE-A1-3 243 389 (published on May 24, 1984) a chuck of the type mentioned is known, in which the sleeve has to be displaced in the direction of insertion of the insert in order to release the tool insert. The advantage of such a configuration consists essentially in the fact that when the sleeve is displaced even if the chuck is inadequately tight in the holder of a drilling machine, the chuck is not moved out of the holder. In the known design of the chuck, the wing is integrally connected to the sleeve. Since the wing corresponds to a segment that forms the non-circular cross section of the sleeve, the sleeve can only be displaced in the longitudinal direction of the chuck due to its connection to the wing and rotates with the rotation of the sleeve. Furthermore, only a limited torque can be transmitted to the tool insert with the known chuck, since the mechanical fixing of the insert shank is only designed for normal load cases due to the wing extending to the lower edge of the chuck.

Dem Gegenstand der Erfindung liegt die Aufgabe zugrunde, ein Spannfutter dieser Gattung dahingehend weiterzubilden, daß bei gleicher Größe ein höheres Drehmoment übertragbar ist bei verbesserter Justierung und Handhabung.The object of the invention is based on the object of developing a chuck of this type in such a way that, with the same size, a higher torque can be transmitted with improved adjustment and handling.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Büchse mit einer Aussparung versehen ist, die nahe der Öffnung der Höhlung von einer Ringzone begrenzt ist, deren Innenfläche der Innenfläche der übrigen Höhlung entspricht, daß in der Aussparung der Flügel verschiebbar geführt ist, der einen relativ zur Hülse beweglichen Teil darstellt, wobei der Flügel einerseits von der Feder beaufschlagt ist und daß andererseits Anschläge derart vorgesehen sind, daß der Flügel von der Hülse entgegen der Kraft der Feder bewegbar ist. Zufolge derartiger Ausgestaltung ist ein Spannfutter angegeben, weiches sich einerseits durch eine stabilere Bauform und andererseits durch eine verbesserte Handhabung auszeichnet. Die stabilere Bauform resultiert daraus, daß die Büchse jenseits ihrer den Flügel aufnehmenden Aussparung geschlossen ist unter Bildung der durchlaufenden, vom Endring umfaßten Ringzone. Daher vermag das Spannfutter höhere Drehmomente gefahrlos zu übertragen. Auch ist die Angriffsfläche für den Endring durch die Ringzone vergrößert unter Erzielung eines verbesserten Sitzes desselben an der Büchse. Da die Innenfläche der Ringzone der Innenfläche der übrigen Höhlung entspricht, ergibt sich ein stabiler Sitz des Werkzeug-Einsatzstückes in der Büchse selbst. Da Flügel und Hülse nun zweiteilig sind, vermag sich die Hülse relativ zur Büchse zu verdrehen. Dieses bringt Vorteile bei der Justierung, also beim Ansetzen des Schraubendreherbits an der Schraube, da mit der einen Hand die Hülse gehalten werden kann, während hierzu die Büchse mit in ihr sitzendem Schraubendreherbit umläuft.This object is achieved in that the sleeve is provided with a recess which is delimited near the opening of the cavity by an annular zone, the inner surface of which corresponds to the inner surface of the other cavity, that the wing is slidably guided in the recess, which is relatively represents part movable to the sleeve, wherein the wing is acted on the one hand by the spring and that on the other hand stops are provided such that the wing can be moved by the sleeve against the force of the spring. As a result of such a configuration, a chuck is specified, which is distinguished on the one hand by a more stable design and on the other hand by improved handling. The more stable design results from the fact that the sleeve is closed beyond its recess receiving the wing, forming the continuous ring zone encompassed by the end ring. The chuck can therefore safely transmit higher torques. The area of attack for the end ring through the ring zone is also increased, with the result that the ring is better seated on the bushing. Since the inner surface of the ring zone corresponds to the inner surface of the rest of the cavity, the tool insert piece sits stably in the sleeve itself. Since the wing and sleeve are now in two parts, the sleeve can twist relative to the sleeve. This brings advantages in the adjustment, that is to say when the screwdriver bit is attached to the screw, since the sleeve can be held with one hand while the sleeve rotates with the screwdriver bit seated in it.

Schließlich erweist es sich noch als günstig, daß der Flügel einen auswärts gerichteten Lappen besitzt, der eine einwärts gerichtete Schulter der Hülse übergreift und einen Teil der Stützfläche für die Hülsenfeder formt. Bei einer Verlagerung der Hülse zwecks einer Freigabe des eingesetzten Schraubendreherbits nimmt die Schulter den Lappen und damit den Flügel mit, deren Kugel in eine Freigabestellung gelangt. Nach Loslassen der Hülse bringt die Hülsenfeder die Hülse und den Flügel in die Grundstellung zurück. Die Montage läßt sich sehr einfach vornehmen. Vorerst wird die Hülsenfeder auf die Büchse aufgeschoben. Danach erfolgt das Einsetzen des Flügels derart, daß sich dabei ein Teil der Hülsenfeder an dem auswärts gerichteten Lappen des Flügels abstützt. Hieran ist die Hülse aufzuschieben und der Endring in Klemmsitz zu bringen.Finally, it proves to be favorable that the wing has an outwardly directed tab which engages over an inwardly directed shoulder of the sleeve and forms part of the support surface for the sleeve spring. When the sleeve is displaced for the purpose of releasing the screwdriver bit used, the shoulder takes the tab and thus the wing, the ball of which comes into a release position. After releasing the sleeve, the sleeve spring returns the sleeve and the wing to the basic position. The assembly can be carried out very easily. For the time being, the sleeve spring is pushed onto the sleeve. Then the wing is inserted in such a way that part of the sleeve spring is supported on the outwardly directed tab of the wing. The sleeve is to be pushed open at this point and the end ring is to be clamped.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der Fig. 1-5 erläutert. Es zeigt

  • Figur 1 eine Ansicht eines einen Schraubendreherbit aufnehmenden Spannfutters in größerem Maßstab,
  • Figur 2 in Übereinanderdarstellung die Einzelteile des Spannfutters,
  • Figur 3 in stark vergrößerter Darstellung einen Längsschnitt durch das Spannfutter mit eingesetztem Schraubendreherbit,
  • Figur 4 den Schnitt nach der Linie IV-IV in Fig. 3 und
  • Figur 5 eine der Fig. 3 entsprechende Darstellung, jedoch bei in Freigabestellung verlagerter Hülse.
An embodiment of the invention is explained below with reference to FIGS. 1-5. It shows
  • 1 shows a view of a chuck holding a screwdriver bit on a larger scale,
  • FIG. 2 shows the individual parts of the chuck in a stack,
  • FIG. 3 shows a greatly enlarged illustration of a longitudinal section through the chuck with the screwdriver bit inserted,
  • Figure 4 shows the section along the line IV-IV in Fig. 3 and
  • 5 shows a representation corresponding to FIG. 3, but with the sleeve displaced in the release position.

Das Spannfutter besitzt eine sich an ihrem oberen Ende in einen Einspannzapfen 2 fortsetzende Büchse 1. Vom freien Ende 1' der Büchse 1 her ist eine Höhlung 3 unrunden Querschnitts eingearbeitet. Im vorliegenden Fall handelt es sich um einen sechseckigen Querschnitt, der demjenigen des Schaftes 4 eines Schraubendreherbits 5 angepaßt ist. Bezüglich des letzteren handelt es sich um einen solchen für Kreuzschlitzschrauben.The chuck has a bushing 1 continuing at its upper end into a clamping pin 2. From the free end 1 'of the bushing 1, a hollow 3 with a non-circular cross section is incorporated. In the present case, it is a hexagonal cross section which is adapted to that of the shaft 4 of a screwdriver bit 5. Regarding the latter, it is one for Phillips screws.

Das dem Einspannschaft 2 gegenüberliegende Ende 1' der Büchse 1 ist stufenförmig abgesetzt. Hierdurch wird eine Schulter 6 erzeugt, an welcher sich das eine Ende einer auf dem Ende 1' sitzenden Schraubendruckfeder 7 abstützt. Das andere Ende derselben findet einen Anschlag an einer einwärts gerichteten Schulter 8 einer auf der Büchse 1 sowohl längsverschieblich als auch drehbar angeordneten Hülse 9. Einen Teil der Stützfläche für dieses andere Ende der Schraubendruckfeder 7 bildet ein ausärts gerichteter Lappen 20 eines Flügels 10", welcher Lappen 20 zufolge Federbelastung gegen die Schulter 8 tritt. Letztere verbindet zwei unterschiedlich große Führungsflächen F und F 1 der Hülse 9. Die eine Führungsfläche F 1 gleitet auf dem stufenförmig abgesetzten Ende 1' der Büchse, während die andere Führungsfläche F den im Querschnitt größeren Teil der Büchse umfaßt.The end 1 'of the sleeve 1 opposite the clamping shaft 2 is stepped. In this way, a shoulder 6 is produced, on which one end of a helical compression spring 7 supported on the end 1 'is supported. The other end of this finds a stop on an inwardly directed shoulder 8 of a sleeve 9 which is arranged on the bush 1 both longitudinally displaceably and rotatably. A part of the supporting surface for this other end of the helical compression spring 7 is formed by a outwardly directed tab 20 of a wing 10 ", which According to the flap 20, spring loading occurs against the shoulder 8. The latter connects two guide surfaces F and F 1 of the sleeve 9 of different sizes. One guide surface F 1 slides on the stepped end 1 'of the sleeve, while the other guide surface F crosses the larger part the can includes.

Der mit der Hülse 9 gekuppelte Flügel 10" ist im Querschnitt segmentförmig gestaltet derart, daß seine innenliegende ebene Fläche 10' mit einer Flanke der Höhlung 3 fluchtet. Um dies ermöglichen zu können, ist das Ende 1' der Büchse 1 mit einer Aussparung 11' versehen, so daß sich der Flügel 10" mit dem auf gleicher Höhe liegenden Restquerschnitt des Endes 1' zu einer Kreisform ergänzt, vergl. Fig. 4. Die Länge der Aussparung 11' ist dabei größer als die Länge des Flügels 10". Die Aussparung 11' endet jedoch mit Abstand vor dem freien Stirnrand des Endes 1', so daß die Büchse 1 jenseits des Flügels 10" eine im Querschnitt durchlaufende Ringzone Z ausbildet.The wing 10 ″ coupled with the sleeve 9 is designed in the form of a segment in cross section in such a way that its inner flat surface 10 ′ is flush with a flank of the cavity 3. In order to make this possible, the end 1 ′ of the bush 1 is provided with a recess 11 ′. provided so that the wing 10 "with the remaining cross-section of the end 1 'at the same height complements to a circular shape, see Fig. 4. The length of the recess 11' is greater than the length of the wing 10". The recess 11 ', however, ends at a distance from the free end edge of the end 1', so that the sleeve 1 forms a ring zone Z which has a cross-section beyond the wing 10 ".

In dem Flügel 10" befindet sich eine quer zur Längsrichtung der Hülse 9 angeordnete Lagerbohrung 12 zur Aufnahme einer Kugel 13. Der Durchmesser der Kugel 13 ist dabei größer als die in radialer Richtung liegende Dicke des Flügels 10". Ein Herausfallen der Kugel 13 aus der Lagerbohrung 12 wird durch einen einwärts gerichteten Rand R verhindert. Es ist jedoch gewährleistet, daß die Kugel 13 in radialer Richtung ein ausreichendes Spiel besitzt.In the wing 10 ″ there is a bearing bore 12 arranged transversely to the longitudinal direction of the sleeve 9 for receiving a ball 13. The diameter of the ball 13 is larger than the thickness of the wing 10 ″ lying in the radial direction. Falling out of the ball 13 from the bearing bore 12 is prevented by an inward edge R. However, it is ensured that the ball 13 has sufficient play in the radial direction.

Die Innenflanke 3' der Ringzone Z besitzt eine Mehrkantform, und zwar in winkelgerechter Lage zu den Mehrkantflächen der Höhlung 3, so daß hierdurch auch eine vergrößerte Anlagefläche für den Schaft 4 des Schraubendreherbits 5 gegeben ist.The inner flank 3 'of the ring zone Z has a polygonal shape, in an angular position to the polygonal surfaces of the cavity 3, so that this also gives an enlarged contact surface for the shaft 4 of the screwdriver bit 5.

k Sowohl die Ringzone Z der Büchse 1 als auch der Flügel 10" werden von einem Endring 14 umfaßt. Dieser ist im Klemmsitz auf der Ringzone Z und dem sich anschließenden Bereich des Endes 1' angeordnet, und zwar so, daß der Flügel 10" von diesem Klemmsitz nicht erfaßt ist, sondern seine freie Beweglichkeit behält. k Both the ring zone Z of the sleeve 1 and the wing 10 "are encompassed by an end ring 14. This is clamped on the ring zone Z and the adjoining region of the end 1 ', in such a way that the wing 10" of this clamp seat is not detected, but retains its free mobility.

Der Endring 14 bildet eine zum freien Ende hin keilförmig abfallende innenseitige Spannfläche 15 aus, mit welcher er gegen die Kugel 13 drückt. Die Spannfläche 15 setzt sich über eine Abstufung 16 in eine Höhlung 17 fort, die dem Außenumfang eines abgesetzten freien Endes 9' der Hülse 9 angepaßt ist unter Gewährung der freien Bewegbarkeit der Hülse 9.The end ring 14 forms an inner clamping surface 15 which slopes in a wedge shape towards the free end and with which it presses against the ball 13. The clamping surface 15 continues via a step 16 into a cavity 17 which is adapted to the outer circumference of a stepped free end 9 'of the sleeve 9 while allowing the sleeve 9 to move freely.

Befindet sich in der Höhlung 3 ein Schraubendreherbit 5, so wird dieser in seiner Lage dadurch gehalten, daß die Schraubendruckfeder 7 den Flügel 10" mit Hülse entgegen Einsteckrichtung des Schraubendreherbits verlagert. Hierbei stützt sich die Kugel 13 an der Spannfläche 15 des Endringes 14 ab und wird in radialer Einwärtsrichtung bewegt unter Ausübung eines Druckes auf den Schaft 4 des Schraubendreherbits 5. Tritt eine Zugkraft an diesem auf, so verstärkt sich die Klemmkraft.If there is a screwdriver bit 5 in the cavity 3, this is held in position by the helical compression spring 7 displacing the wing 10 "with the sleeve against the direction of insertion of the screwdriver bit. The ball 13 is supported on the clamping surface 15 of the end ring 14 and is moved in the radial inward direction while exerting a pressure on the shaft 4 of the screwdriver bit 5. If a tensile force occurs thereon, the clamping force increases.

Zum Abziehen des Schraubendreherbits 5 ist es erforderlich, die umfangseitig gerändelte Hülse 9 in Einsteckrichtung entgegen der Federkraft zu verlagern. Hierbei beaufschlagt die Schulter 8 der Hülse 9 den Lappen 20 des Flügels 10" und nimmt diesen mit einschließlich der in ihm befindlichen Kugel 13, die dann aus der Klemmstellung zwischen Spannfläche 15 und Schaft 4 gelangt, vergl. Fig. 5. Der Schraubendreherbit 5 kann dann leicht entnommen werden. Ist der Schraubendreherbit 5 entfernt worden, führt die Druckfeder 7 die Hülse nebst Flügel 10" in die Grundstellung zurück, wobei die Hülse 9 mit einer Abstufung 18' gegen den oberen Stirnrand 14' des Endringes 14 tritt. Der Lappen 20 beaufschlagt dann die Schulter 8.To remove the screwdriver bit 5, it is necessary to displace the circumferentially knurled sleeve 9 in the insertion direction against the spring force. Here, the shoulder 8 of the sleeve 9 acts on the tab 20 of the wing 10 ″ and takes it with the ball 13 therein, which then comes out of the clamping position between the clamping surface 15 and the shaft 4, see FIG. 5. The screwdriver bit 5 can If the screwdriver bit 5 has been removed, the compression spring 7 returns the sleeve together with the wing 10 "to the basic position, the sleeve 9 stepping against the upper end edge 14 'of the end ring 14 with a step 18'. The tab 20 then acts on the shoulder 8.

Bei eingestecktem Schraubendreherbit 5 kann sich der Flügel noch um ein bestimmtes Maß innerhalb der Aussparung 11' in Richtung der Ringzone Z verlagern unter Erzielung einer Nachspannwirkung. Bei eingesetztem Schraubendreherbit 5 liegt dementsprechend auch der Lappen 20 mit geringem Abstand vor der Schulter 8 der Hülse 9.When the screwdriver bit 5 is inserted, the wing can still be displaced by a certain amount within the recess 11 'in the direction of the ring zone Z with the effect of a re-tensioning effect. Accordingly, when the screwdriver bit 5 is inserted, the tab 20 also lies at a short distance in front of the shoulder 8 of the sleeve 9.

Claims (3)

1. A chuck for shank ends of non-round shape on tool inserts, in particular screwdriver bits, having a bush (1) which in the hollow (3) in it corresponds with the non-round cross-section and a ball (13) which acts upon the shank (4) and with which a sleeve (9) able to slide against spring action is associated in such a way that a clamping-face which slopes off in a wedge shape towards the free end presses against the ball (13), where the sleeve (9) which may be displaced in the direction of insertion of the shank (4) for the shift into the release position receives the ball (13) in a projecting lobe (10") and the clamping face is seated on the inner flank of an endring (14) which embraces the edge of the bush (1) and the lobe (10"), characterized in that the bush (1) is provided with a recess (11') which near the opening in the hollow (3) is bounded by an annular zone (Z) the inner face of which corresponds with the inner face of the rest of the hollow (3), that in the recess (11') the lobe (10") is guided to be able to shift and form a part movable relatively to the sleeve (9), where the lobe (10") is acted upon at one side by the spring (7), and that on the other side stops (shoulder 8, fin 20) are provided in such a way that the lobe (10") is movable by the sleeve (9) against the force of the spring (7).
2. A chuck as in Claim 1, characterised in that the lobe (10") has a fin (20) directed outwards, which overlaps an inwards directed shoulder (8) on the sleeve (9) and forms one part of the bearing area for the sleeve spring (7).
EP84107851A 1983-08-24 1984-07-05 Tool holding fixture, especially for screw driver bits Expired EP0134975B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84107851T ATE29977T1 (en) 1983-08-24 1984-07-05 CHUCK FOR TOOL INSERTS, ESPECIALLY SCREWDRIVER BITS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833330486 DE3330486A1 (en) 1983-08-24 1983-08-24 CHUCK FOR TOOL PIECES, IN PARTICULAR SCREWDRIVER BITS
DE3330486 1983-08-24

Publications (2)

Publication Number Publication Date
EP0134975A1 EP0134975A1 (en) 1985-03-27
EP0134975B1 true EP0134975B1 (en) 1987-09-30

Family

ID=6207295

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107851A Expired EP0134975B1 (en) 1983-08-24 1984-07-05 Tool holding fixture, especially for screw driver bits

Country Status (4)

Country Link
US (1) US4629375A (en)
EP (1) EP0134975B1 (en)
AT (1) ATE29977T1 (en)
DE (2) DE3330486A1 (en)

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US8381830B2 (en) 2009-05-05 2013-02-26 Black & Decker Inc. Power tool with integrated bit retention device

Also Published As

Publication number Publication date
EP0134975A1 (en) 1985-03-27
ATE29977T1 (en) 1987-10-15
DE3466486D1 (en) 1987-11-05
DE3330486A1 (en) 1985-03-07
DE3330486C2 (en) 1992-04-09
US4629375A (en) 1986-12-16

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