EP0432169B1 - A device on manual machine tools for torque transmission - Google Patents

A device on manual machine tools for torque transmission Download PDF

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Publication number
EP0432169B1
EP0432169B1 EP89908381A EP89908381A EP0432169B1 EP 0432169 B1 EP0432169 B1 EP 0432169B1 EP 89908381 A EP89908381 A EP 89908381A EP 89908381 A EP89908381 A EP 89908381A EP 0432169 B1 EP0432169 B1 EP 0432169B1
Authority
EP
European Patent Office
Prior art keywords
rotary drive
drive slots
plane
longitudinal plane
disposed
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
EP89908381A
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German (de)
French (fr)
Other versions
EP0432169A1 (en
Inventor
Josef Obermeier
Gerhard Rumpp
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
Priority to AT89908381T priority Critical patent/ATE96073T1/en
Publication of EP0432169A1 publication Critical patent/EP0432169A1/en
Application granted granted Critical
Publication of EP0432169B1 publication Critical patent/EP0432169B1/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
    • 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
    • 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
    • B25D2217/0049—Roll-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
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/907—Tool or Tool with support including detailed shank

Definitions

  • Device on hand-held power tools for torque transmission to impact drilling tools with two axially closed on both sides, diametrically opposite recesses, which interact with locking bodies, at least three open-ended rotary driving grooves for strip-shaped rotary drivers on both sides of a longitudinal plane running through the two recesses, which open out at the rear end of the tool shaft. which are arranged distributed over the circumference in such a way that in no case are two rotary driving grooves diametrically opposite one another.
  • a device of the type in question is known from DE-P 37 16 915.7.
  • the tool provided for this device has on both sides of its shaft closed, diametrically opposed recesses, both sides of which are provided with rotary driving grooves that open out towards the rear end of the tool shaft on a longitudinal plane running through these recesses.
  • the rotary driving grooves are arranged asymmetrically in such a way that no two are diametrically opposed to one another.
  • a device for torque transmission is known from FR-A 23 31 410, which, however, has diametrically opposed rotary driving or locking grooves of similar dimensions.
  • the invention is based on the object of designing a device on hand-held power tools for torque transmission in such a way that its parts can be produced economically, in particular by means of non-cutting forming processes.
  • this object is achieved in that the sum of the cross sections of the rotary driving grooves arranged on one side of the longitudinal plane essentially corresponds to the sum of the rotating driving grooves arranged on the other side of the longitudinal plane, and on each side of the longitudinal plane the rotating driving grooves are symmetrical to a perpendicular to the longitudinal plane Plane of symmetry are arranged and formed.
  • the forces to be applied in a non-cutting forming process are uniformly distributed. Due to the symmetry with respect to the plane of symmetry running perpendicular to the longitudinal plane, the force components in particular cancel each other out in the direction running parallel to the longitudinal plane. Due to the material cross-sections achieved by adapting the cross-sections and alignment with respect to the plane of symmetry, the force components cancel each other out perpendicular to each plane running through the longitudinal axis.
  • the number of rotary driving grooves on one side of the longitudinal plane is preferably greater than the number of rotary driving grooves on the other side, which has the advantage that the arrangement of the rotary driving grooves on both sides of the longitudinal plane differs sufficiently from one another, above all visually. This makes it easier for the operator of a hand-held power tool equipped in this way to insert tools.
  • all the rotary driving grooves are expediently of the same length.
  • a length adjustment with regard to the recesses is irrelevant, provided that these are also of equal length to one another.
  • a proven embodiment can be achieved in that the rotary driving grooves project slightly beyond the length of the rear end of the recesses.
  • the central web through which the symmetry plane passes through between two adjacent rotary driving grooves has an angle between 0 ° and 15 °. This avoids an undercut that would have an adverse effect both in terms of strength and from the point of view of the forming. In terms of strength, in particular, it is advantageous if the angle is greater than 0 °, so that sufficiently high torques can be transmitted to the central web formed by the residual profile.
  • the tool for the device according to the invention on hand tools for torque transmission is preferably designed such that the tool shaft has two axially closed, diametrically opposite recesses and with at least three open ends at the rear end of the tool shaft on both sides of a longitudinal plane running through the two recesses arranged rotary driving grooves are provided, which are distributed over the circumference such that in no case two rotating driving grooves are diametrically opposite one another and the sum of the cross sections of the rotating driving grooves arranged on one side of the longitudinal plane essentially corresponds to the sum of the rotating driving grooves arranged on the other side of the longitudinal plane and on each side
  • the longitudinal driving grooves are arranged and formed symmetrically to a plane of symmetry running perpendicularly through the longitudinal plane.
  • the tool holder shown in FIGS. 1 and 2 is arranged on a drilling device, for example on a hammer drill, with a housing 1.
  • a guide tube 2 is in the housing via a bearing 3 1 rotatably mounted.
  • a sealing ring 4 sliding on the guide tube 2 prevents dirt from penetrating into the bearing 3 on the one hand and lubricant from the housing 1 on the other hand.
  • a striker 5 is axially displaceably mounted in the guide tube 2.
  • a tool shaft 6 of a drilling tool is inserted into the free end 2a of the guide tube 2.
  • the tool shank 6 has two diametrically opposite recesses 6a which are axially closed on both sides, and rotational driving grooves 6c, 6d which are arranged offset with respect to these and open towards the rear end 6b. There is a central web 6e between the two rotary driving grooves 6d.
  • the guide tube 2 is provided with through openings 2b, into which roller-shaped locking elements 7 are inserted.
  • the guide tube 2 also has rotary drivers 2c, 2d which engage in the rotary driving grooves 6c, 6d and serve to transmit the torque from the guide tube 2 to the tool shank 6.
  • an adjusting sleeve 8 can be displaced axially to a limited extent against the force of a compression spring 9 guided in an extension 1a of the housing 1.
  • the adjusting sleeve 8 has a circumferential escape niche 8a for the locking body 7.
  • the escape niche 8a reaches the area of the passage openings 2b and the locking bodies 7 can move radially into the escape niche 8a, whereupon the tool shaft 6 can be pulled out of the guide tube 2.
  • the adjusting sleeve 8 is secured in the feed direction by means of a locking ring 10.
  • FIGS. 3 and 4 show a tool shank 16 which is somewhat enlarged compared to FIGS. 1 and 2, with axially closed recesses 16a and rotational driving grooves 16c, 16d which are open towards the rear end 16b.
  • the two recesses 16a lie diametrically opposite one another.
  • the recesses 16a are thus arranged symmetrically with respect to the plane of symmetry Y running through the longitudinal axis.
  • the central web 16e remaining between the two rotary driving grooves 16d has an angle A between 0 ° and 15 ° with respect to the plane of symmetry Y.
  • the tool shank 26 shown in FIGS. 5 and 6 differs from the embodiment shown in FIGS. 3 and 4 mainly by the number of rotary driving grooves 26c, 26d.
  • the bores 26a and the rotary driving grooves 26c, 26d are arranged and formed symmetrically with respect to the plane of symmetry Y.
  • This embodiment differs from the embodiment in FIGS. 3 and 4 in that the central webs 26e, 26f remaining between the rotary driving grooves 26c, 26d have flanks which are parallel to one another and have an angle with respect to the plane of symmetry Y of 0 °.
  • FIG. 7 and 8 show a fourth embodiment of a tool shank 36.
  • This tool shank 36 has two diametrically opposite recesses 36a.
  • the total number of rotary driving grooves 36c, 36d open towards the rear end 36b is five.
  • the sum of the cross sections of the rotary driving grooves 36c, 36d, 36f is the same on both sides of the longitudinal plane X.
  • the angle B of the central web 36e remaining between the rotary driving grooves 36c with respect to the plane of symmetry Y is, for example, approximately 5 °.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Earth Drilling (AREA)
  • Drilling Tools (AREA)
  • Drilling And Boring (AREA)

Abstract

The device on manual machine tools is designed for transmitting torque to percussion drills in that locking components (7) with recesses (6a) axially closed on both sides and cotters (2b, 2c) co-operate with keyways (6c, 6d) distributed around the periphery on the tool spindle (6). To prevent incorrect use, the keyways (6c, 6d) are so arranged that it is impossible for two keyways (6c, 6d) to be diametrically opposite each other. In order to be able to make the keyways (6c, 6d) economically by forging, the sum of the cross-sections of the keyways (6c, 6d) is equal on both sides of longitudinal plane (X) running through the recesses (6a) so that the same volume of material has to be forged on both sides of this longitudinal plane (X) and the forces generated are thus uniformly distributed.

Description

Einrichtung an Handwerkzeugmaschinen zur Drehmomentübertragung auf schlagbohrende Werkzeuge, mit zwei axial beidseitig geschlossenen, einander diametral gegenüberliegenden, mit Verriegelungskörpern zusammenwirkenden Ausnehmungen, mindestens drei am rückwärtigen Ende des Werkzeugschaftes offen ausmündenden, auf beiden Seiten einer durch die beiden Ausnehmungen verlaufenden Längsebene angeordneten Drehmitnahmenuten für leistenförmige Drehmitnehmer, die derart über den Umfang verteilt angeordnet sind, dass in keinem Fall zwei Drehmitnahmenuten einander diametral gegenüberliegen.Device on hand-held power tools for torque transmission to impact drilling tools, with two axially closed on both sides, diametrically opposite recesses, which interact with locking bodies, at least three open-ended rotary driving grooves for strip-shaped rotary drivers on both sides of a longitudinal plane running through the two recesses, which open out at the rear end of the tool shaft. which are arranged distributed over the circumference in such a way that in no case are two rotary driving grooves diametrically opposite one another.

Eine Einrichtung der in Rede stehenden Art ist aus der DE-P 37 16 915.7 bekannt. Das für diese Einrichtung vorgesehene Werkzeug weist an seinem Schaft beidseitig geschlossene, einander diametral gegenüberliegende Ausnehmungen auf, wobei beidseits einer durch diese Ausnehmungen verlaufenden Längsebene zum rückwärtigen Ende des Werkzeugschaftes hin offen ausmündende Drehmitnahmenuten vorgesehen sind. Um zu verhindern, dass die Werkzeuge falsch eingesetzt werden, sind die Drehmitnahmenuten derart asymmetrisch angeordnet, dass in keinem Falle zwei einander diametral gegenüberliegen.A device of the type in question is known from DE-P 37 16 915.7. The tool provided for this device has on both sides of its shaft closed, diametrically opposed recesses, both sides of which are provided with rotary driving grooves that open out towards the rear end of the tool shaft on a longitudinal plane running through these recesses. In order to prevent the tools from being inserted incorrectly, the rotary driving grooves are arranged asymmetrically in such a way that no two are diametrically opposed to one another.

Weiter ist aus der FR-A 23 31 410 eine Einrichtung zur Drehmomentübertragung bekannt, die jedoch jeweils diametral gegenüberliegende Drehmitnahme- bzw. Verriegelungsnuten ähnlicher Abmessungen aufweist. Bei den dort gewählten Nutkonfigurationen besteht insbesondere bei durch harte Beanspruchung ausgeschlagenen Nuten die Gefahr, daß sie in Hämmer mit Werkzeughaltern ohne feststehende Drehmitnehmer falsch eingesetzt werden und es zu Fehlverriegelungen kommt.Furthermore, a device for torque transmission is known from FR-A 23 31 410, which, however, has diametrically opposed rotary driving or locking grooves of similar dimensions. With the groove configurations selected there, especially in the case of grooves knocked out by hard stress, there is a risk that they will be inserted incorrectly in hammers with tool holders without a fixed rotary driver and that incorrect locking will occur.

Während mit dem aus der DE-P 17 16 915.7 bekannten Werkzeug die Anforderungen hinsichtlich Verwendung vollumfänglich erfüllt werden können, führt die asymmetrische Anordnung der Drehmitnahmenuten zu einer ungleichmäßigen Querschnittsaufteilung des Restquerschnittes des Werkzeugschaftes, insbesondere aus der Sicht der durch die Ausnehmungen verlaufenden Längsebene. Aufgrund dieser ungleichmäßigen Querschnittsaufteilung ist eine Herstellung insbesondere der Drehmitnahmenuten nur durch spanabhebende Formgebung möglich, was vor allem zu wirtschaftlichen Nachteilen in der Herstellung führt. Ein spanloses Umformen ist aufgrund der ungleichmäßig umzuformenden Volumen ohne anschließenden äußerst aufwendigen Richtprozess undenkbar.While with the tool known from DE-P 17 16 915.7 the requirements with regard to use can be fully met, the asymmetrical arrangement of the rotary driving grooves leads to an uneven cross-sectional distribution of the remaining cross-section of the tool shank, in particular from the point of view of the longitudinal plane running through the recesses. Due to this uneven cross-sectional division, the production of the rotary driving grooves in particular is only possible by machining, which leads above all to economic disadvantages in the production. Chipless forming is inconceivable due to the uneven volume to be formed without a subsequent extremely complex straightening process.

Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung an Handwerkzeugmaschinen zur Drehmomentübertragung derart zu Gestalten, dass sich ihre Teile wirtschaftlich, insbesondere mittels spanloser Umformverfahren, herstellen lassen.The invention is based on the object of designing a device on hand-held power tools for torque transmission in such a way that its parts can be produced economically, in particular by means of non-cutting forming processes.

Erfindungsgemäss wird diese Aufgabe dadurch gelöst, dass die Summe der Querschnitte der auf einer Seite der Längsebene angeordneten Drehmitnahmenuten im wesentlichen der Summe der auf der anderen Seite der Längsebene angeordneten Drehmitnahmenuten entspricht und auf jeder Seite der Längsebene die Drehmitnahmenuten symmetrisch zu einer senkrecht durch die Längsebene verlaufenden Symmetrieebene angeordnet und ausgebildet sind.According to the invention, this object is achieved in that the sum of the cross sections of the rotary driving grooves arranged on one side of the longitudinal plane essentially corresponds to the sum of the rotating driving grooves arranged on the other side of the longitudinal plane, and on each side of the longitudinal plane the rotating driving grooves are symmetrical to a perpendicular to the longitudinal plane Plane of symmetry are arranged and formed.

Es wird durch die erfindungsgemässe Anordnung der Drehmitnahmenuten erreicht, dass die bei einem spanlosen Umformverfahren aufzuwendenden Kräfte eine gleichmässige Aufteilung erfahren. Durch die Symmetrie bezüglich der senkrecht zur Längsebene verlaufenden Symmetrie-Ebene heben sich insbesondere auch die Kraftkomponenten in der parallel zur Längsebene verlaufenden Richtung gegenseitig auf. Aufgrund der durch die Anpassung der Querschnitte und Ausrichtung bezüglich Symmetrie-Ebene erzielten Materialquerschnitte heben sich die Kraftkomponenten senkrecht zu jeder durch die Längsachse verlaufenden Ebene gegenseitig auf.It is achieved by the arrangement of the rotary driving grooves according to the invention that the forces to be applied in a non-cutting forming process are uniformly distributed. Due to the symmetry with respect to the plane of symmetry running perpendicular to the longitudinal plane, the force components in particular cancel each other out in the direction running parallel to the longitudinal plane. Due to the material cross-sections achieved by adapting the cross-sections and alignment with respect to the plane of symmetry, the force components cancel each other out perpendicular to each plane running through the longitudinal axis.

Vorzugsweise ist die Anzahl der Drehmitnanmenuten auf der einen Seite der Längsebene grösser als die Anzahl der Drehmitnahmenuten auf der anderen Seite, was den Vorteil hat, dass sich die Anordnung der Drehmitnahmenuten beidseits der Längsebene, vor allem auch optisch voneinander ausreichend unterscheidet. Dadurch wird der Bedienungsperson einer derart ausgestatteten Handwerkzeugmaschine das Einsetzen von Werkzeugen erleichtert.The number of rotary driving grooves on one side of the longitudinal plane is preferably greater than the number of rotary driving grooves on the other side, which has the advantage that the arrangement of the rotary driving grooves on both sides of the longitudinal plane differs sufficiently from one another, above all visually. This makes it easier for the operator of a hand-held power tool equipped in this way to insert tools.

Aus der Sicht der Dimensionierung hinsichtlich Anordnung von Nuten und Ausnehmungen werden in bevorzugter Weise mit der Anordnung von drei Drehmitnahmenuten derart gute Verhältnisse erreicht, dass noch ein ausreichender, insbesondere der Führung dienender Restquerschnitt verbleibt.From the point of view of dimensioning with regard to the arrangement of grooves and recesses, such good conditions are preferably achieved with the arrangement of three rotary driving grooves that a sufficient, in particular the remaining cross-section serving as a guide remains.

Um hinsichtlich des Umformvorganges die Kräfte auch bei einem Längswalzen während des gesamten Umformvorganges gleichmässig aufzuteilen, sind zweckmässigerweise alle Drehmitnahmenuten gleich lang. Unerheblich ist dabei eine Längenabstimmung bezüglich der Ausnehmungen, sofern auch diese untereinander gleich lang sind. Insbesondere lässt sich eine bewährte Ausführungsform dadurch erzielen, dass die Drehmitnahmenuten das rückwärtige Ende der Ausnehmungen in ihrer Länge geringfügig überragen.In order to distribute the forces evenly during longitudinal rolling during the entire forming process with regard to the forming process, all the rotary driving grooves are expediently of the same length. A length adjustment with regard to the recesses is irrelevant, provided that these are also of equal length to one another. In particular, a proven embodiment can be achieved in that the rotary driving grooves project slightly beyond the length of the rear end of the recesses.

Vorzugsweise weist der zwischen zwei einander benachbarten Drehmitnahmenuten von der Symmetrie-Ebene durchsetzte Mittelsteg zur Symmetrie-Ebene einen Winkel zwischen 0° und 15° auf. Dadurch wird ein Hinterschnitt, welcher sich sowohl festigkeitsmässig als auch aus der Sicht der Umformung nachteilig auswirken würde, vermieden. Insbesondere ist es in festigkeitsmässiger Hinsicht vorteilhaft, wenn der Winkel grösser als 0° ist, so dass ausreichend hohe Drehmomente auf den sich durch das Restprofil bildenden Mittelsteg übertragen lassen.Preferably, the central web through which the symmetry plane passes through between two adjacent rotary driving grooves has an angle between 0 ° and 15 °. This avoids an undercut that would have an adverse effect both in terms of strength and from the point of view of the forming. In terms of strength, in particular, it is advantageous if the angle is greater than 0 °, so that sufficiently high torques can be transmitted to the central web formed by the residual profile.

Das Werkzeug für die erfindungsgemässe Einrichtung an Handwerkzeugen zur Drehmomentübertragung ist vorzugsweise derart ausgebildet, dass der Werkzeugschaft zwei axial beidseitig geschlossene, einander diametral gegenüberliegende Ausnehmungen aufweist und mit mindestens drei am rückwärtigen Ende des Werkzeugschaftes offen ausmündenden, auf beiden Seiten einer durch die beiden Ausnehmungen verlaufenden Längsebene angeordneten Drehmitnahmenuten vorsehen ist, die derart über den Umfang verteilt sind, dass in keinem Fall zwei Drehmitnahmenuten einander diametral gegenüberliegen und die Summe der Querschnitte der auf einer Seite der Längsebene angeordneten Drehmitnahmenuten im wesentlichen der Summe der auf der anderen Seite der Längsebene angeordneten Drehmitnahmenuten entspricht und auf jeder Seite der Längsebene die Drehmitnahmenuten symmetrisch zu einer senkrecht durch die Längsebene verlaufenden Symmetrie-Ebene angeordnet und ausgebildet sind.The tool for the device according to the invention on hand tools for torque transmission is preferably designed such that the tool shaft has two axially closed, diametrically opposite recesses and with at least three open ends at the rear end of the tool shaft on both sides of a longitudinal plane running through the two recesses arranged rotary driving grooves are provided, which are distributed over the circumference such that in no case two rotating driving grooves are diametrically opposite one another and the sum of the cross sections of the rotating driving grooves arranged on one side of the longitudinal plane essentially corresponds to the sum of the rotating driving grooves arranged on the other side of the longitudinal plane and on each side The longitudinal driving grooves are arranged and formed symmetrically to a plane of symmetry running perpendicularly through the longitudinal plane.

Die Erfindung soll nachstehend, anhand der sie beispielsweisewiedergebenden Zeichnungen näher erläutert werden. Es zeigen:

Fig. 1
einen an einem Bohrhammer angeordneten Werkzeughalter mit eingeführtem Werkzeug, im Längsschnitt entlang der Linie I-I der Fig. 3;
Fig. 2
einen Querschnitt durch den in Fig. 1 dargestellten Werkzeughalter, entlang der Linie II-II;
Fig. 3
einen Werkzeugschaft mit 3 Drehmitnahmenuten,
Fig. 4
einen Querschnitt durch den in Fig. 3 dargestellten Werkzeugschaft, entlang der Linie IV-IV;
Fig. 5
einen weiteren Werkzeugschaft eines Werkzeuges mit vier Drehmitnahmenuten;
Fig. 6
einen Querschnitt durch den in Fig. 5 dargestellten Werkzeugschaft, entlang der Linie VI-VI,
Fig. 7
einen Werkzeugschaft eines Werkzeuges mit fünf Drehmitnahmenuten;
Fig. 8
einen Querschnitt durch den in Fig. 7 dargestellten Werkzeugschaft, entlang der Linie VIII-VIII.
The invention will be explained in more detail below with reference to the drawings, for example. Show it:
Fig. 1
a arranged on a hammer drill tool holder with inserted tool, in longitudinal section along the line II of Fig. 3;
Fig. 2
a cross section through the tool holder shown in Figure 1, along the line II-II.
Fig. 3
a tool shank with 3 rotary driving grooves,
Fig. 4
a cross section through the tool shank shown in Figure 3, along the line IV-IV.
Fig. 5
another tool shank of a tool with four rotary driving grooves;
Fig. 6
5 shows a cross section through the tool shank shown in FIG. 5, along the line VI-VI,
Fig. 7
a tool shank of a tool with five rotary driving grooves;
Fig. 8
a cross section through the tool shank shown in Fig. 7, along the line VIII-VIII.

Der aus Fig. 1 und 2 ersichtliche Werkzeughalter ist an einem Bohrgerät, beispielsweise an einem Bohrhammer, mit einem Gehäuse 1 angeordnet. Ein Führungsrohr 2 ist über ein Lager 3 im Gehäuse 1 drehbar gelagert. Ein auf dem Führungsrohr 2 gleitender Dichtring 4 verhindert einerseits das Eindringen von Verschmutzungen zum Lager 3 und andererseits das Austreten von Schmiermittel aus den Gehäuse 1. Im Führungsrohr 2 ist ein Döpper 5 axial verschiebbar gelagert. In das freie Ende 2a des Führungsrohres 2 ist ein Werkzeugschaft 6 eines Bohrwerkzeuges eingesetzt. Der Werkzeugschaft 6 weist zwei einander diametral gegenüberliegende, axial beidseitig geschlossene Ausnehmungen 6a sowie gegenüber diesen versetzt angeordnete, zum rückwärtigen Ende 6b hin offene Drehmitnahmenuten 6c, 6d auf. Zwischen den beiden Drehmitnahmenuten 6d besteht ein Mittelsteg 6e. Das Führungsrohr 2 ist mit Durchtrittsöffnungen 2b versehen, in welche walzenförmige Verriegelungselemente 7 eingesetzt sind. Das Führungsrohr 2 weist ausserdem in die Drehmitnahmenuten 6c, 6d eingreifende, der Uebertragung des Drehmomentes von Führungsrohr 2 auf den Werkzeugschaft 6 dienende Drehmitnehmer 2c, 2d auf. Auf dem Führungsrohr 2 ist eine Stellhülse 8 gegen die Kraft einer in einem Ansatz 1a des Gehäuses 1 geführten Druckfeder 9 axial begrenzt verschiebbar. Die Stellhülse 8 weist eine umlaufende Ausweichnische 8a für die Verriegelungskörper 7 auf. Beim Zurückziehen der Stellhülse 8 gelangt die Ausweichnische 8a in den Bereich der Durchtrittsöffnungen 2b und die Verriegelungskörper 7 können radial in die Ausweichnische 8a ausweichen, worauf der Werkzeugschaft 6 aus dem Führungsrohr 2 herausgezogen werden kann. Die Stellhülse 8 ist mittels eines Sicherungsringes 10 in Vorschubrichtung gesichert.The tool holder shown in FIGS. 1 and 2 is arranged on a drilling device, for example on a hammer drill, with a housing 1. A guide tube 2 is in the housing via a bearing 3 1 rotatably mounted. A sealing ring 4 sliding on the guide tube 2 prevents dirt from penetrating into the bearing 3 on the one hand and lubricant from the housing 1 on the other hand. A striker 5 is axially displaceably mounted in the guide tube 2. A tool shaft 6 of a drilling tool is inserted into the free end 2a of the guide tube 2. The tool shank 6 has two diametrically opposite recesses 6a which are axially closed on both sides, and rotational driving grooves 6c, 6d which are arranged offset with respect to these and open towards the rear end 6b. There is a central web 6e between the two rotary driving grooves 6d. The guide tube 2 is provided with through openings 2b, into which roller-shaped locking elements 7 are inserted. The guide tube 2 also has rotary drivers 2c, 2d which engage in the rotary driving grooves 6c, 6d and serve to transmit the torque from the guide tube 2 to the tool shank 6. On the guide tube 2, an adjusting sleeve 8 can be displaced axially to a limited extent against the force of a compression spring 9 guided in an extension 1a of the housing 1. The adjusting sleeve 8 has a circumferential escape niche 8a for the locking body 7. When the adjusting sleeve 8 is pulled back, the escape niche 8a reaches the area of the passage openings 2b and the locking bodies 7 can move radially into the escape niche 8a, whereupon the tool shaft 6 can be pulled out of the guide tube 2. The adjusting sleeve 8 is secured in the feed direction by means of a locking ring 10.

Aus Fig. 3 und 4 ist ein gegenüber Fig. 1 und 2 etwas vergrösserter Werkzeugschaft 16 mit axial geschlossenen Ausnehmungen 16a und zum rückwärtigen Ende 16b hin offenen Drehmitnahmenuten 16c, 16d ersichtlich. Wie Fig. 4 zeigt, liegen die beiden Ausnehmungen 16a einander diametral gegenüber. Die Ausnehmungen 16a sind somit symmetrisch bezüglich der durch die Längsachse verlaufenden Symmetrie-Ebene Y angeordnet. Dasselbe gilt auch für die Anordnung und Ausbildung der Drehmitnahmenuten 16c, 16d. Der zwischen den beiden Drehmitnahmenuten 16d verbleibende Mittelsteg 16e weist bezuglich der Symmetrie- Ebene Y einen Winkel A zwischen 0° und 15° auf.3 and 4 show a tool shank 16 which is somewhat enlarged compared to FIGS. 1 and 2, with axially closed recesses 16a and rotational driving grooves 16c, 16d which are open towards the rear end 16b. As shown in FIG. 4, the two recesses 16a lie diametrically opposite one another. The recesses 16a are thus arranged symmetrically with respect to the plane of symmetry Y running through the longitudinal axis. The same applies to the arrangement and design of the rotary driving grooves 16c, 16d. The central web 16e remaining between the two rotary driving grooves 16d has an angle A between 0 ° and 15 ° with respect to the plane of symmetry Y.

Der aus Fig. 5 und 6 ersichtliche Werkzeugschaft 26 unterscheidet sich gegenüber der in Fig. 3 und 4 dargestellten Ausführung hauptsächlich durch die Anzahl der Drehmitnahmenuten 26c, 26d. Auch hier sind die Ausrehmungen 26a und die Drehmitnahmenuten 26c, 26d bezüglich der Symmetrie-Ebene Y symmetrisch angeordnet und ausgebildet. Gegenüber der Ausführung in Fig. 3 und 4 unterscheidet sich diese Ausführung dadurch, dass die zwischen den Drehmitnahmenuten 26c, 26d verbleibenden Mittelstege 26e, 26f zueinander parallele Flanken mit einem Winkel bezüglich der Symmeterieebene Y von 0° aufweisen.The tool shank 26 shown in FIGS. 5 and 6 differs from the embodiment shown in FIGS. 3 and 4 mainly by the number of rotary driving grooves 26c, 26d. Here too, the bores 26a and the rotary driving grooves 26c, 26d are arranged and formed symmetrically with respect to the plane of symmetry Y. This embodiment differs from the embodiment in FIGS. 3 and 4 in that the central webs 26e, 26f remaining between the rotary driving grooves 26c, 26d have flanks which are parallel to one another and have an angle with respect to the plane of symmetry Y of 0 °.

Fig. 7 und 8 zeigen eine vierte Ausführung eines Werkzeugschaftes 36. Dieser Werkzeugschaft 36 weist zwei einander diametral gegenüberliegende Ausnehmungen 36a auf. Die Gesamtzahl der zum rückwärtigen Ende 36b hin offenen Drehmitnahmenuten 36c, 36d beträgt fünf. Auch bei der in Fig. 7 und 8 dargestellten Ausführung ist die Summe der Querschnitte der Drehmitnahmenuten 36c, 36d, 36f auf beiden Seiten der Längsebene X gleich. Der Winkel B des zwischen den Drehmitnahmenuten 36c verbleibenden Mittelsteges 36e gegenüber der Symmetrie-Ebene Y beträgt beispielsweise etwa 5°.7 and 8 show a fourth embodiment of a tool shank 36. This tool shank 36 has two diametrically opposite recesses 36a. The total number of rotary driving grooves 36c, 36d open towards the rear end 36b is five. 7 and 8, the sum of the cross sections of the rotary driving grooves 36c, 36d, 36f is the same on both sides of the longitudinal plane X. The angle B of the central web 36e remaining between the rotary driving grooves 36c with respect to the plane of symmetry Y is, for example, approximately 5 °.

Claims (7)

  1. Device on hand machine tools for torque transmission to percussive drilling tools, having two recesses (6a, 16a, 26a, 36a) which lie diametrically opposite each other and are closed axially at both sides, and which interact with locking elements (7), at least three rotary drive slots (6c, 6d, 16c, 16d, 26c, 26d, 36c, 36d), opening out at the rear end (6b, 16b, 26b, 36b) of the tool shank (6, 16, 26, 36) and disposed on both sides of a longitudinal plane (X) running through the two recesses (6a, 16a, 26a, 36a), for strip-type rotary work drivers (2b, 2c) which are distributed along the periphery in such a way that two rotary drive slots (6c, 6d, 16c, 16d, 26c, 26d, 36c, 36d) never lie diametrically opposite each other, characterised in that the sum of the cross-sections of the rotary drive slots (6c, 16c, 26c, 36c) disposed on one side of the longitudinal plane (X) corresponds essentially to the sum of the rotary drive slots (6d, 16d, 26d, 36d) disposed on the other side of the longitudinal plane (X), and on each side of the longitudinal plane (X) the rotary drive slots (6c, 6d, 16c, 16d, 26c, 26d, 36c, 36d) are disposed and formed symmetrically to a plane of symmetry (Y) running vertically through the longitudinal plane (X).
  2. Device according to Claim 1, characterised in that the number of rotary drive slots (6d, 16d, 36d) is greater on one side of the longitudinal plane (X) than the number of rotary drive slots (6c, 16c, 36c) on the other side of the longitudinal plane (X).
  3. Device according to Claim 1 or 2, characterised in that in total three rotary drive slots (6c, 6d, 16c, 16d) are provided.
  4. Device according to one of Claims 1 to 3, characterised in that all rotary drive slots (6c, 6d, 16c, 16d, 26c, 26d, 36c, 36d) are of equal length.
  5. Device according to one of Claims 1 to 4, characterised in that the cross bar (6e, 16e, 26e, 26f, 36e) between two adjacent rotary drive slots (6d, 16c, 16d, 36c), crossed by the plane of symmetry (Y) exhibits an angle (A, B) of between 0° and 15° to the plane of symmetry (Y).
  6. Tool for a device according to one of Claims 1 to 5, characterised in that the tool shank (6, 16, 26, 36) has two recesses (6a, 16a, 26a, 36a) which lie diametrically opposite each other and are closed axially at both sides, and is provided with at least three rotary drive slots (6c, 6d, 16c, 26c, 26d, 36c, 36d), opening out at the rear end (6b, 16b, 26b, 36b) of the tool shank (6, 16, 26, 36) disposed on both sides of a longitudinal plane (X) running through the two recesses (6a, 16a, 26a, 36a), said rotary drive slots being distributed along the periphery in such a way that two rotary drive slots (6c, 6d, 16c, 16d, 26c, 26d, 36c, 36d) never lie diametrically opposite each other and the sum of the cross-sections of the rotary drive slots (6c, 16c, 26c, 36c) disposed on one side of the longitudinal plane (X) corresponds essentially to the sum of the rotary drive slots (6d, 16d, 26d, 36d) disposed on the other side of the longitudinal plane (X), and on each side of the longitudinal plane (X) the rotary drive slots (6c, 6d, 16c, 16d, 26c, 26d, 36c, 36d) are disposed and formed symmetrically to a plane of symmetry (Y) running vertically through the longitudinal plane (X).
  7. Tool for a device according to one of Claims 1 to 5, the tool shank (6, 16, 26, 36) of which has two recesses (6a, 16a, 26a, 36a) which lie diametrically opposite each other and are closed axially at both sides, and is provided with at least two rotary drive slots (6c, 6d, 16c, 16d, 26c, 26d, 36c, 36d), opening out at the rear end (6b, 16b, 26b, 36b) of the tool shank (6, 16, 26, 36) disposed on both sides of an axial plane (X or Y) comprising the longitudinal axis of the tool shank (6, 16, 26, 36), said rotary drive slots being distributed along the periphery in such a way that two equal-sized rotary drive slots (6c, 6d, 16c, 16d, 26c, 26d, 36c, 36d) never lie diametrically opposite each other, characterised in that the sum of the cross-sections of the rotary drive slots (6c, 16c, 26c, 36c) disposed on one side of the axial plane (X or Y) corresponds essentially to the sum of the rotary drive slots (6d, 16d, 26d, 36d) disposed on the other side of the axial plane (X or Y), and the rotary drive slots (6c, 6d, 16c, 16d, 26c, 26d, 36c, 36d) are disposed and formed symmetrically to this axial plane (X or Y).
EP89908381A 1988-07-22 1989-07-19 A device on manual machine tools for torque transmission Expired - Lifetime EP0432169B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89908381T ATE96073T1 (en) 1988-07-22 1989-07-19 EQUIPMENT ON HAND TOOLS FOR TORQUE TRANSMISSION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3824894A DE3824894A1 (en) 1988-07-22 1988-07-22 DEVICE ON HAND MACHINE TOOLS FOR TORQUE TRANSMISSION
DE3824894 1988-07-22

Publications (2)

Publication Number Publication Date
EP0432169A1 EP0432169A1 (en) 1991-06-19
EP0432169B1 true EP0432169B1 (en) 1993-10-20

Family

ID=6359294

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89908381A Expired - Lifetime EP0432169B1 (en) 1988-07-22 1989-07-19 A device on manual machine tools for torque transmission

Country Status (8)

Country Link
US (1) US5076371A (en)
EP (1) EP0432169B1 (en)
JP (1) JP2736144B2 (en)
KR (1) KR0148797B1 (en)
CN (1) CN1015786B (en)
DE (2) DE3824894A1 (en)
DK (1) DK171211B1 (en)
WO (1) WO1990000957A1 (en)

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DE4141846A1 (en) * 1991-12-18 1993-06-24 Hilti Ag IMPACT DRILLING TOOLS AND CHISELING TOOLS FOR THESE TOOLS
DE4200643A1 (en) * 1992-01-13 1993-07-15 Hilti Ag IMPACT DRILLING TOOLS AND CHISELING TOOLS FOR THESE TOOLS
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Also Published As

Publication number Publication date
JP2736144B2 (en) 1998-04-02
WO1990000957A1 (en) 1990-02-08
DK73390D0 (en) 1990-03-21
DK171211B1 (en) 1996-07-29
DE3824894A1 (en) 1990-01-25
JPH03505996A (en) 1991-12-26
CN1040847A (en) 1990-03-28
DK73390A (en) 1990-03-31
KR900701478A (en) 1990-12-03
US5076371A (en) 1991-12-31
KR0148797B1 (en) 1998-10-15
EP0432169A1 (en) 1991-06-19
DE58905983D1 (en) 1993-11-25
CN1015786B (en) 1992-03-11

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