EP0988936B1 - Fastening tool - Google Patents

Fastening tool Download PDF

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Publication number
EP0988936B1
EP0988936B1 EP99810700A EP99810700A EP0988936B1 EP 0988936 B1 EP0988936 B1 EP 0988936B1 EP 99810700 A EP99810700 A EP 99810700A EP 99810700 A EP99810700 A EP 99810700A EP 0988936 B1 EP0988936 B1 EP 0988936B1
Authority
EP
European Patent Office
Prior art keywords
coupling part
tool spindle
screwing
intermediate coupling
tool
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
EP99810700A
Other languages
German (de)
French (fr)
Other versions
EP0988936A3 (en
EP0988936A2 (en
Inventor
Anton Neumaier
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.)
Hilti AG
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Hilti AG
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Filing date
Publication date
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Publication of EP0988936A2 publication Critical patent/EP0988936A2/en
Publication of EP0988936A3 publication Critical patent/EP0988936A3/en
Application granted granted Critical
Publication of EP0988936B1 publication Critical patent/EP0988936B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B25B23/0064—Means for adjusting screwing depth
    • 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
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/141—Mechanical overload release couplings

Definitions

  • the invention relates to a screwing device according to the preamble of patent claim 1.
  • the Torque clutch is composed of a first clutch part, a second coupling part and one arranged between the two coupling parts Intermediate coupling part.
  • the first coupling part is designed as a gear and is in non-rotatable connection with a drive motor.
  • the second coupling part stands with one Tool spindle in connection, a screw-in tool at the free end on the direction of rotation receives.
  • the intermediate coupling part rotatably arranged on the tool spindle is disc-shaped and is used for torque transmission from the first coupling part to the second coupling part.
  • the invention has for its object to provide a screwdriver that is economical can be produced and quickly and securely screwed into an underground can be turned.
  • the one pointing in the direction of rotation is advantageous Stop of the tool spindle of a in a circumferential groove Tool spindle arranged circlip formed.
  • the second coupling part expediently points on the in the direction of rotation facing side has a locking contour in the form of a tooth-shaped profile, in the starting position of the tool spindle with a positive fit corresponding locking contour of the housing interacts.
  • FIG Housing 1 The part of a screwing device according to the invention shown in FIG Housing 1, one via a threaded connection, opposite the housing 1 parallel to Depth stop 2 adjustable in the direction of rotation, one relative to the housing 1 displaceable tool spindle 8, a drive motor, not shown, with a Drive shaft 7 and one between the tool spindle 8 and the drive shaft 7 arranged torque clutch 3.
  • the tool spindle is located at an end region facing away from the torque clutch 3 8 with a tool holder 9 in connection.
  • This tool holder 9 protrudes with a hexagonal insertion end in a blind hole in the tool spindle 8 and is secured axially by means of a spring-loaded ball.
  • the free end of the tool holder 9, which is opposite the insertion end, is also with a Blind hole provided that the inclusion of a screwing tool 14 in the form a screw bit is used.
  • This screw bit protrudes into a cross-slit Receiving area of a screw 12 which is screwed into a base 13 shall be.
  • the torque clutch 3 has a first clutch part 4 and a second clutch part 6 and an intermediate coupling part 5.
  • the first coupling part 4 is rotatable, but axially firmly mounted on the tool spindle 8 and has a tooth-shaped on its peripheral contour Profiling on the form-fitting with a corresponding counter-profiling the drive shaft 7 of the drive motor cooperates.
  • On one in the direction of rotation facing side of the first coupling part 4 protrudes at least one cam 41 which positively with at least one further cam 51 of the intermediate coupling part 5 is connectable.
  • the second coupling part 6 is fixedly connected to the tool spindle 8 and projects beyond it the outer contour of the same radially.
  • a locking contour 61 which in the starting position of the screwdriver with at least one corresponding one Interlocking contour 11 of the housing cooperates.
  • the locking contours 61, 11 can be formed, for example, by tooth-shaped profiles.
  • the intermediate coupling part 5 is freely rotatably mounted on the tool spindle 8 and due to a stop 81 of the tool spindle 8 against the direction of rotation only limited transfer.
  • the stop 81 is formed by a locking ring, which in a circumferential groove of the tool spindle 8 protrudes.
  • a spring element 15 in the form of a Coil spring arranged, which in the starting position of the screwing device Intermediate coupling part 5 spaced from the second coupling part 6 against the stop 81 presses.
  • first coupling part 4 and the tool spindle 8 Spring 10 also arranged in the form of a helical spring, which the tool spindle 8th in the starting position of the screwing device into a position on the direction of rotation presses in the cams 41, 51 of the first coupling part 6 and the intermediate coupling part are axially spaced apart.
  • the screwdriver Before the screwing-in process begins, the screwdriver is in one Starting position according to FIG. 1, in which all coupling parts 4, 5, 6 of the Torque clutch 3 are axially spaced apart.
  • the drive motor In the subsequent actuation of an actuation switch, not shown the drive motor, which is also not shown in full, begins to rotate. Whose Rotational movement or torque is generated via the drive shaft 7 of the drive motor the first coupling part 4 and from there via the intermediate coupling part 5 to the second Coupling part 6 and thus transferred to the tool spindle 8.
  • the intermediate coupling part 5 is different from the first coupling part 4 and is not removed from the second coupling part 6 is that the cams 41, 51 have mutually interacting flanks that run inclined to the direction of rotation. This results from the torque to be transmitted in the direction of rotation force component that is greater than the force of the between the second coupling part 6 and the intermediate coupling part 5 arranged spring element 15.
  • the flanks of the claws 52, 62 run essentially parallel to Screwing.
  • the first coupling part 4 rotates relative to the intermediate coupling part 5 until the axial projections of the cams 41, 51 no longer cover. Because at this point in the direction of rotation no more force the intermediate coupling part 5 acts, the prestressed spring element 15 relax between the intermediate coupling part 5 and the second coupling part 6 and push the intermediate coupling part 5 to the first coupling part 4.
  • the cams 41, 51 and the claws 52, 62 different extents T1, T2, the two claws 52, 62 come out of engagement and into a position in which they are axially spaced apart at a distance T3, so that even with a continuous rotary movement of the first coupling part 4 and Intermediate coupling part 5 no more rotary movement on the tool spindle 8 can be transferred.
  • the distance T3 corresponds to the difference between the extension T2 of the cams 41, 51 and the extension T1 of the claws 52, 62nd

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Window Of Vehicle (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Graft Or Block Polymers (AREA)
  • Dowels (AREA)
  • Materials For Medical Uses (AREA)

Abstract

The screw driver has a housing (1), drive motor, an axially staggered spindle (8) joined to the motor by a motor-driven torque-coupling (3) in two parts (4,6) between which is a rotarily and axially movably mounted intermediate coupling part (5). Cams (41,51) possessing flank surfaces between the intermediate and first coupling parts and claws (52,62) between the facing end sides of the second and intermediate coupling parts interlock the second and intermediate coupling parts. The housing has an adjustable bit-stop (2). The extent of the cams is greater than that of the claws. A spring element (15)is positioned between the second and intermediate coupling parts and holds the intermediate coupling part axially spaced apart from the two coupling parts and presses it against a spindle thrust piece (81).

Description

Die Erfindung betrifft ein Schraubgerät gemäss dem Oberbegriff des Patentanspruchs 1.The invention relates to a screwing device according to the preamble of patent claim 1.

Aus EP-A-0 195 853 ist ein Schraubgerät mit einem Tiefenanschlag und einer geräuscharmen sowie verschleissfreien Drehmomentkupplung bekannt. Der Tiefenanschlag ist parallel zur Eindrehrichtung gegenüber einem Gehäuse verstellbar. Die Drehmomentkupplung setzt sich zusammen aus einem ersten Kupplungsteil, einem zweiten Kupplungsteil und einem zwischen den beiden Kupplungsteilen angeordneten Zwischenkupplungsteil. Das erste Kupplungsteil ist als Zahnrad ausgebildet und steht in drehfester Verbindung mit einem Antriebsmotor. Das zweite Kupplungsteil steht mit einer Werkzeugspindel in Verbindung, die am eindrehrichtungsseitigen freien Ende ein Eindrehwerkzeug aufnimmt. Das auf der Werkzeugspindel drehbar angeordnete Zwischenkupplungsteil ist scheibenförmig ausgebildet und dient der Drehmomentübertragung von dem ersten Kupplungsteil auf das zweite Kupplungsteil. Von dem ersten Kupplungsteil und dem Zwischenkupplungsteil ragen Nocken ab, die während eines Eindrehvorganges formschlüssig ineinandergreifen. Die Flanken der Nocken verlaufen geneigt zu der Eindrehrichtung. Zwischen dem zweiten Kupplungsteil und dem Zwischenkupplungsteil sind konstant ineinandergreifende Klauen angeordnet, deren Flanken abschnittweise geneigt und zu deren freien Ende hin parallel zur Eindrehrichtung verlaufen. Die parallel zur Eindrehrichtung verlaufende Erstreckung der Nocken und Klauen ist gleich gross.From EP-A-0 195 853 is a screwdriver with a depth stop and one known low-noise and wear-free torque clutch. The depth stop is adjustable parallel to the direction of rotation relative to a housing. The Torque clutch is composed of a first clutch part, a second coupling part and one arranged between the two coupling parts Intermediate coupling part. The first coupling part is designed as a gear and is in non-rotatable connection with a drive motor. The second coupling part stands with one Tool spindle in connection, a screw-in tool at the free end on the direction of rotation receives. The intermediate coupling part rotatably arranged on the tool spindle is disc-shaped and is used for torque transmission from the first coupling part to the second coupling part. From the first coupling part and the intermediate coupling part protrude cams during a screwing interlock positively. The flanks of the cams are inclined to the direction of rotation. Are between the second coupling part and the intermediate coupling part claws constantly interlocking, the flanks of which are inclined in sections and run parallel to the direction of rotation at their free end. The parallel to the direction of rotation extending extension of the cams and claws is the same size.

Vor einem Eindrehvorgang mit dem aus der EP-A-0 195 853 bekannten Schraubgerät erfolgt ein Andrücken des Setzgerätes gegen einen Untergrund in den eine Schraube eingedreht werden soll. Dabei werden alle Teile der Drehmomentkupplung und eine zwischen dem ersten Kupplungsteil und dem Zwischenkupplungsteil angeordnete Feder zusammengedrückt. Bei der Inbetriebnahme des Antriebsmotors steigt das auf die Arbeitsspindel einwirkende Drehmoment an und das Zwischenkupplungsteil wird zusammen mit dem ersten Kupplungsteil gegenüber dem zweiten Kupplungsteil in Umfangsrichtung verdreht. Dabei gleiten die Klauen des zweiten Kupplungsteiles und des Zwischenkupplungsteiles auf den geneigt zur Eindrehrichtung verlaufenden Abschnitten der Flanken aufeinander, bis diese an deren parallel zur Eindrehrichtung verlaufenden Abschnitten zur Anlage gelangen.Before screwing in with the screwing device known from EP-A-0 195 853 the setting tool is pressed against a surface in the one screw should be screwed in. All parts of the torque clutch and one spring arranged between the first coupling part and the intermediate coupling part pressed together. When the drive motor is started up, this increases to Working spindle acting torque and the intermediate coupling part together with the first coupling part in relation to the second coupling part in Twisted circumferential direction. The claws of the second coupling part and the Intermediate coupling part on the sections inclined to the direction of insertion of the flanks on top of each other until they are parallel to the direction of rotation Sections to get to the facility.

Beim weiteren Eindrehen der Schraube bewegt sich die Werkzeugspindel gegenüber dem Gehäuse und dem Tiefenanschlag in Eindrehrichtung. Dabei entfernen sich das zweite Kupplungsteil und das Zwischenkupplungsteil langsam von dem ersten Kupplungsteil. Die Berührungsflächen zwischen den Nocken wird auf diese Weise immer kleiner. Beim Erreichen der voreingestellten Tiefe der Schraube gelangen die beiden Nocken ausser Eingriff, so dass sich das erste Kupplungsteil gegenüber dem Zwischenkupplungsteil wiederum frei drehen kann. Mit Hilfe der vorgespannten Feder wird das Zwischenkupplungsteil zum zweiten Kupplungsteil gedrückt. Das Aufeinandergleiten der Klauen auf deren geneigten Abschnitten bewirkt eine Verdrehung des Zwischenkupplungsteiles gegenüber dem zweiten Kupplungsteil in einer zur Drehrichtung des ersten Kupplungsteiles gegenläufigen Richtung. Dabei ergibt sich auch eine Versetzung des Zwischenkupplungsteiles zum zweiten Kupplungsteil hin im Ausmass der parallel zur Eindrehrichtung gemessenen Erstreckung der geneigten Abschnitte der Klauen. Am Ende des Eindrehvorganges sind die Nocken des ersten Kupplungsteiles und des Zwischenkupplungsteiles parallel zur Eindrehrichtung voneinander beabstandet.When the screw is screwed in further, the tool spindle moves opposite the housing and the depth stop in the direction of insertion. The move away second coupling part and the intermediate coupling part slowly from the first Coupling part. The contact surfaces between the cams will always be this way smaller. When the preset depth of the screw is reached, the two come Cams disengaged so that the first coupling part is opposite the intermediate coupling part can turn freely again. With the help of the pre-tensioned spring, it will Intermediate coupling part pressed to the second coupling part. The gliding of the Claws on their inclined sections cause the intermediate coupling part to twist compared to the second coupling part in a to the direction of rotation first coupling part opposite direction. There is also a transfer of the intermediate coupling part to the second coupling part to the extent parallel to Direction of rotation measured extent of the inclined portions of the claws. At the end the insertion process are the cams of the first coupling part and the Intermediate coupling part spaced apart parallel to the direction of rotation.

Als Nachteil dieses Schraubgerätes werden die aufgrund der speziellen Formgebung nicht wirtschaftlich herstellbaren Klauen angesehen, deren Flanken in zwei Abschnitte unterteilt sind, wobei ein erster Abschnitt geneigt zur Eindrehrichtung und ein zweiter, sich bis zum freien Ende der Klauen hin erstreckender Abschnitt parallel zur Eindrehrichtung verlaufen.The disadvantage of this screwdriver are due to the special shape claws not economically producible, their flanks in two sections are divided, a first section inclined to the direction of rotation and a second, itself Section extending to the free end of the claws parallel to the direction of rotation run.

Der Erfindung liegt die Aufgabe zugrunde, ein Schraubgerät zu schaffen, das wirtschaftlich herstellbar ist und mit dem Schrauben schnell und sicher in einen Untergrund eingedreht werden können.The invention has for its object to provide a screwdriver that is economical can be produced and quickly and securely screwed into an underground can be turned.

Die Lösung dieser Aufgabe erfolgt durch ein Schraubgerät, welches die im kennzeichnenden Abschnitt des Patentanspruchs 1 angeführten Merkmale aufweist.This problem is solved by a screwdriver, which the in characterizing section of claim 1 has features.

Aufgrund der erfindungsgemässen, unterschiedlichen Erstreckung der Nocken und Klauen und durch die Anordnung des Federelementes zwischen dem zweiten Kupplungsteil und dem Zwischenkupplungsteil wird nach dem Erreichen einer Überlaststellung der Drehmomentkupplung, in der die Nocken des ersten Kupplungsteiles und des Zwischenkupplungsteiles nicht mehr ineinander greifen und deren Axialprojektion nicht mehr überdecken, das Zwischenkupplungsteil von dem Federelement zum ersten Kupplungsteil geschoben, so dass die Klauen ausser Eingriff gelangen und sich ein axialer Abstand zwischen den Klauen ergibt.Because of the different extension of the cams and Claws and by the arrangement of the spring element between the second Coupling part and the intermediate coupling part is after reaching an overload position the torque clutch, in which the cams of the first coupling part and Intermediate coupling part no longer interlock and their axial projection does not cover more, the intermediate coupling part from the spring element to the first Coupling part pushed so that the claws disengage and engage axial distance between the claws results.

Aus herstelltechnischen Gründen ist vorteilhafterweise der in Eindrehrichtung weisende Anschlag der Werkzeugspindel von einem in einer umlaufend ausgebildeten Nut der Werkzeugspindel angeordneten Sicherungsring gebildet.For technical reasons, the one pointing in the direction of rotation is advantageous Stop of the tool spindle of a in a circumferential groove Tool spindle arranged circlip formed.

Damit bei laufenden Antriebsmotor jeweils eine Schraube auf ein mit der Werkzeugspindel in Verbindung stehendes Eindrehwerkzeug aufgesetzt werden kann, ist es notwendig, dass die Werkzeugspindel gegenüber dem Gehäuse drehfest anordbar ist, wenn die Klauen des Zwischenkupplungsteiles und die Klauen des zweiten Kupplungsteiles ausser Eingriff und axial voneinander beabstandet sind. Zu diesem Zweck weist zweckmässigerweise das zweite Kupplungsteil an der in Eindrehrichtung weisenden Seite eine Verriegelungskontur in Form einer zahnförmigen Profilierung auf, die in der Ausgangsstellung der Werkzeugspindel formschlüssig mit einer entsprechenden Verriegelungskontur des Gehäuses zusammenwirkt.So that when the drive motor is running, one screw on one with the Tool spindle in connection with the insertion tool can be placed it is necessary that the tool spindle can be arranged in a rotationally fixed manner relative to the housing, if the claws of the intermediate coupling part and the claws of the second Coupling part out of engagement and axially spaced apart. To this The second coupling part expediently points on the in the direction of rotation facing side has a locking contour in the form of a tooth-shaped profile, in the starting position of the tool spindle with a positive fit corresponding locking contour of the housing interacts.

Die Erfindung wird anhand von Zeichnungen, die ein Ausführungsbeispiel wiedergeben, näher erläutert. Es zeigen:

Fig.1
ein Teil eines geschnitten dargestellten, erfindungsgemässen Schraubgerätes mit eingesetztem Eindrehwerkzeug und einer Schraube;
Fig. 2
eine vereinfacht dargestellte Drehmomentkupplung des Schraubgerätes gemäss Fig. 1 in der Ausgangsstellung des Schraubgerätes;
Fig. 3
die Drehmomentkupplung gemäss Fig. 2 in der angepressten Stellung des Schraubgerätes, vor Beginn des Eindrehvorganges der Schraube;
Fig. 4
die Drehmomentkupplung gemäss Fig. 2 während des Eindrehvorganges der Schraube;
Fig. 5
die Drehmomentkupplung gemäss Fig. 2 in der angepressten Stellung des Setzgerätes, am Ende des Eindrehvorganges.
The invention is explained in more detail with reference to drawings which show an exemplary embodiment. Show it:
Fig.1
part of a screwing device according to the invention, shown in section, with inserted screwing tool and a screw;
Fig. 2
a simplified torque coupling of the screwing device according to FIG 1 in the starting position of the screwing device.
Fig. 3
2 in the pressed-on position of the screwing device, before the screwing-in process begins;
Fig. 4
the torque coupling according to Figure 2 during the screwing process of the screw.
Fig. 5
2 in the pressed position of the setting tool, at the end of the screwing-in process.

Der in Fig. 1 dargestellte Teil eines erfindungsgemässen Schraubgerätes weist ein Gehäuse 1, einen über eine Gewindeverbindung, gegenüber dem Gehäuse 1 parallel zur Eindrehrichtung versetzbaren Tiefenanschlag 2, eine gegenüber dem Gehäuse 1 versetzbare Werkzeugspindel 8, einen nicht näher dargestellten Antriebsmotor mit einer Antriebswelle 7 und eine zwischen der Werkzeugspindel 8 und der Antriebswelle 7 angeordnete Drehmomentkupplung 3 auf.The part of a screwing device according to the invention shown in FIG Housing 1, one via a threaded connection, opposite the housing 1 parallel to Depth stop 2 adjustable in the direction of rotation, one relative to the housing 1 displaceable tool spindle 8, a drive motor, not shown, with a Drive shaft 7 and one between the tool spindle 8 and the drive shaft 7 arranged torque clutch 3.

An einem von der Drehmomentkupplung 3 abgewandten Endbereich steht die Werkzeugspindel 8 mit einem Werkzeughalter 9 in Verbindung. Dieser Werkzeughalter 9 ragt mit einem sechskantigen Einsteckende in eine Sacklochbohrung der Werkzeugspindel 8 und wird axial mittels einer federbelasteten Kugel gesichert. Das freie Ende des Werkzeughalters 9, welches dem Einsteckende gegenüberliegt, ist ebenfalls mit einer Sacklochbohrung versehen, die der Aufnahme eines Eindrehwerkzeuges 14 in Form eines Schraubenbits dient. Dieser Schraubenbit ragt in einen kreuzschlitzartig ausgebildeten Aufnahmebereich einer Schraube 12, die in einen Untergrund 13 eingedreht werden soll.The tool spindle is located at an end region facing away from the torque clutch 3 8 with a tool holder 9 in connection. This tool holder 9 protrudes with a hexagonal insertion end in a blind hole in the tool spindle 8 and is secured axially by means of a spring-loaded ball. The free end of the tool holder 9, which is opposite the insertion end, is also with a Blind hole provided that the inclusion of a screwing tool 14 in the form a screw bit is used. This screw bit protrudes into a cross-slit Receiving area of a screw 12 which is screwed into a base 13 shall be.

Die Drehmomentkupplung 3 weist ein erstes Kupplungsteil 4, ein zweites Kupplungsteil 6 und ein Zwischenkupplungsteil 5 auf. Das erste Kupplungsteil 4 ist drehbar, aber axial fest auf der Werkzeugspindel 8 gelagert und weist an seiner Umfangskontur eine zahnförmige Profilierung auf, die formschlüssig mit einer entsprechenden Gegenprofilierung der Antriebswelle 7 des Antriebsmotors zusammenwirkt. An einer in Eindrehrichtung weisenden Seite des ersten Kupplungsteiles 4 ragt wenigstens ein Nocken 41 ab, der formschlüssig mit wenigstens einem weiteren Nocken 51 des Zwischenkupplungsteiles 5 in Verbindung bringbar ist.The torque clutch 3 has a first clutch part 4 and a second clutch part 6 and an intermediate coupling part 5. The first coupling part 4 is rotatable, but axially firmly mounted on the tool spindle 8 and has a tooth-shaped on its peripheral contour Profiling on the form-fitting with a corresponding counter-profiling the drive shaft 7 of the drive motor cooperates. On one in the direction of rotation facing side of the first coupling part 4 protrudes at least one cam 41 which positively with at least one further cam 51 of the intermediate coupling part 5 is connectable.

Das zweite Kupplungsteil 6 ist fest mit der Werkzeugspindel 8 verbunden und überragt die Aussenkontur derselben radial. Auf einer in Setzrichtung weisenden Seite des zweiten Kupplungsteiles 6 befindet sich eine Verriegelungskontur 61 die in der Ausgangsstellung des Schraubgerätes formschlüssig mit wenigstens einer entsprechenden Verriegelungskontur 11 des Gehäuses zusammenwirkt. Die Verriegelungskonturen 61, 11 können beispielsweise von zahnförmigen Profilierungen gebildet sein. Auf der entgegen der Eindrehrichtung weisenden Seite des zweiten Kupplungsteiles 6 ragt wenigstens eine Klaue 62 ab, die mit wenigstens einer weiteren Klaue 52 des Zwischenkupplungsteil 5 formschlüssig in Verbindung bringbar ist.The second coupling part 6 is fixedly connected to the tool spindle 8 and projects beyond it the outer contour of the same radially. On one side of the second pointing in the setting direction Coupling part 6 is a locking contour 61 which in the starting position of the screwdriver with at least one corresponding one Interlocking contour 11 of the housing cooperates. The locking contours 61, 11 can be formed, for example, by tooth-shaped profiles. On the opposite the side of the second coupling part 6 pointing in the direction of rotation protrudes at least one Claw 62, which with at least one further claw 52 of the intermediate coupling part 5 can be positively connected.

Das Zwischenkupplungteil 5 ist auf der Werkzeugspindel 8 frei drehbar gelagert und aufgrund eines Anschlages 81 der Werkzeugspindel 8 entgegen der Eindrehrichtung nur begrenzt versetzbar. Der Anschlag 81 wird gebildet von einem Sicherungsring, der in einer umlaufend ausgebildeten Nut der Werkzeugspindel 8 ragt. Zwischen dem zweiten Kupplungsteil 6 und dem Zwischenkupplungsteil 5 ist ein Federelement 15 in Form einer Schraubenfeder angeordnet, die in der Ausgangsstellung des Schraubgerätes das Zwischenkupplungsteil 5 vom zweiten Kupplungsteil 6 beabstandet gegen den Anschlag 81 drückt. Zwischen dem ersten Kupplungsteil 4 und der Werkzeugspindel 8 ist eine Feder 10 ebenfalls in Form einer Schraubenfeder angeordnet, die die Werkzeugspindel 8 in der Ausgangsstellung des Schraubgerätes in eine eindrehrichtungsseitige Stellung drückt, in der die Nocken 41, 51 des ersten Kupplungsteiles 6 und des Zwischenkupplungsteiles axial voneinander beabstandet sind.The intermediate coupling part 5 is freely rotatably mounted on the tool spindle 8 and due to a stop 81 of the tool spindle 8 against the direction of rotation only limited transfer. The stop 81 is formed by a locking ring, which in a circumferential groove of the tool spindle 8 protrudes. Between the second Coupling part 6 and the intermediate coupling part 5 is a spring element 15 in the form of a Coil spring arranged, which in the starting position of the screwing device Intermediate coupling part 5 spaced from the second coupling part 6 against the stop 81 presses. There is a between the first coupling part 4 and the tool spindle 8 Spring 10 also arranged in the form of a helical spring, which the tool spindle 8th in the starting position of the screwing device into a position on the direction of rotation presses in the cams 41, 51 of the first coupling part 6 and the intermediate coupling part are axially spaced apart.

Im Folgenden wird der Eindrehvorgang einer Schraube beschrieben.The screwing procedure for a screw is described below.

Vor dem Beginn des Eindrehvorganges befindet sich das Schraubgerät in einer Ausgangsstellung gemäss Fig. 1, in der alle Kupplungsteile 4, 5, 6 der Drehmomentkupplung 3 axial voneinander beabstandet sind.Before the screwing-in process begins, the screwdriver is in one Starting position according to FIG. 1, in which all coupling parts 4, 5, 6 of the Torque clutch 3 are axially spaced apart.

Beim Aufsetzen der Schraube 12 auf den Untergrund 13 und bei Andrücken des Schraubgerätes gegen diesen Untergrund 13, der im aufgezeigten Ausführungsbeispiel beispielsweise aus Holz besteht, dringt eine Spitze der Schraube 12 etwas in diesen Untergrund 13 und die Kupplungsteile 4, 5, 6 der Drehmomentkupplung 3 werden untereinander in eine formschlüssige Verbindung bzw. eine Mitnahmestellung gebracht, wie dies in Fig. 3 dargestellt ist. Die formschlüssige Verbindung zwischen den Verriegelungskonturen 11, 61 sowohl des Gehäuses 1 als auch des zweiten Kupplungsteiles 6 wird dabei aufgehoben.When placing the screw 12 on the surface 13 and pressing the Screwing device against this surface 13, the embodiment shown For example, made of wood, a tip of the screw 12 penetrates something into this Underground 13 and the coupling parts 4, 5, 6 of the torque clutch 3 brought into a positive connection with one another or in a driving position, as shown in Fig. 3. The positive connection between the Locking contours 11, 61 of both the housing 1 and the second coupling part 6 is canceled.

Bei der anschliessenden Betätigung eines nicht dargestellten Betätigungsschalters beginnt sich der ebenfalls nicht vollständig dargestellte Antriebsmotor zu drehen. Dessen Drehbewegung bzw. Drehmoment wird über die Antriebswelle 7 des Antriebsmotors auf das erste Kupplungsteil 4 und von dort über das Zwischenkupplungsteil 5 auf das zweite Kupplungsteil 6 und somit auf die Werkzeugspindel 8 übertragen. In the subsequent actuation of an actuation switch, not shown the drive motor, which is also not shown in full, begins to rotate. Whose Rotational movement or torque is generated via the drive shaft 7 of the drive motor the first coupling part 4 and from there via the intermediate coupling part 5 to the second Coupling part 6 and thus transferred to the tool spindle 8.

Während des Eindrehvorganges des Schraube 12 greifen die Nocken 41, 51, sowie die Klauen 52 und 62 formschlüssig ineinander. Sobald der Tiefenanschlag 2 auf der Oberfläche des Untergrundes 13 zur Anlage gelangt, erfolgt eine Relatiwersetzung der Werkzeugspindel 8 gegenüber dem mit dem Gehäuse 1 in Verbindung stehenden Tiefenanschlag 2. Da auch das erste Kupplungsteil 4 von einer Feder 10 axial fest in dem Gehäuse 1 gehalten wird, entfernt sich wie dies in Fig. 4 dargestellt ist, beim weiteren Eindrehvorgang das Zwischenkupplungsteil 5 und das zweite Kupplungsteil 6 immer weiter weg von dem ersten Kupplungsteil 4, bis beim Erreichen der gewünschten Eindrehtiefe der Schraube in einer Überlaststellung die beiden Nocken 41, 51 des ersten Kupplungsteiles 4 und des Zwischenkupplungsteiles 5 nicht mehr ineinandergreifen.During the screwing-in process of the screw 12, the cams 41, 51 as well as the Claws 52 and 62 are interlocking. Once the depth stop 2 on the surface of the subsurface 13 arrives, there is a relative calculation of Tool spindle 8 compared to that in connection with the housing 1 Depth stop 2. Since the first coupling part 4 is axially fixed in the spring by a spring 10 Housing 1 is held, as shown in Fig. 4, in the further Screwing in the intermediate coupling part 5 and the second coupling part 6 always further away from the first coupling part 4 until the desired one is reached Insertion depth of the screw in an overload position, the two cams 41, 51 of the first Coupling part 4 and the intermediate coupling part 5 no longer interlock.

Der Grund warum sich das Zwischenkupplungsteil 5 von dem ersten Kupplungsteil 4 und nicht von dem zweiten Kupplungsteil 6 entfernt, liegt darin, dass die Nocken 41, 51 geneigt zur Eindrehrichtung verlaufende, miteinander zusammenwirkende Flanken aufweisen. Dadurch ergibt sich aus dem zu übertragenden Drehmoment eine in Eindrehrichtung verlaufende Kraftkomponente, die grösser ist als die Kraft des zwischen dem zweiten Kupplungsteil 6 und dem Zwischenkupplungsteil 5 angeordneten Federelementes 15. Ausserdem verlaufen die Flanken der Klauen 52, 62 im wesentlichen parallel zur Eindrehrichtung.The reason why the intermediate coupling part 5 is different from the first coupling part 4 and is not removed from the second coupling part 6 is that the cams 41, 51 have mutually interacting flanks that run inclined to the direction of rotation. This results from the torque to be transmitted in the direction of rotation force component that is greater than the force of the between the second coupling part 6 and the intermediate coupling part 5 arranged spring element 15. In addition, the flanks of the claws 52, 62 run essentially parallel to Screwing.

Zum Zeitpunkt an dem die Nocken 41, 51 nicht mehr ineinandergreifen - die gewünschte Eindrehtiefe der Schraube 12 ist erreicht - verdreht sich das erste Kupplungsteil 4 gegenüber dem Zwischenkupplungsteil 5 bis sich die Axialprojektionen der Nocken 41, 51 nicht mehr überdecken. Da zu diesem Zeitpunkt in Eindrehrichtung keine Kraft mehr auf das Zwischenkupplungsteil 5 einwirkt, kann sich das vorgespannte Federelement 15 zwischen dem Zwischenkupplungsteil 5 und dem zweiten Kupplungsteil 6 entspannen und dabei das Zwischenkupplungsteil 5 zum ersten Kupplungsteil 4 schieben. Da wie bereits erwähnt die Nocken 41, 51 und die Klauen 52, 62 unterschiedliche Erstreckungen T1, T2 aufweisen, gelangen die beiden Klauen 52, 62 ausser Eingriff und in eine Posititon in der diese im Abstand T3 axial voneinander beabstandet sind, so dass auch bei einer fortlaufenden Drehbewegung des ersten Kupplungsteiles 4 und des Zwischenkupplungsteiles 5 keine Drehbewegung mehr auf die Werkzeugspindel 8 mehr übertragen werden kann. Dies zeigt die Fig. 5. Der Abstand T3 entspricht der Differenz zwischen der Erstreckung T2 der Nocken 41, 51 und der Erstreckung T1 der Klauen 52, 62. At the time when the cams 41, 51 no longer mesh - the desired one The screwing depth of the screw 12 is reached - the first coupling part 4 rotates relative to the intermediate coupling part 5 until the axial projections of the cams 41, 51 no longer cover. Because at this point in the direction of rotation no more force the intermediate coupling part 5 acts, the prestressed spring element 15 relax between the intermediate coupling part 5 and the second coupling part 6 and push the intermediate coupling part 5 to the first coupling part 4. There like already mentioned the cams 41, 51 and the claws 52, 62 different extents T1, T2, the two claws 52, 62 come out of engagement and into a position in which they are axially spaced apart at a distance T3, so that even with a continuous rotary movement of the first coupling part 4 and Intermediate coupling part 5 no more rotary movement on the tool spindle 8 can be transferred. This is shown in FIG. 5. The distance T3 corresponds to the difference between the extension T2 of the cams 41, 51 and the extension T1 of the claws 52, 62nd

Nach dem erfolgten Eindrehvorgang der Schraube 12 wird das Schraubgerät von dem Untergrund 13 abgehoben und die Drehmomentkupplung 3 nimmt mit Hilfe einer zwischen dem ersten Kupplungsteil 4 und der Werkzeugspindel 8 wirkenden, vorgespannten Feder 10 ihre ursprüngliche Ausgangsstellung wie sie in Fig. 1 und 2 dargestellt ist wieder ein.After the screw 12 has been screwed in, the screwing device is removed from the Surface 13 lifted off and the torque clutch 3 takes with the help of a biased acting between the first coupling part 4 and the tool spindle 8 Spring 10 its original starting position as shown in Figs. 1 and 2 is on again.

Claims (3)

  1. Fastening tool with a casing (1); a drive motor; an axially displaceable tool spindle (8); a torque coupling (3) connecting the drive motor and tool spindle (8) and comprising a first coupling part (4) driven by the drive motor, rotatably mounted and having a dentiform outer profile, a second coupling part (6) connected fixedly in rotation to the tool spindle (8), and an intermediate coupling part (5) rotatably and axially displaceably mounted on the tool spindle (8) between the two [other] coupling parts (4, 6) and displaceable away from the first coupling [part] (4) towards the second coupling [part] (6) to shift from a driving position to an overload position; cams (41, 51) with sloping flanks between the intermediate coupling part (5) and the first coupling part (4) to move these parts away from each other and dogs (52, 62) assigned to the opposing faces of the second coupling part (6) and intermediate coupling part (5) to make a rotationally positive connection between the intermediate coupling part (5) and the second coupling part (6); and a depth stop (2), arranged on the casing (1) and adjustable parallel with the screwing-in direction, with respect to which the tool spindle (8) is displaceable the opposite way to the screwing-in direction, against the force of a spring (10); characterized in that the extent (T2) of the cams (41, 51) measured parallel with the screwing-in direction is greater than the extent (T1) of the dogs (52, 62) and in that a spring element (15) is arranged between the second coupling part (6) and the intermediate coupling part (5), which [spring element] presses the intermediate coupling part (5) against a limit stop (81) of the tool spindle (8), with axial clearance from both [other] coupling parts (4, 6), in the initial position of the [fastening] tool.
  2. Fastening tool according to Claim 1, characterized in that the limit stop (81) of the tool spindle (8) facing in the screwing-in direction is formed by a circlip arranged in a circumferential groove in the tool spindle (8).
  3. Fastening tool according to Claim 1 or Claim 2, characterized in that the second coupling part (6) has on the side facing in the screwing-in direction a locking contour (61) which in the initial position of the tool spindle (8) co-operates in a positive-locking manner with a corresponding locking contour (11) of the casing (1).
EP99810700A 1998-09-25 1999-08-05 Fastening tool Expired - Lifetime EP0988936B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19844064 1998-09-25
DE19844064A DE19844064A1 (en) 1998-09-25 1998-09-25 Screwdriver

Publications (3)

Publication Number Publication Date
EP0988936A2 EP0988936A2 (en) 2000-03-29
EP0988936A3 EP0988936A3 (en) 2000-05-10
EP0988936B1 true EP0988936B1 (en) 2002-01-02

Family

ID=7882265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99810700A Expired - Lifetime EP0988936B1 (en) 1998-09-25 1999-08-05 Fastening tool

Country Status (11)

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US (1) US6109149A (en)
EP (1) EP0988936B1 (en)
JP (1) JP2000094353A (en)
AT (1) ATE211423T1 (en)
AU (1) AU747945B2 (en)
CA (1) CA2282213A1 (en)
DE (2) DE19844064A1 (en)
DK (1) DK0988936T3 (en)
ES (1) ES2171069T3 (en)
NO (1) NO311012B1 (en)
PL (1) PL187800B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10032949A1 (en) * 2000-07-06 2002-01-17 Hilti Ag screwdriving
US6758116B2 (en) * 2001-06-28 2004-07-06 Porter-Cable/Delta Depth adjusting system for a screw gun
DE10348517B4 (en) * 2003-10-18 2010-03-18 Hilti Aktiengesellschaft screwdriving
DE10360282A1 (en) * 2003-12-20 2005-07-14 Hilti Ag Hand drill with low noise torque coupling
DE102004011068B3 (en) * 2004-03-06 2005-06-23 Hilti Ag Electric screwdriver used with penetration depth limiting stop has torque coupling between drive and tool spindle provided with overload device and friction device for frictional transfer of drive torque
DE102004042952A1 (en) * 2004-09-06 2006-03-23 Hilti Ag Screwdriver with axially acting impact mechanism
US7185562B2 (en) * 2004-12-08 2007-03-06 Osteomed L.P. Disposable battery powered screw driver, locking mechanism, and accessories
JP2006315093A (en) * 2005-05-10 2006-11-24 Hitachi Koki Co Ltd Impact tool
CN100574946C (en) 2005-06-01 2009-12-30 密尔沃基电动工具公司 Power tool
US7665392B2 (en) * 2006-02-08 2010-02-23 Makita Corporation Tightening tool
JP5203129B2 (en) * 2008-10-16 2013-06-05 株式会社マキタ Rotating tool
DE102011078384A1 (en) 2011-06-30 2013-01-03 Robert Bosch Gmbh Drywall
EP3231559B1 (en) 2016-04-15 2019-05-22 Wera Werkzeuge GmbH Chuck with adjustable depth stop

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Publication number Priority date Publication date Assignee Title
US2126673A (en) * 1937-06-10 1938-08-09 Buckeye Portable Tool Company Portable power operated tool
DE3510605A1 (en) * 1985-03-23 1986-10-02 C. & E. Fein Gmbh & Co, 7000 Stuttgart CLUTCH FOR POWER DRIVEN SCREW TOOLS
US4809572A (en) * 1986-12-09 1989-03-07 Makita Electric Works, Ltd. Power driven screwdriver
DE3918227C1 (en) * 1989-06-03 1990-11-15 C. & E. Fein Gmbh & Co, 7000 Stuttgart, De
JPH0641811Y2 (en) * 1989-12-01 1994-11-02 日立工機株式会社 Screw driver
US5538089A (en) * 1995-06-05 1996-07-23 The Black & Decker Corporation Power tool clutch assembly

Also Published As

Publication number Publication date
US6109149A (en) 2000-08-29
AU747945B2 (en) 2002-05-30
AU4346099A (en) 2000-03-30
EP0988936A3 (en) 2000-05-10
PL187800B1 (en) 2004-10-29
NO994646L (en) 2000-03-27
DE59900711D1 (en) 2002-02-28
DE19844064A1 (en) 2000-03-30
ES2171069T3 (en) 2002-08-16
CA2282213A1 (en) 2000-03-25
PL335557A1 (en) 2000-03-27
DK0988936T3 (en) 2002-04-15
JP2000094353A (en) 2000-04-04
NO994646D0 (en) 1999-09-24
EP0988936A2 (en) 2000-03-29
NO311012B1 (en) 2001-10-01
ATE211423T1 (en) 2002-01-15

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