EP3120974A1 - Power screwdriver - Google Patents

Power screwdriver Download PDF

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Publication number
EP3120974A1
EP3120974A1 EP16177449.2A EP16177449A EP3120974A1 EP 3120974 A1 EP3120974 A1 EP 3120974A1 EP 16177449 A EP16177449 A EP 16177449A EP 3120974 A1 EP3120974 A1 EP 3120974A1
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EP
European Patent Office
Prior art keywords
ring
drive
actuating ring
transmission
locking
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Granted
Application number
EP16177449.2A
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German (de)
French (fr)
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EP3120974B1 (en
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Individual
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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
    • B25B23/0078—Reaction arms
    • 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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/002—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose for special purposes
    • 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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles

Definitions

  • the invention relates to a rotary wrench with a drive motor having a drive part, a transmission housing with gear elements and an outgoing from the transmission housing output shaft, a laterally offset arranged to the output shaft, fixedly connected to the transmission housing Stützfuß, and a hinge from a connected to the drive part, drive side Ring and connected to the transmission housing, the transmission side ring.
  • the drive part on the drive motor a handle and a switching device.
  • the screwdriver is held by the operator via the handle.
  • the drive member and thus the handle relative to the gear housing in individual locking positions rotatable relative to each other, so can the drive member after placing the rotary wrench to a screw against the gear housing rotate.
  • the drive part after putting the rotary wrench can be brought to a screw in a cheaper operating position in which the position of the handle is more comfortable for the operator.
  • a generic screwdriver is from the WO 2015/036232 A1 known. Also in this screwdriver, the drive part is connected via a rotary joint with the transmission housing, so that the drive part is in principle rotatable relative to the transmission housing. Part of the swivel joint is also a locking device. This is externally provided with a switching ring over which the locking device can be actuated on the one hand for blocking and on the other hand for releasing the rotary joint. For this purpose, the switching ring is locked by means of a locking device either in the blocking position, or in the release position.
  • the screwdriver according to the invention is defined by the features of claim 1.
  • the screwdriver has a drive part with a drive device. Separated from this, it has a gear housing, wherein the gear housing has a torque converter according to the design of a transmission and an output shaft, which transmit the rotational movement of the drive device.
  • the drive member is connected via a rotary joint to the transmission housing, so that the drive member is in principle rotatable relative to the transmission housing, as far as a blocking element does not lock the parts to each other.
  • actuating ring which is arranged to be movable relative to the drive-side ring and with respect to the transmission-side ring. It is movable between a release position, in which the rings are rotatable relative to one another, and a blocking position, in which the rings are blocked against one another.
  • the blocking element By a spring element which acts on the actuating ring over its entire, ranging from the blocking to the release position movement path toward the blocking position, the blocking element always automatically returns to those blocking position in which the blocking element, the two rings, ie the drive-side ring and the transmission-side ring, blocked against each other. Therefore, there is no danger to the operator that the rotary joint when starting the rotary screwdriver is inadvertently in the release position, for example because it is locked, and so the entire reaction torque acts on the handle of the drive part and it to an uncontrolled rotation of the rotary wrench to its own Axis comes.
  • the drive part remains rotatable with respect to the transmission housing, so that after fitting the rotary wrench to a screw connection, the drive part is turned into a favorable operating position can.
  • This operating position is a rotational position of the driving part, which is comfortable and safe for the operator.
  • the hinge locks automatically after setting this operating position, so that when subsequently performing a screwing in the parting plane of the swivel joint no torque occurs, which would have to be held by the operator. The screwing can thus always be carried out safely and without the risk of incorrect operation.
  • a drive device can be used, which applies a higher torque compared to the commonly used universal motors.
  • a commercially available cordless drill driver is used as a driving part of the rotary wrench according to the invention, which generates a torque of up to 60 Nm. Even then, the wrench can be used by the operator in a pleasant manner, while ensuring a high level of safety for the operator during the screwing operation.
  • At least one compression or tension spring serves as a load element. It is also possible to arrange over the circumference of the rotary joint more than one compression or tension spring, z. B. two or three compression or tension springs.
  • the advantage of this embodiment is the compact design, in which the diameter of the rotary wrench is not significantly increased in the region of the rotary joint.
  • Fig. 1 shows a screwdriver in a side view.
  • This has a drive part 3, which contains a drive device, for example an electric motor.
  • the drive part 3 is connected via a rotary joint 5 to the transmission housing 7 of a transmission part.
  • the gear housing 7 takes in its interior different pivot bearings for a Torque converter, for example, composed of gear elements planetary gear, as well as for an output shaft 9, which protrudes at its end with a polygon from the gear housing 7. On the output shaft 9 therefore a key nut can be placed.
  • the drive part 3 has an energy store 11 for electrical energy, for example an accumulator which supplies the drive device designed as an electric motor with electrical energy.
  • an energy store 11 for electrical energy for example an accumulator which supplies the drive device designed as an electric motor with electrical energy.
  • the drive part 3 may also contain a powered by an electrical connection cable with electric motor motor, as far as it works with a sufficiently high output torque.
  • the drive is adjustable. Furthermore, the drive part 3 has a side projecting handle 15, over which the operator can hold the screwdriver 1 and handle until the beginning or during the screwing process.
  • the torque generated by the drive device of the drive part 3 is amplified, and transmitted to the output shaft 9.
  • a rigid support leg 17 is attached, via which the gear housing 7 and thus the screwdriver 1 can be supported during operation against a non-illustrated stationary machine part as an abutment.
  • the drive part 3 is rotatably connected to the transmission housing 7.
  • the screwdriver 1 can advantageously be placed on a screw, wherein the drive part 3 then in an operating position that is comfortable for the operator, can be rotated.
  • the gear housing 7 can rotate relative to the drive part 3 due to the rotary joint 5. It can also be helpful if, when the drive part is switched on, the gear housing 7 rotates about its longitudinal axis and slowly pivots the support leg 17 until it comes into abutment against a stationary abutment. Only then is the pivot 5 blocked.
  • the rotary joint 5 has a locking device over which the hinge 5 automatically, so without active intervention of the operator, can be blocked. This prevents that due to a faulty operation, the output torque in the division plane of the rotary joint 5 is transmitted to the operator.
  • the rotary joint 5 is shown in a cross section.
  • the rotary joint 5 consists of a first ring 21 which is non-rotatably and preferably rigidly connected to the drive part 3 and in particular its housing.
  • a second ring 27 is rotatably mounted in the first ring 21, a second ring 27 is rotatably mounted.
  • the second ring 27 is rotationally fixed and preferably rigidly connected to the transmission housing 7 of the transmission part.
  • a locking device is active, although it can be deactivated by hand, but always returns by itself to its active position.
  • the locking elements 39 here the respective inner half shell 44 of a ball, can engage, so as to lock the two rings 21, 27 in the circumferential direction by positive engagement against each other, and so to block the hinge 5 ,
  • the blocking of the blocking elements 39 takes place by the exertion of pressure on the blocking elements 39.
  • This pressure generates a continuously acted upon by spring force actuating ring 41.
  • Fig. 2 shown is an actuating ring 41 which is acted upon in the direction of rotation by two similarly shaped compression springs 40.
  • the actuating ring 41 is, as well as the two rings 21, 27, arranged coaxially with the output shaft 9, and its axis of rotation coincides with the output shaft 9.
  • the serving as locking elements 39 balls are multiple times over the circumference of the rotary joint, in the embodiment a total of four times.
  • Each ball 39 is located in an opening 30 of the first ring 21, wherein the opening 30 in the circumferential direction has the size of the ball or only slightly larger than the ball.
  • the diameter of the balls 39 is greater than the radial thickness of the first ring 21, whereby each ball 39 protrudes radially outwardly beyond the ring 21 and / or projects radially inward beyond the ring 21.
  • the balls 39 can escape to the outside and then assume a radially outward position.
  • Their outwardly facing half-shells find here in a release portion 49 on the inside of the actuating ring 41 space.
  • a locking portion 48 connects to each release portion 49, which is also located on the inside of the actuating ring.
  • the release portion 49 is located at a larger radius than the lock portion 48.
  • the balls can either escape to the outside, so that no blocking between the two rings 21, 27 takes place ( Fig. 3 ), or they are held in their radially inwardly disposed position in which the balls 39 act as locking elements and the two rings 21, 27 in the circumferential direction against each lock ( Fig. 2 ).
  • Locking takes place only in one of these two positions, namely in the blocking position Fig. 2 in which each ball 39 engages inside in the locking counter-surface 45, and is supported outside against the locking portion 48. Because in this blocking position of the actuating ring 41 is held automatically due to the action of the spring element 40, and so far arrested.
  • the actuating ring 41 In order to remove the blocking position, the actuating ring 41 must be actively rotated against the force of the compression springs 40, without it being locked upon reaching the other end position, ie the release position. This non-locking in the release position has the consequence that, after releasing the actuating ring 41, this immediately snaps back into the blocking position due to its continuous spring load, whereby the locking elements 39 are pressed inward until they the two rings 21, 27 again Block against each other in the circumferential direction. This is facilitated if the release section 49 merges into the locking section 48 via a ramp 49a.

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

Abstract

Vorgeschlagen wird ein Drehschrauber mit einem einen Antriebsmotor aufweisenden Antriebsteil, einem Getriebegehäuse mit Getriebeelementen und einer aus dem Getriebegehäuse herausgeführten Ausgangswelle, einem seitlich versetzt zu der Ausgangswelle angeordneten, mit dem Getriebegehäuse fest verbundenen Stützfuß und einem Drehgelenk (5) aus einem mit dem Antriebsteil verbundenen, antriebsseitigen Ring (21) und einem mit dem Getriebegehäuse verbundenen, getriebeseitigen Ring (27). Um einen Drehschrauber zu schaffen, welcher eine gezielte Drehbarkeit des Antriebsteils gegenüber dem Getriebegehäuse bei zugleich hoher Bediensicherheit ermöglicht, wird vorgeschlagen ein koaxial zu der Ausgangswelle (9) angeordneter Betätigungsring (41), der gegenüber dem antriebsseitigen Ring (21) und gegenüber dem getriebeseitigen Ring (27) beweglich angeordnet ist und zwischen einer Freigabestellung, in der die Ringe (21, 27) drehbar zueinander sind, und einer Blockierstellung, in der die Ringe (21, 27) gegeneinander blockiert sind, beweglich ist, wobei ein Federelement (40) den Betätigungsring (41) über dessen von der Blockier- bis in die Freigabestellung reichenden Bewegungsweg in Richtung zu der Blockierstellung beaufschlagt.Proposed is a rotary wrench with a drive motor having a drive part, a transmission housing with gear elements and an outgoing from the transmission housing output shaft, a laterally offset arranged to the output shaft, fixedly connected to the transmission housing support leg and a pivot (5) from a connected to the drive part, drive-side ring (21) and connected to the transmission housing, the transmission-side ring (27). In order to create a rotary wrench, which allows a specific rotation of the drive member relative to the gear housing with high operating safety, it is proposed a coaxial with the output shaft (9) arranged actuating ring (41), with respect to the drive-side ring (21) and with respect to the transmission-side ring (27) is movably arranged and between a release position in which the rings (21, 27) are rotatable to each other, and a blocking position in which the rings (21, 27) are mutually blocked, is movable, wherein a spring element (40) the actuating ring (41) acted on its movement path extending from the blocking to the release position in the direction of the blocking position.

Description

Die Erfindung betrifft einen Drehschrauber mit einem einen Antriebsmotor aufweisenden Antriebsteil, einem Getriebegehäuse mit Getriebeelementen und einer aus dem Getriebegehäuse herausgeführten Ausgangswelle, einem seitlich versetzt zu der Ausgangswelle angeordneten, mit dem Getriebegehäuse fest verbundenen Stützfuß, und einem Drehgelenk aus einem mit dem Antriebsteil verbundenen, antriebsseitigen Ring und einem mit dem Getriebegehäuse verbundenen, getriebeseitigen Ring.The invention relates to a rotary wrench with a drive motor having a drive part, a transmission housing with gear elements and an outgoing from the transmission housing output shaft, a laterally offset arranged to the output shaft, fixedly connected to the transmission housing Stützfuß, and a hinge from a connected to the drive part, drive side Ring and connected to the transmission housing, the transmission side ring.

Bei derartigen Drehschraubern weist der Antriebsteil den Antriebsmotor, einen Handgriff und eine Schalteinrichtung auf. Während des Schraubvorgangs wird der Drehschrauber von dem Bediener über den Haltegriff gehalten. Sind, wie es in der US 4,155,278 beschrieben ist, das Antriebsteil und somit auch der Haltegriff gegenüber dem Getriebegehäuse in einzelnen Rastpositionen zueinander drehbar, so lässt sich das Antriebsteil nach dem Aufsetzen des Drehschraubers auf eine Schraubverbindung gegenüber dem Getriebegehäuse verdrehen. Dadurch lässt sich das Antriebsteil nach dem Aufsetzen des Drehschraubers auf eine Schraubverbindung in eine günstigere Bedienposition bringen, in der die Position des Haltegriffs für den Bediener angenehmer ist.In such rotary screwdrivers, the drive part on the drive motor, a handle and a switching device. During the screwing process, the screwdriver is held by the operator via the handle. Are how it is in the US 4,155,278 is described, the drive member and thus the handle relative to the gear housing in individual locking positions rotatable relative to each other, so can the drive member after placing the rotary wrench to a screw against the gear housing rotate. As a result, the drive part after putting the rotary wrench can be brought to a screw in a cheaper operating position in which the position of the handle is more comfortable for the operator.

Aus der WO 02/085568 A1 ist ein Drehschrauber bekannt, bei dem, aufgrund eines mittels einer Schalttaste des Antriebsteils sperrbaren Drehgelenks, der Bediener das in der Teilungsebene des Drehgelenks auftretende Drehmoment während des Schraubvorgangs nicht als Haltemoment aufbringen muss. Der damit einhergehende konstruktive Aufwand ist allerdings relativ hoch.From the WO 02/085568 A1 a screwdriver is known in which, due to a lockable by means of a switching button of the drive part swivel joint, the operator does not have to apply the torque occurring in the parting plane of the rotary joint during the screwing as a holding torque. The concomitant design effort, however, is relatively high.

Ein gattungsgemäßer Drehschrauber ist aus der WO 2015/036232 A1 bekannt. Auch bei diesem Drehschrauber ist das Antriebsteil über ein Drehgelenk mit dem Getriebegehäuse verbunden, so dass das Antriebsteil im Prinzip drehbar gegenüber dem Getriebegehäuse ist. Bestandteil des Drehgelenks ist auch eine Feststellvorrichtung. Diese ist außen mit einem Schaltring versehen, über den die Feststellvorrichtung einerseits zum Blockieren und andererseits zum Freigeben des Drehgelenks betätigbar ist. Dazu ist der Schaltring mittels einer Arretiervorrichtung entweder in der Blockierstellung, oder in der Freigabestellung arretierbar.A generic screwdriver is from the WO 2015/036232 A1 known. Also in this screwdriver, the drive part is connected via a rotary joint with the transmission housing, so that the drive part is in principle rotatable relative to the transmission housing. Part of the swivel joint is also a locking device. This is externally provided with a switching ring over which the locking device can be actuated on the one hand for blocking and on the other hand for releasing the rotary joint. For this purpose, the switching ring is locked by means of a locking device either in the blocking position, or in the release position.

Bei Arretierung in der Freigabestellung kann ein anschließend einsetzendes Anzugsmoment nicht über den Stützfuß auf benachbarte Maschinenteile als Widerlager abgeführt werden. Je nach Situation besteht die Gefahr, dass das Antriebsteil um seine Achse zu rotieren und zu schlagen beginnt. Dies kann zu einer Gefährdung für den Bediener führen.When locked in the release position, a subsequent tightening torque can not be dissipated via the support leg on adjacent machine parts as an abutment. Depending on the situation, there is a risk that the drive part will begin to rotate and hit around its axis. This can lead to a hazard to the operator.

Es ist daher die A u fgabe der vorliegenden Erfindung, einen Drehschrauber der eingangs genannten Art zu schaffen, welcher eine gezielte Drehbarkeit des Antriebsteils gegenüber dem Getriebegehäuse bei zugleich hoher Bediensicherheit ermöglicht.It is therefore the object of the present invention to provide a rotary wrench of the type mentioned, which allows a specific rotation of the drive member relative to the gear housing with high operating safety.

Zur Lösung dieser Aufgabe ist der erfindungsgemäße Drehschrauber durch die Merkmale des Anspruchs 1 definiert.To solve this problem, the screwdriver according to the invention is defined by the features of claim 1.

Der Drehschrauber besitzt ein Antriebsteil mit einer Antriebsvorrichtung. Hiervon getrennt besitzt er ein Getriebegehäuse, wobei das Getriebegehäuse einen Drehmomentwandler nach Bauart eines Getriebes sowie eine Ausgangswelle aufweist, die die Drehbewegung der Antriebsvorrichtung übertragen. Das Antriebsteil ist über ein Drehgelenk mit dem Getriebegehäuse verbunden, so dass das Antriebsteil im Prinzip drehbar gegenüber dem Getriebegehäuse ist, soweit ein Sperrelement die Teile nicht zueinander sperrt. Weiterhin vorhanden ist ein koaxial zu der Ausgangswelle angeordneter Betätigungsring, der gegenüber dem antriebsseitigen Ring und gegenüber dem getriebeseitigen Ring beweglich angeordnet ist. Er ist zwischen einer Freigabestellung, in der die Ringe drehbar zueinander sind, und einer Blockierstellung, in der die Ringe gegeneinander blockiert sind, beweglich.The screwdriver has a drive part with a drive device. Separated from this, it has a gear housing, wherein the gear housing has a torque converter according to the design of a transmission and an output shaft, which transmit the rotational movement of the drive device. The drive member is connected via a rotary joint to the transmission housing, so that the drive member is in principle rotatable relative to the transmission housing, as far as a blocking element does not lock the parts to each other. Furthermore, there is a coaxial with the output shaft arranged actuating ring, which is arranged to be movable relative to the drive-side ring and with respect to the transmission-side ring. It is movable between a release position, in which the rings are rotatable relative to one another, and a blocking position, in which the rings are blocked against one another.

Durch ein Federelement, welches den Betätigungsring über dessen gesamten, von der Blockier- bis in die Freigabestellung reichenden Bewegungsweg in Richtung zu der Blockierstellung beaufschlagt, kehrt das Sperrelement stets selbsttätig in jene Blockierstellung zurück, in der das Sperrelement die beiden Ringe, also den antriebsseitigen Ring und den getriebeseitigen Ring, gegeneinander blockiert. Für den Bediener besteht daher keine Gefahr, dass sich das Drehgelenk beim Anfahren des Drehschraubers unbeabsichtigt in der Freigabestellung befindet, etwa weil es arretiert ist, und so das gesamte Reaktionsmoment auf den Handgriff des Antriebsteils wirkt und es zu einem unkontrollierten Rotieren des Drehschraubers um dessen eigene Achse kommt.By a spring element which acts on the actuating ring over its entire, ranging from the blocking to the release position movement path toward the blocking position, the blocking element always automatically returns to those blocking position in which the blocking element, the two rings, ie the drive-side ring and the transmission-side ring, blocked against each other. Therefore, there is no danger to the operator that the rotary joint when starting the rotary screwdriver is inadvertently in the release position, for example because it is locked, and so the entire reaction torque acts on the handle of the drive part and it to an uncontrolled rotation of the rotary wrench to its own Axis comes.

Andererseits wird über das Drehgelenk erreicht, dass im Prinzip das Antriebsteil gegenüber dem Getriebegehäuse drehbar bleibt, so dass nach dem Aufsetzen des Drehschraubers auf eine Schraubverbindung das Antriebsteil in eine günstige Bedienposition verdreht werden kann. Diese Bedienposition ist eine Drehposition des Antriebsteils, die für den Bediener angenehm und sicher ist. Das Drehgelenk blockiert nach dem Einstellen dieser Bedienposition automatisch, so dass beim anschließenden Durchführen eines Schraubvorgangs in der Teilungsebene des Drehgelenks kein Drehmoment auftritt, welches vom Bediener gehalten werden müsste. Der Schraubvorgang kann somit stets gefahrlos und ohne die Gefahr einer Fehlbedienung durchgeführt werden.On the other hand, it is achieved via the rotary joint that, in principle, the drive part remains rotatable with respect to the transmission housing, so that after fitting the rotary wrench to a screw connection, the drive part is turned into a favorable operating position can. This operating position is a rotational position of the driving part, which is comfortable and safe for the operator. The hinge locks automatically after setting this operating position, so that when subsequently performing a screwing in the parting plane of the swivel joint no torque occurs, which would have to be held by the operator. The screwing can thus always be carried out safely and without the risk of incorrect operation.

Für den Drehschrauber kann eine Antriebsvorrichtung verwendet werden, die verglichen mit den üblicherweise verwendeten Universalmotoren ein höheres Drehmoment aufbringt. Beispielsweise ist es möglich, dass als Antriebsteil des erfindungsgemäßen Drehschraubers ein handelsüblicher akkubetriebener Bohrschrauber verwendet wird, der ein Drehmoment von bis zu 60 Nm erzeugt. Selbst dann ist der Drehschrauber für den Bediener auf angenehme Art und Weise verwendbar, wobei gleichzeitig eine hohe Sicherheit für den Bediener während des Schraubvorgangs gewährleistet ist.For the screwdriver, a drive device can be used, which applies a higher torque compared to the commonly used universal motors. For example, it is possible that a commercially available cordless drill driver is used as a driving part of the rotary wrench according to the invention, which generates a torque of up to 60 Nm. Even then, the wrench can be used by the operator in a pleasant manner, while ensuring a high level of safety for the operator during the screwing operation.

Gemäß einer Ausgestaltung des Drehschraubers dient mindestens eine Druck- oder Zugfeder als Lastelement. Ebenso ist es möglich, über den Umfang des Drehgelenks mehr als eine Druck- oder Zugfeder anzuordnen, z. B. zwei oder drei Druck- oder Zugfedern. Der Vorteil dieser Ausgestaltung besteht in der kompakten Bauweise, bei der der Durchmesser des Drehschraubers im Bereich des Drehgelenks nicht nennenswert vergrößert wird.According to one embodiment of the rotary screw, at least one compression or tension spring serves as a load element. It is also possible to arrange over the circumference of the rotary joint more than one compression or tension spring, z. B. two or three compression or tension springs. The advantage of this embodiment is the compact design, in which the diameter of the rotary wrench is not significantly increased in the region of the rotary joint.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der zugehörigen Zeichnungen, in denen ein Ausführungsbeispiel des erfindungsgemäßen Drehschraubers dargestellt ist. In den Zeichnungen zeigen:

Fig. 1
eine schematische Seitenansicht eines Drehschraubers,
Fig. 2
eine Schnittdarstellung im Bereich des Drehgelenks des Drehschraubers, wobei die Blockierstellung wiedergegeben ist,
Fig. 3
eine Schnittdarstellung im Bereich des Drehgelenks des Drehschraubers, wobei die Freigabestellung wiedergegeben ist.
Further details and advantages of the invention will become apparent from the following description of the accompanying drawings, in which an embodiment of the inventive rotary wrench is shown. In the drawings show:
Fig. 1
a schematic side view of a rotary screwdriver,
Fig. 2
a sectional view in the region of the rotary joint of the rotary screwdriver, wherein the blocking position is reproduced,
Fig. 3
a sectional view in the region of the rotary joint of the rotary screwdriver, wherein the release position is reproduced.

Fig. 1 zeigt einen Drehschrauber in einer Seitenansicht. Dieser weist ein Antriebsteil 3 auf, das eine Antriebsvorrichtung, beispielsweise einen Elektromotor, enthält. Das Antriebsteil 3 ist über ein Drehgelenk 5 mit dem Getriebegehäuse 7 eines Getriebeteils verbunden. Das Getriebegehäuse 7 nimmt in seinem Inneren verschiedene Drehlagerungen für einen Drehmomentwandler, beispielsweise ein aus Getriebeelementen zusammengesetztes Planetengetriebe, sowie für eine Ausgangswelle 9 auf, die an ihrem Ende mit einem Mehrkant aus dem Getriebegehäuse 7 herausragt. Auf die Ausgangswelle 9 kann daher eine Schlüsselnuss aufgesetzt werden. Fig. 1 shows a screwdriver in a side view. This has a drive part 3, which contains a drive device, for example an electric motor. The drive part 3 is connected via a rotary joint 5 to the transmission housing 7 of a transmission part. The gear housing 7 takes in its interior different pivot bearings for a Torque converter, for example, composed of gear elements planetary gear, as well as for an output shaft 9, which protrudes at its end with a polygon from the gear housing 7. On the output shaft 9 therefore a key nut can be placed.

Das Antriebsteil 3 weist einen Energiespeicher 11 für elektrische Energie auf, beispielsweise einen Akkumulator, der die als Elektromotor ausgebildete Antriebsvorrichtung mit elektrischer Energie versorgt. Dadurch ist der erfindungsgemäße Drehschrauber 1 unabhängig von einem Stromnetz betreibbar.The drive part 3 has an energy store 11 for electrical energy, for example an accumulator which supplies the drive device designed as an electric motor with electrical energy. As a result, the rotary wrench 1 according to the invention is operated independently of a power grid.

Ebenso kann das Antriebsteil 3 auch einen über ein elektrisches Anschlusskabel mit elektrischer Energie versorgten Motor enthalten, soweit dieser mit einem ausreichend hohen Ausgangsmoment arbeitet.Likewise, the drive part 3 may also contain a powered by an electrical connection cable with electric motor motor, as far as it works with a sufficiently high output torque.

Über einen Schalter 13 ist der Antrieb regelbar. Ferner weist das Antriebsteil 3 einen zur Seite abstehenden Haltegriff 15 auf, über den der Bediener den Drehschrauber 1 halten und bis zum Beginn bzw. beim Schraubprozess handhaben kann.About a switch 13, the drive is adjustable. Furthermore, the drive part 3 has a side projecting handle 15, over which the operator can hold the screwdriver 1 and handle until the beginning or during the screwing process.

Durch das Planetengetriebe in dem Getriebegehäuse 7 wird das von der Antriebsvorrichtung des Antriebsteils 3 erzeugte Drehmoment verstärkt, und auf die Ausgangswelle 9 übertragen.By the planetary gear in the gear housing 7, the torque generated by the drive device of the drive part 3 is amplified, and transmitted to the output shaft 9.

Seitlich an dem Getriebegehäuse 7 ist ein starrer Stützfuß 17 angebracht, über den sich das Getriebegehäuse 7 und somit der Drehschrauber 1 im Betrieb gegen ein nicht dargestelltes ortsfestes Maschinenteil als Widerlager abstützen kann.Laterally on the gear housing 7, a rigid support leg 17 is attached, via which the gear housing 7 and thus the screwdriver 1 can be supported during operation against a non-illustrated stationary machine part as an abutment.

Über das koaxial zur Ausgangswelle 9 angeordnete Drehgelenk 5 ist das Antriebsteil 3 drehbar mit dem Getriebegehäuse 7 verbunden. Auf diese Weise lässt sich der Drehschrauber 1 in vorteilhafter Weise auf eine Schraubverbindung aufsetzen, wobei der Antriebsteil 3 anschließend in eine Bedienposition, die für den Bediener bequem ist, verdreht werden kann. Zum Beispiel ist es möglich, den Drehschrauber 1 auf eine Schraubverbindung aufzusetzen und anschließend die Antriebsvorrichtung vorsichtig zu betätigen. Das Getriebegehäuse 7 kann sich aufgrund des Drehgelenkes 5 gegenüber dem Antriebsteil 3 drehen. Hilfreich kann auch sein, wenn sich beim Einschalten des Antriebsteils das Getriebegehäuse 7 um seine Längsachse dreht und den Stützfuß 17 langsam schwenkt, bis dieser gegen ein ortsfestes Widerlager stößt. Dann erst wird das Drehgelenk 5 blockiert. Denn das Drehgelenk 5 weist eine Feststellvorrichtung auf, über die das Drehgelenk 5 automatisch, also ohne aktives Zutun des Bedieners, blockierbar ist. Dadurch wird verhindert, dass infolge einer Fehlbedienung das Ausgangsdrehmoment in der Teilungsebene des Drehgelenks 5 auf den Bediener übertragen wird.About the coaxial with the output shaft 9 arranged rotary joint 5, the drive part 3 is rotatably connected to the transmission housing 7. In this way, the screwdriver 1 can advantageously be placed on a screw, wherein the drive part 3 then in an operating position that is comfortable for the operator, can be rotated. For example, it is possible to set the screwdriver 1 on a screw connection and then to operate the drive device carefully. The gear housing 7 can rotate relative to the drive part 3 due to the rotary joint 5. It can also be helpful if, when the drive part is switched on, the gear housing 7 rotates about its longitudinal axis and slowly pivots the support leg 17 until it comes into abutment against a stationary abutment. Only then is the pivot 5 blocked. For the rotary joint 5 has a locking device over which the hinge 5 automatically, so without active intervention of the operator, can be blocked. This prevents that due to a faulty operation, the output torque in the division plane of the rotary joint 5 is transmitted to the operator.

In Fig. 2 ist das Drehgelenk 5 in einem Querschnitt dargestellt. Das Drehgelenk 5 besteht aus einem ersten Ring 21, der mit dem Antriebsteil 3 und insbesondere dessen Gehäuse drehfest und vorzugsweise starr verbunden ist. In dem ersten Ring 21 ist drehbar ein zweiter Ring 27 gelagert. Der zweite Ring 27 ist drehfest und vorzugsweise starr mit dem Getriebegehäuse 7 des Getriebeteils verbunden.In Fig. 2 the rotary joint 5 is shown in a cross section. The rotary joint 5 consists of a first ring 21 which is non-rotatably and preferably rigidly connected to the drive part 3 and in particular its housing. In the first ring 21, a second ring 27 is rotatably mounted. The second ring 27 is rotationally fixed and preferably rigidly connected to the transmission housing 7 of the transmission part.

Zwischen dem ersten Ring 21 und dem zweiten Ring 27 ist eine Feststellvorrichtung aktiv, die sich zwar von Hand deaktivieren lässt, aber stets von selbst wieder in ihre Aktivstellung zurückkehrt.Between the first ring 21 and the second ring 27, a locking device is active, although it can be deactivated by hand, but always returns by itself to its active position.

Dazu ist einer der beiden Ringe 21, 27, hier der antriebsseitige Ring 21, mit Öffnungen 30 oder Aussparungen versehen, in denen sich Kugeln 39 befinden, die als Sperrelemente dienen. Zugleich ist der andere der beiden Ringe 21, 27, hier der getriebeseitige Ring 27, mit gleichmäßig über seinen Umfang verteilten Vertiefungen 32 versehen. An diesen Vertiefungen 32 befinden sich Sperrgegenflächen 45, in welche die Sperrelemente 39, hier die jeweils innere Halbschale 44 einer Kugel, eingreifen können, um so die beiden Ringe 21, 27 in Umfangsrichtung durch Formschluss gegeneinander zu sperren, und so das Drehgelenk 5 zu blockieren.For this purpose, one of the two rings 21, 27, here the drive-side ring 21, provided with openings 30 or recesses in which balls 39 are located, which serve as locking elements. At the same time the other of the two rings 21, 27, here the transmission-side ring 27, provided with evenly distributed over its circumference recesses 32. At these recesses 32 are locking mating surfaces 45, in which the locking elements 39, here the respective inner half shell 44 of a ball, can engage, so as to lock the two rings 21, 27 in the circumferential direction by positive engagement against each other, and so to block the hinge 5 ,

Das Sperren der Sperrelemente 39 erfolgt durch das Ausüben von Druck auf die Sperrelemente 39. Diesen Druck erzeugt ein dauernd durch Federkraft beaufschlagter Betätigungsring 41. In Fig. 2 dargestellt ist ein Betätigungsring 41, der in Drehrichtung durch zwei gleichartig gestaltete Druckfedern 40 beaufschlagt ist. Der Betätigungsring 41 ist, ebenso wie die beiden Ringe 21, 27, koaxial zu der Ausgangswelle 9 angeordnet, und seine Drehachse fällt mit der Ausgangswelle 9 zusammen.The blocking of the blocking elements 39 takes place by the exertion of pressure on the blocking elements 39. This pressure generates a continuously acted upon by spring force actuating ring 41. In Fig. 2 shown is an actuating ring 41 which is acted upon in the direction of rotation by two similarly shaped compression springs 40. The actuating ring 41 is, as well as the two rings 21, 27, arranged coaxially with the output shaft 9, and its axis of rotation coincides with the output shaft 9.

Die als Sperrelemente 39 dienenden Kugeln sind über den Umfang des Drehgelenks mehrfach vorhanden, beim Ausführungsbeispiel insgesamt vierfach. Jede Kugel 39 befindet sich in einer Öffnung 30 des ersten Rings 21, wobei die Öffnung 30 in Umfangsrichtung die Größe der Kugel aufweist oder nur geringfügig größer ist als die Kugel.The serving as locking elements 39 balls are multiple times over the circumference of the rotary joint, in the embodiment a total of four times. Each ball 39 is located in an opening 30 of the first ring 21, wherein the opening 30 in the circumferential direction has the size of the ball or only slightly larger than the ball.

Der Durchmesser der Kugeln 39 ist größer als die radiale Dicke des ersten Rings 21, wodurch jede Kugel 39 über den Ring 21 nach radial außen vorsteht und/oder nach radial innen über den Ring 21 vorsteht.The diameter of the balls 39 is greater than the radial thickness of the first ring 21, whereby each ball 39 protrudes radially outwardly beyond the ring 21 and / or projects radially inward beyond the ring 21.

In der in Fig. 2 wiedergegebenen Blockierstellung des Drehgelenks 5 stehen die Kugeln 39 nach radial innen vor, wobei sich die nach innen weisende Halbschale 44 jeder Kugel in die entsprechende Vertiefung 32 erstreckt, und bei Aufbringen eines Drehmoments gegen die Sperrgegenfläche 45 formschlüssig abstützt. Dadurch kommt es zu einem Blockieren des ersten Rings 21 gegenüber dem zweiten Ring 27.In the in Fig. 2 reproduced blocking position of the rotary joint 5, the balls 39 project radially inward, wherein the inwardly facing half-shell 44 of each ball extends into the corresponding recess 32, and positively supported when applying a torque against the locking mating surface 45. This results in a blocking of the first ring 21 with respect to the second ring 27th

In der in Fig. 3 wiedergegebenen Freigabestellung des Drehgelenks 5 können die Kugeln 39 nach außen ausweichen und nehmen dann eine radial weiter außen liegende Position ein. Ihre nach außen weisenden Halbschalen finden hierbei in einem Freigabeabschnitt 49 an der Innenseite des Betätigungsrings 41 Platz. In Umfangsrichtung des Betätigungsrings 41 schließt sich an jeden Freigabeabschnitt 49 ein Sperrabschnitt 48 an, der sich ebenfalls an der Innenseite des Betätigungsrings befindet. Der Freigabeabschnitt 49 befindet sich auf einem größeren Radius als der Sperrabschnitt 48.In the in Fig. 3 reproduced release position of the rotary joint 5, the balls 39 can escape to the outside and then assume a radially outward position. Their outwardly facing half-shells find here in a release portion 49 on the inside of the actuating ring 41 space. In the circumferential direction of the actuating ring 41, a locking portion 48 connects to each release portion 49, which is also located on the inside of the actuating ring. The release portion 49 is located at a larger radius than the lock portion 48.

Wird der Betätigungsring 41 in Umfangsrichtung gedreht, gelangt entweder der Sperrabschnitt 48 oder der Freigabeabschnitt 49 gegen die Außenseite der jeweiligen Kugel 39. Damit können die Kugeln entweder nach außen ausweichen, so dass kein Blockieren zwischen den beiden Ringen 21, 27 stattfindet (Fig. 3), oder sie werden in ihrer radial einwärts angeordneten Position gehalten, in der die Kugeln 39 als Sperrelemente wirken und die beiden Ringe 21, 27 in Umfangsrichtung gegeneinander sperren (Fig. 2).If the actuating ring 41 is rotated in the circumferential direction, either the locking portion 48 or the release portion 49 comes against the outside of the respective ball 39. Thus, the balls can either escape to the outside, so that no blocking between the two rings 21, 27 takes place ( Fig. 3 ), or they are held in their radially inwardly disposed position in which the balls 39 act as locking elements and the two rings 21, 27 in the circumferential direction against each lock ( Fig. 2 ).

Ein Arretieren findet nur in der einen dieser beiden Stellungen statt, nämlich in der Blockierstellung nach Fig. 2, in welcher jede Kugel 39 innen in die Sperrgegenfläche 45 eingreift, und außen gegen den Sperrabschnitt 48 abgestützt ist. Denn in dieser Blockierstellung wird der Betätigungsring 41 aufgrund der Wirkung des Federelements 40 automatisch gehalten, und insoweit arretiert.Locking takes place only in one of these two positions, namely in the blocking position Fig. 2 in which each ball 39 engages inside in the locking counter-surface 45, and is supported outside against the locking portion 48. Because in this blocking position of the actuating ring 41 is held automatically due to the action of the spring element 40, and so far arrested.

Um die Blockierstellung aufzuheben, muss der Betätigungsring 41 entgegen der Kraft der Druckfedern 40 aktiv gedreht werden, ohne dass er bei Erreichen der anderen Endstellung, also der Freigabestellung, arretiert. Dieses Nicht-Arretieren in der Freigabestellung hat zur Folge, dass, nach dem Loslassen des Betätigungsrings 41, dieser aufgrund seiner dauernden Federbelastung sofort wieder in die Blockierstellung zurückschnappt, wodurch die Sperrelemente 39 nach innen gedrückt werden, bis sie die beiden Ringe 21, 27 wieder in Umfangsrichtung gegeneinander blockieren. Dies wird erleichtert, wenn der Freigabeabschnitt 49 über eine Rampe 49a in den Sperrabschitt 48 übergeht.In order to remove the blocking position, the actuating ring 41 must be actively rotated against the force of the compression springs 40, without it being locked upon reaching the other end position, ie the release position. This non-locking in the release position has the consequence that, after releasing the actuating ring 41, this immediately snaps back into the blocking position due to its continuous spring load, whereby the locking elements 39 are pressed inward until they the two rings 21, 27 again Block against each other in the circumferential direction. This is facilitated if the release section 49 merges into the locking section 48 via a ramp 49a.

Zum erleichterten Drehen des Betätigungsrings 41 in seine Freigabestellung ist der Betätigungsring 41 an seiner Außenseite mit einer seine Griffigkeit erhöhenden Riffelung 50 versehen.For easier turning of the actuating ring 41 in its release position of the actuating ring 41 is provided on its outer side with a grip increasing its corrugation 50.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
DrehschrauberScrewdrivers
33
Antriebsteildrive part
55
Drehgelenkswivel
77
Getriebegehäusegearbox
99
Ausgangswelleoutput shaft
1111
Energiespeicherenergy storage
1313
Schalterswitch
1515
Haltegriffhandle
1717
StützfußSupport foot
2121
erster Ringfirst ring
2727
zweiter Ringsecond ring
3030
Öffnungopening
3232
Vertiefungdeepening
3939
Sperrelement, KugelBlocking element, ball
4040
Federelementspring element
4141
Betätigungsringactuating ring
4444
Sperrfläche, Halbschale der KugelSperrfläche, half shell of the ball
4545
SperrgegenflächeBlocking counter surface
4848
Sperrabschnittblocking portion
4949
Freigabeabschnittrelease section
49a49a
Ramperamp
5050
Riffelungknurl

Claims (8)

Drehschrauber mit einem einen Antriebsmotor aufweisenden Antriebsteil (3), einem Getriebegehäuse (7) mit Getriebeelementen und einer aus dem Getriebegehäuse herausgeführten Ausgangswelle (9), einem seitlich versetzt zu der Ausgangswelle (9) angeordneten, mit dem Getriebegehäuse (7) fest verbundenen Stützfuß (17), einem Drehgelenk (5) aus einem mit dem Antriebsteil (3) verbundenen, antriebsseitigen Ring (21) und einem mit dem Getriebegehäuse (7) verbundenen, getriebeseitigen Ring (27), einem koaxial zu der Ausgangswelle (9) angeordneten Betätigungsring (41), der gegenüber dem antriebsseitigen Ring (21) und gegenüber dem getriebeseitigen Ring (27) beweglich angeordnet ist und zwischen einer Freigabestellung, in der die Ringe (21, 27) drehbar zueinander sind, und einer Blockierstellung, in der die Ringe (21, 27) gegeneinander blockiert sind, beweglich ist, einem Federelement (40), welches den Betätigungsring (41) über dessen von der Blockier- bis in die Freigabestellung reichenden Bewegungsweg in Richtung zu der Blockierstellung beaufschlagt. Wrench with a drive part (3) having a drive motor, a gear housing (7) with gear elements and an output shaft (9) led out of the gear housing, a support foot (17) arranged laterally offset from the output shaft (9) and fixed to the transmission housing (7), a rotary joint (5) comprising a drive-side ring (21) connected to the drive part (3) and a transmission-side ring (27) connected to the transmission housing (7), a coaxial with the output shaft (9) arranged actuating ring (41) which is arranged to be movable relative to the drive-side ring (21) and with respect to the transmission-side ring (27) and between a release position in which the rings (21, 27) are rotatable to each other , and a blocking position, in which the rings (21, 27) are blocked against each other, is movable, a spring element (40) which acts on the actuating ring (41) via its movement path extending from the blocking to the release position in the direction of the blocking position. Drehschrauber nach Anspruch 1, dadurch gekennzeichnet, dass der Betätigungsring (41) drehbar gegenüber dem antriebsseitigen Ring (21) und gegenüber dem getriebeseitigen Ring (27) ausgebildet ist.Screwdriver according to claim 1, characterized in that the actuating ring (41) is designed to be rotatable with respect to the drive-side ring (21) and with respect to the transmission-side ring (27). Drehschrauber nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass in der Teilungsebene des Drehgelenks (5) mindestens ein Sperrelement (39) angeordnet ist, dass der Betätigungsring (41) mit einem Sperrabschnitt (48) versehen ist, und dass nur in der Blockierstellung des Betätigungsrings (41) das Sperrelement (39) gegen den Sperrabschnitt (48) abgestützt ist.Screwdriver according to claim 1 or 2, characterized in that in the parting plane of the rotary joint (5) at least one locking element (39) is arranged, that the actuating ring (41) with a locking portion (48) is provided, and that only in the blocking position of Actuating ring (41) the locking element (39) against the locking portion (48) is supported. Drehschrauber nach Anspruch 3, dadurch gekennzeichnet, dass nur in der Bockierstellung des Betätigungsrings (41) das Sperrelement (39) formschlüssig in eine Sperrgegenfläche (45) an einer Außenfläche eines der beiden Ringe (21, 27) eingreift.Screwdriver according to claim 3, characterized in that only in the Bockierstellung of the actuating ring (41) the locking element (39) positively in a locking counter surface (45) on an outer surface of one of the two rings (21, 27) engages. Drehschrauber nach Anspruch 4, dadurch gekennzeichnet, dass das Sperrelement (39) als Kugel ausgebildet ist, die mit ihrer einen Halbschale in die Sperrgegenfläche (45) eingreift, und an ihrem der Halbschale abgewandten Umfangsabschnitt gegen den Sperrabschnitt (48) des Betätigungsrings (41) abgestützt ist.Screwdriver according to Claim 4, characterized in that the blocking element (39) is designed as a ball which engages with its one half-shell in the locking mating surface (45), and at its peripheral portion facing away from the half-shell against the locking portion (48) of the actuating ring (41). is supported. Drehschrauber nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass sich der Sperrabschnitt (48) an der Innenseite des Betätigungsrings (41) befindet.Screwdriver according to one of the preceding claims, characterized in that the locking portion (48) is located on the inside of the actuating ring (41). Drehschrauber nach Anspruch 6, dadurch gekennzeichnet, dass sich in Umfangsrichtung des Betätigungsrings (41) an den Sperrabschnitt (48) ein Freigabeabschnitt (49) anschließt, und dass sich der Freigabeabschnitt (49) auf einem größeren Radius als der Sperrabschnitt (48) befindet.Screwdriver according to claim 6, characterized in that in the circumferential direction of the actuating ring (41) to the locking portion (48) a release portion (49) connects, and that the release portion (49) is located on a larger radius than the locking portion (48). Drehschrauber nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Betätigungsring (41) an seiner Außenseite mit einer die Griffigkeit erhöhenden Riffelung (50) versehen ist.Screwdriver according to one of the preceding claims, characterized in that the actuating ring (41) is provided on its outer side with a ribbing (50) which increases the grip.
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US20170021480A1 (en) 2017-01-26
DE102015111570A1 (en) 2017-01-19
EP3120974B1 (en) 2018-12-12
KR20170009790A (en) 2017-01-25

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