EP0163009B1 - Power-driven wrench with an action arm and a reaction arm, preferably constructed as a housing - Google Patents

Power-driven wrench with an action arm and a reaction arm, preferably constructed as a housing Download PDF

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Publication number
EP0163009B1
EP0163009B1 EP85101942A EP85101942A EP0163009B1 EP 0163009 B1 EP0163009 B1 EP 0163009B1 EP 85101942 A EP85101942 A EP 85101942A EP 85101942 A EP85101942 A EP 85101942A EP 0163009 B1 EP0163009 B1 EP 0163009B1
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EP
European Patent Office
Prior art keywords
arm
power
tensioning wheel
reaction
power arm
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
EP85101942A
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German (de)
French (fr)
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EP0163009A2 (en
EP0163009A3 (en
Inventor
Hans-Bernd Mierbach
Gustav Frohn
Olaf Blockisch
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Enerpac Tool Group Corp
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Applied Power Inc
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Publication date
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Publication of EP0163009A3 publication Critical patent/EP0163009A3/en
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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
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type
    • B25B21/005—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type driven by a radially acting hydraulic or pneumatic piston

Definitions

  • the tensioning wheel, the power arm that surrounds the tensioning wheel, and the reaction arm which in turn completely engages around the power arm.
  • the reaction arm designed as a housing also has an opening at its first end region which runs centrally to the axis and in which the circular, first end region of the power arm is guided on the outside. Because of these three parts arranged concentrically and in shells, the distance from an inner opening of the tensioning wheel to the outside of the reaction arm is quite large in the area of its first end area.
  • the clearance of the known power screwdriver according to DE-OS 30 08 381 is determined by the outer diameter of the first end region of the reaction arm. Regardless of the tensioning wheels used, this clearance is always the same.
  • the free dimension is still acceptable when using the tensioning wheel with the largest hexagon socket, when using the tensioning wheel with the smallest hexagon socket, the free dimension is disadvantageously large.
  • a special power wrench would have to be manufactured for all common widths at least. However, this would result in a very high outlay in terms of production, storage and use.
  • power screwdrivers are therefore manufactured for a certain range of nominal wrenches in which the required tensioning wheels can be used. But then the goal is not to keep the clearance for a wrench about as large as it is for a ring wrench.
  • the decisive difference compared to the previously known power screwdriver according to DE-OS 30 08 381 is that the power arm is no longer supported in a circular opening of the reaction arm, so the guide between the power arm and reaction arm does not extend over 360 °, but this guide is between the axis and the second end region of the arms and extends over a maximum of 180 °.
  • the reaction arm no longer surrounds the power arm (as in the previously known power screwdriver), but ends above a line which runs transversely to the longitudinal direction of the reaction arm and through the axis.
  • the clearance of the power wrench described in this way, in particular the radial clearance is therefore no longer determined by the external dimensions of the reaction arm, but only by the circular, free end of the power arm.
  • the inventive design of the power wrench can be realized on a power wrench according to DE-OS 30 08 381, here preferably the power cylinder is arranged in the reaction arm in order to be able to carry out the assembly of power arm and tensioning wheel including pawl as simply as possible.
  • a power wrench according to DE-OS 34 07 126 (published on August 29, 1985) is used, in which an approximately pear-shaped force arm is provided, which is located within the cylinder bore with its smaller drive head and engages in a recess in the piston, wherein the axis line of the cylinder bore extends transversely to the longitudinal direction of the power cylinder.
  • the reaction arm is designed as a housing and preferably consists of a housing part and bearing shells that can be fastened laterally and with simple means to this housing part, in which the guide for the power arm is formed.
  • the power arm can then be pulled out of the housing part. This makes replacing the power arms particularly easy.
  • the power screwdriver shown in the figures has a reaction arm 1 designed as a housing and a power arm 2, each of which is guided at its first end regions, which are lower in the figures, about a common axis 3 and can be pivoted relative to one another.
  • the power arm 2 has a circular bore 4 at its first, lower end region, in which a tensioning wheel 5 is rotatably mounted about the axis 3. It has an internal hexagon 6 and on its outer, largely cylindrical lateral surface an outwardly projecting toothing 7. With this toothing 7, a pawl 8 interacts, which is arranged in a bay 9 of the power arm 2.
  • a hydraulic power cylinder comprising a cylinder 10 and a piston 11 is arranged in the reaction arm, the power transmission between this piston 11 and dev power arm 2 takes place in accordance with the teaching of DE-OS 3407126, the disclosure content of which is an integral part of the present application.
  • the reaction arm 1 is composed of three parts that can be easily dismantled: on the one hand from a housing part 12, in which the hydraulic power cylinder, the connections and other parts are located, and on the other hand from two bearing shells 13, 14, which are located in their upper part End area are flush and positively fitted into a recess 15 of the housing part 12.
  • the bearing shells 13, 14 are connected to the housing part 12 by means of a plurality of easily detachable screws 16.
  • the housing part 12 already ends at a large distance from the axis 3, in the exemplary embodiment on a line that runs parallel to the working direction of the hydraulic power cylinder and through the pawl 8, it therefore does not determine the clearance of the power wrench.
  • the two bearing shells 13, 14 protrude relative to the housing part 12 in the direction of the axis 3, but they are in front of a line which also runs parallel to the axis 17 of the hydraulic power cylinder and passes through the axis 3.
  • the bearing shells 13, 14 therefore do not extend into a half space around the axis 3, which is denoted by the arrows 18 in FIG. 1; in other words, they do not determine the clearance, in particular the radial clearance of the power wrench.
  • a projection 19 is provided which, when the bearing shells 13, 14 are mounted, points inwards and extends over approximately 170 °. It serves to guide the power arm 2 about the axis 3, which will be discussed in more detail below.
  • the power arm consists of two half-arms 20, 21 of equal thickness (see FIG. 2), in each of which part of the bay 9 is milled out. Except for the course of this bay, which is a mirror image, the two half arms 20, 21 are congruent.
  • the . Both half arms 20, 21 are connected to one another by suitable means, for example laterally projections 22, other connecting means and locations are possible.
  • the force arm 2 composed of the two half arms 20, 21 is essentially pear-shaped, has an output head 23 located in FIGS. 1 and 2, which is located at least partially within the cylinder 10 and in a recess 24 adapted to it on both sides of the piston 11 (see Figure 2) is inserted. It is carried in both directions of movement of the piston 11.
  • the pawl 8 is located entirely within the power arm 2, so that it can be replaced without being in the mechanics the pawl 8 can intervene.
  • the pawl 8 in the engagement position shown in FIG. 1 only rests with its surface 25 against the obliquely extending snap-in flank 26 without striking its front surface directly at the edge of the bay 9. This ensures that even when the teeth of the pawl 8 or the teeth 7 wear, a precise engagement position is always achieved without this engagement position being predetermined by a stationary stop.
  • FIG. 2 shows, in the two half arms 20, 21 of the power arm 2, a circular arc, concentric to the axis 3 and extending over about 90 ° extending guide groove 27 is provided, in which the projection 19 engages with a precise fit and largely rattle-free, so that an arc guide is formed.
  • This guide takes over the task of the circular-shaped guide surface of the reaction arm in the power wrench according to DE-OS 34 07 126. As the figures show, this guide is located between the axis 3 and the second end regions of the arms 1, 2 located at the top in the figures , so that this guide is not in the half-space indicated by the arrows 18.
  • the practical design of the guide is arbitrary in itself, the guide shown from the projection 19 and the guide groove 27 can be seen essentially as a favorable embodiment. Kinematic reversal is possible, furthermore any other guides are possible as long as they are outside the lower half space (arrows 18) and do not impair the passage through the hexagon 6 on both sides. This free passage through the hexagon 6 is a feature which is advantageous for the practical use of the power screwdriver and has already been implemented in the previously known power screwdrivers.
  • the power wrench shown in the figures is equipped with a tensioning wheel 5 with the largest possible hexagon socket. If you want to use the power wrench for screws or nuts with a smaller wrench size, the tensioning wheel 5 is not replaced, but the complete, approximately pear-shaped and all-round closed unit consisting of the two arms 20, 21 forming the power arm 2, the tensioning wheel 5 and the pawl 8 together with accessories , such as an internal pawl spring. To replace this unit with another, it is sufficient to unscrew the two bearing shells 13, 14 from the housing part 12, the fork-shaped force arm 2 in its second (upper) end region can then be inserted into the downwardly open recess 24 via the drive head 23.
  • a spindle holder with an adjustable spindle can be detachably attached to the left-hand part of the housing part 12 in FIG. 1, the spindle being located above or below the levels of the bearing shells 13, 14. It is adjusted so that it strikes with its front end and forms the abutment for the reaction arm 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Description

Die Erfindung bezieht sich auf einen Kraftschrauber mit

  • -einem Kraftarm und einem Reaktionsarm, die jeweils an einem ihrer Endbereiche unter Eingreifen eines an dem einen Arm vorgesehenen kreisbogenförmigen Vorsprungs in eine koaxiale kreisbogenförmige Nut in dem anderen Arm um eine gemeinsame Achse gegeneinander schwenkbar geführt sind,
  • -einem um die Achse drehbar in einer Bohrung im ersten Endbereich des Kraftarmes gelagerten und eine Verzahnung aufweisenden Spannrad und einer mit dem Spannrad zusammenwirkenden, am Kraftarm angeordneten Sperrklinke, die in der einen Schwenkrichtung des Kraftarmes in die Zähne des Spannrades eingreift und in der anderen Schwenkrichtung des Kraftarmes über die Zähne des Spannrades hinwegrutscht, und
  • -einem in der Nähe ihrer anderen Endbereiche zwischen dem Kraftarm und dem Reaktionsarm angreifenden Hydraulikantrieb mit einem Zylinder und einem darin verschiebbaren Kolben.
The invention relates to a power wrench
  • a power arm and a reaction arm, each of which is guided at one of its end regions with the engagement of an arc-shaped projection provided on one arm in a coaxial arc-shaped groove in the other arm so as to be pivotable relative to one another about a common axis,
  • - A tensioning wheel that is rotatably mounted about the axis in a bore in the first end region of the power arm and has a toothing, and a pawl that interacts with the tensioning wheel and is arranged on the power arm and engages in the teeth of the tensioning wheel in one pivoting direction of the power arm and in the other pivoting direction of the power arm slips over the teeth of the tensioning wheel, and
  • a hydraulic drive engaging near its other end regions between the power arm and the reaction arm with a cylinder and a piston displaceable therein.

Bei diesem, aus der DE-OS 30 08 381 vorbekannten Kraftschrauber sind konzentrisch und von innen nach außen gesehen das Spannrad, der Kraftarm, der das Spannrad umgreift, und der Reaktionsarm angeordnet, der wiederum den Kraftarm vollständig umgreift. Hierzu hat auch der als Gehäuse ausgebildete Reaktionsarm an seinem ersten Endbereich eine Öffnung, die zentrisch zur Achse verläuft und in der der kreisrund ausgebildete, erste Endbereich des Kraftarms außenseitig geführt ist. Auf Grund dieser drei konzentrisch und schalenweise angeordneten Teile ist der Abstand von einer Innenöffnung des Spannrades bis zur Außenseite des Reaktionsarms im Bereich von dessen ersten Endbereich recht groß. Anders ausgedrückt ist um eine Mutter oder Schraube, auf die das Spannrad mit seinem Innensechskant aufgesetzt wird, ein relativ größer Freiraum nötig, damit der vorbekannte Kraftschrauber aufgesetzt werden kann. Nun werden Kraftschrauber der eingangs genannten Art typischerweise für das Verspannen von Flanschen benutzt. Der Freiraum um eine Spannmutter oder -schraube einer derartigen Flanschverbindung ist zum Teil durch die Entfernung zur nächsten, benachbarten Schraube bzw. Mutter bestimmt, typischerweise aber ist dieser Freiraum noch größer als der radial nach innen freibleibende Raum. Bei einer Flanschverbindung von Rohren ist man beispielsweise bestrebt, den Abstand zwischen den Spannschrauben und der Außenwand der zu verbindenden Rohre möglichst gering zu machen, entsprechend gering ist der radiale Freiraum.In this, known from DE-OS 30 08 381 power wrench concentric and seen from the inside out, the tensioning wheel, the power arm that surrounds the tensioning wheel, and the reaction arm, which in turn completely engages around the power arm. For this purpose, the reaction arm designed as a housing also has an opening at its first end region which runs centrally to the axis and in which the circular, first end region of the power arm is guided on the outside. Because of these three parts arranged concentrically and in shells, the distance from an inner opening of the tensioning wheel to the outside of the reaction arm is quite large in the area of its first end area. In other words, a relatively large amount of space is required around a nut or screw on which the tensioning wheel with its hexagon socket is placed so that the previously known power screwdriver can be placed on. Now power wrenches of the type mentioned are typically used for bracing flanges. The free space around a clamping nut or screw of such a flange connection is determined in part by the distance to the next, adjacent screw or nut, but typically this free space is even larger than the space remaining free radially inwards. In the case of a flange connection of pipes, efforts are made, for example, to make the distance between the clamping screws and the outer wall of the pipes to be connected as small as possible, and the radial clearance is correspondingly small.

Das Freimaß des vorbekannten Kraftschraubers nach der DE-OS 30 08 381 ist durch den Außendurchmesser des ersten Endbereichs des Reaktionsarms bestimmt. Unabhängig von den jeweils eingesetzten Spannrädern ist dieses Freimaß stets dasselbe. Bei dem vorbekannten Kraftschrauber ist das Freimaß bei Einsatz des Spannrades mit dem größten Innensechskant noch zu vertreten, bei Einsatz des Spannrades mit dem kleinsten Innensechskant ist das Freimaß nachteilig groß. Um hier Abhilfe zu schaffen, müßte zumindest für alle gängigen Schlüssenweiten jeweils ein spezieller Kraftschrauber gefertigt werden. Dies aber würde einen sehr hohen Aufwand hinsichtlich der Fertigung, Lagerung und beim Einsatz nach zich ziehen. Normalerweise werden daher Kraftschrauber für einen gewissen Bereich von Schlüsselnennweiten gefertigt, in die die jeweils benötigten Spannräder einsetzbar sind. Dann aber ist das Ziel, das Freimaß bei einem Kraftschrauber für alle Schlüsselweiten etwa so groß zu halten, wie es bei einem Ringschraubenschlüssel ist, nicht zu erreichen.The clearance of the known power screwdriver according to DE-OS 30 08 381 is determined by the outer diameter of the first end region of the reaction arm. Regardless of the tensioning wheels used, this clearance is always the same. With the known power screwdriver, the free dimension is still acceptable when using the tensioning wheel with the largest hexagon socket, when using the tensioning wheel with the smallest hexagon socket, the free dimension is disadvantageously large. In order to remedy this, a special power wrench would have to be manufactured for all common widths at least. However, this would result in a very high outlay in terms of production, storage and use. Normally, power screwdrivers are therefore manufactured for a certain range of nominal wrenches in which the required tensioning wheels can be used. But then the goal is not to keep the clearance for a wrench about as large as it is for a ring wrench.

Hiervon ausgehend ist es Aufgabe der Erfindung, die Nachteile des vorbekannten Kraftschraubers nach der DE-OS 30 08 381 zu vermeiden und den Kraftschrauber der eingangs genannten Art dahingehend zu verbessern, daß das Freimaß geringer ist, insbesondere im Bereich eines üblichen Ringschraubenschlüssels liegt.Proceeding from this, it is an object of the invention to avoid the disadvantages of the known power wrench according to DE-OS 30 08 381 and to improve the power wrench of the type mentioned at the outset in such a way that the clearance is less, in particular in the area of a conventional ring wrench.

Diese Aufgabe wird ausgehend von dem Kraftschrauber der eingangs genannten Art dadurch gelöst,

  • daß der Reaktionsarm das Spannrad über einen Winkel von maximal 180° umgreift,
  • daß die zwischen dem Kraftarm und dem Reaktionsarm wirksame Führung aus der Nut und dem Vorsprung zwischen der gemeinsamen Achse und dem zweiten Endbereich des Kraftarmes und des Reaktionsarmes angeordnet ist,
  • daß sich die Führung aus der Nut und dem Vorsprung über einen Winkel von maximal 180° erstreckt und
  • daß die Nut und der Vorsprung parallel zu der gemeinsamen Achse gerichtet ineinandergreifen.
Starting from the power wrench of the type mentioned at the outset, this object is achieved by
  • that the reaction arm grips the tensioning wheel over an angle of maximum 180 °,
  • that the effective between the power arm and the reaction arm guide from the groove and the projection between the common axis and the second end region of the power arm and the reaction arm is arranged,
  • that the guide extends from the groove and the projection over an angle of maximum 180 ° and
  • that the groove and the projection engage parallel to the common axis.

Der entscheidende Unterschied gegenüber dem vorbekannten Kraftschrauber nach der DE-OS 30 08 381 liegt darin, daß der Kraftarm nicht mehr in einer Kreisöffnung des Reaktionsarms gelagert ist, die Führung zwischen Kraftarm und Reaktionsarm sich also nicht über 360° erstreckt, sondern diese Führung sich zwischen der Achse und dem zweiten Endbereich der Arme befindet und sich über maximal 180° erstreckt. Dadurch umschließt der Reaktionsarm den Kraftarm nicht mehr (wie bei dem vorbekannten Kraftschrauber), sondern endet oberhalb einer Linie, die quer zur Längsrichtung des Reaktionsarms und durch die Achse verläuft. Das Freimaß des so beschriebenen Kraftschraubers, insbesondere das radiale Freimaß, ist somit nicht mehr durch die Außenmaße des Reaktionsarms, sondern lediglich durch das kreisbogenförmige, freie Ende des Kraftarms bestimmt.The decisive difference compared to the previously known power screwdriver according to DE-OS 30 08 381 is that the power arm is no longer supported in a circular opening of the reaction arm, so the guide between the power arm and reaction arm does not extend over 360 °, but this guide is between the axis and the second end region of the arms and extends over a maximum of 180 °. As a result, the reaction arm no longer surrounds the power arm (as in the previously known power screwdriver), but ends above a line which runs transversely to the longitudinal direction of the reaction arm and through the axis. The clearance of the power wrench described in this way, in particular the radial clearance, is therefore no longer determined by the external dimensions of the reaction arm, but only by the circular, free end of the power arm.

In einer bevorzugten Weiterbildung der Erfindung wird nun vorgeschlagen, den Kraftarm lösbar mit dem Reaktionsarm zu verbinden, so daß der Kraftarm einfach ausgetauscht werden kann. In Abkehr von den bisher bekannten Kraftschraubern wird nicht mehr das Spannrad ausgetauscht, um die Schlüsselweite zu ändern, vielmehr wird die Einheit aus Spannrad und Kraftarm ausgetauscht. Dies hat den entscheidenden Vorteil, daß unabhängig von der Größe des vorzugsweise als Gehäuse ausgebildeten Reaktionsarms das Freimaß am freien Ende des Kraftarms stets des kleinstmögliche bezogen auf eine gewisee Schlüsselweite ist. Anders ausgedrückt wird auf Grund des Austausches des Kraftarms das Freimaß im wesentlichen durch die Größe des Spannrades bestimmt. Insgesamt ergibt sich der Vorteil, daß ein und dasselbe Gehäuse eines Kraftschraubers, in dem zweckmäßigerweise auch der Kraftzylinder untergebracht ist, für unterschiedliche Schlüsselweiten ausgerüstet werden kann und dabei jeweils das kleinstmögliche Freimaß pro Schlüsselweite erreicht wird.In a preferred development of the invention, it is now proposed to releasably connect the power arm to the reaction arm so that the power arm can be easily replaced. In deviation from the previously known power screwdrivers, the tensioning wheel is no longer replaced, In order to change the width across flats, the unit consisting of tensioning wheel and power arm is replaced. This has the decisive advantage that regardless of the size of the reaction arm, which is preferably designed as a housing, the clearance at the free end of the power arm is always the smallest possible based on a certain width across flats. In other words, due to the replacement of the power arm, the free dimension is essentially determined by the size of the tensioning wheel. Overall, there is the advantage that one and the same housing of a power wrench, in which the power cylinder is expediently housed, can be equipped for different wrench sizes and the smallest possible clearance per wrench size is achieved.

Die erfindungsgemäße Ausbildung des Kraftschraubers läßt sich an einem Kraftschrauber nach der DE-OS 30 08 381 verwirklichen, wobei hier vorzugsweise der Kraftzylinder im Reaktionsarm angeordnet wird, um die Baueinheit aus Kraftarm und Spannrad einschließlich Sperrklinke möglichst einfach ausführen zu können. In besonders bevorzugter Weiterbildung wird ein Kraftschrauber nach der DE-OS 34 07 126 (Offenlegungstag 29.08.85) eingesetzt, bei dem ein etwa birnenförmiger Kraftarm vorgesehen ist, der sich mit seinem kleineren Antriebskopf innerhalb der Zylinderbohrung befindet und in eine Ausnehmung des Kolbens greift, wobei die Achslinie der Zylinderbohrung quer zur Längsrichtung des Kraftzylinders verläuft. Bei diesem Kraftschrauber ist der Reaktionsarm als Gehäuse ausgebildet und besteht vorzugsweise aus einem Gehäuseteil sowie seitlich und mit einfachen Mitteln an diesem Gehäuseteil befestigbaren Lagerschalen, in denen die Führung für den Kraftarm ausgebildet ist. Zum Austausch eines Kraftarms müssen lediglich diese Lagerschalen entfernt werden, der Kraftarm kann dann aus dem Gehäuseteil herausgezogen werden. Hierdurch ist ein Austausch der Kraftarme besonders einfach.The inventive design of the power wrench can be realized on a power wrench according to DE-OS 30 08 381, here preferably the power cylinder is arranged in the reaction arm in order to be able to carry out the assembly of power arm and tensioning wheel including pawl as simply as possible. In a particularly preferred development, a power wrench according to DE-OS 34 07 126 (published on August 29, 1985) is used, in which an approximately pear-shaped force arm is provided, which is located within the cylinder bore with its smaller drive head and engages in a recess in the piston, wherein the axis line of the cylinder bore extends transversely to the longitudinal direction of the power cylinder. In this power wrench, the reaction arm is designed as a housing and preferably consists of a housing part and bearing shells that can be fastened laterally and with simple means to this housing part, in which the guide for the power arm is formed. To replace a power arm, only these bearing shells have to be removed, the power arm can then be pulled out of the housing part. This makes replacing the power arms particularly easy.

Weitere Vorteile der Erfindung ergeben sich aus den übrigen Ansprüchen sowie der nun folgenden Beschreibung eines nicht einschränkend zu verstehenden Ausführungsbeispiels, das unter Bezugnahme auf die Zeichnung näher erläutert wird. In dieser zeigen:

  • Fig. 1 einen Schnitt durch einen Kraftschrauber entsprechend der Schnittlinie I-I in Figur 2,
  • Fig. 2 ein Schnittbild entsprechend der Schnittlinie 11-11 in Figur 1 und
  • Fig. 3 eine Draufsicht auf eine Lagerschale.
Further advantages of the invention result from the remaining claims and the following description of a non-restrictive exemplary embodiment, which is explained in more detail with reference to the drawing. In this show:
  • 1 shows a section through a power wrench according to section line II in FIG. 2,
  • Fig. 2 is a sectional view corresponding to the section line 11-11 in Figure 1 and
  • Fig. 3 is a plan view of a bearing shell.

Der in den Figuren gezeigte Kraftschrauber hat einen als Gehäuse ausgebildeten Reaktionsarm 1 und einen Kraftarm 2, die jeweils an ihren ersten, in den Figuren unteren Endbereichen um eine gemeinsame Achse 3 gegeneinander schwenkbar geführt sind. Der Kraftarm 2 hat eine kreisförmige Bohrung 4 an seinem ersten, unteren Endbereich, in dieser ist ein Spannrad 5 um die Achse 3 drehbar gelagert. Es hat einen Innensechskant 6 und an seiner äußeren, weitgehend zylindrischen Mantelfläche eine nach außen vorstehende Verzahnung 7. Mit dieser Verzahnung 7 wirkt eine Sperrklinke 8 zusammen, die in einer Bucht 9 des Kraftarmes 2 angeordnet ist. Schließlich ist im Reaktionsarm ein hydraulischer Kraftzylinder aus einem Zylinder 10 und einem Kolben 11 angeordnet, die Kraftübertragung zwischen diesem Kolben 11 um dev Kraftarm 2 erfolgt entsprechend der Lehre der DE-OS 3407126, deren Offenbarungsgehalt ausdrücklicher Bestandteil der vorliegenden Anmeldung ist.The power screwdriver shown in the figures has a reaction arm 1 designed as a housing and a power arm 2, each of which is guided at its first end regions, which are lower in the figures, about a common axis 3 and can be pivoted relative to one another. The power arm 2 has a circular bore 4 at its first, lower end region, in which a tensioning wheel 5 is rotatably mounted about the axis 3. It has an internal hexagon 6 and on its outer, largely cylindrical lateral surface an outwardly projecting toothing 7. With this toothing 7, a pawl 8 interacts, which is arranged in a bay 9 of the power arm 2. Finally, a hydraulic power cylinder comprising a cylinder 10 and a piston 11 is arranged in the reaction arm, the power transmission between this piston 11 and dev power arm 2 takes place in accordance with the teaching of DE-OS 3407126, the disclosure content of which is an integral part of the present application.

Wie die Figuren zeigen, ist der Reaktionsarm 1 aus drei Teilen leicht demontierbar zusammengesetzt: Zum einen aus einem Gehäuseteil 12, in dem sich der hydraulische Kraftzylinder, die Anschlüsse und weitere Teile befinden, zum anderen aus zwei Lagerschalen 13, 14, die in ihrem oberen Endbereich in eine Ausnehmung 15 des Gehäuseteils 12 bündig und formschlüssig eingepaßt sind. Die Lagerschalen 13, 14 sind über mehrere, leicht zu lösende Schrauben 16 mit dem Gehäuseteil 12 verbunden. Das Gehäuseteil 12 endet bereits in großem Abstand von der Achse 3, im Ausführungsbeispiel auf einer Linie, die parallel zur Arbeitsrichtung des hydraulischen Kraftzylinders und durch die Sperrklinke 8 verläuft, es bestimmt somit nicht das Freimaß des Kraftschraubers.As the figures show, the reaction arm 1 is composed of three parts that can be easily dismantled: on the one hand from a housing part 12, in which the hydraulic power cylinder, the connections and other parts are located, and on the other hand from two bearing shells 13, 14, which are located in their upper part End area are flush and positively fitted into a recess 15 of the housing part 12. The bearing shells 13, 14 are connected to the housing part 12 by means of a plurality of easily detachable screws 16. The housing part 12 already ends at a large distance from the axis 3, in the exemplary embodiment on a line that runs parallel to the working direction of the hydraulic power cylinder and through the pawl 8, it therefore does not determine the clearance of the power wrench.

Die beiden Lagerschalen 13, 14 ragen gegenüber dem Gehäuseteil 12 in Richtung der Achse 3 vor, sie einden jedoch vor einer Linie, die ebenfalls parallel zur Achse 17 des hydraulischen Kraftzylinders verläuft und durch die Achse 3 geht. Die Lagerschalen 13, 14 erstrecken sich daher nicht in einen Halbraum um die Achse 3, der in Figur 1 mit den Pfeilen 18 bezeichnet ist, anders ausgedrückt bestimmen sie nicht das Freimaß, insbesondere radiale Freimaß des Kraftschraubers.The two bearing shells 13, 14 protrude relative to the housing part 12 in the direction of the axis 3, but they are in front of a line which also runs parallel to the axis 17 of the hydraulic power cylinder and passes through the axis 3. The bearing shells 13, 14 therefore do not extend into a half space around the axis 3, which is denoted by the arrows 18 in FIG. 1; in other words, they do not determine the clearance, in particular the radial clearance of the power wrench.

In den Lagerschalen 13, 14 und konzentrisch zur Achse 3 ist ein Vorsprung 19 vorgesehen, der bei montierten Lagerschalen 13, 14 nach innen weist und sich über ca 170° erstreckt. Er dient der Führung des Kraftarms 2 um die Achse 3, hierauf wird im folgenden näher eingegangen.In the bearing shells 13, 14 and concentric to the axis 3, a projection 19 is provided which, when the bearing shells 13, 14 are mounted, points inwards and extends over approximately 170 °. It serves to guide the power arm 2 about the axis 3, which will be discussed in more detail below.

Der Kraftarm besteht aus zwei gleich dicken Halbarmen 20, 21 (siehe Figur 2), in denen jeweils ein Teil der Bucht 9 ausgefräst ist. Bis auf den Verlauf dieser Bucht, der spiegelbildlich ist, sind die beiden Halbarme 20, 21 deckungsgleich. Die . beiden Halbarme 20, 21 sind über geeignete Mittel miteinander verbunden, beispielsweise seitlich Vorsprünge 22, andere Verbindungsmittel und -orte sind möglich.The power arm consists of two half-arms 20, 21 of equal thickness (see FIG. 2), in each of which part of the bay 9 is milled out. Except for the course of this bay, which is a mirror image, the two half arms 20, 21 are congruent. The . Both half arms 20, 21 are connected to one another by suitable means, for example laterally projections 22, other connecting means and locations are possible.

Der aus den beiden Halbarmen 20, 21 zusammengesetzte Kraftarm 2 ist in wesentlichen birnenförmig, der hat einen in den Figuren 1 und 2 obenliegenden Abtriebskopf 23, der sich zumindest teilweise innerhalb des Zylinders 10 befindet und in eine ihm angepaßt Ausnehmung 24 an beiden Seiten des Kolbens 11 (siehe Figur 2) eingefügt ist. Er wird in beiden Bewegungsrichtungen des Kolbens 11 mitgenommen.The force arm 2 composed of the two half arms 20, 21 is essentially pear-shaped, has an output head 23 located in FIGS. 1 and 2, which is located at least partially within the cylinder 10 and in a recess 24 adapted to it on both sides of the piston 11 (see Figure 2) is inserted. It is carried in both directions of movement of the piston 11.

Der Sperrklinke 8 befindet sich vollständig innerhalb des Kraftarms 2, so daß dieser ausgetauscht werden kann, ohne dabei in die Mechanik der Sperrklinke 8 eingreifen zu können. Im Gegensatz zur Figur des DE-OS 3407126 liegt die Sperrklinke 8 in der in Figur 1 gezeigten Eingriffstellung lediglich mit ihrer Fläche 25 an der schräg verlaufenden Einrastflanke 26 an, ohne mit ihrer vorderen Fläche unmittelbar am Rand der Bucht 9 anzuschlagen. Dadurch wird erreicht, daß auch bei Abnutzung der Zähne der Sperrklinke 8 oder der Verzahnung 7 stets eine präzise Eingriffstellung erreicht wird, ohne daß diese Eingriffstellung durch einen ortsfesten Anschlag vorgegeben ist.The pawl 8 is located entirely within the power arm 2, so that it can be replaced without being in the mechanics the pawl 8 can intervene. In contrast to the figure of DE-OS 3407126, the pawl 8 in the engagement position shown in FIG. 1 only rests with its surface 25 against the obliquely extending snap-in flank 26 without striking its front surface directly at the edge of the bay 9. This ensures that even when the teeth of the pawl 8 or the teeth 7 wear, a precise engagement position is always achieved without this engagement position being predetermined by a stationary stop.

Wie Figur 2 zeigt, ist in den beiden Halbarmen 20, 21 des Kraftarms 2 eine kreisbogenförmige, konzentrisch zur Achse 3 verlaufende und sich über etwa 90° erstreckende Führungsnut 27 vorgesehen, in die der Vorsprung 19 paßgenau und weitgehend klapperfrei eingreift, so daß eine Bogenführung gebildet wird. Diese Führung übernimmt die Aufgabe der kreisbogenförmigen Führungsfläche des Reaktionsarms bei dem Kraftschrauber nach der DE-OS 34 07 126. Wie die Figuren zeigen, befindet sich diese Führung zwischen der Achse 3 und den zweiten, in den Figuren oben liegenden Endbereichen der Arme 1, 2, so daß diese Führung sich nicht im durch die Pfeile 18 bezeichneten Halbraum befindet. Die praktische Ausbildung der Führung ist an sich beliebig, die dargestellte Führung aus dem Vorsprung 19 und der Führungsnut 27 ist im wesentlichen als ein günstiges Ausführungsbeispiel zu sehen. Kinematische Umkehr ist möglich, weiterhin sind beliebige andere Führungen möglich, solange sich diese außerhalb des unteren Halbraums (Pfeile 18) befinden und beidseitig den Durchtritt durch den Sechskant 6 nicht beeinträchtigen. Dieserfreie Druchtritt durch den Sechskant 6 ist ein für den praktischen Einsatz des Kraftschraubers vorteilhaftes Merkmal und bereits bei den vorbekannten Kraftschraubern verwirklicht.As Figure 2 shows, in the two half arms 20, 21 of the power arm 2, a circular arc, concentric to the axis 3 and extending over about 90 ° extending guide groove 27 is provided, in which the projection 19 engages with a precise fit and largely rattle-free, so that an arc guide is formed. This guide takes over the task of the circular-shaped guide surface of the reaction arm in the power wrench according to DE-OS 34 07 126. As the figures show, this guide is located between the axis 3 and the second end regions of the arms 1, 2 located at the top in the figures , so that this guide is not in the half-space indicated by the arrows 18. The practical design of the guide is arbitrary in itself, the guide shown from the projection 19 and the guide groove 27 can be seen essentially as a favorable embodiment. Kinematic reversal is possible, furthermore any other guides are possible as long as they are outside the lower half space (arrows 18) and do not impair the passage through the hexagon 6 on both sides. This free passage through the hexagon 6 is a feature which is advantageous for the practical use of the power screwdriver and has already been implemented in the previously known power screwdrivers.

Der in den Figuren gezeigte Kraftschrauber ist mit einem Spannrad 5 mit dem größtmöglichen Innensechskant ausgerüstet. Will man den Kraftschrauber für Schrauben oder Muttern kleinerer Schlüsselweite verwenden, so wird nicht das Spannrad 5 ausgetauscht, sonderen die komplette, etwa birnenförmige und allseitig geschlossene Einheit aus den beiden den Kraftarm 2 bildenden Halbarmen 20, 21 dem Spannrad 5 und der Sperrklinke 8 samt Zubehör, wie beispielsweise innenliegender Sperrklinkenfeder. Zum Austausch dieser Einheit gegen eine andere genügt es, die beiden Lagerschalen 13, 14 vom Gehäuseteil 12 abzuschrauben, der in seinem zweiten (oberen) Endbereich gabelförmige Kraftarm 2 kann dann in die nach unten offene Ausnehmung 24 über den Antriebskopf 23 eingeschoben werden. Der Verlauf der Führungsnuten 27 an den beiden Halbarmen 20,21 des Kraftarms 2 bleibt bestehen und ist unabhängig von der jeweils benutzten Einheit, die einzelnen Einheiten unterscheiden sich durch die Größe des Innensechskantes 6 und-entscheidend für das Freimaß-den Außenradius der teilzylindrischen Fläche 28 am ersten Endbereich des Kraftarms 2.The power wrench shown in the figures is equipped with a tensioning wheel 5 with the largest possible hexagon socket. If you want to use the power wrench for screws or nuts with a smaller wrench size, the tensioning wheel 5 is not replaced, but the complete, approximately pear-shaped and all-round closed unit consisting of the two arms 20, 21 forming the power arm 2, the tensioning wheel 5 and the pawl 8 together with accessories , such as an internal pawl spring. To replace this unit with another, it is sufficient to unscrew the two bearing shells 13, 14 from the housing part 12, the fork-shaped force arm 2 in its second (upper) end region can then be inserted into the downwardly open recess 24 via the drive head 23. The course of the guide grooves 27 on the two half arms 20, 21 of the power arm 2 remains and is independent of the unit used in each case, the individual units differ by the size of the hexagon socket 6 and — crucially for the clearance — the outer radius of the partially cylindrical surface 28 at the first end area of the power arm 2.

Am in Figur 1 linksseitigen Teil des Gehäuseteils 12 kann lösbar eine Spindelhalterung mit verstellbarerSpindel angesetzt werden, die Spindel befindet sich dabei oberhalb oder unterhalb der Ebenen der Lagerschalen 13, 14. Sie wird so eingestellt, daß sie mit ihrem vorderen Ende anschlägt und bildet das Widerlager für den Reakationsarm 1.A spindle holder with an adjustable spindle can be detachably attached to the left-hand part of the housing part 12 in FIG. 1, the spindle being located above or below the levels of the bearing shells 13, 14. It is adjusted so that it strikes with its front end and forms the abutment for the reaction arm 1.

Claims (8)

1. Power wrench, comprising
-a power arm (2) and a reaction arm (1) each at one of their end portions being guided swivably relative to each other about a common axis (3) through engagement of a circle arc shaped ledge (19) provided on the one arm into a coaxial circle arc shaped groove (27) in the other arm,
-a tensioning wheel (5) and a latch (8), said tensioning wheel being supported rotatably about the axis (3) in a bore (4) in the first end portion of the power arm (2) and comprising a toothing (7) and said latch being disposed on the power arm and cooperating with the tensioning wheel in the one swivelling direction of the power arm engaging the teeth of the tensioning wheel and in the other swivelling direction of the power arm sliding over the teeth of the tensioning wheel and
-a hydraulic drive engaging between the power arm and the reaction arm near the other end portions thereof and comprising a cylinder (10) and a piston (11) slidable therein, characterised in
that the reaction arm (1) encircles the tensioning wheel (5) over an angle of maximally 180°,
that the guidance consisting of the groove (27) and the ledge (19) and being effective between the power arm (2) and the reaction arm (1) is disposed between the common axis (3) and the second end portions of the power arm and of the reaction arm,
that the guidance consisting of the groove (27) and the ledge (19) extends over an angle of maximally 180° and
that the groove (27) and the ledge (19) engage into each other directed parallel to the common axis (3).
2. Power wrench according to claim 1, characterised in that the reaction arm (1) is easily releasably composed of a housing member (12) receiving the hydraulic power drive (10,12) and of two supporting shells (13, 14), the supporting shells (13, 14) being connected with the housing member (12) in an easily releasable manner and each comprising a guiding groove (27) of a ledge (19).
3. Power wrench according to claim 2, characterised in that the power arm (2) is united with the tensioning wheel (5) and the latch (8) to a unit easily replaceable and releasably connectable with the reaction arm (1), units being provided comprising tensioning wheels having interior hexagons (6) of different dimensions.
4. Power wrench according to one of the claims 1 to 3, characterised in that the power arm (2) is composed of two half-arms (20, 21) which are congruent except of the bight (9).
5. Power wrench according to one of the claims 1 to 4, characte.rised in that the power arm (2) is formed essentially pear-shaped and at its second end portion having fork shape.
6. Power wrench according to one of the claims 2 to 5, characterised in that the housing member (12) on both sides each comprises one groove (15) for one supporting shell (13, 14).
7. Power wrench according to one of the claims 2 to 6, characterised in that the housing member (12) is not extending up to the outer periphery of the tensioning wheel (5).
8. Power wrench according to one of the claims 1 to 7, characterised in that the second end portion of the power arm (2) being formed as a driving head (23) has its center moving substantially on the axis line (17) of the cylinder (10).
EP85101942A 1984-06-01 1985-02-22 Power-driven wrench with an action arm and a reaction arm, preferably constructed as a housing Expired - Lifetime EP0163009B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843420446 DE3420446A1 (en) 1984-06-01 1984-06-01 POWER SCREWDRIVER WITH A POWER ARM AND PREFERRED REAR ARM
DE3420446 1984-06-01

Publications (3)

Publication Number Publication Date
EP0163009A2 EP0163009A2 (en) 1985-12-04
EP0163009A3 EP0163009A3 (en) 1987-05-06
EP0163009B1 true EP0163009B1 (en) 1990-09-05

Family

ID=6237380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101942A Expired - Lifetime EP0163009B1 (en) 1984-06-01 1985-02-22 Power-driven wrench with an action arm and a reaction arm, preferably constructed as a housing

Country Status (5)

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US (1) US4765210A (en)
EP (1) EP0163009B1 (en)
JP (1) JPS6156875A (en)
DE (2) DE3420446A1 (en)
ES (1) ES296614Y (en)

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GB8525983D0 (en) * 1985-10-22 1985-11-27 Hydra Tight Ltd Power tools
DE3611284A1 (en) * 1986-04-04 1987-10-22 Applied Power Inc POWER SCREWDRIVER
GB8902659D0 (en) * 1989-02-07 1989-03-30 Hedley Purvis Ltd Improved hydraulic torque wrench
JPH02232177A (en) * 1989-03-07 1990-09-14 John K Junkers Hydraulically operated wrench
DE4210512C2 (en) * 1992-03-31 1994-04-28 Wagner Paul Heinz Hydraulic power wrench
US6237446B1 (en) 1999-10-26 2001-05-29 Genlyte Thomas Group Llc Wrench adapter assembly
US6330842B1 (en) * 2000-06-26 2001-12-18 Kevin Brun Compact head power driven ratchet tool
US20050051002A1 (en) * 2003-09-05 2005-03-10 Kevin Brun Sealed powered ratchet wrench
SE528112C2 (en) 2004-10-01 2006-09-05 Atlas Copco Tools Ab Screwdriver mounting device
SE529853C2 (en) * 2006-03-30 2007-12-11 Atlas Copco Tools Ab Mounting device for attaching an element to a tubular member
US8499853B2 (en) * 2009-11-16 2013-08-06 Norwolf Tool Works, Inc. Apparatus and methods for controlling hydraulically powered equipment
US8789445B1 (en) 2012-05-04 2014-07-29 Charles Burridge Hawley, III Air powered nut runner
US9550282B2 (en) * 2014-04-22 2017-01-24 John D. Davis Compact hydraulic torque wrench cartridge
GB2558536A (en) * 2016-11-14 2018-07-18 Torque Tension Systems Ltd A hydraulic torque wrench

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US3097551A (en) * 1963-07-16 schmitt
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US4440046A (en) * 1980-03-05 1984-04-03 Paul-Heinz Wagner Power wrench
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DE3407126A1 (en) * 1984-02-28 1985-08-29 Enerpac GmbH, 4300 Essen POWER SCREWDRIVER WITH A TENSION WHEEL WITH A FINE-STAGE TOOTHING

Also Published As

Publication number Publication date
JPS6156875A (en) 1986-03-22
EP0163009A2 (en) 1985-12-04
DE3420446A1 (en) 1985-12-05
US4765210A (en) 1988-08-23
EP0163009A3 (en) 1987-05-06
DE3579494D1 (en) 1990-10-11
ES296614Y (en) 1989-06-01
ES296614U (en) 1988-11-16

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