EP0508316B1 - Power-driven wrench - Google Patents

Power-driven wrench Download PDF

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Publication number
EP0508316B1
EP0508316B1 EP92105760A EP92105760A EP0508316B1 EP 0508316 B1 EP0508316 B1 EP 0508316B1 EP 92105760 A EP92105760 A EP 92105760A EP 92105760 A EP92105760 A EP 92105760A EP 0508316 B1 EP0508316 B1 EP 0508316B1
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EP
European Patent Office
Prior art keywords
piston
cylinder
housing
power wrench
bushing
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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
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EP92105760A
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German (de)
French (fr)
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EP0508316A1 (en
Inventor
Karl Beuke
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Wagner Paul-Heinz
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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 invention relates to a pressure-operated power screwdriver for turning screws, nuts and the like.
  • a power screwdriver which has a rotatable ring part in a housing which can be connected to the screw head to be rotated in a rotationally fixed manner.
  • the ring part is rotated in sections by a ratchet lever, which is driven back and forth by a piston.
  • the piston is movable in a cylinder.
  • the piston rod is connected to the piston via a joint located inside the piston and its other end is connected to the ratchet lever via a joint. This oscillating attachment of the piston rod enables the piston rod to adapt to the different pivoting positions of the ratchet lever with respect to the axis of the ring part.
  • the piston has a cylindrical peripheral surface with two sealing rings used in sealing grooves so that the piston axis always coincides with the cylinder axis.
  • a disadvantage of this construction is that the articulated attachment of the piston rod to the piston requires considerable effort and that several components are required for this, which must be manufactured individually and then assembled. The individual parts, such as the joint ball, the ball socket and the ball clamping ring, are difficult to manufacture with the required high accuracy.
  • a power wrench according to the preamble of claim 1 is known from EP-A-0 276 936.
  • This power wrench has a piston with a convex peripheral surface, which is firmly connected to a piston rod.
  • the piston rod passes through an end wall of the cylinder, the passage being sealed by a seal.
  • At the end of the piston rod there is a cross bolt which carries two sliding shoes which protrude into a fork of the driving part and are guided in slots in the housing in such a way that the piston rod can remain essentially in axial alignment and nevertheless remains in engagement with the rotatably mounted driving lever . Slight pivoting movements of the piston rod are only permitted because the piston rod and other parts of the device can deform.
  • a power wrench known from DE-C-36 20 753 has a cylindrical piston which is guided in the cylinder with axial alignment. The piston is reset by a spring supported on the cylinder and acting against the piston.
  • the invention has for its object to provide a power wrench that consists of a few individual parts, is easy to manufacture and can be manufactured with small dimensions.
  • the piston which lies sealingly against the cylinder wall, has a convex peripheral surface, which is preferably spherical. This allows the piston to be tilted while maintaining its seal on the cylinder wall so that the piston axis can have different orientations with respect to the cylinder axis.
  • the piston rod is rigidly attached to the piston.
  • the other end of the piston rod is connected to the driving lever via a swivel joint.
  • the swivel joint moves in a circle around the axis of rotation of the driving lever and its position determines not only the orientation of the piston rod but also the orientation of the piston firmly connected to it.
  • a major advantage is that the piston can be manufactured together with the piston rod as a one-piece part, so that the manufacturing and assembly effort of the entire power wrench is significantly reduced.
  • the axial length of the piston can also be reduced, whereby the dimensions of the housing in the axial direction of the cylinder are kept small.
  • the cylinder is preferably formed by an interchangeable cylinder sleeve inserted into the housing.
  • This cylinder liner is expediently inserted in a corresponding bore in the housing.
  • the exchangeable cylinder liner has the advantage that if the cylinder surface is damaged by foreign objects that have penetrated, only the cylinder liner has to be replaced. Another advantage is that the cylinder liner withstands the working pressure and that the housing forms an additional burst protection, which is effective if the cylinder liner breaks. As a result of the play-free adaptation of the cylinder liner to the housing, the cylinder liner is held rigidly.
  • the cylinder liner is preferably supported by a support liner.
  • This support bushing can also support a spring driving the piston into the retracted position.
  • the power wrench has a one-piece housing 10 made of steel, which consists of a head piece 11 and a drive piece 12.
  • the head piece 11 has a working space 13 which is delimited by two parallel plate-shaped walls.
  • the ring part 14 is rotatably mounted in these walls.
  • the ring part 14 is a tubular part that has a through channel 15 with a profile toothing 16.
  • the shaft of a socket can be inserted from one or the other side, which is placed on the screw head to be rotated.
  • This shaft has an external toothing corresponding to the profile toothing 16, so that the screw head is connected to the ring part 14 in a rotationally fixed manner.
  • the driving lever 17 On the ring part 14, the driving lever 17 is mounted, which has a spring-loaded ratchet element 18, which can come into engagement with a locking toothing 19 of the ring part 14.
  • the ratchet element 18 is arranged and supported on the driving lever 17 in such a way that the driving lever 17 only takes the ring part 14 in one direction of rotation, but can be moved back in the other direction of rotation without driving the ring part in rotation.
  • a cylinder sleeve 20 in a bore, the bore of which forms the cylinder 21.
  • the cylinder liner 20 has a closed bottom 22 at the end facing away from the driving lever 17 and it has an outwardly projecting annular flange 23 at the opposite end, which is supported on an inner annular shoulder 24 of the housing.
  • the cylinder bushing 20 is pressed against the annular shoulder 24 by a support bushing 25 which is inserted into the working part 12 from the working space 13 and is thereby fixed in the axial direction.
  • the support bushing 25 is screwed into an internal thread of the housing with an external thread 26.
  • the stepped bore 27 into which the cylinder bushing 20 and the support bushing 25 are inserted is open at the outer end of the drive part 12 of the housing and closed there with a screwed-on cover 28.
  • a screw 29 screwed through the cover into the cylinder base 22 serves as a rotation lock for the cylinder liner.
  • An annular groove 30 is provided in the bore 27 and seals 31 and 32 are arranged in sealing grooves on both sides of this annular groove.
  • the annular groove 30 is connected to a pressure channel 33 which extends through the housing and leads to a pressure connection 34 of the housing 10.
  • a bore 35 leads from the annular groove 30 through the wall of the cylinder sleeve 22 into the bottom region of the cylinder 21.
  • the piston 36 In the cylinder 21 there is the piston 36, on which the piston rod 37 is rigidly attached.
  • the peripheral surface 38 of the piston is convex.
  • this peripheral surface 38 has a spherical shape, ie it is spherically curved around the center of the piston.
  • a sealing groove with a sealing ring 39 is provided in the equator of the peripheral surface 38.
  • the sealing ring 39 is supported by a radially resilient support ring 40 which is arranged in the interior of the groove.
  • the sealing ring 39 has a rectangular cross section and it lies with its outer surface flat against the cylinder wall, while its end faces lie against the flanks of the sealing groove of the piston.
  • the end of the piston rod 37 facing away from the piston is connected to the driving lever 17 via a joint with a joint axis 42.
  • the hinge axis 42 moves when the driving lever 17 is pivoted about the axis of the ring part 14.
  • the axis of the cylinder 21 extends at right angles to the axis of the ring part 14. If the piston 36 is moved axially in the cylinder 21, the driving lever 17 is thereby pivoted.
  • the piston rod 37 changes its orientation with respect to the axis of the cylinder 21, whereby the piston 36 is tilted in the manner shown. Despite this tilt position, the seal between the piston and the wall of the cylinder 21 is maintained.
  • the piston 36 is propelled in the cylinder 21 by hydraulic pressure which is supplied to the connection 34.
  • the driving lever 17 is pivoted and the ratchet element 18 takes the ring piece 14 with it.
  • the piston movement is limited in that the piston 36 abuts against the end stop 46 of the support bush 25.
  • the piston 36 is moved back by a spring 43 which is supported on an inner flange 44 of the support bushing 25 and surrounds the piston rod 37.
  • the other end of the spring 43 abuts the front piston surface.
  • the support bushing 25 provides the space inside for receiving the compressed spring.
  • the working space 13 of the housing 10 is closed by a cover 45. With the cover removed, the components of the power wrench can be mounted inside the housing through the corresponding opening, including those components which are accommodated in the drive part 12.
  • the piston rod 37 When the spring 43 presses the piston 36 into the retracted position, the piston rod 37 also takes the driving lever 17 with it via the hinge axis 42, but because of the ratchet there is no driving of the ring part 14 with the driving lever.

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

Description

Die Erfindung betrifft einen druckmittelbetriebenen Kraftschrauber zum Drehen von Schrauben, Muttern u.dgl.The invention relates to a pressure-operated power screwdriver for turning screws, nuts and the like.

Aus DE 29 16 497 C2 ist ein Kraftschrauber bekannt, der in einem Gehäuse ein drehbares Ringteil aufweist, das drehfest mit dem zu drehenden Schraubenkopf verbunden werden kann. Das Ringteil wird abschnittsweise von einem Ratschenhebel gedreht, welcher hin- und hergehend von einem Kolben angetrieben wird. Der Kolben ist in einem Zylinder bewegbar. Die Kolbenstange ist mit dem Kolben über ein im Kolbeninnern befindliches Gelenk verbunden und ihr anderes Ende ist über ein Gelenk mit dem Ratschenhebel verbunden. Durch diese pendelnde Anbringung der Kolbenstange kann die Kolbenstange sich den unterschiedlichen Schwenkstellungen des Ratschenhebels in Bezug auf die Achse des Ringteils anpassen. Der Kolben hat eine zylindrische Umfangsfläche mit zwei in Dichtnuten eingesetzten Dichtringen, so daß die Kolbenachse stets mit der Zylinderachse zusammenfällt. Ein Nachteil dieser Konstruktion besteht darin, daß die gelenkige Anbringung der Kolbenstange am Kolben einen erheblichen Aufwand erfordert und daß hierzu mehrere Komponenten erforderlich sind, die einzeln gefertigt und dann zusammengesetzt werden müssen. Die Einzelteile, wie die Gelenkkugel, die Kugelpfanne und der Kugelspannring, sind fertigungstechnisch schwierig mit der erforderlichen hohen Genauigkeit herzustellen.From DE 29 16 497 C2 a power screwdriver is known which has a rotatable ring part in a housing which can be connected to the screw head to be rotated in a rotationally fixed manner. The ring part is rotated in sections by a ratchet lever, which is driven back and forth by a piston. The piston is movable in a cylinder. The piston rod is connected to the piston via a joint located inside the piston and its other end is connected to the ratchet lever via a joint. This oscillating attachment of the piston rod enables the piston rod to adapt to the different pivoting positions of the ratchet lever with respect to the axis of the ring part. The piston has a cylindrical peripheral surface with two sealing rings used in sealing grooves so that the piston axis always coincides with the cylinder axis. A disadvantage of this construction is that the articulated attachment of the piston rod to the piston requires considerable effort and that several components are required for this, which must be manufactured individually and then assembled. The individual parts, such as the joint ball, the ball socket and the ball clamping ring, are difficult to manufacture with the required high accuracy.

Ein Kraftschrauber nach dem Oberbegriff des Patentanspruchs 1 ist bekannt aus EP-A-0 276 936. Dieser Kraftschrauber weist einen Kolben mit konvexer Umfangsfläche auf, der mit einer Kolbenstange fest verbunden ist. Die Kolbenstange führt durch eine Stirnwand des Zylinders hindurch, wobei der Durchgang durch eine Dichtung abgedichtet ist. Am Ende der Kolbenstange befindet sich ein Querbolzen, der zwei Gleitschuhe trägt, die in eine Gabel des Mitnahmeteils hineinragen und in Schlitzen des Gehäuses derart geführt sind, daß die Kolbenstange im wesentlichen in axialer Ausrichtung verbleiben kann und dennoch mit dem drehbar gelagerten Mitnahmehebel in Eingriff bleibt. Geringe Schwenkbewegungen der Kolbenstange werden nur deshalb zugelassen, weil sich die Kolbenstange und andere Teile der Vorrichtung verformen können.A power wrench according to the preamble of claim 1 is known from EP-A-0 276 936. This power wrench has a piston with a convex peripheral surface, which is firmly connected to a piston rod. The piston rod passes through an end wall of the cylinder, the passage being sealed by a seal. At the end of the piston rod there is a cross bolt which carries two sliding shoes which protrude into a fork of the driving part and are guided in slots in the housing in such a way that the piston rod can remain essentially in axial alignment and nevertheless remains in engagement with the rotatably mounted driving lever . Slight pivoting movements of the piston rod are only permitted because the piston rod and other parts of the device can deform.

Ein aus DE-C-36 20 753 bekannter Kraftschrauber hat einen zylindrischen Kolben, der in dem Zylinder unter axialer Ausrichtung geführt ist. Die Rückstellung des Kolbens erfolgt durch eine am Zylinder abgestützte und gegen den Kolben wirkende Feder.A power wrench known from DE-C-36 20 753 has a cylindrical piston which is guided in the cylinder with axial alignment. The piston is reset by a spring supported on the cylinder and acting against the piston.

Der Erfindung liegt die Aufgabe zugrunde, einen Kraftschrauber zu schaffen, der aus wenigen Einzelteilen besteht, einfach zu fertigen ist und mit kleinformatigen Abmessungen hergestellt werden kann.The invention has for its object to provide a power wrench that consists of a few individual parts, is easy to manufacture and can be manufactured with small dimensions.

Die Lösung dieser Aufgabe erfolgt erfindungsgemäß mit den im Patentanspruch 1 angegebenen Merkmalen.This object is achieved according to the invention with the features specified in claim 1.

Bei dem erfindungsgemäßen Kraftschrauber hat der Kolben, der abdichtend an der Zylinderwand anliegt, eine konvexe Umfangsfläche, die vorzugsweise ballig ausgebildet ist. Dadurch kann der Kolben unter Aufrechterhaltung seiner Abdichtung an der Zylinderwand gekippt werden, so daß die Kolbenachse unterschiedliche Ausrichtungen in bezug auf die Zylinderachse haben kann. An dem Kolben ist die Kolbenstange starr befestigt. Das andere Ende der Kolbenstange ist über ein Drehgelenk mit dem Mitnahmehebel verbunden. Das Drehgelenk bewegt sich auf einem Kreis um die Drehachse des Mitnahmehebels herum und seine Position bestimmt nicht nur die Ausrichtung der Kolbenstange sondern auch die Ausrichtung des damit fest verbundenen Kolbens.In the power wrench according to the invention, the piston, which lies sealingly against the cylinder wall, has a convex peripheral surface, which is preferably spherical. This allows the piston to be tilted while maintaining its seal on the cylinder wall so that the piston axis can have different orientations with respect to the cylinder axis. The piston rod is rigidly attached to the piston. The other end of the piston rod is connected to the driving lever via a swivel joint. The swivel joint moves in a circle around the axis of rotation of the driving lever and its position determines not only the orientation of the piston rod but also the orientation of the piston firmly connected to it.

Ein wesentlicher Vorteil besteht darin, daß der Kolben zusammen mit der Kolbenstange als einstückiges Teil gefertigt werden kann, so daß der Fertigungs- und Montageaufwand des gesamten Kraftschraubers wesentlich verringert wird. Darüberhinaus kann die axiale Länge des Kolbens ebenfalls verringert werden, wodurch die Abmessungen des Gehäuses in axialer Richtung des Zylinders kleingehalten werden.A major advantage is that the piston can be manufactured together with the piston rod as a one-piece part, so that the manufacturing and assembly effort of the entire power wrench is significantly reduced. In addition, the axial length of the piston can also be reduced, whereby the dimensions of the housing in the axial direction of the cylinder are kept small.

Vorzugsweise ist der Zylinder von einer in das Gehäuse eingesetzten auswechselbaren Zylinderbuchse gebildet. Diese Zylinderbuchse ist zweckmäßigerweise in eine entsprechende Bohrung des Gehäuses passend eingesetzt. Die auswechselbare Zylinderbuchse bietet den Vorteil, daß bei Beschädigungen der Zylinderfläche durch eingedrungene Fremdkörper lediglich die Zylinderbuchse ausgewechselt werden muß. Ein weiterer Vorteil besteht darin, daß die Zylinderbuchse dem Arbeitsdruck standhält und daß das Gehäuse einen zusätzlichen Berstschutz bildet, der bei einem Bruch der Zylinderbuchse wirksam ist. Infolge der spielfreien Anpassung der Zylinderbuchse an das Gehäuse wird die Zylinderbuchse biegesteif festgehalten.The cylinder is preferably formed by an interchangeable cylinder sleeve inserted into the housing. This cylinder liner is expediently inserted in a corresponding bore in the housing. The exchangeable cylinder liner has the advantage that if the cylinder surface is damaged by foreign objects that have penetrated, only the cylinder liner has to be replaced. Another advantage is that the cylinder liner withstands the working pressure and that the housing forms an additional burst protection, which is effective if the cylinder liner breaks. As a result of the play-free adaptation of the cylinder liner to the housing, the cylinder liner is held rigidly.

Die Zylinderbuchse wird vorzugsweise von einer Stützbuchse abgestützt. Diese Stützbuchse kann zugleich auch eine den Kolben in die Rückzugsstellung treibende Feder abstützen.The cylinder liner is preferably supported by a support liner. This support bushing can also support a spring driving the piston into the retracted position.

Im folgenden wird unter Bezugnahme auf die einzige Figur der Zeichnung ein Ausführungsbeispiel der Erfindung näher erläutert.In the following an embodiment of the invention will be explained with reference to the single figure of the drawing.

In der Zeichnung ist schematisch ein Längsschnitt durch den Kraftschrauber dargestellt.In the drawing, a longitudinal section through the power wrench is shown schematically.

Der Kraftschrauber weist ein einteiliges Gehäuse 10 aus Stahl auf, welches aus einem Kopfstück 11 und einem Antriebsstück 12 besteht. Das Kopfstück 11 hat einen Arbeitsraum 13, der durch zwei parallele plattenförmige Wände begrenzt ist. In diesen Wänden ist das Ringteil 14 drehbar gelagert. Das Ringteil 14 ist ein rohrförmiges Teil, das einen Durchgangskanal 15 mit einer Profilverzahnung 16 aufweist. In den Durchgangskanal 15 kann von der einen oder von der anderen Seite her der Schaft einer Stecknuß eingeschoben werden, die auf den zu drehenden Schraubenkopf aufgesetzt wird. Dieser Schaft weist eine der Profilverzahnung 16 entsprechende Außenverzahnung auf, so daß der Schraubenkopf drehfest mit dem Ringteil 14 verbunden wird.The power wrench has a one-piece housing 10 made of steel, which consists of a head piece 11 and a drive piece 12. The head piece 11 has a working space 13 which is delimited by two parallel plate-shaped walls. The ring part 14 is rotatably mounted in these walls. The ring part 14 is a tubular part that has a through channel 15 with a profile toothing 16. In the through-channel 15, the shaft of a socket can be inserted from one or the other side, which is placed on the screw head to be rotated. This shaft has an external toothing corresponding to the profile toothing 16, so that the screw head is connected to the ring part 14 in a rotationally fixed manner.

Auf dem Ringteil 14 ist der Mitnahmehebel 17 gelagert, der ein federgespanntes Ratschenelement 18 aufweist, welches mit einer Rastverzahnung 19 des Ringteils 14 in Eingriff kommen kann. Das Ratschenelement 18 ist in der Weise angeordnet und am Mitnahmehebel 17 abgestützt, daß der Mitnahmehebel 17 das Ringteil 14 immer nur in einer Drehrichtung mitnimmt, in der anderen Drehrichtung jedoch ohne Drehmitnahme des Ringteils zurückbewegt werden kann.On the ring part 14, the driving lever 17 is mounted, which has a spring-loaded ratchet element 18, which can come into engagement with a locking toothing 19 of the ring part 14. The ratchet element 18 is arranged and supported on the driving lever 17 in such a way that the driving lever 17 only takes the ring part 14 in one direction of rotation, but can be moved back in the other direction of rotation without driving the ring part in rotation.

Im Antriebsteil 12 des Gehäuses 10 befindet sich in einer Bohrung eine Zylinderbuchse 20, deren Bohrung den Zylinder 21 bildet. Die Zylinderbuchse 20 weist an dem dem Mitnahmehebel 17 abgewandten Ende einen geschlossenen Boden 22 auf und sie hat am entgegengesetzten Ende einen nach außen abstehenden Ringflansch 23, der an einer inneren Ringschulter 24 des Gehäuses abgestützt ist.In the drive part 12 of the housing 10 there is a cylinder sleeve 20 in a bore, the bore of which forms the cylinder 21. The cylinder liner 20 has a closed bottom 22 at the end facing away from the driving lever 17 and it has an outwardly projecting annular flange 23 at the opposite end, which is supported on an inner annular shoulder 24 of the housing.

Die Zylinderbuchse 20 wird von einer Stützbuchse 25, welche vom Arbeitsraum 13 her in das Arbeitsteil 12 eingesetzt ist, gegen die Ringschulter 24 gedrückt und dadurch in axialer Richtung fixiert. Die Stützbuchse 25 ist mit einem Außengewinde 26 in ein Innengewinde des Gehäuses eingeschraubt.The cylinder bushing 20 is pressed against the annular shoulder 24 by a support bushing 25 which is inserted into the working part 12 from the working space 13 and is thereby fixed in the axial direction. The support bushing 25 is screwed into an internal thread of the housing with an external thread 26.

Die abgestufte Bohrung 27, in die die Zylinderbuchse 20 und die Stützbuchse 25 eingesetzt sind, ist am äußeren Ende des Antriebsteils 12 des Gehäuses offen und dort mit einem angeschraubten Deckel 28 verschlossen. Eine durch den Deckel hindurch in den Zylinderboden 22 eingeschraubte Schraube 29 dient als Drehsicherung für die Zylinderbuchse.The stepped bore 27 into which the cylinder bushing 20 and the support bushing 25 are inserted is open at the outer end of the drive part 12 of the housing and closed there with a screwed-on cover 28. A screw 29 screwed through the cover into the cylinder base 22 serves as a rotation lock for the cylinder liner.

In der Bohrung 27 ist eine Ringnut 30 vorgesehen und zu beiden Seiten dieser Ringnut sind Dichtungen 31 und 32 in Dichtnuten angeordnet. Die Ringnut 30 steht mit einem durch das Gehäuse hindurchführenden Druckkanal 33 in Verbindung, der zu einem Druckanschluß 34 des Gehäuses 10 führt. Von der Ringnut 30 führt durch die Wand der Zylinderbuchse 22 eine Bohrung 35 in den Bodenbereich des Zylinders 21.An annular groove 30 is provided in the bore 27 and seals 31 and 32 are arranged in sealing grooves on both sides of this annular groove. The annular groove 30 is connected to a pressure channel 33 which extends through the housing and leads to a pressure connection 34 of the housing 10. A bore 35 leads from the annular groove 30 through the wall of the cylinder sleeve 22 into the bottom region of the cylinder 21.

Im Zylinder 21 befindet sich der Kolben 36, an dem die Kolbenstange 37 starr angebracht ist. Die Umfangsfläche 38 des Kolbens ist konvex ausgebildet. Im einzelnen hat diese Umfangsfläche 38 eine ballige Form, d.h. sie ist um den Kolbenmittelpunkt herum sphärisch gekrümmt. Im Äquator der Umfangsfläche 38 ist eine Dichtnut mit einem Dichtring 39 vorgesehen. Der Dichtring 39 wird von einem radial federnden Stützring 40 abgestützt, der im Nutinnern angeordnet ist. Der Dichtring 39 hat rechteckigen Querschnitt und er liegt mit seiner Außenfläche plan an der Zylinderwand an, während seine Stirnflächen an den Flanken der Dichtnut des Kolbens anliegen.In the cylinder 21 there is the piston 36, on which the piston rod 37 is rigidly attached. The peripheral surface 38 of the piston is convex. In particular, this peripheral surface 38 has a spherical shape, ie it is spherically curved around the center of the piston. A sealing groove with a sealing ring 39 is provided in the equator of the peripheral surface 38. The sealing ring 39 is supported by a radially resilient support ring 40 which is arranged in the interior of the groove. The sealing ring 39 has a rectangular cross section and it lies with its outer surface flat against the cylinder wall, while its end faces lie against the flanks of the sealing groove of the piston.

Das dem Kolben abgewandte Ende der Kolbenstange 37 ist über ein Gelenk mit einer Gelenkachse 42 mit dem Mitnahmehebel 17 verbunden. Die Gelenkachse 42 bewegt sich bei einer Verschwenkung des Mitnahmehebels 17 um die Achse des Ringteils 14 herum. Die Achse des Zylinders 21 verläuft rechtwinklig zur Achse des Ringteils 14. Wird der Kolben 36 in dem Zylinder 21 axial bewegt, so wird hierdurch der Mitnahmehebel 17 verschwenkt. Die Kolbenstange 37 ändert ihre Ausrichtung in Bezug auf die Achse des Zylinders 21, wodurch der Kolben 36 in der dargestellten Weise gekippt wird. Trotz dieser Kippstellung wird die Abdichtung zwischen dem Kolben und der Wand des Zylinders 21 beibehalten.The end of the piston rod 37 facing away from the piston is connected to the driving lever 17 via a joint with a joint axis 42. The hinge axis 42 moves when the driving lever 17 is pivoted about the axis of the ring part 14. The axis of the cylinder 21 extends at right angles to the axis of the ring part 14. If the piston 36 is moved axially in the cylinder 21, the driving lever 17 is thereby pivoted. The piston rod 37 changes its orientation with respect to the axis of the cylinder 21, whereby the piston 36 is tilted in the manner shown. Despite this tilt position, the seal between the piston and the wall of the cylinder 21 is maintained.

Durch hydraulischen Druck, der dem Anschluß 34 zugeführt wird, wird der Kolben 36 in dem Zylinder 21 vorgetrieben. Dadurch wird der Mitnahmehebel 17 verschwenkt und das Ratschenelement 18 nimmt das Ringstück 14 mit. Die Kolbenbewegung wird dadurch begrenzt, daß der Kolben 36 gegen den stirnseitigen Anschlag 46 der Stützbuchse 25 stößt.The piston 36 is propelled in the cylinder 21 by hydraulic pressure which is supplied to the connection 34. As a result, the driving lever 17 is pivoted and the ratchet element 18 takes the ring piece 14 with it. The piston movement is limited in that the piston 36 abuts against the end stop 46 of the support bush 25.

Die Rückbewegung des Kolbens 36 erfolgt durch eine Feder 43, die an einem Innenflansch 44 der Stützbuchse 25 abgestützt ist und die Kolbenstange 37 umgibt. Das andere Ende der Feder 43 stößt gegen die vordere Kolbenfläche. Die Stützbuchse 25 stellt in ihrem Innern den Platz zur Aufnahme der zusammengedrückten Feder zur Verfügung.The piston 36 is moved back by a spring 43 which is supported on an inner flange 44 of the support bushing 25 and surrounds the piston rod 37. The other end of the spring 43 abuts the front piston surface. The support bushing 25 provides the space inside for receiving the compressed spring.

Der Arbeitsraum 13 des Gehäuses 10 ist durch einen Deckel 45 verschlossen. Bei abgenommenem Deckel können durch die entsprechende Öffnung hindurch die Komponenten des Kraftschraubers im Innern des Gehäuses montiert werden, einschließlich derjenigen Komponenten, die im Antriebsteil 12 untergebracht sind.The working space 13 of the housing 10 is closed by a cover 45. With the cover removed, the components of the power wrench can be mounted inside the housing through the corresponding opening, including those components which are accommodated in the drive part 12.

Wenn die Feder 43 den Kolben 36 in die Rückzugsstellung drückt, nimmt die Kolbenstange 37 über die Gelenkachse 42 auch den Mitnahmehebel 17 mit, jedoch erfolgt wegen der Ratsche keine Mitnahme des Ringteils 14 mit dem Mitnahmehebel.When the spring 43 presses the piston 36 into the retracted position, the piston rod 37 also takes the driving lever 17 with it via the hinge axis 42, but because of the ratchet there is no driving of the ring part 14 with the driving lever.

Claims (5)

  1. A power wrench with a housing (10) comprising a rotatable ring member (14) and a cylinder (21), and with a piston (36) movable within said cylinder (21), said piston having a piston rod (37), one end of which is rigidly connected to said piston, while the other end is connected through a joint (41) to an take-along lever (17) for rotating said ring member (14),
    characterized in
    that said cylinder (21) is open towards said ring member (14), said joint (41) moving around the axis of said ring member (14) when said take-along lever (17) is pivoted, the joint thereby changing the orientation of said piston rod (37) with respect to said cylinder (21),
    that said piston (36) has a single sealing groove at the equator of its circumferential surface, said sealing groove containing a sealing ring (39) biased radially outwardly, and
    that a spring (43) is provided that urges said piston (36) away from said take-along lever (17) and is supported at said housing (10).
  2. The power wrench of claim 1, wherein said cylinder (21) is constituted by a replaceable cylinder bushing (20) inserted into said housing (10).
  3. The power wrench of claim 2, wherein said cylinder bushing (20) is radially fittingly inserted into a bore (27) of said housing (10).
  4. The power wrench of claim 2, wherein a supporting bushing (25) is mounted within said housing (10), supporting said cylinder bushing (20) from the side of said take-along lever (17).
  5. The power wrench of claim 4, wherein said supporting bushing (25) has an inner shoulder (44) for supporting said spring (43).
EP92105760A 1991-04-10 1992-04-03 Power-driven wrench Expired - Lifetime EP0508316B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4111631A DE4111631A1 (en) 1991-04-10 1991-04-10 POWER SCREWDRIVER
DE4111631 1991-04-10

Publications (2)

Publication Number Publication Date
EP0508316A1 EP0508316A1 (en) 1992-10-14
EP0508316B1 true EP0508316B1 (en) 1995-12-06

Family

ID=6429245

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92105760A Expired - Lifetime EP0508316B1 (en) 1991-04-10 1992-04-03 Power-driven wrench

Country Status (3)

Country Link
EP (1) EP0508316B1 (en)
DE (1) DE4111631A1 (en)
NO (1) NO921340L (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9405697U1 (en) * 1993-05-06 1994-07-14 Wagner, Paul-Heinz, 53804 Much Power wrench
DE4330726C1 (en) * 1993-09-10 1995-02-23 Wagner Paul Heinz Power screwdriver/wrench
DE29607207U1 (en) * 1996-04-20 1997-08-21 Wagner, Paul-Heinz, 53804 Much Hydraulic power wrench
DE102004019425A1 (en) * 2004-04-19 2005-11-10 Hohmann, Jörg Pressure driven power wrench has a cylinder sleeve mounted inside an arm of a housing and with the pressurised fluid feed via the space between the housing and the cylinder
RU2510614C1 (en) * 2013-02-19 2014-04-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Пензенская государственная технологическая академия" Piston wrench with doubled ratchet gear

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4201099B1 (en) * 1978-08-14 1993-12-07 K. Junkers John Hydraulic wrench
DE3413202A1 (en) * 1984-04-07 1985-10-17 Wagner, Paul-Heinz, 5203 Much POWER SCREWDRIVER
JPS62203775A (en) * 1986-03-03 1987-09-08 株式会社西圧 Bolt-nut clamping device
DE3620753A1 (en) * 1986-03-15 1987-09-17 Wagner Paul Heinz HYDRAULIC SCREWDRIVER
DE3634591A1 (en) * 1986-10-10 1988-04-14 Black & Decker Inc Hammer drill with an air-cushion percussive mechanism
GB8701194D0 (en) * 1987-01-20 1987-02-25 Hedley Purvis Ltd Torque wrenches
DE3719893A1 (en) * 1987-06-13 1988-12-29 Wagner Paul Heinz HYDRAULIC SCREWDRIVER
US4825730A (en) * 1987-09-29 1989-05-02 Junkers John K Fluid operated wrench

Also Published As

Publication number Publication date
EP0508316A1 (en) 1992-10-14
DE4111631A1 (en) 1992-10-15
NO921340L (en) 1992-10-12
NO921340D0 (en) 1992-04-07

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