WO2010069865A2

WO2010069865A2 - Ring ratchet wrench

Info

Publication number: WO2010069865A2
Application number: PCT/EP2009/066905
Authority: WO
Inventors: André Müller; Ralf-Richard Richter
Original assignee: Wera - Werk Hermann Werner Gmbh & Co. Kg
Priority date: 2008-12-19
Filing date: 2009-12-11
Publication date: 2010-06-24
Also published as: WO2010069865A4; DE102008055558B4; WO2010069865A3; EP2396146A2; DE102008055558A1

Abstract

The invention relates to a screwing tool comprising a ring-shaped head (1), having a ring inner body (5, 6) and a ring outer body (4), wherein the ring inner body (5, 6) comprises an opening having a multi-jaw profile (9, 10) in order to transmit a torque to a fitting hexagonal profile of a screw head or of a nut, and wherein the ring outer body (4) surrounding the ring inner body (5, 6) is fastened to the free ends of a fork mouth (12) of a drive arm (2) using two diametrically opposite pivot pins (11) defining a pivot axis, such that the ring outer body can be pivoted about the pivot axis. In order to facilitate force screwing, wherein the drive arm lies in the plane of rotation, and quick screwing, wherein the drive arm lies in the axis of rotation, it is proposed that the ring inner body (5, 6) be coupled with the ring outer body (4) through a freewheel lock (7, 8, 13, 14) in such a way that the ring inner body (5, 6) can be rotated in a freewheel direction of rotation relative to the ring outer body (4) and is rotationally blocked in the opposite direction.

Description

Ratchet wrench

The invention relates to a screwing tool having an annular head, comprising an inner ring body and a ring outer body, wherein the inner ring body having an opening with a multi-jaw profile to a matching hexagonal profile of a screw head or a nut

Transmit torque, and wherein the surrounding the ring inner body

Ring outer body is pivotally mounted with two diametrically opposed pivot pin at the free ends of a fork jaw of a drive arm.

A screwing the aforementioned type is known from US 7,424,839 B2. The screwing tool described therein has a drive arm, which forms a fork mouth at its free end. In this fork jaw screw heads can be used with multi-jaw profiles of different key widths, which have a hexagonal outline outline. The head is attached to the free ends of the Gabelmaules with pivot pins, so that the drive arm can both lie in the plane of rotation and can take a pivotal position to the plane of rotation and in particular a 90 ° -Schwenkstellung to the turning plane. In the 90 ° swivel position, the screw head can be rotated by turning the drive arm around its own axis.

A screwing tool is known from DE 921 198, in which an annular inner body rests in one end-side eye of the drive arm, which is locked to the eye via a freewheeling lock in such a manner that the inner ring body is rotatable in a freewheeling direction relative to the outer ring body and in the opposite direction is blocked. The locking piece of the freewheel gear is here in a neck portion of the drive arm. The US 5,636,557 describes a screwing with a drive arm and arranged at the end of the drive arm reversible freewheel lock, which has a drive square. Described there is also a screwing tool with a drive arm, at one end of a ring spanner and at the other end an open-end wrench sits.

DE 10 2007 049 304 A1 describes a screwing tool having a drive arm, which forms a handle at its handle end and a fork mouth at its other end, wherein a freely rotatable sleeve is arranged between the handle and the fork mouth. In the fork mouth is a head with a switchable freewheel gear. An output square protrudes from the head. The head can be blocked in different swivel positions to the handle arm.

The US 3,475,999 describes a screwing tool with a pivotally mounted on a drive arm head, wherein the head has a square opening for insertion of a screwing tool with a corresponding square profile. The square profile sits in an inner ring body, which is rotatable relative to the head by means of a Freilaufgesperres only in one direction. The pivot axis extends here in a radial extension of the head, which also stores the locking piece of the freewheel gear.

The invention is based on the object, the genus in contemporary screwing, with a power screws, wherein the drive arm is in the plane of rotation, and a quick-release screws, in which the drive arm is located in the axis of rotation, it is possible to further develop nutzsvorteilhaft.

The object is achieved by the invention specified in the claims, each claim is basically an independent solution to the problem but is preferably an advantageous development of the specified in claim 1 screwing. First and essentially it is provided that the ring inner body is coupled to the ring outer body via a freewheel mechanism such that the ring inner body is rotatable in a freewheeling rotational direction relative to the Ringaußenkör- and in the opposite direction rotationally blocked. According to this embodiment, a ring ratchet wrench, with both the quick and the power screws is possible. The ring outer body is the carrier of a toothed locking piece. The toothing may be, for example, a saw toothing or a 90 ° toothing. The ring inner body may be like the ring outer body in one or more parts. It is rotatably mounted in the ring outer body and has on its outer wall a corresponding toothing of the locking piece counter teeth, in which the teeth of the locking piece can engage. For this purpose, the locking piece is acted upon by a spring element spring force. The spring element may be a leaf spring, a compression spring or a plastic spring. However, the spring element can also be formed by a soft plastic part or a rubber part. In a first variant, it is provided that the locking piece be arranged in the outer ring body somewhere between the two hinge pin defining a hinge axis. The spring element acts essentially in the tangential direction on the locking piece. The locking piece can be arranged in a pocket of the ring outer body. The latter has thereby a small wall thickness. The ring outer body preferably has a circular outer contour. Ring inner body and ring outer body are arranged coaxially to each other. To reduce the wall thickness of the ring outer body that locking piece may alternatively be associated with one of the joint axis defining the pivot pin. Preferably, both diametrically opposed pivot pin carry a respective locking piece, each locking piece is spring-loaded by a pressure spring acting in the radial direction. The ring outer body, which has a substantially circular outer contour, is seated pivotably about the articulation axis in an inner contour that is shaped to match the outer contour of the outer ring of the ring. send fork mouth. The freewheel gear does not need to be reversible, which simplifies the structural design. The head, which is equipped with a non-directional freewheel mechanism, is 180 ° reversible in the forked jaw relative to the articulation axis. To change the direction of the head is only to turn 180 °, this being done by rotation of the head around the pivot pin. The drive arm carries a blocking member with which the head is preferably pivotable in both pivot positions. But it is also envisaged that the head is schwenkblockierbar only in a pivoting position. In these two pivot positions, the drive arm lies in the plane of rotation of the freewheel mechanism. Preferably, further pivot positions are provided, in which the arm is not in the plane of rotation. Preferably, the arm is in the other pivot positions by 15 ° inclined to the plane of rotation. The head can also be blocked in these pivot positions. However, it is also envisaged that the head can only be blocked in these 15 ° swivel positions. The drive arm can be a forged flat steel with a bearing section on which a rotatable grip sleeve is rotatably mounted. The grip sleeve is rotatable about the longitudinal direction of the drive arm. At her can hold the drive arm when the screwdriving tool is operated in the Schnellschraubstellung, in which the drive arm, so the axis of rotation of the grip sleeve in the axis of rotation of the multi-jaw profile of the head, so the Freilaufgesperres. With the other hand then a rotary motion can be applied to the handle. In a preferred embodiment of the invention, the fork leg opposite end of the drive arm carries a wrench profile. The wrench profile and the multi-jaw profile of the head have the same wrench size. The ring inner body may have two multi-jaw profile sections which have the same spanner size. However, the two multi-jaw profile sections are arranged offset in rotation by 15 ° or 30 ° from each other in the ring outer body. As a result, sections of one polygonal profile lying between two polygonal corners form stop zones for the broad side of a section inserted in the other polygonal profile. th hexagonal profile of a screw head or a nut. The sections form jaws which engage in the area of the hexagonal corners of the hexagonal profile. Two sections engaging at one corner of the hexagonal profile form an angular recess whose apex forms a multi-cornered corner. Two adjoining angular recesses form a serration which projects radially into the polygonal cavity of the inner ring body. This point lies in the area of the angular recess of the other polygonal profile section. The blocking member, with which the head can be locked in different rotational positions relative to the drive arm, is preferably formed by a blocking pin, which can be displaced from a gripping handle against the restoring force of a spring from a blocking position into a release position. A blocking end of the blocking pin engages in the blocking positions in latching recesses, which are arranged in the outer wall of the ring outer body.

In a further development of the invention it is provided that the drive arm has a crank. The drive arm can form two angle legs. These can be angled at 30 °, 60 ° and preferably at 90 °. The shorter of the two angle legs carries the fork mouth, in which the rotatable, a Freilaufgesperre having head sits. According to this embodiment, a cranked ring spanner is formed with ratchet mechanism.

In a further development of the invention, it is provided that the polygonal opening of the ring inner body has an encircling groove approximately in the axial center. In this circumferential groove is a spring ring, which is elastically expandable. In the unexpanded state of the spring ring forms stop zones for lying in the corner area end portions of a nut or a screw head. The preferably slotted ring has in the unexpanded state an inner diameter which is smaller than the distance between two diametrically opposite corner regions of the polygonal opening. The annular groove has such a depth that the expanded ring can enter there so far that it does not protrude into the polygonal profile. He does not work then as Stop, but as a frictional adhesive to hold a fully inserted into the polygonal hole nut or fully inserted there screw head. The expanded spring ring is frictionally engaged at the corners of the polygonal profile of the nut or screw head.

Embodiments of the invention are explained below with reference to accompanying drawings. Show it:

Fig. 1 is a perspective view of a first embodiment of the invention;

FIG. 2 is a plan view of the broad side of the first embodiment; FIG.

Fig. 3 is a side view of the first embodiment;

4 shows a section along the line IV - IV in Fig. 2.

Fig. 5 is a section along the line V - V in Fig. 2;

6 shows a section along the line VI - VI in Fig. 3;

7 shows an illustration according to FIG. 6 of a second exemplary embodiment;

8 shows a representation according to FIG. 5 of the second exemplary embodiment;

9 is a view according to FIG 3, wherein the head is inclined relative to the drive arm 15 °.

10 is a view according to FIG 9, wherein the head is inclined relative to the drive arm by 90 ° ..; Fig. 11 shows a third embodiment of the invention in which the drive arm is cranked;

12 is a fourth embodiment of the invention in a representation according to FIG. 7,

13 shows the fourth embodiment of the invention in a representation according to FIG. 8,

14 shows a fifth embodiment of the invention in a representation according to FIGS. 7 and

Fig. 15 shows a sixth embodiment of the invention.

The wrench shown in the drawings has a made of steel, in particular forged drive arm 2, which has a fork jaw 12 at one end and at its other end a spanner head 31. Between the two ends there is a widened or rounded zone 32, which is provided with an embossed handle structure. In the exemplary embodiments illustrated in FIGS. 1 to 10, the region of the drive arm adjoining the fork jaw 12 is thickened. There is a mass collection. Within this thickened portion is a blocking device comprising a blocking pin 26 which is mounted in a crown hole of the Gabelmaules 12. The end of the bore forms a recess 28 for supporting a compression spring 29, which is supported on the bottom 28 'of the recess 28 and applied to the other end of the end face of the locking pin 26. For displacement of the blocking pin 26 against the restoring force of the spring 29, two sliding handles 30 are provided, which are each accessible from a broad side of the drive arm 2 ago. The fork jaw 12 has a fork opening extending along a circular line, in which a head 1 is pivotally mounted. For the pivotable mounting of the head in the fork jaw 12, pivot pins 11 are provided, which engage in recesses 15 of the head 1, which are diametrically opposed. The free ends of the fork legs of the Gabelmaules 12 form bearing eyes 16, which in particular have a larger or smaller diameter than the recesses 15 and in which a particular diameter-enlarged or diameter-reduced portion of the pivot pin 11 is located.

The head 1 consists of a ring outer body 4, which forms the recesses 15 for receiving the pivot pin 11 and which has a circular outer contour. The outer circumferential surface of the ring outer body 4 is designed spherical and fits with a small undersize in the fork opening of the fork mouth 12th

In the spherical outer wall of the ring outer body 4 are rotatably offset by 90 ° to the rotation axis defined by the pivot pin 11 recesses 27 provided. In total, three Rastausnehmun- gene 27 are milled into two diametrically opposite outer wall sections of the outer ring body 4, in which a reduced diameter detent end 26 'of the locking pin 26 can engage to pivot the head 1 relative to the drive arm 2 schwenkzublockieren. There is provided a 0 ° blocking position shown in Figure 8 and two each by about 15 ° inclined blocking positions.

In the exemplary embodiment, the wall thickness of a pocket 17 is reduced by the position of the recesses. It is therefore also envisaged to provide the locking recesses only on one side or to provide two locking recesses on one side and only one locking recess on the other side. It is also possible to restrict the locking recesses only to the 15 ° inclination position. Within the ring outer body 4 is an inner ring body, which may be designed in several parts. The ring inner body 5, 6 has a multi-jaw profile 9, 10 for engagement with the hexagonal surfaces of a screw head or a nut, in particular in the corner region of these surfaces. The multi-jaw profile 9, 10 has the shape of radially inwardly projecting teeth or serrations, wherein between the teeth or spikes angular recesses are formed, in which the corner regions of the hexagonal profile of the screw head can accommodate. The angular recess has a profile apex 24, 24 'and outgoing therefrom profile edges 23, 23'. The profile flanks 23, 23 'extend on planes that converge in the profile apex 24, 24' at an angle of 120 °.

By means of one of a spring element, here by a compression spring 8 loaded locking piece 7, which has a toothing, here a saw tooth 14 which engages in a counter toothing 13 of the ring inner body 5, the ring inner body 5, 6 against the ring outer body 4 is rotationally locked in one direction , In the opposite direction, however, the ring inner body 5, 6 can rotate relative to the ring outer body 4.

The embodiment shown in Figures 1 to 6 differs from the embodiment shown in Figures 7 and 8 essentially by the design of the freewheel gear and by the configuration of the multi-jaw profile 9, 10, wherein the multi-jaw profile of an embodiment but also with the Freilaufgesperre the other embodiment can be equipped.

In the first embodiment shown in Figures 4 to 6 have the two diametrically opposed pivot pin 11 extending in its axial direction pockets 17 which are open to the fork opening of Gabelmaules 12 out. In the bottom of the pocket 17 is a blind bore 19th On the bottom of the bore 19, a compression spring 8 is supported, which acts relative to the axis of rotation of the ring inner body 5, 6 in the radial direction. The other end of the compression spring 8 is supported on a locking piece 7. The substantially triangular cross-section locking piece 7 has at an angle of about 90 ° to each other extending flanks 18 which extend parallel to walls 17 'of the pocket 17 of the pivot pin 11, which pocket 17 extending obliquely to the bore 19 for the spring 8 followed. The third triangular side of the locking piece 7 has the saw toothing 14, which engages in the external toothing 13 of the ring inner body 5.

If the ring inner body 5 is rotated in the direction of the arrow shown in Figure 6, ie in the freewheeling direction, the teeth of the teeth 13 undercut the teeth 14 of the locking piece 7, which acted by the compression spring 8 in the radial direction locking piece 7 deviates in the radial direction to the outside, whereby the compression spring 8 is tensioned.

If the ring inner body 5 is rotated in the opposite direction, ie in the blocking direction, the engagement of the saw teeth 13, 14 is maintained. The locking piece 7 is towed against the wall 17 'of the pocket 7. On this wall 17 'is the edge 18 of the locking piece 7 at. Since the two mutually parallel flanks 18, 17 'extend obliquely to the radius and inclined to a tangent, a radially inwardly directed force component is formed, which ensures that the tooth engagement of the teeth 13, 14 is maintained even at high torques.

The inner ring body of the embodiment shown in Figures 4 to 6 is designed in several parts. But it can also consist of one part. The ring inner body 5, 6 has in particular two multi-jaw profile sections 9, 10 offset by 15 ° with respect to one another in the direction of rotation, wherein each of the two multi-jaw profile sections 9, 10 is assigned to one of the two inner ring body parts 5, 6. The two inner ring body parts 5, 6 lie in the axial direction offset each other. As a result of the 15 ° offset, a tooth of the multi-jaw profile 9 formed from two profile flanks 23 projects beyond an angle recess of the multi-jaw profile 10 formed by two profile flanks 23 'which intersect in a profile peak 24'. The tooth forms a stop flank 25 pointing towards the multi-jaw profile 10. on which a broad side portion of a plugged into the multi-jaw profile 10 screw head rests.

If the head 1 is pivoted by 180 ° about the hinge axis 11, then the hexagonal profile of a screw head can be inserted into the other multi-jaw profile 9 of the ring inner body part 5. The direction of rotation of the screwing tool has changed. Even now, the screw head can be inserted only about halfway into the head 1, since a broad side portion of the head is supported on the stop flank 25 'of the ring inner body part 6. This stop flank 25 'is also formed by one of two profile flanks 23' formed tooth.

The two inner ring body parts 5, 6 are assembled in the axial direction. But the two ring body parts can also be glued together or be partially extruded. For positive fixing of the two inner ring body parts 5, 6 connecting pin portions 21 are provided, which engage in corresponding recesses. For axial captivation of the multi-part ring inner body 5, 6 is a retaining ring 22. This forms a counter-shoulder to a formed by the annular body 6 retaining shoulder.

In the second embodiment shown in Figures 7 and 8, the locking piece 7 is in a pocket 17 of the ring outer body 4, which is open to the cavity of the ring outer body 4 out. The wall 17 'of the pocket 17 extends on an arc portion and in particular in the region of an edge 18 of the locking piece 7 both inclined to a radial and inclined to a tangential, based on the axis of rotation of the ring inner body fifth Approximately tangentially opposite the flank 18, the locking piece 7 has a pin extension 20, which engages in the opening of a helical compression spring 8, this acting on the axis of rotation of the ring inner body 4 in the tangential direction compression spring 8 is supported on the bottom of a bag 19. The locking piece 7 has in the radial inward projecting sawtooth-shaped teeth 14 which cooperate with the external teeth 13 of the ring inner body and form a freewheeling mechanism in the manner described above. If the ring inner body 5 is rotated in the direction of the arrow shown in FIG. 7, ie in the freewheeling direction, the saw teeth 13 undercut the teeth 14 of the locking piece 7. The latter can dodge along the wall 17. If the ring inner body 5 is rotated in the opposite direction, then the toothing locks.

In this embodiment, only one multi-jaw profile 9 is provided. But it is also possible to design the inner ring body with two offset by 15 ° to each other Mehrbackenprofilabschnitten here.

The screwing tools described above can be used on the one hand in the operating position shown in Figure 3, in which the drive arm 2 is in the plane of rotation of the head 1. This operating position is the Kraftschraubstellung. In this operating position, the end 26 'of the blocking pin 26 engages in the middle latching recess 27 a. In a second operating position, which is shown in Figure 9, engages the end 26 'of the blocking pin 26 in one of the two other locking recesses 27, so that the drive arm 2 protrudes sideways inclined by about 15 ° to the plane of rotation.

In a third operating position, which is shown in Figure 10, the drive arm 2 has an angle of 90 ° to the rotational plane of the head 1. The drive arm 2 is now in the axis of rotation. A rotary motion can be applied to the head 1 by rotating the drive arm 2 about its extension axis. To simplify this, the drive arm 2 has one on one circular bearing section clipped rotatable sleeve 3. The latter can be made of plastic and have a slot that allows the plugging.

In the exemplary embodiment illustrated in FIG. 11, the head 1 can have one of the two freewheel transmissions described above and preferably a ring inner body configuration according to FIGS. 4 to 6. A blocking member 26 is not required here, since the drive arm 2 forms a right angle in the region of a kink 2. The longer angle leg 2 ¹ forms a handle arm, at the end of which is an open-end wrench head 31. The shorter angle leg 2 "forms the fork jaw 12, at the free end by means of pivot pin 11 of the freely pivoting head 1 is attached. In this embodiment, it is a "cranked ratchet wrench ^11. Again, the direction of rotation is reversed by pivoting the head 1 by 180 ° about the pivot pin 11th

In the fourth exemplary embodiment illustrated in FIGS. 12 and 13, the inner ring body 5 essentially has the design of the second exemplary embodiment, which is illustrated in FIGS. 7 and 8. The profile flanks 23 extend from one broad side of the head to the opposite broad side of the head. However, they are interrupted in the axial center by a circumferential groove 33. In this groove is a slotted spring ring 34 a. The slotted spring ring 34 is elastically expandable. The groove has such a depth that the flared ring can completely withdraw behind the profile apex 24. The unexpanded ring, however, lies radially inside the profile apex 24 and overlaps the profile flanks 23, so that it acts as a stop in the corner regions formed by the profile flanks 23, for a screw head or a nut inserted into the opening of the polygonal jaw profile 9. The lying in the corner of this hexagonal profile end portions strike the profile flanks 23 overlapping portions of the spring ring 34 at. The spring ring 34 thus limits the immersion depth of the hexagonal profile of the nut or the screw head. This prevents that during quick screwing the nut or the screw head slips through the multi-jaw profile 9. On the other hand, the radial deflectability of the spring ring also allows complete insertion of the nut or screw head into the multi-jaw profile 9, so that optimum torque transmission is ensured. For this purpose, an axial pressure is exerted on the screw head 1. In this case, the spring ring 34 expands so that it can slip over the corners of the hexagonal profile. In this case, the spring ring 34 exerts a frictional force on the hexagonal profile.

In one embodiment, not shown, the circumferential groove shown in Figures 12 and 13 is not in the axial center, but close to the edge of the opening. In this embodiment, two circumferential grooves are provided, which are each arranged near the edge of the two opposite openings of the polygonal profile. In each of the two circumferential grooves an elastically expandable ring is such that it exerts a clamping function in the unexpanded state. The other ring then exercises the stop function.

In the fifth exemplary embodiment shown in FIG. 14, the inner ring body 5 is formed essentially in one piece and has an outer toothing 13, which is shown as a saw toothing. However, this toothing can also be formed by a 90 ° toothing. The counter-toothing 14 of the locking piece 7 has a corresponding shape. In this embodiment, the locking piece 7 is located in a radial recess 17 of the ring outer body 4 a. The radial recess 17 is made with a disc milling cutter and has an arcuate control wall 17 ', which cooperates with a flank 18 of the locking piece 7. In this embodiment, a leaf spring 8 acts on the locking piece 7, that its edge 18 is pressed against the control edge 17 '. In addition, the leaf spring 8 bent to form a U develops a radial component on the locking piece 7. For this purpose, the leaf spring 8 engages with a locking element 7. nem short leg into a groove of the locking piece 8. The longer leg of the leaf spring 8 is supported on the rounded wall of the pocket 17 from.

In the sixth embodiment shown in FIG. 15, the inner ring body 5 is likewise formed in one piece. Again, the multi-jaw profile 9 is formed by rounded profile flanks 23, 24. The profile flanks 23, 24 extend on arc sections. In particular, the inner apex curves on to avoid stress concentrations. In this embodiment, the pocket 17 for receiving the locking piece 7 as well as in the fifth embodiment shown in FIG. 14 in the region between the two pivot pins 11 is arranged, but off-center. This has the consequence that the area lying centrally between the pivot pin 11 is not weakened by the pocket 17. The configuration of the pocket and the locking piece 7 located therein essentially corresponds to that of the fifth embodiment shown in FIG. 14. Also in the sixth embodiment, the teeth may be a saw toothing or a 90 ° toothing. Instead of the U-shaped leaf spring used in the fifth embodiment, an elastic member in the form of a rubber or plastic body is used in the sixth embodiment. The elastic element 8 has a shape that adapts to the wall contour of the pocket 17. This spring element 8, in addition to a radial force component, develops a tangential force component on the locking piece 7.

All disclosed features are essential to the invention. The disclosure content of the associated / attached priority documents (copy of the prior application) is hereby also incorporated in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application.

Claims

1. screwing tool having an annular head (1), comprising an inner ring body (5, 6) and an outer ring body (4), wherein the Ringin- nenkörper (5, 6) has an opening with a multi-jaw profile (9, 10) to a matching hexagonal profile of a screw head or a nut to transmit a torque, and wherein the ring inner body (5, 6) surrounding ring outer body (4) with two diametrically opposite, a hinge axis defining pivot pin (11) at the free ends of a fork jaw (12) a drive arm (2) to the

Pivot axis is pivotally mounted, characterized in that the ring inner body (5, 6) with the ring outer body (4) via a freewheel - lock (7, 8, 13, 14) is coupled such that the ring inner body (5, 6) in one Freewheeling direction of rotation with respect to the ring outer body (4) is rotatable and rotationally blocked in the opposite direction.

2. Screwing tool according to claim 1 or in particular according thereto, characterized in that the freewheel locking at least one of the ring outer body (4) associated, a toothing (14) exhibiting locking piece (7), the toothing (14) acting on the locking piece Spring element (8) in an outer toothing (13) of the ring inner body (5, 6) engages.

3. Screwing tool according to one of the preceding claims or in particular according thereto, characterized in that the locking piece (7) in

Ring outer body (4) between the two pivot pin (11) sits and the spring element (8) acts on the locking piece (7) substantially in the tangential direction.

4. Screwing tool according to one of the preceding claims or in particular according thereto, characterized in that one of the two articulated spigot (11) or both pivot pins (11) each carries a locking piece (7) which is spring-loaded substantially in the radial direction on the outer toothing (13) of the ring inner body (5).

5. Screwing tool according to one of the preceding claims or in particular according thereto, characterized in that the ring outer body (4) has a substantially circular outer contour and the fork mouth (12) has a shape-adapted inner contour.

6. Wrenching tool according to one of the preceding claims or in particular according thereto, characterized in that the with a non-direction reversible freewheel mechanism (7, 8, 13, 14) equipped head (1) is umwendbar 180 ° in the fork jaw (12) and in particular in one or both pivotal positions offset by 180 ° pivoting with a blocking member (26) associated with the drive arm (2) is pivotable.

7. Screwing tool according to one of the preceding claims or in particular according thereto, characterized in that the drive arm (2) in the plane of rotation of the Freilaufgesperres (7, 8, 13, 14) and in different

Pivoting positions for Dreivele is schwenkblockierbar.

8. Screwing tool according to one of the preceding claims or in particular according thereto, characterized by a the drive arm (2) associated, around its extension axis freely rotatable grip sleeve (3).

9. Screwing tool according to one of the preceding claims or in particular according thereto, characterized in that the fork mouth (12) opposite the end of the drive arm (2) forms a further fork mouth with head stored therein or an open-end wrench profile (31), in particular, the wrench size of the open-end wrench profile (31) corresponds to the key width of the polygonal jaw profile (9, 10).

10. Screwing tool according to one of the preceding claims or in particular special, characterized in that the ring inner body (5, 6) has two offset in the direction of the ring axis arranged identically shaped polygonal jaw profiles (9, 10), in the direction of rotation about the ring axis offset from each other, that between two Mehrkantecken (24, 24 ') lying portions (23, 23') of a polygonal jaw profile (9, 10) stop zones (25, 25 ') form for the broad side of one in the other

Polygonal profile (9, 10) inserted hexagon profile of a screw head or a nut.

11. Screwing tool according to one of the preceding claims or in particular according thereto, characterized in that the drive arm (2) is cranked and in particular two angle legs (2 ¹ , 2 ") is formed.

12. Screwing tool according to one of the preceding claims or in particular according thereto, characterized in that the fork jaw (12) forming the angle leg (2 ") is shorter than the other angle leg

(2 ¹ ) -

13. Screwing tool according to one of the preceding claims or in particular according thereto, characterized by at least one in the polygonal opening of the ring inner body (5) arranged, circumferential groove (33) in which an elastically expandable ring (34) rests in such a way that it non-expanded state with sections projecting into the multiple-edge regions (23) forming stop zones for broad-side sections of a polygonal profile of a screw head of a nut inserted into the polygonal opening and in the expanded state edged edges of the polygonal profile of the screw head or the nut comprises.

14. Screwing tool according to one of the preceding claims or in particular according thereto, characterized in that the locking piece (7) acting on the spring element (8) is a compression spring, a leaf spring or an elastic plastic or rubber body.