DE20211034U1 - Two-armed tool ratchet, extension with two tool nuts, as well as the two-armed tool ratchet and the extensive tool set - Google Patents

Description

File number
New registration
HÖPFINGER, Siegfried

Our sign H7157/UP

Munich ■ Hamburg ■ Dusseldorf New York

Patent attorneys

Dr. Walter Maiwald (Munich) Dr. Volker Hamm (Hamburg) Dr. Stefan Michalski (Düsseldorf) Dr. Regina Neuefeind (Munich) Dipl.-Ing. Udo Preuss (Munich) Dipl.-Ing. Korbinian Kopf, M.A. (Munich) Dr. Norbert Hansen (Munich)

Lawyer

Stephan N. Schneller (Munich)

In co-operation with:
Maiwald Inc., New York Dipl.-Ing. Korbinian Kopf, MAUS Patent Agent

Dr. Schmidt-Felzmann & Kozianka Attorneys at Law (Hamburg)

Parr ■ Diving ·

Leutheusser-Schnarrenberger Attorneys at Law (Munich · Starnberg)

Munich, 22 July 2002

HÖPFINGER, Siegfried
Oedgassen 4, 84437 Reichertsheim

Two-armed tool ratchet, extension with two tool sockets, as well as the two-armed tool ratchet and the extension comprehensive tool set

Technical area

The present invention relates to a tool ratchet and in particular to a
Tool ratchet for use in assembly work on water slide valves, as used in above-ground and underground hydrants as well as in ordinary house water connections. The invention also includes a special extension that can be used on the

UP:UM

PO Box 330523 · 80065 Munich ■ Elisenhof ■ Elisenstrasse 3 ■ 80335 Munich

Tel. +49 (0)89 74 72 660 ■ Fax +49 (0)89 77 64 24^ httpy/www.nrowald.de i.ijaio.@maiwgld.de .

Managing Director: Dr. Walter Tai&aiä ¹ ■ D&VeHeer'Mamnoi ■ Dr.'Stefan MJchölski.'CJ-. ßegini Nfeuefeind ■

HRB No. 111307

Tool ratchet can be attached. Furthermore, the invention relates to a tool set comprising the tool ratchet and the extension.

Due to the often very high water pressures acting on slide valves, which greatly increase the friction of the slides in their guides, the mechanical actuating devices of the slide valves are often very difficult to operate. To make matters worse, the environmental conditions in which such slide valves are used mean that the mechanical actuating devices and other mounting devices of the water slide valves rust due to corrosion or become clogged with dirt. This also makes it considerably more difficult to remove the actuating and mounting devices of a water slide valve. To make matters worse, the water slide valves on underground hydrants, for example, are often very difficult to access. This problem occurs in a similar way with water slide valves located near spatial obstacles (e.g. fences, walls) or with line slide valves arranged in shafts.

Background of the invention

Tool ratchets are usually designed in such a way that they consist of a ratchet body that accommodates the ratchet mechanism, with a lever arm molded onto it. This is the basic form of a tool ratchet. The ratchet mechanism usually has a device that allows the tool ratchet to be used in either right or left-hand operation. In addition, the tool ratchet usually has a drive shaft onto which different tool attachments such as tool sockets, extensions or joints can be attached. These tool attachments can be selected from a variety of tool inserts that are included in the well-known tool ratchet boxes.

Since, due to the standardized sizes of water slide valves in Germany, for example, essentially only two sizes of tool sockets are possible, the large number of remaining sockets and other tool attachments are usually carried around unused, which unnecessarily increases the weight of the tool ratchet box.

The basic form of a tool ratchet described above is often associated with various problems. One of the problems is that the one lever arm often cannot apply a sufficiently large torque to the drive shaft, which is required, for example, to loosen a stuck screw. Another disadvantage is that the lever arms of the well-known single-arm tool ratchets often tend to bend when very large torques are applied. Since such tool ratchets are usually made of cast steel, which is known to have a very pronounced brittle fracture behavior, the lever arms often break under great stress, even without warning.

In order to counteract these negative influences, US 5,921,157 provides for a basically single-armed tool ratchet with a second lever arm that can be screwed on at 90° to one of the lever arms of the tool ratchet. However, the tool ratchet with the screw-on second lever arm proves to be problematic in that the screw-on coupling piece provided there is sensitive to bending under high torques. In addition, the tool ratchet of US 5,921,157 proves to be unsuitable for use in the assembly of water slide valves. The second screw-on lever arranged at 90° to one of the levers of the tool ratchet only proves to be useful for the main application of this ratchet, namely car wheel assembly. However, this ratchet is completely unsuitable for assembly work on water slide valves, since the second lever arm screwed on at 90° is more of an obstacle than a useful tool. Due to the mostly inclined actuation devices of the

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Water slide valves, the second lever arm arranged at 90° is hardly useful here and can only be operated to a very limited extent.

Description of the invention

In view of the problems described, according to a first aspect of the invention, a completely new improved tool ratchet is provided, which comprises a ratchet body with at least two lever arms detachably attached thereto, which are essentially opposite one another, separated by the ratchet body. The ratchet body accommodates a generally known ratchet mechanism with a drive shaft for coupling to a tool attachment. The ratchet mechanism is not discussed in detail here. In principle, however, any ratchet mechanism suitable for right/left operation can be used for the present invention.

According to a further aspect of the invention, at least two shafts are formed on the ratchet body, which are designed in such a way that a lever arm can be placed on each of them, which is why the lever arms are at least partially hollow on the inside. To ensure that the lever arms cannot accidentally slip off the shafts, the shafts each have locking devices that are suitable for securing the shafts against unwanted slipping relative to the lever arms. These are, for example, spring-mounted balls or pins that snap into a recess or opening in the other part in a form-fitting or force-fitting manner.

The two shafts are arranged on the ratchet housing in such a way that they face each other at 180°. Both the ratchet body with the shafts molded onto it and the two lever arms are made of steel, preferably cast steel. High-quality tempered C45 steel or chrome-vanadium steel (CrV 3) are particularly suitable materials for manufacturing the two-arm tool ratchet.

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Instead of the socket plug connection provided here, the levers can of course also be screwed onto the ratchet body or attached to it in another way that ensures a positive or non-positive fit.

The two lever arms have handles at their respective ends for convenient manual operation, via which a force is applied to the lever arms and which is converted by the lever arms into a corresponding torque.

If, in order to generate a torque of magnitude M with the single-armed tool ratchets known from the prior art, a force F was required with a given lever arm length 1 (M = F * 1), then with the two-armed tool ratchet according to the invention it is sufficient to apply a force of magnitude F/2 to each of the two lever arms, which also have a length 1, in order to generate the required torque M (M = F/2 * 1 + F/2 * 1 = 2 * F/2 * 1 = F * 1). From this consideration it is also easy to see that it would also be conceivable to provide three or more lever arms instead of the two lever arms in order to achieve a further reduced effort per lever arm in order to generate a torque of magnitude M = F * 1. However, since the tool ratchet is operated manually by human power, the two-armed design is particularly preferable.

As just explained, the arrangement of two lever arms allows the force required per lever arm to generate a certain moment to be halved. This has the advantage that less force has to be applied per lever arm. This means that less effort is required to tighten a screw with the tool ratchet according to the invention, for example.

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However, the tool ratchet according to the invention also makes use of another effect: in order to generate a moment of magnitude M with a one-armed tool ratchet, a force of magnitude F is required (with a lever arm of length 1). If this force F is applied by a person to the single lever arm of the tool ratchet, a reaction or support force F' corresponding to this force F is inevitably created, which is transferred by the person to their standing surface. This force F' is diverted in this way and is thus lost unused.

This reaction force F' can be used effectively with the present invention. If the force F ¹ "fizzles out" unused in the ground with single-arm tool ratchets, the reaction force F' with the tool ratchet according to the invention can be used to apply it to the second lever arm according to the invention. In order to operate the tool ratchet according to the invention, a person must pull on one of the two levers (lever arm length 1) with the force F. With the tool ratchet according to the invention, it is no longer necessary for the associated force F' to be diverted into the ground via the person, but the person can apply the force F' as a pressure force on the second lever arm. The force F', which the person has to apply anyway, can thus be used effectively.

This also represents a clear advantage over US 5,921,157, since the second lever in the US publication, which is arranged at 90°, does not allow the use of the reaction force in this way.

A further advantage of the present invention is that the arrangement of at least two lever arms according to the invention means that the force F required per lever arm to generate a certain moment M is lower than with just one lever arm. Each lever arm therefore has to be able to transmit less force, which is why the lever arms are less likely to bend or even break.

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A further advantage of the tool ratchet according to the invention is that the tool ratchet can be dismantled into its individual parts (lever arms and ratchet body). This dismantling ensures that the tool ratchet can be easily transported in a tool case and that the tool ratchet takes up relatively little space. The ability to remove the lever arms also proves to be very advantageous in assembly conditions where the second lever arm represents an obstacle due to the spatial conditions. If the second lever arm hits an obstacle when turning the tool ratchet, for example, it can be easily removed, which improves the freedom of movement for the tool ratchet.

Another advantage provided by the detachability of the lever arms is that, as an alternative to a standard lever arm set, longer levers may also be able to be attached to the ratchet body in order to apply greater torques with less effort.

According to a further aspect of the present invention, the tool set according to the invention comprises, in addition to the two-armed tool ratchet, an extension that can be attached to it with a first tool socket and a second tool socket, which is also referred to below as a drop socket. Both the attachable extension and the drop socket are made of steel, preferably cast steel. High-quality tempered C45 steel or chrome-vanadium steel (CrV 3) have proven to be particularly suitable materials for the manufacture of both the drop socket and the extension.

The extension can consist of just one rod section, or it can be made up of at least two rod sections, whereby the individual rod sections are detachably connected to each other using suitable means. The attachable extension is attached to the drive shaft of the two-armed tool ratchet via a sleeve.

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A first tool nut is arranged on the side of the extension opposite the sleeve. The elongated extension extends between the first tool nut and the sleeve.

A so-called drop nut is arranged on the extension and can be moved in the longitudinal direction and pushed over the first tool nut. The outer contour of the first tool nut and the inner contour of the drop nut are coordinated in such a way that they fit together in a form-fitting manner. This form-fitting is necessary so that the drop nut is suitable for transmitting torque when pushed over the first tool nut. Instead of the form-fitting, the torque can of course also be transmitted via frictional locking or by other means. So that the drop nut cannot be moved in the longitudinal direction of the extension in this position, it is locked to the extension or the first tool nut with a screw or a locking pin.

The great advantage of the inventive attachable extension with a drop nut is that it provides a combined tool that makes the multitude of conventional tool nuts that are normally found in a ratchet tool box superfluous. As a special tool for opening and closing water slide valves, which are of standard size in Germany, the two tool nuts - the first tool nut and the drop nut - are often sufficient.

For use in opening and closing small water slide valves, which are mainly found in private households, the drop nut is pushed back onto the extension and locked there with a screw or via a spring-loaded locking pin that snaps into a locking opening in the drop nut, on the extension or the first tool nut, thereby exposing the smaller first tool nut. The first smaller drop nut can be used in this position to

To open or close the water slide valve using the two-armed tool ratchet.

If the tool is now to be used again to open or close a much larger water slide valve, such as those found on above-ground or underground hydrants, the drop nut is pushed back over the first tool nut and locked in this position. In this position, the first tool nut is more or less pulled over by the drop nut. In this position, the drop nut can now be operated via the extension using the two-armed tool ratchet, for example to open or close the valve on the underground hydrant. Due to the installation position of underground hydrants, an extension is required here, as a ratchet cannot be inserted into the opening in which the hydrant is located. The extension is particularly helpful here, as it means the operator does not have to bend down to operate the underground hydrant.

As can be seen from the above explanations, it is therefore sufficient to use two tool nut sizes due to the standardized sizes of the water slide valves and the associated actuating devices in Germany, for example. In Germany, this is the drop nut with a size of 32 mm and the first tool nut with a size of 15 mm. Of course, it is also conceivable to provide other sizes for both the drop nut and the first tool nut in order to meet other areas of application or the standards of other countries. The sizes given in Germany refer to the internal dimensions of the square nuts required in Germany. Of course, hexagon nuts can also be used instead of square nuts.

The advantage of the present invention is therefore that the tool set according to the invention provides an improved tool which, due to its

special design offers particular ease of use. In particular, the tool set according to the invention provides a special tool that is optimally adapted to the needs of pipeline construction. The special design of the tool set eliminates the need for additional tool attachments that are otherwise often superfluous and are not even needed in most cases. This eliminates the unnecessary weight that would normally be carried during assembly work. The fact that the tool set can be dismantled also makes the tool ideal for transport, as it can be stored in any tool case.

Short description of the drawings

For better understanding and further explanation, an embodiment of the present invention is described in more detail below with reference to the accompanying drawings.

Fig. 1 shows the tool set in the assembled state;

Fig. 2 shows the two-armed tool ratchet with the lever arms removed;

Fig. 3 shows the tool ratchet with attached lever arms;

Fig. 4 shows the extension with the drop nut pushed over the first tool nut;

Fig. 5 shows the extension with the drop nut pushed back;

Fig. 6a-6c shows the individual parts of the extension including the corresponding drop nut.

Throughout the figures, identical parts are identified by identical reference numerals.

Description of exemplary embodiments of the invention

Fig. 1 shows the tool set 15 in the assembled state. The tool set is composed of a two-armed tool ratchet 1 and an extension 20 with a drop nut 21 pushed onto it. The two-armed tool ratchet 1 in turn comprises the ratchet body 2 with shafts attached to it (not shown here, however).

shown), onto which the first lever arm 3 and the second lever arm 4 are attached. For convenient manual operation, the first lever arm 3 has a first handle 7 and the second lever arm 4 has a second handle 8. The extension 20 is attached to the drive shaft (not shown here) of the ratchet mechanism located in the ratchet body 2 by means of the first sleeve 25.

The extension 20 consists of the first rod section 22 and the second rod section 23, which are connected to one another via the second sleeve 26. The second rod section 23 has a first tool nut 24 at the end opposite the second sleeve 26, whereby, as shown here, the first tool nut 24 and the second rod section 23 are formed in one piece. A second tool nut, referred to here as a drop nut 21, is pushed onto the second rod section 23. The drop nut 21 can be moved in the longitudinal direction of the second rod section, as indicated here by the arrows.

As shown in Fig. 1, the extension 20 consists of the first rod section 22 and the second rod section 23. Of course, the extension can also consist of only one rod section or more than two rod sections.

Fig. 2 shows the ratchet body 2 of the two-armed tool ratchet 1 with the lever arms 3, 4 removed. The ratchet body 2 accommodates a generally known ratchet mechanism in its interior. Of this ratchet mechanism, only the drive shaft 9 is visible outside the ratchet body 2, onto which, as is known from the prior art, different tool sets can be plugged. On its circumference, the ratchet body 2 has a first shaft 5 and a second shaft 6, which are essentially opposite each other and separated by the ratchet body 2. The first lever arm 3 can be plugged onto the first shaft 5 and the second lever arm 4 onto the second shaft 6. The shafts 5, 6 are very short in comparison to the lever arms 3, 4 and are

not suitable for manual operation. For this purpose, the two lever arms 3, 4 each have cylindrical recesses 10 at the ends facing the shafts 5, 6, which are matched to the diameters of the two shafts 5, 6, so that the lever arms 3, 4 can be positively attached to the shafts 5, 6. On the end of the lever arms 3, 4 opposite the recess 10 there are handles 7, 8, which serve to make the two-armed tool ratchet more comfortable to operate manually.

The two-armed tool ratchet 1, comprising the ratchet body 2 and the two lever arms 3, 4, consists essentially of steel, preferably cast steel. High-quality tempered C45 steel has proven to be a particularly suitable material for the manufacture of such a tool ratchet 1. It is also conceivable to manufacture the individual parts of the two-armed tool ratchet 1 from plastic, for example from a glass fiber reinforced plastic such as fiberglass.

Fig. 3 essentially shows the two-armed tool ratchet of Fig. 2, but with lever arms 3, 4 attached to the shafts 5, 6 of the ratchet body 2. To prevent the lever arms 3, 4 from accidentally slipping off the shafts 5, 6, the lever arms 3, 4 are locked to the shafts 5, 6 using suitable means (not shown here). Suitable means for this include, for example, locking mechanisms that secure the lever arms 3, 4 against accidentally slipping. Another suitable means for preventing the lever arms 3, 4 from accidentally slipping is to screw the lever arms 3, 4 onto the shafts 5, 6.

Fig. 4 shows the extension 20 with partial sections. The extension 20 comprises the first rod section 22 and the second rod section 23. The first rod section 22 is provided at the end facing away from the second rod section with a first sleeve 25, with which the extension 20 can be plugged onto the drive shaft 9 of the two-armed tool ratchet 1. At the opposite end of the first

The first rod section 22 has a second sleeve 26 into which the second rod section 23 is inserted. In order to ensure a rotationally locking connection between the first and the second rod section 22, 23, the inner contour of the second sleeve 26 is matched to the outer contour of the section of the second rod section 23 that is inserted into the second sleeve 26.

At the end of the second rod section 23 opposite the first sleeve 25 of the extension 20 there is a first tool nut 24 which in the present embodiment is formed in one piece with the second rod section 23. On the second rod section 23, the first tool nut 24 is arranged so as to surround a second tool nut, the drop nut 21, which is displaceable in the longitudinal direction of the second rod section 23.

In the position shown here, the drop nut 21 is pushed over the first tool nut 24. In this position, the extension 20 in conjunction with the two-armed tool ratchet 1 is suitable for operating the drop nut 21, for example to operate the slide valve of an underground hydrant. To ensure that torque is transmitted from the two-armed tool ratchet 1 to the drop nut 21, all parts of the extension 20 are positively connected to one another. For this purpose, the drop nut 21 in particular has an inner contour that corresponds to the outer contour of the first tool nut. To ensure that the drop nut 21 cannot slip off the first tool nut 24 in the position shown here, the drop nut 21 can be locked to the first tool nut, for example by means of a screw (not shown) screwed into the locking opening 28 or by means of a locking pin.

Fig. 5 essentially shows the extension 20 of Fig. 4, but here with the drop nut 21 removed from the first tool nut 24. The drop nut 21 is pushed back onto the extension rod of the second rod section 23 as shown here. In this

position, the first tool nut 24 is exposed. In this position, the extension is used to transfer a torque to the first tool nut 24 and thus, for example, to operate a slide valve of a house connection, the actuating device of which is significantly smaller than that of a large slide valve, as found in above-ground or underground hydrants. So that the drop nut 21 remains in the position shown here and cannot slide back over the first tool nut 24, the drop nut 21 can be locked to the second rod section 23 using the same securing means as already described in Fig. 4.

Fig. 6a shows the first rod section 22 of the extension 20. The first rod section 22 has a sleeve 25, 26 at each of its two ends. The sleeve 25 is designed in such a way that the first rod section 22 can be plugged onto the drive shaft of a tool ratchet. The second sleeve 26 is designed in such a way that the second rod section 23 can be plugged into it in order to be connected to it in a rotationally locked manner.

Fig. 6b shows the second rod section 23, which is designed at one end as one piece with the first tool nut 24. At the end opposite the first tool nut 24, the second rod section 23 has an outer contour that corresponds to the inner contour of the second sleeve 26 of the first rod section 22 in order to be connected to the first rod section 22 in a rotationally locking manner. The socket wrench formed by the first tool nut 24 is a square socket wrench and preferably has an opening with a size of 15 mm, which tapers conically to 10 mm. Of course, the first tool nut 24 can also be designed as a hexagon wrench. The first tool nut 24 can of course also have a size other than 15 mm.

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Fig. 6c shows the drop nut 21 in a longitudinal section. The inner contour 27 of the drop nut 21 is matched to the outer contour of the first tool nut 24 in such a way that, as shown in Fig. 4, the drop nut 21 is positively connected to the first tool nut 24 of the second rod section 23. The inner contour 27 is preferably designed as a square. The positive connection of the drop nut 21 with the second rod 23 can of course also be achieved by other means. The drop nut 21 can also be positively connected directly to the second rod 23.

The socket wrench formed by the drop nut 21 is a square socket wrench and preferably has an opening of 32 mm in size, which tapers conically to 24 mm. Of course, the drop nut can also be designed as a hexagon wrench. The drop nut 21 can of course also have a size other than 32 mm.

As already explained, the extension 20 does not necessarily have to be composed of the two rod sections 22 and 23. However, the two-part extension 20 described here has the advantage that the two-part design makes the extension 20 easier to transport when disassembled. However, the extension 20 can also consist of three or more rod sections or can be reduced to just one rod section.

The extension 20 and the drop nut 21 are made of steel, preferably cast steel. It is particularly advantageous to manufacture the parts from high-quality tempered C45 steel.

Claims (36)

1. Tool ratchet ( 1 ) with a ratchet body ( 2 ) which accommodates a ratchet mechanism with a drive shaft ( 9 ) for coupling to a tool attachment, and at least two lever arms ( 3 , 4 ) detachably attached to the ratchet body ( 2 ) which are essentially opposite one another and separated by the ratchet body ( 2 ). 2. Tool ratchet according to claim 1, characterized in that the lever arms ( 3 , 4 ) are arranged at an angle which is greater than 120°. 3. Tool ratchet according to claim 2, characterized in that the lever arms ( 3 , 4 ) are arranged at an angle of 180°. 4. Tool ratchet according to one of the preceding claims, characterized in that the ratchet body ( 2 ) has at its circumference at least two shafts ( 5 , 6 ) which are suitable for detachable connection to the lever arms ( 3 , 4 ). 5. Tool ratchet according to claim 4, characterized in that the shafts ( 5 , 6 ) are very short in relation to the lever arms ( 3 , 4 ). 6. Tool ratchet according to claim 4 or 5, characterized in that the lever arms ( 3 , 4 ) can be plugged onto the shafts ( 5 , 6 ). 7. Tool ratchet according to claim 4 or 5, characterized in that the lever arms ( 3 , 4 ) can be inserted into the shafts ( 5 , 6 ) like a sleeve. 8. Tool ratchet according to claim 4 or 5, characterized in that the lever arms ( 3 , 4 ) and the shafts can be screwed together. 9. Tool ratchet according to claim 4, 5, 6 or 7, characterized in that the lever arms ( 3 , 4 ) are positively connected in a rotationally fixed manner to the shafts ( 5 , 6 ). 10. Tool ratchet according to one of claims 4 to 9, characterized in that the lever arms ( 3 , 4 ) are each releasably locked to the shafts ( 5 , 6 ) by means of a securing device. 11. Tool ratchet according to claim 10, characterized in that the securing device is a ball which is spring-mounted in either the lever arms ( 3 , 4 ) or the shafts ( 5 , 6 ) and which snaps positively into a recess in the respective other part. 12. Tool ratchet according to claim 10, characterized in that the securing device is a locking pin which is spring-mounted in the shafts ( 5 , 6 ) and snaps into an opening in the lever arms ( 3 , 4 ). 13. Tool ratchet according to claim 10, characterized in that the securing device is a screw. 14. Tool ratchet according to one of the preceding claims, characterized in that the ratchet body ( 2 ) and/or the lever arms ( 3 , 4 ) are made of cast steel, in particular of high-quality tempered C45 steel or of chrome-vanadium steel. 15. Tool ratchet according to one of claims 1 to 13, characterized in that the ratchet body ( 2 ) and/or the lever arms ( 3 , 4 ) are made of plastic, in particular of fiberglass. 16. Extension ( 20 ) which can be plugged onto the drive shaft ( 9 ) of a tool ratchet, having a rod section ( 22 , 23 ), a first tool nut ( 24 ) and at least one second tool nut ( 21 ) which is arranged displaceably on the rod section ( 22 , 23 ) such that alternatively the first or the second tool nut ( 24 , 21 ) can be brought into an actuating position for torque transmission. 17. Extension according to claim 16, characterized in that the second tool nut ( 21 ) can be pushed over the first tool nut ( 24 ). 18. Extension according to claim 17, characterized in that the second tool nut ( 21 ) is connected in a rotationally fixed manner to the extension ( 20 ) or the first tool nut ( 24 ) in the position pushed over the first tool nut ( 24 ) for torque transmission. 19. Extension according to one of claims 16 to 18, characterized in that the second tool nut ( 21 ) has means by which it is connected to the extension ( 20 ) or the first tool nut ( 24 ). 20. Extension according to claim 19, characterized in that the second tool nut ( 21 ) has an inner contour ( 27 ) which is designed such that it is positively connected to the extension ( 20 ) or the first tool nut ( 24 ) for torque transmission. 21. Extension according to claim 16, characterized in that the extension ( 20 ) has means with which the second tool nut ( 21 ) can be locked on the extension ( 20 ) in the position pushed over the first tool nut ( 24 ) as well as in the position pulled away therefrom. 22. Extension according to claim 21, characterized in that the means is a locking pin which is spring-mounted in the extension ( 20 ) and which snaps into a locking opening ( 28 ) in the second tool nut ( 21 ). 23. Extension according to one of claims 16 to 22, characterized in that the extension ( 20 ), the first tool nut ( 24 ) and the second tool nut ( 21 ) are each individually joinable parts. 24. Extension according to claim 16 to 23, characterized in that the extension ( 20 ) comprises at least a first rod section ( 22 ) and a second rod section ( 23 ). 25. Extension according to one of claims 16 to 24, characterized in that the attachable extension ( 20 ), the first tool nut ( 24 ) and the second tool nut ( 21 ) are made of steel, in particular of cast steel. 26. Extension according to one of claims 25, characterized in that the attachable extension ( 20 ), the first tool nut ( 24 ) and the second tool nut ( 21 ) are made of high-quality tempered C45 steel or of chrome-vanadium steel. 27. Extension according to one of claims 16 to 26, characterized in that the first tool nut ( 24 ) and the second tool nut ( 21 ) are square nuts. 28. Extension according to claim 27, characterized in that the first tool nut ( 24 ) has an opening of size 15 mm and the second tool nut ( 21 ) has an opening of size 32 mm. 29. Extension according to claim 28, characterized in that the opening of the first tool nut tapers to 10 mm and the opening of the second tool nut tapers to 24 mm. 30. Extension according to one of claims 16 to 26, characterized in that the second tool nut ( 21 ) and/or the first tool nut ( 24 ) is a hexagon nut. 31. Extension according to claim 30, characterized in that the second tool socket ( 21 ) is a 70 mm socket. 32. Tool set comprising a tool ratchet ( 1 ) according to one of claims 1 to 15 and an extension according to one of claims 16 to 31. 33. Tool set according to claim 32, characterized in that the extension ( 20 ) is firmly connected to the drive shaft ( 9 ) of the tool ratchet ( 1 ). 34. Tool set according to claim 32, characterized in that the extension ( 20 ) can be detachably attached to the drive shaft ( 9 ) of the tool ratchet ( 1 ). 35. Tool set according to claim 34, characterized in that the drive shaft ( 9 ) has a securing device by means of which the extension ( 20 ) is releasably attached to the drive shaft ( 9 ). 36. Tool set according to claim 35, characterized in that the securing device is a ball which is spring-mounted in the drive shaft ( 9 ) and which, when the extension ( 20 ) is plugged on, snaps positively into a recess arranged in the interior of the sleeve ( 25 ) of the extension ( 20 ).