EP3209440B1 - Pressing tool - Google Patents

Description

The invention relates to a pressing tool and a method for radial pressing of workpieces, in particular of pipes and / or press fittings on pipes.

From the WO 2011/06778 A1 , which forms the basis for the preambles of claims 1 and 2, a pressing tool is known which has a pressing sling made of pressing elements coupled to one another in hinge joints, with pressing jaws being movably mounted on the inside of the pressing elements. By pulling the press sling together, the press jaws are moved radially inward and thus cause a corresponding pressing of a pipe around which the tool is wrapped. Against this background, it was the object of the present invention to provide a pressing tool with which a particularly uniform radial pressing of workpieces such as pipes is possible. This object is achieved by a pressing tool according to claim 1 and by a method according to claim 2. Advantageous refinements are contained in the subclaims.

• Einen Ring aus Ringsegmenten, wobei der Ring Kopplungsstellen aufweist, über welche jeweils eine das Schließen des Ringes bewirkende Zugkraft in den Ring eingeleitet werden kann. Typischerweise ist der Ring zwischen zwei Kopplungsstellen offen (alternativ könnte er auch geschlossen sein, wenn dadurch ein weiteres Schließen des Ringes - d.h. eine Umfangsverringerung - möglich bliebe). Bei einem offenen Ring befinden sich die Kopplungsstellen typischerweise an den Ringenden.
• Mindestens eine an einem Ringsegment beweglich (gegenüber dem Ringsegment) gelagerte Pressbacke, welche im Folgenden zur Unterscheidung von ggf. vorhandenen weiteren Pressbacken auch als "(erste) Zug-Pressbacke" bezeichnet wird. Die Zug-Pressbacke liegt an der Innenseite des Ringsegmentes bzw. ist dort gelagert. Die Zug-Pressbacke ist eine Komponente, welche beim Pressvorgang unmittelbar mit dem Werkstück in Kontakt kommt. Die Zug-Pressbacke weist daher typischerweise an ihrer Innenseite diejenigen Kontur auf, welche dem Werkstück eingeprägt werden soll.

As explained at the outset, a pressing tool according to the present invention is used for the radial pressing of workpieces, for example fittings on pipes. The press tool contains the following components:

• A ring made of ring segments, the ring having coupling points via which a tensile force causing the ring to close can be introduced into the ring. Typically, the ring is open between two coupling points (alternatively, it could also be closed if this would allow further closing of the ring - ie a reduction in circumference). In the case of an open ring, the coupling points are typically at the ring ends.
• At least one press jaw movably mounted on a ring segment (with respect to the ring segment), which in the following is also referred to as "(first) pull-press jaw" to distinguish it from any other press jaws that may be present. The tension press jaw lies on the inside of the ring segment or is mounted there. The pull-press jaw is a component that comes into direct contact with the workpiece during the pressing process. The tension press jaw therefore typically has on its inside that contour which is to be impressed on the workpiece.

The pressing tool is further characterized in that the ring contains a partial ring which consists of one or more ring segments which are coupled to one another to transmit tensile force, one end of the partial ring also being coupled to the first tensile force transmitting jaw. To distinguish any further partial rings that may be present, the partial ring is also referred to below as the “first partial ring”.

Furthermore, the pressing tool contains a second partial ring made of ring segments coupled to transmit tensile force.

A tensile force-transmitting chain is produced via the first partial ring from a first end of the partial ring to the tension press jaw. Typically, one of the above-mentioned coupling points is arranged at the first end of the partial ring, via which a tensile force causing the ring to close is introduced into the entire ring. Such a tensile force can be generated, for example, by an external tool (so-called “pressing tongs”). In contrast to the known pressing tools, the tensile force for closing the ring is not transferred in a closed circle from one ring segment to the next, but via the partial ring directly to the tension pressing jaw. In practice it turns out that in this way the pressing forces to be applied can be reduced and that a better pressing result can be achieved through a uniform radial inward movement of the pressing jaws.

In connection with the present application, a general device should preferably be viewed as "tensile force-transmitting" if it has a first point for the application of a (tensile) force and a second point for the transmission of the (possibly according to size and / or direction converted) tensile force, a (small) movement of the first point in the direction of the tensile force inevitably entails a corresponding movement of the second point. In other words, the (tensile) force introduced at the first point can always be compensated for by a suitable counter (tensile) force introduced at the second point, so that the first point (initially) does not move in the direction of the (tensile) introduced Power moves.

In an alternative formulation, two elements (e.g. two ring segments or one ring segment and the tension-pressing jaw) can be described as "coupled in a manner that transmits tensile force" if the tensile force (initially) does not result in any relative displacement between the elements (at most a rolling motion).

"Transmission of tensile force" is, for example, a tensioned chain or a tensioned wire rope (but not a rolled up, loose chain with play in the chain links).

In the narrower sense, in the case of pressing tools that are designed for machining essentially round workpieces such as pipes, fittings or the like, a "tensile force" can also be defined in that it runs essentially tangentially with respect to the center point of a workpiece to be machined (or, in other words, perpendicular to the local direction of the pressing force). A force which is transmitted from one ring segment to another (or to the tension press jaw) and which is more than 50%, more than 75%, more than 80%, more than 85%, or preferably more than 90% runs in the direction of the tangent at the point of transmission of the force, would therefore be a "pulling force". Other forces acting on the ring segments and / or press jaws, on the other hand, are typically essentially radial with respect to the center of the workpiece.

The invention further relates to a corresponding method for the radial pressing of workpieces, wherein the method can be carried out in particular with a pressing tool of the type described above. The method comprises the introduction of a tensile force in coupling points of a ring made of ring segments in order to effect the closing (circumference reduction) of the ring, said tensile force being transmitted via a first partial ring made of tensile force-transmitting ring segments to a first tension press jaw, which is movably attached to is mounted on a ring segment.

In the following, various preferred embodiments of the invention are explained in more detail, which can be implemented both in connection with the pressing tool and with the method, even if they are possibly only explained for the tool or the method.

The first tension press jaw is usually mounted on a ring segment that does not belong to the first partial ring. The transmission of the tensile force can be continued via the connection of the tension press jaw to the ring segment that carries it.

According to a preferred embodiment of the invention, there is a second partial ring made of (one or more) tensile force-transmitting ring segments, one end of which is tensile force-transmitting coupled to a second tensile pressing jaw, which is movably mounted on a ring segment (preferably on its inside) . The ring segments that make up the second partial ring are typically different from those of the first partial ring. Likewise, the first and the second tension press jaws are usually mounted differently and also on different ring segments. Preferably, all ring segments of the pressing tool are either part of the first partial ring or of the second partial ring. Furthermore, there is preferably a coupling point for introducing an external tensile force on the first partial ring and another on the second partial ring.

In the general case, the first and the second partial ring can be constructed structurally different, z. B. by consisting of different numbers of ring segments. According to a preferred embodiment, however, the second partial ring is constructed essentially symmetrically to the first partial ring. The "symmetry" can be on an abstract, functional level (i.e. both partial rings contain corresponding numbers of ring segments with correspondingly arranged press jaws). Likewise, the symmetry can also be geometric in the narrower sense (in particular as a mirror symmetry to a center plane). On the one hand, the symmetry achieves a more uniform effect of the tool. On the other hand, the production costs can be reduced by using identical or symmetrical components. Insofar as embodiments of the invention are described in the present text with reference to "the partial ring" and / or "the pull-press jaw", these apply equally optionally to the first partial ring or the first pull-press jaw as well as to the second partial ring or the second pull press jaw.

In the case of a pressing tool with two partial rings, the first tension-pressing jaw is preferably movably supported on a terminal (proximal) ring segment of the second partial ring. The first tension-pressing jaw thus represents a connection between the ring segments of the first and the second partial ring. As explained above, the second tension-pressing jaw can additionally or alternatively be mounted on an end ring segment of the first partial ring.

In another embodiment of the invention, terminal ring segments of the first partial ring and the second partial ring can be coupled to one another via a link. This means that direct force transmissions between these ring segments and thus between the partial rings are possible, although certain directions of force are excluded from the transmission due to the mobility corresponding to the link (since there is freedom of movement in these directions). Typically, these are directions primarily pointing in the circumferential direction, in which tensile force would be transmitted.

At least two ring segments of the pressing tool can optionally be coupled to one another via a hinge joint (swivel joint). All ring segments that belong to the first partial ring (and / or all of the ring segments that belong to the second partial ring) are preferably coupled to one another via a hinge joint. A tensile force can be transmitted in full via a hinge joint.

Additionally or alternatively, the first partial ring can be coupled in a hinge joint (swivel joint) to the first pull-press jaw (and / or the second partial ring to the second pull-press jaw). Here, too, it is true that a rotation between the corresponding ring segment of the partial ring and the tension press jaw is possible, but that the tensile force is completely transmitted.

In an alternative embodiment, the first partial ring can be coupled to the first tension / press jaw in a joint that allows a rolling and / or sliding movement perpendicular to the respective direction of the tensile force acting there (and / or, analogously, the second partial ring to the second train Press jaw). The freedom of movement gained in this way can be used to enable a uniform, radially inward migration of the pull-press jaw.

According to a further embodiment of the invention, at least one press jaw is movably arranged on each ring segment (preferably on the respective inner sides). The mobility of at least one press jaw (including the tension press jaw (s)) with respect to the associated ring segment can in particular be a displacement movement in the circumferential direction (in relation to a circular workpiece to be machined). Due to the mobility of the pressing jaws, they can adjust themselves on a workpiece independently of the ring segments and, in particular, ensure uniform pressing by maintaining uniform distances from one another.

In general, the movable pressing jaws of the pressing tool are preferably mounted in such a way that they have or maintain essentially the same distance from one another before and / or during a pressing process (ie the same size gaps in the circumferential direction). This is usually synonymous so that each individual press jaw moves in a straight line radially inwards towards the center of the workpiece to be pressed. Since the movement of the pressing jaws during a pressing process usually also depends on the workpiece being processed, e.g. on the surface properties of a fitting, the above condition ideally relates to the case of a workpiece that is the same for all pressing jaws, in particular a workpiece with a surface made of stainless steel.

The pressing jaws of the pressing tool can in particular be mounted on a circumferential sliding surface (which is usually located on an associated ring segment) so that they can move (only) in the circumferential direction (relative to the ring segment).

Additionally or alternatively, the movement of the pressing jaws of the pressing tool can be limited to a specific area by at least one stop and / or a guide link.

Furthermore, at least one spring element can additionally or alternatively be present, which presses a movable press jaw of the press tool in a predetermined direction. The spring element can preferably press the press jaw against a stop into a predefined position before the start of a pressing process, if the press jaw is not yet influenced by the friction with the workpiece. This position can be distinguished in particular by the fact that all press jaws are at the same distance from one another.

In another development of the invention, the pressing tool contains a holding device by means of which a first ring segment can be held (stabilized) at at least one defined angle with respect to an adjoining second ring segment. The holding device is preferably designed to hold the ring segments alternatively at two defined angular positions. The held angular positions can in particular include an open position in which the ring of the pressing tool is open and can thus be placed around a workpiece. Furthermore, a The closed position is held, which is assumed when the pressing tool has been placed around a work piece (loosely).

The aforementioned holding device can be implemented in various ways. It can, for example, comprise a spring-loaded pin which is mounted on a ring segment and against which a cam of an adjacent ring segment presses. The positions of the cam "left" and "right" of the pin can be stabilized in this way.

The introduction of a tensile force into the ring of the pressing tool is possible in various ways. In particular, the coupling points can be set up in this regard for the attachment of locking pliers, the jaws of the locking pliers being able to pull the ends of the ring together with the introduction of tensile forces.

Fig. 1

eine Prinzipskizze eines Presswerkzeuges gemäß der vorliegenden Erfindung;

Fig. 2

eine Draufsicht (Mitte), eine Ansicht von oben (oben), eine Ansicht von unten (unten), und eine Seitenansicht (rechts) einer konkreten Ausführungsform eines erfindungsgemäßen Presswerkzeuges im aufgeklappten Zustand;

Fig. 3

eine perspektivische Ansicht des Presswerkzeuges von Figur 2;

Fig. 4

einen Schnitt entlang der Linie IV-IV von Figur 2;

Fig. 5

eine perspektivische Ansicht des Presswerkzeuges im geschlossenen Zustand vor einer Pressung;

Fig. 6

eine Draufsicht des Presswerkzeuges von Figur 5;

Fig. 7

eine Seitenansicht des Presswerkzeuges von Figur 5;

Fig. 8

einen Schnitt entlang der Ebene VIII-VIII von Figur 7;

Fig. 9

einen Schnitt entlang der Ebene IX-IX von Figur 7;

Fig. 10

eine perspektivische Ansicht des Presswerkzeuges im geschlossenen Zustand nach Abschluss einer Pressung;

Fig. 11

eine Draufsicht des Presswerkzeuges von Figur 10;

Fig. 12

eine Seitenansicht des Presswerkzeuges von Figur 10;

Fig. 13

einen Schnitt entlang der Ebene XIII-XIII von Figur 12;

Fig. 14

einen Schnitt entlang der Ebene XIV-XIV von Figur 12;

Fig. 15

ein distales Ringsegment;

Fig. 16

ein proximales Ringsegment;

Fig. 17

eine distales Pressbacke;

Fig. 18

eine Zug-Pressbacke;

Fig. 19

eine Schließzange im geöffneten Zustand;

Fig. 20

die Schließzange im geschlossenen Zustand.

In the following, the invention is explained in more detail by way of example with the aid of the figures. It shows:

Fig. 1

a schematic diagram of a pressing tool according to the present invention;

Fig. 2

a top view (middle), a view from above (above), a view from below (below), and a side view (right) of a specific embodiment of a pressing tool according to the invention in the unfolded state;

Fig. 3

a perspective view of the press tool of Figure 2 ;

Fig. 4

a section along the line IV-IV of Figure 2 ;

Fig. 5

a perspective view of the pressing tool in the closed state before pressing;

Fig. 6

a top view of the press tool of Figure 5 ;

Fig. 7

a side view of the press tool of Figure 5 ;

Fig. 8

a section along the plane VIII-VIII of Figure 7 ;

Fig. 9

a section along the plane IX-IX of Figure 7 ;

Fig. 10

a perspective view of the pressing tool in the closed state after completion of a pressing;

Fig. 11

a top view of the press tool of Figure 10 ;

Fig. 12

a side view of the press tool of Figure 10 ;

Fig. 13

a section along the plane XIII-XIII of Figure 12 ;

Fig. 14

a section along the plane XIV-XIV of Figure 12 ;

Fig. 15

a distal ring segment;

Fig. 16

a proximal ring segment;

Fig. 17

a distal press jaw;

Fig. 18

a pull press jaw;

Fig. 19

a locking tong in the open state;

Fig. 20

the locking pliers in the closed state.

The embodiments of pressing tools described below are used for the radial pressing of workpieces such as, for example, fittings on pipes or pipe connections.

Figure 1 shows in this regard schematically a pressing tool 1 which is designed according to the present invention. The tool 1 has several (in the example shown four) pressing jaws 11, 12, 11 ', 12' which can be arranged around a workpiece (not shown) to be machined and come into direct contact with it during the pressing process.

Furthermore, there is a ring 20, 20 '(also called a press chain or press sling) which loops around the outside of the press jaws and two at its ends Has coupling points K, K 'at which a tensile force F, F' can be introduced (for example by means of pressing tongs according to FIG Figure 19, 20 ). In the prior art, the ring is designed in such a way that it can continuously transmit tensile force from one coupling point K to the other (K '), for example by consisting of segments which are all connected to one another via swivel joints.

The tensile force is passed on and deflected along the ring 20, 20 '. It runs essentially in the circumferential direction at every location, i.e. tangentially in relation to the center of the workpiece to be machined.

By introducing a tensile force at the ends of the open ring, it is closed, and the resulting reduction in circumference on its inside pushes the press jaws 11, 12, 11 ', 12' movably mounted there radially inward, which in turn causes the desired deformation of the workpiece .

For a good pressing result, it is important that the radial inward movement of the pressing jaws takes place as evenly as possible, for example by always keeping the pressing jaws the same distance from one another. However, due to different material pairings and friction, this condition is difficult to meet in practice. In order to reduce this problem and to improve the evenness of the pressing result, it is proposed according to the invention in this regard to deviate from a continuous chain of ring segments. Instead, a first partial ring 20 is provided in the ring, which runs from a first coupling point K to a point of application R on a pressing jaw 12 ', which is referred to below as the “first tension-pressing jaw”.

The in Figure 1 The first partial ring 20, indicated only schematically as a line, typically consists of ring segments that are rotatably coupled to one another. The tensile force F introduced at the coupling point K is passed on (and deflected) along the first partial ring 20 and finally transmitted to the first tensile pressing jaw 12 ′ at the point of application R. In other words, according to the invention, a tensile force is not completely closed around everyone Press jaws passed around, but only partially passed around some press jaws and directly introduced into another press jaw (the "pull-press jaw"). This (pull) press jaw is typically mounted on a ring segment that does not belong to the pulling partial ring 20. It has been shown that a more uniform pressing can be achieved in this way, in which, in addition, lower frictional forces occur.

The in Figure 1 There is also a second partial ring 20 ', which is functionally and geometrically mirror-inverted to the first partial ring 20 (ie that it runs from the second coupling point K' to a second "pull-press jaw" 12, to which it pulls -transferring coupled).

The first press-pull jaw 12 'is mounted on the inside of the second partial ring 20' (typically it is movably mounted on one of the ring segments of the second partial ring 20 '), while the second press-pull jaw 12 is on the inside of the first partial ring 20 ( typically also displaceable on one of the ring segments of the first partial ring 20). This causes the two partial rings 20, 20 'to overlap or interleave. In particular, the first tension press jaw 12 ', on which a tensile force is exerted by the first partial ring 20, is pressed radially inward by the second partial ring 20' (and thus prevented from simply yielding to the tensile force). Conversely, the second tension press jaw 12 is pressed radially inward by the first partial ring 20 and is thus held in place. The entanglement of the partial rings 20, 20 'thus prevents the pressing tool from falling apart.

In the Figures 2 to 18 shows a pressing tool 100 according to a specific embodiment of the principle generally explained above.

The Figures 2-4 show different views of the pressing tool 100 in its open position, in which it can be placed around a pipe (not shown) or the like.

The pressing tool 100 contains a first partial ring 120 with a distal ring segment 121 and a proximal ring segment 122, which are coupled to one another by a hinge joint G1. Furthermore, the first partial ring 120 contains on its terminal, distal ring segment 121 a coupling point K (e.g. a bolt) on which a jaw of a pressing tong ( Figures 19, 20 ) can attack and initiate a tensile force. Press jaws 111, 112 are each mounted on the inner sides of the ring segments 121, 122 in a displaceable manner.

The pressing tool 100 also contains a second partial ring 120 ′, which is constructed in a mirror image of the first partial ring 120, with corresponding parts having the same reference numerals provided with dashes.

From the sectional view of Figure 4 it can be seen that the proximal ring segment 122 'of the second partial ring 120' couples tensile force-transmitting via a joint G2 to the second tension press jaw 112 (which in turn is movably mounted on the proximal ring segment 122 of the first partial ring 120).

There is no direct tensile force-transmitting coupling between the proximal ring segment 122 of the first partial ring 120 and the proximal ring segment 122 'of the second partial ring 120'. Figure 4 rather shows that, for example, a bolt connected to the proximal ring segment 122 of the first partial ring 120 in the joint G2 'engages through an elongated hole L' of the proximal ring segment 122 'of the second partial ring 120', the size and orientation of the elongated hole L 'being such that During a typical pressing process, no direct force transmission takes place between the two partial rings 120, 120 '(at least no force transmission with a substantial tangential component in the circumferential direction).

In Figure 4 two holding devices can also be seen, via which a distal ring segment 121 (or 121 ') in relation to the adjacent proximal ring segment 122 (or 122') in the open position ( Figure 4 ) or in a closed position ( Figure 9 ) is kept stable. The holding devices are each formed symmetrically on the first partial ring 120 and second partial ring 120 '.

The holding device on the first partial ring 120 consists essentially of a spring pin 125 which is mounted in a bore in the proximal ring segment 122 and is pressed outwardly out of the bore by the force of a spring (not shown). The spring pin 125 presses with its round head against a protruding cam or nose of the distal ring segment 121 and is thus retained in the bore. Depending on whether the spring pin 125 comes to lie “left” or “right” of the tip of the cam, its pressure stabilizes the open position or the closed position of the distal ring segment 121. One and the same mechanism is thus used to lock two different working positions of the pressing tool 100 (reversible), which accordingly facilitates the use of the tool.

In the Figures 5-9 the pressing tool 100 is shown in a loosely closed position which it assumes after it has been placed around a workpiece that has not yet been pressed. According to Figure 6 the construction of the tool is such that between the four pressing jaws 111, 112, 111 ', 112' there are as large as possible the same distances Δ. This is achieved, inter alia, in that the pressing jaws 111, 112 or 111 ', 112' are pressed by springs (not shown) in the direction of the coupling points K and K '.

Ideally, the condition of equally large distances should also be met during the subsequent pressing process. To make this possible, the second tension press jaw 112 can be coupled to the bolt via elongated holes or expanded round holes 112b, which forms the joint G2 and which is rotatably coupled to the proximal ring segment 122 'in a round hole (cf. Figure 4 ). The shape of the hole 112b is chosen so that the bolt of the joint G2 is essentially always perpendicular to the edge of the hole during the pressing process and can thus transmit tensile force without a relative displacement movement between the tension press jaw 112 and the ring segment 122 ' while at the same time one for geometric reasons necessary migration of the bolt in hole 112b is possible. In the completely closed state of the pressing tool 100, the bolt is then at the other end of the elongated hole 112b (cf. Figure 11 ). Of course, a similar effect could also be achieved by a round hole on the tension press jaw 112 in conjunction with an elongated hole on the ring segment 122 'and / or by a non-round bolt. An analogous structure is also present for the joint between the first tension press jaw 112 ′ and the ring segment 122.

In Figure 8 the direction of pressure of the springs mentioned above is indicated by arrows. It can also be seen that the pressing jaws have links 111a, 112a through which a pin of the associated ring segment 121 or 122 engages. This creates a stop which stops the further movement of the pressing jaws in the direction of the arrow and ensures that the even distances Δ are present at the start of the pressing process. During a pressing process, the pressing jaws move along circumferential sliding surfaces that are formed on the associated ring segments. As explained, this movement is preferably such that the distances Δ between the pressing jaws always remain the same. This is achieved not least by a suitable shape of the elongated holes L, L 'in the proximal ring segments 122, 122', by means of which the possibilities of movement of these ring segments are also determined.

The pressing process is carried out using pressing tongs ( Figure 19, 20 ) or the like is applied to the coupling points K, K 'and tensile forces F, F' exert on them, which lead to a closure of the ring.

The Figures 10-14 show the pressing tool 100 after completion of such a pressing process. This conclusion is reached when the distances between the pressing jaws 111, 112, 111 ', 112' have shrunk to zero, so that no further radial inward movement is possible. The pressing tongs (not shown) can then be removed and the pressing tool 100 opened and removed from the workpiece.

The Figures 15-18 show perspective views of the ring segments or pressing jaws from which the pressing tool 100 according to the invention is assembled. A symmetrical structure makes it possible to assemble the first partial ring and the second partial ring from components of the same type, which reduces the manufacturing costs accordingly.

Figure 19 shows an example of pressing tongs Z which can be used to close the ring of the pressing tool 100. The open position is shown, in which the jaws 151, which are to be attached to the coupling points K, K ', are far apart. When a, for example, hydraulically driven punch (not shown) is placed on the lower end of the pressing tongs Z and pushes their arms apart, the jaws 151 move towards one another. The pressing tongs Z with the jaws 151 in a closed position is shown in FIG Figure 20 shown.

The embodiments of the invention shown in the figures can be modified in many ways. For example, the illustrated two press jaws in each ring half (i.e. the press jaws 11, 12 or 11 ', 12' or 111, 112 or 111 ', 112') could also be connected to form a single half-ring-shaped press jaw.

Claims (9)

1. Pressing tool (1, 100) for radial pressing of workpieces, comprising:

   - a ring of ring segments (121, 122, 121', 122') with coupling points (K, K') for introducing a traction (F, F') causing the ring to close;

   - at least one first traction press jaw (12', 112') movably mounted on the inside of a ring segment (122');

   characterized in that

   - a first partial ring (20, 120) of traction-transmitting coupled ring segments (121, 122) is provided, one end of which is traction-transmitting coupled to the first traction press jaw (12', 112'),

   - a second partial ring (20', 120') of traction-transmitting coupled ring segments (121', 122') is provided;

   - the first traction press jaw (12', 112') is mounted on a ring segment (122'), which is not part of the first partial ring (20, 120);

   - one end of the second partial ring (20', 120') is coupled in a traction-transmitting manner to a second traction press jaw (12, 112), which is movably mounted on ring segment (122) of the first partial ring (20, 120).
2. Procedure for radial pressing of workpieces,
   comprising the introduction of a traction (F, F') in coupling points (K, K') of a ring consisting of ring segments (121, 122, 121', 122'), in order to cause the ring to close,
   characterized in that the traction is transmitted via a first partial ring (20, 120) of traction-transmitting ring segments (121, 122) to a first traction press jaw (12', 112') which is movably mounted on the inside of a ring segment (122'), and in that the traction is further transmitted via a second partial ring (20', 120') of traction-transmitting coupled ring segments (121', 122'),
   wherein

   - the first traction press jaw (112') is mounted on a ring segment (122') which does not belong to the first partial ring (120);

   - one end of the second partial ring (120') is coupled in a traction-transmitting manner to a second traction press jaw (112) which is movably mounted on a ring segment (122) of the first partial ring (20, 120).
3. Pressing tool (1, 100) or procedure according to one of the preceding claims, characterized in that the second partial ring (120') substantially is formed symmetrically to the first partial ring (120).
4. Pressing tool (1, 100) or procedure according to one of the preceding claims, characterized in that the first traction press jaw (112') is mounted on a terminal ring segment (122') of the second partial ring (120').
5. Pressing tool (1, 100) or procedure according to one of the preceding claims, characterized in that two ring segments (121, 122; 121', 122') are coupled to one another or a ring segment (122; 122') and a traction press jaw (112'; 112) are coupled via a hinge joint (G1, G2', G1', G2').
6. Pressing tool (1, 100) or procedure according to one of the preceding claims, characterized in that at each ring segment (121, 122, 121', 122') is mounted at least one movable press jaw (111, 112, 111', 112').
7. Pressing tool (1, 100) or procedure according to one of the preceding claims, characterized in that the movable press jaws (111, 112, 111', 112') are mounted in such a way that they have substantially the same distance (Δ) to each other before and/or during the pressing process.
8. Pressing tool (1, 100) or procedure according to one of the preceding claims, characterized by a holding device (125) by means of which a ring segment (121) can be held relative to an adjacent ring segment (122) in at least one, preferably two, defined angular positions.
9. Pressing tool (1, 100) or procedure according to one of the preceding claims, characterized in that the coupling points (K, K') are provided for the application of a crimping tool (Z).

Images