EP1455969A1

EP1455969A1 - Pressing device

Info

Publication number: EP1455969A1
Application number: EP02799743A
Authority: EP
Inventors: Egbert Frenken
Original assignee: Gustav Klauke GmbH
Current assignee: Gustav Klauke GmbH
Priority date: 2001-12-08
Filing date: 2002-12-09
Publication date: 2004-09-15
Anticipated expiration: 2022-12-09
Also published as: DE10257613A1; US20050125978A1; ES2254784T3; EP1455969B1; US7788779B2; DE50205843D1; US20080276683A1; AU2002364392A1; ATE317733T1; WO2003049883A1; US7779523B2

Abstract

Press force is applied by two press elements hinged togethr via angle levers (8,9) which press off press element (5) and connect in tension to element (6). The angle lever (8) is joined to lever (9) for tension transfer. The press elements (5,6) face one another and their ends associate with knee levers (10), being joined to this (10) by outside joint (12,13). The levers (8,9) differ in length so the shorter knee lever (8) applies force through element (14) excentric to the outside joint specified. The longer lever (9) of the one or both knee joints (10) is joined to an additional press element (15,16).

Description

pressing device

The invention relates to a pressing device for connecting pressing tubular workpieces, in particular from a pipe end on the one hand with an attached fitting on the other hand, with plastic deformation in any case one of the workpieces, with a plurality of pressing members, the pressing members being movable on a central longitudinal axis of the workpieces for carrying out the pressing ,

Such a pressing device is known, for example, from US Pat. No. 3,666,250. In this known pressing device it is advantageous that the individual pressing members can be moved centrally towards the longitudinal axis of the workpieces to be connected. However, this known pressing device is complex to the extent that the individual pressing members are each hydraulically operated individually.

In addition, reference is made to US Pat. No. 2,211,008 in the prior art. In this known pressing device, which has three pressing jaws connected to one another to form a pressing chain, it is advantageous that the pressing force is applied in a mechanically simple manner with a lever transmission. However, there is still a not negligible circumferential component in the movement of the pressing members in the course of pressing.

Starting from the initially mentioned prior art, the invention is concerned with the task of specifying a pressing device with a plurality of pressing jaws which, with a comparatively simple construction, enables the pressing members to be delivered as centrally as possible during the pressing.

This object is achieved with the subject matter of claim 1, the focus being on the fact that in any case two pressing members for applying pressing are articulatedly connected to one another by means of two articulated levers designed as angle levers, the angle levers being supported in a pressing manner on a first pressing member and both angle levers being tensile connected to the same second pressing member. The angle levers, which are pressed against the first pressing member, make it possible to move the first pressing member centrally to the longitudinal axis of the workpieces to be pressed in the course of pressing. Because the second press jaw is pulled by means of the angle lever, this second press jaw can also be pulled centrally onto the longitudinal axis of the workpieces. There is practically no movement of the pressing members in the circumferential direction.

In a further development it is also provided that the angle levers are each connected to the articulated lever with a joint lever that transmits tensile force. In this respect, the angle lever can also be described as one of the two articulated levers of a knee joint, as also mainly addressed below.

The force is also preferably introduced into an articulated lever outside an external joint. The joints of the toggle-type arrangement connected to a pressing member are external joints. For an expedient further development it can be provided that the first and the second pressing member are arranged opposite one another with respect to the pressing cross section.

An opposing arrangement of the pressing members is preferably understood to mean one in which the ends of two pressing members are opposite one another in mirror symmetry with respect to a reference line running within the press cross-sectional plane. It is further preferred that the two pairs thus formed are each assigned a knee lever in the circumferential direction of the ends of the first and second pressing members, the ends of a pair each having an outer joint of the ordered toggle are connected. In particular, there is also the possibility that the toggle levers are arranged in mirror symmetry with respect to a reference line running within a press cross-sectional plane and perpendicular to the aforementioned axis of symmetry. This enables force to be introduced into the press device at two further locations, ie a total of four. Furthermore, depending on the number of press members, a larger number of toggle levers can of course also be used, with different symmetries being possible with regard to their arrangement in order to achieve the most uniform possible introduction of force.

In an expedient further development, the toggle levers can in turn be coupled to one another in order to achieve a synchronization of their movement sequence or the equal distribution of the application of force to one another, for example by rigid or flexible transmission elements such as levers, articulated levers, cable pulls or other suitable means. Basically there is

Possibility that ends of pressing members that are not connected by toggle levers are connected to a corresponding number of joint bolts by single or double joints, or, as will be explained below, have displaceable guides.

With regard to the one or more toggle levers, it is further preferred that the two articulated levers of a toggle lever have different lengths from one another, so that the knee joint is at a different distance from the pressing members connected to the toggle lever. In particular, the length of the one articulated lever can be a multiple, preferably two to three times the length of the second articulated lever connected to it.

If the lengths of the two articulated levers are not the same, there is the possibility that depending on the press device in the installed position th distance of the outer joints in the press position and possibly also in an untensioned starting position of the press chain, the advantageous situation arises that a projection of the knee joint onto a straight line leading through the two outer joints in the area of the outer joint of the shorter joint lever or even on the other outer joint opposite side.

When a force is introduced into the shorter articulated lever, for example, which leads to a reduction in the distance between the outer joints, the shorter articulated lever results in the aforementioned pressure effect on the press member connected to it and a tensile effect on the connected articulated member via the longer articulated lever Press member that contain oppositely directed components. Basically, d. H. Regardless of the length ratio of the two articulated levers, introducing force into an articulated lever outside an outer joint offers further advantages depending on the position of the point of application of force on the articulated lever and depending on the direction of the applied force, for example a tensioning device of the pressing device. In a preferred variant it is provided that the location of the application of force lies away from a straight line through the knee joint and the outer joint of the articulated lever experiencing the force application and that the force introduced has a component in the direction of this straight line.

This means that a torque is transmitted to the articulated lever by the force introduced, whereby depending on the selected spacing ratio external joint / location of the force application and external joint / knee joint, if necessary, a movement or force transmission or reduction on the ends of the compression members connected to the toggle lever is possible. In an expedient embodiment, it can be provided that a comparatively shorter articulated lever of a toggle lever eccentrically to its outer joint Has force introduction element. The force introduction element can be, for example, a bolt which is connected to the articulated lever in a form-fitting, force-fitting or material-locking manner in its direction of movement. Particularly in connection with the above-described axisymmetric arrangement of two toggle levers, it is preferably contemplated that a force introduction element is provided on each of the toggle lever ends facing one another.

Corresponding articulated levers or angle levers can have, for example, a triangular shape, in the triangular regions of which the outer joint, the knee joint and the force introduction element are arranged, the corner regions with the force introduction elements determining the smallest distance between the shorter articulated levers of two toggle levers. Alternatively or in combination, there is the possibility that the outer joints of these two articulated levers are articulated in the region of the two opposite ends of one and the same pressing member, so that there is a constant distance between these outer joints. Starting from an initial position, in which no or no significant force is introduced into the force line elements, the press chain can be pressed while reducing the press cross section by further reducing the distance between the force application elements of the toggle levers until a limitation of the pressing movement or The cross-section is reduced by a, possibly mutual, stop of the relevant articulated lever. The spacing of the force introduction elements can expediently be carried out with a tensioning device, as can be seen, for example, from WO 98/40178 or DE 10010601 AI, the content of which is incorporated in full in the present application, also for the purpose of features in claims of the present application. The force introduction elements can in turn with regard to their cross section and if necessary, further dimensions can be adapted to a force application of a pincer-shaped press jaw of a clamping device.

A further expedient embodiment is based on the fact that in the circumferential angular range of the comparatively longer articulated lever of one or both knee joints, a further or respectively a further pressing member is arranged. For this purpose, it can be provided that such a further pressing member is gripped by the articulated levers in a pressing cross-sectional plane. Alternatively or in combination, the pressing member can also have recesses for penetration with the articulated levers. According to a further preferred embodiment, it can be provided that two adjacent pressing members on ends that face one another in the circumferential direction have corresponding projections and recesses in the circumferential direction that are associated with one another and that run in the circumferential direction. According to this aspect, which is also of independent importance in the present application, mutual guidance of the pressing links of the pressing chain is achieved. In particular, this opens up the possibility of not articulatingly connecting individual adjacent pressing members to one another, although a predetermined relative movement between the pressing members connected in this way takes place due to the sliding guides when force is introduced into the pressing chain in order to reduce the press cross section. For example, pressing members with pressing jaws that spring back in the circumferential direction and pressing members with pressing jaws that protrude in the circumferential direction opposite their ends can be arranged alternately in the circumferential direction. In further concretization, there is the possibility that a press jaw projecting in the circumferential direction has a radially outward-facing outer wall section that extends in the circumferential direction, that an adjacent press member, starting from a press jaw that recesses in the circumferential direction, has a radially inward-facing inner wall section that runs in the circumferential direction The inner wall section and the outer wall section extend at substantially the same radial distance from the center of the press cross section and have an increasing overlap from a starting position to a closed or pressed position of the press chain. In particular, such a sliding guide can be implemented between all adjacent pressing members of a pressing chain, so that, in view of the overlaps pointing in the circumferential direction, there is a completely continuous covering of the workpieces by the pressing chain over the entire circumference before the force is introduced. In order to place the device around the workpieces to be pressed together before a pressing operation, it can be provided that it can be opened at a practically arbitrary joint by loosening the hinge pin or can be closed again there after the workpieces have been inserted. This means that in such a device, in contrast to a press chain to be closed in the course of a pressing operation, there are no separately designed ends that give off a possible weak point for the pressing.

In addition, there is the possibility that a pressing member arranged in the circumferential angular range of an articulated lever is secured captively to the articulated lever. when the pressing member penetrates through the articulated lever, this can be achieved in that the articulated lever with a projection, for example a pin, enters a recess of the pressing member which is closed and enclosed within a pressing cross-sectional plane. The size of the recess is dimensioned such that the pressing member is not hindered during the movement predetermined by the sliding guides during the pressing process

An expedient development is also possible in such a way that a pressing jaw of a pressing member in a cross section perpendicular to the pressing cross section has a semicircular recess extending radially outwards, on one side adjacent to this has a radially inwardly projecting pressure web and on the other side adjacent to it radially inwardly projecting dowel pins. The dowel pins can be designed as a plurality of cylindrical pins which are inserted into bores in the press jaw which run radially from the press surface of the press jaw. While the semicircular or cross-section, which is comparable in terms of its cross section, is adapted to a cross-sectional expansion of the fitting for receiving a sealing element, for example an O-ring, the dowel pins serve the purpose that the pressing device can be closed in a predetermined orientation of the workpieces. If the workpieces are correctly aligned, it is ensured that the radially inwardly projecting pressure web leads to a plastic deformation of overlapping regions of the workpieces to be pressed during the pressing process. The correct alignment of the workpieces is achieved by the dowel pins, which support them only if the workpieces are incorrectly aligned against the cross-sectional widening of the pushed-on workpiece, so that the pressing device does not extend to the workpieces except for the insertion of a removed hinge pin Can be reduced in scope. This is achieved, for example, in that the pushed-on workpiece, in the cross section perpendicular to the press cross section, has an asymmetrical bulge, which enters the semicircular recess of the press jaw, the steeper flank of which does not constitute an obstacle for the dowel pins, while the second, flat, falling flank closes the said support of the dowel pins. On the other hand, it is achieved that the press device fits around it even if the workpieces are aligned incorrectly, but can be put around, but cannot be closed. Even if a dowel pin should lose its effectiveness (spring) or should be damaged (especially with rigid training), the safety factor is not completely lost. Incorrect handling, if any, can result in practically no significant damage. The invention is explained in more detail below with reference to the accompanying drawings, which only show exemplary embodiments. It shows:

Fig. 1 is a perspective view of an inventive processing Pressvorrich- ^w ith inserted therein, with each other to be pressed workpieces;

2 shows an exploded perspective view of the individual parts of the pressing device according to the invention;

3 shows a perspective view of the pressing device according to FIG. 1 in an open position without workpieces;

4 shows a perspective view of the pressing device according to FIG. 1 in a pressing position without workpieces;

5 shows a side view of the pressing device according to FIG. 1 in an open position with workpieces to be pressed;

Fig. 6 is a sectional view according to section line VI-VI in Fig. 5;

FIG. 7 is a sectional view along section line VII-VII in FIG. 5 with the locking bolt inserted;

FIG. 8 is a sectional view with the locking bolt disengaged with respect to FIG. 7;

Fig. 9 is a side view of the pressing device according to Fig 1 in grouting ^• position to be pressed with workpieces. 10 shows a simplified side view of the pressing device according to the invention with the device open;

11 shows a side view of the pressing device according to the invention with the device open but already placed around the workpieces to be pressed;

12 shows a side view of the pressing device, in a ready-to-lock arrangement, but before the start of a pressing process;

13 shows a perspective view of the pressing device according to the invention in connection with pressing jaws of a clamping device;

FIG. 14 shows a pressing device according to FIG. 1, but with the location of a further pressing member (auxiliary pressing member) by means of a spring;

Fig. 15, ^'press apparatus according to Fig. 14 in the pressed state.

16 shows a sectional view according to XVI-XVI in FIG. 5 with the workpieces correctly oriented;

17 shows a sectional view according to FIG. 16 with incorrect orientation of the workpieces;

18 shows a sectional view with dowel pins modified compared to FIG. 16; FIG. 19 shows a side view of the pressing device with workpieces to be pressed which are used in the opposite manner to FIG. 12;

20 shows a cross section through the pressing device, folded around a pipe with a fitting and dowel pins of a second embodiment, closing of the pressing device not possible;

FIG. 21 shows a representation according to FIG. 20, but given the pipe with fitting fitted the other way round, closure of the pressing device; and

22 shows a representation according to FIG. 19 after pressing.

1 shows a perspective view of a preferred embodiment of the pressing device 1 according to the invention with tubular workpieces inserted therein that are to be pressed together. As can be seen in connection with the following figures, these workpieces are a tube 2 which is inserted into a fitting 3.

The workpieces have a common central longitudinal axis A.

As can be seen in connection with FIG. 2, the pressing device 1 in the exemplary embodiment shown consists of four pressing members. In the sense of the present invention, this means that a total of four pressing members are involved in the pressing process of the workpieces, while - as explained below - in the exemplary embodiment, only two of the four pressing members are connected components via tensile force transmission joints. The pressing device 1 initially has two pressing members 5, 6 lying opposite one another in the circumferential direction, which, in order to change a pressing cross-section 7 (cf. FIGS. 3, 4) to one another, by means of two toggle levers 8, each of which is designed as an angle lever, and one toggle lever 9 are displaceable to each other. An articulated lever 8 is connected to an articulated lever 9 by means of a knee joint 11. The articulated lever 8 has an outer joint 12 which is connected to the pressing member 5.

The articulated lever 9 has an outer joint 13 at its opposite end, which is connected to the pressing member 6. In view of the recognizable axially symmetrical arrangement of the two toggle levers 10, the same reference numerals have been chosen for corresponding elements as in the following. In the respective circumferential angular range of an articulated lever 9, which has a greater length than the articulated lever 8, a further pressing member 15, 16 is provided, the pressing members 15, 16 also being opposite one another with respect to the pressing cross section.

The pressing members 5, 6 are not connected to the pressing members 15, 16 by means of joints, but are only held captively on the articulated levers 9 and, as explained in more detail below, are guided on the pressing members 5, 6 by means of sliding guides. This means that in the exemplary embodiment of the pressing device according to the invention described here, the pressing members even regularly enclose the pressing cross section or the workpieces to be pressed over the entire circumference even before the pressing process begins.

In contrast to conventional press chains, the regular enclosure does not have any end links that offer a possible weak point, so that there is no interruption of the enclosure in any area. ß arises by pressing members spaced apart from each other.

Furthermore, according to the exemplary embodiment with the four pressing links, there is also no conventional chain in the sense of "link to link". Instead, only two of a total of four pressing members involved in the pressing process of the device are articulated into the device by means of intermediate power transmission elements. Furthermore, in the exemplary embodiment described, with respect to the press cross section, there is an arrangement of integrated pressing members and intermediate elements which alternate in the circumferential direction.

The two pressing members provided as intermediate elements, also referred to as auxiliary members, are only held captively on the force transmission elements, in the present case the toggle levers, with additional guidance being possible via contact surfaces on the respectively adjacent integrated pressing members. The integrated pressing members are arranged by means of the contact surfaces in a form-fitting manner in such a way that the auxiliary members are prevented from deflecting radially outward relative to the integrated pressing members in the course of a pressing operation.

While in conventional press chains, adjacent press links are all connected either directly or, if necessary, by mere connecting elements in such a way that a tensile force is passed in the circumferential direction through all the press links, so that the press chain fails altogether if any single press link fails, this is the case with the described embodiment in the pressing members, which are only held captive, advantageously avoided. Accordingly, the press device according to the invention does not require any between the Circumferential joint force transmitted along adjacent links, but by means of the toggle levers, a radially oriented force transmission can take place on both chain-like integrated and circumferentially spaced pressing members, from where the introduced pressing force via the contact surfaces described above primarily as pressure and thrust force on neighboring, not in the press chain integrated press links is transferred.

Furthermore, force introduction elements 14 are provided on the articulated levers 8 for the application of force outside the outer joint. In the exemplary embodiment shown, the pressing members 6, 15 and 16 and the articulated levers 8 each have four parallel-spaced plate regions with parallel joints in between. In contrast, the pressing member 5 and the articulated lever 9 each have three comparable spaced plate regions which are dimensioned and spaced in such a way that an engagement in the joints of the pressing members 6, 15 and 16 and the articulated lever 8 and thus a mutual one

Penetration of the same is made possible. With regard to the pressing members 5, 6, 15 and 16, the plate regions are connected to one another in one piece via pressing jaws 17, 18, 19, 20, as a result of which a stable configuration is obtained. At the same time, there are advantages in terms of production in that the pressing members 6, 15 and 16 are obtained with the same dimensioning and spacing of plate areas by cutting from a common semi-finished product.

The articulated connections explained between the pressing members 5, 6 and the articulated levers 8, 9 are made through terminal bores penetrating one another in the assembled state, inserted through the cylindrical pins and held at their ends by retaining rings. In the exemplary embodiment shown, it is provided that the press chain on the knee joint 11 of the upper toggle lever 10 can be opened by removing a coupling pin 21. However, this does not imply Selection, but instead the press chain could also be opened by removing, for example, a hinge pin from one of the outer joints and closed again after inserting the workpieces to be pressed together.

It is clear from FIG. 3 that even after inserting the coupling bolt 21, even before the actual pressing process begins, a pressing cross-section 7 is obtained which comprises pressing members 5, 6, 15 and 16. At the same time it can be seen that in a pressing process in which the distance between the force introduction elements 14 is reduced, the force introduced is greater than that

The toggle lever 10 is introduced at four points distributed over the circumference of the press cross-section 7, namely the external joints 12 and 13 which are present in pairs. Before the pressing process, gaps 22 are left between the pressing members 5, 6, 15 and 16 between the pressing jaws, the boundary walls of which come to rest in the pressing position shown in FIG. 4. The pressing position is at the same time defined by a stop of the articulated levers 8 in their corner regions with the force introduction elements 14.

FIG. 5 shows a side view of the embodiment of the pressing device according to the invention shown in FIGS. 1 to 4 in the position corresponding to FIG. 3 with the pressing device 1 closed before the pressing process begins. From this it is again clear that the length of the articulated lever 8, ie the distance between the knee joint 11 and the outer joint 12, is chosen to be smaller than the distance of the articulated lever 9, ie the distance between the knee joint 11 and the outer joint 13. Furthermore it becomes clear that the pressing members 5, 6 are designed with pressing jaws 17, 18 that spring back in the circumferential direction and the pressing members 15, 16 are designed with pressing jaws 19, 20 that protrude in the circumferential direction toward their ends. The pressing jaws 19, 20 projecting in the circumferential direction have a wall section 23 that runs in the circumferential direction and faces radially on the outside. In contrast, the adjacent pressing members 5, 6, starting from a pressing jaw 17, 8 that springs back in the circumferential direction, have an inner wall section 24 that extends in the circumferential direction and faces radially on the inside, the inner wall sections and the outer wall sections being at the same radial distance R from the center of the pressing cross section 7 and have an increasing overlap from the starting position shown in FIG. 5 to the pressing or closing position shown in FIG. 9.

These wall sections 23, 24, which are in pressure engagement with one another during pressing, represent a positive connection in the radial direction. As a result, pressing force is transmitted from the first and / or second pressing member 5, 6 to a further pressing member 15, 16.

In FIG. 5, two alternative or combinable means for limiting the rotation of the articulated levers 8 are also provided. The rotation limitation is in each case formed by a stop for an edge 42 of the articulated lever which is effective at a limit rotation angle. One stop is formed in the form of an edge 43 of the pressing member 15 or 16, against which the edge 42 abuts the articulated lever 8 at a preselected opening angle. In the variant, the stop is in each case formed by an end 44 of a pin projecting beyond the pressing member, a stop against the edge 42 likewise taking place at a predetermined opening angle. The rotation limits described above can preferably be designed or arranged such that only a maximum opening angle of the articulated lever 8 can be achieved, at which the guide surfaces of the inner wall sections and outer wall sections with the press chain closed still have a circumferential overlap with one another remain so that an unlimited rotation of the pressing members 15, 16 around the captive device is prevented at every possible opening position of the gel lever 8.

The captive device consists in detail of a mandrel 44 (cf. in particular FIGS. 14, 15) which is attached to a further pressing member 15, 16. The mandrel 44 - advantageously two mandrels 44 are formed on a pressing member 15, 16 opposite one another - protrudes into a recess 45 of an articulated lever 15, 16. The recess 45 also limits the mobility of the further pressing member 15, 16 relative to the articulated lever 9 (the Mobility is also limited by the positive engagement to the first or second pressing member 5, 6).

FIG. 6 shows a sectional view of the pressing device 1 along the section line VI-VI in FIG. 5. It is clear that a pipe 2 and a fitting 3 pushed over it are inserted as workpieces in the pressing cross section. The fitting has a radial bulge 25 running in the circumferential direction, which is assigned in terms of position to a semicircular, radially outward-pointing recess 26, which likewise extends over the circumference in the press jaws.

Fig. 7 shows a sectional view according to section line VII-VII in Fig. 5, wherein the coupling bolt 21 for closing the knee joint 11 is inserted into bores within the articulated levers 8 and 9. In this position, the coupling bolt can still be fixed to the tapered end by a locking washer, not shown in the drawing.

FIG. 9 shows a pressing position in which the pressing members have been moved radially inwards towards the longitudinal axis A of the workpieces. 8 shows such a section, in which the coupling bolt 21 is almost completely pulled out of the bores for opening. In this case, however, the coupling pin 21 deliberately plunges into a holding plate 31 to such an extent that a holding element 33 enters an annular groove 32 and thereby forms a captive device. The holding element 33 can be, for example, a grub screw, a cylinder pin pressed resiliently against the annular groove or the like.

10 to 12 show in succession the sequence of movements when the press device 1 is closed, a simplified representation having been chosen compared to the preceding figures. 10 describes an open position on the knee joint 11 so that ends thus formed for inserting or enclosing the workpieces 2, 3 are pulled apart.

FIG. 11 shows a further state that has passed during the closing movement of the device 1, shortly before the articulated levers 8 and 9 have been pivoted into the overlapping position required for inserting the coupling bolt 21.

Fig-. 12 shows the device in the required overlap, the coupling bolt 21 having to be inserted due to the overlapping bores.

13 shows a perspective view of the press device 1 according to the invention, also shown in the previous figures, in conjunction with pliers-shaped press jaws 34 and a clamping device 35. The press jaws 34 are connected in a rotationally fixed manner to a lever 37 by bolts 36, the levers 37 are rotatably received by axles 38 in two parallel tabs 39. The tabs 39 have a fixed attachment to the Rigen not shown drawing device 35 holes 40. The sliding bodies 41 shown are pressed during a pressing process by a pressure ram of the tensioning device 35 in the direction of the fixed point on the bore 40, so that the levers 37 are spread apart due to the shape of the inner walls of the lever. On the side opposite the axes 38, this causes a reduction in the distance between the press jaws 34. These are positively connected to the articulated levers 8 by means of the force introduction elements 14. During a pressing operation, thus the distance is reduced between the force introduction elements 14, which via a DRE ^'hung or angle of the toggle levers 8 and 9 leads to the above-described reduction of the pressing cross section. 7

An advantageous location specification of the further pressing members 15, 16 in the network of the pressing device is explained with reference to FIGS. 14 and 15.

Another pressing member 15, 16 is in a circumferential distance position, cf. Distance a in Fig. 14, biased to a first or second pressing member 5, 6. The pretensioning is realized by means of spring elements 46 (only one spring element 46 is shown in each case in FIGS. 14 and 15; however, it goes without saying that both further pressing members 15, 16 are each connected to an articulated lever 9 by at least one spring element 46). The pretension is limited by a positive connection to the articulated lever 9, as will be explained further below. The limitation is provided in such a way that the circumferential distance a to the first and second pressing members 5, 6 is the same in each case.

In the course of pressing, this circumferential section is reduced in that all the pressing jaws move inwards centrally, not in that the pressing jaws move circumferentially. The form-fitting movement restriction is achieved in that a mandrel 44 rests on a circumferential edge of the recess 45, as shown in FIG. 14, in the initial state. Furthermore, the recess 45 is selected such that after the pressing, the mandrel 44 is located on a diagonally opposite edge section of the recess 45 when diagonally passing through the slot-like recess.

The subject matter of the invention, which is important alone or in combination with the features described above, is also a press jaw 34 for a press device, as is described in detail here. It is important here that the press jaw 34 is formed by overlapping and spaced-apart jaw elements 47, cf. For example, Fig. 13. The jaw members 47 have through holes located at their free ends (based on the state of attachment to the press device, before connection to a press chain) in overlap.

The jaw elements 47 are designed as flat parts. At their other end, which is connected to the pressing device, they are connected to a solid jaw foot 48. This is done by the bolts 36 already mentioned. In this respect, the cheek foot 38, which is recessed in a U-shape, engages around the cheek elements

47th

Furthermore, the jaw elements 47 are adapted in their thickness to the engagement distance between plate parts of the articulated lever 8.

FIG. 16 shows a sectional view along section line VII - VII in FIG. 5, but in contrast to FIG. 6, dowel pins projecting from the radial inner wall of the pressing jaw 19 are additionally provided. In the exemplary embodiment shown, four are distributed evenly over the circumference arranged dowel pins 28 are implemented, which are inserted in radially extending blind holes extending from the inner wall of the press jaws. 7 shows a positionally correct, ie intended, alignment of the workpieces in the pressing device, in which the bulge 25, which is asymmetrical in the plane of illustration, comes to lie with a steep flank to the side of the dowel pin.

In contrast, FIG. 17 shows the opposite alignment of the workpieces, in which the dowel pin 28 comes to rest on a flat flank of the bulge 25 when the pressing device is closed before the pressing device can be closed completely (cf. 19). The correct arrangement of the workpieces ensures that the pressure web 27 comes to lie in the area of a workpiece overlap, in the area of which a plastic deformation is to take place. In contrast, plastic deformation on the opposite side of the bulge 25 would be undesirable, since this would jeopardize the secure contact of a sealing ring which can be accommodated within the bulge 25 and is not shown in the drawing.

FIG. 18 shows an embodiment of the dowel pins which is modified compared to FIG. 16, in which a pressure pin 29 is prestressed by a compression spring 30 in such a way that the press chain cannot be closed either in the undesired alignment of the workpieces shown. As an alternative to this design of the dowel pins, this can also have set screws which can be adjusted as required by means of a nut thread in a radially running bore.

In the embodiment of FIGS. 20 to 22, dowel pins 28 are used, which are also cushioned against a compression spring 30 according to FIG. 18. However, while in the first embodiment, the dowel pins 28 are arranged so close to the recess 26 of the press jaw that they hit the inclined surface 44 of the fitting when used incorrectly (FIGS. 17, 18), the dowel pins 28 are in the embodiment 18 to 19 are arranged outside the press jaw and thus so far from the recess 26 that they only come into contact with the horizontal section of the fitting when used incorrectly. Nevertheless, the pressing device described here means that it can still not be closed if it is used incorrectly (FIG. 20).

The dowel pins 28 are received in a holder 44 placed on the outside of the press jaw 20.

A dowel pin 28 is biased by the spring 30 in its extended position, as shown in FIGS. 18 and 19.

The pre-tension is so high that it cannot be overcome by normal hand force when turning over. For example, it is 200 N per dowel pin.

The spring preload, which is subsequently overcome by the pressing force during the pressing process, also means that no damage to the unaffected pipe can occur. It is accordingly chosen so that it leaves no or no significant press impression in the tube.

This spring preload is accordingly of importance for the fact that the dowel pins can be arranged at the stated distance from the recess 26, therefore protrude correspondingly far onto the pipe, but nevertheless cannot cause any damage in the course of the pressing. All of the features disclosed are (in themselves) essential to the invention. The disclosure content of the associated / attached priority documents (copy of the prior application) is hereby also included 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

EXPECTATIONS

1. Press device (1) for connecting pressing tubular

Workpieces, in particular from a pipe end (2) on the one hand with an attached fitting (3) on the other hand, with plastic deformation in any case one of the workpieces, with a plurality of compression members, the compression members being movable towards a central longitudinal axis of the workpieces for carrying out the compression, characterized in that that in any case two pressing members for applying pressing force are articulated to one another via two articulated levers designed as angle levers, the angle levers being supported in a pressing manner on a (first) pressing member (5) and both angle levers being tension-connected with the same (second) pressing member (6) are.

2. Press device (1) according to claim 1 or in particular according thereto, characterized in that the articulated lever (8) designed as an angle lever is connected to an articulated lever (9) which transmits a tensile force.

3. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that the first and the second press member (5, 6) with respect to the press cross section (7) are arranged opposite one another.

4. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that both pairs of ends of the first and second pressing member (5, 6) facing each other in the circumferential direction are each assigned a toggle lever (10) The ends of a pair are each connected to an outer joint (12, 13) of the associated toggle lever (10).

5. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that the

Articulated levers (8, 9) of a toggle lever (10) have different lengths.

6. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that the

The toggle levers are axially symmetrical with respect to a reference axis running within the press cross-sectional plane through the center of the first and second press members (5, 6).

7. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that a comparatively shorter articulated lever (8) of a knee joint (10) eccentrically to its outer joint has a force introduction element.

8. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that a force introduction element (14) is provided on each of the toggle levers (10) on articulated lever ends facing one another.

9. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that a force introduction element (14) is adapted with respect to its cross section to a force application of a pincer-shaped jaw (34) of a clamping device (35).

10. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that in the circumferential angle range of the comparatively longer articulated lever (9) of one or both knee joints (10), a further or respectively a further pressing member (15 , 16) is arranged.

11. Press device according to one or more of the preceding claims or in particular according thereto, characterized in that a further pressing member (auxiliary member 15, 16) by a first and / or second

Press member 5, 6 for applying press force by means of a positive connection acting in the radial direction with respect to the axis (A) is acted upon by this first and / or second press member (5, 6).

12. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that the pressing members (5, 6) connected to one another via the articulated levers (8, 9) comprise interposed auxiliary members (15, 16) in a form-fitting manner, so that the auxiliary members (15, 16) are prevented from deflecting radially outward relative to the pressing members (5, 6) in the course of a pressing operation.

13. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that two adjacent pressing members (5, 6, 15, 16) at mutually facing ends in the circumferential direction corresponding projections and recesses with mutually associated, in Have circumferential sliding surfaces.

14. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that pressing members (5, 6) with pressing jaws (17, 18) which spring back in the circumferential direction and auxiliary members (15, 16) with opposite ones Ends in the circumferential direction projecting press jaws (19, 20) in

Are arranged alternately circumferential direction.

15. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that a pressing jaw (19, 20) projecting in the circumferential direction has a circumferentially extending, radially outer facing outer wall section, that an adjacent pressing member (5, 6 ) starting from a press jaw (17, 18) which recesses in the circumferential direction, has an inner wall section running radially on the inside in the circumferential direction, that the inner wall section and the outer wall section extend at substantially the same radial distance R from the center of the press cross section (7) and have an increasing overlap from an initial position to a closed position of the press chain.

16. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that an auxiliary member (15, 16) arranged in the circumferential angle region of a joint lever (9) is fastened captively to the joint lever (9).

17. Press device according to one or more of the preceding claims or in particular according thereto, characterized in that a further pressing member (15, 16) is biased into a circumferential spacing position from a first (second) pressing member (5, 6).

18. Press device according to one or more of the preceding claims or in particular according thereto, characterized in that the pretensioning is achieved by means of spring elements (46).

19. Press device according to one or more of the preceding claims or in particular according thereto, characterized in that a spring element (46) between a press member (15, 16) and an articulated lever (9) is effective, with a form-fit movement restriction between this press member (15, 16) and the articulated lever (9).

20. Press device according to one or more of the preceding claims or in particular according thereto, characterized in that the form-fitting movement restriction is achieved by the pin (44) abutting an edge of the recess (45).

21. Press device (1) according to the features of the preamble of claim 1 or according to one or more of the preceding claims or in particular according thereto, characterized in that a press jaw (17, 18, 19, 20) in a perpendicular to the press cross-section (7) Cross-section a semicircular recess extending radially outwards

(26), on one side adjacent to this, has a radially inwardly projecting pressure web (27) and on the other side, adjacent, radially inwardly projecting dowel pins.

22. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that the plurality of dowel pins (28) are inserted in radially running bores of the press jaw (17, 18, 19, 20).

23. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that a dowel pin (28) is received in a holder (44) placed on the outside on a press jaw (20).

24. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that a dowel pin (28) can be retracted against spring force.

25. Press device (1) according to one or more of the preceding claims or in particular according thereto, characterized in that a dowel pin (28) is biased in its extended position.

26. Press jaw (34) for a pressing device, in particular a pressing device according to one of claims 1 to 25, characterized by overlapping and spaced-apart jaw elements which have through holes located at their free ends protruding from the pressing device.

27. Press jaw according to claim 26 or in particular according thereto, characterized in that the jaw elements are designed as compartment parts.

28. Press jaw according to one of claims 26 or 27 or in particular according thereto, characterized in that the jaw elements are connected at the other end to a solid jaw foot.