EP3610988B1 - Pressing device with centred bolt fixing - Google Patents

Description

TECHNICAL AREA

The present invention relates to a pressing device according to the preamble of claim 1.

STATE OF THE ART

Pressing devices are known from the prior art and are used, for example, in the electrical field or in pipeline construction to create press connections. The individual parts of the pressing devices are often put together by means of releasable connecting means such as screws, snap rings or circlips or snap-on caps.

So is from the DE 10 2012 100 357 A1 a tool jaw with detachable tool jaw halves known. The mold jaw halves are attached using hollow bolts and pins. the EP 1 092 487 A2 discloses a pressing device with pressing levers, the pressing levers being releasably attached by means of screws or locking rings. In the event of a defect in a press lever, these safety elements induce the user to replace it with a new, unused or otherwise worn press lever. This exchange has several disadvantages. On the one hand, the different levels of wear and tear, which a person skilled in the art cannot necessarily recognize visually, lead to incorrect crimps. On the other hand, if one lever is not properly replaced, parts of the tool break off during the pressing process and, due to the prevailing forces, fly away from the pressing device like projectiles, which represents a clear risk of accidents for the fitter.

To overcome these disadvantages is out of the EP 3 231 528 A1 a pressing device according to the preamble of claim 1 known, in which the pressing jaws are fastened by bolts with non-releasable or non-destructively releasable connecting elements.

Since the pressing devices are heavily stressed in use, an imprecise assembly of the individual parts during assembly can lead to a safety risk. In addition, the endeavor to attach the connecting means to the pressing device in as aligned a manner as possible is often associated with a great deal of force.

DISCLOSURE OF THE INVENTION

It is therefore an object of the present invention to provide a pressing device with improved assembly.

• mindestens ein Trägerelement mit mindestens einer Trägeröffnung;
• mindestens ein Presselement mit mindestens einer Lageröffnung zum Aufbringen einer Presskraft auf einen Pressling, wobei das mindestens eine Presselement um mindestens eine Schwenkachse schwenkbar am mindestens einen Trägerelement gelagert ist;
• mindestens einen Bolzen, welcher sich durch die mindestens eine Trägeröffnung und die mindestens eine Lageröffnung hindurch erstreckt;
• mindestens ein Sicherungselement, welches entlang einer Axialrichtung mit dem mindestens einen Bolzen verbindbar ist, wobei der mindestens eine Bolzen durch das mindestens eine Sicherungselement bezüglich einer Verschiebung entlang der Axialrichtung in der mindestens einen Lageröffnung und der mindestens einen Trägeröffnung gesichert ist; und
• mindestens ein Befestigungselement, welches das mindestens eine Sicherungselement am mindestens einen Bolzen befestigt,

umfasst. Die Pressvorrichtung umfasst weiter mindestens ein Zentrierelement, wobei das mindestens eine Zentrierelement das mindestens eine Sicherungselement und/oder das mindestens eine Befestigungselement am mindestens einen Bolzen zentriert.This object is achieved by a pressing device according to claim 1. Accordingly, a pressing device is specified which

• at least one carrier element with at least one carrier opening;
• at least one pressing element with at least one bearing opening for applying a pressing force to a pressed part, the at least one pressing element being mounted on the at least one carrier element so as to be pivotable about at least one pivot axis;
• at least one bolt which extends through the at least one carrier opening and the at least one bearing opening;
• at least one securing element which can be connected to the at least one bolt along an axial direction, the at least one bolt being secured by the at least one securing element with respect to a displacement along the axial direction in the at least one bearing opening and the at least one carrier opening; and
• at least one fastening element which fastens the at least one securing element to the at least one bolt,

includes. The pressing device further comprises at least one centering element, the at least one centering element centering the at least one securing element and / or the at least one fastening element on the at least one bolt.

Furthermore, the at least one securing element has a recess, the at least one centering element being deformable, and the at least one centering element being at least partially bent into the recess when the at least one securing element is connected to the at least one bolt.

The term centering is understood here to mean correct alignment of the securing element with respect to the bolt and correct fastening of the securing element by means of the fastening element both in the axial direction and in a direction extending radially to a central axis of the bolt. Correct alignment is achieved, for example, when the securing element is mounted on the bolt in a linear manner, that is to say, for example, not inclined or canted or tilted. Correct fastening is analogously achieved, for example, when the fastening element, and consequently the securing element, is fastened linearly to the bolt. The at least one centering element therefore enables improved assembly.

The bolt is therefore held in the pressing device by the securing element. This is preferably a pressing device comprising a non-releasable securing element according to FIG EP 3 231 528 A1 , the content of which is hereby incorporated into this application. The non-releasable securing element prevents the bolt from being removed or exchanged, as a result of which the above-mentioned disadvantages in connection with releasable connecting means are avoided. In particular, in this way a pressing device with permanently assembled individual parts is made available which can no longer be opened after the initial assembly. The expression “non-releasable” is understood to mean that the securing element can only be separated with increased effort with the aid of tools that destroy or damage the securing element or the bolt.

The pressing device and its components can thus have the form of pressing devices known per se from the prior art. It is thus conceivable that the pressing device has the form of a press sling and the press element is designed in the form of an intermediate jaw. It is also conceivable that there are two pressing elements in the form of pressing levers and the carrier element has two carrier openings, one bolt each extending through one of the carrier openings and the bearing openings.

The securing element can be a securing element which is placed on a bolt end and which at least partially, preferably completely, encloses the bolt end. So it is conceivable that the securing element z. B. is cap-shaped or ring-shaped, wherein the bolt end is received in its interior. This means that the securing element can have the shape of an end cap which completely receives and encloses the bolt end, or the securing element can have the shape of an end ring which surrounds the outer circumference of the bolt end. The securing element preferably has an interior space, delimited by an inner wall, for receiving the bolt end, with at least one fastening element acting on the bolt end, in particular on the lateral surface of the bolt end, being arranged in the interior space. The fastening element could be a snap ring or spring ring which is placed in a groove running around the inner wall, which snap ring or spring ring engages in a groove extending circumferentially around the bolt. The spring ring or snap ring can be preassembled in the securing element, i.e. placed in its groove before the end cap or end ring is attached, so that when the end cap or end ring is attached to the bolt end, this spring ring engages or snaps into the groove at the bolt end . The above-mentioned fastening elements have the particular advantage that they enable a stronger connection between the securing element and the bolt and thereby provide additional securing with regard to an unintentional detachment of the securing element from the bolt.

In a first aspect, the at least one centering element can have the form of a stop and, when connecting the at least one securing element to the at least one bolt, provide a stop for the at least one fastening element.

The at least one centering element and the at least one securing element can be designed in one piece.

The at least one centering element can be arranged on an inner wall of the at least one securing element, and an inner diameter of the at least one securing element in the region of the at least one centering element is smaller than a diameter of the at least one bolt.

For example, it is therefore conceivable to design this securing element as a stop on the inner wall of the securing element, the stop projecting from this inner wall into the interior of the securing element. Or, in other words, in this case the stop is an element that protrudes or protrudes from the inner wall. However, it is just as conceivable to use such a stop in the form of a separate component such as, for example, an insert or sleeve inserted into the interior of the securing element. In both cases, the stop can be formed entirely within the interior. However, it is also conceivable to provide the stop only in certain areas. The inner diameter is to be understood as the clear dimension. This means that the securing element in the area of the stop preferably defines a clear dimension or an opening which is smaller than the diameter of the bolt.

For example, the securing element can have a recess in the form of an undercut. This undercut is preferably located in a distal area of the securing element, that is to say in that area which, in the case of a received bolt end, faces away from the bolt end. As already mentioned, the inner diameter of the securing element in the region of the stop is preferably smaller than the diameter of the bolt. If the securing element is now placed on the bolt, the deformable stop is increasingly bent or kinked in the direction of the distal end of the securing element and is increasingly received in the undercut.

The recess or undercut preferably has a diameter which is essentially the same size or greater than the diameter of the bolt. As a result, the bolt end can be completely received in the securing element when it is connected to the securing element.

As already mentioned, the at least one securing element can have a groove on its inner wall which extends along a circumferential direction at least partially around the at least one securing element, and wherein the at least one fastening element is at least partially received in the groove of the at least one securing element. The centering element in the form of the stop prevents the fastening element from being able to get out of the groove of the securing element when the securing element is connected to the bolt. In other words, the stop forms a counter surface for the fastening element and ensures the required counterpressure against the fastening element when the securing element is snapped out onto the bolt, so that it is not pushed away but remains in its central position and thus correctly aligned and securely in the groove of the bolt can snap into place.

At this point it should be pointed out that the pressing device can have a centering element according to the first aspect as described above or a centering element according to a second aspect as described below. However, the pressing device preferably has both a centering element according to the first aspect and a centering element according to the second aspect. The following explanations of the centering element relate to the centering element according to the second aspect.

In the second aspect, the at least one centering element can have the shape of a hollow body and at least partially surround the at least one fastening element along its circumferential direction. However, the fastening element is preferably completely surrounded by the centering element. Or, in other words, the at least one fastening element can be arranged at least partially, preferably completely, within this centering element.

The at least one centering element can have an inner diameter which is the same size or greater than an outer diameter of the fastening element. If the inner diameter of the centering element is the same or essentially the same as the outer diameter of the fastening element, the centering element and the fastening element adjoin one another, at least when the securing element and the bolt are not connected. Is the inner diameter of the Centering element larger than the outer diameter of the fastening element, there is a lateral distance between the fastening element and the centering element, at least in the disconnected state.

The at least one centering element can be arranged within the groove of the at least one securing element. The groove is preferably a profile structure with a profile base and two profile walls adjoining it. Because the centering element at least partially surrounds the fastening element along its circumferential direction, the centering element received within the groove is consequently arranged in the area of the profile base, while the fastening element is arranged in the area of the profile opening opposite the profile base. The centering element thus aligns the fastening element within the groove of the securing element and ensures that this correct alignment is also maintained during the connection of the securing element to the bolt. Correct alignment of the securing element attached to the bolt is also guaranteed.

The at least one centering element and the at least one fastening element can be arranged concentrically to one another. The centering element preferably has an annular or hollow cylinder-like shape, within which the preferably essentially annular fastening element in the form of the snap ring or spring ring is arranged.

The at least one centering element can be designed to be elastic and in particular consist of an elastomer. The centering element is preferably an O-ring which is arranged around the snap ring or spring ring.

The at least one bolt and the at least one fastening element can each have a guide surface, and the guide surface of the at least one bolt and the guide surface of the at least one fastening element provide a guided connection of the at least one securing element to the at least one bolt at least in some areas.

That is, if the securing element with the fastening element arranged therein is applied to the bolt end, a guide surface on the fastening element and a guide surface on the bolt produce a guided connection. The guide surface of the fastening element is preferably the outer surface of the fastening element facing the bolt.

The guide surface of the at least one bolt is preferably inclined with respect to a central axis through the bolt, so that the at least one fastening element is moved radially outward along the inclined guide surface of the bolt while the at least one securing element is connected to the at least one bolt.

The at least one bolt preferably has a groove which extends at least partially around the bolt along a circumferential direction, and wherein the at least one fastening element in an end state in which the at least one securing element is connected to the at least one bolt, at least partially in the groove of the bolt is added. The bolt preferably has a reduced cross section in the area of its free ends. In the disconnected state, the fastening element in turn preferably has an inner diameter which is smaller than the diameter of the bolt. When the securing element is connected to the bolt, the fastening element then slides with its outer surface along the inclined guide surfaces, the fastening element being increasingly moved radially outward. During this movement, the fastening element is pressed against the O-ring, the O-ring being compressed due to its elastic design. If the securing element is now pushed further along the bolt, the fastening element snaps into the groove in the bolt. The securing element is then fixed on the bolt.

The at least one securing element can consist of a material comprising steel and in particular a compressive strength of about 500 to 2000 N / mm ² , preferably of about 800 to 1600 N / mm ² in the tempered state and / or an elongation at break of about 2 to 20%, preferably from about 5 to 15%.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1

eine perspektivische Explosionsdarstellung einer Pressvorrichtung mit einer Bolzenfixierung nach einer Ausführungsform der vorliegenden Erfindung;

Fig. 2

eine perspektivische Ansicht einer Pressvorrichtung gemäss Figur 1;

Fig. 3

eine Detailansicht des Details I von Figur 2;

Fig. 4

eine Draufsicht auf ein Sicherungselement der Bolzenfixierung gemäss Figur 1;

Fig. 5

eine Schnittansicht des Sicherungselements nach Figur 4 entlang der Schnittebene B-B;

Fig. 6a

eine Schnittansicht des Sicherungselements und eines ersten und zweiten Zentrierelements der Bolzenfixierung gemäss Figur 3 entlang der Schnittebene A-A in einem ersten Zustand;

Fig. 6b

eine Schnittansicht des Sicherungselements und des ersten und zweiten Zentrierelements der Bolzenfixierung gemäss Figur 3 entlang der Schnittebene A-A in einem zweiten Zustand;

Fig. 6c

eine Schnittansicht des Sicherungselements und des ersten und zweiten Zentrierelements der Bolzenfixierung gemäss Figur 3 entlang der Schnittebene A-A in einem dritten Zustand;

Fig. 7

eine perspektivische teilweise Explosionsdarstellung einer Pressvorrichtung mit einer Bolzenfixierung nach einer weiteren Ausführungsform der vorliegenden Erfindung;

Fig. 8

eine Detailansicht des Details II von Figur 7;

Fig. 9

eine Detailansicht des Details III von Figur 7.

Preferred embodiments of the invention are described below with reference to the drawings, which are only used for explanation and are not to be interpreted as restrictive. In the drawings show:

Fig. 1

a perspective exploded view of a pressing device with a bolt fixation according to an embodiment of the present invention;

Fig. 2

a perspective view of a pressing device according to Figure 1 ;

Fig. 3

a detailed view of the detail I of Figure 2 ;

Fig. 4

a plan view of a securing element of the bolt fixation according to Figure 1 ;

Fig. 5

a sectional view of the fuse element according to Figure 4 along the cutting plane BB;

Figure 6a

a sectional view of the securing element and a first and second centering element of the bolt fixation according to Figure 3 along the section plane AA in a first state;

Figure 6b

a sectional view of the securing element and the first and second centering element of the bolt fixation according to Figure 3 along the section plane AA in a second state;

Figure 6c

a sectional view of the securing element and the first and second centering element of the bolt fixation according to Figure 3 along the section plane AA in a third state;

Fig. 7

a perspective partially exploded view of a pressing device with a bolt fixation according to a further embodiment of the present invention;

Fig. 8

a detailed view of the detail II of Figure 7 ;

Fig. 9

a detailed view of the detail III of Figure 7 .

DESCRIPTION OF PREFERRED EMBODIMENTS

In the Figures 1 to 6c a first embodiment of a pressing device 1 with a bolt fixation comprising securing elements 11, 11 ', centering elements 27, 27'; 28, 28 'and fasteners 18, 18' and in the Figures 7 to 9 a second embodiment of a pressing device 1 'with a bolt fixation comprising securing elements 12, 12', centering elements 27, 27 '; 28, 28 'and fasteners 18, 18' are shown. The two pressing devices 1, 1 'differ essentially only in the design of the securing elements 11, 11' and 12, 12 'from one another. It should therefore be understood that explanations relating to the pressing device 1 according to the first embodiment also relate to the pressing device 1 'according to the second embodiment, and vice versa.

As from the Figures 1 and 2 As can be seen, the pressing device 1 comprises two pressing levers 5, 5 ', two pressing jaws 4, 4' and a carrier element 2. The carrier element 2 is here essentially T-shaped and has two carrier openings 3, 3 '. The two pressing elements in the form of pressing levers 5, 5 'are designed identically and each have a bearing opening 6, 6', the pressing levers 5, 5 'being pivotably mounted on the carrier element 2 via a pivot axis A1, A2. One press lever 5 can be pivoted about the first pivot axis A1 and the other press lever 5 ′ can be pivoted about the second pivot axis A2 from a starting position into a pressing position. For this purpose, a bolt 8, 8 'providing the bearing and the pivot axis A1, A2 each extends through one of the carrier openings 3, 3' and one of the bearing openings 6, 6 '. The end of the bolt 8, 8 'is secured with a non-releasable securing element 11, 11' with respect to an axial displacement in the bearing opening 6, 6 'and in the carrier opening 3, 3'.

As can also be seen in these figures, two bolts 8, 8 'extend parallel to one another through the two carrier openings 3, 3' or bearing openings 6, 6 'of the carrier element 2 or of the press lever 5, 5', so that the both pivot axes A1, A2 also come to lie parallel to one another. During the pressing process, in which the pressing levers pivot from the starting position about the pivot axes A1, A2 with respect to the carrier element 2 into the pressing position, the pressing levers 5, 5 'are guided in this way and the pressing process can be carried out with high precision. The pressing jaws 4, 4 'facing one another are pivoted against one another to the extent that that they only have a small distance from one another and at the end of the pressing process, viewed along the pivot axes A1, A2, together form an essentially closed circle.

For this purpose, the press levers 5, 5 'each have a press jaw receptacle 22, 22' with a receiving surface into which the press jaws 4, 4 'are inserted. The pressing jaws 4, 4 'in turn comprise a pressing surface extending at least partially around a central axis M with a pressing contour 23, 23' and a receiving surface. The pressing jaws 4, 4 'are positioned with their receiving surfaces in the respective pressing jaw receptacles 22, 22' of the pressing levers 5, 5 '. The pressing contours 23, 23 'are essentially concave so that a part to be pressed, such as a fitting to be pressed, can be pressed through the pressing contour 23, 23'. If there is a fitting between the pressing jaws 4, 4 ', then this is pressed radially by the pressing jaws through the pressing contours 23, 23' in the pressing process. The bolt 8, 8 'thus serves to pivot the press levers 5, 5' on the carrier element and at the same time provides the pivot axes A1, A2 about which the press levers 5, 5 'are pivoted.

As already mentioned, the two bolts 8, 8 'are each secured at the end with a non-releasable securing element 11, 11' in the bearing openings 6, 6 'and the carrier openings 3, 3'. The bolt 8 is cylindrical and has a constant diameter DB and a full cross section over a large part of its length. The surfaces of the press lever 5 are each flush with the surface of the first and second carrier element 2, 2 'and the inner surfaces of the carrier openings 3 or bearing openings 6 and the outer surface 10 of the bolt 8 are in surface contact with one another. As in particular from the Figures 1 and 2 It can be seen that this embodiment is a securing element 11, 11 'in the form of an end cap, which is placed on the bolt end 9, 9'. The securing element 11, 11 'comprises an inner wall 14, 14' which defines an interior space 16, 16 'for receiving the bolt end 9, 9'. The distal end of the securing element, or in other words the bottom surface 24, 24 'of the cap-shaped securing element, is planar and extends perpendicularly with respect to the pivot axes A1, A2 or parallel to a plane of the carrier element 2.

As in Figure 3 As can be seen, the bolt end 9, 9 'is received in the interior 16, 16' of the securing element 11, 11 ', the inner wall 14, 14' completely surrounding these parts of the bolt 8, 8 'protruding from the carrier element 2. The bolt end 9, 9 'is completely enclosed by the cap-shaped securing element 11, 11'. It can also be seen that the securing element 11, 11 'has an outer wall 25, 25' on the outside, which is designed in the manner of a truncated cone around said pivot axis A1, A2. In this case, the outer wall is designed with a rounding which has the shape of an arc in cross section. Arranged in the interior 16, 16 'of the securing element 11, 11' is a fastening element 18, 18 'in the form of a snap ring or spring ring which acts on the bolt end 9, 9', in particular on the jacket surface 10, 10 'of the bolt end. How good in the Figures 6a to 6c As can be seen, the snap ring or spring ring 18, 18 'is placed in a groove 19, 19' running around the inner wall 14, 14 'of the securing element and engages in a recess or groove extending circumferentially around the bolt 8, 8' 21, 21 'of the bolt 8, 8'. In order to facilitate assembly, the snap ring or spring ring can be essentially semicircular and have an interruption (see e.g. Figure 1 ).

These fastening elements 18, 18 'serve to additionally secure the securing elements 11, 11', 12, 12 'to the bolts 8, 8' and are each preassembled in the securing elements 11, 11 ', 12', 12 '. In order to ensure simple and correct fastening of the securing elements 11, 11 ', 12, 12' to the bolts 8, 8 'as well as secure snapping of the fastening elements 18, 18' into the bolt groove 21, 21 ', the pressing devices 1, 1 are provided 'further via centering elements 27, 27', 28, 28 ', which center the securing elements 11, 11', 12, 12 'and / or the fastening elements 18, 18' on the bolts 8, 8 '. The term centering here is a correct alignment of the securing elements 11, 11 ', 12, 12' in relation to the bolts 8, 8 'as well as a correct fastening of the securing elements 11, 11', 12, 12 'by means of the fastening elements 18, 18 'to be understood both in the axial direction and in a radial direction with respect to the central axis MB of the bolts 8, 8'.

With reference to the Figures 4 to 6c these centering elements 27, 27 ', 28, 28' are explained in detail for the example of the securing element 11, 11 'in the form of the end cap.

In the case of the securing element 12, 12 'in the form of an end ring (see Figures 7-9 ) However, these centering elements 27, 27 ', 28, 28' are designed analogously, so that the following explanations apply to the pressing device 1 'according to FIGS Figures 7-9 also apply.

In the in the Figures 4 to 6c The embodiment shown, the pressing device 1 has two centering elements 27, 27 '; 28, 28 ', namely a first centering element 27, 27' in the form of a stop and a second centering element 28, 28 'in the form of a hollow body. However, it is also conceivable that the pressing device 1 only has the first centering element 27, 27 'or only the second centering element 28, 28'. The centering element 27, 27 'in the form of the stop serves to provide a stop for the fastening element 18, 18' when the securing element 11, 11 'is connected to the bolt 8, 8'. The stop 27, 27 'is formed on the inner wall 14, 14' of the securing element 11, 11 'and, starting from this inner wall 14, 14', protrudes into the interior of the securing element 11, 11 '. In the present case, the stop 27, 27 'and the securing element 11, 11' are formed in one piece. This means that the stop 27, 27 'is an integral part of the securing element 11, 11', more precisely the inner wall 14, 14 'of the securing element 11, 11'. However, it is just as conceivable to use such a stop 27, 27 'in the form of a separate component such as, for example, an insert inserted into the interior of the securing element 11, 11', this insert having a smaller inner diameter than the securing element. The inner diameter is to be understood as the clear dimension. Furthermore, the securing element 11, 11 'has a recess 29, 29' in the form of an undercut. Like in particular from Figure 5 As can be seen, the undercut 29, 29 'is, starting from the bottom surface 24, 24' of the securing element 11, 11 'in the direction of an insertion opening 13, 13' of the securing element 11, 11 ', in front of the stop 27, 27', which in turn is located located in front of the groove 19, 19 '. In other words, the stop 27, 27 'is formed between the undercut 29, 29' and the groove 19, 19 '.

The inner diameter DSIA of the securing element 11, 11 'in the area of the stop 27, 27' is smaller than the inner diameter DSIH of the securing element 11, 11 'in the area of the undercut 29, 29' as well as smaller than the inner diameter DSIN of the securing element 11 , 11 'in the area of the groove 19, 19'. The stop 27, 27 'prevents that the fastening element 18, 18 'when connecting the securing element 11, 11' to the bolt 8, 8 'can get out of the groove 19, 19' of the securing element 11, 11 '. Or, to put it another way, the stop 27, 27 'forms a counter surface for the fastening element 18, 18' and, when the securing element 11, 11 'snaps out onto the bolt 8, 8', ensures the required counter-pressure against the fastening element 18, 18 'so that the latter is not pushed away but remains in its central position and can thus safely snap into the groove 21, 21 'of the bolt 8, 8'. As in particular from the Figures 6a to 6c As can be seen, the inner diameter DSIA of the securing element 11 in the region of the stop 27 is smaller than the diameter DB of the bolt 8. If the securing element 11 is now placed on the bolt 8, the stop 27 is increasingly bent in the direction of the bottom surface 24 of the securing element 11 or bent over and received in the undercut 29. As a result, the bolt end 9 in the interior of the securing element 11 is given a space at a point in time where the secure snapping of the fastening element 18 into the groove 21 of the bolt 8 has already taken place. In this final state, in which the securing element 11 is completely connected to the bolt 8, the free bolt end 9 directly adjoins the bottom surface 24 of the securing element 11.

Instead of the stop 27, 27 'or, as here, in addition to the stop 27, 27', a centering element 28, 28 'in the form of a hollow body, which extends around the fastening element along a circumferential direction of the fastening element 18, 18', can be provided . For this purpose, the hollow body 28, 28 'has an inner diameter DSZ which is the same size or greater than the outer diameter DBA of the fastening element 18, 18'. How good in the Figures 5 to 6c As can be seen, this centering element 28, 28 'is preferably an O-ring, that is to say an elastic element with an essentially circular cross section. The O-ring 28, 28 'is also arranged in the groove 19, 19' of the securing element 11, 11 ', the O-ring 28, 28' and the fastening element 18, 18 'being concentric to one another. The O-ring 28, 28 'thus aligns the fastening element 18, 18' within the groove 19, 19 'of the securing element 11, 11' and, as will be explained below, ensures that this correct alignment is also carried out during the connection of the securing element 11, 11 'with the bolt 8, 8' is retained. A correct one Alignment of the securing element 11, 11 'attached to the bolt 8, 8' is thereby also ensured. The O-ring 28, 28 'thus centers the fastening element 18, 18'.

In the region of its ends 9, the bolt 8 has inclined guide surfaces 30 which interact with the fastening element 18 and thereby allow a guided connection between the securing element 11 and the bolt 8, see FIG Figures 6a to 6c . Starting from the groove 21 in the bolt 8 in the direction of the free ends 9 of the bolt 8, these guide surfaces 30 run against one another in the direction of the central axis MB of the bolt 8. The bolt 8 thus has a reduced cross section in the area of its free ends 9. When connecting the securing element 11 to the bolts 8, the fastening element 18 slides with its outer surface 31 along these inclined guide surfaces 30, the fastening element 18 being increasingly moved radially outward. The outer surfaces 31 of the fastening elements 18 thus serve as guide surfaces which interact with the inclined guide surfaces 30 of the bolts 8. During this movement, the fastening element 18 is pressed against the O-ring 28, the O-ring 28 being compressed due to its elastic design (see FIG Figure 6b ). In this state, both the O-ring 28 and the fastening element 18 are completely received in the groove 19 of the securing element 11, the stop 27 preventing these components from being displaced out of the groove 19. If the securing element 11 is now pushed further over the bolt 8, the fastening element 18 snaps into the groove 21 in the bolt 8 (see FIG Figure 6c ). The O-ring 28 is then again in its unpressed state within the groove 19 of the securing element 11 and prevents the fastening element 18 from moving out of the groove 21 of the bolt 8. As already mentioned, in this final state the stop 27, which was increasingly bent over while sliding along the inclined guide surfaces 30 of the bolt 8, is located in the undercut 29. In the event that the pressing device 1 has only one centering element 28 in the form of the hollow body It is conceivable to provide the securing element 1 only with the groove 19 but, for example, without a stop 27 and in particular without an undercut 29.

In the case of the Figures 6a to 6c The bolt fixation shown is located only on one side of the bolt 8 in each case a non-releasable securing element 11. However, it applies to understand that the bolt 8 in use has a securing element 11, 11 'on both sides, which prevents an axial displacement of the bolt in the carrier elements 2, 2' and in the press lever 5 on both sides.

the Figures 7 to 9 each show a further preferred embodiment of a pressing device 1 'with a bolt fixation according to the invention. The same elements are provided with the same reference symbols. Unlike the pressing device 1 in the Figures 1-6c extends in the pressing device 1 'according to the Figures 7 to 9 one bolt 8, 8 'each through the support openings 3, 3' and bearing openings 6, 6 ', which bolt is secured at the end with an annular, non-releasable securing element 12, 12' with respect to axial displacement. As can be seen in particular from these figures, this securing element 12, 12 'in the form of an end ring has an inner wall 15, 15' which has an interior space 17, 17 'for receiving the bolt end 9, 9'. Here, too, a locking part 18, 18 'in the form of a spring ring or snap ring, which acts on the bolt end, in particular on the jacket surface 10, 10' of the bolt end, is arranged in the interior 17, 17 ', which is inserted into a circumferential around the bolt 8, 8'. around extending recess or groove 21, 21 'engages or. snaps into this. The spring ring or snap ring is placed in a groove 20, 20 'of the end ring 12, 12' running around the inner wall 15, 15 '. Although not visible in the figures shown here, the end rings also have centering elements in the form of the stop and in the form of the hollow body as described above. So that the outer wall 26, 26 'cannot be grasped or cannot effectively be grasped by a pliers-like tool, the outer wall '26, 26' of the end ring is also designed here like a truncated cone around the pivot axis A1, A2 and has a rounding which, in cross section, is multi-part Bow trained.

As with the securing by means of end caps 11, 11 ', the axial displacement of the bolt 8, 8' can take place by means of an end ring 12, 12 'attached to the bolt on both sides, with the bolt passing through the carrier opening 3 of a first carrier element 2, through the bearing opening 6 of the press lever 5 and through the carrier opening of a second carrier element 2 'and is secured at its distal pin end 9 as well as at its proximal pin end 9' with a locking ring 12, 12 '.

Here, too, additional securing can be provided by the presence of one spring ring or snap ring 18, 18 'per locking ring 12, 12'. In addition, the bolt 8 is also cylindrical here and has a constant diameter DB and a full cross section over a large part of its length.

As from a comparison of the Figures 1 to 6c with the Figures 7 to 9 As can be seen, the end ring 12, 12 ', in contrast to the end cap 11, 11', does not have a bottom surface which covers the surface of the bolt end 9, 9 '. In other words, while the end cap 11, 11 'has a bottom surface 24, 24' and the parts of the bolt 8, 8 'protruding from the carrier element 2 are completely surrounded by the inner wall 14, 14', the end ring 12, 12 'encloses this protruding parts at least partially, namely completely around the jacket surface 10, 10 'of the bolt ends 9, 9', with the surfaces of the bolt ends 9, 9 'from the end ring 12, 12' remaining uncovered and free-standing.

Although not shown in the figures, the above-mentioned aspects of the pressing device can also be used with a pressing device in the form of a press sling, respectively. realize an intermediate jaw. REFERENCE LIST 1, 1 ' Pressing device 22, 22 ' Press jaw holder 2, 2 ' Support element 23, 23 ' Press contour 3, 3 ' Carrier opening 24, 24 ' Floor area 4, 4 ' Press jaw 25, 25 ' Outer wall 5, 5 ' Pressing element 26, 26 ' Outer wall 6, 6 ' Warehouse opening 27, 27 ' Stop 28, 28 'O-ring 8, 8 ' bolt 29, 29 ' Undercut 9, 9 ' Bolt end 30, 30 ' Guide surface 10, 10 ' Outer surface 31, 31 ' Guide surface 11, 11 ' Fuse element 12, 12 ' Fuse element A1, A2 Swivel axis 13, 13 ' Insertion opening M. Central axis 14, 14 ' Inner wall MB Central axis bolt 15, 15 ' Inner wall DB Diameter bolt 16, 16 ' inner space DBA outer diameter 17, 17 ' inner space Fastener 18, 18 ' Snap ring DSI inner diameter 19, 19 ' Groove Fuse element 20, 20 ' Groove DSZ inner diameter O-ring 21, 21 ' Groove

Claims (14)

1. Pressing device (1, 1'), comprising:

   - at least one carrier element (2) with at least one carrier opening (3, 3');

   - at least one pressing element (5, 5') with at least one bearing opening (6, 6') for applying a pressing force on a blank, wherein the at least one pressing element (5, 5') is mounted in a pivotable manner about at least one pivot axis (A1, A2) on the at least one carrier element (2);

   - at least one bolt (8, 8'), which extends through the at least one carrier opening (3, 3') and through the at least one bearing opening (6, 6');

   - at least one securing element (11, 11'; 12, 12'), which is connectable to the at least one bolt (8, 8') along an axial direction (A), wherein the at least one bolt (8, 8') is secured by the at least one securing element (11, 11'; 12, 12') with respect to a movement along the axial direction (A) in the at least one bearing opening (6, 6') and the at least one carrier opening (3, 3'); and

   - at least one fastening element (18, 18'), which fastens the at least one securing element (11, 11'; 12, 12') on the at least one bolt (8, 8'),

   wherein the pressing device (1, 1') comprises at least one centering element (27, 27'; 28, 28'), wherein the at least one centering element (27, 27'; 28, 28') centers the at least one securing element (11, 11'; 12, 12') and/or the at least one fastening element (18, 18') on the at least one bolt (8, 8'),
   characterized in that the at least one securing element (11, 11'; 12, 12') comprises a recess (29, 29'), wherein the at least one centering element (27, 27') is deformable and wherein the at least one centering element (27, 27'), during the connection process of the at least one securing element (11, 11'; 12, 12') to the at least one bolt (8, 8') is bent at least partially into the recess (29, 29').
2. Pressing device (1, 1') according to claim 1, wherein the at least one centering element (27, 27') is formed as a stop and during the connection process of the at least one securing element (11, 11'; 12, 12') to the at least one bolt (8, 8') provides a stop for the at least one fastening element (18, 18').
3. Pressing device (1, 1') according to claim 1 or 2, wherein the at least one centering element (27, 27') and the at least one securing element (11, 11'; 12, 12') are formed in one piece.
4. Pressing device (1, 1') according to one of the preceding claims, wherein the at least one centering element (27, 27') is arranged on an inner wall (14, 14'; 15, 15') of the at least one securing element (11, 11'; 12, 12'), and wherein an inner diameter (DSI) of the at least one securing element (11, 11'; 12, 12') is smaller in the region of the at least one centering element (27, 27') than a diameter (DB) of the at least one bolt (8, 8').
5. Pressing device (1, 1') according to one of the preceding claims, wherein the at least one securing element (11, 11'; 12, 12') comprises on its inner wall (14, 14'; 15, 15') a groove (19, 19'; 20, 20'), which extends along a circumferential direction at least partially around the at least one securing element (11, 11', 12, 12'), and wherein the at least one fastening element (18, 18') is received at least partially in the groove (19, 19'; 20, 20') of the at least one securing element (11, 11'; 12, 12').
6. Pressing device (1, 1') according to one of the preceding claims, wherein the at least one securing element (28, 28') is formed as a hollow body and at least partially surrounds the at least one fasting element (18, 18') along its circumferential direction.
7. Pressing device (1, 1') according to claim 6, wherein the at least one centering element (28, 28') has an inner diameter (DZI), which is equal to or larger than an outer diameter (DBA) of the fastening element (18, 18').
8. Pressing device (1, 1') according to claim 6 or 7, wherein the at least one centering element (28, 28') is arranged within the groove (19, 19'; 20, 20') of the at least one securing element (11, 11'; 12, 12').
9. Pressing device (1, 1') according to one of the preceding claims 6 to 8, wherein the at least one centering element (28, 28') and the at least one fastening element (18, 18') are arranged concentrically to each other.
10. Pressing device (1, 1') according to one of the preceding claims 6 to 9, wherein the at least one centering element (28, 28') is formed in an elastic manner and preferably is formed of an elastomer.
11. Pressing device (1, 1') according to one of the preceding claims, wherein the at least one bolt (8, 8') and the at least one fastening element (18, 18') each comprise a guide surface (30, 30'; 31, 31'), and wherein the guide surface (30, 30') of the at least one bolt (8, 8') and the guide surface (31, 31') of the at least one fastening element (18, 18') provide at least in some regions a guided connection of the at least one securing element (11, 11'; 12, 12') to the at least one bolt (8, 8').
12. Pressing device (1, 1') according to claim 11, wherein the guide surface (30, 30') of the at least one bolt (8, 8') is inclined with respect to a center axis (MB) through the bolt (8, 8') such that the at least one fastening element (18, 18'), during the connection process of the at least one securing element (11, 11'; 12, 12') to the at least one bolt (8, 8') is moved radially outward along the inclined guide surface (30, 30') of the bolt (8, 8').
13. Pressing device (1, 1') according to one of the preceding claims, wherein the at least one bolt (8, 8') comprises a groove (21, 21'), which extends along a circumferential direction at least partially around the bolt (8, 8'), and wherein the at least one fastening element (18, 18'), in a final state, in which the at least one securing element (11, 11'; 12, 12') is connected to the at least one bolt (8, 8'), is received at least partially in the groove (21, 21') of the bolt (8, 8').
14. Pressing device (1, 1') according to one of the preceding claims, wherein the at least one securing element (11, 11'; 12, 12') consists of a material comprising steel, and preferably has a compression strength of about 500 to 2000 N/mm², preferably of about 800 to 1600 N/mm² in the tempered state and/or an elongation at fracture of about 2 to 20%, preferably of about 5 to 15%.

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