EP1559513B1 - Pressing tool with pivotable jaws - Google Patents

Abstract

The pressing tool has a pressing fork head (1) with two opposite turning pressing jaws (2), having at least one tilting hinge (3) to create a tilting angle (4) between the jaws of 120[deg]-30[deg]. The tilting hinge includes at least one locking element enabling a preset tilting angle to be fixed. The locking element has at least one spring element and one moving bolt.

Description

The invention relates to a device comprising a pressing tongs head for producing a pipe press connection, in particular for the realization of pressing forces up to 13 tons, comprising two opposite, each pivotally arranged one another pressing cheeks each with a recess for forming an opening for receiving a pipe section. Such pressing tongs heads or pressing tools are used in particular for producing a pipe press connection with a press fitting element and a pipe which can be pushed in or pushed onto it.

The technique of pipe connection by means of threaded pipes and / or by welding or soldering, which used to be common in the sanitary and heating sector, has been replaced in recent years by a connection method called "compression technology". In this compression technique, a press fitting element with a pipe which can be inserted therein is connected to one another in an undetachable manner by pressing. For this purpose, a pressing tool, usually consisting of two pressing jaws, recognized in the open position in the connection area and made by activating a connectable with the pressing tool drive (for example, electrically or hydraulically) the pipe press connection by closing the pressing tool. The compression technology is particularly suitable for pipes with a diameter of 10 mm to 100 mm.

Due to this wide application, different pressing tools or different drives may be necessary. One of the reasons for this is that different pivoting ranges of the pressing jaws have to be realized. In addition, it should be noted that the force required to close the pressing tool proportionally increases with the dimension of the conduit to be connected. Therefore, newer drives had to be developed be where in some cases several strokes for opening and closing the pressing jaws are required. In some cases, pressing forces of up to 13 tons are realized. In addition, for a fluid-tight connection as uniform as possible force is applied over the circumference of the conduit, so that different configurations of pressing jaws are used depending on the pipes to be connected.

Especially in the domestic sanitary and heating sector, the pipe systems are laid under very tight space conditions. Now is a repair required, the pipes are difficult to reach. In the known pressing tools and the necessary drives, however, there is considerable space requirement, which requires direct accessibility to the connecting portion of the piping system. This poses a problem for many craftsmen to replace large sections of pipe or even reuse conventional joining techniques.

A known crimping pliers, for example, goes from the DE 200 16 060 U1 out. The pressing tongs are designed with two jaws, the jaws being bent over the pivoting levers. In this way, although not necessarily a vertical alignment of the pressing tongs to a conduit is required, but now a predetermined angle must always be maintained.

The DE 200 18 312 U1 and the US 2003/0230130 A1 show embodiments of pressing tongs, which are connected to the processing of the tube with a press sling. The connection between press loop and pressing tongs head can be designed as a joint. However, this two-part design of the pressing tool may be more difficult to handle and has a higher technical complexity result.

From the DE 198 26 110 A1 In addition, an electro-hydraulic device for pressing pipe connections is apparent, wherein a specially shaped housing body is designed with a handle in which the held therein cylinder tool body is rotatably mounted or rotatable with the press jaws. This tool is relatively large due to the encompassing handle design and difficult to use in confined spaces.

Another device for producing a Rohrverpressung with a Pressfittingelement goes out of the DE 100 29 761 A1 out. It is provided with a drive device arranged thereon with a pickup for inserting a pressing tool. The pressing tongs head consists of two opposing, each one pivot point pivotally arranged pressing jaws each having a recess for forming an opening for receiving a pipe section to be connected to a Pressfittingelement. To produce the pipe press connection, high pressing forces of up to 13 t must be generated. Under cramped conditions, especially in a tight running on a wall pipe, the pressing tool with its large-volume, executed pressing tongs is not applicable.

The US 5 255 579 A relates to a manually operated toggle pliers, each having a tilting joint between the front gripping part and pliers lever. But this tool is used to hold nuts, screws or the like. It is not suitable for pressing a press fitting. There are no significant holding forces transferred to detected workpieces, since these can be introduced in particular only on a difficult to handle adjusting screw in the toggle pliers. In the development of a pressing tool this area of the pliers is not considered.

On this basis, it is an object of the present invention to solve the known problems in connection with conventional pressing tools and in particular to specify a pressing tongs head or a pressing tool, which can also be used in confined spaces. At the same time a safe operation of the pressing tool should be ensured. The pressing tool or the pressing pliers head should be simple and mechanically stable.

These tasks are based on a pressing tool or pressing pliers head according to the DE 100 29 761 C1 solved with a device according to the features of claim 1 and a device with the features of claim 5. Further advantageous embodiments are formulated in the respective dependent claims.

The device according to the invention thus has according to claim 1 a pressing tongs head for producing a pipe press connection, in particular for the realization of pressing forces of up to 13 tons, comprising two opposite, each pivot around a pivotally arranged pressing jaws each having a recess for forming an opening for receiving a pipe section, wherein each press jaw has a tilting joint for generating a tilt angle and a synchronization mechanism for ensuring the same tilt angle and wherein portions of each pressing jaw are tiltable relative to each other and that a recess having part relative to the remaining part of a pressing jaw.

The pressing tongs head is usually a separately available component of a pressing tool, which optionally has different nominal diameters. With nominal diameter is meant a measure of the opening formed by the press jaws to the pipe line, so this measure also serves as an indication that which line diameter can be machined with such a pressing tongs head. A pressing tongs head usually has nominal width ranges from 10 mm to 100 mm (eg, can be used for pipes of 50-75 mm diameter) to generate a uniform, radially inward force. In addition, the Verschwenkweg the pressing jaws is kept small at the same time, so that simpler drive units can be used, which thus only allow a limitation of the pivoting movement of the pressing jaws.

Usually, the pressing jaws are in the closed state substantially parallel to each other and to each other. They each have a pivot about which they are pivotable. The pressing jaws themselves are contacted on the one hand with the pipe to be processed and on the other hand with force introduction means. This means in particular that this tool does not require a press sling or similar additional components that absorb the pivotal movement generated by the pressing jaws and even act on the pipe section to be machined. For receiving the pipe section, the pressing jaws are therefore provided with a corresponding recess, wherein both recesses together form the opening or receptacle for a pipe. The diameter of the opening in turn corresponds approximately to the diameters of the conduits to be machined, so that a possible symmetrical, radially inwardly acting force acts on the pipe section.

While known pressing tongs heads had to be aligned substantially radially or perpendicular to the pipeline, it is now possible by the installation of a separate tilting joint in each of the two pressing jaws to set the pressing tongs head in a deviating angle. The tilting joint is each designed so that it can transmit the forces occurring. The tilting joint usually has a neutral position, in which the pressing tongs head essentially corresponds to the shape of conventional pressing tongs heads. Starting from this neutral position, it is possible to divert portions of the pressing tongs head and the pressing jaws of this neutral position in one and / or other direction. In this case, a tilting area is realized, which can be easily described with the tilt angle. Although each pressing jaw has a separate tilting joint, the tilting movement of the pressing jaws is carried out coupled. Moreover, it is possible for the pressing jaws and / or the pressing tongs head to have at least one further tilting joint and / or an (unchanging) bend in order to achieve a larger tilting angle.

For a variety of applications it will be sufficient if the tilting joint, starting from the neutral position, provides a tilt angle in one direction, for example 90 °. In special applications, however, it may also be necessary that the tilting joint is tiltable in both directions with a tilt angle, starting from the neutral position, so that, for example, a total tilt angle of approximately 180 ° can be realized. If the tilting joint is in a deflected position, portions of the pressing tongs head are in a non-perpendicular position to the pipe section or not aligned with the opening of the pressing jaws for receiving the pipe section. Rather, these are for example at a 90 ° tilt parallel to the pipe section. This ensures that the pressing tongs head or the pressing tool is guided very close to the pipe section to be connected along and also under tight space conditions a press connection can be realized. By forming the tilting joints, portions of each pressing jaw are tiltable relative to each other. The position of the tilting joint in the pressing jaw is such that a part having the recess is tiltable relative to the remaining part of a pressing jaw. On the pressing jaws, a synchronization mechanism is also provided to ensure the same tilt angle. The synchronization mechanism can be realized for example by providing a connection of both tilting joints or the two pressing jaws is, so that an independent operation only one of the two tilting joints in the pressing jaw is not possible. Thus, for example, a flap, a guide pin or a similar component may be provided on a pressing jaw, which acts as a kind of driver, thus forcing the movable or tiltable part of the other pressing jaw to follow its own tilting movement. It should be ensured that this driver is still a guide even in the open or swung-out state of the pressing jaws. Of course, it is also possible to provide such drivers at other locations of the pressing tongs head, which is then preferably in contact with both pressing jaws. As a result, it is ensured even in such embodiments of the press jaws that they each act on the same pipe cross section and a liquid and possibly gas-tight press connection is generated.

According to a further embodiment of the invention according to claim 2, the tilting joint each forms a tilt angle in the range of 120 ° to 30 °. In particular, in the event that a one-sided bending of portions of the pressing tool or the pressing tongs head is only desired, a tilt angle of up to 90 ° is sufficient. The individual tilt angles can be adjusted continuously, but it is also possible that only certain tilt angles, for example at equal intervals of 30 °, are adjustable.

According to an advantageous embodiment according to claim 3, the tilting joint comprises at least one locking element for fixing at least one predetermined tilt angle. Especially in the event that no continuous adjustment of the tilt angle is predetermined, it is useful to ensure an exact positioning of the mutually tilted portions of the pressing tool or the pressing pliers head. For this adjustment or adjustment aids may be provided, such as by means of at least one locking element. The latching element engages with corresponding recesses of the pressing tool when a certain Tilt angle has been reached. In general, the latching element can be an element of the tiltable part or of the stationary part of the pressing tool, wherein a corresponding latching possibility is provided in the respective other part. The locking element also ensures that this tilt angle is not changed during the processing of the pipe section.

It is particularly advantageous that, according to claim 4, the at least one locking element has at least one spring element and a movable pin, so that the bolt with the spring element is deflectable towards a depression of the tilting joint. In this way, a kind of latching closure is formed, which locks the tilting joint in a certain position or with a certain tilt angle. The term "bolt" includes a multiplicity of different form elements which are suitable for carrying out such a latching function, for example also balls, projections, latching noses, etc. This bolt is movably arranged, that is to say in particular displaceable relative to partial areas of the tilting joint. If the desired position of the tilting joint or the predetermined tilt angle is reached, the bolt is pressed with the spring element in a depression and forms a positive connection or adhesion there. This ensures that further tilting is prevented without additional measures. The depression preferably has a contour which is adapted to the bolt.

The provision of the tilting joints directly in the pressing tongs head has the advantage that these pressing tongs heads can be placed on conventional pressing tools or combined with them. Thus, a spare part is proposed in a simple manner, which complements the conventional pressing tools. To ensure that the tilting joints in the press jaws each have the same Kippwinkelstellung, appropriate means must be provided.

According to a further aspect of the invention according to claim 5, a device comprising a pressing tongs head according to one of the preceding claims 1-4, and a drive unit for effecting the pivoting movement transverse to an axis. Each of the two pressing jaws has, in addition to its pivot joint, a tilting joint for generating a tilting angle. A drive unit is in particular to be understood as one which applies the force required for pivoting the pressing jaws by means of an electric or hydraulic drive unit. In this case, a force is usually generated along the axis, which is then converted to the pivoting movement. At least one separate tilting joint is formed with the pressing jaws. Other tilting joints may e.g. be provided on the pressing tongs head. With regard to further capabilities or design variants of the tilting joint, reference is made to the corresponding facts of the tilting joint of the pressing pliers head.

It is also proposed according to claim 6, that the pressing tool has a releasable connection mechanism for the pressing tongs head. This makes it possible that in each case suitable for the application case pressing tongs heads can be connected to the pressing tool, which thus have, for example, the corresponding nominal size. As a releasable connection are especially screw or snap on. Other locking systems can be used under certain circumstances.

According to one embodiment of the pressing tool, according to claim 7, this has a drive unit with a reciprocating piston, which causes the pivoting movement of the pressing jaws. The reciprocating piston can be operated hydraulically or electrically. The linear movement of the reciprocating piston is transferred by suitable means in the pivoting movement of the pressing jaws. The power transmission or the transmission of the pivoting movement takes place via the tilting joint. According to claim 8 is the re-releasable connection mechanism of the pressing tongs head connected with an adapter and a transducer with the form of a lifting piston drive unit.

Fig. 1,2

schematisch in einer Draufsicht und in einer Seitenansicht eine Ausführungsvariante des erfindungsgemäßen Presswerkzeuges mit einer Vorrichtung aufweisend einen Presszangenkopf,

Fig. 3,4,5

schematisch und in einer Draufsicht sowie einer Seitenansicht eine Ausführungsvatiante eines Presszangenkopfes,

Fig. 6

schematisch die Darstellung des Synchronisationsmechanismuses des Presszangenkopfes, und

Fig.7

schematisch ein Anwendungsbeispiel für eine Presszange mit einem Kippgelenk in den Pressbacken.

The invention and the technical environment will be explained in more detail with reference to the figures. In the figures, particularly preferred embodiments of the invention are shown, but the invention is not limited thereto. Show it:

Fig. 1.2

schematically in a plan view and in a side view of an embodiment of the pressing tool according to the invention with a device comprising a pressing tongs head,

Fig. 3,4,5

schematically and in a plan view and a side view of an embodiment of a pressing tongs head,

Fig. 6

schematically the representation of the synchronization mechanism of the pressing tongs head, and

Figure 7

schematically an example of application for a pressing tongs with a tilting joint in the pressing jaws.

Fig. 1 and 2 show schematically and in two views a pressing tool 5, which is used for connecting pipes. In the Fig. 1 (Top view) is the tilting joint 3 and the tilt angle 4 can be clearly seen with it. The tilting joint 3 is part of the pressing tongs head 1, which is connected via a connecting mechanism 13 with an adapter 15 and further via a receiver 16 with the trained as a reciprocating piston 14 drive unit. The adapter 15 allows the inclusion of different configurations of the pressing tongs head 1, for example, depending on the used reaching Drive unit 6 or the resulting power transmission to the pressing tongs head 1. Off Fig. 1 It can be seen very well that the pressing tool 5 extends substantially along an axis 7. If a tube section to be connected is now to be arranged between the pressing jaws 2 of the pressing tongs head 1, previously this axis 7 had to be aligned essentially perpendicular to the axis of the pipeline. The tilting joint 3 now offers the possibility of allowing a deviating orientation of the pressing tool 5 to the (not shown) line section. Out Fig. 2 (Side view) it can be seen that the pressing tool 5 has a handle 18 with a switching lever 17 for activating the drive unit 6. Accordingly, the pressing tool 5 is to be operated with one hand. The drive unit 6 is designed with a reciprocating piston 14 which generates a force in the direction of the axis 7. This is transmitted via the pickup 16 and the adapter 15 to the pressing jaws 2 of the pressing pliers head 1, so that this allows the indicated with black arrows pivoting movement for opening and closing the oppositely arranged pressing jaws 2. The so-designed pressing tool 5 is very handy and flexible.

The 3 and 4 also show in two different views a variant of the pressing pliers head 1. The pressing pliers head 1 in turn extends substantially in a plane which can be characterized by the axis 7. While in Fig. 1 and 2 a neutral position of the tilting joint is shown in the Fig. 3 a 90 ° angled position of the pressing jaws 2 shown. With the help of the tilting joint 3 thus the tilt angle 4 of 90 ° (degrees) is realized. Consequently, the pressing tongs head 1 is now to be aligned substantially parallel to the pipe section (not shown) to be connected. The side view ( Fig. 4 In this case, each pressing jaw 2 has a kind of hinge joint, wherein the two tilting joints 3 despite each separate shafts 20 operable only in synchronism with each other are, as outside drivers 21 are provided which ensure a smooth, smooth and synchronous tilting of the pressing jaws 2. This synchronization mechanism 12 is thus formed with drivers 21, which are provided on both sides of a pressing jaw 2. In addition, it is also possible that the tilt angle is preset via a respective adjusting wheel 19, so that the shafts 20 of the tilting joints 3 have a matching orientation or orientation.

In Fig. 5 As a detail, the embodiment of a locking element 8 is illustrated. For this purpose, the shaft 20, which is not only movably mounted along its extension axis, but also can also rotate, designed with a bolt 10 which is locked at certain angular positions by means of a spring element 9 in the recess 11 of the tilting joint 3. To release this lock, the shaft 20 is to move against the force of the spring element 9 by means of the adjusting wheel 19 upwards and twist. Such depressions 11 or spring elements 9 can be provided in different angular positions.

In Fig. 6 schematically another embodiment of the pressing tongs head 1 is shown with a synchronization mechanism 12, which is realized with both sides of a press jaw 2 arranged drivers 21. The driver 21 (wherein only one is shown in the foreground) are each secured via a (one-sided) attachment 22 on a Pressba bridge 2. Since the drivers 21 extend into the region of the other pressing jaw 2, they serve as a kind of guide. If the pressing jaw 2, shown below, tilts in its separate tilting joint 3, then at least one driver 21 comes into contact with the other pressing jaw 2 and thus ensures that it is likewise tilted in the same way. Thus, a substantially aligned alignment of the two pressing jaws 2 can be ensured.

Figure 7 shows schematically an application example of a pressing tongs with a tilting joint 3 in the pressing jaws 2. Shown is a wall 24 from which a tube 25 exits, wherein the tube 25 is formed bent near the wall and then arranged substantially parallel with a small distance 23. The known pressing tongs are often designed relatively large volume, so that a vertical attachment of the pressing tool parallel to the wall 24 may be problematic. Here, the pressing pliers head 1 according to the invention now offers a preferred application, as by means of the tilting joints 3 an oblique attachment of the pressing tool is made possible, while ensuring that the pressing jaws 2 are aligned at an angle 26 of 90 ° during the pressing process.

The pressing tool described here or the pressing tongs head allows a connection of pipes, the tool is very flexible and easy to use even in confined spaces.

LIST OF REFERENCE NUMBERS

1

Press pliers head

2

pressing jaw

3

tilting joint

4

tilt angle

5

press tool

6

drive unit

7

axis

8th

locking element

9

spring element

10

bolt

11

depression

12

synchronization mechanism

13

joint mechanism

14

reciprocating

15

adapter

16

pickup

17

gear lever

18

handle

19

thumbwheel

20

wave

21

takeaway

22

attachment

23

distance

24

wall

25

pipe

26

angle

Claims (9)

1. Device having a pressing clamp head (1) for producing a pipe compression joint, in particular for realizing pressing forces of up to 13 tonnes, comprising two opposing pressing jaws (2) disposed pivotably about in each case one pivot point relative to one another and each having a recess to form an opening for receiving a section of pipe, characterized in that each pressing jaw (2) has a tilting joint (3) for producing a tilting angle (4) and a synchronizing mechanism (12) is provided for ensuring the same tilting angle (4), wherein subregions of each pressing jaw (2) are tiltable relative to one another, namely a part having the recess relative to the remaining part of a pressing jaw (2)
2. Device according to claim 1, characterized in that the tilting joint (3) forms a tilting angle (4) in the region of 120° to 30°.
3. Device according to one of the preceding claims, characterized in that the tilting joint (3) comprises at least one detent element (8) for fixing at least one predetermined tilting angle (4).
4. Device according to claim 3, characterized in that the at least one detent element (8) has at least one spring element (9) and a movable bolt (10), so that the bolt (10) can be deflected by the spring element (9) in the direction of a depression (11) of the tilting joint (3).
5. Device having a pressing tool (5), comprising a pressing clamp head (1) according to one of the preceding claims as well as a drive unit (6) for effecting the pivoting movement transversely of an axis (7).
6. Device according to claim 5, characterized in that it has a releasable connecting mechanism (13) for the pressing clamp head (1).
7. Device according to claim 5 or 6, characterized in that the drive unit (6) comprises a reciprocating piston (14) that effects the pivoting movement of the pressing jaws (2).
8. Device according to claim 7, characterized in that the releasable connecting mechanism (13) of the pressing clamp head (1) is connected to an adapter (15) and is further connected by a receiver (16) to the drive unit (6) configured as reciprocating piston (14).
9. Use of a device according to one of claims 5 to 8 to produce a pipe compression joint in pipe systems in the sanitary- and heating sector, in particular to realize pressing forces of up to 13 tonnes.

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