Press tool

The invention relates to a method for manufacturing a pipe joint according to the preamble of claim 1 and a combination according to the preamble of claim 2. Such a method and Such a combination is known from DE-A-2,118,782th

To connect the pipe ends coupling sleeves are used which are plastically deformable and made from metal, preferably from Steel. Its inside diameter is so much larger than the outer diameter of the pipe ends to be joined, that they at radial compressibility to abut the shell surface the tube ends are permanently deformed. After DE-PS 11 87 87⊘ can such coupling sleeves on their inside in the vicinity of each end, in addition have an annular groove, in which an elastic sealing ring is inserted.

The radial compression is done by means of pressing tools, as are known for example from DE-PS 21 36 782nd This pressing tool has two each with two arms formed Clamping jaws, of which at least one pivotally mounted to the Press tool is mounted. The cheek plates have circular arc portions forming pressure surfaces on with equal radii Include a baling chamber. Instead of a circular arc portions may also be contoured to press surfaces, for example, to form a polygonal or oval baling chamber.

The press room the distant arms of the cheek plates can are spread against the action of a spring, with the result that the press jaws in the region of the baling chamber is moved to today will. The spreading is done by means arranged side by side and abutting pressure rollers together by means of a drive device in the form of a working cylinder be driven between the arms and in this way the Cheek plates pivot.

Further development of this press tool is the press tool according to the preamble of claim 1 is and is in DE-OS 34 23 283 describes. are at this press tool two compression jaws are provided, each on a drive lever are pivotably mounted, which in turn pivotally mounted to the Pressing tool are guided. The drive lever have opposed Arms which in means of a working cylinder to Gap retractable press wheels can be spread and the cheek plates move towards each other in this way. The Pressing jaws are additionally performed in scenes such that upon pivoting of the drive lever in the opening direction be pivoted about its hinge points to the drive levers, so that between the end faces of the cheek plates a wide, mouth-like opening is formed, connecting to the inclusion of Pipe ends and a coupling sleeve easier.

Upon pivoting of the drive lever in the reverse direction the clamping jaws are pivoted back so that the bisectors each other fall on their arc sections in about and the jaws during the further pivoting of the Antriebshebei be moved parallel to today. During the pressing process the clamping jaws are moved further towards each other, to enclose a circular area on the pressing end and thereby the Pipe ends and the coupling sleeve in accordance with reduction in diameter have deformed.

This pressing tool has proven desirable if a not too large Reduction in diameter or depth of pressing is required. at larger offsets that are required when the Pipe connection should withstand higher internal pressures, it is necessary to provide more than two pressing jaws, so that it between the end faces of the cheek plates not to form comes from outwardly projecting webs which complete a would prevent closing of the pressing jaws. Such dies for example in the DE-OS 21 18 782, DE-OS 35 13 129, DE-AS 25 11 942 and DE-AS 19 956 ⊘7 described. Allen disclosed in press tools have in common is that all are guided pressing jaw movable and in the radial direction. This requires elaborate guides and drive means, whereby the dies hard and therefore difficult to handle and furthermore also are expensive.

In DE-C-11 98 147 and US-A-2973 ⊘24 is an assembly tool described which should serve a hose end with to connect an inserted spout. For this purpose, the Hose end jaws on, with the aid of the assembly tool radially inwardly under compression of the hose end be moved. In the end position, via the clamping jaws a clamping ring to be pushed, and the the jaws so the hose end and the grommet hold together when the assembly tool is removed.

The invention has the object of providing a method and a combination of to make the aforementioned type so that, in spite of the arrangement of more than two press jaws as simple and thus easy to handle and inexpensive to produce formed is.

This object is achieved according to the features of claims 1 and 2 dissolved.

This opens up the possibility of the drive device (s) form separate from the pressing ring and the Drive device (s) and the pressing ring with coupling elements equip, over which it is operatively connected to each other can be brought. The mold is then formed in two parts, wherein the first press ring placed around the workpiece and Then, the driving means is attached to the press ring. The mold is very advantageous in its handling since the items have a much lower weight and independently are different from each handle.

The press ring, at least one on the outside of at least the movable pressing jaws fitting drawstring have, over the or the press jaws zusammenbewegbar, for which purpose two drawstrings may be provided. This version is particularly weight- and cost-saving.

Finally, it is provided according to the invention that the press jaws are formed in the circumferential direction of the same length, so that the gaps between the respective opposite end faces the pressing jaws are uniformly distributed over the circumference.

In the drawing, the invention by means of embodiments illustrated in more detail. Show it:<dl tsize="8"><dt>figure 1</dt><dd>each half illustration of two pressing tools in the open position;</dd><dt>figure 2</dt><dd>the dies according to Figure 1 in the closed position.</dd></dl>

In Figures 1 and 2, two dies 91, 92 are shown, in each case in half. On the axis of symmetry left-hand half of Figures 1 and 2, the press tool 91 and the press tool 92 shown on the right half of each. Both dies 91, 92 are formed in mirror symmetry, so that their construction has made the presentation of their halves results.

The press tool illustrated in the left-hand halves of Figures 1 and 2 91 has a pressing ring 93 on which a total of three Cheek plates 94, 95, said because of the half-page display the cheek plate 94 only partially and a press jaw - Namely, the right - are not at all to see. At the upper cheek plate 94 is by means of a screw 96, a spring steel existing, flexible tension band 97 attached to the about the periphery of the top press jaw 94 and the left pressing jaw 95 extends. A corresponding tension band extends to other, not shown side of the press ring 93rd

The lower cheek plates 95 are displaced in the circumferential direction K performed on the drawstrings 97th In each case a rubber spring 98 construed in recesses in the opposing end faces of the Pressing jaws 94, 95 and is vulcanized to the latter. In unloaded State, the press jaws 94, 95 by the rubber springs 98 urged apart by a certain amount, so that between the opposite end faces of the press jaws 94, 95 column 99, 1⊘⊘ equal width arise when the press jaws 94, 95 externally applied on a coupling sleeve 1⊘1.

At the free ends of the drawstrings 97 are externally coupling approaches 1⊘2 attached. These can clutch approaches 1⊘2 drive means only schematically and dot-dashed be 1⊘3 stated that of the press ring 93 is isolated. The mold 91 thus consists of two independent Parts which can be coupled together.

The drive means 1⊘3 has two driving levers 1⊘4, of which only the left can be seen. You are at right angles to the plane extending pivot pin 1⊘5 rotatably mounted. be your downward arms 1⊘6 spread for pivoting in the direction of arrow L, namely against the action of a not illustrated here, the lower arms 1⊘6 puckering spring. To spread the arms 1⊘6 a pair of pressure rollers is used, the one with the aid of pneumatically or hydraulically loadable working cylinder in the space between the arms 1⊘6 be retracted. A Such a drive device is known per se from the DE-C 21 36 782 and DE-OS 34 23 382.. The from the Pivot pin 1⊘5 upwardly extending arms 1⊘7 are shaped that it approaches the clutch 1⊘2 can engage behind.

In use of the die 91 is first the press ring 93 opened, so that the lower press jaws 95 protrude outward, as is shown in phantom. The press ring 93 can then use the combination of coupling sleeve and 1⊘1 Pipe end are 1⊘8 pushed transverse to the longitudinal axis thereof. by virtue of the spring action of the drawstrings 97 put the press jaws 94, 95 on the circumference of the coupling sleeve 1⊘1 to, namely also here only with the outer transverse edges. Then, the driving means is 1⊘3 such recognized that the upper arms 1⊘7 the drive lever 1⊘4 the clutch approaches 1⊘2 outside behind grasp how this can be seen in FIG. 1 The drive lever 1⊘4 or arms 1⊘6 are then in the above apart manner such that the drawstrings 97 at their free ends are compressed. This has the consequence, that the coupling sleeve 1⊘1 and the pipe end 1⊘8 be radially compressed, wherein the lower cheek plates 95 automatically circumferentially move, namely the lower left cheek plate 95 clockwise and the lower right cheek plate counterclockwise. This continues until the end faces of the press jaws 94, 95 with each other come to rest, the rubber springs compress 98th This situation is shown in Figure 2 shown.

The mold 92 is operatively arranged similarly the press tool 91. It also has a wraparound ring 1⊘9, the three press jaws 11⊘, has 111 same arc length. The upper Press jaw 11⊘ is fixed at one Preßbackenträger 112 while the two lower cheek plates 111 in the circumferential direction are slidably guided on Preßbackenträgern 113th The lower Preßbackenträger 113 are at about pivot joints 114 the upper Preßbackenträger 112 articulated.

The lower cheek plates 111 are provided at their outer peripheries Notches 115 in the bottom in the Preßbackenträgern 113 axially displaceably mounted pins 116 border. These Pins 116 are compression springs 117 toward the notches 115 spring-loaded. The pins 116 and the notches 115 are arranged such that the pins 116 strives are, the lower cheek plates 111 in the circumferential direction against each other to move, so the right illustrated lower Pressing jaw 111 in a clockwise direction and not shown here Cheek plate counterclockwise. shown here unspecified Stops ensure that the lower cheek plates 113 a certain maximum dimension also not in these two directions can be moved.

At the free ends of the lower Preßbackenträger 113 are perpendicular arranged to the plane projecting drive pins 118, the function of the coupling lugs on the pressing tool 1⊘2 91 take over. On this drive pin 118 in the can the left half of the figures 1 and 2 illustrated drive means be 1⊘3 recognized by the upper arms of 1⊘7 Drive lever 1⊘4 applied to the outer sides of the drive pin 118 will.

The pressing tool 92 is handled in the same manner as the press tool 91. First, the press ring 1⊘9 about is Coupling sleeve and the pipe end 1⊘1 1⊘8 transverse to the longitudinal axis pushed, wherein the two lower Preßbackenträger 113 open, that are turned outwards, as dash-dot is indicated. Thereafter, the lower Preßbackenträger be 113 1⊘1 placed on the outer periphery of the coupling sleeve to the plant. The aforementioned stops for limiting the movement the lower cheek plates 111 are circumferentially arranged, that when in contact with the coupling sleeve 1⊘1 equal Column 119, 12⊘ between the faces of the cheek plates 11⊘, 111 result.

Through further spreading of the lower arms 1⊘6 the drive lever 1⊘4 the lower cheek plates are pivoted 113 inwardly, wherein the lower cheek plates 111 automatically in the circumferential direction M move, namely the illustrated right cheek plate 111 counterclockwise and the left, not here illustrated press jaw in a clockwise direction. This goes until the faces of the cheek plates 11⊘, 111 at the pressing end to rest come. This state is shown in the right half of Figure (2) to see.

Of course, the dies 91, 92 in one piece be formed, ie, the drive device via 1⊘3 a corresponding housing part with one of the cheek plates 94, 95 be 11⊘, 111 connected. In this case would be the respective pressing jaw 94, 95, 11⊘, 111 compared with an abutment, wherein the press jaws 94, 95, 11⊘, 111 during the pressing process each toward the center of the baling chamber in closed State of the pressing tool 91, moving 92nd It can also be a the lower cheek plates 95, 111, the fixed position on the pressing tool 91, 92 arranged, the function of the abutment exerting pressure clamp 95, 111 be. In this case, it requires only one driving lever 1⊘4 for contracting the cheek plates 94, 95, 11⊘, 111th