EP1208949B1 - Crimp pressing tool - Google Patents

Abstract

A pressing tool for pressing pipe ends, and in particular, ends of pipe to be laid for sanitary purposes. The pressing jaws of the tool are connected to one another in an articulated manner, each jaw having an insert that has a circle-like-configuration in the area of interaction between the respective jaws.

Description

The invention relates to a pressing tool according to the features of the preamble of claim 1.

Such a pressing tool is from the EP 0627273 B1 known. The press inserts of this known, three pressing jaws having pressing tool have between them a plurality of uniform movement gaps, which are arranged in a star shape to each other.

From the not pre-published DE 19924086 A1 is a press tool with press jaws and press inserts known.

The invention is based on the object, a pressing tool, as for example from the EP 0627273 B1 is known to develop in an advantageous manner.

This object is achieved by the subject matter of claim 1, wherein it is pointed out that the pressing tool has two pressing jaws which complement each other to form a closed pressing geometry and that the contact of the pressing inserts and the movement gap are formed opposite one another.

According to this embodiment, a pressing tool is specified, which is also suitable for carrying out a pressing of pipe ends with a larger diameter by means of two pressing jaws. This is given by the floating support of the press inserts in the two pressing jaws, as a result, the press inserts are movable relative to the associated pressing jaws in the circumferential direction. In the course of the pressing process The facing first ends of the press inserts come to rest, while this system opposite forms the movement gap between the second ends. Specifically, it is provided that the system of the press inserts and the movement gap are aligned diametrically opposite one another on an axis of symmetry of the pressing jaws which supplement one another to form a closed pressing geometry. It is further preferred that the movement gap between the second ends of the pressing inserts remains an associated joint formation of the pressing tool which connects the pressing jaws. Accordingly, it comes at the opposite ends of the press inserts to the plant of the same. Alternatively, however, the investment of the inserts in the area of joint training can take place, in which case the movement gap remains opposite to this Gelenkausformung. Further, it is preferable to assign each pressing jaw a movable in the circumferential direction of the press insert. In an advantageous manner, a pressing device, for example a hydraulic pressing device, acts on the free ends of the pressing jaws opposite the joint formation, wherein the pressing inserts are further supported in an unloaded basic position in the pressing jaws in such a way that they are in contact with their first, facing ends via the free ends Protruding end faces of the pressing jaws, so that these free ends come in the course of the pressing process first to the plant. As the pressing process continues, the press inserts supporting each other in the area of the first ends move relative to the pressing jaws, which results in closing of the movement gap opposite the installation.

In order to develop a pressing tool of the type in question in an advantageous manner, it is proposed that the press inserts are releasably latched operationally. Advantageously, therefore, the press inserts are optionally without tools, but at least without special tools in the simplest way to solve from the press jaws, with each further Press insert is individually interchangeable. It proves to be particularly advantageous in this case that the release of the press inserts without disassembly of the latching holder and further without the locking elements to solve, for example, unscrew, can take place. According to this embodiment of the invention, a change of the press inserts, preferably without tools use in the simplest way possible. In this regard, it is further proposed that for holding two on a pressing jaw radially inwardly and at a radial oriented inside over the pressing jaw projecting, spaced apart in the direction of circular pins are provided which engage in associated holes of the press inserts, of which at least one to remove the Press insert is movable out of this. This moving out can take place, for example, by means of a handle connected to a first pin in the radial direction. Further, a hand-operated pivoting of the first pin from the detent holder is conceivable. In addition, it is provided in a preferred embodiment of the subject invention that in a pressing tool with two complementary to a closed pressing geometry pressing jaws, the two arranged in each jaw pins each include an acute angle to the associated, the front side of the other jaw facing end face, so more preferably one Angle of 15-45 °. It also proves to be particularly advantageous that this holder according to the invention can serve both for the latching receptacle of a floating, ie in the circumferential direction relative to the pressing jaw movable press insert, as well as the locking receptacle of a fixed press insert. In the case of floating press inserts, the press jaws have bores for the locking pins which allow the desired mobility, for example, bores whose diameters are larger, for example twice as large as the pin diameter, or oblong holes. The features described above prove to be advantageous both individually and in combination.

It is further proposed that the movement gap initially remains in the region of a joint connection of the pressing jaws, ie opposite the loading side of the pressing jaws by the pressing tool. Alternatively, it is proposed in this regard that the movement gap initially remains in the region of the unconnected ends of the pressing jaws, ie in the region of the loading of the pressing jaws by the pressing tool. The pressing jaws can be designed here as at least partially detachable from the pressing tool pressing members. In this regard, it is further proposed alternatively that the pressing jaws are formed in mouth sections of the pliers legs of the pressing tool. As a result, a one-piece design of pressing jaws and pliers limbs is selected, which pressing jaws are shaped to receive press inserts. In the usual way, the pliers legs of the pressing tool are hingedly connected by means of tabs. In this regard, it is proposed in a further development of the subject invention that the first pin, which can be moved out of the press insert, is arranged, facing away from the tongue, of the mouth opening. Alternatively, this, the release of the press insert causing first pin can also be arranged in the end of the press jaw facing away from the tongue. It is also proposed that, facing the lug, a second pin which can not be moved out is arranged, which according to the alternative described above can also be positioned in the region of the pressing jaw facing away from the tongue. In addition, it is provided that the second, not herausbewegbare pin is pivotally mounted in the press jaw, wherein the longitudinal axis of the pin passes through the hinge. In this case, the pivot axis preferably extends in the closed position, ie in the pressing position, parallel to the pressing jaw axis formed in the region of the pressing jaws or the pressing inserts. In order to ensure the specified oscillating mounting of the insert to be received in the pressing jaw, it is provided that the second jig is a circumferentially extending slot the pressing jaw interspersed. In this regard, it is further proposed that the second pin is spring-biased against one end of the elongated hole. To remove the press insert from the press jaw, the first pin can be moved out of the associated bore or engagement opening of the press insert. For this purpose, the first pin may have a handle for the displacement of the first pin against a spring force in the axial direction of the same, so for example. By, based on the press insert extension, radially oriented train-back displacement of the first pin. Alternatively, it is proposed that the first pin is formed on a rocker, which rocker is formed as a handle. In this regard, it can further be provided that the end facing away from the first pin end of the rocker is spring-supported in the press jaw, for the automatic return displacement of the first pin in the engaged position.

A press insert may have on the inside a portion of first curvature and a tongue-like portion of a second curvature, which protrudes unclaimed, in any case inwardly beyond the portion of the first curvature. With a press tool with two press jaws and two associated press inserts, pressings with nominal diameters over 50 can be carried out. From the state of the art more than 50 pressing tools are known for performing pressings with nominal widths which have three or more pressing jaws or pressing inserts. Furthermore, results from the inventive design of the press insert, the advantageous effect that in the course of compression of the tongue-like portion second curvature upon reaching a pressing force of, for example. 500 kg in the, the first curvature following position is shifted and that when lifting the application of force Spring-back of the tongue-like portion second curvature causes lifting of the press insert from the compact.

It is also suggested that the press insert has two circumferentially offset engagement holes for support pins. Thus, the press insert is releasably releasable in press jaws of a pressing tool rasthalterbar. In an advantageous development, it is provided that the tongue-like section of the second curvature is cut free from the section of the first curvature, wherein furthermore the tongue tip is arranged eccentrically with respect to a circumferential extension of the press insert. Further, the tongue-like portion has a width which is smaller than the width of the press insert. Further alternatively or in combination with the solution described above, it can be provided that the press insert has two offset across the width engagement openings for support pin. In this case, an embodiment is preferred in which the engagement openings are mirror-symmetrical with respect to a circumferential bisector. The engagement openings may be formed in the form of holes or elongated holes. However, it is preferred here that one or both engagement openings are blind holes.

Fig. 1

ein erfindungsgemäßes Presswerkzeug in einer partiell geschnittenen Ansichtsdarstellung;

Fig. 2

das Presswerkzeug in einer perspektivischen Explosionsdarstellung;

Fig. 3

einen Presseinsatz des Presswerkzeuges in Ansicht;

Fig. 4

den Schnitt gemäß der Linie IV-IV in Fig. 3;

Fig. 5

eine Detailvergrößerung des Bereiches V-V in Fig. 4;

Fig. 6

den Schnitt gemäß der Linie VI-VI in Fig. 4;

Fig. 7

die Draufsicht auf das Presswerkzeug unter Fortlassung der auf dessen Pressbacken einwirkenden Spannvorrichtung;

Fig. 8

den Schnitt gemäß der Linie VIII-VIII in Fig. 7, die geöffnete, unbelastete Grundstellung des Presswerkzeuges darstellend;

Fig. 9

eine Folgedarstellung der Fig. 8 in Zuge eines Verpressvorganges;

Fig. 10

eine weitere Folgedarstellung, den vollendeten Verpressvorgang betreffend;

Fig. 11

eine der Fig. 8 entsprechende Darstellung, jedoch bei geöffnetem Presswerkzeug;

Fig. 12

eine Ausschnittdarstellung einer oberen Pressbacke, die Entnahmestellung des zugeordneten Presseinsatzes darstellend;

Fig. 13

eine der Fig. 8 entsprechende Darstellung, jedoch bei Verwendung von Presseinsätzen in einer zweiten Ausführungsform,

Fig. 14

eine der Fig. 1 entsprechende Darstellung, eine weitere Ausführungsform betreffend.

The invention with reference to the accompanying drawings, which illustrate only exemplary embodiments, explained in more detail. It shows:

Fig. 1

an inventive pressing tool in a partially sectioned view representation;

Fig. 2

the pressing tool in a perspective exploded view;

Fig. 3

a press insert of the pressing tool in view;

Fig. 4

the section according to the line IV-IV in Fig. 3 ;

Fig. 5

a detail enlargement of the area VV in Fig. 4 ;

Fig. 6

the section according to the line VI-VI in Fig. 4 ;

Fig. 7

the top view of the pressing tool, omitting the force acting on the clamping jaws clamping device;

Fig. 8

the section according to the line VIII-VIII in Fig. 7 representing the open, unloaded home position of the press tool;

Fig. 9

a following presentation of the Fig. 8 in the course of a pressing process;

Fig. 10

a further sequence, regarding the completed pressing process;

Fig. 11

one of the Fig. 8 corresponding representation, but with open pressing tool;

Fig. 12

a detail view of an upper die, representing the removal position of the associated press insert;

Fig. 13

one of the Fig. 8 corresponding representation, however, when using press inserts in a second embodiment,

Fig. 14

one of the Fig. 1 corresponding representation concerning a further embodiment.

Shown and described is first with reference to FIG. 1 a pressing tool 1, which consists essentially of a press die 2 and a clamping device 3 composed. The pressing die 2 consists essentially of two identical pressing members 4, which are connected at one end via a joint formation 5 with each other.

Each pressing member 4 consists essentially of two circular section-shaped, d. H. to achieve a closed pressing geometry complementary semi-circular pressing jaws 6 and held over these press inserts. 7

The joint formation 5 is achieved by one, a free end of a pressing jaw 6 passing through hinge pin 8, via which hinge pin 8 by means of tabs 9 a pivotally movable connection of the pressing jaws 6 is reached.

At the opposite ends of the joint formation 5, the pressing jaws 6 likewise have the same cross-section to the circular section extension, the bolts 10, 11 passing through the pressing jaws 6.

The tensioning device 3 consists essentially of two pliers legs 12, which are connected to tabs 13. A pliers leg 12 is in this case connected to the bolt 10 of the die 2, including the, the die 2 associated end of the pliers leg 12, the bolt 10 fully encloses. The other pliers leg 12, however, is semicircular open for receiving the other pin 11, so that a simple assembly is made possible by hooking.

Between the pliers legs 12 13 cylindrical pins 14 are provided in the region of these connecting tabs, which ensure an approximately symmetrical closing movement of the pliers legs 12.

The closing movement is driven by a drive machine, of which only the cam rollers 15 are shown, such that the cam rollers 15 inwardly against the inner side formed on the pliers legs 12 cam tracks for spreading the this side pliers leg ends. As a result, the legs 10 and 11 of the squeeze die 2 are urged toward each other.

The two pressing jaws 6, which are mirror-symmetrically arranged and formed, bear on the inside, the compact adapted circular segment-shaped press inserts 7. The latter are positively retained by spaced apart in the direction of the circle pins 16, 17 in the pressing jaws 6 latched (see, for example. Fig. 8 ).

These pins 16, 17 of each pressing jaw 6 are each oriented at a radial oriented and protrude radially inward into the press application area. The press insert 7 has correspondingly assigned, both over the circumference and over the width mirror-symmetrically offset shaped engagement openings 18, in which the pins 16, 17 engage. To remove a press insert 7, a first pin 16 is movable out of the associated engagement opening 18 of the press insert 7, to which this first, the tabs 13 of the clamping device 3 facing pin 16 via a hand-operated rocker 19 about a transversely to the circular extent of the pressing jaws 6 aligned axis 20th is schwenkverlagerbar. This, in the pressing jaw 6 pivotally mounted rocker 19 is biased against a compression spring 21 in the basic position, ie in the detent position. Furthermore, the rocker 19 can be actuated from radially outward. How out Fig. 12 can be seen after an operation and an associated shifting back of the associated first pin 16 of the press insert 7 in the simplest manner from the pressing jaw 6 can be removed.

The second, the tabs 13 of the clamping device facing away from pin 17 may be formed to achieve such a holder fixed. However, the solution shown offers the possibility of both the recording of a fixed, ie immovable to the pressing jaw 6 press insert 7 FIG. 13 as well as for holding a floating, ie in the circumferential direction relative to the pressing jaw 6 movable press insert 7 according to the embodiment in the FIGS. 1 to 12 ,

For this purpose, the second pin 17 is pivotally mounted about an axis 22 supported in the pressing jaw 6 and, by means of a tension spring 23, in its basic position FIG. 8 biased. In order to ensure the pivoting mobility of the second pin 17, the passage opening facing the press insert 7 is shaped correspondingly on the inside of the press jaw 6, for example in the form of an elongated hole 24 extending in the circumferential direction.

When using a fixed press insert 7 according to FIG. 13 are engagement openings 18 for receiving the pins 16, 17 provided in the press inserts 7, whose diameters are adapted to the journal diameters. These engagement openings 18 are positioned in the press inserts 7 such that the end faces of their free ends 25, 26 are aligned with the end faces 27, 28 of the pressing jaw 6. According to the embodiment according to the invention, in this case press inserts 7 having nominal widths of more than 50, preferably more than 60, can be used.

Regardless of whether the press inserts 7 are designed to be floating or stationary, the engagement openings 18 are formed as blind holes.

In a floating storage of press inserts 7, the engagement openings 18 are formed such that a displacement of the Press inserts 7 can be done in the circumferential direction. Thus, these engagement openings 18 may, for example, be formed as slot blind bores. It is also conceivable, however, to choose the engagement openings 18 only larger in diameter than the pin diameters. According to the illustrated embodiment, a bore size is selected which allows a displacement in the circumferential direction by about one pin diameter.

In an unloaded basic position according to FIG. 8 the first, facing free ends 25 of the press inserts 7 protrude beyond the associated end faces 27 of the free end of the pressing jaw 6 opposite the joint formation 5, this offset dimension a being determined by the spring-loaded action of the second pin 17 in the region of the engagement opening 18 and simultaneously blocking support of the other engagement opening 18 on the first pin 16th

Since the press inserts 7 are each designed to be semicircular in order to obtain a complete pressing geometry, a return offset to the associated end faces 28 of the pressing jaw 6 results in the region of the second ends 26.

Furthermore, the pins 16 and 17 are positioned such that their pin axes include an acute angle alpha to the associated end faces 27, 28, which angle alpha is 30 ° in the illustrated embodiment.

In the course of a compression process, first the first ends 25 of the press inserts 7 come into abutment in the region of the gap left between the end faces 27 of the press jaw 6, while at the second diametrically opposite ends 26 associated with the joint formation 5 Movement gap 29 remains. Until this Verpresszwischenstellung the press inserts 7 remain in their normal position, ie in their non-fixed position to the associated pressing jaws 6. Only the further pressing operation effected via the system of the ends 25, a relative displacement of the press inserts 7 in the circumferential direction of the circumference, taking along the tension on the spring 23 loaded second pin 17th

In the injection position according to FIG. 10 Both the ends 25 and the ends 26 of the press inserts 7 are in contact with each other.

When opening the press die 2, the optionally clamped on the compact press inserts 7 are dragged over the pins 16, 17, wherein the holes 28 are selected in the press inserts 7 in size so that in each circumferential position of the press inserts 7 of the pin 16 or 17 is possible. There is always a support of Bohrungswandungsabschnitten to the associated pin 16 and 17th

Both the pressing properties and the release of the press inserts 7 from the compact can be further improved by a resilient tongue 30 of the press inserts 7. In the FIGS. 3 to 5 is a press insert 7 shown in individual representations. The press insert 7 has, on the inside, a section 40 of the first curvature and a section 42 of the second curvature, which protrudes beyond the section 40 of the first curvature by approximately 1-3 mm uninhibited, in any case inwardly, which section 41 of the second curvature protrudes from the section 40 first Curvature to form the tongue 30 is cut free.

The formed, end inwardly projecting tongue tip 42 is as out FIG. 4 can be seen, with respect to the circumferential extent of the entire press insert. 7 Arranged eccentrically, this with a central arrangement of the entire tongue 30, so that, based on a starting bisecting the press insert 7, a tongue root 43 is positioned symmetrically to the tongue tip 42. The measured in the circumferential direction length of the tongue 30 corresponds to about one third of the circumferential length of the press insert 7. at, viewed in transverse to the circumferential direction central arrangements of the tongue 30 has this in the same direction a width f, which is about two thirds to three quarters of the width g of Section 40 first curvature amounts.

In addition, to improve the compression properties inside the press insert 7 three mutually parallel, in the circumferential direction of the press insert 7 both over the portion 40 first bend and over the portion 41 second curve (tongue 30) extending ribs 44 are formed.

In the course of compression, which takes place, for example, with 20 tons, the spring clip 30 is displaced, for example. When reaching a pressing force of 500 kg in the deflected, the general circular section shape of the press insert 7 following position and thus does not interfere with the actual Verpressvorgang. After canceling the application of force, the spring-back of the tab 30 causes a lifting of the press insert 7 from the compact.

FIG. 14 shows an alternative embodiment of a pressing tool 1 according to the invention, in which the pressing jaws 6 are formed in mouth sections 45 of the forceps arms 12 extending beyond the tabs 13 also. In this way, a pliers-like pressing tool 1 is formed, the pressing jaws 6 are arranged and formed mirror-symmetrically. The latter carry on the inside, adapted to the compact press inserts 7. The latter are positively restrained by spaced in the direction of the circle spaced pin 16, 17 in the press jaws.

According to the first embodiment, these pins 16, 17 of each pressing jaw 6 are oriented in each case oriented in a radial direction and protrude radially inward into the press application area.

Contrary to the embodiment described above is in the embodiment according to FIG. 14 arranged to release the press insert 7 from the associated engagement opening 18 herausbewegbare first pin 16 laschenabgewandt in the mouth opening of the pressing jaw 6 formed between the press jaws. Consequently, the second, not herausbewegbare pin 17 is disposed facing the mouth opening.

The first pin 16 passes through in the longitudinal extent of an outwardly facing bore 46. the outwardly of this bore to the outside free end of the pin 16 is provided with a handle 47 for the return displacement of the pin 16 along its longitudinal axis. Via a compression spring 48, the pin 16 is biased in the engaged position.

According to the first embodiment, the second pin 17 is pivotally arranged. In the in FIG. 14 the embodiment shown, the pin 17 is biased by a spring-assisted, acting approximately transversely to the longitudinal axis of the pin 17 pressure pin 49 in its normal position. The spring bias causing compression spring is provided with the reference numeral 50.

The illustrated press inserts 7 correspond to those of the previously described embodiment.

Due to the changed to the first embodiment arrangement of pin 16 and pin 17 results in a basic position according to FIG. 14 in that here the second, lug-facing free ends 26 of the press inserts 7 protrude beyond the associated end faces 28 of the free ends of the pressing jaw 6 facing away from the tabs 13, an offset amount also being determined by the spring-loaded action of the second pin 17 in the region of the engagement opening 18 and simultaneous blocking support of the other engagement opening 18 on the first pin 16th

In the course of a compression process come in this embodiment initially the second ends 26 of the press inserts 7 to the plant, while at the first, laschengegewandten, diametrically opposite ends 25 still a movement gap remains. Up to this compression intermediate position, the press inserts remain in their normal position. Only the further pressing operation causes via the abutment of the ends 26 a relative displacement of the press inserts 7 in the circumferential direction of the circumference, taking along the pin 17 which is loaded via the spring-loaded pressure pin 49.

Claims (13)

1. Pressing tool (1) for pressing pipe ends, in particular ends of pipes laid for sanitary purposes, having pressing jaws (6) which are articulated to one another, each pressing jaw (6) having a pressing insert (7) and being configured in the shape of a circle-segment in the region of interaction between the pressing jaws (6) and the pressing insert (7), and it being possible to move the pressing insert (7) in the circumferential direction relative to the pressing jaw (6), the pressing inserts (7) furthermore initially coming into abutment at mutually facing first ends (25) during a pressing operation, while a movement gap (29) still remains at second ends (26), characterised in that the pressing tool (1) has two pressing jaws (6), which complement one another to form a closed pressing geometry, and in that the abutment locations of the pressing inserts (7) and the movement gap (29) are formed opposite one another.
2. Pressing tool according to claim 1, characterised in that the pressing inserts (7) are secured by latching in an operationally releasable manner.
3. Pressing tool according to either claim 1 or claim 2, characterised in that the movement gap (29) initially remains in the region of an articulated connection of the pressing jaws (6).
4. Pressing tool according to either claim 1 or claim 2, characterised in that the movement gap (29) initially remains in the region of the unconnected ends of the pressing jaws (6).
5. Pressing tool according to any one of claims 1 to 4, characterised in that tong legs (12) are provided, and in that the pressing jaws (6) are formed in mouth portions (45) of the tong legs (12) of the pressing tool (1).
6. Pressing tool according to any one of claims 1 to 5, characterised in that two pins (16, 17) are provided for securing the pressing inserts (7), are oriented radially inwards on a pressing jaw (6), project inwards on a radial line and past the pressing jaw (6), are spaced apart from one another in the direction of the circle, and engage in associated holes (18) of the pressing inserts (7), it being possible for at least one of said pins to be moved out of the pressing insert (7) in order for said insert to be removed.
7. Pressing tool according to claim 6, characterised in that the first pin (16), which can be moved out of the pressing insert (7), is disposed in the mouth opening remote from the link plates.
8. Pressing tool according to either claim 6 or claim 7, characterised in that a second pin (17), which cannot be moved out, is disposed facing the link plates.
9. Pressing tool according to any one of claims 6 to 8, characterised in that the second pin (17) is secured for rotary articulation in the pressing jaw (6), the longitudinal axis of the pin (17) passing through the rotary articulation.
10. Pressing tool according to any one of claims 6 to 9, characterised in that the second pin (17) passes through a circumferentially extending slot (24) of the pressing jaw (6).
11. Pressing tool according to claim 10, characterised in that the second pin (17) is spring biased against one end of the slot (24).
12. Pressing tool according to any one of claims 6 to 11, characterised in that the first pin (16) is formed on a rocker (19).
13. Pressing tool according to claim 12, characterised in that the end of the rocker (19) remote from the first pin (16) is supported in the pressing jaw by a spring.

Images