EP4311627A2 - Pressing jaws, and crimping pliers having two pincers - Google Patents

Abstract

The invention relates to pressing pliers with two jaws (2, 3), which are provided with pressing jaws (6, 7) arranged opposite one another, the pressing jaws (6, 7) being directed together in the direction in which the pressing jaws (6, 7) move together Axis of rotation (z) can be rotated, the pressing jaws (6, 7) being rotatable about the axis of rotation (z) even in the collapsed state without hindrance by a pliers jaw (2, 3) and a pressing jaw (6, 7) having a pivot pin (43 ) having. For the advantageous mobility of the pressing jaws, the invention proposes that the pivot pin (43) is mounted in one of the pliers jaws (2, 3) for pivoting, and that the pressing jaw (6) can be rotated about the pivot pin (43) in a mounted position Press jaws (6, 7) can be done.

Description

field of technology

The invention relates to pressing pliers with two pliers jaws, which are provided with oppositely arranged pressing jaws, the pressing jaws being rotatable together about an axis of rotation directed in the direction of retraction of the pressing jaws, and furthermore the pressing jaws around the axis of rotation even in the collapsed state without hindrance by a pliers jaw are rotatable and a pressing jaw has a pivot.

State of the art

Pressing tongs of the type in question are known. They are used, for example, to crimp conductor ends, for example using a wire end sleeve. The pressing jaws used for this are molded parts designed to move into one another, possibly having ribs. Known pressing pliers have jaws to which pressing jaws are attached. The pliers jaws can be opened or closed like pliers or scissors.

At one of the DE 198 18 482 C1 ( US 6151950 A ) known pressing pliers, the pressing jaws accommodated in the pliers jaws can only be moved together with the pliers jaws.

At one of the EP 0 516 598 A1 known pressing pliers, the pressing jaws are rotatable relative to the pliers jaws. The pressing jaws have a pivot which is accommodated in a plastic insert, which is held relative to the pliers jaws by means of axle stubs accommodated in the pliers jaws are pivotable. The pivot pins are connected to the pressing jaws in a rotationally fixed manner.

Summary of the invention

Based on the last-mentioned prior art, the invention is concerned with the task of specifying a pressing tongs of the type mentioned, in which the pressing jaws are advantageously designed to be movable.

This object is achieved in the subject matter of claim 1, with the aim being that the pivot pin is mounted in one of the pliers jaws for pivoting, and that the pressing jaw can be rotated about the pivot pin in a mounted position of the pressing jaws.

The proposed rotation around the axis of rotation can be infinitely variable, but alternatively also in steps, for example viewed in the circumferential direction in 15°, 30° or 45° steps.

The pivot pin can be held in the press jaw so that it can be removed. The pressing jaw can be rotatable about a geometric axis of rotation passing through the pivot. Accordingly, the pivot can offer the geometric axis of rotation.

The pivot pin can be accommodated in the associated pliers jaw in a pivot joint for pivoting about a pivot axis running transversely to the axis of rotation, with the pressing jaws being detached from the opposite pliers jaw, the pressing jaws being able to be rotated individually or together to be pulled out of the pliers mouth in the direction of the axis of rotation. By releasing one pressing jaw from the associated pliers jaw or From the associated pivot pin, a spacing of the top side of the pliers jaw facing the pressing jaw from the pressing jaw can be achieved by displacing the relevant pressing jaw in the direction of the other pressing jaw. There is a free space between the released pressing jaw and the facing top of the pliers jaw, which can be used to form one of the pair of pressing jaws around the pivot axis, in particular in a direction in which the pair of pressing jaws is moved out of the area of a pliers mouth. Afterwards, after releasing the further pressing jaw from the relevant pivot pin, the pair of pressing jaws can be pulled out essentially in the direction along the axis of rotation. This makes it possible to change the pressing jaws in a manner that is convenient in terms of handling.

Even in a collapsed state, the pressing jaws do not have any protrusion that would collide with the upper and/or lower jaw during rotation. To the extent that guide projections are provided, this is also achieved in that the leadership tasks that are to be performed by the guide projections are distributed on the assigned guide surfaces of the opposite press jaw, i.e. on both press jaws. In the given case, the guide projections are also designed in such a way that they only move into one another to such an extent that there is no collision with the pliers jaws when the pressing jaw rotates about the axis of rotation mentioned.

For example, to change the pressing jaw, for example after wear of the pressing jaw or to arrange a differently designed pressing jaw adapted to the compact, the pressing jaw can be dismantled from the pivot. This can be done without tools, moreover but if necessary also using a common tool, such as pliers or a screwdriver.

The holder of the pivot pin can be formed by a plug-in part which is received in a form-fitting manner both on the pivot pin and on the pressing jaw. To dismantle the pressing jaw from the pivot pin, the plug-in part must be removed, after which the positive connection is removed.

The plug-in part can be approximately U-shaped overall, correspondingly having two, preferably substantially parallel, mutually extending U-legs which are connected to one another via a U-web. The positive connection can be achieved in the area of the U-legs and/or the U-web.

The plug-in part can also be designed to be resilient, for example by designing the plug-in part as a wire-form spring, in particular a U-shaped wire-form spring.

In addition, the formation of a rotation axis and/or a pivot axis, as described above, is also conceivable for press jaws that have no guide elements or differently designed guide elements.

The pressing jaws can have ribs running in a longitudinal direction of the ribs, which move into one another during pressing.

Outside a working area of the ribs, a guide surface running transversely to the longitudinal direction of the ribs can be formed, which interacts with a guide projection extending from the opposite pressing jaw. As a result of this design, the press jaws are guided particularly in the course of a pressing process and the associated movement of the pressing jaws into one another. Any forces acting in the longitudinal direction of the rib on one and/or the other press jaw during the course of a compression, which could cause a displacement of one press jaw relative to the other press jaw in the longitudinal direction of the rib, are due to the interaction of the guide surface of one press jaw and the guide projection of the other press jaw recorded. This leads to proper pressing or crimping. The guide surface can be provided on a guide projection of the other pressing jaw. But it can also be given in a different form of the others. For example, the guide surface can also be provided on an assigned (end) region of one or more ribs of the other pressing jaw.

For this purpose, in a preferred embodiment, the guide projection of one press jaw projects beyond a parting plane of the press jaws that is directed transversely to the direction of travel of the press jaws, for preferred contact with the guide surface of the other press jaw.

The guide surface can, as basically mentioned, be formed, for example, by a rib end face that limits the longitudinal extent of the ribs (of the other pressing jaw).

The ribs have a longitudinal rib direction, with the ribs each having a free end face assigned to the other pressing jaw.

Seen in a cross section transverse to the longitudinal direction of the rib, the end face can have a rounded contour line that protrudes furthest in the middle.

As a result of the proposed cross-sectional design, preferably of each rib in the front area, there is improved pressing or crimping, for example of wire end sleeves. All ribs of one or both press jaws can have the rounded contour line.

The most protruding region of the end face pointing in the direction of the opposite pressing jaw or its groove base between two ribs leaving a groove between them is preferably essentially rounded, possibly having a constant radius over the length of the rounded contour line, and beyond this if necessary .but also having different radii with regard to the rounded contour line. In any case, part of the end face contour is preferably provided with a radius that is smaller than the dimension of a rib thickness transverse to the longitudinal extent of the rib, for example corresponding to 0.5 to 0.3 times the thickness.

As a result of this configuration, pressing pliers are improved, particularly with regard to handling. The pair of pressing jaws can be rotated around the axis of rotation into a position that is favorable for pressing or crimping to be carried out. The pressing jaws are designed in such a way that such a rotation of the pair of pressing jaws is preferably possible in any collapsed position, correspondingly also in the fully collapsed position.

The above-described configuration for enabling one of the pair of press jaws even in the collapsed state results from a pair of press jaws with a guide surface running transversely to the longitudinal direction of the ribs outside a working area of the ribs, which has a the guide projection emanating from the opposite press jaw interacts.

In addition, at least one pressing jaw can have a rib-side end face, whereby, seen in a cross section transverse to the longitudinal direction of the rib, there is a rounded contour line that is most protruding in the middle.

With regard to the design of the press jaws, it can further be provided that the ridge lines of at least one set of ribs in the view mentioned have a bulge which protrudes into the press jaw opening.

This preferably results in a strictly continuous straight-line design of the ridge line, for example a convex bulge in the direction of the press jaw opening. This protrusion can, as is also preferred, be provided partially with respect to the longitudinal extent of the ridge line, correspondingly only over a partial area.

As a result of such a design, a cross-sectional design of the press jaw opening that deviates from a possibly strictly rectangular-geometric cross-sectional design can result.

Using pressing jaws with a protrusion formed with respect to the above-described ridge lines, the pressing jaws can first be brought into contact with the outer wall surface of the ferrule with the protrusions formed on the ribs and with the help of the protrusions, during further pressing, concave wall sections in the essentially rectangular wall of the deformed ferrule are formed.

As a result, there is a favorable deformation of the workpiece or the wire end sleeve. In particular, based on a cross section through the pressed wire end sleeve transverse to the longitudinal extent of the received conductor ends, an almost complete filling of the cross section with conductor ends can be achieved. According to the proposed pressing process, there are preferably no cavities that can allow the conductor ends to be displaced even after pressing and thus possibly lead to the conductor ends becoming loose. The free inner cross section of the deformed wire end sleeve is preferably completely, almost homogeneously filled with conductor ends. This also makes it possible to achieve a more uniform arrangement of the conductor ends in the wire end sleeve.

In the course of the pressing process, the protrusions first reach the outer wall surface of the wire end sleeve, initially acting on it. Correspondingly, concave wall sections of the wall of the wire end sleeve result from the protrusions in the area of this loading.

The most centrally rounded contour line of the rib end face can be continuously curved, possibly with the exception of a flattening that also forms the most protruding area. With respect to the contour line, the flattening preferably appears as a straight line that merges into the continuously curved contour line. The straight line preferably merges into a continuously curved course on both sides.

The curvature can also extend until it enters a flank contour of the rib that extends in a straight line in the direction of convergence. For this purpose, with reference to the above-described cross section, the rib can have two possible, and also preferred, configurations. have parallel contour lines and the above-described curvature on the end face, and possibly a flattening that also forms the furthest protruding area. The curved (partial) contour line preferably merges into the surface contour.

The pressing jaws described here preferably consist of a metallic material, for example a steel material. They can be designed in several parts or in one piece. They can be formed, for example by hot forming, but also by primary molding, for example as a casting, in particular using the investment casting process. A sintering process can also be used.

A pliers jaw can also have an upper side facing the associated pressing jaw, with a guide projection in the retracted state of the pressing jaws with its surface in the retraction direction leaving a distance from the facing surface of the pliers jaw, this preferably also in the fully collapsed state of the pressing jaws. Regardless of the rotational position of the pair of pressing jaws about the axis of rotation, a collision-free displacement of a guide projection in the direction of the facing top of the jaw is possible. Preferably, even in the fully collapsed state, a guide projection does not extend beyond the opposite pressing jaw.

In the case of possible press jaws, the ribs of which have protrusions that project beyond the ridge line in the direction of the press jaw opening, these protrusions can lie in overlap with one another when viewed on a broad side of the ribs with respect to a group of ribs.

In a possible embodiment, only individual rib shares can have such protrusions, for example both rib shares of a press jaw, while the rib shares of the other press jaw have no such protrusions. Alternatively, a set of ribs on each press jaw can also be provided with such a bulge. In a further embodiment, all rib shares, corresponding to all ribs of both press jaws, are provided with such bulges.

According to a possible embodiment, the ridge lines can be continuous, i.e. H. extend straight from one end of the ridge line to the other end of the ridge line in the longitudinal direction. Such a ridge line can also have at least one straight area, which is followed by, for example, a bulge.

In addition, straight areas of the ridge line can also be provided on both sides of the bulge, based on the longitudinal direction of the ridge line, with different or even the same lengths.

These straight-running areas, which may be provided on both sides of the bulge, can merge into one another in a linear extension, so that these straight-running areas run in a possible, even preferred, configuration along a geometric base line stretched between the two end points of the ridge line.

A largest extent of the protrusion beyond such an imaginary baseline in the direction of the press jaw opening can correspond to a fiftieth to a tenth of the largest extent of the baseline that occurs when the press jaw opening is initially closed.

The initially closed press jaw opening is reached in the press jaw displacement position, in which the interlocking ribs of the press jaws moving towards one another with their ridge lines completely surround the press jaw opening in its largest cross-sectional configuration.

In a preferred embodiment, the bulges of the ribs act in every press jaw opening position, and accordingly act preferably when pressing a wide variety of ferrule cross sections.

The length of the protrusion measured in the direction of extension of the base line can also correspond to a third to a tenth of the largest extension of the base line that occurs when the press jaw opening is initially closed.

The ridge line can be formed in the area of the bulge in the shape of a circular section with a constant radius, possibly with a radius that changes in the direction of extension.

In a possible embodiment, there is also a highest point of the bulge, which highest point of the bulge is offset from a longitudinal center of the rib in relation to the greatest initial extension of the imaginary base line that occurs when the press jaw opening is initially closed. This offset can extend to a complete off-center arrangement of the entire protrusion, for example when pressing ferrules with a relatively large cross section, for example 16 mm ² . When pressing ferrules with a smaller cross-section, for example 6 mm ² or 2.5 mm ² , this can be referred to at the moment of pressing the then effective ridge line results in an arrangement of the bulge interspersed with the longitudinal center.

The offset is preferably in the direction of the base line of the next rib of the same press jaw arranged next to one another, which adjoins the base line essentially at right angles to the base line. The longitudinal center here refers to a center when the press jaw opening is initially closed between the points delimiting the end of the ridge line, corresponding to the imaginary base line.

With regard to the proposed method, this results in a concavity which is formed asymmetrically with respect to a center line aligned perpendicular to an otherwise linear ridge base line. The concave wall sections of the pressed ferrule result accordingly, particularly in the case of larger diameter cross sections, such as 16 mm ² or 8 mm ² , with respect to a wall leg of the otherwise essentially rectangular wall, viewed in cross section, tend to be assigned to the corner area, while assigned to the opposite one Corner area of the relevant wall section preferably runs in a straight line. With smaller cross sections, a wall leg can even be created with a concave wall section that is flanked on both sides by straight wall sections of at least approximately the same length. With the smallest cross-sections, for example 2.5 mm ² , the effect occurs that essentially only a concave wall section is created that connects the corner regions of the otherwise essentially rectangular wall. With these small cross-sections, it can happen that the pressing contour on both sides of the bulge is not completely filled during the pressing process and that no straight-line wall sections are formed.

With regard to the disclosure, the ranges or value ranges or multiple ranges specified above and below also include all intermediate values, in particular in one-tenth increments of the respective dimension, possibly also dimensionless. For example, the statement one-fiftieth to one-twentieth also includes the disclosure of ten five-hundredths to nine two-hundredths, eleven five-hundredths to ten two-hundredths, eleven five-hundredths to nine two-hundredths, etc. On the one hand, this disclosure can be used to limit a specified area limit from below and / or above, alternatively or serve in addition to reveal one or more singular values from a specified area.

In the case of possible press jaws, the ribs of which have protrusions that project beyond the ridge line in the direction of the press jaw opening, these protrusions can lie in overlap with one another when viewed on a broad side of the ribs with respect to a group of ribs.

In a possible embodiment, only individual rib shares can have such protrusions, for example both rib shares of a press jaw, while the rib shares of the other press jaw have no such protrusions. Alternatively, a set of ribs on each press jaw can also be provided with such a bulge. In a further embodiment, all rib shares, corresponding to all ribs of both press jaws, are provided with such bulges.

According to a possible embodiment, the ridge lines can run continuously, ie from one end of the ridge line to the other end of the straight line in the longitudinal direction. Such a ridge line can also have at least one straight area, which is followed by, for example, a bulge.

In addition, straight areas of the ridge line can also be provided on both sides of the bulge, based on the longitudinal direction of the ridge line, with different or even the same lengths.

These straight-running areas, which may be provided on both sides of the bulge, can merge into one another in a linear extension, so that these straight-running areas run in a possible, even preferred, configuration along a geometric base line stretched between the two end points of the ridge line.

A largest extent of the protrusion beyond such an imaginary baseline in the direction of the press jaw opening can correspond to a fiftieth to a tenth of the largest extent of the baseline that occurs when the press jaw opening is initially closed.

The initially closed press jaw opening is reached in the press jaw displacement position, in which the interlocking ribs of the press jaws moving towards one another with their ridge lines completely enclose the circumference of the press jaw opening in their largest cross-sectional design.

In a preferred embodiment, the bulges of the ribs act in every press jaw opening position, and accordingly act preferably when pressing a wide variety of ferrule cross sections.

The length of the protrusion measured in the direction of extension of the base line can also correspond to a third to a tenth of the largest extension of the base line that occurs when the press jaw opening is initially closed.

The ridge line can be formed in the area of the bulge in the shape of a circular section with a constant radius, possibly with a radius that changes in the direction of extension.

In a possible embodiment, there is also a highest point of the protrusion, which highest point of the protrusion is offset from a longitudinal center of the rib in relation to the largest extension of the imaginary base line that occurs when the press jaw opening is initially closed. This offset can extend to a complete off-center arrangement of the entire protrusion, for example when pressing ferrules with a relatively large cross section, for example 16 mm ² . When pressing ferrules with a smaller cross section, for example 6 mm ² or 2.5 mm ² , at the moment of pressing, an arrangement of the bulge penetrated by the longitudinal center can result in relation to the then effective ridge line.

The offset is preferably in the direction of the base line of the next rib of the same press jaw arranged next to one another, which adjoins the base line essentially at right angles to the base line. The longitudinal center here refers to a center when the press jaw opening is initially closed between the points delimiting the end of the ridge line, corresponding to the imaginary base line.

This results in a concavity that is formed asymmetrically with respect to a ridge base line that is aligned perpendicular to an otherwise linear ridge base line. The concave wall sections of the pressed wire end sleeve result accordingly, especially with larger diameter cross sections, such as 16 mm ² or 8 mm ² , with reference to a wall leg viewed in cross section of the otherwise im Substantially rectangular wall tends to be assigned to the corner area, while assigned to the opposite corner area, the wall section in this regard preferably runs in a straight line. With smaller cross sections, a wall leg can even be created with a concave wall section that is flanked on both sides by straight wall sections of at least approximately the same length. With the smallest cross sections, for example 2.5 mm ² , the effect can even arise that essentially only a concave wall section is created that connects the corner regions of the otherwise essentially rectangular wall. With these small cross-sections, it can happen that the pressing contour on both sides of the bulge is not completely filled during the pressing process and that no straight-line wall sections are created.

Brief description of the drawings

Fig. 1

in perspektivischer Darstellung eine Presszange in einer Pressmaul-Offenstellung;

Fig. 2

die Seitenansicht hierzu;

Fig. 3

die Presszange in Draufsicht;

Fig. 4

eine vergrößert dargestellte Stirnansicht gegen die Presszange;

Fig. 5

die Herausvergrößerung des Bereiches V in Fig. 1;

Fig. 6

eine Schnittdarstellung gemäß der Schnittebene VI in Fig. 5;

Fig. 7

die Herausvergrößerung des Bereiches VII in Fig. 6;

Fig. 8

in perspektivischer Detaildarstellung die Pressbackenanordnung, betreffend die Pressbacken-Offenstellung;

Fig. 9

eine weitere perspektivische Darstellung der Pressbackenanordnung, betrachtet in Pfeilrichtung IX in Fig. 8;

Fig. 10

eine der Fig. 9 entsprechende Darstellung, jedoch nach Abziehen von die Pressbacken an der Presszange festlegenden Steckteilen;

Fig. 11

die Pressbacken mit zugeordneten Schwenkzapfen und Steckteilen in einer perspektivischen Explosionsdarstellung;

Fig. 12

den Schnitt gemäß der Linie XII - XII in Fig. 4 durch die Pressbacken-Anordnung;

Fig. 13

eine der Fig. 12 entsprechende Darstellung, jedoch im Zuge einer gemeinsamen Verdrehung des Pressbacken-Paares;

Fig. 14

in einer Einzeldarstellung einen, zur Halterung einer ausgebildeten Schwenkzapfen;

Fig. 15

eine weitere Ansichtsdarstellung des Schwenkzapfens;

Fig. 16

den Schwenkzapfen in perspektivischer Darstellung;

Fig. 17

eine im Wesentlichen der Fig. 9 entsprechende Darstellung, jedoch nach Aufhebung der Halterung einer Pressbacke an dem zugehörigen Schwenkzapfen und Abschwenken des Pressbacken-Paares in eine Entnahmestellung;

Fig. 18

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

Fig. 19

eine Schnittdarstellung gemäß der Schnittebene XIX in Fig. 8 bei in dem Pressmaul eingelegtem Werkstück, betreffend eine Pressbacken-Offenstellung;

Fig. 20

die Ansicht gemäß Pfeil XX in Fig. 19;

Fig. 21

eine der Fig. 18 entsprechende Darstellung, betreffend eine Zwischenstellung im Zuge eines Verpressvorganges;

Fig. 22

eine der Fig. 19 entsprechende Darstellung, betreffend die Press-Zwischenstellung gemäß Fig. 21;

Fig. 23

die Ansicht gemäß Pfeil XXIII in Fig. 22;

Fig. 24

eine Folgedarstellung zu Fig. 22 im Zuge einer weiteren Pressbackenverlagerung;

Fig. 25

die Ansicht gemäß Pfeil XXV in Fig. 24 mit weiter einer lupenartigen Vergrößerungsdarstellung;

Fig. 26

eine Folgedarstellung zu Fig. 21, betreffend eine Zwischenstellung unter einer ersten Biegeauslenkung eines auf eine Pressbacke einwirkenden Halterungsteils;

Fig. 27

das Halterungsteil in einer Einzeldarstellung;

Fig. 28

eine Folgedarstellung zu Fig. 26 im Zuge des weiteren Verpressvorganges, bei weiterer federnder Ausbiegung des Halterungsteils;

Fig. 29

eine Seitenansicht gemäß Fig. 4, betreffend eine zweite Ausführungsform der Pressbacken;

Fig. 30

das Pressbacken-Paar der Ausführungsform gemäß Fig. 29 in perspektivischer Darstellung;

Fig. 31

in schematischer und vergrößerter Darstellung die durch die Rippen der Pressbacken der zweiten Ausführungsform begrenzte Pressbackenöffnung;

Fig. 31a

die Herausvergrößerung des Bereiches XXXIa in Fig. 31;

Fig. 32

eine der Fig. 29 entsprechende Darstellung bei in der Pressbackenöffnung zur Verpressung einliegendem Werkstück;

Fig. 33

eine Folgestellung zu Fig. 32 im Zuge eines Verpressvorgangs;

Fig. 34

eine Folgedarstellung zu Fig. 33, die Verpress-Endstellung betreffend;

Fig. 35

in Einzeldarstellung ein mit einem Pressbacken-Paar der zweiten Ausführungsform gemäß Fig. 29 verpresstes Werkstück in Form einer, Leiterenden aufnehmenden Aderendhülse.

The invention is explained below with reference to the accompanying drawing, which only represents exemplary embodiments. A part that is only explained in relation to one of the exemplary embodiments and is not replaced by another part in a further exemplary embodiment due to the special feature highlighted there is therefore also described as a possible existing part for this further exemplary embodiment. On the drawing shows:

Fig. 1

in a perspective view a pressing tongs in a pressing jaw open position;

Fig. 2

the side view of this;

Fig. 3

the pressing tongs in top view;

Fig. 4

an enlarged front view against the pressing tongs;

Fig. 5

the enlargement of the area V in Fig. 1 ;

Fig. 6

a sectional view according to the section plane VI in Fig. 5 ;

Fig. 7

the enlargement of area VII in Fig. 6 ;

Fig. 8

in a perspective detailed view of the press jaw arrangement, regarding the press jaw open position;

Fig. 9

Another perspective view of the press jaw arrangement, viewed in the direction of arrow IX in Fig. 8 ;

Fig. 10

one of the Fig. 9 Corresponding illustration, but after removal of the plug-in parts securing the pressing jaws to the pressing tongs;

Fig. 11

the pressing jaws with associated pivot pins and plug-in parts in a perspective exploded view;

Fig. 12

the cut according to the line XII - XII in Fig. 4 through the press jaw arrangement;

Fig. 13

one of the Fig. 12 corresponding representation, but in the course of a joint rotation of the pair of pressing jaws;

Fig. 14

in an individual representation one, designed to hold a pivot pin;

Fig. 15

another view of the pivot pin;

Fig. 16

the pivot pin in perspective view;

Fig. 17

one essentially the Fig. 9 Corresponding illustration, but after lifting the holder of a pressing jaw on the associated pivot pin and pivoting the pair of pressing jaws into a removal position;

Fig. 18

the cut according to the line XVIII - XVIII in Fig. 3 ;

Fig. 19

a sectional view according to the section plane XIX in Fig. 8 with a workpiece inserted in the press jaw, regarding a press jaw open position;

Fig. 20

the view according to arrow XX in Fig. 19 ;

Fig. 21

one of the Fig. 18 corresponding representation, relating to an intermediate position in the course of a pressing process;

Fig. 22

one of the Fig. 19 corresponding illustration regarding the intermediate press position Fig. 21 ;

Fig. 23

the view according to arrow XXIII in Fig. 22 ;

Fig. 24

a follow-up presentation Fig. 22 in the course of a further relocation of the press jaws;

Fig. 25

the view according to arrow XXV in Fig. 24 with a magnifying glass-like enlargement display;

Fig. 26

a follow-up presentation Fig. 21 , relating to an intermediate position under a first bending deflection of a holding part acting on a press jaw;

Fig. 27

the holding part in an individual representation;

Fig. 28

a follow-up presentation Fig. 26 in the course of the further pressing process, with further resilient deflection of the holding part;

Fig. 29

a side view according to Fig. 4 , relating to a second embodiment of the pressing jaws;

Fig. 30

the pair of pressing jaws according to the embodiment Fig. 29 in perspective view;

Fig. 31

a schematic and enlarged representation of the press jaw opening delimited by the ribs of the press jaws of the second embodiment;

Fig. 31a

the enlargement of the area XXXIa in Fig. 31 ;

Fig. 32

one of the Fig. 29 Corresponding representation with the workpiece placed in the press jaw opening for pressing;

Fig. 33

a follow-up position Fig. 32 in the course of a pressing process;

Fig. 34

a follow-up presentation Fig. 33 , concerning the final grouting position;

Fig. 35

in an individual representation with a pair of pressing jaws according to the second embodiment Fig. 29 Pressed workpiece in the form of a wire end sleeve that accommodates conductor ends.

Description of the embodiments

It is shown and described, initially with reference to Fig. 1 , a pressing pliers 1, which essentially has two pliers jaws 2, 3, two handle parts 4, 5, as well as a first pressing jaw 6 and a second pressing jaw 7, which are arranged opposite one another as a pair of pressing jaws.

The Figures 1 to 28 show a pressing tongs 1 with pressing jaws 6 and 7 in a first embodiment. A second embodiment of the pressing jaws 6 and 7 is in the Figures 29 to 35 shown.

The pliers jaw 2 and the associated handle part 4 are further referred to below as fixed, while the pliers jaw 3 and the handle part 5 associated with it are further referred to as movable.

The first pressing jaw 6 is assigned to the fixed jaw 2, while the movable jaw 3 carries the second pressing jaw 7.

The fixed pliers jaw 2 is essentially composed of two jaw parts 8 of essentially the same design, spaced apart from one another transversely to the longitudinal extent of the pliers jaw 2, the ends of which, in the areas facing away from the pressing jaws 6 and 7, merge into the rigid with the so Designed pliers jaw 2 connected handle part 4. The latter, like the movable handle part 5, can be enclosed by a handle cover 9 or 10.

The movable pliers jaw 3 is rotatably mounted on the fixed pliers jaw 2 about a geometric rotation axis on a pin 12 extending between the jaw parts 8 of the fixed pliers jaw 2 in the direction of extension of the axis of rotation x.

The axis of rotation x runs essentially transversely to the longitudinal extension direction, in particular of the fixed pliers jaw 2 and the grip part 4 adjoining it.

Furthermore, the movable pliers jaw 3 is spring-loaded in the direction of its stop-limited rotary open position. For this purpose, in the exemplary embodiment shown, a spring 13 is provided, preferably as shown in the form of a cylindrical tension spring, which engages a lever end of the movable pliers jaw 3 facing away from the assigned second pressing jaw 7. The end of the spring 13 facing away from the pliers jaw 3 is connected to another pin 14 of the fixed pliers jaw 2.

Essentially starting from the geometric axis of rotation the pressing tongs 2 directed lever section, at the end region of which the assigned second pressing jaw 7 is held.

Overall, the movable pliers jaw 3 in the illustrated embodiment is preferably formed by a plate-like lever part 15 of uniform material throughout.

In addition, the movable handle part 5 is articulated essentially at the end of the lever section 17 acted upon by the spring 13. The relevant geometric axis of rotation y extends in parallel alignment to the geometric axis of rotation x of the movable pliers jaw 3. In conjunction with a ratchet arm 18, this results in a knee joint arrangement K relating to the articulation of the handle part 5 and the action via the handle part 5 on the pliers jaw 3.

For this purpose, the ratchet arm 18 is articulated at one end to the fixed jaw 2 and at the other end to the movable handle part 5. The relevant geometric axes of rotation also run parallel to the geometric axis of rotation x, as well as to the geometric axis of rotation y.

A toothed ratchet section 19 is formed on the ratchet arm 18, for interaction when the pressing tongs 1 are actuated with a pawl 20 which is pivotally articulated on the movable handle part 5. The latter is spring-loaded into a basic position due to the arrangement of a tension spring 21 in the movable handle part 5.

In a known manner, an adjustment of the knee joint arrangement K is made possible by an adjusting part 22 which is accessible from the outside on the fixed pliers jaw 2 and is rotatable about the geometric axis of rotation, about which the ratchet arm 18 can also be moved in the area of the fixed pliers jaw 2, which is provided in several Rotary positions can be locked. The actuating part 22 acts on the axis of rotation of the fixed jaw via an eccentric, not shown Ratchet arm 18, so that a corresponding linear displacement of the relevant geometric axis of rotation can be achieved.

The first pressing jaw 6 is attached to the end of a resilient holding part 23. With regard to a center line a of the holding part 23 which runs essentially in the longitudinal extent of the fixed pliers jaw 2 and its extension into the fixed handle part 4, there is a substantially concave course when viewed from the movable pliers jaw 3 or the movable handle part 5, in particular in the area of a holding part -Section 24 between the free end holding the first pressing jaw 6 and a stop connection 25, described in more detail below.

The holding part 23 is preferably flanked on both sides by the jaw parts 8 of the fixed pliers jaw 2, the holding part section 26 facing away from the end carrying the first pressing jaw 6 being connected at the end to the fixed pliers jaw 2, correspondingly with the jaw parts 8, and/or the fixed handle part 4 connected is. In the exemplary embodiment shown, a fixed connection 27 is provided in this regard by two pin connections spaced apart from one another in the direction of extension of the center line a.

The pressing jaws 6, 7 are designed to be arranged opposite one another in the pressing tongs 1. One or both pressing jaws 6, 7 have ribs 29. The ribs 29, 31 have a rib longitudinal direction R corresponding to a course of their free ends, projected onto a base surface, cf., for example. Fig. 11 . When pressed, the ribs 29, 31 can, as a rule, extend over part of their height H, cf. also Fig. 11 , run into each other. This will also be the case Figures 6, 7 referred. The area of the ribs 29, 31, which usually comes into engagement with a compact during compression, is referred to as the working area. The ribs point outside the working area of the ribs 29, 31 29, 31 has a guide surface F, which interacts with a guide projection 38 extending from the pressing jaw 6, 7. This results in an interaction and thus also an prevention or limitation of displacement in the longitudinal direction of the rib. Additionally or alternatively, the guide surface can also be provided in the transverse direction. In the exemplary embodiment shown, this is given by a corresponding end face S pointing in this direction, possibly opposite on both sides, of a guide projection 38, cf Fig. 5 . The guide surface that may be provided in the transverse direction serves less to limit displacement and more, if necessary, to provide additional guidance in the sense of linear guidance of the pressing jaws relative to one another. A displacement limitation in this regard is preferably already achieved by the interlocking ribs.

The pressing jaws 6 and 7 are preferably designed in the same way, more preferably initially having a base body 28 on which the ribs 29 are arranged, initially with reference to the pressing jaw 6. The ribs 29 and the base body 28 are, as preferred, formed in one piece using the same material.

The ribs 29 of the pressing jaw 6 have the longitudinal direction R of the ribs. With reference to a viewing direction perpendicular to this rib longitudinal direction R, the floor plan results in essentially triangular ribs 29, with an outer rib end face 30 running essentially perpendicular to the base body 28 or perpendicular to the rib longitudinal direction R. Starting from this rib end face 30, the rib end face falls in the rib longitudinal direction R extending end face facing the opposite pressing jaw in the direction of the base body 28.

Rectified ribs of a pressing jaw 6 or 7 are arranged at a distance from one another transversely to the longitudinal direction R of the ribs, in particular at a distance which essentially corresponds to the rib thickness viewed in the distance direction.

Additional ribs of the same press jaw 6 and 7 partially dip into these distance areas of a press jaw 6 and 7, respectively. With reference to an end view of the pressing jaw 6, in which end view the triangular plan shape of a rib 29 is shown, the further ribs 29 which engage in the spaces between the above-described ribs 29 are arranged essentially in mirror image, but preferably offset by one rib width, accordingly also having an outer rib end face 30 which runs essentially vertically to the base body 28 and which lies opposite the rib end faces 30 of the ribs 29 described above. These further ribs 29 also fall in the longitudinal direction of the ribs towards the base body 28. Rectified ribs 29 of the pressing jaw 6 form a group of ribs 54 or 55 (cf. Fig. 8 ).

The opposite pressing jaw 7 has the same design and arrangement of the ribs, correspondingly having triangular ribs 31 with outer rib end faces 32 with respect to a floor plan viewed from the end face.

The ribs 29 and 31 of the pressing jaws 6 and 7 interlock like a comb, with the above-described triangular plan design of the ribs 29 and 31, as well as the mirror-image arrangement within a pressing jaw 6 and 7, independent of the spacing of the pressing jaws 6 and 7 from one another. such as in Fig. 1 can be seen, press jaw opening 33 with a preferably square, more preferably square floor plan sets. The edge length of the press jaw opening 33 can be changed evenly in the course of a changing linear spacing of the press jaws 6 and 7 from one another.

Facing the other pressing jaw, each rib 29, 31 has a free end face 34, with a cross-section as shown in Fig. 7 This rounded or curved contour line 35 extends between the flank contour 36 of the rib 29, 31, which preferably extends in a straight line with respect to a retraction direction r of the pressing jaws 6 and 7, where further with regard to a rib 29, 31, a parallel flank contour 36 is preferably provided on both sides. Viewed in the direction of the opposite pressing jaw, this preferably results in an overall concavely curved contour line 35.

The curved contour line 35 can extend continuously over the entire rib thickness viewed transversely to the longitudinal direction of the rib, for example having a (constant) radius of curvature that can correspond to half the rib thickness dimension.

As further shown, the constant curvature of the contour line 35 can, if necessary, be interrupted by a flattening 37 which forms the most protruding region of the rib 29, 31 and is approximately central with respect to the cross section. This can be transversely oriented and possibly rectilinear with respect to the cross section run to the flank contour 36.

Based on a view perpendicular to the direction of retraction r pressing jaws 6 and 7, there is a ridge line 56 along the end face 34 when viewed on the rib end face 30 and 32. This ridge line 56 is in the in the Figures 1 to 28 The first exemplary embodiment shown is preferably stretched in a straight line throughout (cf. Fig. 4 ).

Transverse to the longitudinal direction of the ribs, when the pressing tongs 1 is actuated, in particular in the course of a pressing operation to be carried out, the ribs 29 and 31 can be supported and thus the pressing jaws 6 and 7 can be guided accordingly.

A guide is also provided, particularly in the longitudinal direction of the ribs. For this purpose, each pressing jaw 6, 7, connected to the respective base body, has at least one guide projection 38, with a length viewed in the retraction direction r, which can essentially correspond to the length viewed in the same direction on the same base body 28. Ribs 29 and 31 can correspond. The guide projection 38 extends transversely to the longitudinal direction of the ribs over a distance which, in the exemplary embodiment shown, covers the arrangement of two or three ribs 29, 31.

The guide projection 38 further extends along the associated rib end face 30 or 32.

In the use position of the pressing jaws 6 and 7, in which the ribs 29 and 31 engage one another, the guide projection 38 interacts with the rib end faces 30 and 32, respectively, which form a guide surface.

Such support via a guide projection 38 is provided oppositely when viewed in the longitudinal direction of the rib, with the opposite guide projections 38 being double on one side, exposing a central retraction opening 39 remaining between them and on the opposite side is preferably only simple, for insertion into the central entry opening of the other pressing jaw 6, 7.

This also provides additional guidance due to the contact of the mutually facing longitudinal edge surfaces of the comb-like cooperating guide projections 38 of both pressing jaws.

In order to further improve the pressing tongs 1, in particular in terms of handling, the pressing jaws 6 and 7 can be rotated together in the use position between the fixed tong jaw 2 and the movable tong jaw 3 about an axis of rotation z, which is in the retraction direction r and transversely to the geometric axes of rotation x and y the movable pliers jaw 3 or the movable handle part 5 is directed.

This possible rotation is independent of the collapsing position of the pressing jaws 6 and 7, ie both in the basic position of the pressing jaws, for example as shown in Fig. 2 , as well as in a pressing tongs end position, for example as shown in Fig. 28 , as well as in every intermediate position between the basic position and the final position.

This rotatability about the axis of rotation z, even in a collapsed position in which the pressing jaws 6 and 7 are complete, which is theoretically only possible if there is no workpiece to be pressed in the pressing jaw opening 33, is essentially achieved by the surface facing the opposite jaw of the pliers 40 of a guide projection of the pressing jaw arranged on the opposite pliers jaw does not move beyond a lower surface 41 of the base body 28 of the opposite pressing jaw in this retracted position. Accordingly, there is always a distance between the surface 40 of the guide projection 38 and the facing surface 42 of the pliers jaw, towards which the guide projection 38 moves.

In order to achieve rotatability, a pivot pin 43 is initially assigned to each pressing jaw 6 or 7. This sits, passing through the lower surface 41, in a shape-adapted recess 44 of the base body 28 of the pressing jaw 6, 7. The pressing jaw 6, 7 is rotatable relative to the pivot 43 about the axis of rotation z, while the pivot pin 43 is preferably not displaceable with respect to the axis of rotation z in the respectively assigned end of the jaw 2, 3 or the lever part 15 or holding part 23 is received.

The pressing jaw 6 or 7 can be mounted on the respective pivot pin 43 so that it can be removed. For this purpose, in the exemplary embodiment shown, a U-shaped plug-in part 45 is provided, which can optionally be inserted or removed from the end face which also forms the press jaw opening 33 transversely to the axis of rotation z. For this purpose, two channels 46 are provided in the base body 28 of the pressing jaw 6, 7, running parallel and transverse to the axis of rotation z, through which the U-legs of the plug-in part 45, which preferably run parallel to one another in the unloaded state, can be inserted. The channels 46 cross the recess 44 which essentially accommodates the pivot 43 (cf. Fig.11 ).

The pivot pin 43 can be provided with a polygonal cross-section at least in the section that interacts with the plug-in part 45, in the illustrated embodiment in the form of an octagon. The U-legs of the plug-in part 45 lie on two flat sides of the polygonal pivot pin 43, which are opposite with respect to the axis of rotation z at. There is thus a positive reception of the plug-in part 45 both in the pressing jaw 6, 7 and on the pivot pin 43, since the polygonal formation described above is formed in particular in a diameter-constricted area of the pivot pin 43, accordingly the U-legs in the circumferential shape formed thereby Insert the ring groove (see also Fig. 6 ). This means that there can be a rotation-locking fixation in several rotational positions.

By pulling out the plug-in part 45, which in a further embodiment is preferably designed to be resilient, the pressing jaw 6, 7 can be released from the pivot 43 in order to remove the pressing jaw 6, 7.

Each pivot pin 43 can also be attached to the associated pliers jaw 2, 3 or to the associated lever part 15 or holder part 23 via a pivot joint 47. The geometric pivot axis u is directed transversely to the axis of rotation z, possibly, as is also preferred, aligned parallel to the geometric axes of rotation x and y of the movable jaw 3 and / or the movable handle part 5.

For this purpose, a pivot pin 48 is formed on the pivot pin 43 in an extension of the section accommodated in the base body 28 of the pressing jaw 6, 7, which can be covered on both ends by guide jaws 49 which are enlarged compared to the pin diameter.

The respective pivot pin 48 is accommodated in a shape-adapted cavity 50 of the associated pliers jaw 2, 3 or the associated lever part 15 or holder part 23, which cavity 50 is preferably in cross section as shown in Fig. 15 over half the circumferential extent of the pivot pin 48 extends to provide a captive holder for the pivot pin 43.

In conjunction with the above-described pivotability about the pivot axis u given here and the ability to dismantle the press jaws 6, 7 from the respective pivot pin 43, the press jaws 6, 7 can be easily removed and equipped with them. For example, for removal, the plug-in part 45 of the first pressing jaw 6 assigned to the fixed pliers jaw 2 can first be removed, after which the first pressing jaw 6 can be displaced in the direction of the retraction direction r with the meshing interaction of the ribs 29 and 31 onto the opposite second pressing jaw 7 . The pivot pin 43 leaves the recess 44, after which the pair of pressing jaws can be pivoted forward about the pivot axis u of the second pressing jaw 7 assigned to the movable jaw 3, for example by a pivot angle of approximately 15° to 30°. In this position, but also possible beforehand, the further plug-in part 45 of the second pressing jaw 7 can then be removed, after which the pair of pressing jaws as a whole can be removed from the pivot 43 of the second pressing jaw 7. A pair of press jaws is assembled in the reverse order.

The second pressing jaw 7 can also first be released from the associated pivot pin 43 and then moved in the direction of the first pressing jaw 6, after which the pair of pressing jaws is pivoted forward about the pivot axis u of the first pressing jaw 6, the first pressing jaw 7 from the pivot pin 43 loosened and finally the pair of press jaws released in this way is removed.

In the case of one of the pliers jaws, the fixed pliers jaw 2, the associated pressing jaw 6 is connected to the fixed pliers jaw 2 by means of the holding part 23 already mentioned. The holding part 23 is basically resilient in the sense that it can deflect resiliently against the pressing direction. In the connection area of the fixed connection, there is no or at least practically no relative movement between the holding part 23 and the fixed jaw 2 when pressing with the pressing tongs.

The holding part 23 can also move relative to the fixed jaw 2 during compression. The movement results at least essentially through an elastic deformation with regard to the forces acting on the pressing jaw 6 during compression, which are absorbed by the holding part 23. However, this mobility is limited due to a stop which is formed on the holding part 23 and/or the fixed pliers jaw 2 and, with appropriate force or deformation of the holding part 23, leads to a stop connection between the holding part 23 and the fixed pliers jaw 2. When this stop connection is reached, there is, as it were, a shortening of the resilient area of the holding part 23. When a further force is applied, the holding part 23 no longer deflects elastically by a corresponding amount by which it previously deflected with a corresponding amount of force. Nevertheless, there is still further flexibility.

The stop connection 25 provided in the area of the holding part 23 assigned to the fixed pliers jaw 2 is provided by a stop, which is specifically and preferably formed by a stop section 51. The stop can rest against an edge of the holding part 23 come. It is preferred and shown in the exemplary embodiment that the holding part 23 has an elongated hole 53 in which the stop, here preferably in the form of the pin 52, is received. In the given case, if this is provided, the elongated hole 53 extends with its central axis directed in the longitudinal direction essentially approximately perpendicular to the above-described center line a of the holding part 23.

The elongated hole 53 has a width adapted to the diameter of the pin 52, while the length viewed perpendicular thereto can correspond to approximately 1.5 to approximately 2 times the pin diameter.

The holding part 23 is suitable for bending deformation in the course of applying compression force, in particular for bending deformation essentially counter to the retraction direction r and transverse to the center line a. In the course of this bending deformation, which initially and essentially results from the clamping in the area of the fixed connection 27 to the fixed pliers jaw 2, the elongated hole 53 in the holding part 23 can come into contact with the stop section 51 or the pin 52. The holding part 23 only receives support in this contact position in the area of the stop connection 25, which, in the course of a further introduction of pressing force, for example when pressing larger-diameter workpieces W, causes a predominant bending stress on the holding part 23, possibly only in the holding part section 24 .

The workpiece W to be pressed can, as is also preferred and shown, be a wire end sleeve 57 which includes conductor ends 58 of a cable. The compression results in a pull-tight connection between the wire end sleeve 57 and the conductor ends 58 due to the deformation of the wall 59 of the wire end sleeve 57.

The holding part 23 is preferably designed as a flat part, with a smaller thickness d compared to its length l. In the exemplary embodiment shown, the length l corresponds to approximately 15 to 30 times, and further approximately 20 times the thickness d. The holding part also preferably rests practically directly on a corresponding flat side of the fixed pliers jaw 2.

In addition, particularly in the respective central area, at least in the middle third of the length, of the holding part section 24 and the holding part section 26, there is a smallest cross section b, b ', viewed transversely to the center line a. The smallest cross section (dimension b') between the fixed connection 27 and the stop connection 25 is preferably larger than the smallest cross section (dimension b) between the stop connection 25 and the holding area for the first pressing jaw 6. The dimension of the smallest cross section 6 between the Stop connection 25 and press jaw holder can correspond to 0.3 to 0.8 times the dimension of the smallest cross section b 'between the stop connection 25 and the fixed connection 27.

In the exemplary embodiment shown, viewed in the extension direction of the center line a, starting from the holding area for the first pressing jaw 6 in the direction of the stop connection 25, a smaller cross-sectional dimension b is given throughout over half to 2/3 of the relevant length of the holding part section 24 in comparison to the cross-sectional dimension b 'over the entire length of the holding part section 26 extending between the stop connection 25 and the fixed connection 27. Accordingly, there can be an area of the largest in the holding part section 24 between the stop connection 25 and the holding area for the first pressing jaw 6 deformation result.

This enables a favorable force-path compensation in order to be able to press workpieces W with different diameters without changing the pressing jaws 6 and 7. The respective lever path, in particular of the handle part 5, is the same regardless of the workpiece diameter up to a position in which the pawl 20 leaves the ratchet section 19. The movable handle part 5 that is then released can be swiveled back, opening or distancing the pressing jaws 6 and 7 from one another.

In addition, the force-path compensation is supported due to a possible bending deformation in the area of the lever part 15 assigned to the movable jaw 3 or directly forming this jaw 3, in particular in the area between the axis of rotation x and the pivot joint 47 of the assigned second pressing jaw 7 resulting lever section 16, which, viewed transversely to its essential longitudinal extent, has a smaller minimum cross-sectional dimension than the lever section 17 between the axis of rotation x and the pivot connection of the movable handle part 5.

The Figures 29 to 34 show a pair of press jaws with press jaws 6 and 7 in a second embodiment. The ribs 29 and 31 of both pressing jaws 6 and 7 are provided with a bulge 60 with respect to the respective ridge line 56.

In the longitudinal direction of the ridge line 56, there is a straight region 61 on both sides of the protrusion 60. These rectilinear regions 61 are arranged along a base line 62 connecting the ends of the ridge line 56, beyond which base line 62 the protrusion 60 extends in the direction of the press jaw opening 33 is directed.

According to the exemplary embodiment shown, the protrusion 60 can be of a convex shape, with reference to a floor plan as shown in Figure 31 circular line segment shaped.

The protrusions 60 of a set of ribs 54 and 55 lie in overlap with one another with respect to a view against the pressing jaw 6 and 7 on the rib end face 30, 32.

The extension dimension e of the protrusion 60 beyond the imaginary base line 62, in particular in the area of a highest point 63 that is furthest away perpendicular to the base line 62, corresponds in the exemplary embodiment shown to approximately one-fortieth to one-thirtieth of the largest free extension length f of the base line 62, which occurs when the press jaw opening 33 is initially closed (cf. Fig. 31 and the associated magnification).

According to the exemplary embodiment shown, the length g of the protuberance 60 viewed in the direction of extension of the base line 62 can correspond to approximately one seventh to a quarter, further approximately one fifth of the above-described extension length f of the base line 62.

As can be seen in particular from the illustration in Figure 31 As can be seen, the protrusion 60 is arranged off-center with respect to the associated base line 62 of the ridge line 56, at least when the press jaw opening 33 is initially closed, with respect to a center line M running perpendicular to the base line 62. The protrusion 60 can thus be arranged completely off-center, correspondingly over its entire length g.

In addition, the eccentric displacement of the protrusion 60 with respect to the central axis M in the direction of the crossing base line 62 of the immediately adjacent rib 29 or 31 of the same press jaw 6 or 7, which runs at right angles to the base line 62 having the protrusion 60, can be given. With a view to the rib end face 30 or 32, the protrusion 60 is correspondingly offset eccentrically with respect to the central axis M in the direction of the gusset formed by the ribs of the same press jaw.

A first straight region 61 of the ridge line 56 extends out of this gusset, with a length k which can correspond to approximately 0.3 to 0.8 times the length g of the bulge 60, preferably approximately 0.5 subjects.

The other rectilinear region 61 of the ridge line 56 adjoining the protrusion 60 is chosen to be significantly larger in terms of its length h than the above-described rectilinear region, and thus has a length h that is approximately 1.5 to 2.5 times. can further correspond to approximately 2 times the length of the protrusion 60.

The Figures 32 to 34 show successive intermediate positions in the course of a pressing process using pressing jaws of the second embodiment.

A workpiece W in the form of a wire end sleeve 57 with conductor ends 58 summarized therein is placed in the press jaw opening 33. The wall 59 of the wire end sleeve 57 initially has a circular cross section in the compression area, ie in the non-formed state, as shown in Figure 32 on. The conductor ends 58 are held loosely in the wire end sleeve 57 in this position, ie not pulled off.

As the ribs 29 and 31 of the pressing jaws 6 and 7 move into one another, the protrusions 60 first come into contact with the outer wall surface of the wire end sleeve 57 in the area of the rib-side ridge lines 56.

With the help of the protrusions 60, concave wall sections 64 are formed into the wall 59 of the wire end sleeve 57 as the pressing jaws 6 and 7 move further into one another. Here, at the same time, the wall material is preferably diverted into the gussets between the mutually facing ribs 29 and 31 of the pressing jaws 6 and 7, which result transversely to the retraction direction r, by forming and thereby along the straight-line areas 61 of the ridge lines 56, which may be longer in this pressing jaw position Corresponding wall sections with a straight cross-section are formed. Two immediately successive such straight wall sections of the wire end sleeve 57 form an angle of approximately 90 degrees to one another.

These straight wall sections end in concave wall sections 64 formed by the protrusions 60 (cf. Fig. 33 ).

As the pressing jaws 6 and 7 move further into one another until the pressing end position is reached Figure 34 The wall 59 of the wire end sleeve 57 is preferably also pushed into the gussets between the ribs of a pressing jaw 6 and 7 pointing in the retraction direction r, correspondingly adapted to the shorter, straight-line regions 61 of the ridge line 56 adjoining the protrusion 60.

To press smaller workpiece cross-sections, the pressing jaws 6 and 7 move further together. The pressing takes place with a smaller cross-sectional press jaw opening 33. This results in a shortening of the length of the section of the longer, straight-running region 61 used for pressing, due to the interlocking. This means that on the pressed workpiece W, for example a wire end sleeve 57, relative to one Cross section on both sides of the concave wall section 64 also connect straight wall sections of approximately the same length. The entire wall leg can also have a substantially concave curvature, especially with the smallest cross sections, possibly merging directly into the corner areas.

In the deformed end position of the wire end sleeve 57, this results in an overall essentially rectangular, particularly square cross-section with concave wall sections 64, which, in accordance with the material thickness of the ribs 29 and 31, are on the wall side of the wire end sleeve 57 as shown in Figure 35 adjust mutually. The upper concave wall sections 64 shown in this illustration are formed by the protrusions 60 of the ribs 29 of one of the pairs of ribs 54 or 55 in the pressing jaw 6, while the lower concave wall sections 64 shown in the illustration are formed by the protrusions 60 of the ribs 31 a group of ribs 54 or 55 of the press jaw 7.

The width m of a concave wall section 64 viewed in the workpiece longitudinal direction WL is dependent on the rib thickness or thickness of the end face viewed perpendicular to the longitudinal rib direction R, which at the same time preferably also specifies the relevant thickness of the protrusion 60.

The offset of the upper concave wall sections 64 to the lower concave wall sections 64 corresponds to the offset of the interlocking ribs of a press jaw 6 or 7, whereby a distance n is established which approximately corresponds to the width dimension m. This also results in a distance p between two concave wall sections 64 arranged next to one another in the longitudinal direction WL of the workpiece, which distance p depends on the distance between two rectified ribs of a set of ribs 54 or 55 of a press jaw 6 or 7 to one another. As is also preferred, the distance p can correspond to approximately 2 times the width m of a wall section 64.

As in Figure 34 shown, the proposed method using pressing jaws with protrusions 60 can result in a "homogeneous" ferrule 57 completely filled with conductor ends 58, which leaves empty areas in the cross section that could lead to the gripped conductor ends 58 becoming loose. <b><u>List of reference symbols</u></b> 1 Pressing pliers 29 rib 2 Plier jaw 30 Rib face 3 Plier jaw 31 rib 4 Handle part 32 Rib face 5 Handle part 33 Press jaw opening 6 Press jaw 34 face 7 Press jaw 35 contour line 8th cheek part 36 flank contour 9 Handle cover 37 flattening 10 Handle cover 38 Leadership advantage 11 stop section 39 Entry opening 12 Cones 40 surface 13 Feather 41 subsurface 14 Cones 42 surface 15 Lever part 43 Pivot 16 Lever section 44 deepening 17 Lever section 45 Plug-in part 18 Ratchet arm 46 channel 19 Ratchet section 47 Swivel joint 20 pawl 48 Pivot pin 21 Tension spring 49 Guide jaw 22 Control part 50 cavity 23 Bracket part 51 stop section 24 Bracket section 52 Cones 25 Stop connection 53 Long hole 26 Bracket section 54 rib share 27 stable connection 55 rib share 28 Basic body 56 Ridge line 57 ferrule F Guide surface 58 conductor ends H Height 59 wall K Knee joint arrangement 60 bulging M Centerline 61 Area R Rib longitudinal direction 62 Baseline S face 63 the highest point W workpiece 64 wall section WL workpiece longitudinal direction a Centerline b cross-section b' cross-section c Distance d thickness e Extension dimension f Extension length G length H length k length l length m Width n Distance p Distance r Direction of convergence u Pivot axis x Axis of rotation y Axis of rotation e.g Axis of rotation

Claims (15)

Pressing pliers (1) with two pliers jaws (2, 3), which are provided with oppositely arranged pressing jaws (6, 7), the pressing jaws (6, 7) rotating together about an axis of rotation directed in the direction of the pressing jaws (6, 7) moving together (z) are rotatable, wherein the pressing jaws (6, 7) can also be rotated about the axis of rotation (z) even in the collapsed state without hindrance by a pliers jaw (2, 3) and a pressing jaw (6, 7) has a pivot pin (43) has, characterized in that the pivot pin (43) is mounted for pivoting in one of the pliers jaws (2, 3), and that rotating the pressing jaw (6) around the pivot pin (43) in a mounted position of the pressing jaws (6, 7 ) can be done. Pressing pliers according to claim 1, characterized in that the rotation about the axis of rotation is continuous or gradual. Pressing pliers according to one of the preceding claims, characterized in that a pressing jaw (6, 7) can be dismantled from the pivot (43). Pressing pliers according to one of the preceding claims, characterized in that the pivot (43) passes through a lower surface (41) of a base body of a press jaw and is seated in a shape-adapted recess (44) of the base body (28) of the press jaw (6, 7). Pressing pliers according to one of the preceding claims, characterized in that a holder for the pivot pin (43) is formed by a plug-in part (45) which is received in a form-fitting manner both on the pivot pin (43) and on the pressing jaw (6, 7). Pressing pliers according to claim 5, characterized in that the plug-in part (45) is U-shaped and/or resilient. Pressing pliers according to one of the preceding claims, characterized in that the pivot pin (43) is received in the associated pliers jaw (2, 3) in a pivot joint (47) for pivoting about a pivot axis (u) running transversely to the axis of rotation (z), wherein when the pressing jaw (6, 7) is released from the opposite pliers jaw (2, 3), the pressing jaws (6, 7) can be rotated individually or together in the direction of the axis of rotation (z) from the pliers mouth. Pressing pliers according to claim 7, characterized in that a pivot pin (48) is formed on the pivot pin (43) in an extension of the section received in a base body (28) of the pressing jaw (6, 7). Pressing pliers according to claim 8, characterized in that the pivot pin (48) is covered on both ends by guide jaws (49) which are enlarged compared to the pin diameter. Pressing pliers according to one of claims 8 or 9, characterized in that the pivot pin (48) is received in a shape-adapted cavity (50) of the associated pliers jaw (2, 3). Pressing pliers according to claim 10, characterized in that the cavity (50) extends in cross section beyond half the circumferential extent of the pivot pin (48) for captively holding the pivot pin (43). Pressing pliers according to one of the preceding claims, characterized in that the pressing jaws (6, 7) have ribs (29, 31) running in a longitudinal direction of the ribs, which move into one another during pressing and that one transverse to the longitudinal direction of the ribs (R) outside a working area of the ribs (29, 31) extending guide surface (F) is formed, which cooperates with a guide projection (38) extending from the opposite pressing jaw (6, 7). Pressing pliers according to claim 12, characterized in that guide projections (38) are formed on each pressing jaw (6, 7) opposite the rib longitudinal direction (R). Pressing tongs according to claim 13, characterized in that the opposite guide projections (38) are formed multiple times on a first side of the pressing jaw (6, 7), with an entry opening remaining transversely to the longitudinal direction of the ribs. Pressing pliers according to one of claims 12 to 14, characterized in that the guide surface (F) is formed on one pressing jaw (6) and the guiding projection (38) is formed on the other pressing jaw (7), and that the guiding projection (38) extends along a assigned rib end face (30, 32).

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