EP2873122B1 - Crimping tool for wire end sleeve - Google Patents

Description

The present invention relates to a crimping tool according to the preamble of claim 1.

Such crimping tools are known from the prior art. Thus, in the generic DE 195 07 347 C1 a crimping pliers for wire end sleeves described in which the force-way compensating device realized by an integrated into the one grip part and fixed, brought into action with a lever arm of the toggle lever spring lever and a located in the central portion of the fixed grip portion cross-sectional reduction in the form of a constriction as a spring is.

However, the thus realized force-displacement compensating device allows only a very limited diameter range of wire end ferrules, which can be pressed in the pressing tongs.

However, it is desirable to have a crimping tool for wire end ferrules that allows the crimping of wire end ferrules on conductors in the largest possible diameter range, so that the widest possible range of conductor cross sections can be provided with ferrules with a single crimping tool.

The invention is therefore based on the object to provide a crimping tool for wire end ferrules, which avoids the aforementioned disadvantages.

The invention achieves the object by the subject matter of claim 1.

The invention is therefore based on the idea to provide an increased force and an enlarged path for the force-displacement compensating device for the crimping tool to be created by the advantageous spring effect through the interaction of the springs. This ensures that can be crimped with the crimping tool ferrules or the like or conductor with the largest possible diameter range. This is the in the aforementioned Leave the state of the art taken way and realized the force-displacement compensating device in a completely different way.

The spring or the part of the cascade spring which is part of the respective base plates is in each case realized by an incision in the base plates, which according to a preferred embodiment runs parallel to the outer contour of the base plate. To reduce the mechanical stress at the end point of the incision, the end point of the incision is made rounded. The incision circulates in its contour advantageously the hinge pin and opens at the top of the handle from the base plate. The spring is thus preferably substantially each a geometry in the form of an arcuate, preferably circular arc segment-shaped leaf spring. In order to realize a significant travel, the incision is preferably made correspondingly long and wide. The thus realized spring is thus outside the handle. The arrangement of the incision in the two base plates thus results in a parallel connection of the two springs.

The crimping dies preferably have circular blind holes on their side surfaces, via which the crimping dies are rotatably mounted on bearing journals on the base metal sheets. The non-continuous bearing pin of the crimping die advantageously results in a correspondingly larger load-bearing cross-section of the crimping die, so that the crimping dies have an increased mechanical load capacity compared with comparable constructions with continuous bearing journals.

The Gleitstückplatte further preferably has a breakthrough in the form of a hexalobular profile, are rotatably mounted in the sliders and transmit the driving force resulting from the toggle kinematics on the crimping dies. By a groove in the sliders, a radial length compensation for the crimping dies is made possible, which results from the rotational movement of the crimping dies. The advantage of this solution lies in a surface contact and thus in a reduced local surface pressure between slider and crimping die over the entire actuation path.

For an optimized compression and to reduce the fracture sensitivity of the crimped wire end ferrule, the crimp dies preferably advantageously have a wave-shaped contour on the punch surface. A sharp-edged design, such as Triangular or square contours on the punch surface would, in comparison, leave a sharp-edged impression on the finished crimped ferrule, which would increase the fragility of the crimped ferrule. In order to prevent jamming of wire end ferrules of smaller cross sections between the crimping dies, the contour of the stamping effective surface is advantageously designed such that adjacent crimping dies engage one another congruently.

The contour of the punch effective surface of the crimping die is further designed so that with appropriate positioning of the wire end ferrule into the crimp die at the end of the wire end ferrule an insertion beveled, which simplifies the insertion of the wire end ferrule into a clamping system.

Further advantageous embodiments of the crimping tool according to the invention for wire end ferrules can be found in the dependent claims.

Embodiments of a crimping tool according to the invention for wire end ferrules are shown in the drawings and will be described in more detail below.

Figur 1:

eine Schnittdarstellung eines erfindungsgemäßen Crimpwerkzeugs für Aderendhülsen;

Figur 2:

eine Vorderansicht eines erfindungsgemäßen Crimpwerkzeuges für Aderendhülsen;

Figur 3:

eine Ausschnittsvergrößerung der Vorderansicht aus Fig. 2 eines erfindungsgemäßen Crimpwerkzeuges für Aderendhülsen, die insbesondere die zusammenwirkenden Crimpstempel zeigt;

Figur 4:

eine Schnittdarstellung eines erfindungsgemäßen Crimpwerkzeugs für Aderendhülsen, in der die für die Antriebsmechanik des Crimpwerkzeugs relevanten Bauteile hervorgehoben sind;

Figur 5:

eine Ausschnittsvergrößerung der Schnittdarstellung aus Fig. 4 eines erfindungsgemäßen Crimpwerkzeuges für Aderendhülsen, die insbesondere die für die Antriebsmechanik des Crimpwerkzeugs relevanten Bauteile im Bereich des eigentlichen Werkszeugs zeigt;

Figur 6:

eine Vorderansicht eines erfindungsgemäßen Crimpwerkzeuges für Aderendhülsen bei der sich eine erfindungsgemäße Kaskadenfeder in Grundstellung befindet;

Figur 7

eine Vorderansicht eines erfindungsgemäßen Crimpwerkzeuges für Aderendhülsen, bei der sich eine erfindungsgemäße Kaskadenfeder in maximaler Auslenkung befindet;

Figur 8

eine Schnittdarstellung eines erfindungsgemäßen Crimpwerkzeugs für Aderendhülsen, in der ein erfindungsgemäßes Anschlagfenster mit dazugehörigem Bolzen in geschlossener Stellung des Crimpgesenks gezeigt wird;

Figur 9

eine Schnittdarstellung eines erfindungsgemäßen Crimpwerkzeugs für Aderendhülsen, in der ein erfindungsgemäßes Anschlagfenster mit dazugehörigem Bolzen in geöffneter Stellung des Crimpgesenks gezeigt wird;

Figur 10:

eine räumliche Ansicht einer Ausschnittsvergrößerung der Schnittdarstellung aus Fig. 4 eines erfindungsgemäßen Crimpwerkzeuges für Aderendhülsen, die insbesondere die zusammenwirkenden Crimpstempel detailliert zeigt;

Figur 11:

eine räumliche Ansicht eines Crimpstempels;

Figur 12:

eine Vorderansicht zweier zusammenwirkender Crimpstempel;

Figur 13:

eine räumliche Ansicht einer Leiterader mit abisoliertem Ende und durch ein erfindungsgemäßes Crimpwerkzeug für Aderendhülsen aufgecrimpte Aderendhülse;

Figur 14:

eine Vorderansicht eines erfindungsgemäßen Crimpwerkzeuges für Aderendhülsen mit einem Crimpgesenk für einen Vierkantcrimp, wobei das Crimpgesenk geöffnet ist;

Figur 15:

eine Vorderansicht eines erfindungsgemäßen Crimpwerkzeuges für Aderendhülsen mit einem Crimpgesenk für einen Vierkantcrimp, wobei das Crimpgesenk auf Block gefahren ist;

Show it:

FIG. 1:

a sectional view of a crimping tool according to the invention for wire end ferrules;

FIG. 2:

a front view of a crimping tool according to the invention for wire end ferrules;

FIG. 3:

an enlarged detail of the front view Fig. 2 a crimping tool according to the invention for wire end ferrules, which in particular shows the cooperating crimping dies;

FIG. 4:

a sectional view of a crimping tool according to the invention for wire end ferrules, in which the components relevant to the drive mechanism of the crimping tool are highlighted;

FIG. 5:

an enlarged detail of the sectional view Fig. 4 a crimping tool according to the invention for wire end ferrules, which in particular shows the components relevant for the drive mechanism of the crimping tool in the region of the actual tool;

FIG. 6:

a front view of a crimping tool according to the invention for wire end ferrules in which a cascade spring according to the invention is in the basic position;

FIG. 7

a front view of a crimping tool according to the invention for wire end sleeves, in which a cascade spring according to the invention is in maximum deflection;

FIG. 8

a sectional view of a crimping tool according to the invention for wire end ferrules, in which an inventive stop window with associated bolt in the closed position of the crimping die is shown;

FIG. 9

a sectional view of a crimping tool according to the invention for wire end ferrules, in which an inventive stop window is shown with associated bolt in the open position of the crimping die;

FIG. 10:

a spatial view of an enlarged detail of the sectional view Fig. 4 a crimping tool according to the invention for wire end ferrules, which shows in particular the cooperating crimping dies in detail;

FIG. 11:

a spatial view of a crimping die;

FIG. 12:

a front view of two cooperating crimping dies;

FIG. 13:

a spatial view of a conductor wire with stripped end and by a crimping tool according to the invention for wire end ferrules crimped wire end sleeve;

FIG. 14:

a front view of a crimping tool according to the invention for wire end ferrules with a crimp die for a square crimp, wherein the crimping die is opened;

FIG. 15:

a front view of a crimping tool according to the invention for wire end ferrules with a crimp die for a square crimp, wherein the crimping die has moved to block;

In Fig. 1 is an inventive crimping tool 1 for crimping ferrules 2 (not shown), contact sockets, cable lugs or the like on electrical conductors 3 (not shown) shown. The hand-operated crimping tool 1 in the form of a pliers comprises a crimping die 4 with automatic adjustment to the crimping sleeve and conductor cross-section to be processed, which is formed from a plurality of crimping dies 5. The pressed ferrule 2 can be designed in particular in hexagonal or square shape.

The crimping tool 1 has two base plates 6, between which essential components of the crimping tool 1 are mounted. Between two base plates 6, coaxial with the circular opening 7 (not shown) in the base plates 6, the oää performing a with a wire end ferrule 2 or similar. serve to crimping conductor 3, there is a Gleitstückplatte 8. The Gleitstückplatte 8 takes the four ( Fig. 14 ) or six Crimpstempeln 5 formed Crimpgesenk 4. The crimping dies 5 are each rotatably mounted via bearing journals 9 and guided axially via a groove 11 incorporated into a slider 10 (not shown). The slider 10 has a cylindrical basic geometry and is rotatably mounted in the Gleitstückplatte 8. By a by a bolt 12 and a relative to the stationary pin 12 movable recess 13 formed Drehwinkelbegrenzung on Gleitstückplatte 8, the maximum angle of rotation of Gleitstückplatte 8 and thus the minimum and maximum opening of the crimping die 4 defined. The two base plates 6 are bolted together by the bolt 12 and by a further bolt 13.

To close the crimping die 4, the crimping tool 1 has a toggle kinematics 14. The toggle kinematics 14 is clamped between the hinge pins 15, 16 and an eccentric pin 17. The hinge points that form the two hinge pins 15, 16 are connected by a push bar 18, wherein the hinge pin 15 is additionally connected to the base plates 6 and the hinge pin 16 in addition to a lever 19. The thrust strut 18 is supported at rest on a rounded projection 20 (not shown), which is an integral part of the slider 10.

By turning the eccentric pin 17, the basic position of the crimping die 4 can be changed. As a result, the degree of opening of the opened crimp die 4 can be adapted to the diameter of the wire end ferrule 2 before crimping, so that a substantial part of the working stroke of the crimp die 4 need not be carried out merely as an unproductive idle stroke until the crimp die 4 comes into contact with the wire end ferrule 2 , The adjusting disc 21 and the flat head screw 22 fix the eccentric pin 17 in the set position. The eccentric pin 117 serves only for basic adjustment and possibly the compensation of manufacturing tolerances. Usually, the eccentric pin 117 is not adjusted by the user of the crimping tool.

Thus, the crimping die 4 is always safely operated to the end stop, the thrust strut 18 has a toothing 23, in which the lock 24 engages and thus prevents premature opening of the crimping die 4. The compression spring 25 ensures the self-opening of the crimping die 4 after the crimping of the ferrule 2.

In Fig. 2 respectively. Fig. 3 a ferrule 2 is shown, which was introduced into the opened crimping die 4. By hand-operated feeding the handles 26, 27 of the crimping tool 1 to each other, the ferrule 2 is crimped on the conductor 3 (not shown). It is essential to the invention that the handles 26, 27 or the components 19, 6 enclosed by the handles 26, 27 do not undergo local cross-sectional reductions or Weakening, eg in the form of a constriction, from which increased elasticity or increased spring action would result.

In Fig. 4 or 5 the drive mechanism of a crimping tool 1 according to the invention for wire end ferrules 2 is illustrated. By operating the lever 19, the toggle kinematics 14 is further brought into the extended position, whereby the Gleitstückplatte 8 performs a rotational movement in a clockwise direction. The radial bearing of the Gleitstückplatte 8 is ensured by the contact in the areas L between the Crimpstempeln 5 and slide plate 8. The sliding plates 8 has an opening in the form of a hexalobular profile in which the sliders 10 are rotatably mounted and transmit the driving force resulting from the toggle kinematics 14 on the crimping die 5. Through the groove 11 in the sliders 10, a radial length compensation for the crimping die 5 is made possible, which is caused by the rotational movement of the crimping die 5. The advantage of this solution lies in a surface contact and thus in a reduced local surface pressure between slider 10 and crimping die 5 over the entire actuation path.

The crimping dies 5 have circular blind holes 28 on the side surfaces, via which the crimping dies 5 are rotatably mounted on bearing pins 9 on the base plates 6. Due to the non-continuous bearing pin 9 of the crimping die 5 results in a correspondingly larger load-bearing cross-section of the crimping die 5, so that the crimping die 5 compared to comparable constructions with continuous bearing pin 9 have an increased mechanical strength. The pivoting movement of the crimping dies 5 produces a continuously decreasing opening 7 of the crimping die 4, in which the wire end ferrule 2 (not shown) is pressed.

In order to be able to process the different ferrule and conductor cross sections in a crimp die 4, a force-displacement compensating device in the form of a cascade spring 29 is integrated in each case in the base plate 6, which makes it possible to escape the rear knee pivot point in the direction of the arrow (see Fig. 6 or 7). In each case over the surface H on the base plate 6, the second spring 31 of the cascade spring 29 is driven via the cylindrical pin 30. The spring 31 is located on the same plane as the thrust strut 18, which lies between the two base bleaches 6 and has - like the thrust strut 18 - a thickness which is virtually identical to the gap between the base plates 6. Due to the advantageous spring action of the interaction of the springs 31, 32, an increased force and an enlarged path for the force-displacement compensating device for the crimping tool to be created are made available.
The cascade spring 29 takes on the required residual stroke of the crimping die 4 as elastic deformation work when the crimping die 4 has already moved to block during the crimping of a ferrule 2, but still has to be covered, so that the barrier 24 releases the opening of the crimping die 4. The crimping tool 1 thus automatically adjusts to the sleeve and conductor cross-section to be crimped. The crimping tool 1 can be closed until the lock 24 is skipped and opens automatically.
The integration of the spring 32 as a parallel-connected leaf spring in the base plates 6 allows a compact design of the crimping tool 1 with simultaneous precise adjustment to the required force-displacement compensation. Compared to constructions, less space is required for the same performance.

The spring 32 is realized in each case in the base bleach 6 by a parallel to the outer contour of the base plate 6 extending incision 37 in the base plate 6. To reduce the mechanical stress at the end point 38 of the cut 37, the end point 38 of the cut 37 is made rounded. The incision 37 circumscribes the hinge pin 15 in its contour, so that the hinge pin 15 is in each case in the region of the base plate 6 in the spring 32 and otherwise in the thrust strut 18, and opens at the top of the handle 27 respectively from the base plate 6. The spring 32 thus essentially receives a respective geometry in the form of an arcuate or kreisbogenabschnittsförmigen leaf spring. In order to realize a significant travel, the incision 37 is designed to be correspondingly long and wide. The spring 32 is thus outside of the handle 27th

In order to prevent lifting of the surface H of cylindrical pin 30 and base plate 6 under load, the base plate 6 in each case in the region M has a cross-section with high rigidity. A deformation of the base plates 6 under load is thus prevented and realized a constant reproducible force-displacement.

In order to prevent overloading of the cascade spring 29, a stop window 33 is integrated with the edges I in the push bar 18, that in combination with a bolt 34 limits the travel of the spring 32 (see Fig. 8 or 9). The edges J of the stop window 33 in combination with the bolt 34 limit the open and closed positions of the crimping die 4.

In Fig. 10 . 11 and 12 the crimping dies 5 forming the crimping die 4 are shown in detail. For an optimized compression and to reduce the fracture sensitivity of the crimped ferrule 2, the crimping dies 5 have a wave-shaped contour 35 on the punch-effective surface 36. A sharp-edged design, such as triangular or square contours on the punch effective surface 36 would in comparison leave a sharp-edged impression on the finished crimped ferrule 2, which would increase the fracture sensitivity of the crimped ferrule 2. In order to prevent jamming of wire end sleeves 2 of smaller cross sections between the crimping dies 5, the contour 35 of the punching effective surface 36 is designed such that adjacent crimping dies 5 engage in one another congruently (see FIG Fig. 12 ). The contour 35 of the punch surface 36 of the crimping die 5 is designed so that with appropriate positioning of the ferrule 2 in the crimp die 4 at the end of the wire end ferrule 2, an insertion G is formed, which simplifies the insertion of the wire end ferrule 2 in a clamping system (not shown) (see Fig. 13 ).

In Fig. 14 is a crimping tool 1 shown with an open crimping die 4, which has four crimping dies 5 and thus forms a square crimp on a wire end ferrule. In Fig. 15 is a crimping tool 1 shown with a closed, run on block crimping die 4, which has four crimping dies 5.

Since the mode of operation of a crimping tool 1 with a crimping die 4, which has 4 crimping dies, is analogous to a crimping tool 1 with a crimping die 4 is that has six crimping punch 5 is to avoid repetition to a detailed description of this embodiment is omitted.

LIST OF REFERENCE NUMBERS

1

Crimp Tool

2

end sleeve

3

ladder

4

crimping die

5

crimping dies

6

base plate

7

opening

8th

slider plate

9

pivot

10

slide

11

groove

12

bolt

13

recess

14

Toggle kinematics

15

hinge pins

16

hinge pins

17

eccentric

18

Schubstrebe

19

lever

20

Rounded edge

21

adjustment disc

22

Flat headed screw

23

gearing

24

barrier

25

feather

26

Handle

27

Handle

28

blind

29

cascade spring

30

straight pin

31

feather

32

feather

33

stop window

34

bolt

35

contour

36

Stamp effective area

37

incision

38

endpoint

Claims (14)

1. A crimping tool (1) for wire end ferrules (2), female contacts, cable terminals or the like on electrical conductors (3), which comprises a crimping die (4) formed from at least four crimping stamps (5), which furthermore comprises base sheets (6) and at least one lever (19), with which an opening (7) of the crimping die (4) can be reduced in size via toggle joint kinematics (14), and comprises a force-path compensation device that is designed to receive a required remaining stroke of the crimping die (4) as elastic deformation work in the state in which the crimping die (4) has already been moved on block during the crimping of a wire end ferrule (2), but a path is still to be traversed such that a stopper (24) frees the opening of the crimping die (4), wherein the force-path compensation device is formed as a cascade spring (29) having a first spring (32) which is a part of the base sheets (6) and having a further spring (31) which is a further lever integrated between the base sheets (6), characterized in that the one spring (32) of the cascade spring (29), which is part of the base sheets (6), is formed by notches (37) in the base sheets (6), such that said spring (32) respectively substantially has a geometry in form of an arched leaf spring.
2. A crimping tool (1) according to claim 1, characterized in that the respective notch (37) extends substantially parallel to the outer contour of the base sheet (6).
3. A crimping tool (1) according to one of the previous claims, characterized in that the leaf spring has a geometry in the form of a leaf spring shaped like a circular arc section.
4. A crimping tool (1) according to one of the previous claims, characterized in that the crimping tool (1) comprises a sliding piece plate (8) for accommodating the crimping die (4), wherein the sliding piece plate (8) has a passage in the form of a hexagon round profile.
5. A crimping tool (1) according to one of the previous claims, characterized in that the crimping stamps (5) of the crimping die (4) are rotatably mounted by two respective bearing pins (9) ending in a blind hole (29) in the crimping stamp (5).
6. A crimping tool (1) according to one of the previous claims, characterized in that the crimping stamps (5) of the crimping die (4) are axially guided by a groove (11) incorporated in a sliding piece (10).
7. A crimping tool (1) according to one of the previous claims, characterized in that the sliding piece (10) has a cylindrical base geometry.
8. A crimping tool (1) according to one of the previous claims, characterized in that the sliding piece (10) is rotatably mounted in the sliding piece plate (8).
9. A crimping tool (1) according to one of the previous claims, characterized in that the crimping stamps (5) have an active stamping surface (36) with a corrugated contour (35).
10. A crimping tool (1) according to one of the previous claims, characterized in that the contour (35) of the active stamping surface (36) of the crimping stamps (5) of the crimping die (4) is formed in such a manner that adjacent crimping stamps (5) of the crimping die (4) engage into one another in a contour-congruent manner.
11. A crimping tool (1) according to one of the previous claims, characterized in that the contour (35) of the active stamping surface (36) of the crimping stamps (5) of the crimping die (4) is formed in such a manner that, given an appropriate positioning of the wire end ferrule (2) in the crimping die (4) at the end of the wire end ferrule (2), an insertion slope is produced.
12. A crimping tool (1) according to one of the previous claims, characterized in that the crimping tool (1) comprises an eccentric bolt (17) with which the base position of the crimping die (4) can be adjusted.
13. A crimping tool (1) according to one of the previous claims, characterized in that the crimping tool (1) comprises an adjusting disk (21) and a flat head screw (22) with which the eccentric bolt (17) is fixed in the adjusted position.
14. A crimping tool (1) according to one of the previous claims, characterized in that the crimping tool (1) comprises a pushing strut (18) into which a cogging (23) is worked, into which a stopper (24) engages and therefore prevents a premature opening of the crimping die (4).

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