WO2014114609A1

WO2014114609A1 - Crimping tool

Info

Publication number: WO2014114609A1
Application number: PCT/EP2014/051071
Authority: WO
Inventors: Horst Hofmann; Thomas Wagner; Ralf Legler; Michael Brückner
Original assignee: Rennsteig Werkzeuge Gmbh
Priority date: 2013-01-28
Filing date: 2014-01-21
Publication date: 2014-07-31
Also published as: EP2949014B1; EP2949014A1; PL2949014T3; DE102013100801A1

Abstract

The invention relates to a crimping tool (1), comprising crimping jaws (10), wherein the crimping jaws (10), in order to form a crimping region by means of associated end regions of the crimping dies, are supported in such a way that the crimping jaws can be rotated about an axis of rotation (11) in order to swivel into a crimping end position. The crimping jaws (10) also each comprise an action surface (13) forming part of the crimping region. In an outline of the crimping jaw (10) in which the axis of rotation (11) is represented as a point, the action surface (13) extends convexly and runs into a jaw tip (12) on the crimping region side. The jaw tip (12a) of a first crimping jaw (10a), in the course of the swiveling in, moves along the convex action surface (13) of an adjacent, simultaneously swiveling second crimping jaw (10b) in the direction of the jaw tip (12b) of said second crimping jaw (10b). In order to favorably design a crimping tool having a convexly extending action surface on a crimping jaw, the action surface (13) according to the invention is formed by a plurality of ribs (14), which extend from an action base surface (16) transversely to the axis of rotation (11).

Description

Crimping Tool

The invention relates to a crimping tool with crimping jaws, wherein the crimping jaws are rotatably mounted about an axis of rotation for pivoting into a crimping end position to form a crimping region by means of associated end regions of the crimping punch, the crimping jaws each further forming one part of the crimping region Have contact surface, the action surface in a plan view of the crimp jaw, in which the axis of rotation is punctiform, convexly extending and expires crimpbereichseitig in a jaw tip and the jaw tip of a first crimping jaw in the course of pivoting along the convex surface of an adjacent, simultaneously pivoting second Crimping jaw moves in the direction of the jaw tip of this second crimping jaw. Such crimping tools have already become known in many ways. For example, reference may be made to WO-Al-2010/000823 (US-A-2011/0094285) and US-A-3203078. In addition, reference is also made to US-B2-8220307. In the subject of the latter document is to avoid high frictional forces on a constant gap between a jaw tip and the convexly extending contact surface in the course of

Turned off turned. On the one hand, a constant gap can only be achieved with great effort in terms of production technology. On the other hand, it is also critical, if necessary, that folds or warping on a crimpling result from the gap.

Starting from the last-mentioned prior art, the invention is concerned with the task of designing a crimping tool with a convexly extending surface of action on a crimping die low. A possible solution of the problem is given according to a first idea of the invention in a crimping tool, in which the action surface is formed by a plurality of ribs extending from an action base and transverse to the axis of rotation. The fact that a plurality of ribs is provided, the absolute size of the action surface, and thus also possible frictional forces is reduced in the course of pivoting. In addition, there is also a favorable effect on the crimpling. According to the crimping surface on the crimping plate, which can be achieved by means of the ribs and is structured in accordance with the shape of the ribs, advantageously higher extraction forces can result with respect to one or more crimped electrical conductors. For example, a typical crimping involves the conductive compression of one or a plurality of metallic, cable-like conductors in a sleeve, such as a cable lug. In this case, it is also generally essential that any tensile forces on one or a plurality of casings may not lead to pulling out of the sleeve or the cable lug. The relevant extractable pull-out forces can be favorably influenced by the mentioned configuration of the crimping areas.

The fact that a convex profile of the action surface is given, at least in the critical region of the crimping, which is usually given at the end of Einschwenkbewegung, a cooperation without gap between the Crimpstempeln or with only a very small gap over a certain angular range of Achieve pivotal movement, so that effective unfolding or distortion can be counteracted at the Crimpling according to penetration into a gap.

Alternatively or in addition to the above-described embodiment is provided according to a further possible solution of the invention, that in the case of a convex action surface, wherein the action surface can also be formed in a conventional manner as an unstructured smooth surface, the gap between a Jaw tip and the action surface is given different sizes in the course of pivoting. This can be achieved by the course of the convex ground plan surface of the action surface. It is preferred in that at the end of a Einschwenkvorganges, for example over an angular range of 1 to 5 degrees, a significantly lower gap or even a concern of the jaw tip is given to the action surface as in an angle given at the beginning of the movement of the crimping. The gap may, for example, in a first angular range of Einschwenkbewegung, for example, extends over 2 to 15 degrees, in any case be greater than 2/10 mm, while it is in the said end portion of the Einschwenkbewegung 10 to 50 μιτι.

Further features of the invention are described below, also in the figure description and the drawing, often in their preferred assignment to the concepts already explained above or illustrated. However, they can also be of importance in an assignment to only one or more individual features that are described here or represented graphically, or independently or in a different overall concept. Thus, it is preferable that the distance of the jaw tip to the engagement surface of the adjacent crimping jaw when pivoting over the ground-resultant length of the action surface in this plan is one-tenth or less of the dimension of the crimping jaw from the rotation axis to the jaw tip in particular in the end region of the restriction movement. The distance can also be "zero" over an entire length of the action surface, given a correspondingly extremely precise design. A real measure of a dimension from the axis of rotation to the jaw tip of the crimping jaw is, for example, 3 to 20 mm. Furthermore, it is also preferred that in the case of the formation of said ribs, a rib is formed interrupted over its length. In this case, a multiple interruption can be provided. With regard to the plurality of ribs, which each form an action surface, the interruptions in said plan may be provided in alignment with each other. But they can also be provided, at least partially offset from each other.

The surface of action, from which the ribs rise, can run in a plan of different curvatures to the surface of action. The action surface can also run straight in the floor plan. The elevation given in relation to the length of the convex action surface compared to a straight line extending in the plan view between the jaw tip and a beginning of the action surface may be one-third to one-hundredth of said length.

The convex curvature can be formed at least in sections by a circular section line. The convex curvature can also be completely formed by a circular section line. A radius of such a circular section line is preferably greater than the distance between a jaw tip and the axis of rotation of a crimping jaw, based on a plan view of the crimping jaw, in which the geometric axis of rotation of the crimping jaw is depicted as a point. More preferably, the ratio between such a radius and the distance may be 1.1 or more; more preferably, it may be 2 or less, more preferably it is about 1.4. Here, depending on the specific embodiment, based on the value of, for example, 1.4, deviations upwards and downwards of up to 2 percent, for example, are possible.

In any case, the crimping dies are substantially star-shaped at the end of the pivoting-in movement, wherein they are concretely related to an imaginary coincidence. Telachse a crimping in their longitudinal extent each aligned with a lateral distance to the central axis.

Relative to such a star shape, the crimping dies can be acted upon by means of a loading part at their outer end areas for pivoting.

The crimping and the degree of pivoting is further preferably carried out in such a way that the crimped combination or the crimpling has sections running concavely in a cross section corresponding to the length of the sections of the action surfaces which are at an end of the pivoting movement with the combination to be crimped. This is such that in the corner-like transitions between two sections formed by adjacent contact surfaces there is no bulge over the imaginary extension of a plan line of the section.

Moreover, it is preferred that the sections have rib-like formations corresponding to a longitudinal axis of the crimping ring or in a direction parallel to a rotational axis of a crimping die. The rib-like formations may be formed uniformly continuous according to a first embodiment. According to a further embodiment, it is preferred that these rib-like formations are formed interrupted over the length of the ribs. In this case, a dot matrix can also be realized in each individual case.

The numerical ranges or ratio ranges given above and below also include, as far as not already indicated by way of example, all intermediate values as disclosed, in particular with regard to a one or multiple narrowing of the indicated range limits. limit in 1/10-step or 1/10-range boundaries, ie limited in a tenth step from the lower and / or upper limit to the respective other limit, in addition, also so-formed granular values are hereby disclosed. For example, if a ratio of between 1.1 and 1.3 is described, it is also 1.11 times to 3 times, 1.1 to 2.9 times, 1.2 to 2 , 8-fold etc. included in the disclosure.

The invention will be further explained with reference to the accompanying drawings, which, however, illustrate only one embodiment. Hereby shows:

1 shows a crimping pliers in a plan view;

Fig. 2 shows the object according to Figure 1, opened with respect to the functional parts.

3 shows a detail of the front regions of the crimping dies in a first starting position;

4 shows a representation according to FIG. 2, in a second initial representation; a view according to Figure 3 and Figure 4 in a crimp end position;

Fig. 6 is a perspective detail view of a crimping jaw; and

Fig. 7 is a plan view of a single crimping jaw.

Shown and described is a crimping tool 1, which has two pliers legs 2, 3, which are pivotally connected to each other in a rotary joint 4. Due to the further mutual support in the area 5, which is concretely given by a bearing shell 6 and a lever 7 supported pivotably therein, there is also a toggle lever transmission between the tong limbs 2, 3.

By a spring 8, in the embodiment concretely a tension spring, the pliers legs 2, 3 are biased in a crimp home position. In a pliers head 9 crimping jaws 10 are rotatably mounted about a respective axis of rotation 11. They can be pivoted by turning about the axis of rotation 11 - starting from a crimping starting position, see Figures 3 and 4 - in a crimping end position. The crimp jaws 10 have at their free end regions on a jaw tip 12, which merges on one side into an action surface 13, wherein in the figures 3 and 4 and 5, for example, the action surface 13 through which in the illustrated plan view, in which the axes of rotation 11 are punctiform is given by the referenced line.

The action surfaces 13a, 13b form in the crimp end position, compare approximately Figure 5, each part of the - given in the embodiment of Figure 5 four crimp jaws 10a, 10b, 10c, lOd - given crimp. A first jaw tip 12a of a first crimping jaw 10a moves in the course of pivoting the crimping jaw 10a along the convex action surface 13b of an adjacent, simultaneously pivoting second crimping jaw 10b in the direction of the jaw tip 12b of this second crimping jaw 10b, etc. As can be seen in particular from the perspective view of FIG. 6, the action surface 13 of a crimping jaw 10 according to this embodiment is formed by a plurality of ribs 14, specifically by a plurality of outside narrow sides 15 of this plurality of ribs 14.

The ribs 14 extend - starting from an action base 16 - which is given in the illustrated embodiment by the given between two adjacent ribs 14 rib valleys accordingly. The ribs 14 extend perpendicular to the action base 16 with respect to their height.

The ribs 14 further extend transversely to the axis of rotation 11 and with respect to a total length of a crimping jaw 10 in a longitudinal direction of the crimping jaw 10.

As can be seen further from FIG. 6, in the exemplary embodiment shown, the ribs 14 are designed to be interrupted in their longitudinal extent. A rib 14 thus consists of two or more rib sections 17. Alternatively, the ribs 14 may also be continuously formed in their longitudinal extension.

A distance a between two rib sections 17 in the longitudinal direction of a rib section 17 can be one-tenth to, for example, five times a width b, preferably measured at a rib foot, of a rib 14.

The crimp starting positions of the crimping jaws 10 in FIGS. 3 and 4 are assigned to different crimping diameters of, for example, sleeves. The starting position according to FIG. 3 is preferably given at a crimping start with respect to a sleeve having a cross-sectional area, in the uncrimped state, of approximately 1.5 to 2.5 mm ² , while the starting position according to FIG. 4 is for a crimping sleeve having a cross section of, for example, 10 to 16 mm ^{2 is} given in such a way.

It is further important that a distance c, measured on the shortest path, between a jaw tip 12 and the action surface 13 of the adjacent crimping jaw 10 in this starting position is comparatively large, while in the crimp end position according to Figure 5 is relatively small or an immediate Concerning the jaw tip 12 is given to the action surface 13. The comparatively large distance is preferably set with regard to a material thickness of a ferrule to be crimped. It preferably corresponds to twice that material thickness or less. The material thickness may for example be between 0.05 and 0.5 mm.

The course of the action base 16 shown in dashed lines in the illustrations can also be convex, as shown, more preferably in the same distance to the end face of the rib 14 over the length of a rib 14. However, the action base 16 can deviate therefrom as well be curved or straight running formed.

In Figure 7, a crimping jaw 10 is shown in individual representation, in plan view, so that the outline contour is visible. The crimp jaw 10 has a circular section line in plan view with respect to its action surface 13. This circular section line has a radius R. Further, a distance d is given between the geometric axis of rotation 11 and the jaw tip 12. It has now been found that it is advantageous to provide the radius R in a certain ratio to the distance a. This ratio is preferably provided such that the radius R is greater than the distance d. Further preferred zugt is the ratio of the radius R to the distance d 1.1 or more. In addition, the ratio is preferably 2 or less. Particularly preferred is the ratio of about 1.4, depending on the specific geometric configuration, in particular in the area of the jaw tip, based there on a larger or smaller rounding diameter of the jaw itself, this ratio may be different by 1 to 2 percent, in this case specifically related to the value 1.4.

All disclosed features are essential to the invention. The disclosure content of the associated / attached priority documents (copy of the prior application) is hereby also incorporated in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application. The subclaims characterize in their optionally sibling version independent inventive developments of the prior art, in particular to make on the basis of these claims divisional applications.

LIST OF REFERENCE NUMBERS

1 crimping tool a distance

2 pliers legs b width

3 pliers legs c distance

4 swivel d distance

5 area

6 bearing shell R radius

7 lever

8 spring

9 pliers head

10a first crimping jaw

10b second crimping jaw

11 axis of rotation

12a jaw tip

12b jaw tip

13 impact surface

13a impact surface

13b surface of action

14 rib

15 narrow side

16 impact area

17 rib section

Claims

1. Crimping pliers (1) with crimping jaws (10), wherein the crimping jaws (10), for forming a crimping region by means of assigned end regions of the crimping dies, are arranged around an axis of rotation (11) for swiveling into a crimping die.

The end positions are rotatably mounted, wherein the crimp jaws (10) further each have a part of the crimping area forming action surface (13), the action surface (13) in a plan view of the crimping jaw (10), in which the axis of rotation (11) is punctiform, is formed convexly extending and expires crimping range side in a jaw tip (12) and the jaw tip (12a) of a first crimping jaw (10a) in the course of pivoting along the convex action surface (13) of an adjacent, simultaneously pivoting second crimping jaw (10b) in the direction of Jaw tip (12b) of this second crimping jaw (10b) moved, characterized in that the action surface (13) by a

A plurality of ribs (14) is formed, which extend from an action base (16) and transversely to the axis of rotation (11).

2. crimping tool (1) according to the features of the preamble of claim 1 or claim 1, characterized in that at convex action surface (13) of the gap between a jaw tip (12) and the action surface (13) in the course of pivoting the crimping jaws (13) 10) is given different sizes. 3. Crimping tool according to one or more of the preceding claims, characterized in that a distance (c) of the jaw tip (12) to an action surface (13b) of an adjacent crimping jaw (10b) in the course of pivoting over the resultant in the plan length of Action surface (13) in this plan one tenth or less the dimension (distance (d)) of the crimping jaw (10) from the rotation axis (11) to the jaw tip (12) is.

Crimping tool according to claim 3, characterized in that the distance (c) in the course of pivoting is different.

Crimping tool according to one of the preceding claims, characterized in that a rib (14) is formed interrupted over its length.

Crimping tool according to one of claims 1 to 4, characterized in that a rib (14) is formed uninterrupted over its length.

Crimping tool according to one of the preceding claims, characterized in that the action base (16) in the floor plan is curved differently curved to the action surface (13).

Crimping tool according to one of claims 1 to 6, characterized in that the action base (16) in the plan is straight.

Crimping tool according to one of claims 1 to 7, characterized in that the action surface (13) is formed in a plan by a circular section line and a radius (R) of the circular section line is greater than a distance (d) between a jaw tip (12) and a rotation axis (11) in this plan.

A crimping tool according to claim 9, characterized in that a ratio between the radius (R) and the distance (d) is 1.1 or more.

11. Crimping tool according to claim 9 or 10, characterized in that the ratio is 2 or less.

12. Crimping tool according to one of claims 9 to 11, characterized in that the ratio is about 1.4.