DE19910838A1 - Pliers for crimping conductor-core end sleeves, has rib like projections formed on square profile surfaces of pressure dies in direction of respective profile longitudinal axis - Google Patents

Abstract

The pliers include lever arms (7,8) with pressure dies (9,10) of square pressing profiles with respect to pliers longitudinal axis (13) for biting into corresponding flanks, and rib like projections formed on profile surfaces of pressure dies in the direction of respective profile longitudinal axis.

Description

The invention relates to a pair of pliers for crimping ferrules electrical conductors that have at least one pair around a hinge pin swiveling to and from movable press jaws, in which a or multiple cooperating pairs of dies are. Such pressing tools are generally known and have found practical application in various embodiments (Company brochures from KNIPEX-Werk, Wuppertal, models 971 to 977; 09.92) (DE-PS 10 87 200; DE-PS 11 02 846; DE-PS 42 35 535; EP-PS 0188018).

To use such pliers in both electrical and mechanical Regarding perfect connections between electrical conductors and To get ferrules, it is important that the Press the respective press dies in a correct, appropriate position move to each other and on the other that when pressing one as intimate as possible perfect contact area to each other connecting parts is produced or manufactured.

There are many different ways to meet these usage requirements Crimping or crimping molds for cable lugs, sockets or Wire end sleeves, for example in round shape, hexagon or square, too with additional longitudinal squeezing recesses or with across running crimping has been applied. This Demands for always reliable and deductible Crimp connections have recently increased by another for example in the field of fine or control electronics with such Manufacture mentioned contact elements square crimp connections that can also meet these growing quality requirements. Here  there are still specific requirements for the crimping tools that for small and smallest press cross-sections are to be designed on wire end ferrules. As is known, special care must be taken to work with them small wire dimensions, no risk of grouting errors.

These requirements for a more perfect pressing technology result the purpose and object of the present invention.

These consist of creating a pair of pliers, which on the one hand have a plurality provides different sized presses that continue in Relative to their manufacturing ability a lower cost requires and on the other hand in relation to the function-specific Training of the press profiles improved mechanical and mechanical crimping effects electrical performance characteristics can be achieved.

This task is solved with the help of pliers construction, such as it is characterized in claim 1, being in the connected Advantageous further developments are included in the subclaims.

With the pliers design designed according to the invention, the Use of high quality tool steel reduced by only the Pliers jaws are made from the best tool steel, while the Pliers handle parts should consist of ordinary carbon steel.

This proposed solution also makes it technologically more favorable and to achieve more precise manufacture of the jaws where it obviously it comes down to high fit with regard to the Bringing together the respectively associated square or to achieve or guarantee prism-shaped die shapes because from this property the quality of the crimping is very essential is co-determined. This claim high, even under the influence of initiated press forces to guarantee accuracy of fit is according to the proposed invention, the advantageous design of each other assigned press dies by one half each  Press die shape in the other, opposite complementary Half of the die shape is guided laterally and thus against lateral forces is supported.

The claim for the best possible crimping or crimping effect Finally, the solution according to the invention in relation to the design of the Press die forms are sufficient by using the surfaces of the die forms web-like or rib-like projections are provided during the pressing e.g. B. a ferrule, in the longitudinal extension of all of them Create several notches in a row on the outer surfaces. This notches with only a reasonable depth of form are in Combined with the square pressing sought here, the safe guarantee for the best possible crimping effect, and with little electrical volume resistance also the required strength is secured on the ladder.

The invention is illustrated below with the aid of a drawing Embodiment are briefly explained.

The corresponding drawing shows in

Figure 1 is a partial side view of the pliers with pliers handle parts firmly inserted into the pliers jaws in the closed state.

Figure 2 shows the side view of two associated tongs bake with their press dies facing each other.

Figure 3 shows the enlarged section of a press die form.

Fig. 4 shows the enlarged cross section of a press die shape with web or rib-like projections worked on its pressing surface.

The pliers shown in Figure 1 is designed in a known design and made of separately manufactured jaws 1 ; 2 as well as part of pliers handle 3 ; 4 joined together for example with the aid of rivet bolts 5 .

The jaws 1 ; 2 are pivotable about the hinge pin 6 , designed as a two-armed lever and each carry a plurality of pressing dies 9 and 10 on their lever arms on both sides, the lever arms 7 on the mouth side and the lever arms 8 on the handle side. These are advantageously designed as square press profiles and, with their side flanks 11 and 12, are each able to plunge into the opposite counter profile in a form-fitting manner, as can be seen in FIG. 1, particularly clearly on the press dies 10 on the handle side. As a result, under the influence of the pressing and forming forces, a fitting closing of the pressing dies and thus a correct, accurate pressing is guaranteed.

The square press profiles of the press dies 9 ; 10 are in relation to the pliers longitudinal axis 13 standing on the tip in the pliers jaws 1 ; 2 incorporated and wear on the facing profile surfaces of the press dies 9 ; 10 in the direction of the respective longitudinal axis of the profile, a plurality of webs or rib-like projections 14 arranged next to or behind one another. These protrusions 14 leave a plurality of notches on the wire end sleeves during and after the pressing, which ensure good electrical contact and a high pull-off strength of the sleeve body from the conductor wire and guarantee. They are expediently arranged circumferentially within the die forms, but can also be provided offset with respect to one another, and are also rounded on their active surfaces, as is indicated in FIG. 4.

List of reference numbers

1

Pliers jaws

2nd

Pliers jaws

3rd

Pliers handle parts

4th

Pliers handle parts

5

Rivet bolts

6

Hinge pin

7

lever arm on the mouth side

8th

lever arm on the handle side

9

Press dies

10th

Press dies

11

Side flanks

12th

Side flanks

13

Longitudinal pliers axis

14

Bridges or rib-like projections

Claims (3)

1. Pliers for crimping wire end sleeves or the like to electrical conductors which have at least one pair of swiveling press jaws which can be swiveled to and from one another, in which one or more cooperating pairs of press dies are arranged, characterized by the following features:

• - The pliers are made up of separately manufactured pliers jaws ( 1 ; 2 ) and separately manufactured pliers handle parts ( 3 ; 4 ) articulated on the pliers jaws;
• - The jaws ( 1 ; 2 ) are designed with respect to their common hinge point as a two-armed lever, a mouth-side and a handle-side lever arm ( 7 ; 8 );
• - In each of the lever arms ( 7 ; 8 ) a plurality of press dies ( 9 ; 10 ) are incorporated lying side by side;
• - The press dies ( 9 ; 10 ) are designed as square press profiles, which in their side flanks ( 11 ; 12 ) are each able to plunge partially positively into their counter profile;
• - The square press profiles are incorporated in the pliers jaws ( 1 ; 2 ) standing on the tip in relation to the longitudinal axis of the pliers ( 13 );
• - On the mutually facing profile surfaces of the press dies ( 9 ; 10 ) are arranged in the direction of the respective longitudinal axis of a plurality of adjacent web or rib-like projections ( 14 ).

2. Pliers according to claim 1, characterized in that the web-like and rib-like projections ( 14 ) within the press dies ( 9 ; 10 ) are circumferential. 3. Pliers according to claim 1 and 2, characterized in that the web and rib-like projections ( 14 ) are profiled out on their active surfaces.