EP0675564B1 - Slanting cutting clamp for connecting - Google Patents

Abstract

The clamp contact is made of sheet metal and has a pair of contact arms (4), rigidly coupled together at one end and separated from one another by the contact slit (3), receiving the electrical conductor. The contact zones (6) of the contact arms on either side of the contact slit are bent outwards in opposition to one another. Pref. the contact zones of the contact arms are offset from one another by a parallel displacement in the vicinity of the contact slit, to lie diagonally opposite one another. <IMAGE>

Description

The invention relates to an inclined Insulation displacement contact according to the preamble of Claim 1.

From DE 28 14 069 an oblique insulation displacement contact is known, in which the to be contacted Wire into the contact slot of the insulation displacement contact at an angle less than 90 ° (preferably between 30 ° and 60 °) is introduced. Through the Inclination of the contact slot to the axis of the The wire becomes diagonal when it is pressed into two notched opposite points. This will a firm contact with a sufficient Contact pressure achieved.

The well-known oblique insulation displacement contacts are for wires with a diameter smaller than 0.4 mm cannot be used because the two are on the contact notches diagonally opposite contact forces cause a resulting bending moment which deformed the wire to be contacted. If not enough The wire can then become stiff strong wire deformations come. The limit of stiffness is one diameter for copper wire of approximately 0.4 mm. Another disadvantage of the known oblique insulation displacement contacts is the Stiffness of the contact itself. So a more secure Contact between insulation displacement contact and wire occurs, must have sufficient rigidity of the Insulation displacement contact can be guaranteed, since otherwise the insulation displacement contact when the Wire deformed and insufficient contact force comes about. So the choice of materials for the insulation displacement contact through the specified one Contact geometry limited.

From DE 41 26 068 an oblique insulation displacement contact is known, in which the contact legs each about half the thickness of the leaf spring material moved to its front and back are, which limit the contact slot Contact edges of the contact legs over their entire Length are arranged parallel to each other. Hereby becomes an even width of the contact slot reached over its entire length, the Width of the contact slot in the range from 0 to 0.05 mm lies. This enables contacting very thin wires and strands as electrical conductors. Furthermore, there is greater stiffness of the insulation displacement contact achieved without large forces act on the housing receiving the insulation displacement contact. A disadvantage of these oblique insulation displacement contacts is that by twisting or Shear of the contact legs also the area of the contact legs, which is to be accommodated in the housing, gets wider. This problem could be narrowed down Dimensioning of the insulation displacement contact fixed but the narrowing of the insulation displacement contact has a reduction in stiffness the insulation displacement contact.

EP-A-0 121 224 discloses an insulation displacement contact with two or three contact legs previously known. There is an angle of 90 ° between the cable core and the contact. The Contact legs are forward and backward along the longitudinal axis of the contact turned. The two opposite cutting edges of the contact slot run therefore no longer parallel to each other, but wedge-shaped apart or together, so that the cable wire is contacted when the distance or the width of the Slot is smaller than the outer diameter of the conductive core of the insulated cable core. The cable wire is only at a certain point contacted.

US-A-3 892.460 and GB-A-2 040 607 insulation displacement contacts are known, which are wave-shaped. There is no inclination between the contacts and cable core. The wavy contact of US-A-3,892,460 shows any one Number of contact slots.

Furthermore, EP-A-0 051 103 describes a tool for connecting cable wires to free-standing ones Contacts known. The contacts are not kept in an insulating housing. An inclined contact is shown, the contact points of which are proportional are far apart so that no thin cable wires are contacted can without loops forming.

From DE-U-93 10 365 a insulation displacement contact is also previously known with an inclination between the contact and the cable core. This contact bends thin cable cores wavy, because the contact points from one another have a large distance.

The invention is therefore based on the object an oblique insulation displacement contact of the generic type Way to create that with wires too less rigidity than a copper wire from 0.4 mm diameter can be contacted, whereby the insulation displacement contact to be created in the previously used recordings of the housing should fit without that the rigidity of the insulation displacement contact is reduced.

Fig. 1

einen Schnitt durch ein Gehäuse mit einem schrägstehenden Schneid-Klemm-Kontakt gemäß dem Stand der Technik,

Fig.2

eine Draufsicht auf die Kontaktschenkel mit gemäß der Erfindung nach außen abgewinkelten Kontaktzonen und einem resultierenden Biegemoment null,

Fig.3

eine Draufsicht gemäß Fig. 2 mit einem resultierenden Biegemoment ungleich null,

Fig.4

eine Draufsicht auf die Kontaktschenkel mit nach außen abgebogenen Kontaktzonen und einem resultierenden Biegemoment null,

Fig. 5

eine Draufsicht gemäß Fig. 4 mit einem resultierenden Biegemoment ungleich null,

Fig. 6

eine Draufsicht auf die Kontaktschenkel mit mit nach außen parallelverschobenen Kontaktzonen und einem Biegemoment null,

Fig.7

eine Draufsicht gemäß Fig.6 mit einem resultierenden Biegemoment ungleich null,

Fig.8

eine Draufsicht auf die Kontaktschenkel mit Freischnitten der Kontaktzonen und einem resultierenden Biegemoment null, und

Fig.9

eine Draufsicht gemäß Fig.8 mit einem resultierenden Biegemoment ungleich null.

This object is achieved by the characterizing features of claim 1 and the independent claims 2 to 4. By angling in opposite directions, bending or parallel displacement to the outside or cutting the contact zones of the contact legs in the area of the contact slot in the opposite direction, the distance between the two contact points of the contact zones is reduced. This also reduces the distance between the force components of the contact forces acting perpendicularly on the wire. These two anti-parallel force components result in a resulting bending moment. If the amount of the force components remains the same, but their distance from one another decreases, which is equivalent to a reduction in the effective lever arm, the bending moment also decreases. For this reason, thin wires and strands can now be contacted, in which an excessive bending moment would lead to wire breaks. The embodiments in which the contact zones of the contact legs are bent outward are particularly suitable for contacting strands, since the contact surfaces formed in this way are rounded. Since the geometrical dimensions of the contact legs do not change in the areas in which they are received in the housing, the insulation displacement contact according to the invention can be inserted into the housing without any structural changes. The bending, bending or parallel displacement of the contact zones additionally increases the rigidity of the insulation displacement contact, while the rigidity changes only insignificantly in the embodiment with free cuts. By increasing the stiffness of the insulation displacement contact, cheaper materials can be used without the contact quality changing. The invention is explained in more detail below with the aid of a plurality of exemplary embodiments of inclined insulation displacement contacts made of contact legs with contact zones shown in the drawings. Show it:

Fig. 1

3 shows a section through a housing with an oblique insulation displacement contact according to the prior art,

Fig. 2

2 shows a top view of the contact legs with contact zones angled outwards according to the invention and a resulting bending moment of zero,

Fig. 3

2 with a resulting bending moment not equal to zero,

Fig. 4

a plan view of the contact legs with outwardly bent contact zones and a resulting bending moment zero,

Fig. 5

4 with a resulting bending moment not equal to zero,

Fig. 6

2 shows a plan view of the contact legs with contact zones which are displaced parallel to the outside and a zero bending moment

Fig. 7

6 shows a top view according to FIG. 6 with a resulting bending moment other than zero,

Fig. 8

a plan view of the contact legs with free cuts of the contact zones and a resulting bending moment zero, and

Fig. 9

a plan view of Figure 8 with a resulting bending moment other than zero.

1 shows a section through a according to the State of the art, regularly several Insulation displacement contacts 2 housing 1, of only a insulation displacement contact for the sake of simplicity 2 is shown. This consists of metallic Leaf spring material with two along the contact slot 3 separate, rigid at one end interconnected contact legs 4. To a To achieve an inclined position of the insulation displacement contact 2, are slot-shaped receptacles 5 in the preferred plastic housing 1 offset to each other, arranged diagonally opposite. Depending on how far the recordings 5 are offset from each other are arranged, the insertion angle changes of the wire to be contacted to the contact legs 4 of the insulation displacement contact 2. If the Contact leg 4, as described in DE 41 26 068 is sheared, the enlarges effective width of the contact leg 4, as in Fig. 1 is shown in dashed lines. The width B of the Recording 5 would have to be from the state of the Technology known oblique insulation displacement contact 2 with sheared or twisted contact legs 4 can be widened because the resulting width of the Insulation displacement contact 2 by shear or Twisting in the area of the receptacle 5 is increased in this way is that the contact leg 4 no longer in the Recordings 5 fit.

An embodiment of the invention oblique insulation displacement contact 2 is in Fig.2 shown. The two contact legs 4 are in a common level so that when extended merge into each other via the contact slot 3 would. The contact zones 3 delimiting the contact slot 6 of the contact legs 4 are in opposite directions angled outside, their end faces 7 or their Outside 8 each run parallel to each other. The tops of the contact legs 4 are in one level, i.e. the contact legs have the same Height up. Depending on the angle at which or over what length L the angulation of the contact zones 6 occurs, the contact point 12 shifts, that of the contact edges between the end face 7 and the outside 8 of the contact zones facing the wire 6 is formed. In the embodiment according to 2 there are the two contact points 12 and thus the axis 14 of the inserted wire vertical components of the contact forces F on a common line of action 13 which is perpendicular to the axis 14 of the inserted wire is. That of the two Contact forces F caused the resulting bending moment is therefore zero. In the area of the recordings 5 remains the geometric design of the insulation displacement contact 2 compared to the known ones for which Housing 1 used insulation displacement contacts 2 unchanged, so that the insulation displacement contacts 2 easily inserted into the receptacles 5 of the housing 1 from Fig.1 can be.

In the exemplary embodiment according to FIG. 3, the angle under which the contact zones 6 are angled, smaller than in the exemplary embodiment according to FIG. 2. That's why are the two contact points 12 on one Line of action 13, which is introduced obliquely to the axis 14 of the Wire stands. With that, the two are too perpendicular to the axis 14 of the inserted wire not acting force components F of the contact forces on a common line of action so that a resulting Bending moment not equal to zero, but less than occurs without bending. Depending on the type of to contacting wires can be the angle &, under which the bend is to take place, varies and thus that resulting bending moment can be set.

In Figure 4 is an embodiment of the oblique Insulation displacement contact 2 for contacting represented by strands. Instead of a bend as in previous embodiment, here are the Contact zones 6 of the contact legs 4 in opposite directions bent outwards by a certain bending radius. For contacting strands, it is advantageous if contacting via a rounded outside 9 done so as not to cut the strands. The so formed rounded outside 9 prevents Cut the strands. In this embodiment the bending radius and bending length are just chosen that a resulting bending moment is zero occurs because the contact points 12 of the contact zones 6 lie on the perpendicular to the axis 14 of the Wire standing common line of action 13.

5 is a larger one Bending radius selected so that with the same bending length the two contact points 12 of the contact zones 6 are on a line of action 13, the not perpendicular to the axis 14 of the inserted wire stands, which results in a bending moment. About variation of bending radius and bending length can result Lever arms of the contact forces shifted towards each other will.

An exemplary embodiment is shown in FIG which the contact zones 6 of the contact legs 4 opposite the level of the contact leg 4 in the opposite direction to the depth 10 are parallel shifted outwards, the Contact zones 6 but parallel to the original plane the contact leg 4 are arranged. The parallel shift runs in opposite directions, i.e. one contact zone 6 lies on one side and the other contact zone 6 on the other side of the contact leg level 4. In this embodiment lies the common line of action 13 of the contact points 12 of the contact slot 3 enclosing Contact zones 6 again perpendicular to the axis 14 of the inserted Wire, so that a resulting bending moment zero occurs. About the depth 10 of the parallel shift from the level of the contact leg 4 can the resulting lever arms shifted towards each other will.

7 is a similar embodiment as shown in Figure 6, in which the depth 10 selected is that a resulting bending moment remains because the line of action 13 of the contact points 12 obliquely stands for axis 14 of the inserted wire.

Instead of the bend or turn, there can be a shift the lever arms also through free cuts 11 be performed.

8 shows an embodiment with a trapezoidal shape Cutouts 11 shown. The free cuts 11 are on the sides of the contact legs 4, which face the axis 14 of the wire. This forms contact zones 16, the width of which is less than the material thickness of the contact legs 4, in contrast to the embodiments according to the Fig.2-7, in which the width of the contact zones 6 is equal to the material thickness of the contact leg 4. The two contact points 12 are in the direction the central axis 15 of the contact leg 4 shifted. The trapezoid angle β and the length L of the free cut 11 are chosen in the embodiment so that the Line of action 13 of the contact points 12 perpendicular stands on the axis 14 of the wire to be inserted, so that no resulting bending moment occurs.

In the exemplary embodiment according to FIG. 9, a small one Trapezoidal angle β and the length L of the cut 11 so chosen so that a resulting bending moment due to of the force components F remains. Because the reduction the width of the contact leg 4 only in the area the contact zones 16 of the contact slot 3 takes place, are the changes in the stiffness of the Insulation displacement contact 2 insignificant.

Instead of free cuts, the contact geometry the contact leg 4 from Figures 8 and 9 also through plastic deformation such as Presses manufactured will.

Claims (3)

1. Slanting insulation-piercing terminal contact having two contacting points (12) for electrical conductors, in particular for communications and data technology, made of metallic leaf spring material and having two contact arms (4) separated along the contact slit (3) and connected rigidly to each other at their one end, characterized in that the contact zones (6) of the contact arms (4) are bent away or angled away outwards in opposite directions in the region of the contact slit (3) or are displaced outwards in parallel in opposite directions or are provided with cutouts (11), so that the distance between the two contacting points (12) of the contact zones (6) is reduced, the cutouts (11) representing recesses which lead to a thinning of the thickness of the contact arms (4) in the region of the contact zones (6).
2. Slanting insulation-piercing terminal contact according to Claim 1, characterized in that the depth (10) of the parallel offset of the contact zones (6) corresponds to approximately half the thickness of the contact arms (4).
3. Slanting insulation-piercing terminal contact according to Claim 2, characterized in that the depth (11) of the cutout (11) of the contact zones (16) corresponds to approximately half the thickness of the contact arms (4).

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