CZ288342B6 - Contact element for making contact of electrical conductor - Google Patents

Abstract

The invented contact element for making contact of an electrical conductor covered with an insulating jacket by cutting through insulation and clamping has a contact body (1) with a cutting and clamping part and with a spring (9) encompassing the contact body (1). The spring (9) is arranged movably with respect to the contact body (1) between a cutting position, in which is forms a rigid support of the contact body (1) edge (5) when gutting through the insulating jacket (4), and a clamping position, in which the spring (9) is at a certain distance from the contact body (1) edge (5).

Description

Contact element for making an electrical conductor contact

Technical field

The invention relates to a contact element for contacting an electrical conductor coated with an insulating sheath by cutting the insulation and clamping, with the contact body with the cutting and clamping piece and with the spring surrounding the contact body.

BACKGROUND OF THE INVENTION

A similar contact element is already known (DE 41 08 133 C2). With this contact element, the contact body and the spring are designed as one component, making it difficult to select materials and adapt to different requirements.

In fact, by measuring and designing the contact element, the insulated conductor is to be fastened and contacted without first having to remove the insulating sheath and without requiring soldering. The contact body thus has two functions: Firstly, the insulating sheath should be cut when the conductor is pressed in without damaging the metal conductor. This is particularly important for conductors with cable cores, where the possibility of cutting individual conductor cores must be avoided. Second, the conductor should be firmly clamped when pushed in to ensure good contact between the conductor and the contact body. The clamping must be firm enough to secure the conductor against loosening or falling out.

In order to guarantee these different functions, different kinds of clamping contact elements have already been proposed. This is the case, for example, with CH 266 481 A1. There is a bevelled edge in front of the clamping area of the contact element itself. In this known contact element, however, the actual forming region is not provided before the clamping region.

DE 35 06 797 C1 discloses a method for folding wires into a bonding field, in which the cutting clamps adjoining the lead-in area have a clamping area as well as a cutting-clamping area adjoining the clamping area. The transition from the clamping area to the narrower cutting-clamping area is here formed as a rectangular step, so that a conductor that is wider than the cutting-clamping area or if the conductor is not pushed into the middle of the area runs the risk of damaging the conductor. However, if the conductor is already thinner beforehand, safe contact is not guaranteed. As a safeguard against the conductor falling out of the cutting-clamping area, a cover lid is additionally provided here which keeps the wires folded into the clamping area pressed in the corresponding cutting-clamping areas.

DE 89 14 739 U1 also discloses a contact formed by cutting and clamping with a stepped notch. Here, the insulated conductor is first pressed into the region of the bow-shaped inner surfaces, which are approaching each other convexly, thereby opening the contact fingers forming the contact notch, respectively the conductor is deformed. Upon further pressing, a double-sided blade penetrates the conductor and permeates the insulation. Then the conductor enters the inner area with lateral contact surfaces. Contact fingers are elastic in the area of cutting and contact surfaces. In particular, it is thereby possible to accommodate wires of different diameters or to accommodate a plurality of wires of approximately the same diameters in a contact cut. In order to achieve the required elasticity, the contact fingers are provided with a recess. This particular shape may be suitable for this purpose, but for conventional use with fixed wire cross sections such a shape is too expensive.

The use of springs is also known thanks to DE 38 26 670 A1. These springs are used to strengthen the contact force and are fixed. They are relatively weak and cannot be switched on or off, so they cannot be used in a targeted way.

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SUMMARY OF THE INVENTION It is an object of the invention to overcome this disadvantage and to provide a contact element whose spring is relatively strong and whose effect can be purposefully applied and adjusted.

SUMMARY OF THE INVENTION

Said object fulfills a contact element for making contact of an electrical conductor coated with an insulating sheath by cutting the insulation and clamping, with a contact body with a cutting and clamping element and with a spring surrounding the contact body according to the invention. a position in which the rigid abutment forms the blade of the contact body when cutting the insulating sheath, and a clamping position in which there is a distance between the spring and the blade of the contact body.

According to a preferred embodiment, a contact surface adjacent to the cutting edge 15 is provided on the contact body, at which a contact point is provided for making contact by cutting the insulation and clamping, at which contact distance exists between the spring and the blade of the contact body.

The contact body is preferably inserted into the plug body, with the spring abutting the inner wall of the body.

The spring is preferably designed as a steel spring.

The spring is preferably provided with protrusions for relieving the electrical conductor in tension.

BRIEF DESCRIPTION OF THE DRAWINGS

1 shows a longitudinal section of a contact element in a cutting position, FIG. 2 shows a longitudinal section of a contact element also in a cutting position, FIG. 3 shows a longitudinal section of a contact element; Fig. 4 is a cross-sectional view of the contact element in the clamping position; Fig. 5 is an enlarged detail of the contact element.

DETAILED DESCRIPTION OF THE INVENTION

The contact element has a contact body 1 which is intended to receive an electrical conductor 2. The electrical conductor 2 has Cu cores 3 which are coated with an insulating sheath 4. When the conductor 2 is pushed into the contact body 1, this insulating sheath 4 is cut by two opposites The beginning of cutting of the insulating sheath 4 is shown in FIGS. 1 and 2.

The two cutting edges 6 of the blade 5, shown in FIG. 5, penetrate the insulating sheath 4, grasp the Cu cores 3 and pull the conductor 2 into the contact point 8 at which the Cu cores 3 change their positions relative to each other and are pushed into a contact surface 7 disposed adjacent the cutting edge 6 as is

Thus, the contacting is moved from the cutting edges 6 to the contact surfaces 7 and the notches on the wire 2 resulting from the cutting process are mechanically relieved.

The contact body 1 is surrounded by a spring 9 having two cranked portions 10, which in the cutting position according to FIG. The spring 9 is preferably made of steel and is relatively rigid. Upon transition from the cutting position to the clamping position, that is to say when the conductor 2 is pressed deeper into the contact body 1, the conductor 2 carries the spring 9 with it and generates a stroke. At the end of this movement, the spring 9 strikes the contact body 1, each with a curved part 11, and the cranked parts 10 lose their contact with the blade 5 (FIG. 4).

It can be seen from FIG. 3 that the spring 9 is provided with curved projections 12 which, in the clamping position, engage the insulating sheath 4 and thereby serve to relieve the tension. It is not shown in greater detail that the cutting surfaces 6 push the insulating sheath 4 apart in the gap 13 resulting from its cutting.

The contact body 1 and the spring 9 are inserted into the plug body 14 and in the cutting position (FIG. 2) the spring 9 rests against the inner wall 15 of the body 14.

It will be appreciated that in the cutting position, i.e. when the insulating sheath 4 is separated from the conductor 2, a very rigid spring (spring 9) starts to act, which does not bend at all or only minimally. However, in the clamping position, the additional force of the spring 9 is canceled. The spring force of the contact body 1, which has a more favorable characteristic of elasticity, is then applied.

In order to secure and check the correct position of the conductor 2 at the contact point 8, a plastic cover 16 is fitted on the body 14. Repair of the connection is always possible. The particular mobility of the spring 9 relative to the contact body 1 has the advantage, inter alia, that tolerances can be easily compensated.

Claims (5)

A contact element for contacting an electrical conductor coated with an insulating sheath 5 by cutting the insulation and clamping, with the contact body (1) with the cutting and clamping part and with the spring (4) surrounding the contact body, characterized in that the spring (9) is arranged movably relative to the contact body (1) between cutting position form a rigid abutment of the blade (5) of the contact body (1) when cutting the insulating sheath (4), and a clamping position in which there is a distance between the spring (9) and the blade (5) of the contact body (1). Contact element according to claim 1, characterized in that a contact surface (7) is arranged on the contact body (1) next to the cutting edge (6), on which a contact point (8) is provided for making contact by cutting the insulation and clamping and at this contact point (8) there is a distance between the spring (9) and the blade (5) of the contact body (1). Contact element according to one of claims 1 or 2, characterized in that the contact body (1) is inserted into the plug body (14), the spring (9) abutting on the inner wall (15) of the body (14). 20 May Contact element according to one of Claims 1 to 3, characterized in that the spring (9) is designed as a steel spring. Contact element according to one of Claims 1 to 4, characterized in that the spring (9) is provided with projections (12) for relieving the electrical conductor (2) in tension.