Electrical crimp contact

Abstract

A contact sleeve for connecting at least one stranded wire has a receiving region extending longitudinally to a central line. The central line runs parallel to the stranded wire for inserting stripped ends of the at least one stranded wire and has two crimp wings that are each directed towards each other. In the folded state, the two crimp wings clamp the stripped ends. The crimp wings have grooves that run on both crimp wings relative to the central line in the shape of an arrow. The grooves run outwards, in each case starting from the central line and being curved with a continuously decreasing gradient.

Claims

1. A contact sleeve for connecting at least one stranded wire having a receiving region extending longitudinally to a central line (14) running in parallel to the stranded wire for inserting stripped ends of the at least one stranded wire and having two crimp wings (15a, 15b) that are each directed towards each other and, in the folded state, clamp the stripped ends, wherein the crimp wings (15a, 15b) have grooves (13) that run on both crimp wings relative to the central line in the shape of an arrow, wherein the grooves (13) run outwards in a direction of an edge of the crimp wings, in each case starting from the central line and being curved with a continuously decreasing gradient.

2. The contact sleeve according to claim 1, wherein the grooves (13) start on the central line (14) and extend across the crimp wings (15a, 15b) up to a predetermined distance from the end of the crimp wings (15a, 15a).

3. The contact sleeve according to claim 2, wherein the gradient of a tangent to the grooves (13) on the central line (14) has an angle (.sub.S) of about 832 with a line vertical relative to the central line and decreases up to an angle (.sub.E) of 881 with a line perpendicular to the central line on the end of the grooves (13).

4. The contact sleeve according to claim 1, wherein the grooves (13) run symmetrically relative to the central line (14).

5. The contact sleeve according to claim 1, wherein the grooves (13) are groove-like indentations that are arranged on the side of the receiving region and the crimp wings (15a, 15b) facing towards the stranded wire.

Description

SHORT DESCRIPTION OF THE DRAWINGS

(1) Exemplary embodiments of the invention are depicted in the figures and are explained in more detail in the description below.

(2) FIG. 1 shows a contact sleeve having crimp wings according to prior art.

(3) FIG. 2 shows a plan view of a contact crimping region according to the invention.

EMBODIMENTS OF THE INVENTION

(4) A contact sleeve depicted in FIG. 1 has a contact crimping region 10 that serves to press strands 10b together with the crimping wings 10a, and an insulating crimping region 11 for fixing the contact crimping region 10 on an insulator of a stranded wire 12. The contact crimping region 10 has a receiving surface 12a. It serves, together with the crimping wings 10a, to press the strands 10b together, in an inherently known manner. The insulating crimping region 11 that surrounds an insulator of the stranded wire 12 is arranged attaching the contact crimping region 10. The insulating crimping region 11 surrounds and clamps the stranded wire 12 and thus serves to fix the stranded wire 12 and the strain relief thereof.

(5) A plan view depicted in FIG. 2 on a contact crimping region 15 that has two crimp wings 15a, 15b comprises grooves 13 arranged to be symmetrical relative to a central line 14, said grooves 13 running curved in a wing-shaped manner in the same way as bird wings. The curvature is thus formed in such a way that a tangent to the grooves forms an angle as with the central line 14 in the region of the central line 14. The gradient decreases constantly to the external edge of the crimp wing 15a, 15b, such that the gradient of the grooves forms an angle .sub.E relative to the central line 14 in the external region.

(6) Research by the applicant has shown that the angle as is preferably about 832, whereas the angle .sub.E is about 881.

(7) Because of this shape of the grooves that runs curved and has a curvature that continuously decreases from the central line 14 outwards in the direction of the edge of the crimp wings 15a, 15b, an optimal pressing of the strands together in the crimp wings 15a, 15b is achieved. Thus, the arrangement of the grooves that runs curved takes into account the fact that, during crimping, the crimp wings 15a, 15b only travel a short way in the region of the central line 14, whereas they travel a great way in the external region of the crimp wings 15a, 15b. This smaller way in the region of the central line 14 is taken into account by the greater gradient of the grooves, whereas the greater way travelled during crimping in the external region of the crimp wings 15a, 15b is taken into account by the smaller gradient. The crimping by means of these curved grooves enables an optimal contacting of the strands, in particular a gas-tight contacting of stranded wires, which cannot be achieved by grooves running linearly.

(8) The grooves running curved are preferably formed symmetrically relative to the central line 14. It can, however, also be provided in an alternative embodiment to form the grooves unsymmetrically, i.e. to provide grooves on one crimp wing that have a different gradient to those on the other crimp wing. The grooves are indentations, corrugations or similar, for example, that project in the direction of the strands and thus press the strands together.

(9) The grooves preferably start on the central line 14 and extend across the crimp wings 15a, 15b up to a predetermined distance from the end of the crimp wings or even up to the end of the crimp wings itself.