JPS62232873A - Cut terminal for jointing insulated wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cutting terminal for connecting insulated electric wires.

Such a cutting terminal is known from the prior art, for example from US Patent Application No. 1263130,
A cutting terminal made of flat material has a scissor slit in the middle into which the metal core of an insulated wire can be pushed for connection purposes. The end faces of the scissor jaws, which are the side legs that limit this scissor slit, form an acute cut with respect to the inner wall of the scissor jaws, which facilitates cutting into the insulation sheath. In this case, the end face extends outwards in an arcuately concave manner and merges into the flared section of the scissor jaws. The scissor slit itself is connected to the cutting edge and flares out in an arc, resulting in an extremely sharp cut.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cutting terminal that can reliably and inexpensively connect electric wires having an extremely hard and viscous insulating sheath.

Means for Solving the Problem In order to solve this problem, the present invention provides a cutting terminal for connecting an insulated electric wire, wherein the electric wire is inserted into a scissors slit of the cutting terminal formed from a flat material. It can be pushed in laterally, in which case a scissor slit is configured between two scissor jaws, between which the core of the insulated wire is sandwiched to create contact. and both scissor jaws have dowel cutting edges at the free ends of the scissor slits for cutting into the insulating sheath, in which case the spacing between the two cutting edges is approximately equal to the core diameter of the wire, and the scissor jaws have In those types in which the end face extending obliquely in the area of the cutting edge forms an acute cutting part together with the inside of the scissor jaw, the tip of the scissor jaw is wedge-shaped and flat, and the end face is It extends continuously and obliquely to the outside of the scissor jaws, and the inside of the scissor jaws connects to the cutting part and extends parallel to each other.

ADVANTAGES OF THE INVENTION The cutting terminal according to the invention has a simple geometry that can be produced advantageously in terms of punching technology.

The insulating sheath is not scraped off but pierced when the wire is pushed in, and is pushed outwards without being torn apart in the connection area by the flat flanks. This causes the insulating sheath to act on the cutting terminal from around it, thereby increasing the force of the scissors. Penetrating the insulation sheath damages the insulation sheath less than scraping it. This is because the cutting area is smaller when piercing, and the oblique end face creates an outward force component that reduces the load on the cutting edge. Alternatively, the inner sides of the scissor jaws run parallel to each other, which provides better support for the cutting edge and thus improves its holding capacity. A cutting terminal constructed in this way is particularly suitable for wires with a thick insulating sheath that is extremely difficult to cut (for example, the insulating sheath of an external connection line of a telephone).

Embodiment If configured as described in claim 2,
The load on the cutting edge is further reduced. This is because in this case the metal core slides along the cutting edge. As a result, the sharpness of the cutting edge is maintained even during successive connecting operations.

The wider lead-in section also allows the wire to be better centered, thereby reducing the risk of damage to the core. Additionally, additional cutting edges in the stepped constriction remove the remaining insulating jacket layer from the core to achieve a secure connection.

Example The invention will now be described in detail with reference to the drawings.

As can be seen from FIGS. 1, 2 and 3, the cutting terminal 1 is manufactured from a flat material. The cutting terminal 1 has a scissor slit 2 formed between the scissor jaws 3 in the middle. The scissor jaws 3 have on their free end faces a bevel which extends at an acute angle to the inside of the scissor jaws 3 and forms with it a sharp cutting edge 5. The inclined portion 4 extends continuously and flatly to the outside of the scissors 3. The inner sides of the scissor jaws 3 extend parallel to each other.

When the insulated electric wire 6 is pushed in, the insulating sheath of the electric wire 6 is pierced by the cutting blade 5 and is pushed outward by the inclined portion extending at an angle smaller than 450 mm. This insulating jacket section surrounds both scissor jaws 3 on the outside.

The metal core of the wire 6 is inserted into the scissor slit 2 between the two scissor jaws 3 and electrically connected to the two scissor jaws 3.

The scissor slit 2 is somewhat wider than the core diameter of the wire 6 at its outer end. This introduction region ends in a sharp-edged stepped constriction 7 to which the actual scissor section 8 adjoins. This scissor area 8
The inner width of the wire 6 is somewhat smaller than the core diameter of the wire 6, so that the wire 6 is connected sufficiently strongly.

[Brief explanation of drawings]

Figure 1 is a side view showing the electric wire and cutting terminal before connection, Figure 2 is a side view showing the state after they are connected, and Figure 3 shows the same state as shown in Figure 2. FIG. 1... Cutting terminal, 2... Scissor slit,
3... Scissor jaws, 4... Inclined portion, 5... Cutting blade, 6... Electric wire, 7... Constricted portion, 8... Scissor area.

Claims (1)

[Claims] 1. A cutting terminal for connecting an insulated electric wire, wherein the electric wire can be pushed laterally into a scissor slit of the cutting terminal formed from a flat material,
In this case, the scissor slit is configured between two scissor jaws, between which the core of the insulated wire is sandwiched to create contact, and the scissor jaws are arranged between the two scissor jaws. The free end of the slit has a cutting edge for cutting into the insulating sheath, and in this case, the distance between the two cutting edges is approximately equal to the core diameter of the wire.
In the type of scissor jaw in which the obliquely extending end face in the area of the cutting edge forms an acute cutting part together with the inside of the scissor jaw, the tip of the scissor jaw is configured flat in the shape of a wedge. for connecting insulated wires, characterized in that the end face extends continuously and obliquely to the outside of the scissor jaws, and the inside of the scissor jaws connects to the cutting part and extends parallel to each other cutting terminal. 2. The inner width between the two tips of the scissor jaws is somewhat larger than the core diameter of the wire, and the scissor slit has a sharp stepped narrowed edge, and the narrowed portion is for the tip and the wire. 2. A cutting terminal according to claim 1, wherein the scissor slit is located between the scissors section and the inner width of the scissors slit below the constriction is somewhat smaller than the core diameter of the wire.