JPH08329995A - Pressure-contact terminal - Google Patents

Abstract

PURPOSE: To prevent fall off of an insulated wire, which is pressed-in for insertion. CONSTITUTION: A longitudinal slit 22 of which upper end is opened is formed between a pair of pressure-contact blades 21, and an insulated wire 16 is pressed- into this slit 22. A fall-off preventing projection 23 is projected form each pressure-contact blade 21 near the opening end of the upper part so as to narrow the opening width of the slit 22, and the lower part thereof is formed narrower, as the opening width of the slit 22 comes lower. A triangle turning projection 24, which is projected inside the slit 22, is projected from each pressure-contact blade 21 near the lower end of the slit 22, and the opposed dimension S3 of the tip of the projection 24 is formed a little narrower than the outer diameter dimension (d) of a core 16b of the insulated wire 16. Each pressure-contact blade 21 is struck at the time of pressing so that the thickness thereof is reduced as it comes close to the tip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a pressure contact terminal for contacting a core wire with a pressure contact blade by press fitting an insulated wire into a slit.

[0002]

2. Description of the Related Art The conventional structure of this type of terminal is as shown in FIG. Here, 1 is a slit having an open upper end, and press-contact blades 2 are provided facing the opening edges on both sides thereof. When the insulated electric wire 3 is press-fitted into the slit 1 from the upper open end, the press contact blade 2 bites into the insulating coating 3a of the insulated electric wire 3 and comes into contact with the core wire 3b as shown in FIG.

[0003]

However, in the pressure contact terminal having the above-mentioned structure, there is a problem that when a strong force pulling the press-fitted insulated wire 3 acts, the wire 3 comes out relatively easily. .

The present invention has been made to solve the above problems, and an object of the present invention is to provide a press-contact terminal capable of preventing an insulated wire once press-fitted from coming off easily.

[0005]

According to the pressure contact terminal of the present invention, an insulated wire is press-fitted into the slit whose one end is open from the open end side so that the pressure contact blade at the slit opening edge bites into the insulation coating of the insulated wire. In this case, the press contact blade is characterized in that a return protrusion for preventing the insulated wire from returning to the open end side is formed (the invention of claim 1).

Further, in the above-mentioned structure, the pair of press contact blades facing each other through the slit may be set so that the thickness is reduced toward the open end side of the slit (the invention of claim 2).
Furthermore, a retaining protrusion may be provided near the open end of the slit of the press contact blade so as to narrow the open width of the slit (the invention of claim 3).

[0007]

When the insulated electric wire is press-fitted from the open end side of the slit, the press-contact blade bites into the insulating coating and comes into contact with the core wire, thereby establishing an electrical connection. In this pressure contact state, when a force is applied to the insulated wire toward the slit open end side, the insulated wire is caught by the return protrusion formed on the pressure contact blade to prevent the insulated wire from coming off. Further, in addition to the above configuration, in the invention of claim 2 in which the tip of the press contact blade is thinned, the tip of the press contact blade is easily bent and deformed when the insulated wire is pressed into the slit. Further, according to the invention of claim 3 in which a retaining protrusion is formed near the open end of the slit, when the insulated wire is lightly inserted into the slit, the insulated wire is detached when a force in the detachment direction acts on the insulated wire. It is caught by the stop projection and is prevented from coming off.

[0008]

As described above, according to the invention of claim 1, it is possible to surely prevent the press-fitted insulated wire from coming off, and according to the invention of claim 2, further, This has the effect of simplifying the press-fitting work. Further, according to the invention of claim 3, the excellent effect that the insulated wire temporarily inserted in the slit can be prevented from being pulled out and the press-fitting work is facilitated can be obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to FIGS.

FIG. 1 shows a branch box to which the present invention is applied. This is configured by covering the board 11 with the upper case 12, and 6 modular outlets 1 are provided on the board 11.
3 are arranged in a row, and the pressure contact terminal block 14 is fixed adjacent to these modular outlets 13. This pressure contact terminal block 14 has one modular outlet 1
Eight pressure contact terminals 20 are provided for 3, and a total of 48 pressure contact terminals 20 are erected in two rows. The insulated wires 16 of the cable 15 are connected to these press-contact terminals 20. Although not shown, the press contact terminals 20 and the contacts of the modular outlet 13 are connected by a printed wiring means.

Now, the structure of each press contact terminal 20 will be described in detail. This is manufactured by pressing a metal plate, as shown in FIG.
As shown in, a vertically elongated slit 22 having an open upper end is formed between the pair of press contact blades 21, and the insulated wire 16 is press-fitted therein. Near the upper open end of the slit 22, a retaining protrusion 23 is provided on the press contact blade 21 so as to narrow the opening width of the slit 22, and the opening width of the slit 22 is narrowed downward as it goes downward. It is said that. In addition, the slit 2 is provided just below the retaining projection 23.
2 is the maximum opening width, the opening width S
1 is slightly larger than the outer diameter dimension D of the insulated wire 16, and the facing dimension S2 between the retaining projections 23 is smaller than the outer diameter dimension D of the insulated wire. Further, an arc-shaped guide portion 23a is formed on the upper portion of the retaining projection 23 so that the insulated wire 16 can be smoothly inserted into the slit 22.

Near the lower end of the slit 22 of the press contact blade 21, a return protrusion 24 protruding in a triangular shape is provided inside the slit 22, and the tip end thereof has a facing dimension S3.
Is slightly smaller than the outer diameter dimension d of the core wire 16b of the insulated wire 16. In addition, each of the press contact blades 21 is
As shown in FIG. 5, the upper part is tapped so that the upper part becomes thinner.

In order to connect the insulated wire 16 to the press contact terminal 20 in this embodiment, first, the insulated wire 16 is inserted from the upper open end of the slit 22. Then, the outer surface of the insulating coating 16a of the insulated wire 16 is guided by the guide portion 2 of the retaining projection 23.
While being in contact with 3a and sliding there, it is guided into the slit 22. At this time, since the outer diameter dimension D of the insulated wire 16 is thicker than the facing dimension S2 between the retaining protrusions 23, the upper end portion of the pressure contact blade 21 is inserted so as to be expanded. Since the is thin, it is easily bent and deformed, and is easily inserted below the retaining projection 23 (see FIG. 3). In this inserted state, since the opening width S1 of the slit 22 is made slightly larger than the outer diameter dimension D of the insulated wire 16, the insulated wire 16 can be freely moved in the extension direction to adjust the pressure contact position. However, the insulated wire 16 is prevented from coming out of the slit 22 by the presence of the retaining projection 23.

Thereafter, when the insulated wire 16 is pushed inward (downward) of the slit 22, the opening width of the slit 22 is gradually narrowed, so that the edge of the press contact blade 21 is moved toward the insulated wire 16 as it is pushed. It digs into the insulating coating 16a, and finally reaches the core wire 16b and comes into contact therewith to be electrically connected. In this process, the core wire 16b has an outer diameter dimension d.
Is thicker than the spacing dimension S3 between the return protrusions 24, the core wire 16b is slightly deformed and forcibly passes between the return protrusions 24 to reach the bottom of the slit 22 (see FIG. 4). Therefore, even if an upward pulling force acts on the insulated wire 16 in this state, the core wire 16b is caught by the return projection 24, and the insulated wire 16 is reliably prevented from coming out of the slit 22. it can.

As described above, according to this embodiment, the press contact blade 21
The insulated electric wire 16 is formed into the slit 2 by the return protrusion 24 provided on the
It is possible to reliably prevent getting out of 2. Moreover, in this embodiment, since the upper part of the press contact blade 21 is formed thinner than the other parts, the press contact blade 2 is press-fitted into the slit 22 of the insulated wire 16.
The tip of No. 1 is flexibly deformed and is easily inserted into the slit 22. In addition, the stopper protrusion 2 near the open end of the slit 22
3 is formed, even if a force in the detaching direction acts on the insulated electric wire 16 when the insulated electric wire 16 is lightly inserted into the slit 22, the insulated electric wire 16 is prevented from coming off.
It is possible to obtain an effect that it can be reliably prevented from falling off by being caught in 3.

The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the retaining projections 23 may be omitted, and the entire pressure contact blade 21 is formed with a uniform thickness. It may be implemented in various ways without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a perspective view of a branch box showing an embodiment of the present invention.

FIG. 2 is a front view of the pressure contact terminal.

FIG. 3 is a front view of the pressure contact terminal shown with the insulated wire temporarily inserted in the slit.

FIG. 4 is a front view of a press-contact terminal in which an insulated wire is press-fitted into a slit.

FIG. 5 is a side view of the pressure contact terminal.

FIG. 6 is a front view showing a conventional pressure contact terminal.

FIG. 7 is a front view showing a state in which an insulated wire is press-fitted into a conventional pressure contact terminal.

[Explanation of symbols]

 16 ... Insulated wire 16a ... Insulation coating 16b ... Core wire 20 ... Press contact terminal 21 ... Press contact blade 22 ... Slit 23 ... Detachment projection 24 ... Return projection

Claims (3)

[Claims] 1. A method of press-fitting an insulated electric wire from the open end side into a slit having one end opened so that the press contact blade of the slit opening edge bites into the insulating coating of the insulated electric wire to contact the core wire, The pressure contact terminal, wherein the pressure contact blade is formed with a return protrusion that prevents the insulated wire from returning to the open end side. 2. The pressure contact terminal according to claim 1, wherein the pair of pressure contact blades facing each other via the slit are set so that the thickness becomes thinner toward the open end side of the slit. 3. The press-connecting terminal according to claim 2, wherein a stopper protrusion is provided near the open end of the slit in the press-contact blade so as to narrow the opening width of the slit.