JPS5855574Y2 - Connecting terminal part of contact in flat cable connector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connection terminal for a contact of a flat cable connector, and particularly to facilitation of its manufacture.

Conventionally, a connector for flat cables as shown in the sectional front view shown in FIG. 1 has been widely used.

This connector has contacts, that is, a so-called pressure-welding type connecting terminal part C, which has acute angle parts a and a' for cutting the coating on both sides, and a core wire press-fitting groove in the center, and a contact part d connected thereto. Press-fit the core wire into the groove with the cable core f.
It consists of an insulating block g arranged and fixed in the required number of poles so as to match the adjacent pitch of the insulating block g, and a cable pressing plate locked to this insulating block g.

To connect the cable, press the cable i against the insulating block using a pressing plate, insert the acute angle parts a and a' into the left and right sheathing j of the core wire f, and then remove the sheathing by continuing pressing. The core wire f exposed by the tearing is press-fitted into a core wire press-fitting groove whose width is narrower than the diameter of the core wire to make the connection.

Nowadays, the demand for downsizing of devices requires a reduction in the pitch between adjacent core wires in a flat cable, and along with this, a reduction in the pitch between adjacent connection terminal portions of a connector is also required.

However, since the width of the connection terminal part as described above is wide, even if the contacts are arranged in a staggered manner as shown in Figure 2, for example, it will not be possible to meet the demand for miniaturization. I can't.

Therefore, recently, contacts equipped with connection terminal portions C as shown in the front view, top view, and side view shown in Fig. 3 a, l), and c are arranged in an insulating block g as shown in the plan view of Fig. 4. A fixed one is proposed.

This is a corner part for cutting the coating with guiding slopes ', l', first and second tongue pieces m, n having tips l, and a corner part O for cutting the coating with a guiding slope O. ′ is on the above guide slope.

It is composed of first and second tongue pieces mn which form a trough with l' and are arranged in the center so as to be different from each other, and an intermediate tongue piece p having a common base.The cable can be connected in the following manner. conduct.

That is, as shown by the dotted lines in Fig. 3b and Fig. 4, the cable i is placed on the connection terminal part and pressed by a pressing plate (not shown), so that l is first applied to the corner part for cutting the coating.
, O into the coating j on both sides of the core wire.

Next, by further pressing, the coating on both the left and right sides of the core wire g is cut, and the gap is selected so that the core wire f is smaller in diameter than the first and second tongue pieces m, as shown in FIG. , n are press-fitted between the intermediate tongue pieces 9 located at different positions, thereby exposing the core wires at the edges m', n' and p', p'' for connection.

According to this method, the width of the connecting terminal part is 11 (see Fig. 3).
can be approximately twice the plate thickness.

Therefore, compared to the conventional structure shown in FIG. 1, the adjacent pitch between the connecting terminal portions can be made much smaller, and it is possible to sufficiently cope with a reduction in the adjacent pitch between the core wires in flat cables.

On the other hand, in this connection terminal part, as can be clearly seen from Fig. 3, the guide slopes of the first and second tongues have ', l', which is completely opposite to the direction of inclination of the guide slope 0' of the intermediate tongue. Therefore, the pressing direction during punching press is completely opposite.

Therefore, it is inevitable that the connector will be difficult to manufacture and the manufacturing cost will be high, making the connector expensive.

The purpose of the present invention is to provide a connecting terminal portion that solves the above-mentioned manufacturing difficulties, and the details thereof will be explained next with reference to the drawings.

FIGS. 6 a, 1) and c are developed front views, a top view and a side view of the contact of the present invention, and FIGS. 7 a, 1) and c are a completed front view, a top view and a side view of the contact of the present invention.

In the present invention, first, as shown in FIG. 6, an intermediate tongue piece 2 having a corner part 1 for cutting the coating provided with a guide slope 1' at the tip;
Guide slopes 3' inclined in the same direction as the guide slopes 1' of the intermediate tongue are disposed on the same plane on both sides of the intermediate tongue and spaced apart from each other in terms of the bias.

A plate consisting of first and second outer tongues 5, 6 for first and second tongue-shaped restraints having angles 3, 4 for cutting the cover and having a tip 4' is punched out.

However, as shown in FIG. 7, the first and second outer tongue pieces 6,
6, the guide slopes 3' and 4' form a valley with the guide slope 1' of the intermediate tongue piece 2, and at the same time, the press-fitting interval of the core wire of the required diameter is obtained, and moreover, it does not overlap with the intermediate tongue piece 2. Fold each intermediate tongue piece 2 side as shown in Fig. 3.
, second tongue pieces m and n.

The first and second outer tongues, which have formed the guide slope in the same direction as the guide slope of the intermediate tongue, are bent to form the first and second tongues m and n shown in FIG. If you do this,
Since the pressing direction during the punching press is unidirectional, manufacturing is facilitated and costs can be reduced.

Further, in this case, the width of the connecting terminal portion is almost the same as that of the conventional one shown in FIG. 3, so that it is possible to sufficiently respond to the reduction in the adjacent pitch of the core wires in the flat cable.

Therefore, a flat cable connector with a small pitch between adjacent core wires can be provided at low cost.

In the present invention, the press-fitting interval of the core wires is determined by adjusting the curvature of the bending of the first and second outer tongue pieces 5, 6 as shown in the plan view shown in FIGS. 8a and 8l).

Also, first and second outer tongue pieces 5.6 for forming the first and second tongue pieces.
By reversing the direction of bending from that shown in FIG. 7, the first and second tongues can be constructed with even stronger spring force.

FIG. 9 shows an example of this, in which the first and second outer tongue pieces 5 and 6 are punched out as shown in the plan view shown in FIG. As shown in the plan view and side view shown in FIGS.

Next, as shown in the side view shown in FIG. 9d, bend the first and second outer tongue pieces 5 and 6 so that their slopes 3' and 4' form a valley with the slope 1' of the intermediate tongue piece 2. The connecting terminal portion has a strong spring force that allows for a good connection.

As is clear from the above description, according to the present invention, it is possible to easily manufacture the connection terminal portion of the contact in a connector for a flat cable in which the adjacent pitch of the core wires is small, and the practical effect is great.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional front view of a conventional flat cable connector, Fig. 2 is a plan view illustrating the arrangement method of the connecting terminals, Figs. 3 a, l), c, and 4 are the connecting terminals. A front view, a plan view, and a side view showing other examples, a plan view explaining the arrangement method, Fig. 5 is a connection diagram, Fig. 6 a, l), c
Figure 7a shows the developed front view, plan view and side view of the project.
, b, and c are the completed front view, plan view, and side view of the contact of the present invention, and FIG. 8a. b is a plan view showing the method of adjusting the core wire press-fitting interval, Figures 9a and l
), c, and d are plan and side views showing modified examples of the present invention. 1... Corner for cutting the coating, 1'... Guide slope, 2... Intermediate tongue piece, 3, 4... Corner for cutting the coating Part, 3', 4'... Guide slope, 5,
6...First and second outer tongue pieces for the first and second tongue piece shapes, 7...Contact portion.

Claims (1)

[Scope of utility model registration request] An intermediate tongue piece having a chevron-shaped coating cut portion with a guide slope at the tip, and first and second outer tongue pieces each having a chevron-shaped cover cut portion with a guide slope in the same direction as the guide slope are spaced apart by a width or more. The connection terminal forming plates disposed on both sides of the intermediate tongue are punched out, and the first and second outer tongues are formed so that the respective guide slopes form the guide slopes and troughs of the intermediate tongue and the intermediate tongue at the same time. The connection terminal part of the contact in a flat cable connector with the middle tongue bent to one side to avoid overlapping.