JPS5855573Y2 - Connecting terminal part of contact in flat cable connector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connecting terminal portion of a contact in a flat cable connector, and particularly to a connecting terminal portion suitable for connecting a flat cable having a thin core wire.

Conventionally, connectors for flat cables having a configuration as shown in the sectional front view shown in FIG. 1 have been widely used.

This connector consists of a contact, that is, a connecting terminal part C that 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 that is connected to the connecting terminal part C. It consists of an insulating block g in which the required number of poles are arranged and fixed so that the core wire press-fitting grooves match the adjacent pitch of the cable core wires f, and a cable pressing plate that is locked to this insulating block g.

To connect the cable, press the cable i against the insulating block side using a pressing plate, insert the acute angle part a a' into the left and right sheathing j of the core wire f first, and then press the cable i with continued pressure. The core wire f exposed by tearing the coating 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.

By the way, when forming this type of pressure welding type connection terminal by punching, the width of the core wire press-fit groove that can be formed is related to the plate thickness.For example, the plate thickness most commonly used is Q,
In the case of 3 mm, about 0.2 mm is the minimum that can be formed.

Of course, it would be possible to make the plate thickness even smaller, but this is difficult to achieve because it is difficult to obtain sufficient contact pressure.

Therefore, for example, if the diameter of the core wire becomes equal to or smaller than the width of the core wire press-fitting groove that can be realized, the connecting terminal will not be able to press the core wire of the flat cable and will not be able to obtain a connecting effect.

Conventionally, in such a case, as shown in the partial cross-sectional plan view shown in Fig. 2, both sides of the core wire press-fitting groove are crushed as shown by b' over an appropriate length to close the end. The edges are extended toward the center and the width of the core wire press-fit groove is narrowed to meet the demands.

However, since there is a limit to the length that can be extended using this method, the diameter of the core wire of the flat cable to be connected cannot be made infinitely small.

The purpose of this proposal is to provide a connecting terminal portion of a contact that enables reliable connection even when a flat cable has a core wire no matter how thin it is.The details thereof will be explained next with reference to the drawings.

Figures 3a, l) and c are a perspective view, a top view and a side view of an embodiment of the present invention.

In the figure, reference numeral 1 denotes a female contact portion formed of contact pieces 2 and 2', between which a male contact 3 is inserted to establish a connection.

Reference numeral 4 denotes a connection terminal section, which is formed from the following parts.

5 is the first tongue portion having a chevron-shaped cross section, and is located 2 from the longitudinal center.
It is formed by bending it in half.

Reference numeral 6 denotes a corner portion for cutting the coating provided at the tip thereof, and is formed by guide slopes 6', 6'' descending in the left-right direction.

Reference numeral 7 denotes a flat second tongue piece, the longitudinal end surface of which is connected to the first tongue piece.
The left and right ends 5/, 5/ of the first tongue 5 are located at right angles within the included angle of the tongue 5 and coincide with the bending center line thereof.
The opposing position is selected so that when the core wire is pushed between / and the end surface 7' of the second tongue piece 7, the first tongue piece 5 generates a force that presses the core wire toward the second tongue piece 7 side. .

Reference numeral 8 denotes a corner portion for cutting the coating, and a guiding slope 8 descending to the first tongue piece 5 side.
', and the height of the top of the corner 8 and the lower end of the slope 8' is approximately the same as the top of the corner 6 for coating cutting of the first tongue piece 5 and the lower end of the guide slope 6', 6// Made to match the height.

Next, the connection procedure will be described with reference to FIG.

As shown in Fig. 4a, the guide slopes 6' of the first and second tongue pieces 5, 7
, 6'' and 8', and press the cable pressing plate 10 from above.

Then, the coating cutting corner parts 6 and 8 first pierce the coating part 9'' on both the left and right sides of the core wire part 9' as shown in FIG. ' continues tearing the coating.

Then, when the core wire portion 9' passes the lower end corners of the guide slopes 6t, 6tt, and 8', a cut is made in the sheath 9'' to reach the surface of the core wire 9', and the core wire is formed as shown in FIGS. 4c and d. It enters between the vertical edges of the first and second tongue pieces 5 and 7 as shown in FIG.

When the core wire 9' is inserted, the core wire 9' is pushed by both vertical edges 5', 5'' of the first tongue piece 5 and pressed against the end surface 7' of the second tongue piece 7, and eventually makes good contact at three points. connection is made.

As described above, the present invention includes a first tongue having a chevron-shaped cross section, and a second tongue having a flat plate shape and opposing the first tongue at right angles within the included angle thereof.

Therefore, by adjusting the opposing gap between the first and second tongue pieces, the width of the gap in which the core wire is inserted can be freely adjusted to be smaller or larger, and it is limited to that width, like the core wire press-fit groove of the conventional connection terminal part. There is no.

Further, the number of contact points in the conventional method is two, but in the present invention there are three.

Therefore, according to the present invention, it is possible to realize a connector having a press-contact type connecting terminal portion, which can reliably connect a flat cable having a thin core wire, which has been impossible with conventional connecting terminal portions.

Note that in the above, the first tongue piece 5 is folded in two, but the fifth tongue piece 5 is folded in two.
By increasing the number of bent parts as shown in the plan view shown in Figure a, or by forming the first tongue piece 5 in a semicircular mountain shape as shown in the plan view shown in Figure 5, it is possible to The first tongue piece with a strong spring force can be made using this.

Further, in the above embodiments, an example was shown in which the contact portion was a female portion, but it goes without saying that this may be a male portion.

As is clear from the above explanation, according to the present invention, it is possible to provide a connector equipped with a press-fit type connecting terminal part that can reliably connect a flat cable with a thinner core wire diameter than conventional connectors, and has practical effects. is big.

[Brief explanation of drawings]

1 and 2 are a cross-sectional front view of a conventional flat cable connector, a plan view showing a method for narrowing the width of the core wire press-fit groove, and FIG. 3a. b, C are perspective views, plan views, and side views showing one embodiment of the present invention; Fig. 4 a, l), c, and d are explanatory diagrams of flat cable connection procedures; Fig. 5 a, l) are illustrations of the present invention. It is a top view which shows the modification of . 1...Contact part, 2, 2'...Contact piece,
3...Male contact, 4...Connection terminal portion, 5...First tongue piece, 6...Corner part for cutting the coating, 6', 6″...Guide slope, 7...
...Second tongue piece, 8...Corner part for cutting the coating, 8'.
...Guiding slope, 9...Flat cable, 9'...Core wire section, 9''...Coating section.

Claims (1)

[Scope of utility model registration request] A first tongue portion having a chevron-shaped cross section and having a corner portion and an inclined portion for cutting the coating at the tip thereof, and a first tongue portion located substantially perpendicularly opposite to each other within the angle and corresponding to the diameter of the core wire. and a second tongue piece having a coating cutting angle with a slope downward to one side of the first tongue, and a second tongue piece having an angle for cutting the coating, and the first and second tongue pieces cut the core wire of the flat cable. A connecting terminal portion of a contact in a flat cable connector that is designed to connect by inserting it along the formed valley.