JPH0969369A - Open barrel contact assembly and open barrel crimp tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To crimp a multi-core cable wire to an open barrel of a connector for cable, which has a multi-core contact with a pitch narrower than that of the conventional one. SOLUTION: Open barrels 3 projected from a molding resin body 4 are arranged in two lines with an equal pitch, and they are shifted by 1/2 of the pitch from each other. As a crimp tool, the structure that projecting parts and recessed parts are repeated alternately is formed, and a pitch between the adjacent projecting parts and a pitch between the adjacent recessed parts are formed equal to the pitch of the open barrels 3, and height of the projection is formed so as to correspond with the pitch of the two lines, and an anvil part is formed in the tip of the projecting part, and a crimper part is formed in the bottom part of each recessed part. Pitch can be reduced to 1/2 of the pitch of the open barrel, which can be crimped by the conventional crimp tool, for the crimp at a high density.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a technique for crimping an electric wire onto a contact conductor of a connector in which the contact conductor is arranged at a high density because it is connected to the tip of a multi-core cable.

[0002]

2. Description of the Related Art There are a crimp connection method and a crimp connection method as a connection method for a multi-terminal cable connector and a multi-core cable, but the crimp connection method is preferable from the viewpoint of reliability of the connection portion. Therefore, conventionally, as shown in FIG. 6, a plurality of contact conductors 1 each having a connector contact 2 at one end and an open barrel 3 for crimping an electric wire at the other end are arranged at equal intervals in a direction orthogonal to the longitudinal direction. Then, a contact assembly is produced by performing insertion molding with the molded resin body 4 that is an insulator, put the stripped wire conductor on the open barrel 3 for wire crimping, and use a crimping tool as shown in FIG. The wire is crimped to the barrel by applying pressure by sandwiching it.

The crimping tool of FIG. 7 has two parts, the anvil assembly 13 on the lower side and the crimper 12 on the upper side. The anvil assembly 13 is provided with a plurality (four in the figure) of anvil portions 8 which protrude upward and whose upper end portions are curved concave portions. The upper crimper 12 is formed with a recess upward so as to correspond to each anvil portion 8. The shape of the crimper 12 becomes slightly narrower as it goes up, and at the upper part it is rounded inward and slightly down, so it is just a double peak. It has a shape. This is called the crimper section.

In crimping, the lower portion of the open barrel 3 on which the electric wire to be crimped is placed is placed on the anvil portion 8 and the crimper 12 is pushed down from above. As a result, the tip ends of the V-shaped blades of the open barrel 3 are entwined with each other so as to be rounded according to the curve of the crimper portion 7, and as a result, the electric wires are wrapped and tightened as shown on the right side of FIG. In this way, by one crimping operation, the open barrel electric wire is crimped by the number of pairs of the anvil portion and the crimper portion of the crimping tool. FIG. 8 is a perspective view showing a state in which five electric wires are crimped and fastened to an open barrel for crimping.

[0005]

However, the following problems have arisen in the above-mentioned conventional techniques. In recent years, along with the increase in the number of signal inputs and outputs in electronic devices, there is a tendency toward high density and multiple cores in component mounting, particularly in connectors, and the number of cores is increasing and the pitch between contacts is required to be smaller. As a result, the pitch of the anvil portion 8 and the crimper portion 7 of the crimping tool shown in FIG. 7 must be narrowed according to the pitch between the contacts, but the crimper portion 7 is crimped and deformed by the open barrel entering therein. Since there is a certain width necessary to go, there is a limit to narrowing the interval. Further, narrowing the pitch of the crimper portion 7 causes a problem that the thickness of the convex portion between the adjacent crimper portions becomes thin and the strength of the crimper itself is lowered.

In view of the above-mentioned problems of the prior art, an object of the present invention is to provide an open barrel of contacts arranged at a pitch of ½ of the minimum interval of the recesses of the crimping tool, regardless of the minimum interval. An object is to provide an open barrel contact assembly and an open barrel crimping tool capable of crimping an electric wire.

[0007]

The open barrel contact assembly and the open barrel crimping tool of the present invention have the following configurations in order to achieve the above object. First, in an open barrel contact assembly, a plurality of contact conductors for connectors are held through an insulator at a central portion thereof, and the open barrel of the wire crimping portion is provided on one surface of the insulator with two parallel straight lines at predetermined intervals. Are arranged at equal intervals along each other and offset by one-half of the intervals, and the V-shaped openings of the open barrel are arranged so that the directions of the V-shaped openings are opposite to each other. Is characterized by.

Next, the open barrel crimping tool has recesses and projections alternately repeated at equal intervals in one direction in a sectional shape, and the intervals between the projections and the projections and the intervals between the recesses and the recesses are on a straight line. The height of the unevenness corresponds to the distance between two rows of open barrels, the crimper part is formed on the bottom of the concave part, and the anvil part is formed on the tip part of the convex part. The comb-toothed structure is characterized in that it has a structure in which two structures are opposed to each other with their convex and concave sides facing each other, and their own convex portions fit into the mating concave portions.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the embodiment of the present invention, when connecting a multi-core connector to the end of a multi-core cable, each core wire of the cable is crimp-connected to a connector contact having a narrower pitch than before. It is implemented as an open barrel crimping tool that crimps the open barrel contact assembly and the core wire of the multi-core cable.

[0010]

Embodiments of the present invention will be described below with reference to the drawings using embodiments. FIG. 1 is a perspective view showing an embodiment of a contact assembly of the present invention, in which 1 is a contact conductor, 2 at the front end thereof is a connector contact, and 3 at the rear end thereof is an open barrel of a wire crimping portion. Its shape is V-shaped when viewed in cross section on both wings that wind the electric wire. Reference numeral 4 is a molded resin body that is an insulator, and is inserted by insertion molding so that the central portion of the contact conductor 1 penetrates the molded resin body 4. For convenience of explanation, this figure shows the six open barrels from the left before the wire is crimped, and the four open barrels from the right after the wire is crimped.

The array of open barrels 3 on one surface (rear surface) of the molded resin body is such that linear arrays at equal intervals are arranged in parallel in two rows, the upper row and the lower row, and the open barrels in one row. Is positioned so as to correspond to the center position of the distance between the open barrels of the other row. The directions of the V-shaped openings of the open barrel are set to face the sides opposite to each other.

With respect to such an array of open barrels, the open barrel 3 on which the electric wires are placed is crimped by a crimping tool as shown in FIG. The crimping tool 6 of FIG. 2 includes crimping tool upper teeth 6a and crimping tool lower teeth 6b, and FIG. 2 shows a state in which the upper teeth 6a and the lower teeth 6b have just meshed with each other. Reference numeral 9 is a cavity (cavity) in which the barrel to which the electric wire is wound and crimped is positioned. That is,
The position of each cavity 9 corresponds to each position of the open barrel 3 in FIG.

In the crimping tool 6, both the upper teeth 6a and the lower teeth 6b have recesses and protrusions alternately arranged at a constant pitch in one direction when viewed in cross section, and the bottoms of the recesses are the same. Since the crimper portion 7 is formed and the anvil portion 8 is formed at the tip of the convex portion and shows the same shape, the same two can be used for the upper and lower teeth. When the open barrels arranged as shown in FIG. 1 are crimped using the crimping tool 6 as shown in FIG. 2, the crimped state as shown in FIG. 3 is obtained.

By the way, in the conventional crimping tool shown in FIG. 7, if the minimum pitch of the crimper portion that can be tolerated is P in view of the required width and the required strength of the crimper portion, the crimping according to the present invention is performed. In the tool 6 as well, as shown in FIG. 2, the pitch of the crimper portion 7 is allowed to be narrowed to P. In that case, as can be seen from FIGS. 2 and 3, the interval between the pressure-bonding portions 10 is P / 2. That is, by using the contact assembly and the crimping tool of the present invention, the arrangement pitch of the contacts in the connector can be reduced to half.

Next, a method of molding the contact conductor 1 on the molded resin body 4 as shown in FIG. 1 will be described with reference to FIG. In FIG. 4A, the contact conductors 1 are supported on the carrier 11 by the open barrel 3 at intervals of the pitch P, and the V-shaped openings of the open barrel 3 are erected to face this side of the paper. It shows the state. Similarly, (b) is stood at a pitch P with a shift of P / 2 from the case of (a), and the V-shaped opening of the open barrel 3 is set up to face the other side, contrary to (a). It shows the state.

FIG. 4 (c) shows a state in which (a) is on the front side and (b) is on the other side, and a spacer having a predetermined thickness is sandwiched as necessary to superpose them. There is. When the central portion of the contact conductor 1 is solidified with a molded resin body while maintaining the state of (c), it becomes as shown in (d). FIG. 5 shows the state in which the carrier 11 is removed. Here, regarding the display of the direction of the open barrel 3 through FIG. 4 and FIG. 5, the one with a horizontal line inside indicates that the V-shaped opening faces this, and the one with nothing displayed is the other. It shows that it is facing to the side. In this way, the contact assembly as shown in FIG. 1 is obtained.

Even if the crimping portions 10 are arranged in two rows as shown in FIG. 3, in order to arrange the connector contacts on the opposite side in a horizontal line, the contact conductors need to have a required axial center in the longitudinal direction. It is sufficient to have a crank shape for shifting.

[0018]

As described above, according to the present invention, the open barrel of the wire crimping portion of the contact conductor held through the insulator is equidistantly spaced along the two parallel straight lines at the predetermined intervals. The V-shaped openings of the open barrel are arranged so as to be offset from each other by one half of the interval, and the V-shaped openings of the open barrel are opposed to each other, and the crimping tools are equally spaced from each other. A concave portion and a convex portion having a depth corresponding to the distance between them are alternately and repeatedly provided, and an interval between the convex portion and the convex portion and a distance between the concave portion and the concave portion are P, and an anvil portion is formed at the tip of the convex portion. At the bottom of the structure, two crimper-forming structures are faced to each other so that the concavities and convexities of the crimpers are fitted to each other so that the open barrel having the above-mentioned arrangement is crimped. Wire pressure to the open barrel of the contact conductor It is possible.

This is because the spacing between the contact conductors that can be crimped was only P if the spacing between the crimper portions of the crimper of the conventional crimping tool was P, but the arrangement spacing of the contact conductors can be reduced to 1/2. This means that there is an advantage that the density of wire crimping to the multi-core connector of the multi-core cable can be increased. Further, in the crimping tool of the present invention, since the same upper and lower teeth can be used, there is an advantage that only one kind of tool is required.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of an open barrel contact assembly of the present invention.

FIG. 2 is a structural diagram of an embodiment of a crimping tool of the present invention.

FIG. 3 is a front view of the open barrel contact assembly of the present invention when crimped by the crimping tool of FIG.

FIG. 4 is a diagram showing a manufacturing procedure of the open barrel contact assembly of the present invention.

5 is a plan view of an open barrel contact assembly manufactured by the manufacturing procedure of FIG. 4. FIG.

FIG. 6 is a perspective view of a conventional open barrel contact assembly.

FIG. 7 is a crimping tool for a conventional open barrel contact assembly.

FIG. 8 is a perspective view of a conventional open barrel contact assembly that has completed wire crimping.

[Explanation of symbols]

 1 Contact Conductor 2 Connector Contact 3 Open Barrel 4 Molded Resin Body 5 Wire 6 Crimping Tool 6a Crimping Tool Upper Teeth 6b Crimping Tool Lower Teeth 7 Crimper 8 Anvil 9 Cavity 10 Crimping 11 Carrier 12 Crimper 13 Anvil Assembly

Claims (2)

[Claims] 1. A plurality of contact conductors for a connector are held at their central portions through an insulator, and an open barrel of the wire crimping portion is provided on one surface of the insulator along two parallel straight lines at predetermined intervals. The V-shaped openings of the open barrels are arranged at equal intervals and offset from each other by ½ of the intervals, and the V-shaped openings of the open barrels are arranged so as to face the opposite sides of the other rows. Open barrel contact assembly. 2. A cross section of an open barrel in which concave portions and convex portions are alternately repeated at equal intervals in one direction, and the distance between the convex portions and the convex portions and the distance between the concave portions and the concave portions are arranged in a straight line. Similar to the interval, the height of the unevenness corresponds to the interval between the two rows of the open barrel, the crimper part is formed on the bottom of the concave part, and the anvil part is formed on the tip part of the convex part. An open barrel crimping tool having a structure in which two of the structures face each other with their convex concave portions facing each other and their own convex portions fit into the mating concave portions.