JPH097650A - Fine diameter cable connecting structure - Google Patents

Abstract

PURPOSE: To provide a fine diameter cable connecting structure which is used for connection of an electric equipment such as telephone or personal computer, particularly, the most suitable for a pen input type curl cord or interface connector, connectable to a fine diameter cable up to about AWG#28-40, minimized in the cut of the conductor of a covered wire, excellent in connecting reliability, not only easy to manufacture at low cost but also applicable to wire kinds in a wide range such as stranded wire, round wire, covered cord wire, and single wire. CONSTITUTION: Two bisymmetric tip parts 5, 6 having flat parts are provided on the lower tip of a terminal edge 4, two each of contact inclined surface parts 7, 8 are formed on the inside of the terminal edge 4 symmetrically seen from the side, and a parallel groove part 9 is provided between the contact inclined surface parts 7, 8. The terminal edge 4 consisting of a conductive plate having a flat side surface is pressed into a covered wire 10 inserted to a V- groove type covered wire insert hole 2 having a V-groove angle (a) consisting of 30 deg.-80 deg. and a relation of V-groove taper angle (b) > terminal edge tip part angle (c) which is preliminarily provided in a plug housing 3, and connected to the conductor 12 of the covered wire 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for connecting electric devices such as a telephone and a personal computer, and is most suitable for a pen input type curl cord, an interface connector, etc.
Can be connected to small diameter cables from 28 to 40, and covered electric wire 1
Not only does the conductor 12 of 0 cut less and has excellent connection reliability, is easy and inexpensive to manufacture, but also has a small diameter that can be applied to a wide range of wire types such as twisted wire, horizontal winding, and single wire. The present invention relates to the cable connection structure 1 .

[0002]

2. Description of the Related Art Conventional connection methods for small-diameter cables generally include crimping, pressure welding, piercing, soldering, etc., but it is possible to connect small-diameter cables (AWG # 33-40). It was only soldering. In addition, the conventional crimping and pressure welding methods generally have a structure in which metal terminals are surrounded or sandwiched, and a thin wire of a small diameter cable (AWG # 3) is used.
In the case of No. 6, 7 twists of φ0.05 mm) were metal-to-metal contact, and disconnection easily occurred, and contact reliability tended to be unstable. To give a specific example, the telephone body and the handset, or the telephone body and a terminal mounted on a wall or the like are connected by a covered electric wire, and recently, the electric wire is press-fitted into the covered electric wire at these electrical connection points. 2. Description of the Related Art An electrical connector that engages a modular plug having a terminal blade that forms an electrical contact and a modular jack for connection has been widely used. FIG. 3A shows a perspective view of a conventional modular plug A ', in which a housing B'is provided with a plurality of terminal blade receiving holes E'in parallel. Therefore, when modular plug A 'is inserted into a modular jack (not shown), modular plug A ' is inserted.
The upper side C ′ of the terminal blade 4 ′ of A ′ comes into contact with the contact portion on the modular jack side to be electrically connected. FIG. 3B shows a conventional example in which the tip G ′ of the terminal blade 4 ′ pierces and connects the covered electric wire 10 ′, before the tip G ′ of the terminal blade 4 ′ pierces the covered electric wire 10 ′. 3 is an enlarged view of the state. At the lower end of the terminal blade receiving hole E ', the covered electric wire 10'
A flat-shaped covered electric wire insertion hole D'in which is inserted is communicated and opened. FIG. 3C shows an enlarged cross-sectional view with the connection completed. As is clear from the figure, in the method of piercing and penetrating, the conductor 12 'of the covered electric wire 10' is often cut, so that there is a drawback that a poor conduction is likely to occur and a change in connection resistance occurs. Therefore, in Japanese Utility Model Laid-Open No. 5-6694, dated January 29, 1993, by devising a terminal blade 4 having a shape as shown in FIG. done. However, when this terminal blade 4 is applied to a thin wire, as is apparent from FIG. 2A, the terminal blade 4 used in the present invention is inserted into the conventional covered wire insertion hole 14 'formed flat. In this case, there was a case where it came off as shown in FIG. In order to prevent this, as shown in FIG. 2C, the conventional flat and covered electric wire insertion hole 15 'is used.
It was tried using another housing in which the space between the two was narrowed.
However, although the disconnection of the wire has been resolved,
Even with this, there was no improvement in cutting the conductor.
As a cause of this, since the conductor of the small-diameter electric wire is very thin, the strength is not provided with the conventional press contact amount, so that the wire breakage occurs. That is, in order to obtain a complete pressure contact structure with a pressure contact type terminal, the wire may be broken due to the thin wire.For example, for a thin wire such as a twisted wire, a foil horizontal winding, and a round wire horizontal winding. When applied, there was a technical problem that stable connection reliability could not be obtained.

The present invention, in order to overcome these drawbacks,
As a result of diligent study, it is used for connecting electric devices such as a telephone and a personal computer, and is most suitable for a pen input type curl cord, an interface connector, etc. Conductor 12
A small diameter cable connection structure that can be applied to a wide range of wire types such as twisted wire, horizontal winding, single wire, etc.
The purpose of the present invention is to provide two symmetrical left and right tip portions 5 and 6 having a flat portion at the lower tip of the terminal blade 4, and The contact slopes 7 and 8 are symmetrically inward when viewed from the side, respectively.
A terminal blade 4 made of a conductive plate material, which is individually formed and has parallel grooves 9 between the contact slope portions 7 and 8 and whose side surfaces are flat, is provided in the plug housing 3 in advance at 30 °.
V groove angle a consisting of ˜80 ° and V groove taper angle b> terminal blade tip angle c> the V groove type covered wire insertion hole 2 is press-fitted into the covered electric wire 10 and the covered electric wire 10
The small-diameter cable connection structure 1 is characterized in that it is connected to the conductor 12.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the small diameter cable connecting structure 1 of the present invention will be described below in detail with reference to the accompanying drawings. Fig. 1 (a)
FIG. 3 is an explanatory view seen from a cross section of the small diameter cable connection structure 1 before the terminal blade 4 is press-fitted into the covered electric wire 10 inserted into the V groove type covered electric wire insertion hole 2 in the embodiment of the present invention. FIG.
(B) is an example of the present invention, and is an explanatory view seen from the cross section of the small diameter cable connection structure 1 after the terminal blade 4 is press-fitted into the coated electric wire 10 inserted into the V-groove type covered electric wire insertion hole 2. Is. 1C shows a plan view and a side view of the terminal blade 4 used in the present invention, and FIG. 1D shows a state where the terminal blade 4 used in the present invention is press-fitted into the conductor 12 of the covered electric wire 10. It is a perspective view. As is apparent from the figure, two symmetrical left and right tip portions 5 and 6 having a flat portion are provided at the lower tip of the terminal blade 4, and the contact slope portion is symmetrical inside the terminal blade 4 when viewed from the side. Two terminal blades 7 and 8 are formed, a parallel groove portion 9 is provided between the contact slope portions 7 and 8, and a side surface of the terminal blade 4 made of a conductive plate material is formed in the plug housing 3 in advance. The V having a relation of V groove angle a and V groove taper angle b> terminal blade tip angle c formed of 30 ° to 80 ° provided
The small-diameter cable connection structure 1 is characterized by being press-fitted into the covered electric wire 10 inserted into the groove-shaped covered electric wire insertion hole 2 and connected to the conductor 12 of the covered electric wire 10. Since the structure is as described above, as the first step, since the V-groove type covered electric wire insertion hole 2 of the plug housing 3 has the V-groove type,
The covered electric wire 10 is naturally guided to the lowermost position of the V-groove type and arranged at the central position. As the second step, the terminal blade 4 of the present invention is inserted into the terminal blade receiving hole in the connector housing, and the tip portions 5 and 6 thereof reach the covered electric wire 10. As the third step, when the terminal blade 4 is press-fitted, the sheath (coating) 11 is pierced by the projecting blade, and the conductor 12 of the coated electric wire 10 enters between the two contact slope portions 7 and 8 symmetrically provided. Since the covered electric wire 10 is arranged at the central position in advance, it does not come off, and if the covered electric wire insertion hole is formed flat, the amount of the conductor entering the terminal blade increases, which may cause breakage. However, in the case of the present invention, since it is a V-groove type, the amount of the conductor 12 of the covered electric wire 10 entering the terminal blade is reduced and the direction is relaxed, and plastic deformation occurs in the opposite directions. Figure 1
Arrange them in a meandering manner as shown in (d). As the fourth step, when the terminal blade 4 is further press-fitted, the conductor 12 of the covered electric wire 10 is further press-fitted from the two contact slope portions 7 and 8 in the depth direction of the parallel groove portion 9 with plastic deformation. In this way, a more reliable connection can be obtained by the meandering arrangement of the parallel groove portion 9 and the conductor 12. As a result of trying the experiment under various conditions, as the V groove angle a, 30 ° ~
It can be used in the range of 80 °, but is preferably 45 °
-60 ° was optimal. When the cable becomes thinner, for example, in the case of AWG 36 or less, it is necessary to reduce the gap d as shown in FIG. 1, and when the cable is pressed with an excessive force, it is broken if it is a connection between metals. In the case of the present invention, since the metal of the thin wire and the plastic of the housing are connected, the plastic of the housing deforms to release the force even if an excessive force is applied, so that no disconnection occurs and a good contact pressure can be obtained. . From the above, it can be seen that the thin cable connection structure 1 of the present invention comprises a combination of spring pressure contact and pressure contact. Further, since the tip portions 5 and 6 of the terminal blade 4 used in the present invention are arranged on the same plane, they can be easily assembled without tilting or falling when inserted into the plug housing. . Furthermore, the terminal blade 4 used in the present invention can continuously manufacture a thin conductive plate material by press punching. As a result of comparison between the V-groove type covered wire insertion hole 13 of the present invention and the conventional flatly formed covered wire insertion hole 14 'in a thermal shock test and a temperature / humidity cycle test, which are reliability tests, The change value of the contact resistance of the stepped V-groove type covered electric wire insertion hole 13 was 5 mΩ or less, which was about 1/5 of that of the conventional one, and a good result could be obtained.

In the embodiments of the present invention, the V-groove type covered electric wire insertion hole 2 has been described as a representative example, but the present invention is not limited to this, and it goes without saying that various modifications are included within the scope of the present invention. Absent. Also, the shape of the terminal blade 4 and the parallel groove portion 9
Needless to say, it may include various modifications within the scope of the present invention.

[0006]

As is apparent from the above description, the thin cable connection structure 1 of the present invention has less disconnection of the conductor 12 and is gastight (airtight) and reliable due to the meandering arrangement of the parallel groove portion 9 and the conductor 12. It is excellent and strong, and enables reliable connection. Specifically, AWG # 28 to AWG
It can be applied to a wide range of wire materials such as # 40, stranded wire with an insulator diameter of φ0.20 to φ0.62, horizontal winding of foil, horizontal winding of round wire, and thin wire of single wire. Moreover, since the terminal blade 4 used in the present invention has an extremely simple shape, it is easy to manufacture and it is possible to connect each AWG with the same terminal. As described above, it is possible to provide an inexpensive interface connector without deteriorating the simple assembling characteristic of the modular plug. In particular, it can be manufactured at low cost by continuous pressing using a strip plate material,
It is most suitable for small-diameter cables such as pen-input type curl cords, and can exert excellent effects, so its industrial value is great.

[Brief description of drawings]

FIG. 1 (a) is an embodiment of the present invention, in which the terminal blade 4 is viewed from the cross section of the small diameter cable connection structure 1 before being press-fitted into the coated electric wire 10 inserted into the V-groove type covered electric wire insertion hole 2. Fig. (B) In the embodiment of the present invention, an explanatory view seen from the cross section of the thin cable connection structure 1 after the terminal blade 4 is press-fitted into the coated electric wire 10 inserted into the V-groove type covered electric wire insertion hole 2. (C) A plan view and a side view of the terminal blade 4 used in the present invention. (D) A perspective view showing a state where the terminal blade 4 used in the present invention is press-fitted into the introduction 12 of the covered electric wire 10.

2 (a) is a cross-sectional view of the modular plug 1 ′ before the terminal blade 4 used in the present invention is press-fitted into the covered electric wire 10 ′ inserted into the conventional covered electric wire insertion hole 14 ′ formed flat. (B) The coated electric wire 1 in which the terminal blade 4 used in the present invention is inserted into the conventional flatly formed covered electric wire insertion hole 14 '.
Sectional view of the 'modular plug 1 after being pressed into the' 0. Sectional view of (c) terminal blades 4 used in the present invention, a modular plug 1 before press-fitted into 'inserted covered electric wire 10' the conventional flat and covered wire insertion hole 15 which is formed narrow spacing '.

FIG. 3A is a perspective view of a conventional modular plug A ′. (B) A perspective view of a conventional example of a method in which the tip portion G ′ of the terminal blade 4 ′ pierces the covered electric wire 10 ′ before piercing. (C) An enlarged perspective view in which the connection is completed.

[Explanation of Codes] 1 Small-diameter cable connection structure of the present invention 2 V groove type covered electric wire hole 3 Plug housing 4 Terminal blades 5, 6 Tip part 7, 8 Contact sloped surface part 9 Parallel groove part 10 Coated electric wire 11 Sheath (coating) 12 conductor a V groove angle (45 to 60 °) b V groove taper angle c terminal blade tip angle d gap 1 'conventional modular plug 4' terminal edge 10 'covered electric wire 11' sheath (cover) 12 'conductor 14' flat the tip of a conventional modular plug B 'housing C' upper D 'covered wire insertion hole E' terminal blade receiving hole G 'terminal blades' covered electric wire insertion hole a was formed narrow flat and spacing' was covered wire insertion hole 15 formed in the Department

Claims (1)

[Claims] 1. A terminal blade is provided with two symmetrical tip portions each having a flat portion at a lower tip thereof, and two contact slope portions are formed inside the terminal blade symmetrically when viewed from a side surface. A terminal groove made of a conductive plate material having a flat side surface with a parallel groove portion provided between the contact slope portions has a V groove angle a and V of 30 ° to 80 ° provided in advance in the plug housing. A small-diameter cable connection structure characterized by being press-fitted into a covered electric wire inserted into a covered electric wire insertion hole having a relationship of groove taper angle b> terminal blade tip end angle c and being connected to a conductor of the covered electric wire.