JP2000294307A - Press-contact terminal metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press-contact terminal metal fitting in which there is no danger that a core wire is damaged when the core wire is inserted into a press-contact portion. SOLUTION: An electric wire press-fitting groove 6 for allowing an electric wire 2 to be inserted thereinto is formed at a press-contact portion 5. A cutout 9 enlarged toward an inlet and a contact 10 continuous from the cutout 9 to a depth portion are disposed at both edges 7 of the electric wire press-fitting groove 6. A lightening portion 11 is opened sideways of the electric wire press- fitting groove 6 at the press-contact portion 5. When the electric wire 2 is inserted into the electric wire press-fitting groove 6, the width of the electric wire press-fitting groove 6 can be elastically deformed in the groove width enlarging direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fit terminal fitting having a press-contact portion for making a cut in a coating of an electric wire in accordance with a pushing operation of the electric wire.

[0002]

2. Description of the Related Art FIG. 8 shows a part of a conventional pressure terminal fitting. This type of press contact terminal fitting is provided with a press contact portion 10 for connection with the electric wire 101 behind the connection portion with the mating terminal fitting.
0 is provided. An electric wire press-fitting groove 102 into which the electric wire 101 is pushed is formed in the press-contact portion 100 so as to open vertically to the upper end. More specifically, the upper side of the wire press-fit groove 102 expands like a trumpet,
From the bottom part, it is designed to be continuous with a uniform groove width in the vertical direction. In the process of passing through the part expanded in a trumpet shape, a cut is made in the coating 101B of the electric wire 101,
A cut is made near the boundary 104 between the portion having a uniform groove width and the portion 105 up to the core wire 101A inside the electric wire 101. The electric wire 101 is clamped at a height position in the middle of a portion having a uniform groove width so that the electric wire 101 is pushed further than this and does not return carelessly.

[0003]

SUMMARY OF THE INVENTION Such a press contact portion 10 is described.
The functions required for 0 include ensuring that a cut is made in the coating 101B of the electric wire 101 up to the core wire 101A, and that a certain contact pressure is applied to the core wire 101A to ensure reliable conduction. . But,
After the cut into the wire coating 101B is completed, the wire must pass through a uniform groove width portion until it is held at the deeper pushing position.
A part (several strands) of A may be damaged.

[0004] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a press-connecting terminal fitting having a press-contact portion that does not damage the core wire.

[0005]

According to a first aspect of the present invention, there is provided a press contact terminal fitting formed of a conductive plate material and partially cut into a sheath of an electric wire to form an inner core wire. A press-contact portion capable of making contact is provided, and the press-contact portion is formed with a wire press-fit groove extending from an upper end along a height direction, and at an edge forming the wire press-fit groove. Is a notch formed in the entrance portion to be expanded in a trumpet shape and cut into the electric wire covering to reach the core wire, and a contact portion that is continuous to a deeper portion than this and maintains a contact state with the core wire. Is provided, and further,
At the side of the wire press-fitting groove in the press-contacting portion, a lightening portion is formed which enables an operation of expanding a groove width of the wire press-fitting groove when an electric wire is pushed into the wire press-fitting groove. Starting from a height position where the cut into the covering by the cut portion is completed at the edge of the wire press-fitting groove, and extending to a position near a position where the core wire is kept in contact with the core wire. I do.

According to a second aspect of the present invention, in the first aspect, the lightening portion is formed so as to open to a side edge of the press contact portion.

[0007]

According to the first aspect of the present invention, when the electric wire is pushed into the electric wire press-fitting groove, a notch is gradually made in the electric wire coating in the process of passing through the notch, and the contact with the contact portion is formed. A cut is made up to the core line before passing through the boundary. After that, if it is pushed down to a predetermined depth position (holding position) along the contact portion, the conductive state with the core wire is maintained. By the way, after the cut leading to the core wire is completed, the groove width of the contact portion can be relatively easily deformed in the expanding direction by the lightening portion provided on the side of the wire press-fitting groove until the holding position. Because
It is possible to surely alleviate a situation in which a part of the core wire is cut due to excessive clamping force acting before reaching the holding position. Conversely, during the process of making the cut and maintaining the conduction with the core wire, the groove width is substantially maintained at the initial setting, so that the cutting operation and the maintenance of the conduction are ensured.

According to the second aspect of the present invention, since the lightening portion is formed to be open at the side edge, the wire press-in groove can be more easily expanded and deformed as compared with the case where the lightening portion is formed without opening. Can be done. Therefore, for example, when the pressure contact terminal fitting is housed in a resin connector housing, even if the pressure contact portion is expanded and deformed, the deformation operation is restricted by the resin wall in the housing. Since the hollow portion is formed to be open to the outside, it is possible to deform the wire press-fit groove so as to expand and deform while being restrained by the resin wall.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> Next, a first embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 shows a state before the electric wire 2 is connected to the press-connecting terminal fitting 1. In the center of the electric wire 2, a core wire 2A
Are provided, and the periphery thereof is surrounded by the coating 2B.

The press-fit terminal fitting 1 is formed by bending a conductive plate material, and has a box-shaped front portion (left side in FIG. 1) that can be connected to a counterpart terminal fitting (not shown). A connecting portion 3 is provided. Behind the connecting portion 3 (the right side in FIG. 1), the bottom surface of the press-connecting terminal 1 is cut and raised so that the press-contact portion 5 is located between the left and right side walls 4.
Is provided.

The press contact portions 5 are formed in a pair of front and rear, and each press contact portion 5 has, as shown in FIG. 2 and the like, an electric wire press-in groove 6 capable of pushing the electric wire 2 along the height direction from the upper end. Is provided. A pair of left and right edges 7 forming the wire press-fit groove 6
Has a notch 9 that expands in a trumpet shape in the direction of the entrance (the side into which the electric wire 2 is pushed in), and this notch 9
And a contact portion 10 that is continuous from the back side.

The cut portion 9 makes a contact between the contact portion 10 and the core wire 2A by making a cut in the coating 2B as the wire 2 is pushed. Further, the contact portion 10 maintains a contact state with the core wire 2A.

A lightening portion 11 is opened at the side of the wire press-fitting groove 6 in the press contact portion 5. Lightening part 11
Is formed in a long hole shape communicating from the center of the cutout portion 9 to the contact portion 10, and the press-contact portion 5 can be elastically deformed as the wire 2 is pushed into the wire press-fit groove 6. The position of the lightening portion 11 will be described in detail. The lightening portion 11 is located at a height position where the cutout 9 completes cutting of the electric wire 2 into the coating 2B (in FIG. 2, the connection between the cutout 9 and the contact portion 10). The position is an obtuse angle at the position. Hereinafter, it is provided from a position above the "boundary portion 8"), and a height position (see FIG. 4) where the contact between the core wire 2A and the contact portion 10 is maintained. , The position indicated by reference symbol D) to a position slightly above the vicinity.

Next, the operation and effect of the embodiment configured as described above will be described. Wire 2 is pressed
Is arranged along the length direction of the press-connecting terminal fitting 1 (see FIGS. 1 and 2). next,
When the wire 2 is pushed into the wire press-fit groove 6 (FIGS. 2 and 3).
In the direction indicated by “F”, the coating 2B of the electric wire 2 is gradually cut in the process of passing through the cut 9, and reaches the core wire 2A before passing through the boundary 8 with the contact portion 10. (See FIG. 3). Thereafter, a predetermined depth position (holding position,
(The position shown in FIG. 4), the electrical connection between the contact portion 10 and the core wire 2A is maintained. By the way, after finishing the cut to the core wire 2A, until the holding position,
The lightening portion 11 allows the groove width of the contact portion 10 to relatively easily bend and deform in the expanding direction. Therefore, it is possible to reliably alleviate a situation in which an excessive holding force acts on the core wire 2A until the holding position is reached and a part of the core wire 2A is cut. Conversely, during the process of making a cut in the coating 2B and maintaining the conduction with the core wire 2A, the groove width of the wire press-fitting groove 6 is substantially maintained at the initial setting, so that the cutting operation and the continuity are reliably performed. Is made.

<Second Embodiment> Next, a second embodiment will be described with reference to FIGS. Note that, in the present embodiment and the first embodiment, the same reference numerals are given to components having the same operation and effect, and description thereof will be omitted.

The main differences between the present embodiment and the first embodiment are the configuration of the side wall portion for supporting the press contact portion 5 and the shape of the lightening portion 20. That is, in the present embodiment, resin walls 21 made of resin are located on both left and right sides of the press-contact portion 5 instead of the metal plate material shown in the first embodiment. The lightening portion 20 is formed in a rectangular shape so as to open at the left and right side edges of the press contact portion 5. The lightening portion 20 is moved from the position above the boundary portion 8 to the core wire 2A.
The opening is provided over a height position D (shown only in FIG. 7) slightly higher than the height position D (shown only in FIG. 7) for maintaining contact between the contact portion 10 and the contact portion 10.

In the second embodiment thus formed, similarly to the first embodiment, when the electric wire 2 is pushed into the press contact portion 5, the cut portion 9 is elastically deformed in the expanding direction. At this time, since the lightening portion 20 is formed so as to be open at the side edge of the press contact portion 5, the wire press-fitting groove 6 can be more easily expanded and deformed as compared with the case where it is formed without opening. Can be.

Therefore, for example, when the press contact metal fitting is housed in a resin connector housing,
The deformation of the press contact portion 5 in the expanding direction is caused by the resin wall 2 in the housing.
Even in the case where the deformation operation is restricted in 1, since the lightening portion 20 is formed to be open outward, the wire press-fitting groove 6 is expanded and deformed while being restrained by the resin wall 21. Such deformation becomes possible.

The present invention is not limited to the above embodiment, and for example, the following ones are also included in the technical scope of the present invention. (1) In the present embodiment, only the female press contact terminal fitting 1 is shown, but according to the present invention, the male press contact terminal fitting may be used. (2) In the present embodiment, the boundary between the cut 9 and the contact 10 is formed at an obtuse angle. However, according to the present invention, a smooth curve may be used.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment before an electric wire is connected to a press-connecting terminal fitting.

FIG. 2 is a cross-sectional view before an electric wire is pushed into a press contact portion.

FIG. 3 is a cross-sectional view showing a state in which an electric wire is pushed into a press contact portion.

FIG. 4 is a cross-sectional view after an electric wire is pushed into a press contact portion.

FIG. 5 is a cross-sectional view before pushing an electric wire into a press contact portion in the second embodiment.

FIG. 6 is a cross-sectional view during the operation of pushing the electric wire into the press contact portion.

FIG. 7 is a cross-sectional view after the electric wire is pushed into the press contact portion.

FIG. 8 is a cross-sectional view before a wire is pushed into a press contact portion of a conventional press contact terminal fitting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Press-connecting terminal fitting 2 ... Electric wire 2B ... Coating 2A ... Core wire 5 ... Press-contact part 6 ... Electric wire press-fitting groove 7 ... Edge 9 ... Cut-out part 10 ... Contact part 11,20 ... Lightening part 21 ... Resin wall

Claims (2)

[Claims] 1. A pressure contact terminal fitting formed of a conductive plate material and partially provided with a pressure contact portion cut into a coating of an electric wire and capable of contacting an inner core wire, wherein the pressure contact portion has an upper end. The wire press-fit groove extending along the height direction is formed at the edge of the wire press-fit groove. A notch portion for making a notch leading to, and a contact portion that is continuous with the back side thereof and maintains a contact state with the core wire are provided. When the wire is pushed into the press-fitting groove, a lightening portion is formed that enables the groove width of the wire press-fitting groove to expand, and the lightening portion is covered by the cutout portion at an edge of the wire pressing-in groove. Incision is completed It begins above the positioning, pressure contact terminal fitting, characterized in that it extends to a position near the position for holding the contact with the core wire. 2. The press-fit terminal fitting according to claim 1, wherein the lightening portion is formed so as to open to a side edge of the press-contact portion.