JPH08168142A - Wiring circuit for electric joint box and wire cutter for wiring circuit - Google Patents

Abstract

PURPOSE: To obtain a wiring circuit for an electric joint box at low cost and a wire cutter therefor in which a wire can be cut by a single stroke and each circuit can be cut off certainly. CONSTITUTION: The wire cutter 1 comprises a fixed cutter 2 for holding the cutting part 14a of a wire 14, and a driven cutter 3 performing the cutting of the wire 14 and the bending of one cutting end part 14b simultaneously. In a wiring circuit formed by the cutter 1, the pitch H2 of planer pressure contact terminals 7, 7, coming into pressure contact with a wire 14 on the opposite sides of the cutting part thereof, matches the pitch h3 of terminal holes at the connector housing part of an electric joint box. Furthermore, an insulation board is beveled at a part 16a abutting against the bent part of one cut end part 14b. A separator part inserted between the cut end parts 14b, 14c of the wire 14 is encased in the electric joint box.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring circuit in which an internal circuit of an electric junction box for an automobile is composed of an electric wire and a pressure contact terminal which is in pressure contact with the electric wire, and an electric wire cutting device for forming the circuit. In the electric wire cutting portion, the circuit can be surely cut off with a small gap.

[0002]

2. Description of the Related Art Conventionally, in this type of electric junction box, electric wires are laid in place of a bus bar formed by punching a conductive metal plate so as to easily cope with a design change of an internal circuit. Then, the electric wire and the external output terminal are connected to each other and the electric wires are connected to each other by a pressure contact terminal.

Regarding the above-mentioned internal circuit composed of an electric wire and a pressure contact terminal, the applicant of the present invention has previously described, as shown in FIG.
A wiring groove 15 is provided in the insulating plate 6 arranged inside the electric junction box, and the electric wire 14 which is laid in advance in the wiring mold from the start point to the end point in a single-stroke manner is used as the wiring groove of the insulating plate 6. The wire is transferred to 15 and wired, and the pressure-contact terminal is pressure-connected to the wire 14 thus wired.
A method is proposed in which 4'is cut off to divide each circuit.

As shown in FIG. 7, the above-mentioned electric wire is cut by using the electric wire 14 laid in the wiring groove 15 provided in the insulating plate 6.
Both ends P1 and P of the electric wire 14 'of the unnecessary portion shown by diagonal lines
Since 2 is cut and separated from the required electric wire 14, it is necessary to cut at two unnecessary places. For this reason, as the number of unnecessary electric wire locations increases, the cutting work time becomes longer and the work efficiency deteriorates, and a mechanism for removing the cut unnecessary electric wire 14 'is required, resulting in an increase in device cost. .

In order to solve such a problem, there is a method of forming a wiring circuit as shown in FIG. in this way,
As shown in FIG. 8 (A), two thick metal blade plates 11 and 12 using a cutting tool 10 having a tip similar to scissors are used.
The electric wire 14 is cut by the above, and as shown in FIG. 8 (B), the cut ends 14b and 14c are bent at the bending portions 11d and 12d of the blade plates 11 and 12 in opposite directions (arrow b direction) and separated. I am letting you.

According to the above method, the cutting of the electric wire 14 and the bending of both the cutting ends 14b and 14c can be performed in one step, and both the cutting ends are bent in opposite directions to form a large gap, so that a short circuit is surely performed. Can be prevented.

When the two cutting ends are bent in opposite directions, as shown in FIG. 9, the electric wire 14 laid in the wiring groove 15 formed in the insulating plate of the electric junction box is cut by the cutting tool 1 as shown in FIG.
In order to cut at 0, it is necessary to form the tool insertion groove 16 at a position corresponding to the cut portion of the electric wire 14. The width h1 of the tool insertion groove 16 in the wiring direction needs to be a width that allows the cutting tool 10 to be inserted and cut, and after cutting, both of the cut end portions 14b and 14c of the electric wire 14 are provided. In order to bend in opposite directions, it is necessary to make the length about twice (for example, about 5 mm) from the bending fulcrum of the electric wire to the end.

[0008]

However, when the width h1 of the tool insertion groove 16 is set to about 5 mm, the press-fitting holes 18 of the press-contact terminals 17, 17 attached to both sides in the wiring direction with the tool insertion groove 16 sandwiched therebetween. , 18 inevitably widens, and this pitch h2 is larger than the pitch h3 of the terminal holes of the connector accommodating portion formed in the electrical junction box. Therefore, when inserting the input / output terminal portions of the pressure contact terminals 17, 17 on both sides of the cut portion into the adjacent terminal holes of the connector accommodating portion, it is not possible to use an ordinary flat plate pressure contact terminal, and thus the input / output terminal portion. In order to match the pitch of 17a and 17a with the pitch h3 of the terminal holes, as shown in FIG. 9, special pressure-bonded terminals 17 and 17 that are bent are required.
There is a problem of high cost.

The present invention has been made in order to solve the above problems. It is possible to use an ordinary pressure contact terminal formed by simply punching a flat plate to avoid a high cost and to cut an electric wire in one step. An object of the present invention is to provide a wiring circuit for an electric junction box that can reliably cut a circuit, and a cutting device for the electric wire for the circuit.

[0010]

In order to achieve the above-mentioned object, the present invention according to claim 1 comprises an internal circuit of an electric connection box, which comprises an electric wire and a pressure contact terminal pressed against the electric wire. Each cutting is done at one cut portion, and one of the cut ends of the electric wires facing each other at this cut portion is bent so as to be separated from the other cut end by a required distance or more. The present invention provides a wiring circuit for an electric junction box.

When inserting the input / output terminal portion of the pressure contact terminal, which is in pressure contact with the electric wire with the cut portion in between, into the adjacent terminal hole of the connector accommodating portion formed in the electrical connection box, a flat plate pressure contact for pressure contact with the electric wire is inserted. The pitch of the terminals is set to match the pitch of the terminal holes of the connector accommodating portion (claim 2).

Further, the electric wire is inserted into a wiring groove formed in an insulating plate housed inside the electric junction box, while the press-contact terminal press-contacting the electric wire extends linearly from the press-contact blade. The input terminal portion is projected from the terminal hole of the connector housing portion, the insulating plate corresponding to the cut portion of the electric wire,
It is preferable to provide a chamfer with which the bent portion of the one cut end abuts (claim 3).

It is preferable that a separator portion protruding from the case or the insulating plate of the electric junction box is interposed between the cut portions of the electric wires (claim 4).

Further, according to the present invention, in claim 5, the internal circuit of the electric connection box is formed of an electric wire and a press-contact terminal for press-contacting the electric wire. A device for cutting, a fixed cutter that holds the electric wire immovably when cutting the electric wire, and an electric wire that is slid along the fixed cutter and cuts the electric wire held by the fixed cutter, and at the same time cuts one of the electric wires. Provided is a device for cutting an electric wire for an internal circuit of an electric junction box, which is configured by a drive cutter which bends an end portion.

[0015]

First, in the electric wire cutting device according to claim 5,
In the groove formed in the fixed cutter, holding the device so as to insert the cut portion of the electric wire laid in the electric connection box, and in this state, sliding the drive cutter along the fixed cutter, At the same time as cutting the electric wire held so that the drive cutter cannot be moved by the groove, the cut end of the electric wire on the drive cutter side is bent in the driving direction. That is, the electric wire is cut and one of the cut ends is bent simultaneously by one cutting operation.

Further, in the wiring circuit according to claim 1 formed by using the cutting device according to claim 5 or the like, one cutting end portion with respect to the other cutting end portion at a cutting point of an electric wire. Since it is bent so as to be separated by a required distance or more, it is possible to surely divide each circuit. In particular, since only one side of the cut end portion is bent and both are not bent, the distance of the cut portion can be reduced. Further, as described in claim 4, when the separator portion is interposed between the cut ends of the electric wire,
A short circuit at each cut end is more reliably prevented.

Further, in the wiring circuit according to the second aspect,
Set the pitch of the pressure contact terminals that press into contact with the electric wires on both sides to be cut, in other words, set the spacing between the press fit holes of the pressure contact terminals to be equal to the pitch of the terminal holes of the connector accommodating parts into which the input / output terminal parts of these pressure contact terminals are inserted. Therefore, a normal press-contact terminal formed by punching a flat plate can be used as the press-contact terminal press-fitted into the press-fit hole. Therefore, it is not necessary to use a special pressure-bonded terminal that is bent.

In addition, in the wiring circuit according to the third aspect,
Since the shape of the insulating plate at the portion where the bent portion of the electric wire contacts is chamfered, the cut end portion of the electric wire is easily bent, and the distance from the other cut end portion can be increased.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The internal circuit of the electrical junction box according to the present invention is the same as the conventional one shown in FIG. 7, in which the wiring mold is moved to the wiring groove 15 provided in the insulating plate 6 housed inside the electrical junction box, which is a so-called one-writing book. The electric wire 14 is laid in a continuous state, and a pressure contact terminal is driven into the electric wire 14 at a predetermined position and pressure contact is made to form an internal circuit of the electric junction box.

FIG. 1 shows the tip of a cutting device 1 for a wiring circuit according to the present invention, and FIG.
The state inserted in the tool insertion groove 16 formed corresponding to the cutting part 14a of FIG. As shown in FIG. 1 (A), the cutting device 1 is a cutting tool similar to scissors, and is composed of a fixed cutter 2 and a drive cutter 3, and the drive cutter 3
Is provided so as to be slidable along the side surface of the fixed cutter 2.
The fixed cutter 2 is made of a thin metal plate, and has a U-shaped groove 2a opening downward at its tip. On the other hand, the drive cutter 3 is made of a metal material having a trapezoidal cross section that is thicker than the fixed cutter 2, and forms a blade portion 3a at the edge portion on the groove portion 2a side that comes into contact with the fixed cutter 2 and the blade portion. A bent portion 3b that is continuous with 3a and is inclined at a predetermined angle is formed.

When the electric wire 14 laid on the insulating plate 6 is cut by the cutting device 1 having the above-described structure, FIG. 2 (A) (B)
, The tool insertion groove 16 is formed so that the cutting portion 14a of the electric wire 14 is inserted into the groove portion 2a formed in the fixed cutter 3.
Insert the cutting device 1 from above. When the driving cutter 3 is operated to slide in the direction of arrow a as shown in FIG. 1B while holding the cutting device 1 in this state, the groove 2
The electric wire 14 held by the a so as not to move in the direction of the arrow a is cut by the blade portion 3 a of the drive cutter 3. Also,
At the same time, the cut end 14b of the electric wire 14 on the side of the drive cutter 3 is bent by the bent portion 3b of the drive cutter 3 which continues to move in the direction of the arrow a after cutting. The electric wire 14
Since has a rigidity, once it is bent, it does not naturally return to its original straight state.

Thus, according to the cutting device 1, the electric wire 14
The portion to be divided is cut at one place (14a), and at the same time, one cutting end portion 14b is bent and the other cutting end portion 14 is cut.
It can be separated from c. As a result, short-circuiting of the cut ends 14b and 14c can be prevented, and the cutting and bending steps can be reliably performed in one step.

Next, a wiring circuit of the electric junction box formed by using the cutting device 1 will be described with reference to FIGS. In the wiring circuit formed by the cutting device 1, as shown in FIG. 3, among the cut ends 14 b and 14 c of the electric wire cut at the position corresponding to the tool insertion groove 16, the wiring groove 15 is formed.
Only one cutting end 14b extending from the inside into the tool insertion groove 16 is bent, and the other cutting end 14c is cut in a state of slightly protruding from the wall surface of the tool insertion groove 16. Therefore, compared with the width h1 (see FIG. 7) of the tool insertion groove 16 when the cut ends 14b and 14c of the electric wires facing each other in the tool insertion groove 16 are bent in opposite directions and separated from each other, this embodiment In the wiring circuit of, the width H1 of the tool insertion groove 16
Can be about half (for example, about 2.5 mm). Along with this, the pitch H2 of the press-fitting holes 18, 18 of the piezoelectric terminals formed on both sides of the tool insertion groove 16 is set so that the press-connecting terminals 7 in the connector accommodating portion 8 provided in the electric connection box 5 are arranged as shown in FIG. , 7 of the input / output terminal portions 7a, 7a can be made to coincide with the pitch h3 of the terminal holes 8a, 8a through which the input / output terminal portions 7a, 7a are projected. As a result, in this wiring circuit, a normal press contact terminal 7 is formed by simply punching out a flat plate, in which the output / input terminal portion 7a extends linearly from the press contact blade 7b.
Is used, the pitch of the input / output terminal portions 7a, 7a becomes equal to the terminal hole pitch h3. Therefore, it is possible to avoid the high cost associated with the use of the special pressure contact terminals 17, 17 that are bent as shown in FIG.

As shown in FIG. 5, in the above wiring circuit, the distance L for separating one of the cut ends 14b of the electric wire from the other cut end 14c is equal to that of each cut end 14b, 14c. In order to ensure prevention of short circuit, the thickness is preferably 1.5 mm or more.

Further, FIG. 5 shows the shape of a corner 16a where the wall surfaces of the wiring groove 15 and the tool insertion groove 16 intersect, with which the bent portion of the wire comes into contact when the cut end 14b is bent. As described above, when the chamfered shape is formed by a plane that forms an angle of about 45 ° with respect to each wall surface, the cutting end portion 14b can be easily bent, and the other cutting end portion 14b can be easily bent.
Since the separation distance L from c can be made large, a short circuit can be prevented more reliably. In this case, if the corner portion 16b facing the corner portion 16a is also chamfered in the same shape, as shown in FIG.
The cutting end portion 14c of the electric wire can be bent by reversing the inserting direction of the cutting device 1 shown in FIG. Thereby, the cutting device 1 for the tool insertion groove 16
Since there is no restriction on the insertion direction of the wire, the work of cutting the electric wire can be performed quickly. Although the chamfered shape is flat in the present embodiment, other shapes (for example, curved surfaces) may be used.

As shown in FIGS. 6A and 6B, when the insulating case 6 of the electric junction box 5 is covered with the upper case 5a from above, the insulating case 6 is inserted between the cut ends 14b and 14c. If the separator part 5b is provided on the upper case 5,
Since the cut ends 14b and 14c can be completely isolated from each other, the short circuit can be prevented more reliably.

[0027]

As is apparent from the above description, according to a fifth aspect of the present invention, there is provided a device for cutting a wire for a wiring circuit, which comprises a fixed cutter for holding a cut portion of the wire and one of the wires at the same time as cutting the wire. It is composed of a drive cutter that bends the end part and separates it from the other cut end part, and can cut the electric wire and the circuit at the same time with one cutting operation, so that the wiring circuit of the electrical junction box can be efficiently formed. And it can be done reliably.

In the wiring circuit according to the first aspect of the present invention, at one cutting end of the electric wire, one cutting end is bent so as to be separated from the other cutting end by a required distance or more, and the electric wire is rigid. Since there is no natural return to the original linear state, it is possible to surely divide each circuit. In particular, since only one side is bent at the cut end and both are not bent, it is possible to reduce the distance between the press-fitting holes of the press-connecting terminals that press-connect the electric wire with the cut portion interposed therebetween. Further, in the wiring circuit according to the fourth aspect, since the separator portion is interposed between the cut end portions of the electric wire, it is possible to more reliably prevent a short circuit at each cut end portion.

Further, in the wiring circuit according to a second aspect of the present invention, the pitch of the pressure contact terminals that are pressed against each other with the cut portion of the wire sandwiched between the insulating plates provided in the electric connection box, in other words, the pressure contact terminals are pressed in. Since the pitch of the holes is made to match the pitch of the terminal holes of the connector accommodating part formed in the electrical connection box, the output / input terminal part extends straight from the press contact blade formed by punching out a flat plate as the press contact terminal. Existing conventional crimp terminals can be used. Therefore, it is not necessary to use a special pressure-bonded terminal that is bent, and it is possible to avoid an increase in cost.

In addition, in the wiring circuit according to the third aspect of the present invention, the shape of the insulating plate at the portion where the bent portion of one of the cut ends of the electric wire contacts is chamfered.
In addition to facilitating the bending of the electric wire, it is possible to increase the distance from the cut end portion on the other side, thereby reliably preventing short-circuiting at each cut end portion.

[Brief description of drawings]

FIG. 1A is a perspective view of a cutting device of the present invention, and FIG.
(C) is a perspective view of the cutting / bending operation of the electric wire by this cutting device.

2A is a side sectional view showing a cut portion of an electric wire laid in a wiring groove, and FIG. 2B is a side sectional view showing a state where the cutting device of FIG. 1 is inserted into the cut portion of the electric wire. It is a figure.

FIG. 3 is a perspective view showing a wiring circuit of the present invention.

FIG. 4 is a side sectional view showing the relationship between the pitch of the pressure contact terminals press-fitted into the wiring circuit of FIG. 3 and the pitch of the terminal holes of the connector accommodating portion.

5 is a plan view of the wiring circuit of FIG.

FIG. 6 is an electrical junction box, (A) is AA of (B)
It is a line sectional view, and (B) is a side sectional view.

FIG. 7 is a schematic view showing a cutting mode for cutting an electric wire laid in a conventional one-stroke writing into circuits.

8A is a front view showing a state in which an electric wire is inserted into a cutting position of a conventional cutting device, and FIG. 8B is a bottom view of the cutting device shown in FIG.

9 is a perspective view of a wiring circuit formed by the cutting device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting device 2 Fixed cutter 3 Drive cutter 5 Electric connection box 5a Upper case 5b Separator part 6 Insulating plate 7 Pressure contact terminal 7a Output / input terminal part 7b Pressure contact blade 8 Connector accommodating part 8a Terminal hole 14 Electric wire 14a Cutting part 14b, 14c Cutting end Part 15 Wiring groove 16 Tool insertion groove 18 Press-fit hole

Claims (5)

[Claims] 1. An electric connection box, wherein an internal circuit is composed of an electric wire and a pressure contact terminal pressed against the electric wire, and the electric wire is divided into circuits at one cut portion, and the electric wire opposed to each other at this cut portion. 2. A wiring circuit for an electrical junction box, wherein one of the cut ends is bent so as to be separated from the other cut end by a required distance or more. 2. The electricity according to claim 1, wherein the pitch of the flat plate-shaped pressure contact terminals which are pressure-contacted to the electric wire with the cut portion sandwiched therebetween is matched with the pitch of the terminal holes of the connector accommodating portion provided in the electric connection box. Wiring circuit for junction box. 3. The electric wire is laid in a wiring groove formed in an insulating plate for accommodating the inside of an electric junction box, while a press-contact terminal press-contacting the electric wire extends linearly from the press-contact blade. The input / output terminal portion projects from the terminal hole of the connector accommodating portion, and the insulating plate corresponding to the cut portion of the electric wire is provided with a chamfer to which the bent portion of the one cut end contacts. Alternatively, the wiring circuit of the electrical junction box according to claim 2. 4. A separator part protruding from a case or an insulating plate of an electrical junction box is interposed between the cut ends, and any one of claims 1 to 3 is characterized in that. Wiring circuit of the electrical junction box described in. 5. An apparatus for forming an internal circuit of an electric connection box with an electric wire and a press-contact terminal for press-contacting the electric wire, wherein the electric wire is laid in a single stroke and then cut for each circuit. A fixed cutter that holds the electric wire immovably when cutting the electric wire, and a drive cutter that slides along the fixed cutter and cuts the electric wire held by the fixed cutter while bending one cut end of the electric wire. A device for cutting an electric wire for a circuit of an electric junction box, which is configured by