JP2571075Y2 - Connection box for fusible link - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a junction box for a fusible link, and more particularly, has versatility suitable for at least two types of fusible links having different external dimensions used for protection of a power supply circuit in a vehicle or the like. Regarding junction box.

[0002]

2. Description of the Related Art Conventionally, fusible links used in vehicles such as automobiles have fusible links having various external dimensions according to their rated currents, and especially fusible links for protecting electric circuits in automobiles. Is 1
Several types of rated current are used for each unit,
Their dimensions are also different from each other. Accordingly, at least two types of fusible link connection boxes to which lead wires for connecting the battery power supply and each electric device are attached are required naturally. This will be clarified by comparing the difference in the outer dimensions of the two large and small fusible links and the connection box shown in FIGS. 3 and 4. FIG. 3 shows a small-sized fusible link and FIG. 4 shows a large-sized fusible link and a connection box for receiving them.

Prior to a specific comparison, the configuration of a general fusible link and its junction box will be schematically described. Ca and Cb denote the entire fusible link, and include a substantially rectangular parallelepiped synthetic resin housing 110 containing a U-shaped fuse therein, and two hooks connected to each end of the fuse and respectively hanging from the housing. And a transparent cover fitted on the upper part of the housing 110. Further, in the small fusible link shown in FIG. 3, the leg 122 has a U-shaped notch 123 opened at the lower end thereof, and the connection box 103
After fitting into the boss portion b having a screw hole projecting from the central wall I, the boss portion is engaged so as to straddle the surface thereof, and the terminal A of the lead wire connected to the power supply or the electric device is superimposed thereon. Further, by screwing a screw D into the screw hole, the screw D is tightened and fixed to the central wall I, and at the same time, an electrical connection is achieved.

The junction box 103 has a substantially cubic shape as shown in the figure. Basically, a top plate H and the central wall I hanging down from the center of the back surface of the top plate along its length are integrally formed. In the upper surface of the top plate H, two recesses are defined by the peripheral wall F and the partition wall G such that the housings 110 of the two fusible links Ca and Cb having the same external dimensions are appropriately fitted. The bottom surface, that is, the upper surface, is provided with two parallel pairs of elongated through holes E, through which the two legs 122 can be inserted. This means that the thickness of the center wall I must be shorter than the distance between the pair of through holes E.

The construction of the fusible links Ca, Cb and the junction box 103 shown in FIGS. 3 and 4 is substantially as described above, but in FIG. 4, the legs of the large fusible link Cb are U-shaped. A round hole f corresponding to the boss b is formed instead of the notch 123, and the boss b corresponds to the round hole f in use.
Also, the leg 122 is provided with both fusible links Ca and C.
b both have a U-shaped cross section as shown in FIG.
Each edge has a flange e that is folded inward at a right angle, and has a length less than or equal to the width of the through hole E. The outer dimensions of the large and small fusible links Ca and Cb and the connection box 103 are compared with each other according to FIGS.

A comparison between the distance z ₁ between the two legs 122 of the small fusible link shown in FIG. 3 and the distance z ₂ between the _two legs 122 of the large fusible link shown in FIG. Are the same. The effective length P of the leg 122 measured from the center of the boss b toward the housing 110 when the fusible links are mounted on the connection boxes, respectively.
Comparing ₁ and P ₂ the former is shorter than the latter. Next, the connection box 103 will be compared. FIG width x ₁ along the permeable hole pairs E of the recess in the 3 has become smaller than the width x ₂ in FIG. 4, but vertical length y ₁ and y ₂ are the same.

As described above, the conventional connection box is required to have a size adapted to the effective leg length of the fusible link to be fitted and the width of the housing in each case. In addition, especially in a small passenger car, a number of connection boxes are arranged in a narrow place, and when the fusible link is mounted, there is a risk that the mounting work may be troublesome due to a difference in dimensions and the insertion part may be damaged. On the other hand, in terms of manufacturing, it is obvious that dies corresponding to the respective dimensions are required, which is disadvantageous in terms of economy and efficiency.

Further, FIG. 5 shows a cross section of the leg portion 122 fitted in the elongated through hole E. The flanges e on both sides and the vertical side wall facing the junction box side are fusible. As a result of repeated rubbing due to the attachment and detachment of the link, wear occurs due to wear, and as a result, the U-shaped notch 123 or the round hole f at the tip portion of the leg may not accurately correspond to the boss b. As a result, there is a possibility that the connection with the lead wire may be hindered and sufficient electrical connection may not be performed.

[0009]

The connection box for a fusible link according to the present invention has a new structure capable of fitting a fusible link having several dimensions different from the conventional connection box as described above and is attached. It is an object of the present invention to provide a connection box with high stability.

[0010]

SUMMARY OF THE INVENTION The object of the present invention is to provide a horizontal box-like portion having a pair of elongated through holes parallel to the opposite side of the peripheral wall at the bottom, and a thickness corresponding to the distance between the pair of through holes. has and the fusible link connection box comprising a vertical wall portion having a terminal nut on each side wall depending from the box-like lower surface along the transparent hole pairs, of the peripheral wall
The wall is formed with an inner inner peripheral wall perpendicular to the bottom and a horizontal step
And a vertical outer inner peripheral wall coupled through
Form, and provided a flange for inserting hole pairs in the direction respectively opposed to the respective end portions of said permeable hole pairs formed in the bottom portion, along the insertion hole on both side walls surfaces of the vertical wall portion This is achieved by providing a junction box for a fusible link characterized by being hung down.

[0011]

The junction box according to the present invention has the inner wall of the peripheral wall facing the bottom.
To the vertical inner peripheral wall through a horizontal step
A vertical outer inner peripheral wall and a bottom
Facing each end of each pair of through holes
A plurality of pairs of flange insertion holes are provided in the direction, and the insertion holes are
Ru der can be fitted a plurality of kinds of fusible links having different outer dimensions by which allowed hanging along either side wall of the vertical wall portion. Also, a plurality of pairs of holes are provided at both ends of the pair of through holes.
It different plural kinds of fusible links so hole itself by providing the flange for inserting hole is shaped as a result co
Insert the flanges formed on both edges of the leg
For accurate positioning of legs and secure
Retention can be ensured .

[0012]

1 and 2, a fusible link connection box 1 according to the present invention is integrally formed of a heat-resistant synthetic resin material and comprises a horizontal box-shaped portion 2 and a vertical wall portion 3. FIG. . The horizontal box portion 2 is formed in a rectangular box shape corresponding to the outer dimensions of the housing 110 of the fusible links Ca and Cb as shown in FIGS. The fusible link has substantially the same shape as that shown in the conventional example, and does not form a main part of the present invention. And use the same reference numerals.
Further, in the bottom 4 of the horizontal box-shaped portion 2, elongated thin holes 5 parallel to each other are formed in pairs and are formed in parallel with the opposing sides of the peripheral wall 6. Further, the inside thereof is stepped in order to be able to accommodate the housing 110 of a plurality of types of fusible links Ca and Cb having different external dimensions. Particularly, in this embodiment, two types of external dimensions of large and small are used for convenience of explanation. There are two stages to apply to different housings.

The vertical wall portion 3 is coupled below the horizontal box-shaped portion 2 and has a thickness corresponding to the distance between the pair of through holes 5 and 5 and hangs down along the pair of through holes. The horizontal box portion 2 and the vertical wall portion 3 have a T-shaped cross section as shown in the figure. Furthermore, both side surfaces 10, 10 of the vertical wall portion
A round hole f or U provided near the free end of the fusible link leg 122 descending through the pair of through holes.
A terminal nut 9 engraved with a screw thread protrudes inside the abutment 123, and these abutting portions of the leg are screwed with a bolt or screw D together with a lead terminal A of a power supply or an electric device into the screw thread. It is fixed by tightening. Therefore, the surface of the terminal nut 9 must be aligned with the through-hole in the vertical direction, and must be provided so as to correspond to the longitudinal center position of the through-hole.

Normally, the two legs 122 of the fusible links Ca and Cb are provided with a pair of flanges e and e which are bent inward at right angles at both side edges and project in opposite directions, respectively. As is clearly shown in FIG. 2, the elongated through-hole 5 has first through holes 7, 7 at both ends for guiding and inserting these flange pairs. This insertion hole is naturally arranged in the direction facing the other through hole. Therefore, the through hole 5 has a shape that wraps around the entire leg portion, so that accurate positioning and holding with respect to the terminal nut 9 can be performed. Further, second insertion holes 8, 8 are formed in parallel with the first insertion holes at positions equidistant from the first insertion holes 7, 7 so as to correspond to the flanges of the small fusible link legs. Has been established. Therefore, the through hole pair enables the insertion of the fusible link legs 122 of two different sizes, and also enables accurate positioning and secure holding of the terminal nut 9.

The first and second through holes 7 and 8 are formed along two side surfaces 10 and 10 of the vertical wall 3 with two grooves 11 and 11.
And further depending on the fusible link leg to further improve accurate positioning and secure retention. However, as can be seen from the description of the conventional example based on FIGS. 3 and 4, the effective lengths P ₁ and P ₂ of the large and small fusible link legs 122 and the outer dimensions of the housing 110 are different from each other. In order to use one type of fusible link in one connection box, in addition to the above-described positioning of the through hole 5 with respect to the width of the leg, the inner peripheral wall of the horizontal box-shaped part 2 has the outer peripheral dimension and the holding height position of the housing 110. Needs to be matched.

In the present invention, in order to solve this problem, the inner wall of the peripheral wall 6 of the horizontal box-shaped portion 2 is connected to an inner inner peripheral wall 12 perpendicular to the bottom 4 via a horizontal step portion 14. A step-like configuration consisting of a vertical outer peripheral wall 13;
The lower shoulder portion of the housing 110 of the two types of fusible links Ca and Cb is closely surrounded to achieve more stable positioning of the leg portion 122 with respect to the terminal nut 9 and secure holding of the housing.

[0017] In practical fitted state, for example, in the case of small fusible link, when fitted to small fusible link shown in Figure 3 in a horizontal box-like portion 2, the housing 110 is within the inner side wall 12 and a bottom portion 4 is securely held.
In the case of a large fusible links shown in FIG. 4,
By setting the height of the inner inner peripheral wall to the difference between the effective lengths of the legs, that is, the length of P ₂ -P ₁ , and setting the vertical and horizontal lengths of the outer inner peripheral wall 13 to the outer dimensions of the housing 110, lower shoulder of the housing is placed on the stepped portion 14, and the outer peripheral surface thereof is reliably held by the outer inner wall. In an actual design, the inner inner peripheral wall 12 does not necessarily need to be provided over the entire circumference, but may be provided at only four corners.

When the fusible link connection box according to the present invention also serves as two or more different sizes of fusible links, an insertion hole is further connected to the through hole according to each of the dimensions described above. Then, the height of the inner peripheral wall and the width of the step may be set. Therefore, the junction box according to the present invention can be used for a considerable variety of fusible links. It is also possible to manufacture such a connection box integrally or detachably as a series of units.

[0019]

Advantages of the Invention The connection box for a fusible link according to the present invention can share a plurality of fusible links having different external dimensions, so that not only the efficiency in manufacturing but also the fusible to be fitted when used is used. As long as the type of bull link is not mistaken, it can be easily and surely attached and the efficiency of work can be improved. In addition, since the shape of the through hole corresponds to the cross-sectional shape of the leg, it is excellent in mounting stability, and the structure such as the case where a plurality of connection boxes with different rated currents are manufactured as a series of units as conventionally seen. Since they are all the same, the design of a molding die is extremely easy, which is extremely large in contributing to a reduction in manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a connection box for a fusible link according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a perspective view of a conventional small fusible link connection box.

FIG. 4 is a perspective view of a conventional large-sized fusible link connection box.

FIG. 5 is a partial plan view of the bottom of a conventional fusible link connection box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection box 2 Horizontal box-shaped part 3 Vertical wall part 4 Bottom part 5 Through-hole 6 Peripheral wall 7 First insertion hole 8 Second insertion hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A horizontal box-shaped portion having a pair of elongated through holes parallel to each other at the bottom thereof and formed in parallel with opposing sides of a peripheral wall, and a thickness corresponding to a separation distance between the pair of through holes. And a vertical wall portion having terminal nuts on both side walls and hanging down from the lower surface of the box-shaped portion along the fusible link .
Vertical outer circumference connected to side inner circumference wall through horizontal step
Wall-shaped and perforated at the bottom
Fusible wherein said providing a plurality of pairs of flange insertion hole in a direction respectively opposed to the respective end portions of the permeable hole pairs, yielding hanging along the insertion hole on both side walls surfaces of the vertical wall portion Connection box for link.