JP3499147B2 - Terminal locking structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a terminal locking structure for double-locking and holding a connected fuse terminal in a fuse box. 2. Description of the Related Art Generally, in an electric connection box such as a fuse box, a fuse and a fuse terminal in a connected state in a housing, which is a terminal accommodating chamber, are double-locked. A terminal retaining structure is provided in which the fuse retainer is inserted from the outside of the housing and incorporated. FIGS. 5 to 7 show a conventional example of a fuse box provided with a terminal locking structure. Housing 1
A plurality of sets of fuses 4 and fuse terminals 5
Is connected. In order to double-lock such a connection terminal in the housing 1, the fuse retainer 3 is inserted in a state of being stabbed from the side wall of the housing 1. The fuse retainer 3 is, as shown in FIG.
Three flat retainer pieces 3b project in parallel from the base 3a, and each tip is a free end. Strictly speaking, the central retainer piece 3b of the three is a foot plate member, and the two retainer pieces 3b, 3b on both sides thereof are members having the original double locking. [0005] In order to insert the fuse retainer 3 having such a shape, three retainer pieces 3 are provided on the side wall of the housing 1.
A slit-shaped retainer piece insertion port 2a is provided in a vertically long shape with a shape and an interval corresponding to b. Incidentally, the conventional terminal locking structure has the following points to be improved. FIG. 6 (a),
(B) is a top view showing the form before and after inserting the fuse retainer 3 into the housing 1 from the lateral direction, respectively. As shown in FIG. 3A, since most of the fuse retainers 3 are resin molded products, it is difficult for the two retainer pieces 3b on both sides to be perpendicular to the base 3a in particular due to material shrinkage during molding. . That is, the width dimension W of the base 3a
In contrast, the two outer retainer pieces 3b bend inwardly and warp, and have a narrow dimension w.
For this reason, as shown in FIG. 2B, the retainer piece 3b cannot be smoothly inserted into the retainer piece insertion opening 2a provided on the housing 1 side, which hinders the work. The above-mentioned problem of warpage of the fuse retainer 3 is unavoidable to some extent due to mold molding. 7-14
There is a technique described in Japanese Patent No. 2112. In this case, a guide groove or a guide member for forcibly correcting the warp is provided around the insertion port on the housing side, assuming the warp of the retainer piece in advance. [0008] However, in the case of the prior art described in the above-mentioned publication, setting the depth of the guide groove becomes a problem. If the guide groove is provided at an incomplete depth, the retainer will be removed from the guide groove. There is a problem that the piece is easily detached and deviates. In addition, as for the guide member, the guide member is detachable with respect to the insertion opening of the housing,
In order to only achieve the initial purpose of correcting the warpage of the retainer piece, there is a problem that the structure becomes very complicated and the cost is increased. As shown in FIGS. 7 (a) and 7 (b), the housing 1 is generally a resin-molded product like a fuse retainer, as in the case of the fuse retainer. There is a situation in which a punching hole 6 must be provided in the vicinity. Therefore, preventing the waterproofness and dustproofness of the housing from being impaired by the mold release hole 6 is also an important improvement. In many other prior arts, including the prior art of the above-mentioned publication, although the initial purpose of a straightening guide by warpage of a fuse retainer is achieved to some extent, there is another problem to be solved, namely, the use of a punching hole. No consideration is given to improving waterproofness and dustproofness. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate problems such as a decrease in insertion workability due to warpage of a fuse retainer of a resin molded product, and at the same time, to a problem with respect to waterproofness and dustproofness due to a mold release hole on a housing side. It is another object of the present invention to provide a terminal locking structure in which the problem is solved. According to a first aspect of the present invention, there is provided a terminal locking structure for connecting a plurality of connection terminals housed in a housing of a resin molded product of a fuse box to the housing. A plurality of slit-shaped retainer piece insertion openings provided in the resin molded product terminal retaining retainer is inserted and locked to prevent removal,
A side wall of the housing has a guide slope facing the retainer piece insertion opening, and a flat section trapezoidal warp correction table is integrally provided. One of the terminal holding retainers has a portion facing the guide slope. And a closed cover portion that accommodates and covers the entirety of the warp correction table, and a plurality of flat retainer pieces that are continuous with the facing portion and guided by the guide slope to the retainer piece insertion port are provided. Has become. With the above construction, even when the two flat retainer pieces on both sides of the terminal holding retainer are warped due to the material shrinkage at the time of molding, the guide slope of the warp correcting table on the housing side is inserted at the time of insertion. It is guided while the warp is being corrected, and can be smoothly inserted into the corresponding retainer piece insertion opening. At the same time as the insertion, the warp correcting table is covered and closed by the closing cover portion on the terminal holding retainer side. Thereby,
A water component or dust is prevented from entering the vicinity of the retainer piece insertion opening, that is, from a mold release hole formed in the warp correction table. Since the flat retainer piece is continuous with the portion facing the guide slope, the angle between the flat retainer piece and the portion facing the guide slope increases. Therefore, it is effective to prevent the flat retainer piece from being pulled by the closing cover portion and warped inward due to material shrinkage during molding. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a terminal locking structure according to the present invention is applied to a fuse box will be described below in detail with reference to FIGS. As shown in an exploded perspective view of FIG. 1, a plurality of sets of fuses 18 and fuse terminals 19 are connected inside a housing 11 of a fuse box 10 as in FIG. A fuse retainer (terminal retainer) 20 is inserted from the side wall of the housing 11 so as to be double-locked in the housing 11 to prevent the connection terminal from being pulled out. As shown in FIGS. 2 (a) and 2 (b), the fuse retainer 20 has a closed cover portion 21 having an internal cavity at one end as a resin molded product by a mold as shown in FIGS. Is provided. The base 2 near this
2 are provided integrally. A flat retainer piece 23 serving as a foot plate protrudes from the base 22 and extends with its tip as a free end. The flat retainer piece 23 faces guide slopes 16a and 16b described later from both ends of the closing cover 21 specifically. The two flat retainer pieces 24 and 25 protrude in parallel with the center foot plate flat retainer piece 23 from the corresponding portions, and are provided with their respective tips being free ends. The two flat retainer pieces 24, 2 on both sides that are continuous with the facing portion of the closing cover portion 21.
Reference numeral 5 denotes a member having an original terminal double locking function. On the other hand, in the housing 11, the slit-shaped retainer piece insertion openings 13, 14, 15 are provided on the side wall of the housing 11 at a shape and an interval corresponding to the three flat retainer pieces 23, 24, 25. . In addition, a flat trapezoidal warp correcting table 16 is provided at the front of each insertion opening. Both side surfaces of the rising side wall of the warp correction table 16 are formed as guide inclined surfaces 16a and 16b facing the two retainer piece insertion openings 13 and 15 on both sides.
In addition, the upper end of the warp correction table 16 is provided with a mold release hole 16c.
It is opened as. Here, the closing cover 21 provided on the fuse retainer 20 has a warp correcting table 16 in its internal cavity.
Is formed in a size and a shape capable of completely accommodating the whole. Therefore, after insertion and assembly of the fuse retainer 20,
The closing cover portion 21 can completely close the mold release hole 16c provided as the upper end opening of the warp correction table 16 from above. Next, FIGS. 3A to 3D are plan views.
4 (a) and 4 (b) which are front sectional views, the operation and operation of the terminal locking structure according to the present embodiment having the above configuration will be described. Before inserting the fuse retainer 20 into the housing 11, the fuse 1
8 and a fuse terminal 19 are connected. First, as shown in FIG. 3 (a), three flat retainer pieces 23, 24, 25 of the fuse retainer 20 are inserted into retainer piece insertion ports 13, 14, 15 of the housing 11.
Face. At this time, due to the material shrinkage during the molding of the fuse retainer 20, two flat retainer pieces 24,
25 may be warped inward and become narrower in width. As shown in FIG. 3B, when the warped fuse retainer 20 is inserted as it is,
The two flat retainer pieces 24, 25 are provided on both sides of the guide slopes 16a, 16b in the warp correction table 16 on the housing 11 side.
You will be guided in contact with. Fig. 3
As shown in (c) and (d), the central flat retainer piece 2
3 is inserted into the retainer piece insertion opening 14 without any problem, and the two flat retainer pieces 24 and 25 on both sides can also be smoothly inserted into the retainer piece insertion ports 13 and 15. As shown in FIGS. 4 (a) and 4 (b), when the inserted fuse retainer 20 is completely inserted into the housing 11, the upper end mold release hole 16c of the warp correcting table 16 on the housing 11 side. Is completely closed from above by the closing cover 21 on the fuse retainer 20 side [FIG.
(See (b)). Thus, even when the fuse box 10 is mounted on an actual machine, it is possible to prevent water components and dust from entering through the mold release hole 16c, and to maintain required waterproofness and dustproofness. In the above, the operation mode and the operation have been described on the assumption that the two flat retainer pieces 24 and 25 on both sides are warped inward due to material shrinkage during molding. However, as shown in FIG. 2A, the fuse retainer 20 of the present embodiment has the flat retainer pieces 24, 2 on both sides.
5 is continuous with the portion facing the guide slope, the angle between the portion and the portion facing the guide slope is large (obtuse angle α °). Therefore, in practice, the flat retainer pieces 24 and 25 are pulled by the closing cover part 21 due to the material shrinkage during molding, and inward, in other words, the central flat retainer piece 23.
Warping to the side is suppressed. As described above, the terminal locking structure according to the present invention is particularly advantageous when applied to a fuse box, and warpage deformation occurs due to material shrinkage during molding of a fuse retainer of a resin molded product. Can be inserted and mounted smoothly into the fuse terminal housing side housing, and because it is a resin molded product, it is necessary to provide a die release hole for the mold, but at the same time as inserting and mounting the fuse retainer. Since the structure is such that the die hole is closed, it is effective in maintaining the required waterproofness and dustproofness.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view including an enlarged main part of a fuse box shown as an embodiment of a terminal locking structure according to the present invention. FIGS. 2A and 2B are a plan view and a side view showing a fuse retainer alone according to the present embodiment. FIGS. 3A to 3D are plan views sequentially showing an operation of inserting and assembling a fuse retainer according to the present embodiment. FIGS. 4A and 4B are cross-sectional side views showing a state in which a mold release hole is closed before and after insertion of a fuse retainer according to the present embodiment. FIG. 5 is an exploded perspective view showing a fuse box shown as a conventional example of a terminal locking structure. FIGS. 6A and 6B are plan views sequentially showing a conventional fuse retainer insertion and assembly operation. FIGS. 7 (a) and 7 (b) are a front view and a side sectional view showing a conventional housing structure. DESCRIPTION OF SYMBOLS 10 Fuse box 11 Housing 13, 14, 15 Retainer piece insertion opening 16 Warp straightening table 16 a, 16 b Guide slope 16 c Mold removal hole 20 Fuse retainer (retainer for terminal holding) 21 Closed cover part 22 Base part 23 Flat retainer Piece (foot plate) 24, 25 Flat retainer piece

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Claims (1)

(57) [Claim 1] A plurality of connection terminals accommodated in a housing of a resin molded product of a fuse box are connected to a plurality of slit-shaped retainer piece insertion ports provided in the housing. A terminal locking structure for preventing removal by inserting and locking a terminal retainer of a resin molded product, wherein the side wall of the housing has a guide inclined surface facing the retainer piece insertion opening and has a flat cross section. A trapezoidal warp correction table is integrally provided, and one of the terminal holding retainers has a portion facing the guide slope and covers and covers the entire warp correction table. A terminal locking structure, comprising a plurality of flat retainer pieces that are continuous with the facing part and are guided by the guide slope into the retainer piece insertion opening.