JP2929415B2 - Secondary short prevention structure for fuse - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing a secondary short-circuit of a fuse used in an electric circuit of an automobile or the like, and more particularly, to a structure in which each holding piece holding the fusible piece contacts each other after the fusible piece has blown. The present invention relates to an improved fuse secondary short prevention structure for preventing a secondary short.

[0002]

2. Description of the Related Art A schematic configuration of a general fuse applied to a high-density multi-pole connector for connecting a wire harness of an automobile or the like will be described with reference to FIGS. Fuse 50
Is composed of a fuse member 51 formed in a required shape, and an insulating housing 61 which incorporates the fuse member 51 therein and is detachably mounted on a high-density multi-pole connector (not shown) to enable terminal connection. Be composed.

The fuse member 51 has a pair of female terminal portions 52 facing each other, and each locking piece 53 is cut and raised upward on the non-opposing surface side of each female terminal portion 52. I have. Each of the holding pieces 54 extending upward with a relatively small width from each of the non-opposing surfaces is bent and connected to each other, and is further formed at an intermediate portion of the connection portion in accordance with the allowable fusing capacity. A fusible piece portion 55 having a small width is formed.

The housing 61 is divided by an intermediate partition 64 at the lower half of one of the inner walls facing each other to receive the female terminal portions 52, and each has an insertion opening 63 for a male terminal. A pair of terminal storage portions 62, 62 provided
And locking grooves 65 for locking the locking pieces 53 are formed respectively. Also, on the upper half side of the inner wall surface,
In the fusing chamber 66, a pair of guide grooves 67, 67 each having an inclined surface 67a at the end for guiding each locking piece 53 is formed, and a lid member 68 is provided at the upper opening. Have been.

When the fuse member 51 is incorporated into the housing 61, the locking pieces 53 of the fuse member 51 are pushed along the guide grooves 67 from the upper opening side of the housing 61 using an appropriate insertion jig or the like. Thus, the fuse member 51 is incorporated in the housing 61. That is, by pushing in this way, the pair of female terminal portions 52,
52 faces the corresponding terminal housings 62 in the correct posture.

Next, as the insertion operation progresses, each locking piece 5
3 is pressed and stored inward by each inclined surface 67a. Thereafter, when each female terminal portion 52 is received in each terminal storage portion 62, each locking piece 53 is restored from the pressed state, and is locked in each locking groove 65 to complete the assembly.

In the fuse 50 having the above configuration, each female terminal portion 52 is inserted through an insertion opening 63 into each male terminal portion protruding into a mounting portion of a high-density multipolar connector (not shown). In this state of use, when a current exceeding a permissible value flows through the corresponding circuit device, the fusible piece portion 55 is blown off by Joule heat, and the circuit is cut off to ensure the safety of the device.

[0008]

However, in the case of the above-mentioned conventional fuse 50, if it is used in a place where vibration, impact and the like are extremely severe, such as an automobile, the fusible piece portion 5 is required.
5, each support piece 54 that has lost its support due to the fusion of the fusible piece portion 55, as indicated by the two-dot chain line in FIG.
Either one of them may be bent from the base side due to vibration, impact, or the like, and this will come into contact with the other and cause a secondary short-circuit accident.

In order to prevent the occurrence of such a secondary short-circuit accident, for example, a fuse as disclosed in Japanese Utility Model Application Laid-Open No. Sho 62-169445 has been proposed. However, the structure of the secondary short prevention structure according to this fuse has a relatively complicated structure, and has problems in reliability and cost.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and it is possible to prevent the occurrence of a secondary short-circuit accident due to contact between holding pieces after fusing of a fusible piece portion with a simple structure. It is another object of the present invention to provide a structure for preventing a secondary short circuit of a fuse.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fuse in which a front end of each holding piece extending from a pair of opposing terminals is bent, and the front ends are connected by a fusible piece. the member is provided, wherein the the fuse element in the fuse constituting incorporated in a housing, the causes protrude the support piece of the pair so as to protrude from the vicinity of the bent portion of each holding piece, into the housing Incorporating fuse members
At the time of the operation, each of the support pieces is introduced from the upper inclined surface,
At the time of completion of assembling, a support for restraining and holding each of the support pieces is provided.
This can be achieved by a fuse secondary short prevention structure characterized by forming a holding groove .

[0012]

[0013]

In the secondary short prevention structure for a fuse according to the present invention, the fuse is provided so as to protrude from the vicinity of the bent portion of each holding piece.
Causes projecting the support piece of the pair, human into the housing
When mounting the fuse member, tilt each support piece upward.
From the surface and restrain each support piece when assembly is completed
The support groove is formed to hold it . Therefore,
Incorporation of fuse members into the housing
Using an insertion jig, etc., from the upper side of the housing,
When pushing the support piece along the slope of each support groove,
Each support piece is restrained and supported in each support groove . Therefore, it is easy to incorporate the fuse member into the housing.
In addition, after the fusible piece is blown, each tip may be bent at the support portion, but does not come into contact with each other, so that secondary short-circuit can be reliably prevented.

[0014]

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a fuse secondary short prevention structure according to the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing a schematic configuration of a fuse to which a secondary short prevention structure according to the present embodiment is applied, and FIG.
FIG.

As shown in FIGS. 1 and 2, the fuse 10 according to the present embodiment includes a fuse member 11 formed into a required shape,
The fuse member 11 is incorporated therein, and is detachably attached to a high-density multi-pole connector (not shown) so as to enable terminal connection.

The fuse member 11 has a pair of female terminal portions 12 facing each other, and each locking piece 13 is formed by cutting and raising each non-facing surface of each female terminal portion 12 upward. Have been. Also, from the non-opposite surface side of each female terminal portion 12, a relatively wide base portion 15 extending upward, a relatively narrow intermediate portion 16 following the base portion 15, and an upper portion of the intermediate portion 16. Each holding piece 14 is provided. Each holding piece 14
Are a pair of support pieces 17, 17 projecting in the left-right direction.
And a tip portion 19 bent inward through a bent portion 18 at the upper portion of each support piece portion 17. The front ends 19 of the holding pieces 14 are connected by a fusible piece 20 having a smaller width in accordance with the allowable fusing capacity. In addition, the protruding part 21 formed so as to protrude left and right of the one end part 19 has a function as a heat sink.

The housing 31 is divided by an intermediate partition wall 34 reaching the upper half side for receiving each female terminal portion 12 at the lower half of one of the opposed inner wall surfaces inside the rectangular tube. ing. The housing 31 has a pair of terminal storage portions 32, 32 having a male terminal insertion opening 33, and a locking groove 35 that is continuous from the lower bottom surface side for locking each locking piece 13. Is formed.

A pair of guide grooves, each having an inclined surface 37a for guiding each locking piece 13 at the time of assembling in the fusing chamber 36, are formed in the upper half of one of the opposed inner wall surfaces. 37, 37 are formed. Further, the upper half of the opposite inner wall surface is similarly inclined in the fusing chamber 36 so that the upper side is expanded in order to easily receive and introduce the left and right support pieces 17 at the time of installation. The surface 38a is formed. Further, a support groove 38 for supporting each of the support pieces 17 in the installation position in the assembled state is formed, and a lid member 39 is provided in an upper opening thereof.

In the case of this embodiment, the fuse member 11 is incorporated into the housing 31 from an upper opening side of the housing 31 using an appropriate insertion jig or the like.
1 along with each guide groove 37,
The support piece 17 of each holding piece 14 is inclined to the inclined surface 3 of each support groove 38.
Push in along 8a. Thereby, the intermediate partition 34
Each female terminal portion 12 is received in each terminal storage portion 32 electrically separated by the above, and each support piece portion 17 is restrained and supported in each support groove 38 so that a fuse is formed in the housing 31. The member 11 is incorporated.

That is, the pair of female terminal portions 12, 12 are made to face the corresponding terminal storage portions 32 in the correct posture, and the support piece portions 17 of the holding pieces 14 are made to face the respective support grooves 38. Can be Next, each locking piece 13 is introduced along each guide groove 37 and is pressed and stored inward by each inclined surface 37a. On the other hand, each support piece 17 is
8a, it is introduced into each support groove 38. Thereafter, when each female terminal portion 12 is received in each terminal storage portion 32, each locking piece 13 is restored from the pressed state, locked in each locking groove 35, and Each of the support pieces 17 is supported in 38, and the assembly is completed.

Next, the inter-terminal connection using the fuse 10 according to the present embodiment will be briefly described. Each male terminal projecting into a mounting portion of a high-density multi-pole connector (not shown) is inserted through an insertion opening 33. The female terminals 12 are used by connecting them. When a current exceeding a permissible value flows through the corresponding circuit device in this use state, the fusible piece 5
5 is blown off by Joule heat, breaking the circuit and ensuring the safety of the device.

[0023]

As described above, according to the structure for preventing a secondary short-circuit of a fuse according to the present invention, a pair of support pieces are provided so as to protrude from the vicinity of a bent portion of each holding piece, and a housing is provided. When installing fuse members inside
Each support piece is introduced from the upper inclined surface, and when assembly is completed
At each point, a support groove for restraining and holding each of the support pieces is formed.
Was . As a result, after the fusible piece is blown, the tip of the fuse may be bent at the support part, but it does not come into contact with each other. Can be prevented.
In addition, the fuse can be smoothly and easily incorporated into the housing, so that workability can be improved. Furthermore, the productivity can be improved and the cost can be reduced due to the simple prevention structure, and the size can be easily controlled in terms of the quality of the fuse, so that the yield can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a fuse which is an embodiment of a fuse secondary short prevention structure according to the present invention.

FIG. 2 is a sectional view showing a state in which a fuse is incorporated in a housing in FIG.

FIG. 3 is a perspective view showing a conventional fuse.

FIG. 4 is a sectional view showing a state in which a fuse is incorporated in a housing in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fuse 11 Fuse member 12 Female terminal part 13 Locking piece 14 Holding piece 15 Base part 16 Intermediate part 17 Supporting piece part 18 Bend part 19 Tip part 20 Fusible piece part 21 Projection part 31 Housing 32 Terminal storage part 33 Insertion opening 34 Intermediate partition 35 Lock groove 36 Fusing chamber 37 Guide groove 38 Support groove 39 Lid member

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H01H 37/76 H01H 69/02 H01H 85/00-87/00

Claims (1)

(57) [Claims] An end of each holding piece extending from a pair of opposing terminals is bent, and a fuse member is provided in which the ends are connected by a fusible piece, and the fuse member is placed in a housing. incorporated in the fuse constituting at the causes protrude the support piece of the pair so as to protrude from the vicinity of the bent portion of each holding piece, prior to the housing
When assembling the fuse member, raise each support piece.
The support pieces are introduced from the inclined surface of the
A secondary short-circuit prevention structure for a fuse, wherein a support groove for restraining and holding a portion is formed .