JP3066709B2 - 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 blade type fuse in which an element having a fusible portion provided between a pair of flat metal terminals is mounted in a housing.

[0002]

2. Description of the Related Art Blade type fuses constitute a fuse element (hereinafter, referred to as "element") by providing a fusible portion between a pair of flat metal terminals (hereinafter, referred to as "terminals"). However, the fusible part and the base end side of the terminal connected to the fusible part, which is the upper end, are housed in a housing. However, the fusible part having low strength is deformed or damaged by an external force applied to the terminal. There is an easy problem.

[0003] As an example of a solution to such a problem, a device disclosed in Japanese Patent Publication No. 1-45174 will be described with reference to Figs. FIG. 6 is an exploded perspective view of a conventional fuse before being assembled, and FIG. 7 is a cross-sectional view of the conventional fuse in an assembled state. A fusible portion 5 is provided between the terminals 3a and 3b of the element 1, and the fusible portion 5 is connected to the terminals 3a and 3b.
Are electrically and structurally connected. Since the fusible part 5 is formed with a predetermined cross-sectional area, it is difficult to maintain a certain strength or more. For this reason, the girder member 7 is fixed between the terminals 3a and 3b, and the girder member 7 shares the external force applied to the fusible portion 5, thereby preventing the fusible portion 5 from being deformed by the external force.

On the other hand, a flap 11 is provided at the center of the insertion opening of the housing 9 into which the terminals 3a and 3b are inserted. One end of the flap 11 is rotatably connected to the housing 9 via a thin hinge or the like. You.

The conventional fuse 13 configured as described above
Then, when assembling the element 1 and the housing 9, the flap 11 is rotated after the base end side of the element 1 is inserted into the housing 9, so that the flap 11 is engaged with the projection 15 formed on the terminals 3 a and 3 b. As a result, a fixed state is established between the terminals 3a and 3b. Thereby, the fuse 13 is connected to the terminal 3a,
3b is held on the housing 9 side, and concentration of external force on the fusible portion 5 is prevented. Further, after the assembling, the beam 7 is punched out, and the means for preventing the fusible portion 5 from being deformed before the assembling is removed.

According to the conventional fuse 13, the external force applied to the terminals 3a and 3b is carried by the beam members 7 during the assembling, and the external force can be carried by the flap 11 after the assembling. The external force was not concentrated on the fusible portion 5, and the deformation or breakage of the fusible portion 5 due to the external force could be prevented.

[0007]

However, in the conventional fuse 13, the deformation or breakage of the fusible portion 5 at the time of assembly is prevented by providing the beam member 7 between the terminals 3a and 3b. Therefore, there is a disadvantage that the material of the girder member 7 is additionally required, and the material cost is increased. Further, the girder member 7 has to be removed after the assembly, which causes a problem that the number of working steps increases. On the other hand, after assembling, the flap 11 for preventing deformation or breakage of the fusible portion 5 must be fixed by inserting the element 1 into the housing 9 and then rotating it, which also increases the number of steps. There was a problem. The present invention has been made in view of the above circumstances, and provides a fuse that can prevent deformation and breakage of a fusible portion without increasing the material and without increasing the number of assembling steps, thereby reducing manufacturing cost and workability. It aims at improvement.

[0008]

According to a first aspect of the present invention, there is provided a fuse according to the present invention, wherein a fusible portion is provided between a pair of parallel terminals, and the fusible portion of the terminal is provided. <br/> In a fuse having a base end inserted into an insertion space of a housing, a fitting means for restricting movement of the terminal in a direction other than the insertion direction is provided along the terminal and the housing along a terminal insertion direction.
And a groove formed between the jing and the groove.
The terminal is characterized in that the terminal is configured to be inserted into the housing by the fitting means.

[0009]

When the terminal is inserted, the terminal and the housing are inserted through the fitting means, and an external force applied to the terminal at the time of insertion is carried by the fitting means, so that movement of the terminal in a direction other than the insertion direction is restricted. Thereby, the external force does not concentrate on the fusible portion.
Further, even after the terminal is assembled at a predetermined position of the housing, the external force applied to the terminal is carried by the fitting means, and the external force does not concentrate on the fusible portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a fuse according to the present invention will be described below in detail with reference to the drawings. 1 is a cross-sectional view of a fuse according to the present invention in an assembled state, FIG. 2 is a plan view of an element, FIG. 3 is a front view of the element, FIG. 4 is a cross-sectional view of a housing, and FIG. FIG. As shown in FIG. 2, a fusible portion 25 is provided between the terminals 23a and 23b of the element 21, and the fusible portion 25 electrically and structurally connects the terminals 23a and 23b. The fusible portion 25 is formed with a predetermined cross-sectional area, and the thickness thereof is about half the thickness t (see FIG. 3) of the terminals 23a and 23b.

Terminals 2a and 2b have terminals 2 on one surface.
A long groove 27 is formed in the insertion direction of 3a, 23b,
Numeral 7 runs longitudinally from the rear end of the terminals 23a and 23b (electric contact portion) to the base end. Therefore, the terminals 23a, 2
On the base end face of 3b, a groove 27 is opened in a U-shaped cross section. It is appropriate that the depth of the groove 27 is about the same (厚) · t as the thickness of the fusible portion 25 in view of the strength of the terminals 23a and 23b. The groove 27 is formed by, for example, cutting.

On the other hand, as shown in FIG. 4, terminals 23a and 23 are provided inside a housing 31 formed of a resin material or the like.
An insertion space 33 into which the base end side of b and the fusible portion 25 are inserted is formed. This insertion space 33 becomes an element insertion opening 35 and opens on the lower surface of the housing 31. Insertion space 33
Is formed with a pair of rail-shaped projections (hereinafter, referred to as “projections”) 37 extending in the depth direction from the element insertion opening 35, and the projections 37 are used when the terminals 23a and 23b are inserted.
The groove 23b is fitted into the groove 27b.

The groove 27 and the projection 37 are fitted to such an extent that the sliding does not become difficult. Therefore, the protrusion 37 is formed through the groove 27.
The movement of the terminals 23a and 23b inserted in the direction of approach / separation is restricted. That is, the terminals 23a, 23
The external force applied to b is carried by the fitting means of the groove 27 and the protrusion 37. The movement of the terminals 23a and 23b in the direction perpendicular to the front and back surfaces is performed by the insertion space 33 formed substantially the same as the thickness t of the terminals 23a and 23b.
The front and back surfaces of 3a and 23b are in a sandwiched state, and are naturally regulated.

As long as the length of the groove 27 and the protrusion 37 is within the range of the design resistance of the fusible portion 25 and the mold of the housing 31, the longer the length, the greater the effect of the supporting structure. . As means for fixing the element 21 and the housing 31, for example, terminals 23a, 23
b at the base end of the housing 3
1 is provided in the insertion space 33 of the housing 31 so that the terminals 23a and 23b are connected to the housing 31 by engaging the locking holes 39 with the locking projections 41. May be fixed at a predetermined position.

The operation of the fuse 43 having the element 21 and the housing 31 configured as described above will be described.
When the element 21 is inserted, the grooves 27 of the terminals 23a and 23b
Are aligned with the protrusions 37 of the element insertion opening 35, and the grooves 2
When the element 21 is inserted by fitting the protrusion 7 into the projection 37, an external force applied to the terminals 23a and 23b at the time of insertion (for example, an external force in the approach direction sandwiching the tips of the terminals 23a and 23b from the outside, arrow a) is generated. The external force is not concentrated on the fusible portion 25 by being carried by the fitting means and restricting the movement of the terminals 23a and 23b in the approaching direction.

If there is no fitting means, the terminals 23a,
When an external force in the approaching direction acts on the tip of 3b, the fusible portion 25
However, in the case where this fitting means is provided, the movement of the terminals 23a and 23b in directions other than the insertion direction is restricted, so that No stress is generated in the portion 25.

Even when the terminals 23a and 23b are inserted to a predetermined position and the locking holes 39 are engaged with the locking projections 41 and are assembled so that they cannot be removed, the terminals 23a and 23b are not removed.
The external force applied to b is carried by the fitting means, and the external force is not concentrated on the fusible portion 25.

As described above, according to the fuse 43 described above, the grooves 27 are formed in the terminals 23a and 23b, while the projections 37 are provided on the housing 31, and the terminals 23a and 23b are fitted by the fitting means of the grooves 27 and the projections 37. Since the external force applied to the 23b is carried, the concentration of the external force on the fusible portion 25 can be eliminated, and the terminal 23a, 23b can be provided without an extra member (for example, the beam member 7). And a special member for fixing (for example, flap 11)
Is not provided in the housing 31, the deformation and breakage of the fusible portion 25 can be prevented. Also, when assembling,
Special man-hours for fixing other than the insertion step (for example, removal of the girder member 7 and rotation of the flap 11) do not occur at all, and the assembling can be performed with a small number of man-hours, thereby significantly improving workability. Will be done.

In the above embodiment, the case where the groove 27 is formed by cutting has been described as an example.
The recesses having the same action as the grooves 27 are formed in the terminals 23a,
3b is not limited to the one formed by cutting. For example, as another example of forming such a concave portion, by roll forming or the like,
It is conceivable that predetermined portions of the terminals 23a and 23b are formed in a U-shaped or V-shaped cross section. With such a structure, the workability of the terminals 23a and 23b can be improved.

In the above embodiment, the terminals 23a,
The groove 27 was formed by cutting one surface of 3b,
In order to form the above-mentioned fitting means, a slit (thin notch) may be formed instead of the groove 27. Groove 2
In the case where a slit is formed instead of 7, the projection 37 is naturally formed into a shape that fits into this slit. However, in this case, the condition is that the slit is set with a width dimension and a position that do not affect the design resistance value of the element 21.

As described above, the fuse 43 of the present invention
It includes one formed by various grooves and projections, in other words, any one having a fitting means movable only in the insertion direction may be used. Therefore, the groove 43 is formed in the housing 31 in a manner opposite to that of the present embodiment.
And the protrusions 37 may be formed on the terminals 23a and 23b.

[0022]

As described above in detail, according to the fuse of the present invention, the terminal is provided so as to be fitted into the housing by the fitting means for restricting the movement of the terminal in a direction other than the insertion direction. Since the external force applied to the terminal is carried, the concentration of the external force on the fusible part is eliminated, and the terminal,
Deformation and breakage of the fusible portion can be prevented without providing a special member to the housing. As a result, the manufacturing cost can be reduced, and the workability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fuse according to the present invention in an assembled state.

FIG. 2 is a plan view of an element.

FIG. 3 is a front view of the element.

FIG. 4 is a sectional view of a housing.

FIG. 5 is a front view of the housing as viewed from an element insertion opening side.

FIG. 6 is an exploded perspective view of a conventional fuse before assembly.

FIG. 7 is a sectional view of a conventional fuse in an assembled state.

[Explanation of symbols]

 23a, 23b Terminal 25 Soluble part 27 Groove (fitting means) 31 Housing 33 Insertion space 37 Projection (fitting means) 43 Fuse

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshiharu Kudo 206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture Inside Yazaki Parts Co., Ltd. (56) References JP-A-5-205608 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 85/00-87/00

Claims (2)

(57) [Claims] 1. A fuse in which a fusible portion is provided between a pair of parallel terminals, and a base end of the terminal where the fusible portion is provided is inserted into an insertion space of a housing. The fitting means that regulates movement other than
Between the terminal and the housing along the terminal insertion direction
Consisting of a groove formed over and a projection fitted into the groove
The fuse is provided so that the terminal can be inserted into the housing by the fitting means. Grooves of wherein the insertion direction is formed in the terminal, according to claim 1, projections for groove mates to regulate the movement of other than the insertion direction, characterized in that formed in the insertion space of the housing Fuse as described.