JPH05250975A - Manufacture of fuse with pawl - Google Patents

Abstract

PURPOSE:To realize soldering with an alloy fixed in a predetermined position so as to prevent misalignment, falling-off or the like and facilitate automation of a production line by using a solder having a shape almost resembling the letter H viewed in plan. CONSTITUTION:In securing an alloy 5 having a low melting point to a bridge core of a fuse base 4 by soldering, the bridge core is fitted into a fitting groove 6 formed on the alloy 5 so that the upper surface of the alloy 4 is tightened under pressure. In a solder 8 having a shape almost resembling the letter H viewed in plan, an intermediate connecting portion 8a thereof is mounted on the bridge core, to be secured to the bridge core simultaneously with the tightening work of the upper surface of the alloy 5 under pressure. Accordingly, the solder 8 is fixed in position, thus preventing misalignment, falling-off and generation of defective products. Additionally, products can be sufficiently checked only by a random sample test because visual inspection of all products is unnecessary. Furthermore, since the solder 8 is handled as one part having an almost H-shape, an automation process is applicable and a production process can be saved in manpower.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved method of manufacturing a clawed fuse attached to a ketch holder and used for protection of a low voltage drop wire, and more particularly to a low melting point alloy fixed to a fuse-based bridge core. The present invention relates to an improvement in soldering.

[0002]

2. Description of the Related Art A fuse with a claw sandwiches a central bridge core 1 as shown in FIGS.
The fuse base 4 has a claw terminal 3 and a low melting point alloy 5 fixed to the bridge core 1 of the fuse base 4 and soldered. As a structure for fixing the low melting point alloy 5 to the bridge core 1, there are a winding method and a fitting method. The winding tightening method is a method in which a band-shaped low melting point alloy 5 having a predetermined thickness and dimensions is wound around and fixed to the bridge core 1 of the punched fuse base 4, and the fitting method is as shown in FIG. This is a method in which the bridge core 1 is fitted into the fitting groove 6 formed in the low melting point alloy 5, and the upper surface is pressed and fixed.

By the way, the low melting point alloy thus fixed is then soldered. Conventional soldering is a so-called brazing method, and two rod-shaped solders 7 of a predetermined amount are prepared. Was placed on the fuse base at the end face of the low melting point alloy, and after dropping the flux, it was sent to a tunnel type electric furnace by a conveyor for soldering.

[0004]

Since the conventional soldering is a soldering method as described above, there is a possibility that it may be displaced or dropped due to vibration when it is fed into the tunnel type electric furnace by a conveyor. , Was the cause of defective products. Therefore, all products required visual inspection. Moreover, the work of placing the rod-shaped solder had to be done manually, which was a weak point that prevented automation of the production process.

Therefore, the object of the present invention is to
A method of manufacturing a fuse with a claw that can be soldered in a fixed position without soldering, does not cause misalignment or dropout, and can adopt a soldering method that can easily automate the production process It is in the place of providing.

[0006]

In order to achieve the above object, in the present invention, the solder used is devised so that it has a substantially H-shaped planar shape.

That is, manufacture of a fuse with a claw consisting of a fuse base having a heat generating portion and claw terminals at both ends sandwiching a central bridge core and a low melting point alloy fastened and soldered to the bridge core of the fuse base. In the method, the solder to be soldered is formed into a substantially H shape in a plan view, and the intermediate connecting portion is placed on the bridge core and fixed to the bridge core together with the low melting point alloy. It is designed to be performed in a fixed state.

The low melting point alloy may be fastened to the bridge core by a winding method or a fitting method. The low melting point alloy has a substantially H-shaped planar shape so that solder can be fastened at the same time when the low melting point alloy is fastened. It is soldered. When the low melting point alloy is fixed by the fitting method, the bridge core and the intermediate connecting portion of the solder may be fitted in the fitting groove and the upper surface of the low melting point alloy may be clamped. Further, in this case, if the upper surface of the low melting point alloy is formed as an upwardly inclined surface toward the fitting groove, the pressing can be easily performed. The width of the intermediate connecting portion of the substantially H-shaped solder is set to be substantially the same as the width of the fuse-based bridge core.

[0009]

When the solder having the substantially H shape is used,
Compared to the case where two rod-shaped solders are respectively installed, they can be easily installed in a fixed position and can be incorporated in an automated process. In addition, since the solder thus installed together with the low melting point alloy is fixed to the bridge core and then the soldering process is performed, there is no displacement or dropout, and it is possible to avoid the occurrence of defective products due to this. , Visual inspection of all products may be unnecessary.

[0010]

1 is a perspective view showing an embodiment of a fuse with a claw manufactured by the manufacturing method according to the present invention, and its basic structure is the same as that shown in FIGS.

That is, sandwiching the central bridge core 1,
A fuse base 4 having a heat generating portion 2 and a claw terminal 3 at both ends, and a low melting point alloy 5 fixed to the bridge core 1 of the fuse base 4 and soldered to the bridge core 1 of the low melting point alloy 5. The low melting point alloy 5
A method is adopted in which the bridge core 1 is fitted into the fitting groove 6 formed in 1., and the upper surface of the low melting point alloy 5 is pressed and fixed.
As shown in FIG. 4, the upper surface 5a of the low melting point alloy 5 is formed as an upward slope toward the fitting groove 6 in order to facilitate this clamping. Reference numeral 8 is a solder having a substantially H-shaped planar shape used in the present invention, and when the intermediate connecting portion 8a is placed on the bridge core 1 and the upper surface of the low melting point alloy 5 is pressed, at the same time, the bridge core 1 is pressed. It is designed to be fastened to.

The following is a description of the relationship with the production process.

Fuse base 4, low melting point alloy 5 and approximately H
The manufacture of the V-shaped solder 8 is the same as that of the conventional example. That is, the fuse base 4 is stamped and formed from a material plate, and the low melting point alloy 5 is stamped and formed after rolling the alloy material to a predetermined thickness and cutting it to form the fitting groove 6. The V-shaped solder 8 is also formed by punching after rolling and cutting a predetermined material.

After each component is prepared in this manner, first, the bridge core 1 of the fuse base 4 is fitted into the fitting groove 6 of the low melting point alloy 5, and the H-shaped solder 8 is placed on the bridge core 1.
The three members are combined with the intermediate connecting portion 8a of No. 3 placed.
Then, when the inclined upper surface 5a of the low melting point alloy 5 is pressed, both the low melting point alloy 5 and the H-shaped solder 8 are fixed to the bridge core 1. In this state, the solder is placed on the conveyor, the flux is dropped, and then sent to the tunnel type electric furnace, whereupon the solder is melted at a fixed position and flows into the gap between the low melting point alloy and the fuse base to complete the soldering.

Even when the low-melting-point alloy 5 is fixed to the bridge core 1 by winding, it is the same that the soldering step is performed in the state where the low-melting alloy 5 is fixed to the bridge core 1.

[0016]

As described above, according to the method of manufacturing a fuse with a claw according to the present invention, the shape of the solder used for soldering is substantially H-shaped, and the low melting point alloy is fixed to the bridge core at the same time. Since it is possible to do so, the solder is fixed at a fixed position, there is no misalignment or dropout, it is possible to avoid the occurrence of defective products due to this, and it is not necessary to visually inspect all products, it is possible to fully check by sampling inspection I was able to do nothing. Further, since the solder can be handled as one component having a substantially H shape, it can be easily put on the automation process, and labor saving in the production process can be achieved.

Both the tightening method and the fitting method can be adopted as the fastening method of the low melting point alloy. According to the fitting method, a substantially H-shaped solder is fitted in the fitting groove of the low melting point alloy. Since the intermediate connecting portion can be fitted and held, there is an advantage that the fastening operation can be more easily performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a fuse with a claw manufactured by a manufacturing method according to the present invention,

2 is a sectional view taken along line AA in FIG.

FIG. 3 is a perspective view of a substantially H-shaped planar solder used in the present invention,

4 is a perspective view of a low melting point alloy used in the embodiment of FIG.

FIG. 5 is a perspective view showing a general structure of a fuse base,

FIG. 6 is a perspective view showing a state in which a low melting point alloy is attached to the fuse base;

FIG. 7 is a perspective view showing a conventional fuse with a pawl.

[Explanation of symbols]

1 ... Bridge core 2 ... Heating part 3 ... Claw terminal 4 ... Fuse base 5 ... Low melting point alloy 5a ...
… Upper surface 6 …… Mating groove 8 …… Approximately H-shaped solder 8a …… Intermediate connecting part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigeru Kuga 4-25 Awaji-cho, Higashi-ku, Osaka-shi, Osaka Osaka Hughes Co., Ltd. (72) Naozumi Furu-gun 4-25 Awaji-cho, Higashi-ku, Osaka, Osaka In Osaka Hughes Co., Ltd. (72) Inventor Yoshihiro Muranaka 4-25 Awaji-cho, Higashi-ku, Osaka City, Osaka Osaka Hughes Co., Ltd.

Claims (3)

[Claims] 1. A method of manufacturing a fuse with a claw comprising a fuse base having a heat generating portion and claw terminals at both ends sandwiching a central bridge core and a low melting point alloy fixed to the bridge core of the fuse base and soldered. The manufacturing of a fuse with a claw, characterized in that the solder to be soldered has a substantially H-shaped planar shape, and the intermediate connecting portion is placed on the bridge core and fixed to the bridge core together with the low melting point alloy. Method. 2. The method of manufacturing a fuse with a claw according to claim 1, wherein the low melting point alloy has a fitting groove into which the bridge core and the intermediate connecting portion of the solder are fitted, and the upper surface is clamped and fixed to the bridge core. . 3. The method for manufacturing a fuse with a claw according to claim 2, wherein the upper surface to be clamped is an inclined surface that rises toward the fitting groove.