JPS634355Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an improvement of a claw-fitted fuse that is attached to a butt holder and used to protect a low-voltage drop-in line.

[Prior Art] As is well known, a claw-type fuse consists of a fuse base that sandwiches a bridge core in the center and has a heat generating part and claw terminals at both ends, and a low-melting point alloy that is in close contact with the bridge core of the fuse base. . In conventional fuses of this type, a low melting point alloy strip having a predetermined thickness and dimensions is wrapped around a bridge core of a stamped fuse base and soldered. Looking at this from the aspect of the manufacturing process, it is as follows. That is, first, a low melting point alloy material is rolled to a predetermined thickness, cut into strips, punched to a predetermined length (Fig. 6 A), then bent into a U-shape (Fig. 6 B), and pre-punched. After combining with the molded fuse base 1 (C in the same figure), wrapping it (D in the same figure) and pressing it to a predetermined thickness (E in the same figure), the low melting point alloy 2 and the heat generating part 1b are assembled. Flux is applied to the boundary area of the bridge core, and the desired amount of solder is placed on it and sent to a tunnel electric furnace using a conveyor to solder the boundary area, the contact area between the bridge core and the low melting point alloy, and the both ends of the bridge core. It was.

[Problem that the invention attempts to solve]

As mentioned above, the conventional claw fuse structure requires a large number of manufacturing steps and is complicated. In addition, the low melting point alloy is wrapped around it, and then flux is applied and soldered. Even if you clean it after cleaning, flux tends to remain inside and there is a risk of corrosion over time.
This required very careful production management.

Therefore, the purpose of this invention is to provide a claw-type fuse that is easy to manufacture, does not have an internal space where flux can easily remain, and can prevent corrosion without requiring special production control. It's there to do.

[Means for solving problems]

In this invention, a low melting point alloy is formed into a flat plate to be attached in close contact with the bridge core of the fuse base, this flat low melting point alloy is placed on the bridge core, and it is held in place by a stopper member provided on the fuse base side. The edges are pressed down and soldered to keep them in place.

[Effect]

Since the low melting point alloy is simply placed on the bridge core and the edge portion is pressed down with a stopper member, the manufacturing process is extremely simplified. Furthermore, since there is no internal space unlike in the case of winding, there is no risk that the flux used during soldering will remain inside, and the structure is extremely easy to manage production.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of the claw-fitted fuse according to the invention, showing a state in which a low melting point alloy 2 is attached to a fuse base 1. As is clear from FIG. 2, the fuse base 1 has a central bridge core 1a in between, and heat generating parts 1b at both ends.
It has a claw terminal 1c and a low melting point alloy 2.
is attached in close contact with the bridge core 1a. As shown in the figure, the low melting point alloy 2 according to this invention is formed by punching into a flat plate shape, and the bridge core 1
The end edge portion is pressed onto the bridge core 1a by a stop member 3 placed on the fuse base 1 and placed on the bridge core 1a.

The stop member 3 in the example shown in FIG. 1 is constituted by a cut-and-raised piece 3a shown in FIG. 2, and holds down the edge of the low melting point alloy 2 at four locations from the width direction of the bridge core. FIG. 3 shows another example of a cut-and-raised piece constituting the stopper member, in which both end edges of the low-melting point alloy 2 are held down by slightly wide cut-and-raised pieces 3b from the longitudinal direction of the bridge core. FIG. 4 shows a type in which both end edges of the low melting point alloy are similarly pressed down from the longitudinal direction of the bridge core, but similar to FIG. 2, relatively small cut pieces 3c are pressed in at four locations.

FIG. 5 shows still another embodiment, in which a perforated bent part 4 is formed in a part of the fuse base 1 located in the longitudinal direction of the bridge core, and the hole formed in this bent part is filled with a low melting point. Both edges of Alloy 2 are inserted and pressed. In any of the embodiments shown in FIGS. 1 to 5, the product is finally manufactured by applying flux and soldering.

[Effect of idea]

As mentioned above, the claw-type fuse according to this invention has a structure in which a low melting point alloy is made into a flat plate, placed on the bridge core of the fuse base, held down by a stopper provided on the fuse base side, and then soldered. Therefore, unlike the conventional wrapping structure,
It goes without saying that the manufacturing process can be extremely simplified, but since there is no internal space, there is no risk of residual flux, preventing deterioration of the fuse due to corrosion and deterioration of quality, and allowing the specified operating state to be maintained over a long period of time. This can be guaranteed. Additionally, production costs could be reduced, making it possible to provide a claw-fitted fuse with high practical value that would satisfy both users and manufacturers.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of a fuse with a tab according to this invention, FIG. 2 is a plan view of the fuse base used in the example of FIG. 1, and FIG. FIG. 4 is a perspective view of a main part showing still another embodiment, and FIG. 5 is a plan view of only the fuse base, FIG. 5 is a perspective view of a main part showing still another embodiment, and FIG. FIG. 2 is an explanatory diagram showing a conventional claw-fitted fuse along with its manufacturing process. 1...Fuse base, 1a...Bridge core, 1b...Heating part, 1c...Claw terminal, 2...
Low melting point alloy, 3... Stopping member, 3a, 3b, 3c
...Cut-and-raised piece, 4...Bent part with holes.

Claims (1)

[Claims for Utility Model Registration] (1) A fuse with claws consisting of a fuse base that sandwiches a bridge core in the center and has a heat generating part and claw terminals at both ends, and a low melting point alloy that is in close contact with the bridge core of the fuse base. A fuse with a tab, characterized in that the melting point alloy is in the form of a flat plate, and the plate-shaped low melting point alloy is pressed and soldered onto the bridge core at its end edge by a stopper member provided on the fuse base. (2) The claw-fitted fuse according to claim 1, wherein the stopper member is a cut-and-raised piece formed on a part of the fuse base and is pressed into the upper surface of the edge of the low melting point alloy. (3) Utility model registration claim Paragraph 1, in which the stopper member is a bent part with a hole formed in a part of the fuse base, and the edge of a low melting point alloy is fitted into the hole formed in the bent part. Fuse with claw as described.