JPH0447885Y2 - - 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.

[Conventional technology]

As is well known, a claw-type fuse consists of a fuse base that sandwiches a central bridge core and has a heat generating portion and claw terminals at both ends, and a low-melting point alloy that is closely attached to 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. 8 A), then bent into a U-shape (Fig. 8 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, and the desired amount of solder is placed on it and sent to a tunnel electric furnace using a conveyor, and soldering is performed at the boundary area, the contact area between the bridge core and the low melting point alloy, and the both sides 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, after wrapping a low-melting point alloy, flux is applied and soldering is performed, so even if soldering is not possible, Even after cleaning, the flux tends to remain inside, and there is a risk of corrosion over time.Therefore, there are concerns about the reliability and quality of the fuse, and for this reason, very careful production management is required. That's what I was doing.

Therefore, the purpose of this invention is to make it easy to manufacture, reduce costs related to the manufacturing process, and eliminate the internal space where flux tends to remain, preventing the risk of corrosion without requiring special production control. Therefore, it is an object of the present invention to provide a fuse with a tab that can satisfy the requirements in terms of reliability and stabilization of quality.

[Means for solving problems]

In order to achieve the above purpose, in this invention,
This is a new method of mounting between the bridge core of the fuse base and the low melting point alloy that is attached in close contact with it.A fitting groove is formed on the back side of the low melting point alloy, and the fitting groove allows the fitting to the bridge core. It is soldered in a fixed position.

[Effect]

As mentioned above, since the fixed setting of the low melting point alloy on the bridge core is only done by fitting it, it is highly workable and the manufacturing process is extremely simplified, and there is no internal space unlike when it is wound.
There is no risk of flux used during soldering remaining 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 this 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 sandwiched therebetween, 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 FIG. 3, the low melting point alloy 2 according to this invention has a fitting groove 2a formed on the back surface, and is fitted tightly to the bridge core 1a through the fitting groove 2a, and then flux is applied. It is soldered. Note that the fitting groove 2a may be formed by pressing or roll forming before punching.

FIG. 4 is a perspective view showing another embodiment, in which the same parts as in the previous embodiment are designated by the same reference numerals. As shown in FIG. 5, the low melting point alloy 3 attached to the fuse base 1 has a convex stepped portion 3 formed by stamping on the back surface.
It has a fitting groove 3a obtained as a gap between the step portions 3c, 3c continuous to the step portions 3b, 3b, and the step portions 3b, 3b.
3b has an edge shape that matches the shape of the edge 1b' of the heat generating portion 1b shown in FIG. After fitting this low melting point alloy 3 to the bridge core 1a,
As shown in FIG. 7, the stepped portions 3c, 3c are pressed, and then flux is applied and soldered as in the previous embodiment.

In this example, the entire stepped portions 3c, 3c are pressed, but it may be applied only partially. Furthermore, the means or form of forming the fitting groove is not limited to the above-mentioned examples, and can of course be appropriately selected in consideration of various conditions such as the shape of the edge of the heat generating portion.

[Effect of idea]

As mentioned above, the claw-type fuse according to this invention has a structure in which the low-melting point alloy is tightly fitted and soldered to the bridge core in the fitting groove formed on the back surface, so unlike the conventional wrap-around structure,
It goes without saying that the manufacturing process can be extremely simplified, but since there is no internal space, there is no concern that flux will remain, preventing deterioration of the fuse due to corrosion and deterioration of quality, and allowing the specified operating state to be maintained for 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 an embodiment of a fuse with a tab according to this invention, Fig. 2 is a perspective view of a fuse base used in the example of Fig. 1, and Fig. 3 is a perspective view of the fuse base used in the example of Fig. 1. 4 is a perspective view showing another embodiment, FIG. 5 is a perspective view of the low melting point alloy used in the example of FIG. 4, and FIG. 6 is a partial perspective view of the same fuse base. FIG. 7 is a sectional view taken along the line A--A in FIG. 4, and FIG. 8 is an explanatory diagram showing a conventional claw-fitted fuse along with its manufacturing process. 1... Fuse base, 1a... Bridge core, 1b... Heat generating part, 1c... Pawl terminal, 2, 3
...Low melting point alloy, 2a, 3a... Fitting groove.

Claims (1)

[Scope of utility model registration request] In a claw-fitted fuse consisting of a fuse base sandwiching a central bridge core and having a heat generating part and a claw terminal at both ends, and a low melting point alloy that is in close contact with the bridge core of the fuse base, a fitting groove is formed on the back surface of the low melting point alloy. . A fuse with a claw, characterized in that the fitting groove is tightly fitted and soldered to a bridge core.