JPH054184Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] This invention relates to an improvement in a claw-fitted fuse that is attached to a butt holder and used to protect a low-voltage lead-in line, and particularly relates to an improvement in a fuse base. [Prior Art] As is well known, a claw-type fuse includes a fuse base 1 having a central bridge core 1a sandwiched therebetween, a heat generating part 1b and a claw terminal 1c at both ends, and a low-melting point fuse base 1 that is tightly attached to the bridge core 1a of the fuse base 1. It is made of alloy. As shown in Figures 5 and 6, the conventional fuse base 1 is stamped and formed from a coiled material with a uniform thickness, and for types with a rated current of 75A or less, a Cu/Ni alloy is used. There is. [Problems to be solved by the invention] However, since the Cu-Ni alloy is expensive, the claw-fitted fuse manufactured using it also naturally has the disadvantage of being expensive. It is possible to use a relatively inexpensive Cu material, but since Cu has a low resistivity, it will be necessary to design the fuse base to be thin in order to obtain the necessary heat generation. However, the thickness of claw terminals is subject to restrictions stipulated by the Electrical Appliance and Materials Control Law, and is determined in relation to the rated current as shown in the table below.

[Means for solving problems]

In this invention, the fuse base is stamped and formed using a deformed material with different thicknesses in the width direction, and the thickness of the part corresponding to the claw terminals at both ends is the same as that of the part corresponding to the heat generating part. The fuse base is stamped and formed using a deformed material that is thicker than the thickness of the fuse base, so that the claw terminals at both ends are thicker than the heat generating part. [Function] Since the wall thickness of the claw terminals at both ends is thicker than the wall thickness of the heat generating part, commercialization is possible if this thickness meets the provisions of the Electrical Appliance and Material Control Law, and it also has sufficient mechanical strength. are doing. On the other hand, since the heat generating part becomes thinner, a predetermined amount of heat can be obtained even if a Cu material with low resistivity is used. [Example] Figures 1 and 2 show an example of the fuse base used in the claw-type fuse according to this invention.The structure is similar to the conventional example, and includes a bridge core 1a, a heat generating part 1b, It extends from the claw terminal 1c. As shown in the figure, the claw terminal 1c is made thicker than other parts, that is, the bridge core 1a and the heat generating part 1b, and as shown in Fig. 3, the thickness in the width direction is increased. It is stamped and formed using a deformed material 2 in which the thickness of the portion corresponding to the claw terminal portions at both ends is thicker than the other portions. Taking a rated current of 75A as an example, the thickness T1 of the pawl terminal 1c part is 0.5 mm, and the bridge core 1
The thickness of a and the thickness T2 of the heat generating part 1b are set to 0.3 mm, and in this example, Cu material is used. In the above example, the thickness of the claw terminal is made thicker, and the other parts have a uniform thickness that is thinner than this, but in short, the thickness of the claw terminal and the heat generating part is the problem, so the thickness of the claw terminal is made thicker. As long as the heat generating part is made thin, there are no particular limitations on the thickness of other parts. FIG. 4 shows such fuse bases having various thicknesses. [Effects of the invention] As mentioned above, the claw terminal of the claw-type fuse according to this invention is made thicker than the thickness of the heat generating part, so it is possible to comply with the provisions of the Electrical Appliances and Materials Control Law. It is possible to maintain sufficient mechanical strength of the terminal, and even using a material with low resistivity such as Cu material, it is possible to obtain a specified amount of heat, making it possible to significantly reduce costs. It is. Moreover, by using a deformed material, it is possible to easily manufacture the fuse by stamping as in the past, and it has been possible to provide a claw-fitted fuse of extremely high practical value.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the fuse with a claw according to this invention. Fig. 2 is a front view of only the fuse base, Fig. 2 is a plan view of the fuse base, and Fig. 3 is a deformed material punched from the fuse base. Perspective views of Figure 4 a-e
1 is a plan view of a fuse base showing various types of changes in thickness, and FIGS. 5 and 6 are a front view and a plan view of a conventional fuse base. 1...Fuse base, 1a...Bridge core, 1b...Heating part, 1c...Claw terminal, 2...
Unusual material.

Claims (1)

[Scope of utility model registration request] A fuse base with claws for protecting low-voltage drop-in wires with a rated current of 75A or less consists of a fuse base that sandwiches a central bridge core 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 claws is stamped and formed from a deformed Cu material with different wall thicknesses in the width direction, and the claw terminals at both ends are thicker than the heat generating part.