JPS6016018Y2 - temperature fuse - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature fuse, and more particularly to a temperature fuse in which fusible pellets are housed in a metal case.

A conventional temperature fuse of this type is constructed as shown in FIG.

That is, a fusible pellet 3 and a movable conductive plate 4 are arranged via a hold spring 5 in a metal case 2 to which a first lead wire 1 is connected, and an insulator supporting the movable conductive plate 4 and the second lead wire 6 is placed. A bushing spring 8 is disposed between the body 7 and the bushing spring 8.

In such a temperature fuse, since the soluble pellet 3 is solid as shown in FIG. 1 at room temperature, a constant distance is maintained between the soluble pellet 3 and the movable conductive plate 4, and the A movable conductive plate 4 is placed between the wire 1 and the second lead wire 6.
, a conductive path is formed through the metal case 2.

However, when the fusible pellet 3 melts due to an abnormal temperature rise, the hold spring 5 changes from a compressed state to an expanded state, so the movable conductive plate 4 moves downward in FIG. 1 due to the force of the bushing spring 8. It is separated from the second lead wire 6 and the conductive path is cut off.

By the way, in the process of manufacturing such a temperature fuse, first the metal case 2 and the first lead wire 1 are connected.

In this case, as shown in FIG. 2, a straight through hole 9 is made in the bottom of the metal case 2, and the end of the first lead wire 1 having the flange 1a is inserted into the hole 9.
The tip is caulked inside to form a flat head 1b.

However, when the connection portion between the metal case 2 and the first lead wire 1 is formed as described above, the head 1a at the tip of the 11th J-wire 1 protrudes high from the bottom of the metal case 2. The stability of the fusible pellets 3 placed in the lead wire is poor, resulting in variations in characteristics, and the periphery of the head 1b at the tip of the first lead wire is difficult to adhere to the metal case 2, so that the liquid of the fusible pellets may also leak during fusing. There was an inconvenience that this happened.

The present invention has been devised in view of these points, and provides a temperature fuse that has less variation in characteristics and is free from leakage due to soluble pellets.

The present invention will be explained below based on the drawings.

FIG. 3 is a diagram showing a main part of an embodiment of the present invention.

The temperature fuse according to the present invention has the same structure as that in FIG. 1 except for the connection between the metal case and the first lead wire.

Therefore, in FIG. 3, the same parts as in FIG. 1 are given the same reference numerals.

In Figure 3, lead wire insertion hole 1 at the bottom of metal case 2
0 is a tapered hole that widens toward the inside of the metal case.

The end portion of the first lead wire 1 is inserted into the insertion hole 10 and the tip is caulked to form a connecting portion between the first lead wire 1 and the metal case.

The caulked tip portion 1b of the first lead wire 1 has an insertion hole 1
The first lead wire 1 is firmly attached to the bottom of the metal case 2 without protruding from the bottom of the metal case 2.

As mentioned above, the temperature fuse of the present invention has the same structure as that shown in FIG. 1 except for the parts shown in FIG.

That is, in a metal case 2 to which a first lead wire 1 is connected, a fusible pellet 3, a hold spring 5, a movable conductive plate 4, a bushing spring 8, and an insulator 7 supporting a second lead wire 6 are sequentially stored and held. The periphery of the opening of the metal case 2 is brought into close contact with the periphery of the insulator 7.

As described above, in the temperature fuse of the present invention, the lead wire insertion hole at the bottom of the metal case is made into a tapered hole, the end of the first lead wire is inserted into the hole, and the tip is caulked to connect the metal case and the first lead wire. Because of this structure, the tip portion of the first lead wire hardly protrudes from the metal bottom surface, and therefore, the fusible pellet placed thereon is incorporated in a stable state, and there is little variation in characteristics such as internal resistance.

Further, the tip end portion of the first lead wire is in close contact with the inner surface of the lead wire insertion hole at the bottom of the metal case, so that there is no leakage of the soluble pellet when the melt is cut.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a conventional temperature fuse, FIG. 2 is a vertical cross-sectional view showing the main parts of this temperature fuse, and FIG. 3 is a vertical cross-sectional view showing the main parts of an embodiment of the temperature fuse according to the present invention. It is a diagram. 1... First lead wire, 2... Metal case, 3... Fusible pellet, 4... Movable conductive plate, 5...・Hold spring, 6...
...Second lead wire, 7...Insulator, 10...
...Lead wire insertion hole.

Claims (1)

[Scope of utility model registration request] A fusible pellet and a movable conductive plate are placed in a metal case with a first lead wire connected to the bottom via a hold spring, and a bushing spring is placed between the movable conductive plate and an insulator supporting the second lead wire. In a temperature fuse formed by placing the opening rim of a metal case in close contact with the insulator, the lead wire insertion hole at the bottom of the metal case is made into a tapered hole that expands inward, and the end of the first lead wire is inserted into this and the tip is inserted. A temperature fuse characterized in that a connection portion between a first lead wire and a metal case is formed by caulking.