JPH0362429A - Manufacture of small glass tube fuse - Google Patents

Abstract

PURPOSE:To ensure proper prearcing time-current and operating characteristics by applying the constitution wherein a fusible wire is inserted in a small hole formed via the processing of an outer cylinder glass tube ends from the outside, and the small hole is sealed and then crowned with a metal terminal cap. CONSTITUTION:Both ends 1 of a glass tube A are locally heated and bent, and the inner diameter thereof is so formed as to have a small hole 2 approximately sized to allow the insertion of a fusible wire 3. Furthermore, the fusible wire 3 is inserted through the hole 2 and this hole 2 is sealed at both ends of the wire 3 by means of a heat resisting adhesive 5. Thereafter, both ends 4 of the wire 3 are projected 2 to 3mm outward and bent. Both ends of the glass tube A so formed are fitted with a metal terminal cap 6. Namely, a solder piece and an adhesive 7 are placed in the metal terminal cap 6, and heated to fuse the solder piece. The cap 6 is thereby fitted to both ends of the tube A and a small glass tube fuse is formed.

Description

[Detailed description of the invention] (Industrial application field) 2゜ b.

3゜1゜The present invention relates to a method for attaching a fusible fuse wire to a glass tube of a small glass tube fuse (prior art) There are two conventional methods for attaching a fusible wire for a small glass tube fuse to a glass tube. Yes, part 1 is to attach a metal terminal with a hole at the bottom to the end of the glass tube with adhesive, insert a fusible fuse wire through the bottom hole of this metal terminal, and thread it through the metal terminal on the other side by about 2 cm. Protrude and bend the metal terminal hole and solder it so as to seal it, and while stretching this fusible wire, fold it back to the hole of the metal terminal, and seal the fuse fusible wire and the metal terminal hole with solder to manufacture. It's a method.

The second method involves inserting a fusible wire into a glass tube, protruding about 5 mm from the opposite end, bending it, placing solder and adhesive inside the metal terminal, heating it to melt it, and attaching it to the cap.Then, this fusible wire is stretched diagonally. In this method, the wire is folded back to the edge of the glass, a metal terminal is attached to the cap, and the fusible wire protruding from the metal terminal is cut.

(Problem to be solved by the invention) However, in the manufacturing method of 1, since the fuse fusible wire is inserted into the metal terminal, this solder adheres to the fusible wire and enters the inside of the glass tube, resulting in uniformity in the length of the fuse fusible wire. This has the disadvantage that the fusing characteristics of the fuse change. Another disadvantage is that flux during soldering enters the glass tube, adheres to the fusible wire and the tube wall, and gasifies when shutting off, leading to destruction of the glass tube.

In manufacturing method 2, when a glass tube with a fusible wire passed through it is inserted into a metal terminal and attached, the solder melted due to heating inside the metal terminal may become uneven due to whether it melts in a convex or concave shape.
There is a drawback that the length of the fusible wire lacks uniformity, which changes the fusing characteristics. Further, the solder part of the metal terminal is exposed inside the glass tube, and the flux during soldering adheres to the fusible wire and the tube wall and gasifies when disconnected, causing the glass tube to break.

The object of the present invention is to solve such defects in the fusing characteristics and breaking characteristics in the conventional method of connecting a fusible wire to a metal terminal by passing it through a glass tube.

(Means for Solving the Problems) The present invention was developed in order to solve the drawbacks of the conventional method of connecting fusible wires and metal terminals. A fuse is made by heating the inside diameter of the glass tube to form a small hole large enough to allow the fusible wire to pass through, passing the fusible wire through the glass tube, and inserting it into the small holes at both ends of the glass tube using heat-resistant adhesive. After gluing the fusible wire to seal it, place the fusible wire 2mm-3m from the end of the glass tube.
This can be manufactured by cutting at the protruding point, bending it horizontally, then heating and melting a piece of solder and adhesive inside a metal terminal cap, and capping and connecting it to both ends of the glass tube described above. Manufacturing that keeps the length of the molten wire constant, prevents solder flux from entering the inside of the glass tube, improves the fusing characteristics and breaking characteristics, and eliminates the destruction of the glass tube when cutting. The present invention provides a method.

(Function) In the method of the present invention, both ends of the outer glass tube are made with small holes large enough for the fusible wire of the fuse to pass through, and after the fusible wire is passed through, the small holes are sealed with a heat-resistant adhesive and then cut. ,
By manufacturing this by putting solder and adhesive inside and connecting it with a heated and melted metal terminal, it is possible to prevent solder and flux from entering the glass tube, increase the uniformity of the glass tube fuse, and improve quality. did it.

(Example) The manufacturing method of a small glass tube fuse of the present invention will be explained step by step with reference to the accompanying drawings. FIG. 1 is a sectional view of an outer glass tube A, and both ends (1) of this glass tube A are The end of the glass tube A (1) is heated locally and bent.
The small hole (2) is formed to have an inner diameter that allows the fuse-fusible wire (3) to be inserted therethrough. (See Figure 2) And this small hole (
2) Insert a fusible wire into the fuselable wire (3) and seal the small hole (2) at both ends of the fusible wire (3) with a heat-resistant adhesive (5). After that, connect both ends (4) of the fuse fusible wire (3) to 2 to 3 mm.
Point &1 (4) shown in diagram vJ3 by protruding outward
). Metal terminal caps (6) are attached to both ends of the glass tube A formed in this way, and solder pieces and adhesive (7) are placed inside the metal terminal cap (6).
) and heated to melt the solder pieces and attach them to both ends of the glass tube to form the small glass tube fuse of the present invention.

(Effects of the Invention) The small glass tube fuse of the present invention can be melted from the outside into the small hole (2) formed by processing the end of the outer glass tube A as described above! (3), seal this small hole (2), and then cap it with a metal terminal cap (6), so there is no adhesive or solder flux inside the glass tube A.
゜No contamination occurs, and if the length of the glass tube is constant, the length of the fuse fusible wire will also be constant, so it can reliably handle the charging current without disturbing the fusing and breaking characteristics of the fusible wire. Furthermore, since no impurities are mixed into the glass tube, damage to the equipment can also be prevented since the fuse tube is prevented from being destroyed due to gasification of impurities when shutting off.

[Brief explanation of drawings]

The figures explain the manufacturing process of the method of the present invention step by step. Figure 1 is a cross-sectional view of a glass tube, Figure 2 is a cross-sectional view showing the processing of the glass tube, and Figure 3 is a cross-sectional view of the glass tube. FIG. 4 shows a cross-sectional view of a small glass tube fuse manufactured by the manufacturing method of the present invention. 8 - Outer glass tube (1) □ End of glass tube (2) □ Small hole □ Fuse Fusible wire 10)' □ Cutting part of fusible wire □ Heat-resistant adhesive to seal the small hole - Metal terminal cap □ Solder and glue

Claims (1)

[Scope of Claims] a. A step of locally heating both ends of the outer glass tube and forming the inner diameter of the end of the glass tube into a small hole large enough to allow the fusible wire to pass through. b. A step of inserting the fusible wire into the glass tube through the small hole and sealing the small hole with a heat-resistant adhesive. c. Cutting and bending the bonded fusible wire so that it slightly protrudes from the end of the glass tube. d. A step of putting solder and adhesive inside the metal terminal cap, heating and melting it, and capping both ends of the glass tube to seal both ends of the glass. A method of manufacturing a small glass tube fuse according to the steps a to d above.