JPS5913735Y2 - small fuse - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a small fuse, and more specifically, it is a plug-in type in which a fusible piece forming member that is connected to a link part that serves as a fusible piece and also serves as a direct mounting terminal is attached to a shape-retaining member. It concerns a small fuse.

Conventional small fuses have metal caps attached to both ends of a cylindrical glass enclosure, and a fusible piece placed inside the glass enclosure is welded between the caps, but this reduces manufacturing costs and protects the user. This is not a good thing from a point of view, and if you touch the cap when replacing it, you will get a shock, and if the fuse mounting part is exposed and you touch it with a tool, the glass enclosure will break and become unusable. There is a drawback that it can be stored away.

In order to solve these drawbacks, US Patent No. 39097
When forming a pair of blade-type terminal pieces according to specification No. 67, a fusible piece is integrally formed with the terminal forming material between them, and the fusible piece integrated with the terminal has a gripping part at one end, and a A plug-in type fuse has been proposed that is inserted into a housing that has a pair of terminal insertion holes extending inwardly and a space between the insertion holes that communicates with both the insertion holes.

Although this fuse has a structure sufficient to eliminate the above-mentioned conventional drawbacks, a pair of blade-type terminal pieces and a fusible piece element are formed by punching from a single sheet metal member, and then the fusible piece Although the number of man-hours required for assembly can be reduced by trimming the parts by milling etc. to form the link parts, the workability and material utilization rate are poor, and the molding is difficult because large terminal pieces are attached to both ends of the fusible piece with a small cross-sectional area. If it is not handled carefully after being pulled out, it will bend and if repaired, it will break and become unusable, and the overall height will increase.

The purpose of this invention is to eliminate the above-mentioned drawbacks, and its feature is that a link portion serving as a fusible piece is provided approximately in the center of an approximately inverted U-shaped metal piece; While extending both sides to form a terminal part,
A fusible piece forming member having a locking hole provided in the metal piece, an insertion hole through which the terminal portion is inserted, and a heat-resistant fusible piece shape retaining member having a pair of locking recesses formed on the side surface of the hole. parts and
It is an object of the present invention to provide a small fuse in which the upper part of the terminal portion is provided with a locking piece on the side surface of the through hole of the shape retaining member, which locks the upper part of the terminal portion into the recess through the through hole.

This invention will be described in detail below with reference to the illustrated embodiments.

The small fuse of this invention is generally composed of a fusible piece forming member 1 and a fusible piece shape retaining member 2 that maintains the shape of the fusible piece.

As shown in FIG. 1, the fusible piece forming member 1 is made by cutting a central part of a rectangular metal piece 11 made of plated conductive metal such as iron, phosphor bronze, or brass with a notch width of 0.8 to 1 mm from both pieces. A link part 12 of about 2 mm is formed, and this link part is used as a fusible piece to reduce the thickness of this part to about 0.05 to 0.1 mm by milling so that the current rating is, for example, 5A, and a strip-shaped metal piece. 11 is curved at both ends into an inverted U shape, that is, into a medium shape to form a fusible piece terminal portion 13.13.

Also, a locking hole 14 is located slightly above the terminal portion 13.13.
．． 14 is formed.

The fusible piece shape-retaining member 2, which should maintain the middle shape of the fusible piece forming member 1, is molded from an insulating heat-resistant synthetic resin such as phenol resin or reinforced nylon with glass fibers, and has a link portion 12 of the fusible piece forming member 1 on the upper part. It consists of a fusible piece attachment part 22 having a transparent part 21 for viewing from above, and a heat dissipation through hole (or recess) 23 in the center of the fusible piece attachment part 22.
The fusible piece forming member 1 is placed on both sides of the through hole 23.
A flat insertion hole 24 into which the terminal portion 13.13 is inserted and fixed.
, 24 are transparently provided at the slightly lower part of these insertion holes, as shown in FIG. A wedge-shaped locking piece 26 having locking projections 25, 25 is provided.

Therefore, the fusible piece forming member 1 shown in FIG.
．． 13 to terminal insertion hole 24 of the shape retaining member 2 shown in FIG.
If it is inserted into the inside of 24 from above, the
As shown in FIG. 6, the locking protrusions 25° 25 are snapped into the recesses 27, 27 through the locking holes 14, 14 of the fusible piece forming member 1 by the elastic force of the locking pieces 26, thereby forming the fusible piece. The member 1 and the fusible piece shape retaining member 2 are docked and locked as shown in FIG.

In this state, the downward movement of the fusible piece forming member 1 relative to the shape retaining member 2 is prevented by the locking holes 14, 14 of the member 1 and the recess 27 of the shape retaining member 2, as shown in FIG.
The upward movement of the member 1 relative to the shape-retaining member 2 is also reliably prevented by the engagement between the locking protrusion 25 and the locking hole 14, and the horizontal movement of the member 1 relative to the shape-retaining member 2 is prevented by the insertion hole 24.2.
Blocked around 4.

Since this invention has the above-described configuration, the terminal portion 13.13 can be attached to a female receptacle 31.31 provided in a fuse box 3 installed in a vehicle, etc., as shown in FIG.
It can be used by attaching it to.

The form of the link part 12 may be made by increasing the length of the link part 12 by making it hang curved as shown by the chain line in FIG.

In addition, in order to protect the surrounding area from the scattering of molten metal due to the melting of the link part 12, a lid body 4 made of a transparent material as shown in FIG.
It is sufficient to use the hook portion 28 by hooking it over the hook portion 28.Furthermore, as this hooking means, a hooked protrusion 41 as shown by the chain line in FIG.
．． 41 may be formed on the lid body 4, and the lid body 4 may be engaged with the shape retaining member 2 by these protruding pieces 41, 41.

Further, the state of the fusible piece link portion 12 (fused, unfused) can be confirmed through the see-through portion 21 even when it is inserted into the fuse box 3, and can be confirmed from the side if it is pulled out from the fuse box 3.

Furthermore, when the lid 4 is not used, a transparent thin wall 29 may be provided in the longitudinal direction of the shape retaining member 2, as shown by the chain line in FIG.

As shown in FIG. 7a, this invention can be used by constructing a flat box-shaped shape retaining member 2A as the shape retaining member 2, and fixing a transparent plate in the upper step 2B of the shape retaining member 2. This has the effect of significantly reducing the area occupied by a large number of parallel units.

In order to remove the fuse of this invention from the fuse box 3, it can be removed without touching the fusible piece by holding and pulling the shape retaining members 2, 2A.

As mentioned above, this invention provides a link part that serves as a flexible piece at the approximate center of an approximately inverted U-shaped metal piece, and extends both sides of this link part to form a terminal part.
A fusible piece forming member having a locking hole provided in the metal piece, an insertion hole through which the terminal portion is inserted, and a heat-resistant fusible piece shape retaining member having a pair of locking recesses formed on the side surface of the hole. parts and
A locking piece that locks the upper part of the terminal part to the recess through the through hole on the side surface of the through hole of the shape retaining member, and by inserting and locking the terminal part into the flat through hole of the shape retaining member. Since a small fuse can be obtained, it is easy to process and assemble, and there is no risk of touching the fusible piece when replacing it, so there is less danger.The overall thickness and height can be made thinner, so it is easier to install a large number of fuses in parallel. It does not take up a lot of space when installed, and compared to the conventional example, material waste can be significantly reduced when punching and forming a fusible piece, which is advantageous in that it is economical.

[Brief explanation of drawings]

The figures all show examples of this invention; Fig. 1 is a perspective view of a fusible piece forming member, Fig. 2 is a perspective view of a fusible piece shape-retaining member, and Figs. 3 and 4 a and l) respectively. A longitudinal sectional view and a transverse sectional view of this invented small fuse as a completed product, FIG. 5 is a perspective view, and FIG. 6 is a sectional view during assembly.
FIG. 7a is a perspective view of a modified example having a flat shape, and FIG. 7 is a sectional view of the modified example. 1... Fusible piece forming member, 2... Fusible piece shape retaining member, 11... Metal piece, 12...
Link part, 13...Terminal part, 14...
Locking hole, 23, 24...Through hole, 25...
-Latching protrusion, 26...Latching piece.

Claims (1)

[Scope of utility model registration request] A link portion serving as a fusible piece is provided approximately at the center of the inverted U-shaped metal piece, both sides of this link portion are extended to form a terminal portion, and a locking hole is provided in the metal piece. a heat-resistant fusible piece forming member having an insertion hole through which the terminal portion is inserted, and a heat-resistant fusible piece shape-retaining member forming a pair of locking recesses on the side surface of the hole; A small fuse comprising locking pieces that are respectively provided on the side surfaces of the shaped member through the through hole and that lock into the recess through the through hole.