JPS6031150Y2 - small fuse - Google Patents

Description

[Detailed description of the invention] This invention relates to a small fuse, and more specifically, the link part that serves as a fusible piece and the attachment are such that a fusible piece forming member that also serves as a terminal is attached to a shape-retaining member, and this is plugged into a fuse socket. The present invention relates to a small fuse in which, when the socket is inserted, a piece of bridge material formed on the socket is engaged with the shape retaining member to prevent it from falling off due to vibration.

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 has been difficult in terms of manufacturing costs and user protection. This is not a good idea when viewed from the outside; if the cap is inadvertently touched during installation, it will get damaged, and when the fuse installation is exposed, if a tool, etc. touches it, the glass enclosure will break and become unusable. There is a drawback.

In order to solve these drawbacks, US Patent No. 39097
As described in Specification No. 67, when forming a pair of blade-type terminal pieces, 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. However, a plug-in type fuse has been proposed that is inserted into a housing that has a pair of terminal insertion holes extending inward from the other end and a space between the two insertion holes that communicates with each other.

Although this fuse has a structure sufficient to eliminate the above-mentioned conventional drawbacks, the pair of blade-type terminal pieces and the fusible piece element are formed by punching from a single sheet metal member, and then The fusible piece part is trimmed by milling etc. to form the link part, which reduces the number of man-hours required for assembly, but the processability and material utilization may be poor, and the fusible piece with a small cross-sectional area may have large terminal pieces at both ends Because of this, if you are not careful when handling it after cutting it out, it will bend, and if you repair it, it will break and become unusable. Also, if it is attached to an object that experiences a lot of vibration, such as a motorcycle, it will have to be pulled out from the fuse socket. There is a drawback in that contact resistance with the terminal piece increases due to leakage, heat generation occurs, and the fusible piece part melts even at a current below the rated current.

This invention aims to eliminate the above-mentioned drawbacks, and its characteristics are that a link section is provided approximately at the center of the inverted U-shaped metal piece, and both sides of this link section are extended. a fusible piece forming member shaped like a pair of terminal parts, a fusible piece shape retaining member provided with a terminal insertion hole and a locking protrusion that engages with a locking hole formed in the terminal part; The present invention provides a small-sized fuse that can be prevented from coming off due to vibration, and is provided with a female-type lip socket for joining and a fuse socket having a fitting protrusion that engages with a locking step provided on the shape-retaining member.

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

The small fuse F of this invention generally includes a fusible piece forming member 1, a fusible piece shape retaining member 2 that maintains the shape of the fusible piece forming member, and a female type that connects with terminal portions 13 formed at both ends of the fusible piece forming member 1. The fuse socket 3 includes a lip socket 31.

As shown in FIG. 1, the fusible piece forming member 1 is made by cutting out both edges of the central part of a metal piece 11 having a low melting point such as a zinc alloy, and the remaining width is 0.
．． 8 to 1.2 into the shape of a link part 12 of about the same size as a wire, and using this link part 12 as the fusible piece forming member 1, the thickness of this part is reduced by milling to 0.05 to 0.5 A so that the current rating is, for example, 5 A. The length of the metal piece 11 is approximately 1 mm, and both ends of the metal piece 11 are curved in an inverted U shape to form a fusible piece terminal portion 13.13.

Furthermore, rectangular locking holes 14, 14 are formed slightly above the terminal portions 13.13.

The fusible piece shape-retaining member 2 that maintains the shape of the fusible piece-forming member 1 described above is made of an insulating heat-resistant synthetic resin such as phenol resin or glass fiber reinforced nylon, and has a link portion of the fusible piece-forming member 1 on the upper part. A heat dissipation through hole (or recess) 23 is provided in the center of the fusible piece attachment part 22 which has a see-through part 21 for viewing the fusible piece forming member 1 from above, and terminal parts of the fusible piece forming member 1 are provided on both sides of the through hole 23. Flat terminal insertion holes 24, 24 into which the terminal portion 13.13 is inserted and fixed are provided, and the terminal portion 13.13 is provided on the slightly lower side surface of these insertion holes.
As shown in FIG. 5, the locking holes 14, 14 provided at the upper part of the locking holes 14, 14 are in the form of locking protrusions 25, 25 that engage and prevent removal.

Therefore, the terminal portion 13 of the fusible piece forming member 1 shown in FIG.
13 is the terminal part insertion hole 2 of the fusible piece shape retaining member 2 shown in FIG.
4, 24 from above, the locking protrusions 25 and 25 will fit the terminal portion 13 and the locking protrusion 25 into the locking holes 14, 14 of the fusible piece forming member 1, as shown in FIGS. 25, and the fusible piece forming member 1 and the fusible piece shape retaining member 2 are docked and locked.

Further, on the upper surface of this fusible piece shape-retaining member 2, there are hooks 28, 28 for locking the payment protrusions 41° 41 of the lid body 4, and on the side surfaces for locking the fusible piece shape-retaining member 2 in the fuse socket 3. A pair of locking steps 33 are each provided.

As shown in FIG. 5, the fusible piece shape-retaining member 2 has a lid 4 made of a transparent material at its upper opening and is attached to the hook portion 28 of the shape-retaining member 2.
Use by attaching to and covering.

As this fastening means, storage projections 41, 41 are formed on the lid 4, and the lid 4 is fastened to the shape retaining member 2 by these projections 41, 41.

As shown in FIGS. 4 and 5, the fuse socket 3 is equipped with a female receptacle 31.31 into which a terminal portion 13.13 is fitted, and a hook faces outward on the outer surface of the socket. Payment protrusions 32, 32 are provided in a protruding manner, and a locking step 33 through which the payment protrusions 32, 32 are inserted is provided on the outer surface of the shape-retaining member 2. The piece 32 is made to be attached.

The compact fuse of this invention is constructed as described above, and as shown in FIG. When inserted, the terminal portion 13.13 and the female receptacle 31°31 are electrically connected, and
The payment protrusions 32, 32 and the locking steps 33, 33 are mechanically engaged between the fusible piece shape retaining member 2, which mechanically holds the fusible piece forming member 1 including the terminal portion, and the fuse socket 3. Even if large vibrations are applied, small fuses will not come off or pull out compared to fuse sockets.

In the above embodiment, the hook portions 32A, 32A of the payment protrusions 32, 32 protruding from the fuse socket 3 are provided so as to project outward, and the outward hook portions 32A, 32A
In this example, the hooks 3 of the payment protrusions 32, 32 are respectively engaged with the locking steps 33, 33 of the fusible piece shape-retaining member 2.
2A and 32A may be formed so that their protrusions are directed inward to the fuse socket 3, and these inward hooks may be engaged with recess steps formed in the side surface of the fusible piece shape-retaining member 2.

As described above, this invention consists of a fusible piece forming member in which a link part is provided approximately at the center of an inverted U-shaped metal piece, and both sides of this link part are extended to form a pair of terminal parts; A fusible piece shape-retaining member is provided with a locking protrusion that engages with the formed locking hole, together with a terminal insertion hole, and a female receptacle that connects with the terminal portion, and a locking step provided on the shape-retaining member. Since it is constructed with a fuse socket that has an engaging fishing protrusion, it is safe because the fuse will not come off even if it is attached to a subject with large vibrations such as a moped bicycle or motorcycle. have

[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 Fig. 3 is a perspective view of a completed small fuse. FIG. 4 is a perspective view of the fuse socket, and FIG. 5 is an enlarged longitudinal cross-sectional view of a small fuse inserted into the fuse socket. 1... Fusible piece forming member, 2... Fusible piece shape retaining member, 3... Fuse socket, 4...
... Lid body, 11 ... Metal piece, 12 ...
・Link part, 13... Fusible piece terminal part, 14...
...Latching hole, 25...Latching protrusion, 31...
... Female receptacle, 32 ... Fishing protrusion, 33 ... Locking step.

Claims (1)

[Scope of utility model registration request] A link portion 12 is provided approximately at the center of the inverted U-shaped metal piece 11, and both ends of this link portion 12 are extended to form a pair of terminal portions 13.
A fusible piece forming member 1 having formed thereon, a fusible piece shape retaining member 2 having a locking protrusion 25 that engages with the locking hole 14 formed in the terminal portion 13 together with the terminal insertion hole 24, and the terminal portion 13
A piece protruding piece 32 that is provided with a female lip set tacle 31 that is joined to the shape-retaining member 2 and that engages with a locking step 33 provided on the shape-retaining member 2.
1. A small fuse comprising: a fuse socket 3 having a fuse socket 3;