JPS6031147Y2 - small fuse - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a small fuse, and more specifically, a link part that serves as a fusible piece and a fusible piece-type member that also serves as a mounting terminal are attached to a shape-retaining member and this is then plugged into a fuse socket. The present invention relates to a small fuse in which a piece of bridge material shaped like the shape-retaining member is engaged with the socket 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 reduces manufacturing costs and protects the user. From a point of view, this is not a good idea; if the cap is inadvertently touched during installation, it will cause a shock, 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 that it can be stored away.

In order to solve these drawbacks, US Patent No. 39097
As shown 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. A plug-in type fuse has been proposed which is inserted into a housing which 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, 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 man-hours required for assembly can be reduced by trimming the parts by milling etc. and forming the link parts, the processability and material utilization rate are poor, and moreover, large terminal pieces are attached to both ends of the fusible piece with a small cross-sectional area. If you don't handle it carefully after removing it, it will bend, and if you fix it, it will break and become unusable.
If the fuse is attached to an object that experiences high vibrations, such as a motorcycle, it may come out of the fuse socket or come off, resulting in increased contact resistance with the terminal piece, which generates heat and causes the fusible piece to melt even at a current below the rated current. There was a drawback.

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 in which a pair of terminal portions are formed; a fusible piece shape retaining member having a locking recess formed in the terminal portion that fits into the locking protrusion 7:5, together with a terminal insertion hole; To provide a small-sized fuse with a mechanism for preventing detachment due to vibration, comprising a female receptacle that connects with a terminal part and a fuse socket that has a locking step that engages a piece of bridge material connected to the shape-retaining member. It is something.

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 that connects with fusible piece terminal portions 13 formed at both ends of the fusible piece forming member 1. It consists of a fuse socket 3 equipped with a type receptacle 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.
．． A link part 12 of about 8 to 1.2 mm is formed, and the link part 12 is used as the fusible piece forming member 1, and the thickness of this part is reduced to 0.05 to 0.0 mm by milling so that the current rating is, for example, 5 A. ITrr! jX, and both ends of the metal piece 11 are curved into an inverted U shape, to form a fusible piece terminal portion 13.13 having a stepped portion 15.15.

Also, a locking protrusion 14 is located slightly above the terminal portion 13.13.
．． 14 is in full form.

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 13 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 parts 13.13 are inserted and fixed are provided, and the terminal parts 13.13
As shown in FIG. 5, the locking protrusions 14, 14 provided on the upper part of the holder are in the form of locking recesses 25, 25 for engaging and locking in and out.

Therefore, the terminal portion 13.13 of the fusible piece forming member 1 shown in FIG.
The terminal insertion hole 24 of the fusible piece shape retaining member 2 shown in FIG.
24 from above, the locking projections 14, 14 of the fusible piece forming member 1 are inserted into the locking recesses 25, 25 by the terminal portion 13 and the locking projections 14, 14, as shown in FIGS. 3 and 5. It engages with the punch with elasticity, and the fusible piece forming member 1 and the fusible piece shape retaining member 2 are docked and locked.

Furthermore, hooks 28 and 28 are provided on the upper surface of the fusible piece shape-retaining member 2 for locking the piece protrusions 41 and 41 of the lid body 4, and hook portions 28 and 28 are provided on the side surface for locking the fusible piece shape-retaining member 2 in the fuse socket 3. A pair of piece protrusions 29, 29 are provided, respectively.

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, piece projecting pieces 41, 41 are formed on the lid 4, and the lid 4 is fastened to the shape retaining member 2 by these projecting pieces 41, 41.

As shown in FIGS. 4 and 5, the fuse socket 3 is equipped with a female receptacle 31.31 into which the terminal portion 13.13 is fitted, and a hook faces outward on the outer surface of the socket. The locking step portions 33, 33 through which the piece protrusions 29, 29 are inserted are stretched, and the piece protrusion 29 is engaged with the locking step portions.

The compact fuse of this invention is constructed as described above, and as shown in FIG. When inserted, the fusible piece terminal parts 13, 13
and the female receptacle 31, 31 are electrically connected to each other, and the fuse socket 3 and the fusible piece shape-retaining member 2 which mechanically holds the fusible piece forming member 1 including the terminal portion are connected to the bridge protrusions 29, 29. and the locking step portions 33, 33 are mechanically engaged with each other, and even if large vibrations are applied, the fuse, which is smaller than the fuse socket, will not be pulled out or removed.

In the above embodiment, the hook portions 29A, 29A of the piece protrusions 29, 29 protruding from the fusible piece shape retaining member 2 are provided so as to project outward, and the outward hook portions 29A, 29A are Although an example has been shown in which the fuse socket 3 is engaged with the engagement steps 33, 33, the hooks 2 of the bridge protrusions 29, 29 are
The protruding directions of 9A and 29A may be shaped inward to the fusible piece shape retaining member 2, and these inward hooks may be hooked to a recess stepped portion formed with a counterbore on the side surface of the fuse socket 3. .

As described above, this invention includes a fusible piece forming member in which a substantially central U-shaped metal piece is provided, both sides of this link part are extended to form a pair of terminal parts, and a pair of terminal parts are formed on the terminal parts. A fusible piece shape-retaining member is provided with a locking recess into which the locking protrusion engages together with a terminal insertion hole, and a female receptacle that connects with the terminal portion and engages with a storage protrusion provided on the shape-retaining member. It is constructed with a fuse socket that has a locking step to prevent the fuse from coming off and is safe even when installed on objects with large vibrations such as mopeds and motorcycles. have

[Brief explanation of the drawing]

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 1 of a fusible piece forming member, and Fig. 3 is a perspective view of a completed product of a small fuse. Fourth
The figure 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...
...i body, 11...metal piece, 12...
・Link part, 13... Fusible piece terminal part, 14...
...Latching protrusion, 25...Latching recess, 29.
...Payment protrusion, 31...Female receptacle, 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 sides of this link portion 12 are extended to form a pair of terminal portions 1.
3, a fusible piece shape-retaining member 2 having a locking recess 25 in which the locking protrusion 14 shaped in the terminal part 13 engages together with a terminal insertion hole 24, and a fusible piece shape-retaining member 2 having the terminal part insertion hole 24 13, and a fuse socket 3 having a locking step portion 33 that engages a piece protrusion 29 attached to the shape-retaining member 2.