JPS6031148Y2 - 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 fishing protrusion 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 in 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 the specification of 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 which is inserted into a housing having a pair of terminal insertion holes extending inward from the other end and a space between the insertion holes that communicates with both 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 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 are poor, and large terminal pieces are attached to both ends of the fusible piece, which has a small cross-sectional area. If you don't handle it carefully after cutting it, it will bend, and if you fix it, it will break and become unusable.
If the fuse is attached to an object that generates large vibrations, such as a motorcycle, the contact resistance between the fuse socket and the terminal piece increases, causing heat generation and the fusible piece melting even when the current is below the rated current. There was a drawback that it could be stored away.

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 part shaped like a pair of terminal parts, a fusible piece shape retaining member having a locking recess with which a locking protrusion formed in the terminal part is engaged, together with a terminal part insertion hole, and the terminal part. To provide a small fuse with a mechanism for preventing detachment due to vibration, comprising a female receptacle that connects with the shape retaining member, and a fuse socket having a buttoned protrusion that engages with a locking step provided on the shape retaining member. It is.

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 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 plated conductive metal piece 11 such as iron, phosphor bronze, or brass, and the remaining width is 0.8 to 1.277 EIl. The thickness of this part and milling are determined to be 0.05~0. .1rIrlt, and both ends of the metal piece 11 are curved in an inverted U-shape to form a fusible piece terminal portion 13.13 having a stepped portion 15.15.

Furthermore, locking protrusions 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 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 which are engaged and prevented from being removed.

Therefore, the terminal portion 13 of the fusible piece forming member 1 shown in FIG.
Terminal insertion hole 24 of 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, as shown in FIGS. The elasticity caused by this snaps them into place, and the fusible piece forming member 1 and the fusible piece shape retaining member 2 are docked and locked.

Further, on the top surface of this fusible piece shape-retaining member 2, there are hooks 28, 28 for locking the buttoned protrusions 41, 41 of the lid body 4, and on the side surface, hooks 28, 28 are provided for locking the fusible piece shape-retaining member 2 in the fuse socket 3. A pair of locking step portions 33, 33 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, buttoned protrusions 41, 41 are formed on the lid body 4, and the lid body 4 is engaged with the shape retaining member 2 of these protrusions 41, 41.

As shown in FIGS. 4 and 5, the fuse socket 3 is equipped with a female lip socket 31.31 into which a terminal portion 1313 is fitted, and a button with a hook facing outward on the outer surface of the socket. Projecting pieces 32, 32 are provided in a protruding manner, and a locking step 33, 33 through which the button projecting pieces 32, 32 are inserted is provided on the outer surface of the shape-retaining member 2.
A buttoned protrusion 32 is engaged with the button 3.

The small fuse of this invention is constructed as described above, and as shown in FIG. When inserted, the terminal portion 13.13 and the female lip socket 31°31 are electrically connected, and
The buttoned 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 buttoned protrusions 32, 32 protruding from the fuse socket 3 are provided so as to project outward, and the outward hook portions 32A, 32A
Although an example is shown in which the buttons are respectively engaged with the locking step portions 33, 33 of the fusible piece shape retaining member 2, the hook portions 3 of the buttoned protrusions 32, 32 are
2A and 32A may be projected inwardly from the fuse socket 3, and these inwardly directed hooks may be engaged with recess steps formed in a counterbore on 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 recess into which the formed locking protrusion engages together with a terminal insertion hole, and a locking step provided on the shape-retaining member includes a female receptacle that connects with the terminal portion. Since the fuse socket has a fishing protrusion that engages with the fuse socket, it is safe because the fuse will not come off even if it is installed on objects with large vibrations such as mopeds and motorcycles. has.

[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 the 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 protrusion, 25...Latching recess, 31
...Female receptacle, 32...Fishing protrusion, 33...Lock step.

Claims (1)

[Scope of utility model registration request] A fusible piece forming member 1 has a link portion 12 in the center of a metal piece 11 shaped like an inverted U, and a pair of terminal portions 13 are formed by extending both sides of the link portion 12; A fusible piece shape-retaining member 2 provided with a locking recess 25 with which the locking projection 14 engages together with a terminal insertion hole 24, and the terminal portion 1
3, the fishing protrusion 3 is provided with a female lip set 31 to be joined to the fishing protrusion 3 and to be engaged with the locking step 33 provided on the shape retaining member 2.
2. A small fuse comprising: a fuse socket 3 having a fuse socket 3;