JPS596608Y2 - 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 fuse in which a fusible piece-shaped 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 housing. It concerns small fuses.

Conventional small fuses have metal caps attached to both ends of a cylindrical glass envelope, and a fusible piece placed inside the glass envelope 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 you carelessly 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 the specification of No. 67, a fusible piece is integrally formed with the terminal shape or 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 in which a pair of terminal insertion holes extending inward from the other end are provided with a space between the two terminal insertion holes to communicate with each other, and the fuse is inserted into a housing.

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

This invention aims to eliminate the above-mentioned drawbacks, and its features include a supporting part made of cast resin with a see-through hole in the center for viewing the state of the fusible piece from above; A fusible piece attachment part having a wedge-shaped cross section is integrally formed on one surface of the holding part, a see-through window for viewing the state of the fusible piece from the side is provided at the center of the fusible piece attaching part, and a fusible piece-shaped member is provided at the center of the see-through window from the end face. An introduction groove with a width slightly narrower than the plate thickness of the conductive metal plate, followed by a mounting groove with a width equal to the plate thickness of the fusible piece-shaped member, and a notch formed in the center of the fusible piece-shaped member made of conductive metal to form a link portion. The present invention provides a small fuse characterized in that the link portion is a fusible piece, and both ends of the fusible piece-shaped member are bent into an L shape to match the width of the fusible piece attachment portion, and terminal portions are provided respectively. An embodiment of this invention shown in the drawings will be described in detail below.

The compact fuse of this invention generally consists of a housing 1 and a fusible piece-shaped hollow member 2.

The housing 1 is integrally formed of cast synthetic resin with a grip part 11 having a see-through hole 12 in the center for viewing the state of the fusible piece from above, and a fusible piece attachment part 13 with a wedge-shaped cross section on one side of the grip part. There is a see-through window 14 in the center of the fusible piece attachment part 13 for viewing the state of the fusible piece from the side, and an introduction groove 15 in the form of a fusible piece or slightly narrower in width than the thickness of the member, which will be described later, in the center of the see-through window from the end face. Following this, a mounting groove 16 having a width equal to the thickness of the fusible piece-shaped member is provided.

Fusible piece-shaped member 2 is made of nickel-plated iron, phosphor blue,
A link portion 22 with a notch width of about 0.8 to 1.2 mm is cut out from both sides of the central part of a strip-shaped member 21 made of conductive metal such as copper or brass, and this link portion is used as a fusible piece 23 to carry an electric current. The thickness of this part is reduced to about 0.05 to 0.1 by milling so that the rating is, for example, 5A, and both ends of the strip-shaped member 21 are bent into an L-shape to match the width of the fusible piece attachment part 13. 24a and 24b.

The fusible piece-shaped hollow member 2 is forcibly inserted into the housing 1 through the introduction groove 15 as shown in FIGS. 2 and 3, and when inserted up to the fusible piece-shaped hollow member mounting groove 16, it plunges into the mounting groove 16 and is fixed.

In this way, as shown in FIG.
, 18b, the terminal portions 24a, 24b are positioned to protrude from the terminals 24a, 18b, respectively.

The small fuse of this invention is used to prevent overcurrent in electrical systems of automobiles, etc., and when used, a pair of contact pieces 31a and 31b are attached to a fuse socket in a housing 32 as shown in FIG. It is used by being inserted into 3.

The state of the fusible piece (unfused, blown) can be checked through the see-through hole 12 even when it is inserted into the fuse socket 3, and through the see-through window 14 if it is pulled out from the fuse socket 3.

When replacing, fuse socket 3 should be replaced with housing 1.
By holding the gripping portion 11 of the holder, it is possible to remove the fusible piece without touching it.

Note that the see-through window 14 has a thin wall 14 for preventing fuse blowing and scattering.
A may be in one or separate forms.

Figures 7, 8 and 9 show modified examples in which the fusible piece shape or member 2 is made of nine rods, the central part is crushed to form the link part 22, and this link part is made into a fusible piece. 23, the thickness of this part is milled to about 0.05 to 0.1 mm so that the current rating is, for example, 5A, and both ends of the round bar are bent into an L shape to form a terminal part 24a,
24b.

In particular, this invention has the feature that the link portion 22 is arranged horizontally, making it easy to see through the see-through hole 12.

As mentioned above, this invention consists of a grip part 11 made of cast synthetic resin with a see-through hole 12 in the center for viewing the state of the fusible piece from above, and a fusible piece attachment part with a wedge-shaped cross section on one side of the grip part 11. 13 is integrally formed, and in the center of the fusible piece mounting portion 13 is a see-through window 14 through which the state of the fusible piece can be viewed from the side, and at the center of the see-through window 14 from the end face is a see-through window 14 that is slightly narrower than the board thickness of the fusible piece-shaped member 2. An introduction groove 15 having a width, followed by a mounting groove 16 having a width equal to the thickness of the fusible piece-shaped member 2, and a link portion 22 formed by cutting out the center of the fusible piece-shaped member 2 made of conductive metal.
This link portion 22 is made into a fusible piece 23, and both ends of the fusible piece shape or member 2 are aligned with the width of the fusible piece attachment portion 13.
Since the bent terminal portions 24a and 24b are formed in a letter-like shape, it is easy to work and assemble, and there is no risk of touching the fusible piece during replacement, so there is less danger.
Since the overall thickness can be reduced and the height can be reduced, it has the advantage of saving space when arranging a large number of fuses in parallel.

[Brief explanation of the drawing]

The figures all show one embodiment of this invention. Figure 1 is an exploded perspective view of a small fuse, Figure 2 is a perspective view of the assembled fuse, Figure 3 is a side view, and Figure 4 is a front view. Figure, 5th
6 is an enlarged sectional view, FIGS. 7 and 8 are perspective views of other modifications, and FIG. 9 is an enlarged sectional view of the modification. 1... Housing, 11... Gripping part,
12...See-through hole, 13...Fusible piece attachment part, 14...See-through window, 15...Introduction groove, 16...Mounting groove , 17 a , 17 b...
... Locking hole, 2 ... Fusible piece molding part, 21.
・・・・・・Strip-shaped member, 22 ・・・・Link part, 2
3... Fusible piece, 24 a, 24 b...
...Terminal part, 25 a, 25 b... Hook part,
3...Fuse socket, 14A...
Thin wall to prevent fuse scattering.

Claims (1)

[Scope of utility model registration request] A grip part 11 having a see-through hole 12 in the center through which the state of the fusible piece can be viewed from above is formed by molding resin, and a fusible piece mounting part 13 having a wedge-shaped cross section on one side of the grip part 11 are integrally formed. A see-through window 14 for viewing the state of the fusible piece from the side is provided at the center of the fusible piece attachment portion 13, and an introduction groove 15 having a width slightly narrower than the plate thickness of the fusible piece-shaped control member 2 is provided at the center of the see-through window 14 from the end face. Subsequently, a mounting groove 16 having a width equal to the thickness of the fusible piece-forming member 2 is provided, and a link portion 22 is formed by cutting out the center portion of the fusible piece-forming member 2 made of conductive metal.
is the fusible piece 23, and the both ends of the fusible piece-shaped member 2 are bent into an L shape to match the width of the fusible piece attachment part 13, and the terminal part 24a
, 24b, respectively.