JPH0227483Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a small fuse, and more specifically, it is connected to a link part that serves as a fusible piece, and is opposed to a metal piece formed in an approximately inverted U shape. The present invention relates to a plug-in type compact fuse with good workability, in which a fusible piece forming member having a terminal portion formed thereon is attached to a shape retaining member.

[Prior Art] Conventional small fuses have been made by attaching metal caps to both ends of a cylindrical glass tube, and welding a fusible piece placed inside the glass tube between the caps, but this has resulted in lower manufacturing costs and lower user costs. This is not a good idea from a protection point of view, as if you inadvertently touch the cap during replacement, you will get a shock, and if the fuse mounting part is exposed and you touch it with a tool, the glass tube will break and become unusable. The problem is that it gets lost.

[Problem to be solved by the invention] In order to solve the above-mentioned problems,
- As described in Published Patent No. 135339, 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 is attached to a gripping portion at one end. A plug-in type fuse has been proposed that 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. There is.

Although this fuse has a structure sufficient to solve the above-mentioned conventional problems, a pair of blade-shaped terminal pieces and a fusible piece element are formed by punching from a single sheet metal member, and then the fusible piece The number of man-hours required for assembly can be reduced because the link part is formed by trimming by milling, etc., but the processability and material utilization rate are poor, and large terminal pieces are attached to both ends of the fusible ring part with a small step area. If you don't handle the die cutter carefully, it will bend, and if you fix it, it will break and become unusable.
There is a problem that the overall height becomes large.

Furthermore, in order to eliminate such problems, as described in Utility Model Publication No. 54-9843, the main body is curved in a U-shape and held in a housing formed of an insulating material. , inserting a plate-shaped fuse having a constricted portion in its substantially central portion into a through hole provided in the housing, and folding the plate-shaped fuse along the terminal protrusion protruding from the lower end of the housing; A small fuse with a terminal portion formed therein has been proposed.

However, in this configuration, the terminal is thick and requires a special configuration on the receptacle side.
There are problems in that it is not general and requires the act of bending, resulting in poor workability.

In order to eliminate each of the above-mentioned problems, this invention connects a link part that serves as a fusible piece,
To provide a plug-in type small fuse in large quantity at low cost, in which a fusible piece forming member having a terminal portion facing a metal piece formed in an approximately inverted U shape is attached to a shape retaining member.

[Means for Solving the Problems] The purpose of this invention described above is to provide a link portion serving as a fusible piece in the approximate center of a metal piece having an approximately inverted U shape, and to provide a link portion serving as a fusible piece on both sides of this link portion. Each piece is provided with a stepped portion to form opposing terminal portions that are slightly narrower than the width of the metal piece, and
a fusible piece forming member in which the metal piece is provided with a locking V-shaped wedge-shaped protrusion protruding outward toward the link portion closer to the link portion than the step portion; A recess whose length in the vertical direction is approximately equal to the distance between the upper edge of the wedge-shaped protrusion and the stepped portion is formed in the middle of the through hole, and the width of the through hole extends downward from the lower edge of each of these recesses. and a fusible piece shape-retaining member formed to have a width approximately equal to the width of the terminal portion, and the terminal portion of the fusible piece-forming member is inserted into the pair of through holes of the fusible piece shape-retaining member to form the stepped portion. This is achieved by inserting the fusible piece forming member into the fusible piece shape retaining member by supporting the lower edge of the recess and locking the upper edge of the wedge-shaped protrusion with the upper edge of the recess.

[Function] A terminal portion of a fusible piece forming member made of a metal piece formed into an approximately inverted U shape and having a link portion is inserted into a pair of through holes of the fusible piece shape retaining member to form a step in the middle of the metal piece. The fusible piece is supported by the lower edge of the recess of the fusible piece shape-retaining member, and the upper edge of a wedge-shaped protrusion protruding outward from the metal piece is locked with the upper edge of the recess. The forming member can be inserted into the fusible piece shape-retaining member, and by inserting the opposing terminal portions into the female connector of the fuse box, it can be used as a plug-in type small fuse.

[Example] Examples will be described with reference to the drawings.

First, the basic structure of this invention is as shown in FIG. piece 11, 11
A step portion 15 is provided on each of the metal pieces 11 to form opposing terminal portions 13, 13 whose width is slightly narrower than the width of the metal piece 11.
The fusible piece forming member 1 is constructed by providing locking V-shaped wedge-shaped protrusions 14, 14 that protrude outward and upward toward the sink portion 12.

As shown in FIG. 2, the wedge-shaped protrusion 14
Through-holes 24, 2 formed slightly thinner than the protruding dimension of
A recess 25, 2 whose length in the vertical direction is approximately equal to the distance between the upper edge of the wedge-shaped projection 14 and the step 15 is provided in the middle part of the wedge-shaped projection 14.
5, and the width of the through holes 24, 24 extending downward from the lower edges of the respective recesses 25, 25 is formed to be approximately equal to the width of the terminal portions 13, 13.

Then, as shown in FIGS. 3, 4, and 5, the terminal portions 13, 13 of the fusible piece forming member 1 are inserted into the pair of through holes 24, 24 of the fusible piece shape retaining member 2, and the step portion 15 by the lower edge of the recess 25, and by locking the upper edges of the wedge-shaped protrusions 14, 14 with the upper edges of the recesses 25, 25, the fusible piece forming member 1 is fixed to the fusible piece shape retaining member. It is inserted into 2.

The above configuration will be explained in more detail below.

As shown in FIG. 1, the fusible piece forming member 1 is made by punching a metal plate 11, which is electrically conductive and has a relatively low melting point, into a rectangular shape, such as a zinc alloy. is cut out to about 0.8 to 1.2 mm to form a link portion 12 that serves as a fusible piece.

Then, this link part 12 is used as a fusible piece, and the thickness of this part is reduced to about 0.05 to 0.1 mm by milling so that the current rating is, for example, 5A.
Both ends of the strip-shaped metal piece 11 are shaped like an inverted U, that is, ∩
The fusible piece terminal portions 13, 13 are formed by curving the shape.

In addition, a locking wedge V-shaped wedge-shaped protrusion 14 is formed slightly above the terminal portions 13, 13.

The fusible piece shape-retaining member 2, which is to maintain the ∩ shape of the fusible piece forming member 1, is formed into a thick plate from an insulating heat-resistant synthetic resin such as phenol resin or glass fiber reinforced nylon, and a hole is formed in the center of the plate in the longitudinal direction. The width of the heat radiation hole 23 and the wedge-shaped protrusion 14 protruding from one surface of the metal piece to the other surface of the metal piece into which the terminal portions 13, 13 of the fusible piece forming member 1 are to be inserted and fixed on both sides of the heat radiation hole 23. Slightly narrower flat hole 2
4 and 24, and the V-shaped wedge-shaped protrusions 14, 14 for locking provided on the upper part of the terminal parts 13, 13 are inserted into the slightly lower side surfaces of these through holes as shown in FIG. Locking hole or recess 2 to prevent it from coming off
5 and 25 are arranged so as to communicate with the through holes 24 and 24.

Next, if the fusible piece forming member 1 shown in FIG. 1 is forcibly inserted from above into the through holes 24, 24 of the fusible piece shape retaining member 2 shown in FIG. 2 from its terminal parts 13, 13, the parts shown in FIG. As shown in FIG. 4 and FIG.
4 is pushed against the elasticity of the bridging pieces 26, 26, passes through the through hole, and enters the locking recesses 25, 25 by the elasticity of the bridging pieces 26, 26. The protrusions 14, 14 engage with a snap, and the fusible piece forming member 1 and the fusible piece shape retaining member 2 are integrated as shown in FIG.

In this state, when the fusible piece forming member 1 moves downward relative to the fusible piece shape retaining member 2, the stepped portions 15, 15 engage with the lower edges 27, 27 of the locking recesses 25, 25, as shown in FIG. At the same time, upward movement of the fusible piece forming member 1 relative to the fusible piece shape retaining member 2 is reliably prevented by engagement of the upper edge of the locking V-shaped wedge-shaped protrusion 14 with the upper edge of the locking recess 25. The horizontal and vertical movements of the fusible piece forming member 1 with respect to the fusible piece shape retaining member 2 are performed through the through holes 24 and 2.
Blocked around 4.

Since this invention has the above-described configuration, the terminal portions 13, 13 can be attached to female receptacles 31, 31 provided in a fuse box 3, etc. installed in a vehicle, etc., as shown in FIG. It can be used by

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 portion 12, a cover/see-through member 21 made of a transparent material as shown in FIG. It is sufficient to use the hook part 28 of the holder by attaching it to the hook part 28 of the holder, and furthermore, as a means for this attachment, the hooking protrusions 29, 29 are used as shown by the chain lines in FIG.
may be formed on the see-through member 21 which also serves as a lid body, and may be engaged with the fusible piece shape-retaining member 2 with these hooked protrusions 29, 29.

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

Furthermore, when the lid/transparent member 21 configured to lock is not used, for example, a transparent thin wall 21a is provided in the longitudinal direction of the fusible piece shape-retaining member 2 as shown by the chain line in FIG.
All you have to do is set it up.

To remove the fuse of this invention from the fuse bottle 3, hold the fusible piece shape retaining member 2 and pull it out without touching the fusible piece.

[Effects of the invention] Since this invention is configured as described above, it produces the effects described below.

A link portion 12 serving as a fusible piece is provided approximately at the center of the approximately inverted U-shaped metal piece 11, and step portions 15 are provided on each of the metal pieces 11, 11 on both sides of this link portion 12, so that the metal piece A locking V is formed on the metal piece 11 to be closer to the link portion 12 than the step portion 15 and protrude upwardly from the metal piece 11. A fusible piece forming member 1 provided with wedge-shaped protrusions 14 , 14 and a through hole 24 , 24 formed slightly thinner than the protruding dimension of the wedge-shaped protrusions 12 have a longitudinal length at the intermediate portion thereof. Recesses 25, 25 are formed that are approximately equal to the distance between the upper edge and the stepped portion 15, and the width of the through holes 24, 24 extending downward from the lower edge of each of these recesses 25, 25 is set to the terminal portion 13, 1
and a fusible piece shape retaining member 2 formed to have a width approximately equal to that of the fusible piece forming member 1.
The terminal portions 13, 13 of are inserted into the pair of through holes 24, 24 of the fusible piece shape retaining member 2 to support the stepped portion 15 at the lower edge of the recess 25, and the wedge-shaped protrusion 1
By locking the upper edges of 4 and 14 with the upper edges of the recesses 25 and 25, the fusible piece forming member 1 is inserted into the fusible piece shape retaining member 2, and a plug-in type small fuse according to this invention can be obtained. Therefore, it is easy to work and assemble, and there is no risk of touching the fusible piece when replacing it, so there is less danger.The overall thickness is thinner and the height can be lowered, making it easier to install many fuses in parallel. It does not take up much space, and compared to the conventional example, it can be stamped as a fusible piece and waste of material can be significantly reduced, which has the effect of being economical.

In particular, in this invention, a V-shaped wedge-shaped protrusion for locking is formed on the metal piece, and the through-hole 24 of the fusible piece shape-retaining member 2 is
By forcibly press-fitting the shape-retaining member, both the upper and lower edges of the through-hole 24 are tightly sandwiched between the elasticity inherent in the material of the fusible piece shape-retaining member and the protrusion 14 and the stepped portion 15, and the Since the locking V-shaped wedge-shaped protrusion 14 and the stepped portion 15 are not deformed, the metal piece 11 and the fusible piece shape retaining member 2 can be firmly locked together, and no wobbling occurs, and the receptacle It also has the effect of being easy to insert into.

[Brief explanation of drawings]

Each of the figures shows one embodiment 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 completed product of a small fuse of this invention. FIG. 4 is a perspective view, and FIG. 5 is a side view taken in a different direction from FIG. 3. DESCRIPTION OF SYMBOLS 1... Fusible piece forming member, 2... Fusible piece shape retaining member, 11... Metal piece, 12... Link part, 13...
...Terminal part, 14...V-shaped wedge-shaped protrusion for locking, 15...
...Stepped portion, 23... Heat radiation hole, 24... Through hole, 25...
...a locking recess or hole.

Claims (1)

[Scope of utility model registration request] A link portion 12 serving as a fusible piece is provided approximately at the center of the approximately inverted U-shaped metal piece 11, and step portions 15 are provided on each of the metal pieces 11, 11 on both sides of this link portion 12, so that the metal piece A locking V is formed on the metal piece 11 to be closer to the link portion 12 than the step portion 15 and protrude upwardly from the metal piece 11. A fusible piece forming member 1 provided with wedge-shaped protrusions 14 , 14 and a through hole 24 , 24 formed slightly thinner than the protruding dimension of the wedge-shaped protrusions 14 have a longitudinal length at an intermediate portion thereof. Recesses 25, 25 are formed that are approximately equal to the distance between the upper edge and the stepped portion 15, and the width of the through holes 24, 24 extending downward from the lower edge of each of these recesses 25, 25 is set to the terminal portion 13, 1
and a fusible piece shape retaining member 2 formed to have a width approximately equal to that of the fusible piece forming member 1.
The terminal portions 13, 13 of are inserted into the pair of through holes 24, 24 of the fusible piece shape retaining member 2 to support the stepped portion 15 at the lower edge of the recess 25, and the wedge-shaped protrusion 1
A small fuse formed by inserting the fusible piece forming member 1 into the fusible piece shape retaining member 2 by locking the upper edges of the recesses 25 and 25 with the upper edges of the recesses 25 and 25.