JPS5921502Y2 - Terminal block with fuse - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a terminal block with a fuse used in lighting equipment and the like.

A conventional terminal block is equipped with a current fuse that detects the current capacity in the event of an abnormality such as a short circuit in the ballast winding, and prevents accidents such as fire by fusing in response to abnormal current, as shown in Figure 7. A terminal plate 71 and a fuse 72 were arranged side by side on the main body 70, and terminal parts 73 and 74 were provided at both ends of the fuse 72.

75 is a terminal screw, 76 is a cover, 77 is a cover engagement recess, 78 is a body mounting projection, 79 is a driver insertion hole, 8
0 is a power supply line, and 81a to 81C are load-side connections such as a ballast and a lamp socket.

Therefore, the total length of the terminal block in the connection direction increases by the length of the fuse 72, increasing the material cost, and when attached to the device main body 82 as shown in FIG. A large space is required for wiring,
Further, there is a drawback that such a terminal block cannot be directly attached to the ballast 83, and cannot be used particularly in cases where there are many built-in parts such as batteries and blocks, such as in emergency lighting equipment.

In contrast, Figures 1 and 2 show examples of proposals aimed at miniaturization.
As shown in the figure.

That is, this terminal block with a fuse has a recess 4 formed in the center of one of the two rows of terminal plate mounting grooves 2°3 formed in the main body 1, and a Z-shaped bend in one of the two rows of terminal plate mounting grooves 2°3 formed in the main body 1. Attach one end of the first terminal plate 5 and insert the tongue piece 5a into the recess 4.
A terminal screw 6 located at one end of the main body 1 is provided at the one end.

Further, a second terminal plate 7 bent in a Z-shape is mounted on the opposite side with the recess 4 in between, and its contact piece 7a is positioned vertically above the recess 4.

The fuse 8 is held between the tongue piece 5a and the contact piece 7a in a vertical position.

9 is a strip-shaped terminal plate attached to the adjacent groove 3, and a terminal screw 10 is provided at one end of the strip-shaped terminal plate.

A cover 11 has a hole 12 for inserting a screwdriver into the terminal screw 6.10, and a box portion 13 for accommodating a protruding portion of the fuse 8 from the main body 1.

This terminal block with a fuse has power wires (
(not shown) is connected, and a load line is connected to the opposite side of the terminal screws 6 and 10.

FIG. 2 shows this terminal block A installed on the base 15 of a ballast 14 of a fluorescent lamp.

With this configuration, the terminal block A can be made compact by standing up the fuse 8, reducing the terminal block space and reducing material loss. It does not narrow the space and can be directly attached to the ballast, and in this case the height will be slightly larger, but it will utilize the dead space of the conventional ballast and will not get in the way.

However, in this terminal block with a fuse, the tongue piece 5a that contacts the fuse 8 and the contact piece 7a contact the end face of the fuse 8 and are clamped in the axial direction, so it is necessary to open the contact piece 7a when replacing the fuse. For this reason, the axial elasticity of the fuse is weakened by molded fuse replacement, resulting in a lack of contact reliability.

Furthermore, it is not easy to replace the fuse, and it is dangerous because the fuse is a live part.

Therefore, an object of this invention is to provide a terminal block with a fuse that allows safe and easy fuse replacement and provides long-term contact reliability.

An embodiment of this invention is shown in FIGS. 3 to 6.

That is, in this terminal block with a fuse, the first terminal plate 16 is a strip-shaped plate, and the terminal screw 18 is passed through a notch 17 at one end, screwed into a square nut 19, and the other end is screwed into a square nut 19. A square hole 20 with a width a is formed.

The main body 1 corresponds to the square nut 19 of this first terminal plate 16.
A first recess 21 is formed in the square hole 20 and a second recess 21 is formed in the square hole 20.
A recessed portion 22 is formed, and the intermediate portion is individually defined by a driving stud 23.

Further, the second terminal plate 24 has a tongue piece 25 bent into a U-shape like a spoon, and a protrusion 26.2 on the opposite side of the tongue piece 25.
7 is formed by bending and cutting.

The mutual spacing between the protrusions is narrower than the outer diameter of the lower electrode 8a of the fuse 8, and the third four portions 28 formed in the groove 2'
and are individually identified with driving rivets 29.

The fuse holding fitting 30 connects the connecting portion 31 at the lower end of the strip to the U
The contact piece 32 at the upper end is a pair of contact pieces 32.
a.

32b are laterally opposed to each other, and a mounting cut-and-raised piece 33 is formed at the center of the upper end.

The upper end of the holding fitting 30 is inserted into the fuse accommodating part 35 of the cover 34, and the cut and raised piece 33 is engaged with a square hole 36 formed in the side wall of the fuse accommodating part 35 to fix it.

37 is a cover fitting protrusion formed on the main body 1', and 38 is an engagement hole formed on the cover 34.

To install fuse 8, cover fuse 8 with cover 34 (
7) Insert the upper electrode 8b through the opening of the storage section 35, hold the contact pieces 32a and 32b, and close the cover 34.
By attaching the fuse 8 to the main body 1', the lower electrode 8a of the fuse 8 is inserted into the tongue portion 25 of the terminal plate 24, and the connecting portion 31 of the holding fitting 30 is inserted into the square hole 20.

At this time, since the width of the connecting portion 31 satisfies a<b, the electrical connection is reliable, and when the power wire 39 is tightened to the terminal screw 10.18 and the load wire 40 is soldered to the terminal plates 9 and 24, This means that the fuse 8 is connected in series between the power line 39 and the load line 40.

When replacing fuse 8, cover 3 as shown in Figure 6.
4 from the main body 1' and the fuse 8 from the cover 34.

That is, the contact piece 32a. The fuse holding force of 32b is greater than that of the tongue portion 25.

With this configuration, the fuse 8 can be replaced easily and safely, and even if the fuse holding force weakens due to replacement, the tongue piece 25 and the contact pieces 32a, 32b can be simply bent in the radial direction. It can be easily restored and contact reliability can be maintained for a long period of time.

As described above, the terminal block with a fuse of this invention includes a main body in which a fuse storage recess is formed and a cover hook is formed;
a first terminal plate that is attached to one end of the base body and has a square hole formed in the tip that approaches the fuse storage recess;
a second terminal plate that is attached to the other end of the base body and has a U-shaped tongue piece disposed in the fuse storage recess for radially holding the fuse; and a locking portion that is hooked to the cover hook portion. and a cover having a fuse storage recess opposite to the fuse storage recess, and a holder attached to the storage recess of the cover and having a fuse holding force greater than that of the U-shaped tongue piece at the bottom thereof. The fuse holding fitting has a U-shaped connecting part that fits into the square hole of the first terminal plate and fits into the square hole of the first terminal plate, so that the fuse can be made smaller and the fuse can be replaced safely and easily. Moreover, there is an effect that contact reliability can be obtained over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the proposed example, Fig. 2 is a partial perspective view of the device attached to the stabilizer, Fig. 3 is a perspective view of an embodiment of this invention, and Fig. 4 is a cross section taken along the line IV-IV. Fig. 5 is a partially exploded perspective view of the device, Fig. 6 is a side view with the cover removed, Fig. 7 is an exploded perspective view of the conventional example, and Fig. 8 is an exploded perspective view of the conventional example. FIG. 1'...Base body, 8...Fuse, 2
8... Fuse storage recess, 16... First terminal plate, 20... Square hole, 24...
Second terminal plate, 25...U-shaped tongue piece, 30.
... Fuse holding fitting, 31 ... U-shaped connection part, 32 ... Holding contact piece part, 34 ...
... Cover, 35 ... Fuse storage recess, 3
7...Cover fitting protrusion (hanging part), 38...
...Engagement hole (locking part).

Claims (1)

[Scope of utility model registration request] a base body formed with a fuse housing recess and a cover hook; a first terminal plate that is attached to one end of the base body and has a square hole formed in its tip that approaches the fuse housing recess; A second terminal plate is attached to the other end of the base body and has a U-shaped tongue piece disposed in the fuse storage recess to hold the fuse in the radial direction, and a locking part that is hooked on the cover hook part. a cover having a fuse accommodating recess formed opposite to the fuse accommodating recess, and a holding device that is attached to the accommodating recess of the cover and has a fuse holding force larger than that of the U-shaped tongue piece at its bottom. A terminal block with a fuse, comprising a fuse holding fitting having a contact piece and a U-shaped connection portion that fits into and elastically contacts the square hole of the first terminal plate.