JP2007059083A - Attachment structure for fuse blown-out indicator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attachment structure for a fuse blown-out indicator which is improved to allow the fuse blown-out indicator to be post-attached to a fuse body with ease. <P>SOLUTION: The attachment structure involves the post-attachment of a fuse blown-out indicator 4 to indicate the fuse blown-out operational status to a fuse body 1 equipped with a conductive cap 2 and an L-shaped terminal block 3 on both ends of a fuse tube. The detachable fuse blown-out indicator is attached by joining in a snap-fit style a conductive attachment plate 5 fitted to conductive caps on both ends of the fuse blown-out indicator to the terminal block 3 of the fuse body. In particular, an insertion hole 5b is made for fitting a cap of the fuse blown-out indicator 4 to the surface of the Z-shaped attachment plate 5 which is sheet metal-processed with a conductive plate having a spring performance folded into a half. Furthermore, an engagement protrusion 5a is formed in opposition to a front edge leg extending in the two-forked shape, and the engagement protrusion is fitted to an engagement hole 3a which is made on the terminal block of the fuse body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  According to the present invention, a fusing display device (accessory) for indicating a fusing operation state of a fuse having a terminal plate provided with a conductive cap and a terminal plate at both ends of the fuse cylinder can be retrofitted to the fuse. The present invention relates to a display device mounting structure.

With the exception of display type fuses that have a fuse display mechanism, the general fuse with a terminal cannot be used to check the fusing operation of the fuse body from the outside. A display device is prepared (see, for example, Patent Document 1 and Patent Document 2).
Next, FIGS. 3A to 3D show a conventional structure of a fuse with a fusing display device for the cylindrical fuse. In the figure, reference numeral 1 denotes a fuse element having a fuse element and arc-extinguishing sand, and a fuse body provided with a conductive cap 2 and an L-shaped terminal plate 3 at both ends. (Accessories) 4a is a fusing display bar, and 5 is a mounting plate for attaching the fusing display device 4 to the fuse body 1.
Here, in order to attach the fusing display device 4 to the fuse body 1, stud bolts 6 are welded and fixed in advance to the peripheral surfaces of the conductive cap 2 disposed at both ends of the fuse body 1. The mounting plate 5 wound around the stud bolt 6 is fastened to the stud bolt 6 with a nut 7. The detailed structure of the fusing display device 4 and the fusing display operation are described in Patent Document 1, and the description thereof is omitted here.

In addition, the fusing display device 4 responds to the protrusion operation of the display bar 4a as disclosed in Patent Document 2 in addition to the type in which the fusing state of the fuse is visually discriminated by the display bar 4a protruding from the end thereof. There is also a type in which a fuse is blown out as an electrical signal in combination with a micro switch.
JP-A-5-62588 JP-A-6-84445

By the way, the conventional mounting structure for mounting the fusing display device to the fuse body has the following problems in practical use.
In other words, as a model of a cylindrical fuse with a terminal in the past, a manufacturer separately manufactured a standard type fuse that does not support the use of a fusing display device and a fuse with a fusing display device that supports the use of a fusing display device. For a model with a fusing display device, the stud bolt 6 shown in FIG. 2 is welded to the conductive cap 2 of the fuse body 1 in the manufacturing process, and the fusing display device 4 is connected to the stud bolt 6 at the request of the user. The product is shipped after being attached to. In contrast, the standard type fuse is not provided with the stud bolt 6.
For this reason, users who have purchased a standard product cannot retrofit the fuse display device to the fuse body after purchase, and in order to use the fuse display device, purchase a new product with a stud bolt. There is a need.

  Therefore, the purpose of the present invention is to make it easy to retrofit a fusing display device with a standard fuse in consideration of user convenience and economy, and to improve the manufacturing cost at the manufacturer side as well. Another object of the present invention is to provide a fuse fusing display device mounting structure.

In order to achieve the above object, according to the present invention, as a mounting structure for retrofitting a fuse having a conductive cap and a terminal plate at both ends of a fuse cylinder with a fusing display device for displaying a fusing operation state of the fuse. , A clip-type conductive attachment member made of a conductive material is fitted to the conductive caps at both ends of the fusing display device, and the attachment member is snap-fitted to the terminal board of the fuse body to attach the fusing display device detachably ( As a specific aspect of the first aspect of the invention, the conductive attachment member is configured as follows.
That is, the mounting member is formed by folding a conductive plate having a spring property into two, opening a fitting insertion hole for fitting the fusing display device on the plate surface, and extending the bifurcated tip side leg piece. The engaging projections are formed facing each other, and the engaging projections are snap-fitted into the engaging holes formed in the terminal plate of the fuse body to be locked and fixed.

According to the above configuration, only a small engagement hole is formed in the terminal board of the fuse body, and even if the stud bolt as described in FIG. The device can be easily retrofitted via the mounting member having the above-described configuration.
Therefore, by using a fuse with a structure in which an engagement hole is formed in the terminal board of the fuse body as a standard product, the manufacturer can handle both use and non-use of a fusing display device, and fusing according to user requirements The product can be shipped with the display device attached, or the user who has purchased the fuse without the fusing display device can add the fusing display device as needed.
As a result, serviceability to the user can be improved, and the manufacturer can also reduce the product cost because it is not necessary to weld stud bolts.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS. In addition, in the figure of an Example, the same code | symbol is attached | subjected to the member corresponding to FIG. 3, and the description is abbreviate | omitted.
That is, in the illustrated embodiment, the attachment plate 5 (attachment member) of the fusing display device 4 is a Z-shaped sheet metal product obtained by folding a conductive plate having a spring property into two U-shapes, and the folding is performed in half. An insertion hole 5b (a hole having a diameter corresponding to the outer diameter of the fusing display device 4) for fitting the conductive cap of the fusing display device 4 is opened on the plate surface close to the end, and is bifurcated. Engaging protrusions (small protrusions functioning as dowels) 5a are formed facing each other on the extending leg piece on the distal end side. On the other hand, an engagement hole (dwelling hole) 3a corresponding to the engagement protrusion 5a is formed in the plate surface (rising base) of the L-shaped terminal plate 3 of the fuse body 1.
Then, in order to attach the fusing display device 4 to the fuse body 1, the insertion holes 5 b opened in the clip-type mounting plate 5 (use two pieces) are formed in the conductive caps arranged at both ends of the fusing display device 4. Then, the engagement protrusion 5a is inserted into the engagement hole 5 by pushing it in from the side of the fuse body 1 so that the terminal plate 3 is sandwiched from the front and rear by the bifurcated leg piece extending to the front end side of the mounting plate 5. 3a is snap-fit coupled (see FIG. 1 (d)), and is clamped and fixed to the terminal board 3 by using the spring property of the mounting board 5 at this position. As a result, the fusing display device 4 is connected in parallel to the fuse body 1 via the mounting plate 5.

  When the fusing display device 4 is removed from the fuse body 1, the leg piece of the mounting plate 5 is widened to release the engagement between the engagement protrusion 5 a and the engagement hole 3 a of the terminal plate 3. Can be pulled out.

It is a figure showing the attachment structure of the fusing display apparatus by the Example of this invention, (a) is a front view of the state which attached the fusing display apparatus to the fuse body, (b) is the same top view, (c) is (a). (D) is an enlarged sectional view of part A in (a) 1 is an exploded perspective view illustrating the assembly procedure of FIG. FIG. 2 is a diagram showing a conventional fusing display device mounting structure, in which (a) is a front view showing a state in which a fusing display device is attached to a fuse body, (b) is a plan view thereof, and (c) is a side view of (a); ) Is an end view of the fuse body with no fusing display attached

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuse main body 2 Conductive cap 3 Terminal board 3a Engagement hole 4 Fusing display apparatus 5 Mounting plate 5a Engaging protrusion 5b Fitting insertion hole of fusing display apparatus

Claims (2)

This is a mounting structure for retrofitting a fuse having a conductive cap and a terminal plate at both ends of a fuse cylinder to a fusing display device for displaying the fusing operation state of the fuse. A fuse fusing display device mounting structure in which a clip-type attachment member is fitted and the fusing display device is detachably locked and connected to the terminal plate of the fuse body through the attachment member. 2. The fusing display device mounting structure according to claim 1, wherein the mounting member folds the conductive plate having a spring property, opens an insertion hole for fitting the fusing display device on the plate surface, and has a bifurcated shape. An engaging projection is formed on the front leg piece extending to the opposite side, and the engaging projection is snap-fitted into an engaging hole formed in the terminal plate of the fuse body to be locked and fixed. Fuse display device mounting structure for the fuse.

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