JP2010272443A - Fitting structure of fuse blowout indicator and fuse with fuse blowout indicator having the fitting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fitting structure of a fuse blowout indicator attaining saving of constitutional components, simplification of manufacturing steps and cost saving by devising the fitting structure of the fuse blowout indicator to a main fuse in a fuse with an arc-extinguishing material containing fuse blowout indicator and the fuse with the fuse blowout indicator having the fitting structure. <P>SOLUTION: In the fitting structure 50 of the fuse blowout indicator and the fuse 60 with the fuse blowout indicator having the fitting structure 50, the fuse blowout indicator 3 is parallel-connected with the main fuse 1 including a fuse element 4, an electrically insulating cylindrical casing 5, the arc-extinguishing material 6 filled in the cylindrical casing 5, and a conductive cap body 2 closing both end parts of the cylindrical casing 5 and a hole 7 filled with the arc-extinguishing material 6 and formed in the cap body 2 is also used a fitting hole into which the fuse blowout indicator 3 is fitted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuse with a blown display device. More specifically, the present invention relates to a structure for mounting a fusing display device to a fuse body and a fuse with a fusing display device provided with this mounting structure.

  Conventionally, in the electric equipment field, in order to protect an electric circuit from overcurrent, for example, a fuse 70 with a blown display device shown in FIG. 6 has been used.

  The fuse 70 with a fusing display device is erected from a surface of a conductive cap 72 that is mounted in advance on both ends of the main fuse 71 by soldering stud bolts 73 and fixing means such as welding, and the fusing display device 74 is provided therewith. The mounting bracket 75 is fitted and fixed with a nut 76 (for example, Patent Documents 1 to 3).

  The operation of the fuse 70 is provided when an overcurrent flows through a fuse element (not shown) inside the main fuse 71 and blows, and the overcurrent immediately flows through the fixed band 75 to the blown display device 74 and is provided therein. A fusing indication fuse (not shown) is blown out, and this fusing fact is notified by protruding a fusing indication bar 77 to the outside.

  However, in the mounting structure of the fuse 70 with a fusing display device, the nut 76 is easy to loosen due to vibration or the like, and as a fastening member of the fusing display device 74, two mounting brackets 75, stud bolts 73, and nuts are provided. Many members such as 76 are required.

  On the other hand, in the fuse 70 with a fusing display device, an arc extinguishing agent filling hole (not shown) is opened at any location of the conductive cap 72 at both ends of the casing in order to extinguish an arc generated when the fuse element is blown. From this point, the main fuse 71 may need to be filled with an arc extinguishing agent (not shown). After filling, the main fuse 71 must be closed with an appropriate closing means such as a plug. The work target is also the same conductive cap 72 as the mounting location of the fusing display device.

  Accordingly, the conductive cap 72 is connected to the series of the work of attaching the fusing display device 74, the filling of the arc extinguishing agent, and the work of closing, and each work requires a dedicated fastening member and a dedicated tool. For this reason, there has been a problem that it takes time to assemble the whole fuse with the arc-extinguishing-blown display device and is not productive.

JP 2007-59083 A (reference numerals 6 and 7 in FIG. 3) JP 2007-287458 A (reference numerals 6 and 7 in FIG. 4) Japanese Utility Model Publication No. 2-332645 (Fig. 6)

  The present invention has been made in view of such circumstances, and in a fuse with an arc extinguishing agent-containing fusion display device, by devising the attachment structure of the fusion display device to the main fuse, the number of fuse components can be reduced, It is an object of the present invention to provide a fuse blown display device mounting structure capable of simplifying the manufacturing process and realizing a cost reduction associated therewith, and a fuse with a blown display device provided with this mounting structure.

  In order to achieve the above object, a fuse blown display device mounting structure according to the present invention includes a fuse element, an electrically insulating cylindrical casing that surrounds the fused portion of the fuse element, and an eraser filled in the cylindrical casing. A fuse blown display device mounting structure that is connected in parallel to a main fuse comprising an arc agent and a conductive cap body that seals both ends of the cylindrical casing, and displays the fusing operation status of the main fuse. The fusing display device is fixed to an arc-extinguishing agent filling hole provided in the cap body of the main fuse as an attachment hole of the fusing display device.

  The fuse with a blown display device according to the present invention is characterized in that the fuse blown display device has a mounting structure.

  The mounting structure of the fusing display device according to the present invention serves as both the arc-extinguishing agent filling hole and the fusing display device mounting hole. In order to allow filling into the cap, the inner diameter is a through-hole of the cap body having a dimension larger than the outer diameter of the arc-extinguishing agent, and the fusing display device does not wobble due to vibration or the like after the arc-extinguishing agent is filled. It is necessary to fix the main fuse to the main fuse and to prevent the filler from leaking from the mounting hole after fixing.

  Such a fusing display device mounting structure is not particularly limited and may have any structure. For example, a female screw hole having an inner diameter of about 3 to 5 mm provided in the cap body is used as a filling hole for the arc extinguishing agent. After use, it may have a mounting structure in which it is fixed (closed) with a fastening member such as a small screw or bolt via a mounting bracket. Instead of the fastening member such as a small screw or bolt, a semi-tubular rivet ( It is good also as an attachment structure which fixes fastening members, such as another name: blind rivet) and a push rivet, via an attachment metal fitting.

  Further, as will be described in Example 3 to be described later, a protrusion having an arc-extinguishing agent filling hole at the center is provided on the end surface or outer peripheral surface of the cap body, while the front end of the mounting bracket of the fusing display device is provided. It is good also as the method of providing the recessed part which can be fitted to the said protrusion and fitting and fixing a recessed part to a protrusion after filling an arc-extinguishing agent inside a cylindrical casing from an arc-extinguishing agent filling hole.

  With the mounting structure consisting of the above-mentioned protrusion and a recess that can be fitted to the protrusion, the mounting bracket of the fusing display device can be fixed to the cap body with a single touch, and the mounting strength has a practically no problem, and the filling hole Since the blocking effect can be obtained at the same time, the production efficiency of the fuse with a fusing display device can be increased.

  In addition, as the material of these mounting brackets and fastening members (blocking members), since the current at the time of fusing the main fuse flows through the mounting bracket of the fusing display device to the fusing display fuse in the device, Needless to say, something is needed.

  The mounting position of the mounting bracket of the fusing display device may be any position on the outer peripheral surface or end surface of the cap body, and in the present invention, this position is also the position where the arc-extinguishing agent filling hole is disposed.

  In addition, as a specific aspect of the mounting bracket, as shown in FIG. 6 described above, a thing separate from the fusing display device is created, and the mounting bracket is spanned between the fusing display device and the cap body. It may be fixed by a fastening member, or may be an embodiment in which the same member as either the cap body or the fusing display device is extended to the other member and fixed.

  According to the mounting structure of the fuse blown display device of the present invention, the blown display device is fixed to the arc-extinguishing agent filling hole provided in the cap body of the main fuse also as the mounting hole of the blown display device. Due to the mounting structure, it is only necessary to open a single hole, which is conventionally provided for the fusing display device and the arc-extinguishing agent in the cap body, and fastening for fusing display device attachment. The member can also be used as a closing member for the arc-extinguishing agent filling hole.

  Accordingly, the fuse blown display device mounting structure of the present invention and the fuse with a blown display device equipped with this mounting structure can be reduced in the number of components and the manufacturing process associated therewith can be evaluated by evaluating the entire fuse with a blown display device. And cost reduction can be realized easily.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a first embodiment of a fuse blown display device mounting structure according to the present invention and a fuse with a blown display device equipped with this mounting structure. FIG. 2 is an overall perspective view of the mounting structure of FIG. 1 and a fuse with a fusing display device including the mounting structure. It is a disassembled perspective view of 2nd Example of the attachment structure which concerns on this invention, and the fuse with a fusing display apparatus provided with this attachment structure. FIG. 4 is an overall perspective view of the mounting structure of FIG. 3 and a fuse with a fusing display device including the mounting structure. 5 (a) and 5 (b) are longitudinal sectional views of the main part showing a third embodiment of the fuse blown display device mounting structure according to the present invention, and FIGS. 5 (c) to 5 (e) are views. FIG. 5 is a longitudinal sectional view of a main part of another example of the mounting structure of the fuse blown display device according to the present invention. It is a general view of the conventional fuse with a fusing display device.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be specifically described with reference to the drawings.

  FIG. 1 is an exploded perspective view of a mounting structure 50 of a fuse blown display device 3 according to the present invention and a fuse 60 with a blown display device provided with the mounting structure 50, and FIG. 2 is a mounting structure of FIG. FIG. 5 is an overall perspective view of the fuse 50 and the fuse 60 with a blown display device.

  As shown in these drawings, the fusing display device 3 mounting structure 50 of the present embodiment has the fusing display device 3 attached to both end faces of the cap body 2 at both ends of the main fuse 1.

  In FIG. 1, the main fuse 1 used in the mounting structure 50 of the present embodiment includes a fuse element 4, a cylindrical casing 5 made of an insulating material, and a conductive product fitted to both ends of the cylindrical casing 5. It consists of a cap body 2 and a number of arc-extinguishing agents 6 filled in the cylindrical casing 5.

  The fuse element 4 is for fusing within a specified time to protect an electric circuit (not shown) when an overcurrent flows. For example, a metal such as copper, copper alloy, silver, zinc, tin, etc. It consists of a fusing part 4b at the center where a plurality of small holes 4a are opened, and terminal parts 1d at both ends having attachment holes 1c.

  The cylindrical casing 5 is made of an electrically insulating material and is open at both ends. The cylindrical casing 5 surrounds the fusing part 4b of the fuse element 4 and has conductive parts such as copper, copper alloy, iron, etc. at both ends. A cap body 2 made of metal is mounted with only the terminal portion 1d of the fuse element 4 exposed to the outside.

  And the arc-extinguishing agent filling hole 7 is provided in the end surface side of each cap body 2, and many fillers 6 are beforehand filled into the cylindrical casing 5 from here.

  On the other hand, the blown display device 3 is a long and thin cylindrical connected in parallel along the axial direction of the main fuse 1, and has a fuse display fuse (not shown) and a spring (not shown) as described above. When the overcurrent flows through the fuse element 4 of the main fuse 1 and blows, the display bar 3a is projected to the outside by the action of a spring to notify.

  The mounting structure 50 of the fusing display device 3 according to the present embodiment with respect to the constituent members of the fuse 60 with fusing display device is provided with arc-extinguishing agent filling holes 7 formed in the end face of the cap body 2 and both ends of the fusing display device 3. The mounting bracket 8 includes a mounting member 8 and a fastening member 9 for mounting each mounting bracket 8 to the arc-extinguishing agent filling hole 7.

  As shown in the figure, the mounting hole 7 for fixing the mounting bracket 8 of the fusing display device 3 to the end surface of the cap body 2 is also used as the arc-extinguishing agent filling hole 7.

  The mounting fitting 8 of the fusing display device 3 is connected to the outer peripheral surface of the ring body 8a having an inner diameter through which the fusing display device 3 can be inserted, and a plate-like body 8b having an attachment hole 8c to the end surface of the cap body 2 at the end. Thus, the dimension between the end faces of the cap body 2 is fixed as the mounting interval L by appropriate fixing means (not shown) such as soldering, bonding, and screwing to both ends of the fusing display device 3. .

  In this embodiment, the mounting bracket 8 has a structure in which the ring body 8a is fixed on the fusing display device 3, but the mounting bracket 8 is clamped without using a fastening member such as a bolt or a nut, although not shown. It may be of a structure to be used, or may be of another structure.

  The arc-extinguishing agent filling hole 7 has a cylindrical casing whose inner diameter is not less than the outer diameter of the arc-extinguishing agent 6, and in this embodiment, it is easy to use a device such as a funnel (not shown). A female screw that is a through hole having an inner diameter of about 3 to 5 mm is formed so that the inside of the 5 can be easily filled.

  Therefore, the fastening member 9 also comprises a cross-shaped small screw 9a having a nominal diameter that can be screwed into the female screw, and a washer 9b. In addition, the arc-extinguishing agent filling hole 7 is not a female screw, but a simple through hole. In addition, a self-tapping screw may be employed instead of the cross-recessed machine screw. In this case, since the mounting structure 50 of the fusing display device 3 is further simplified, the productivity of the fuse 60 with a fusing display device is improved.

  According to the attachment structure 50 of the fusing display device 3 of the present embodiment, after the arc-extinguishing agent 6 is filled into the cylindrical casing 5 from the arc-extinguishing agent filling hole 7, the attachment fitting 8 is immediately attached to the filling hole 7. Since the fastening member 9 fixes the arc extinguishing agent filling hole 7 which is conventionally used, the closing member for the arc extinguishing agent 7 is not necessary, and the closing work for the filling hole 7 and the fixing work for the mounting bracket 8 are combined. Therefore, the number of components of the fuse 60 with a fusing display device can be reduced, the manufacturing process can be simplified, and the cost can be reduced accordingly.

  The thus obtained fusing display device 3 mounting structure 50 of the present embodiment constitutes the fuse 60 with a fusing display device of the completed product of FIG. 2, and an overcurrent flows through the main fuse 1 so that the fuse element 4 is blown. When the portion is blown, this overcurrent flows to the blown display device 3 via the mounting bracket 8, blows the internal blown fuse (not shown), and immediately informs the fact of the blow by protruding the display bar 3a to the outside. However, it is needless to say that the original function and effect of such a fuse with a blown display device can be exhibited.

  Next, FIG. 3 is an exploded perspective view of the second embodiment of the fusing display-equipped fuse 60A provided with the fusing display device 3 mounting structure 50A and the fusing display device 50A according to the present invention, and FIG. It is the whole perspective view of fuse 60A with a fusing display device provided with structure 50A and this attachment structure 50A. In these drawings, the same members as those in the first embodiment are denoted by the same reference numerals, and description of the members having these reference numerals is omitted.

  That is, in the mounting structure 50A of the fusing display device 3 of this embodiment and the fuse 60A with a fusing display device provided with the mounting structure 50A, the mounting bracket 8 of the mounting structure 50 of the first embodiment is fixed to both end faces of the cap body 2. In contrast to this, in this embodiment, the fastening member 9 is composed of a cross-recessed machine screw 9a and a washer 9b in the point fixed to the outer peripheral surface of the cap body 2 and the mounting structure 50 of the first embodiment. In contrast, in this embodiment, a commercially available so-called semitubular rivet 9c is used, and for this purpose, the arc-extinguishing agent filling hole 7A of this embodiment is filled with the arc-extinguishing agent of Example 1. The hole 7 is a female screw, but is different from a simple through hole having an inner diameter into which the semitubular rivet 9c can be driven.

  That is, in FIG. 3, the attachment structure 50A of the fusing display device 3 according to the present embodiment has a predetermined metal fitting 8A that folds one strip-shaped thin plate 8Aa and circulates the fusing display device 3, with both end faces facing each other. It consists of two pieces of length (attachment length between the main fuse 1 and the fusing display device 3).

  Then, mounting holes 8Ab are provided at both end faces, and the circumferential portion is soldered, bonded, screwed, etc. (not shown) to the both ends of the fusing display device 3 at a fixed interval that matches the mounting interval L1 of the arc-extinguishing agent filling hole 7A. It is fixed by.

  As described above, the inner diameter of the arc extinguishing agent filling hole 7A is an inner diameter in which the semitubular rivet 9c can be driven, and this inner diameter is usually sufficient for an operator to fill the arc extinguishing agent. The semi-tubular rivet 9c has dimensions and materials defined in JIS B 1215, and there are various materials such as plastic and metal. In this embodiment, the semi-tubular rivet 9c is electrically conductive with the mounting bracket. In order to ensure the mounting strength of the fusing display device 3, a metal such as brass, aluminum, stainless steel or the like is used, and a nominal diameter of about 3 to 5 mm is sufficient.

  FIG. 3 shows a state before the semitubular rivet 9c is driven into the cap body 2 via the mounting bracket 8B. When the mandrel 9d is folded by driving with a known rivet R which is commercially available, the following FIG. It becomes fuse 60A with a fusing display device. The details of driving the semitubular rivet 9c will be described in the third embodiment.

  According to the attachment structure 50A of the fusing display device 3 of the present embodiment, the fusing display device 3 is attached to the arc extinguishing agent filling hole 7A formed on the outer peripheral surface of the cap body 2 through the attachment fitting 8A. Since 9c is driven by the riveter R, the closing operation of the filling hole 7A and the fixing operation of the mounting bracket 8A are speeded up, and it is possible to ensure the cost reduction associated therewith.

  Also in the mounting structure 50A of the fusing display device 3 of the present embodiment obtained in this way, the fuse 60A with a fusing display device of the finished product of FIG. 4 is constituted, and there is no inferior effect of the original function of the fuse with fusing display device. It goes without saying that it can be demonstrated.

  Next, FIG. 5A and FIG. 5B are longitudinal sectional views of main parts showing a third embodiment of the mounting structure 50B of the fuse blown display device 3 according to the present invention. 5 (c) to 5 (e) are longitudinal sectional views of the main part of another example of the mounting structure, in which FIG. 5 (c) is a longitudinal sectional view in the vicinity of the cap body 2 and FIG. 5 (d). Fig. 5E is an enlarged view of the main part, and Fig. 5E is a right side view thereof.

  Also in these drawings, the same members as those in the first embodiment are denoted by the same reference numerals, and description of the members having these reference numerals is omitted.

  As shown in FIGS. 5A and 5B, the fusing display device 3 mounting structure 50B has a semi-tubular rivet 9c as a fastening member to the cap body 2 of the mounting bracket 8B as in the second embodiment. Although used, the mounting bracket 8 of the fusing display device 3 is mounted on the outer peripheral surface of the cap body 2 in the second embodiment, whereas the mounting bracket 8 of the cap body 2 is different in this embodiment. .

  Here, the attachment structure 50B of the fusing display device 3 using the semi-tubular rivet 9c will be described.

  First, as shown in FIG. 5A, after the arc extinguishing agent 6 is filled from the arc extinguishing agent filling hole 7B provided on the end face of the cap body 2, the arc extinguishing agent filling hole 7B is filled with the arc extinguishing agent filling hole 7B. A semi-tubular rivet 9c having a nominal diameter of 7B is inserted and driven by the riveter R through the mounting bracket 8B of the fusing display device 3. That is, the arc-extinguishing agent filling hole 7B becomes a pilot hole for the semi-tubular rivet 9c.

  The riveter R is driven by striking the tip in the direction of the arrow in the figure by the driving force of compressed air. However, since the riveter R is a known one, a detailed description of the structure is omitted here.

  Next, as shown in FIG. 5B, when the driving is completed and the mandrel 9d inside the semi-tubular rivet 9c is pulled out in the direction of the arrow by the riveter R, the flange portion of the mandrel 9d on the cylindrical casing 5 side. Since the diameter of 9e is increased in the radial direction, a caulking force is applied to the cap body 2 and the mounting bracket 8 so as to be sandwiched from both sides thereof.

  Next, the mandrel 9d is torn by the riveter R in the direction of the arrow in the figure, and the flange portion 9e remains in the inside of the semi-tubular rivet 9c so that the fastening is maintained.

  When such a semi-tubular rivet 9c is used as a fastening member for the mounting bracket 8B of the fusing display device 3, there is an advantage that reliable fastening is obtained and loosening after fastening such as the bolt 73 and nut 76 described in the prior art does not occur. Have

  Further, as shown in FIGS. 5C to 5E, the fastening member is provided on the projection 9f provided on the cap body 2 side and on the mounting bracket 8C side instead of the semi-tubular rivet 9c. The recess 9g may be fitted and fixed to each other.

  That is, the projecting portion 9f fixes a columnar projecting member to the end surface of the cap body 2 by soldering or the like, and has a through hole arc extinguishing agent filling hole 7C in the central portion thereof, near the tip portion on the outer peripheral surface. Is provided with a small-diameter constricted portion 9h.

  On the other hand, the concave portion 9g is a cap-shaped member that can be fitted into the protruding portion 9f of the cap body 2 and has a reduced diameter portion 9i that engages with the constricted portion 9h on the inner peripheral surface. It is located in the vicinity.

  According to the mounting structure composed of the protrusion 9f and the recess 9g, it is not necessary to prepare in advance the cross-recessed machine screw 9a of the first embodiment and the semi-tubular rivet 9c of the second embodiment.

  Therefore, the operator only has to push the concave portion 9g of the mounting bracket 8C in the direction of the protrusion 9f of the cap body 2 when fixing the mounting bracket 8C to the cap body 2, so that one-touch fixing can be realized. The closing operation of the arc-extinguishing agent filling hole 7C and the fixing operation of the mounting bracket 8C are speeded up, and the cost of manufacturing the fuse with a fusing display device can be reduced.

  The member 8e in FIG. 5 (e) is provided on the surface of the cap body 2 by attaching the recess 9g to the protrusion 9f of the cap body 2 and then bending it from both side surfaces of the mounting bracket 8C in the direction of the protrusion 9f. This is a “rotation stop” that fits into a fitting groove (not shown), thereby preventing the entire fusing display device 3 from rotating around the projection 9g.

  As described above, the mounting brackets 8B and 8C of the fusing display device 3 of the present embodiment can be mounted on both end faces of the cap body 2, and the mounting structure 50B and 50C has the same operation as that of the above-described embodiment. There is an effect.

  Although various embodiments of the present invention have been described above, these are only examples of the present invention and can be modified and applied without departing from the spirit of the present invention. Of course, it is included in the scope of the invention.

  For example, the fastening member (closing member) 9 and the semi-tubular rivet 9c used in Examples 1 and 2 are both made of a conductive material, but the cap body 2 and the fusing display device 3 are attached. The metal fittings 8 and 8A are both made of a conductive member, and when the mounting metal fittings 8 and 8A are fixed to the cap body 2 with the fastening members 9 and 9c, the current after the fusing of the main fuse 1 is provided with a fusing display device. The fastening members 9 and 9c may be made of any material, such as plastics or non-ferrous metal, as long as it can flow to the fusing display device 3 to the extent that the original function and effect of the fuse are not impaired. The case where the fastening members 9 and 9c made of material are used is also included in the scope of the present invention.

  In each of the above-described embodiments, the arc extinguishing agent filling holes 7, 7A, 7B, and 7C are examples in which only one cap is provided in the cap body 2 in order to explain the function and effect of the present invention. If the holes 7, 7A, 7B, 7C are also used as the mounting holes 8c, 8Ab of the mounting bracket 8, 8A of the fusing display device 3, for example, in the case of a fuse with a fusing display device having a large rated current, etc. Of course, two or more of them may be provided.

1 Main fuse
2 Cap body 3 Fusing display device 3a Fusing indicator rod 4 Fuse element 5 Cylindrical casing 6 Arc extinguishing agent 7, 7A, 7B, 7C Arc extinguishing agent filling hole 8, 8A, 8B, 8C Fusing display device mounting bracket 9 Fastening member 9c Semi-tubular rivet (fastening member)
9d Mandrel 50, 50A, 50B, 50C Fusing display device mounting structure (present invention)
60, 60A Fuse with blown display device (present invention)
R Riveter

Claims (4)

A fuse element; an electrically insulating cylindrical casing that surrounds a fused portion of the fuse element; an arc-extinguishing agent filled in the cylindrical casing; and a conductive cap body that seals both ends of the cylindrical casing; A fuse fusing display device that is connected in parallel to the main fuse and displays the fusing operation status of the main fuse,
Installation of a fuse blown display device characterized in that the blown display device is fixed to an arc-extinguishing agent filling hole provided in a cap body of the main fuse as a mounting hole for the blown display device. Construction. The arc-extinguishing agent filling hole is provided on an end surface of the cap body,
The fuse blown display device mounting structure according to claim 1, wherein the blown display device is fixed to the filling hole via a mounting bracket. The arc-extinguishing agent filling hole is provided on the outer peripheral surface of the cap body,
The fuse blown display device mounting structure according to claim 1, wherein the blown display device is fixed to the filling hole via a mounting bracket.   A fuse with a blown display device, comprising the mounting structure for a fuse blown display device according to any one of claims 1 to 3.

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