JPS6142276Y2 - - Google Patents

Description

[Detailed description of the invention] (A) Industrial application field The present invention relates to an improvement of the fuse holding mechanism of a butt holder used for a power distribution lead-in line.

(B) Prior Art As shown in FIG.
A stepped hole 23 having a stepped portion 22 at the bottom is provided, and a threaded portion 25 is provided below the rod 26 in the stepped hole 23.
A tightening bolt 29 has a resin hexagonal head 27 and a spring fitting step 24 molded with resin coating on the upper part, and a spring 28 is interposed between the resin step 22 and the spring fitting step 24. In the fuse gripping part 33, two washers 30 and 31 are screwed and loosely fitted into the rod 26 protruding from the resin step part 22 of the boss part 21 from the screw part 25. When installing the fuse, remove the fuse gripping part 33 from the fuse holder main body 32 and push the tightening bolt 29 against the spring 28. The washers 30 and 31 overlap and loosely fit on the rod 26. It is difficult to insert fuse 34 between washers 30 and 31. In addition, since the resin stepped portion 22 is interposed between the tightened portions of the fuse, this resin portion may naturally deteriorate during long-term use, or the screw portion may loosen due to embrittlement due to heat cycles, resulting in poor contact. There was concern that it would burn out.

Next, as shown in FIG. 4, between the upper plate 37 and lower plate 38 of the U-shaped hardware 35, the resin step 22 and the flange-shaped washer 36 are inserted by the elasticity of the spring 28.
In the fuse gripping portion 33 having a sandwiched structure,
The fuse 34 is sandwiched between the lower plate 38 of the U-shaped hardware 35 and the flange-shaped washer 36, but it is difficult to push the U-shaped hardware 35 downward against the elasticity of the spring 28 with one hand; The gap between the lower plate 38 and the flange-shaped washer 36 is narrow, and the flange-shaped washer 36 overlaps with the lower plate 38 and lowers, leaving no gap, making it difficult to insert the fuse 34.

Furthermore, if the resin stepped portion 22 becomes brittle and breaks due to natural deterioration or heat generation during use, there is a fear that the tightening may loosen and lead to poor contact and burnout.

(C) Problems to be solved by the invention The present invention eliminates the presence of resin parts between the tightening parts of the existing ones as mentioned above.
In addition to preventing embrittlement due to natural deterioration and heat cycles, it also makes it easier to replace the fuse. Even if the resin part is damaged during use, the contact part will not loosen, and even if the resin head is damaged. It was also developed to have a removable structure.

(D) Means for resolving the problem. The following means for solving the problem will be explained with reference to the drawings.

As shown in FIG. 1 and FIG. 2C, there is a metal cylinder 1 having a through hole 3 smaller than the inner diameter of the cylinder at the bottom 4 and a collar 2 at the top of the cylinder, and a retainer 10 that fits into the metal cylinder 1. The polygonal part 9 has a large circular neck part 17 and a small circular neck part 8 that is inserted through the through hole 3 of the metal cylinder 1 at the lower part of the polygonal part 9, and a screw part 6 that is screwed onto the fuse holder main body 5 at the lower end. The polygonal part 9 has a hexagonal head 12, a flange 11, and a cylindrical part 7, and a holder bolt 50 coated with a resin insulation coating, and a washer in which a screw part 6 is loosely fitted into the small circular neck part 8 of the holder bolt 50. 13, and an insulating resin part 60 integrally molded with a metal cylindrical fitting part 14 into which the metal cylinder 1 is loosely fitted and which has a catch part 15 of the collar 2 on both sides of the arch part 16. The metal cylindrical fitting part 14 of
The metal cylinders 1 are respectively fitted to the metal cylinders 1, and both metal cylinders 1 are fitted together.
Attach the holder bolt 50 to its large and small round necks 17 and 8.
A fuse gripping portion is formed by inserting and fitting a spring 41 into the spring 41, and fitting a washer 13 loosely through the screw portion 6 into a small circular neck portion 8 protruding from the through hole 3 against the elasticity of the spring 41. This fuse holder is composed of a fuse holder body 5 and a fuse holder body 5 which are screwed together.

Note that if the ring 39 is tightly attached to the small circular part 8 into which the washer 13 is loosely screwed from the threaded part 6, the washer 13 will not be screwed out from the threaded part 6.

(E) Function To use the present invention, remove the fuse gripping part of the present invention from the fuse holder main body 5 as shown in FIG. A gap is created between the bottom part 4 and the washer 13, so when one terminal of the fuse 34 is inserted into this gap and the push is released, the fuse is sandwiched between the bottom part 4 and the washer 13. Similarly, by sandwiching the other terminal of the fuse 34 between the bottom 4 of the other metal cylinder 1 and the washer 13 of the fuse gripping part, the fuse can be easily gripped by the fuse gripping part.

Next, hold this fuse gripping part by its arch part 16 and apply it to the fuse body 5 as shown in FIG. When the hexagonal head 12 is rotated and screwed in, the bottom part 4 of the metal cylinder 1 is connected to the terminal of the fuse holder body 5 together with the fuse 34 and washer 13 by the lower part 40 of the large circular neck part 17 of the holder bolt 50. 19, the fuse 34 is pressed against the terminal part 1.
9 is securely connected.

(F) Effect of the invention As mentioned above, in this invention, the fuse 34
is held by the fuse gripping part when installing it, but if the holder bolt 50 is pushed slightly downward at that time, the metal cylinder 1 will stop with its collar 2 hooking on the hooking part 15, and only the washer 13 will move downward. Since the fuse 34 can be opened by going down, insertion of the fuse 34 is very easy. In the conventional model, the two washers move together, so there is no gap for insertion.
It was difficult to insert the fuse.

Next, in conventional fuse gripping parts, the insulating part of the fuse gripping part is partially held between the fuse gripping parts, so this resin part can become brittle due to aging or heat cycles during use. However, in the present invention, there is no resin in the clamping part of the fuse, and there is no resin between the metal cylinder 1 and the metal washer 13. To,
Because of the structure in which the fuse 34 is sandwiched, there is no risk of poor contact or burnout due to natural deterioration or embrittlement due to heat. Also, if the temperature of the contact area rises due to weak tightening or overload, etc.,
Since the metal cylinder 1 has a large surface area and has a heat dissipation effect, it has the effect of protecting the insulating resin parts such as the metal cylinder fitting part 14 from heat. Furthermore, even if the resin hexagonal head 12 of the holder bolt 50 is damaged, the metal polygonal part 9 can be loosened with an adjustable wrench or the like, so the fuse gripping part can be replaced. It has many excellent effects.

(G) Other Embodiments In addition to the embodiment shown in FIG.
It can also be applied to fuse gripping parts of other shapes.

[Brief explanation of drawings]

1 and 2 are illustrative partial sectional views of the present invention, and FIGS. 3 and 4 are illustrative partial sectional views of conventional fuse holders. 1 is a metal cylinder, 2 is a flange of the metal cylinder 1, 3 is a through hole, 4 is a bottom part, 5 is a fuse holder body, 6
1 is a threaded portion of the holder bolt 50, 7 is a resin cylindrical portion, 8 is a small round neck, 9 is a polygonal portion, 10 is a retainer, 11 is a resin collar, 12 is a hexagonal resin head, 13 is a metal 14 is the insulating resin part 6
0 metal cylindrical fitting part, 15 the same latching part, 16 the same arch part, 17 the great circular neck part, 18 the screw part, 19
20 is a terminal portion of the fuse holder main body 5, 20 is a knob, 21 is a boss portion, 22 is a resin step portion, 23 is a stepped hole, 24 is a spring fitting step portion, 25 is a screw portion, 26 is a rod, and 27 is a head. 28 is a spring, 29 is a tightening holder, 30 is a washer, 31 is a washer, 32 is a fuse holder, 33 is a fuse gripping part, 34 is a fuse, 35 is a U-shaped hardware, 3
6 is a flange type washer, 37 is an upper plate, 38 is a lower plate, 39 is a ring, 40 is a lower part, 41 is a spring, 50 is a holder bolt, and 60 is an insulating resin part.

Claims (1)

[Claims for Utility Model Registration] A metal cylinder 1 having a through hole 3 smaller than the inner diameter of the cylinder in the bottom part 4 and a flange 2 in the upper part of the cylinder, and a large circular neck part 17 in the lower part of the polygonal part 9 having a retainer 10. It has a small circular neck part 8 that is inserted through the through hole 3 of the metal cylinder 1, and a screw part 6 that is screwed onto the fuse holder body 5 at the lower end, and the polygonal part 9 has a hexagonal head 12, a collar 11, and a cylinder A holder bolt 50 coated with a resin insulating coating consisting of a section 7, a washer 13 loosely fitted with a threaded section 6 screwed into a small circular neck section 8 of the holder bolt 50, and a metal cylinder 1 loosely fitted to both ends of an arch section 16. It consists of an insulating resin part 60 which is integrally molded with a metal cylindrical fitting part 14 having a hook part 15 of a fitting collar 2, and the metal cylinder 1 is fitted into both metal cylindrical fitting parts 14 of the insulating resin part 60, respectively. Then, a holder bolt 50 is inserted into both metal cylinders 1, a spring 41 is inserted into the large and small circular neck portions 40, 8, and the small circular neck portion 8 protrudes from the through hole 3 against the elasticity of the spring 41. This fuse holder consists of a fuse gripping part in which a washer 13 is loosely fitted from a threaded part 6 into one body, and a fuse holder main body 5 to which this is screwed together.