JP2589247Y2 - Cut-out fuse cylinder holding structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cut-out fuse cylinder holding structure.

[0002]

2. Description of the Related Art Conventionally, as a structure for holding a fuse cylinder of this type, the structure described in JP-A-63-141232 can be mentioned. In this cutout, a part of the electrode arranged in the opening of the fuse cylinder insertion hole is used as an elastic terminal piece, and the end of the fuse cylinder is hooked by the elastic terminal piece to prevent detachment from inside the insertion hole. It has become.

[0003]

However, the above-mentioned elastic terminal piece is made of a thin metal plate to provide elasticity, and its strength is not so high. Therefore, if the fuse cylinder is pulled out in a state where the hook of the elastic terminal piece is not released for some reason, the pulling force may be directly applied to the elastic terminal piece and deformed.

An object of the present invention has a sufficient strength, is to provide a fuse tube holding structure of the cut-out capable of preventing breakage at the time of detachment of fuse tube in advance.

[0005]

According to the present invention, there is provided a cutout in which a fuse cylinder is detachably inserted into a fuse cylinder insertion hole formed in a main body insulator, the fuse cylinder being disposed at an opening of the fuse cylinder insertion hole. And a stopper member held in each of the holding holes so as to be able to protrude and retract into the stopper cylinder, And a biasing member for biasing each of the stopper members in the protruding direction and engaging with the end of the fuse cylinder.

[0006]

When the fuse cylinder fixed to the operation rod is inserted into the fuse cylinder insertion hole when mounting the fuse cylinder, each stopper member is withdrawn from the inside of the prevention cylinder at the outer periphery of the fuse cylinder, and when the insertion is completed. Each stopper member again projects into the detachment prevention cylinder to prevent the fuse cylinder from being detached.

Further, when the engaging portion of the operating rod is engaged with the engaging portion of the fuse cylinder when removing the fuse cylinder, the pressing portion provided on the operating rod comes into contact with the stopper member, and the urging member of the urging member is disengaged. Each stopper member is withdrawn from the separation prevention cylinder against the urging force. Accordingly, the engagement of the stopper member with the fuse cylinder is released, and when the operation rod is pulled in this state, the fuse cylinder can be pulled out from the cutout.

On the other hand, as described above, each stopper member protrudes into the disengagement prevention cylinder by the urging force of the urging member. In order to perform this protruding operation, for example, the thickness is reduced. Thus, no elasticity is imparted to the stopper member itself. Therefore, each stopper member is maintained at a high strength. Each stopper member is firmly positioned because it is held in the holding hole.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a cutout for direct attachment will be described below with reference to the drawings.

As shown in FIG. 2, a through hole 2 is formed in a main body case 1 of a transformer arranged in a distribution line, and a main body insulator 3 is inserted into the through hole 2 from outside the main body case 1. Have been. A flange 3a is formed on the main body insulator 3, and the main body insulator 3 is fixed to the main body case 1 of the transformer via a plurality of bolts 4 via the flange 3a. A fuse cylinder insertion hole 5 is formed in the main body insulator 3 from the outer end, and a large-diameter accommodation hole 7 is formed in the opening of the fuse cylinder insertion hole 5 via a step surface 6.

A cap nut 8 is embedded and fixed at the inner top of the fuse tube insertion hole 5, and an electrode holding member 10 is fixed by a bolt 9 screwed to the cap nut 8. The electrode holding member 10 holds a tulip-shaped upper electrode 11. The cap nut 8 is connected to a lead wire connecting portion 13 via a conductive rod 12.
3 is connected to the primary coil side of the transformer.

On the other hand, in the receiving hole 7, a detachment prevention cylinder 14 is provided.
The flange portion 14 a of the detachment prevention cylinder 14 is fixed to a plurality of cap nuts 15 embedded and fixed on the step surface 6 by bolts 16. The inside of this cylinder 14 communicates with the inside of the fuse insertion hole 5, and the inside of the cylinder 14 expands toward the opening side of the accommodation hole 7 to facilitate insertion of a fuse cylinder 25 described later. Is formed. The cap nut 15 and the flange 14
The electrode plate 17 is sandwiched between the electrodes a. The four lower electrodes 18 attached to the electrode plate 17 are arranged at equal intervals in the fuse tube insertion hole 5. Further, one of the cap nuts 15 is connected to a connection terminal 20 provided on the body insulator 3 via a conductive rod 19, and a power supply side lead wire (not shown) is connected to the connection terminal 20. I have.

As shown in FIG. 3 and FIG.
Four holding holes 21 are respectively provided at four equally-spaced portions on the outer periphery of 4. A stopper member 22 is held in each holding hole 21, and each stopper member 22 can move in a direction orthogonal to the axis of the separation preventing cylinder 14. A garter spring 23 as an urging member is provided on the outer circumference of the detachment prevention cylinder 14.
The garter spring 23 abuts in a concave portion 22 a formed outside each stopper member 22 to urge each stopper member 22 in the axial direction of the detachment prevention cylinder 14. As a result, in a state where the step portions 22b formed on the respective stopper members 22 are in contact with the outer peripheral surface of the separation preventing cylinder 14,
One side of each stopper member 22 protrudes into the separation prevention cylinder 14. A sliding contact surface 24 is formed obliquely on this protruding portion so as to face the opening side of the fuse cylinder insertion hole 5.

As shown by phantom lines in FIG. 2, a fuse tube 25 having a male screw 25a as an engaging portion formed at an outer end is disposed in the fuse tube insertion hole 5 of the main body insulator 3.
The fuse cylinder 25 is connected to the upper and lower electrodes 11 and 18.
As described above, it is hooked by the stopper member 22 protruding into the accommodation hole 7 to prevent it from being released outward (toward the opening of the accommodation hole 7).

A hermetic plug 26 is detachably attached to the opening of the accommodation hole 7, and a male screw 26a having the same size as the male screw 25a of the fuse cylinder 25 is integrally formed on the surface of the hermetic plug 26. When the fuse cylinder 25 is attached or detached,
An operation rod 28 is screwed into the male screw 26a of the hermetic plug 26, and the hermetic plug 26 is attached and detached. The fuse tube 25 projects a red striker 27 from a male screw at the time of fusing, and the hermetic plug 26 is made of a transparent resin so that the striker 27 can be visually recognized from the outside.

Next, a description will be given of a case where the thus constructed fuse tube 25 of the cut-out for direct attachment is attached and detached. First, when attaching the fuse cylinder 25 to the cutout, the male screw 25a of the fuse cylinder 25 is connected to the operation rod 28.
And the fuse tube 25 is fixed. When the insertion of the fuse tube 25 into the detachment prevention tube 14 of the main body insulator 3 from which the hermetic plug 26 has been removed in advance starts, the fuse tube 25
Is in sliding contact with the sliding contact surface 24 of each stopper member 22, and each stopper member 22 is retracted from the separation prevention cylinder 14 against the urging force of the garter spring 23.

Then, as shown in FIG.
When the insertion of the stopper tube 5 is completed, each stopper member 22 projects again into the disengagement prevention tube 14 by the urging force of the garter spring 23 and is positioned outside the fuse tube 25, and is located outside the fuse tube 25 (the opening of the accommodation hole 7). Part side) is prevented. At this time, the upper and lower electrodes 11 and 18 of the main body insulator 3 are electrically connected to the fuse tube 15 so that the power supply and the primary coil of the transformer can be energized. Next, as shown in FIG. 4, the operation rod 28 is rotated to release the screw engagement with the fuse cylinder 25, and then the sealing plug 26 is attached to the main body insulator 3, whereby the attachment of the fuse cylinder 25 is completed.

When the fuse tube 25 attached as described above is to be removed from the cutout, first, a pressing member for pressing each stopper member 22 to the tip of the operating rod 28 is used.
The main body insulator 3 with the sealing plug 26 and the sealing plug 26 removed in advance
The tip of the operation rod 28 is inserted into the detachment prevention cylinder 14. Then, as shown in FIG.
Is screwed into the male screw 25a of the
8 gradually moves forward. As a result, the pressing member 2
At 9, each stopper member 22 is retracted from the inside of the separation prevention cylinder 14 against the urging force of the garter spring 23 and expands larger than the outer diameter of the fuse cylinder 25. In this state, when the operating rod 28 is pulled, the fuse cylinder 25 Can be pulled out of the cutout.

On the other hand, as described above, each stopper member 22
Is the release prevention cylinder 14 by the urging force of the garter spring 23.
The stopper member 22 itself is not elasticized by, for example, reducing the thickness thereof in order to perform the projecting operation. Therefore, each stopper member 22 is maintained at a high strength. Each stopper member 22 is firmly positioned because it is held in the holding hole 21.

As described above, in the cutout of the present embodiment, the detachment preventing cylinder 14 which is disposed at the opening of the fuse cylinder insertion hole 5 and communicates with the insertion hole 5 and penetrates the outer periphery of the detachment preventing cylinder 14. The four holding holes 21 provided, the stopper members 22 held in the respective holding holes 21 so as to be able to protrude and retract into the detachment prevention cylinder 14, and the respective fuse members 25 And a garter spring 23 to be hooked on the end of the garter.

Accordingly, when the fuse cylinder 25 is mounted, the stopper members 22 themselves are not provided with elasticity, so that each stopper member 22 can be maintained at a high strength, and each stopper member 22 is held in the holding hole. Therefore, the positioning can be firmly performed. Therefore, even when the fuse cylinder 25 is pulled out in a state where the engagement of the stopper member 22 is not completely released for some reason, the stopper member 22 withstands the external force applied by the interference with the fuse cylinder 25 and prevents damage beforehand. Can be prevented.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the present invention is embodied as a directly attached cut-out fuse cylinder holding structure which is directly attached to the main body case 1 of the transformer. However, the present invention may be embodied in a fuse-cylinder holding structure having a cylindrical cutout installed at a different position from the transformer.

In the above embodiment, four stopper members 22 are provided on the detachment prevention cylinder.
Two may be provided. Further, in the above embodiment, each stopper member 22 is urged by one garter spring 23, but each stopper member 22 may be urged by a separate spring.

[0024]

[Effects of the Invention] As described in detail above, the cut-out fuse cylinder holding structure of the present invention has sufficient strength,
An excellent effect of preventing damage at the time of removing the fuse cylinder beforehand is exhibited.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a cutout.

FIG. 2 is a sectional view of the cutout.

FIG. 3 is a front view of a detachment prevention cylinder.

FIG. 4 is a partial cross-sectional view of the cutout when the mounting of the fuse cylinder is completed.

FIG. 5 is a partial cross-sectional view of a cutout when a fuse cylinder is mounted.

[Explanation of symbols]

 3 Body Insulator 5 Fuse Cylinder Insertion Hole 14 Detachment Prevention Cylinder 21 Holding Hole 22 Stopper Member 23 Garter Spring as Energizing Member 25 Fuse Cylinder 25a Male Thread as Engaging Part 28 Operating Rod

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Osamu Nagasaki 2-1-1-11 Tagawa, Yodogawa-ku, Osaka Dainai Co., Ltd. (72) Inventor Toshiharu Otsuka 1st character small needle in Inuyama-shi, Aichi Energy Support Co., Ltd. (56) References JP-A-63-141232 (JP, A) JP-A-51-129740 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01H 85/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A cutout in which a fuse cylinder (25) is made detachable from a fuse cylinder insertion hole (5) formed in a main body insulator (3), and is disposed at an opening of the fuse cylinder insertion hole (5). A release prevention cylinder (14) communicating with the insertion hole (5), a plurality of holding holes (21) penetrating the outer circumference of the release prevention cylinder (14), and an inside of the release prevention cylinder (14). A stopper member (22) held in each of the holding holes (21) so as to be able to protrude and retract, and urge each of the stopper members (22) in a protruding direction to an end of the fuse cylinder (25). The urging member (2
3) A cut-out fuse-cylinder holding structure, comprising: