JP2545914Y2 - Transformer tap change tool - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer tap switching tool, and particularly to a work for switching a transformer tap.
The present invention relates to a transformer tap switching tool suitable for holding a loosened nut for fixing a tap switching bracket with a single touch and simplifying the work of switching the tap switching bracket.

[0002]

2. Description of the Related Art A general transformer is provided with a plurality of intermediate taps on a winding in order to adjust a deviation of a primary voltage from a rated voltage, and one of the taps is selected from an external drop-in wire or a lead-out wire by a tap switching fitting. The connection is made to switch the turn ratio. For example, a plurality of bolt-shaped tap terminals 12 are arranged in an insulating oil on a tap base 11 made of an insulating member shown in FIG. 4, and each of the tap terminals is connected to an intermediate tap.
2 is short-circuited and fixed by a tap switching fitting 14 to switch taps. As shown in FIG. 5, the tap changeover fitting 14 has holes at both ends for inserting the tap terminals 12, and a fixing nut 15 screwed to the tap terminal is rotated by a support fitting 16 at the position of the hole. It is assumed to be freely attached. Further, the tap terminal 12 and the tap switching fitting 14 and the like have a structure immersed in insulating oil together with the winding.

[0003]

[Problems to be Solved by the Invention] In the transformer having the above-described structure, when adjusting the tap,
Loosen the nut 15 with pliers or a spanner, remove the tap switching fitting 14 by hand, insert it into the tap terminal 12 of another combination, and tighten it again with a spanner or the like. Further, there is a possibility that the tap switching fitting 14 may be dropped into the insulating oil.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and at the time of a tap change operation of a transformer, a detached tap change fitting and a nut can be held with one touch, and a tap can be performed without touching insulating oil. An object of the present invention is to provide a transformer tap switching tool capable of performing a switching operation and preventing a nut or a tap switching fitting from dropping into insulating oil.

[0005] To achieve the above object, the present invention provides:
A rod-shaped shaft has a large-diameter gripper (2) at one end and a columnar head (3) at the other end, and a polygonal columnar shape formed on the tip end surface of the head according to the outer shape of the nut. A transformer tap switching tool having a recess (4) formed therein,
One that penetrates the side wall (5) of the head through the inner wall of the recess
A spherical bearing (7) is inserted into the through hole, and a part of the bearing projects into the recess, and a part of the bearing is formed on the outer peripheral surface of the head. It formed so that protrudes outward from and abutted against not a part of the bearing projecting from the outer peripheral surface of the head, the bearing is provided a spring for pressing the concave side, the spring, the head A ring-shaped elastic body having an inner diameter substantially the same as the outer diameter of the ring-shaped elastic body, which has a shape in which a part of the ring-shaped elastic body is cut off in the circumferential direction, and a concave portion (8a) in which the bearing engages with a circumferentially central portion of the ring-shaped elastic body And the recess (8a) of the spring ring is mounted on the outer surface of the head by contacting a part of the bearing protruding from the outer peripheral surface of the head. Characterized by .

[0006]

The recess at the tip of the head of the tool is fitted to a nut fixing the tap switching fitting immersed in the insulating oil of the transformer. At this time, the tip of the head and the shaft near the head are immersed in the insulating oil, but the grip portion of the tool is not immersed in the insulating oil.

[0007] base is fitted onto the nut in the recess of the head tip which is pressed by a spring ring is inserted into the through hole
It is firmly held within the recess of more head tip bearings. Therefore, the nut can be removed with a single touch operation of holding the tool gripping part and rotating the tool about the axis, so that hands and work clothes do not become dirty with oil, and the problem that the nut drops from the tool is eliminated. Therefore, there is no need to insert a hand into the insulating oil and remove the nut. Only
The spring ring is almost the same as the outer diameter of the head.
Part of the ring elastic body with an inner diameter cut off in the circumferential direction
Because it is formed into a shape, its spring ring
When attaching the head to the outer circumference of the head,
While spreading it out, attach it from the tip of the head, etc.
It can be easily done with one touch. Also the spring ring
A concave part is formed in the center of the inner surface of the
Spring ring rotates in the circumferential direction of the head
And displacement in the axial direction can be easily prevented.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an essential part showing one embodiment of a transformer tap switching tool of the present invention, FIG. 2 is a front view showing one embodiment of a transformer tap switching tool of the present invention, and FIG. 3 is a transformer of the present invention. It is sectional drawing which shows the state which held the nut with the tap switching tool.

In this transformer tap switching tool, a grip 1 (handle) 2 is provided at one end of a shaft 1, and a head 3 is provided at the other end (tip) of the shaft 1. Head 3
Is formed in a columnar shape as shown in FIG. 2, and a hexagonal column-shaped concave portion 4 is formed at a tip end thereof. The outer peripheral side of the hexagonal column-shaped concave portion 4 is a side wall portion 5 having a circular outer peripheral surface. Is formed. A through hole 6 is formed in the thickness direction of the side wall portion 5.

A bearing (spherical body) 7 is inserted into the through hole 6. The positional relationship between the through hole 6 and the bearing 7 is such that a part of the bearing 7 is exposed from the through hole 6 to the concave portion 4 as shown in FIG. Are exposed outside the side wall portion 5.

A spring ring 8 is provided along the circumferential direction of the side wall 5 so as to cover a part of the bearing 7 exposed from the side wall 5. At the center in the circumferential direction of the spring ring 8, a recess 8a substantially corresponding to the shape of the bearing 7 exposed to the outside from the side wall 6 is formed.
The spring ring 8 is fixed to the side wall 5 at both ends in the circumferential direction.

Next, the operation of the transformer tap switching tool having the above configuration will be described. At the time of tap switching work, the head 3 provided at the tip of the shaft 1 is inserted into the insulating oil of the transformer, and the gripper 1 is rotated with the nut of the tap switching fitting fitted in the recess 4. And remove the nut from the tap change bracket. The state at this time is shown in FIG.

In FIG. 3, a nut 9 is fitted in the recess 4, and one side of the nut 9 is pressed against the bearing ring 7. Since the bearing 7 is urged toward the center of the shaft by the spring ring 8, the nut 9 is firmly held in the recess 4 by the bearing ring 7.

The nut 9 thus held by the tool
By tightening to the tap switching fitting moved to another predetermined position, transformer tap switching can be performed. In this way, the work of loosening the conventional tap changing nut with a spanner, switching the tap by hand, and retightening with the spanner can be performed with one touch by this transformer tap changing tool, and the insulating oil of the transformer is used. There is no danger of dropping the tap switching fittings and nuts inside, and the work of searching for the tap switching fittings and nuts by putting hands in these insulating oils is eliminated.

In the above-described embodiment, a hexagonal column is particularly shown as an example of the concave portion formed in the head portion. However, the present invention can exert the same function and effect even in a polygonal column-shaped concave portion other than the hexagonal column. . The component held in the concave portion is not limited to the nut, and any component having a shape corresponding to the polygonal column-shaped concave portion formed in the head portion can be held.

[0016]

[Effects of the Invention] As described above, according to the present invention, the nut can be held with one touch from outside the insulating oil of the transformer, and the tap switching bracket can be moved to a predetermined position. Since there is no need to search for the tap changeover fittings and nuts that have fallen inside, work efficiency can be improved, and effects can be exerted on hygiene and work environment improvement of workers.

[Brief description of the drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of a transformer tap switching tool of the present invention.

FIG. 2 is a front view showing one embodiment of the transformer tap switching tool of the present invention.

FIG. 3 is a cross-sectional view showing a state where the nut is held by the transformer tap switching tool of the present invention.

FIG. 4 is a plan view illustrating an example of a tap base of a transformer.

FIG. 5 is a front view showing an example of a tap switching fitting.

[Explanation of symbols]

 1 shaft 2 gripping part (handle) 3 head 4 concave part 5 side wall part 6 through hole 7 bearing (spherical body) 8 spring ring 9 nut

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Yaegashi 36-19 Shiraiwa, Shiroiwa, Matsuzaki-cho, Tono-shi, Iwate Pref. 36-19, Shiraiwa 9th Land, Construction Division of Yurtec Tono Sales Office Co., Ltd. Tomio Kojima 36-19, Shiraiwa, Matsuzaki-cho, Tono-shi, Iwate Pref., Ltd. 36-19, Yurtec Tono Sales Office Co., Ltd. Place In the construction section (56) References Fully open sho 60-17958 (JP, U) Full open sho 60-67861 (JP, U) Full open sho 62-127773 JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A rod-shaped shaft has a large-diameter grip portion (2) at one end and a cylindrical head (3) at the other end, and is formed on a tip end surface of the head according to the outer shape of a nut. In the transformer tap switching tool in which the formed polygonal column-shaped concave portion (4) is formed , the side wall portion (5) of the head is provided on the inner wall of the concave portion.
A bearing (7), which is a spherical body, is inserted into the through-hole, a part of the bearing projects into the recess, and a part of the bearing is inserted into the recess. than the outer peripheral surface of the head is formed so that projecting outwardly and abutted against not a part of the bearing projecting from the outer peripheral surface of the head is provided with a spring for pressing the bearing in the recess side, the spring Has a shape in which a part in the circumferential direction of a ring-shaped elastic body having substantially the same inner diameter as the outer diameter of the head is cut out, and the bearing engages with a circumferentially central portion of the ring-shaped elastic body. A spring ring (8) formed with a concave portion (8a), the concave portion (8a) of the spring ring being brought into contact with a part of the bearing protruding from the outer peripheral surface of the head to be mounted on the outer periphery of the head. Become Transformer tap-changing tool that characterized the door.