JP3184357B2 - Mounting method of protective cover for exposed conductor of insulated wire and mounting 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 conductor exposed portion of an insulated wire for covering a conductor exposed portion from which an insulator of an insulated wire is peeled with a protective cover which is larger than the conductor exposed portion and is wound in a cylindrical shape. The present invention relates to a method for mounting a protective cover for a part and a tool for mounting the same.

[0002]

2. Description of the Related Art In general, in live-line work of a high-voltage insulated wire, a three-phase short-circuit grounding tool (hereinafter, referred to as "hereafter") is used to prevent electric shock.
It is called a "grounding tool." ) To ground the high voltage insulated wire to the ground. Such a grounding tool is composed of three ground wires using insulated wires, and the conductor exposed portions at one ends of the three ground wires are respectively connected to the conductor exposed portions of the three high-voltage insulated wires from which the insulator has been peeled off. A ground rod connected to the other end of the ground wire is inserted into the ground to ground.

[0003] In such a grounding tool, after the hot wire operation of the high voltage insulated wire is completed, one end of the grounding wire is removed from the exposed conductor, and the exposed conductor is covered with a protective cover 1 as shown in FIG. Has recovered. The protective cover 1 is made of a flat rubber-like elastic body wound like a cylinder, and is attached to the exposed conductor by a cover inserter 2 as shown in FIG. The cover inserter 2 includes a pipe main body 3 formed in a bent shape and a pipe main body 3.
And a grip 5 formed of an insulating material at the base of the pipe body 3. A slit 5 is provided on the upper surface of the front end of the pipe body 3 to extend to a bent portion. On both sides of the slit 5, the protective cover 1 is prevented from rotating. Is formed.

[0004] When the conductor exposed portion is covered with the protective cover 1, first, the tip of the pipe body 3 of the cover inserter 2 is inserted into the center hole of the protective cover 1, as shown in FIG. 9. As described above, the holes are pushed open while supporting both end edges of the protective cover 1 at the folded portions 6, and the protective cover 1 is opened and held in a gutter shape. Next, as shown in FIG.
The cover inserter 2 is applied to the high-voltage insulated wire 7 so that the slit 5 provided in the pipe main body 3 faces the exposed conductor 8. Thereafter, the protective cover 1 is manually shifted and fitted while the cover inserter 2 is being pulled out, and the conductor exposed portion 8 is covered with the protective cover 1 by utilizing its own restoring force.

[0005]

However, in such a conventional method of attaching a protective cover using a cover inserter, the work of covering the high-voltage insulated wire requires a safe separation distance from the high-voltage insulated wire. Since it was a direct hot-line operation that could not be taken, not only did various protection measures for ensuring the safety of workers become necessary, but also the workability was poor.

That is, since the direct hot-line operation is an operation in which an operator directly touches the electric wire, it is necessary to ensure the safety of the operation. Therefore, it is necessary to take protective measures around the electric wire and the electric pole near the work place. In addition, workers are required to wear protective equipment such as high-pressure insulating rubber gloves, rubber boots, and insulating clothing. Therefore, not only time is required for indirect work such as protective measures and wearing of protective equipment as described above, but also work is impaired when rubber gloves or the like are worn, resulting in poor workability. In particular, when the protective cover 1 is hardened by the temperature, such as in winter when the temperature drops, it becomes difficult to perform the work of inserting the protective cover 1 into the cover inserter 2 and the subsequent shifting work, and the above-mentioned covering work becomes more difficult. The present invention has been made in view of such a conventional problem, and solves the above-mentioned problem by securing a sufficiently safe distance between a high-voltage insulated wire and a protective cover. It is intended to be.

[0007]

In order to achieve the above object, the present invention provides a method for mounting a protective cover for a conductor exposed portion of an insulated wire, comprising the steps of: In a method for mounting a protective cover for a conductor exposed portion of an insulated wire which covers a protective cover which is larger than the exposed portion and is wound in a cylindrical shape, the outer end of the protective cover is fixed, and a center pin is inserted into a center hole of the protective cover. The protective cover is opened by inserting and moving in a direction away from the fixed side, and after the opening surface of the protective cover is exposed to the conductor exposed portion, the center pin is further moved in the direction in which the center pin is moved away. When the engagement of the protective cover with the center pin is released, the protective cover is wound by the restoring force of the protective cover to cover the exposed conductor.

Further, in the mounting tool according to the present invention, the outer end of the protective cover, which is fixed to the tip of the insulating tube and is larger than the exposed portion of the conductor from which the insulator of the insulated wire is peeled off, is wound in a cylindrical shape. A cover fixing plate having a locking hole to be inserted, a cover opening plate having a detachable center pin inserted through a central hole of the protective cover, and being held on the cover fixing plate so as to be movable forward and backward. A lock for fixing the outer end of the protective cover between the operating lever, which is swingably attached to the base of the insulating tube and connected to the cover opening plate via a connecting rod, and the cover fixing plate. A lock mechanism having a plate at the tip and an operation unit for moving the lock plate forward and backward is provided at a base of the insulating tube.

[0009]

The outer end of the protective cover is inserted into the locking hole of the cover fixing plate provided at the end of the insulating tube, and the outer end is fixed by the lock plate of the lock mechanism. Then, the center pin is inserted into the center hole of the protective cover, and the cover opening / closing plate for detachably holding the center pin is moved in a direction away from the fixed side by swinging the operation lever to open the protective cover.

Next, holding the insulating tube, the opening of the protective cover is made to face the exposed conductor of the insulated wire from which the insulator has been peeled off.
Further, the center pin is moved in the direction away from the center pin through the operation of the operation lever to release the engagement of the protective cover. As a result, the inner end of the protective cover comes off the center pin, and the inner end is wound around the exposed conductor by its own restoring force.

Then, by operating the operating portion of the lock mechanism to retract the lock plate, the engagement of the outer end of the protective cover fixed to the cover fixing plate is released. Thereafter, the insulating tube is tilted and the outer end of the protective cover is pulled out from the locking hole. As a result, the outer end of the protective cover is disengaged from the engagement hole, and the outer end is wrapped around the inner end by its own restoring force, and thus the protective cover can be attached to the exposed conductor.

[0012]

Next, embodiments of the present invention will be described with reference to the drawings. 1 to 6 show an embodiment of the present invention. First, the structure will be described. As shown in FIGS. 1 to 3, reference numeral 10 denotes a cover fixing plate.
No. 0 has a T-shape in plan view, has a wide top with an elongated locking hole 11 extending in the width direction, and forms guide pieces 12 projecting downward on both side surfaces of the top. I have. A bearing block 13 is fixed to the base upper surface of the cover fixing plate 10, and the bearing block 13 is provided with a hole 14 penetrating in the vertical direction. A first connecting rod 15 is slidably inserted into a hole 14 of the bearing block 13, and a cover opening plate 16 is provided at the end of the first connecting rod 15.
Are connected.

The cover opening plate 16 is a strip-shaped plate piece 17, pin receiving pieces 18 and 19 fixed to both ends of the plate piece 17 in the longitudinal direction, and a fixed piece fixed to a middle part in the longitudinal direction. And a pin hole 22 through which a center pin 21 passes. Further, one of the pin receiving pieces 19 has a pin hole 22 therein.
A screw hole 23 intersecting with the screw hole 23 is provided, and a retaining screw 24 is screwed into the screw hole 23. A claw 25 is formed at the tip of the retaining screw 24, and the claw 25 is engaged with an annular groove 26 provided at the tip of the center pin 21 to prevent the center pin 21 from coming off.

The tip of the first connecting rod 15 is fixed to the fixing piece 20 of the cover opening plate 16.
A joint piece 28 of a universal joint, which is tiltably connected by a screw 27, is fixed to the base end of the joint 5. A distal end of a second connecting rod 30 is fixed to the other joint piece 29 of the universal joint, and a similar joint piece 31 is fixed to a base end of the connecting rod 30. The joint piece 31 is rotatably connected to an operation lever 33 by a pin 32. 34 is
This is a retaining ring that is engaged with both ends of the pin 32 to prevent the operation lever 33 from coming off.

The operating lever 33 has a knob 35 fixed to the upper end by a shaft, and leg pieces 36 and 37 which are parallel to each other at a predetermined interval and project downward.
A base block 38 is interposed between 6 and 37.
A rotating shaft 39 is attached to both leg pieces 36 and 37 and the base block 38.
Penetrates, whereby the operation lever 33 is configured to be swingable about the rotation shaft 39 as a rotation center. Further, one leg piece 36 is provided with a screw hole 40, and a fixing screw 41 is screwed into the screw hole 40. The base block 38 includes a pair of block pieces 4 having semicircular grooves.
2, 43, and a side plate 44 fixed to the outside of one of the block pieces 42, and the side plate 44 has an arc-shaped long hole 45 centered on the rotation shaft 39. A slide pin 41a held at the tip of a fixing screw 41 so as to be able to move forward and backward is inserted into the long hole 45, and the slide pin 41a protrudes into a plurality of holes provided at predetermined positions of the block piece 42 corresponding to the long hole 45. As a result, the operation lever 33 can be fixed at a predetermined angle as shown by reference numerals a to d in FIG. 46 is a rotating shaft 39
Are engaged with both ends of the rotary shaft 39 to prevent the rotation shaft 39 from coming off.

An insulating tube 48 is provided in the through hole 47 formed by the combination of the semicircular grooves of the pair of block pieces 42 and 43 to maintain a predetermined distance from the cover fixing plate 10 and enable remote operation. Penetrates. The insulating tube 48 is formed of an insulating material such as plastic having an insulating property, and has an L-shaped guide hole 49 formed at an end thereof for fixing a head block described later. 5
Reference numeral 0 denotes a collar for protecting a worker's hand.

A through rod 52 having an insulating grip 51 at the base end is inserted through the insulating tube 48. A hexagonal hole 53 extending in the axial direction is provided at the tip of the penetrating rod 52, and a hexagonal part 55 provided at the base end of the operating rod 54 is fitted into the hexagonal hole 53, whereby the operating rod 54 and the penetrating rod 52 are fitted. And are integrated in the rotation direction. The operation rod 54 is rotatably fixed to a hole 57 of a cylindrical head block 56, and has a screw portion 58 at the tip. Reference numeral 59 denotes a washer inserted into the screw portion 58.

The head block 56 is provided with a lock pin 60 projecting inward and outward in the radial direction. The inner end of the lock pin 60 is engaged with an annular groove 61 provided in the operation rod 54, and the operation rod The movement of the shaft 54 in the axial direction is limited so that only the rotational movement is possible. The outer end of the lock pin 60 is fitted into the guide hole 49 of the insulating tube 48, whereby the insulating tube 48 and the head block 56 are integrally fixed. The head block 56 has a bracket 61 fixed to the end, and the head block 56 is fixed to the back surface of the cover fixing plate 10 by a screw 62 whose screw portion is screwed into the bracket 61 from the lateral direction. . A cap 63 is inserted into the hole 57 of the head block 56 so as to be slidable in the axial direction. A lock plate 65 is fixed to a flange provided at the tip by a screw 64. The lock plate 65 can move forward and backward so as to open and close the locking hole 11 by being guided by guide pieces 12 provided on both sides in the width direction of the cover fixing plate 10.

The penetrating rod 52, the operating rod 54, the head block 56, the cap 63, and the lock plate 65 constitute a lock mechanism for locking the outer end of the protective cover 1. The structure of the protective cover 1 for covering the exposed conductor of the high-voltage insulated wire from which the insulator has been peeled off is the same as the conventional one shown in FIG.

Next, the operation will be described. When setting the protective cover 1 to this mounting tool, first, FIG. 4 (a),
As shown in (b), the outer end of the protective cover 1 is inserted into the locking hole 11 of the cover fixing plate 10, and the outer end is locked by the lock plate 65 of the lock mechanism. This locking operation is performed by inserting the outer end of the protective cover 1 into the locking hole 11 and then inserting
The operation can be performed by rotating the operation rod 54 by turning the grip 51. That is, when the operation rod 54 is rotated,
Since the operation rod 54 is restricted from moving in the axial direction by the lock pin 60 and can only rotate,
The rotation of the screw portion 58 of the operation rod 54 causes the cap 63 to relatively move in the axial direction. As a result, the lock plate 65 fixed to the cap 63 moves forward integrally, and the cover fixing plate 1
Lock the outer end of the protective cover 1 between 0 and 0.

Next, after removing the center pin 21 from the cover opening plate 16, the operating lever 33 is tilted forward to the position a, and the two connecting rods 15, 30 and the three joint pieces 28, 2
The cover opening plate 16 connected to the protection cover 1 is moved forward by the cover opening plate 16 connected to the protection cover 1 via the protection cover 9. Then, as shown in FIG. 5, the center pin 21 is inserted into the center hole of the protective cover 1 through the pin hole 22 of one pin receiving piece 19, and the other pin receiving piece 1 is inserted.
A screw 24 is screwed into the screw hole 23 of No. 8 to prevent the center pin 21 from coming off.

Then, as shown in FIG. 2, the operating lever 33 is raised to the position "b" if the protective cover 1 is small and to the position "c" if the protective cover 1 is large according to the size of the protective cover 1, and the cover is opened. The plate 16 is retracted. Then, the retreating movement of the center pin 21 causes the protective cover 1 to be spread in a plane as shown in FIG. In this case, the operation lever 33 is locked at the position b or c by the fixing screw 41. Thereafter, holding the insulating tube 48, the opening surface of the protective cover 1 is made to face the exposed conductor of the high-voltage insulated wire. Next, the operation lever 33 is further raised to the d position, and the center pin 21 is moved in a direction away from the fixing portion of the protective cover 1 to release the engagement of the protective cover 1. Thereby, the inner end of the protective cover 1 is
As a result, the inner end is wound around the exposed conductor due to its own restoring force due to the material of the protective cover 1.

Next, the grip 51 of the lock mechanism is rotated in a direction opposite to the above-mentioned rotation direction, and the screw portion 58 of the operation rod 54 is rotated.
The cap 63 is retracted by the reverse action of. As a result, the lock plate 65 is retracted, and the engagement of the outer end of the protective cover 1 is released. Thereafter, the outer end of the protective cover 1 is pulled out from the locking hole 11 by tilting the insulating tube 48. as a result,
The outer end is disengaged from the engaging hole 11 and wraps around the inner end by its own restoring force, whereby the protective cover 1 can be attached to the insulated wire, and the exposed conductor is covered with the protective cover 1.

In the above-described embodiment, an example in which the exposed conductor of the high-voltage insulated wire is covered with the protective cover 1 has been described. However, the present invention is not limited to this. Of course, it can be applied to coating.

[0025]

As described above, the present invention is configured as described above, and has the following effects. A cover fixing plate, etc., that allows the protective cover to be detachably fixed, is provided at the tip of the insulating tube, and the protective cover can be spread out and removed by hand work on the insulating tube. Can be attached to the exposed portion of the conductor, and an indirect hot-line operation safe for the operator can be realized. Therefore, it is possible to eliminate indirect work such as protective measures for electric wires and the like in the vicinity of the work place and wearing of protective equipment for workers, which were required in the conventional work,
The work of covering the protective cover can be performed safely and reliably in a short time, and the workability of this kind of construction can be greatly improved. In addition, since the work of disengaging the protective cover by spreading it can be performed mechanically, the burden on the worker is increased even when the protective cover is hardened due to temperature, such as in winter when the temperature decreases. Therefore, the covering operation with the protective cover can be easily performed.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an exploded perspective view of the same.

FIGS. 4 (a) and 4 (b) are explanatory views showing steps of locking an outer end of a protective cover to a cover fixing plate.

FIG. 5 is a plan view showing a state in which an outer end of a protective cover is locked to a cover fixing plate.

FIG. 6 is a side view showing a state in which a protective cover is opened by retracting a cover opening plate.

FIG. 7 is a perspective view showing a protective cover.

FIG. 8 is a perspective view showing a conventional cover inserter.

FIG. 9 is a sectional view showing a state where a protective cover is mounted on the cover inserter.

FIG. 10 is an explanatory view showing a conventional covering operation state by a protective cover.

[Explanation of symbols]

 10: Cover fixing plate 11: Lock hole 15, 30: Connecting rod 16: Cover release plate 21: Center pin 33: Operation lever 38: Base block 48: Insulation tube 51: Grip 52: Penetrating rod 54: Operation rod 56: Head block 63: Cap 65: Lock plate

──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Kazuo Hara 2-9-19-1 Minatomachi, Aomori City, Aomori Prefecture Inside Tohoku Electric Power Co., Inc.Aomori City Store (72) Inventor Kazuhiko Hakamada 2-12-19 Minatomachi, Aomori Prefecture No. Tohoku Electric Power Co., Inc.Aomori City Store (72) Inventor Sakamoto Meitsu 2 Nishikicho, Kuroishi City, Aomori Prefecture Tohoku Electric Power Company Kuroishi Sales Office (72) Inventor Shinichi Yanase Ajimorizawa-machi, Niitsugaru-gun, Aomori Prefecture 3-20 Tomita Tohoku Electric Power Co., Inc. Ajigasawa Service Center (72) Inventor Yoshio Saito 1-4, Yamada, Funaoka, Shibata-cho, Shibata-gun, Miyagi Prefecture No. 4 Kita-Nippon Electric Wire Co., Ltd. (72) Inventor Chiba Mikiro No. 1-4, Yamada, Funaoka, Shibata-cho, Shibata-gun, Miyagi Prefecture, Japan. (56) References JP-A-3-139115 (JP, A) JP-A-6-153353 (J JP-A-5-328554 (JP, A) JP-A-3-34612 (JP, U) JP-A-58-57220 (JP, U) JP-A-61-180527 (JP, U) 1-180118 (JP, U) Hikaru 2-102618 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 1/02 H02G 1/16

Claims (2)

(57) [Claims] 1. A method of attaching a protective cover for a conductor exposed portion of an insulated wire, comprising covering a conductor exposed portion from which an insulator of an insulated wire is peeled off with a protective cover which is larger than the conductor exposed portion and wound in a cylindrical shape. Fixing the outer end of the protective cover, opening the protective cover by inserting a center pin into the center hole of the protective cover and moving it away from the fixed side, and opening the protective cover with the conductor After facing the exposed portion, the center pin is further moved in the separating direction to release the engagement of the protective cover by the center pin, thereby being wound by the restoring force of the protective cover to cover the conductor exposed portion. A method of mounting a protective cover for a conductor exposed portion of an insulated wire. 2. A locking hole, which is fixed to the tip of the insulating tube and is larger than the exposed portion of the conductor from which the insulator of the insulated wire has been peeled, and has a locking hole into which the outer end of a protective cover wound in a cylindrical shape is inserted. A cover fixing plate, a cover opening plate having a detachable center pin inserted into a center hole of the protective cover, and being held on the cover fixing plate so as to be able to move forward and backward; A lock plate for fixing the outer end of the protective cover between the operating lever movably attached and connected to the cover opening plate via a connecting rod and the cover fixing plate at a distal end; A tool for mounting a protective cover for a conductor exposed portion of an insulated wire, comprising: a lock mechanism provided with an operation portion for moving a lock plate forward and backward at a base of the insulating tube.