Switch replacement tool

Abstract

To provide a switch replacement jig which has a small number of parts, is easily detachable, and can be attached to switches of various manufacturers. [Solution] The switch replacement jig 1 is fixed to an arm on a pole and is used when replacing a switch 10 having a first engaged portion 11 and a second engaged portion 12 spaced apart in the left-right direction from the first engaged portion 11. The switch replacement jig 1 has a main body 2, a first slide bar 3 that is slidable in the left-right direction and has a first engaging portion 31 engageable with the first engaged portion 11, and a second slide bar 4 that is slidable in the left-right direction and has a second engaging portion 41 engageable with the second engaged portion 12. A storage space 3a is defined in the first slide bar 3 for hanging on the arm.

Description

[Technical field]

[0001] The present invention relates to a switch replacement jig, and more particularly to a switch replacement jig used when replacing a pole-mounted switch. [Background technology]

[0002] When replacing a pole-mounted switchgear by the conventional method, the old switchgear 10 is removed from the cross arm 13, and then, as shown in FIG. 6, a wire W is passed through each of the first engaged portion 11 and the second engaged portion 12 provided on the switchgear 10, and the switchgear 10 is hoisted up onto the pole by a crane (not shown). Next, the switchgear 10 is temporarily fixed to the cross arm 13 by the first fixing bracket 14 provided on the second engaged portion 12. At this time, in order to avoid interference with electric wires (not shown), it is necessary to temporarily remove the wire W from the first engaged portion 11 and hook it on the first engaged portion 11 again. Specifically, the switchgear 10 is placed directly below the cross arm 13, and the first fixing bracket 14 is temporarily fixed to the cross arm 13. Since both the left and right wires W are located in front of the cross arm 13, the wire W hung on the first engaged portion 11 is removed, and the wire W is passed through the first engaged portion 11 behind the cross arm 13, straddling the cross arm 13. Thereafter, the second engaged portion 12 is fixed to the cross arm 13, thereby completing the attachment of the switch 10 to the cross arm 13.

[0003] Also, a switchgear hoisting tool used when replacing a switchgear in a live line state is known (Patent Document 1). The switchgear hoisting tool suspends the switchgear with a fixing bolt and hoists the switchgear by hooking a winch hook onto the hoisting ring. Once the switchgear has been attached to the cross arm, the fixing bolt is loosened and the switchgear is moved along the groove to remove the switchgear hoisting tool.

[0004] In another cross arm mounting device, the switch is brought close to the cross arm by a sling, and the upper part of the hanger is wrapped around the cross arm and fixed with a bolt (Patent Document 2). With this configuration, it is possible to provide a cross arm mounting device that can stably mount and fix the power distribution device to the cross arm. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2000-152440 A [Patent Document 2] JP 2015-220868 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, as shown in Fig. 6, when attaching the switch 10 to the arm 13 by passing the wire W through the first fixing bracket 14 and the second fixing bracket 15, it was necessary to temporarily remove the wire W from the first engaged part 11, which made the switch 10 unstable and there was a risk of it falling. Furthermore, since it was necessary to remove and attach the wire W to the first engaged part 11, the replacement work of the switch 10 took time.

[0007] The switchgear hoisting tool described in Patent Document 1 is used when replacing a switchgear in a live line state, but in recent years, switchgear replacement in a live line has not been performed, and it is common to perform work in a state where the work section is made a dead line by bypass construction. In addition, although there are various shapes of switchgear depending on the manufacturer, the switchgear described in Patent Document 1 had a problem that it could not be used unless the top surface was flat. Furthermore, since the switchgear hoisting tool has a large number of parts, it takes time to attach it to the switchgear, and there is a risk of the parts falling off.

[0008] The cross arm mounting device described in Patent Document 2 has a structure for the part attached to the switch that is limited to a specific manufacturer, and cannot be used with switches from other manufacturers. Also, because it has a large number of parts, it takes time to set up and there is a risk of parts falling off, just like Patent Document 1.

[0009] Therefore, an object of the present invention is to provide a switch replacement jig that requires a small number of parts, can be easily attached and detached, and can be attached to switches of various manufacturers. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides a switch replacement jig used when replacing a switch that is fixed to an arm on a pole and has a first engaged portion and a second engaged portion spaced apart in a predetermined direction from the first engaged portion, the switch replacement jig comprising: a main body having a lifting portion that is lifted by an external device; a first slide bar that is slidable in a predetermined direction from the main body and has a first engaging portion engageable with the first engaged portion; a second slide bar that is slidable in the predetermined direction from the main body and has a second engaging portion engageable with the second engaged portion; and a fixing portion that is provided on the main body and fixes the positions of the first slide bar and the second slide bar, and the first slide bar is provided with a hook portion that is hooked onto the arm.

[0011] It is also preferable that the first slide bar has a protrusion that engages with the second slide bar, and the second slide bar has a receiving portion capable of receiving the protrusion.

[0012] It is also desirable that the main body portion is capable of storing the first slide bar and the second slide bar, the first slide bar and the second slide bar are switchable between a storage state in which they are stored in the main body portion and a usage state in which they are exposed from the main body portion, and the fixing portion is capable of fixing the first slide bar and the second slide bar at any position.

[0013] It is also desirable that the fixing portion is a bolt, that a long hole through which the bolt can be inserted is formed in the main body portion, that the first slide bar and the second slide bar are formed with a screw hole into which the bolt is engaged, and that the first slide bar and the second slide bar are fixed to the main body portion by the bolt engaging with the screw hole via the long hole. Effect of the Invention

[0014] According to this configuration, since the first slide bar and the second slide bar are slidable in a predetermined direction, the switch replacement jig can be attached to the switch regardless of the distance between the first engaged part and the second engaged part that are separated in the predetermined direction. This makes it possible to realize a switch replacement jig that can be attached to switches of various manufacturers. Furthermore, since the first slide bar is provided with a hook part that is hooked onto the arm, it can be maintained in a state where it is hooked onto the arm. This makes it possible to shorten the work time and replace the switch in a safer work environment compared to when the replacement work is performed in a state where the switch is suspended by a wire or the like. Furthermore, the first slide bar and the second slide bar are engaged with the convex part and the receiving part, so that they can move only in a predetermined direction. This makes it possible to realize a switch replacement jig that can be attached to switches of various manufacturers with a small number of parts and a simple structure and has a high level of safety. Furthermore, since the first slide bar and the second slide bar can be fixed at any position by the fixing part, it is possible to realize a switch replacement jig that can be attached to switches of various manufacturers and has a high level of safety. Furthermore, since the first slide bar and the second slide bar can be stored in the main body, the switch replacement jig can be made compact.

[0015] According to the present invention, it is possible to provide a switch replacement jig that has a small number of parts, is easily detachable, and can be attached to switches of various manufacturers. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a perspective view of a switch replacement jig according to an embodiment of the present invention; [Diagram 2] 4 is a perspective view showing a fitted state of a first slide bar and a second slide bar of the switch replacement jig according to the embodiment of the present invention; FIG. [Diagram 3] FIG. 2 is an exploded perspective view of a switch replacement jig according to an embodiment of the present invention; [Figure 4] 1 is a perspective view of a switch replacement jig according to an embodiment of the present invention when attached to a switch; [Diagram 5]1 is a perspective view of a switch replacement jig according to an embodiment of the present invention when attached to a switch and hooked onto an arm; [Figure 6] FIG. 13 is a perspective view of a conventional switch hung by a wire when being replaced. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] A switch replacement jig 1 according to an embodiment of the present invention will be described with reference to Fig. 1 to Fig. 5. As shown in the drawings, front, back, top, bottom, left and right directions are defined.

[0018] The switchgear replacement jig 1 is made of metal, and as shown in Figures 1 and 3, is composed of a main body 2, a first slide bar 3, a second slide bar 4, and a fixing part 5. The main body 2 is generally U-shaped when viewed from the left and right, and defines therein a storage space 2a capable of storing the first slide bar 3 and the second slide bar 4. A lifting part 21 is provided in the approximate center of the upper surface of the main body 2 for lifting the switchgear replacement jig 1 by a winch, a crane, or the like.

[0019] The hoisting part 21 has a through hole 22 for hanging the wire W or a hook. The top surface of the main body 2 has a long hole 23 that penetrates in the vertical direction. The long hole 23 is located a predetermined distance away from the hoisting part 21 in the front-rear direction and is positioned laterally away from the center of the main body 2. The front surface of the main body 2 has folded parts 24 that protrude in the vertical direction, and an opening 25 is formed between the folded parts 24.

[0020] The first slide bar 3 can be stored in the storage space 2a, and is restrained by the second slide bar 4 and the fixed portion 5, so that it can slide only in the left-right direction. As shown in Figs. 2 and 3, the first slide bar 3 has a first engagement portion 31, a convex portion 32, a contact portion 33, and a first folded-back portion 34. A holding space 3a is defined inside the first slide bar 3, in which the arm 13 is hung and held. The height and front-rear depth of the holding space 3a can be set as desired based on the shape of the arm 13.

[0021] The first engaging portion 31 is engageable with the first engaged portion 11 of the switch 10 as shown in Fig. 4, is located at the right end of the first slide bar 3, and has an upward protruding tip. The amount of upward protrusion of the first engaging portion 31 is set to be lower than the height of the first engaged portion 11 of a typical switch 10. A first screw hole 3b with which the fixing portion 5 engages is formed at the left end of the upper surface of the first slide bar 3. The retaining space 3a is an example of a hook portion of the present invention, and the left-right direction is an example of a predetermined direction of the present invention.

[0022] The protrusion 32 protrudes rearward in a generally U-shaped manner as viewed from the left-right direction, and is engageable with the second slide bar 4. The abutment portion 33 is abuttable with the second slide bar 4, and abuts against the arm 13 when the arm 13 is positioned in the retaining space 3a. The first folded-back portion 34 protrudes in the vertical direction from the front end of the first slide bar 3, and when the first slide bar 3 is stored in the main body 2 as shown in FIG. 1, it comes into sliding contact with the inner surface of the folded-back portion 24, thereby guiding the left-right movement of the first slide bar 3. The first slide bar 3 is slidable only in the left-right direction due to the abutment between the first folded-back portion 34 and the folded-back portion 24 and the abutment between the abutment portion 33 and the second slide bar 4.

[0023] The second slide bar 4 can be stored in the storage space 2a, and is restrained by the convex portion 32 and the fixing portion 5, so that it can slide only in the left-right direction. As shown in Figs. 2 and 3, the second slide bar 4 has a second engagement portion 41 and a second folded portion 42, and defines a storage space 4a in which the convex portion 32 can be stored. The second engagement portion 41 can be engaged with the second fixing metal fitting 15 of the switch 10 as shown in Fig. 4, and is located at the left end of the second slide bar 4, with its tip protruding upward. The amount of upward protrusion of the second engagement portion 41 is substantially the same as the amount of protrusion of the first engagement portion 31, and is set lower than the height of the second fixing metal fitting 15 of a general switch 10.

[0024] The second folded portion 42 protrudes in the up-down direction from the front end of the second slide bar 4, and when the first slide bar 3 and the second slide bar 4 are engaged as shown in Figs. 1 and 2, it slides against the step of the protruding portion 32 to guide the left-right movement of the second slide bar 4. A second screw hole 4b is formed in the right end of the upper surface of the second slide bar 4, with which the fixing portion 5 engages. The storage space 4a is an example of a receiving portion of the present invention. The second slide bar 4 can slide only left-right due to the abutment between the second folded portion 42 and the first slide bar 3 and the abutment between the rear surface of the second slide bar 4 and the main body portion 2.

[0025] The fixing portion 5 is a pair of bolts, which, as shown in Figures 1 and 3, fix the positions of the first slide bar 3 and the second slide bar 4 by engaging with the first screw hole 3b and the second screw hole 4b via the long hole 23. The fixing portion 5 allows the first slide bar 3 and the second slide bar 4 to be fixed at any position on the main body portion 2. The first screw hole 3b and the second screw hole 4b are an example of the screw holes of the present invention.

[0026] Next, a method of using the switchgear replacement jig 1 will be described with reference to Figures 4 and 5. When replacing the switchgear replacement jig 1, the work is carried out in a state where the work section is made a dead line by bypass work.

[0027] The switchgear replacement jig 1 is placed on the top surface of the switchgear 10, and the fixing portion 5 is loosened to allow the first slide bar 3 and the second slide bar 4 to slide left and right. The first engaging portion 31 is engaged with the first engaged portion 11 and the second engaging portion 41 is engaged with the second engaged portion 12, and the fixing portion 5 is tightened to fix the positions of the first slide bar 3 and the second slide bar 4 relative to the main body portion 2. This completes the attachment of the switchgear replacement jig 1 to the switchgear 10, as shown in FIG. 4.

[0028] When replacing the switch 10, first, the old switch 10 attached to the cross arm 13 is removed. Next, the switch replacement jig 1 is lifted up by a crane through the wire W passed through the through hole 22 of the lifting part 21, and the cross arm 13 is placed in the holding space 3a through the opening 25 as shown in FIG. 5, so that the switch replacement jig 1 is hooked onto the cross arm 13. In this state, the first fixing bracket 14 and the second fixing bracket 15 are fixed to the cross arm 13, so that the switch 10 is fixed to the cross arm 13. The fixing part 5 is loosened, and the first slide bar 3 is moved leftward to release the engagement between the first engaging part 31 and the first engaged part 11, and the second slide bar 4 is moved rightward to release the engagement between the second engaging part 41 and the second engaged part 12. The switch replacement jig 1 is moved backward, and the switch replacement jig 1 is removed from the switch 10. Thereafter, the first fixing metal fitting 14 and the second fixing metal fitting 15 are retightened, and wiring work for the switch 10 is performed, and replacement of the switch 10 is completed.

[0029] According to this configuration, since the first slide bar 3 and the second slide bar 4 can slide in the left-right direction, the switch replacement jig 1 can be attached to the switch 10 regardless of the distance between the first engaged part and the second engaged part separated in the left-right direction. This makes it possible to realize a switch replacement jig 1 that can be attached to the switch 10 of various manufacturers. In addition, since the first slide bar 3 has a holding space 3a for hanging on the arm 13, it can be held in a state where it is hung on the arm 13. This makes it possible to shorten the work time and replace the switch 10 in a safe work environment compared to a case where the replacement work is performed in a state where the switch 10 is hung by a wire or the like as shown in FIG. 6. In addition, the first slide bar 3 and the second slide bar 4 are engaged with the convex part 32 and the storage space 4a, so that they can move only in the left-right direction. This makes it possible to realize a switch replacement jig 1 that can be attached to the switch 10 of various manufacturers with a small number of parts and a simple structure and is highly safe. Furthermore, since the first slide bar 3 and the second slide bar 4 can be fixed at any position by the fixing portion 5, it is possible to realize a highly safe switchgear replacement jig 1 that can be attached to switches 10 of various manufacturers. Also, since the first slide bar 3 and the second slide bar 4 can be stored in the main body portion 2, the switchgear replacement jig 1 can be made compact.

[0030] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention described in the claims of the utility model registration.

[0031] In the above embodiment, the cross arm 13 is held by being hooked in the holding space 3a, but this is not limited thereto. For example, a locking member extending in the vertical direction so as to connect the upper and lower folded-back portions 24 to the opening 25 can be provided. The locking member is switchable between a closed state in which at least a part of the opening 25 is closed, and an open state in which the opening 25 is open. When attaching the switch 10 to which the switch replacement jig 1 is attached to the cross arm 13, the locking member is opened to open the opening 25, and after the switch 10 is attached to the cross arm 13, the locking member is closed. This makes it possible to prevent the switch replacement jig 1 from coming off the cross arm 13. [Explanation of symbols]

[0032] 1 Switch replacement tool 2 Main unit 3 First Slide Bar 3a Holding space 3b 1st screw hole 4 Second Slide Bar 4a Storage space 4b Second screw hole 5 Fixed part 10 Switchgear 11 First engaged part 12 Second engaged part 13 Arms 21 Lifting part 23 long hole 31 First engagement portion 32 Convex 41 Second engagement portion

Claims

1. A switch replacement jig used when replacing a switch that is fixed to a bracket on a pole and has a first engaged portion and a second engaged portion spaced apart in a predetermined direction from the first engaged portion, A main body having a lifting portion that is lifted by an external device; a first slide bar that is slidable in the predetermined direction from the main body and has a first engaging portion that is engageable with the first engaged portion; a second slide bar that is slidable in the predetermined direction from the main body and has a second engaging portion that is engageable with the second engaged portion; a fixing portion provided on the main body portion and configured to fix positions of the first slide bar and the second slide bar; The switch replacement jig according to claim 1, wherein the first slide bar is provided with a hook portion for hooking onto the arm.

2. the first slide bar has a protrusion that engages with the second slide bar, 2. The switch replacement jig according to claim 1, wherein the second slide bar has a receiving portion capable of receiving the protrusion.

3. The main body portion is capable of housing the first slide bar and the second slide bar, The first slide bar and the second slide bar are switchable between a storage state in which they are stored in the main body and a use state in which they are exposed from the main body, 2. The switch replacement jig according to claim 1, wherein the fixing portion is capable of fixing the first slide bar and the second slide bar at any desired positions.

4. The fixing portion is a bolt, The main body portion is formed with a long hole through which the bolt can be inserted, The first slide bar and the second slide bar are formed with screw holes into which the bolts are engaged, 2. The switch replacement jig according to claim 1, wherein the first slide bar and the second slide bar are fixed to the body portion by the bolts engaging with the screw holes through the elongated holes.

Images