Auxiliary tool

Abstract

To smoothly draw out and push in a breaker by only one worker.SOLUTION: A handle portion protruding from the front panel and configured to be operated when a position of the handle portion is changed from a first position at which the movement of the circuit breaker is prohibited to a second position at which the movement of the circuit breaker is permitted, and an interlock lever portion that returns from the second position to the first position when an external force for holding the interlock lever portion at the second position is removed, wherein the assist tool has an elongated shape, has a first engaging portion that engages with the interlock lever portion at one end, and has a second engaging portion that engages with the handle portion at the other end so that the interlock lever portion engaged with the first engaging portion is held at the second position.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an auxiliary tool that assists in the operation of an interlock lever when moving a circuit breaker in the pull-out direction or the push-in direction. [Background technology]

[0002] A technique is known in which an interlock lever is operated to move a circuit breaker in a pull-out direction and a push-in direction (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 3-93409 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above technique, the circuit breaker must be pulled out and pushed in while the interlock lever is held in a position that allows the circuit breaker to be moved, which makes it difficult for a single worker to smoothly pull out and push in the circuit breaker, and there is a risk that it will take a long time to complete the operations.

[0005] The present invention has been made in consideration of the above-mentioned problems, and one object of the present invention is to provide an auxiliary tool for assisting in the operation of an interlock lever so that a single worker can smoothly pull out and push in a circuit breaker. [Means for solving the problem]

[0006] To achieve the above object, one of the present inventions includes a front panel that moves the circuit breaker housed in a housing in a push-in direction, which is a direction in which the circuit breaker approaches the live section, when connecting the contacts of the circuit breaker housed in the housing to the live section, and moves the circuit breaker in a pull-out direction, which is a direction in which the circuit breaker moves away from the live section, when disconnecting the contacts of the circuit breaker from the live section; a handle that protrudes from the front panel and is gripped when moving the circuit breaker in the push-in direction and the pull-out direction; and a handle that protrudes from the front panel and prohibits movement of the circuit breaker in the push-in direction and the pull-out direction. and an interlock lever section that is operated to change its position from a first position when the circuit breaker is pressed in to a second position when movement of the circuit breaker in the push-in direction and the pull-out direction is permitted, and that returns to the first position when the external force holding it in the second position is removed. In this switchgear, an auxiliary tool for assisting the operation of the interlock lever section has an elongated shape and has at one end a first engaging section that engages with the interlock lever section, and at the other end a second engaging section that engages with the handle section so that the interlock lever section engaged with the first engaging section is held in the second position.

[0007] According to the present invention, it is possible for a single worker to smoothly move the circuit breaker in the pull-out direction and the push-in direction.

[0008] In another aspect of the present invention to achieve the above object, in the assisting tool, the second position is a position higher than the first position.

[0009] According to the present invention, when the interlock lever portion is structured to return from the second position to the first position by its own weight, it can be reliably returned to the first position.

[0010] Another aspect of the present invention for achieving the above object is that, in an auxiliary device, when the second engagement portion is disengaged from the handle portion, the interlock lever portion returns from the second position to the first position.

[0011] According to the present invention, the interlock lever portion returns to the first position when the engagement between the handle portion and the second engagement portion is released, making it possible to move the circuit breaker in the pull-out and push-in directions with high accuracy.

[0012] Another aspect of the present invention for achieving the above object is an auxiliary device in which the first engagement portion is a hole portion into which the tip of the interlock lever portion is inserted, the handle portion includes a gripping portion and a connecting portion that connects the gripping portion and the front panel, and the second engagement portion is a notch portion that contacts and hooks onto the outer surface of the connecting portion.

[0013] According to the present invention, the interlock lever portion can be returned to the first position by simply performing the simple operation of releasing the notch portion from the outer circumferential surface of the connecting portion.

[0014] Another aspect of the present invention for achieving the above-mentioned object is that, in an auxiliary device, when the contact of the notch portion with the outer peripheral surface of the connecting portion is released, the other end portion is placed on top of the outer peripheral surface of the connecting portion.

[0015] According to the present invention, the interlock lever portion can be held again in the second position by the simple operation of hooking the notched portion again onto the outer circumferential surface of the connecting portion.

[0016] In addition, the problems and solutions disclosed in this application will be made clear by the description in the section on the preferred embodiment of the invention and the drawings. [Effects of the Invention]

[0017] According to the present invention, it is possible for a single worker to smoothly move the circuit breaker in the pull-out direction and the push-in direction. [Brief explanation of the drawings]

[0018] [Figure 1]1 is a front view showing an example of a switchgear 1 in which a circuit breaker 101 is housed. [Figure 2] 2 is a side view of FIG. 1 showing an example of a switchgear 1 in which a circuit breaker 101 is housed. [Figure 3] FIG. 2 is a plan view showing an example of an assisting tool 200. [Figure 4A] 10A and 10B are diagrams showing an example of how an auxiliary tool 200 is attached when movement of a circuit breaker 101 is prohibited. [Figure 4B] 10A and 10B are diagrams showing an example of how the auxiliary tool 200 is attached when the movement of the circuit breaker 101 is permitted. [Figure 5] FIG. 10 is a plan view showing an example of another assisting tool 300. [Figure 6A] 10A and 10B are diagrams showing an example of how an auxiliary tool 300 is attached when movement of a circuit breaker 101 is prohibited. [Figure 6B] 10A and 10B are diagrams showing an example of how the auxiliary tool 300 is attached when the movement of the circuit breaker 101 is permitted. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings, in which:

[0020] <<Switchgear 1>> FIG. 1 is a front view of a main portion of an example of a switchgear (enclosed switchboard) 1 accommodating a circuit breaker 101. FIG. 2 is a side view of the example of the switchgear (enclosed switchboard) 1 accommodating a circuit breaker 101, as shown in FIG. 1 . To facilitate understanding of the following description, FIGS. 1 and 2 depict an X-axis, a Y-axis, and a Z-axis. The X-axis is an axis perpendicular to a YZ plane formed by orthogonal Y-axis and Z-axis. The Y-axis is an axis perpendicular to an XZ plane formed by orthogonal X-axis and Z-axis. The Z-axis is an axis perpendicular to an XY plane formed by orthogonal X-axis and Y-axis. For ease of explanation, FIG. 2 shows the side panel on the front side (+X side) of the housing 103 in perspective. Furthermore, in FIGS. 1 and 2, components not directly related to the present invention are omitted.

[0021] Circuit breaker 101 is a switch connected between a primary-side (power supply side) electric circuit and a secondary-side (load side) electric circuit, and when an overcurrent flows in the secondary-side electric circuit, opens the electric circuit between the primary and secondary sides to cut off the supply of current from the primary side to the secondary side, thereby protecting electric wires and loads connected to the secondary side from damage, and is housed inside housing 103 of switchgear 1. On the back surface (+Y side) of circuit breaker 101, contactor 102a to be connected to the primary-side electric circuit and contactor 102b to be connected to the secondary-side electric circuit are provided.

[0022] Charging section 104a connected to the primary-side electrical circuit and charging section 104b connected to the secondary-side electrical circuit are provided to penetrate back panel 103a (surface parallel to the XZ plane in the +Y direction) of housing 103. Contact surfaces of charging sections 104a and 104b are provided to face and connect to contacts 102a and 102b of circuit breaker 101, respectively.

[0023] In order to inspect the circuit breaker 101, the housing 103 is provided with a cart 105 for moving the circuit breaker 101 in both a pull-out direction (-Y direction) in which the circuit breaker 101 moves away from the charging units 104a and 104b, and a push-in direction (+Y direction) in which the circuit breaker 101 moves toward the charging units 104a and 104b. The cart 105 is provided with a mounting plate 105a on which the circuit breaker 101 is placed, and four wheels 105b for moving the mounting plate 105a in the pull-out direction and the push-in direction. The four wheels 105b are provided at one corner of the placing plate 105a on the back plate 103a side (the corner in the -X direction and the +Y direction), the other corner of the placing plate 105a on the back plate 103a side (the corner in the +X direction and the +Y direction), one corner of the placing plate 105a on the opposite side to the back plate 103a (the corner in the -X direction and the -Y direction), and the other corner of the placing plate 105a on the opposite side to the back plate 103a (the corner in the +X direction and the -Y direction). The two wheels 105b on the +X side are placed on one guide plate 103b extending along the pull-out direction and the push-in direction inside the housing 103, and the two wheels 105b on the -X side are placed on the other guide plate 103b extending parallel to the guide plate 103b along the pull-out direction and the push-in direction inside the housing 103.

[0024] A front panel 106 that stands up vertically facing the operator is provided on housing 103. Front panel 106 is connected to the end of mounting plate 105a on the opposite side (-Y side) from back plate 103a, and is integrated with cart 105. A pair of handles 107a, 107b, an interlock lever 108, a confirmation window 109, etc. are provided on the surface of front panel 106 on the side facing the operator (-Y side).

[0025] The handles 107a and 107b are provided on the front panel 106 on the side facing the worker, protruding toward the worker, and are gripped by the worker with both hands. The handles 107a and 107b are provided on both the left and right sides (-X and +X sides) of the upper (+Z side) area of ​​the front panel 106. When moving the circuit breaker 101 in the pull-out direction, the worker applies a pulling force to the front panel 106 toward the worker while gripping the handles 107a and 107b. On the other hand, when moving the circuit breaker 101 in the push-in direction, the worker applies a pushing force to the front panel 106 toward the rear panel 103a while gripping the handles 107a and 107b. In this embodiment, the shape of the handles 107a and 107b is, for example, a U-shape when viewed from the side from the +X direction (or -X direction) toward the -X direction (or +X direction). Specifically, handle portions 107a and 107b include a cylindrical connecting portion 1071 extending horizontally (along the Y-axis) from front panel 106, a connecting portion 1072 having the same shape as connecting portion 1071 and extending horizontally (along the Y-axis) from a position a predetermined distance below (in the -Z direction) in the vertical direction (along the Z-axis) from connecting portion 1071, and a cylindrical grip portion 1073 extending vertically and joined to ends of connecting portions 1071 and 1072 on the side opposite front panel 106. Handle portions 107a and 107b can be formed using, for example, a zinc alloy, stainless steel, an aluminum alloy, or the like.

[0026] An interlock mechanism (not shown) is disposed inside the housing 103 together with the circuit breaker 101. The interlock mechanism prohibits the circuit breaker 101 from moving in the pull-out and push-in directions, and allows the circuit breaker 101 to move in the pull-out and push-in directions. The interlock lever 108 is connected to the interlock mechanism. The tip 108a of the interlock lever 108 protrudes toward the operator from the surface of the front panel 106 facing the operator. The tip 108a has, for example, a cylindrical shape, so that the operator can grasp and operate it. The tip 108a is movable along the shape of the guide groove 108b between a first position A, which prohibits the circuit breaker 101 from moving, and a second position B, which allows the circuit breaker 101 to move. The second position B is located above the first position A (on the +Z side). When no operating force (external force) is applied by the operator, the tip 108a of the interlock lever portion 108 is held at the first position A by its own weight. Furthermore, when the operator stops applying an operating force to lift the tip 108a to the second position B, the tip 108a of the interlock lever portion 108 returns from the second position B to the first position A by its own weight. In order to prevent the circuit breaker 101 from remaining in a state in which movement is permitted, the guide groove 108b has, for example, an inclined side C that descends vertically from one side to the other side (from the +X side to the -X side) in the horizontal direction so that the tip 108a of the interlock lever portion 108 can move from the second position B to the first position A by its own weight. The above-mentioned interlock mechanism operates to prohibit movement of the circuit breaker 101 when the tip 108a of the interlock lever portion 108 is in the first position A, and operates to allow movement of the circuit breaker 101 when the tip 108a of the interlock lever portion 108 is in the second position B.

[0027] When the circuit breaker 101 opens the electrical circuit between the primary side electrical circuit and the secondary side electrical circuit, the confirmation window 109 displays "OFF" in conjunction with the opening operation of the circuit breaker 101, and when the circuit breaker 101 is closed to connect the electrical circuit between the primary side electrical circuit and the secondary side electrical circuit, the confirmation window 109 displays "ON" in conjunction with the closing operation of the circuit breaker 101.

[0028] <<Auxiliary tool 200>> Fig. 3 is a plan view showing an example of the auxiliary tool 200. Fig. 4A is a diagram showing an example of how the auxiliary tool 200 is attached when the movement of the circuit breaker 101 is prohibited. Fig. 4B is a diagram showing an example of how the auxiliary tool 200 is attached when the movement of the circuit breaker 101 is permitted.

[0029] The auxiliary tool 200 is a member that assists in holding the tip 108a of the interlock lever portion 108 at the second position B, which permits movement of the circuit breaker 101, only when the circuit breaker 101 is moved in the pull-out direction or the push-in direction for the purpose of inspecting the circuit breaker 101. The auxiliary tool 200 is a member that can continuously hold the tip 108a of the interlock lever portion 108 at the second position B once an operator performs a setting operation. The auxiliary tool 200 is, for example, a long, rectangular plate member and is formed using, for example, a zinc alloy, stainless steel, or aluminum alloy. In this embodiment, the auxiliary tool 200 has a shape that can continuously hold the tip 108a at the second position B by engaging at both ends with the connecting portion 1071 of the handle portion 107a and the tip 108a of the interlock lever portion 108.

[0030] One end of the auxiliary tool 200 is provided with a hole 210, the diameter of which is slightly larger than the diameter of the tip 108a of the interlock lever part 108, into which the tip 108a fits. In this embodiment, the cross section of the tip 108a is circular, so the hole 210 is similarly circular. Then, by aligning the plate surface of the auxiliary tool 200 parallel to the surface of the front panel 106 and bringing the auxiliary tool 200 closer to the front panel 106, the tip 108a fits into the hole 210. In other words, the auxiliary tool 200 is able to freely rotate clockwise or counterclockwise around the longitudinal axis of the interlock lever part 108.

[0031] Furthermore, at the other end of the assisting tool 200, a notch 220 having a shape that comes into surface contact with the outer circumferential surface of the connecting part 1071 is provided at a corner on the side facing the connecting part 1071. The notch 220 has, for example, an arc shape with a central angle of 90 degrees. The arc-shaped portion of the notch 220 is a portion that comes into surface contact with ¼ (90 degrees) of the outer circumferential surface of the connecting part 1071. Specifically, when one end of the assisting tool 200 is positioned at the first position A, the notch 220 does not come into surface contact with the outer circumferential surface of the connecting part 1071, and at the other end of the assisting tool 200, the tip of the edge 230 that is closer to the hole 210 than the notch 220 rides up onto the outer circumferential surface of the connecting part 1071 and remains on the outer circumferential surface of the connecting part 1071. On the other hand, when one end of the auxiliary device 200 is at the second position B, the cutout portion 220 comes into surface contact with the outer surface of the connecting portion 1071 and becomes caught, preventing the auxiliary device 200 from moving, and the tip 108a is held at the second position B without returning to the first position A.

[0032] In this embodiment, the number of holes 210 provided in the auxiliary tool 200 is one, but is not limited to this. To enable the auxiliary tool 200 to be shared with different types of switchgear, a hole 240 shown by a dashed line may be provided at a position where the tip of the interlock lever part of a different type of switchgear fits.

[0033] <<Pulling-out and pushing-in operations of the circuit breaker 101 when the auxiliary tool 200 is used>> The following describes an example of an operation performed by an operator when inspecting the circuit breaker 101. It is assumed that the position of the tip 108a of the interlock lever portion 108 is the first position A, which prohibits the circuit breaker 101 from moving.

[0034] First, to ensure that inspection work on the circuit breaker 101 can be carried out safely, it is confirmed whether the circuit breaker 101 is in an open state and the display on the confirmation window 109 is "off."

[0035] Next, when it is confirmed that the display in the confirmation window 109 is "OFF," the tip 108a of the interlock lever portion 108 is fitted into the hole portion 210 provided at one end of the auxiliary tool 200. At this time, the tip of the edge 230 at the other end of the auxiliary tool 200, which is closer to the hole portion 210 than the notch portion 220, is placed on the outer peripheral surface of the connecting portion 1071.

[0036] Next, while pinching the tip 108a of the interlock lever portion 108, the tip 108a is lifted and moved along the guide groove 108b from the first position A to the second position B. In the process of lifting the tip 108a to the second position B, the tip 108a moves upward along the inclined side C of the guide groove 108b in a direction away from the connecting portion 1071, and the auxiliary tool 200 rotates counterclockwise around the longitudinal axis of the tip 108a, and the notch portion 220 comes into surface contact with the outer peripheral surface of the connecting portion 1071 and becomes caught on the connecting portion 1071. As a result, the tip 108a is held in the second position B, and the circuit breaker 101 can be pulled out.

[0037] Next, while gripping the handles 107a and 107b, a force is applied in the pull-out direction. As a result, the cart 105 moves in the pull-out direction, and the circuit breaker 101 also moves in the pull-out direction. Then, when the circuit breaker 101 has been pulled out from the connection position where the contacts 102a and 102b of the circuit breaker 101 are connected to the live parts 104a and 104b, respectively, to the disconnection position where the contacts 102a and 102b of the circuit breaker 101 are disconnected from the live parts 104a and 104b, the pulling-out of the circuit breaker 101 is stopped.

[0038] Next, edge 230 is pushed slightly upward at the other end of auxiliary tool 200. As a result, notch 220 moves away from the outer peripheral surface of connecting part 1071, tip 108a returns from second position B to first position A due to its own weight, and the tip of edge 230, which is closer to hole 210 than notch 220 at the other end of auxiliary tool 200, once again rides up on the outer peripheral surface of connecting part 1071. This prevents circuit breaker 101 from moving, making it possible to inspect circuit breaker 101.

[0039] Next, when inspection of circuit breaker 101 is completed, tip 108a of interlock lever portion 108 is grasped and moved while lifting it up along guide groove 108b from first position A to second position B. At this time, auxiliary tool 200 rotates counterclockwise around the longitudinal axis of tip 108a, and notch portion 220 comes into surface contact with the outer circumferential surface of connecting portion 1071 and becomes hooked on connecting portion 1071. As a result, tip 108a is held in second position B, and circuit breaker 101 can be pushed in.

[0040] Next, while gripping the handles 107a and 107b, a force is applied in the pushing direction. As a result, the cart 105 moves in the pushing direction, and the circuit breaker 101 also moves in the pushing direction. Then, when the circuit breaker 101 has been pushed in from the disconnecting position where the contacts 102a and 102b of the circuit breaker 101 are disconnected from the live parts 104a and 104b, to the connecting position where the contacts 102a and 102b of the circuit breaker 101 are connected to the live parts 104a and 104b, respectively, the pushing of the circuit breaker 101 is stopped.

[0041] Next, side 230 is pushed upward at the other end of auxiliary tool 200. As a result, notch 220 moves away from the outer peripheral surface of connecting part 1071, tip 108a returns from second position B to first position A due to its own weight, and the tip of side 230, which is closer to hole 210 than notch 220 at the other end of auxiliary tool 200, once again rides up on the outer peripheral surface of connecting part 1071. This prevents circuit breaker 101 from moving.

[0042] Finally, the circuit breaker 101 is set to the closed state, and the confirmation window 109 displays "ON."

[0043] <<Auxiliary tool 300>> Fig. 5 is a plan view showing an example of another auxiliary tool 300. Fig. 6A is a diagram showing an example of how the auxiliary tool 300 is attached when the movement of the circuit breaker 101 is prohibited. Fig. 6B is a diagram showing an example of how the auxiliary tool 300 is attached when the movement of the circuit breaker 101 is permitted.

[0044] The auxiliary tool 300 is a member that assists in holding the tip 108a of the interlock lever portion 108 at the second position B, which permits movement of the circuit breaker 101, only when the circuit breaker 101 is moved in the pull-out direction or the push-in direction for the purpose of inspecting the circuit breaker 101. The auxiliary tool 300 is a member that can continuously hold the tip 108a of the interlock lever portion 108 at the second position B once an operator performs a setting operation. The auxiliary tool 300 is, for example, a long, rectangular plate member and is formed using, for example, a zinc alloy, stainless steel, or aluminum alloy. In this embodiment, the auxiliary tool 300 has a shape that can continuously hold the tip 108a at the second position B by engaging, at both ends, the connecting portion 1071 of the handle portion 107a with the tip 108a of the interlock lever portion 108.

[0045] One end of the auxiliary tool 300 is provided with a hole 310, the diameter of which is slightly larger than the diameter of the tip 108a of the interlock lever part 108, into which the tip 108a fits. In this embodiment, the cross section of the tip 108a is circular, so the hole 310 is similarly circular. Then, by aligning the plate surface of the auxiliary tool 300 parallel to the surface of the front panel 106 and bringing the auxiliary tool 300 closer to the front panel 106, the tip 108a fits into the hole 310. In other words, the auxiliary tool 300 is able to freely rotate clockwise or counterclockwise around the longitudinal axis of the interlock lever part 108.

[0046] Furthermore, a long notch 320 is provided in a part of the side 330 of the assisting device 300 facing the connecting portion 1071, the notch 320 being cut out along the longitudinal direction of the assisting device 300. The shape of the notch 320, at the end closer to the other end of the assisting device 300, is in surface contact with the outer circumferential surface of the connecting portion 1071, for example, an arc shape with a central angle of 90 degrees. The arc-shaped portion of the notch 320 is a portion that contacts 1 / 4 (90 degrees) of the outer circumferential surface of the connecting portion 1071. Specifically, when one end of the assisting device 300 is positioned at the first position A, the notch 320 does not come into surface contact with the outer circumferential surface of the connecting portion 1071, and at the other end of the assisting device 300, a tip 330a of the side 330 closer to the other end than the notch 320 rides up on the outer circumferential surface of the connecting portion 1071. On the other hand, when one end of the auxiliary device 300 is at the second position B, the cutout portion 320 comes into surface contact with the outer surface of the connecting portion 1071 and becomes caught, preventing the auxiliary device 300 from moving, and the tip 108a is held at the second position B without returning to the first position A.

[0047] In this embodiment, the number of hole 310 provided in the auxiliary tool 300 is one, but is not limited to this. To enable the auxiliary tool 300 to be shared with different types of switchgear, a hole 340 shown by a dashed line may be provided at a position where the tip of the interlock lever part of a different type of switchgear fits.

[0048] <<Pulling-out and pushing-in operations of the circuit breaker 101 when the auxiliary tool 300 is used>> The following describes an example of an operation performed by an operator when inspecting the circuit breaker 101. It is assumed that the position of the tip 108a of the interlock lever portion 108 is the first position A, which prohibits the circuit breaker 101 from moving.

[0049] First, to ensure that inspection work on the circuit breaker 101 can be carried out safely, it is confirmed whether the circuit breaker 101 is in an open state and the display on the confirmation window 109 is "off."

[0050] Next, when it is confirmed that the display in the confirmation window 109 is "off," the tip 108a of the interlock lever portion 108 is fitted into the hole portion 310 provided at one end of the auxiliary tool 300. At this time, the tip 330a of the side 330 closer to the other end than the notch portion 320 at the other end of the auxiliary tool 300 is placed on the outer circumferential surface of the connecting portion 1071.

[0051] Next, while pinching the tip 108a of the interlock lever portion 108, the tip 108a is lifted and moved along the guide groove 108b from the first position A to the second position B. Note that in FIGS. 6A and 6B, the guide groove 108b is a groove extending in the vertical direction. In the process in which the tip 108a moves to the second position B, the auxiliary tool 300 rotates counterclockwise around the longitudinal axis of the tip 108a, and the notch portion 320 comes into surface contact with the outer peripheral surface of the connecting portion 1071 and becomes hooked on the connecting portion 1071. As a result, the tip 108a is held in the second position B, and the circuit breaker 101 can be pulled out.

[0052] Next, while gripping the handles 107a and 107b, a force is applied in the pull-out direction. As a result, the cart 105 moves in the pull-out direction, and the circuit breaker 101 also moves in the pull-out direction. Then, when the circuit breaker 101 has been pulled out from the connection position where the contacts 102a and 102b of the circuit breaker 101 are connected to the live parts 104a and 104b, respectively, to the disconnection position where the contacts 102a and 102b of the circuit breaker 101 are disconnected from the live parts 104a and 104b, the pulling-out of the circuit breaker 101 is stopped.

[0053] Next, tip 330a of side 330 at the other end of auxiliary tool 300 is pushed slightly upward. As a result, notch 320 moves away from the outer peripheral surface of connecting part 1071, tip 108a returns from second position B to first position A due to its own weight, and tip 330a of side 330 of auxiliary tool 300 once again rides up on the outer peripheral surface of connecting part 1071. This prevents circuit breaker 101 from moving, making it possible to inspect circuit breaker 101.

[0054] Next, when inspection of circuit breaker 101 is completed, tip 108a of interlock lever portion 108 is grasped and moved upward along guide groove 108b from first position A to second position B. At this time, auxiliary tool 300 rotates counterclockwise around the longitudinal axis of tip 108a, and notch portion 320 comes into contact with the outer peripheral surface of connecting portion 1071 and becomes hooked on connecting portion 1071. As a result, tip 108a is held in second position B, making it possible to push in circuit breaker 101.

[0055] Next, while gripping the handles 107a and 107b, a force is applied in the pushing direction. As a result, the cart 105 moves in the pushing direction, and the circuit breaker 101 also moves in the pushing direction. Then, when the circuit breaker 101 has been pushed in from the disconnecting position where the contacts 102a and 102b of the circuit breaker 101 are disconnected from the live parts 104a and 104b, to the connecting position where the contacts 102a and 102b of the circuit breaker 101 are connected to the live parts 104a and 104b, respectively, the pushing of the circuit breaker 101 is stopped.

[0056] Next, tip 330a of side 330 is pushed upward at the other end of auxiliary tool 300. As a result, notch 320 moves away from the outer peripheral surface of connecting part 1071, tip 108a returns from second position B to first position A due to its own weight, and tip 330a of side 330 of auxiliary tool 300 once again rides up on the outer peripheral surface of connecting part 1071. This prevents circuit breaker 101 from moving.

[0057] Finally, the circuit breaker 101 is set to the closed state, and the confirmation window 109 displays "ON."

[0058] <<Summary>> As described above, when contacts 102a, 102b of circuit breaker 101 housed in housing 103 are connected to live parts 104a, 104b, circuit breaker 101 is moved in the push-in direction, which is a direction in which circuit breaker 101 approaches live parts 104a, 104b, and when contacts 102a, 102b of circuit breaker 101 are disconnected from live parts 104a, 104b, circuit breaker 101 is moved in the pull-out direction, which is a direction in which circuit breaker 101 moves away from live parts 104a, 104b. Handles 107a, 107b protrude from front panel 106 and are gripped when moving circuit breaker 101 in the push-in direction and the pull-out direction. Handles 107a, 107b protrude from front panel 106 and are gripped when moving circuit breaker 101 in the push-in direction and the pull-out direction. In the switchgear 1 including an interlock lever section 108 that is operated to change its position from a first position A to a second position B that allows movement of the circuit breaker 101 in the push-in and pull-out directions and that returns to the first position A when the external force holding it at the second position B is removed, an auxiliary device 200 (300) that assists in the operation of the interlock lever section 108 has an elongated shape, and one end of the auxiliary device 200 (300) is provided with a hole 210 (310) (first engagement portion) into which the tip 108a of the interlock lever section 108 is fitted, and the other end of the auxiliary device 200 (300) is provided with a notch 220 (320) (second engagement portion) that catches on the handle section 107a so that the interlock lever section 108 is held at the second position B.

[0059] This allows the circuit breaker 101 to be smoothly moved in the pull-out direction and the push-in direction by a single worker.

[0060] The second position B is located above the first position A.

[0061] This allows the interlock lever portion 108 to return to the first position A reliably when the interlock lever portion 108 is configured to return from the second position B to the first position A under its own weight.

[0062] Furthermore, when the notch 220 (320) is released from the grip portion 107a, the interlock lever portion 108 returns from the second position B to the first position A.

[0063] As a result, when the engagement between the handle portion 107a and the notch portion 220 (320) is released, the interlock lever portion 108 returns to the first position A, making it possible to move the circuit breaker 101 in the pull-out direction and the push-in direction with high accuracy.

[0064] The handles 107a and 107b include a gripping portion 1073 and connecting portions 1071 and 1072 that connect the gripping portion 1073 and the front panel 106, and the notch 220 (320) is hooked onto the outer peripheral surface of the connecting portion 1071.

[0065] This makes it possible to return the interlock lever portion 108 to the first position A simply by performing the simple operation of releasing the notch portion 220 (320) from the outer circumferential surface of the connecting portion 1071.

[0066] Furthermore, when the notch 220 (320) is released from the outer circumferential surface of the connecting portion 1071, the other end of the assisting tool 200 (300) is placed on the outer circumferential surface of the connecting portion 1071.

[0067] This makes it possible to hold the interlock lever portion 108 in the second position B again by a simple operation of hooking the notched portion 220 (320) onto the outer peripheral surface of the connecting portion 1071 again.

[0068] It should be noted that the present embodiment is provided to facilitate understanding of the present invention and is not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and equivalents thereof are also included in the present invention. [Explanation of symbols]

[0069] 1. Switchgear 101 Circuit Breaker 102a,102b Contactor 103 Case 103a Back plate 103b Signboard 104a,104b Live part 105 Cart 105a Mounting plate 105b wheels 106 Front Panel 107a, 107b Handle 108 Interlock lever part 108a tip 108b Guide groove 109 Confirmation window 200,300 Assistive devices 210,310 Hole 220,320 Notch 230,330 sides 1071,1072 Connection part 1073 Gripping part

Claims

1. a front panel that moves the circuit breaker in a push-in direction, which is a direction in which the circuit breaker approaches the charging unit, when connecting contacts of the circuit breaker housed in the housing to the charging unit, and moves the circuit breaker in a pull-out direction, which is a direction in which the circuit breaker moves away from the charging unit, when disconnecting the contacts of the circuit breaker from the charging unit; a handle portion that protrudes from the front panel and is gripped when moving the circuit breaker in the push-in direction and the pull-out direction; an interlock lever portion that protrudes from the front panel, that is operated to change the position from a first position at which movement of the circuit breaker in the push-in direction and the pull-out direction is prohibited to a second position at which movement of the circuit breaker in the push-in direction and the pull-out direction is permitted, and that returns to the first position when an external force that holds the circuit breaker in the second position is removed; In a switchgear including the above, an auxiliary tool for assisting the operation of the interlock lever portion, It has a long shape, One end of the interlock lever has a first engaging portion that engages with the interlock lever portion, The other end has a second engaging portion that engages with the handle portion so that the interlock lever portion engaged with the first engaging portion is held in the second position. Auxiliary equipment.

2. 2. The assistive device according to claim 1, The second position is a position higher than the first position. Auxiliary equipment.

3. The assisting device according to claim 2, When the second engaging portion is disengaged from the handle portion, the interlock lever portion returns from the second position to the first position. Auxiliary equipment.

4. The assisting device according to claim 3, the first engagement portion is a hole portion into which a tip end of the interlock lever portion is fitted, the handle portion includes a grip portion and a connecting portion connecting the grip portion and the front panel, The second engaging portion is a notched portion that comes into contact with the outer circumferential surface of the connecting portion so as to be caught thereon. Auxiliary equipment.

5. The assisting device according to claim 4, When the contact of the notch with the outer circumferential surface of the connecting portion is released, the other end portion is placed on the outer circumferential surface of the connecting portion. Auxiliary equipment.

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