Circuit breaker handle locking device

Abstract

To provide a handle lock device of a circuit breaker capable of hooking a padlock only when a knob unit of a handle is restrained at an OFF position and enhancing work safety.SOLUTION: A handle lock device of a circuit breaker includes: a lock base 10 mounted on an upper surface of a case 4b of the circuit breaker 1; a first locking hole division unit 21 formed in a part of the lock base; a handle lock plate 11 rotatably coupled to the lock base; and a second locking hole division unit 23 formed in a part of the handle lock plate. When the handle lock plate rotates up to a position where a knob unit 8OFF protruding from an upper surface of the case is restrained at an OFF position, the second locking hole division unit moves up to a position continuous with the first locking hole division unit to form a locking hole 30, and a padlock 3 is hooked on the locking hole to restrain the knob unit at the OFF position by the handle lock plate.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a handle locking device for circuit breakers, such as wiring circuit breakers and earth leakage circuit breakers, which are applied as external accessory devices thereto. [Background technology]

[0002] To prevent the operating handle of a circuit breaker mounted on a distribution panel from being accidentally switched from the OFF position (the position in which the main circuit contacts are open) to the ON position (the position in which the main circuit contacts are closed), there is a growing demand for a handle locking device that locks the knob of a rocker-type operating handle in the OFF position.

[0003] Conventional handle locking devices are known in which a locking member locks the knob of the opening / closing handle to the OFF position when a padlock is attached (for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2015-43264 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, conventional handle locking devices have locking holes formed in the frame member, or between the locking member and the frame member, for attaching a padlock. However, even when the knob of the locking member is in the ON position, the padlock can still be attached to the locking hole, which poses a safety issue for the operator.

[0006] Therefore, the present invention aims to provide a handle locking device for a circuit breaker that allows a padlock to be applied only when the handle knob is restrained in the OFF position, thereby improving work safety. [Means for solving the problem]

[0007] To achieve the above objective, a handle lock device for a circuit breaker according to one aspect of the present invention is a handle lock device for locking the knob of a rocker-type opening and closing operating handle protruding from the upper surface of the case of a circuit breaker to the OFF position, comprising a lock base mounted on the upper surface of the case, a first locking hole division portion formed in a part of the lock base, a handle lock plate rotatably connected to the lock base, and a second locking hole division portion formed in a part of the handle lock plate, wherein when the handle lock plate is rotated to a position that restrains the knob to the OFF position, the second locking hole division portion moves to a position continuous with the first locking hole division portion to form a locking hole, and by attaching a padlock to the locking hole, the knob is restrained to the OFF position by the handle lock plate. [Effects of the Invention]

[0008] According to the circuit breaker handle locking device of the present invention, the padlock can be applied only when the knob of the handle is restrained in the OFF position, thereby improving work safety. [Brief explanation of the drawing]

[0009] [Figure 1] This is a plan view showing a circuit breaker according to the present invention. [Figure 2] This is a perspective view showing the steering wheel locking device according to the present invention. [Figure 3] This is a plan view showing the handle lock device according to the present invention installed in the correct position on a circuit breaker. [Figure 4] This is a perspective view showing the steering lock plate, which constitutes the steering lock device, raised within the upper surface area of ​​the cover. [Figure 5] This is a perspective view showing the handle lock plate rotated within the range of the cover's upper surface. [Figure 6] This is a perspective view showing the handle lock plate rotated so that it crosses the handle knob protruding from the cover. [Figure 7] It is a perspective view showing a state where a padlock is applied to the locking hole formed by rotation of the handle lock plate, and the knob is locked at the OFF position. [Figure 8] It is a plan view showing a state where a padlock is applied to the locking hole, and the knob is locked at the OFF position. [Figure 9] It is a perspective view showing a state where a padlock smaller than the padlock shown in FIG. 7 and FIG. 8 is applied to the locking hole, and the knob is locked at the OFF position. [Figure 10] It is a view showing a state where the handle lock device according to the present invention is about to be attached to an incorrect position of a circuit breaker. MODE FOR CARRYING OUT THE INVENTION

[0010] Next, an embodiment according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the ratio of thickness of each layer, and the like are different from actual ones. Therefore, specific thicknesses and dimensions should be determined with consideration of the following description. Further, it goes without saying that the drawings include portions having different dimensional relationships and ratios among each other.

[0011] In addition, the embodiments described below exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention does not limit the material, shape, structure, arrangement, etc. of constituent components to those described below. Various changes can be made to the technical idea of the present invention within the technical scope defined by the claims recited in the claims.

[0012] FIG. 1 is a plan view showing a circuit breaker 1 according to an embodiment, FIG. 2 is a perspective view showing a handle lock device 2 according to an embodiment, FIG. 3 is a plan view showing a state where the handle lock device 2 is attached to the circuit breaker 1, and FIG. 4 is a perspective view showing the handle lock device 2 attached to the circuit breaker 1.

[0013] As shown in Figures 1 and 4, the circuit breaker 1 has a main body case 4 consisting of a box-shaped base 4a and a cover 4b, with three-pole power supply side terminals 5 and load side terminals 6 formed on both sides of the main body case 4. The base 4a and cover 4b are integrated by mounting screws indicated by reference numeral 31. Fixing screws 7a and 7b, which are provided between the poles of the power supply side terminals 5 and load side terminals 6 and penetrate the partition wall, fix the circuit breaker 1 inside the distribution panel. In addition, an opening 4b1 is formed on the upper surface of the cover 4b of the main body case 4, through which the knob 8 of a rocker-type handle 8 for operating the toggle link mechanism (opening / closing mechanism) located inside the main body case 4 is inserted. OFF It protrudes upward from the opening 4b1. Here, reference numeral 8 OFF This indicates the position where the knob has been moved so that the main circuit contact of the circuit breaker 1 is open (OFF position of handle 8). Reference numeral 8 will be described later. ON This indicates the position where the knob has moved so that the main circuit contact is closed (handle 8 is in the ON position).

[0014] In Figure 1, a portion of the cover 4b located to the right of the fixing screw 7a has a power supply side engaging portion 9a into which the power supply side mounting screw 14 of the handle lock device 2 (described later) engages, and a portion of the cover 4b located to the left of the fixing screw 7b has a load side engaging portion 9b into which the load side mounting screw 16 of the handle lock device 2 engages. These power supply side engaging portion 9a and load side engaging portion 9b are blind holes in which internally formed female threads are closed off by resin covers.

[0015] As shown in Figure 2, the steering wheel lock device 2 comprises a lock base 10 made of a metal plate, a steering wheel lock plate 11, and a plate rotating member 12.

[0016] The locking base 10 comprises a pair of first frames 10a, 10b extending parallel to each other, and a pair of second frames 10c, 10d that are bent in the same direction from both ends of the pair of first frames 10a, 10b and connect the first frames 10a, 10b to each other, and has a rectangular opening 10e enclosed by the pair of first frames 10a, 10b and the pair of second frames 10c, 10d. On one side of the second frame 10c, there is a power supply side connecting portion 13 with a through hole, a power supply side mounting screw 14 whose head engages with the power supply side connecting portion 13 and is inserted through the through hole, and a spacer (not shown) that is continuous with the lower part of the power supply side connecting portion 13 and through which the upper part of the threaded portion of the power supply side mounting screw 14 is inserted. Furthermore, the other side, the second frame 10d, is also provided with a load-side connecting portion 15 with a through hole, a load-side mounting screw 16 whose head engages with the load-side connecting portion 15 and is inserted through the through hole, and a spacer 17 through which the upper part of the threaded portion of the load-side mounting screw 16 is inserted, continuous with the lower part of the load-side connecting portion 15.

[0017] On one of the first frames 10a of the lock base 10, a first plate 18 rises at a position close to the power supply side connection portion 13 on the edge facing the opening 10e, and a second plate 20 rises at a position close to the load side connection portion 15, separated from the first plate 18 by a slit 19. At the upper end of the second plate 20 on the side facing the first plate 18, a first lock hole division portion 21 is provided, which extends in a rod shape, bent at a right angle from the second plate 20 in a direction away from the opening 10e. In addition, a mis-installation prevention projection 22 is formed on the other first frame 10b of the lock base 10, projecting toward the opening 10e.

[0018] The handle lock plate 11 is a long member, with a second lock hole division portion 23 formed by cutting out a U-shape on one end in the longitudinal direction, and an OFF position confirmation portion 24 extending perpendicularly from the edge in the central part in the longitudinal direction.

[0019] The plate rotating member 12 is a member formed by bending a flat plate member into an L-shape and comprising a first rotating member 25 and a second rotating member 26. The first rotating member 25 abuts against the upper surface of the other first frame 10b on the power supply side connecting portion 13 side and is connected to a first rotating shaft 27 whose axis extends in the vertical direction in Figure 2, thereby rotatably positioned on the other first frame 10b. The second rotating member 26 abuts against the other end surface of the handle lock plate 11, which is positioned so that the OFF position confirmation portion 24 faces the opening 10e side and the second locking hole division portion 23 opens at the top of Figure 2, and is connected to a second rotating shaft 28 whose axis is perpendicular to the first rotating shaft 27, thereby rotatably supporting the handle lock plate 11.

[0020] Next, Figure 3 shows the handle lock device 2 with the above configuration installed in the correct position on the circuit breaker 1.

[0021] The handle lock device 2 is mounted in the correct position on the circuit breaker 1 by screwing the power supply side mounting screw 14 of the power supply side connecting part 13 of the handle lock device 2 into the female thread of the power supply side engaging part 9a of the circuit breaker 1 located inside the distribution panel, and screwing the load side mounting screw 16 of the load side connecting part 15 into the female thread of the load side engaging part 9b of the circuit breaker 1.

[0022] Next, the padlocks 3 and 3S are attached to the handle lock device 2 mounted on the circuit breaker 1, and the knob portion 8 of the handle 8 is closed. OFF The procedure for locking the device to the OFF position will be explained with reference to Figures 4 to 9.

[0023] First, as shown in Figure 4, the handle lock plate 11 is rotated 90° around the second rotation axis 28 (action A, indicated by the dashed arrow in Figure 4), and the handle lock plate 11 is raised from the other first frame 10b of the lock base 10. Next, as shown in Figure 5, the plate rotation member 12 is rotated 90° around the first rotation axis 27 (action B, indicated by the dashed arrow in Figure 5), and the OFF position confirmation part 24 of the raised handle lock plate 11 is directed toward the opening 4b1 of the cover 4b. Next, the handle lock plate 11 is rotated 90° around the second rotation axis 28 (action C, indicated by the dashed arrow in Figure 6), and the tip of the handle lock plate 11 is inserted into the slit 19. Thus, the operation of the handle lock plate 11 shown in Figures 4 to 6 is performed within the range that does not protrude from the upper surface of the cover 4b of the main body case 4.

[0024] Here, if the knob of handle 8 is in the ON position, the knob 8 ON The OFF position confirmation part 24 of the handle lock plate 11 interferes with the slit 19, so the tip of the handle lock plate 11 cannot be inserted into the slit 19, and the knob part 8 of the handle 8 ON It can be confirmed that it is in the ON position. As shown in Figure 6, the knob part 8 of the handle 8 OFF When the valve is in the OFF position and the tip of the handle lock plate 11 is inserted into the slit 19, the handle lock plate 11 is positioned across the opening 4b1 of the cover 4b. Then, as shown in Figure 6, the second lock hole division portion 23 approaches the first lock hole division portion 21, and the straight first lock hole division portion 21 closes the U-shaped opening of the second lock hole division portion 23, thereby forming a roughly semicircular lock hole 30.

[0025] Next, as shown in Figure 7, the shackle 3a of the padlock 3 is inserted through the lock hole 30 formed by the second lock hole division 23 and the first lock hole division 21, and the padlock 3 is attached. As shown in Figure 8, the handle lock plate 11 positioned across the opening 4b1 is attached to the knob portion 8 of the handle 8. OFF This restrains the movement upward (to the ON position of handle 8).

[0026] Here, FIG. 9 shows a state where a small padlock 3S having a shackle 3Sa with a smaller diameter than the shackle 3a of the padlock 3 is hung on the locking hole 30. In this case, when the shackle 3Sa with a smaller diameter passes through, the handle lock plate 11 rotates around the second rotating shaft 28, reducing the diameter of the locking hole 30. However, the handle lock plate 11 is maintained in a state crossing the opening 4b1, and the knob 8 of the handle 8 OFF is restricted from moving upward in FIG. 8 (moving to the ON position of the handle 8).

[0027] As described above, in the handle lock device 2 of the present embodiment, when the knob 8 of the handle 8 OFF is in the OFF position, the handle lock plate 11 crosses the opening 4b1, and the knob 8 of the handle 8 OFF is restrained at the OFF position. Then, the locking hole 30 is formed by the first locking hole dividing portion 21 formed on the second plate 20 of the lock base 10 and the second locking hole dividing portion 23 of the handle lock plate 11. Therefore, the padlock 3 can be hung on the locking hole 30 only when the handle lock plate 11 restrains the knob 8 of the handle 8 OFF at the OFF position, so that work safety can be improved.

[0028] In addition, when a small padlock 3S with a smaller diameter shackle 3a is used instead of the padlock 3 with a larger diameter shackle 3a, the handle lock plate 11 rotates around the second rotating shaft 28, but crosses the opening 4b1 to restrict the knob 8 of the handle 8 OFF at the OFF position, and allows the small padlock 3S to be hung on the locking hole 30. Therefore, even when the small padlock 3S is used, work safety can be sufficiently improved.

[0029] Furthermore, the operation of rotating the handle lock plate 11 of the handle lock device 2 around the second rotation axis 28 to raise it, and the operation of rotating the handle lock plate 11 around the first rotation axis 27 to change its orientation, are performed within a range that does not protrude from the upper surface of the cover 4b of the main case 4. As a result, when multiple circuit breakers 1 are arranged in a row on the rails of the distribution board, and each circuit breaker 1 is equipped with a handle lock device 2, it is possible to operate its own handle lock plate 11 and attach a padlock 3 to the locking hole 30 without affecting the operation of adjacent circuit breakers 1.

[0030] Here, Figure 10 shows the knob portion 8 of the handle 8. ON This figure shows a situation where the handle lock device 2 of this embodiment is being mistakenly attached to a circuit breaker 1 that is in the ON position. Specifically, the load-side mounting screw 16 of the load-side connecting part 15 is being engaged with the power supply-side engaging part 9a (see Figure 1) of the circuit breaker 1, and the power supply-side mounting screw 14 of the power supply-side connecting part 13 is being engaged with the load-side engaging part 9b (see Figure 1) of the circuit breaker 1, thus attempting to mistakenly attach the handle lock device 2.

[0031] If this handle lock device 2 is incorrectly attached to the circuit breaker 1, the mis-attachment prevention projection 22 protruding from the other first frame 10b of the lock base 10 is positioned to cross the opening 4b1 of the cover 4b, and the knob portion 8 of the handle 8, which is in the ON position, is positioned correctly. ON Because it interferes with the circuit breaker, the handle lock device 2 cannot be attached to the circuit breaker 1.

[0032] Therefore, even if someone attempts to incorrectly install the handle lock device 2 of this embodiment onto the circuit breaker 1, the knob portion 8 of the handle 8, which is in the ON position, will not be affected by the incorrect installation prevention projection 22. ON Because it interferes with the steering wheel lock device 2, it can prevent incorrect installation. Also, the knob on the handle is in the OFF position (knob part 8 OFFIf the handle lock device 2 of this embodiment is mistakenly attached to the circuit breaker 1 located at ), the mis-attachment prevention projection 22 is positioned to cross the opening 4b1 of the cover 4b, and this mis-attachment prevention projection 22 moves the handle knob to the ON position (knob 8 ON It is found that the steering wheel lock device 2 has been incorrectly installed in order to prevent ) [Explanation of Symbols]

[0033] 1 Circuit breaker 2. Steering wheel locking device 3 Padlocks 3a Crane 3S Small Padlock 3Sa Tsuru 4. Main unit case 4a Bass 4b Cover (Case) 4b1 opening 5 Power supply side terminal section 6. Load-side terminal section 7a, 7b Fixing screws 8 handles 8 OFF Thumb part 9a Power supply side engagement part 9b Load side engagement part 10 Locking base 11 Handle lock plate 12 Plate Rotating Member 10a, 10b First frame 10c, 10d Second frame 10e opening 13 Power supply side connection part 14. Power supply mounting screws 15 Load side connection part 16 Load-side mounting screws 17 Spacers 18 Plate 1 19 slits 20 Second Plate 21 1st lock hole division part 22 Protrusion to prevent incorrect installation 23 2nd lock hole division 24 OFF position confirmation part 25 First Rotating Member 26 Second Rotating Member 27. First rotation axis 28. Second rotation axis 30 locking holes 31 Mounting screws

Claims

1. A handle locking device that locks the knob of a rocker-type opening / closing operating handle protruding from the top surface of the case of a circuit breaker to the OFF position, A locking base is attached to the top surface of the aforementioned case, A first locking hole division portion formed in a part of the lock base, A handle lock plate is rotatably connected to the aforementioned lock base, The handle lock plate comprises a second locking hole division portion formed in a part of the handle lock plate, When the handle lock plate is rotated to a position that restrains the knob in the OFF position, the second lock hole division moves to a position continuous with the first lock hole division, thereby forming a lock hole. By attaching a padlock to the aforementioned locking hole, the handle lock plate is used to restrain the knob in the OFF position. The base end of the handle lock plate is connected to the lock base via a rotating member, and a second locking hole division is formed at the tip of the handle lock plate. The rotating member comprises a first rotation axis whose axis extends in a direction perpendicular to the upper surface of the case, and a second rotation axis whose axis extends in a direction along the upper surface of the case. A handle locking device for a circuit breaker, characterized in that the handle lock plate is rotated around the first and second rotation axes of the rotating member to a position that restrains the knob in the OFF position.

2. A handle locking device for locking the knob portion of a rocker-type opening / closing operating handle protruding from the upper surface of the case of a circuit breaker to the OFF position, A locking base is attached to the top surface of the aforementioned case, A first locking hole division portion formed in a part of the lock base, A handle lock plate is rotatably connected to the aforementioned lock base, The handle lock plate comprises a second locking hole division portion formed in a part of the handle lock plate, When the handle lock plate is rotated to a position that restrains the knob in the OFF position, the second lock hole division moves to a position continuous with the first lock hole division, thereby forming a lock hole. By attaching a padlock to the aforementioned locking hole, the handle lock plate is used to restrain the knob in the OFF position. The first locking hole division portion is a rod-shaped portion provided on the lock base, The second locking hole division is a portion formed by cutting out a U-shape in the handle lock plate. A circuit breaker handle locking device characterized in that the locking hole is formed when the rod-shaped portion of the first locking hole division closes the U-shaped opening side of the second locking hole division.

3. The handle locking device for a circuit breaker according to claim 1 or 2, characterized in that the handle lock plate is provided with an OFF position confirmation part for confirming that the knob is in the OFF position.

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