Circuit breaker handle locking device

Abstract

To provide a handle lock device of a circuit breaker, capable of enhancing a work safety.SOLUTION: By inserting slide pins 26a and 26b into a first length hole 20 of a chain plate 18 and a second length hole 25 of a lock plate 12, and coupling them to a slide part 21, a handle catch 11 and the lock plate are slidably arranged in a movement direction of a cropping part against the chain plate. At an OFF position of the cropping part, a second chain hole of the slide part and a first chain hole of the chain plate are communicated, and at an ON position of the cropping part, the second chain hole is blocked by the chain plate. Then, the lock plate is moved to a cropping direction while blocking the first long hole of the chain plate.SELECTED DRAWING: Figure 4

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

[0003] [Patent Document 1] Japanese Patent Publication No. 2015-43264 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] Conventional handle locking devices pose a safety risk in terms of operation because, even when the knob of the opening / closing handle is in the ON position, if there is a hole in a location other than the locking hole for the padlock or hasp, the padlock or hasp may be attached to that hole. Furthermore, when a small padlock is attached to lock the knob in the OFF position, the knob may move to the position where it switches to the ON position, which also poses a safety issue for the operator.

[0005] Therefore, the present invention aims to provide a handle locking device for a circuit breaker that can improve work safety. [Means for solving the problem]

[0006] To achieve the above objective, a handle locking device for a circuit breaker according to one aspect of the present invention is a handle locking 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 locking plate having a first locking hole and a first elongated hole formed along the direction of movement of the knob, mounted on the upper surface of the case; a handle catch having a slide portion having a second locking hole and a catch portion for holding the knob; and a locking plate having a second elongated hole, wherein the first elongated hole of the locking plate and By inserting a sliding pin through the second elongated hole of the lock plate and connecting it to the sliding part, the handle catch and lock plate are supported to slide freely in the direction of movement of the knob relative to the locking plate. In the OFF position of the knob, the second locking hole of the sliding part and the first locking hole of the locking plate are in communication, allowing the shackle or hasp of a padlock to be attached. In the ON position of the knob, the second locking hole is closed by the locking plate, and the lock plate moves in the direction of the knob while blocking the first elongated hole of the locking plate. [Effects of the Invention]

[0007] The circuit breaker handle locking device according to the present invention can improve the safety of the circuit breaker during operation. [Brief explanation of the drawing]

[0008] [Figure 1] This perspective view shows a circuit breaker fitted with the handle locking device of the first embodiment, where, when the knob of the rocker-type opening / closing handle is in the OFF position, the first locking hole of the locking plate and the second locking hole of the handle catch are in communication, allowing the circuit breaker to be locked with a padlock or hasp. [Figure 2] This is a perspective view showing the configuration of the steering wheel lock device according to the first embodiment. [Figure 3]In the handle lock device of the first embodiment, when the handle catch moves to the OFF position of the knob part or the ON position of the knob part, it shows a state where the lock plate closes a place where the chain of the padlock or the latch of the hasp can pass through. [Figure 4] It is a figure which shows the state which the 1st lock hole of the lock plate of the handle lock device of 1st Embodiment and the 2nd locking hole of a handle catch are connected, and the chain of the padlock is locked when the knob part of a circuit breaker is in the OFF position. [Figure 5] It is a perspective view which shows the state which the knob part of a circuit breaker moves to the ON position, the 1st lock hole of the lock plate of the handle lock device of 1st Embodiment and the 2nd locking hole of a handle catch do not communicate, and it is impossible to hang the chain of the padlock. [Figure 6] It is a figure which shows the state which a lock plate closes the place where the chain of a padlock can pass through when the 1st lock hole of the lock plate of the handle lock device of 1st Embodiment and the 2nd locking hole of a handle catch do not communicate. [Figure 7] It is a perspective view which shows the structure of the handle lock device of 2nd Embodiment. [Figure 8] It is a figure which shows the structure of the handle lock device of 2nd Embodiment. [Figure 9] It is a figure which shows the shape of the lock plate which comprises the handle lock device of 2nd Embodiment. [Figure 10] It is a perspective view which shows the state which the 1st lock hole of the lock plate of the handle lock device of 2nd Embodiment and the 2nd locking hole of a handle catch are connected when the knob part of a circuit breaker is in the OFF position. [Figure 11] It is a figure which shows the state which the chain of a padlock is locked when the 1st lock hole of the lock plate of the handle lock device of 2nd Embodiment and the 2nd locking hole of a handle catch are connected. [Figure 12] It is a perspective view which shows the state which the knob part of a circuit breaker moves to the ON position, the 1st lock hole of the lock plate of the handle lock device of 2nd Embodiment and the 2nd locking hole of a handle catch do not communicate, and it is impossible to hang the chain of the padlock. [Figure 13] This is an enlarged view of the main part showing a state in which the first locking hole of the locking plate of the handle lock device of the second embodiment and the second locking hole of the handle catch are not in communication. [Figure 14] This diagram shows a handle lock device of the second embodiment, in which, when a small padlock is attached to lock the knob in the OFF position, the handle catch that holds the knob restricts the knob from moving to the position where it switches to the ON position. [Modes for carrying out the invention]

[0009] Next, embodiments of the present invention will be described with reference to the drawings. In the following drawings, identical 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 the thickness of each layer, etc., may differ from reality. Therefore, specific thicknesses and dimensions should be determined by referring to the following explanation. Furthermore, it should be noted that there are parts where the relationships and ratios of dimensions differ between drawings. Furthermore, the embodiments described below illustrate devices and methods for realizing the technical concept of the present invention, and the technical concept of the present invention does not limit the materials, shapes, structures, arrangements, etc. of the components to those described below. The technical concept of the present invention can be modified in various ways within the technical scope defined by the claims described in the patent claims.

[0010] [First Embodiment] Figures 1 to 6 show the handle lock device 2 of the first embodiment attached to the circuit breaker 1. As shown in Figure 1, the circuit breaker 1 has a main body case 4 consisting of a box-shaped base 4a and a cover 4b, and a 3-pole power supply side terminal section 5 and a load side terminal section 6 are formed on both sides of the main body case 4.

[0011] The circuit breaker 1 is positioned inside the distribution panel by inserting fixing screws (not shown) through screw holes 7a and 7b provided between the poles of the power supply side terminal section 5 and the load side terminal section 6, and screwing them into the distribution panel. An opening 4c is formed on the upper surface of the cover 4b of the main body case 4, and the knob 8 of the rocker-type handle that operates the toggle link mechanism (opening / closing mechanism) located inside the main body case 4 protrudes upward from the opening 4c. Here, reference numeral 8 denotes 8. OFF This indicates the position where the knob 8 is set to OFF so that the main circuit contact of the circuit breaker 1 is open (hereinafter, OFF position 8). OFF (This is referred to as...). Note that the reference numeral 8 will be described later. ON This indicates the position where the knob 8 is set to the ON position so that the main circuit contacts are closed (hereinafter, ON position 8). ON (It is called that.)

[0012] On the right side of the screw hole 7a formed in the cover 4b, a power supply side engaging portion is formed, into which the power supply side mounting screw 14 of the handle lock device 2 (described later) engages. On the left side of the screw hole 7b, a load side engaging portion is formed, into which the load side mounting screw 16 of the handle lock device 2 (described later) engages. These power supply side engaging portion and load side engaging portion are blind holes with internally formed female threads that are closed off by resin covers.

[0013] As shown in Figure 2(a), the handle lock device 2 comprises a lock frame 10, a handle catch 11, and a lock plate 12, all made of metal sheet material. The lock frame 10 comprises a pair of long first frames 10a, 10b extending parallel to each other, and a pair of second frames 10c, 10d that extend parallel to each other and are connected at both longitudinal ends of the pair of first frames 10a, 10b. A rectangular opening 10e is provided, 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 of the lock frame 10, there is a power supply side connecting portion 13 with a through hole, and 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. On the second frame 10d side of the lock frame 10, there is a load side connecting portion 15 with a through hole, and a load side mounting screw 16 whose head engages with the load side connecting portion 15 and is inserted through the through hole.

[0014] As shown in Figure 2(b), a locking plate 18 continuously rises from the edge on the opening 10e side of one of the first frames 10a of the lock frame 10. A first locking hole 19 is formed in the longitudinal center of the locking plate 18, and a first elongated hole 20 is formed below the first locking hole 19, along the direction in which one of the first frames 10a extends.

[0015] As shown in Figure 2(a), the handle catch 11 is a component formed by bending a metal plate into an L-shape and comprising a sliding portion 21 and a catch portion 22 that are perpendicular to each other. The sliding portion 21 has a second locking hole 23 which has the same hole shape as the first locking hole 19 of the locking plate 18. The catch portion 22 includes a hole portion 24a surrounding the knob portion 8, and an engaging projection 24b that protrudes from the edge of the hole portion 24a and engages with a part of the knob portion 8.

[0016] As shown in Figure 3(a), the lock plate 12 is a long metal plate, and its longitudinal dimension is shorter than the first elongated hole 20 of the locking plate 18, while a second elongated hole 25 is formed therein, which has the same transverse dimension as the first elongated hole 20. The lock plate 12 is positioned between the locking plate 18 and the sliding portion 21 with the second elongated hole 25 facing the first elongated hole 20 of the locking plate 18. As shown in Figure 2(b), two sliding pins 26a and 26b are inserted through the first elongated hole 20 and the second elongated hole 26 from the locking plate 18 side. The heads of the two sliding pins 26a and 26b engage with the opening periphery of the first elongated hole 20, and as shown in Figure 2(b), the tips of the two sliding pins 26a and 26b pass through the sliding portion 21 and are crimped and fixed to the sliding portion 21. As a result, the lock plate 12 is slidably positioned relative to the locking plate 18 via two sliding pins 26a and 26b.

[0017] Here, Figures 3(a) and 3(b) show the movement positions of the lock plate 12 as the two sliding pins 26a and 26b move to the left and right sides of the figure as the slide portion 21 moves. As shown in Figure 3(a), when the lock plate 12 moves to the left, the end of the first elongated hole 20 of the locking plate 18 opens as a hole 20a at the right end of the lock plate 12. This hole 20a is a small opening through which the shackle or hasp latch of a padlock cannot pass. Also, as shown in Figure 3(b), when the lock plate 12 moves to the right, the end of the first elongated hole 20 of the locking plate 18 opens as a hole 20b at the left end of the lock plate 12. This hole 20b is also a small opening through which the shackle or hasp latch of a padlock cannot pass.

[0018] As shown in Figure 1, the handle lock device 2 with the above configuration is attached to the circuit breaker 1 by inserting the knob 8 into the hole 24a of the catch part 22, screwing the power supply side mounting screw 14 of the power supply side connecting part 13 into the power supply side engaging part of the circuit breaker 1 located inside the panel of the distribution board, and screwing the load side mounting screw 16 of the load side connecting part 15 into the load side engaging part of the circuit breaker 1.

[0019] Figures 1 and 4 show the arrangement of the handle locking device 2 when the grip portion 8 of the circuit breaker 1 is in the OFF position 8 OFF As shown in the figure, when in the OFF position 8 OFF the grip portion 8 is inserted into the hole portion 24a. In the OFF position, the grip portion 8 OFF of the OFF position 8 and the catch portion 22 of the handle catch 11 are located on the left side of FIG. 1. At this time, the first locking hole 19 of the locking plate 18 and the second locking hole 23 of the slide portion 21 are in communication, and the wire 27a of the padlock 27 can be inserted through the first locking hole 19 and the second locking hole 23 to lock the padlock. Also, as shown in FIG. 4, the lock plate 12 closes most of the first elongated hole 20 of the locking plate 18, and a part of the first elongated hole 20 opens as a hole portion 20a on the right end side of the lock plate 12, but it is a small hole portion 20a through which the wire or hasp of the padlock cannot pass as described above.

[0020] Also, FIGS. 5 and 6 show the arrangement of the handle locking device 2 when the grip portion 8 of the circuit breaker 1 is in the ON position 8 ON As shown in FIG. 6, when the catch portion 22 of the handle catch 11 moves to the right side of FIG. 6 due to the ON position 8 of the grip portion 8, the first locking hole 19 of the locking plate 18 and the second locking hole 23 of the slide portion 21 are not in communication, and it becomes impossible to lock the padlock. Also, as shown in FIG. 6, the lock plate 12 closes most of the first elongated hole 20, and a part of the first elongated hole 20 opens as a hole portion 20b on the left end side of the lock plate 12, but it is a small hole portion 20b through which the wire or hasp of the padlock cannot pass as described above.

[0021] Therefore, in the handle locking device 2 of the present embodiment, only when the grip portion 8 of the circuit breaker 1 is moving to the OFF position 8 OFF the first locking hole 19 of the locking plate 18 and the second locking hole 23 of the slide portion 21 are in communication, so that the wire 27a of the padlock 27 can be hung to lock the padlock, and the hole portion (for example, the first elongated hole 20 of the locking plate 18) where it is easy to misattach the wire of the padlock is closed by the lock plate 12, so that the working safety can be enhanced.​​

[0022] In this embodiment, we have described an embodiment in which the shackle 27a of the padlock 27 is attached to the first locking hole 19 of the communicating locking plate 18 and the second locking hole 23 of the sliding part 21 to perform the locking. However, even when the hasp latch is attached to the communicating first locking hole 19 and second locking hole 23 to perform the locking, the hole where the hasp latch is easily misattached (for example, the first elongated hole 20 of the locking plate 18) is closed by the lock plate 12, thereby improving safety during operation.

[0023] [Second Embodiment] Next, Figures 7 to 14 show the structure of the handle lock device 30 of the second embodiment, which is attached to the circuit breaker 1. As shown in Figures 7(a), (b) and 8, the handle lock device 30 includes a lock frame 31, a handle catch 32, and a lock plate 33, all made of metal sheet material.

[0024] The lock frame 31 comprises a pair of first frames 31a, 31b and a pair of second frames 31c, 31d that are connected at both longitudinal ends of the pair of first frames 31a, 31b and extend parallel to each other, and has a rectangular opening 31e enclosed by the pair of first frames 31a, 31b and the pair of second frames 31c, 31d. On the second frame 31c side of the lock frame 31, there is a power supply side connecting portion 34 with a through hole and a power supply side mounting screw 35 whose head engages with the power supply side connecting portion 34 and is inserted through the through hole. On the second frame 31d side of the lock frame 31, there is a load side connecting portion 36 with a through hole and a load side mounting screw 37 whose head engages with the load side connecting portion 36 and is inserted through the through hole.

[0025] As shown in Figure 7(b), a locking plate 38 continuously rises from the edge on the opening 31e side of one of the first frames 31a of the lock frame 31. A first locking hole 39 is formed in the locking plate 38, and a first elongated hole 40 is formed along the direction in which the first frame 31a extends. As shown in Figure 7(a), the handle catch 32 is a component formed by bending a metal plate into an L-shape and comprising a rectangular sliding portion 41 and a catch portion 42 that are perpendicular to each other. The sliding portion 41 has a second locking hole 43 which has the same hole shape as the first locking hole 19 of the locking plate 18, and a second elongated hole 44 which extends in the longitudinal direction of the sliding portion 41, continuously from a part of the second locking hole 43. The catch portion 42 has an engaging portion 42a which surrounds the knob portion 8.

[0026] The first sliding pin 45 is inserted through the first elongated hole 40 from the locking plate 38 side. The head of the first sliding pin 45 engages with the opening edge of the first elongated hole 40, and the tip of the first sliding pin 45 passes through the sliding portion 41 and is crimped and fixed to the sliding portion 41. The second sliding pin 46 is inserted through the second elongated hole 44 from the sliding portion 41 side. The head of the second sliding pin 46 engages with the opening edge of the second elongated hole 44, and the tip of the second sliding pin 46 passes through the locking plate 38 and is crimped and fixed to the locking plate 38.

[0027] In Figure 8, the component shown by the dashed line is the lock plate 33 positioned between the locking plate 38 and the sliding portion 41. As shown in Figure 9, the lock plate 33 includes a shaft hole 33a, a slit 33b formed on a straight line passing through the center of the shaft hole 33a, and an outwardly protruding engaging projection 33c. The shaft portion according to the present invention corresponds to the shaft hole 33a. As shown in Figure 8, the lock plate 33 is positioned between the lock plate 38 and the slide portion 41 such that the second sliding pin 46 is inserted through the shaft hole 33a, the first sliding pin 45 is inserted through the slit 33b, and the engaging projection 33c protrudes toward the second lock hole 43. When the slide portion 41 moves to the right from the position in Figure 8, the first sliding pin 45 also moves to the right in the longitudinal direction of the first elongated hole 40. When the first sliding pin 45, which has moved to the right, contacts the slit 33b of the lock plate 33, the lock plate 33 rotates counterclockwise around the second sliding pin 46 as the center of rotation. The second sliding pin 46 may be integrally provided in the axial hole 33a of the lock plate 33.

[0028] As shown in Figure 10, the handle lock device 30 with the above configuration is attached to the circuit breaker 1 by engaging the knob 8 with the engaging portion 42a of the catch portion 42, screwing the power supply side mounting screw 35 of the power supply side connecting portion 34 into the power supply side engaging portion of the circuit breaker 1 located inside the distribution board, and screwing the load side mounting screw 37 of the load side connecting portion 36 into the load side engaging portion of the circuit breaker 1. Figures 10 and 11 show the knob 8 of the circuit breaker 1 in the OFF position 8 OFF This shows the arrangement of the steering lock device 30 when it is set to OFF position 8. OFF The knob portion 8 engages with the engaging portion 42a, and in the OFF position, OFF position 8 OFF The knob portion 8 and the catch portion 42 of the handle catch 32 are located on the left side of Figure 11. At this time, the first locking hole 39 of the locking plate 38 and the second locking hole 43 of the sliding portion 41 are in communication, and the padlock 27 can be attached by inserting the shackle 27a through the first locking hole 39 and the second locking hole 43.

[0029] Furthermore, Figures 12 and 13 show the knob 8 of the circuit breaker 1 in the ON position 8 ON This shows the arrangement of the handle lock device 2 when it is set to ON position 8. ON As a result, when the catch portion 42 of the handle catch 32 moves to the right side in Figure 13, the first locking hole 39 of the locking plate 38 and the second locking hole 43 of the sliding portion 41 are no longer in communication, making it impossible to lock the padlock.

[0030] Next, Figure 14 illustrates the case in which the handle lock device 30 of this embodiment locks the circuit breaker 1 by using a smaller padlock 47 with a smaller shackle diameter 47a, instead of the larger padlock 27 with a larger shackle diameter 27a shown in Figure 11. OFF Turn the knob 8 (see Figure 11) to the ON position 8 ONAs it moves to the side (right side in Figure 14), the handle catch 32 moves to the right side in Figure 14 until the edge of the second locking hole 43 of the slide part 41 engages with the shackle 47a, and the first sliding pin 45 connected to the handle catch 32 also moves to the right side of the first elongated hole 40. At this point, when the handle catch 32 moves further to the right and the first sliding pin 45 also moves to the position indicated by reference numeral 45P (knob switching position), it returns to the OFF position 8 OFF The knob 8 is moved to the ON position 8 by operating the toggle link mechanism. ON There is a risk that it will switch to this.

[0031] In this embodiment, the handle lock device 30 has a knob 8 in the OFF position 8 OFF From ON position 8 ON When moved to the side (right side in Figure 14), the first sliding pin 45 moves to the right of the first elongated hole 40 and comes into contact with the slit 33b of the lock plate 33, causing the lock plate 33 to rotate counterclockwise around the second sliding pin 46 as the center of rotation. As the lock plate 33 rotates counterclockwise, the engaging projection 33c comes into contact with a part of the shackle 47a of the padlock 47. Then, the knob 8 is moved to the ON position 8 ON Even if you try to move it further to the side, the counterclockwise rotation of the lock plate 33 is restricted, preventing the first sliding pin 45 from moving to the knob switching position 45P. As a result, the knob 8 is in the ON position 8 ON The movement of the catch portion 42 of the handle catch 32 is restricted until it reaches the position where it switches.

[0032] Therefore, even when using a small padlock 47 with a small shackle diameter 47a to lock the handle lock device 30 of this embodiment, the knob 8 can be moved to the OFF position 8. OFF From ON position 8 ON Even when moved to the side, the lock plate 33 remains in the ON position 8 ON By restricting the movement of the knob 8 to the position where it switches, work safety can be improved. Furthermore, in this embodiment, the handle lock device 30, similar to the first embodiment, allows the knob 8 of the circuit breaker 1 to be in the OFF position 8 OFFOnly when moving is the first locking hole 39 of the locking plate 38 and the second locking hole 43 of the sliding part 41 in communication, so the shackle 27a of the padlock 27 (or the shackle 47a of the padlock 47) can be attached to lock the device, thereby improving safety during operation.

[0033] Furthermore, although Figure 11 of the second embodiment describes an embodiment in which the shackle 27a of the padlock 27 is attached to the first locking hole 39 of the communicating locking plate 38 and the second locking hole 43 of the sliding part 41 to lock it, the same effect can be achieved even when the latch of a hasp is attached to the communicating first locking hole 39 and second locking hole 43 to lock it. Furthermore, although Figure 14 of the second embodiment describes the case in which the handle lock device 30 locks the circuit breaker 1 using a small padlock 47 with a small diameter shackle 47a, the lock can also be performed by placing a small hasp latch on the communicating first lock hole 39 and second lock hole 43 when the lock plate 33 is in the ON position 8 ON By restricting the movement of the knob 8 to the position where it switches, work safety can be improved. [Explanation of Symbols]

[0034] 1 Circuit breaker 2. Steering wheel locking device 4. Main unit case 4a Bass 4b Cover (Case) 4c opening 5 Power supply side terminal section 6. Load-side terminal section 7a, 7b Screw holes 8. Thumb part 8 OFF OFF position of the knob 8 ON ON position of the knob 10 Lock Frames 10a, 10b First frame 10c, 10d Second frame 10e opening 11 Handle Catch 12 Lock Plate 13 Power supply side connection part 14. Power supply mounting screws 15 Load side connection part 16 Load-side mounting screws 18 Locking plate 19 First locking hole 20 1st long hole 21 Slide section 22 Catch Section 23 Second locking hole 24a Hole 24b Engagement protrusion 25 2nd long hole 26a, 26b Sliding pins 30. Steering wheel lock device 31 Lock Frame 31a, 31b First frame 31c, 31d Second frame 31e opening 32 Handle Catch 33 Lock Plate 33a Shaft hole (shaft portion) 33b Slit 33c Engagement protrusion, 34 Power supply side connection part 35 Power supply side mounting screws 36 Load side connection part 37 Load-side mounting screw 38 Locking Plate 39 First locking hole 40 1st long hole 41 Slide section 42 Catch section 42a Engagement part 43 Second locking hole 44 2nd long hole 45. First sliding pin 45P Knob switching position 46. ​​Second sliding pin 47 Small padlock 47a Small diameter vine

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 plate is mounted on the upper surface of the case, with a first locking hole formed therein and a first elongated hole formed along the direction of movement of the knob. A handle catch having a sliding portion with a second locking hole formed therein and a catch portion that holds the knob, A lock plate having a second elongated hole formed therein, By inserting a sliding pin through the first elongated hole in the locking plate and the second elongated hole in the lock plate and connecting them to the sliding portion, the handle catch and the lock plate are supported relative to the locking plate so as to be slidable in the direction of movement of the knob portion. In the OFF position of the knob, the second locking hole of the slide and the first locking hole of the locking plate are in communication, allowing the shackle or hasp of a padlock to be attached, and in the ON position of the knob, the second locking hole is closed by the locking plate, The handle locking device for a circuit breaker is characterized in that the lock plate moves in the direction of movement of the knob while blocking the first elongated hole of the locking plate.

2. 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 plate is mounted on the upper surface of the case, with a first locking hole formed therein and a first elongated hole formed along the direction of movement of the knob. A handle catch having a sliding portion having a second locking hole and a second elongated hole communicating with the second locking hole, and a catch portion for holding the knob, It comprises a lock plate with a shaft portion formed therein, The first sliding pin is inserted through the first elongated hole of the locking plate and connected to the sliding portion, and the second sliding pin is inserted through the second elongated hole and the shaft portion and connected to the locking plate, thereby supporting the handle catch so as to be slidable in the direction of movement of the knob portion relative to the locking plate, and supporting the lock plate so as to be rotatable around the shaft portion, In the OFF position of the knob, the second locking hole of the slide and the first locking hole of the locking plate are in communication, allowing the shackle or hasp of a padlock to be attached, and in the ON position of the knob, the second locking hole is closed by the locking plate, A handle locking device for a circuit breaker, characterized in that when the knob is moved from the OFF position to the ON position, the lock plate rotates around the shaft by the first sliding pin, and a part of the first locking hole is closed by the lock plate.

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