Load interrupter switch having rebound prevention function

Abstract

The present invention has been devised to solve the above-described problems, with the objective of the present invention being to provide a load interrupter switch having a function for preventing reconnection due to rebound that may occur during interruption. The load interrupter switch according to one aspect of the present invention is provided with a shaft lever and a rebound prevention latch assembly, thus preventing rebound from occurring after interruption.

Description

Load breaker with rebound prevention function

[0001] The present invention relates to a load-blocking switch having a rebound prevention function, and more specifically, to a load-blocking switch having a function to prevent a rebound phenomenon that may occur after a blocking operation.

[0002] Generally, electricity generated at power plants at a voltage of approximately 20,000V is stepped up to ultra-high voltage suitable for transmission and sent to primary substations. At primary substations, the supplied power is reduced to 22.9kV and distributed to secondary substations or individual consumers. The power supplied from primary substations is delivered to the receiving facilities of each consumer through a distribution system consisting of overhead and underground distribution lines, and is further supplied to low-voltage consumers through extra-high voltage consumers, high-voltage consumers, and various outdoor-installed transformers. At this stage, Load Interrupter Switches (LIS: Load Interrupter Switch or LBS: Load Break Switch) are used for the purposes of line separation, branching, and protection of the primary side of transformers in the high-voltage consumer's distribution panel (receiving facility).

[0003] In other words, load switches are devices used in cities and residential complexes to distribute power. They are used to isolate faulty sections for safety by rapidly switching the circuit breaker after a surge or accident occurs in the power system, and to shorten power outage times by supplying power to the affected section from other healthy systems. Load switches are broadly classified into solid-insulated load switches and gas-insulated load switches.

[0004] In the past, gas-insulated load switches that used gases such as SF6 for insulation and arc extinguishing were widely used, but recently, solid-insulated load switches utilizing epoxy and the like are being widely used due to trends such as preventing global warming.

[0005] In particular, the epoxy-molded insulated load switch is a device used to isolate faulty sections via remote or manual operation in the event of a power outage in a power system, and to shorten the outage duration by supplying power to the affected section from other healthy systems. It is a load switch applied to distribution automation systems that monitor load switching and line status remotely using terminal devices. It is environmentally friendly as it adopts a composite arc extinguishing method using a vacuum interrupter and air insulation, eliminating the need for SF6 gas.

[0006] Meanwhile, the air-insulated load switch is a device with load switching and short-circuit protection (when equipped with a fuse) functions in a distribution system with a nominal voltage of 22.9kV, and is an indoor type used in substations, general cubicles and panels, substation transformer / cable protection, capacitor banks, incoming equipment on the consumer side, and high-voltage branch systems.

[0007] As such, load switches are devices used in cities and residential complexes to distribute power. They are used to isolate faulty sections for safety by rapidly switching the circuit breaker after a surge or accident occurs in the power system, and to shorten power outage times by supplying power to the affected section from other healthy systems.

[0008] Among these load switches, a load switch capable of interrupting the load current is specifically called a load interrupting switch. While a general load switch performs merely mechanical switching functions, a load interrupting switch possesses not only mechanical switching capabilities but also the ability to interrupt the load current.

[0009] Among these load-breaking switches, those used in applications with low ratings operate manually. That is, the mechanism operates in response when the user grasps the operating handle and applies physical force.

[0010] Let's examine a load-breaking switch according to the prior art.

[0011] FIGS. 1 and FIGS. 2 are internal perspective views of a load-blocking switch according to the prior art. FIGS. 1 shows the main contact in an open state, and FIGS. 2 shows the main contact in a closed state.

[0012] A load-blocking switch according to the prior art includes a frame part (10), a mechanism part (40), a main contact part (31, 32), and an arc extinguishing part (60).

[0013] The frame section (10) includes two side plates (11, 12), a front section frame (13) connected to the front section of both side plates (11, 12), and a terminal frame (14, 15) connected to the rear section of both side plates (11, 12).

[0014] In the terminal frames (14, 15), a power side terminal (21) connected to the power side (line) is connected to the first terminal frame (14), and a load side terminal (22) connected to the load side is connected to the second terminal frame (15).

[0015] The power side terminal (21) is connected to the power (line). Additionally, a fixed contactor (31) is installed on the power side terminal (21). Furthermore, the power side terminal (21) is installed on the first terminal frame (14) through an insulator (18).

[0016] The load-side terminal (22) is connected to the load. Additionally, a movable contactor (32) is installed on the load-side terminal (22). Furthermore, the load-side terminal (22) is installed on the second terminal frame (15) through an insulator (18).

[0017] The main contact portion (31, 32) includes a fixed contact (31) and a movable contact (32). The fixed contact (31) is installed at the power-side terminal (21), and the movable contact (32) is installed at the load-side terminal (22).

[0018] The mechanism (40) is provided to rotate the movable contactor (32). The mechanism (40) rotates the movable contactor (32) using manual or mechanical power.

[0019] When inserted, if the user rotates the operating handle (41) counterclockwise, the rotation shaft assembly (42) rotates counterclockwise, thereby rotating the main shaft (51) counterclockwise. As the main shaft (51) rotates, the movable contactor (32) is rotated counterclockwise through the shaft link (52) and the connecting link (53) to come into contact with the fixed contactor (31). At this time, elastic force is stored in the spring assembly (45) and provides contact pressure to the main shaft (51) and the main contact parts (31, 32).

[0020] When opened, if the user rotates the operating handle (41) clockwise, the rotation axis assembly (42) rotates clockwise, thereby rotating the main shaft (51) clockwise. As the main shaft (51) rotates, the movable contactor (32) rotates clockwise through the shaft link (52) and the connecting link (53), thereby separating it from the fixed contactor (31).

[0021] An arc extinguishing section (60) is provided adjacent to the power side terminal (21).

[0022] The arc extinguishing unit (60) includes an arc chamber (65), an arc fixed contact (61) provided inside the arc chamber (65), and an arc movable contact (62) rotatably coupled to a movable contact (32). The arc extinguishing unit is a mechanism for extinguishing an arc by inducing the load current flowing through the main contact portion when open to the arc extinguishing unit.

[0023] Figure 3 shows the operating state of contacts and arc contacts in a load-breaking switch according to the prior art. It shows the initial process of transitioning from a closed state to an open state.

[0024] As the movable contact (32) rotates clockwise, the arc movable contact (62) subsequently rotates along with the movable contact (32). The arc movable contact (62) passes after temporarily contacting the arc fixed contact (61).

[0025] The opening or closing operation of the load switch is reached from the closing state of FIG. 2 through the process of FIG. 3 to the opening state of FIG. 1. In the initial closing operation, when the user pulls the operating handle (41) to rotate the rotation shaft assembly (42), elastic force is stored in the spring assembly (45), and in the later closing operation, as the spring assembly (45) passes the dead point, the rotation shaft assembly (42) is strongly rotated by the extension due to the elastic restoring force, reaching the opening state.

[0026] However, if the elastic restoring force of the spring assembly (45) is strong, there is a possibility that the main shaft (51) may be re-inserted due to a rebound phenomenon caused by recoil. A structure is required to prevent re-insertion caused by such a rebound phenomenon.

[0027] The present invention has been devised to solve the aforementioned problems, and its purpose is to provide a load interruption switch having a function to prevent re-insertion caused by a rebound phenomenon that may occur during interruption.

[0028] A load-blocking switch having a rebound prevention function according to one embodiment of the present invention comprises: a main shaft that rotates a movable contact to contact or separate it from a fixed contact; an operating handle provided on one side of the main shaft to provide power; a shaft lever fixed to the main shaft and rotating together with it; and a rebound prevention latch assembly rotatably installed on one side of the operating handle to prevent rotation of the shaft lever in the insertion direction when the switch is cut off.

[0029] Here, a rotating side plate coupled to the main shaft and rotated by the operating handle has a rotating part formed protruding from it that contacts or separates from the rebound prevention latch assembly.

[0030] In addition, an operating hole is formed in one side plate of the frame portion where the main shaft is installed, into which the rotating operating part can be inserted and rotated.

[0031] Additionally, the rebound release latch assembly comprises: a latch rotation axis fixed to one side plate of the frame portion; a release latch rotatably coupled to the latch rotation axis and to which the rotational acting portion contacts or separates; and a restraint latch rotatably coupled to the latch rotation axis and to which the shaft lever contacts or separates.

[0032] Additionally, it further includes a connecting pin that is inserted through the release latch and the restraint latch.

[0033] Additionally, it further includes a latch return spring installed on the latch rotation axis, with one end supported by the connecting pin, to provide rotational force to the release latch and the restraint latch.

[0034] In addition, the release latch has an entry portion formed on the surface facing the main shaft with an inclination at a predetermined angle.

[0035] In addition, the release latch is provided with a contact portion at the lower part of the entry portion having a steeper slope than the slope of the entry portion.

[0036] In addition, the above restraining latch is provided with a restraining portion on its upper surface where the shaft lever can be placed.

[0037] In addition, the above restraint latch is provided with a lever contact portion that is inclined on the surface facing the main shaft.

[0038] In addition, a stopper that restricts forward movement is provided on the front part of the above-mentioned restraint latch.

[0039] According to a load-blocking switch in one aspect of the present invention, a shaft lever and a rebound-prevention latch assembly are provided to prevent a rebound phenomenon occurring after blocking.

[0040] Once opening is complete, the shaft lever is constrained by the restraining latch of the anti-rebound latch assembly, thereby restricting rotation in the insertion direction; thus, even if rebound occurs on the main shaft due to the repulsive force resulting from the extension of the main spring assembly, re-insertion is prevented.

[0041] When the insertion action is performed, the rebound prevention latch assembly is disengaged from the shaft lever by the rotating part provided on the rotating side plate, thereby preventing interference.

[0042] According to a load-blocking switch in another aspect of the present invention, a counter assembly is provided to count the number of closing operations. Accordingly, it is possible to manage the history and durability of the device.

[0043] The counter assembly is provided with a lower lever that contacts or separates from the shaft lever of the main shaft, so it is separated in sections other than the counting operation, thereby preventing the transmission of impact from the main shaft.

[0044] The counter assembly is equipped with a lower link that contacts and separates from the rotating action part provided on the rotating side plate, thereby avoiding contact with the shaft lever during the blocking operation section.

[0045] FIGS. 1 and FIGS. 2 are internal perspective views of a load-blocking switch according to the prior art. FIGS. 1 shows the main contact in an open state, and FIGS. 2 shows the main contact in a closed state.

[0046] Figure 3 shows the operating state of an arc contact in a load switch according to the prior art. It shows the process of switching from a closed state to an open state.

[0047] FIGS. 4 to 7 are perspective views of a load-blocking switch according to an embodiment of the present invention. Here, FIGS. 5 to 7 show a state where the diaphragm is removed. FIGS. 5 to 7 show operating states. FIG. 5 shows an open state, FIG. 6 shows an intermediate closing state (a state that has reached the dead point), and FIG. 7 shows a closing state.

[0048] FIG. 8 is an exploded perspective view of a rotating plate assembly of a mechanism of a load-blocking switch according to one embodiment of the present invention.

[0049] FIGS. 9 and FIGS. 10 show the mechanism of a load-blocking switch according to an embodiment of the present invention. FIG. 9 shows an open state, and FIG. 10 shows a closed state.

[0050] FIG. 11 is a perspective view of a rebound prevention latch assembly applied to a load-blocking switch according to one embodiment of the present invention.

[0051] FIGS. 12 and FIGS. 13 are a perspective view and an exploded perspective view of a counter assembly applied to a load-blocking switch according to one embodiment of the present invention.

[0052] FIGS. 14 to 25 are operation diagrams of a load-blocking switch according to an embodiment of the present invention. FIGS. 15 to 20 show the closing operation process, and FIGS. 21 to 25 show the opening operation process.

[0053] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, this description is intended to be detailed enough for a person skilled in the art to easily practice the invention, and it does not imply that the technical scope and concept of the present invention are limited by these drawings.

[0054] The terms "part" or "part" used to refer to components in this invention are not used for any limiting purpose and may be omitted.

[0055] FIGS. 4 to 7 are perspective views of a load-blocking switch according to an embodiment of the present invention. Here, FIGS. 5 to 7 show a state where the diaphragm is removed. FIGS. 5 to 7 show operating states. FIG. 5 shows an open state, FIG. 6 shows an intermediate closing state (a state reaching the dead point), and FIG. 7 shows a closing state. FIG. 8 is an exploded perspective view of a rotary plate assembly of the mechanism of a load-blocking switch according to an embodiment of the present invention. FIGS. 9 and 10 show the mechanism of a load-blocking switch according to an embodiment of the present invention. FIG. 9 shows an open state, and FIG. 10 shows a closing state. A load-blocking switch according to each embodiment of the present invention will be described in detail with reference to the drawings.

[0056] A load-blocking switch having a rebound prevention function according to one embodiment of the present invention comprises: a main shaft (510) that rotates a movable contactor (320) to contact or separate it from a fixed contactor (310); an operating handle (410) provided on one side of the main shaft (510) to provide power; a shaft lever (540) fixed to the main shaft (510) and rotating together with it; and a rebound prevention latch assembly (550) rotatably installed on one side of the operating handle (410) to prevent rotation of the shaft lever (540) in the insertion direction when blocked.

[0057] First, we will examine the basic configuration of a load-blocking switch according to one embodiment of the present invention.

[0058] A load-blocking switch according to one embodiment of the present invention includes a frame part (100), a terminal part (210, 220), a main contact part (310, 320), a mechanism part (400), and an arc extinguishing part (600).

[0059] First, the frame part (100) is described. In the drawing, the cover covering the frame part (100) is omitted from the illustration.

[0060] The frame section (100) includes two side plates (110, 120), a front section frame (130) connected to the front section of both side plates (110, 120), a terminal frame (140, 150) connected to the rear section of both side plates (110, 120), a plurality of partition plates (160) covering the side sections of each plate, and an upper bar (170) and a lower bar (175) connecting the plurality of partition plates (160).

[0061] The two side plates (110, 120), the front frame (130) connected to the front end of the two side plates (110, 120), and the terminal frame (140, 150) connected to the rear end of the two side plates (110, 120) form a rectangular box-shaped frame.

[0062] On both side plates (110, 120), a cover bracket (115) is provided to cover a part of the mechanism (400).

[0063] The terminal frame (140, 150) consists of a first terminal frame (140) positioned at the top and a second terminal frame (150) positioned at the bottom.

[0064] A power side terminal (210) connected to the power side (line) is coupled to the first terminal frame (140).

[0065] A load-side terminal (220) connected to the load side is coupled to the second terminal frame (150).

[0066] The frame part (100) must be made of a material having sufficient strength so that each component can be firmly installed and operate stably, and must have an appropriate space.

[0067] Next, the terminal section (200) is described.

[0068] The terminal section (200) includes a power-side terminal (210), a load-side terminal (220), and an insulator (230).

[0069] The power side terminal (210) is connected to the power (line). The power side terminal (210) is formed in the shape of a busbar. That is, the power side terminal (210) is formed from a thick copper or aluminum plate.

[0070] A fixed contact (310) is installed at the power side terminal (210) and electrically connected.

[0071] The power side terminal (210) is installed on the first terminal frame (140) through an insulator (230). Here, the insulator (230) is provided for insulation between the power side terminal (210) and the first terminal frame (140).

[0072] The load-side terminal (220) is connected to the load. The load-side terminal (220) is formed in the shape of a busbar. That is, the load-side terminal (220) is formed from a thick copper or aluminum plate.

[0073] A movable contact is installed at the load-side terminal (220) and is electrically connected.

[0074] The load-side terminal (220) is installed on the second terminal frame (150) through an insulator (230). Here, the insulator (230) is provided for insulation between the load-side terminal (220) and the second terminal frame (150).

[0075] Next, the main contact portion (310, 320) is described. The main contact portion (310, 320) includes a fixed contact (310) and a movable contact (320).

[0076] The fixed contact (310) is fixedly installed on the power side terminal (210). The fixed contact (310) is made of a material with high electrical conductivity. The fixed contact (310) is provided with a fixed contact (312). The fixed contact (312) is formed in a 'U' shape and has a groove. A movable contact (322) can be inserted into the fixed contact (312) to make contact.

[0077] A movable contactor (320) is installed on a load-side terminal (220). A terminal connection portion is provided on the load-side terminal (220) in a direction orthogonal to the load-side terminal (220), so that the movable contactor (320) is rotatably installed. The movable contactor (320) may be composed of a pair of plates arranged in parallel. Accordingly, a pair of movable contactor (320) plates may be placed on each side of the terminal connection portion (225). The movable contactor (320) is axially coupled to the terminal connection portion and rotates according to the action of the mechanism portion (400).

[0078] The movable contact (320) is made of a material with high electrical conductivity. The movable contact (320) is provided with a movable contact (322). The movable contact (322) may be composed of an axis provided between a pair of movable contact (320) plates. When the movable contact (320) rotates toward the fixed contact (310), the movable contact (322) is inserted into the fixed contact (312) and electrically connected.

[0079] Explain the mechanism part (400).

[0080] The mechanism (400) is provided to rotate the movable contactor (320).

[0081] The mechanism (400) rotates the movable contactor (320) using manual or automatic power. In this embodiment, an example of operating the mechanism (400) manually by human power is described.

[0082] The mechanism (400) includes an operating handle (410), a rotating plate assembly (420), and a main spring assembly (450). The mechanism (400) is shown in detail in FIGS. 5 through 8. FIGS. 6 and 7 show the rotating plate assembly (420) with the outer rotating side plate (421) removed. FIG. 8 is an exploded view of the rotating plate assembly.

[0083] The operating handle (410) is grasped by the user to provide rotational force. The user can grasp the operating handle (410) and rotate it clockwise or counterclockwise around the main shaft (510).

[0084] The rotary plate assembly (420) comprises a pair of rotary side plates (421, 426) arranged at a predetermined interval, a main spring connecting plate (430) positioned between the pair of rotary side plates (421, 426) and connected to the main spring assembly (450), a main shaft connecting plate (440) partially engaged with the main spring connecting plate (430) and connected to the main shaft (510), and a rotary plate lever (415) connecting the rotary side plates (421, 426) and the operating handle (410).

[0085] A pair of rotating side plates (421, 426) are provided with lever connecting portions (422, 427) to which a rotating plate lever (415) is coupled. The rotating plate lever (415) is coupled between the lever connecting portions (422, 427). The lever connecting portions (422, 427) are formed to protrude radially on one side of the pair of rotating side plates (421, 426).

[0086] A pair of rotating side plates (421, 426) are provided with a pressure member (423, 424) that provides rotational force to the main spring connecting plate (430). The pressure member (423, 424) consists of a first pressure member (423) that provides elastic force to the main spring connecting plate (430) when inserted, and a second pressure member (424) that provides elastic force to the main spring connecting plate (430) when opened. The pressure member (423, 424) may be composed of a pin, bolt, or shaft that crosses between the pair of rotating side plates (421, 426).

[0087] The first pressure part (423) and the second pressure part (424) are arranged adjacent to the outer surface of a pair of rotating side plates (421, 426). At this time, the first pressure part (423) and the second pressure part (424) may be arranged symmetrically with respect to the rotation center of the rotating side plates (421, 426). That is, the first pressure part (423) and the second pressure part (424) are arranged on a diameter line passing through the rotation center of the rotating side plates (421, 426). Accordingly, the first pressure part (423) and the second pressure part (424) are spaced 180 degrees apart from each other with respect to the rotation center of the rotating side plates (421, 426).

[0088] Additionally, the lever connecting part (422) can be positioned at a 90-degree interval with respect to the first pressing part (423) and the second pressing part (424), respectively. That is, the lever connecting part (422, 427) is positioned on a line that is orthogonal to the first pressing part (423) and the second pressing part (424), respectively. Accordingly, the rotating plate lever (415) is also positioned at a 90-degree interval with respect to the first pressing part (423) and the second pressing part (424), respectively.

[0089] Among the rotating side plates (421, 426), a rotating action part (428) is formed protruding from one side of the inner rotating side plate (426). The rotating action part (428) is formed protruding from the inner rotating side plate (426) on the opposite side of the surface where the first pressing part (423) and the second pressing part (424) protrude. The rotating action part (428) is positioned between the first pressing part (423) and the second pressing part (424). For example, the rotating action part (428) is positioned on a line perpendicular to the straight line connecting the first pressing part (423) and the second pressing part (424).

[0090] The main spring connecting plate (430) is provided for the interaction between the rotating side plates (421, 426) and the main spring assembly (450). The main spring connecting plate (430) moves by receiving the rotational force of the rotating side plates (421, 426) and provides elastic force to the main spring (451).

[0091] A main spring connecting portion (431) is formed protrudingly on the main spring connecting plate (430). A main spring rod (453) is axially connected to the main spring connecting portion (431), so that the main spring assembly (450) and the main spring connecting plate (430) interact.

[0092] The main spring connecting plate (430) is cam-shaped. The main spring connecting plate (430) has a pressure groove (432, 433) formed therein that engages temporarily with the pressure portion (423, 424). The pressure groove (432, 433) consists of a first pressure groove (432) that engages with the first pressure portion (423) and a second pressure groove (433) that engages with the second pressure portion (424).

[0093] When the operating handle (410) is inserted, the first pressure part (423) engages with the first pressure part groove (432), and the rotating side plate (421, 426) and the main spring connecting plate (430) rotate together in the insertion direction (counterclockwise in FIG. 5, 6, 7).

[0094] When the operating handle (410) is opened, the second pressure part (424) engages with the second pressure part groove (433), and the rotating side plate (421, 426) and the main spring connecting plate (430) rotate together in the opening direction (clockwise in FIG. 5, 6, and 7).

[0095] A locking part (434, 435) that rotates the main shaft connecting plate (440) is formed protrudingly on the main spring connecting plate (430). The locking part (434, 435) consists of a first locking part (434) that engages with the main shaft connecting plate (440) to rotate the main shaft connecting plate (440) during an insertion operation, and a second locking part (435) that engages with the main shaft connecting plate (440) to rotate the main shaft connecting plate (440) during an opening operation. The first locking part (434) may be formed adjacent to the second pressure part groove (433), and the second locking part (435) may be formed adjacent to the first pressure part groove (432).

[0096] The main spring assembly (450) and the main spring connecting plate (430) interact. When the positions of the main spring assembly (450) and the main spring connecting plate (430) are prior to the dead point (position between FIG. 5 and FIG. 6 during the insertion action, and position between FIG. 6 and FIG. 7 during the opening action), the main spring connecting plate (430) rotates to push the main spring rod (453) and compress the main spring (451). When the positions of the main spring assembly (450) and the main spring connecting plate (430) are past the dead point (position between FIG. 6 and FIG. 7 during the insertion action, and position between FIG. 5 and FIG. 6 during the opening action), the compressed main spring (451) is restored, and the main spring rod (453) rotates the main spring connecting plate (430). Here, the dead point can be said to be the point where the longitudinal extension line of the main spring rod (453) intersects the axis line of the main shaft (510).

[0097] As shown in FIG. 6, when the positions of the main spring assembly (450) and the main spring connecting plate (430) are at a dead point, either the locking part (434, 435) of the main spring connecting plate (430) or the locking groove (444, 445) of the main shaft connecting plate (440) comes into contact with each other. Meanwhile, when the positions of the main spring assembly (450) and the main spring connecting plate (430) are at a dead point during the closing action of the operating handle (410), the first locking part (434) and the first locking groove (444) come into contact, and when the positions of the main spring assembly (450) and the main spring connecting plate (430) are at a dead point during the opening action of the operating handle (410), the second locking part (435) and the second locking groove (445) come into contact.

[0098] An intermediary plate (429) may be provided to maintain the gap between the outer rotating plate (421) and the main spring connecting plate (430) and to facilitate the slip action.

[0099] The main shaft connecting plate (440) rotates the main shaft (510) by receiving the force from the main spring connecting plate (430). The main shaft connecting plate (440) is arranged in parallel to the main spring connecting plate (430). The main shaft connecting plate (440) and the main spring connecting plate (430) are arranged so that a portion of their cam surfaces come into contact with each other. The catch portions (434, 435) of the main spring connecting plate (430) protrude along the axial direction and come into contact with the cam surface of the main shaft connecting plate (440).

[0100] The main shaft connecting plate (440) is coupled to the main shaft (510) and rotates as a single unit. At this time, the main shaft connecting plate (440) and the main shaft (510) can be fixed by a pin connection. A pin groove (446) for this pin connection is provided in the central hole portion of the main shaft connecting plate (440) and is connected by an axle pin (447).

[0101] A locking groove (444, 445) is cam-formed on the circumferential surface of the main shaft connecting plate (440) and temporarily contacts the locking portion (434, 435) of the main spring connecting plate (430) to receive force. When the position of the main spring assembly (450) and the main spring connecting plate (430) exceeds the dead point during the closing action of the operating handle (410), the first locking portion (434) and the first locking groove (444) come into contact, and when the position of the main spring assembly (450) and the main spring connecting plate (430) exceeds the dead point during the opening action of the operating handle (410), the second locking portion (435) and the second locking groove (445) come into contact.

[0102] That is, when the position of the main spring assembly (450) and the main spring connecting plate (430) exceeds the dead point during the insertion action of the operating handle (410), the first locking part (434) and the first locking groove (444) come into contact, causing the main spring connecting plate (430) and the main shaft connecting plate (440) to move together in a counterclockwise direction (insertion direction). When the position of the main spring assembly (450) and the main spring connecting plate (430) exceeds the dead point during the opening action of the operating handle (410), the second locking part (435) and the second locking groove (445) come into contact, causing the main spring connecting plate (430) and the main shaft connecting plate (440) to move together in a clockwise direction (opening direction). At this time, since the main shaft (510) is integrally coupled to the main shaft connecting plate (440), it moves together with the main shaft connecting plate (440).

[0103] Based on the axis line of the main shaft (510) (axis indicator line in FIG. 8), the gap between the first locking part (434) and the second locking part (435) is formed at an acute angle, and the gap between the first locking groove (444) and the second locking groove (445) is formed at an obtuse angle. Accordingly, when the first locking part (434) of the main spring connecting plate (430) and the first locking groove (444) of the main shaft connecting plate (440) are in contact during the insertion operation, the second locking part (435) and the second locking groove (445) are separated from each other, and when the second locking part (435) of the main spring connecting plate (430) and the second locking groove (445) of the main shaft connecting plate (440) are in contact during the opening operation, the first locking part (434) and the first locking groove (444) are separated from each other.

[0104] The operation of the rotating plate assembly (420) based on the dead point of the main spring assembly (450) and the main spring connecting plate (430) is summarized as follows.

[0105] Before the dead point, the rotating side plate (421, 426) and the main spring connecting plate (430) move together via the pressurizing part (423, 424) by the manual rotational force of the operating handle (410), and after the dead point, the main spring connecting plate (430) and the main shaft connecting plate (440) move together via the engagement of the locking part (434, 435) and the locking groove (444, 445) by the restoring force of the main spring (451). Here, the main shaft (510) moves integrally with the main shaft connecting plate (440).

[0106] The main spring assembly (450) provides rotational force to the main shaft (510).

[0107] The main spring assembly (450) includes a main spring (451), a main spring rod (453), and a main spring bracket (455).

[0108] The main spring (451) is provided between the main spring rod (453) and the main spring bracket (455) and stores elastic force while being compressed when the operating handle (410) is rotated, and rotates the main shaft connecting plate (440) by restoring it when the main spring rod (453) passes the dead point.

[0109] An auxiliary spring assembly (not shown) is provided on the opposite side plate (120) of the side plate (110) on which the main spring assembly (450) is installed. The auxiliary spring assembly serves to assist the main spring assembly (450).

[0110] The main shaft (510) is provided for the closing and opening action of the main contact. Specifically, the main shaft (510) provides power to rotate the movable contact (320).

[0111] The main shaft (510) is provided across the two side plates (110, 120). The main shaft (510) is coupled to the main shaft connecting plate (440) of the rotating plate assembly (420) and rotates according to the power of the operating handle (410).

[0112] The main shaft (510) is connected to the movable contactor (320) via the shaft link (520) and the connecting link (530). The movable contactor (320) rotates according to the rotation of the main shaft (510).

[0113] Explain the arc Soho section (600).

[0114] The arc extinguishing unit (600) is provided to electrically cut off the load current. That is, although the power source and the load are mechanically disconnected due to the separation of the main contacts (310, 320), the residual current is guided to the arc extinguishing unit to completely cut off the current remaining in the circuit electrically.

[0115] The arc extinguishing unit (600) includes an arc chamber (610) installed adjacent to the power side terminal (210), an arc fixed contact (630) fixed inside the arc chamber (610), and an arc movable contact (640) installed on a movable contact (320).

[0116] An arc chamber bracket (601) is provided. The arc chamber bracket (601) is installed adjacent to the power-side terminal frame (140). The arc chamber bracket (601) may be installed on the power-side terminal (210). The arc chamber bracket (601) may be installed behind the fixed contactor (310).

[0117] The arc chamber bracket (601) is formed by bending it into an L-shape. One side of the arc chamber bracket (601) is installed on the power supply terminal (210), and the arc chamber (610) is installed on the other side. The arc chamber (610) is fixed to the arc chamber bracket (601) by a fastening member (602).

[0118] The arc chamber (610) is provided as a symmetrical pair. That is, the arc chamber (610) consists of an arc chamber first body and an arc chamber second body that are symmetrically formed with respect to each other.

[0119] The arc chamber (610) is formed from a gas generating member. The arc chamber (610) extinguishes the arc generated at the arc contact portions (632, 642). The inner surface of the arc chamber (610) may be formed from a material that vaporizes due to high heat.

[0120] An arc fixed contact (630) is placed inside the arc chamber (610). The arc fixed contact (630) is fixed to the arc chamber bracket (601) by a fastening member.

[0121] The arc fixed contact (630) is composed of a symmetrical pair. That is, the arc fixed contact (630) is composed of an arc fixed contact first body and an arc fixed contact second body that are symmetrically formed with respect to each other. The arc fixed contact (630) has an arc fixed contact (632). The arc fixed contact (632) is formed of a component that is highly conductive and resistant to heat, such as a nickel-chromium (Ni-Cr) alloy or a tungsten-copper (W-Cu) alloy.

[0122] The arc movable contact (640) is rotatably installed on the movable contact (320). The arc movable contact (640) is coupled to the movable contact (320) by a movable shaft (670). The movable shaft (670) can be shared with the connecting link (530). That is, the movable shaft (670) simultaneously serves as a rotational shaft connecting the connecting link (530) and the movable contact (320), and as a rotational shaft connecting the movable contact (320) and the arc movable contact (640).

[0123] The arc movable contactor (640) has its main body positioned at a predetermined distance from the movable contactor (320). To this end, the lower portion (641) of the arc movable contactor (640) is formed by bending it into a 'U' shape.

[0124] A return spring (660) is provided to provide a restoring force to the arc movable contactor (640). The return spring (660) is installed in the 'U'-shaped bend at the bottom of the arc movable contactor (640). The return spring (660) may be composed of a torsion spring. One end of the return spring (660) is supported at the bottom of the arc movable contactor (640), and the other end of the return spring (660) is supported by a rotation limiting plate (650).

[0125] An arc movable contact (642) is provided on one side of the upper portion of the arc movable contact (640). The arc movable contact (642) is formed of an alloy with good electrical conductivity.

[0126] A rotation limiting plate (650) is provided. The rotation limiting plate (650) is provided to limit the rotation of the arc movable contactor (640) to within a predetermined range.

[0127] Further reference will be made to FIGS. 9 and FIGS. 11. FIGS. 9 and FIGS. 10 show perspective views taken from different angles than FIGS. 5 to 7. FIG. 9 shows an open state, and FIG. 10 shows a closed state. FIG. 11 is a perspective view of a rebound prevention latch assembly applied to a load-blocking switch according to an embodiment of the present invention.

[0128] A rebound prevention mechanism is described to prevent the main shaft from being re-inserted due to an impact occurring during blockage. The rebound prevention mechanism includes a rotating part (428) provided on an inner rotating side plate (426), a shaft lever (540) provided on a main shaft (510), and a rebound prevention latch assembly (550) installed on one side plate (110) of a frame part (100).

[0129] Among the rotating side plates (421, 426), a rotating action part (428) is formed protruding from one side of the inner rotating side plate (426). The rotating action part (428) is formed protruding from the inner rotating side plate (426) on the opposite side of the surface where the first pressing part (423) and the second pressing part (424) protrude. The rotating action part (428) is positioned between the first pressing part (423) and the second pressing part (424). For example, the rotating action part (428) is positioned on a line perpendicular to the straight line connecting the first pressing part (423) and the second pressing part (424). The inner rotating side plate (426) is formed in a ring shape, and the first pressing part (423), the second pressing part (424), and the rotating action part (428) can be positioned at equal distances from the center point of the inner rotating side plate (426).

[0130] The rotational action part (428) moves according to the movement of the inner rotational side plate (426). When the rotational action part (428) comes into contact with the rebound prevention latch assembly (550), it pushes the rebound prevention latch assembly (550).

[0131] In one side plate (110) of the frame part (100), an action hole (112) is formed so that a rotating action part (428) can be inserted and rotated. The action hole (112) is formed in an arc shape. The action hole (112) is formed adjacent to the inner rotating side plate (426). The action hole (112) is formed as an arc having a predetermined distance centered on the main shaft (510). Here, the predetermined distance may correspond to the distance from the main shaft (510) to the rotating action part (428).

[0132] A shaft lever (540) is provided on the main shaft (510). The shaft lever (540) is positioned approximately perpendicular to the shaft link (520). The shaft lever (540) is fixedly installed on the main shaft (510) and moves together with the main shaft (510).

[0133] The shaft lever (540) moves in contact with the restraining latch (570) of the rebound prevention latch assembly (550).

[0134] In the open state, the shaft lever (540) rests on the restraining latch (570). When the restraining latch (570) disengages from the shaft lever (540), the shaft lever (540) can rotate in the insertion direction together with the main shaft (510) (switch from FIG. 9 to FIG. 10).

[0135] When the main shaft (510) moves in the open direction, the shaft lever (540) moves while pushing the restraint latch (570) (switch from FIG. 10 to FIG. 9).

[0136] Meanwhile, when the shaft lever (540) is constrained by the rebound prevention latch assembly (550), rotation in the insertion direction is prevented, thereby constraining the insertion direction rotation of the main shaft (510).

[0137] A rebound prevention latch assembly (550) is provided. The rebound prevention latch assembly (550) is installed between one side plate (110) of the frame part (100) and the latch bracket (114).

[0138] A latch bracket (114) is attached to one side plate (110) of the frame portion (100). The latch bracket (114) is installed on the inner side of one side plate (110) of the frame portion (100) and adjacent to the main shaft (510). The latch bracket (114) is positioned on the inner side of the one side plate (110), and the rotating plate assembly (420) is positioned on the outer side of the one side plate (110).

[0139] A rebound retention latch assembly (550) is rotatably installed between the latch bracket (114) and the side plate (110).

[0140] Referring to FIG. 11, the rebound release latch assembly (550) includes a latch rotation axis (551), an axis bushing (553), a latch return spring (555), a connecting pin (557), a release latch (560), and a restraint latch (570).

[0141] A latch rotation axis (551) is installed across one side plate (110) of the frame part (100) and the latch bracket (114). The release latch (560) and the restraint latch (570) of the rebound release latch assembly (550) are rotatably installed on the latch rotation axis (551). The latch rotation axis (551) is installed parallel to the main shaft (510) at a predetermined distance.

[0142] An axle bushing (553) is provided on the latch rotation axis (551). The axle bushing (553) surrounds the latch rotation axis (551). The axle bushing (553) is provided between the latch rotation axis (551) and the release latch (560) and the restraint latch (570). The axle bushing (553) is formed in the shape of a tube. The axle bushing (553) protects the latch rotation axis (551) and reduces friction when the release latch (560) and the restraint latch (570) rotate, thereby causing slip to occur.

[0143] A latch return spring (555) is provided on the latch rotation axis (551). The latch return spring (555) returns the release latch (560) and the restraint latch (570) to their original positions. One end (lower end) of the latch return spring (555) is supported by the latch bracket (114), and the other end (upper end) is supported by the connecting pin (557). Since the lower end of the latch return spring (555) is fixed to the latch bracket (114) and does not move, the connecting pin (557) attached to the upper end of the latch return spring (555) moves by receiving the force of the latch return spring (555). Accordingly, the release latch (560) and the restraint latch (570) move.

[0144] A connecting pin (557) is provided. The connecting pin (557) connects the release latch (560) and the restraining latch (570) so that they move together. The connecting pin (557) is inserted into the pin hole (566) of the release latch (560) and the pin hole (577) of the restraining latch (570) to allow the release latch (560) and the restraining latch (570) to move as a single unit.

[0145] A release latch (560) is provided. The release latch (560) moves in contact with the rotating part (428).

[0146] The release latch (560) may be composed of a flat plate. The release latch (560) is positioned adjacent to one side plate (110) of the frame portion (100). The release latch (560) is placed in a state where it is moved forward by the force of the latch return spring (555). At this time, the release latch (560) covers a part of the action hole (112).

[0147] In the release latch (560), an axial hole (568) is formed in the lower part, into which a latch rotation shaft (551) and an axial bushing (553) are inserted and installed.

[0148] A pinhole (566) is formed in the middle of the release latch (560) so that a connecting pin (557) is inserted and installed.

[0149] The release latch (560) is provided with an entry portion (562) and a contact portion (564) on one side facing the main shaft (510). Here, the entry portion (562) is formed as a gentle slope, and the contact portion (564) is formed as a steep slope. The slope of the contact portion (564) is formed to be greater than the slope of the entry portion (562).

[0150] The entry portion (562) is formed with a gentle slope to facilitate the entry of the rotational action portion (428). When the rotational action portion (428) comes into contact with the entry portion (562) of the release latch (560), the release latch (560) is pushed backward while rotating clockwise around the latch rotation axis (551) by the force of the rotational action portion (428).

[0151] As the rotating action part (428) passes the contact part (564), the release latch (560) is pushed backward as far as possible. The contact part (564) is formed as an arc-shaped groove.

[0152] A restraining latch (570) is provided.

[0153] The restraining latch (570) moves together with the release latch (560) and contacts the shaft lever (540).

[0154] The restraining latch (570) may be composed of a flat plate. The restraining latch (570) is positioned side by side with the release latch (560) at a predetermined interval.

[0155] A shaft hole is formed in the lower part of the restraint latch (570) so that a latch rotation shaft (551) and a shaft bushing (553) are inserted and installed.

[0156] A pinhole (577) is formed in the middle of the restraint latch (570) so that a connecting pin (557) is inserted and installed.

[0157] A restraining latch (570) is provided with a restraining portion (575) on its upper surface and a lever contact portion (573) on one side facing the main shaft (510). Here, the restraining portion (575) is formed as a flat portion, and the lever contact portion (573) is formed as a steeply inclined portion. The lever contact portion (573) is formed as an arc-shaped groove.

[0158] When the shaft lever (540) is placed on the restraining part (575), the downward movement of the shaft lever (540) is restricted, and accordingly, the clockwise rotation of the main shaft (510) is restricted.

[0159] A stopper (571) is provided in the restraint latch (570). The stopper (571) is provided on the front of the restraint latch (570) so that when the restraint latch (570) moves forward, it contacts the latch bracket (114) to stop the movement of the restraint latch (570).

[0160] A latch return spring (555) is installed on a latch rotation axis (551) or an axis bushing (553). The latch return spring (555) may be composed of a torsion spring. The latch return spring (555) provides rotational force to the release latch (560) and the restraint latch (570). One end (lower end) of the latch return spring (555) is supported by the latch bracket (114), and the other end (upper end) of the latch return spring (555) is supported by the connecting pin (557). Since the lower end of the latch return spring (555) is fixed to the latch bracket (114) and does not move, the connecting pin (557) attached to the upper end of the latch return spring (555) moves by receiving the force of the latch return spring (555). Accordingly, the release latch (560) and the restraint latch (570) move forward by receiving a counterclockwise force around the latch rotation axis (551).

[0161] The operation of the shaft lever (540) is as follows.

[0162] When the restraining latch (570) is in a state where it has moved forward by the latch return spring (555), the shaft lever (540) is placed in a state where it is caught on the restraining part (575) of the restraining latch (570), so it cannot rotate clockwise (in the insertion direction) around the latch rotation axis (551).

[0163] When the restraining latch (570) is in a rearward position, the shaft lever (540) is disengaged from the restraining portion (575) of the restraining latch (570), so it can rotate clockwise (in the insertion direction) around the latch rotation axis (551).

[0164] When the shaft lever (540) rotates in a counterclockwise direction (open direction), the shaft lever (540) moves by contacting the lever contact portion (573) of the restraint latch (570) and pushing the restraint latch (570) backward, so the shaft lever (540) can rotate in a counterclockwise direction around the latch rotation axis (551).

[0165] The operation of the rebound prevention latch assembly (550) will be explained.

[0166] First, refer to the open state of FIG. 9. The rebound prevention latch assembly (550) is in a state where it has moved forward by the force of the latch return spring (555). The shaft lever (540) is in a state where it rests on the restraining part (575) of the restraining latch (570).

[0167] Next, refer to the insertion state of FIG. 10. When the rotating plate assembly (420) rotates clockwise (in the insertion direction), the rotating action part (428) pushes the entry part (562) of the release latch (560), and the rebound prevention latch assembly (550) is pushed backward. When the rotating action part (428) pushes the contact part (564) of the release latch (560), the release latch (560) is pushed completely backward, and the restraining latch (570) does not restrain the shaft lever (540).

[0168] When the main spring assembly (450) generates a restoring force beyond the dead point, the rotating plate assembly (420) is fully engaged, the rotating action part (428) passes the contact part (564), and the shaft lever (540) passes the lever contact part (573) of the restraint latch (570). The rebound prevention latch assembly (550) stops when the stopper (571) contacts the latch bracket (114).

[0169] Again, refer to the open state of FIG. 9. When the rotating plate assembly (420) rotates counterclockwise, the shaft lever (540) pushes the restraining latch (570), causing the rebound prevention latch assembly (550) to be pushed backward.

[0170] The rotating plate assembly (420) is opened, and the shaft lever (540) passes through the lever contact portion (573) and rests on the restraining portion (575) of the restraining latch (570). Since the clockwise movement of the shaft lever (540) is restricted by the restraining portion (575), reverse rotation and re-insertion of the main shaft (510) due to the rebound phenomenon are prevented.

[0171] A counter assembly (700) is provided to count the closing operation of a load-blocking switch according to one embodiment of the present invention. At this time, the counter assembly (700) is provided in a structure that can avoid the transmission of impact from the main shaft (510). FIGS. 12 and FIGS. 13 show a perspective view and an exploded perspective view of a counter assembly applied to a load-blocking switch according to one embodiment of the present invention.

[0172] The counter assembly (700) includes brackets (710, 720, 730), a lower lever (760) that contacts or separates from a shaft lever (540) of a main shaft (510), a lower link (770) and an upper link (775) that are linked to the lower lever (760), and an upper lever (780) provided between the upper link (775) and the counter (740).

[0173] A plurality of brackets are provided to install the counter assembly (700). For example, three brackets may be provided. These are classified as the first bracket (710), the second bracket (720), and the third bracket (730).

[0174] A counter (740) is installed on the first bracket (710), and a lever shaft (750), an upper link (775), a lower link (770), etc. are installed on the second bracket (720).

[0175] The second bracket (720) is fixed to one side plate (110) of the frame part (100). The first bracket (710) is fixed to the upper part of the second bracket (720), and the third bracket (730) is fixed between the side of the second bracket (720) and the one side plate (110).

[0176] A lever shaft (750) is installed across the second bracket (720) and the third bracket (730). A lower lever (760) and a lower link (770) are installed on the lever shaft (750), and the lever shaft (750) functions as the rotation axis of the lower lever (760) and the lower link (770).

[0177] A lower lever (760) is provided. The lower lever (760) is rotatably installed on the lever shaft (750).

[0178] A lever shaft hole (765) is formed in the upper part of the lower lever (760) and is inserted and installed into the lever shaft (750).

[0179] A receiving portion (761) is provided at the lower end of the lower lever (760) to receive the force of the shaft lever (540) when it comes into contact with the shaft lever (540). The receiving portion (761) may be provided in a shape in which the lower end of the lower lever (760) is bent. When the receiving portion (761) is constrained by the shaft lever (540), the movement of the lower lever (760) forward is restricted.

[0180] When the lower lever (760) is constrained by the shaft lever (540) (when the shaft lever (540) pushes out the receiving portion (761) of the lower lever (760)), it rotates counterclockwise and is placed in a state where it is pushed backward, and when the lower lever (760) is released from the constraint of the shaft lever (540) (when the shaft lever (540) is removed from the receiving portion (761) of the lower lever (760)), it receives the force of the lever return spring (757) and rotates clockwise and is placed in a state where it is moved forward.

[0181] In the open state, the lower lever (760) is constrained by the shaft lever (540). However, during the insertion process, the lower lever (760) is separated from the shaft lever (540), and this state is maintained until the blocking process. Therefore, the counter assembly (700) does not receive impact from the main shaft (510) during the blocking operation.

[0182] A stopper (767) is provided on the front of the lower lever (760). When the stopper (767) contacts the front of the second bracket (720), the forward movement of the lower lever (760) stops.

[0183] A lower pin hole (763) is provided in the lower part of the lower lever (760) so that a lower pin (793) can be installed. The lower pin (793) is inserted into the lower pin hole (763) so that the lower lever (760) and the lower link (770) move as a single unit and the lever return spring (757) is supported.

[0184] A lever return spring (757) is provided to provide rotational force to the lower lever (760). The lever return spring (757) may be composed of a torsion spring. The lever return spring (757) is installed on the lever shaft (750). One end (upper end) of the lever return spring (757) is supported by the front end of the second bracket (720), and the other end (lower end) of the lever return spring (757) is supported by the lower pin (793). Since the second bracket (720) is a fixed member and the lower pin (793) is a movable member, the lever return spring (757) provides a force to move the lower pin (793) and the lower lever (760) coupled thereto. The lever return spring (757) is installed so that when viewed from the right (see operation diagrams in FIGS. 14 to 25), the lower lever (760) rotates clockwise and provides a force to move forward.

[0185] A bushing (755) or bearing is provided to surround the lever shaft (750). The bushing (755) is installed between the lever shaft (750), the lower lever (760), and the lower link (770). The bushing (755) is provided to protect the lever shaft (750) and to reduce friction during rotation of the lower lever (760) and the lower link (770).

[0186] Links are provided to transmit the movement of the lower lever (760) to the counter (740). Here, the links may consist of a lower link (770) and an upper link (775).

[0187] The lower link (770) is rotatably installed on the lever shaft (750). A lever shaft hole (772) is formed in the middle portion of the lower link (770) and inserted into the lever shaft (750).

[0188] A lower pin hole (771) is formed in the lower part of the lower link (770) so that a lower pin (793) is inserted and installed. The lower link (770) moves integrally with the lower lever (760) by means of the lower pin (793).

[0189] An intermediate pinhole (773) is formed in the upper part of the lower link (770), and an intermediate pin (790) is inserted and installed. The lower link (770) is connected to the upper link (775) by the intermediate pin (790).

[0190] The lower link (770) is formed such that the lower and upper parts form a predetermined angle with respect to the middle part. Accordingly, when the lower part of the lower link (770) moves forward, the effect occurs that the upper part of the lower link (770) moves backward and downward.

[0191] When the lower lever (760) rotates clockwise around the lever axis (750), the lower link (770) also rotates clockwise around the lever axis (750) to pull the upper link (775) downward.

[0192] The lower pin (793) connects the lower lever (760) and the lower link (770). The lower pin (793) is installed in common on the lower link (770) and the lower lever (760) so that the lower lever (760) and the lower link (770) move as a single unit.

[0193] Additionally, the lower pin (793) supports the lower part of the lever return spring (757) so that the lower lever (760) receives the force of the lever return spring (757).

[0194] The intermediate pin (790) connects the lower link (770) and the upper link (775). The upper link (775) and the lower link (770) can rotate in different directions or in the same direction around the intermediate pin (790). Additionally, the points where the intermediate pin (790) engages with the upper link (775) and the lower link (770) translate in the same way.

[0195] A link contact portion (774) is provided on the lower front portion of the lower link (770). The link contact portion is the part where the rotational action portion (428) contacts. When the rotational action portion (428) contacts the link contact portion (774), the lower link (770) is placed in a rearward position. Since the lower lever (760) also moves integrally with the lower link (770), the lower lever (760) is also placed in a rearward position.

[0196] When the rotational actuation part (428) moves away from the link contact part (774), the lower link (770) is released from the restraint of the rotational actuation part (428). However, since the lower lever (760) moves integrally with the lower link (770) at this time, movement may be restricted depending on whether the lower link (770) is capable of movement. That is, if the lower lever (760) is restrained by the shaft lever (540), the forward movement of the lower link (770) is also restricted.

[0197] An upper link (775) is provided. The lower end of the upper link (775) is rotatably connected to the lower link (770), and the upper end of the upper link (775) is rotatably connected to the upper lever (780).

[0198] An intermediate pinhole (776) is formed in the lower part of the upper link (775) so that an intermediate pin (790) is inserted and installed.

[0199] An upper pin hole (778) is formed in the upper part of the upper link (775) so that an upper pin (795) is inserted and installed. The upper link (775) is connected to the upper lever (780) by the upper pin (795).

[0200] The upper link (775) moves downward or upward by receiving the force from the lower link (770).

[0201] The upper lever (780) is formed in a 'U' shape and has two side sections (781, 782).

[0202] The upper lever (780) is rotatably installed on the first bracket (710). The upper lever (780) is installed on the first bracket (710) by means of an upper shaft (797). The upper shaft (797) is installed across both sides (781, 782) of the upper lever (780). The upper lever (780) is rotatable around the upper shaft (797).

[0203] One side portion (781) of the upper lever (780) extends backward to form a link connection portion (783), and the other side portion (782) of the upper lever (780) extends forward to form a counter action portion (785).

[0204] An axial hole is formed in the link connection part (783) of the upper lever (780) so that an upper pin (795) is inserted and installed. The upper pin (795) axially connects the upper lever (780) and the upper link (775).

[0205] Since the counter action part (785) and the link connection part (783) are positioned in opposite directions relative to the upper axis (797), the counter action part (785) and the link connection part (783) move in opposite directions relative to each other.

[0206] When the upper link (775) moves downward, the link connection part (781) provided at the rear of the upper lever (780) moves downward, so the counter action part (785) provided at the front of the upper lever (780) moves upward, and when the upper link (775) moves upward, the link connection part (781) provided at the rear of the upper lever (780) moves upward, so the counter action part (785) provided at the front of the upper lever (780) moves downward.

[0207] The upper pin (795) connects the upper lever (780) and the upper link (775). The upper link (775) and the upper lever (780) can rotate in different directions or in the same direction around the upper pin (795). Additionally, the points where the upper pin (795) engages with the upper link (775) and the upper lever (780) translate in the same direction.

[0208] The operation of the counter assembly (700) is described as follows.

[0209] Refer to the open state of FIG. 9. The lower link (770) is in a state where it is pushed backward by being restrained by the rotational actuation part (428). Additionally, the lower lever (760) is also in a state where it is pushed backward by being restrained by the shaft lever (540). The lower lever (760) is in a state where it is rotated counterclockwise around the lever axis (750), the lower link (770) is also rotated counterclockwise together with the lower lever (760), and the upper link (775) is in a state where it is raised. The upper lever (780) is rotated counterclockwise so that the counter actuation part (785) is in a state where it is lowered. The counter actuation part (785) is in a state where it is pressing the counter lever (742) of the counter (740).

[0210] Next, refer to the input state of FIG. 10. As the rotating side plate (421, 426) rotates, the rotating action part (428) moves out of the link contact part (774) of the lower link (770), and as the main shaft (510) rotates, the shaft lever (540) moves out of the lower lever (760). The lower lever (760) moves out of the restraint of the shaft lever (540) and moves forward by the force of the lever return spring (757). The lower lever (760) rotates clockwise around the lever axis (750), the lower link (770) also rotates clockwise together with the lower lever (760), and the upper link (775) descends. The upper lever (780) rotates clockwise, causing the counter action part (785) to rise. The counter operating part (785) does not restrain the counter lever (742) of the counter (740), and the counter lever (742) rises so that the number of the counter (740) increases by 1.

[0211] The operation of a load-blocking switch according to one embodiment of the present invention will be explained.

[0212] Further reference will be made to FIGS. 14 to 25. FIGS. 14 to 25 illustrate the operation process of a load-blocking switch according to an embodiment of the present invention. FIGS. 15 to 20 illustrate the closing operation process, and FIGS. 21 to 25 illustrate the opening operation process.

[0213] First, we will explain the input operation diagrams of FIGS. 14 to 20.

[0214] FIG. 14 is in an open state. Here, when the user rotates the operating handle (410) clockwise in the drawing (lifting the operating handle that was facing downward upward), the rotating side plate (421, 426) rotates clockwise. As the rotating side plate (421, 426) rotates, the first pressure part groove (432) receives the force of the first pressure part (423), and the main spring connecting plate (430) rotates together. At this time, the main spring rod (453) of the main spring assembly (450), which is axially coupled to the main spring connecting part (431) of the main spring connecting plate (430), is compressed, and elastic force is stored in the main spring (451).

[0215] As the inner rotating plate (426) rotates, the rotating part (428) also rotates together.

[0216] At this time, the main shaft (510) is not yet rotating and is in a fixed state, and the shaft lever (540) is also not moving.

[0217] FIG. 15 shows the rotating side plate (421, 426) and the rotating action part (428) in a state where they have been rotated at a predetermined angle. The rotating action part (428) rotates and moves away from the link contact part (774) of the lower link (770). Accordingly, the lower link (770) is freed from the restraint of the rotating action part (428). However, since the lower lever (760) is restrained by the shaft lever (540), the movement of the lower lever (760) and the lower link (770) is still restricted.

[0218] Meanwhile, the main spring assembly (450) is in a compressed state for a predetermined distance.

[0219] FIG. 16 shows the rotating side plate (421, 426) in a further rotated state. The rotating action part (428) contacts the entry part (562) of the release latch (560) and begins to push the release latch (560). Accordingly, the rebound release latch assembly (550) rotates clockwise around the latch rotation axis (551) and moves away from the shaft lever (540).

[0220] Refer to FIG. 17. When the rotating side plate (421, 426) rotates further, the rotating action part (428) passes the entry part (562) of the release latch (560) and contacts the contact part (564), and the rebound release latch assembly (550) is in a state where it is furthest away from the shaft lever (540).

[0221] Refer to FIG. 18. The rotating side plate (421, 426) rotates further so that the rotating action part (428) reaches the lower part of the contact part (564) of the release latch (560), and the main spring assembly (450) connected to the main spring connecting plate (430) passes through a dead point corresponding to the main shaft (510). The main spring assembly (450) is in a maximally compressed state.

[0222] Refer to FIG. 19. As the rotating side plates (421, 426) rotate further, the main spring assembly (450) passes the dead point and extends as the stored elastic force is restored. As the main spring assembly (450) extends, the main spring connecting plate (430) is rotated further clockwise, and the main shaft connecting plate (440) also rotates due to the contact between the first locking part (434) and the first locking groove (444). Accordingly, the main shaft (510) coupled to the main shaft connecting plate (440) also rotates. When the main shaft (510) rotates, the shaft lever (540) also rotates. At this time, since the rebound retention latch assembly (550) is in a rearwardly displaced state, the restraining latch (570) cannot restrain the rotation of the shaft lever (540).

[0223] As the shaft lever (540) rotates, the lower lever (760) is released from the constraint of the shaft lever (540). Due to the force of the lever return spring (757), the lower lever (760) and the lower link (770) rotate clockwise around the lever axis (750) and move forward.

[0224] In conjunction with the movement of the lower link (770), the upper link (775) is pulled downward, and the upper lever (780) rotates clockwise around the upper axis (797). As the counter actuation part (785) of the upper lever (780) rotates, it acts the counter lever (742) of the counter (740).

[0225] Meanwhile, as the shaft link (520) and the connecting link (530) move according to the rotation of the main shaft (510), the movable contactor (320) rotates.

[0226] Refer to FIG. 20. The main spring assembly (450) is fully extended to rotate the main spring connecting plate (430) and the main shaft (510) is also rotated to enter the insertion state. The shaft link (520) and the connecting link (530) are extended. When the insertion action is completed, the movable contactor (320) contacts the fixed contactor (310).

[0227] Next, the opening operation diagrams of FIGS. 20 to 25 will be explained.

[0228] FIG. 20 is the insertion state. Here, as shown in FIG. 21, when the user rotates the operating handle (410) in a counterclockwise direction (when the operating handle that was facing upward is lowered), the rotating side plate (421, 426) rotates in a counterclockwise direction. As the rotating side plate (421, 426) rotates, the second pressure part groove (433) receives the force of the second pressure part (424), and the main spring connecting plate (430) rotates together. At this time, the main spring rod (453) of the main spring assembly (450) is compressed, and elastic force is stored in the main spring (451).

[0229] As the inner rotating plate (426) rotates, the rotating part (428) also rotates together.

[0230] At this time, the main shaft (510) is not yet rotating and is in a fixed state, and the shaft lever (540) is also not moving.

[0231] FIG. 21 shows the rotating side plate (421, 426) and the rotating action part (428) in a state where they have been rotated at a predetermined angle. The main spring assembly (450) is in a state where it has been compressed by a predetermined distance.

[0232] FIG. 22 shows a state in which the rotating side plate (421, 426) is further rotated. The rotating action part (428) passes through the contact part (564) of the release latch (560) to the entry part (562), and the restraint on the release latch (560) is reduced. The rebound release latch assembly (550) rotates counterclockwise around the latch rotation axis (551) and moves closer to the shaft lever (540).

[0233] Refer to FIG. 23. When the rotating side plate (421, 426) rotates further, the rotating action part (428) is released from the release latch (560), and the rebound release latch assembly (550) is in a state closest to the shaft lever (540).

[0234] The main spring assembly (450) connected to the main spring connecting plate (430) passes through a dead point corresponding to the main shaft (510). The main spring assembly (450) is in a maximally compressed state.

[0235] The rotating action part (428) contacts the link contact part (774) of the lower link (770) and pushes the lower link (770) backward. Since the lower link (770) and the lower lever (760) move together, the lower lever (760) also moves backward.

[0236] Refer to FIG. 24. As the rotating side plates (421, 426) rotate further, the main spring assembly (450) passes the dead point and extends as the stored elastic force is restored. As the main spring assembly (450) extends, the main spring connecting plate (430) rotates further, and the main shaft connecting plate (440) also rotates due to the contact between the second locking part (435) and the second locking groove (445). Accordingly, the main shaft (510) coupled to the main shaft connecting plate (440) also rotates. When the main shaft (510) rotates, the shaft lever (540) also rotates. At this time, the shaft lever (540) rotates while pushing the restraining latch (570).

[0237] The lower link (770) and the lower lever (760) are in a state where they have been fully moved backward by the rotational actuation part (428). Accordingly, the shaft lever (540) rotates without interference from the lower lever (760).

[0238] As the lower link (770) rotates, the upper link (775) moves upward and the upper lever (780) rotates. As the counter actuating part (785) moves downward, the counter lever (742) of the counter (740) rotates downward.

[0239] Meanwhile, as the shaft link (520) and the connecting link (530) move according to the rotation of the main shaft (510), the movable contactor (320) rotates.

[0240] Refer to FIG. 25. The main spring assembly (450) is fully extended to rotate the main spring connecting plate (430) and the main shaft (510) is also rotated to open. The shaft lever (540) rotates to disengage from the restraining latch (570), and the rebound release latch assembly (550) moves forward by the force of the latch return spring (555) and enters the lower part of the shaft lever (540). The shaft lever (540) is placed on the restraining part (575) of the restraining latch (570).

[0241] The shaft lever (540) rotates without interference from the lower lever (760) and gets caught in the receiving portion (761) of the lower lever (760).

[0242] The shaft link (520) and the connecting link (530) are in a folded state. When the opening action is completed, the movable contactor (320) is completely separated from the fixed contactor (310).

[0243] When opening is completed as shown in Fig. 25, the shaft lever (540) is restrained by the restraining latch (570) and clockwise rotation is restricted, so even if rebounding occurs on the main shaft (510) due to the repulsive force resulting from the extension of the main spring assembly (450), re-insertion is prevented.

[0244] According to a load-blocking switch in one aspect of the present invention, a shaft lever and a rebound-prevention latch assembly are provided to prevent a rebound phenomenon occurring after blocking.

[0245] Once opening is complete, the shaft lever is constrained by the restraining latch of the anti-rebound latch assembly, thereby restricting rotation in the insertion direction; thus, even if rebound occurs on the main shaft due to the repulsive force resulting from the extension of the main spring assembly, re-insertion is prevented.

[0246] When the insertion action is performed, the rebound prevention latch assembly is disengaged from the shaft lever by the rotating part provided on the rotating side plate, thereby preventing interference.

[0247] According to a load-blocking switch in another aspect of the present invention, a counter assembly is provided to count the number of closing operations. Accordingly, it is possible to manage the history and durability of the device.

[0248] The counter assembly is provided with a lower lever that contacts or separates from the shaft lever of the main shaft, so it is separated in sections other than the counting operation, thereby preventing the transmission of impact from the main shaft.

[0249] The counter assembly is equipped with a lower link that contacts and separates from a rotating action part provided on a rotating side plate, thereby avoiding contact with the shaft lever during the blocking operation section.

[0250] The embodiments described above illustrate the best embodiments for implementing the present invention, and those skilled in the art will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, these embodiments are merely for illustrative purposes, not for limiting the technical concept of the present invention. Consequently, it should be understood that the scope of the technical concept of the present invention is not limited by these embodiments. That is, the scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

[0251] (Explanation of symbols)

[0252] 100 frame section

[0253] 110, 120 both side panels

[0254] 112 working hole

[0255] 130 Shear section frame

[0256] 140,150 terminal frames

[0257] 200 Terminal Section

[0258] 210 Power side terminal

[0259] 220 Load-side terminal

[0260] 310 fixed contact

[0261] 312 Fixed contacts

[0262] 320 movable contacts

[0263] 322 operating contacts

[0264] 400 mechanism parts

[0265] 410 control handle

[0266] 415 Rotating plate lever

[0267] 420 Turntable Assembly

[0268] 421,426 Rotating side plate

[0269] 423,424 Pressurizing section

[0270] 428 Rotating Actuator

[0271] 430 Main Spring Connection Plate

[0272] 432,433 Pressure part groove

[0273] 434,435 catch

[0274] 440 Main Shaft Connecting Plate

[0275] 444,445 locking groove

[0276] 450 Main Spring Assembly

[0277] 510 Main Shaft

[0278] 520 Shaft Link

[0279] 530 Links

[0280] 540 Shaft Lever

[0281] 550 Rebound Prevention Latch Assembly

[0282] 551 Latch Rotating Shaft

[0283] 553 Shaft Bushing

[0284] 555 Latch Return Spring

[0285] 557 connection pin

[0286] 560 Release Latch

[0287] 570 restraint latch

[0288] 600 Arc Soho Department

[0289] 610,620 arc chamber

[0290] 630 Arc fixed contact

[0291] 631 Arc fixed contactor first body

[0292] 632 First arc fixed contact

[0293] 633,638 central protrusion

[0294] 636 Arc fixed contactor second body

[0295] 637 Second arc fixed contact

[0296] 640 Arc movable contact

[0297] 642 Arc operating contact

[0298] 650 rotation limit plate

[0299] 660 Return Spring

[0300] 670 movable axis

[0301] 700 Counter Assembly

[0302] 710 1st bracket

[0303] 720 2nd bracket

[0304] 730 3rd bracket

[0305] 740 Counter

[0306] 750 lever shaft

[0307] 757 Lever Return Spring

[0308] 760 bottom lever

[0309] 770 lower link

[0310] 775 upper link

[0311] 780 top lever

[0312] 785 Counter Actuator

[0313] 790 middle pin

[0314] 793 lower pin

[0315] 795 upper pin

[0316] 797 upper shaft

Claims

A main shaft that rotates a movable contact to contact or separate from a fixed contact; An operating handle provided on one side of the main shaft to provide power; A shaft lever fixed to the main shaft and rotating together with it; and A rebound prevention latch assembly rotatably installed on one side of the above-mentioned operating handle, which prevents rotation of the shaft lever in the insertion direction when blocked, Load blocking switch with rebound prevention function. In paragraph 1, A load-blocking switch having a rebound prevention function, wherein a rotating side plate coupled to the main shaft and rotated by the operating handle has a rotating working part formed protrudingly that contacts or separates from the rebound prevention latch assembly. In paragraph 2, A load-blocking switch having a rebound prevention function, wherein an operating hole is formed in one side plate of the frame portion where the main shaft is installed, into which the rotating operating part is inserted and can rotate. In paragraph 2, The above rebound retention latch assembly is, A latch rotation axis fixed to one side plate of the above-mentioned frame part; A release latch rotatably coupled to the above latch rotation axis and the rotational working part contacting or separating; and A load-blocking switch having a rebound prevention function, comprising a restraining latch that is rotatably coupled to the above-mentioned latch rotation axis and contacts or separates from the above-mentioned shaft lever. In paragraph 4, A load-blocking switch having a rebound prevention function, further comprising a connecting pin inserted through the release latch and the restraint latch. In paragraph 5, A load-blocking switch having a rebound prevention function, further comprising a latch return spring installed on the latch rotation axis and having one end supported by the connecting pin to provide rotational force to the release latch and the restraint latch. In paragraph 4, The above-mentioned release latch is a load-blocking switch having a rebound prevention function, wherein an entry portion having an inclination at a predetermined angle is formed on the surface facing the main shaft. In Paragraph 7, The above release latch is a load-blocking switch having a rebound prevention function, wherein a contact portion having a steeper slope than the slope of the entry portion is provided at the lower part of the entry portion. In paragraph 4, The above-mentioned restraining latch is a load-blocking switch having a rebound prevention function, wherein a restraining portion is provided on the upper surface on which the shaft lever can be placed. In Paragraph 9, The above restraining latch is a load-blocking switch having a rebound prevention function, wherein a lever contact portion is formed at an angle on the surface facing the main shaft. In paragraph 4, A load-blocking switch having a rebound prevention function, wherein a stopper that restricts forward movement is provided on the front portion of the above-mentioned restraining latch.

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