Cap member and cradle for air circuit breaker comprising same

Abstract

Disclosed are a cap member and a cradle for an air circuit breaker comprising same. A cap member according to an aspect of the present invention comprises: a cap base formed in a planar shape; a cap body which is coupled to one surface of the cap base, has a height in the thickness direction of the cap base, and extends from the radially inner side of the outer circumference of the cap base in the outer circumferential direction of the cap base; a nut accommodation space which is surrounded and defined by the cap base and the cap body, and accommodates a nut member; and a cap protrusion which is located at the end portion of the cap body in the height direction and protrudes radially inward, wherein the cap protrusion can be configured to be hook-coupled to the outer circumference of the nut member.

Description

Cap member and cradle for an air circuit breaker including the same

[0001] The present invention relates to a cap member and a cradle for an air circuit breaker including the same, and more specifically, to a cap member having a structure with improved insulation performance and a cradle for an air circuit breaker including the same.

[0002] A circuit breaker refers to a device capable of allowing or blocking external power supply through the contact and separation of fixed contacts and movable contacts. The fixed contacts and movable contacts provided in the circuit breaker are each connected to an external power source or load to enable power supply.

[0003] A movable contact is movably provided on the circuit breaker. The movable contact can be moved toward or away from the fixed contact. When the movable contact and the fixed contact come into contact, the circuit breaker can be electrically connected to an external power source or load.

[0004] When a movable contact moves and separates from a fixed contact, the current flowing through it is converted into an arc. An arc can be defined as a flow of electrons at high temperature and high pressure. If the arc remains inside the circuit breaker, there is a risk of thermal damage to the breaker's components. Therefore, to rapidly extinguish and discharge the generated arc, circuit breakers are generally equipped with a component called an arc extinguishing device.

[0005] Arcs have the characteristic of progressing toward a peak. Therefore, it is desirable to avoid placing protruding components inside the circuit breaker as much as possible.

[0006] Meanwhile, for various reasons, circuit breakers are formed by combining multiple frames rather than being formed as a single frame. Accordingly, fastening members such as bolts or nuts are provided at the points where each frame is joined. In this case, since the bolts are positioned so that their ends are exposed within the internal space of the circuit breaker, there is a high probability that the generated arc will propagate toward the bolts.

[0007] In the above case, there is a risk that the bolts will be damaged by the arc, and consequently, the connection state of each frame constituting the circuit breaker will be weakened.

[0008] Accordingly, a method is required to protect the member for combining multiple frames constituting the circuit breaker.

[0009] Korean Registered Patent Document No. 10-2482385 discloses a switchboard having a load-side power management control function based on upper and lower comparative analysis and a function to prevent short-circuit accidents caused by overheating. Specifically, it discloses a switchboard equipped with an overheating prevention terminal block having a temperature monitoring function to solve problems such as insulation breakdown caused by faulty bolt tightening when connecting a load.

[0010] However, the switchboard disclosed in the aforementioned prior art only provides a method for detecting temperature using electronic means and determining whether insulation breakdown has occurred based on the detected temperature. In other words, the prior art fails to provide a method for preventing the generated arc from advancing toward the bolt itself.

[0011] Furthermore, the switchboard disclosed in the aforementioned prior art is limited to providing a configuration for implementing the flow of each piece of information. In other words, the prior art does not provide a method for protecting the bolts by a physical means.

[0012] Japanese Patent Publication No. 2005-327481 discloses a mold case for a circuit breaker and a mold for molding the same. Specifically, it discloses a mold case for a circuit breaker in which a lower case and an upper cover are overlapped and the case and cover are twisted together with a tapping screw to be joined as a single unit. The aforementioned prior art discloses that the lower case and the upper cover are joined by a tapping screw, thereby improving durability against arc pressure.

[0013] However, the mold case, etc. disclosed in the aforementioned prior art is limited to providing a method for joining the lower case and the upper cover. That is, the prior art does not provide a method for protecting the tapping screw itself that joins the lower case and the upper cover.

[0014] Korean Registered Patent Document No. 10-2482385 (December 23, 2022)

[0015] Japanese Patent Publication No. 2005-327481 (November 24, 2005)

[0016] The present invention is intended to solve the above-mentioned problems, and the objective of the present invention is to provide a cap member with a structure having improved insulation performance and a cradle for an air circuit breaker including the same.

[0017] Another objective of the present invention is to provide a cap member having a structure that can simply improve insulation performance and a cradle for an air circuit breaker including the same.

[0018] Another objective of the present invention is to provide a cap member having a structure that can prevent damage to a fastening member caused by an arc, and a cradle for an air circuit breaker including the same.

[0019] Another objective of the present invention is to provide a cap member having a structure in which the configuration for protecting a fastening member does not affect other configurations, and a cradle for an air circuit breaker including the same.

[0020] Another objective of the present invention is to provide a cap member having a structure in which the combined state of the above configuration and the fastening member can be stably maintained, and a cradle for an air circuit breaker including the same.

[0021] Another objective of the present invention is to provide a cap member having a structure in which the above configuration and the fastening member can be easily combined, and a cradle for an air circuit breaker including the same.

[0022] The problems of the present invention are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art to which the present invention pertains from the description below.

[0023] According to one aspect of the present invention, a cap member is provided, comprising: a cap base formed in a plate shape; a cap body coupled to one side of the cap base, having a height in the thickness direction of the cap base, and extending in the direction of the outer circumference of the cap base from the radially inner side of the outer circumference of the cap base; a nut receiving space defined by being enclosed by the cap base and the cap body and accommodating a nut member; and a cap projection located at the end in the height direction of the cap body and protruding radially inward, wherein the cap projection is configured to be hook-coupled with the outer circumference of the nut member.

[0024] At this time, the cap base may be provided with a cap member formed such that its cross-section has an area larger than the cross-section of the nut member.

[0025] In addition, a cap member may be provided, wherein the cap body is formed of a hard material having a predetermined elasticity and configured to be shape-deformable toward the radially inward or radially outward.

[0026] At this time, a cap member may be provided in which the outer circumference of the cap body has a polygonal shape, and the cap projection is formed in a portion of the cap body such that its cross-section corresponds to a side of the polygon.

[0027] Additionally, a cap member may be provided in which the cap body comprises a plurality of parts corresponding to the side and continuous with one another, and the cap projection is formed on one of the plurality of parts of the cap body that are adjacent to one another, so that the end of the cap body and the cap projection are alternately positioned along the plurality of parts of the cap body.

[0028] At this time, a cap member may be provided that includes an incision groove formed by sinking into a portion of the cap body such that its cross-section corresponds to a vertex of the polygon.

[0029] Additionally, the cap body may include a plurality of parts corresponding to the side and continuous with one another, and the incision groove is formed in each of the parts where the plurality of parts of the cap body are continuous, so that the end of the cap body or the cap projection and the incision groove are alternately positioned along the plurality of parts of the cap body.

[0030] Additionally, according to one aspect of the present invention, a cradle for an air breaker is provided, comprising: a cradle body having a cradle space formed therein into which an air breaker is inserted; a cover member covering the cradle space and coupled to the cradle body; a nut member coupled to a bolt member provided in the cradle body; and a cap member coupled to the cover member and the nut member and blocking the bolt member and the nut member from the cradle space, wherein the cover member includes a cap coupling portion through which one end of the bolt member is penetrated and coupled to the nut member and the cap member, and the cap member includes a cap body coupled to the nut member and coupled to the cap coupling portion; and a cap base continuous with the cap body and covering the cap coupling portion, the nut member and the bolt member.

[0031] At this time, a cradle for an air circuit breaker may be provided, wherein the cross-sectional area of ​​the cap base is formed to be greater than or equal to the cross-sectional area of ​​the cap coupling portion, so that the cap base completely covers the cap coupling portion.

[0032] Additionally, a cradle for an air breaker may be provided, wherein the cap coupling portion comprises: a cap receiving space formed by being recessed on one side of the surface of the cover member facing the cradle space; and a cradle through hole located in the cap receiving space and formed through the cover member through which the bolt member passes.

[0033] At this time, a cradle for an air circuit breaker may be provided, wherein the cap receiving space is formed to have a polygonal cross-section, the outer circumference of the cap body is formed to have a polygonal shape corresponding to the shape of the cross-section of the cap receiving space, and the outer circumference of the nut member is formed to have a polygonal shape corresponding to the shape of the outer circumference of the cap body.

[0034] Additionally, a cradle for an air circuit breaker may be provided, wherein the cap coupling portion includes an insertion groove formed by being recessed on one inner surface opposite to the cradle space, and one end of the cap body opposite to the cradle space is received in the insertion groove.

[0035] At this time, a cradle for an air breaker may be provided, wherein the cap member includes a cap projection positioned at the height-direction end of the cap body and protruding radially inward, and the cap projection is configured to be hook-coupled with the outer circumference of the nut member.

[0036] In addition, the above-mentioned cap projection may be provided with a cradle for an air circuit breaker that is received in the insertion groove.

[0037] At this time, the cap coupling portion includes a cap receiving space formed by being recessed on one side of the surface of the cover member facing the cradle space, and the cap base is formed to have a cross-sectional area larger than the cap receiving space, so that the cap member covers the cap receiving space and is coupled to the cap coupling portion, thereby providing a cradle for an air circuit breaker.

[0038] According to the above configuration, the insulation performance of the cap member according to the embodiment of the present invention and the cradle for an air circuit breaker including the same can be improved.

[0039] In addition, according to the above configuration, the cap member according to the embodiment of the present invention and the cradle for an air circuit breaker including the same can have their insulation performance simply improved.

[0040] In addition, according to the above configuration, the cap member according to the embodiment of the present invention and the cradle for an air circuit breaker including the same can prevent damage to the fastening member caused by the generated arc.

[0041] In addition, according to the above configuration, the cap member according to the embodiment of the present invention and the cradle for an air circuit breaker including the same may have a configuration for protecting the fastening member that does not affect other configurations.

[0042] In addition, according to the above configuration, the cap member according to the embodiment of the present invention and the cradle for an air circuit breaker including the same can stably maintain the combined state of the above configuration and the fastening member.

[0043] In addition, according to the above configuration, the cap member and the cradle for an air circuit breaker including the same according to the embodiment of the present invention can be easily combined with the said configuration and the fastening member.

[0044] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

[0045] FIG. 1 is a perspective view illustrating an air-circuit breaker according to an embodiment of the present invention.

[0046] FIG. 2 is a perspective view showing the state in which the breaker of FIG. 1 is withdrawn from the cradle.

[0047] FIG. 3 is an exploded perspective view illustrating each configuration of the cradle for the air circuit breaker of FIG. 1.

[0048] FIGS. 4 and FIGS. 5 are perspective views illustrating a cover member provided in a cradle for an air circuit breaker of FIG. 1.

[0049] FIG. 6 is an exploded perspective view illustrating the cover member, cap member, and nut member of the cradle for the crane circuit breaker of FIG. 1.

[0050] FIG. 7 is a side view illustrating the cover member of FIG. 4 and FIG. 5.

[0051] Figure 8 is an enlarged view of part A of Figure 7.

[0052] FIGS. 9 and FIGS. 10 are perspective views illustrating a cap member and a nut member provided in a cradle for an air circuit breaker of FIG. 1.

[0053] FIG. 11 is a side view illustrating the cap member and nut member of FIG. 9 and FIG. 10.

[0054] FIG. 12 is a perspective view illustrating the combined structure of the cover member, cap member, and nut member of FIG. 6.

[0055] FIG. 13 is a CC perspective cross-sectional view illustrating the combined structure of the cover member, cap member, and nut member of FIG. 12.

[0056] Figure 14 is an enlarged view of part B of Figure 13.

[0057] FIG. 15 is a DD cross-sectional view illustrating the combined structure of the cover member, cap member, and nut member of FIG. 12.

[0058] Fig. 16 is an enlarged view of part C of Fig. 15.

[0059] FIG. 17 is an AA perspective cross-sectional view illustrating a cradle for an air circuit breaker of FIG. 1.

[0060] FIG. 18 is a BB plan cross-sectional view illustrating the cradle for the crane breaker of FIG. 1.

[0061] Fig. 19 is an enlarged view of section D of Fig. 18.

[0062] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the description in the drawings have been omitted, and the same reference numerals have been used throughout the specification for identical or similar components.

[0063] The words and terms used in this specification and claims are not limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention in accordance with the principles by which the inventor defines terms and concepts to best describe his invention.

[0064] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to preferred embodiments of the present invention and do not represent all technical ideas of the present invention; thus, various equivalents and modifications that may replace such configurations may exist at the time of filing the present invention.

[0065] In the following description, descriptions of some components may be omitted to clarify the features of the present invention.

[0066]

[0067] In the following description, the term "connection" refers to one or more members being connected to each other in a manner that allows for fluid communication. In one embodiment, the connection may be formed by members such as a conduit, a pipe, or a piping system. In the following description, the term "connection" may be used interchangeably with the meaning that one or more members are "fluidly connected" to each other.

[0068] In the following description, the term "conduction" means that one or more components are connected to each other to transmit current or electrical signals. In one embodiment, the conduction may be formed in a wired form by a conductor member, etc., or in a wireless form such as Bluetooth, Wi-Fi, or RFID. In one embodiment, the conduction may include the meaning of "communication."

[0069] As used in the following description, the term "fluid" refers to any form of substance that flows due to an external force and whose shape or volume, etc., can be deformed. In one embodiment, the fluid may be a liquid such as water or a gas such as air.

[0070] The terms "upper side," "lower side," "left side," "right side," "front side," and "rear side" used in the following description shall be understood by referring to the coordinate system depicted throughout the attached drawings.

[0071]

[0072] Referring to FIGS. 1 to 3, a cradle (10) and an air circuit breaker (20) according to an embodiment of the present invention are illustrated. The air circuit breaker (20) according to an embodiment of the present invention may be electrically connected to an external power source and a load. The air circuit breaker (20) may be configured to allow or block electrical connection between the external power source and the load.

[0073] In the illustrated embodiment, the cradle (10) can be electrically connected to an external power source and load via an air circuit breaker (20). That is, the cradle (10) can be inserted into the air circuit breaker (20) and electrically connected to the air circuit breaker (20). Additionally, the air circuit breaker (20) can be maintained in a state of constant connection to the external power source and load. Accordingly, the cradle (10) can be electrically connected to the external power source and load.

[0074] The air circuit breaker (20) may be provided in any form that is combined with the cradle (10) to allow or block electrical connection between an external power source and a load. In one embodiment, the air circuit breaker (20) may be provided as an air circuit breaker that utilizes air as a blocking medium. In the above embodiment, the air circuit breaker (20) may utilize air as a blocking medium to extinguish a generated arc.

[0075] The air circuit breaker (20) may include any configuration electrically connected to an external power source and load. In one embodiment, the air circuit breaker (20) may be configured to include a fixed contact and a movable contact. The fixed contact and the movable contact may be electrically connected to either one of the external power source and load and the other, respectively.

[0076] As the name suggests, the fixed contact can be fixedly provided at a specific location. The movable contact can be provided to be movable in a direction toward the fixed contact and in a direction opposite thereto. When the fixed contact and the movable contact come into contact, the external power source and the load can be electrically connected. When the fixed contact and the movable contact are separated, the external power source and the load can be electrically cut off from each other.

[0077] Meanwhile, if the fixed contact and the movable contact are separated, an arc may be generated by the energy of the current being conducted. An arc is a flow of electrons at high temperature and high pressure, and if the arc remains continuously inside the cradle (10), there is a risk that the structure of the cradle (10) may be damaged. In particular, it is known that the arc tends to move toward the peak.

[0078] Meanwhile, the interior of the cradle (10) may be provided with a fastening member for fixing the components of the cradle (10), such as a bolt member (130) to be described later. Due to its structural characteristics, the end of the bolt member (130) is formed in the shape of a pointed tip. When the end of the bolt member (130) is exposed in the interior space of the cradle (10), a portion of the arc generated from the circuit breaker (20) may extend toward the end of the bolt member (130).

[0079] In this case, the bolt member (130) may be damaged by the arc, causing insulation breakdown. If the above process is repeated, there is a risk that the connection between the components of the cradle (10) joined by the bolt member (130) will be destroyed.

[0080] Accordingly, the cradle (10) according to an embodiment of the present invention is configured so that the tip of the bolt member (130) is not exposed to the internal space of the cradle (10). Accordingly, an arc generated in the circuit breaker (20) is prevented from proceeding toward the bolt member (130), thereby preventing insulation breakdown of the bolt member (130). As a result, the connection state between the components of the cradle (10) can be stably maintained.

[0081] The above effect is achieved by a cap member (300), and a detailed description thereof will be provided later.

[0082] In the embodiments illustrated in FIGS. 3 to 10, the cradle (10) includes a cradle body (100), a cover member (200), a cap member (300), and a nut member (400).

[0083] The cradle body (100) forms a part of the outer shape of the cradle (10). A space is formed inside the cradle body (100) to accommodate a pull-out air circuit breaker (20). The cradle body (100) may be equipped with a configuration that is electrically connected to the air circuit breaker (20).

[0084] An air circuit breaker (20) housed inside the cradle body (100) can be electrically connected to the above configuration. The above configuration is electrically connected to an external power source and a load, respectively. Accordingly, the cradle body (100) and the external power source and load can be electrically connected to each other.

[0085] The cradle body (100) is combined with a cover member (200). One side in the height direction of the cradle body (100), the upper side in the illustrated embodiment, is combined with the cover member (200). The space formed inside the cradle body (100) can be partially covered by the cover member (200).

[0086] The configuration for combining the cradle body (100) and the cover member (200), namely the bolt member (130) and the nut member (400) to be described later, may not be exposed in the internal space of the cradle body (100) by means of the cap member (300).

[0087] The cradle body (100) can be any shape capable of receiving an air circuit breaker (20) so as to be retractable, being electrically connected to the received air circuit breaker (20), an external power source, and a load, respectively, and being combined with a cover member (200). In the illustrated embodiment, the cradle body (100) is a three-dimensional shape having a length in the left-right direction, a width in the front-back direction, and a height in the up-down direction.

[0088] The cradle wall (110) forms a part of the outer shape of the cradle body (100). The cradle wall (110) is the part where the cradle body (100) is joined to the cover member (200). The cradle wall (110) can support the cover member (200). The configuration that joins the cradle wall (110) and the cover member (200), namely the bolt member (130) to be described later, may be joined to the cap member (300) so as not to be exposed inside the cradle body (100).

[0089] The cradle wall (110) partially surrounds the cradle space (120). In the illustrated embodiment, the cradle wall (110) surrounds the cradle space (120) along its length, either the left or the right side in the illustrated embodiment.

[0090] Multiple cradle walls (110) may be provided. Multiple cradle walls (110) may surround the cradle space (120) at different locations and each may be connected to a cover member (200). In the illustrated embodiment, a pair of cradle walls (110) are provided and spaced apart in the longitudinal direction of the cradle space (120), i.e., in the left-right direction. A pair of cradle walls (110) are arranged facing each other with the cradle space (120) in between.

[0091] A pair of cradle walls (110) are each joined to a pair of cradle joining members (220). Such joining can be achieved by bolt members (130).

[0092] The cradle wall (110) may be of any shape that is combined with and supports the cover member (200) and can surround each side in the longitudinal direction of the cradle space (120). In the illustrated embodiment, the cradle wall (110) is formed as a polygonal plate having a length in the front-rear direction, a height in the up-down direction, and a thickness in the left-right direction.

[0093] A plurality of through holes may be formed inside the cradle wall (110). A bolt member (130) may be connected through at least some of the through holes.

[0094] The cradle space (120) is a space formed inside the cradle body (100). The cradle space (120) accommodates a crane breaker (20) in a retractable manner. The cradle space (120) may be at least partially enclosed by the cradle wall (110) and the cover member (200).

[0095] In the illustrated embodiment, the cradle space (120) is enclosed on each side in its longitudinal direction, namely the left and right sides, by a pair of cradle walls (110). One side in the height direction of the cradle space (120), the upper part in the illustrated embodiment, is enclosed by a cover member (200).

[0096] The cradle space (120) partially accommodates the cover member (200). That is, the cradle space (120) can accommodate one side in the height direction of the cover member (200), i.e., the lower part.

[0097] A bolt member (130) and a nut member (400) are positioned in the cradle space (120). At this time, the bolt member (130) and the nut member (400) may be surrounded by a cap member (300) so as not to be exposed in the cradle space (120). A detailed explanation of this will be provided later.

[0098] A configuration for electrically connecting the cradle (10) to an external power source and load may be located in the cradle space (120). An air circuit breaker (20) housed in the cradle space (120) may be electrically connected in combination with the configuration.

[0099] The cradle space (120) may be of any shape capable of retractably accommodating the air breaker (20) and partially accommodating other configurations of the cradle (10). In the illustrated embodiment, the cradle space (120) is a three-dimensional shape having a length in the left-right direction, a width in the front-back direction, and a height in the up-down direction. The shape of the cradle space (120) may be changed to correspond to the shape of the air breaker (20).

[0100] The bolt member (130) joins the cradle wall (110) and the cover member (200). The bolt member (130) can be inserted through the cradle wall (110) and the cover member (200) respectively to join them. At this time, the end of the bolt member (130) can be positioned in the cradle space (120).

[0101] The bolt member (130) is combined with the cap member (300). The end of the bolt member (130) may be covered by the cap member (300) and not exposed to the cradle space (120). Accordingly, an arc generated in the air circuit breaker (20) is prevented from advancing to the bolt member (130), thereby preventing insulation breakdown of the bolt member (130) caused by the arc.

[0102] The bolt member (130) is joined with the nut member (400). The bolt member (130) can be secured by the nut member (400). Accordingly, the cradle wall (110) and the cover member (200) can also be securedly joined.

[0103] The bolt member (130) may be provided in any shape that is combined with the nut member (400) to join the cradle wall (110) and the cover member (200), and is covered by the cap member (300) so as not to be exposed to the cradle space (120). In the illustrated embodiment, the bolt member (130) is provided in the form of a bolt. In the above embodiment, threads may be formed on the outer circumference of the bolt member (130).

[0104] In the above embodiment, a head may be formed on the outer side in the longitudinal direction of the bolt member (130). Additionally, an end may be positioned without a head on the inner side in the longitudinal direction of the bolt member (130).

[0105] That is, in the illustrated embodiment, for the bolt member (130) coupled to the left cradle wall (110), the head may be located outside the cradle space (120) and the other end may be located inside the cradle space (120). Additionally, for the bolt member (130) coupled to the right cradle wall (110), the head may be located outside the cradle space (120) and the other end may be located inside the cradle space (120).

[0106] Multiple bolt members (130) may be provided. Multiple bolt members (130) may be connected to the cradle wall (110) and the cover member (200) at different locations, respectively.

[0107] In the illustrated embodiment, a total of six bolt members (130) are provided. Three bolt members (130) located on the left side join the left cradle wall (110) and cover member (200). Three bolt members (130) located on the right side join the right cradle wall (110) and cover member (200).

[0108] A detailed description of the technical feature in which the end of each bolt member (130) is joined with the cap member (300) so as not to be exposed to the cradle space (120) and thereby protected from the arc generated therefrom will be provided later.

[0109] The cover member (200) constitutes another part of the exterior shape of the cradle (10). The cover member (200) is joined to the cradle wall (110) by means of a bolt member (130) and a nut member (400) and can be accommodated at least partially in the cradle space (120). Additionally, the cover member (200) can cover one side in the height direction of the cradle space (120), i.e., the upper side.

[0110] Additionally, the cover member (200) can be combined with the cap member (300). The cap member (300) covers the end of the bolt member (130) and can be combined with the cover member (200) and the nut member (400), respectively. The cover member (200) can at least partially accommodate the cap member (300).

[0111] The cover member (200) can be grasped by a worker or an external device. The cradle (10) can be moved by an external force applied to the cover member (200). To this end, a groove may be formed in the cover member (200) for inserting a worker's hand or an external device.

[0112] In the embodiments illustrated in FIGS. 4 to 8, the cover member (200) includes a cover body (210), a cradle coupling member (220), and a cap coupling part (230).

[0113] The cover body (210) constitutes the body of the cover member (200). The cover body (210) covers the cradle space (120) from the top and is partially accommodated in the cradle space (120).

[0114] The cover body (210) is coupled with a cradle coupling member (220). A cradle coupling member (220) is coupled to each side along the longitudinal direction of the cover body (210), the left and right sides in the illustrated embodiment. The aforementioned groove is formed in the cradle coupling member (220), so that the cover body (210) can be moved together by the cradle coupling member (220).

[0115] The cover body (210) may be of any shape that covers the cradle space (120), is partially accommodated in the cradle space (120), and can be coupled with the cradle coupling member (220). In the illustrated embodiment, the cover body (210) is a three-dimensional shape having a length in the left-right direction, a width in the front-back direction, and a height in the up-down direction.

[0116] The cradle connecting member (220) constitutes another part of the cover member (200). The cradle connecting member (220) is the part where the cover member (200) is connected to the cradle wall (110). The cradle connecting member (220) is at least partially accommodated in the cradle space (120).

[0117] The cradle coupling member (220) is coupled to the cover body (210). The cradle coupling member (220) is fixedly coupled to the cover body (210) so that they can move together. A groove is formed on the outer side of the cradle coupling member (220) so that a worker's body or any device can be inserted. The cradle coupling member (220) can be gripped by said body or said device.

[0118] A cap coupling portion (230) is formed on the cradle coupling member (220). The cradle coupling member (220) can be coupled to the cradle wall (110) by a bolt member (130) coupled to the cap coupling portion (230). Additionally, a cap member (300) and a nut member (400) can be coupled to the cradle coupling member (220) by the cap coupling portion (230).

[0119] A plurality of cradle coupling members (220) may be provided. A plurality of cradle coupling members (220) may each be coupled to a plurality of cradle walls (110) and cover bodies (210). In the illustrated embodiment, a pair of cradle coupling members (220) is provided.

[0120] A pair of cradle connecting members (220) are each connected to each side end in the longitudinal direction of the cover body (210), the left end and the right end in the illustrated embodiment. A pair of cradle connecting members (220) are each positioned adjacent to a pair of cradle walls (110) and can be connected to a pair of cradle walls (110) by a bolt member (130) and a nut member (400).

[0121] The cradle coupling member (220) may have any shape that can be coupled with the cradle wall (110) and the cover body (210). In the illustrated embodiment, the cradle coupling member (220) is a three-dimensional shape having a length in the front-rear direction longer than the width in the left-right direction and a height in the up-down direction. At this time, a groove for gripping may be formed on the outer side of the cradle coupling member (220), that is, on the left side of the left cradle coupling member (220) and on the right side of the right cradle coupling member (220).

[0122] A cap coupling member (230) is formed on one side in the height direction of the cradle coupling member (220), on the lower side in the illustrated embodiment.

[0123] The cap coupling portion (230) is the part where the cover member (200) is coupled with the bolt member (130), the cap member (300), and the nut member (400). The cap coupling portion (230) is located on one side in the height direction of the cradle coupling member (220), on the lower side in the illustrated embodiment. The cap coupling portion (230) is positioned to overlap with a through hole formed in the cradle wall (110), that is, a through hole through which the bolt member (130) passes.

[0124] A plurality of cap coupling portions (230) may be formed. The plurality of cap coupling portions (230) may be spaced apart in the width direction of the cover body (210) and in the front-rear direction in the illustrated embodiment, and may be coupled to a plurality of bolt members (130), cap members (300), and nut members (400), respectively.

[0125] In the illustrated embodiment, three cap coupling portions (230) are provided. The three cap coupling portions (230) are spaced apart in the front-rear direction and are each coupled to the bolt member (130), the cap member (300), and the nut member (400). The three cap coupling portions (230) may each be positioned to overlap with a through hole (i.e., formed through the cradle wall (110)) spaced apart in the front-rear direction.

[0126] In the illustrated embodiment, the cap coupling portion (230) includes a cap receiving space (231), an insertion groove (232), a buffer space (233), and a cradle through hole (234).

[0127] The cap receiving space (231) is a space in which the cap coupling part (230) receives the cap member (300) and the nut member (400). The cap receiving space (231) is formed by a recess on one side of the cradle coupling member (220) facing the cradle space (120).

[0128] In the illustrated embodiment, the cap receiving space (231) formed in the left cover member (200) is formed by being recessed on the right side of the cradle coupling member (220). Additionally, the cap receiving space (231) formed in the right cover member (200) is formed by being recessed on the left side of the cradle coupling member (220).

[0129] A plurality of insertion grooves (232) may be formed by being recessed in the cap receiving space (231). Additionally, the portion of the cap receiving space (231) excluding the portion where the insertion grooves (232) are formed may be defined as a buffer space (233). Furthermore, a cradle through-hole (234) formed through the width direction of the cradle coupling member (220) may be located inside the cap receiving space (231).

[0130] The cap receiving space (231) may have a shape corresponding to the shape of the cap member (300) or the nut member (400). In the illustrated embodiment, the cap receiving space (231) is formed as a space with a three-dimensional shape having a hexagonal cross-section and a height in the left-right direction.

[0131] Accordingly, the nut member (400) accommodated in the cap receiving space (231) can be prevented from rotating arbitrarily by the inner circumference of the cradle coupling member (220) surrounding the cap receiving space (231).

[0132] The insertion groove (232) is formed by being recessed into the inner circumference of the cradle coupling member (220) surrounding the cap receiving space (231). The insertion groove (232) accommodates the cap body (320) and the cap projection (330) of the cap member (300). The insertion groove (232) is positioned to surround the buffer space (233).

[0133] As the end of the cap body (320) or the cap projection (330) is received in the insertion groove (232), the cap member (300) can be inserted into the cap coupling portion (230) by a sufficient distance. Additionally, any rotation of the cap member (300) relative to the cap coupling portion (230) can be prevented.

[0134] The insertion groove (232) is formed by a recess in the inner circumference of the cradle coupling member (220) that surrounds the cap receiving space (231) from the outer side in the height direction. Additionally, the insertion groove (232) may be located adjacent to the inner circumference of the cradle coupling member (220) that surrounds the cap receiving space (231) from the radial outer side. The insertion groove (232) is located along the radial direction between the inner circumference of the cradle coupling member (220) and the cradle through hole (234).

[0135] The insertion groove (232) may be of any shape capable of accommodating the cap body (320) and the cap projection (330). In the illustrated embodiment, the insertion groove (232) has a square cross-section and a height in the left-right direction, and is a three-dimensional shape with its ends tapered.

[0136] Multiple insertion grooves (232) may be formed. Multiple insertion grooves (232) may be spaced apart from each other along the inner circumference of the cradle coupling member (220) that surrounds the cap receiving space (231) radially outward. In the illustrated embodiment, a total of six insertion grooves (232) are formed. The six insertion grooves (232) are each located on a portion corresponding to each side of the inner circumference of the cradle coupling member (220) having a hexagonal cross-section.

[0137] The insertion groove (232) may be located adjacent to the buffer space (233). The insertion groove (232) may surround the buffer space (233) along the outer circumference of the cap receiving space (231). In an embodiment where multiple insertion grooves (232) are formed, the insertion groove (232) and the buffer space (233) may be arranged alternately along the outer circumference of the cap receiving space (231).

[0138] The buffer space (233) may be defined as the portion of the cap receiving space (231) surrounded by the insertion groove (232). In the illustrated embodiment, the buffer space (233) may be defined as the radially outer portion of the cap receiving space (231), that is, the small space surrounded by the inner surface of the cradle coupling member (220) and the insertion groove (232) surrounding the cap receiving space (231) in the radial direction.

[0139] The buffer space (233) may be of any shape that can be enclosed by the insertion groove (232). In the illustrated embodiment, the buffer space (233) is formed as a space of a three-dimensional shape having a pentagonal cross-section and a height in the vertical direction. The radial inner side of the buffer space (233) is open and communicates with other parts of the cap receiving space (231).

[0140] The buffer space (233) is located adjacent to the insertion groove (232). The buffer space (233) is located at the vertex portion of the inner circumference of the cradle coupling member (220) having a hexagonal cross-section. The buffer space (233) is partially surrounded by the insertion groove (232), which is located at the edge portion of the inner circumference of the cradle coupling member (220).

[0141] Multiple buffer spaces (233) may be formed. Multiple buffer spaces (233) may be located adjacent to each of the multiple insertion grooves (232). In the illustrated embodiment, a total of six buffer spaces (233) are formed. The six buffer spaces (233) are alternately arranged with the six insertion grooves (232) along the outer circumference of the cap receiving space (231).

[0142] The cradle through hole (234) communicates the cap receiving space (231) with the cradle body (100). The cradle through hole (234) is the part where the bolt member (130) is connected to the cap connecting part (230).

[0143] The bolt member (130) can be coupled with the nut member (400) received in the cap receiving space (231) by passing through the cradle through hole (234). The cradle through hole (234) can be positioned to align with the through hole formed in the cradle wall (110) and the hollow formed inside the nut member (400).

[0144] The cradle through hole (234) is located inside the cap receiving space (231). The cradle through hole (234) is formed through the inner circumference of the cradle coupling member (220) in the width direction, and in the illustrated embodiment, in the left-right direction. The cradle through hole (234) is located spaced apart from the insertion groove (232) and the buffer space (233). The cradle through hole (234) is located radially inside the insertion groove (232) and the buffer space (233).

[0145] The cradle through hole (234) may be of any shape through which the bolt member (130) can be joined. In the illustrated embodiment, the cradle through hole (234) is formed as a disc-shaped opening having a circular cross-section and a thickness in the left-right direction.

[0146] The cap member (300) is combined with the bolt member (130) and the nut member (400) to cover them. The cap member (300) is configured to prevent the end of the bolt member (130) and the nut member (400) from being exposed to the cradle space (120). Accordingly, damage to the end of the bolt member (130), i.e., the pointed end, and the nut member (400) by an arc can be prevented.

[0147] The cap member (300) may be formed from an electrically insulating material. This is to prevent the arc generated in the circuit breaker (20) from advancing. Additionally, the cap member (300) may be formed from a material having a certain elasticity. This allows for elastic deformation and storage of restoring force, and is combined with the end of the bolt member (130) and the nut member (400) so that the combined state is stably maintained.

[0148] In one embodiment, the cap member (300) may be formed of a hard material having a certain elasticity, such as reinforced plastic. In the above embodiment, the cap member (300) may be hook-coupled with the nut member (400).

[0149] The cap member (300) is combined with the bolt member (130). Specifically, the cap member (300) is configured to cover one end of the bolt member (130) in the longitudinal direction that is located in the cradle space (120), i.e., the inner end.

[0150] The cap member (300) is combined with the cover member (200). The cap member (300) is received in the cap receiving space (231) and can be combined with the insertion groove (232) and the buffer space (233), respectively.

[0151] The cap member (300) is combined with the nut member (400). The cap member (300) is combined with the nut member (400) through which one end of the bolt member (130) is joined, so as to cover them from the cradle space (120).

[0152] In the embodiment illustrated in FIGS. 9 to 11, the cap member (300) includes a cap base (310), a cap body (320), a cap projection (330), an incision groove (340), and a nut receiving space (350).

[0153] The cap base (310) forms a part of the outer shape of the cap member (300). The cap base (310) is combined with the bolt member (130) and the nut member (400) to cover them and is exposed to the cradle space (120). That is, the cap base (310) can be defined as the part of the cap member (300) that is exposed to the cradle space (120).

[0154] The cap base (310) is combined with the cap body (320). On one side of the cap base (310), the left side in the illustrated embodiment, the cap body (320) is formed to protrude. The cap body (320) is located radially inward of the outer circumference of the cap base (310) and can extend along the outer circumference of the cap base (310).

[0155] The cap base (310) partially surrounds the nut receiving space (350). In the illustrated embodiment, the cap projection (330) surrounds the nut receiving space (350) from the right side. As will be described later, the other side of the nut receiving space (350), namely the left side, is formed open to accommodate the bolt member (130) and the nut member (400).

[0156] The cap base (310) may be any shape that is combined with other components of the cap member (300) and can cover the bolt member (130) and nut member (400) to separate it from the cradle space (120). In the illustrated embodiment, the cap base (310) is a disc shape having a circular cross-section and a thickness in the left-right direction.

[0157] In the above embodiment, the cross-sectional area of ​​the cap base (310) may be formed to be greater than the cross-sectional area of ​​the cap receiving space (231). That is, the cap base (310) may cover the cap receiving space (231) but may not be received within the cap receiving space (231). Accordingly, the bolt member (130) and nut member (400) received inside the cap receiving space (231) can be protected from arc.

[0158] The cap body (320) is a configuration in which the cap member (300) is coupled to the cap coupling portion (230). The cap body (320) is received in the cap receiving space (231) and the insertion groove (232). The longitudinal end of the cap body (320) may be supported by the inner circumference of the cradle coupling member (220) which surrounds the insertion groove (232) from the outside.

[0159] The cap body (320) is joined to the cap base (310). The cap body (320) is joined to one side of the cap base (310) opposite to the cradle space (120), the right side in the illustrated embodiment. The cap body (320) extends in the thickness direction of the cap base (310), the left-right direction in the illustrated embodiment.

[0160] The cap body (320) is positioned radially inward with respect to the outer circumference of the cap base (310). The cap body (320) extends along the outer circumference direction of the cap base (310).

[0161] An incision groove (340) is formed in the cap body (320). An incision groove (340) is formed in a recess in one end of the cap body (320) in the height direction, in a part of the left end in the illustrated embodiment. As will be described later, as the incision groove (340) is formed, the cap body (320) can be deformed in shape by a predetermined length along the radial direction.

[0162] A cap projection (330) is formed on a part of the cap body (320). A cap projection (330) is formed on a part of the left end in the height direction of the cap body (320) in the illustrated embodiment. The cap projection (330) can support a nut member (400) surrounded by the cap body (320).

[0163] The cap body (320) surrounds the nut receiving space (350). The nut receiving space (350) is formed on the radially inner side of the cap body (320). The cap body (320) surrounds the nut receiving space (350) on the radially outer side and supports the nut member (400) received in the nut receiving space (350) on the radially outer side.

[0164] The cap body (320) is received in the cap receiving space (231). The outer circumference of the cap body (320) received in the cap receiving space (231) may be supported by the inner circumference of a cradle coupling member (220) that surrounds the cap receiving space (231) radially from the outside. To this end, the cap body (320) may have a shape corresponding to the shape of the cap receiving space (231).

[0165] As described above, the cap receiving space (231) is formed as a space having a hexagonal cross-section. Accordingly, in the illustrated embodiment, the cap body (320) has a hexagonal outer circumference cross-section and is a three-dimensional shape having a height in the left-right direction. The portion of the cross-section of the cap body (320) corresponding to the hexagonal side can be positioned to face the portion of the inner circumference of the cradle coupling member (220) corresponding to the hexagonal side.

[0166] At the same time, the longitudinal end of the cap body (320), the left end in the illustrated embodiment, can be received in the insertion groove (232).

[0167] At this time, a cap projection (330) may be formed protrudingly on a portion of the end corresponding to the side of the hexagon in the longitudinal direction of the cap body (320). Additionally, an incision groove (340) may be formed in a recessed portion corresponding to the vertex of the hexagon in the longitudinal direction of the cap body (320).

[0168] The cap projection (330) is a configuration in which the cap member (300) supports the nut member (400). The cap projection (330) supports the nut member (400) received in the nut receiving space (350) radially outwardly, on one side in the height direction, and in the illustrated embodiment, the left end. Additionally, the cap projection (330) can be received in the insertion groove (232).

[0169] A cap projection (330) is formed on the cap body (320). Specifically, the cap projection (330) is formed on the longitudinal end of the cap body (320), the left end in the illustrated embodiment. The cap projection (330) is formed protruding from the said end of the cap body (320).

[0170] Multiple cap protrusions (330) may be formed. Multiple cap protrusions (330) may be formed on different parts of the end portion of the cap body (320). In the illustrated embodiment, three cap protrusions (330) are formed. The three cap protrusions (330) are formed on the end portion of the cap body (320) corresponding to the side of the hexagon.

[0171] At this time, three cap protrusions (330) may be formed alternately along the outer circumference of the cap body (320). That is, among the six ends of the cap body (320), the ends where the cap protrusions (330) are formed and the ends where they are not formed may be formed alternately along the outer circumference of the cap body (320).

[0172] In the illustrated embodiment, the cap projection (330) includes a restraining projection (331).

[0173] The restraining projection (331) supports the nut member (400) received in the nut receiving space (350) from the radially outward side. The cap projection (330) surrounds one end of the nut member (400) in the height direction from the radially outward side. The restraining projection (331) is formed to protrude radially inward from the end of the cap projection (330). As the restraining projection (331) is formed, the nut member (400) received in the nut receiving space (350) may not be dislodged along its length direction.

[0174] As described above, the cap protrusions (330) may be formed alternately along the extension direction of the cap body (320). Accordingly, it will be understood that the restraining protrusions (331) are also formed alternately along the extension direction of the cap body (320).

[0175] The cut groove (340) provides a clearance space for the cap body (320) to be elastically deformed along the radial direction for a predetermined length. The cut groove (340) is formed as a recess at the longitudinal end of the cap body (320), in the illustrated embodiment, at the left end. The cut groove (340) may be formed in a portion of the cap body (320) corresponding to a vertex of a hexagon. The cut groove (340) is positioned to overlap with the buffer space (233).

[0176] Multiple incision grooves (340) may be formed. Multiple incision grooves (340) may be spaced apart along the outer circumference of the cap body (320). In the illustrated embodiment, the incision grooves (340) are formed at each of the six parts corresponding to the vertices of the hexagon, so that a total of six are provided.

[0177] Therefore, it will be understood that some of the incision grooves (340) of a pair adjacent to each other are positioned facing each other with the cap projection (330) in between.

[0178] The incision groove (340) may be in communication with the buffer space (233). The incision groove (340) may be positioned to overlap with the buffer space (233) along its recessed direction, that is, the left-right direction in the illustrated embodiment.

[0179] The nut receiving space (350) is a space formed inside the cap member (300). The nut receiving space (350) accommodates the nut member (400). The nut receiving space (350) is defined by being surrounded by the cap base (310) and the cap body (320). Specifically, one side of the cap base (310) in its height direction, i.e., the right side in the illustrated embodiment, is surrounded by the cap base (310). The outer side of the cap base (310) in its radial direction is surrounded by the cap body (320). The other side of the cap base (310) in its height direction, the left side in the illustrated embodiment, is formed open and communicates with the cap receiving space (231).

[0180] The nut receiving space (350) may have a shape corresponding to the shape of the cap body (320). In the illustrated embodiment, the nut receiving space (350) is formed as a space with a three-dimensional shape having a hexagonal cross-section and a height in the left-right direction. The shape of the nut receiving space (350) may be changed to correspond to the shape of the nut member (400).

[0181] The nut receiving space (350) may be connected to the outside by the other side in the height direction, the left side in the illustrated embodiment. The nut member (400) may be received in the nut receiving space (350) through the other side.

[0182] The nut member (400) is combined with the bolt member (130) and serves to combine the cradle wall (110) and the cover member (200). The nut member (400) is combined with the cap member (300) and covered so that it is not exposed to the cradle space (120).

[0183] The nut member (400) is joined to the bolt member (130). Specifically, the nut member (400) is joined to one end of the bolt member (130) in the longitudinal direction, that is, the end located in the cradle space (120).

[0184] The nut member (400) is combined with the cap member (300). Specifically, the nut member (400) is received in the nut receiving space (350), and one side in the height direction, i.e., the right side, is supported by the cap base (310), and the radially outer side is supported by the cap body (320).

[0185] The nut member (400) may have a shape corresponding to the shape of the cap body (320). In the illustrated embodiment, the nut member (400) has a hexagonal cross-section and is a three-dimensional shape with height in the left-right direction. A hollow through which a bolt member (130) is coupled may be formed inside the nut member (400). The hollow may be positioned to align with the through hole formed in the cradle wall (110) and the cradle through hole (234).

[0186]

[0187] Referring to FIGS. 12 to 16, the combined state of the cover member (200), the cap member (300), and the nut member (400) is illustrated as an example. For convenience of explanation, the illustration of the cradle body (100) has been omitted.

[0188] In the illustrated embodiment, the cap member (300) is coupled to the cap coupling portion (230) while coupled with the nut member (400). In this state, the outer circumference of the nut member (400) is supported by the cap body (320) and the restraining projection (331) formed at the end of the cap body (320), and one side in the longitudinal direction is supported by the cap base (310), and the other side in the longitudinal direction is supported by the inner circumference of the cradle coupling member (220).

[0189] In the above state, the nut member (400) can be prevented from rotating arbitrarily by the cap body (320) and the cap projection (330).

[0190] Additionally, the cap body (320) and the cap projection (330) are received in the cap receiving space (231) and the insertion groove (232) while combined with the nut member (400). By the shape of the cap body (320) and the shape of the inner circumference of the cradle coupling member (220), arbitrary rotation of the cap body (320) can also be prevented.

[0191] In the above state, the portion of the outer circumference of the cap body (320) corresponding to the hexagonal side may be positioned to face the portion of the inner circumference of the cradle coupling member (220) corresponding to the hexagonal side. Additionally, the cut groove (340) may be positioned to align with the buffer space (233).

[0192]

[0193] Referring to FIGS. 17 to 19, a combined state of a cradle body (100), a cover member (200), a cap member (300), and a nut member (400) provided in the cradle (10) of the present invention is illustrated as an example.

[0194] In the illustrated embodiment, the ends of the nut member (400) and the bolt member (130) coupled thereto are covered by the cap base (310) and are not exposed to the cradle space (120). Accordingly, even if an arc occurs in the air breaker (20) housed in the cradle space (120), the nut member (400) and the bolt member (130) may not be damaged by the arc.

[0195] Additionally, the cap member (300) is combined with the cap coupling part (230) so that only the cap base (310) is exposed to the cradle space (120), thereby minimizing the size of the space occupied by the cap member (300) in the cradle space (120).

[0196] At this time, the bolt member (130) can first be screw-coupled with the nut member (400) received in the cap receiving space (231), and then the cap member (300) can be coupled with the cover member (200) and the nut member (400). As described above, in an embodiment in which the cap member (300) is formed of a hard material having a certain elasticity, the cap member (300) can be hook-coupled with the nut member (400) by means of a restraining projection (331).

[0197] Accordingly, the cap member (300) can be easily and firmly connected to the nut member (400) and the cradle body (100) and cover member (200) connected thereto. The connected state of the cradle body (100), cover member (200), cap member (300), and nut member (400) can be stably maintained.

[0198]

[0199] Although embodiments of the present invention have been described, the spirit of the present invention is not limited to the embodiments presented in this specification. Those skilled in the art who understand the spirit of the present invention may easily propose other embodiments within the scope of the same spirit by adding, changing, deleting, or adding components, and such embodiments shall also be considered to fall within the scope of the spirit of the present invention.

[0200] 10: Cradle 20: Air breaker

[0201] 100: Cradle body 110: Cradle wall

[0202] 120: Cradle space 130: Bolt member

[0203] 200: Cover part 210: Cover body

[0204] 220: Cradle connecting member 230: Cap connecting part

[0205] 231: Cap receiving space 232: Insertion groove

[0206] 233: Buffer space 234: Cradle penetration hole

[0207] 300: Cap Part 310: Cap Base

[0208] 320: Cap body 330: Cap protrusion

[0209] 331: Restraint projection 340: Incision groove

[0210] 350: Nut receiving space 400: Nut member

Claims

1. A cap base formed in the shape of a plate; A cap body coupled to one side of the cap base, having a height in the thickness direction of the cap base, and extending in the direction of the outer circumference of the cap base from the radially inner side of the outer circumference of the cap base; A nut receiving space defined by being enclosed by the above-mentioned cap base and the above-mentioned cap body, and accommodating a nut member; and It includes a cap projection located at the height-direction end of the above-mentioned cap body and protruding radially inward, The above cap projection is configured to be hook-coupled with the outer circumference of the nut member, Cap missing.

2. In Paragraph 1, The above cap base is, The cross-section is formed to have an area larger than the cross-section of the nut member. Cap missing.

3. In Paragraph 1, The above-mentioned cap body is formed of a hard material having a predetermined elasticity and is configured to be shape-deformable toward the radially inward or radially outward side. Cap missing.

4. In Paragraph 3, The above-mentioned cap body has a polygonal shape on its outer circumference, and The above cap projection is formed in a part of the cap body such that its cross-section corresponds to the side of the polygon. Cap missing.

5. In Paragraph 4, The above-mentioned cap body includes a plurality of parts that correspond to the above-mentioned side and are continuous with one another, and The above cap protrusion is formed on one of the adjacent parts among the plurality of parts of the cap body, The ends of the cap body and the cap protrusions are alternately positioned along the plurality of parts of the cap body. Cap missing.

6. In Paragraph 4, A portion of the cap body comprising a cut groove formed by sinking into a portion whose cross-section corresponds to a vertex of the polygon. Cap missing.

7. In Paragraph 6, The above-mentioned cap body includes a plurality of parts that correspond to the above-mentioned side and are continuous with one another, and The above-mentioned incision grooves are formed in each of the consecutive portions of the plurality of portions of the cap body, The end of the cap body or the cap projection and the incision groove are alternately positioned along the plurality of parts of the cap body. Cap missing.

8. A cradle body having an internal cradle space into which a circuit breaker is inserted; A cover member that covers the cradle space and is coupled to the cradle body; A nut member coupled to a bolt member provided in the cradle body; and It includes a cap member that is coupled to the cover member and the nut member and blocks the bolt member and the nut member from the cradle space, The above cover member is, One end of the bolt member is penetrated, and the cap coupling portion is coupled to the nut member and the cap member, and The above cap member is, A cap body coupled to the nut member and coupled to the cap coupling part; and A cap base that is continuous with the cap body and covers the cap coupling portion, the nut member, and the bolt member, Cradle for crane circuit breaker.

9. In Paragraph 8, The cross-sectional area of ​​the above cap base is formed to be greater than or equal to the cross-sectional area of ​​the above cap coupling part, The above cap base completely covers the above cap coupling portion, Cradle for crane circuit breaker.

10. In Paragraph 8, The above cap coupling part is, A cap receiving space formed by recessing on one surface of the cover member facing the cradle space; and A cradle through hole located in the cap receiving space and formed through the cover member through which the bolt member passes, Cradle for crane circuit breaker.

11. In Paragraph 10, The above-mentioned cap receiving space is formed to have a polygonal cross-section, and The outer circumference of the cap body is formed to have a polygonal shape corresponding to the cross-sectional shape of the cap receiving space, and The outer circumference of the nut member is formed to have a polygonal shape corresponding to the shape of the outer circumference of the cap body. Cradle for crane circuit breaker.

12. In Paragraph 8, The above cap coupling part is, It includes an insertion groove formed by a recess on the inner surface opposite to the above-mentioned cradle space, and One end of the cap body opposite to the cradle space is received in the insertion groove. Cradle for crane circuit breaker.

13. In Paragraph 12, The above cap member is, It includes a cap projection located at the height-direction end of the above-mentioned cap body and protruding radially inward, The above cap projection is configured to be hook-coupled with the outer circumference of the nut member, Cradle for crane circuit breaker.

14. In Paragraph 13, The above cap projection is received in the insertion groove, Cradle for crane circuit breaker.

15. In Paragraph 8, The above cap coupling part is, It includes a cap receiving space formed by recessing on one surface of the cover member facing the cradle space, and The above cap base is formed to have a cross-sectional area larger than the cap receiving space, and the cap member covers the cap receiving space and is coupled to the cap coupling part. Cradle for crane circuit breaker.

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