Installation structure of breaker mounting member

Abstract

To provide an installation structure of a breaker mounting member which can be installed on a base member without screwing the breaker mounting member, and can be easily installed without the need to incline the breaker mounting member when installed on the base member.SOLUTION: On the surface of the base mounting part 11 of the crossover base 2, engaging pieces 13A and 13B which are cut and raised forward and whose distal ends are bent inward in the left-right direction are provided, and on the upper and lower parts of the branch base 3A and 3B, insertion holes 29 and 25 through which the engaging pieces 13A and 13B can be inserted and engaged parts 30A, 30B, 26A and 26B which protrude from the end edges of the insertion holes 29 and 25 into the insertion holes 29 and 25 are provided, respectively.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an installation structure for a breaker mounting member to which a branch breaker is attached, for example, in a distribution board. [Background technology]

[0002] A conventional structure for installing branch breakers in, for example, a distribution panel includes vertically mounting a plurality of base members between two rail members spaced apart at a predetermined interval in the left-right direction, screwing a breaker mounting member across two adjacent base members, and mounting the branch breakers to the breaker mounting members. Patent Document 1, for example, describes a structure in which a long vertical hole is drilled in the front surface of the base member, and hook-shaped locking projections that are bent outward at the top and bottom protrude rearward on both the top and bottom of the breaker mounting member, allowing the locking projections to lock into the locking holes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 4-120290 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a structure in which the breaker mounting member is screwed to the base member, the number of parts naturally increases with the number of screws, which causes problems such as complication of installation work and costly parts management. On the other hand, in the structure described in Patent Document 1, for example, it is necessary to insert the upper locking protrusion into the locking hole while tilting the breaker mounting member relative to the fixed upper base member, adjust the position of the lower base member to match the vertical length of the breaker mounting member, bring the lower side of the breaker mounting member close to the lower base member and insert the lower locking protrusion into the locking hole, and then slide the lower base member closer to the upper base member before fixing it, which causes problems such as complication of installation work of the breaker mounting member.

[0005] Furthermore, if the breaker mounting member described in Patent Document 1 is to be used in a structure that uses a base member without a locking hole, i.e., a structure that is screwed to the base member, it cannot be used as is. However, this can be addressed by providing screw holes in the breaker mounting member. However, when the breaker mounting member is screwed, it will protrude forward by the height of the locking protrusion. Therefore, the branch breaker attached to the breaker mounting member may interfere with a door, etc., which can be said to pose a problem in terms of versatility.

[0006] Therefore, the present invention has been made in consideration of the above problems, and aims to provide an installation structure for a breaker mounting member that allows the breaker mounting member to be installed on a base member without screwing, and that can be easily installed without the need to tilt the breaker mounting member when installing it on the base member. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a breaker mounting member installation structure in which a plurality of base members extending in the left-right direction are installed in the vertical direction between two rail members extending in the vertical direction, and a breaker mounting member having a plurality of breaker mounting portions to which breakers can be attached is installed so as to straddle two vertically adjacent base members, and the front surface of the base member is provided with an engagement piece that is cut out and bent forward and has a tip that is bent to either the left or the right, and the top and bottom of the breaker mounting member are provided with insertion holes through which the engagement piece can be inserted, and an insertion hole that extends in the vertical direction from the edge of the insertion hole and an engaged portion that protrudes into the insertion hole, and the engaging piece of the upper base member is inserted into the insertion hole on the upper side of the breaker mounting member, and the engaging piece of the lower base member is inserted into the insertion hole on the lower side of the breaker mounting member, and then either the upper or lower base member is slid vertically toward the other base member, so that the engaged portion moves in behind the tip of the engaging piece and the base of the engaging piece abuts against the edge of the insertion hole, thereby installing the breaker mounting member on the base member. [Effects of the Invention]

[0008] According to this invention, an engaging piece is provided on the front surface of the base member, the engaging piece being cut out and bent forward with its tip bent to either the left or the right, while the top and bottom of the breaker mounting member are provided with insertion holes through which the engaging piece can be inserted and engaged portions that protrude vertically from the edges of the insertion holes into the insertion holes. Then, with the engaging piece of the upper base member inserted into the insertion hole on the top side of the breaker mounting member and the engaging piece of the lower base member inserted into the insertion hole on the bottom side of the breaker mounting member, sliding one of the upper or lower base members vertically toward the other base member causes the engaged portions to move in behind the tips of the engaging pieces and the bases of the engaging pieces to abut against the edges of the insertion holes, thereby installing the breaker mounting member on the base members. Therefore, since the breaker mounting member can be installed on the base member without screwing, not only does this have the effect of simplifying the installation work and reducing the cost of managing parts, but it also has the effect of making it easier to install the breaker mounting member on the base member than before, because there is no need to tilt the breaker mounting member when inserting the engaging piece into the insertion hole. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 10 is an explanatory diagram showing the branch base installed on the crossover base from the front. [Figure 2] FIG. 2 is an explanatory diagram showing an enlarged view of an area A in FIG. [Figure 3] FIG. 10 is an explanatory perspective view showing the branch base installed on the transition base from the front. [Figure 4] FIG. 10 is an explanatory diagram showing the transition base from the front. [Figure 5] FIG. 10 is an explanatory diagram showing the connecting base from above. [Figure 6] FIG. 10 is an explanatory diagram showing the branch base from the front. [Figure 7] FIG. 10 is an explanatory diagram showing the branch base from above. [Figure 8] FIG. 10 is an explanatory diagram showing the branch base from the rear. [Figure 9]FIG. 10 is an explanatory diagram showing the state in which the branch base is temporarily installed on the crossing base. [Figure 10] 10 is an explanatory diagram showing an enlarged view of region B in FIG. 9. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a structure for installing a branch base on a transition base according to one embodiment of the present invention will be described in detail with reference to the drawings.

[0011] FIG. 1 is an explanatory diagram showing, from the front, the state in which branch bases 3A and 3B are installed on the transition bases 2 and 2·. FIG. 2 is an explanatory diagram showing an enlarged view of area A in FIG. 1. FIG. 3 is a perspective explanatory diagram showing, from the front, the state in which branch bases 3A and 3B are installed on the transition bases 2 and 2·. FIG. 4 is an explanatory diagram showing the transition base 2 from the front. FIG. 5 is an explanatory diagram showing the transition base 2 from above. FIG. 6 is an explanatory diagram showing the branch base 3A from the front. FIG. 7 is an explanatory diagram showing the branch base 3A from above. FIG. 8 is an explanatory diagram showing the branch base 3A from the rear. FIG. 9 is an explanatory diagram showing the branch bases 3A, 3A temporarily installed on the transition bases 2 and 2. FIG. 10 is an explanatory diagram showing an enlarged view of area B in FIG. 9.

[0012] Two rail members 1, 1 formed into pillar shapes extending vertically are installed on the back panel of a cabinet of a distribution board (not shown) at a predetermined distance in the left-right direction. In addition, a transition base 2 formed into a strip shape extending horizontally is installed to connect the rail members 1, 1. A plurality of transition bases 2 are installed vertically. Furthermore, branch bases 3A, 3B are installed so as to straddle two adjacent transition bases 2, 2 vertically, and branch breakers (not shown) can be attached to the branch bases 3A, 3B.

[0013] First, the crossing base 2 will be described. The transition base 2 is formed by bending a metal plate and includes a base mounting portion 11 for mounting the branch bases 3A and 3B and screw fastening portions 12, 12 for fixing the transition base 2 to the rail member 1. The base mounting portion 11 is formed in a strip-like shape that is long in the left-right direction. The surface of the base mounting portion 11 is provided with a total of four sets of engagement portions 13, each set consisting of two engagement pieces 13A, 13B arranged side by side on the left and right, in two vertical rows and two horizontal rows. Each of the engagement pieces 13A, 13B is cut and raised forward from the base mounting portion 11, and the tip is bent inward in the left-right direction. That is, the tip of the engagement pieces 13A, 13B of the engagement portion 13 located on the left side of the mounting portion 11 is bent to the right, while the tip of the engagement pieces 13A, 13B of the engagement portion 13 located on the right side is bent to the left. Circular marks 15, 15 are provided at adjacent locations on the inside of each engaging piece 13A in the left-right direction. Meanwhile, the screw fastening portions 12, 12 are provided on both the left and right sides of the base mounting portion 11 and have legs extending rearward from the base mounting portion 11 and bases formed by bending the rear ends of the legs outward in the left-right direction. Each base is provided with a first round screw fastening hole 14A and a second elongated screw fastening hole 14B that is long in the vertical direction.

[0014] Next, we will explain branch bases 3A and 3B. The only difference between branch base 3A and branch base 3B is their vertical length, and here we will explain branch base 3A, which has a shorter vertical length. Furthermore, branch base 3A on the left side is a mirror image of branch base 3A on the right side, and the same is true for branch base 3B. The branch base 3A is made by bending a long, strip-shaped metal plate in the vertical direction, and has a base body 22 on which a plurality of breaker mounting portions 21, 21... are arranged in parallel in the vertical direction, inner mounting pieces 23A, 23B provided on the inside in the left-right direction of the base body 22, and outer mounting pieces 24A, 24B provided on the outside in the left-right direction of the base body 22. The breaker mounting portions 21 consist of notches or hook holes etc. that can hook hook pieces provided on the bottom surface of the branch breaker.

[0015] The inner mounting pieces 23A, 23B are bent rearward from the inner side edges in the left-right direction of the base body 22 and then folded back toward the rear side of the base body 22. The inner mounting pieces 23A, 23B are provided with insertion holes 25 through which the engaging pieces 13B can be inserted. The upper inner mounting piece 23A is provided with an engaged portion 26A that protrudes upward from the lower edge of the insertion hole 25 toward the inside of the insertion hole 25. The lower inner mounting piece 23B is provided with an engaged portion 26B that protrudes downward from the upper edge of the insertion hole 25 toward the inside of the insertion hole 25. Furthermore, a downwardly cut-out accommodating portion 32 is provided in the insertion hole 25 of the inner mounting piece 23A at a location adjacent to the outer side of the engaged portion 26A in the left-right direction. As described below, when the engaged portion 26A enters the rear side of the engaging piece 13B, the base of the engaging piece 13B enters the accommodating portion 32. A similar accommodating portion 32 is also provided in the insertion hole 25 of the inner mounting piece 23B at a location adjacent to the outer side in the left-right direction of the engaged portion 26B, so that when the engaged portion 26B enters the rear side of the engaging piece 13B, the base of the engaging piece 13B enters into the accommodating portion 32. Note that 27 is a fixing hole used when screwing the branch base 3B to a general metal plate base rather than to the crossing base 2, and the fixing hole 27 is exposed in a notch 28 provided in the base body 22.

[0016] Meanwhile, the outer mounting pieces 24A, 24B are bent rearward from the outer side edges in the left-right direction of the base body 22 and then further bent outward. The outer mounting pieces 24A, 24B are provided with insertion holes 29 through which the engaging pieces 13A can be inserted. The upper outer mounting piece 24A is provided with an engaged portion 30A that protrudes upward from the lower edge of the insertion hole 29 toward the inside of the insertion hole 29. The lower outer mounting piece 24B is provided with an engaged portion 30B that protrudes downward from the upper edge of the insertion hole 29 toward the inside of the insertion hole 29. The insertion hole 29 of the outer mounting piece 24A is provided with a downwardly cut-out accommodating portion 33 at a location adjacent to the engaged portion 30A on the outside in the left-right direction. As described below, when the engaged portion 30A enters the rear side of the engaging piece 13A, the base of the engaging piece 13A enters the accommodating portion 33. In addition, a similar accommodating portion 33 is provided at a location adjacent to the outside of the engaged portion 30B in the left-right direction in the insertion hole 29 of the outer mounting piece 24B, so that when the engaged portion 30B enters the rear side of the engaging piece 13A, the base of the engaging piece 13A enters into the accommodating portion 33.

[0017] Furthermore, windows 31 are formed in the outer mounting pieces 24A, 24B at positions inside the insertion holes 29 in the left-right direction, allowing the marks 15 to be exposed when the branch base 3A is properly attached to the crossing base 2. Furthermore, the outer mounting pieces 24A, 24B are also formed with fixing holes 27 identical to those formed in the inner mounting pieces 23A, 23B. The outer mounting pieces 24A, 24B and the inner mounting pieces 23A, 23B are located on the same plane. The left-right distance between the insertion holes 29 in the outer mounting pieces 24A, 24B and the insertion holes 25 in the inner mounting pieces 23A, 23B is the same as the left-right distance between the engagement pieces 13A, 13B of the engagement portion 13.

[0018] Here, the installation work of the branch bases 3A and 3B will be described with reference to Figures 1, 2, 9, and 10. In this embodiment, three transition bases 2, 2... are installed, and two each of the branch bases 3A and 3B are installed. First, the upper transition base 2 is fixed to the rail members 1, 1 by screwing it using the screw holes 14A, 14A. Next, the middle transition base 2 is temporarily fixed downward from the upper transition base 2 at a distance corresponding to the vertical length of the branch bases 3B, 3B. When temporarily fixing it, the transition base 2 is loosely screwed using the screw holes 14B, 14B, so that the transition base 2 can slide over the vertical length of the screw holes 14B, 14B.

[0019] Next, the branch bases 3B, 3B are arranged and temporarily installed so as to straddle the upper and middle transition bases 2. That is, in the left branch base 3B, whose outer mounting pieces 24A, 24B are on the left side, the upper left engagement pieces 13A, 13B of the upper transition base 2 are inserted into the insertion hole 29 of the upper outer mounting piece 24A and the insertion hole 25 of the inner mounting piece 23A. Also, the upper left engagement pieces 13A, 13B of the middle transition base 2 are inserted into the insertion hole 29 of the lower outer mounting piece 24B and the insertion hole 25 of the inner mounting piece 23B. Meanwhile, in the right branch base 3B, whose outer mounting pieces 24A, 24B are on the right side, the upper right engagement pieces 13A, 13B of the upper transition base 2 are inserted into the insertion hole 29 of the upper outer mounting piece 24A and the insertion hole 25 of the inner mounting piece 23A. Additionally, the upper right engaging pieces 13A, 13B of the middle transition base 2 are inserted into the insertion hole 29 of the lower outer mounting piece 24B and the insertion hole 25 of the inner mounting piece 23B.

[0020] As described above, after the corresponding engaging pieces 13A, 13B are inserted into the insertion holes 29, 25, the middle transition base 2 is slid upward (i.e., toward the upper transition base 2). Then, the engaged portions 30A, 30B, 26A, 26B provided to protrude into the insertion holes 29, 25 enter the rear sides of the corresponding engaging pieces 13A, 13B, and the engaging pieces 13A, 13B and the engaged portions 30A, 30B, 26A, 26B engage with each other, preventing the branch bases 3B, 3B from moving forward, i.e., preventing them from falling off the transition bases 2, 2. Furthermore, as the middle transition base 2 slides upward, the bases of the engagement pieces 13A, 13B on the upper transition base 2 enter the accommodation sections 33, 32 and abut against the lower edges of the insertion holes 29, 25, and the bases of the engagement pieces 13A, 13B on the middle transition base 2 also enter the accommodation sections 33, 32 and abut against the upper edges of the insertion holes 29, 25, restricting further upward sliding of the transition base 2 and vertical movement of the branch bases 3B, 3B. Therefore, if the middle transition base 2 is fixed to the rail members 1, 1 with screws while remaining in the slid position, the installation of the branch bases 3B, 3B on the transition bases 2, 2 is completed (FIG. 9).

[0021] Next, the lower transition base 2 is temporarily fixed downward from the middle transition base 2 at a distance corresponding to the vertical length of the branch bases 3A, 3A. When temporarily fixing this, the screw holes 14B, 14B are used to loosely fasten the transition base 2 so that it can slide vertically over the length of the screw holes 14B, 14B.

[0022] Further, branch bases 3A, 3A are arranged and temporarily installed so as to straddle the middle transition base 2 and the lower transition base 2. That is, in the left branch base 3A, in which the outer mounting pieces 24A, 24B are on the left side, the lower left engagement pieces 13A, 13B of the middle transition base 2 are inserted into the insertion hole 29 of the upper outer mounting piece 24A and the insertion hole 25 of the inner mounting piece 23A. In addition, the lower left engagement pieces 13A, 13B of the lower transition base 2 are inserted into the insertion hole 29 of the lower outer mounting piece 24B and the insertion hole 25 of the inner mounting piece 23B. Meanwhile, in the right branch base 3B, in which the outer mounting pieces 24A, 24B are on the right side, the lower right engagement pieces 13A, 13B of the middle transition base 2 are inserted into the insertion hole 29 of the upper outer mounting piece 24A and the insertion hole 25 of the inner mounting piece 23A. Also, the lower right engagement pieces 13A, 13B of the lower transition base 2 are inserted through the insertion hole 29 of the lower outer mounting piece 24B and the insertion hole 25 of the lower inner mounting piece 23B (FIG. 9).

[0023] Then, by sliding the lower transition base 2 upward (i.e., toward the middle transition base 2), the engaged portions 30A, 30B, 26A, 26B enter the rear side of the corresponding engaging pieces 13A, 13B, and the engaging pieces 13A, 13B engage with the engaged portions 30A, 30B, 26A, 26B, preventing the branch bases 3A, 3A from moving forward, i.e., from falling off the transition bases 2, 2. Furthermore, as the lower transition base 2 slides upward, the bases of the engagement pieces 13A, 13B of the middle transition base 2 enter the accommodation sections 33, 32 and abut against the lower edges of the insertion holes 29, 25, and the bases of the engagement pieces 13A, 13B of the lower transition base 2 also enter the accommodation sections 33, 32 and abut against the upper edges of the insertion holes 29, 25, restricting further upward sliding of the transition base 2 and vertical movement of the branch bases 3A, 3A. Therefore, if the lower transition base 2 is fixed to the rail members 1, 1 with screws (the screw holes 14A, 14A may be used for this screw fastening) while remaining in the slid position, the installation of the branch bases 3A, 3A on the transition bases 2, 2 is completed (FIG. 1).

[0024] When installing branch bases 3A, 3B as described above, when engagement pieces 13A, 13B corresponding to each insertion hole 29, 25 are simply inserted, i.e., before transition base 2 is slid upward, only a portion of mark 15 is exposed within window 31 (FIG. 10). When transition base 2 is slid upward from this state and engagement portions 13, 13... are engaged with inner mounting pieces 23A, 23B and outer mounting pieces 24A, 24B, mark 15 is entirely exposed within window 31 (FIG. 2). Therefore, the worker can determine whether branch bases 3A, 3B are properly installed based on the state of exposure of mark 15 within window 31.

[0025] According to the installation structure of the branch bases 3A, 3B having the above-mentioned configuration, engaging pieces 13A, 13B are provided on the surface of the base mounting portion 11 of the transition base 2, which are cut forward and have their tips bent inward in the left-right direction, while the upper and lower parts of the branch bases 3A, 3B are provided with insertion holes 29, 25 through which the engaging pieces 13A, 13B can be inserted, and engaged portions 30A, 30B, 26A, 26B that protrude vertically from the edge of the insertion holes 29, 25 into the insertion holes 29, 25. Then, when the engaging pieces 13A, 13B of the upper transition base 2 are inserted into the insertion holes 29, 25 on the upper side of the branch bases 3A, 3B, and the engaging pieces 13A, 13B of the lower transition base 2 are inserted into the insertion holes 29, 25 on the lower side of the branch bases 3A, 3B, respectively, the lower transition base 2 is slid upward to approach the upper transition base 2, whereby the engaged portions 30A, 30B, 26A, 26B enter the rear side of the tips of the corresponding engaging pieces 13A, 13B, restricting the forward movement of the branch bases 3A, 3B, and the bases of the engaging pieces 13A, 13B abut against the edge of the insertion holes 29, 25, respectively, restricting further sliding of the transition base 2 and further movement of the branch bases 3A, 3B in the vertical direction, allowing the branch bases 3A, 3B to be installed on the transition bases 2, 2. Therefore, the branch bases 3A, 3B can be installed on the transition bases 2, 2 without screwing, which simplifies the installation work of the branch bases 3A, 3B and reduces the management costs of installation-related parts. Furthermore, since there is no need to tilt the branch bases 3A, 3B when inserting the engagement pieces 13A, 13B into the insertion holes 29, 25, the branch bases 3A, 3B can be installed on the transition bases 2, 2 much more easily than before.

[0026] Furthermore, because branch bases 3A and 3B, which only have insertion holes 29, 25 and engaged portions 30A, 30B, 26A, 26B rather than protrusions as an installation structure for transition base 2, are provided with fixing holes 27, 27... that are used when screwing to a general metal plate base rather than transition base 2, they can easily be converted to a general structure in which they are screwed to a base member. Furthermore, because they do not protrude forward from the base member by the height of the protrusions when screwed to the base member, interference between the branch breakers attached to branch bases 3A and 3B and cabinet doors, for example, is unlikely to be an issue, making them highly versatile.

[0027] Furthermore, the transition base 2 has two vertically arranged engagement sections 13, each consisting of a set of two engagement pieces 13A, 13B arranged side by side on the left and right, so that a single transition base 2 can be used to install branch bases 3A, 3B that extend upward from itself, as well as branch bases 3A, 3B that extend downward from itself, resulting in a rational configuration that allows space to be saved within the cabinet.

[0028] Furthermore, because the transition base 2 has two rows of engagement portions 13 in the left-right direction, two branch bases 3A, 3B can be installed in one transition base 2 in the left-right direction, allowing more breakers to be installed in a smaller space, further reducing space within the cabinet. In addition, for the branch bases 3A, 3B installed on such a transition base 2, one of the left and right branch bases 3A, 3B is molded as a mirror image of the other, and the inner mounting pieces 23A, 23B that engage with the inner engagement pieces 13A in the left-right direction are bent rearward from the inner side edge of the base body 22 in the left-right direction and then folded back toward the rear of the base body 22. Therefore, when two branch bases 3A, 3B are installed side by side on the transition base 2, a large space can be secured between the left and right branch bases 3A, 3B that is not required for installation on the transition base 2. This space can be used to easily route wiring to the branch breakers attached to the breaker mounting portions 21.

[0029] In addition, marks 15, 15·· are provided on the transition base 2, and windows 31, 31 are provided on the branch bases 3A, 3B, so that when the transition base 2 is slid upward and the engagement portions 13, 13·· are properly engaged with the inner mounting pieces 23A, 23B and the outer mounting pieces 24A, 24B, the entire mark 15 is exposed within the window 31. Therefore, the worker can accurately and easily determine whether the branch bases 3A, 3B are properly installed based on the state of exposure of the mark 15 within the window 31.

[0030] The installation structure of the breaker mounting member according to the present invention is not limited to the above-described embodiment, and the configuration of the base member, breaker mounting member, etc. can be appropriately modified as needed within the scope of the present invention.

[0031] For example, in the above embodiment, the upper base member is fixed, and the lower base member is slid upward after the breaker mounting member is temporarily installed (inserting the engaging piece into the insertion hole), but there is no problem if the lower base member is fixed and the upper base member is slid downward after the breaker mounting member is temporarily installed.

[0032] The position and number of engaging pieces provided on the base member can also be modified as needed, and there is no problem if three or more engaging pieces form one set of engaging portions, or if only one engaging portion is provided on one base member, etc. In accordance with these design changes, the position and number of insertion holes and engaged portions in the breaker mounting member can also be modified as needed. Furthermore, although the tip of the engagement piece is bent inward in the left-right direction in the above embodiment, it is also possible to form the engagement piece by bending the tip outward in the left-right direction. In addition, a bending structure may be added to the screw fastening portion of the base member to improve strength. [Explanation of symbols]

[0033] 1·· Rail member, 2·· Transition base (base member), 3A, 3B·· Branch base (breaker mounting member), 13·· Engaging portion, 13A, 13B·· Engaging piece, 15·· Mark, 21·· Breaker mounting portion, 23A, 23B·· Inner mounting piece, 24A, 24B·· Outer mounting piece, 25, 29·· Insertion hole, 26A, 26B, 30A, 30B·· Engaged portion, 31·· Window.

Claims

[Claim 1] A breaker mounting member installation structure for installing a plurality of base members extending in the left-right direction between two rail members extending in the up-down direction, and a breaker mounting member having a plurality of breaker mounting portions to which breakers can be mounted, so as to straddle two vertically adjacent base members, An engagement piece is provided on the front surface of the base member, the engagement piece being cut forward and bent to the left or right at its tip. an upper portion and a lower portion of the breaker mounting member are provided with an insertion hole through which the engaging piece can be inserted, and an engaged portion that protrudes vertically from an edge of the insertion hole into the insertion hole; a breaker mounting member having a base member on which the engaging piece is inserted, the base member being inserted through the insertion hole on the upper side of the breaker mounting member, and the base member being inserted through the insertion hole on the lower side of the breaker mounting member; and then either the upper or lower base member being slid vertically toward the other base member, so that the engaged portion enters behind the tip of the engaging piece and the base of the engaging piece abuts against the edge of the insertion hole, thereby installing the breaker mounting member on the base member.

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