Door opening / closing structure and maintenance method for door opening / closing structure

Abstract

To provide a door opening / closing structure that allows easy maintenance of a door, and a maintenance method for the door opening / closing structure.SOLUTION: A notch 51 for inserting a tool is formed at a boundary 50 between a first hinge portion 11 and a second hinge portion 12. Therefore, during maintenance, a worker can insert a tool into the notch 51. By operating the tool in this state, the worker can easily lift a door via the upper first hinge portion 11 using the principle of leverage. This makes it possible to adjust the height of the doors 3A, 3B by attaching a spacer 13 or the like to the boundary between the first hinge portion 11 and the second hinge portion 12. This operation requires less force than simply lifting the doors 3A, 3B, so it can be easily performed by a single worker.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a door opening / closing structure and a maintenance method for the door opening / closing structure. [Background technology]

[0002] Conventionally, electrical equipment storage boxes such as cubicles have been known (for example, see Patent Document 1). This electrical equipment storage box has a door on the front side that can be opened and closed in a double door style. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-303237 Summary of the Invention [Problem to be solved by the invention]

[0004] Because electrical equipment storage boxes, especially cubicle doors, are large and heavy, even a slight deviation in the flatness of the installation site (foundation) can distort the body of the door, causing it to sag. In this case, the height of the left and right doors can become misaligned, making it difficult to open and close. If leveling the foundation does not improve the situation, the door height can be adjusted by inserting a spacer such as a washer between the door hinge and the hinge on the body of the door. However, because the door is heavy, this adjustment requires at least two people. Furthermore, the work involves removing the hinge pins and, depending on the degree of distortion, repeatedly checking the door height. This results in a labor-intensive maintenance process.

[0005] An object of the present invention is to provide a door opening / closing structure that allows door maintenance to be easily performed, and a maintenance method for the door opening / closing structure. [Means for solving the problem]

[0006] The door opening / closing structure of the present invention is a door opening / closing structure for a door of an electrical equipment storage box, and comprises an axis portion extending in the vertical direction, a first hinge portion into which the upper end side of the axis portion is inserted and which is connected to the door of the electrical equipment storage box, and a second hinge portion into which the lower end side of the axis portion is inserted and which is connected to the main body portion of the electrical equipment storage box, and a cutout portion is formed at the boundary between the first hinge portion and the second hinge portion for inserting a tool.

[0007] The door opening / closing structure according to the present invention includes a first hinge into which the upper end of the shaft is inserted and which is connected to the door of the electrical equipment storage box, and a second hinge into which the lower end of the shaft is inserted and which is connected to the main body of the electrical equipment storage box. Therefore, the door can be opened and closed by rotating relative to the main body around the shaft via the first hinge and the second hinge. A notch for inserting a tool is formed at the boundary between the first hinge and the second hinge. Therefore, during maintenance, a worker can insert the tool into the notch. By operating the tool in this state, the worker can easily lift the door via the upper first hinge using the principle of leverage. This allows the height of the door to be adjusted by attaching a spacer or the like to the boundary between the first hinge and the second hinge. This operation requires less force than simply lifting the door, so it can be easily performed by a single worker. This facilitates door maintenance.

[0008] A notch may be formed in at least one of the first hinge portion and the second hinge portion at the boundary. In this case, the fulcrum of the lever principle of the tool can be set at the outer edge of the flange of the shaft. In this case, the distance from the contact point of the tip of the tool with the first hinge portion to the fulcrum can be increased. Therefore, it is possible to lift the door with a small force.

[0009] The shaft may have a flange interposed between the first hinge and the second hinge at the boundary. In this case, the flange of the shaft can maintain the first hinge and the second hinge apart without using a separate spacer. Furthermore, when inserting a spacer between the first hinge and the second hinge, the flange can be used together with the shaft as a guide.

[0010] The flange may have a notch formed therein. In this case, it is not necessary to perform processing to form a notch in the first hinge or other door-side component. In other words, if a special component having a flange with a notch as an axis is prepared, the door opening and closing structure according to the present invention can be applied to existing electrical equipment storage boxes.

[0011] The door opening and closing mechanism may further include a spacer that is a separate member from the shaft and is interposed between the first hinge portion and the second hinge portion at the boundary. By interposing the spacer after lifting the first hinge portion with a tool, the height of the door can be adjusted.

[0012] The spacer may be provided with a handle extending outward from the outer periphery, allowing an operator to easily operate the spacer by grasping the handle.

[0013] The maintenance method for a door opening / closing structure according to the present invention is a maintenance method for a door opening / closing structure for a door of an electrical equipment storage box, the door opening / closing structure comprising an axis extending in the vertical direction, a first hinge portion into which the upper end of the axis is inserted and connected to the door of the electrical equipment storage box, and a second hinge portion into which the lower end of the axis is inserted and connected to the main body of the electrical equipment storage box, a notch is formed at the boundary between the first hinge portion and the second hinge portion, a tool is inserted into the notch and the first hinge portion is pushed up with the tool, and with the first hinge portion pushed up, a spacer is interposed between the first hinge portion and the second hinge portion at the boundary.

[0014] According to the maintenance method for a door opening / closing structure of the present invention, a tool is inserted into the notch, the first hinge is pushed up with the tool, and a spacer is interposed between the first hinge and the second hinge at the boundary while the first hinge is pushed up. When the worker pushes up the first hinge with the tool, the worker can easily lift the door via the upper first hinge using the principle of leverage. This allows the door height to be adjusted by attaching a spacer or the like to the boundary between the first hinge and the second hinge. This operation requires less force than lifting the door directly, so it can be easily performed by a single worker. As described above, door maintenance can be easily performed. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a door opening / closing structure that allows easy maintenance of a door, and a maintenance method for the door opening / closing structure. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing an electrical equipment storage box in which a door opening and closing structure according to an embodiment of the present invention is employed; [Figure 2] FIG. 2 is a perspective view showing the state of the door opening and closing structure before maintenance. [Figure 3] FIG. 10 is a perspective view showing the state of the door opening and closing structure after maintenance. [Figure 4] Fig. 4(a) is an exploded view of the components of the opening / closing structure after maintenance, and Fig. 4(b) is an enlarged perspective view of the first hinge portion as seen from below. [Figure 5] 10 is a schematic cross-sectional view for explaining how the first hinge portion is pushed up by a tool. FIG. [Figure 6] FIG. 10 is a perspective view illustrating the procedure of a maintenance method. [Figure 7] FIG. 10 is a perspective view illustrating the procedure of a maintenance method. [Figure 8] FIG. 10 is a perspective view illustrating the procedure of a maintenance method. [Figure 9] FIG. 10 is a plan view for explaining the behavior of a spacer. [Figure 10] FIG. 10 is a perspective view showing a door opening and closing structure before maintenance according to a modified example. [Figure 11] FIG. 10 is a perspective view showing a door opening and closing structure after maintenance according to a modified example. [Figure 12] Fig. 12(a) is an exploded view of the components of the opening / closing structure after maintenance, and Fig. 12(b) is an enlarged perspective view of the flange. [Figure 13] FIG. 10 is a perspective view illustrating the procedure of a maintenance method. [Figure 14] FIG. 10 is a perspective view showing a door opening and closing structure after maintenance according to a modified example. [Figure 15] FIG. 10 is a perspective view illustrating the procedure of a maintenance method. [Figure 16] FIG. 10 is a perspective view illustrating the procedure of a maintenance method. [Figure 17] FIG. 10 is a plan view for explaining the behavior of a spacer. [Figure 18] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and redundant description will be omitted.

[0018] 1 is a perspective view showing an electrical equipment storage box 1 in which a door opening and closing structure 100 according to an embodiment of the present invention is employed. In the following description, the terms "upper," "lower," "front," "rear," "right," and "left" are used based on the position when facing the doors 3A and 3B of the electrical equipment storage box 1.

[0019] The electrical equipment storage box 1 is a box known as a cubicle, and houses power-receiving equipment that converts electricity sent from a power plant to 100V or 200V. The electrical equipment storage box 1 includes a main body 2 and doors 3A and 3B. The main body 2 is a rectangular box-shaped member. The main body 2 has an opening 4 on its front side. The doors 3A and 3B are members that open and close the opening 4 of the main body 2. The door 3A is pivotally connected to a front end 2a of the right side wall of the main body 2. The door 3B is pivotally connected to a front end 2b of the left side wall of the main body 2. As a result, the doors 3A and 3B have a double-door structure that allows the opening 4 to be opened and closed. The door 3A is connected to the front end 2b via door opening / closing mechanisms 100 provided at multiple locations (two locations in this case) in the vertical direction. The door 3B is connected to the front end portion 2b via door opening / closing structures 100 provided at multiple locations (two locations in this example) in the vertical direction.

[0020] Next, the door opening / closing structure 100 will be described in detail with reference to FIGS. 2 to 4. In the following description, a state in which the right door 3A is rotated 90 degrees forward from a closed state to an open state will be described. Two door opening / closing structures 100 are provided for the right door 3A, and since both have the same structure, only one of the door opening / closing structures 100 will be described. The door opening / closing structure 100 for the left door 3B also has the same structure. FIG. 2 is a perspective view showing the state of the door opening / closing structure 100 before maintenance. FIG. 3 is a perspective view showing the state of the door opening / closing structure 100 after maintenance. FIG. 4(a) is an exploded view of the components of the door opening / closing structure 100 after maintenance. FIG. 4(b) is an enlarged perspective view of the first hinge portion 11 as viewed from below.

[0021] As shown in Fig. 2, the door opening and closing structure 100 before maintenance includes a shaft portion 10, a first hinge portion 11, and a second hinge portion 12. As shown in Fig. 3 and Fig. 4(a), the door opening and closing structure 100 after maintenance further includes a spacer 13.

[0022] As shown in Figure 4(a), the shaft 10 is a cylindrical member extending in the vertical direction. The shaft 10 supports the hinges 11 and 12 and serves as the axis of rotation when the door 3A rotates relative to the main body 2. The shaft 10 has a flange 16 at the center in the vertical direction. The flange 16 is a disk-shaped member that protrudes outward.

[0023] The first hinge portion 11 is a member into which the upper end of the shaft portion 10 is inserted and which is connected to the door 3A of the electrical equipment storage box 1. The first hinge portion 11 includes a cylindrical main body portion 21 and a flat connecting portion 22. The main body portion 21 is a member into which an area of ​​the shaft portion 10 above the flange portion 16 is inserted. The main body portion 21 has a through-hole 23 penetrating vertically at its center. The connecting portion 22 is a flat portion extending in a predetermined tangential direction from the outer circumferential surface of the main body portion 21. The door 3A has a bent portion 3a bent at a right angle at an edge (see FIG. 2). The first hinge portion 11 is connected to the door 3A by fixing the connecting portion 22 to the bent portion 3a.

[0024] The second hinge 12 is a member into which the lower end of the shaft 10 is inserted and which is connected to the main body 2 of the electrical equipment storage box 1. The second hinge 12 includes a cylindrical main body 24 and a flat connecting portion 26. The main body 24 is a member into which a region of the shaft 10 lower than the flange 16 is inserted. The main body 24 has a through-hole 27 penetrating vertically at its center. The connecting portion 26 is a flat portion extending tangentially from the outer circumferential surface of the main body 24. The connecting portion 26 is bent in an L-shape. The main body 2 has a drip edge 30 at its front end 2a, which has a constant cross-sectional shape and extends vertically. The drip edge 30 has a wall 30a extending in the front-rear direction and a wall 30b bent to the right at the front end of the wall 30a (see FIG. 2). The second hinge portion 12 is connected to the main body portion 2 by fixing the L-shaped connecting portion 26 to the L-shaped wall portions 30a, 30b of the drip tray 30.

[0025] The spacer 13 is a member that adjusts the height of the first hinge portion 11 during maintenance. The spacer 13 is a flat plate-shaped member that is placed on the flange portion 16 of the shaft portion 10. The spacer 13 is configured as a separate member from the shaft portion 10. The spacer 13 has a through portion 31 through which the shaft portion 10 is inserted in the vertical direction. The spacer 13 has a handle portion 32 that protrudes toward the outer periphery. The through portion 31 opens in a direction perpendicular to the protruding direction of the handle portion 32.

[0026] When the above-described components are assembled, the upper first hinge portion 11 and the second hinge portion 12 are arranged to face each other in the vertical direction, as shown in FIGS. 2 and 3 . The region near the boundary between the first hinge portion 11 and the second hinge portion 12 is referred to as a boundary portion 50. The boundary portion 50 is a region including the lower end portion of the first hinge portion 11 and the upper end portion of the second hinge portion 12. At the boundary portion 50, the flange portion 16 is arranged to be interposed between the first hinge portion 11 and the second hinge portion 12. Before maintenance, as shown in FIG. 2 , the lower surface of the flange portion 16 rests on the upper end portion of the second hinge portion 12. The lower end portion of the first hinge portion 11 rests on the upper surface of the flange portion 16. After maintenance, as shown in FIG. 3 , the spacer 13 is interposed between the first hinge portion 11 and the second hinge portion 12 at the boundary portion 50. The lower surface of the flange portion 16 is placed on the upper end portion of the second hinge portion 12. The lower surface of the spacer 13 is placed on the upper surface of the flange portion 16. The lower surface of the first hinge portion 11 is placed on the upper surface of the spacer 13.

[0027] A notch 51 for inserting a tool is formed at a boundary 50 between the first hinge portion 11 and the second hinge portion 12. In this embodiment, the notch 51 is formed in the first hinge portion 11 at the boundary 50. Specifically, as shown in FIG. 4(b), the notch 51 is formed in the lower end surface of the main body portion 21 of the first hinge portion 11, recessed upward from the lower end surface. The notch 51 is formed from the through hole 23 to the outer peripheral surface 21a of the main body portion 21. The notch 51 is formed in a fan shape within an arbitrary angular range with respect to the central axis of the through hole 23 in the vertical direction. As a result, the notch 51 is located at a position that opens forward when the door 3B is opened 90° (as shown in FIGS. 2 and 3). The angular range of the notch 51 is not particularly limited, as long as it is large enough to allow the insertion of a tool 55, such as a flathead screwdriver (see FIG. 6).

[0028] With this configuration, as shown in FIG. 5(a), a space SP is formed between the notch 51 and the upper surface of the flange 16 at the boundary 50. The space SP opens forward at the outer peripheral surface 21a. Therefore, an operator can insert a tool 55, such as a flathead screwdriver, into the space SP of the notch 51 from the front (see also FIG. 6). As a result, as shown in FIG. 5(b), when an operator lowers the handle on the rear end side of the tool 55, the tool 55 pushes up the first hinge portion 11 by lever action, with the vicinity of the outer peripheral edge of the flange 16 as a fulcrum (see also FIG. 7).

[0029] Next, a maintenance method for the door opening / closing structure 100 for the door of the electrical equipment storage box 1 will be described. Such maintenance is performed, for example, when the main body 2 is distorted, causing the doors 3A and 3B to drop, resulting in a misalignment in the height of the left and right doors 3A and 3B, making opening and closing difficult. First, the work starts from the state shown in FIG. 2. Next, as shown in FIG. 6, the worker inserts the tip of the tool 55 into the notch 51. This positions the tip of the tool 55 within the space SP of the notch 51 (see FIG. 5(a)). Next, as shown in FIG. 7, the worker lowers the handle 56 of the tool 55, thereby pushing the first hinge 11 upward along the shaft 10 by lever action. This forms a space SP between the lower surface of the main body 21 of the first hinge 11 and the upper surface of the flange 16 (see FIG. 5(b)).

[0030] Next, as shown in FIG. 8, the worker places the spacer 13 between the first hinge portion 11 and the flange portion 16. At this time, as shown in FIGS. 8 and 9, the worker holds the spacer 13 with the handle portion 32 of the spacer 13 extending to the left, and inserts the spacer 13 from the opening side of the through-hole 31 into the space SP (see FIG. 5(b)) between the first hinge portion 11 and the flange portion 16. At this time, the worker may move the spacer 13 rearward so that the through-hole 31 of the spacer is aligned with the tip of the tool 55. Finally, the worker pushes in the spacer 13. As a result, as shown in FIG. 3, the spacer 13 is placed between the first hinge portion 11 and the flange portion 16, and the maintenance work is completed. In this state, the first hinge portion 11 and the door 3A are positioned higher by the amount of the spacer 13 than before maintenance.

[0031] Next, the operation and effects of the door opening and closing structure 100 according to this embodiment and the maintenance method thereof will be described.

[0032] The door opening and closing structure 100 according to this embodiment includes a first hinge 11 into which the upper end of the shaft 10 is inserted and which is connected to the doors 3A and 3B of the electrical equipment storage box 1, and a second hinge 12 into which the lower end of the shaft 10 is inserted and which is connected to the main body 2 of the electrical equipment storage box 1. Therefore, the doors 3A and 3B can be opened and closed by rotating with respect to the main body 2 around the shaft 10 via the first hinge 11 and the second hinge 12. A notch 51 for inserting a tool is formed at a boundary 50 between the first hinge 11 and the second hinge 12. Therefore, during maintenance, a worker can insert the tool into the notch 51. By operating the tool in this state, the worker can easily lift the door via the upper first hinge 11 by utilizing the principle of leverage. This allows the height of the doors 3A, 3B to be adjusted by attaching a spacer 13 or the like to the boundary between the first hinge portion 11 and the second hinge portion 12. This type of work requires less force than simply lifting the doors 3A, 3B, so it can be easily done by a single worker. As a result, maintenance of the doors 3A, 3B can be easily performed.

[0033] At the boundary 50, a notch 51 may be formed in at least one of the first hinge portion 11 and the second hinge portion 12. In this case, the fulcrum of the leverage principle of the tool 55 can be set at the outer edge of the flange portion 16 of the shaft portion 10. In this case, the distance from the contact point between the tip of the tool 55 and the first hinge portion 11 to the fulcrum can be made larger (compared to when the fulcrum is the lower second hinge portion 12 as shown in FIG. 13). Therefore, it is possible to lift the doors 3A, 3B with a small force.

[0034] The shaft 10 may have a flange 16 interposed between the first hinge 11 and the second hinge 12 at the boundary 50. In this case, the flange 16 of the shaft 10 can maintain the first hinge 11 and the second hinge 12 spaced apart without the need for a separate spacer. Furthermore, when inserting a spacer between the first hinge 11 and the second hinge 12, the flange 16 can be used together with the shaft 10 as a guide or the like.

[0035] The door opening and closing structure 100 may further include a spacer 13, which is a separate member from the shaft portion 10, interposed between the first hinge portion 11 and the second hinge portion 12 at the boundary portion 50. After the first hinge portion 11 is lifted with a tool 55, the height of the doors 3A, 3B can be adjusted by interposing the spacer 13.

[0036] The spacer 13 may be provided with a handle portion 32 extending outward from the outer periphery thereof, so that an operator can easily operate the spacer 13 by grasping the handle portion 32.

[0037] According to the maintenance method for the door opening / closing mechanism 100 of this embodiment, a tool 55 is inserted into the notch 51, the first hinge portion 11 is pushed up using the tool 55, and a spacer 13 is interposed between the first hinge portion 11 and the second hinge portion 12 at the boundary portion 50 while the first hinge portion 11 is in the raised state. When the worker pushes up the first hinge portion 11 with the tool 55, the worker can easily lift the doors 3A and 3B via the upper first hinge portion 11 using the principle of leverage. This allows the height of the doors 3A and 3B to be adjusted by attaching a spacer 13 or the like to the boundary portion 50 between the first hinge portion 11 and the second hinge portion 12. This operation requires less force than simply lifting the doors, and can be easily performed by a single worker. As described above, maintenance of the doors 3A and 3B can be easily performed.

[0038] The present invention is not limited to the above-described embodiment. For example, the door opening / closing structure 100 shown in FIGS. 10 and 11 may be employed. In the door opening / closing structure 100 according to the modified example shown in FIGS. 10 and 11, a notch 151 is formed in the flange 16 at the boundary 50. In this case, it is not necessary to perform processing to form a notch in the first hinge 11 or the like, which is a member on the door 3A, 3B side. In other words, if a special member having a flange 16 with a notch 151 is prepared as the shaft 10, the door opening / closing structure 100 according to this embodiment can be applied to an existing electrical equipment storage box 1.

[0039] Specifically, as shown in FIG. 12(b), the upper first hinge portion 11 does not have a notch 51 at its lower end. Instead, the flange portion 16 has a notch 151. The notch 151 is formed in the front region of the flange portion 16, penetrating from the top surface to the bottom surface and opening to the front. The width of the notch 151 in the left-right direction may be large enough to allow the tip of a tool 55 to be inserted therein (see FIG. 13). As shown in FIG. 13, during maintenance, the worker inserts the tip of the tool 55 into the notch 151. The worker lowers the handle portion 56 of the tool 55. As a result, the tip of the tool 55 pushes up the lower end of the first hinge portion 11 using the principle of leverage, with the outer peripheral edge of the upper surface 24a of the main body portion 24 of the lower second hinge portion 12 as a fulcrum.

[0040] As shown in FIG. 14 , a slit 35 may be formed in the wall 30b of the draining section 30 to allow the handle portion 32 of the spacer 13 to pass through. In this case, the length of the handle portion 32 can be increased. The opening direction of the through-hole 31 of the spacer 13 is not particularly limited, and as shown in FIG. 17 , the opening may be toward the opposite side of the handle portion 32. In this case, as shown in FIG. 15 , the operator can insert the spacer 13 with the handle portion 32 positioned on the opposite side of the notch 51. Since the insertion direction of the spacer 13 and the handle portion 32 are parallel, the operator can place the handle portion 32 on the tool and does not need to support the handle portion 32 with his or her hand. This makes it easier for the operator to insert the spacer 13 into the notch 51. After inserting the spacer 13 into the notch 51, the operator rotates the handle portion 32 toward the wall 30b as shown in FIG. 16 and stores the handle portion 32 in the slit 35 as shown in FIG. 14 . At this time, the worker rotates the spacer 13 when pushing it in, thereby making it difficult to remove.

[0041] 18, a through hole 39 may be formed in the handle portion 32. In this case, the operator can easily hold the handle portion 32. As with the spacer 13 shown in FIG. 17, the insertion direction of the spacer 13 and the handle portion 32 are parallel, so the operator can place the handle portion 32 on the tool and does not need to support the handle portion 32 with his or her hand. Furthermore, the handle portion 32 has a hollow structure, so it can be bent. Therefore, when the operator pushes in the spacer 13, he or she can bend the handle portion 32 and push it in.

[0042] It is also possible to adopt a shaft portion 10 that does not have a flange portion 16. In this case, too, a tool 55 can be inserted into the notch portion 51 to utilize the principle of leverage at the upper end portion of the second hinge portion 12. Also, a notch may be provided in the second hinge portion 12 on the lower side. [Explanation of symbols]

[0043] 1...electrical equipment storage box, 2...main body, 3...door, 10...axis, 11...first hinge, 12...second hinge, 16...flange, 13...spacer, 32...handle, 50...boundary, 51, 151...cutout, 100...door opening and closing structure.

Claims

1. A door opening and closing structure for an electrical equipment storage box, a shaft portion extending in the vertical direction; a first hinge portion into which an upper end side of the shaft portion is inserted and which is connected to a door of the electrical equipment storage box; a second hinge portion into which a lower end side of the shaft portion is inserted and which is connected to a main body portion of the electrical equipment storage box, A door opening and closing structure, wherein a notch for inserting a tool is formed at the boundary between the first hinge portion and the second hinge portion.

2. The door opening and closing structure according to claim 1 , wherein the notch is formed in at least one of the first hinge portion and the second hinge portion at the boundary portion.

3. The door opening and closing structure according to claim 1 , wherein the shaft portion has a flange portion interposed between the first hinge portion and the second hinge portion at the boundary portion.

4. The door opening and closing structure according to claim 3 , wherein the flange portion is formed with the notch portion.

5. The door opening and closing structure according to claim 1 , further comprising a spacer that is a separate member from the shaft portion and is interposed between the first hinge portion and the second hinge portion at the boundary portion.

6. The door opening and closing structure according to claim 5 , wherein the spacer is provided with a handle portion extending outwardly.

7. A maintenance method for a door opening / closing structure of an electrical equipment storage box, comprising: The door opening and closing structure includes: a shaft portion extending in the vertical direction; a first hinge portion into which an upper end side of the shaft portion is inserted and which is connected to the door of the electrical equipment storage box; a second hinge portion into which a lower end side of the shaft portion is inserted and which is connected to a main body portion of the electrical equipment storage box, a notch is formed at a boundary between the first hinge portion and the second hinge portion; inserting a tool into the notch and pushing up the first hinge portion with the tool; A maintenance method for a door opening and closing structure, comprising: interposing a spacer between the first hinge portion and the second hinge portion at the boundary portion while the first hinge portion is pushed up.

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