JP6689110B2 - Door for container - Google Patents

Description

  The present invention relates to a container door, and more particularly to a door installed in an opening on a side surface of the container.

  BACKGROUND ART Conventionally, a container having a larger opening has been used in order to facilitate the cargo handling work on the container. As an example of such a container, for example, a so-called wing roof type door is used (see, for example, Patent Document 1), the door that closes the opening is a double door, and the door plate is a folding door. What was done (for example, refer to patent documents 2) is adopted.

JP-A-2007-284073 JP, 2013-035588, A

By the way, in the case of a long container, such as a long container for rail freight (31 ft), if a wing roof type door is adopted, the load on the drive mechanism of the door increases as the size of the door increases. This leads to an increase in the weight of the device and an increase in the maintenance cost. In addition, since an external power supply is indispensable for opening and closing the door, the operation of the container may be limited. On the other hand, if a double door is used, the door plate becomes large and the turning radius becomes large, so that a large space is required on the side of the container when opening and closing the door, which impairs the flexibility of operation. Further, it is considered that the door plate is easily affected by wind when it is opened and closed, which may hinder the opening and closing operation. Furthermore, the moment generated in each door plate increases during opening and closing, and twists are induced in the upper part of each door, the lock mechanism (see the lock cam described later) is not applied when the door is closed, and the first door of the folding door is opened. Before closing the second door plate, the first door plate is deformed under the influence of the moment when the second door plate is closed and locked and then the second door plate is closed. In addition, there is a risk of causing a problem such as unlocking of the first door plate.
The present invention has been made in view of the above problems, and an object of the present invention is to secure a large opening area in a container, to secure a degree of freedom in operation, and to improve usability.

(Aspect of the invention)
The following aspects of the invention exemplify the constitution of the present invention, and are explained separately for each item in order to facilitate understanding of various constitutions of the present invention. Each section does not limit the technical scope of the present invention, while referring to the best mode for carrying out the invention, a part of the constituent elements of each section is replaced, deleted, or further The addition of the constituent elements of (5) is also included in the technical scope of the present invention.

(1) A double door that is installed in an opening on a side surface of a container, and at least one of a pair of door plates that constitutes the double door,
A first door plate, a second door plate rotatably coupled to the first door plate, and a third door plate rotatably coupled to the second door plate Including,
The width of the first door plate is larger than the widths of the second door plate and the third door plate,
The first door plate is rotatably coupled to the container end face side end portion of the opening,
The coupling portion that rotatably couples the first door plate and the second door plate has a state in which the first door plate and the second door plate are folded in parallel, Between the first door plate and the second door plate, a space in which the third door plate is folded between the first door plate and the second door plate in parallel with the door plate is provided. A container door that can be secured .

In the container door described in this section, at least one of a pair of door plates forming a double door that closes the opening on the side surface of the container has a first door plate, a second door plate, and a third door. And a door, and each of these door plates constitutes a folding door rotatably connected to each other. Further, since the first door plate is rotatably coupled to the end portion of the opening on the container end face side, the folding door including the first, second, and third door plates has the first door plate. The door plate is pivotally supported on the container as a starting point, and the third door plate is brought into abutment with a pair of door plates on the other side forming the double-door, thereby closing the opening on the side surface of the container.
In the opening operation of the folding door in this section, first, the third door plate and the second door plate which are farthest from the connecting portion between the first door plate and the container end face side end of the opening are The third door plate is folded to a position in which the third door plate is parallel to the second door plate so that the third door plate is rotated outwardly with respect to the second door plate starting from the connecting portion with the door plate. Subsequently, the second and third door plates are rotated outward with respect to the first door plate, starting from the connecting portion of the first door plate and the second door plate.

  At this time, in the state in which the first door plate and the second door plate are folded in parallel by the connecting portion of the first door plate and the second door plate, the third door plate further includes Since a space for folding the first door plate and the second door plate in parallel with the door plates is ensured between the first door plate and the second door plate, the first and second door plates are secured. , The third door plates are all folded in parallel. In this state, the folding door is moved outward by rotating the first, second, and third door plates outward, starting from the connecting portion of the first door plate and the container end face side end of the opening. Then, the opening on the side surface of the container is completely opened without being partially closed by each door plate. When the first, second, and third door plates are all folded in parallel, the folding door rotates outward from the joint between the first door plate and the container end surface side end of the opening. The radius of gyration at this time is approximately within the width of the first door plate (the width of the first door plate plus the width of the connecting portion).

( 2 ) In the above item (1) , the first door plate extends from an upper corner portion of the second door plate side or its vicinity to a lower corner portion of the container end face side or its vicinity. A door for a container provided with the reinforcing material (claim 1 ).
In the container door described in this section, the first reinforcing member effectively prevents the first door plate, which receives all the weights of the second and third door plates, from being deformed under the influence of the moment. It is to suppress. That is, the moment that the first door plate receives is larger on the second door plate side of the first door plate to which the second and third door plates are connected. Furthermore, the upper side of the first door plate becomes larger. Therefore, in order to effectively reinforce the upward moment of the first door plate on the side of the second door plate, the first reinforcing member is used as the second door of the first door plate. It is arranged so as to reach from the upper corner portion on the plate side or its vicinity to the lower corner portion on the container end face side or its vicinity.

( 3 ) In the above item ( 2 ), the coupling portion includes a first hinge fixed to the first door plate, a second hinge fixed to the second door plate, and the first hinge. And a middle member fixed to both the second hinge and the second hinge.
The container door described in this section has a first hinge fixed to the first door plate and a second hinge, and a connecting portion that swingably connects the first door plate and the second door plate. By comprising a second hinge fixed to the door plate and an intermediate member fixed to both the first hinge and the second hinge, the thickness (width or length) of these components can be adjusted to The first door plate and the second door plate are folded in parallel to each other to secure a necessary distance between them, whereby the third door plate becomes the first door plate and the second door plate. The space between the plates that is folded in parallel with these door plates is ensured between the first door plate and the second door plate.

( 4 ) In the above item ( 3 ), the height and thickness of each door plate are the same , and the intermediate member is a pillar member having the same height and thickness as each door plate ( Claim 3).
The container door described in this section has the same height and thickness of each door plate, and the intermediate member is a pillar member having the same height and thickness as each door plate. When the opening on the side surface of the container is closed, the side surface of the container has a substantially flat shape due to the door plates and the intermediate member. Further, the thickness (width or length) of the intermediate member is defined as a space between the first door plate and the second door plate in which the third door plate is folded in parallel with the first door plate and the first door plate. This contributes to ensuring the space between the second door plate and the second door plate. In addition, in the present description, “ identical ” means not only completely identical, but also including a difference in an allowable range in terms of structure and dimensional accuracy.

(5) In the above items (2) to (4), the first door plate extends from a lower corner portion on the second door plate side or its vicinity to an upper corner portion on the container end face side or its vicinity. And a second reinforcing material, the second reinforcing material is divided at the intersection with the first reinforcing material while avoiding the first reinforcing material (claim 4 ). .
The container door described in this section is provided with the second reinforcing material in addition to the first reinforcing material, thereby making the reinforcement against the moment stronger. That is, from the lower corner portion of the first door plate on the second door plate side or the vicinity thereof to the upper corner portion of the container end face side or its vicinity so as to intersect with the first reinforcing member. , A second reinforcing material. Moreover, when disposing the second reinforcing material, the second reinforcing material does not separate the first reinforcing material at the intersection with the first reinforcing material so that the first reinforcing material is not divided. By avoiding the division, it is possible to prevent the strength of the first reinforcing material from being impaired, which is more effective in preventing the deformation due to the moment.

  Since the present invention is configured in this way, it is possible to secure a large opening area in the container, secure the degree of freedom in operation, and improve usability.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically the container door based on embodiment of this invention, (a) is the figure which looked at the side surface of a container from the front, (b) is the AA sectional view of (a), ( (c) is a BB sectional view of (a). The door plate which comprises the door for containers shown in FIG. 1 is partially extracted, (a) is a front view, (b) is CC sectional drawing of (a), (c) is a rear view. is there. 1 is an excerpt of a pillar member constituting the container door shown in FIG. 1, where (a) is a top view, (b) is a front view, (c) is a back view, and (d) is D of (a). -D sectional view, (e) is a top view of (f), (f) is an enlarged view of an E portion of (a), and (g) is a FF sectional view of (f). FIG. 1B is an enlarged view showing a state in which the second door plate and the third door plate are opened and folded in parallel with the first door plate in FIG. 1B. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically the container provided with the container door based on embodiment of this invention, (a) is the figure which looked at the container side surface from the front, (b) is the GG cross section of (a), Explanatory drawing which shows the opening procedure of the container door, (c) is the figure which looked at the container side surface which concerns on a reference example, (d) is the HH cross section of (c), and is a description which shows the opening procedure of a container door. It is a figure. It is an application example of the container door according to the embodiment of the present invention, (a) is a front view of the first door plate, (b) is a rear view.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Here, parts that are the same as or equivalent to those of the related art are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 1, the container door 10 according to the embodiment of the present invention is installed in the opening 1a on the side surface of the container 1, and is a so-called double door. The pair of door plates constituting the container door 10 include a first door plate 101, a second door plate 102 rotatably coupled to the first door plate 101, and a second door. The third door plate 103 is rotatably connected to the plate. As shown in FIG. 2, the first door plate 101 has a frame 101b formed by bending a steel plate fixed to a peripheral portion of a side plate 101a made of a steel plate, and a vertical beam 101c formed by bending the structure, A plurality of upper and lower frame bodies 101b are arranged in parallel with the left and right frame bodies 101b and fixed to the side plate 101a and the upper and lower frame bodies 101b. The shapes and installation locations of the frame body 101b and the vertical beam 101c are determined in consideration of the strength required for the first door plate 101.

The door plates 101, 102, 103 have the same height and thickness. On the other hand, although the width of each door body (width in the left-right direction in FIG. 1A) is different, the structure of the second door plate 102 and the third door plate 103 is basically the same as that of the first door. Since it is similar to the plate 101, detailed description is omitted. In the illustrated example, the width of the first door plate 101 is larger than that of the second door plate 102. Further, the width of the second door plate 102 is configured to be larger than the width of the third door plate 103.
The first door plate 101 is rotatably coupled to the end of the opening 1a of the container 1 on the container end face 1b side via a hinge 12. The first door plate 101 and the second door plate 102 are rotatably coupled to each other via a coupling portion 104 described later. The second door plate 102 and the third door plate 103 are rotatably coupled via a hinge 12.

As shown in FIG. 3, the coupling portion 104 includes a first hinge 104b fixed to the first door plate, a second hinge 104c fixed to the second door plate 104c, and a first hinge. And an intermediate member 104a fixed to both the second hinge 104c and the second hinge 104c. The intermediate member 104a has the same height and thickness as the door plates 101, 102, 103, and is a hollow pillar member by bending a steel plate into a channel shape and welding them face to face. Is configured. The first hinge 104b has a general hinge concept in which the first plate 104b1 and the second plate 104b2 are pivotally attached by a shaft 104b3.

  The first hinge 104b, the second hinge 104c, and the hinge 12 have the same basic structure, but their dimensions and allowable load values are optimized. In the illustrated example, four hinges 12 are used to connect the first door plate 101 to the end of the opening 1a of the container 1 on the container end face 1b side. Further, two hinges 12 that connect the second door plate 102 and the third door plate 103 are used. Further, the first hinge 104b and the second hinge 104c of the coupling portion 104 are each used in four numbers. The number of each of these hinges is appropriately set in consideration of the load carried by each hinge.

Further, although detailed description is omitted, the door plates 101, 102, 103 are rotatably attached to the door plates 101, 102, 103, and the rotation phase around the axis is changed, so that the door plates 101, 102, 103 are closed. A lock rod 16 (see FIG. 1) for locking / unlocking is provided. In the illustrated example, two lock rods 16 are provided on each of the door plates 101, 102, 103.
And in this Embodiment, a pair of door boards which comprise the door 10 for containers is a folding door containing the 1st door board 101, the 2nd door board 102, the 3rd door board 103, and the connection part 104. In the opening 1a on the side surface of the container 1, a pair is provided symmetrically with respect to the center of the opening 1a in the longitudinal direction (left-right direction in FIG. 1A).

FIG. 4 shows a state in which a part of the container door 10 according to the embodiment of the present invention is folded.
As shown in the figure, in a state in which the first door plate 101 and the second door plate 102 are folded in parallel, the third door plate 103 further includes the first door plate 101 and the second door plate 102. A space A that is folded in parallel with the door plates 101 and 102 is secured between the first door plate 101 and the second door plate 102.

By the way, according to the embodiment of the present invention having the above-mentioned configuration, the following operational effects can be obtained.
That is, the pair of door plates 10 forming a double door that closes the opening 1 a on the side surface of the container 1 includes a first door plate 101, a second door plate 102, and a third door plate 103. The door plates 101, 102, 103 are rotatably coupled to each other to form a folding door. Further, since the first door plate 101 is rotatably coupled to the end portion of the opening 1a on the container end face 1b side, the folding door including each door plate starts from the first door plate 101. Is pivotally supported with respect to the container 1 so that the third door plate 103 is brought into abutment with the pair of third door plates 103 on the other side forming the double door, and the opening 1a on the side surface of the container 1 is opened. It's a close thing.

  Then, in the opening operation of the folding door, first, as shown in (S2) from the closed state shown in (S1) of FIG. 5 (b), first, the first door plate 101 and the wife of the container 1 of the opening 1a are opened. With respect to the second door plate 102, the third door plate 103 farthest from the connecting part with the end on the side of the surface 1b is used as a starting point from the connecting part of the third door plate 103 and the second door plate 102. Then, the third door plate 103 is folded to a position in which the third door plate 103 is parallel to the second door plate 012. Subsequently, the second door plate 102, the third door plate 103, and the first door plate 101 are started with a connecting part 104 that is a connecting part of the first door plate 101 and the second door plate 102 as a starting point. Rotate outwards against.

  At this time, in the state in which the first door plate 101 and the second door plate 102 are folded in parallel by the connecting portion 104 that connects the first door plate 101 and the second door plate 102, A space A (see FIG. 4) in which the third door plate 103 is folded between the first door plate 101 and the second door plate 102 in parallel with these door plates is the first door plate 101 and the second door plate 102. Is secured between the door plate 102 and the door plate 102. Therefore, as shown in (S3), the first door plate 101, the second door plate 102, and the third door plate 103 are all folded in parallel. In this state, as shown in (S4), the first door plate 101, the second door plate 101, the second door plate 101, the second door plate 101, the second door plate 101, the second door plate 101, By rotating the door plate 102 and the third door plate 103 of the outer side, the folding door is rotated outward, and the opening 1a on the side surface of the container 1 is partially closed by the respective door plates 101, 102, 103. All are released without breaking.

Moreover, since the first door plate 101, the second door plate 102, and the third door plate 103 are all folded in parallel, the folding door is the end part of the first door plate 101 and the opening 1a on the container end face 1b side. The radius of gyration when rotating outward from the joint with is approximately equal to the width of the first door plate (the width of the first door plate 101 plus the width indispensable for the rotation of the hinge 12). It will fit. The radius of gyration when the third door plate 103 rotates with respect to the second door plate 102 is approximately the width of the third door plate 103 (the width of the third door plate 103 is equal to the rotation of the hinge 12). The radius of gyration when the second and third door plates 102 and 103 rotate with respect to the first door plate 101 is approximately the width of the second door 102 plate (inclusive of the indispensable width). The width of the second door plate 102 plus the width indispensable for the rotation of the coupling portion 104).
Therefore, in each rotation operation, the space required to the side of the container 1 may be determined by considering the radius of gyration of the first door plate 101 having the widest width, thereby increasing the degree of freedom in operating the container 1. .

  Then, the first hinge plate 104b fixed to the first door plate 101 and the second door plate 102 are provided with a connecting portion 104 that swingably connects the first door plate 101 and the second door plate 102. The second hinge 104c fixed to the second hinge 104c and the intermediate member 104a fixed to both the first hinge 104b and the second hinge 104c are used to adjust the thickness (width or length) of these components. In the state where the first door plate 101 and the second door plate 102 are folded in parallel with each other, it is possible to secure a necessary distance between them. As a result, the space A (see FIG. 4) in which the third door plate 103 is folded between the first door plate 101 and the second door plate 102 in parallel with these door plates is the first door plate 101. And the second door plate 102 can be secured.

The first door plate 101, the second door plate 102, and the third door plate 103 have the same height and thickness, and the intermediate member 104 has the same height and thickness as the door plates 101, 102, 103. Since the pillar members are the same , the side surface of the container 1 has a side surface of the container 1 in a state where the opening 1a on the side surface of the container 1 is closed by the door boards 101, 102, 103. The intermediate member 104 provides a substantially flat aspect. Further, the thickness of the intermediate member 104a contributes to ensuring the space A between the first door plate 101 and the second door plate 102.

  5 (c) and 5 (d), as a reference example, a container door 10 'including only a first door plate 101', a second door plate 102 ', and a third door plate 103' is shown. Has been done. The opening operation of the folding door of the container door 10 'of the reference example is almost the same as (S1) to (S4) of FIG. 5 (b), and is shown in (S1') to (S4 ') of FIG. 5 (d). Shows.

Although detailed description is omitted, since the container door 10 ′ coupling portion 104 of the reference example is not provided, the third door plate 103 ′ is between the first door plate 101 ′ and the second door plate 102 ′. In addition, it is not possible to secure a space A that can be folded in parallel with these door plates. Therefore, the first door plate 101 ′, the second door plate 102 ′, and the third door plate 103 ′ form a triangle in a plan view, and the moment generated in each door plate increases when each door rotates. Although there is a degree of difference from the above-mentioned conventional technique, twisting may be induced in the upper part of each door, and smoothness of engagement of the lock cam (not shown) of the lock rod 16 when the door is closed may be impaired to some extent. . Also, when the first door plate 101 ′ is closed and locked, and then the second door plate 102 ′ is closed, the first door plate 101 ′ is deformed under the influence of the moment, There is concern that the lock cam of the lock rod 16 of the first door plate 101 ′ may come off before the closing of the second door plate 102 ′ is completed. Further, when the container 1 is mounted on a trailer for road transportation, as shown in FIG. 5D (S4 ′), the first door plate 101 and the end face 1b of the container 1 of the opening 1a are formed. When the first door plate 101, the second door plate 102, and the third door plate 103 are rotated outward from the connecting portion with the side end portion, they interfere with the driver's seat of the tractor towing the trailer. The rotation angle will also be limited.
According to the embodiment of the present invention, such inconveniences are eliminated, and the opening / closing work and the locking operation of the container door 10 can be smoothly performed.

In addition, in the embodiment of the present invention, the pair of door plates that configure the double-door double door 10 are rotatably coupled to the first door plate 101 and the first door plate 101. The second door plate 102, the third door plate 103 that is rotatably connected to the second door plate, and the connecting portion 104 have been described as an example, but the length of the container, etc. In consideration of the above, only one of the double doors may have the above configuration.
In addition, in the present embodiment, the coupling portion 104 includes the first hinge 104b fixed to the first door plate 101, the second hinge 104c fixed to the second door plate 102, and the first hinge 104c. Although the intermediate member 104a is fixed to both the hinge 104b and the second hinge 104c, a hinge having a large turning radius and having the same function may be used.

Now, FIG. 6 shows an application example of the container door 10 according to the embodiment of the invention shown in FIGS. 1 and 2. The container door according to the application example of FIG. 6 is obtained by modifying the structure of the first door plate 101 shown in FIGS. 1 and 2.
The first door plate shown in FIG. 6 is an excerpt of the one used as the left first door plate shown in FIG. 1, but the first right door plate shown in FIG. It has a symmetrical structure with the example of FIG. Further, the components other than the first door plate 201 are the same as those in the example shown in FIG.

  Specifically, the first door plate 201 shown in FIG. 6 has a side plate 201a made of a steel plate, and a frame 201b formed by bending a steel plate is fixed to the peripheral portion of the side plate 201a. It is similar to the first door plate 101 shown. However, instead of the vertical beam 101c formed by bending the structure, the upper corner of the second door plate 102 side or the vicinity thereof, that is, the upper right corner of FIG. 6A (upper left corner of FIG. 6B) faces each other. The first reinforcing member 22 is provided to reach the lower corner of the container end face side or the vicinity thereof, that is, the lower left portion of FIG. 6A (the lower right portion of FIG. 6B). The first reinforcing member 22 is formed by bending a structure, and is fixed to the side plate 201a, and both ends in the longitudinal direction are fixed to the frame body 201b. Further, in the illustrated example, the first reinforcing member 22 is parallel to the first reinforcing member 221 that connects the vicinity of the upper corner portion on the second door plate 102 side and the vicinity of the lower corner portion on the container end face side. And two first reinforcing members 222 and 223. The installation intervals of these first reinforcing members 221, 222, 223 may be the same or different as shown in the drawing. Further, the installation mode and the number of the first reinforcing members 22 are appropriately set in consideration of the load carried by the first reinforcing members 22 and the weight increase due to the installation thereof. Is.

  Further, in the example of FIG. 6, from the lower corner of the first door plate 201 on the second door plate 102 side or in the vicinity thereof, that is, from the lower right of FIG. 6A (lower left of FIG. 6B). The second reinforcing member is provided to reach the upper corner of the opposing container end face or the vicinity thereof, that is, the upper left of FIG. 6A (the upper right of FIG. 6B). Then, the second reinforcing member 24 is divided at the intersection Cr with the first reinforcing member 22 while avoiding the first reinforcing member 22. The second reinforcing member 24 is also formed by bending the structure, and is fixed to the side plate 201a, and both ends in the longitudinal direction are fixed to the frame body 201b. Further, at the intersection Cr with the first reinforcing material, it is fixed to the first reinforcing material 22. In the illustrated example, the second reinforcing member 24 is also parallel to the first reinforcing member 241 that connects the vicinity of the lower corner portion on the second door plate 102 side and the vicinity of the upper corner portion on the container end face side. Two first reinforcing members 242 and 243 are provided. The installation intervals of these second reinforcing members 241, 242, 243 may be the same or different as shown in the drawing. The installation mode and the number of the second reinforcing members 24 are also appropriately set in consideration of the load carried by the second reinforcing members 24 and the weight increase due to the installation of these members.

  Then, according to the example of FIG. 6, the first door plate 201 that receives all the weights of the second door plate 102, the third door plate 103, the coupling portion 104, and the like is deformed by the influence of the moment. This can be effectively suppressed by the first reinforcing member 22. That is, the moment that the first door plate 201 receives is larger on the second door plate 102 side of the first door plate 201 to which the second and third door plates 102 and 103 are connected. Furthermore, the upper side of the first door plate 201 becomes larger. Therefore, in order to effectively reinforce the upward moment of the first door plate 201 on the side of the second door plate 102, the first reinforcing member 22 is attached to the first door plate 201. The second door plate 102 is arranged so as to extend from an upper corner portion on the side of the second door plate 102 or its vicinity to a lower corner portion on the side of the opposing container end face or its vicinity.

Further, by providing the second reinforcing material 24 together with the first reinforcing material 22, it becomes possible to strengthen the reinforcement against the moment. That is, from the lower corner portion of the first door plate 201 on the second door plate 102 side or the vicinity thereof so as to intersect with the first reinforcing member 22, the upper corner portion of the opposing container end face side or its vicinity. The second reinforcing member 24 is provided so as to reach the vicinity. Moreover, when disposing the second reinforcing material 24, the second reinforcing material 24 is arranged at the intersection Cr with the first reinforcing material 22 so that the first reinforcing material 22 is not divided. It is divided so as to avoid the first reinforcing member 22. This makes it possible to prevent the strength of the first reinforcing member 22 from being impaired, which is more effective in preventing deformation due to the moment.
Other details of the same effects as the example of FIG. 1 are omitted.

  1: Container, 10: Door for container, 101, 201: First door plate, 102: Second door plate, 103: Third door plate, 104: Joining part, Intermediate member 104a, First hinge 104b , Second hinge 104c, 12: hinge, 22, 222, 222, 223: first reinforcing material, 24, 241, 242, 243: second reinforcing material, Cr: intersection part

Claims (4)

A double door that is installed in the opening on the side surface of the container, and at least one of a pair of door plates that forms the double door,
A first door plate, a second door plate rotatably coupled to the first door plate, and a third door plate rotatably coupled to the second door plate Including,
The width of the first door plate is larger than the widths of the second door plate and the third door plate,
The first door plate is rotatably coupled to the container end face side end of the opening,
The coupling portion that rotatably couples the first door plate and the second door plate has a state in which the first door plate and the second door plate are folded in parallel, A space, in which the third door plate is folded in parallel between the first door plate and the second door plate, is defined between the first door plate and the second door plate. The first door plate is provided with a first reinforcing member extending from the upper corner portion on the second door plate side or the vicinity thereof to the lower corner portion on the container end face side or the vicinity thereof. A container door that is equipped with . The coupling portion includes a first hinge fixed to the first door plate, a second hinge fixed to the second door plate, both the first hinge and the second hinge. The container door according to claim 1, wherein the container door is fixed to the intermediate member. The container door according to claim 2, wherein the door plates have the same height and the same thickness, and the intermediate member is a pillar member having the same height and the same thickness as the door plates. The first door plate includes a second reinforcing member that extends from a lower corner portion on the second door plate side or its vicinity to an upper corner portion on the container end face side or its vicinity.
The container according to any one of claims 1 to 3, wherein the second reinforcing material is divided at an intersection with the first reinforcing material so as to avoid the first reinforcing material. Door.

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