Corner post for extension and folding container provided with corner post for extension

Abstract

The utility model relates to a corner post for extension and a folding container provided with the corner post for extension. The corner post for extension is matched with a top hole of a box body corner piece of a lower-layer base body box body to be assembled between an upper-layer laminated box body and the lower-layer base body box body. The corner post for extension comprises a post body and a movable locking shaft body. The top of the column body is connected with an upper layer stacking box body, and a cavity is formed in the column body. The movable locking shaft body comprises a movable block and a locking shaft head arranged on the movable block, and the movable block can move in the cavity in the length direction of the column body. The locking shaft head penetrates to the outer side of the bottom of the column body and is used for stretching into the top hole, and after the locking shaft head stretches into the column body, the column body is rotated, so that the locking shaft head can be clamped into the top hole. And the movable block is driven to move, so that the column body is attached to and locked on the box body corner fitting of the lower-layer base body box body. The assembly between the corner post for extension and the box body is stable and simple, and the universality is very high.

Description

Technical Field

[0001] This application relates to the field of folding container technology, and in particular to an extension corner post and a folding container equipped with the extension corner post. Background Technology

[0002] With the development of container technology, it has been discovered that installing metal corner fittings at the ends of the container can facilitate the assembly of containers. Taking a folding container as an example, the characteristic of a folding container is that it has foldable legs at the ends, and the corner fittings are located at the ends of the legs. The containers are connected and assembled through the top holes of the corner fittings. However, because the width and height of each shipment are inconsistent, sometimes oversized or overweight cargo exceeds the loading limit of a single folding container. This necessitates replacing the container with a larger one or combining folding containers to increase the volume. However, the assembly of folding containers lacks good versatility, and there is a lack of corresponding accessories for expanding the structure of folding containers. Utility Model Content

[0003] Therefore, it is necessary to provide an extension corner post and a folding container equipped with the extension corner post to address the problem of difficulties in expanding container assembly.

[0004] An extension corner post, used for installation between an upper stacked box and a lower base box, wherein its bottom is assembled with the top hole of a corner fitting of the lower base box, comprising:

[0005] The column has a top for connecting to the upper stacked box and an internal cavity.

[0006] The movable locking shaft includes a movable block and a locking shaft head disposed on the movable block. The movable block is disposed in a cavity and can move within the cavity along the length of the column. The locking shaft head extends to the outer side of the bottom of the column.

[0007] The column includes a first state and a second state. In the first state, the locking shaft head extends into the top hole of the corner piece of the housing; in the second state, the locking shaft head is engaged in the top hole of the corner piece of the housing.

[0008] In one embodiment, a locking shaft drive assembly is further included, which includes a drive shaft and a push element movably disposed on the drive shaft; the drive end of the drive shaft extends through the movable block to the outer side of the column sidewall; the drive shaft rotates along its own axis to drive the push element to move along the length of the drive shaft, thereby causing the push element to push the movable block to move.

[0009] In one embodiment, the drive shaft is configured as a screw shaft, which includes a continuous first threaded segment and a second threaded segment, the threads of the first threaded segment and the second threaded segment being opened in opposite directions;

[0010] The pushing element includes a first wedge-shaped pushing block threadedly connected to a first threaded section and a second wedge-shaped pushing block threadedly connected to a second threaded section;

[0011] The first wedge-shaped push block and the second wedge-shaped push block are respectively placed on both sides of the movable block. The side of the first wedge-shaped push block facing the movable block is provided with a first guide slope, and the side of the second wedge-shaped push block facing the movable block is provided with a second guide slope. The first guide slope and the second guide slope are used to guide the movement of the movable block.

[0012] In one embodiment, a lifting hole is provided on the side of the movable block. The lifting hole is the same width as the pushing element, and the length of the lifting hole is greater than the length of the pushing element.

[0013] In one embodiment, a bushing for positioning and installing the positioning end of the drive shaft is provided in the cavity, and the drive shaft can rotate along its own axis inside the bushing; an installation hole is provided on the side wall of the column, and a sealing plate is correspondingly provided in the installation hole, and the bushing is disposed on the sealing plate.

[0014] In one embodiment, the top of the column is provided with an assembly corner piece, and the assembly corner piece has an assembly hole for positioning and connection with the upper stacked box.

[0015] In one embodiment, a base plate is further provided at the bottom of the column. The base plate has a bottom hole along the length of the column. The area of ​​the bottom hole is smaller than the cross-sectional area of ​​the movable block and the cross-sectional area of ​​the locking shaft head. A connecting section is provided between the locking shaft head and the movable block. The cross-sectional area of ​​the connecting section is smaller than the area of ​​the bottom hole. The connecting section moves within the bottom hole. An adapter block is provided on the bottom surface of the base plate. The adapter block is used to fill the gap between the base plate and the opening of the corner piece of the housing.

[0016] In one embodiment, the locking shaft drive assembly further includes a push element guide plate and a movable block guide plate; the push element guide plate is disposed inside the movable block along the length direction of the drive shaft and is used to guide the bottom surface of the push element; the movable block guide plate is disposed inside the cavity and above the movable block and is used to restrict the movement of the movable block along the length and width directions of the column.

[0017] In one embodiment, the cross-section of the locking shaft head is contoured to the cross-section of the top hole of the housing corner piece.

[0018] A folding container includes an upper stacked container and a lower base container, and further includes an extension corner post of any one of the above, the extension corner post being assembled between the upper stacked container and the lower base container.

[0019] The aforementioned extension corner post is used to mate with the top hole of the corner fitting of the lower base box, and is assembled between the upper stacked box and the lower base box. The extension corner post includes a post body and a movable locking shaft. The top of the post body is used to connect to the upper stacked box, and a cavity is provided inside the post body. The movable locking shaft includes a locking shaft head with a movable block disposed on the movable block. The movable block is disposed within the cavity and can move along the length of the post body within the cavity. The locking shaft head extends to the outer side of the bottom of the post body and is used to insert into the top hole of the corner fitting. After the locking shaft head is inserted, rotating the post body allows the locking shaft head to engage at the top hole. By driving the movable block to move along the length of the post body, the post body is locked against the corner fitting of the lower base box. The extension corner post of this application is used to be detachably assembled into the corner fitting holes of the lower base box. By assembling an extension corner post on the lower base box, the accommodation space between the lower base box and the upper stacked box is increased. The assembly between the extension corner post and the box is stable, simple, rigid, and highly versatile.

[0020] A folding container, equipped with the aforementioned extension corner posts, also possesses the aforementioned beneficial effects. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the lower substrate box provided in an embodiment of this application.

[0022] Figure 2 This is a schematic diagram of the assembly of the extension corner post and the lower base box provided in the embodiment of this application.

[0023] Figure 3 This is a schematic diagram of the assembly of the extension corner post between the upper stacked box and the lower base box, as provided in the embodiments of this application.

[0024] Figure 4 This is an exploded view of the assembly of the extension corner post and the box corner fitting provided in the embodiments of this application.

[0025] Figure 5 for Figure 4 An exploded view of the assembly of an embodiment from another perspective.

[0026] Figure 6 This is a cross-sectional view of the locking shaft of the extension corner post provided in the embodiment of this application after it is assembled with the corner piece of the housing in the extended state.

[0027] Figure 7 This is a cross-sectional view of the locking shaft of the extension corner post provided in the embodiment of this application after it is assembled with the corner piece of the housing in the retracted state.

[0028] Figure 8 for Figure 7A cross-sectional view of an embodiment from another perspective.

[0029] Icon labels:

[0030] 1-Corner fitting of housing, 2-Column, 3-Modible block, 4-Locking shaft head, 5-Screw shaft, 6-First wedge-shaped push block, 7-Second wedge-shaped push block, 8-First guide slope, 9-Second guide slope, 10-Lifting hole, 11-Shaft sleeve, 12-Mounting hole, 13-Sealing plate, 14-Assembly corner fitting, 15-Base plate, 16-Bottom hole, 17-Connecting section, 18-Adapter block, 19-Push element guide plate, 20-Modible block guide plate, 21-Upper stacked housing, 22-Lower base housing, 23-Top hole. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0037] See Figure 1 -Appendix Figure 3 As shown, Figure 1 This is a schematic diagram of the structure of the lower base box provided in the embodiment of this application. It shows the structure of the lower base box 22 as the base when the lower base box 22 is selected as a folding box and the legs are upright. The box corner piece 1 is set at the top of the legs and the box corner piece 1 has a slot inside, which is connected to the top hole.

[0038] Figure 2 This is a schematic diagram of the assembly of the extension corner post and the lower base box provided in the embodiment of this application. It shows that when the lower base box 22 is selected as a folding box, after the extension corner post is installed on the lower base box 22, the post 2 stands above the support leg to play an extension role. The bottom of the post 2 is assembled on the box corner piece 1, and the top of the post 2 is provided with an assembly part waiting to be connected to the upper stacked box 21 as the upper stacked structure.

[0039] Figure 3 The diagram illustrates the assembly of the extension corner post between the upper stacked box and the lower base box, as provided in this embodiment of the application. It shows that when both the upper stacked box 21 and the lower base box 22 are foldable boxes, the upper stacked box 21, as the upper stacked structure, is assembled on the lower base box 22, which is provided with the extension corner post. The extension corner post extends the distance between the upper stacked box 21 and the lower base box 22, thereby expanding their storage space and forming a foldable box with greater storage capacity.

[0040] Among them, the corner fitting 1 refers to the metal component set at the end of the box and serving a connecting function. The upper stacked box 21 and the lower base box 22 are not limited to being selected as folding boxes. Other conventional boxes equipped with corner fitting 1 can also be assembled using the extension corner post of this application.

[0041] Please refer to the attached instruction manual. Figure 4 and attached Figure 5 , Figure 4 This is an exploded view of the assembly of the extension corner post and the box corner fitting provided in the embodiments of this application. Figure 5 for Figure 4 The following is an exploded view of the assembly of an embodiment from another perspective. An extension corner post is shown, used for assembly between the upper stacked box 21 and the lower base box 22, extending the distance between them and facilitating their assembly. The extension corner post mates with the top hole 23 of the corner piece 1 of the lower base box 22. The extension corner post includes a post body 2 and a movable locking shaft. The top of the post body 2 is used to connect and mount the upper stacked box 21, and a cavity is provided inside the post body 2. The movable locking shaft includes a movable block 3 and a locking shaft head 4 disposed at the end of the movable block 3. The movable block 3 is disposed within the cavity and can move along the length of the post body 2 within the cavity. The locking shaft head 4 extends to the outer side of the bottom of the post body 2 and moves along with the movable block 3.

[0042] The column 2 includes a first state and a second state. The first state refers to the state where the column 2 is vertical and the locking shaft head 4 of the column 2 extends into the top hole 23 of the box corner piece 1 in a downward state, following the movable block 3.

[0043] The second state refers to the following: Based on the first state, with the locking shaft head 4 located inside the corner piece 1 of the housing, the column 2 is rotated along its axis, causing the locking shaft head 4 inside the corner piece 1 to engage with the top hole 23, preventing the column 2 from dislodging from the top hole 23. Afterward, positioning the corner post with the corner piece of the housing achieves the desired extension effect.

[0044] In one embodiment of this application, in actual use, both the lower base box 22 and the upper stacked box 21 are foldable boxes. Foldable legs are provided at the four corners of the surface of the foldable box, and box corner pieces 1 are provided on the foldable legs.

[0045] Select the lower base box 22 and support it with its legs. Take the extension corner post that matches the corner piece 1 of the lower base box 22. Align the locking shaft head 4 of the extension corner post 2 with the top hole 23 and insert it. At this time, the post 2 is in a vertical state, and the locking shaft head drive assembly does not restrict the movable block 3. The movable block 3 falls naturally along the length of the post 2 in the cavity, and the locking shaft head 4 is in a movable, drooping state. After the locking shaft head 4 is inserted into the empty slot inside the corner piece 1 through the top hole 23, rotate the post 2 along its axis. The locking shaft head 4 will move away from the corner piece 1 and engage with the inner side of the top hole 23 in the empty slot. At this time, the locking shaft head 4 will not be able to come out of the top hole 23. Adaptably, to achieve the above effect, the shape of the locking shaft head 4 and the connection shape between the locking shaft head 4 and the movable block 3 are designed to achieve the above effect. After confirming that the locking shaft head 4 is engaged with the corner piece 1 of the housing after rotation, the driving movable block 3 is lifted in the cavity, and the force of the locking shaft head 4 is recovered and will drive the column 2 to move closer to the corner piece 1 of the housing in the opposite direction, so that the locking shaft head 4 loses its mobility and locks the column 2 onto the corner piece 1 of the housing.

[0046] The extension corner posts of this application are assembled between the boxes, thereby increasing the accommodation space between the boxes. The assembly between the extension corner posts and the boxes is stable, simple, rigid, and highly versatile.

[0047] In one embodiment of this application, the extension corner post further includes a locking shaft drive assembly. The positioning end of the locking shaft drive assembly is disposed within the cavity, and the driving end of the locking shaft drive assembly penetrates through the movable block 3 to the outer side of the side wall of the column 2. The locking shaft drive assembly is used to drive the movable block 3 to move along the length direction of the column 2, thereby retracting the locking shaft head 4 into the cavity, so that the column 2 is fitted and locked onto the corner piece 1 of the lower base box. The aforementioned locking shaft drive assembly includes a drive shaft and a pushing element movably disposed on the drive shaft. The driving end of the drive shaft penetrates through the movable block 3 to the outer side of the side wall of the column. The rotation of the drive shaft along its own axis can drive the pushing element to move along the length direction of the drive shaft. During the movement of the pushing element, it will push the movable block 3, causing the movable block 3 to move along the length direction of the column, thereby driving the locking shaft head 4 to move. The user can use a tool to drive the drive end of the drive shaft located on the outside of the column 2, thereby rotating the drive shaft. The drive shaft passes through the movable block 3, and the moving path of the pushing element needs to pass through the movable block 3, thus causing the pushing element to contact the movable block 3 and push the movable block 3 to rise along the length of the column 2. Similarly, as the pushing element gradually moves away from the contact with the movable block 3, the movable block 3 will naturally droop to a lower position in the cavity due to gravity, restoring the mobility of the locking shaft head 4.

[0048] In one embodiment of this application, reference is made to Figures 6-8 , Figure 6 This is a cross-sectional view of the locking shaft of the extension corner post provided in the embodiment of this application after it is assembled with the corner piece of the housing in the extended state. Figure 7 This is a cross-sectional view of the locking shaft of the extension corner post provided in the embodiment of this application after it is assembled with the corner piece of the housing in the retracted state. Figure 8 for Figure 7 The embodiment is shown in a cross-sectional view from another perspective. The aforementioned drive shaft is configured as a screw shaft 5, the end of which is rotatably mounted on the cavity structure of the column 2, and the drive end of the screw shaft 5 extends to the outside of the column 2.

[0049] The aforementioned screw shaft 5 includes a first threaded section and a second threaded section continuously arranged, with the threading direction of the first threaded section being opposite to that of the second threaded section. In one embodiment of this application, the screw shaft 5 is selected as a double-ended screw with both positive and negative threads. The aforementioned pushing element includes a first wedge-shaped pushing block 6 threadedly connected to the first threaded section and a second wedge-shaped pushing block 7 threadedly connected to the second threaded section. The first wedge-shaped pushing block 6 and the second wedge-shaped pushing block 7 are respectively disposed on both sides of the movable block 3. The side of the first wedge-shaped pushing block 6 facing the movable block 3 is provided with a first guide slope 8, and the side of the second wedge-shaped pushing block 7 facing the movable block 3 is provided with a second guide slope 9.

[0050] When the screw shaft 5 rotates, because the threads of the two threaded sections are opened in opposite directions, the first wedge-shaped push block 6 and the second wedge-shaped push block 7 move closer to each other or further away from each other on the screw shaft 5. When the two move closer to each other, the first guide slope 8 and the second guide slope 9 of the two wedge blocks will contact the movable block 3 from both sides, thereby cooperating to contact the movable guide block 3 to move.

[0051] Both the first guide ramp 8 and the second guide ramp 9 are set as upward inclined ramps. When the first wedge-shaped push block 6 and the second wedge-shaped push block 7 on both sides clamp the movable block 3, the movable block 3 continues to rise along the ramp. Conversely, when the first wedge-shaped push block 6 and the second wedge-shaped push block 7 move away from each other, the movable block 3 descends along the ramp until it completely breaks away from the contact with the push element and falls naturally.

[0052] In one embodiment of this application, the movable block 3 has a lifting hole 10 on its side. The lifting hole 10 is the same width as the pushing element, and the length of the lifting hole 10 along the length of the column 2 is greater than the length of the pushing element. When the pushing element contacts the movable block 3, the pushing element will contact and be guided to the inner wall of the lifting hole 10, thereby pushing the movable block 3 to move. The pushing element will gradually enter the lifting hole 10, and the side of the pushing element will be limited by the side wall of the lifting hole 10. When the pushing element drives the movable block 3 to move along the length of the column 2, the length of the lifting hole 10 leaves room for the moving element to move.

[0053] In one embodiment of this application, a bushing 11 for mounting a drive shaft is provided inside the cavity of the aforementioned column 2. A mounting hole 12 communicating with the cavity is provided on the side wall of the column 2. The mounting hole 12 facilitates the installation of the shaft drive assembly. A sealing plate 13 for shielding is correspondingly provided on the mounting hole 12. The bushing 11 is mounted on the sealing plate 13, and the drive shaft can rotate on the bushing 11. The cooperation between the drive shaft and the bushing 11 can refer to the prior art. Similarly, the structure of the sealing plate 13 and the assembly method with the mounting hole 12 can also refer to conventional solutions in the prior art, serving only as one type of positioning and mounting base for the bushing 11, and will not be elaborated further here.

[0054] In one embodiment of this application, the top of the aforementioned column 2 is provided with an assembly corner piece 14, which has an assembly hole for positioning and connecting with the upper stacked box 21. The aforementioned assembly corner piece 14 can be designed with reference to standard parts for box connection, and only needs to meet the connection and cooperation with the box, so that the corner column has versatility and can meet the disassembly and assembly of various types of boxes. The specific structure of the assembly corner piece 14 will not be described in detail here.

[0055] In one embodiment of this application, the aforementioned extension corner post further includes a base plate 15 disposed at the bottom of the column 2. The base plate 15 has a through-hole 16 extending along the length of the column 2. A movable block 3 is disposed within a cavity inside the through-hole 16, and a locking shaft head 4 is disposed outside the through-hole 16. A connecting section 17 is disposed between the movable block 3 and the locking shaft head 4. The connecting section 17 penetrates the through-hole 16 and is slightly longer than the depth of the through-hole 16, allowing for a certain amount of movement. The opening area of ​​the through-hole 16 is smaller than the cross-sectional area of ​​the movable block 3 and the locking shaft head 4, and the cross-sectional area of ​​the connecting section 17 is smaller than the opening area of ​​the through-hole 16. This allows the connecting section 17 to move within the through-hole 16, but the movable block 3 and the locking shaft head 4 cannot pass through the through-hole 16, preventing them from separating from the column 2.

[0056] In one embodiment of this application, the top hole 23 of the corner fitting 1 is configured as an oblong hole. Correspondingly, the bottom hole 16 is also oblong on the bottom plate 15. When the column 2 is to be installed with the corner fitting 1, the bottom hole 16 is parallel to the top hole 23. The locking shaft head 4, which is shaped to conform to the oblong top hole 23, extends into the top hole 23. After the locking shaft head 4 is fully inserted into the corner fitting 1, the column 2 is rotated until the bottom hole 16 is perpendicular to the top hole 23. At this time, the long end of the locking shaft head 4 will not be able to disengage from the wide side of the top hole 23, ensuring that the column 2 is connected to the corner fitting 1.

[0057] Furthermore, an adapter block 18 is provided at the bottom of the base plate 15. The adapter block 18 is used to engage with the gap between the base plate 15 and the top hole 23 after the column 2 rotates, so that the column 2 and the box corner piece 1 are firmly connected.

[0058] In one embodiment, the adapter block 18 is set as a rectangular block on both sides of the waist-shaped bottom hole 16. When the column 2 is in the first state, the waist-shaped bottom hole 16 and the waist-shaped top hole 23 are horizontally arranged, and the locking shaft head 4 extends into the waist-shaped top hole 23. Then, the column 2 is rotated to the second state, and the length of the long side of the locking shaft head 4 is greater than the length of the wide side of the waist-shaped top hole 23, so that the locking shaft head 4 is engaged in the box corner piece 1. Then, the column 2 and the box corner piece 1 are locked together by the locking shaft head drive assembly. At this time, the adapter block 18 will be engaged in the waist-shaped top hole 23, filling part of the gap of the top hole 23 and preventing the bottom plate 15 from moving relative to the box corner piece 1. In one embodiment of this application, the above-mentioned locking shaft drive assembly also includes a push element guide plate 19 and a movable block guide plate 20. The push element guide plate 19 is arranged inside the movable block 3 along the length direction of the drive shaft and is used to guide the bottom surface of the push element. The aforementioned movable block guide plate 20 is disposed inside the cavity, above the movable block 3. The movable block guide plate 20 includes a side plate. When the movable block 3 moves, the side plate can restrict the movable block 3 to move along a predetermined path and limit the movable block 3 to move to the highest position at the top of the cavity. The method of setting the movable block guide plate 20 can be changed according to actual needs. It is only necessary to limit a part of the movement path of the movable block 3, which will not be elaborated here.

[0059] In one embodiment of this application, the cross-section of the locking shaft head 4 is contoured to the cross-section of the top hole 23 of the corner piece 1. When the locking shaft head 4 and the column 2 approach the corner piece 1 in the aligned direction, the locking shaft head 4 can precisely enter the top hole 23. Subsequently, by rotating the column 2, the connecting section 17 between the locking shaft head 4 and the movable block 3 can still move within the top hole 23. However, since the locking shaft head 4 is contoured to the top hole 23, when the locking shaft head 4 deviates from the top hole 23, the locking shaft head 4 can no longer be moved out of the top hole 23, thus achieving engagement. Of course, it is foreseeable that various shapes of the locking shaft head 4 that satisfy the two states of the column 2 described above are all within the protection scope of this solution, and will not be elaborated upon here.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An extension corner post, used for installation between an upper stacked box and a lower base box, wherein its bottom is assembled with the top hole of a corner piece of the lower base box, characterized in that, include: The column has a top for connecting to the upper stacked box and an internal cavity. The movable locking shaft includes a movable block and a locking shaft head disposed on the movable block. The movable block is disposed within the cavity and can move within the cavity along the length direction of the column. The locking shaft head extends to the outer side of the bottom of the column. The column includes a first state and a second state. In the first state, the locking shaft head extends into the top hole of the corner piece of the housing. In the second state, the locking shaft head is engaged in the top hole of the corner piece of the housing.

2. The corner post for extension according to claim 1, characterized in that, It also includes a locking shaft drive assembly, which includes a drive shaft and a push element movably mounted on the drive shaft; the drive end of the drive shaft passes through the movable block to the outside of the side wall of the column; the drive shaft can rotate along its own axis to drive the push element to move along the length direction of the drive shaft, thereby causing the push element to push the movable block to move.

3. The corner post for extension according to claim 2, characterized in that, The drive shaft is configured as a screw shaft, which includes a continuous first threaded section and a second threaded section, wherein the threads of the first threaded section and the second threaded section are opened in opposite directions. The pushing element includes a first wedge-shaped pushing block threadedly connected to the first threaded segment and a second wedge-shaped pushing block threadedly connected to the second threaded segment; The first wedge-shaped push block and the second wedge-shaped push block are respectively placed on both sides of the movable block. The first wedge-shaped push block has a first guide slope on the side facing the movable block, and the second wedge-shaped push block has a second guide slope on the side facing the movable block. The first guide slope and the second guide slope are used to cooperate to guide the movement of the movable block.

4. The corner post for extension according to claim 2, characterized in that, The movable block has a lifting hole on its side. The lifting hole is the same width as the pushing element, and the length of the lifting hole is greater than the length of the pushing element.

5. The corner post for extension according to claim 2, characterized in that, The cavity is provided with a bushing for positioning and installing the positioning end of the drive shaft, and the drive shaft can rotate within the bushing along its own axis; the side wall of the column is provided with a mounting hole, and a sealing plate is correspondingly provided in the mounting hole, and the bushing is disposed on the sealing plate.

6. The corner post for extension according to claim 1, characterized in that, The top of the column is provided with an assembly corner piece, and the assembly corner piece has an assembly hole for positioning and connection with the upper stacked box.

7. The corner post for extension according to claim 1, characterized in that, It also includes a base plate disposed at the bottom of the column, the base plate having a bottom hole along the length of the column, the area of ​​the bottom hole being smaller than the cross-sectional area of ​​the movable block and the cross-sectional area of ​​the locking shaft head, a connecting section being disposed between the locking shaft head and the movable block, the cross-sectional area of ​​the connecting section being smaller than the area of ​​the bottom hole, the connecting section moving within the bottom hole; an adapter block being disposed on the bottom surface of the base plate, the adapter block being used to fill the gap between the base plate and the opening of the corner piece of the housing.

8. The corner post for extension according to claim 2, characterized in that, The locking shaft drive assembly further includes a push element guide plate and a movable block guide plate; the push element guide plate is disposed inside the movable block along the length direction of the drive shaft and is used to guide the bottom surface of the push element; the movable block guide plate is disposed inside the cavity and above the movable block and is used to restrict the movement of the movable block along the length and width directions of the column.

9. The corner post for extension according to claim 1, characterized in that, The cross-section of the locking shaft head is contoured to the cross-section of the top hole of the corner piece of the housing.

10. A folding container, comprising the upper stacked container body and the lower base container body, characterized in that, It also includes the extension corner post as described in any one of claims 1-9, wherein the extension corner post is assembled between the upper stacked box and the lower base box.

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