Hinge device and folding container

Abstract

The utility model discloses a hinge device and a folding container. The hinge device comprises a fixed hinge, a movable hinge, a bracket pin shaft and a locking mechanism; the movable hinge is rotatably connected to the fixed hinge at a vertical position and a horizontal position; the locking mechanism is provided with a support rotating hole, the support pin shaft is sleeved with the support rotating hole, so that the locking mechanism is rotatably connected to the fixed hinge and can rotate to a locking position for locking the movable hinge located at the vertical position, and the locking mechanism away from the locking position unlocks the movable hinge; when the locking mechanism is located at the locking position, the included angle between the connecting line between the projection of the axis of the support rotating hole and the projection of the gravity center of the locking mechanism and the horizontal plane ranges from-50 degrees to 50 degrees. Therefore, when the locking mechanism is subjected to acting force in the length direction of the bottom frame, the probability that the locking mechanism rotates to leave the locking position can be reduced, and then the probability that the movable hinge located at the vertical position is unlocked is reduced.

Description

Technical Field

[0001] The utility model relates to the field of containers, in particular to a hinge device and a foldable container. Background Art

[0002] Currently, foldable containers include a hinge assembly. The hinge assembly includes a fixed hinge, a movable hinge, and a locking mechanism. The locking mechanism is rotatably connected to the fixed hinge via a bracket pin. The locking mechanism is used to lock the movable hinge in a vertical position.

[0003] When the locking mechanism locks the living hinge in the vertical position, the distance between the center of gravity of the locking mechanism and the bracket pin in the vertical direction is relatively large. Therefore, when the locking mechanism locks the living hinge in the vertical position, if an impact is applied along the length of the chassis from the end of the chassis toward the center of the chassis, the locking mechanism may rotate, thereby leaving the position in which the living hinge is locked in the vertical position, thereby releasing the locking of the living hinge in the vertical position.

[0004] Therefore, it is necessary to provide a new hinge device and a foldable container to at least partially solve the above problems. Utility Model Content

[0005] The Summary of the Utility Model introduces a series of simplified concepts that will be further described in the Specific Examples. The Summary of the Utility Model does not intend to limit the key features and essential technical features of the claimed technical solution, nor does it intend to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above technical problems, the present invention provides a hinge device for a foldable container, comprising:

[0007] Fixed hinge;

[0008] a living hinge rotatably connected to the fixed hinge in a vertical position and a horizontal position;

[0009] a bracket pin, the bracket pin being disposed on the fixed hinge; and

[0010] The locking mechanism includes a bracket rotation hole, the bracket rotation hole is sleeved on the bracket pin, so that the locking mechanism is rotatably connected to the fixed hinge, so that it can be rotated to a locked position to lock the movable hinge in the vertical position, and the locking mechanism releases the lock of the movable hinge when it leaves the locked position;

[0011] In which, when the locking mechanism is in the locking position, on the projection plane perpendicular to the axis of the bracket rotating hole, the angle range of the line between the projection of the axis of the bracket rotating hole and the projection of the center of gravity of the locking mechanism relative to the horizontal plane is within plus or minus 50°.

[0012] According to the hinge device of the present invention, when the locking mechanism is in the locked position, on the projection plane perpendicular to the axis of the bracket rotating hole, the angle range of the line connecting the projection of the axis of the bracket rotating hole and the projection of the center of gravity of the locking mechanism relative to the horizontal plane is within plus or minus 50 degrees. In this way, when the locking mechanism is subjected to a force along the length direction of the base frame, the probability of the locking mechanism rotating away from the locked position can be reduced, thereby reducing the probability of unlocking the movable hinge in the vertical position.

[0013] Optionally, the locking mechanism comprises:

[0014] A locking block, when the movable hinge is in a vertical position, the locking block is clamped between the fixed hinge and the movable hinge;

[0015] The bracket is arranged between the fixed hinge and the movable hinge, and the bracket rotation hole has a bracket rotation hole;

[0016] Among them, an oblong hole is provided on the top of the bracket, and the locking block is provided with a locking block hole, which is a circular hole. The locking mechanism also includes a locking block pin shaft, which passes through the oblong hole and the locking block hole so that the locking block can be movably connected to the bracket along the extension direction of the long axis of the oblong hole.

[0017] Optionally, the hinge device further comprises a handle, which is rotatably connected to the bracket between the open position and the storage position, and the handle is located below the bracket pin.

[0018] The hinge device also includes a blocking member connected to the bracket, and the handle in the open position abuts against the blocking member to drive the bracket to rotate, thereby causing the locking mechanism to rotate away from the locked position. The handle also includes an operating part, and the operating part of the handle in the open position is located on the outside of the fixed hinge.

[0019] Optionally, the handle in the storage position is located within the fixed hinge, and the handle further comprises an abutment portion, which is located upstream of the blocking member in a counterclockwise direction around the rotation axis of the handle.

[0020] Optionally, the blocking member is located below the bracket pin, or

[0021] The blocking member is a bracket pin.

[0022] Optionally, the center of gravity of the handle is located inside the rotation axis of the handle, so that the handle rotates toward the storage position under the action of its own gravity.

[0023] Optionally, the bracket is provided with a bracket avoidance groove, the fixed hinge has a hinge avoidance groove, and when the handle is located at the storage position, the operating part is located at the bracket avoidance groove and the hinge avoidance groove.

[0024] Optionally, the fixed hinge comprises two spaced-apart wall panels, the locking mechanism is located between the two wall panels, and the inner wall panel has a hinge avoidance groove.

[0025] The bracket includes two side plates arranged at intervals, the handle is located between the two side plates, and both side plates are provided with bracket avoidance grooves.

[0026] Optionally, the height dimension of the fixed hinge is greater than 370 mm.

[0027] The utility model also provides a foldable container, which includes the aforementioned hinge device.

[0028] According to the foldable container of the present invention, the foldable container includes the aforementioned hinge device. According to the hinge device of the present invention, when the locking mechanism is in the locked position, on the projection plane perpendicular to the axis of the bracket rotating hole, the angle range of the line between the projection of the axis of the bracket rotating hole and the projection of the center of gravity of the locking mechanism relative to the horizontal plane is within plus or minus 50°. In this way, when the locking mechanism is subjected to a force along the length direction of the base frame, the probability of the locking mechanism rotating away from the locked position can be reduced, thereby reducing the probability of releasing the lock of the movable hinge in the vertical position. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the advantages of the present invention more easily understood, the present invention briefly described above will be described in more detail with reference to specific embodiments shown in the accompanying drawings. It will be understood that these drawings depict only typical embodiments of the present invention and are therefore not to be considered as limiting the scope of protection thereof. The accompanying drawings describe and explain the present invention with additional specificity and detail.

[0030] Figure 1 is a perspective schematic diagram of a foldable container using a hinge device according to a first preferred embodiment of the present utility model;

[0031] Figure 2 for Figure 1 A three-dimensional schematic diagram of a hinge device, wherein the movable hinge is in a vertical position and the locking mechanism is in a locked position;

[0032] Figure 3 for Figure 2 A three-dimensional schematic diagram of a hinge device, wherein the movable hinge is in a horizontal position and the locking mechanism is in a locked position;

[0033] Figure 4 for Figure 2A perspective schematic diagram of a hinge device, wherein the movable hinge is located between a vertical position and a horizontal position, and the locking mechanism is located in a released position;

[0034] Figure 5 for Figure 2 A three-dimensional schematic diagram of a fixed hinge of a hinge device;

[0035] Figure 6 for Figure 2 A three-dimensional schematic diagram of a living hinge of a hinge device;

[0036] Figure 7 for Figure 2 A three-dimensional schematic diagram of the locking mechanism of the hinge device, wherein the bracket pin and the handle are not shown in the storage position;

[0037] Figure 8 for Figure 2 A three-dimensional schematic diagram of the locking mechanism of the hinge device, wherein the bracket pin and the handle are not shown in the open position;

[0038] Figure 9 for Figure 2 A schematic side view of the locking mechanism of the hinge device, wherein the bracket pin is not shown, the handle is in the storage position, and the bracket is cut away at the handle;

[0039] Figure 10 for Figure 2 A schematic side view of the locking mechanism of the hinge device, wherein the bracket pin is not shown, the handle is in the open position, and the bracket is cut away at the handle;

[0040] Figure 11 for Figure 2 An exploded schematic diagram of the locking block and locking block pin of the hinge device; and

[0041] Figure 12 It is a side view schematic diagram of the locking mechanism of the hinge device according to the second preferred embodiment of the present invention, wherein the handle is located in the open position and the bracket is cut away at the handle.

[0042] Description of Reference Numerals

[0043] 110: Fixed hinge 111: Wall panel

[0044] 112: Bottom corner piece 113: Hanging corner piece

[0045] 114: Locking surface 120: Living hinge

[0046] 121: protrusion 122: support surface

[0047] 130: Pivot shaft 140: Locking mechanism

[0048] 141: Locking block 142: Bracket pin

[0049] 143: Bracket 144: Side panel

[0050] 145: Connecting plate 146: Long round hole

[0051] 147: Locking block pin 148: Locking block hole

[0052] 149: Stopper 150: Handle

[0053] 151: operating portion 152: contact portion

[0054] 153: handle pin 161: bracket avoidance groove

[0055] 162: Hinge avoidance groove 163: Bracket rotation hole

[0056] 170: bottom frame 180: end frame

[0057] 242: Bracket pin 252: Abutment portion DETAILED DESCRIPTION

[0058] In the following description, numerous specific details are provided to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without one or more of these details. In other instances, certain technical features known in the art are not described to avoid confusion with embodiments of the present invention.

[0059] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower" and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0060] In this document, ordinal numbers such as “first” and “second” cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order.

[0061] To thoroughly understand the embodiments of the present invention, a detailed structure will be provided in the following description. Obviously, the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0062] The utility model provides a hinge device. The hinge device is used for a foldable container. The foldable container includes a base frame 170 and an end frame 180.

[0063] Please refer to Figures 1 to 11The hinge device includes a fixed hinge 110, a movable hinge 120, a pivot shaft 130, and a locking mechanism 140. The fixed hinge 110 is fixedly connected to the bottom frame 170. The movable hinge 120 is fixedly connected to the end frame 180.

[0064] like Figures 2 to 5 As shown, fixed hinge 110 includes a bottom corner piece 112, a hanging corner piece 113, and a wall panel 111. Bottom corner piece 112 is connected to the bottom end of wall panel 111. Hanging corner piece 113 is connected to the top end of wall panel 111. Fixed hinge 110 includes two wall panels 111. The plane on which wall panels 111 lie is perpendicular to the width direction of base frame 170. Hanging corner piece 113 has a downward-facing locking surface 114.

[0065] like Figures 2 to 4 ,as well as Figure 6 As shown, living hinge 120 is located between two wall panels 111. A protrusion 121 is provided at the outer end of living hinge 120. Protrusion 121 includes an upwardly facing support surface 122. The outer end of living hinge 120 is the end of living hinge 120 that is away from the center of base frame 170 along the length direction of living hinge 120 when living hinge 120 is in a vertical position.

[0066] The pivot shaft 130 passes through the fixed hinge 110 and the movable hinge 120 in sequence, pivotally connecting the movable hinge 120 to the fixed hinge 110. This allows the movable hinge 120 to move between a vertical position and a horizontal position. Thus, the end frame 180 is rotatably connected to the base frame 170 via the hinge assembly. When the movable hinge 120 is in the vertical position, the plane on which the end frame 180 lies is perpendicular to the plane on which the base frame 170 lies. When the movable hinge 120 is in the horizontal position, the end frame 180 lies above and overlaps the base frame 170. At this point, the plane on which the end frame 180 lies is parallel to the plane on which the base frame 170 lies.

[0067] like Figures 2 to 4 ,as well as Figures 7 to 11 As shown, the hinge device further includes a locking mechanism 140 and a bracket pin 142. The bracket pin 142 is disposed on the fixed hinge 110. The locking mechanism 140 is rotatably connected to the fixed hinge 110 via the bracket pin 142, allowing it to be rotated to a locked position. When the locking mechanism 140 is in the locked position, the locking mechanism 140 locks the movable hinge 120 in the vertical position. When the locking mechanism 140 leaves the locked position, the movable hinge 120 is unlocked.

[0068] Specifically, the locking mechanism 140 includes a locking block 141, a bracket 143, and a locking block pin 147. The bracket 143 includes two side panels 144. The plane on which the side panels 144 are located is parallel to the plane on which the wall panels 111 are located. One side panel 144 is located between one wall panel 111 and the movable hinge 120. The other side panel 144 is located between the other wall panel 111 and the movable hinge 120. The side panels 144 have a bracket rotation hole 163. The bracket pin 142 is inserted through the bracket rotation hole 163 and the wall panel 111 to allow the bracket 143 to be rotatably connected to the wall panel 111. The locking block 141 is rotatably connected to the top of the side panel 144 via the locking block pin 147. When the movable hinge 120 is in the vertical position, the locking block 141 is clamped between the locking surface 114 and the support surface 122 to lock the movable hinge 120 in the vertical position.

[0069] The bracket pin 142 is disposed at the outer end of the bracket 143, away from the center of the base frame 170, along the length of the base frame 170. When the locking mechanism 140 is in the locked position, the center of gravity G1 of the locking mechanism 140 is located inward of the bracket pivot hole 163, near the center of the base frame 170, along the length of the base frame 170. When the locking mechanism 140 is in the locked position, the angle between the projection of the axis of the bracket pivot hole 163 and the projection of the center of gravity G1 of the locking mechanism 140 relative to the horizontal plane is within a range of plus or minus 50 degrees on a projection plane perpendicular to the axis of the bracket pivot hole 163. Furthermore, the axis of the bracket pivot hole 163 and the center of gravity G1 of the locking mechanism 140 are located on the same horizontal plane. This reduces the probability of the locking mechanism 140 rotating out of the locked position when subjected to a force along the length of the base frame 170, thereby reducing the probability of unlocking the movable hinge 120 in the vertical position.

[0070] In this embodiment, when the locking mechanism 140 is in the locked position, on the projection plane perpendicular to the axis of the bracket rotating hole 163, the angle between the projection of the axis of the bracket rotating hole 163 and the projection of the center of gravity G1 of the locking mechanism 140 relative to the horizontal plane is within plus or minus 50 degrees. In this way, when the locking mechanism 140 is subjected to a force along the length direction of the base frame 170, the probability of the locking mechanism 140 rotating away from the locked position can be reduced, thereby reducing the probability of releasing the lock of the movable hinge 120 in the vertical position.

[0071] Alternatively, as Figure 9 As shown, the center of gravity G1 of the locking mechanism 140 is located on the inner side of the bracket rotation hole 163 along the length direction of the base frame 170 and close to the center of the base frame 170. In this way, when the locking mechanism 140 leaves the locked position, the locking mechanism 140 automatically returns to the locked position under the action of its own gravity.

[0072] Alternatively, as Figures 7 to 10 As shown, an oblong hole 146 is provided at the top of the side plate 144. When the locking mechanism 140 is in the locked position, the long axis of the oblong hole 146 extends parallel to the vertical direction. The locking block 141 is provided with a locking block hole 148. The locking block hole 148 is a circular hole. The locking block pin 147 can be an elastic cylindrical pin. The locking block pin 147 is inserted through the locking block hole 148 and the oblong hole 146 to enable the locking block 141 to move along the long axis of the oblong hole 146. This allows the movable hinge 120 to rotate more flexibly between the vertical and horizontal positions, avoiding interference between the movable hinge 120 and the locking block 141.

[0073] Furthermore, the bracket 143 further includes a connecting plate 145. The connecting plate 145 is disposed at an outer end of the side plate 144 away from the center of the bottom frame 170 along the length direction of the bottom frame 170. The connecting plate 145 is fixedly connected between the two side plates 144. Thus, the strength of the bracket 143 is high.

[0074] like Figures 7 to 10 As shown, the oblong holes 146 are all arranged on the side plate 144. In this way, the oblong holes 146 are all arranged on the side plate 144, and processing can be achieved only by annular cutting and blanking, which is simpler to process, low in cost, and better in precision control.

[0075] Please refer to Figures 2 to 4 ,as well as Figures 7 to 9 The hinge assembly further includes a handle 150 and a handle pin 153. The handle 150 is located between the two side panels 144. The handle 150 is rotatably connected to the side panels 144 via the handle pin 153. Thus, the handle 150 can rotate about the handle pin 153 between an open position and a stowed position. The handle 150 is located below the bracket pin 142.

[0076] The hinge device further includes a stopper 149. The stopper 149 is connected to the bracket 143. The stopper 149 is located between the two side plates 144 and is connected to the two side plates 144. In this way, the strength of the bracket 143 is greater.

[0077] The handle 150 includes an operating portion 151 and an abutting portion 152. The operating portion 151 is connected to the abutting portion 152. The extending direction of the operating portion 151 and the extending direction of the abutting portion 152 intersect. The handle pin 153 is located at the connection between the operating portion 151 and the abutting portion 152. Figure 10 As shown, when the handle 150 is in the open position, the abutment portion 152 abuts against the blocking member 149. At this time, if a counterclockwise (downward) force around the handle pin 153 (the axis of the handle pin 153 is the rotation axis) is continuously applied to the handle 150, the handle 150 drives the bracket 143 to rotate counterclockwise, thereby transmitting the torque to the locking mechanism 140, thereby driving the locking mechanism 140 to rotate counterclockwise and leave the locked position.

[0078] like Figure 10 As shown, when the handle 150 is in the open position, the operating portion 151 is located outside the fixed hinge 110 along the length direction of the bottom frame 170 and away from the center of the bottom frame 170. Therefore, the operating space for operating the operating portion 151 is large, and the operating portion 151 is easy to operate.

[0079] like Figure 10 As shown, around the rotation axis of the handle 150, the abutment portion 152 is located counterclockwise upstream of the blocking member 149. Thus, when the handle 150 is in the open position, the operating portion 151 can be stepped on to rotate the locking mechanism 140 away from the locked position.

[0080] like Figure 9 As shown, the handle 150 at the storage position is located within the fixed hinge 110. At this time, the handle 150 can be prevented from being misoperated.

[0081] like Figures 7 to 10 As shown, the blocking member 149 is located below the bracket pin 142. Thus, the height dimension of the fixed hinge 110 can be larger to have a larger space for arranging the handle 150.

[0082] Please refer to Figures 2 to 5 ,as well as Figures 7 to 10 The outer ends of the two side panels 144, along the length of the base frame 170 and away from the center of the base frame 170, are recessed toward the center of the base frame 170 to form a bracket avoidance groove 161. A hinge avoidance groove 162 is provided on the wall panel 111 at a position corresponding to the bracket avoidance groove 161. When the locking mechanism 140 is in the locked position, the bracket avoidance groove 161 is located at the operating portion 151. As a result, the operating portion 151 of the handle 150 can be affected via the bracket avoidance groove 161 and the hinge avoidance groove 162, thereby rotating the handle 150 to the open position.

[0083] Further, if Figures 2 to 4 As shown, along the width direction of the base frame 170, a wall panel 111 near the center of the base frame 170 is provided with a hinge avoidance groove 162. The other wall panel 111 may not be provided with a hinge avoidance groove 162 to resist external impact along the width direction of the base frame 170.

[0084] Alternatively, as Figure 9 and Figure 10As shown, G2 is the center of gravity of the handle 150. When the handle 150 is in the stowed position, G2 is located to the lower right of the handle pin 153. When the handle 150 is in the open position, G2 is located to the upper right of the handle pin 153. Regardless of the position of the handle 150, G2 is always located to the right of the handle pin 153 (laterally toward the center of the base frame 170 along the length of the base frame 170). In this way, the handle 150 can rotate from the open position toward the stowed position under the action of its own gravity, so that the handle 150, after leaving the stowed position, automatically returns to the stowed position and remains in the stowed position.

[0085] Please refer to Figures 2 to 4 , the locking mechanism 140 can move between a locking position and a release position for releasing the movable hinge 120. When the movable hinge 120 rotates from a horizontal position to a vertical position, the movable hinge 120 can abut against the locking block 141 and push the locking block 141. At this time, due to the setting of the aforementioned oblong hole 146, the action of the movable hinge 120 on the locking block 141 can be transmitted to the bracket 143, so that the locking mechanism 140 leaves the locking position. When the movable hinge 120 rotates to the vertical position, the locking mechanism 140 rotates to the release position. At this time, the action of the movable hinge 120 on the locking block 141 disappears, and the locking mechanism 140 returns to the locking position under the action of its own gravity, so that the support surface 122 abuts against the locking block 141, thereby locking the movable hinge 120 in the vertical position.

[0086] When the movable hinge 120 needs to be rotated from a vertical position to a horizontal position, the operating portion 151 is operated from the end surface of the fixed hinge 110 through the bracket clearance groove 161 and the hinge clearance groove 162 to rotate the handle 150 to the open position. At this point, the operating portion 151 can be stepped on to rotate the locking mechanism 140 to the release position. This releases the locking mechanism 140 from the movable hinge 120, allowing the movable hinge 120 to rotate from a vertical position to a horizontal position.

[0087] Optionally, the height of the fixed hinge 110 is greater than 370 mm, such as 432 mm, 579 mm or 648 mm, so as to facilitate the provision of the handle 150 .

[0088] Second embodiment

[0089] In the second embodiment, if Figure 12 As shown, the blocking member and the bracket pin 242 are the same part. When the handle is in the open position, the abutment portion 252 abuts the bracket pin 242. This simplifies the structure of the hinge device. In addition, it is convenient to reduce the height of the fixed hinge, saving space.

[0090] The other configurations of the second embodiment are substantially the same as those of the first embodiment and will not be described in detail here.

[0091] The utility model also provides a foldable container, which includes the aforementioned hinge device.

[0092] In this embodiment, the foldable container includes the aforementioned hinge device. When the locking mechanism is in the locked position, on the projection plane perpendicular to the axis of the bracket rotating hole, the angle between the projection of the axis of the bracket rotating hole and the projection of the center of gravity of the locking mechanism relative to the horizontal plane is within plus or minus 50°. In this way, when the locking mechanism is subjected to a force along the length direction of the base frame, the probability of the locking mechanism rotating away from the locked position can be reduced, thereby reducing the probability of unlocking the movable hinge in the vertical position.

[0093] The present invention has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Furthermore, those skilled in the art will appreciate that the present invention is not limited to the above embodiments and that various variations and modifications may be made based on the teachings of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0094] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "component" and the like appearing herein may refer to either a single part or a combination of multiple parts. Terms such as "installation" and "setting" appearing herein may refer to either a component being directly attached to another component or a component being attached to another component through an intermediate. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise stated.

[0095] The present invention has been described through the above embodiments, but it should be understood that the above embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Those skilled in the art will appreciate that many more variations and modifications may be made based on the teachings of the present invention, and all of these variations and modifications fall within the scope of protection claimed by the present invention.

Claims

1. A hinge device for a foldable container, characterized in that: include: Fixed hinge; a living hinge rotatably connected to the fixed hinge in a vertical position and a horizontal position; a bracket pin, the bracket pin being arranged on the fixed hinge; as well as a locking mechanism, the locking mechanism having a bracket rotation hole, the bracket rotation hole being sleeved on the bracket pin, so that the locking mechanism is rotatably connected to the fixed hinge, so as to be able to rotate to a locked position for locking the movable hinge in the vertical position, and the locking mechanism releasing the lock of the movable hinge when leaving the locked position; In which, when the locking mechanism is in the locking position, on the projection plane perpendicular to the axis of the bracket rotating hole, the angle range of the line between the projection of the axis of the bracket rotating hole and the projection of the center of gravity of the locking mechanism relative to the horizontal plane is within plus or minus 50°.

2. The hinge device according to claim 1, characterized in that The locking mechanism comprises: a locking block, wherein when the movable hinge is in the vertical position, the locking block is clamped between the fixed hinge and the movable hinge; a bracket, the bracket being arranged between the fixed hinge and the movable hinge, the bracket rotating hole having the bracket rotating hole; In which, an oblong hole is provided on the top of the bracket, and the locking block is provided with a locking block hole, which is a circular hole. The locking mechanism also includes a locking block pin shaft, which passes through the oblong hole and the locking block hole so that the locking block can be movably connected to the bracket along the extension direction of the long axis of the oblong hole.

3. The hinge device according to claim 2, characterized in that The hinge device further includes a handle, which is rotatably connected to the bracket between an open position and a storage position, and the handle is located below the bracket pin. The hinge device also includes a blocking member connected to the bracket, and the handle in the open position abuts against the blocking member to drive the bracket to rotate, thereby causing the locking mechanism to rotate away from the locking position. The handle also includes an operating part, and the operating part of the handle in the open position is located on the outside of the fixed hinge.

4. The hinge device according to claim 3, characterized in that The handle in the storage position is located within the fixed hinge, and the handle further comprises an abutment portion, which is located upstream of the blocking member in a counterclockwise direction around the rotation axis of the handle.

5. The hinge device according to claim 3, characterized in that: The blocking member is located below the bracket pin, or The blocking member is the bracket pin.

6. The hinge device according to claim 3, characterized in that: The center of gravity of the handle is located inside the rotation axis of the handle, so that the handle rotates toward the storage position under the action of its own gravity.

7. The hinge device according to claim 3, characterized in that: The bracket is provided with a bracket avoidance groove, the fixed hinge has a hinge avoidance groove, and when the handle is located at the storage position, the operating part is located at the bracket avoidance groove and the hinge avoidance groove.

8. The hinge device according to claim 7, characterized in that: The fixed hinge includes two spaced-apart wall panels, the locking mechanism is located between the two wall panels, and the inner wall panel has the hinge avoidance groove. The bracket includes two side plates arranged at intervals, the handle is located between the two side plates, and both side plates are provided with the bracket avoidance groove.

9. The hinge device according to claim 1, characterized in that: The height dimension of the fixed hinge is greater than 370 mm.

10. A foldable container, characterized in that: The foldable container comprises a hinge device according to any one of claims 1 to 9.

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