Folding joint structure

Abstract

The utility model discloses a folding joint structure which comprises a first connecting piece, a second connecting piece and a handle which are rotationally connected, and a locking mechanism capable of locking the first connecting piece, the second connecting piece and the handle at an unfolding position, the handle is in linkage fit with the locking mechanism through the linkage piece. The handle has a first working position and a second working position; when the handle is in the first working position, the first connecting piece and the second connecting piece are in an unfolded state and are locked by the locking mechanism; when the handle rotates to the second working position, the linkage piece is driven to unlock the first connecting piece and the second connecting piece by the locking mechanism; meanwhile, the handle is locked with the second connecting piece through the linkage piece; when the handle rotates relative to the first connecting piece along with the second connecting piece, locking formed by the handle and the second connecting piece through the linkage piece is relieved. By optimizing the unlocking mode and the locking structure, the operation convenience is improved, the safety is enhanced, and the mistaken touch risk is reduced.

Description

Technical Field

[0001] This application relates to the field of children's products technology, and in particular to a folding joint structure. Background Technology

[0002] In existing technologies, folding joints are widely used in products such as strollers, child seats, and infant carriers, with the core purpose of achieving portable storage. For example, child safety seats typically employ a front and rear frame structure to achieve folding storage and unfolding functionality. The front and rear frames are connected by a rotational mechanism to open and close, and are secured by a locking mechanism in the folding joint when unfolded, ensuring stability and safety during use. Current folding joint locking mechanisms mostly use a button-type unlocking design, where pressing a button releases the lock and allows folding or unfolding. However, this design still has the following drawbacks: High risk of accidental activation: The button-type unlocking mechanism may be accidentally unlocked due to accidental contact (such as during handling, collisions, or a child grasping and pressing), causing sudden folding and posing a safety hazard. Summary of the Invention

[0003] The purpose of this application is to provide a folding joint structure that improves ease of operation, enhances safety, and reduces the risk of accidental activation by optimizing the unlocking method and locking structure.

[0004] The technical solution of this application is: a folding joint structure, including a first connecting member and a second connecting member that are rotatably connected, a locking mechanism that can lock the two members when they are in the unfolded position, and the folding joint structure also includes a handle, which is rotatably disposed at the rotatable connection between the first connecting member and the second connecting member, and is linked to the locking mechanism through a linkage member.

[0005] The handle has a first working position and a second working position;

[0006] When the handle is in the first working position, the first connector and the second connector are in the unfolded state and locked by the locking mechanism;

[0007] When the handle is turned to the second working position, the drive linkage releases the locking mechanism from locking the first and second connecting parts; at the same time, the handle is locked to the second connecting part through the linkage.

[0008] When the handle rotates relative to the first connector as the second connector rotates, the lock formed between the handle and the second connector through the linkage is released.

[0009] As a preferred technical solution, the first connecting member and the second connecting member are rotatably connected through the first connecting seat and the second connecting seat; the locking mechanism includes a locking tooth disposed between the first connecting seat and the second connecting seat, a first resetting member for resetting the locking tooth, a first locking groove formed on the first connecting seat and into which the locking tooth can be locked, and a second locking groove formed on the second connecting seat and into which the locking tooth can be locked; when the locking mechanism is in the locked state, the locking tooth is simultaneously locked into the first locking groove and the second locking groove; when unlocking, the locking tooth is moved by the linkage member to disengage from the second locking groove.

[0010] As a preferred technical solution, the handle is disposed on the outside of the second connecting seat, and a second reset member is disposed between the two; the linkage member is disposed between the second connecting seat and the locking tooth, and a third reset member is disposed between the linkage member and the second connecting seat; the second connecting seat has an opening groove for the first protrusion of the linkage member to pass through and protrude; the handle has a guide groove that slides with the first protrusion; when the handle is rotated from the first working position to the second working position, the linkage member drives the locking tooth to move through the sliding engagement of the first protrusion and the guide groove to achieve unlocking.

[0011] As a preferred technical solution, the guide groove is an arc-shaped inclined groove with one end high (shallow) and the other end low (deep). The handle has a limiting groove for the first protrusion to lock into and is arranged at intervals with the guide groove. The guide groove and the limiting groove corresponding to the same first protrusion lock are arranged on the same circumference with the handle rotation axis as the center.

[0012] When the handle moves from the first working position to the second working position, the linkage component falls into the corresponding limiting groove through the sliding engagement between the first protrusion and the corresponding guide groove, and the transition plane sliding engagement between the high end of the guide groove and the corresponding limiting groove. At this time, the handle is locked to the second connecting component through the linkage component.

[0013] As a preferred technical solution, there are two first protrusions on the linkage component, and the two protrusions are arranged on different circumferences centered on the rotation axis of the linkage component; the guide groove and the limiting groove on the handle are two corresponding to the two first protrusions, and each limiting groove is respectively set on the radial side of the low (deep) end of the guide groove (the guide groove arranged on different circumferences centered on the rotation axis of the handle) that does not correspond to it.

[0014] As a preferred technical solution, the linkage component is further provided with a second protrusion, and the locking tooth has a guide slope that slides with the second protrusion.

[0015] When the handle is in the second working position, the second protrusion is located at the high end of the guide slope. During the rotation and retraction of the first connector relative to the second connector, when the second protrusion slides from the high end of the guide slope to its low end, the linkage, under the reset action of the third reset member, drives the linkage to move towards the locking tooth, causing its first protrusion to exit the corresponding limiting groove. At this time, the handle can rotate and retract relative to the first connector and the second connector respectively.

[0016] As a preferred technical solution, the left and right sides of the first connector and the second connector are rotatably connected by the first connecting seat and the second connecting seat, respectively. The rotatable connecting parts on both sides are respectively provided with the locking mechanism and the handle. Corresponding plug-in seats are formed on the handles on both sides, and a horizontally arranged auxiliary component is detachably installed between the plug-in seats on both sides.

[0017] Compared with the prior art, this application has the following advantages:

[0018] 1. This application unlocks by rotating a handle. The handle requires a specific rotation angle (such as 180°) to unlock. Compared with the linear pressing of a button, accidental touch (such as a child grasping or bumping into it) is less likely to trigger unlocking, making it safer.

[0019] 2. In this application, when the handle is turned to the second working position, it locks relative to the second connector while releasing the locking of the first connector and the second connector. This design keeps the handle in the unlocked position so as to ensure that the subsequent folding and closing of the first connector and the second connector is smoother.

[0020] 3. This application adopts a rotation unlocking design. A horizontally arranged auxiliary component (such as a tray auxiliary component) is detachably installed between the connecting seats of the two handles. Both sides can be unlocked at the same time by directly rotating the auxiliary component. It can be easily rotated and unlocked with one hand, which is especially suitable for one-handed operation when holding a baby. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. The drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0023] Figure 1 This is a three-dimensional structural diagram of the handle in the first working position in this application;

[0024] Figure 2 for Figure 1 A schematic diagram of the side structure;

[0025] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the middle AA section;

[0026] Figure 4 for Figure 1 A schematic diagram of the assembly structure of a one-sided rotating joint;

[0027] Figure 5 for Figure 1 A schematic diagram of the assembly structure at another angle of the rotating joint on one side;

[0028] Figure 6 for Figure 4 A three-dimensional structural diagram of the middle handle;

[0029] Figure 7 for Figure 5 A three-dimensional structural diagram of the central linkage component;

[0030] Figure 8 This is a three-dimensional structural diagram of the handle in the second working position in this application;

[0031] Figure 9 for Figure 8 A schematic diagram of the side structure;

[0032] Figure 10 for Figure 9 Schematic diagram of the cross-sectional structure of the middle BB section;

[0033] Figure 11 A three-dimensional structural diagram of the first and second connectors during the retraction process and when the lock between the handle and the second connector is released;

[0034] Figure 12 for Figure 11 A schematic diagram of the side structure;

[0035] Figure 13 for Figure 12 Schematic diagram of the cross-sectional structure of the middle CC section;

[0036] Figure 14 A three-dimensional structural diagram of the handle, the first connector, and the second connector during the retraction process;

[0037] Figure 15 This is a schematic diagram of the structure when the present application is installed on a stroller;

[0038] Figure 16 A schematic diagram of the structure when auxiliary components (plate auxiliary components) are installed on the handle sockets on both sides of this application.

[0039] Figure 17 for Figure 16 A schematic diagram of the structure when installed on a stroller.

[0040] Wherein: 1 is the first connecting member; 101 is the first connecting seat;

[0041] 2. Second connector; 201. Second connector seat; 202. Opening slot;

[0042] 3. Locking mechanism; 301. Locking tooth; 3011. Guide slope; 302. First reset component; 303. First locking groove; 304. Second locking groove;

[0043] 4. Handle; 401, 401a, 401b guide grooves; 402, 402a, 402b limit grooves; 403 plug socket; 404 operating handle;

[0044] 5 linkage components; 501, 501a, 501b first protrusions; 502 second protrusion;

[0045] 6. Second reset component;

[0046] 7. Third reset component;

[0047] 8. Auxiliary components. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It is understood that, without conflict, some technical means of the various embodiments described herein can be substituted for or combined with each other.

[0049] In the description of this application and the claims, the terms "first," "second," etc., are used only to distinguish the described objects and have no sequential or technical meaning. Therefore, objects specified with "first," "second," etc., may explicitly or implicitly include one or more of those objects. Furthermore, the words "one" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one, while "multiple" indicates not less than two.

[0050] In the description of this application and the claims, the terms "connection," "installation," "fixation," and "reception," unless otherwise specified, should be interpreted broadly. For example, "connection" can mean a separate connection or an integral connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean a non-detachable connection or a detachable connection. As another example, "reception" does not necessarily mean complete containment; this concept also includes the containment of a portion that protrudes externally. Those skilled in the art can understand the specific meaning of the aforementioned terms in this application based on the specific circumstances.

[0051] In the description of this application and the claims, if terms such as "above," "below," or "horizontal" indicate orientation or positional relationships based on the orientation or positional relationships shown in the drawings, they are only for the purpose of clearly and simply describing this application, and do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation. These directional terms are relative concepts used for relative description and clarification, and may change accordingly depending on the orientation of the components in the drawings. For example, if the device in the drawings is flipped, an element described as "below" other elements will be positioned "above" other elements.

[0052] In the description of this application specification and claims, the term "if" is generally interchangeable with "when," "at," "in response to determination," or "in response to detection," depending on the context.

[0053] In the description of this application and the claims, if there is a "direction" of motion, including motion with a directional component, the term "in direction" is not necessarily understood as motion only in that one direction. Those skilled in the art can understand the specific meaning of the aforementioned terms in this application according to the specific circumstances.

[0054] like Figures 1 to 17 As shown, a folding joint structure includes a first connecting member 1 and a second connecting member 2 that are rotatably connected. A locking mechanism 3 is provided between the first connecting member 1 and the second connecting member 2 that can lock both of them when in the unfolded position. The folding joint structure also includes a handle 4, which is rotatably disposed at the rotatable connection between the first connecting member 1 and the second connecting member 2, and is linked to the locking mechanism 3 through a linkage member 5.

[0055] The handle 4 has a first working position and a second working position;

[0056] When the handle 4 is in the first working position, the first connecting member 1 and the second connecting member 2 are in the unfolded state and locked by the locking mechanism 3. At this time, the first connecting member 1 and the second connecting member 2 cannot rotate relative to each other, while the handle 2 can rotate relative to the first connecting member 1 and the second connecting member 2.

[0057] When the handle 4 is turned to the second working position, the drive linkage 5 releases the locking mechanism 3 from locking the first connecting member 1 and the second connecting member 2; at the same time, the handle 4 is locked to the second connecting member 2 through the linkage 5; at this time, the handle 4 and the second connecting member 2 cannot rotate relative to each other, but they can rotate relative to the first connecting member 1.

[0058] When the handle rotates relative to the first connector as the second connector rotates, the lock formed between the handle and the second connector through the linkage is released.

[0059] In this embodiment, the first connector 1 and the second connector 2 are rotatably connected through the first connecting seat 101 and the second connecting seat 201.

[0060] In this embodiment, the locking mechanism 3 includes a locking tooth 301 disposed between the first connecting seat 101 and the second connecting seat 201, a first reset member 302 for resetting the locking tooth 301, a first locking groove 303 formed on the first connecting seat 101 and into which the locking tooth 301 can be locked, and a second locking groove 304 formed on the second connecting seat 201 and into which the locking tooth 301 can be locked. When the locking mechanism 3 is in the locked state, the locking tooth 301 simultaneously locks into the first locking groove 303 and the second locking groove 304. When unlocking, the locking tooth 301 is moved by the linkage member 5 to disengage from the second locking groove 304. Preferably, the locking tooth 301 is a gear with several teeth on its outer periphery; the first locking groove 303 and the second locking groove 304 are tooth grooves that engage with the gear.

[0061] In this embodiment, the handle 4 is located on the side of the second connecting seat 201 away from the first connecting seat 101, and a second reset member 6 is provided between the handle 4 and the second connecting seat 201; the linkage member 5 is located between the second connecting seat 201 and the locking tooth 301, and a third reset member 7 is provided between the linkage member 5 and the second connecting seat 201; the second connecting seat 201 has an opening groove 202 for the first protrusion 501 of the linkage member 5 to pass through and extend; the handle 4 has a guide groove 401 that slides with the first protrusion 501; when the handle 4 is rotated from the first working position to the second working position, the linkage member 5 drives the locking tooth 301 to move through the sliding engagement of the first protrusion 501 and the guide groove 401 to achieve unlocking.

[0062] In this embodiment, the guide groove 401 is an arc-shaped inclined groove with one end high (shallow) and the other end low (deep). The handle 4 has a limiting groove 402 for the first protrusion 501 to lock into and is spaced apart from the guide groove 401. The guide groove 401 and the limiting groove 402 corresponding to the same first protrusion 501 are arranged on the same circumference centered on the rotation axis of the handle. When unlocking, the linkage 5 pushes the locking tooth 301 to move a distance greater than the sum of the unlocking distance of the locking tooth 301 and the depth of the limiting groove 402. This design ensures that after the first protrusion 501 of the linkage 5 is locked into the limiting groove 402, the locking tooth 301 is still in the unlocked position.

[0063] To further improve operational stability, the linkage 5 preferably has two first protrusions 501, namely first protrusion 501a and first protrusion 501b, and the two (501a, 501b) are arranged on different circumferences centered on the rotation axis of the linkage 5; the handle 4 has two guide grooves 401 and two limiting grooves 402, corresponding to the two first protrusions 501a and 501b, respectively, namely guide groove 401a, guide groove 401b and limiting groove 402a, limiting groove 402b. Among them, guide groove 401a and limiting groove 402a are arranged on the same circumference centered on the rotation axis of the handle and correspond to the first protrusion 501a; guide groove 401b and limiting groove 402b are arranged on the same circumference centered on the rotation axis of the handle and correspond to the first protrusion 501b.

[0064] In this embodiment, each limiting groove 401 is respectively arranged on the radial side of the lower (deep) end of the guide groove 402 that does not correspond to it. The aforementioned "guide groove that does not correspond to it" refers to guide grooves arranged on different circumferences centered on the handle rotation axis. Specifically, as in this embodiment. Figures 4 to 7 As shown, the limiting groove 402a is disposed on the radial side of the low (deep) end of the guide groove 401b; the limiting groove 402b is disposed on the radial side of the low (deep) end of the guide groove 401a.

[0065] In this embodiment, a second protrusion 502 is formed on the side of the linkage 5 near the locking tooth 301, and the locking tooth 301 has a guide slope 3011 that slides with the second protrusion 502.

[0066] In this embodiment, preferably, the rotation axis of the handle 4 coincides with the axis of the rotational connection between the first connector 1 and the second connector 2.

[0067] In this embodiment, the first connecting member 1 is the front frame, and the second connecting member 2 is the rear frame. The rotating connecting portions on both sides of the first connecting member 1 (front frame) and the second connecting member 2 (rear frame) respectively have the locking mechanism 3 and a handle 4. Corresponding insertion seats 403 are formed on the handles 4 on both sides, and a horizontally arranged auxiliary component 8 is detachably installed between the two insertion seats 403, such as... Figure 16 and Figure 17 As shown. The auxiliary component 8 can be a plate accessory, etc. Because this application uses a rotation unlocking design, both sides can be unlocked simultaneously by directly rotating the auxiliary component 8. It can be easily rotated and unlocked with one hand, making it especially suitable for one-handed operation when holding a baby.

[0068] In this embodiment, when the handle 4 is in the first working position, its operating handle 404 is arranged downwards; when the handle 4 is in the second working position, its operating handle 404 is arranged upwards. This design ensures that when the first connecting member 1 and the second connecting member 2 are locked, the operating handle 404 is arranged downwards below the frame, providing better concealment and avoiding safety hazards caused by accidental operation. Furthermore, when unlocking, the operating handle 404 is arranged upwards and protrudes from the frame, making the folding operation more convenient; simply lifting the handle 4 allows the first connecting member 1 and the second connecting member 2 to be folded and closed under their own weight.

[0069] The working principle of this application is as follows:

[0070] like Figures 1 to 7 As shown, when the handle 4 is in the first working position, the first connecting member 1 and the second connecting member 2 are in the unfolded state and locked by the locking mechanism 3. At this time, the first connecting member 1 and the second connecting member 2 cannot rotate relative to each other, while the handle 4 can rotate relative to the first connecting member 1 and the second connecting member 2. When the locking mechanism 3 is in the locked state, the locking teeth 301 simultaneously lock into the first locking groove 303 of the corresponding first connecting seat 101 and the second locking groove 304 of the corresponding second connecting seat 201, thereby achieving rotational locking of both.

[0071] like Figures 8 to 10As shown, when the handle 4 rotates from the first working position to the second working position, the linkage 5, through the sliding engagement of the first protrusion 501 with the corresponding guide groove 401 and the transition plane sliding engagement between the high (shallow) end of the guide groove 401 and the corresponding limiting groove 402, falls into the corresponding limiting groove 402. At this time, the handle 4 is locked to the second connecting member 1 through the linkage 5. Simultaneously, the axially moving linkage 5 drives the locking tooth 301 to move and disengage it from the second locking groove 304, releasing the rotational lock of the first connecting seat 101 and the second connecting seat 201. Therefore, at this time, the handle 4 and the second connecting member 2 cannot rotate relative to each other, but they can rotate relative to the first connecting member 1. Furthermore, when the handle 4 is in the second working position, the second protrusion 502 is located at the high end of the guide slope 3011 (the side closer to the linkage).

[0072] like Figures 11 to 14 As shown, when the rotating connection between the second connecting piece 1 and the first connecting piece 2 is lifted by the handle 4 or the auxiliary component 8 between the two handles, the first connecting piece 2 will automatically rotate and retract relative to the second connecting piece 1 under its own weight. During the rotation and retraction process, when the second protrusion 502 slides from the high end of the guide slope 3011 (the side closer to the linkage 5) to its low end (the side farther from the linkage 5), the linkage 5, under the reset action of the third reset component 7, moves towards the locking tooth 301, causing its first protrusion 501 to exit the corresponding limiting groove 402. At this time, the lock between the handle 4 and the second connecting piece 2 is released, and the handle 4 can rotate and retract relative to the first connecting piece 1 and the second connecting piece 2 respectively. This allows the handle 4, the first connecting piece 1, and the second connecting piece 2 to be folded and retracted in the end.

[0073] This application unlocks by rotating handle 4. The handle 4 requires a specific rotation angle (such as 180°) to unlock. Compared with the linear pressing of the button, accidental touch (such as a child grasping or bumping into it) is less likely to trigger unlocking, making it safer.

[0074] In this application, when the handle 4 is rotated to the second working position, it simultaneously releases the locking of the first connector 1 and the second connector 2 while locking relative to the second connector 2. This design keeps the handle 4 in the unlocked position, ensuring smoother folding and retraction of the first connector 1 and the second connector 4. Furthermore, in the above embodiment, when the frame has handles on both sides but no auxiliary component 8 is provided between the two handles, the pause design of the handle 4 (keeping it in the unlocked position) facilitates unlocking one side at a time with one hand.

[0075] As a preferred embodiment of this application, in the description of this specification, the reference to terms such as "preferred," "optional," etc., means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] The above embodiments are only used to illustrate the detailed solutions of this application. This application is not limited to the above detailed solutions, that is, it does not mean that this application must rely on the above detailed solutions to be implemented. Those skilled in the art should understand that any improvements to this application, equivalent substitutions of the raw materials of the product of this application, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of this application.

Claims

1. A folding joint structure comprising first and second link members connected in rotation, a locking mechanism being provided between the first and second link members to enable locking of both in an unfolded position, characterised in that: The folding joint structure further comprises a handle, which is rotationally arranged at the rotation connection between the first connecting member and the second connecting member and is in linkage with the locking mechanism through a linkage member; The handle has a first working position and a second working position; When the handle is in the first working position, the first connecting member and the second connecting member are in an unfolded state and are locked by the locking mechanism; When the handle is turned to the second working position, the linkage member drives the locking mechanism to unlock the first connecting member and the second connecting member; meanwhile, the handle is locked with the second connecting member through the linkage member; When the handle is turned with the second connecting member relative to the first connecting member, the locking between the handle and the second connecting member through the linkage member is released.

2. The foldable joint structure of claim 1, wherein: The first connecting member and the second connecting member are rotationally connected through a first connecting seat and a second connecting seat; the locking mechanism comprises a locking tooth arranged between the first connecting seat and the second connecting seat, a first reset member for resetting the locking tooth, a first locking groove formed on the first connecting seat and capable of locking the locking tooth, and a second locking groove formed on the second connecting seat and capable of locking the locking tooth; when the locking mechanism is in a locked state, the locking tooth is locked in the first locking groove and the second locking groove at the same time; when the locking mechanism is unlocked, the linkage member drives the locking tooth to move so as to make the locking tooth exit the second locking groove.

3. The foldable joint structure of claim 2, wherein: The handle is arranged outside the second connecting seat and is provided with a second reset member between the handle and the second connecting seat; the linkage member is arranged between the second connecting seat and the locking tooth, and a third reset member is arranged between the linkage member and the second connecting seat; an opening groove is formed on the second connecting seat and is capable of allowing a first protrusion of the linkage member to pass through and extend out; the handle is provided with a guide groove capable of slidingly cooperating with the first protrusion; when the handle is turned from the first working position to the second working position, the linkage member drives the locking tooth to move through the sliding cooperation between the first protrusion and the guide groove, so as to realize unlocking.

4. The foldable joint structure of claim 3, wherein: The guide groove is an arc-shaped inclined groove with one end being high and the other end being low; the handle is provided with a limiting groove capable of locking the first protrusion and being arranged in a spaced manner with the guide groove; the guide groove and the limiting groove corresponding to the same first protrusion are arranged on the same circle with the rotation center of the handle as the center; When the handle is turned from the first working position to the second working position, the linkage member falls into the corresponding limiting groove through the sliding cooperation between the first protrusion and the corresponding guide groove and the sliding cooperation between the high end of the guide groove and the corresponding limiting groove, so that the handle is locked with the second connecting member through the linkage member.

5. The foldable joint structure of claim 4, wherein: The first protrusion on the linkage member has two protrusions and the two protrusions are arranged on different circles with the rotation center of the linkage member as the center; the guide groove and the limiting groove on the handle are two grooves corresponding to the two first protrusions respectively; each limiting groove is arranged on a radial side not corresponding to the low end of the corresponding guide groove.

6. The foldable joint structure of claim 4, wherein: The linkage member is further provided with a second protrusion, and the locking tooth is provided with a guide inclined surface capable of slidingly cooperating with the second protrusion; When the handle is in the second working position, the second protrusion is located at the high end of the guide slope; during the folding process of the first connecting member relative to the second connecting member, when the second protrusion slides from the high end of the guide slope to the low end thereof, the linkage member is driven to displace the locking tooth under the resetting action of the third resetting member, so that the first protrusion exits the corresponding limiting slot; at this time, the handle can be folded relative to the first connecting member and the second connecting member, respectively.

7. The foldable joint structure of claim 2, wherein: The left and right sides of the first connecting member and the second connecting member are rotatably connected through the first connecting seat and the second connecting seat, respectively, and the two sides of the rotatable connecting part are provided with the locking mechanism and the handle, respectively; the two handles are formed with corresponding plug-in seats, and a transversely arranged auxiliary component is detachably mounted between the two plug-in seats.

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