Folding joint

Abstract

The utility model discloses a folding joint which comprises a first connecting piece, a second connecting piece and a third connecting piece which are rotationally connected, a locking mechanism is arranged between the first connecting piece and the second connecting piece, and a locking block capable of controlling whether the third connecting piece and the second connecting piece are locked or not through movement is arranged between the third connecting piece and the second connecting piece. A movable part capable of rotating along with the first connecting part and moving relative to the third connecting part is arranged between the third connecting part and the locking block, the movable part and the locking block are provided with a first inclined surface and a second inclined surface which correspond to each other, and the third connecting part is provided with an unlocking part capable of pushing the movable part to move; when the folding joint is unfolded for use, the third connecting piece can be unlocked independently through the unlocking piece, so that whether the third connecting piece is opened or not and the opening angle can be adjusted; when the folding joint is folded, locking of the third connecting piece can be synchronously relieved through rotating and folding of the first connecting piece and the second connecting piece when the locking mechanism is unlocked, so that folding operation is more convenient, and single-hand unlocking can be achieved.

Description

Technical Field

[0001] The utility model relates to a children's appliance, in particular to a folding joint for the children's appliance. Background Art

[0002] In the prior art, the folding joints used in child products (such as child sleepers and strollers) typically include a first, second, and third connecting member that are rotatably connected. When the child product is unfolded and locked, the first, second, and third connecting members are generally kept in the unfolded state, and none of them can rotate. If one of the connecting members needs to be rotated while the other two are unfolded and locked, two locking mechanisms are often required, and there is no linkage between the two locking mechanisms. This not only makes the overall structure more complex and increases production costs, but also makes folding more inconvenient, requiring the unlocking of different locking mechanisms in sequence, making single-handed unlocking and folding impossible. Summary of the Invention

[0003] The purpose of the utility model is to provide a folding joint structure which is novel in structure and convenient in operation.

[0004] The technical solution of the utility model is: a folding joint, comprising a first connecting member, a second connecting member and a third connecting member that are rotatably connected, a locking mechanism is provided between the first connecting member and the second connecting member, a locking block is provided between the third connecting member and the second connecting member, and the locking of the two can be controlled by movement; a movable member is provided between the third connecting member and the second connecting member, which can rotate with the first connecting member and can move relative to the third connecting member, the movable member and the locking block have corresponding first and second inclined surfaces, and the third connecting member has an unlocking member that can be pressed to push the movable member to move;

[0005] When the folding joint is in an unfolded state, the first connecting member and the second connecting member are locked by a locking mechanism, and the third connecting member and the second connecting member are locked by a locking block;

[0006] When the third connecting member needs to be rotated, the unlocking member can drive the movable member and the locking block to move to release the lock between the third connecting member and the second connecting member; or after the locking mechanism is unlocked, when the first connecting member is rotated and retracted relative to the second connecting member, the movable member rotates with the first connecting member, and under the cooperation of the inclined surface, the locking block moves to release the lock between the third connecting member and the second connecting member.

[0007] As a preferred technical solution, the locking mechanism includes a gear that can simultaneously lock into the first tooth groove of the first connecting member and the second tooth groove of the second connecting member, and an unlocking mechanism that can drive the gear to move axially. The unlocking mechanism releases the lock of the first connecting member and the second connecting member by driving the gear to move axially.

[0008] As a preferred technical solution, the third connecting member and the second connecting member have a first card slot and a second card slot for the locking block to be locked into, the second card slot and the second tooth groove are respectively located on both sides of the rotating part of the second connecting member, and the middle parts of the two are connected; a spring is arranged between the locking block and the gear.

[0009] As a preferred technical solution, the unlocking member is an unlocking button, the rotating connection of the third connecting member has a button groove for installing the unlocking member, the outer end of the unlocking member is exposed to form a pressing portion, and the inner side of the unlocking member has an extended barb that extends axially and extends into the first slot; when the unlocking member is pressed, the extended barb is squeezed inward and pushes the movable member to move axially inward.

[0010] As a preferred technical solution, the unlocking mechanism includes a linkage block coaxially arranged with the gear and axially movable, and an unlocking block arranged in the first tooth groove and radially sliding relative to it, the unlocking block cooperates with the inclined surface of the linkage block, and the first connecting member is provided with an unlocking operating component, which is connected to the unlocking block through a traction rope and can drive the unlocking block to slide. When the unlocking block slides in the unlocking direction, it drives the linkage block axially through the inclined surface cooperation, and the linkage block pushes the gear and causes the gear to exit the first tooth groove and completely enter the second tooth groove, thereby releasing the lock of the first connecting member and the second connecting member.

[0011] As a preferred technical solution, the rotating connections of the first connecting member, the second connecting member and the third connecting member are coaxially connected from the inside to the outside; the first connecting member has an axially extending connecting shaft, which passes through the unlocking block, the linkage block, the gear, the second connecting member, the locking block, the movable member and the third connecting member from the inside to the outside; the cross-section of the connecting shaft is non-circular, the unlocking block has a guide groove for the sliding of the connecting shaft, the gear and the locking block both have a circular shaft hole that can be axially moved relative to the connecting shaft and can be rotated relative to the connecting shaft, and the linkage block and the movable member both have a non-circular shaft hole that can be axially moved relative to the connecting shaft and cannot be rotated relative to the connecting shaft.

[0012] As a preferred technical solution, the locking block includes a disc-shaped portion and a limiting protrusion arranged on the outer circumference of the disc-shaped portion; the second slot is a slot structure consistent with the outer shape of the locking block, and the first slot includes a disc groove portion corresponding to the disc-shaped portion of the locking block and multiple groups of protrusion groove portions corresponding to the limiting protrusion and arranged on the outer circumference of the disc groove portion and communicated with it; the locking block can realize the gear adjustment of the third connecting member through the clamping engagement of the limiting protrusion with different groups of protrusion groove portions.

[0013] Compared with the prior art, the present application has the following advantages: the structural design of the utility model is novel. When the folding joint is unfolded for use, the limit lock on the third connecting member can be released by the unlocking member alone, so as to adjust whether the third connecting member is opened or not and the opening angle; when the folding joint is folded, the limit lock on the third connecting member can be released synchronously by rotating and retracting the first connecting member relative to the second connecting member when the locking mechanism is unlocked. The entire folding joint can be unlocked without the need to operate the unlocking member separately. This design makes the folding operation simpler and faster, and can be unlocked with one hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification so as to facilitate understanding and reading by those familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and objectives that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed in the present invention.

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the joint of the upper frame of the sleeping basket of the utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the side structure;

[0018] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of AA;

[0019] Figure 4 for Figure 3 Schematic diagram of the partially enlarged structure;

[0020] Figure 5 for Figure 1 Schematic diagram of the assembly structure at a certain angle;

[0021] Figure 6 for Figure 5 Schematic diagram of the partially enlarged structure;

[0022] Figure 7 for Figure 1 Schematic diagram of the assembly structure at another angle;

[0023] Figure 8 for Figure 7 Schematic diagram of the partially enlarged structure;

[0024] Figure 9 for Figure 1 A schematic diagram of the side structure of the third connecting member after adjusting the use angle;

[0025] Figure 10 This is a schematic diagram of the structure of the utility model after folding;

[0026] Figure 11 This is a schematic diagram of the three-dimensional structure of the joints of the utility model for children's strollers.

[0027] Wherein: 1 first connecting member; 101 connecting shaft;

[0028] 2 second connecting member; 201 second slot;

[0029] 3 third connecting member; 301 first card slot; 3011 disc slot; 3012 convex slot; 302 button slot;

[0030] 4 locking mechanism; 401 first tooth groove; 402 second tooth groove; 403 gear; 404 linkage block; 405 unlocking block; 406 unlocking operation component;

[0031] 5 locking block; 501 second inclined surface; 502 disc-shaped portion; 503 limiting protrusion;

[0032] 6 movable part; 601 first inclined surface;

[0033] 7 unlocking member; 701 extension barb;

[0034] 8 springs. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. It is understood that, in the absence of conflict, some technical means of the various embodiments described herein can be replaced or combined with each other.

[0036] In the description and claims of this application, the terms "first," "second," etc., if used, are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. Thus, a term defined as "first," "second," etc. may explicitly or implicitly include one or more of such objects. Furthermore, "a," "an," and similar terms do not indicate a limitation on quantity, but rather indicate the presence of at least one, and "plurality" means at least two.

[0037] In the description of the specification and claims of this application, if there are terms such as "connect", "install", "fix", "accommodate", etc., unless otherwise specified, they should be understood in a broad sense. For example, "connection" can be a separate connection or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a non-detachable connection or a detachable connection. For another example, "accommodate" does not necessarily mean complete accommodation of the entire body. This concept also includes the accommodation of a part that protrudes from the outside. For those skilled in the art, the specific meanings of the aforementioned terms in this application can be understood according to the specific circumstances.

[0038] In the description and claims of this application, if there are terms such as "upper," "lower," and "horizontal" indicating orientations or positional relationships, these are based on the orientations or positional relationships shown in the accompanying drawings. They are used only to facilitate a clear and simplified description of this application and are not intended to indicate or imply that the elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. These directional terms are relative concepts and are used for relative description and clarification. They may change accordingly depending on the orientation of the components in the drawings. For example, if the device in the figure is turned over, elements described as "below" other elements would be positioned "above" the other elements.

[0039] In the description of the specification and claims of this application, if the term "if" is present, it can generally be interchanged with "when" or "at" or "in response to determining" or "in response to detecting", depending on the context.

[0040] In the description of the specification and claims of this application, if there is a "direction" of movement, including movement with a directional component, the term "in the direction" is not necessarily understood as movement only in that one direction. For those skilled in the art, the specific meaning of the aforementioned terms in this application can be understood according to the specific circumstances.

[0041] like Figures 1 to 11 As shown, a folding joint includes a first connecting member 1, a second connecting member 2 and a third connecting member 3 that are rotatably connected, a locking mechanism 4 is provided between the first connecting member 1 and the second connecting member 2, a locking block 5 is provided between the third connecting member 3 and the second connecting member 2, and the locking block 5 can be used to control whether the two are locked or not through axial movement, a movable member 6 is provided between the third connecting member 3 and the second connecting member 2, which can rotate with the first connecting member 1 and can move axially relative to the third connecting member 3, the movable member 6 and the locking block 5 have corresponding first inclined surfaces 601 and second inclined surfaces 501, and the third connecting member 3 has an unlocking member 7 that can be pressed and can push the movable member 6 to move axially.

[0042] In this embodiment, the locking mechanism 4 includes a gear 403 that can be simultaneously locked into the first tooth groove 401 of the first connecting member 1 and the second tooth groove 402 of the second connecting member 2, and an unlocking mechanism that can drive the gear 403 to move axially. The unlocking mechanism releases the lock of the first connecting member 1 and the second connecting member 2 by driving the gear 403 to move axially outward so that the gear 403 exits the first tooth groove 401 and completely enters the second tooth groove 402.

[0043] In which, the unlocking mechanism includes a linkage block 404 which is coaxially arranged with the gear 403 and can move axially, and an unlocking block 405 which is arranged in the first tooth groove 401 and can slide radially relative to it. The unlocking block 405 cooperates with the inclined surface of the linkage block 404, and the first connecting member 1 is provided with an unlocking operation component 406. The unlocking operation component 406 is connected to the unlocking block 405 through a traction rope and can drive the unlocking block 405 to slide. When the unlocking block 405 slides in the unlocking direction, it drives the linkage block 404 to move axially through the inclined surface cooperation. The linkage block 404 pushes the gear 403 and causes the gear 403 to exit the first tooth groove 401 and completely enter the second tooth groove 402, thereby releasing the lock of the first connecting member 1 and the second connecting member 2.

[0044] In this embodiment, the unlocking operation component 406 is preferably a rotating unlocking handle component or a pressing unlocking component. Since the unlocking operation component 406 is diverse in the art, it can also be other unlocking components that can drive the unlocking block to slide, so no specific details or limitations are given here.

[0045] In this embodiment, the unlocking member 7 is preferably an unlocking button, and the rotating connection of the third connecting member 3 has a button groove 302 for installing the unlocking member 7. The outer end of the unlocking member 7 is exposed to form a pressing portion, and the inner side of the unlocking member 7 has an extended hook 701 that extends axially and extends into the first slot; when the unlocking member 7 is pressed, the extended hook 701 is squeezed inward and pushes the movable member 6 to move axially inward.

[0046] In this embodiment, the third connecting member 3 and the second connecting member 2 have a first card slot 301 and a second card slot 201 for the locking block 5 to be locked into, the second card slot 201 and the second tooth groove 401 are respectively located on both sides of the rotating part of the second connecting member 2, and the middle parts of the two are connected; a spring 8 is arranged between the locking block 5 and the gear 403.

[0047] In this embodiment, the rotating connections of the first connecting member 1, the second connecting member 2 and the third connecting member 3 are coaxially connected from the inside to the outside; the first connecting member 1 has an axially extending connecting shaft 101, and the connecting shaft 101 passes through the unlocking block 405, the linkage block 404, the gear 403, the second connecting member 2, the locking block 5, the movable member 6 and the third connecting member 3 from the inside to the outside; the cross-section of the connecting shaft 101 is non-circular, the unlocking block 405 has a guide groove for the connecting shaft 101 to slide, the gear 403 and the locking block 5 both have circular shaft holes that can be moved axially relative to the connecting shaft 101 and can rotate relative to the connecting shaft 101, and the linkage block 404 and the movable member 6 both have non-circular shaft holes that can be moved axially relative to the connecting shaft 101 and cannot rotate relative to the connecting shaft 101.

[0048] In this embodiment, the locking block 5 includes a disc-shaped portion 502 and a limiting protrusion 503 arranged on the outer periphery of the disc-shaped portion 502; the second inclined surface 501 is formed on the outer surface of the disc-shaped portion 502; the second card groove 201 is a groove structure consistent with the appearance of the locking block 5, and the first card groove 301 includes a disc groove portion 3011 corresponding to the disc-shaped portion 502 of the locking block 5 and a plurality of groups of protrusion groove portions 3012 corresponding to the limiting protrusion 503 and arranged on the outer periphery of the disc groove portion 3011 and communicated with it; the locking block 5 can realize the gear adjustment of the third connecting member 3 through the snap-fitting of the limiting protrusion 503 with different groups of protrusion groove portions 3012, so as to adjust the opening angle of the third connecting member 3.

[0049] The working principle of this utility model is:

[0050] When the folding joint is in the unfolded use state, the first connecting member 1 and the second connecting member 2 are unfolded and locked by the locking mechanism 4, and the third connecting member 3 and the second connecting member 2 are locked by the locking block 5 which is simultaneously clamped in the first clamping groove 301 and the second clamping groove 201. At this time, the third connecting member 3 remains in the unfolded position and cannot rotate relative to the unfolded first connecting member 1 and the second connecting member 2; when the third connecting member 3 needs to be rotated, the unlocking member 7 can drive the movable member 6 to move axially inward, and push the locking block 5 to move axially inward, so that it exits the first clamping groove 301 and releases the lock between the third connecting member 3 and the second connecting member 2. At this time, the third connecting member 3 can be rotated at will to adjust whether the third connecting member 3 is opened or not and the opening angle of the third connecting member 3.

[0051] When the folding joint needs to be folded, the following folding and retracting operation method is preferred:

[0052] First, the unlocking operation component 406 is unlocked. The unlocking operation component 406 drives the unlocking block 405 to slide radially through the traction rope. When the unlocking block 405 slides in the unlocking direction, the inclined surface cooperates with the linkage block 404 to drive the axial movement of the linkage block 404. The linkage block 404 pushes the gear 403 and causes the gear 403 to exit the first tooth groove 401 and fully enter the second tooth groove 402, thereby releasing the lock of the first connecting member 1 and the second connecting member 2. At this time, the locking block 5 does not move and is still in the locked position with the third connecting member 3.

[0053] Then, the first connecting member 1 is rotated so as to be retracted relative to the second connecting member 2. At this time, the movable member 6 rotates with the first connecting member 1, and under the cooperation of the first inclined surface 601 and the second inclined surface 501, the locking block 5 moves axially inward to exit the first slot 301 and release the lock between the third connecting member 3 and the second connecting member 2.

[0054] Finally, the third connecting member 3 is rotated and folded relative to the first connecting member 1 and the second connecting member 2 to complete the folding and folding of the entire joint.

[0055] The utility model has a novel structural design. When the folding joint is unfolded for use, the limit lock of the third connecting member 3 can be released by the unlocking member 7 alone, so as to adjust whether the third connecting member 3 is opened or not and the opening angle of the third connecting member 3; when the folding joint is folded, the lock of the third connecting member 3 can be synchronously released by rotating and retracting the first connecting member 1 relative to the second connecting member 2 when the locking mechanism 4 is unlocked, and the entire folding joint can be unlocked without additionally operating the unlocking member 7. This design makes the folding operation simpler and faster, and can be unlocked with one hand.

[0056] When the folding joint needs to be folded, the following folding and collapsing operations can also be performed:

[0057] First, the unlocking member 7 is pressed to push the movable member 6 axially inward, thereby driving the locking block 5 axially inward, so that it exits the first engaging groove 301 and releases the lock between the third connecting member 3 and the second connecting member 2. At this time, the gear 403 does not move, and the spring 8 is in a compressed state, rotating the third connecting member 3 to the position of the first connecting member 1;

[0058] Then, the unlocking operation component 406 is unlocked. The unlocking operation component 406 drives the unlocking block 405 to slide radially through the traction rope. When the unlocking block 405 slides in the unlocking direction, it drives the linkage block 404 to move axially through the inclined surface. The linkage block 404 pushes the gear 403 and causes the gear 403 to exit the first tooth groove 401 and completely enter the second tooth groove 402, thereby releasing the lock of the first connecting member 1 and the second connecting member 2; at this time, the locking block 5 is misaligned with the first engaging groove 301 of the third connecting member 3, so the locking block 5 does not move and is still in the unlocked position with the third connecting member 3;

[0059] Finally, the first and third connectors 1 and 3 are rotated and retracted relative to the second connector 2, completing the folding and retraction of the entire joint. As the first connector 1 rotates and retracts relative to the second connector 2, the movable member 6 rotates with the first connector 1, but the locking block 5 remains stationary. Therefore, the first inclined surface 601 cooperates with the second inclined surface 501 to cause the movable member 6 to move axially outward.

[0060] Compared with the preferred folding and folding operation mode of the above-mentioned utility model, it is necessary to press the unlocking part first, and then the overall folding and folding can be achieved by changing the rotation order of the parts.

[0061] like Figures 1 to 10 As shown, this folding joint structure can be used on a child sleeping basket that can be folded forward and backward. The first connecting member 1 is the front rod of the upper frame, the second connecting member 2 is the rear rod of the upper frame, and the third connecting member 3 is the canopy rod.

[0062] like Figure 11 As shown, the folding joint structure can also be used for the push rod joint of a child stroller, wherein the first connecting member 1 is an upper push rod, the second connecting member 2 is a lower push rod, and the third connecting member 3 is a canopy rod.

[0063] In addition, this folding joint structure can also be used for the front armrest joint of a stroller, or different folding parts of other children's toys. Since the use of this folding joint is conceivable by staff in this technical field, it will not be specifically described or limited here.

[0064] In the description of this specification, the use of terms such as "preferred" or "optional" as preferred embodiments of the present invention indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations 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 any one or more embodiments or examples.

[0065] The above embodiments are merely illustrative of the detailed embodiments of the present invention. The present invention is not limited to the detailed embodiments described above, nor does it necessarily rely on the detailed embodiments to be implemented. Those skilled in the art will appreciate that any improvements to the present invention, equivalent replacements of raw materials for the products of the present invention, addition of auxiliary ingredients, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A folding joint comprising a first connecting member, a second connecting member, and a third connecting member that are rotatably connected, characterized in that: A locking mechanism is provided between the first connecting member and the second connecting member, a locking block is provided between the third connecting member and the second connecting member, and the locking block can be controlled by movement to lock the two. A movable member is provided between the third connecting member and the second connecting member, which can rotate with the first connecting member and can move relative to the third connecting member. The movable member and the locking block have corresponding first and second inclined surfaces. The third connecting member has an unlocking member that can be pressed to push the movable member to move. When the folding joint is in an unfolded state, the first connecting member and the second connecting member are locked by a locking mechanism, and the third connecting member and the second connecting member are locked by a locking block; When the third connecting member needs to be rotated, the unlocking member can drive the movable member and the locking block to move to release the lock between the third connecting member and the second connecting member; or after the locking mechanism is unlocked, when the first connecting member is rotated and retracted relative to the second connecting member, the movable member rotates with the first connecting member, and under the cooperation of the inclined surface, the locking block moves to release the lock between the third connecting member and the second connecting member.

2. A folding joint according to claim 1, characterized in that: The locking mechanism includes a gear that can be locked into the first tooth groove of the first connecting member and the second tooth groove of the second connecting member at the same time, and an unlocking mechanism that can drive the gear to move axially. The unlocking mechanism releases the lock of the first connecting member and the second connecting member by driving the gear to move axially.

3. A folding joint according to claim 2, characterized in that: The third connecting member and the second connecting member have a first card slot and a second card slot for the locking block to be locked into. The second card slot and the second tooth groove are respectively located on both sides of the rotating part of the second connecting member, and the middle parts of the two are connected; a spring is arranged between the locking block and the gear.

4. A folding joint according to claim 3, characterized in that: The unlocking member is an unlocking button, and the rotating connection of the third connecting member has a button groove for installing the unlocking member. The outer end of the unlocking member is exposed to form a pressing portion, and the inner side of the unlocking member has an extended hook that extends axially and extends into the first slot; when the unlocking member is pressed, the extended hook squeezes inward and pushes the movable member to move axially inward.

5. The folding joint according to claim 2, characterized in that: The unlocking mechanism includes a linkage block that is coaxially arranged with the gear and can move axially, and an unlocking block that is arranged in the first tooth groove and can slide radially relative to it. The unlocking block cooperates with the inclined surface of the linkage block. An unlocking operating component is provided on the first connecting member. The unlocking operating component is connected to the unlocking block through a traction rope and can drive the unlocking block to slide. When the unlocking block slides in the unlocking direction, it drives the linkage block to move axially through the inclined surface. The linkage block pushes the gear and causes the gear to exit the first tooth groove and completely enter the second tooth groove, thereby releasing the lock of the first connecting member and the second connecting member.

6. The folding joint according to claim 5, characterized in that: The rotating connections of the first connecting member, the second connecting member and the third connecting member are coaxially connected from the inside to the outside; the first connecting member is provided with an axially extending connecting shaft, which passes through the unlocking block, the linkage block, the gear, the second connecting member, the locking block, the movable member and the third connecting member from the inside to the outside; the cross-section of the connecting shaft is non-circular, the unlocking block has a guide groove for the sliding of the connecting shaft, the gear and the locking block both have a circular shaft hole that can be axially moved relative to the connecting shaft and can be rotated relative to the connecting shaft, and the linkage block and the movable member both have a non-circular shaft hole that can be axially moved relative to the connecting shaft but cannot be rotated relative to the connecting shaft.

7. The folding joint according to claim 3, characterized in that: The locking block includes a disc-shaped portion and a limiting protrusion arranged on the outer circumference of the disc-shaped portion; the second slot is a slot structure consistent with the outer shape of the locking block, and the first slot includes a disc groove portion corresponding to the disc-shaped portion of the locking block and multiple groups of protrusion groove portions corresponding to the limiting protrusion and arranged on the outer circumference of the disc groove portion and communicated with it; the locking block can realize the gear adjustment of the third connecting member through the clamping engagement of the limiting protrusion with different groups of protrusion groove portions.

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