Joint structure for folding bicycle

Abstract

The utility model discloses a joint structure for a folding bicycle, which relates to the field of mechanical joints, and adopts the technical scheme that the joint structure comprises a rotating base, an armrest turntable, a backup plate rotating ring and a seat plate turntable which are sequentially arranged from the outer end to the inner end of a rotating shaft; the rotating base, the armrest rotating disc, the backup plate rotating ring and the seat plate rotating disc are respectively and rotationally matched; the base cavity groove and the handrail outer cavity groove are folded to form an outer lock cavity; a first driving piece and a first locking piece are distributed in the outer lock cavity from outside to inside; and a first spring is arranged between the first driving piece and the base cavity groove. The seat plate, the backrest and the armrests can be rapidly folded and unfolded relative to the base, the structure of the seat plate, the backrest and the armrests can be well locked in the folding and unfolding process, and angle locking is more stable.

Description

Technical Field

[0001] This utility model relates to the field of mechanical joints, and in particular to joint structures for folding vehicles. Background Technology

[0002] There are many joint structures in fields such as folding strollers. In order to facilitate unfolding and storage, the current related structures, such as the lockable handle joint for folding strollers disclosed in the patent document with announcement number CN102336211A, use a spring pin to fix the inner shaft pin. Although this solution can be adjusted for unfolding and storage, the angle between the two is locked by only one spring pin, which is too weak. The spring pin can be easily cut off with a little force. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a folding vehicle joint structure that enables the seat, backrest, and armrests to be quickly folded and unfolded relative to the base, and can effectively lock the structure during the folding and unfolding process, making the angle locking more stable.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a folding vehicle joint structure, including a rotating base, an armrest turntable, a backrest turntable and a seat turntable arranged sequentially from the outer end to the inner end of the rotating shaft; the rotating base, armrest turntable, backrest turntable and seat turntable are rotatably coordinated respectively;

[0005] The inner surface of the rotating base is provided with a base cavity groove;

[0006] The outer surface of the handrail turntable is provided with an outer handrail cavity groove;

[0007] The base cavity and the armrest outer cavity close together to form an outer locking cavity;

[0008] The outer locking cavity has a first locking element and a first driving element distributed from the outside to the inside;

[0009] The first driving member is located in the outer cavity groove of the armrest, and the first driving member can slide axially relative to the outer cavity groove of the armrest but cannot rotate circumferentially;

[0010] The sidewall of the outer locking cavity is axially provided with a first guide member from the base cavity groove to the armrest outer cavity groove. The first locking member can slide axially relative to the outer locking cavity through the first guide member but cannot rotate circumferentially. The first guide member includes a first outer locking guide section located in the base cavity groove and a second outer locking guide section located in the armrest outer cavity groove.

[0011] A first spring is provided between the first locking member and the base cavity, and the first spring pushes the first locking member and the first driving member to slide towards the inner end of the outer locking cavity;

[0012] During the rotation of the backplate, the first driving member is pushed to slide towards the outer end of the rotating shaft, so that the first locking member is adapted to the first outer lock guide section alone or to both the first outer lock guide section and the second outer lock guide section at the same time.

[0013] The rotating base, armrest turntable, backrest turntable, and seat turntable rotate and cooperate, allowing for adjustment of their relative angles and facilitating folding and storage. The outer locking cavity is equipped with a first guide, enabling the first locking member to slide axially through the guide. If the first locking member is located solely in the base cavity, relative rotation between the armrest turntable and the rotating base is possible. However, if the first locking member is located in both the armrest outer cavity and the base cavity, due to the presence of the first guide, the first locking member can only slide axially within both the armrest outer cavity and the base cavity, preventing circumferential rotation. Therefore, relative rotation between the armrest turntable and the rotating base is impossible in this case.

[0014] The specific state of the first locking member is determined by the first driving member and the first spring. When the first driving member provides thrust to push the first locking member, the first locking member only fits into the base cavity. When the first driving member does not provide thrust, the first locking member, pushed by the first spring, fits into both the first and second outer locking guide sections simultaneously. Using the first locking member to determine the angle between the two sections provides better stability.

[0015] Preferably, the first guide member is a first guide limiting groove disposed on the side wall of the outer locking cavity, and the first locking member is provided with a first guide limiting tooth that slides and adapts to the first guide limiting groove. This ensures that the first locking member can only slide axially and cannot rotate circumferentially with the outer cavity groove of the armrest and the cavity groove of the base.

[0016] Preferably, a guide post is axially arranged on the outer locking cavity. The guide post can further improve the stability of the first driving member and the first locking member during the sliding process within the outer locking cavity.

[0017] Preferably, the side wall of the outer cavity groove of the handrail is provided with an outer locking groove, the outer locking groove including a first outer locking section and a second outer locking section, the first outer locking section being located on the outer end side of the rotating shaft relative to the second outer locking section;

[0018] The inner end face of the first driving member is provided with a first single inclined surface driving tooth corresponding to the outer locking groove, and the first single inclined surface driving tooth slides axially with the outer locking groove.

[0019] The inner surface of the handrail turntable is provided with a locking protrusion. The outer wall of the locking protrusion includes a first protrusion section and a second protrusion section from the outer end to the inner end. The first protrusion section is located outside the second outer locking section, and the bottom of the groove of the second outer locking section passes through the outer wall of the first protrusion section.

[0020] The outer wall of the locking boss is rotatably fitted with the back plate rotating ring, and the inner edge of the outer end of the back plate rotating ring is provided with a first arc-shaped unlocking groove corresponding to the first outer locking segment.

[0021] When the first arc-shaped unlocking groove coincides with the second outer locking section, the first single-sloping drive tooth is located in the second outer locking section, and the first single-sloping drive tooth extends to the first arc-shaped unlocking groove through the second outer locking section. At this time, the first locking member is simultaneously adapted to the first outer locking guide section and the second outer locking guide section.

[0022] When the backrest rotates relative to the armrest turntable, and the first guide member of the outer cavity groove of the armrest and the cavity groove of the base is aligned, the end slope of the first arc-shaped unlocking groove will push the first single-slope driving tooth to move to the first outer locking section, and the first driving member will push the first locking member to adapt to the first outer locking guide section.

[0023] By rotating the backrest, the first arc-shaped unlocking groove and the first single-sloping surface drive tooth are made to coincide or stagger. Under the push of the end slope of the first arc-shaped unlocking groove and the first spring, the first locking member is controlled to be located only in the base cavity groove or simultaneously in the armrest outer cavity groove and the base cavity groove.

[0024] Preferably, when the rotating base, armrest turntable and backrest plate are in the folded state, the first arc-shaped unlocking groove and the second outer locking section are misaligned. The end slope of the first arc-shaped unlocking groove pushes the first single-slope driving tooth to move to the first outer locking section. The first driving member pushes the first locking member to move to the outer end of the rotating shaft, so that the first locking member is only adapted to the first outer locking guide section.

[0025] The backrest rotates relative to the armrest turntable in the unfolding direction until the first arc segment unlocking groove and the second outer locking segment coincide. The first spring pushes the first locking member to move towards the inner end of the rotating shaft, so that the first locking member simultaneously adapts to the first outer locking guide segment and the second outer locking guide segment. The armrest turntable is rotated so that the armrest turntable is in the unfolded state relative to the rotating base and locked.

[0026] Preferably, the side wall of the locking boss is provided with at least two positioning slots;

[0027] The backing plate is slidably fitted with a spring-loaded pin that abuts against the side wall of the locking protrusion. The front end of the spring-loaded pin extends to the positioning slot, and the spring-loaded pin is adapted to the positioning slot.

[0028] By using a spring-loaded latch and a positioning slot, the position of the backrest relative to the armrest can be easily locked to prevent it from rotating.

[0029] Preferably, the positioning slots include three distributed circumferentially. This allows for adjusting different tilt angles of the backrest.

[0030] Preferably, the end face of the locking boss is provided with an armrest inner cavity groove, the outer surface of the seat plate turntable is provided with a seat plate cavity groove, and the armrest inner cavity groove and the seat plate cavity groove are joined together to form an inner locking cavity;

[0031] The inner locking cavity is axially provided with a second guide and an inner locking groove from the inner cavity groove of the armrest to the inner cavity groove of the seat plate;

[0032] The second locking member can slide axially but cannot rotate circumferentially relative to the inner locking cavity via the second guide member. The second guide member includes a first inner locking guide section located in the inner cavity groove of the armrest and a second inner locking guide section located in the seat cavity groove. A second spring is provided between the second locking member and the seat cavity groove, and the second spring pushes the second locking member to slide towards the outer end of the inner locking cavity.

[0033] The inner locking groove includes a first inner locking section and a second inner locking section. The first inner locking section is located in the second boss section and connects the inside and outside of the second boss section. The second inner locking section is located in the seat cavity groove. A second arc-shaped unlocking groove is provided along the inner end of the backrest rotating circle. One end of the second arc-shaped unlocking groove is provided with an outlet slope corresponding to the rotation direction.

[0034] The second locking member has a second single-sloping surface driving tooth on its side wall. The second single-sloping surface driving tooth passes through the first inner locking section to the second arc-shaped unlocking groove. The slope of the second single-sloping surface driving tooth is corresponding to the slope of the groove.

[0035] When the second arc-shaped unlocking groove coincides with the first inner locking section, the second single-sloping drive tooth is located in the first inner locking section, and the second single-sloping drive tooth passes through the first inner locking section to the second arc-shaped unlocking groove. The second locking member is simultaneously adapted to the first inner locking guide section and the second inner locking guide section.

[0036] When the backrest rotates relative to the armrest turntable, the grooved inclined surface pushes the inclined surface of the second single inclined surface drive tooth, and the second arc segment unlocking groove is misaligned with the first inner locking segment, so that the second single inclined surface drive tooth moves to the second inner locking segment. At this time, the second locking member is only adapted to the second inner locking guide segment.

[0037] The relative positions of the armrest turntable and the seat turntable are locked by a second locking element. If the second locking element can only slide axially and not rotate circumferentially relative to both the armrest inner cavity groove and the seat cavity groove, then when the second locking element is only located in the seat cavity groove, the armrest turntable and the seat turntable can rotate relative to each other. However, if the second locking element is located in both the armrest inner cavity groove and the seat cavity groove, the relative angle between the armrest turntable and the seat turntable will be locked. The axial movement of the second locking element is achieved by the rotation of the backrest plate, specifically, the backrest plate rotates in the unfolding direction. When the second arc-shaped unlocking groove coincides with the first inner locking section, the second single-sloping surface drive tooth is located in the second arc-shaped unlocking groove, and the second locking element is simultaneously located in both the armrest inner cavity groove and the seat cavity groove. At this time, all three are in an unfolded state and locked. Rotate the armrest in the folding direction, and the inclined surface of the second arc-shaped unlocking groove will push the second single-inclined drive tooth to move into the seat cavity groove. The second arc-shaped unlocking groove is offset from the first inner locking section, and finally the second locking member is disengaged from the inner cavity groove of the armrest and is only located in the seat cavity groove. At this time, the armrest turntable and the seat turntable are unlocked and can rotate relative to each other.

[0038] Preferably, when the armrest turntable, backrest turntable and seat turntable are in the folded state, the second arc segment unlocking groove and the second inner locking segment are misaligned, so that the second single inclined surface drive tooth moves to the second inner locking segment, and the second locking member moves to the inner end of the rotating shaft. At this time, the second locking member is only adapted to the second inner locking guide segment.

[0039] The backrest rotates relative to the armrest turntable in the unfolding direction until the second arc segment unlocking groove and the second inner locking segment coincide. The second spring pushes the second locking member to move to the outer end of the rotating shaft, so that the second locking member simultaneously adapts to the first inner locking guide segment and the second inner locking guide segment. The armrest turntable is in the unfolded state and locked relative to the seat turntable.

[0040] The beneficial effects of this utility model are:

[0041] This solution enables the seat, backrest, and armrests to be quickly folded and unfolded relative to the base. Furthermore, it effectively locks the structure during the folding and unfolding process. The ingenious design allows for the determination of the relative angles of each component during the unfolding process, resulting in more stable angle locking. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only twelve of the drawings in this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of an embodiment of the present utility model;

[0044] Figure 2 This is an exploded view from the left side of an embodiment of the present invention;

[0045] Figure 3 This is an exploded view from the right side of an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the rotating base according to an embodiment of the present utility model;

[0047] Figure 5 This is a schematic diagram of the first locking member according to an embodiment of the present utility model;

[0048] Figure 6 This is a schematic diagram of the first driving component according to an embodiment of the present utility model;

[0049] Figure 7 This is a perspective view of the right side of the handle turntable according to an embodiment of the present utility model;

[0050] Figure 8 This is a perspective view of the left side of the handle turntable according to an embodiment of the present utility model;

[0051] Figure 9 This is a perspective view of the left side of the rotating backrest according to an embodiment of the present utility model;

[0052] Figure 10 This is a perspective view of the right side of the rotating backrest according to an embodiment of the present utility model;

[0053] Figure 11 This is a schematic diagram of the second locking member according to an embodiment of the present utility model;

[0054] Figure 12 This is a schematic diagram of the seat turntable according to an embodiment of the present utility model;

[0055] The components include: 1. Rotating base; 2. Base cavity; 3. First guide member; 4. Handrail turntable; 5. Handrail outer cavity groove; 6. Outer locking groove; 7. First outer locking section; 8. Second outer locking section; 9. Handrail inner cavity groove; 10. Guide post; 11. Protrusion; 12. Locking boss; 13. First boss section; 14. Second boss section; 15. Positioning slot; 16. First inner locking section; 17. Second inner locking section; 18. First spring. ; 19. First driving component; 20. First single-slope driving tooth; 21. First locking component; 22. First guide limiting tooth; 23. Spring latch; 24. Backrest rotating plate; 25. First arc-shaped unlocking groove; 26. Second arc-shaped unlocking groove; 27. Outlet slope; 28. Seat plate turntable; 29. ​​Seat plate cavity groove; 30. Second guide component; 31. Second locking component; 32. Second spring; 33. Second single-slope driving tooth. Detailed Implementation

[0056] To enhance understanding of this utility model, it will be described in further detail below with reference to the accompanying drawings and embodiments. These embodiments are only used to explain this utility model and do not limit the scope of protection of this utility model.

[0057] Example

[0058] like Figure 1 As shown, the joint structure for a folding vehicle includes a rotating base 1, an armrest turntable 4, a backrest turntable 24, and a seat turntable 28 arranged sequentially from the outer end to the inner end of the rotating shaft; the rotating base 1, armrest turntable 4, backrest turntable 24, and seat turntable 28 are respectively rotatably engaged.

[0059] A rotating base 1 is located on both sides of the main body, armrest turntables 4 are located at both ends of the armrests, backrest turntables 24 are located on both sides of the backrest, and seat turntables 28 are located on both sides of the seat.

[0060] The inner surface of the rotating base 1 is provided with a base cavity groove 2;

[0061] The outer surface of the handrail turntable 4 is provided with a handrail outer cavity groove 5;

[0062] The base cavity 2 and the armrest outer cavity 5 are joined together to form an outer locking cavity;

[0063] The outer locking cavity is provided with a first locking element 21 and a first driving element 19 distributed from the outside to the inside;

[0064] The first driving member 19 is located in the outer cavity groove 5 of the armrest, and the first driving member 19 can slide axially relative to the outer cavity groove 5 but cannot rotate circumferentially;

[0065] The sidewall of the outer locking cavity is axially provided with a first guide member 3 from the base cavity groove 2 to the handrail outer cavity groove 5. The first locking member 21 can slide axially relative to the outer locking cavity through the first guide member 3 but cannot rotate circumferentially. The first guide member 3 includes a first outer locking guide section located in the base cavity groove and a second outer locking guide section located in the handrail outer cavity groove 5.

[0066] A first spring 18 is provided between the first locking member 21 and the base cavity 2. The first spring 18 pushes the first locking member 21 and the first driving member 19 to slide towards the inner end of the outer locking cavity.

[0067] During the rotation of the backplate 24, the first driving member 19 is pushed to slide towards the outer end of the rotating shaft, so that the first locking member 21 is adapted to the first outer lock guide section or simultaneously adapted to the first outer lock guide section and the second outer lock guide section.

[0068] The rotating base 1, armrest turntable 4, backrest turntable 24, and seat turntable 28 are rotatably coordinated, allowing for adjustment of their relative angles and facilitating folding and storage. The outer locking cavity is equipped with a first guide 3, enabling the first locking member 21 to slide axially through the guide 3. If the first locking member 21 is located solely in the base cavity 2, relative rotation between the armrest turntable 4 and the rotating base 1 is possible. However, if the first locking member 21 is located in both the armrest outer cavity 5 and the base cavity 2, due to the presence of the first guide 3, the first locking member 21 can only slide axially within both the armrest outer cavity 5 and the base cavity 2, preventing circumferential rotation. Therefore, relative rotation between the armrest turntable 4 and the rotating base 1 is impossible in this case.

[0069] The specific state of the first locking member 21 is determined by the first driving member 19 and the first spring 18. When the first driving member 19 provides a thrust to push the first locking member 21, the first locking member 21 is located alone in the base cavity 2. When the first driving member 19 does not provide a thrust, the first locking member 21 is simultaneously located in the outer cavity 5 of the armrest and the base cavity 2 under the push of the first spring 18.

[0070] The first guide member 3 is a first guide limiting groove disposed on the side wall of the outer locking cavity, and the first locking member 21 is provided with a first guide limiting tooth 22 that slides and adapts to the first guide limiting groove. This ensures that the first locking member 21 can only slide axially and cannot rotate circumferentially within the outer cavity groove 5 of the handrail and the cavity groove 2 of the base.

[0071] A guide post 10 is axially arranged on the outer locking cavity. The guide post 10 can further improve the stability of the first driving member 19 and the first locking member 21 during the sliding process in the outer locking cavity.

[0072] The side wall of the outer cavity groove 5 of the handrail is provided with an outer locking groove 6. The outer locking groove 6 includes a first outer locking section 7 and a second outer locking section 8. The first outer locking section 7 is located on the outer end side of the rotating shaft relative to the second outer locking section 8.

[0073] The inner end face of the first driving member 19 is provided with a first single inclined surface driving tooth 20 corresponding to the outer locking groove 6, and the first single inclined surface driving tooth 20 slides axially with the outer locking groove 6.

[0074] The inner surface of the handrail turntable 4 is provided with a locking protrusion 12. The outer wall of the locking protrusion 12 includes a first protrusion section 13 and a second protrusion section 14 from the outer end to the inner end. The first protrusion section 13 is located outside the second outer locking section 8, and the bottom of the groove of the second outer locking section 8 passes through the outer wall of the first protrusion section 13.

[0075] The outer wall of the locking boss 12 is rotatably fitted with the back plate rotating ring 24, and the inner edge of the outer end of the back plate rotating ring 24 is provided with a first arc-shaped unlocking groove 25 corresponding to the first outer locking segment 7.

[0076] When the first arc-shaped unlocking groove 25 coincides with the second outer locking section 8, the first single-sloping drive tooth 20 is located in the second outer locking section 8, and the first single-sloping drive tooth 20 extends through the second outer locking section 8 to the first arc-shaped unlocking groove 25. At this time, the first locking member 21 is simultaneously located in the armrest outer cavity groove 5 and the base cavity groove 2.

[0077] When the backrest 24 rotates relative to the armrest turntable 4, and the first guide 3 of the armrest outer cavity groove 5 and the base cavity groove 2 are aligned, the end slope of the first arc-shaped unlocking groove 25 will push the first single-slope driving tooth 20 to move to the first outer locking section 7, and the first driving member 19 will push the first locking member 21 to adapt to the first outer locking guide section.

[0078] By rotating the backrest plate 24, the first arc-shaped unlocking groove 25 and the first single-sloping drive tooth 20 are either aligned or misaligned. Under the push of the end slope of the first arc-shaped unlocking groove 25 and the first spring 18, the first locking member 21 is controlled to be located only in the base cavity groove 2 or simultaneously in the armrest outer cavity groove 5 and the base cavity groove 2.

[0079] When the rotating base 1, armrest turntable 4 and backrest turntable 24 are in the folded state, the first arc segment unlocking groove 25 and the second outer locking segment 8 are misaligned. The end slope of the first arc segment unlocking groove 25 pushes the first single slope driving tooth 20 to move to the first outer locking segment 7. The first driving member 19 pushes the first locking member 21 to move to the outer end of the rotating shaft, so that the first locking member 21 is only adapted to the first outer locking guide segment.

[0080] The backrest rotating ring 24 rotates relative to the armrest turntable 4 in the unfolding direction until the first arc segment unlocking groove 25 and the second outer locking segment 8 coincide. The first spring 18 pushes the first locking member 21 to move towards the inner end of the rotating shaft, so that the first locking member 21 is simultaneously adapted to the first outer locking guide segment and the second outer locking guide segment. The armrest turntable 4 is rotated so that the armrest turntable 4 is in the unfolded state relative to the rotating base 1 and locked.

[0081] In this embodiment, the first single inclined surface is designed to be located at the position where the end inclined surface of the first arc segment unlocking groove 25 first contacts the first single inclined surface drive tooth 20 during the process of the backrest rotating 24 folding relative to the armrest.

[0082] The outer end face of the first locking member 21 is provided with a hole or groove that is adapted to the first spring 18 so that the first spring 18 has room to extend and retract.

[0083] The side wall of the locking protrusion 12 is provided with at least two positioning slots 15;

[0084] The back plate rotating ring 24 is slidably engaged with a spring latch 23 that abuts against the side wall of the locking protrusion 12. The front end of the spring latch 23 extends to the positioning slot 15, and the spring latch 23 is adapted to the positioning slot 15.

[0085] By engaging the spring latch 23 with the positioning slot 15, the position of the backrest rotating plate 24 relative to the armrest can be easily locked under the pushing force of the spring latch 23, preventing it from rotating.

[0086] The positioning slot 15 has three slots distributed circumferentially. These slots can be used to adjust different tilt angles of the backrest.

[0087] In this embodiment, the backrest rotating ring 24 is provided with a positioning groove 15 that matches the spring latch 23 so that the spring latch 23 can slide. The tail of the spring latch 23 is provided with a spring. The extension and retraction of the spring latch 23 can be achieved by the spring pushing and the steel cable pulling, which can easily lock and unlock the position of the backrest rotating ring 24 relative to the armrest.

[0088] The end face of the locking boss 12 is provided with an armrest inner cavity groove 9, and the outer surface of the seat plate turntable 28 is provided with a seat plate cavity groove 29. The armrest inner cavity groove 9 and the seat plate cavity groove 29 are closed to form an inner locking cavity.

[0089] The inner locking cavity is axially provided with a second guide 30 and an inner locking groove from the inner cavity groove 9 of the armrest to the cavity groove 29 of the seat plate;

[0090] The second locking member 31 can slide axially but cannot rotate circumferentially relative to the inner locking cavity via the second guide member 30. The second guide member 30 includes a first inner locking guide section located in the inner cavity groove of the armrest and a second inner locking guide section located in the seat cavity groove. A second spring 32 is provided between the second locking member 31 and the seat cavity groove 29. The second spring 32 pushes the second locking member 31 to slide towards the outer end of the inner locking cavity. The outer end face of the second locking member 31 is provided with a hole or groove for the second spring 32 to fit.

[0091] The inner locking groove includes a first inner locking section 16 and a second inner locking section 17. The first inner locking section 16 is located in the second boss section 14 and connects the inside and outside of the second boss section 14. The second inner locking section 17 is located in the seat cavity groove 29. The inner end of the backrest rotating ring 24 is provided with a second arc-shaped unlocking groove 26. One end of the second arc-shaped unlocking groove 26 is provided with a groove exit slope 27 corresponding to the rotation direction.

[0092] The second locking member 31 has a second single-sloping surface driving tooth 33 on its side wall. The second single-sloping surface driving tooth 33 passes through the first inner locking section 16 to the second arc-shaped unlocking groove 26. The slope of the second single-sloping surface driving tooth 33 is correspondingly set with the groove exit slope 27.

[0093] When the second arc-shaped unlocking groove 26 coincides with the first inner locking section 16, the second single-sloping drive tooth 33 is located in the first inner locking section 16, and the second single-sloping drive tooth 33 passes through the first inner locking section 16 to the second arc-shaped unlocking groove 26. The second locking member 31 is simultaneously adapted to the first inner locking guide section and the second inner locking guide section.

[0094] When the backrest rotating ring 24 rotates relative to the armrest turntable 4, the grooved inclined surface 27 pushes the inclined surface of the second single inclined surface drive tooth 33, and the second arc segment unlocking groove 26 is misaligned with the first inner locking segment 16, so that the second single inclined surface drive tooth 33 moves to the second inner locking segment 17. At this time, the second locking member 31 is only adapted to the second inner locking guide segment.

[0095] The relative positions of the armrest turntable 4 and the seat turntable 28 are locked by the second locking member 31. If the second locking member 31 can only slide axially and not rotate circumferentially relative to both the armrest inner cavity groove 9 and the seat cavity groove 29, then when the second locking member 31 is only located in the seat cavity groove 29, the armrest turntable 4 and the seat turntable 28 can rotate relative to each other. However, if the second locking member 31 is located in both the armrest inner cavity groove 9 and the seat cavity groove 29, the relative angle between the armrest turntable 4 and the seat turntable 28 will be locked. The axial movement of the second locking member 31 is achieved by the movement of the backrest rotating ring 24. Specifically, the backrest rotating ring 24 rotates in the unfolding direction. When the second arc segment unlocking groove 26 coincides with the first inner locking segment 16, the second single inclined surface drive tooth 33 is located in the second arc segment unlocking groove 26, and the second locking member 31 is located in both the armrest inner cavity groove 9 and the seat cavity groove 29. At this time, all three are in an unfolded state and locked. Rotate the armrest 24 in the folding direction. The grooved slope 27 of the second arc-shaped unlocking groove 26 will push the second single-slope drive tooth 33 to move towards the seat cavity groove 29. The second arc-shaped unlocking groove 26 is offset from the first inner locking section 16, and finally the second locking member 31 is disengaged from the inner cavity groove 9 of the armrest and is only located in the seat cavity groove 29. At this time, the armrest turntable 4 and the seat turntable 28 are unlocked and can rotate relative to each other.

[0096] In this embodiment, when the second single-slope driving tooth 33 is located in the second arc-segment unlocking groove 26, the backrest rotating 24 performs a folding motion relative to the armrest turntable 4. The end of the second single-slope driving tooth 33 that contacts the second arc-segment unlocking groove 26 is provided with an exiting groove slope 27. The slope of the second single-slope driving tooth 33 is adapted to the exiting groove slope 27.

[0097] When the armrest turntable 4, backrest turntable 24 and seat turntable 28 are in the folded state, the second arc segment unlocking groove 26 and the second inner locking segment 17 are misaligned, so that the second single inclined surface drive tooth 33 moves to the second inner locking segment 17, and the second locking member 31 moves to the inner end of the rotating shaft. At this time, the second locking member 31 is only adapted to the second inner locking guide segment.

[0098] The backrest rotating plate 24 rotates relative to the armrest turntable 4 in the unfolding direction until the second arc segment unlocking groove 26 and the second inner locking segment 17 overlap. The second spring 32 pushes the second locking member 31 to move to the outer end of the rotating shaft, so that the second locking member 31 is simultaneously adapted to the first inner locking guide segment and the second inner locking guide segment. The armrest turntable 4 is in the unfolded state and locked relative to the seat turntable 28.

[0099] The beneficial effects of this utility model are:

[0100] This solution enables the seat, backrest, and armrests to be quickly folded and unfolded relative to the base, and it can effectively lock the structure during the folding and unfolding process. The structure is ingeniously designed, and the relative angles of each structure are determined simultaneously during the opening process.

[0101] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A joint structure for folding vehicles, characterized in that, It includes a rotating base (1), an armrest turntable (4), a backrest turntable (24), and a seat turntable (28) arranged sequentially from the outer end to the inner end of the rotating shaft; the rotating base (1), armrest turntable (4), backrest turntable (24), and seat turntable (28) are rotatably connected; The inner surface of the rotating base (1) is provided with a base cavity groove (2); The outer surface of the handrail turntable (4) is provided with a handrail outer cavity groove (5); The base cavity (2) and the armrest outer cavity (5) are joined together to form an outer locking cavity; The outer locking cavity is provided with a first locking element (21) and a first driving element (19) distributed from the outside to the inside; The first driving member (19) is located in the outer cavity groove (5) of the armrest. The first driving member (19) can slide axially relative to the outer cavity groove (5) but cannot rotate circumferentially. The sidewall of the outer locking cavity is axially provided with a first guide member (3) from the base cavity groove (2) to the handrail outer cavity groove (5). The first locking member (21) can slide axially relative to the outer locking cavity through the first guide member (3) but cannot rotate circumferentially. The first guide member (3) includes a first outer locking guide section located in the base cavity groove and a second outer locking guide section located in the handrail outer cavity groove (5). A first spring (18) is provided between the first locking member (21) and the base cavity (2), and the first spring (18) pushes the first locking member (21) and the first driving member (19) to slide towards the inner end of the outer locking cavity; During the rotation of the backplate (24), the first driving member (19) is pushed to slide to the outer end of the rotating shaft, so that the first locking member (21) is only adapted to the first outer locking guide section or is adapted to both the first outer locking guide section and the second outer locking guide section at the same time.

2. The folding vehicle joint structure according to claim 1, characterized in that: The first guide member (3) is a first guide limiting groove provided on the side wall of the outer locking cavity, and the first locking member (21) is provided with a first guide limiting tooth (22) that is slidably adapted to the first guide limiting groove.

3. The folding vehicle joint structure according to claim 1, characterized in that: The outer locking cavity is axially provided with a guide post (10).

4. The folding vehicle joint structure according to claim 1, characterized in that: The side wall of the outer cavity groove (5) of the handrail is provided with an outer locking groove (6), the outer locking groove (6) includes a first outer locking section (7) and a second outer locking section (8), the first outer locking section (7) is located on the outer end side of the rotating shaft relative to the second outer locking section (8); The inner end face of the first driving member (19) is provided with a first single inclined surface driving tooth (20) corresponding to the outer locking groove (6), and the first single inclined surface driving tooth (20) slides axially with the outer locking groove (6); The inner surface of the handrail turntable (4) is provided with a locking protrusion (12). The outer wall of the locking protrusion (12) includes a first protrusion section (13) and a second protrusion section (14) from the outer end to the inner end. The first protrusion section (13) is located outside the second outer locking section (8). The bottom of the groove of the second outer locking section (8) passes through the outer wall of the first protrusion section (13). The outer wall of the locking boss (12) is rotatably fitted with the back plate rotating ring (24), and the inner edge of the outer end of the back plate rotating ring (24) is provided with a first arc-shaped unlocking groove (25) corresponding to the first outer locking segment (7); When the first arc-shaped unlocking groove (25) coincides with the second outer locking section (8), the first single-sloping surface driving tooth (20) is located in the second outer locking section (8), and the first single-sloping surface driving tooth (20) extends to the first arc-shaped unlocking groove (25) through the second outer locking section (8). At this time, the first locking member (21) is simultaneously adapted to the first outer locking guide section and the second outer locking guide section. When the backrest rotates (24) relative to the armrest turntable (4), and the first guide (3) of the armrest outer cavity groove (5) and the base cavity groove (2) are aligned, the end slope of the first arc-shaped unlocking groove (25) will push the first single-slope drive tooth (20) to move to the first outer locking section (7), and the first drive (19) will push the first locking member (21) to adapt to the first outer locking guide section.

5. The folding vehicle joint structure according to claim 4, characterized in that: When the rotating base (1), armrest turntable (4) and backrest turntable (24) are in the folded state, the first arc segment unlocking groove (25) and the second outer locking segment (8) are misaligned. The end of the first arc segment unlocking groove (25) pushes the first single inclined surface drive tooth (20) to move to the first outer locking segment (7). The first drive member (19) pushes the first locking member (21) to move to the outer end of the rotating shaft, so that the first locking member (21) is only adapted to the first outer locking guide segment. The backrest rotating plate (24) rotates relative to the armrest turntable (4) in the unfolding direction until the first arc segment unlocking groove (25) and the second outer locking segment (8) overlap. The first spring (18) pushes the first locking member (21) to move towards the inner end of the rotating shaft, so that the first locking member (21) is simultaneously adapted to the first outer locking guide segment and the second outer locking guide segment, so that the armrest turntable (4) is in the unfolded state and locked relative to the rotating base (1).

6. The folding vehicle joint structure according to claim 4, characterized in that: The side wall of the locking boss (12) is provided with at least two positioning slots (15); The back plate rotating ring (24) is slidably engaged with a spring latch (23) that abuts against the side wall of the locking protrusion (12). The front end of the spring latch (23) extends to the positioning slot (15), and the spring latch (23) is adapted to the positioning slot (15).

7. The folding vehicle joint structure according to claim 6, characterized in that: The positioning slot (15) includes three slots distributed in the circumferential direction.

8. The folding vehicle joint structure according to claim 6, characterized in that: The end face of the locking boss (12) is provided with an armrest inner cavity groove (9), and the outer surface of the seat plate turntable (28) is provided with a seat plate cavity groove (29). The armrest inner cavity groove (9) and the seat plate cavity groove (29) are closed to form an inner locking cavity. The inner locking cavity is axially provided with a second guide (30) and an inner locking groove from the inner cavity groove (9) of the armrest to the cavity groove (29) of the seat plate; The second locking member (31) can slide axially but cannot rotate circumferentially relative to the inner locking cavity via the second guide member (30). The second guide member (30) includes a first inner locking guide section located in the inner cavity groove of the armrest and a second inner locking guide section located in the seat cavity groove. A second spring (32) is provided between the second locking member (31) and the seat cavity groove (29). The second spring (32) pushes the second locking member (31) to slide towards the outer end of the inner locking cavity. The inner locking groove includes a first inner locking section (16) and a second inner locking section (17) from the outside to the inside. The first inner locking section (16) is located in the second boss section (14) and connects the inside and outside of the second boss section (14). The second inner locking section (17) is located in the seat cavity groove (29). The inner end of the backrest rotating ring (24) is provided with a second arc-shaped unlocking groove (26). One end of the second arc-shaped unlocking groove (26) is provided with a groove exit slope (27) corresponding to the rotation direction. The second locking member (31) has a second single-sloping surface driving tooth (33) on its side wall. The second single-sloping surface driving tooth (33) passes through the first inner locking section (16) to the second arc-shaped unlocking groove (26). The slope of the second single-sloping surface driving tooth (33) is correspondingly set with the groove slope (27). When the second arc-shaped unlocking groove (26) coincides with the first inner locking section (16), the second single-sloping surface driving tooth (33) is located in the first inner locking section (16), and the second single-sloping surface driving tooth (33) passes through the first inner locking section (16) to the second arc-shaped unlocking groove (26). The second locking member (31) is simultaneously adapted to the first inner locking guide section and the second inner locking guide section. When the backrest rotating plate (24) rotates relative to the armrest turntable (4), the grooved inclined surface (27) pushes the inclined surface of the second single inclined surface drive tooth (33), and the second arc segment unlocking groove (26) is misaligned with the first inner locking section (16), so that the second single inclined surface drive tooth (33) moves to the second inner locking section (17). At this time, the second locking member (31) is only adapted to the second inner locking guide section.

9. The folding vehicle joint structure according to claim 8, characterized in that: When the armrest turntable (4), backrest turntable (24) and seat turntable (28) are in the folded state, the second arc segment unlocking groove (26) and the second inner locking segment (17) are misaligned, so that the second single inclined surface drive tooth (33) moves to the second inner locking segment (17), and the second locking member (31) moves to the inner end of the rotating shaft. At this time, the second locking member (31) is only adapted to the second inner locking guide segment. The backrest rotating plate (24) rotates relative to the armrest turntable (4) in the unfolding direction until the second arc segment unlocking groove (26) and the second inner locking segment (17) coincide. The second spring (32) pushes the second locking member (31) to move to the outer end of the rotating shaft, so that the second locking member (31) is adapted to the first inner locking guide segment and the second inner locking guide segment. The armrest turntable (4) is in the unfolded state and locked relative to the rotating base (1).

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