Quick foldable stroller

Abstract

The application discloses a fast foldable baby carriage, which is characterized in that: the front leg joint of the upper end of the front leg part of the foldable carriage frame, the rear leg joint of the upper end of the rear leg part and the push rod joint of the lower end of the push rod part are sequentially hinged and connected; the push rod locking member installed on the push rod joint can lock or unlock at least one of the push rod joint, the rear leg joint and the front leg joint in the circumferential direction; the front leg locking member installed on the front leg joint can lock or unlock the front leg joint and the rear leg joint in the circumferential direction; the push rod locking elastic member and the front leg locking elastic member respectively provide the push rod locking member and the front leg locking member with elastic holding force in the locking position; and the carriage joint unlocking mechanism can drive the push rod locking member and the front leg locking member to move reversely and be unlocked by overcoming the elastic holding force of the push rod locking elastic member and the front leg locking elastic member. The application has the advantages of convenient operation, high part strength, easy production and firm overall carriage frame.

Description

Technical Field

[0001] This invention relates to a stroller, and more particularly to a stroller that can be quickly folded. Background Technology

[0002] Strollers are primarily used for infants and toddlers, and most strollers currently employ folding mechanisms for portability. Existing strollers use separate folding control mechanisms for the frame and seat. Folding the stroller requires folding the seat first, then the frame; unfolding requires unfolding the frame first, then the seat. This makes folding and unfolding the stroller cumbersome and inconvenient. Furthermore, the seat of most strollers cannot be detached from the frame, making it inconvenient for users in places where pushing the stroller is difficult. Additionally, the central joint of the frame and seat in existing strollers has a complex structure for stability, with many metal parts, resulting in high cost, difficult production, and cumbersome folding and unfolding operations. Moreover, most current folding strollers are unidirectional, making bidirectional pushing difficult. Summary of the Invention

[0003] To overcome the above-mentioned defects, the present invention provides a quick-folding stroller. The quick-folding stroller has a simple structure, is easy to fold, has high component strength, is easy to manufacture, has a sturdy overall frame, and does not wobble when the push rod changes direction.

[0004] The technical solution adopted by this invention to solve its technical problem is: a quick-folding stroller, including a foldable frame, the foldable frame including a front leg portion, a rear leg portion, a push rod portion, a push rod locking member, a front leg locking member, a push rod locking elastic member, a front leg locking elastic member, and a frame joint unlocking mechanism. Based on the usage state, the upper end of the front leg portion, the upper end of the rear leg portion, and the lower end of the push rod portion are respectively provided with a front leg joint, a rear leg joint, and a push rod joint. The push rod joint, the front leg joint, and the rear leg joint are sequentially hinged together around a horizontally extending pivot. The push rod locking member and the front leg locking member are respectively capable of... The push rod locking mechanism is mounted on the push rod joint and the front foot joint, and the forward and reverse movement of the push rod locking mechanism can lock or unlock the push rod joint and at least one of the rear foot joint and the front foot joint in the circumferential direction. The forward and reverse movement of the front foot locking mechanism can lock or unlock the front foot joint and the rear foot joint in the circumferential direction. The push rod locking elastic element and the front foot locking elastic element provide elastic holding force to the push rod locking mechanism and the front foot locking mechanism respectively to keep them in the locked position. The frame joint unlocking mechanism can drive the push rod locking mechanism and the front foot locking mechanism to move in the opposite direction to unlock over the elastic holding force of the push rod locking elastic element and the front foot locking elastic element.

[0005] As a further improvement of the present invention, the push rod joint has a first push rod joint locking groove on the side wall facing the front foot joint, the rear foot joint has a first front foot locking groove on the side wall facing the front foot joint, the front foot joint has a second front foot locking groove on the side wall facing the rear foot joint, and the front foot joint has a second push rod joint locking groove on the side wall facing the push rod joint. One end of the push rod locking member is circumferentially stopped and axially slidable by a set distance, inserted into the first push rod joint locking groove; the other end of the push rod locking member is circumferentially stopped and axially slidable, inserted into the second push rod joint locking groove; one end of the front foot locking member is circumferentially stopped and axially slidable by a set distance, inserted into the first front foot locking groove; and the front foot locking member is circumferentially stopped and axially slidable, inserted into the second front foot locking groove. The locking elastic element provides an elastic retaining force to the push rod locking element in the direction of the front foot joint, and the front foot locking elastic element provides an elastic retaining force to the front foot locking element in the direction of the front foot joint. The frame joint unlocking mechanism can drive the push rod locking element to move in the unlocking direction. The front foot joint is also provided with at least one axially extending through hole. A frame joint unlocking push pin is axially slidably inserted in the through hole. The push rod joint has at least one frame joint unlocking ramp on the side wall facing the front foot joint. One end of the frame joint unlocking push pin is correspondingly pressed against the frame joint unlocking ramp, and the other end of the frame joint unlocking push pin is pressed against the front foot locking element. The rotation of the push rod joint relative to the front foot joint in the folding direction can force the frame joint unlocking push pin to slide in the direction of the rear foot joint and finally push the front foot locking element out of the second front foot locking tooth groove.

[0006] As a further improvement of the present invention, a push pin guide groove is provided on the side wall of the push rod joint facing the front foot joint. When the push rod joint rotates relative to the front foot joint, the frame joint unlocking push pin can slide along the push pin guide groove. A frame joint unlocking inclined surface is provided at each end of the push rod guide groove along the direction of push rod rotation. After the push rod joint rotates relative to the front foot joint within a set angle range, the frame joint unlocking push pin begins to contact the frame joint unlocking inclined surface.

[0007] As a further improvement of the present invention, the frame joint unlocking operation component includes a traction cable mechanism. The traction cable mechanism includes a frame joint unlocking wrench that is rotatable or slidable and mounted on the push rod portion, and a traction cable extending along the push rod portion. The two ends of the traction cable are respectively connected to the frame joint unlocking wrench and the push rod locking member. Rotating or sliding the frame joint unlocking wrench can pull the push rod locking member to move in the opposite direction through the traction cable.

[0008] As a further improvement of the present invention, one end of the push rod locking member is provided with a push rod locking gear, and the other end of the push rod locking member is provided with a push rod locking pin. One end of the push rod locking gear is inserted into the first push rod joint locking tooth groove, which is circumferentially stopped and axially slidable by a set distance. The push rod locking gear is inserted into the second push rod joint locking tooth groove, which is circumferentially stopped and axially slidable. A push rod locking slot is also provided on the side wall of the rear foot joint facing the front foot joint. A first clearance hole is also provided on the front foot joint. The push rod locking pin at the other end of the push rod locking member can rotate through the first clearance hole and is inserted into the push rod locking slot, which is circumferentially stopped and axially slidable. The elastic retaining force of the push rod locking elastic member can make the push rod locking gear and the second push rod joint locking tooth groove engage and lock. Simultaneously, the push rod locking pin engages and locks with the push rod locking slot. The frame joint unlocking mechanism drives the push rod locking component to move in the opposite direction, causing the push rod locking gear and the push rod locking pin to simultaneously disengage from the second push rod joint locking tooth groove and the push rod locking slot. The frame joint unlocking mechanism also includes a frame joint unlocking button. The frame joint unlocking button is slidably installed on the side wall of the rear foot joint, opposite to the front foot joint, and is axially perforated on the rear foot joint. The frame joint unlocking button is equipped with an unlocking push rod, which is slidably inserted into the axial perforation of the rear foot joint, with the end of the unlocking push rod tightly abutting the other end surface of the push rod locking component. Pressing the frame joint unlocking button causes the unlocking push rod to slide axially and push the push rod locking component to move in the opposite direction to unlock.

[0009] As a further improvement of the present invention, a foldable seat is also provided. The foldable seat includes a seat portion, a backrest portion, a front armrest portion, a seat socket, a backrest adjustment latch, a seat locking element, an armrest locking block, a seat joint unlocking mechanism, a latch reset elastic element, a locking element elastic element, and a locking block elastic element. The rear end of the seat portion is provided with a seat joint, and the lower ends of the backrest portion and the front armrest portion are respectively provided with a backrest joint and a front armrest joint. The seat socket, armrest joint, seat joint, and backrest joint are sequentially hinged together around a horizontally extending pivot. The backrest adjustment latch, seat locking element, and armrest locking block are respectively mounted on the backrest joint, seat socket, and seat joint, which can move within a certain range. The forward and reverse movement of the backrest adjustment latch can lock or unlock the backrest joint and seat joint in the circumferential direction. The reverse movement can lock or unlock the seat socket and seat joint in the circumferential direction. The forward and reverse movement of the armrest locking block can lock or unlock the armrest joint and seat joint in the circumferential direction. The lock tongue reset elastic element, the locking element elastic element, and the locking block elastic element provide elastic holding forces to the backrest adjustment lock tongue, seat locking element, and armrest locking block to keep them in the locked position. The seat joint unlocking mechanism can drive the backrest adjustment lock tongue, seat locking element, and armrest locking block to move in the opposite direction to unlock, overcoming the elastic holding forces of the lock tongue reset elastic element, locking element elastic element, and locking block elastic element. The seat socket has a seat mounting slot with an opening facing downward on the side opposite to the armrest joint. The rear leg joint has a seat mounting protrusion on the side wall opposite to the front leg joint. The seat mounting slot can be sleeved on the outside of the seat mounting protrusion and fastened and fixed thereto.

[0010] As a further improvement of the present invention, the seat joint is provided with at least one backrest joint adjustment groove on the end facing the backrest joint, and two or more backrest joint adjustment grooves are arranged at intervals along the rotation direction of the backrest joint. The forward and reverse movement of the backrest adjustment latch can insert into and retract any one of the backrest joint grooves to lock or unlock the backrest joint and the seat joint in the circumferential direction. The latch reset elastic element provides an elastic holding force to the backrest adjustment latch in the direction of the backrest joint adjustment groove. The seat joint unlocking mechanism can drive the backrest adjustment latch to move forward and reverse. A first seat joint locking groove and a first armrest joint locking slot are provided on the side facing the backrest joint. A second seat joint locking groove and a first linkage inclined surface are provided on the side facing the seat joint. A second clearance hole and a second armrest joint locking slot are provided on the armrest joint. One end of the seat locking member is circumferentially stopped and axially slidable by a set distance, inserted into the second seat joint locking groove. The other end of the seat locking member passes through the first clearance hole and is circumferentially stopped and axially slidable, inserted into the first seat joint locking groove. The elastic element provides the seat locking element with an elastic retaining force that moves towards the first seat joint locking groove. The armrest locking block is inserted into the first armrest joint locking slot, with one end circumferentially stopped and axially sliding a set distance. The armrest locking block has a U-shaped joint structure, with its other end forming two bifurcated side walls. One side wall of the U-shaped armrest locking block is inserted into the second armrest joint locking slot, and the other side wall passes through the second clearance hole and contacts the first linkage inclined surface. The locking block elastic element provides the armrest locking block with an elastic retaining force that moves towards the second armrest joint locking slot. The elastic holding force of the movement, the seat socket can be rotated relative to the seat joint in the folding direction to force the armrest locking block to disengage from the first armrest joint locking slot through the first linkage inclined surface, the seat joint is also provided with a third clearance hole, the backrest joint is provided with a linkage protrusion on the side facing the seat joint, the linkage protrusion is formed with a second linkage inclined surface, the seat locking member is provided with a third linkage inclined surface on the end face facing the seat joint, the second linkage inclined surface and the third linkage inclined surface are in close contact, the backrest joint can be rotated in the folding direction to force the seat locking member to disengage from the first seat joint locking tooth groove.

[0011] As a further improvement of the present invention, the backrest joint is provided with a fourth linkage inclined surface at an angle to its axial direction on the side wall facing the seat socket. The seat socket is also provided with a guide hole facing the unlock button of the frame joint. An unlocking push block is inserted into the guide hole and can slide axially. One end of the unlocking push block passes through the second clearance hole on the armrest joint and the third clearance hole on the seat joint and contacts the fifth linkage inclined surface. A push block reset elastic element is also provided. The push block reset elastic element provides the unlocking push block with an elastic holding force in the direction of the backrest joint. When the foldable seat is folded, the rotation of the backrest joint relative to the seat socket can force the unlocking push block to slide in the direction of the seat socket through the fifth linkage inclined surface, thereby causing the other end of the unlocking push block to slide along the guide hole and extend out of the seat socket by a set length. The other end of the unlocking push block extending out of the seat socket can press the unlock button of the frame joint to unlock the frame.

[0012] As a further improvement of the present invention, an arc-shaped protrusion is provided on the side wall of the backrest joint facing the seat socket, and a fourth linkage inclined surface is provided on the side wall of the arc-shaped protrusion. An arc-shaped protrusion is provided on one side wall of the unlocking push block, and a fifth linkage inclined surface (921) matching the fourth linkage inclined surface is provided on the side wall of the arc-shaped protrusion. When the arc-shaped protrusion and the arc-shaped protrusion rotate relative to each other, the fifth linkage inclined surface on the arc-shaped protrusion can slide along the fourth linkage inclined surface on the side wall of the arc-shaped protrusion, thereby allowing the arc-shaped protrusion to finally slide from the bottom of the arc-shaped protrusion to the top of the arc-shaped protrusion.

[0013] As a further improvement of the present invention, a convex ring concentric with its pivot is provided on the side wall of the backrest joint facing the seat socket. The linkage protrusion is provided on the end face of the convex ring, and the arc-shaped protrusion is provided on the outer side face of the end of the convex ring. There is a gap between the arc-shaped protrusion and the side wall of the backrest joint facing the seat socket that can accommodate the arc-shaped protrusion. A push-damping mechanism is also provided. The push-damping mechanism includes a push-damping damper, a push-damping elastic element, and a push-damping cover. A T-shaped perforation is provided on the backrest joint. The push-damping damper is a T-shaped block structure. The end of the push-damping damper with a smaller diameter forms a cone or ball head structure with a gradually decreasing radial dimension. The end of the push-damping damper with a smaller diameter can extend into the backrest joint. A distance is set on the surface facing the seat socket. The stepped surface between the two ends of the push damper stops on the stepped surface between the two ends of the T-shaped perforation. The push damper cover is fixedly installed on the side of the backrest joint facing away from the seat socket. The push damper elastic element is tightly clamped between the push damper cover and the push damper to provide elastic holding force for the push damper in the direction of the seat socket. A pre-push guide slope is provided on one end of the unlock push block. When the backrest joint rotates relative to the seat socket in the folding direction, the pre-push guide slope on one end of the unlock push block first contacts the side wall of the push damper with the smaller diameter, so that the arc-shaped protrusion moves in advance along the axial direction of the backrest joint to the position directly opposite the arc-shaped protrusion.

[0014] The beneficial effects of this invention are as follows: This invention unlocks the push rod joint and the front leg joint by driving the push rod locking member and the front leg locking member to move towards the unlocking scheme, respectively, through the frame joint unlocking mechanism. The frame joint unlocking mechanism of this invention can unlock the push rod joint by pulling the gear-structured push rod locking member back into the push rod joint through a traction cable, or by pressing the joint unlocking button to push the gear-structured push rod locking member into the push rod joint. After the push rod joint is unlocked, pressing down on the push rod joint section retracts the push rod section. Simultaneously, the inclined surface on the push rod joint pushes the frame joint unlocking push pin, which in turn pushes the gear-structured front leg locking member to unlock the front leg joint, thus unlocking the front leg joint and enabling manual frame retraction. During the unlocking process of the frame center joint, only the push rod joint needs to be unlocked; the front leg joint is unlocked during the movement of the push rod joint, thereby achieving the above-mentioned retraction action. Furthermore, since the front leg joint and rear leg joint do not immediately engage when the push rod joint is unlocked, the frame push rod can also be reversed. The frame structure of this invention is simple, with fewer parts, high part strength, easy manufacturing, and a relatively robust overall frame. The foldable seat of this invention unlocks the seat socket by means of a seat joint unlocking mechanism, which unlocks the backrest joint from the seat joint and the seat joint from the armrest joint. At the same time, the relative movement between the backrest joint and the unlocking push block enables the seat to be folded up and the trolley joint to be unlocked. Furthermore, opening the seat in the normal trolley-open state will not affect the normal state of the frame. The overall structure of this invention is simple and enables the frame to be unlocked by the linkage between the seat and the frame, making folding the trolley more convenient and simple. Attached Figure Description

[0015] Figure 1 This is a front view of the frame of the present invention in its normal operating state with the frame being pushed forward.

[0016] Figure 2 This is a front view of the frame of the present invention in its folded state when pushed forward.

[0017] Figure 3 This is a front view of the frame of the present invention in its folded state when pushed forward.

[0018] Figure 4 This is a front view of the normal operating state of the frame of the present invention being pushed in reverse.

[0019] Figure 5 This is a front view of the frame of the present invention in a folded state when pushed in reverse.

[0020] Figure 6 This is a front view of the frame of the present invention in its folded state when pushed in reverse.

[0021] Figure 7 This is a first perspective view showing the exploded state of the central joint of the vehicle frame according to the present invention;

[0022] Figure 8 This is a second perspective view showing the exploded state of the central joint of the vehicle frame according to the present invention;

[0023] Figure 9 This is an exploded front view of the central joint of the vehicle frame according to the present invention;

[0024] Figure 10 This is a front sectional view of the exploded state of the central joint of the vehicle frame of the present invention;

[0025] Figure 11 This is a front view of the assembled state of the central joint of the vehicle frame according to the present invention;

[0026] Figure 12 This is a schematic diagram of the principle of the push rod joint of the frame of the present invention, which pushes the front foot locking component through the frame joint unlocking push pin.

[0027] Figure 13 A perspective view of the unlocking principle of the front leg joint and push rod joint of the frame of the present invention;

[0028] Figure 14 A perspective view of the unlocking principle of the frame center joint of the present invention via a joint unlocking button;

[0029] Figure 15 This is a perspective view of the pushrod joint of the frame of the present invention;

[0030] Figure 16 This is a front view of the vehicle seat in the unfolded state according to the present invention;

[0031] Figure 17 This is a front view of the seat in the folded state of the present invention;

[0032] Figure 18 This is a front view of the stroller in the unfolded state according to the present invention;

[0033] Figure 19 This is a front view of the stroller seat portion of the present invention in its folded state.

[0034] Figure 20 This is a front view of the stroller seat and push rod portion of the present invention in their folded state;

[0035] Figure 21 This is a front view of the stroller of the present invention in its fully folded state;

[0036] Figure 22 This is a perspective view of the central joint of the foldable seat of the present invention;

[0037] Figure 23 This is a front view of the central joint of the foldable seat of the present invention;

[0038] Figure 24This is an exploded perspective view of the central joint of the foldable seat of the present invention.

[0039] Figure 25 This is a front view of the exploded view of the central joint of the foldable seat of the present invention;

[0040] Figure 26 This is a front sectional view of the exploded state of the central joint of the foldable seat of the present invention.

[0041] Figure 27 This is a schematic diagram illustrating the structural principle of adjusting the included angle between the backrest joint and the seat body joint of the present invention via the backrest adjustment latch.

[0042] Figure 28 This is a schematic diagram illustrating the principle of unlocking the seat body joint and seat socket in the backrest joint rotation linkage of the present invention.

[0043] Figure 29 This is a schematic diagram illustrating the linkage and unlocking principle of the seat body joint and armrest joint of the present invention.

[0044] Figure 30 This is a schematic diagram of the principle of the backrest joint rotation being linked to the armrest locking block via the seat socket according to the present invention.

[0045] Figure 31 This is a schematic diagram of the unlocking push block of the present invention in the normal locked state of the central joint on the backrest joint;

[0046] Figure 32 This is a schematic diagram showing the position of the unlocking push block when the backrest joint of the present invention begins to rotate.

[0047] Figure 33 A cross-sectional view of the unlocking push block and the push damping position state when the backrest joint of the present invention begins to rotate;

[0048] Figure 34 This is a schematic diagram showing the position of the unlocking push block when the backrest joint of the present invention is rotated to the unlocked frame joint state;

[0049] Figure 35 This is a schematic diagram showing the position of the unlocking push block when the backrest joint of the present invention is rotated to the fully folded state.

[0050] Figure 36 This is a schematic diagram of the unlocking push block position when the backrest joint of the present invention is rotated in the reverse direction to the state where the backrest is initially opened;

[0051] Figure 37 This is a schematic diagram showing the position of the unlocking push block when the backrest joint of the present invention is rotated in the reverse direction to the fully open backrest state.

[0052] Figure 38 A cross-sectional view of the unlocking push block and the push damping position when the backrest joint of the present invention is rotated in the reverse direction to the fully open backrest state.

[0053] Figure 39 This is a schematic diagram of the position of the unlocking push block when the backrest joint rotates to the normal locked state according to the present invention;

[0054] Figure 40 This is a perspective view of the backrest joint of the present invention;

[0055] Figure 41 This is a perspective view of the unlocking push block of the present invention. Detailed Implementation

[0056] Example: A quick-folding stroller includes a foldable frame 100. The foldable frame 100 includes a front leg portion 1, a rear leg portion 2, a push rod portion 3, a push rod locking member 31, a front leg locking member 11, a push rod locking elastic member 33, a front leg locking elastic member 12, and a frame joint unlocking mechanism. Based on the usage state, the upper ends of the front leg portion 1, the upper ends of the rear leg portion 2, and the lower ends of the push rod portion 3 are respectively provided with a front leg joint 13, a rear leg joint 21, and a push rod joint 32. The push rod joint, the front leg joint 13, and the rear leg joint 21 are sequentially hinged together around a horizontally extending pivot. The push rod locking member 31 and the front leg locking member 11 are each capable of movement within a certain range. The components are installed on the push rod joint and the front foot joint 13. The forward and reverse movement of the push rod locking member 31 can lock or unlock the push rod joint and at least one of the rear foot joint 21 and the front foot joint 13 in the circumferential direction. The forward and reverse movement of the front foot locking member 11 can lock or unlock the front foot joint 13 and the rear foot joint 21 in the circumferential direction. The push rod locking elastic member 33 and the front foot locking elastic member 12 provide elastic holding forces to the push rod locking member 31 and the front foot locking member 11 respectively to keep them in the locked position. The frame joint unlocking mechanism can drive the push rod locking member 31 and the front foot locking member 11 to move in the opposite direction to unlock over the elastic holding forces of the push rod locking elastic member 33 and the front foot locking elastic member 12.

[0057] Under normal use, the push rod locking elastic element 33 and the front foot locking elastic element 12 provide elastic force to the push rod locking element 31 and the front foot locking element 11, so that the push rod joint, the front foot joint 13 and the rear foot joint 21 maintain a circumferentially stopped locked state, which can maintain stable normal use. When the frame is folded and closed, the push rod locking element 31 and the front foot locking element 11 are unlocked by the frame joint unlocking mechanism, which drives the push rod locking element 31 and the front foot locking element 11 to overcome the elastic force and move in the unlocking direction. This allows the push rod part 3, the front foot part 1 and the rear foot part 2 to rotate relative to each other for folding. The entire central joint structure is simple, easy to unlock, has few parts, low manufacturing cost, and is not prone to failure. After the frame is folded and unfolded, the push rod locking element 31 and the front foot locking element 11 automatically lock the push rod joint, the front foot joint 13 and the rear foot joint 21 under the action of the elastic force of the push rod locking elastic element 33 and the front foot locking elastic element 12, so that the frame is in a stable unfolded state.

[0058] The push rod joint has a first push rod joint locking groove 321 on the side wall facing the front foot joint 13. The rear foot joint 21 has a first front foot locking groove 211 on the side wall facing the front foot joint 13. The front foot joint 13 has a second front foot locking groove 131 on the side wall facing the rear foot joint 21. The front foot joint 13 has a second push rod joint locking groove 133 on the side wall facing the push rod joint. One end of the push rod locking member 31 is circumferentially stopped and axially slidable by a set distance, inserted into the first push rod joint locking groove 321. The other end of the push rod locking member 31 is circumferentially stopped and axially slidable, inserted into the second push rod joint locking groove 133. One end of the front foot locking member 11 is circumferentially stopped and axially slidable by a set distance, inserted into the first front foot locking groove 211. The front foot locking member 11 is circumferentially stopped and axially slidable, inserted into the second front foot locking groove 131. The push rod locking elastic member 33... The push rod locking member 31 is provided with an elastic retaining force toward the front foot joint 13, and the front foot locking elastic member 12 is provided with an elastic retaining force toward the front foot locking member 11 toward the front foot joint 13. The frame joint unlocking mechanism can drive the push rod locking member 31 to move toward the unlocking direction. The front foot joint 13 is also provided with at least one axially extending through hole 134. The frame joint unlocking push pin 4 is axially slidably inserted in the through hole 134. The push rod joint is provided with at least one frame joint unlocking inclined surface 322 on the side wall facing the front foot joint 13. One end of the frame joint unlocking push pin 4 is correspondingly pressed against the frame joint unlocking inclined surface 322, and the other end of the frame joint unlocking push pin 4 is pressed against the front foot locking member 11. The rotation of the push rod joint relative to the front foot joint 13 toward the folding direction can force the frame joint unlocking push pin 4 to slide toward the rear foot joint 21 and finally push the front foot locking member 11 out of the second front foot locking tooth groove 131.

[0059] The frame joint unlocking mechanism drives the push rod locking member 31 to move in the unlocking direction. By using the frame joint unlocking push pin 4 to contact the frame joint unlocking inclined surface 322, the front foot locking member 11 can slide axially to unlock the front foot joint 13 and the rear foot joint 21, thereby realizing the entire central joint structure. This structure can make the frame joint unlocking mechanism simpler. In addition, the frame joint structure mechanism can also drive the push rod locking member 31 and the front foot locking member 11 to move separately to unlock the push rod joint and the front foot joint 13, as well as the front foot joint 13 and the rear foot joint 21 respectively. These are equivalent replacement structures that can be easily conceived by those skilled in the art based on this patent and are within the scope of protection of this patent.

[0060] The push rod joint has a push pin guide groove on the side wall facing the front foot joint 13. When the push rod joint rotates relative to the front foot joint 13, the frame joint unlocking push pin 4 can slide along the push pin guide groove. The push pin guide groove has a frame joint unlocking inclined surface 322 at each end along the direction of push rod rotation. After the push rod joint rotates relative to the front foot joint 13 within a set angle range, the frame joint unlocking push pin 4 begins to contact the frame joint unlocking inclined surface 322.

[0061] After the push rod joint and front leg joint 13 are unlocked, the push rod joint can rotate back and forth at a certain angle. Only then does the frame joint unlocking push pin 4 begin to contact the frame joint unlocking ramp 322, which in turn engages the front leg locking member 11. That is, after the push rod joint and front leg joint 13 are connected, rotation within a certain range will not cause the front leg joint 13 to unlock with the rear leg joint 21. This angle range is for the push rod part 3 to perform a direction change operation, without engaging the front leg part 1 and rear leg part 2 of the frame to unlock. The front leg part 1 and rear leg part 2 of the frame remain locked in their normal use state. In other words, when the frame is in normal use, the push rod part 3 can be reversed to change the baby's facing forward or backward.

[0062] The frame joint unlocking mechanism includes a traction cable 42 mechanism. The traction cable 42 mechanism comprises a frame joint unlocking wrench mounted on the push rod portion 3, which can be rotated or slidably installed, and a traction cable 42 extending along the push rod portion 3. Both ends of the traction cable 42 are connected to the frame joint unlocking wrench and the push rod locking member 31, respectively. Rotating or sliding the frame joint unlocking wrench can pull the push rod locking member 31 in the opposite direction via the traction cable 42. By operating the frame joint unlocking wrench on the frame push rod portion 3, the push rod locking member 31 can be pulled in the opposite direction via the traction cable 42 to unlock the push rod joint. Positioning the frame joint unlocking wrench on the push rod portion 3 facilitates user operation, making it convenient for reversing the push rod portion 3 and for folding the frame. Furthermore, the user does not need to bend over during the unlocking process.

[0063] The push rod locking member 31 has a push rod locking gear 311 at one end and a push rod locking pin 312 at the other end. The push rod locking gear 311 is circumferentially stopped and axially slidable by a set distance, inserted into the first push rod joint locking groove 321. The push rod locking gear 311 is circumferentially stopped and axially slidable, inserted into the second push rod joint locking groove 133. The rear foot joint 21 has a push rod locking slot 212 on its side wall facing the front foot joint 13. The front foot joint 13 also has a first clearance hole 132. The push rod locking pin 312 at the other end of the push rod locking member 31 rotatably passes through the first clearance hole 132 and is circumferentially stopped and axially slidable, inserted into the push rod locking slot 212. The elastic retaining force of the push rod locking elastic member 33 allows the push rod locking gear 311 to engage and lock with the second push rod joint locking groove 133, while simultaneously locking the push rod. The pin 312 is engaged and locked with the push rod locking slot 212. The frame joint unlocking mechanism drives the push rod locking member 31 to move in the opposite direction, which can cause the push rod locking gear 311 and the push rod locking pin 312 to simultaneously exit the second push rod joint locking groove 133 and the push rod locking slot 212. The frame joint unlocking mechanism also includes a frame joint unlocking button 41. The frame joint unlocking button 41 is slidably installed on the side wall of the rear foot joint 21 behind the front foot joint 13. The rear foot joint 21 is provided with an axial through hole 213. The frame joint unlocking button 41 is provided with an unlocking push rod 411. The unlocking push rod 411 is slidably inserted into the axial through hole 213 of the rear foot joint 21, and the end of the unlocking push rod 411 is tightly pressed against the other end surface of the push rod locking member 31. Pressing the frame joint unlocking button 41 can cause the unlocking push rod 411 to slide axially and push the push rod locking member 31 to move in the opposite direction to unlock.

[0064] The push rod locking component 31 is designed with a push rod locking gear 311 at one end and a push rod locking pin 312 at the other end. On the one hand, the push rod joint can be locked or unlocked simultaneously with the front leg joint 13 and the rear leg joint 21. The frame center joint can be unlocked through the traction cable 42 mechanism, or the frame can be unlocked through the frame joint unlocking button 41. The unlocking method can be selected according to the user's needs. In order to facilitate the installation of the frame joint unlocking button 41 on the rear leg joint 21, a rear leg joint 21 cover 22 can be installed on the side of the rear leg joint 21 away from the front leg joint 13. A first through hole is provided on the rear leg joint 21 cover, which is directly opposite to the unlocking push rod 411 on the frame joint unlocking button 41, to avoid the frame joint unlocking button 41. The unlocking rod 411 can also be provided with a second through hole on the outer cover of the rear foot joint 21 that is misaligned with the unlocking rod 411 on the frame joint unlocking button 41. A cantilever with a backlash point can be provided on the frame joint unlocking button 41, or a bolt or rivet with an outwardly flared head can be provided on the frame joint unlocking button 41 by screwing or riveting. The backlash point on the cantilever, the head of the stud, or the head of the rivet can stop on the side wall of the outer cover of the rear foot joint 21 facing the rear foot joint 21, thereby limiting the axial sliding of the frame joint unlocking button 41. The outer cover of the rear foot joint 21 can be screwed onto the rear foot joint 21 or riveted to the rear foot joint 21. This makes it easy for the frame joint unlocking button 41 to slide axially a set distance on the rear foot joint 21.

[0065] A foldable seat 200 is also provided, comprising a seat portion 5, a backrest portion 6, a front armrest portion 7, a seat socket 8, a backrest adjustment latch 61, a seat locking element 51, an armrest locking block 71, a seat joint unlocking mechanism 10, a latch return elastic element 62, a locking element elastic element 52, and a locking block elastic element 72. A seat joint 53 is provided at the rear end of the seat portion 5. The backrest portion 6 and the front armrest portion 7 are respectively provided with a backrest joint 63 and a front armrest joint 73 at their lower ends. The seat socket 8, armrest joint, seat joint 53, and backrest joint 63 are sequentially hinged together around a horizontally extending pivot. The backrest adjustment latch 61, seat locking element 51, and armrest locking block 71 are respectively mounted on the backrest joint 63, seat socket 8, and seat joint 53, respectively, and can move within a certain range. The forward and reverse movement of the backrest adjustment latch 61 can lock or unlock the backrest joint 63 and seat joint 53 in the circumferential direction. The reverse movement can lock or unlock the seat socket 8 and the seat joint 53 in the circumferential direction. The forward and reverse movement of the armrest locking block 71 can lock or unlock the armrest joint and the seat joint 53 in the circumferential direction. The lock tongue reset elastic element 62, the locking element elastic element 52 and the locking block elastic element 72 respectively provide elastic holding force to keep the backrest adjustment lock tongue 61, the seat locking element 51 and the armrest locking block 71 in the locked position. The seat joint unlocking mechanism 10 can drive the backrest adjustment lock tongue, the seat locking element 51 and the armrest locking block 71 to overcome the elastic holding force of the lock tongue reset elastic element 62, the locking element elastic element 52 and the locking block elastic element 72 and move in the opposite direction to unlock. The seat socket 8 has a seat mounting slot 81 with an opening facing downward on the side facing away from the armrest joint. The rear foot joint 21 has a seat mounting protrusion 214 on the side wall facing away from the front foot joint 13. The seat mounting slot 81 can be sleeved on the outside of the seat mounting protrusion 214 and fastened and fixed thereto.

[0066] A foldable seat 200 is installed on the foldable frame 100. The seat joint unlocking mechanism 10 drives the seat locking component 51, armrest locking block 71, and backrest adjustment latch 61 to move in opposite directions. This unlocks the seat socket 8 with the seat joint 53, the seat joint 53 with the armrest joint, and the seat joint 53 with the backrest joint 63, thereby unlocking the seat center joint and completing the folding of the foldable seat 200. The foldable seat 200 is fixedly installed on the foldable frame 100 by engaging the seat mounting slot 81 with the seat mounting protrusion 214 on the frame. After installation, both the frame and the seat can be folded, achieving the folding and folding of the entire bicycle. The foldable seat 200 can also be detached from the frame for independent use, and can also be folded and folded when used alone.

[0067] The seat joint 53 has at least one backrest joint adjustment groove 531 on the end facing the backrest joint 63. Two or more backrest joint adjustment grooves 531 are arranged at intervals along the rotation direction of the backrest joint 63. The backrest adjustment latch 61 can be inserted into and withdrawn from any backrest joint 63 groove by forward and reverse movement, realizing the locking or unlocking of the backrest joint 63 and the seat joint 53 in the circumferential direction. The latch reset elastic member 62 provides an elastic holding force to the backrest adjustment latch 61 to move in the direction of the backrest joint adjustment groove 531. The seat joint unlocking mechanism 10 can drive the backrest adjustment latch 61 to move forward and reverse. The seat joint 53 has a first seat on the side facing away from the backrest joint 63. The seat socket 8 has a second seat joint locking groove 82 and a first linkage inclined surface 83 on the side facing the seat joint 53. The armrest joint has a second clearance hole 731 and a second armrest joint locking slot 732 eccentrically arranged with its rotation axis. One end of the seat locking member 51 is circumferentially stopped and axially slidable by a set distance, inserted into the second seat joint locking groove 82. The other end of the seat locking member 51 passes through the first clearance hole 132 and is circumferentially stopped and axially slidable, inserted into the first seat joint locking groove 532. The locking member elastic member 52 provides the seat locking member 51 with... An elastic retaining force is provided for the armrest locking block 71 to move toward the first seat joint locking groove 532. One end of the armrest locking block 71 is circumferentially stopped and axially slidable by a set distance, inserted into the first armrest joint locking slot 533. The armrest locking block 71 has a U-shaped structure, with its other end forming two bifurcated side walls. One side wall 711 of the U-shaped structure of the armrest locking block is inserted into the second armrest joint locking slot 732, and the other side wall 712 of the U-shaped structure passes through the second clearance hole 731 and contacts the first linkage inclined surface 83. The locking block elastic element 72 provides an elastic retaining force for the armrest locking block 71 to move toward the second armrest joint locking slot 732. The seat socket... The relative seat joint 53 can be rotated in the folding direction to force the armrest locking block 71 out of the first armrest joint locking slot 533 through the first linkage inclined surface 83. The seat joint 53 is also provided with a third clearance hole 534. The backrest joint 63 is provided with a linkage protrusion 631 on the side facing the seat joint 53. A second linkage inclined surface 6311 is formed on the linkage protrusion 631. The seat locking member 51 is provided with a third linkage inclined surface 511 on the end face facing the seat joint 53. The second linkage inclined surface 6311 and the third linkage inclined surface 511 are in close contact. The rotation of the backrest joint 63 in the folding direction can force the seat locking member 51 out of the first seat joint locking groove 532.

[0068] The seat joint unlocking mechanism 10 drives the backrest adjustment latch 61 to move, causing it to disengage from the backrest joint adjustment groove 531 on the seat joint 53. This unlocks the backrest joint 63 and the seat joint 53, allowing the backrest joint 63 to rotate relative to the seat joint 53. By inserting the backrest adjustment latch 61 into different backrest joint adjustment grooves 531, the angle between the backrest component and the seat component can be adjusted, thereby adjusting the backrest angle of the seat to meet the different riding needs of infants and young children. Alternatively, after unlocking the backrest joint 63 and the seat joint 53, pushing the backrest joint 63 forward will fold the backrest component and the seat component together to fold the seat.

[0069] The seat joint unlocking mechanism 10 may include a wrench mounted on the backrest component that can be rotated or slidably, and a cable passing through the backrest component. One end of the cable is connected to the wrench, and the other end is connected to the backrest adjustment latch 61. In this way, by rotating or sliding the wrench, the cable can be used to pull the backrest adjustment latch 61 to perform radial extension and retraction on the backrest joint 63. The seat joint unlocking mechanism 10 may also be other structures, such as a knob and a gear and rack transmission mechanism, as long as it can drive the backrest adjustment latch 61 to slide in the opposite direction.

[0070] During the forward rotation of the backrest joint 63, the second linkage inclined surface 6311 on the linkage protrusion 631 of the backrest joint 63 rotates relative to the third linkage inclined surface 511 on the seat locking member 51, thereby causing the seat locking member 51 to slide axially and disengage from the first seat joint locking groove 532 on the seat joint 53, thus unlocking the seat socket 8 from the seat joint 53. Pushing the seat joint 53 downward causes relative rotation between the other side wall 712 of the armrest locking block U-shaped structure and the first linkage inclined surface 83 on the seat socket 8, thereby forcing the armrest... When the U-shaped side wall 711 of the locking block disengages from the first armrest joint locking slot 533 on the armrest joint, the armrest joint and seat joint 53 are unlocked. This fully unlocks the backrest joint 63, seat joint 53, armrest joint and seat socket of the foldable seat 200, realizing the folding of the seat. With the above mechanism, the seat joint unlocking mechanism 10 can be operated to fully unlock the center joint of the seat while pushing the backrest part 6 forward, realizing the rapid folding of the entire seat. The above mechanism has a simple structure, few parts and is easy to operate.

[0071] The backrest joint 63 has a fourth linkage inclined surface 6321 at an angle to its axial direction on the side wall facing the seat socket 8. The seat socket 8 also has a guide hole 84 facing the frame joint unlock button 41. An unlocking push block 9 is axially slidably inserted into the guide hole 84. One end of the unlocking push block 9 passes through the second clearance hole 731 on the armrest joint and the third clearance hole 534 on the seat joint 53 and contacts the fifth linkage inclined surface 921. A push block reset elastic element 91 is also provided. The push block reset elastic element 91 provides an elastic holding force to the unlocking push block 9 in the direction of the backrest joint 63. When the foldable seat 200 is folded, the backrest joint 63 rotates relative to the seat socket 8, which can force the unlocking push block 9 to slide in the direction of the seat socket 8 through the fifth linkage inclined surface 921. This causes the other end of the unlocking push block 9 to slide along the guide hole 84 and extend out of the seat socket 8 by a set length. The other end of the unlocking push block 9 extending out of the seat socket 8 can press the frame joint unlock button 41 to unlock the frame.

[0072] During the folding process of the seat, rotating the backrest joint 63 also triggers the fourth linkage inclined surface 6321 to unlock the push block 9, causing it to slide axially. This, in turn, presses the frame joint unlock button 41, unlocking the frame center joint. In other words, the frame center joint structure is automatically linked to fold the frame during the seat folding process. With one-button operation, both the seat and the frame center joint can be unlocked, allowing the seat and frame to fold and retract synchronously. This convenient operation avoids the need to operate multiple unlock switches to unlock the seat and frame separately, improving the user's convenience and efficiency in folding the bicycle.

[0073] The backrest joint 63 has an arc-shaped protrusion 632 on one side wall facing the seat socket 8. A fourth linkage inclined surface 6321 is provided on one side wall of the arc-shaped protrusion 632. An arc-shaped protrusion 92 is provided on one side wall of the unlocking push block 9. A fifth linkage inclined surface 921 matching the fourth linkage inclined surface 6321 is provided on the side wall of the arc-shaped protrusion 92. When the arc-shaped protrusion 92 rotates relative to the arc-shaped protrusion 632, the fifth linkage inclined surface 921 on the arc-shaped protrusion 92 can slide along the fourth linkage inclined surface 6321 on the side wall of the arc-shaped protrusion 632, thereby allowing the arc-shaped protrusion 92 to finally slide from the bottom of the arc-shaped protrusion 632 to the top of the arc-shaped protrusion 632. The backrest joint 63 is tightly connected to the seat joint 53, and the armrest joint is fitted onto the seat joint 53. The linkage protrusion 631 and the arc-shaped protrusion 632 on the backrest joint 63 are both accommodated in the third clearance hole 534 on the seat joint 53, saving axial space. When the backrest joint 63 is rotated, the arc-shaped protrusion 92 on one side wall of the unlocking push block 9 rotates along the surface of the arc-shaped protrusion 632. When the fifth linkage inclined surface 921 on it is in close contact with the fourth linkage inclined surface 6321 on the arc-shaped protrusion 632 and rotates relative to it, the unlocking push block 9 will move axially.

[0074] The backrest joint 63 has a concentric protruding ring 633 on the side wall facing the seat socket 8. A linkage protrusion 631 is located on the end face of the protruding ring 633. An arc-shaped protrusion 632 is located on the outer side of the end of the protruding ring 633, and a gap exists between the arc-shaped protrusion 632 and the side wall facing the seat socket 8 that allows the arc-shaped protrusion 92 to be accommodated. A push-damping mechanism 634 is also provided. The push-damping mechanism 634 includes a push-damping 634, a push-damping elastic element 635, and a push-damping cover 636. The backrest joint 63 has a T-shaped perforation 637. The push-damping 634 is a T-shaped block structure. The smaller diameter end of the push-damping 634 forms a cone or ball-shaped structure with a gradually decreasing radial dimension. The smaller diameter end of the push-damping 634 can extend into the backrest joint 63 facing the seat socket 8. A distance is set on one side surface of the seat socket 8. The stepped surface between the two ends of the push damper 634 stops on the stepped surface between the two ends of the T-shaped perforation 637. The push damper cover 636 is fixedly installed on the side of the backrest joint 63 facing away from the seat socket 8. The push damper elastic element 635 is tightly clamped between the push damper cover 636 and the push damper 634 to provide the push damper 634 with an elastic holding force in the direction of the seat socket 8. One end face of the unlock push block 9 is provided with a pre-push guide slope 922. When the backrest joint 63 rotates relative to the seat socket 8 in the folding direction, the pre-push guide slope 922 on one end face of the unlock push block 9 first contacts the side wall of the push damper 634 with the smaller diameter, so that the arc-shaped protrusion 92 moves in advance along the axial direction of the backrest joint 63 to the position directly opposite the arc-shaped protrusion 632.

[0075] The outer circumference of the convex ring 633 forms a guide for the arc-shaped protrusion 92 on the unlocking push block 9. When the backrest joint 63 is in the normal locked state, the bottom surface of the unlocking push block 9 is on the bottom surface of the backrest joint 63. At this time, after we unlock the backrest adjustment latch 61, the backrest joint 63 begins to rotate, and the fourth linkage inclined surface 6321 on the backrest joint 63 and the fifth linkage inclined surface 921 on the unlocking push block 9 begin to approach each other, preparing to form relative movement. At this time, the push damping 634 is in the protruding state, which just lifts the unlocking push block 9 upward, causing the fifth linkage of the locking push block to be activated. The ramp 921 can climb onto the fourth linkage ramp 6321 of the backrest joint 63; the backrest joint 63 continues to rotate until the bottom surface of the unlocking push block 9 is completely located on the top surface of the fourth linkage ramp 6321 of the backrest joint 63, at which point the frame can be unlocked (that is, the top of the unlocking push block 9 and the pressing of the trolley joint unlocking button unlock the center joint of the trolley frame); until the backrest part 6 is completely folded, the unlocking push block 9 completely crosses the top surface of the arc-shaped boss 632, and under the action of the push block reset elastic element 91, the unlocking push block 9 again... The backrest is now back to the state where the bottom surface of the unlocking push block 9 is aligned with the bottom surface of the backrest joint 63. When we open the backrest, we rotate the backrest joint 63 in the opposite direction, and the arc-shaped protrusion 632 on the backrest joint 63 can pass through the slot of the unlocking push block 9 (that is, the arc-shaped protrusion 92 on the unlocking push block 9 slides along the gap between the bottom surface of the backrest joint 63 and the arc-shaped protrusion 632 on the backrest joint 63). As we continue to slowly open the backrest joint 63, the bottom surface of the unlocking push block 9 presses the pushing damper 634 flat with the bottom surface of the backrest joint 63, making the arc-shaped protrusion of the backrest joint 63... The protrusion 92 can rotate out perfectly; then it returns to the normal open position of the seat (that is, the unlocking push block 9 is only pushed out when the backrest is closed, but when it is normally open, the bottom surface of the unlocking push block 9 is always on the bottom surface of the backrest joint 63). To improve the comfort of the seat, a leg rest part 50 can be hinged to the seat part 5 to support the infant's legs. The leg rest part and the front end of the seat part 5 are hinged to each other through frictional resistance or damping components to maintain the relative angle and rotate and close relative to each other. At the same time, a canopy rod part 60 can be hinged to the lower end of the backrest part 6 for installing such a canopy. The canopy rod part can also maintain and adjust different angles with the backrest part 6 through frictional resistance or damping components, so as to adjust the sunshade to different shading ranges.

Claims

1. A quick-folding stroller, characterized in that: The bicycle includes a foldable frame (100), which comprises a front leg portion (1), a rear leg portion (2), a push rod portion (3), a push rod locking member (31), a front leg locking member (11), a push rod locking elastic member (33), a front leg locking elastic member (12), and a frame joint unlocking mechanism. Based on the usage state, the upper end of the front leg portion, the upper end of the rear leg portion, and the lower end of the push rod portion are respectively provided with a front leg joint (13), a rear leg joint (21), and a push rod joint (32). The push rod joint, the front leg joint, and the rear leg joint are sequentially hinged together around a horizontally extending pivot. The push rod locking member and the front leg locking member are... The push rod locking mechanism is mounted on the push rod joint and the front foot joint, and can move within a certain range. The forward and reverse movement of the push rod locking mechanism can lock or unlock the push rod joint and at least one of the rear foot joint and the front foot joint in the circumferential direction. The forward and reverse movement of the front foot locking mechanism can lock or unlock the front foot joint and the rear foot joint in the circumferential direction. The push rod locking elastic element and the front foot locking elastic element provide elastic holding force to the push rod locking mechanism and the front foot locking mechanism respectively to keep them in the locked position. The frame joint unlocking mechanism can drive the push rod locking mechanism and the front foot locking mechanism to move in the opposite direction to unlock over the elastic holding force of the push rod locking elastic element and the front foot locking elastic element.

2. The quick-folding stroller according to claim 1, characterized in that: The push rod joint has a first push rod joint locking groove (321) on the side wall facing the front foot joint, and a first front foot locking groove (211) on the side wall facing the front foot joint. The front foot joint has a second front foot locking groove (131) on the side wall facing the rear foot joint, and a second push rod joint locking groove (133) on the side wall facing the push rod joint. One end of the push rod locking member is circumferentially stopped and axially slidable by a set distance, inserted into the first push rod joint locking groove. The other end of the push rod locking member is circumferentially stopped and axially slidable, inserted into the second push rod joint locking groove. One end of the front foot locking member is circumferentially stopped and axially slidable by a set distance, inserted into the first front foot locking groove, and the front foot locking member is circumferentially stopped and axially slidable, inserted into the second front foot locking groove. The push rod locking spring... The elastic element provides the push rod locking element with an elastic holding force toward the front foot joint, and the front foot locking elastic element provides the front foot locking element with an elastic holding force toward the front foot joint. The frame joint unlocking mechanism can drive the push rod locking element to move toward the unlocking direction. The front foot joint is also provided with at least one axially extending through hole (134). The frame joint unlocking push pin (4) is axially slidably inserted in the through hole. The push rod joint is provided with at least one frame joint unlocking inclined surface (322) on the side wall facing the front foot joint. One end of the frame joint unlocking push pin is correspondingly pressed against the frame joint unlocking inclined surface, and the other end of the frame joint unlocking push pin is pressed against the front foot locking element. The push rod joint can rotate relative to the front foot joint toward the folding direction to force the frame joint unlocking push pin to slide toward the rear foot joint and finally push the front foot locking element out of the second front foot locking tooth groove.

3. The quick-folding stroller according to claim 2, characterized in that: The push rod joint has a push pin guide groove on the side wall facing the front foot joint. When the push rod joint rotates relative to the front foot joint, the frame joint unlocking push pin can slide along the push pin guide groove. The push rod guide groove has a frame joint unlocking ramp at each end along the direction of push rod rotation. After the push rod joint rotates relative to the front foot joint within a set angle range, the frame joint unlocking push pin begins to contact the frame joint unlocking ramp.

4. The quick-folding stroller according to claim 2, characterized in that: The frame joint unlocking operation component includes a traction cable mechanism, which includes a frame joint unlocking wrench that can be rotated or slidably mounted on the push rod portion and a traction cable (42) extending along the push rod portion. The two ends of the traction cable are respectively connected to the frame joint unlocking wrench and the push rod locking member. Rotating or sliding the frame joint unlocking wrench can pull the push rod locking member to move in the opposite direction through the traction cable.

5. The quick-folding stroller according to claim 2, characterized in that: One end of the push rod locking component is provided with a push rod locking gear (311), and the other end of the push rod locking component is provided with a push rod locking pin (312). One end of the push rod locking gear is inserted into the first push rod joint locking tooth groove, which is circumferentially stopped and axially slidable by a set distance. The push rod locking gear is inserted into the second push rod joint locking tooth groove, which is circumferentially stopped and axially slidable. The rear foot joint is also provided with a push rod locking slot (212) on the side wall facing the front foot joint. The front foot joint is also provided with a first clearance hole (132). The push rod locking pin at the other end of the push rod locking component can rotate through the first clearance hole and is inserted into the push rod locking slot, which is circumferentially stopped and axially slidable. The elastic holding force of the push rod locking elastic element can make the push rod locking gear and the second push rod joint locking tooth groove lock at the same time. When the push rod locking pin is engaged and locked with the push rod locking slot, the frame joint unlocking mechanism drives the push rod locking member to move in the opposite direction, which can cause the push rod locking gear and the push rod locking pin to exit the second push rod joint locking tooth groove and the push rod locking slot simultaneously. The frame joint unlocking mechanism also includes a frame joint unlocking button (41). The frame joint unlocking button can slide along the axis for a set distance and is installed on the side wall of the rear foot joint behind the front foot joint. The rear foot joint is provided with an axial through hole (213). The frame joint unlocking button is provided with an unlocking push rod (411). The unlocking push rod can slide into the axial through hole of the rear foot joint, and the end of the unlocking push rod is tightly against the other end surface of the push rod locking member. Pressing the frame joint unlocking button can cause the unlocking push rod to slide axially and push the push rod locking member to move in the opposite direction to unlock.

6. The quick-folding stroller according to claim 5, characterized in that: The bicycle also includes a foldable seat (200), which comprises a seat portion (5), a backrest portion (6), a front armrest portion (7), a seat socket (8), a backrest adjustment latch (61), a seat locking element (51), an armrest locking block (71), a seat joint unlocking mechanism (10), a latch reset elastic element (62), a locking element elastic element (52), and a locking block elastic element (72). The rear end of the seat portion is provided with a seat joint (53), and the lower ends of the backrest portion and the front armrest portion are respectively provided with a backrest joint (63) and a front armrest joint (73). The seat socket, armrest joint, seat joint, and backrest joint are sequentially hinged together around a horizontally extending pivot. The backrest adjustment latch, seat locking element, and armrest locking block are respectively installed on the backrest joint, seat socket, and seat joint, which can move within a certain range. The forward and reverse movement of the backrest adjustment latch can circumferentially connect the backrest joint and the seat joint. The seat locking mechanism can lock or unlock the seat socket and seat joint in a circumferential direction by moving forward and backward. The armrest locking block can lock or unlock the armrest joint and seat joint in a circumferential direction by moving forward and backward. The lock tongue reset elastic element, the locking element elastic element, and the locking block elastic element provide elastic holding forces to the backrest adjustment lock tongue, seat locking element, and armrest locking block to keep them in the locked position. The seat joint unlocking mechanism can drive the backrest adjustment lock tongue, seat locking element, and armrest locking block to move in the opposite direction to unlock by overcoming the elastic holding forces of the lock tongue reset elastic element, locking element elastic element, and locking block elastic element. The seat socket has a seat mounting slot (81) with an opening facing downward on the side opposite to the armrest joint. The rear foot joint has a seat mounting protrusion (214) on the side wall opposite to the front foot joint. The seat mounting slot can be sleeved on the outside of the seat mounting protrusion and fastened and fixed thereto.

7. The quick-folding stroller according to claim 6, characterized in that: The seat joint has at least one backrest joint adjustment groove (531) on the end facing the backrest joint. Two or more backrest joint adjustment grooves are arranged at intervals along the rotation direction of the backrest joint. The forward and reverse movement of the backrest adjustment latch can insert into and retract any one of the backrest joint grooves to lock or unlock the backrest joint and the seat joint in the circumferential direction. The latch reset elastic element provides the backrest adjustment latch with an elastic holding force for movement in the direction of the backrest joint adjustment groove. The seat joint unlocking mechanism can drive the backrest adjustment latch to move forward and reverse. The seat joint has a first seat joint locking groove on the side facing away from the backrest joint. 532) and a first armrest joint locking slot (533), the seat socket is provided with a second seat joint locking groove (82) and a first linkage inclined surface (83) on the side facing the seat joint, the armrest joint is provided with a second clearance hole (731) and a second armrest joint locking slot (732) eccentrically arranged with its rotation axis, one end of the seat locking member is inserted into the second seat joint locking groove with circumferential stop and axial sliding capability by a set distance, the other end of the seat locking member is inserted into the first seat joint locking groove with circumferential stop and axial sliding capability after passing through the first clearance hole, and the locking member elastic element provides seat The locking element provides an elastic retaining force for movement toward the locking groove of the first seat joint. One end of the armrest locking block is circumferentially stopped and axially slidable by a set distance, inserted into the first armrest joint locking slot. The armrest locking block has a U-shaped joint structure, with its other end forming two bifurcated side walls. One side wall (711) of the U-shaped armrest locking block is inserted into the second armrest joint locking slot, and the other side wall (712) of the U-shaped armrest locking block passes through the second clearance hole and contacts the first linkage inclined surface. The locking block elastic element provides an elastic retaining force for the armrest locking block to move toward the second armrest joint locking slot. The seat socket can be rotated relative to the seat joint in the folding direction to force the armrest locking block out of the first armrest joint locking slot through the first linkage inclined surface. The seat joint is also provided with a third clearance hole (534). The backrest joint is provided with a linkage protrusion (631) on the side facing the seat joint. A second linkage inclined surface (6311) is formed on the linkage protrusion. The seat locking member is provided with a third linkage inclined surface (511) on the end face facing the seat joint. The second linkage inclined surface and the third linkage inclined surface are in close contact. The backrest joint can be rotated in the folding direction to force the seat locking member out of the first seat joint locking groove.

8. The quick-folding stroller according to claim 7, characterized in that: The backrest joint is provided with a fourth linkage inclined surface (6321) at an angle to its axial direction on the side wall facing the seat socket. The seat socket is also provided with a guide hole (84) facing the unlock button of the frame joint. An unlock push block (9) is inserted into the guide hole and can slide axially. One end of the unlock push block passes through the second clearance hole on the armrest joint and the third clearance hole on the seat joint and contacts the fifth linkage inclined surface. A push block reset elastic element (91) is also provided. The push block reset elastic element provides the unlock push block with an elastic holding force in the direction of the backrest joint. When the foldable seat is folded, the rotation of the backrest joint relative to the seat socket can force the unlock push block to slide in the direction of the seat socket through the fifth linkage inclined surface, thereby causing the other end of the unlock push block to slide along the guide hole and extend out of the seat socket by a set length. The other end of the unlock push block extending out of the seat socket can press the frame joint unlock button to unlock the frame.

9. The quick-folding stroller according to claim 8, characterized in that: The backrest joint has an arc-shaped protrusion (632) on the side wall facing the seat socket. A fourth linkage inclined surface is provided on the side wall of the arc-shaped protrusion. An arc-shaped protrusion (92) is provided on one side wall of the unlocking push block. A fifth linkage inclined surface (921) matching the fourth linkage inclined surface is provided on the side wall of the arc-shaped protrusion. When the arc-shaped protrusion and the arc-shaped protrusion rotate relative to each other, the fifth linkage inclined surface on the arc-shaped protrusion can slide along the fourth linkage inclined surface on the side wall of the arc-shaped protrusion, thereby allowing the arc-shaped protrusion to finally slide from the bottom of the arc-shaped protrusion to the top of the arc-shaped protrusion.

10. The quick-folding stroller according to claim 9, characterized in that: The backrest joint has a concentric protruding ring (633) on the side wall facing the seat socket. The linkage protrusion is located on the end face of the protruding ring, and the arc-shaped protrusion is located on the outer side of the end of the protruding ring. There is a gap between the arc-shaped protrusion and the side wall facing the seat socket of the backrest joint that can accommodate the arc-shaped protrusion. A push-damping mechanism is also provided. The push-damping mechanism includes a push-damping (634), a push-damping elastic element (635), and a push-damping cover (636). The backrest joint has a T-shaped perforation (637). The push-damping is a T-shaped block structure. The end with a smaller diameter of the push-damping forms a cone or ball head structure with a gradually decreasing radial dimension. The end with a smaller diameter of the push-damping can extend to The backrest joint is positioned at a distance from the side of the seat socket. The stepped surface between the two ends of the push damper stops on the stepped surface between the two ends of the T-shaped perforation. The push damper cover is fixedly installed on the side of the backrest joint facing away from the seat socket. The push damper elastic element is tightly clamped between the push damper cover and the push damper to provide elastic holding force towards the seat socket. A pre-push guide slope (922) is provided on one end of the unlock push block. When the backrest joint rotates relative to the seat socket in the folding direction, the pre-push guide slope on one end of the unlock push block first contacts the side wall of the push damper with the smaller diameter, so that the arc-shaped protrusion moves in advance along the axial direction of the backrest joint to the position directly opposite the arc-shaped protrusion.

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