CN108909813B - Quick folding baby carriage - Google Patents

Abstract

The application relates to a but quick folding bassinet, including interconnect's seat structure and frame structure, frame structure includes articulated preceding frame, back frame and handrail frame each other, and frame structure still includes: the linkage folding joint is arranged at the joint hinge position of the front frame, the rear frame and the armrest frame; a locking connection mechanism arranged between the front frame and the rear frame; the first folding control mechanism is arranged on the rear frame; the seat structure comprises an upper seat frame, a lower seat frame, a front seat frame, seat frame folding joints and a second folding control mechanism, wherein the upper seat frame, the lower seat frame and the front seat frame are mutually hinged through the seat frame folding joints and mutually lock and position the upper seat frame, the lower seat frame and the front seat frame when the seat structure is unfolded and used, and the second folding control mechanism is connected with the seat frame folding joints to control the seat frame folding joints to unlock and fold. This application is through structural optimization, and is folding more abundant, folding convenient and fast, saves space after folding, is convenient for deposit more and carry.

Description

Quick folding baby carriage

[ field of technology ]

The application relates to the field of strollers, and in particular to a quick-folding stroller.

[ background Art ]

Foldable strollers have been popular in various households, and existing foldable strollers generally include a frame structure and a seat structure, and only the frame structure may be folded, so that the use of the strollers in households, traveling, carrying, etc. is more convenient, space-saving, and a more optimized folding structure is required.

[ invention ]

For solving above-mentioned technical problem, the aim at of this application provides but quick folding bassinet, and it is more abundant through the optimization of structure, folding convenient and fast, saves space after folding, is convenient for deposit more and carry.

The application is realized by the following technical scheme:

the utility model provides a but quick folding bassinet, includes interconnect's seat structure and frame structure, frame structure includes articulated preceding frame, back frame and handrail frame each other, frame structure still includes:

the linkage folding joint is arranged at a joint hinge part of the front frame, the rear frame and the armrest frame and is used for driving the front frame and the armrest frame to rotate relatively at the same time;

a locking connection mechanism provided between the front frame and the rear frame for locking the frame structure in a deployed use state;

a first folding control mechanism provided on the rear frame for locking or unlocking the locking connection mechanism to expand or fold the frame structure;

the seat structure comprises an upper seat frame, a lower seat frame, a front seat frame, a seat frame folding joint and a second folding control mechanism, wherein the upper seat frame, the lower seat frame and the front seat frame are mutually hinged through the seat frame folding joint and mutually lock and position the upper seat frame, the lower seat frame and the front seat frame when the seat structure is unfolded and used, and the second folding control mechanism is connected with the seat frame folding joint to control the seat frame folding joint to unlock and fold.

The quick folding baby carrier is characterized in that the locking connecting mechanism comprises a locking connecting piece, a sliding rod arranged in parallel with the rear frame and a locking block slidably connected to the sliding rod, one end of the locking connecting piece is hinged to the front frame, the other end of the locking connecting piece is hinged to the locking block, and a locking hole is formed in the locking block.

Compared with the prior art, the application has the following advantages:

this application is through structural optimization, and is folding more abundant, folding convenient and fast, saves space after folding, is convenient for deposit more and carry.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded perspective view of a stroller in an extended use position according to an embodiment of the present disclosure;

FIGS. 2 and 3 are perspective views illustrating two different folded states according to an embodiment of the present application;

fig. 4 is an enlarged view of a portion a in fig. 1;

Fig. 5 is an enlarged view of a portion B in fig. 2;

FIG. 6 is a partial cross-sectional view taken along the direction K in FIG. 4;

FIG. 7 is a schematic control diagram of the first folding control mechanism to the second push-pull connector according to the embodiment of the present application;

FIG. 8 is a schematic diagram illustrating connection between the forced locking structure and the forced unlocking structure according to the embodiment of the present application;

fig. 9 to 11 are schematic perspective views of a first folding control mechanism according to an embodiment of the present application at different degrees of separation and at different angles;

FIG. 12 is a schematic view showing the positions of the second rotary knob and the second latch in the unfolded use state of the seat structure according to the embodiment of the present application;

FIGS. 13 and 14 are two different angles of exploded perspective views of the chair frame folding joint according to the embodiments of the present application;

fig. 15 is an enlarged view of fig. 13 at section E;

fig. 16 is an enlarged view of fig. 13 at section F;

FIG. 17 is an exploded perspective view of the linked folding joint of an embodiment of the present application;

FIG. 18 is a schematic view showing an unfolded state of the linked folding joint according to the embodiment of the present application;

FIG. 19 is a schematic view showing a folding state of the linkage folding joint according to the embodiment of the present application;

FIGS. 20 and 21 are two different angles of exploded perspective views of a second fold control mechanism according to an embodiment of the present application;

Fig. 22 to 24 are schematic views showing a state of the spanner in the second folding control mechanism during folding of the seat structure according to the embodiment of the present application;

FIG. 25 is a schematic illustration of the connection of the primary brake and the secondary brake according to an embodiment of the present application;

FIGS. 26 and 27 are two different angled exploded isometric views of a main brake of an embodiment of the present application, wherein the rear frame and the first rear wheel are shown simultaneously in FIG. 26, and the rear frame is shown simultaneously in FIG. 27;

FIG. 28 is an exploded perspective view of a secondary brake according to an embodiment of the present application;

FIG. 29 is a cross-sectional view taken along the J direction in FIG. 1;

fig. 30 is an enlarged view of the portion H of fig. 29;

fig. 31 is an enlarged view of a portion G of fig. 27;

FIG. 32 is a schematic view of a pedal block according to an embodiment of the present disclosure;

FIG. 33 is an exploded perspective view of the armrest frame of the present application;

fig. 34 is an enlarged view of a portion C in fig. 33;

fig. 35 is an enlarged view of a portion D in fig. 33.

[ detailed description ] of the invention

In order to make the technical problems, technical schemes and beneficial effects solved by the application more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

As shown in fig. 1 to 35, the embodiment of the present application proposes a stroller capable of being folded quickly, which comprises a seat structure 1 and a frame structure 2 which are connected with each other, wherein the frame structure 2 comprises a front frame 21, a rear frame 22 and an armrest frame 23 which are hinged with each other, and the frame structure 2 is further provided with a linkage folding joint 3, a locking connection mechanism 4 and a first folding control mechanism 5.

Referring to fig. 8 and 17 to 19, the linkage folding joint 3 is disposed at a joint of the front frame 21, the rear frame 22 and the armrest frame 23, and is used for driving the front frame 21 and the armrest frame 23 to rotate relatively at the same time; the linkage folding joint 3 comprises a front frame connecting piece 31 connected with the front frame 21, a rear frame connecting piece 32 connected with the rear frame 22 and a handrail frame connecting piece 33 connected with the handrail frame 23, wherein a long strip guide hole 321 with a hole length direction parallel to the rear frame 22 is arranged on the rear frame connecting piece 32, and the ends of the front frame connecting piece 31, the rear frame connecting piece 32 and the handrail frame connecting piece 33 are mutually hinged to form a coaxial hinge part 1a; the linkage folding joint 3 further comprises a first linkage rod 34 and a second linkage rod 35, one end of the first linkage rod 34 and one end of the second linkage rod 35 are hinged to form a direct-motion hinge part 2a, the direct-motion hinge part 2a is arranged in the long guide hole 321 and slides along the length direction of the hole of the long guide hole 321, the other end of the first linkage rod 34 is hinged to the armrest frame connecting piece 33 to form a first rotary hinge part 3a, the other end of the second linkage rod 35 is hinged to the front frame connecting piece 31 to form a second rotary hinge part 4a, the first rotary hinge part 3a and the second rotary hinge part 4a are respectively arranged on the circumferences of two opposite sides of the coaxial hinge part 1a, the first rotary hinge part 3a and the second rotary hinge part 4a are respectively eccentric with the coaxial hinge part 1a, and a first arc-shaped long hole 5a for limiting the rotary stroke of the first rotary hinge part 3a and a second arc-shaped hinge part 4a and a for limiting the rotary stroke of the second rotary hinge part 3a are arranged on the rear frame connecting piece 32, and the second arc-shaped hinge part 4a is arranged on the rear frame connecting piece 1a is in a coaxial, and the first rotary hinge part 1a is pulled along the circumference of the first rotary hinge part 2a, and the second rotary hinge part 1a is pulled by the first rotary hinge part and the second rotary hinge part 1a is coaxial. It should be noted that, in this embodiment, two armrest frame connectors 33 are provided and symmetrically disposed on two sides of the rear frame connector 32, and the two armrest frame connectors 33 are riveted to form a first rotation hinge portion 3a, and the first rotation hinge portion 3a passes through the first arc-shaped long hole 5a and moves in the first arc-shaped long hole 5 a. The linkage folding joint 3 enables the baby carrier to be fully folded and occupies smaller space after being folded, so that the baby carrier is convenient to carry and store, and in addition, the linkage structure is simpler and more convenient to use.

Referring to fig. 4 to 5, a locking connection 4 is provided between the front frame 21 and the rear frame 22 for locking the frame structure 2 in the deployed use state; the locking connection mechanism 4 comprises a locking connection piece 41, a sliding rod 42 which is parallel to the rear frame 22 and a locking block 43 which is slidably connected to the sliding rod 42, one end of the locking connection piece 41 is hinged to the front frame 21, the other end of the locking connection piece 41 is hinged to the locking block 43, a locking hole 431 is formed in the locking block 43, specifically, a sliding hole is formed in the locking block 43, and the locking block 43 is sleeved on the sliding rod 42 through the sliding hole to form sliding connection. When the locking piece 43 slides to the position shown in fig. 4, the locking connecting piece 41 and the rear frame 22 of the front frame 21 form a triangle supporting structure, so that the baby carrier can be stabilized in the unfolded state based on the stability of the triangle, the structure is simple, and the unfolded state of the baby carrier after being unfolded is more stable, reliable and safe.

In order to further lock the frame structure 2 in the unfolded use state in a reinforced manner, so that the unfolded use state of the baby carrier is further stable, reliable and safe to ensure the child safety to a greater extent, the linkage folding joint 3 is further provided with a forced locking structure, and the forced locking structure comprises: a lock shaft 61 provided on the armrest frame connection member 33 and circumferentially provided along the coaxial hinge portion 1a, the lock shaft 61 being circumferentially moved about the coaxial hinge portion 1a during the unfolding and folding of the frame structure 2; the rotary lock piece 62 is hinged on the rear frame connecting piece 32 and is circumferentially arranged along the coaxial hinge part 1a, the rotary lock piece 62 is provided with a lock hook 622 for locking the lock shaft 61, the rotary lock piece 62 is switched between a lock piece locking position and a lock piece unlocking position through rotation, when the rotary lock piece 62 rotates to the lock piece locking position, the lock hook 622 hooks the lock shaft 61 to lock the lock shaft 61, and the rotary lock piece 62 is provided with a torsion reset spring 624 for resetting at the hinge part of the rear frame connecting piece 32.

As shown in fig. 6 to 11, a first folding control mechanism 5 is provided on the rear frame 22 for locking or unlocking the lock link mechanism 4 to unfold or fold the frame structure 2; the first folding control mechanism 5 includes: a connecting rod 53 having both ends fixedly connected to the rear frame 22, the connecting rod 53 having a long sliding cavity 531, and a top stopper 532 fixed to the outer periphery of the connecting rod 53; the rotary rod 51 is coaxially rotatably sleeved outside the connecting rod 53 around the connecting rod 53, a rotary groove 522 sleeved in the top blocking part 532 when the rotary rod 51 rotates is formed in the periphery of the rotary rod 51, a rotary cavity 521 is formed in the rotary rod 51, a conical groove 5211 is formed in the rotary cavity 521, the groove width of the conical groove 5211 is reduced along the circumferential direction of the cavity wall, a rotary handle 52 for driving the rotary rod 51 to rotate is further arranged on the rotary rod 51, a first sliding key 523 capable of sliding along the axial direction of the rotary handle 52 and a blocking pin 524 connected with the first sliding key 523 and sliding along with the first sliding key 523 to extend into the rotary groove 522 are arranged on the rotary handle 51, a blocking pin reset spring is arranged between the first sliding key 523 and the rotary handle 52, and a handle reset spring for rotationally resetting the rotary handle 52 is arranged between the rotary handle 52 and the connecting rod 53; the pulling assembly 54 is disposed in the elongated sliding cavity 531, the pulling assembly 54 includes a first pulling block 541 and a second pulling block 542, the first pulling block 541 and the second pulling block 542 are disposed opposite to each other, a first compression spring 10 is disposed between the first pulling block 541 and the second pulling block 542, a first axial pushing inclined surface 5411 that is matched with the tapered groove 5211 is disposed on the first pulling block 541, a second axial pushing inclined surface 5412 that is matched with the tapered groove 5211 is disposed on the second pulling block 542, and the first axial pushing inclined surface 5411 and the second axial pushing inclined surface 5412 are respectively in contact with the groove wall of the tapered groove 5211; the lock core 55, be equipped with the lock way 511 in the rotary rod 51, the lock core 55 is established in the lock way 511, be equipped with in the lock way 511 will the outward ejecting second compression spring 20 of lock core 55, the lockhole 431 has been seted up on the locking piece 43, the frame structure 2 is expanded and is used the lock core 55 stretches into in the lockhole 431 in order to lock the locking piece 43. A first pull rope 40 for pulling the lock cylinder 55 out of the lock hole 431 to unlock the lock connection mechanism 4 is provided between the lock cylinder 55 and the first pull block 541. The first folding control mechanism is controlled by one key, so that the baby carrier can be conveniently and rapidly controlled to switch between the folding state and the unfolding state, in addition, the folding can be started after the first sliding key is slid and the rotating handle is rotated to unlock the locking connection mechanism before the baby carrier is folded, accidents can be effectively prevented from being caused under the condition that the control button is touched by mistake, the use safety of the baby carrier is greatly improved, on the other hand, the unlocking is more labor-saving through the rotation of the rotating handle, the baby carrier can be directly lifted to carry the baby carrier after the baby carrier is unlocked and folded, and the baby carrier is convenient and rapid.

The first folding control mechanism is provided with a forced locking release structure for unlocking the forced locking structure, and fig. 6 to 11 show the structure of the forced locking release structure on the first folding control mechanism, and the forced locking release structure unlocks the forced locking structure while rotating a rotary handle to unlock the locking connection mechanism. Specifically, the forced lock release structure includes: a movable hole 623 provided in the rotary lock plate 62, wherein a locking position 6231, a sliding position 6232 and an unlocking position 6233 are provided in the movable hole 623, and two sides of the sliding position 6232 are respectively engaged with the locking position 6231 and the unlocking position 6233; a movable shaft 71 provided in the movable hole 623 and switching between the lock position 6231 and the unlock position 6233 to rotate the rotation lock piece 62; the upper end of the first push-pull connecting piece 74 is connected to the movable shaft 71 to drive the movable shaft 71 to move in the movable hole 623, wherein the first push-pull connecting piece 74 and the movable shaft 71 are preferably connected in a welding manner, and can be hinged; the upper end of the second push-pull connecting piece 75 is hinged with the lower end of the first push-pull connecting piece 74, and a sliding protrusion 751 for driving the second push-pull connecting piece 75 to push and pull is arranged at the lower end of the second push-pull connecting piece 75; a connecting cover 76 sleeved on the rear frame 22 and fixedly connected with one end of the connecting rod 53, wherein a push-pull blind hole 761 is provided on the connecting cover 76, the second push-pull connecting piece 75 is slidably installed in the push-pull blind hole 761, a bar hole 7611 is provided on one side of the push-pull blind hole 761 facing the connecting rod 53, the sliding protrusion 751 extends from the bar hole 7611 to perform translational movement along the length direction of the bar hole 7611 so as to push and pull the second push-pull connecting piece 75, and a fifth compression spring 100 is provided between the bottom of the push-pull blind hole 761 and the second push-pull connecting piece 75; the rotating head 77 is arranged at the end part of the rotating rod 51, an arc-shaped surface 771 is arranged on the rotating head 77, the arc-shaped surface 771 comprises a far-axis position 7711 far away from the axis of the rotating rod 51 and a near-axis position 7712 close to the axis of the rotating rod 51, the sliding protrusion 751 is tightly attached to the inner side of the arc-shaped surface 771, and when the rotating head 77 rotates along with the rotating handle 52, the sliding protrusion 751 is switched between the far-axis position 7711 and the near-axis position 7712 to drive the sliding protrusion 751 to do translational motion along the length direction of the strip-shaped hole 7611. When the forced locking structure is unlocked, the rotary handle 52 is rotated first, the rotary handle 52 drives the rotary rod 51 to rotate around the connecting rod 53, the arc-shaped surface 771 on the rotary head 77 rotates along with the rotary rod, the sliding protrusion 751 is forced to slide from the far axis position 7711 to the near axis position 7712, meanwhile, the sliding protrusion 751 moves in the bar-shaped hole 7611 towards the radial direction close to the rotary shaft, the sliding protrusion 751 drives the second push-pull connecting piece 75 to move in the hole direction in the push-pull blind hole 761, the first push-pull connecting piece 74 pulls the movable shaft 71 to slide from the locking position 6231 to the unlocking position 6233 of the movable hole 623 along with the movement of the second push-pull connecting piece 75, and the rotary locking piece 62 is driven to rotate, so that the locking hook 622 is separated from the locking shaft 61, and unlocking of the forced locking structure is completed. Similarly, when the rotary handle 52 is turned reversely, the forced locking structure is locked again, and in order to strengthen the restoring force, the rotary locking plate 62 is provided with a torsion restoring spring 624 for restoring at the hinge position of the rear frame connecting member 32, and a fifth compression spring 100 is provided between the bottom of the push-pull blind hole 761 and the second push-pull connecting member 75. Through the forced locking and unlocking structure, the forced locking structure can be unlocked when the locking and connecting mechanism is unlocked only by easily rotating the rotary handle, and the forced locking and unlocking mechanism is simple in structure and convenient and labor-saving to operate.

Further, the seat structure 1 is provided with a plug 101, the frame structure 2 is provided with a slot part 201, the plug 101 is detachably inserted into the slot part 201 so that the seat structure 1 is detachably mounted on the frame structure 2, the seat structure 1 can be reversely inserted into the frame structure 2 in a vertically 180-degree rotation manner to realize different use requirements, the plug 101 is provided with an elastic clamp protrusion, the slot part 201 is internally provided with a buckle matched with the elastic clamp protrusion so that the plug 101 can be stably inserted into the slot part 201, and the plug 101 can be pulled out from the slot part 201 by pressing the elastic clamp protrusion to release the buckle;

the slot part 201 is coaxially hinged with the linkage folding joint 3, a clamping and rotating hole 202 is formed in the slot part 201, a sliding protrusion 751 at the lower end of the second push-pull connecting piece 75 drives the second push-pull connecting piece 75 to extend into the clamping and rotating hole 202 when in push-pull action so as to prevent the slot part 201 from rotating or withdraw from the clamping and rotating hole 202 to enable the slot part 201 to freely rotate, and the seat structure 1 can freely rotate relative to the frame structure 2 when the slot part 201 freely rotates. As can be seen from the above structure, the rotating handle drives the rotating head 77 to rotate, the rotating head 77 drives the sliding protrusion 751 to perform a translational motion, the sliding protrusion 751 drives the second push-pull connecting piece 75 to perform a push-pull action, the second push-pull connecting piece 75 extends into or withdraws from the rotation locking hole 202 to control the rotation of the slot portion 201, so as to control the rotation folding of the seat structure 1 relative to the frame structure 2.

Wherein, linkage folding joint 3, locking coupling mechanism 4 and first folding control mechanism 5 constitute the linkage unblock structure jointly.

Further, as shown in fig. 25 to 32, the rear frame 22 is provided with a first rear wheel 24, a second rear wheel 25, a main brake 26 for braking the first rear wheel 24, and an auxiliary brake 27 driven by the main brake 26 for braking the second rear wheel 25, and the first rear wheel 24 is provided with a main brake hole 241 along a circumference of the wheel axle; the main brake 26 comprises a wheel axle mounting seat 261 connected with the rear frame 22, a pedal block 28 capable of rotating around the wheel axle of the first rear wheel 24 is arranged on the wheel axle mounting seat 261, a brake slide block 281 is arranged on the pedal block 28, a normally-arranged concave position 2611 where the brake slide block 281 is normally arranged and a brake concave position 2612 which positions a brake state when braking are arranged on the periphery of the wheel axle mounting seat 261, and the brake slide block 281 slides between the normally-arranged concave position 2611 and the brake concave position 2612 along with the rotation of the pedal block 28; the bottoms of the normally-arranged concave position 2611 and the brake concave position 2612 are conical and are adjacently arranged; the brake slider 281 is provided with a slider return spring 300 for propping against the normally-placed concave position 2611 or the brake concave position 2612, a pedal return spring for enabling the pedal 28 to trend towards the normally-placed concave position 2611 is arranged between the pedal 28 and the wheel axle mounting seat 261, and the pedal 28 is also provided with a third stay cord 60 for pulling the auxiliary brake 27; the axle mounting seat 261 is provided with a brake pin assembly 263 which extends out of the axle mounting seat 261 and is clamped into the main brake hole 241 to realize braking, the brake pin assembly 263 comprises a brake pin shaft 2631 and a brake pin sleeve 2632, the brake pin shaft 2631 is sleeved in the brake pin sleeve 2632, a knock pin spring 2633 is arranged between the brake pin shaft 2631 and the brake pin sleeve 2632, the brake pin sleeve 2632 is provided with a travel hole 263a, and the brake pin shaft 2631 is provided with a travel shaft 263b which extends into the travel hole 263 a; the pedal block 28 is further provided with a rotary sliding groove 842 capable of controlling braking or non-braking of the brake pin assembly 263 when rotating, the rotary sliding groove 842 comprises a high position 8421, a low position 8422 and a sliding inclined surface 8423 connecting the high position 8421 and the low position 8422, and a jacking spring 2634 for enabling the brake pin sleeve 2632 to prop against the rotary sliding groove 842 is arranged between the wheel axle mounting seat 261 and the pedal block 28. The structure is simple, the linkage brake can be realized only by lightly stepping on the pedal, and the brake position is more accurate, reliable and stable due to the cooperation of the brake slide block 281, the normally-arranged concave position 2611 and the brake concave position 2612.

The braking process is explained as follows: the pedal block 28 is lightly stepped, the rotary sliding groove 842 rotates, the brake pin sleeve 2632 sliding to the high position 8421 along with the sliding inclined plane 8423 is ejected to the direction of the first rear wheel 24, the brake pin shaft 2631 is pressed by the extruded ejector pin spring 2633 to extend into the main brake hole 241 so as to clamp the first rear wheel 24 to realize braking, at the moment, the brake sliding block 281 slides to the brake concave position 2612 from the normal concave position 2611 along with the stepping of the pedal block 28 to stabilize a braking state, and in addition, when the rotary sliding groove 842 rotates, the rotary sliding groove 842 pulls the auxiliary brake 27 by pulling the third pull rope 60 to realize braking of the second rear wheel 25, so that the effect of one-step double braking is achieved. Similarly, the pedal block 28 is reset only when the brake is released, the top sleeve spring 2634 ejects the brake pin sleeve 2632 away from the first rear wheel 24 to enable the brake pin sleeve 2632 to prop against the low position 8422, and meanwhile, the travel hole 263a pulls the brake pin shaft 2631 away from the main brake hole 241 through the travel shaft 263b to release the brake.

Wherein, the auxiliary brake 27 comprises: a sub-axle mount 271 connected to the rear frame 22, the sub-axle mount 271 being provided with a rotating block 29 rotatable about an axle of the second rear wheel 25; a secondary brake hole arranged along the circumference of the wheel shaft of the second rear wheel 25; the auxiliary brake pin assembly 273 is arranged on the auxiliary wheel shaft mounting seat 271 and extends out of the auxiliary wheel shaft mounting seat 271 to be clamped into the auxiliary brake hole to realize braking, the auxiliary brake pin assembly 273 comprises an auxiliary brake pin shaft 2731 and an auxiliary brake pin sleeve 2732, the auxiliary brake pin shaft 2731 is sleeved into the auxiliary brake pin sleeve 2732, an auxiliary ejector pin spring 2733 is arranged between the auxiliary brake pin shaft 2731 and the auxiliary brake pin sleeve 2732, the auxiliary brake pin sleeve 2732 is provided with an auxiliary travel hole 273a, and an auxiliary travel shaft extending into the auxiliary travel hole 273a is arranged on the auxiliary brake pin shaft 2731; the rotating block 29 is further provided with a secondary rotating chute 942 capable of controlling braking or non-braking of the secondary braking pin assembly 273 when rotating, the secondary rotating chute 942 comprises a secondary high position 9421, a secondary low position 9422 and a secondary sliding inclined plane 9423 connecting the secondary high position 9421 and the secondary low position 9422, and a secondary top sleeve spring 2734 for enabling the secondary braking pin sleeve 2732 to abut against the secondary rotating chute 942 is arranged between the secondary wheel shaft mounting seat 271 and the rotating block 29; a rotary block return spring 400 is arranged between the rotary block 29 and the auxiliary axle mounting seat 271; the third pull cord 60 is connected to the rotation block 29 such that the third pull cord 60 pulls the rotation block 29 to rotate when the pedal block 28 is stepped on. The structure for braking makes the braking of the baby carrier more gentle and reliable.

When the rotary sliding groove 842 pulls the third pull rope 60 to pull the auxiliary brake 27 to brake the second rear wheel 25, the third pull rope 60 pulls the rotary block 29 to rotate, the auxiliary brake pin sleeve 2732 sliding along the auxiliary sliding inclined plane 9423 to the auxiliary high position 9421 is pushed out towards the second rear wheel 25, the auxiliary brake pin shaft 2731 is pushed into the auxiliary brake hole by the extruded auxiliary push pin spring 2733 to clamp the second rear wheel 25, and the rotary block 29 loses the pulling force of the third pull rope 60 when the braking state of the first rear wheel 24 is released, at the moment, the rotary block return spring 400 rotates and returns the rotary block 29, the auxiliary push pin sleeve 2734 pushes the auxiliary brake pin sleeve 2732 towards the direction far away from the second rear wheel 25 to push the auxiliary brake pin sleeve 2732 out of the auxiliary low position 9422, and meanwhile the auxiliary travel hole 273a pulls the auxiliary brake pin shaft 2731 away from the auxiliary brake hole by the auxiliary travel shaft to release the braking.

As shown in fig. 33 to 35, the armrest frame 23 includes an upper armrest support 231, a lower armrest support 232 coupled to the upper armrest support 231, and an armrest adjusting device fixed to the upper armrest support 231 to control the telescopic movement of the armrest; the handrail adjusting device comprises a fixed seat 234 installed on an upper handrail bracket 231, a limiting block 235 fixed in the fixed seat 234, a moving block 236 capable of moving in the limiting block 235 and an elastic button 237 capable of driving the moving block 236 to move, wherein a fourth pull rope 70 is arranged on the moving block 236, and the moving block 236 pulls the fourth pull rope 70 when moving in the limiting block 235; the handrail adjusting device further comprises a clamping base 238 fixed on the upper handrail support 231, a telescopic sliding block 239 sleeved in the clamping base 238 and moving along the telescopic direction of the handrail, and a clamping sliding block 230 sleeved in the clamping base 238 and moving along the telescopic direction of the handrail, wherein the telescopic sliding block 239 is connected with the fourth pull rope 70, a plurality of clamping holes distributed along the telescopic direction of the handrail are formed in the lower handrail support 232, the clamping sliding block 230 can be clamped into the clamping holes to enable the upper handrail support 231 and the lower handrail support 232 to be mutually locked, an oblique long hole 2301 is formed in the clamping sliding block 230, and the telescopic sliding block 239 slides in the oblique long hole 2301 to enable the telescopic sliding block 239 to move along the telescopic direction of the handrail in the clamping sliding block 230 when the telescopic sliding block 239 moves along the telescopic direction of the handrail. Simple structure can realize the flexible of handrail frame 23 by a key, convenient and fast, and the practicality is strong.

Fig. 1 shows an exploded perspective view of the frame structure 2 in the unfolded state of use, and the following describes the folding process of the frame structure 2: the first sliding key 523 on the first folding control mechanism 5 is slid firstly, the blocking pin 524 is retracted from the rotating groove 522 along with the first sliding key 523 to leave a rotating space of the top blocking part 532, then the rotating handle 52 is rotated, the conical groove 5211 in the rotating cavity 521 is rotated along with the rotating handle, the first pulling block 541 and the second pulling block 542 in the pulling assembly 54 are pushed to move relatively, the pulling action of the first pulling rope 40 is realized, the lock cylinder 55 is pulled out of the lock hole 431, the locking block 43 which is originally locked by the lock cylinder 55 is unlocked, namely, the locking of the front frame 21 and the rear frame 22 is released, then the armrest frame 23 is pulled, and the linkage folding joint 3 drives the front frame 21 and the armrest frame 23 to rotate towards the direction close to the rear frame 22 simultaneously, so that the folding of the frame structure 2 is realized. Similarly, the unfolding process of the frame structure 2 only needs to rotate the rotary handle 52 in the opposite direction, the first sliding key 523 slides and pulls the stop pin 524 to extend into the rotary groove 522 under the action of the stop pin return spring so as to prevent the rotary handle 52 from rotating, so that the safety accident caused by misoperation of the handle can be effectively prevented, the armrest frame 23 is pulled, and the linkage folding joint 3 drives the front frame 21 and the armrest frame 23 to rotate in the direction away from the rear frame 22 at the same time, so that the unfolding of the frame structure 2 is realized.

The seat structure 1 comprises an upper seat frame 11, a lower seat frame 12, a front seat frame 13, a seat frame folding joint 14 and a second folding control mechanism 15, wherein the upper seat frame 11, the lower seat frame 12 and the front seat frame 13 are mutually hinged through the seat frame folding joint 14 and mutually lock and position the upper seat frame 11, the lower seat frame 12 and the front seat frame 13 when the seat structure 1 is unfolded and used, and the second folding control mechanism 15 is connected with the seat frame folding joint 14 to control the seat frame folding joint 14 to be unlocked and folded.

As shown in fig. 12 to 16, the seat frame folding joint 14 includes: an upper seat frame connecting member 141 provided with a first hinge portion 1411 and a first connecting portion 1412 connected to the upper seat frame 11, wherein a first shaft hole 1411e, a first inclined protrusion 1411b provided along the outer periphery of the first shaft hole 1411e and a first tooth groove 1411c provided along the outer periphery of the first inclined protrusion 1411b are provided on the first hinge portion 1411, and a second tooth groove 1411d provided along the outer periphery of the first shaft hole 1411e is provided on an end surface of the first hinge portion 1411 opposite to the first tooth groove 1411c; a first rotating top protrusion 142, the circumference of which is provided with a first inclined pushing part 1421 matched with the first inclined pushing protrusion 1411b, and the inside of which is provided with a clamping hole 1422 for transmitting rotating power, wherein the first rotating top protrusion 142 is coaxially arranged in the first hinge part 1411 and is installed in a staggered manner with the first inclined pushing protrusion 1411b in the circumferential direction, and the first inclined pushing part 1421 climbs along the first inclined pushing protrusion 1411b when the first rotating top protrusion 142 rotates to enable the first rotating top protrusion 142 to be axially ejected; a first latch 143, which is embedded in the first tooth slot 1411c, wherein an end surface of the first latch is abutted against an end surface of the first rotary jacking body 142, and when the first rotary jacking body 142 is axially ejected, the first latch 143 is pushed to axially move so as to be separated from the first tooth slot 1411c; the seat car connecting member 144 is provided with a second hinging portion 1441 and a second connecting portion 1442 connected with the frame structure 2, a third tooth socket 1441a arranged circumferentially is arranged on the second hinging portion 1441, the first tooth 143 is clamped in the third tooth socket 1441a at an axial part, an axial gap for axially moving the first tooth 143 is arranged between the first tooth 143 and the third tooth socket 1441a, and a third compression spring for pushing the first tooth 143 to the first tooth socket 1411c is arranged between the first tooth 143 and the second hinging portion 1441; a second rotary top protrusion 145, which is provided with a rotary base 1451, a clamping shaft 1452 extending axially along the rotary base 1451, and a second inclined pushing portion 1453 disposed circumferentially along the rotary base 1451, wherein a second pulling portion 1454 is disposed on the second inclined pushing portion 1453, and the clamping shaft 1452 extends axially along the rotary base 1451 and passes through the first shaft hole 1411e to extend into the clamping hole 1422 of the first rotary top protrusion 142 so as to rotate the first rotary top protrusion 142 when the second rotary top protrusion 145 rotates; a second latch 146, which is provided with a rotating cavity 1461, wherein a second oblique pushing protrusion 1461a is circumferentially arranged at the bottom of the rotating cavity 1461, the second latch 146 is embedded in the second tooth socket 1411d, an axial gap for the second latch 146 to axially move is arranged between the second latch 146 and the second tooth socket 1411d, the rotating base 1451 is coaxially embedded in the rotating cavity 1461, the second oblique pushing part 1453 and the second oblique pushing protrusion 1461a are installed in a staggered manner in the circumferential direction, a travel gap 1454a along the rotation direction of the second oblique pushing part 1453 is arranged between the second oblique pushing part 1453 and the second oblique pushing protrusion 1461a, the second oblique pushing part 1453 firstly rotates through the travel gap 1454a and then climbs along the second oblique pushing protrusion 1411 a when the second rotary top protrusion 145 rotates, the second latch 146 moves axially and is separated from the second tooth socket 1411d, and a second return spring 200 is arranged between the second rotary top protrusion 145; a lower seat frame connecting member 147 provided with a third hinge portion 1471 and a third connecting portion 1472 connected to the lower seat frame 12, wherein a fourth tooth groove 1471a circumferentially arranged is provided on the third hinge portion 1471, and the second latch 146 is clamped in the fourth tooth groove 1471a at an axial portion; a front frame connecting member 148 provided with a fourth hinge section 1481 and a fourth connecting section 1482 connected to the front frame 13, the fourth hinge section 1481 being hinged to the third hinge section 1471. A fourth compression spring for pushing the second latch 146 against the second tooth space 1411d is provided between the second latch 146 and the third hinge portion 1471, and of course, the fourth compression spring may also be provided on the fourth hinge portion 1481, and the fourth compression spring pushes the second latch 146 against the second tooth space 1411d through the third hinge portion 1471. The folding joint of the chair frame can more conveniently realize the folding of the baby carrier, so that the baby carrier is more fully folded, the occupied space is saved, and the baby carrier is convenient to carry and store.

Further, a first circular arc hole 1411a with a center coinciding with the hinge center of the first hinge portion 1411 is formed in the first hinge portion 1411, a first starting end 1411aa and a first end 1411ab are formed in the first circular arc hole 1411a, a second circular arc hole 1471b with a center coinciding with the hinge center of the third hinge portion 1471 is formed in the third hinge portion 1471, a second starting end 1471ba and a second end 1471bb are formed in the second circular arc hole 1471b, the second end 1471bb overlaps with the first starting end 1411aa when the seat structure 1 is unfolded and used, a linkage portion 1481a is formed in an eccentric portion of the fourth hinge portion 1481, a pin penetrating through the first circular arc hole 1471 a and the second circular arc hole 1471b is fixed on the linkage portion 1471 a, the first hinge portion 1471 rotates to the second starting end 1471ba and the first starting end 1411 ba when the seat structure 1 is folded, and the second starting end 1411 ba and the second starting end 1411ab are continuously rotated, and the linkage portion 1471 a linkage portion 1481a is formed in an eccentric portion of the fourth hinge portion 1481, and the linkage portion 1471 a is formed in an eccentric portion of the fourth hinge portion 1471, and the linkage portion 1471 is continuously rotated to the first starting end 1411 b and the second hinge portion 11. The structure can realize linkage folding and linkage unfolding of the upper chair frame 11, the lower chair frame 12 and the front chair frame 13, and is ingenious in structure, so that the baby carrier is more convenient to use and smoother to fold.

As shown in fig. 20 to 24, the second folding control mechanism 15 includes: an outer set 151 fixed to the upper frame 11; an inner sleeve 152 sleeved in the outer sleeve 151, wherein a sliding groove 1521 and a second sliding key 1522 sliding in the sliding groove 1521 are provided on the inner sleeve 152, a rotation blocking part 1522a moving along with the sliding direction of the second sliding key 1522 is provided on the second sliding key 1522, and a rotation blocking return spring for resetting the rotation blocking part 1522a is provided between the second sliding key 1522 and the inner sleeve 152; the wrench 153 is hinged on the inner member 152, a clamping and rotating portion 1531 protruding from the circumferential surface of the wrench 153 is provided on the wrench 153, the clamping and rotating portion 1531 and the rotating portion 1522a intersect in the radial direction when the wrench 153 is rotated, the clamping and rotating portion 1531 is blocked by the rotating portion 1522a to rotate when the wrench 153 is rotated to a first angle, a wrench reset spring for resetting the wrench 153 is provided between the wrench 153 and the inner member 152, a second pull rope 50 for realizing pulling along with rotation of the wrench 153 is further provided on the wrench 153, and the second pull rope 50 is connected with the second pull portion 1454. The second folding control mechanism can realize the secondary stage unlocking of different distances of the stretching of different angle control of rotation through the stay cord, and the operator only needs to turn through light and can realize the automatic stage folding of bassinet for the folding of bassinet is more smooth and easy, stable, safety on convenient and fast's basis.

From fig. 1, a schematic view of the seat structure 1 in the unfolded use state can be seen, and the folding process of the seat structure 1 will be described below: the second sliding key 1522 on the second folding control mechanism 15 is slid first, the rotation blocking portion 1522a on the second sliding key 1522 slides along with the second sliding key, so that a space for the rotation of the rotation blocking portion 1531 is reserved, at this time, the rotation pulling member 153 is pulled upwards by the first angle a, preferably the first angle a is 30-60 degrees, then the second sliding key 1522 is released to enable the rotation blocking portion 1522a to block the rotation blocking portion 1531 for resetting, at this time, the second pulling rope 50 is pulled for a first distance, the rotation pulling member 153 is continuously pulled to a second angle b, preferably the second angle b is 90-150 degrees, and at this time, the second pulling rope 50 is pulled for a second distance. When the second stay cord 50 is pulled for a first distance, the second rotary jacking body 145 on the seat frame folding joint 14 is pulled to drive the first rotary jacking body 142 to rotate, and when the first rotary jacking body 142 rotates, the first clamping teeth 143 which are originally clamped on the upper seat frame connecting piece 141 and the seat car connecting piece 144 at the same time are jacked on the seat car connecting piece 144, so that the free rotation folding of the upper seat frame connecting piece 141 and the seat car connecting piece 144 is realized; it should be noted that, as shown in fig. 12, when the second pull rope 50 is pulled by the first distance, the second inclined pushing portion 1453 just completes the travel gap 1454a, so when the second pull rope 50 is pulled by the second distance, the first rotating top protrusion 142 continues to rotate, so as to push the second latch 146 that is originally clamped on the upper frame connecting member 141 and the lower frame connecting member 147 simultaneously to the lower frame connecting member 147, thereby realizing free rotation folding of the upper frame connecting member 141 and the lower frame connecting member 147; it should be noted that, when the seat structure 1 is unfolded and used, the second end 1471bb overlaps the first end 1411aa, the linkage pin is blocked to lock the front seat frame connecting member 148, when the seat structure 1 is folded, the third hinge portion 1471 rotates to a state that the second end 1471ba overlaps the first end 1411aa, and when the third hinge portion 1471 is continuously rotated, the second end 1471ba drives the linkage pin to rotate to a state that the second end 1471ba overlaps the first end 1411ab, that is, the lower seat frame connecting member 147 and the front seat frame connecting member 148 are folded to overlap first, and then the lower seat frame connecting member 147 drives the front seat frame connecting member 148 to be folded to overlap with the upper seat frame connecting member 141, thereby realizing the rotational folding among the upper seat frame 11, the lower seat frame 12 and the front seat frame 13. Similarly, the second folding control mechanism is only operated in a direction required for unfolding the seat structure, and the second rotary top protrusion return spring 200 guides the second rotary top protrusion 145 to rotate reversely, so that the upper seat frame 11, the lower seat frame 12 and the front seat frame 13 can be gradually unfolded, which is not described herein.

The locking connection mechanisms 4 are symmetrically arranged at two sides of the baby carrier and are simultaneously controlled by the first folding control mechanism 5 through symmetrically arranged pull ropes; the chair frame folding joints 14 are symmetrically arranged at two sides of the baby carrier and are simultaneously controlled by a second folding control mechanism 15 through pull ropes which are symmetrically arranged; the forced locking structure and the forced locking releasing structure are symmetrically arranged at two sides of the baby carrier and are driven to act simultaneously by rotating the handle; the linkage folding joints 3 are symmetrically arranged on two sides of the baby carrier, so that redundant description is omitted. Further, the first pull rope, the second pull rope, and the third pull rope described in the present embodiment may be a dinir rope and a wire rope, and in the present embodiment, a wire rope is preferable.

In summary, the present application has the following beneficial effects through structural improvement:

1. the linkage folding joint enables the baby carrier to be fully folded, occupies smaller space after being folded, is convenient to carry and store, and in addition, the linkage structure is more convenient and quick to use;

2. the locking connecting mechanism is based on triangle stability, so that the baby carrier can be stabilized in a unfolded state, the structure is simple, and the unfolded state of the baby carrier after being unfolded is more stable, reliable and safe.

3. The forced locking structure can further lock the frame structure in the unfolded use state in a reinforced way, so that the unfolded use state of the baby carrier is further stable, reliable and safe to ensure the safety of children to a greater extent; the forced locking and unlocking structure is matched, and the forced locking structure can be unlocked when the locking and connecting mechanism is unlocked only by easily rotating the rotating handle, so that the structure is simple, and the operation is convenient and labor-saving.

4. The first folding control mechanism is controlled by one key, so that the baby carrier can be conveniently and rapidly controlled to switch between the folding state and the unfolding state, in addition, the folding can be started after the first sliding key is slid and the rotating handle is rotated to unlock the locking connection mechanism before the baby carrier is folded, accidents can be effectively prevented from being caused under the condition that the control button is touched by mistake, the use safety of the baby carrier is greatly improved, on the other hand, the unlocking is more labor-saving through the rotation of the rotating handle, the baby carrier can be directly lifted to carry the baby carrier after the baby carrier is unlocked and folded, and the baby carrier is convenient and rapid.

5. The pedal type brake has a simple structure, the linkage brake can be realized only by lightly stepping on the pedal block, and the brake position is more accurate, reliable and stable due to the cooperation of the brake slide block, the normally-arranged concave position and the brake concave position.

6. The folding joint of the chair frame can conveniently realize the folding of the baby carrier, so that the folding of the baby carrier is more sufficient, the occupied space is saved, the baby carrier is convenient to carry and store, in addition, the folding and the unfolding of the linkage of the upper chair frame, the lower chair frame and the front chair frame can be realized, the structure is ingenious, the use of the baby carrier is more convenient, and the folding is smoother.

7. The second folding control mechanism can realize the secondary stage unlocking of different distances of the stretching of different angle control of rotation through the stay cord, and the operator only needs to turn through light and can realize the automatic stage folding of bassinet for the folding of bassinet is more smooth and easy, stable, safety on convenient and fast's basis.

The foregoing description of one or more embodiments provided in connection with the specific disclosure is not intended to limit the practice of this application to such description. Any approximation, or substitution of techniques for the methods, structures, etc. of the present application or for the purposes of making a number of technological deductions based on the concepts of the present application should be considered as the scope of protection of the present application.

Claims (8)

1. Quick foldable buggy, including interconnect's seat structure (1) and frame structure (2), frame structure (2) are including articulated preceding frame (21), back frame (22) and handrail frame (23) each other, its characterized in that, frame structure (2) still include:

The linkage folding joint (3) is arranged at the joint of the front frame (21), the rear frame (22) and the armrest frame (23) and is used for driving the front frame (21) and the armrest frame (23) to rotate relatively at the same time;

a locking connection mechanism (4) provided between the front frame (21) and the rear frame (22) for locking the frame structure (2) in a deployed use state;

a first folding control mechanism (5) provided on the rear frame (22) for locking or unlocking the lock connection mechanism (4) to expand or fold the frame structure (2);

the seat structure (1) comprises an upper seat frame (11), a lower seat frame (12), a front seat frame (13), a seat frame folding joint (14) and a second folding control mechanism (15), wherein the upper seat frame (11), the lower seat frame (12) and the front seat frame (13) are mutually hinged through the seat frame folding joint (14) and mutually lock and position the upper seat frame (11), the lower seat frame (12) and the front seat frame (13) when the seat structure (1) is unfolded and used, and the second folding control mechanism (15) is connected with the seat frame folding joint (14) to control the seat frame folding joint (14) to be unlocked and folded;

the linkage folding joint (3) comprises a front frame connecting piece (31) connected with the front frame (21), a rear frame connecting piece (32) connected with the rear frame (22) and a handrail frame connecting piece (33) connected with the handrail frame (23), wherein the rear frame connecting piece (32) is provided with a long strip guide hole (321) with a hole length direction parallel to the rear frame (22), and the ends of the front frame connecting piece (31), the rear frame connecting piece (32) and the handrail frame connecting piece (33) are mutually hinged to form a coaxial hinge part (1 a);

The linkage folding joint (3) further comprises a first linkage rod (34) and a second linkage rod (35), one end of the first linkage rod (34) and one end of the second linkage rod (35) are hinged to form a straight-movement hinge part (2 a), the straight-movement hinge part (2 a) is arranged in the long guide hole (321) and slides along the length direction of the hole of the long guide hole (321), the other end of the first linkage rod (34) is hinged to the armrest frame connecting piece (31) to form a first rotation hinge part (3 a), the other end of the second linkage rod (35) is hinged to the front frame connecting piece (31) to form a second rotation hinge part (4 a), the first rotation hinge part (3 a) and the second rotation hinge part (4 a) are respectively arranged on the circumferences of two sides of the coaxial hinge part (1 a), the first rotation hinge part (3 a) and the second rotation hinge part (4 a) are respectively hinged to the coaxial hinge part (1 a), the second rotation hinge part (3 a) is provided with a first arc-shaped hinge part (2 a) for limiting the rotation of the first arc-shaped hinge part (4 a), the first rotary hinge part (3 a) pushes the straight hinge part (2 a) to slide along the length direction of the hole of the long guide hole (321) when rotating around the coaxial hinge part (1 a), so that the second rotary hinge part (4 a) is pulled by the straight hinge part (2 a) to rotate around the coaxial hinge part (1 a), and the linkage folding action of the frame structure (2) is completed;

The chair frame folding joint (14) comprises:

an upper seat frame connecting member (141) provided with a first hinge part (1411) and a first connecting part (1412) connected with the upper seat frame (11), wherein a first shaft hole (1411 e), a first oblique pushing protrusion (1411 b) arranged on the end surface of the first hinge part (1411) and along the periphery of the first shaft hole (1411 e) and a first tooth groove (1411 c) arranged along the periphery of the first oblique pushing protrusion (1411 b) are arranged on the first hinge part (1411), and a second tooth groove (1411 d) arranged along the periphery of the first shaft hole (1411 e) is arranged on the end surface of the first hinge part (1411) opposite to the first tooth groove (1411 c);

the first rotary jacking body (142) is provided with a first inclined pushing part (1421) matched with the first inclined pushing protrusion (1411 b) at the periphery, a clamping hole (1422) for transmitting rotary power is formed in the first inclined pushing part, the first rotary jacking body (142) is coaxially arranged in the first hinging part (1411) and is installed in a staggered manner with the first inclined pushing protrusion (1411 b) in the circumferential direction, and when the first rotary jacking body (142) rotates, the first inclined pushing part (1421) climbs along the first inclined pushing protrusion (1411 b) to enable the first rotary jacking body (142) to be axially ejected;

a first latch (143) which is embedded in the first tooth slot (1411 c), wherein one end surface of the first latch is propped against one end surface of the first rotary jacking body (142), and the first rotary jacking body (142) pushes the first latch (143) to move axially and separate from the first tooth slot (1411 c) when being axially ejected;

The chair vehicle connecting piece (144) is provided with a second hinging part (1441) and a second connecting part (1442) connected with the frame structure (2), a third tooth socket (1441 a) which is circumferentially arranged is arranged on the second hinging part (1441), the first clamping tooth (143) is clamped in the third tooth socket (1441 a) at an axial part, an axial gap for the first clamping tooth (143) to axially move is arranged between the first clamping tooth (143) and the third tooth socket (1441 a), and a third compression spring for pushing the first clamping tooth (143) to the first tooth socket (1411 c) is arranged between the first clamping tooth (143) and the second hinging part (1441);

a second rotary top protrusion (145) provided with a rotary base (1451), a clamping shaft (1452) extending along the axial direction of the rotary base (1451), and a second inclined pushing part (1453) arranged along the circumferential direction of the rotary base (1451), wherein a second pulling part (1454) is arranged on the second inclined pushing part (1453), and the clamping shaft (1452) extends along the axial direction of the rotary base (1451) and passes through the first shaft hole (1411 e) to extend into a clamping hole (1422) of the first rotary top protrusion (142) so as to drive the first rotary top protrusion (142) to rotate when the second rotary top protrusion (145) rotates;

A second latch (146) provided with a rotating cavity (1461), wherein a second oblique pushing protrusion (1461 a) is circumferentially arranged at the bottom of the rotating cavity (1461), the second latch (146) is embedded in the second tooth socket (1411 d), an axial gap for the second latch (146) to axially move is arranged between the second latch (146) and the second tooth socket (1411 d), the rotating base (1451) is coaxially embedded in the rotating cavity (1461), the second oblique pushing part (1453) and the second oblique pushing protrusion (1461 a) are installed in a staggered manner in the circumferential direction, a stroke gap (1454 a) along the rotating direction of the second oblique pushing part (1453) is arranged between the second oblique pushing protrusion (1461 a), and when the second rotating top protrusion (145) rotates, the second oblique pushing part (1453) rotates through the stroke gap (1454 a) first and then moves away from the second tooth socket (145) along the second oblique pushing protrusion (1461 a), so that the second push protrusion (145) moves towards the second tooth socket (146) and the second oblique pushing protrusion (1461 a) is arranged between the second rotating top protrusion (145);

a lower chair frame connecting piece (147) provided with a third hinging part (1471) and a third connecting part (1472) connected with the lower chair frame (12), wherein a fourth tooth groove (1471 a) arranged circumferentially is arranged on the third hinging part (1471), the second clamping tooth (146) is clamped in the fourth tooth groove (1471 a) at an axial part, and a fourth compression spring used for pushing the second clamping tooth (146) to the second tooth groove (1411 d) is arranged between the second clamping tooth (146) and the third hinging part (1471);

A front frame connection (148) provided with a fourth hinge section (1481) and a fourth connection section (1482) to the front frame (13), the fourth hinge section (1481) being hinged to the third hinge section (1471).

2. The quick-folding buggy according to claim 1, characterized in that the locking connection mechanism (4) comprises a locking connection piece (41), a sliding rod (42) arranged in parallel with the rear frame (22) and a locking block (43) connected to the sliding rod (42) in a sliding manner, wherein one end of the locking connection piece (41) is hinged to the front frame (21), the other end is hinged to the locking block (43), and a locking hole (431) is formed in the locking block (43).

3. A quick-folding buggy according to claim 2, characterized in that the first folding control mechanism (5) comprises:

the two ends of the connecting rod (53) are fixedly connected to the rear frame (22), the connecting rod (53) is provided with a long sliding cavity (531), and a top baffle part (532) is also fixed on the periphery of the connecting rod (53);

the rotary rod (51) is coaxially and rotatably sleeved outside the connecting rod (53), a rotary groove (522) sleeved in the top blocking part (532) when the rotary rod (51) rotates is formed in the periphery of the rotary rod (51), a rotary cavity (521) is formed in the rotary rod (51), a conical groove (5211) is formed in the rotary cavity (521), the groove width of the conical groove (5211) is reduced along the circumferential direction of the cavity wall, a rotary handle (52) for driving the rotary rod (51) to rotate is further arranged on the rotary rod (51), a first sliding key (523) capable of axially sliding along the rotary handle (52) and a blocking pin (524) connected with the first sliding key (523) and sliding along with the first sliding key (523) to extend into the rotary groove (522) are arranged on the rotary rod (51), a blocking pin reset spring is arranged between the first sliding key (523) and the rotary handle (52), and the rotary handle (52) is provided with a reset spring (52) for resetting the rotary handle (52);

The traction assembly (54) is arranged in the long-strip sliding cavity (531), the traction assembly (54) comprises a first traction block (541) and a second traction block (542), the first traction block (541) and the second traction block (542) are arranged in a back-to-back mode, a first compression spring (10) is arranged between the first traction block (541) and the second traction block (542), a first axial pushing inclined surface (5411) matched with the conical groove (5211) is arranged on the first traction block (541), a second axial pushing inclined surface (5412) matched with the conical groove (5211) is arranged on the second traction block (542), and the first axial pushing inclined surface (5411) and the second axial pushing inclined surface (5412) are respectively contacted with the groove wall of the conical groove (5211);

lock core (55), be equipped with in rotary rod (51) and say (511), lock core (55) are established in saying (511), be equipped with in saying (511) with the outside ejecting second compression spring (20) of lock core (55), offer lockhole (431) on locking piece (43), frame structure (2) are expanded when using lock core (55) stretch into in lockhole (431) in order to lock locking piece (43), be equipped with between lock core (55) with first tractive piece (541) be used for with lock core (55) follow pull out in lockhole (431) in order to unblock first stay cord (40) of locking coupling mechanism (4).

4. The quick-folding stroller of claim 1, wherein the first hinge portion (1411) is provided with a first circular arc hole (1411 a) with a center coinciding with a hinge center of the first hinge portion (1411), the first circular arc hole (1411 a) is provided with a first starting end (1411 aa) and a first end (1411 ab), the third hinge portion (1471) is provided with a second circular arc hole (1471 b) with a center coinciding with a hinge center of the third hinge portion (1471), the second circular arc hole (1471 b) is provided with a second starting end (1471 ba) and a second end (1471 bb), the second end (1471 bb) overlaps with the first starting end (1411) when the seat structure (1) is unfolded, a linkage portion (1481 a) is provided at an eccentric portion of the fourth hinge portion (1481), a linkage portion (1481 a) is fixed to the second hinge portion (1471 a) which extends through the first starting end (1471 ba) and the second starting end (1471 ba) to the second starting end (1471 ba) when the seat structure (1) is unfolded and the first end (1471 b) is rotated, thereby continuously, and the linkage portion (1471 bb) is rotated to the second end (1471 b) when the seat structure (1471) is folded to the first end (1471) and the second end (1471 b) is folded over the first end (1) The lower chair frame (12) and the front chair frame (13) are folded by rotation.

5. A quick-folding buggy according to claim 1, characterized in that the second folding control mechanism (15) comprises:

an outer sleeve (151) fixed to the upper seat frame (11);

the inner sleeve (152) is sleeved in the outer sleeve (151), a sliding groove (1521) and a second sliding key (1522) sliding in the sliding groove (1521) are arranged on the inner sleeve (152), a rotation blocking part (1522 a) moving along with the sliding direction of the second sliding key (1522) is arranged on the second sliding key (1522), and a rotation blocking reset spring for resetting the rotation blocking part (1522 a) is arranged between the second sliding key (1522) and the inner sleeve (152);

the wrench comprises a wrench piece (153), wherein the wrench piece (153) is hinged on an inner sleeve piece (152), a clamping and rotating part (1531) protruding out of the circumferential surface of the wrench piece (153) is arranged on the wrench piece (153), the clamping and rotating part (1531) is radially intersected with a rotating blocking part (1522 a) when the wrench piece (153) is twisted to a first angle, the rotating blocking part (1522 a) blocks the clamping and rotating part (1531) to rotate, a wrench reset spring for resetting the wrench piece (153) is arranged between the wrench piece (153) and the inner sleeve piece (152), a second pull rope (50) which is used for realizing pulling along with the rotation of the wrench piece (153) is further arranged on the wrench piece (153), and the second pull rope (50) is connected with the second pulling part (1454).

6. A quick-folding buggy according to any one of claims 1-5, characterized in that the rear frame (22) is provided with a first rear wheel (24), a second rear wheel (25), a primary brake (26) for braking the first rear wheel (24) and a secondary brake (27) driven by the primary brake (26) for braking the second rear wheel (25), the first rear wheel (24) being provided with a primary brake hole (241) along the circumference of the wheel axle;

the main brake (26) comprises a wheel axle mounting seat (261) connected with the rear frame (22), a pedal block (28) capable of rotating around the wheel axle of the first rear wheel (24) is arranged on the wheel axle mounting seat (261), a brake slide block (281) is arranged on the pedal block (28), a normally-arranged concave position (2611) where the brake slide block (281) is normally arranged and a brake concave position (2612) for positioning a brake state during braking are arranged on the periphery of the wheel axle mounting seat (261), the brake slide block (281) slides between the normally-arranged concave position (2611) and the brake concave position (2612) along with the rotation of the pedal block (28), a slide block reset spring for enabling the brake slide block (281) to prop against the normally-arranged concave position (2611) or the brake concave position (2) is arranged on the periphery of the wheel axle mounting seat (261), and a third brake pull rope (60) is arranged on the pedal block reset spring (28);

The brake pin assembly (263) which stretches out of the wheel axle mounting seat (261) and is clamped into the main brake hole (241) to realize braking is arranged on the wheel axle mounting seat (261), the brake pin assembly (263) comprises a brake pin shaft (2631) and a brake pin sleeve (2632), the brake pin shaft (2631) is sleeved into the brake pin sleeve (2632), a top pin spring (2633) is arranged between the brake pin shaft (2631) and the brake pin sleeve (2632), the brake pin sleeve (2632) is provided with a travel hole (263 a), and a travel shaft which stretches into the travel hole (263 a) is arranged on the brake pin shaft (2631);

the pedal block (28) is further provided with a rotary sliding groove (842) capable of controlling the brake of the brake pin assembly (263) or not during rotation, the rotary sliding groove (842) comprises a high position (8421), a low position (8422) and a sliding inclined surface (8423) connected with the high position (8421) and the low position (8422), and a jacking spring (2634) for enabling the brake pin sleeve (2632) to prop against the rotary sliding groove (842) is arranged between the wheel axle mounting seat (261) and the pedal block (28).

7. A quick-folding stroller according to claim 1, characterized in that the armrest frame (23) comprises an upper armrest support (231), a lower armrest support (232) that is in socket connection with the upper armrest support (231), and an armrest adjustment device that is fixed to the upper armrest support (231) and controls the telescopic movement of the armrest;

The handrail adjusting device comprises a fixed seat (234) arranged on an upper handrail bracket (231), a limiting block (235) fixed in the fixed seat (234), a moving block (236) capable of moving in the limiting block (235) and an elastic button (237) capable of driving the moving block (236) to move, a fourth pull rope (70) is arranged on the moving block (236), and the fourth pull rope (70) is pulled by the moving block (236) when the limiting block (235) moves;

the handrail adjusting device further comprises a clamping base (238) fixed on the upper handrail support (231), a telescopic slide block (239) sleeved in the clamping base (238) and moving along the telescopic direction of the handrail, and a clamping slide block (230) sleeved in the clamping base (238) and moving along the telescopic direction of the handrail, wherein the telescopic slide block (239) is connected with the fourth pull rope (70), a plurality of clamping holes distributed along the telescopic direction of the handrail are formed in the lower handrail support (232), the clamping slide block (230) can be clamped into the clamping holes so that the upper handrail support (231) and the lower handrail support (232) are mutually locked, an oblique long hole (2301) is formed in the clamping slide block (230), and the telescopic slide block (239) slides in the oblique long hole (2301) so that the telescopic slide block (239) moves along the telescopic direction of the handrail and then moves along the telescopic direction of the clamping slide block (230) along the direction of the handrail.

8. A quick folding buggy according to claim 3, characterized in that the seat structure (1) is provided with a plug (101), the frame structure (2) is provided with a slot part (201), the plug (101) is detachably inserted into the slot part (201) so that the seat structure (1) is detachably mounted on the frame structure (2), the slot part (201) is coaxially hinged with the linkage folding joint (3), the slot part (201) is provided with a clamping rotation hole (202), and the first folding control mechanism (5) is further provided with:

the lower end of the second push-pull connecting piece (75) is provided with a sliding protrusion (751) for driving the second push-pull connecting piece (75) to push and pull, and the second push-pull connecting piece (75) stretches into the clamping rotating hole (202) to stop the slot part (201) from rotating when being pushed out;

the connecting cover (76) is sleeved on the rear frame (22) and fixedly connected with one end of the connecting rod (53), a push-pull blind hole (761) is formed in the connecting cover (76), the second push-pull connecting piece (75) is slidably arranged in the push-pull blind hole (761), a strip-shaped hole (7611) is formed in one side of the push-pull blind hole (761) facing the connecting rod (53), a sliding protrusion (751) extends out of the strip-shaped hole (7611) to perform translational movement along the length direction of the strip-shaped hole (7611) so as to push-pull the second push-pull connecting piece (75), and a fifth compression spring (100) is arranged between the bottom of the push-pull blind hole (761) and the second push-pull connecting piece (75);

The rotating head (77) is arranged at the end part of the rotating rod (51), an arc-shaped surface (771) is arranged on the rotating head (77), the arc-shaped surface (771) comprises a far axis position (7711) far away from the axis of the rotating rod (51) and a near axis position (7712) close to the axis of the rotating rod (51), the sliding protrusion (751) is tightly attached to the inner side of the arc-shaped surface (771), when the rotating head (77) rotates along with the rotating handle (52), the sliding protrusion (751) is switched between the far axis position (7711) and the near axis position (7712) to drive the sliding protrusion (751) to do translational motion along the length direction of the strip-shaped hole (7611), and the sliding protrusion (751) drives the second push-pull connecting piece (75) to achieve push-pull motion during translational motion.

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