Foldable baby carriage

Abstract

The utility model discloses a foldable baby carriage which comprises a bottom frame mechanism and a folding mechanism. The foldable or unfoldable support mechanism comprises a front supporting leg assembly, a rear supporting leg assembly and a handle assembly, the middle of the front supporting leg assembly is hinged to the middle of the rear supporting leg assembly, the lower end of the front supporting leg assembly is rotatably connected with the rear end of the bottom frame mechanism, and the lower end of the rear supporting leg assembly is slidably connected with the bottom frame mechanism. The lower end of the handle assembly is rotationally connected with the upper end of the rear supporting leg assembly. The front end and the rear end of the armrest mechanism are rotationally connected with the upper end of the front supporting leg assembly and the lower end of the handle assembly respectively. According to the baby carriage, one-key automatic folding can be achieved, folding operation is simple, the folded baby carriage is small in size and neat, the baby carriage can stand in two directions, stable and reliable supporting can be formed after the baby carriage is unfolded, and use firmness of the baby carriage is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of baby carriages, in particular to a foldable baby carriage. Background Art

[0002] The simple baby strollers that are popular on the market are lightweight, but they are complicated to fold and difficult for consumers to operate. The seats are not reclining and are made of cloth and ropes. They are easily deformed when children sit on them, sacrificing some of the baby's comfort. Summary of the invention

[0003] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a foldable baby stroller, which is easy to fold and fold. When folded, the baby stroller has a small and neat volume and can stand in two directions. When unfolded, the baby stroller can form a stable and reliable support, thereby effectively ensuring the reliability of the baby stroller.

[0004] According to the above-mentioned baby stroller, it is achieved through the following technical solutions:

[0005] A foldable baby stroller comprises: a chassis mechanism; a foldable or unfoldable support mechanism, comprising a front support leg assembly, a rear support leg assembly and a handle assembly, wherein the middle portion of the front support leg assembly is hinged to the middle portion of the rear support leg assembly, the lower end of the front support leg assembly is rotatably connected to the rear end of the chassis mechanism, the lower end of the rear support leg assembly is slidably connected to the chassis mechanism, and the lower end of the handle assembly is rotatably connected to the upper end of the rear support leg assembly; and an armrest mechanism, wherein the front and rear ends are rotatably connected to the upper end of the front support leg assembly and the lower end of the handle assembly, respectively. Furthermore, the armrest mechanism itself can also be switched between a folded state and an unfolded state, and the folding of the support mechanism can be linked to the folding of the armrest mechanism, thereby achieving the purpose of folding the stroller with one key.

[0006] In some embodiments, the handle assembly is arranged in a straight line with the rear support leg assembly in the unfolded state, so that the armrest mechanism, the upper end of the front support leg assembly, the upper end of the rear support leg assembly and the lower end of the handle assembly together form an upper triangle; the handle assembly is set at an angle with the rear support leg assembly in the folded state, so that the armrest mechanism, the upper end of the front support leg assembly, the upper end of the rear support leg assembly and the lower end of the handle assembly together form an upper quadrilateral or a four-bar linkage structure.

[0007] In some embodiments, the armrest mechanism includes two side tie rod assemblies and an armrest assembly, the opposite ends of the two side tie rod assemblies are rotatably connected to the upper end of the front support leg assembly and the lower end of the handle assembly, the opposite ends of the armrest assembly are hinged to the middle of the two side tie rod assemblies, and the armrest assembly can be switched between a flat state (i.e., a folded state) and a raised state (i.e., an unfolded state). Furthermore, when the bracket mechanism is folded, the armrest assembly can be linked to the armrest assembly so that the armrest assembly automatically switches from the raised state to the flat state.

[0008] In some embodiments, the armrest assembly and the side pull rod assembly are locked or unlocked by an armrest locking assembly. When the side pull rod assembly rotates relative to the front support leg assembly, it can be linked with the armrest locking assembly, so that when the bracket mechanism is folded, the armrest locking assembly can be linked to automatically unlock, so that the armrest assembly can rotate relative to the side pull rod assembly to automatically switch from a raised state to a flat state, thereby realizing one-click folding of the vehicle.

[0009] In some embodiments, the armrest locking assembly includes an unlocking slider and an elastic member, a first cam is provided at the front end of the side pull rod assembly, a slot is provided at a position of the armrest assembly corresponding to the side pull rod assembly, an elastic member and an unlocking slider that can slide along the length direction of the side pull rod assembly are provided in the side pull rod assembly, one end of the unlocking slider is wedge-shapedly matched with the first cam, and the other end can be switched between being inserted into the slot and moving away from the slot, and the elastic member has a tendency to keep the unlocking slider always engaged with the slot.

[0010] In some embodiments, the base frame mechanism includes a slide rail assembly and a sliding block, one end of the sliding block is rotatably connected to the lower end of the rear support leg assembly, and the other end of the sliding block can be slidably mounted outside the slide rail assembly, or the other end of the sliding block is slidably connected to a slide groove on the slide rail assembly.

[0011] In some embodiments, a front wheel assembly and a rear wheel assembly are respectively provided at the front and rear ends of the slide rail assembly, and the rear wheel assembly includes a rear connecting rod group, a rear wheel brake group and two rear wheels. The opposite ends of the rear wheel brake group are connected to the rear end of the slide rail assembly through the rear connecting rod group, and the two rear wheels are respectively connected to the left and right ends of the rear wheel brake group.

[0012] In some embodiments, a seat mechanism is further included, the seat mechanism is connected to the upper end of the front support leg assembly and the two side pull rod assemblies of the armrest mechanism respectively, the seat mechanism can be switched between a sitting state and a lying state, and the support mechanism can be linked to the seat mechanism for folding when folding. In some embodiments, the seat mechanism includes a seat plate assembly, a backrest assembly and a gear adjustment assembly, the front and rear ends of the seat plate assembly are respectively rotatably connected to the upper end of the front support leg assembly and the lower end of the backrest assembly, and the gear adjustment assembly is arranged between the backrest assembly and the seat plate assembly, and is used to make the backrest assembly reliably hover at a specific angle.

[0013] In some embodiments, the backrest assembly includes an upper back plate and a lower back plate, and the upper and lower ends of the lower back plate are rotatably connected to the upper back plate and the rear end of the seat plate assembly respectively.

[0014] In some embodiments, the seat mechanism also includes a seat cloth assembly and / or a flexible connector, the seat cloth assembly is respectively fixed to the seat plate assembly and the two side tie rod assemblies of the armrest mechanism, and the left and right outer sides of the rear end of the seat plate assembly are respectively connected to the two side tie rod assemblies through the flexible connector.

[0015] In some embodiments, a backrest locking assembly is provided between the seat plate assembly and the backrest assembly, an unlocking traction member is provided at the bottom of the seat plate assembly, a backrest unlocking turntable is provided at the front end of the side pull rod assembly of the armrest mechanism, and the backrest unlocking turntable is connected to the backrest locking assembly through the unlocking traction member.

[0016] In some embodiments, the seat plate assembly is provided with a mounting cavity opening forward, a foot pedal is provided in the mounting cavity, and the foot pedal can move between extending out of the mounting cavity and retracting into the mounting cavity.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] 1. The baby stroller of the utility model connects a foldable or unfoldable support mechanism between the bottom frame mechanism and the armrest mechanism, so that the baby stroller can be folded or unfolded, and the folding operation is simple. After folding, the volume is small and neat, and the baby stroller can stand in two directions. After unfolding, the support mechanism, the bottom frame mechanism and the armrest mechanism jointly enclose a double-triangle stable support structure, thereby forming a stable and reliable support, effectively ensuring the reliability of the baby stroller;

[0019] 2. The two opposite ends of the two side tie rod assemblies are respectively rotatably connected between the upper end of the front support leg assembly and the lower end of the handle assembly, and an armrest assembly hinged to the middle of the two side tie rod assemblies is arranged above the two side tie rod assemblies, so that the armrest assembly can be rotated relative to the two side tie rod assemblies, so that the armrest assembly can be switched between a raised state and a flat state. In addition, the armrest assembly in the armrest mechanism is linked by the bracket mechanism, so that when the baby stroller is folded, the armrest assembly can be linked and folded, thereby achieving the purpose of folding the stroller with one button;

[0020] 3. The seat mechanism is connected to the upper end of the front support leg assembly and the two side pull rod assemblies of the armrest mechanism respectively, and the seat mechanism can be switched between a sitting state and a lying state, so that the baby stroller can be used for sitting or lying, ensuring that newborn babies can also use it;

[0021] 4. The seat mechanism is linked to the bracket mechanism. When the scooter is folded, the seat mechanism will automatically unlock and reach the folded state regardless of whether the scooter is in a sitting position or a lying position, thereby achieving the purpose of folding the scooter platform with one button. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the baby carriage in Embodiment 1 of the present utility model;

[0023] Figure 2 It is a right side view of the baby carriage in the unfolded state in the first embodiment of the utility model;

[0024] Figure 3 This is a right view of the baby stroller in the folding process in Example 1 of the utility model Figure 1 ;

[0025] Figure 4 This is a right view of the baby stroller in the folding process in Example 1 of the utility model Figure 2 ;

[0026] Figure 5 It is a right side view of the baby carriage in the embodiment 1 of the utility model in the folded and lying state;

[0027] Figure 6 It is a right side view of the baby carriage in the embodiment 1 of the utility model in the folded and standing state;

[0028] Figure 7 It is a structural schematic diagram of the chassis mechanism in Embodiment 1 of the present utility model;

[0029] Figure 8 It is an exploded view of the chassis mechanism in Embodiment 1 of the present utility model;

[0030] Fig. 9 It is an exploded view of the armrest mechanism in Embodiment 1 of the present utility model;

[0031] Fig.10 is a partial cross-sectional view of the baby carriage in Embodiment 1 of the present utility model;

[0032] Fig.11 This is a schematic structural diagram of a baby carriage in a sitting position in Embodiment 2 of the present utility model;

[0033] Fig.12 This is a schematic structural diagram of the baby carriage in Example 2 of the present utility model in a lying position with the foot pedal retracted;

[0034] Fig.13 This is a schematic structural diagram of the baby carriage in Example 2 of the utility model in a lying position with the foot pedal extended;

[0035] Fig.14 is an exploded view of the seat mechanism and the front support leg assembly in Embodiment 2 of the present utility model;

[0036] Fig.15 It is a partial structural schematic diagram of a baby carriage in Embodiment 2 of the present utility model;

[0037] Fig.16 It is a structural schematic diagram of the baby carriage in the sitting position in Example 3 of the utility model.

[0038] In the figure: 1- chassis mechanism, 11- slide rail assembly, 12- sliding block, 13- front wheel assembly, 14- rear wheel assembly, 141- rear connecting rod assembly, 1411- shock absorber seat, 142- rear wheel brake assembly, 1421- rear wheel seat, 143- rear wheel, 144- shock absorber spring;

[0039] 21-front support foot assembly, 211-second cam, 212-support rod, 22-rear support foot assembly, 23-handle assembly;

[0040] 3-armrest mechanism, 31-side pull rod assembly, 311-first cam, 32-armrest assembly, 321-slot, 33-armrest locking assembly, 331-unlocking slider, 3311-inclined surface, 3312-clamping portion;

[0041] 4-seat mechanism, 41-seat plate assembly, 411-installation cavity, 42-backrest assembly, 421-upper backrest, 422-lower backrest, 423-hinge structure, 43-seat cloth assembly, 44-backrest locking assembly, 45-unlocking traction member, 46-backrest unlocking turntable, 47-flexible connecting member;

[0042] 5- Footrest; 6- Storage basket. DETAILED DESCRIPTION

[0043] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific implementation of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed for protection in the present invention.

[0044] Example 1

[0045] refer to Figure 1-6 The present embodiment provides a baby carriage, comprising a chassis mechanism 1, a foldable or unfoldable support mechanism (not shown in the figure) and an armrest mechanism 3, wherein the support mechanism comprises a front support leg assembly 21, a rear support leg assembly 22 and a handle assembly 23, wherein the middle portion of the front support leg assembly 21 is hinged to the middle portion of the rear support leg assembly 22 to form an X shape, the lower end of the front support leg assembly 21 is rotatably connected to the rear end of the chassis mechanism 1, and the lower end of the rear support leg assembly 22 is slidably connected to the chassis mechanism 1, at which time the chassis mechanism 1, the lower end of the front support leg assembly 21 and the lower end of the rear support leg assembly 22 are enclosed together to form a lower triangle, which is enclosed by three sides b2, d and c2, see Figure 2 or 3.

[0046] The lower end of the handle assembly 23 is rotatably connected to the upper end of the rear leg assembly 22, and the front and rear ends of the armrest mechanism 3 are rotatably connected to the upper end of the front leg assembly 21 and the lower end of the handle assembly 23, respectively. In this embodiment, the armrest mechanism 3 itself can also switch between the folded and unfolded states. When the stroller is folded, the bracket mechanism and the armrest mechanism 3 are linked to fold, so that the stroller can be folded with one button; the handle assembly 23 is arranged in a straight line with the rear leg assembly 22 in the unfolded state. At this time, the armrest mechanism 3, the upper end of the front leg assembly 21, the upper end of the rear leg assembly 22, and the lower end of the handle assembly 23 together form an upper triangle, which is formed by the three sides b1, a and c1, see Figure 2 The handle assembly 23 is arranged at an angle with the rear support leg assembly 22 in the folded state. At this time, the armrest mechanism 3, the upper end of the front support leg assembly 21, the upper end of the rear support leg assembly 22, and the lower end of the handle assembly 23 are enclosed together to form an upper quadrilateral or a four-link structure, which is enclosed by four sides f, e, a and c1, see Figure 3 .

[0047] It can be seen that by connecting the foldable or unfoldable bracket mechanism between the base mechanism 1 and the armrest mechanism 3, the baby carriage can be folded or unfolded, and the folding operation is simple. After folding, the baby carriage has a small and neat volume and can stand in two directions (see Figure 5-6 ), and after unfolding, the bracket mechanism, the base frame mechanism and the armrest mechanism together form a double triangle stable support structure (see Figure 1-2 ), thus forming a stable and reliable support, effectively ensuring the reliability of the stroller.

[0048] Furthermore, the rear support leg assembly 22 and the handle assembly 23 are locked or unlocked by the frame locking assembly 24. When the baby stroller is unfolded, the rear support leg assembly 22 and the handle assembly 23 can be locked by the frame locking assembly 24 to achieve self-locking, so that the support mechanism or the baby stroller is stably and reliably maintained in the unfolded state, see Figure 1-2 .

[0049] A frame unlocking assembly (not shown) is provided on any one of the handle assembly 23, the rear support leg assembly 22, the bottom frame mechanism 1 or the armrest mechanism 3, and the frame unlocking assembly is linked with the frame locking assembly 24. When the frame unlocking assembly can drive the frame locking assembly 24 to unlock, the bracket mechanism can be folded, and the operator can release the handle assembly 23 by swinging it forward counterclockwise. The upper triangle of the baby stroller will become an upper quadrilateral or a four-bar structure, and the rear support leg assembly 22 of the lower triangle of the baby stroller will slide on the bottom frame mechanism 1 when the angles of the two sides change, see Figure 3-4 , until the baby stroller is folded or folded. When the stroller is folded, it can be unlocked with one button through the frame unlocking component, and it can be folded under the action of its own weight. After folding, the size is small and neat, and it can stand in both lying and cubic directions. Figure 5-6 .

[0050] After the operator lets go, the handle assembly 23 will continue to fold downward counterclockwise automatically under the action of its own gravity. When the handle assembly 23 rotates counterclockwise to a certain angle, the armrest mechanism 3 is linked to automatically unlock the armrest mechanism 3, and then the armrest mechanism 3 will automatically fold to the folded state under the action of gravity, so as to achieve the purpose of folding the bicycle with one button.

[0051] See also Figure 1 and Figure 7-8 The chassis mechanism 1 includes a rail assembly 11 and a sliding block 12. One end of the sliding block 12 is rotatably connected to the lower end of the rear leg assembly 22. In this embodiment, a connecting shaft (not shown in the figure) extending toward the sliding block 12 is formed at the lower end of the rear leg assembly 22. The upper end of the sliding block 12 is rotatably connected to the connecting shaft of the rear leg assembly 22, and the lower end of the sliding block 12 is slidably connected to the slide groove on the rail assembly 11. In this way, driven by the sliding block 12, the rear leg assembly 22 can slide forward and backward along the length direction of the rail assembly 11. In other embodiments, the lower end of the sliding block 12 can be designed to be slidably sleeved outside the rail assembly 11.

[0052] Furthermore, the chassis mechanism 1 further includes a front wheel assembly 13 and a rear wheel assembly 14, which are respectively provided at the front and rear ends of the slide rail assembly 11, and the lower end of the front support leg assembly 21 is rotatably connected to the left and right ends of the rear wheel assembly 14. In this embodiment, the rear wheel assembly 14 includes a rear connecting rod assembly 141, a rear wheel brake assembly 142 and two rear wheels 143, and the opposite ends of the rear wheel brake assembly 142 are connected to the rear end of the slide rail assembly 11 through the rear connecting rod assembly 141, and the opposite ends of the rear wheel brake assembly 142 are respectively connected to the lower end of the front support leg assembly 21, and the two rear wheels 143 are respectively connected to the left and right ends of the rear wheel brake assembly 142 to realize the braking function of the baby carriage.

[0053] The rear wheel assembly 14 also includes a shock absorbing spring 144, which is provided between the rear link assembly 141 and the rear wheel brake assembly 142 to achieve the shock absorbing function of the rear wheel assembly. In this embodiment, shock absorbing seats 1411 are provided at the left and right ends of the rear link assembly 141, and a rear wheel seat 1421 is provided at the position of the rear wheel brake assembly 142 corresponding to the shock absorbing seat. The rear wheel seat 1421 is respectively connected to the shock absorbing seat 1411, the rear wheel 143 and the lower end of the front support leg assembly 21, and the shock absorbing spring 144 is provided between the rear wheel seat 1421 and the shock absorbing seat 1411.

[0054] See also Figure 1 and Figure 9-10 The armrest mechanism 3 includes two side tie rod assemblies 31 and an armrest assembly 32. The two opposite ends of the two side tie rod assemblies 31 are rotatably connected to the upper end of the front support leg assembly 21 and the lower end of the handle assembly 23, so that the upper end of the front support leg assembly 21 and the lower end of the handle assembly 23 are reliably connected as a whole, which is convenient for strengthening the overall strength of the support mechanism or the baby carriage. The opposite ends of the armrest assembly 32 are hinged to the middle of the two side tie rod assemblies 31, and the armrest assembly 32 can switch between a flat state (i.e., a folded state) and a raised state (i.e., an unfolded state). The flat state is that the armrest assembly 32 is flipped downward to be close to the lower ends of the two side tie rod assemblies 31; the raised state is that the armrest assembly 32 is flipped upward to the front and upper part of the two side tie rod assemblies 31, at which time the armrest assembly 32 is set at an angle with the side tie rod assembly 31, which plays a protective role. It is particularly noted that when folding the car, the armrest mechanism 3 can be folded by the support mechanism, so that the armrest assembly 32 is automatically switched from the raised state to the flat state, thereby achieving the purpose of folding the car with one button.

[0055] Furthermore, the armrest assembly 32 includes a "U"-shaped armrest body and two connecting seats. The opposite ends of the armrest body are rotatably connected to the middle of the two side tie rod assemblies 31 through the two connecting seats. In this embodiment, an armrest quick-release structure is provided between the armrest body and the connecting seats, so that the armrest body can be quickly detached or assembled to the connecting seats. When the armrest body is detached from the connecting seats, it is convenient to place the baby in the unfolded baby carriage. Furthermore, the armrest assembly 32 and the side tie rod assembly 31 are locked or unlocked by the armrest locking assembly 33. When the side tie rod assembly 31 rotates relative to the front support leg assembly 21, the armrest locking assembly 33 can be linked. In this embodiment, when the support mechanism is folded and retracted, when the handle assembly 23 automatically folds downward counterclockwise under the action of its own gravity, and the handle assembly 23 rotates counterclockwise to a certain angle, the side pull rod assembly 31 also rotates to a certain angle relative to the front support leg assembly 21, and the armrest locking assembly 33 is automatically unlocked at this time, so that the armrest assembly 32 is automatically folded to the folded state under the action of gravity. When the vehicle is unfolded, the frame locking assembly 24 is self-locked, and the armrest assembly 32 is lifted upward, and the armrest is self-locked under the action of the armrest locking assembly 33.

[0056] refer to Fig.10 The armrest locking assembly 33 includes an unlocking slider 331 and an elastic member (not shown in the figure). A first cam 311 is provided at the front end of the side tie rod assembly 31, and a second cam 211 is provided at the upper end of the front support leg assembly 21 to cooperate with the first cam. A clamping groove 321 is provided at the position of the armrest assembly 32 corresponding to the side tie rod assembly 31. An elastic member and an unlocking slider 331 that can slide along the length direction of the side tie rod assembly 31 are provided in the side tie rod assembly 31. One end of the unlocking slider 331 is wedge-shapedly matched with the first cam 311, and the other end can be switched between being inserted into the clamping groove 321 and being moved away from the clamping groove 321. The elastic member is connected to or abuts against the unlocking slider 331, so that the unlocking slider 331 always has a tendency to engage with the clamping groove 321.

[0057] In this embodiment, a slope 3311 for wedge-shaped cooperation with the first cam 311 is provided at the front end of the unlocking slider 331, and a clamping portion 3312 is provided at the rear end of the unlocking slider 331, and the clamping portion 3312 selectively cooperates with the clamping slot 321 of the armrest assembly 32. When the armrest assembly is unfolded, the clamping portion 3312 of the unlocking slider 331 is clamped in the clamping slot 32 of the armrest assembly 32; when the side pull rod assembly 31 and the front support leg assembly rotate relative to each other, the unlocking slider 331 will move relative to each other, and when it rotates to a certain angle, the armrest assembly can be unlocked.

[0058] Example 2

[0059] refer to Figure 11-15The difference between this embodiment and the first embodiment is that the baby carriage further includes a seat mechanism 4, which is respectively connected to the upper end of the front support leg assembly 21 and the two side pull rod assemblies 31 of the armrest mechanism 3. The seat mechanism 4 can be switched between a sitting state and a lying state, so that the baby carriage can be used for sitting or lying, ensuring that newborn babies can also use it, thereby improving the practicality and versatility of the product. It is particularly noted that when the carriage is folded, the seat mechanism 3 can be linked and folded, so that the seat mechanism 3 will be automatically unlocked regardless of whether it is in a sitting position or a lying position, and the folded state is achieved, thereby achieving the purpose of folding the carriage platform with one key.

[0060] Furthermore, a support rod 212 is provided at the upper end of the front support leg assembly 21 and is located below the seat mechanism 44. The support rod 212 is connected to or abuts against the front end of the bottom of the seat mechanism 4 to strengthen the overall strength of the front support leg assembly 21 and to reliably support the front end of the bottom of the seat mechanism 4 to improve the installation firmness of the seat mechanism 4. Figure 11-14 The seat mechanism 4 includes a seat plate assembly 41, a backrest assembly 42 and a gear adjustment assembly (not shown in the figure). The front and rear ends of the seat plate assembly 41 are rotatably connected to the upper end of the front support leg assembly 21 and the lower end of the backrest assembly 42, respectively, so that the backrest assembly 42 can rotate relative to the seat plate assembly 41. The gear adjustment assembly is arranged between the backrest assembly 42 and the seat plate assembly 41, and is used to make the backrest assembly 42 reliably suspend at a specific angle to achieve different gears of the backrest assembly 42, effectively meeting the requirements of the baby stroller for sitting or lying. In this embodiment, the gear adjustment assembly can adopt a gear or a latch structure, or other structures.

[0061] In this embodiment, the seat plate assembly 41 is provided with a mounting cavity 411 that opens forward, and a footrest 5 is provided in the mounting cavity 411. The footrest 5 can be moved out of the mounting cavity 411 and retracted into the mounting cavity 411. Thus, a footrest 5 is hidden in the seat plate assembly 41. When the baby needs to support his legs when lying down, the footrest 5 can be pulled forward to unfold the footrest. When the footrest is not needed, it can be pushed back to its original position. In other embodiments, the footrest 5 can be omitted.

[0062] The backrest assembly 42 includes an upper back plate 421 and a lower back plate 422. The lower end of the lower back plate 422 is rotatably connected to the rear end of the seat plate assembly 41, and the upper end of the lower back plate 422 is hinged to the upper back plate 421 through a hinge structure 423 (or a similar structure). In this way, the backrest assembly 42 can be disconnected into two sections by a hinge structure or other similar means, so that when the stroller is folded, the backrest assembly 42 can be folded into two sections to reduce the volume of the stroller.

[0063] refer to Figure 11-13Furthermore, the seat mechanism 4 further includes a seat cloth assembly 43, which is respectively fixed to the seat plate assembly 41 and the two side tie rod assemblies 31 of the armrest mechanism 3. In addition, the seat cloth assembly 43 can also be fixedly connected to the handle assembly 23. In this embodiment, when the baby bed is unfolded, one end of the seat plate assembly 41 is hinged to the upper end of the front leg assembly 21, and the other end is fixed to the two side tie rod assemblies 31 of the armrest mechanism 3 through the seat cloth assembly 43, and the angle between the seat plate assembly 41 and the front leg assembly 21 is maximized, and the seat plate assembly 41 is limited to reach the support rod 212 of the front leg assembly 21, thereby achieving the fixation of the seat plate assembly 41 and improving the stability in use. In addition, during the folding process, the backrest assembly will also be folded under the pull of the seat cloth assembly 43.

[0064] refer to Figure 11-13 Furthermore, a backrest locking assembly 44 is provided between the seat plate assembly 41 and the backrest assembly 42, an unlocking traction member 45 is provided at the bottom of the seat plate assembly 41, and a backrest unlocking turntable 46 is provided at the front end of the side tie rod assembly 31 of the armrest mechanism 3, and the backrest unlocking turntable 46 is connected to the backrest locking assembly 44 through the unlocking traction member 45, so that when the side tie rod assembly rotates a certain angle, the seat plate assembly 41 and the backrest assembly 42 will be automatically unlocked. When the vehicle is unfolded, the frame locking assembly 24 will complete self-locking, lift the armrest assembly 32 upward, and the seat plate assembly 41 and the backrest assembly 42 will also return to their positions and lock themselves under the action of the backrest locking assembly 44.

[0065] In this embodiment, when the baby carriage is folded, the handle assembly 23 automatically folds downward in a counterclockwise direction under the action of its own gravity. When the handle assembly 23 is rotated to a certain angle, the armrest mechanism 3 and the seat mechanism 4 are automatically unlocked, so that the armrest mechanism 3 and the seat mechanism 4 are automatically folded to a folded state under the action of gravity. During the folding process, the backrest assembly 42 is folded under the pull of the seat cloth assembly 43.

[0066] When the vehicle is unfolded, the frame locking assembly 24 will complete self-locking, and the seat plate assembly 41 and the backrest assembly 42 will also return to their positions and self-lock under the action of the backrest locking assembly 44. The armrest assembly 32 is lifted upward, and the seat plate assembly 41 and the backrest assembly 42 will also return to their positions and self-lock under the action of the backrest locking assembly 44.

[0067] Example 3

[0068] refer to Fig.16 The difference between this embodiment and embodiment 1 is that the seat mechanism 4 also includes two flexible connectors 47, and the left and right outer sides of the rear end of the seat plate assembly 41 are respectively connected to the two side tie rod assemblies 31 through the flexible connectors 47. At this time, the seat cloth assembly 43 can be connected to the two side tie rod assemblies 31 or not.

[0069] It can be seen that the rear end of the seat plate assembly 41 is limited and fixed by the flexible connector 47, which is conducive to better saving space, making the baby carriage more compact and lightweight, and reducing production costs.

[0070] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A foldable baby stroller, characterized in that: include: Base frame mechanism (1); A foldable or unfoldable support mechanism, comprising a front support leg assembly (21), a rear support leg assembly (22) and a handle assembly (23), wherein the middle portion of the front support leg assembly (21) is hinged to the middle portion of the rear support leg assembly (22), the lower end of the front support leg assembly (21) is rotatably connected to the rear end of the base frame mechanism (1), the lower end of the rear support leg assembly (22) is slidably connected to the base frame mechanism (1), and the lower end of the handle assembly (23) is rotatably connected to the upper end of the rear support leg assembly (22); and The front and rear ends of the armrest mechanism (3) are rotatably connected to the upper end of the front support leg assembly (21) and the lower end of the handle assembly (23) respectively.

2. A foldable baby stroller according to claim 1, characterized in that: The handle assembly (23) is arranged in a straight line with the rear support leg assembly (22) in the unfolded state, so that the armrest mechanism (3), the upper end of the front support leg assembly (21), the upper end of the rear support leg assembly (22) and the lower end of the handle assembly (23) together form an upper triangle; The handle assembly (23) is arranged at an angle with the rear support leg assembly (22) in a folded state, so that the armrest mechanism (3), the upper end of the front support leg assembly (21), the upper end of the rear support leg assembly (22) and the lower end of the handle assembly (23) are together enclosed to form an upper quadrilateral or a four-link structure.

3. A foldable baby stroller according to claim 1, characterized in that: The armrest mechanism (3) comprises two side tie rod assemblies (31) and an armrest assembly (32), the opposite ends of the two side tie rod assemblies (31) are rotatably connected to the upper end of the front support leg assembly (21) and the lower end of the handle assembly (23), respectively, the opposite ends of the armrest assembly (32) are hinged to the middle parts of the two side tie rod assemblies (31), and the armrest assembly (32) can be switched between a flat state and a raised state.

4. A foldable baby stroller according to claim 3, characterized in that: The armrest assembly (32) and the side pull rod assembly (31) are locked or unlocked via an armrest locking assembly (33), and the side pull rod assembly (31) can be linked to the armrest locking assembly (33) when rotating relative to the front support leg assembly (21).

5. A foldable baby stroller according to claim 4, characterized in that: The armrest locking assembly (33) comprises an unlocking slider (331) and an elastic member. A first cam (311) is provided at the front end of the side pull rod assembly (31). A clamping groove (321) is provided at a position of the armrest assembly (32) corresponding to the side pull rod assembly (31). An elastic member and an unlocking slider (331) that can slide along the length direction of the side pull rod assembly (31) are provided in the side pull rod assembly (31). One end of the unlocking slider (331) is wedge-shapedly matched with the first cam (311), and the other end can be switched between being inserted into the clamping groove (321) and being moved away from the clamping groove (321). The elastic member has a tendency to make the unlocking slider (331) always clamped in the clamping groove (321).

6. The foldable baby stroller according to claim 1, characterized in that: The base frame mechanism (1) comprises a slide rail assembly (11) and a sliding block (12), one end of the sliding block (12) is rotatably connected to the lower end of the rear support leg assembly (22), and the other end of the sliding block (12) can be slidably sleeved outside the slide rail assembly (11) forward and backward, or the other end of the sliding block (12) is slidably connected to a slide groove on the slide rail assembly (11).

7. A foldable baby stroller according to claim 6, characterized in that: A front wheel assembly (13) and a rear wheel assembly (14) are respectively provided at the front and rear ends of the slide rail assembly (11); the rear wheel assembly (14) comprises a rear connecting rod assembly (141), a rear wheel brake assembly (142) and two rear wheels (143); the opposite ends of the rear wheel brake assembly (142) are connected to the rear end of the slide rail assembly (11) through the rear connecting rod assembly (141); and the two rear wheels (143) are respectively connected to the left and right ends of the rear wheel brake assembly (142).

8. A foldable baby stroller according to any one of claims 1 to 7, characterized in that: The device also comprises a seat mechanism (4), wherein the seat mechanism (4) is respectively connected to the upper end of the front support leg assembly (21) and the two side pull rod assemblies (31) of the armrest mechanism (3); the seat mechanism (4) can be switched between a sitting state and a lying state; and when the support mechanism is folded, the seat mechanism (4) can be linked to be folded.

9. A foldable baby stroller according to claim 8, characterized in that: The seat mechanism (4) comprises a seat plate assembly (41), a backrest assembly (42) and a gear adjustment assembly. The front and rear ends of the seat plate assembly (41) are rotatably connected to the upper end of the front support leg assembly (21) and the lower end of the backrest assembly (42), respectively. The gear adjustment assembly is arranged between the backrest assembly (42) and the seat plate assembly (41) and is used to enable the backrest assembly (42) to reliably hover at a specific angle.

10. A foldable baby stroller according to claim 9, characterized in that: The backrest assembly (42) comprises an upper back plate (421) and a lower back plate (422), and the upper and lower ends of the lower back plate (422) are rotatably connected to the upper back plate (421) and the rear end of the seat plate assembly (41) respectively.

11. The foldable baby stroller according to claim 9, characterized in that: The seat mechanism (4) further comprises a seat cloth assembly (43) and / or a flexible connector (47), wherein the seat cloth assembly (43) is respectively fixed to the seat plate assembly (41) and the two side tie rod assemblies (31) of the armrest mechanism (3), and the left and right outer sides of the rear end of the seat plate assembly (41) are respectively connected to the two side tie rod assemblies (31) via the flexible connector (47).

12. The foldable baby stroller according to claim 9, characterized in that: A backrest locking assembly (44) is provided between the seat plate assembly (41) and the backrest assembly (42); an unlocking traction member (45) is provided at the bottom of the seat plate assembly (41); a backrest unlocking turntable (46) is provided at the front end of the side pull rod assembly (31) of the armrest mechanism (3); and the backrest unlocking turntable (46) is connected to the backrest locking assembly (44) via the unlocking traction member (45).

13. The foldable baby stroller according to claim 9, characterized in that: The seat plate assembly (41) is provided with a mounting cavity (411) which is open toward the front, and a foot pedal (5) is provided in the mounting cavity (411). The foot pedal (5) can be extended out of the mounting cavity (411) and retracted into the mounting cavity (411).

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