Baby carriage frame

Abstract

The utility model belongs to the field of baby strollers, and particularly relates to a baby carriage frame. The baby carriage frame comprises a base, a frame front foot, a frame rear foot, a frame connecting handrail and a seat, and is characterized in that the upper end of the frame front foot is rotationally hinged to the base, the upper end of the frame rear foot is fixedly connected to the base, and the lower end of the frame handle is rotationally hinged to the base; a rear seat plate of the seat is connected to the base through a shaft or a shaft assembly and can rotate relative to the base, and a transmission connecting rod mechanism used for achieving synchronous linkage folding of the frame front foot, the frame rear foot and the frame handle is arranged among the frame front foot, the frame rear foot and the frame handle. The relative position of the rear seat plate and the rear foot of the frame is changed by improving the connecting structure of the rear seat plate and the rear foot of the frame, and enough space is reserved for the folded backrest in the vertical direction, so that the length of the backrest is increased, and the comfort level is improved.

Description

Technical Field

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

[0002] Foldable baby strollers are easy to transport and carry, providing convenience for babies when traveling. Usually, the structural dimensions of the seat, armrests, backrest and other components of the baby stroller and the specifications and dimensions of the whole stroller after folding affect and restrict each other. For example, the backrest generally has both the function of leaning and lying flat. A backrest with sufficient length is conducive to improving comfort, but a backrest that is too long can easily lead to poor folding effect or too large folded volume.

[0003] For example, CN212766425U discloses a foldable baby carriage frame, in which the rear seat plate is fixed to the upper end of the rear support rod. After being fully folded, the rear seat plate is relatively tilted and fixed to the upper end of the rear support rod. Combined with the attached drawings, it can be seen that the length of the backrest is limited by the length of the rear support rod (i.e., the height of the vehicle body after folding); otherwise, if the length of the backrest is increased, the length of the rear support rod must be increased at the same time, and the height of the entire frame must be increased. During the use of a baby carriage or a stroller, a backrest of sufficient length can improve the comfort of leaning or lying flat, and can also expand the applicable height.

[0004] At present, the length of the integrated backrest in baby strollers is usually about 430 mm. As the height of the baby grows, the head is higher than the backrest, which makes it uncomfortable to lean on. For this reason, some baby strollers add additional head support above the backrest, or set the backrest in two sections so that the backrest can be folded when the baby stroller is folded. However, the two-section backrest will have a relatively obvious discontinuity or uneven feeling when lying flat, which affects comfort and even affects the development of the spine. Summary of the invention

[0005] The utility model mainly aims at the problem of mutual restraint between the backrest and the whole stroller of the existing baby stroller when folding, and invents a baby stroller frame. By improving the connection structure between the rear seat plate and the rear legs of the frame, the relative positions of the two after folding are changed, that is, the position of the rear seat plate is lifted upward, and then sufficient space is reserved in the vertical direction for the folded backrest, so that the length of the backrest is basically equal to the length of the rear legs of the frame, the length of the backrest is increased, and the comfort is improved.

[0006] The invention objective of the utility model is achieved through the following technical scheme: a baby carriage frame, comprising a base located in the middle, a frame front foot connected to the base and located obliquely in front of the base, a frame rear foot connected to the base and located obliquely behind the base, a frame handle connected to the base and located obliquely above the base, and a seat arranged in the middle of the frame, the seat comprising a rear seat plate, a front seat plate hinged to the front side of the rear seat plate, and a backrest arranged behind the rear seat plate, characterized in that the upper ends of the frame front feet are rotatably hinged to the base, the upper ends of the frame rear feet are fixedly connected to the base, and the lower ends of the frame handles are rotatably hinged to the base; the rear seat plate of the seat is connected to the base by an axis or an axis assembly and the rear seat plate can rotate relative to the base, and a short connecting rod is hinged between the front seat plate of the seat and the upper parts of the frame front feet.

[0007] A transmission link mechanism for realizing synchronous linkage folding of the three is arranged between the front foot of the frame, the rear foot of the frame and the handle of the frame.

[0008] The front foot, rear foot and handlebar of the frame are roughly radial, and the inner ends intersect at the base in the middle; the rear foot of the frame is fixed to the base and relatively static, that is, when folded, the rear foot of the frame and the base move synchronously; the front foot of the frame and the handlebar of the frame are hinged to the base and can rotate with the hinge point on the base as the rotation center; at the same time, the handlebar of the frame is hinged up and down by the upper handlebar of the frame and the lower handlebar of the frame, and a locking control device is provided between the upper handlebar of the frame and the lower handlebar of the frame; when unlocked, the upper handlebar of the frame and The lower handlebar of the frame can be folded in half relative to each other; when folding, the front foot of the frame rotates toward the rear foot of the frame, and the upper handlebar of the frame and the lower handlebar of the frame are folded in half and rotated downward toward the rear foot of the frame as a whole, until the three are close to each other and the rear foot of the frame is in a vertical position; and because the seat is a three-fold structure, the rear part of the rear seat plate is also hinged to the base, so when folding, the rear seat plate can be rotated relative to the base to a position approximately perpendicular to the base (or the rear foot of the frame), and at the same time, the front seat plate is approximately perpendicular to the rear seat plate, and the calf rest is also approximately vertically downward.

[0009] The backrest is hinged to the rear end of the rear seat plate. When folded, the backrest flips downward and moves closer to the rear foot of the frame. Since the rear seat plate is above the rear foot of the frame after folding, the accommodating space of the backrest can extend downward from the upper end of the rear foot of the frame. The maximum length of the backrest can be set to be the sum of the length of the rear foot of the frame and the height of the wheel. This provides conditions for increasing the length of the backrest.

[0010] Preferably, the base is composed of two symmetrical bases, and the rear seat plate is hinged between the two bases through an axis. In order to improve the overall stability of the frame, a fixed axis is usually added between the two symmetrical bases; the rear seat plate can be directly hinged to the inner side of the base through a shorter axis, and the shorter axis is completely independent of the fixed axis.

[0011] Preferably, the base is composed of two symmetrical bases, and the rear seat plate is hinged between the two bases through an axis assembly; the axis assembly includes a fixed shaft fixedly connected to the two bases, a shaft sleeve connected to the fixed shaft by a ring sleeve, and the shaft sleeve is fixedly connected to the rear seat plate; thereby realizing the rear seat plate being relatively hinged to the base.

[0012] In order to further simplify the structure, the hinge point between the front foot of the frame and the base, and the intersection point between the rear seat plate and the base can be simultaneously set at the position where the above-mentioned fixed shaft and the base are connected, that is, the three are coaxial.

[0013] Preferably, a seat plate support member for supporting the rear seat plate and limiting the rotation range of the rear seat plate is provided on the inner side of the base; when the frame is in the unfolded state, the rear seat plate and the seat plate support member are in contact with each other.

[0014] When in the unfolded state, the rear legs of the frame are tilted downward and the rear seat plate is roughly horizontal. At this time, in order to stabilize the rear seat plate and keep it in a roughly horizontal position, a seat plate support is fixed on the inner side of the base and at a position corresponding to the bottom of the rear seat plate, and the rear seat plate is placed on the seat plate support.

[0015] Preferably, the frame handle comprises an upper frame handle and a lower frame handle, wherein the lower end of the lower frame handle is hinged to the base, and the lower middle part of the upper frame handle is hinged to the upper end of the lower frame handle; a locking device is provided between the upper frame handle and the lower frame handle for realizing locking and unlocking of the two.

[0016] Preferably, the transmission link mechanism includes a first link, a second link, a third link, and a sliding member; the upper end of the first link is rotatably hinged to the lower end of the handlebar on the frame, the lower end of the first link is hinged to the sliding member, the front end of the second link is hinged to the front foot of the frame, the rear end of the second link is hinged to the front end of the third link, the rear end of the third link is hinged to the rear foot of the frame, and the sliding member is slidably sleeved on the third link.

[0017] When the frame is in an unfolded state, the frame handle, the frame front foot, the first connecting rod, the second connecting rod and the third connecting rod form a stable triangular structure; the front seat plate, the rear seat plate, the short connecting rod and the frame front foot form a stable triangular structure.

[0018] When the frame is folded, the locking control device is first operated to release the lock between the upper handlebar of the frame and the lower handlebar of the frame, and the upper handlebar of the frame is pushed forward, so that the upper handlebar of the frame and the lower handlebar of the frame are folded in half and turned downward; in the process of folding the upper handlebar of the frame and the lower handlebar of the frame and turning downward, the first connecting rod is driven to turn downward, and the first connecting rod simultaneously drives the sliding assembly, the second connecting rod, and the third connecting rod to perform corresponding sliding and turning actions; on the contrary, when the frame is unfolded, the upper handlebar armrest of the frame is first lifted upward, so that the folded upper handlebar and the lower handlebar assembly of the frame are gradually unfolded, and then the first connecting rod is driven to turn upward, and at the same time, the second connecting rod and the third connecting rod are driven to unfold and support between the front foot of the frame and the rear foot of the frame, and the first connecting rod and the sliding member are unfolded and located between the rear foot of the frame and the frame handlebar; when the frame handlebar and the base are re-locked, the relative positions of the first connecting rod, the second connecting rod, the third connecting rod, and the sliding member are kept stable, and the entire frame is stably unfolded.

[0019] Preferably, a seat armrest is provided above the seat and connected to the base; the seat armrest is U-shaped, and the ends of the side rods on both sides of the seat armrest are connected to the base; the axial direction of the side rods on both sides of the seat armrest is parallel to the axial direction of the rear feet of the frame.

[0020] The seat armrest is relatively fixed to the base. Since the axial direction of the side rod of the seat armrest is parallel to the axial direction of the rear foot of the frame, after the frame is folded, the seat armrest can be flipped from the inclined position along with the base to a roughly vertical upward position (the rear foot of the frame is roughly vertical downward), and used as a handle after the frame is folded.

[0021] Preferably, the seat armrest is U-shaped, and the side rods on both sides of the seat armrest extend toward the direction of the lower handlebar of the frame and the first connecting rod. The side rods on both sides of the seat armrest are first hinged to the lower handlebar of the frame, and the ends of the side rods on both sides of the seat armrest are hinged to a bent connecting rod, and the lower end of the bent connecting rod is hinged to the first connecting rod; in the folded state, the axial direction of the side rods on both sides of the seat armrest is parallel to the axial direction of the rear foot of the frame and the seat armrest and the rear foot of the frame are in opposite directions.

[0022] When the frame is unfolded, the first connecting rod and the lower handle of the frame are relatively stable, and the side rods on both sides of the seat armrest, the bent connecting rod, the first connecting rod, and the lower handle of the frame form a stable triangular structure; when the frame is folded, the first connecting rod and the lower handle of the frame approach each other and flip downward at the same time, driving the seat armrest to flip upward as a whole, and at the same time, the bent connecting rod flips upward relative to the first connecting rod. Finally, the seat armrest is in a roughly vertical upward position (the rear foot of the frame is roughly vertical downward), and is used as a handle after the frame is folded.

[0023] Preferably, a transverse axis is connected between the side bars on both sides of the front foot of the frame, and the lower end of the short connecting rod is hinged to the transverse axis; a transverse rod is connected between the side bars on both sides of the rear foot of the frame. Adding a transverse axis is conducive to improving the stability of the frame, and the lower end of the short connecting rod used to support the front seat plate of the seat can be hinged to the transverse axis or directly hinged to the front foot of the frame.

[0024] The utility model also proposes a baby stroller, comprising the above-mentioned baby stroller frame, characterized in that a sunshade is arranged on the handle of the frame, a front wheel is arranged at the lower end of the front foot of the frame, and a rear wheel is arranged at the lower end of the rear foot of the frame.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] The baby carriage frame proposed by the utility model changes the relative positions of the rear seat plate and the rear legs of the frame after folding by improving the connection structure between the rear seat plate and the rear legs of the frame, that is, the position of the rear seat plate is lifted upward, thereby leaving enough space in the vertical direction for the folded backrest, so that the length of the backrest is basically equal to the length of the rear legs of the frame, the length of the backrest is increased, and the comfort is improved; through the cooperation of the locking control device and the transmission connecting rod, one-step linkage folding is realized.

[0027] The baby stroller proposed by the utility model has a frame in which the relative positions of the rear seat plate and the rear legs of the frame are changed after folding, that is, the position of the rear seat plate is lifted upward, thereby leaving enough space in the vertical direction for the folded backrest, so that the length of the backrest is basically equal to the length of the rear legs of the frame, the length of the backrest is increased, and the comfort is improved; through the cooperation of the locking control device and the transmission connecting rod, one-step linkage folding is realized; and after the whole stroller is folded, the components are compact and the overall shape is more square and regular, which is convenient for transportation and carrying. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a baby stroller frame of the present utility model;

[0029] Figure 2 It is a side view (partial cross-section) of the baby carriage frame of the present invention;

[0030] Figure 3 for Figure 2 An enlarged view of a partial cross-sectional view;

[0031] Figure 4 It is a side view of the utility model in a folded state;

[0032] Figure 5 It is a schematic diagram of the folded state of the utility model.

[0033] Figure 6It is a schematic diagram of another embodiment of the seat armrest of the utility model.

[0034] Figure 7 This is a schematic diagram of a folded state of another embodiment of the present invention.

[0035] Markings in the figure: 1, front foot of the frame; 10, base; 11, short connecting rod; 12, horizontal axis; 13, front wheel

[0036] 2. Rear foot of frame; 21. Crossbar; 22. Rear wheel; 3. Frame handle; 31. Upper handle of frame; 32. Lower handle of frame; 33. Locking device;

[0037] 4. Seat; 41. Rear seat plate; 42. Front seat plate; 43. Calf support; 44. Backrest; 45. Seat armrest; 46. Bending connecting rod; 47. Extension rod;

[0038] 5. shaft assembly; 51. fixed shaft; 52. shaft sleeve; 53. seat plate support;

[0039] 6. Transmission connecting rod mechanism; 61. First connecting rod; 62. Second connecting rod; 63. Third connecting rod; 64. Sliding member. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0041] Embodiment 1:

[0042] like Figure 1 , 2 As shown, a baby stroller frame is mainly composed of a base 10, a frame front leg 1, a frame rear leg 2, a frame handle 3, a seat 4, etc. The frame front leg 1, the frame rear leg 2, and the frame handle 3 are roughly radially distributed with the base 10 as the center.

[0043] Among them, the base 10 is located in the middle of the frame, and the base 10 is composed of two parallel and symmetrical bases 10, each base 10 has three connection ends that are dispersed and oriented in different directions; the upper end of the front foot 1 of the frame is rotatably hinged to the base 10 through an axis and is located obliquely in front of the base 10, the upper end of the rear foot 2 of the frame is fixedly connected to the base 10 and is located obliquely behind the base 10, and the lower end of the frame handle 3 is rotatably hinged to the base 10 and is located obliquely above the base 10.

[0044] The frame handle 3 is composed of an upper frame handle 31 and a lower frame handle 32, wherein the lower end of the lower frame handle 32 is hinged to the base 10, and the lower middle part of the upper frame handle 31 is hinged to the upper end of the lower frame handle 32; a locking control device 33 for realizing locking and unlocking of the upper frame handle 31 and the lower frame handle 32 is provided between the upper frame handle 31 and the lower frame handle 32.

[0045] The seat 4 is connected to the base 10. Specifically, the seat 4 is composed of a rear seat plate 41, a front seat plate 42, a calf rest 43, and a backrest 44 from back to front, and the front seat plate 42 is hinged to the rear seat plate 41, the calf rest 43 is hinged to the front seat plate 42, and the backrest 44 is hinged to the rear seat plate 41.

[0046] Alternatively, the backrest 44 may be directly connected to a tarpaulin, the upper portion of which serves as a sunshade, and the lower portion of which is fixed to the backrest, and the tarpaulin may be tightened and prevented from loosening by straps, thereby adjusting the inclination angle of the backrest, such as tilting or laying flat.

[0047] like Figure 3 As shown, the rear seat plate 41 is rotatably hinged to the base 10 via an axis assembly 5, and the axis assembly 5 is composed of a fixed axis 51 and two sleeves 52 connected to the fixed axis 51 by an annular sleeve, wherein the fixed axis 51 is connected between two symmetrical bases 10, and the middle part of the bottom surface of the rear seat plate 41 is fixedly connected to the two sleeves 52.

[0048] In order to simplify the frame structure, the hinged portion between the upper end of the front leg 1 of the frame and the base 10 is the connection portion between the fixed shaft 51 and the base 10, that is, the front leg 1 of the frame is hinged to the end of the fixed shaft 51; the two shaft sleeves 52 are respectively close to the corresponding bases 10.

[0049] A seat support 53 is fixed to the inner side of the base 10 and corresponding to the bottom of the rear seat plate 41. The rear seat support 53 is used to limit the rotation range of the rear seat plate 41 and support the rear seat plate 41 from bottom to top so that it is roughly in a horizontal position; when the frame is in the unfolded state, the seat support 53 is located below the rear seat plate 41, and the two are in conflict with each other.

[0050] A group of short links 11 are hinged between the front seat plate 42 and the upper part of the front foot 1 of the frame; the short links 11 mainly support the front seat plate 42 when the frame is unfolded, and another function is to guide the flipping direction of the front seat plate 42 and fold it into place when the frame is folded. Specifically, a transverse axis 12 is connected between the side rods on both sides of the front foot 1 of the frame, the upper end of the short links 11 is hinged to the front seat plate 42, and the lower end of the short links 11 is hinged to the transverse axis 12.

[0051] A cross bar 21 is connected between the side bars on both sides of the frame rear foot 2 to improve the firmness of the frame rear foot 2.

[0052] A transmission link mechanism 6 for realizing synchronous linkage folding of the three is arranged between the front frame foot 1 , the rear frame foot 2 , and the frame handle 3 . The transmission link mechanism 6 is composed of a first link 61 , a second link 62 , a third link 63 , and a sliding member 64 .

[0053] Among them, the upper end of the first connecting rod 61 is rotatably hinged to the lower end of the handlebar 31 on the frame, and the lower end of the first connecting rod 61 is hinged to the upper end of the sliding member 64; the front end of the second connecting rod 62 is hinged to the front foot 1 of the frame, the rear end of the second connecting rod 62 is hinged to the front end of the third connecting rod 63, the rear end of the third connecting rod 63 is hinged to the rear foot 2 of the frame, and the lower part of the sliding member 64 is slidably sleeved on the third connecting rod 63.

[0054] In order to improve the smoothness of the movement of the transmission connecting rod assembly during rotation and folding, the ends of the first connecting rod, the second connecting rod and the third connecting rod are all configured to be slightly bent and raised.

[0055] A U-shaped seat armrest 45 is installed above the seat 4, and both ends of the seat armrest 45 are fixedly connected to the base 10 and close to the frame handle 3; the axial direction of the side rods on both sides of the seat armrest 3 is parallel to the axial direction of the frame rear foot 2.

[0056] like Figure 4 , 5 In the folded state shown, the folding process is as follows: the lock between the upper handle 31 of the frame and the lower handle 32 of the frame is released, and the upper handle 31 of the frame is slightly pushed forward, so that the upper handle 31 of the frame and the lower handle 32 of the frame are folded in half relative to each other and turned downward as a whole; thereby driving the first connecting rod 61 to turn downward, and at the same time the sliding member 64 slides forward, and the second connecting rod 62 and the third connecting rod 63 are relatively folded and turned, guiding the front foot 1 of the frame to approach the rear foot 2 of the frame, and at the same time, the short connecting rod 11 drives the front seat plate 42 to turn downward, and then drives the rear seat plate 41 to turn relative to the base 10 to be perpendicular to the rear foot 2 of the frame, and driven by the frame handle 3, the backrest 44 is also synchronously turned downward to be roughly parallel to the rear foot 2 of the frame; the seat armrest 45 is turned upward as a handle with the base 10, and the remaining components are all close to the rear foot 2 of the frame.

[0057] Embodiment 2:

[0058] like Figure 6 , 7 As shown, compared with Example 1, the difference of this embodiment is that the seat armrest 45 is U-shaped, and the side rods on both sides of the seat armrest 45 extend toward the direction of the lower handlebar 32 of the frame and the first connecting rod 61 until they are connected to the two. Due to the long extension distance, the side rods of the seat armrest 45 are actually provided with an extension rod 47; specifically, the side rods on both sides of the seat armrest 45 are detachably connected to the extension rod 47, and the detachable connection structure can adopt a snap-on press disassembly and connection structure. The extension rod 47 is first hinged to the lower handlebar 32 of the frame and close to the base 10 through a short shaft or a pin shaft, and the end of the extension rod 47 is hinged to a bent connecting rod 46, which is an inverted L-shape, with its upper end hinged to the end of the extension rod 47, and its lower end hinged to the middle and lower part of the first connecting rod 32.

[0059] In the folded state, the axial directions of the side rods on both sides of the seat armrest 45 are parallel to the axial directions of the rear legs 2 of the frame, and the seat armrest 45 and the rear legs 2 of the frame are in opposite directions.

[0060] When the frame is unfolded, the first connecting rod 61 and the lower handle 32 of the frame are relatively stable, and the side rods on both sides of the seat armrest 45, the bent connecting rod 46, the first connecting rod 61, and the lower handle 32 of the frame form a stable triangular structure; when the frame is folded, the first connecting rod 61 and the lower handle 32 of the frame are close to each other and flipped downward at the same time, driving the seat armrest 45 to flip upward as a whole, and at the same time, the bent connecting rod 46 flips upward relative to the first connecting rod 61. Finally, the seat armrest 45 is in a roughly vertical upward position, and is used as a handle after the frame is folded.

[0061] Embodiment 3:

[0062] Compared with embodiments 1 and 2, the difference of this embodiment is that the hinged part between the upper end of the front leg 1 of the frame and the base 10 and the hinged part between the rear seat plate 41 and the base 10 are not in the same position, and the latter is located obliquely above the former.

[0063] The upper end of the front leg 1 of the frame is hinged to the base 10 via a short axis.

[0064] The rear seat plate 41 is rotatably hinged to the base 10 via an axis assembly 5, and the axis assembly 5 is composed of a fixed axis 51 and two sleeves 52 connected to the fixed axis 51 by an annular sleeve, wherein the fixed axis 51 is connected between two symmetrical bases 10, and the middle part of the bottom surface of the rear seat plate 41 is fixedly connected to the two sleeves 52.

[0065] Embodiment 4:

[0066] Compared with embodiments 1 and 2, the difference of this embodiment is that the hinged part between the upper end of the front leg 1 of the frame and the base 10 and the hinged part between the rear seat plate 41 and the base 10 are not in the same position, and the latter is located obliquely above the former.

[0067] Both sides of the rear seat plate 41 are correspondingly hinged to the base 10 through short shafts, and a limit assembly for limiting the rotation range of the rear seat plate 41 is provided between the rear seat plate 41 and the base 10 .

[0068] The limiting assembly is composed of a first limiting member 53 and a second limiting member 54, wherein the second limiting member 54 is configured as a relatively protruding protrusion on the inner side of the base 10, and the first limiting member 53 is configured as an extension portion with one end fixed to the rear seat plate 41 and extending toward the second limiting member 54; when the frame is in the unfolded state, the end of the first limiting member 53 can be placed on the second limiting member 54 and form a conflict or mutual engagement, so that the rear seat plate 41 is stably in a horizontal position.

[0069] A fixed shaft 51 is connected between the two symmetrical bases 10 , and the upper end of the front leg 1 of the frame is hinged to the end of the fixed shaft 51 .

[0070] Embodiment 5:

[0071] A baby stroller adopts the baby stroller frame as described in Examples 1-4, with a sunshade installed on the frame handle 3, a front wheel 13 installed at the lower end of the front leg 1 of the frame, and a rear wheel 22 installed at the lower end of the rear leg 2 of the frame.

[0072] The awning's tarpaulin extends downward to the backrest 44 and covers the entire outer side of the backrest. The angle adjustment and lying state of the backrest 44 are achieved by straps with buckles arranged on the outer side of the awning.

[0073] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A baby carriage frame, comprising a base (10) located in the middle, a front frame foot (1) connected to the base and located obliquely in front of the base, a rear frame foot (2) connected to the base and located obliquely behind the base, a frame handle (3) connected to the base and located obliquely above the base, and a seat (4) arranged in the middle of the frame, the seat (4) comprising a rear seat plate (41), a front seat plate (42) hinged to the front side of the rear seat plate, and a backrest (44) arranged behind the rear seat plate (41), characterized in that: The upper end of the front foot (1) of the frame is rotatably hinged to the base (10), the upper end of the rear foot (2) of the frame is fixedly connected to the base (10), and the lower end of the frame handle (3) is rotatably hinged to the base (10); the rear seat plate (41) of the seat (4) is connected to the base (10) via an axle or an axle assembly (5) and the rear seat plate (41) is rotatable relative to the base (10), and a short connecting rod (11) is hinged between the front seat plate (42) of the seat (4) and the upper part of the front foot (1) of the frame; A transmission link mechanism (6) for realizing synchronous linkage folding of the three is arranged between the front foot (1) of the frame, the rear foot (2) of the frame and the handlebar (3).

2. The baby carriage frame according to claim 1, characterized in that: The base (10) is composed of two symmetrical bases, and the rear seat plate (41) is rotatably hinged between the two bases (10) via an axis.

3. The baby carriage frame according to claim 1, characterized in that: The base (10) is composed of two symmetrical bases, and the rear seat plate (41) is hinged between the two bases (10) via an axis assembly; The shaft assembly (5) comprises a fixed shaft (51) fixedly connected to the two bases (10), and a shaft sleeve (52) annularly connected to the fixed shaft (51); the shaft sleeve (52) is fixedly connected to the rear seat plate (41).

4. The baby carriage frame according to claim 2 or 3, characterized in that: A seat plate support (53) for supporting a rear seat plate (41) and limiting the rotation range of the rear seat plate (41) is arranged on the inner side of the base (10); when the frame is in an unfolded state, the rear seat plate (41) and the seat plate support (53) are in contact with each other.

5. The baby stroller frame according to claim 1, characterized in that: The frame handle (3) comprises an upper frame handle (31) and a lower frame handle (32), wherein the lower end of the lower frame handle (32) is hinged to the base (10), and the lower middle portion of the upper frame handle (31) is hinged to the upper end of the lower frame handle (32); A locking device (33) is provided between the upper handlebar (31) of the frame and the lower handlebar (32) of the frame.

6. The baby carriage frame according to claim 5, characterized in that: The transmission link mechanism (6) comprises a first link (61), a second link (62), a third link (63), and a sliding member (64); the upper end of the first link (61) is rotatably hinged to the lower end of the handlebar (31) on the frame, the lower end of the first link (61) is hinged to the sliding member (64), the front end of the second link (62) is hinged to the front foot (1) of the frame, the rear end of the second link (62) is hinged to the front end of the third link (63), the rear end of the third link (63) is hinged to the rear foot (2) of the frame, and the sliding member (64) is slidably sleeved on the third link (63).

7. The baby carriage frame according to claim 4, characterized in that: A seat armrest (45) is arranged above the seat, and the seat armrest (45) is connected to the base (10); the seat armrest (45) is U-shaped, and the side rod ends on both sides of the seat armrest are connected to the base.

8. The baby carriage frame according to claim 4, characterized in that: A seat armrest (45) is arranged above the seat. The seat armrest (45) is U-shaped, and side rods on both sides of the seat armrest (45) extend in the direction of the lower handlebar (32) of the frame and the first connecting rod (61). The side rods on both sides of the seat armrest (45) are first hinged to the lower handlebar (32) of the frame, and the ends of the side rods on both sides of the seat armrest (45) are hinged to a bent connecting rod (46), and the lower end of the bent connecting rod (46) is hinged to the first connecting rod (61).

9. The baby stroller frame according to claim 1, characterized in that: A transverse axis (12) is connected between the side bars on both sides of the front foot (1) of the frame, and the lower end of the short connecting rod (11) is hinged to the transverse axis (12); and a transverse rod (21) is connected between the side bars on both sides of the rear foot (2) of the frame.

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